Commit | Line | Data |
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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 LT |
3 | * (C) Copyright IBM Corp. 2001, 2004 |
4 | * Copyright (c) 1999-2000 Cisco, Inc. | |
5 | * Copyright (c) 1999-2001 Motorola, Inc. | |
6 | * Copyright (c) 2001-2002 Intel Corp. | |
7 | * Copyright (c) 2002 Nokia Corp. | |
8 | * | |
60c778b2 | 9 | * This is part of the SCTP Linux Kernel Implementation. |
1da177e4 LT |
10 | * |
11 | * These are the state functions for the state machine. | |
12 | * | |
1da177e4 LT |
13 | * Please send any bug reports or fixes you make to the |
14 | * email address(es): | |
91705c61 | 15 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 16 | * |
1da177e4 LT |
17 | * Written or modified by: |
18 | * La Monte H.P. Yarroll <piggy@acm.org> | |
19 | * Karl Knutson <karl@athena.chicago.il.us> | |
20 | * Mathew Kotowsky <kotowsky@sctp.org> | |
21 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
22 | * Jon Grimm <jgrimm@us.ibm.com> | |
23 | * Hui Huang <hui.huang@nokia.com> | |
24 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
25 | * Daisy Chang <daisyc@us.ibm.com> | |
26 | * Ardelle Fan <ardelle.fan@intel.com> | |
27 | * Ryan Layer <rmlayer@us.ibm.com> | |
28 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
29 | */ |
30 | ||
145ce502 JP |
31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
32 | ||
1da177e4 LT |
33 | #include <linux/types.h> |
34 | #include <linux/kernel.h> | |
35 | #include <linux/ip.h> | |
36 | #include <linux/ipv6.h> | |
37 | #include <linux/net.h> | |
38 | #include <linux/inet.h> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | #include <net/sock.h> |
41 | #include <net/inet_ecn.h> | |
42 | #include <linux/skbuff.h> | |
43 | #include <net/sctp/sctp.h> | |
44 | #include <net/sctp/sm.h> | |
45 | #include <net/sctp/structs.h> | |
46 | ||
103d750c MH |
47 | #define CREATE_TRACE_POINTS |
48 | #include <trace/events/sctp.h> | |
49 | ||
172a1599 XL |
50 | static struct sctp_packet *sctp_abort_pkt_new( |
51 | struct net *net, | |
52 | const struct sctp_endpoint *ep, | |
53 | const struct sctp_association *asoc, | |
54 | struct sctp_chunk *chunk, | |
55 | const void *payload, size_t paylen); | |
1da177e4 LT |
56 | static int sctp_eat_data(const struct sctp_association *asoc, |
57 | struct sctp_chunk *chunk, | |
a85bbeb2 | 58 | struct sctp_cmd_seq *commands); |
172a1599 XL |
59 | static struct sctp_packet *sctp_ootb_pkt_new( |
60 | struct net *net, | |
61 | const struct sctp_association *asoc, | |
62 | const struct sctp_chunk *chunk); | |
24cb81a6 EB |
63 | static void sctp_send_stale_cookie_err(struct net *net, |
64 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
65 | const struct sctp_association *asoc, |
66 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 67 | struct sctp_cmd_seq *commands, |
1da177e4 | 68 | struct sctp_chunk *err_chunk); |
172a1599 XL |
69 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
70 | struct net *net, | |
71 | const struct sctp_endpoint *ep, | |
72 | const struct sctp_association *asoc, | |
73 | const union sctp_subtype type, | |
74 | void *arg, | |
75 | struct sctp_cmd_seq *commands); | |
76 | static enum sctp_disposition sctp_sf_shut_8_4_5( | |
77 | struct net *net, | |
78 | const struct sctp_endpoint *ep, | |
79 | const struct sctp_association *asoc, | |
80 | const union sctp_subtype type, | |
81 | void *arg, | |
82 | struct sctp_cmd_seq *commands); | |
83 | static enum sctp_disposition sctp_sf_tabort_8_4_8( | |
84 | struct net *net, | |
24cb81a6 | 85 | const struct sctp_endpoint *ep, |
ece25dfa | 86 | const struct sctp_association *asoc, |
bfc6f827 | 87 | const union sctp_subtype type, |
ece25dfa | 88 | void *arg, |
a85bbeb2 | 89 | struct sctp_cmd_seq *commands); |
1c16a186 XL |
90 | static enum sctp_disposition sctp_sf_new_encap_port( |
91 | struct net *net, | |
92 | const struct sctp_endpoint *ep, | |
93 | const struct sctp_association *asoc, | |
94 | const union sctp_subtype type, | |
95 | void *arg, | |
96 | struct sctp_cmd_seq *commands); | |
1da177e4 LT |
97 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk); |
98 | ||
172a1599 XL |
99 | static enum sctp_disposition sctp_stop_t1_and_abort( |
100 | struct net *net, | |
101 | struct sctp_cmd_seq *commands, | |
102 | __be16 error, int sk_err, | |
103 | const struct sctp_association *asoc, | |
104 | struct sctp_transport *transport); | |
52c1da39 | 105 | |
172a1599 XL |
106 | static enum sctp_disposition sctp_sf_abort_violation( |
107 | struct net *net, | |
108 | const struct sctp_endpoint *ep, | |
109 | const struct sctp_association *asoc, | |
110 | void *arg, | |
111 | struct sctp_cmd_seq *commands, | |
112 | const __u8 *payload, | |
113 | const size_t paylen); | |
aecedeab | 114 | |
172a1599 XL |
115 | static enum sctp_disposition sctp_sf_violation_chunklen( |
116 | struct net *net, | |
117 | const struct sctp_endpoint *ep, | |
118 | const struct sctp_association *asoc, | |
119 | const union sctp_subtype type, | |
120 | void *arg, | |
121 | struct sctp_cmd_seq *commands); | |
1da177e4 | 122 | |
172a1599 XL |
123 | static enum sctp_disposition sctp_sf_violation_paramlen( |
124 | struct net *net, | |
125 | const struct sctp_endpoint *ep, | |
126 | const struct sctp_association *asoc, | |
127 | const union sctp_subtype type, | |
128 | void *arg, void *ext, | |
129 | struct sctp_cmd_seq *commands); | |
6f4c618d | 130 | |
172a1599 XL |
131 | static enum sctp_disposition sctp_sf_violation_ctsn( |
132 | struct net *net, | |
133 | const struct sctp_endpoint *ep, | |
134 | const struct sctp_association *asoc, | |
135 | const union sctp_subtype type, | |
136 | void *arg, | |
137 | struct sctp_cmd_seq *commands); | |
aecedeab | 138 | |
172a1599 XL |
139 | static enum sctp_disposition sctp_sf_violation_chunk( |
140 | struct net *net, | |
141 | const struct sctp_endpoint *ep, | |
142 | const struct sctp_association *asoc, | |
143 | const union sctp_subtype type, | |
144 | void *arg, | |
145 | struct sctp_cmd_seq *commands); | |
ece25dfa | 146 | |
4785c7ae | 147 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 | 148 | const struct sctp_association *asoc, |
172a1599 | 149 | struct sctp_chunk *chunk); |
bbd0d598 | 150 | |
172a1599 XL |
151 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
152 | struct net *net, | |
24cb81a6 | 153 | const struct sctp_endpoint *ep, |
75205f47 | 154 | const struct sctp_association *asoc, |
bfc6f827 | 155 | const union sctp_subtype type, |
75205f47 | 156 | void *arg, |
a85bbeb2 | 157 | struct sctp_cmd_seq *commands); |
75205f47 | 158 | |
1da177e4 LT |
159 | /* Small helper function that checks if the chunk length |
160 | * is of the appropriate length. The 'required_length' argument | |
161 | * is set to be the size of a specific chunk we are testing. | |
509e7a31 MRL |
162 | * Return Values: true = Valid length |
163 | * false = Invalid length | |
1da177e4 LT |
164 | * |
165 | */ | |
172a1599 XL |
166 | static inline bool sctp_chunk_length_valid(struct sctp_chunk *chunk, |
167 | __u16 required_length) | |
1da177e4 LT |
168 | { |
169 | __u16 chunk_length = ntohs(chunk->chunk_hdr->length); | |
170 | ||
26b87c78 DB |
171 | /* Previously already marked? */ |
172 | if (unlikely(chunk->pdiscard)) | |
509e7a31 | 173 | return false; |
1da177e4 | 174 | if (unlikely(chunk_length < required_length)) |
509e7a31 | 175 | return false; |
1da177e4 | 176 | |
509e7a31 | 177 | return true; |
1da177e4 LT |
178 | } |
179 | ||
245709ec XL |
180 | /* Check for format error in an ABORT chunk */ |
181 | static inline bool sctp_err_chunk_valid(struct sctp_chunk *chunk) | |
182 | { | |
183 | struct sctp_errhdr *err; | |
184 | ||
185 | sctp_walk_errors(err, chunk->chunk_hdr); | |
186 | ||
187 | return (void *)err == (void *)chunk->chunk_end; | |
188 | } | |
189 | ||
1da177e4 LT |
190 | /********************************************************** |
191 | * These are the state functions for handling chunk events. | |
192 | **********************************************************/ | |
193 | ||
194 | /* | |
195 | * Process the final SHUTDOWN COMPLETE. | |
196 | * | |
197 | * Section: 4 (C) (diagram), 9.2 | |
198 | * Upon reception of the SHUTDOWN COMPLETE chunk the endpoint will verify | |
199 | * that it is in SHUTDOWN-ACK-SENT state, if it is not the chunk should be | |
200 | * discarded. If the endpoint is in the SHUTDOWN-ACK-SENT state the endpoint | |
201 | * should stop the T2-shutdown timer and remove all knowledge of the | |
202 | * association (and thus the association enters the CLOSED state). | |
203 | * | |
047a2428 | 204 | * Verification Tag: 8.5.1(C), sctpimpguide 2.41. |
1da177e4 LT |
205 | * C) Rules for packet carrying SHUTDOWN COMPLETE: |
206 | * ... | |
047a2428 JF |
207 | * - The receiver of a SHUTDOWN COMPLETE shall accept the packet |
208 | * if the Verification Tag field of the packet matches its own tag and | |
209 | * the T bit is not set | |
210 | * OR | |
211 | * it is set to its peer's tag and the T bit is set in the Chunk | |
212 | * Flags. | |
213 | * Otherwise, the receiver MUST silently discard the packet | |
214 | * and take no further action. An endpoint MUST ignore the | |
215 | * SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state. | |
1da177e4 LT |
216 | * |
217 | * Inputs | |
218 | * (endpoint, asoc, chunk) | |
219 | * | |
220 | * Outputs | |
221 | * (asoc, reply_msg, msg_up, timers, counters) | |
222 | * | |
223 | * The return value is the disposition of the chunk. | |
224 | */ | |
172a1599 XL |
225 | enum sctp_disposition sctp_sf_do_4_C(struct net *net, |
226 | const struct sctp_endpoint *ep, | |
227 | const struct sctp_association *asoc, | |
228 | const union sctp_subtype type, | |
229 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
230 | { |
231 | struct sctp_chunk *chunk = arg; | |
232 | struct sctp_ulpevent *ev; | |
233 | ||
ece25dfa | 234 | if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6 | 235 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
ece25dfa | 236 | |
1da177e4 LT |
237 | /* RFC 2960 6.10 Bundling |
238 | * | |
239 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
240 | * SHUTDOWN COMPLETE with any other chunks. | |
241 | */ | |
242 | if (!chunk->singleton) | |
24cb81a6 | 243 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 244 | |
ece25dfa | 245 | /* Make sure that the SHUTDOWN_COMPLETE chunk has a valid length. */ |
922dbc5b | 246 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 247 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 248 | commands); |
1da177e4 LT |
249 | |
250 | /* RFC 2960 10.2 SCTP-to-ULP | |
251 | * | |
252 | * H) SHUTDOWN COMPLETE notification | |
253 | * | |
254 | * When SCTP completes the shutdown procedures (section 9.2) this | |
255 | * notification is passed to the upper layer. | |
256 | */ | |
257 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 258 | 0, 0, 0, NULL, GFP_ATOMIC); |
df7deeb5 VY |
259 | if (ev) |
260 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
d808ad9a | 261 | SCTP_ULPEVENT(ev)); |
1da177e4 LT |
262 | |
263 | /* Upon reception of the SHUTDOWN COMPLETE chunk the endpoint | |
264 | * will verify that it is in SHUTDOWN-ACK-SENT state, if it is | |
265 | * not the chunk should be discarded. If the endpoint is in | |
266 | * the SHUTDOWN-ACK-SENT state the endpoint should stop the | |
267 | * T2-shutdown timer and remove all knowledge of the | |
268 | * association (and thus the association enters the CLOSED | |
269 | * state). | |
270 | */ | |
271 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
272 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
273 | ||
274 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
275 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
276 | ||
277 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
278 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
279 | ||
b01a2407 EB |
280 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
281 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
282 | |
283 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
284 | ||
285 | return SCTP_DISPOSITION_DELETE_TCB; | |
1da177e4 LT |
286 | } |
287 | ||
288 | /* | |
289 | * Respond to a normal INIT chunk. | |
290 | * We are the side that is being asked for an association. | |
291 | * | |
292 | * Section: 5.1 Normal Establishment of an Association, B | |
293 | * B) "Z" shall respond immediately with an INIT ACK chunk. The | |
294 | * destination IP address of the INIT ACK MUST be set to the source | |
295 | * IP address of the INIT to which this INIT ACK is responding. In | |
296 | * the response, besides filling in other parameters, "Z" must set the | |
297 | * Verification Tag field to Tag_A, and also provide its own | |
298 | * Verification Tag (Tag_Z) in the Initiate Tag field. | |
299 | * | |
d808ad9a | 300 | * Verification Tag: Must be 0. |
1da177e4 LT |
301 | * |
302 | * Inputs | |
303 | * (endpoint, asoc, chunk) | |
304 | * | |
305 | * Outputs | |
306 | * (asoc, reply_msg, msg_up, timers, counters) | |
307 | * | |
308 | * The return value is the disposition of the chunk. | |
309 | */ | |
172a1599 XL |
310 | enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net, |
311 | const struct sctp_endpoint *ep, | |
312 | const struct sctp_association *asoc, | |
313 | const union sctp_subtype type, | |
314 | void *arg, | |
315 | struct sctp_cmd_seq *commands) | |
1da177e4 | 316 | { |
62e6b7e4 XL |
317 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
318 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 319 | struct sctp_association *new_asoc; |
1da177e4 | 320 | struct sctp_packet *packet; |
1da177e4 LT |
321 | int len; |
322 | ||
2277c7cd RH |
323 | /* Update socket peer label if first association. */ |
324 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
325 | chunk->skb)) | |
326 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
327 | ||
1da177e4 LT |
328 | /* 6.10 Bundling |
329 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
330 | * SHUTDOWN COMPLETE with any other chunks. | |
d808ad9a | 331 | * |
1da177e4 LT |
332 | * IG Section 2.11.2 |
333 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
334 | * enforce these rules by silently discarding an arriving packet | |
335 | * with an INIT chunk that is bundled with other chunks. | |
336 | */ | |
337 | if (!chunk->singleton) | |
24cb81a6 | 338 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
339 | |
340 | /* If the packet is an OOTB packet which is temporarily on the | |
341 | * control endpoint, respond with an ABORT. | |
342 | */ | |
2ce95503 | 343 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 344 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 345 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 346 | } |
1da177e4 | 347 | |
1da177e4 | 348 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification |
d808ad9a | 349 | * Tag. |
1da177e4 LT |
350 | */ |
351 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 352 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
353 | |
354 | /* Make sure that the INIT chunk has a valid length. | |
355 | * Normally, this would cause an ABORT with a Protocol Violation | |
356 | * error, but since we don't have an association, we'll | |
357 | * just discard the packet. | |
358 | */ | |
01a992be | 359 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 360 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 361 | |
bec9640b VY |
362 | /* If the INIT is coming toward a closing socket, we'll send back |
363 | * and ABORT. Essentially, this catches the race of INIT being | |
0c2c366e | 364 | * backloged to the socket at the same time as the user issues close(). |
bec9640b VY |
365 | * Since the socket and all its associations are going away, we |
366 | * can treat this OOTB | |
367 | */ | |
368 | if (sctp_sstate(ep->base.sk, CLOSING)) | |
24cb81a6 | 369 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
bec9640b | 370 | |
1da177e4 LT |
371 | /* Verify the INIT chunk before processing it. */ |
372 | err_chunk = NULL; | |
b14878cc | 373 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 374 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
375 | &err_chunk)) { |
376 | /* This chunk contains fatal error. It is to be discarded. | |
377 | * Send an ABORT, with causes if there is any. | |
378 | */ | |
379 | if (err_chunk) { | |
24cb81a6 | 380 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 381 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 382 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 383 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 384 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
385 | |
386 | sctp_chunk_free(err_chunk); | |
387 | ||
388 | if (packet) { | |
389 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
390 | SCTP_PACKET(packet)); | |
b01a2407 | 391 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
392 | return SCTP_DISPOSITION_CONSUME; |
393 | } else { | |
394 | return SCTP_DISPOSITION_NOMEM; | |
395 | } | |
396 | } else { | |
24cb81a6 | 397 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
398 | commands); |
399 | } | |
400 | } | |
401 | ||
d808ad9a | 402 | /* Grab the INIT header. */ |
4ae70c08 | 403 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
404 | |
405 | /* Tag the variable length parameters. */ | |
4ae70c08 | 406 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
407 | |
408 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
409 | if (!new_asoc) | |
410 | goto nomem; | |
411 | ||
409b95af VY |
412 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
413 | sctp_scope(sctp_source(chunk)), | |
414 | GFP_ATOMIC) < 0) | |
415 | goto nomem_init; | |
416 | ||
1da177e4 | 417 | /* The call, sctp_process_init(), can fail on memory allocation. */ |
de6becdc | 418 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 419 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
1da177e4 LT |
420 | GFP_ATOMIC)) |
421 | goto nomem_init; | |
422 | ||
1da177e4 LT |
423 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ |
424 | ||
425 | /* If there are errors need to be reported for unknown parameters, | |
426 | * make sure to reserve enough room in the INIT ACK for them. | |
427 | */ | |
428 | len = 0; | |
429 | if (err_chunk) | |
430 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 431 | sizeof(struct sctp_chunkhdr); |
1da177e4 | 432 | |
1da177e4 LT |
433 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
434 | if (!repl) | |
df7deeb5 | 435 | goto nomem_init; |
1da177e4 LT |
436 | |
437 | /* If there are errors need to be reported for unknown parameters, | |
438 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
439 | * parameter. | |
440 | */ | |
441 | if (err_chunk) { | |
442 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
443 | * ERROR chunk generated by sctp_verify_init(). Since the | |
444 | * error cause code for "unknown parameter" and the | |
445 | * "Unrecognized parameter" type is the same, we can | |
446 | * construct the parameters in INIT ACK by copying the | |
447 | * ERROR causes over. | |
448 | */ | |
62e6b7e4 | 449 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 450 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 451 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
452 | /* Replace the cause code with the "Unrecognized parameter" |
453 | * parameter type. | |
454 | */ | |
455 | sctp_addto_chunk(repl, len, unk_param); | |
456 | sctp_chunk_free(err_chunk); | |
457 | } | |
458 | ||
df7deeb5 VY |
459 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); |
460 | ||
1da177e4 LT |
461 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
462 | ||
463 | /* | |
464 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
465 | * "Z" MUST NOT allocate any resources, nor keep any states for the | |
466 | * new association. Otherwise, "Z" will be vulnerable to resource | |
467 | * attacks. | |
468 | */ | |
469 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
470 | ||
471 | return SCTP_DISPOSITION_DELETE_TCB; | |
472 | ||
1da177e4 LT |
473 | nomem_init: |
474 | sctp_association_free(new_asoc); | |
475 | nomem: | |
df7deeb5 VY |
476 | if (err_chunk) |
477 | sctp_chunk_free(err_chunk); | |
1da177e4 LT |
478 | return SCTP_DISPOSITION_NOMEM; |
479 | } | |
480 | ||
481 | /* | |
482 | * Respond to a normal INIT ACK chunk. | |
483 | * We are the side that is initiating the association. | |
484 | * | |
485 | * Section: 5.1 Normal Establishment of an Association, C | |
486 | * C) Upon reception of the INIT ACK from "Z", "A" shall stop the T1-init | |
487 | * timer and leave COOKIE-WAIT state. "A" shall then send the State | |
488 | * Cookie received in the INIT ACK chunk in a COOKIE ECHO chunk, start | |
489 | * the T1-cookie timer, and enter the COOKIE-ECHOED state. | |
490 | * | |
491 | * Note: The COOKIE ECHO chunk can be bundled with any pending outbound | |
492 | * DATA chunks, but it MUST be the first chunk in the packet and | |
493 | * until the COOKIE ACK is returned the sender MUST NOT send any | |
494 | * other packets to the peer. | |
495 | * | |
496 | * Verification Tag: 3.3.3 | |
497 | * If the value of the Initiate Tag in a received INIT ACK chunk is | |
498 | * found to be 0, the receiver MUST treat it as an error and close the | |
499 | * association by transmitting an ABORT. | |
500 | * | |
501 | * Inputs | |
502 | * (endpoint, asoc, chunk) | |
503 | * | |
504 | * Outputs | |
505 | * (asoc, reply_msg, msg_up, timers, counters) | |
506 | * | |
507 | * The return value is the disposition of the chunk. | |
508 | */ | |
172a1599 XL |
509 | enum sctp_disposition sctp_sf_do_5_1C_ack(struct net *net, |
510 | const struct sctp_endpoint *ep, | |
511 | const struct sctp_association *asoc, | |
512 | const union sctp_subtype type, | |
513 | void *arg, | |
514 | struct sctp_cmd_seq *commands) | |
1da177e4 | 515 | { |
01a992be | 516 | struct sctp_init_chunk *initchunk; |
172a1599 | 517 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
518 | struct sctp_chunk *err_chunk; |
519 | struct sctp_packet *packet; | |
1da177e4 LT |
520 | |
521 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 522 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 523 | |
1da177e4 LT |
524 | /* 6.10 Bundling |
525 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
526 | * SHUTDOWN COMPLETE with any other chunks. | |
527 | */ | |
528 | if (!chunk->singleton) | |
24cb81a6 | 529 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 530 | |
ece25dfa | 531 | /* Make sure that the INIT-ACK chunk has a valid length */ |
cb1844c4 | 532 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_initack_chunk))) |
24cb81a6 | 533 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 534 | commands); |
1da177e4 | 535 | /* Grab the INIT header. */ |
4ae70c08 | 536 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 | 537 | |
1da177e4 LT |
538 | /* Verify the INIT chunk before processing it. */ |
539 | err_chunk = NULL; | |
b14878cc | 540 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 541 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
542 | &err_chunk)) { |
543 | ||
2a493216 | 544 | enum sctp_error error = SCTP_ERROR_NO_RESOURCE; |
853f4b50 | 545 | |
1da177e4 | 546 | /* This chunk contains fatal error. It is to be discarded. |
d6701191 VY |
547 | * Send an ABORT, with causes. If there are no causes, |
548 | * then there wasn't enough memory. Just terminate | |
549 | * the association. | |
1da177e4 LT |
550 | */ |
551 | if (err_chunk) { | |
24cb81a6 | 552 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 553 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 554 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 555 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 556 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
557 | |
558 | sctp_chunk_free(err_chunk); | |
559 | ||
560 | if (packet) { | |
561 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
562 | SCTP_PACKET(packet)); | |
24cb81a6 | 563 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
8de8c873 | 564 | error = SCTP_ERROR_INV_PARAM; |
1da177e4 | 565 | } |
1da177e4 | 566 | } |
bbd0d598 VY |
567 | |
568 | /* SCTP-AUTH, Section 6.3: | |
569 | * It should be noted that if the receiver wants to tear | |
570 | * down an association in an authenticated way only, the | |
571 | * handling of malformed packets should not result in | |
572 | * tearing down the association. | |
573 | * | |
574 | * This means that if we only want to abort associations | |
575 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 576 | * can't destroy this association just because the packet |
bbd0d598 VY |
577 | * was malformed. |
578 | */ | |
579 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
24cb81a6 | 580 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 | 581 | |
24cb81a6 EB |
582 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
583 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, | |
8de8c873 | 584 | asoc, chunk->transport); |
1da177e4 LT |
585 | } |
586 | ||
587 | /* Tag the variable length parameters. Note that we never | |
588 | * convert the parameters in an INIT chunk. | |
589 | */ | |
4ae70c08 | 590 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 | 591 | |
01a992be | 592 | initchunk = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
593 | |
594 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_INIT, | |
595 | SCTP_PEER_INIT(initchunk)); | |
596 | ||
3f7a87d2 FF |
597 | /* Reset init error count upon receipt of INIT-ACK. */ |
598 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); | |
599 | ||
1da177e4 LT |
600 | /* 5.1 C) "A" shall stop the T1-init timer and leave |
601 | * COOKIE-WAIT state. "A" shall then ... start the T1-cookie | |
602 | * timer, and enter the COOKIE-ECHOED state. | |
603 | */ | |
604 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
605 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
606 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
607 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
608 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
609 | SCTP_STATE(SCTP_STATE_COOKIE_ECHOED)); | |
610 | ||
0c2c366e ZY |
611 | /* SCTP-AUTH: generate the association shared keys so that |
612 | * we can potentially sign the COOKIE-ECHO. | |
730fc3d0 VY |
613 | */ |
614 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_SHKEY, SCTP_NULL()); | |
615 | ||
1da177e4 LT |
616 | /* 5.1 C) "A" shall then send the State Cookie received in the |
617 | * INIT ACK chunk in a COOKIE ECHO chunk, ... | |
618 | */ | |
619 | /* If there is any errors to report, send the ERROR chunk generated | |
620 | * for unknown parameters as well. | |
621 | */ | |
622 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_COOKIE_ECHO, | |
623 | SCTP_CHUNK(err_chunk)); | |
624 | ||
625 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
626 | } |
627 | ||
59d8d443 XL |
628 | static bool sctp_auth_chunk_verify(struct net *net, struct sctp_chunk *chunk, |
629 | const struct sctp_association *asoc) | |
630 | { | |
631 | struct sctp_chunk auth; | |
632 | ||
633 | if (!chunk->auth_chunk) | |
634 | return true; | |
635 | ||
636 | /* SCTP-AUTH: auth_chunk pointer is only set when the cookie-echo | |
637 | * is supposed to be authenticated and we have to do delayed | |
638 | * authentication. We've just recreated the association using | |
639 | * the information in the cookie and now it's much easier to | |
640 | * do the authentication. | |
641 | */ | |
642 | ||
643 | /* Make sure that we and the peer are AUTH capable */ | |
644 | if (!net->sctp.auth_enable || !asoc->peer.auth_capable) | |
645 | return false; | |
646 | ||
647 | /* set-up our fake chunk so that we can process it */ | |
648 | auth.skb = chunk->auth_chunk; | |
649 | auth.asoc = chunk->asoc; | |
650 | auth.sctp_hdr = chunk->sctp_hdr; | |
651 | auth.chunk_hdr = (struct sctp_chunkhdr *) | |
652 | skb_push(chunk->auth_chunk, | |
653 | sizeof(struct sctp_chunkhdr)); | |
654 | skb_pull(chunk->auth_chunk, sizeof(struct sctp_chunkhdr)); | |
655 | auth.transport = chunk->transport; | |
656 | ||
657 | return sctp_sf_authenticate(asoc, &auth) == SCTP_IERROR_NO_ERROR; | |
658 | } | |
659 | ||
1da177e4 LT |
660 | /* |
661 | * Respond to a normal COOKIE ECHO chunk. | |
662 | * We are the side that is being asked for an association. | |
663 | * | |
664 | * Section: 5.1 Normal Establishment of an Association, D | |
665 | * D) Upon reception of the COOKIE ECHO chunk, Endpoint "Z" will reply | |
666 | * with a COOKIE ACK chunk after building a TCB and moving to | |
667 | * the ESTABLISHED state. A COOKIE ACK chunk may be bundled with | |
668 | * any pending DATA chunks (and/or SACK chunks), but the COOKIE ACK | |
669 | * chunk MUST be the first chunk in the packet. | |
670 | * | |
671 | * IMPLEMENTATION NOTE: An implementation may choose to send the | |
672 | * Communication Up notification to the SCTP user upon reception | |
673 | * of a valid COOKIE ECHO chunk. | |
674 | * | |
675 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
676 | * D) Rules for packet carrying a COOKIE ECHO | |
677 | * | |
678 | * - When sending a COOKIE ECHO, the endpoint MUST use the value of the | |
679 | * Initial Tag received in the INIT ACK. | |
680 | * | |
681 | * - The receiver of a COOKIE ECHO follows the procedures in Section 5. | |
682 | * | |
683 | * Inputs | |
684 | * (endpoint, asoc, chunk) | |
685 | * | |
686 | * Outputs | |
687 | * (asoc, reply_msg, msg_up, timers, counters) | |
688 | * | |
689 | * The return value is the disposition of the chunk. | |
690 | */ | |
172a1599 XL |
691 | enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net, |
692 | const struct sctp_endpoint *ep, | |
693 | const struct sctp_association *asoc, | |
694 | const union sctp_subtype type, | |
695 | void *arg, | |
696 | struct sctp_cmd_seq *commands) | |
1da177e4 | 697 | { |
30f6ebf6 | 698 | struct sctp_ulpevent *ev, *ai_ev = NULL, *auth_ev = NULL; |
1da177e4 | 699 | struct sctp_association *new_asoc; |
01a992be | 700 | struct sctp_init_chunk *peer_init; |
172a1599 | 701 | struct sctp_chunk *chunk = arg; |
1da177e4 | 702 | struct sctp_chunk *err_chk_p; |
172a1599 | 703 | struct sctp_chunk *repl; |
609ee467 | 704 | struct sock *sk; |
172a1599 | 705 | int error = 0; |
1da177e4 LT |
706 | |
707 | /* If the packet is an OOTB packet which is temporarily on the | |
708 | * control endpoint, respond with an ABORT. | |
709 | */ | |
2ce95503 | 710 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 711 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 712 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 713 | } |
1da177e4 LT |
714 | |
715 | /* Make sure that the COOKIE_ECHO chunk has a valid length. | |
716 | * In this case, we check that we have enough for at least a | |
717 | * chunk header. More detailed verification is done | |
718 | * in sctp_unpack_cookie(). | |
719 | */ | |
922dbc5b | 720 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 721 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 722 | |
609ee467 VY |
723 | /* If the endpoint is not listening or if the number of associations |
724 | * on the TCP-style socket exceed the max backlog, respond with an | |
725 | * ABORT. | |
726 | */ | |
727 | sk = ep->base.sk; | |
728 | if (!sctp_sstate(sk, LISTENING) || | |
729 | (sctp_style(sk, TCP) && sk_acceptq_is_full(sk))) | |
24cb81a6 | 730 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
609ee467 | 731 | |
1da177e4 LT |
732 | /* "Decode" the chunk. We have no optional parameters so we |
733 | * are in good shape. | |
734 | */ | |
d808ad9a | 735 | chunk->subh.cookie_hdr = |
1da177e4 | 736 | (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 737 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 738 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 739 | goto nomem; |
1da177e4 LT |
740 | |
741 | /* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint | |
742 | * "Z" will reply with a COOKIE ACK chunk after building a TCB | |
743 | * and moving to the ESTABLISHED state. | |
744 | */ | |
745 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
746 | &err_chk_p); | |
747 | ||
748 | /* FIXME: | |
749 | * If the re-build failed, what is the proper error path | |
750 | * from here? | |
751 | * | |
752 | * [We should abort the association. --piggy] | |
753 | */ | |
754 | if (!new_asoc) { | |
755 | /* FIXME: Several errors are possible. A bad cookie should | |
756 | * be silently discarded, but think about logging it too. | |
757 | */ | |
758 | switch (error) { | |
759 | case -SCTP_IERROR_NOMEM: | |
760 | goto nomem; | |
761 | ||
762 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 763 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 764 | err_chk_p); |
24cb81a6 | 765 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
766 | |
767 | case -SCTP_IERROR_BAD_SIG: | |
768 | default: | |
24cb81a6 | 769 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 770 | } |
1da177e4 LT |
771 | } |
772 | ||
1da177e4 | 773 | |
df7deeb5 VY |
774 | /* Delay state machine commands until later. |
775 | * | |
776 | * Re-build the bind address for the association is done in | |
1da177e4 LT |
777 | * the sctp_unpack_cookie() already. |
778 | */ | |
779 | /* This is a brand-new association, so these are not yet side | |
780 | * effects--it is safe to run them here. | |
781 | */ | |
782 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
783 | ||
de6becdc | 784 | if (!sctp_process_init(new_asoc, chunk, |
6a1e5f33 | 785 | &chunk->subh.cookie_hdr->c.peer_addr, |
1da177e4 LT |
786 | peer_init, GFP_ATOMIC)) |
787 | goto nomem_init; | |
788 | ||
730fc3d0 | 789 | /* SCTP-AUTH: Now that we've populate required fields in |
0c2c366e | 790 | * sctp_process_init, set up the association shared keys as |
730fc3d0 VY |
791 | * necessary so that we can potentially authenticate the ACK |
792 | */ | |
793 | error = sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC); | |
794 | if (error) | |
795 | goto nomem_init; | |
796 | ||
59d8d443 XL |
797 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) { |
798 | sctp_association_free(new_asoc); | |
799 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
bbd0d598 VY |
800 | } |
801 | ||
1da177e4 LT |
802 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
803 | if (!repl) | |
df7deeb5 | 804 | goto nomem_init; |
1da177e4 LT |
805 | |
806 | /* RFC 2960 5.1 Normal Establishment of an Association | |
807 | * | |
808 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
809 | * send the Communication Up notification to the SCTP user | |
810 | * upon reception of a valid COOKIE ECHO chunk. | |
811 | */ | |
812 | ev = sctp_ulpevent_make_assoc_change(new_asoc, 0, SCTP_COMM_UP, 0, | |
813 | new_asoc->c.sinit_num_ostreams, | |
814 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 815 | NULL, GFP_ATOMIC); |
1da177e4 LT |
816 | if (!ev) |
817 | goto nomem_ev; | |
818 | ||
d808ad9a | 819 | /* Sockets API Draft Section 5.3.1.6 |
0f3fffd8 | 820 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 821 | * delivers this notification to inform the application that of the |
0f3fffd8 | 822 | * peers requested adaptation layer. |
1da177e4 | 823 | */ |
0f3fffd8 ISJ |
824 | if (new_asoc->peer.adaptation_ind) { |
825 | ai_ev = sctp_ulpevent_make_adaptation_indication(new_asoc, | |
1da177e4 | 826 | GFP_ATOMIC); |
df7deeb5 VY |
827 | if (!ai_ev) |
828 | goto nomem_aiev; | |
829 | } | |
830 | ||
30f6ebf6 XL |
831 | if (!new_asoc->peer.auth_capable) { |
832 | auth_ev = sctp_ulpevent_make_authkey(new_asoc, 0, | |
833 | SCTP_AUTH_NO_AUTH, | |
834 | GFP_ATOMIC); | |
835 | if (!auth_ev) | |
836 | goto nomem_authev; | |
837 | } | |
838 | ||
df7deeb5 VY |
839 | /* Add all the state machine commands now since we've created |
840 | * everything. This way we don't introduce memory corruptions | |
0c2c366e | 841 | * during side-effect processing and correctly count established |
df7deeb5 VY |
842 | * associations. |
843 | */ | |
844 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
845 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
846 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
847 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
848 | SCTP_INC_STATS(net, SCTP_MIB_PASSIVEESTABS); | |
df7deeb5 VY |
849 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
850 | ||
9f70f46b | 851 | if (new_asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
df7deeb5 VY |
852 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
853 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
854 | ||
df7deeb5 VY |
855 | /* This will send the COOKIE ACK */ |
856 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
857 | ||
858 | /* Queue the ASSOC_CHANGE event */ | |
859 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
860 | ||
861 | /* Send up the Adaptation Layer Indication event */ | |
862 | if (ai_ev) | |
1da177e4 | 863 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
df7deeb5 | 864 | SCTP_ULPEVENT(ai_ev)); |
1da177e4 | 865 | |
30f6ebf6 XL |
866 | if (auth_ev) |
867 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
868 | SCTP_ULPEVENT(auth_ev)); | |
869 | ||
1da177e4 LT |
870 | return SCTP_DISPOSITION_CONSUME; |
871 | ||
30f6ebf6 XL |
872 | nomem_authev: |
873 | sctp_ulpevent_free(ai_ev); | |
df7deeb5 VY |
874 | nomem_aiev: |
875 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
876 | nomem_ev: |
877 | sctp_chunk_free(repl); | |
1da177e4 LT |
878 | nomem_init: |
879 | sctp_association_free(new_asoc); | |
880 | nomem: | |
881 | return SCTP_DISPOSITION_NOMEM; | |
882 | } | |
883 | ||
884 | /* | |
885 | * Respond to a normal COOKIE ACK chunk. | |
b52effd2 | 886 | * We are the side that is asking for an association. |
1da177e4 LT |
887 | * |
888 | * RFC 2960 5.1 Normal Establishment of an Association | |
889 | * | |
890 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move from the | |
891 | * COOKIE-ECHOED state to the ESTABLISHED state, stopping the T1-cookie | |
892 | * timer. It may also notify its ULP about the successful | |
893 | * establishment of the association with a Communication Up | |
894 | * notification (see Section 10). | |
895 | * | |
896 | * Verification Tag: | |
897 | * Inputs | |
898 | * (endpoint, asoc, chunk) | |
899 | * | |
900 | * Outputs | |
901 | * (asoc, reply_msg, msg_up, timers, counters) | |
902 | * | |
903 | * The return value is the disposition of the chunk. | |
904 | */ | |
172a1599 XL |
905 | enum sctp_disposition sctp_sf_do_5_1E_ca(struct net *net, |
906 | const struct sctp_endpoint *ep, | |
907 | const struct sctp_association *asoc, | |
908 | const union sctp_subtype type, | |
909 | void *arg, | |
910 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
911 | { |
912 | struct sctp_chunk *chunk = arg; | |
913 | struct sctp_ulpevent *ev; | |
914 | ||
915 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 916 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
917 | |
918 | /* Verify that the chunk length for the COOKIE-ACK is OK. | |
919 | * If we don't do this, any bundled chunks may be junked. | |
920 | */ | |
922dbc5b | 921 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 922 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
923 | commands); |
924 | ||
925 | /* Reset init error count upon receipt of COOKIE-ACK, | |
0c2c366e | 926 | * to avoid problems with the management of this |
1da177e4 LT |
927 | * counter in stale cookie situations when a transition back |
928 | * from the COOKIE-ECHOED state to the COOKIE-WAIT | |
929 | * state is performed. | |
930 | */ | |
3f7a87d2 | 931 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); |
1da177e4 | 932 | |
2277c7cd RH |
933 | /* Set peer label for connection. */ |
934 | security_inet_conn_established(ep->base.sk, chunk->skb); | |
935 | ||
1da177e4 LT |
936 | /* RFC 2960 5.1 Normal Establishment of an Association |
937 | * | |
938 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move | |
939 | * from the COOKIE-ECHOED state to the ESTABLISHED state, | |
940 | * stopping the T1-cookie timer. | |
941 | */ | |
942 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
943 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
944 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
945 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
946 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
947 | SCTP_INC_STATS(net, SCTP_MIB_ACTIVEESTABS); | |
1da177e4 | 948 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
9f70f46b | 949 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
950 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
951 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
1da177e4 LT |
952 | |
953 | /* It may also notify its ULP about the successful | |
954 | * establishment of the association with a Communication Up | |
955 | * notification (see Section 10). | |
956 | */ | |
957 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_UP, | |
958 | 0, asoc->c.sinit_num_ostreams, | |
959 | asoc->c.sinit_max_instreams, | |
a5a35e76 | 960 | NULL, GFP_ATOMIC); |
1da177e4 LT |
961 | |
962 | if (!ev) | |
963 | goto nomem; | |
964 | ||
965 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
966 | ||
967 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 968 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 969 | * delivers this notification to inform the application that of the |
0f3fffd8 | 970 | * peers requested adaptation layer. |
1da177e4 | 971 | */ |
0f3fffd8 ISJ |
972 | if (asoc->peer.adaptation_ind) { |
973 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1da177e4 LT |
974 | if (!ev) |
975 | goto nomem; | |
976 | ||
977 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
978 | SCTP_ULPEVENT(ev)); | |
979 | } | |
980 | ||
30f6ebf6 XL |
981 | if (!asoc->peer.auth_capable) { |
982 | ev = sctp_ulpevent_make_authkey(asoc, 0, SCTP_AUTH_NO_AUTH, | |
983 | GFP_ATOMIC); | |
984 | if (!ev) | |
985 | goto nomem; | |
986 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
987 | SCTP_ULPEVENT(ev)); | |
988 | } | |
989 | ||
1da177e4 LT |
990 | return SCTP_DISPOSITION_CONSUME; |
991 | nomem: | |
992 | return SCTP_DISPOSITION_NOMEM; | |
993 | } | |
994 | ||
995 | /* Generate and sendout a heartbeat packet. */ | |
172a1599 XL |
996 | static enum sctp_disposition sctp_sf_heartbeat( |
997 | const struct sctp_endpoint *ep, | |
998 | const struct sctp_association *asoc, | |
999 | const union sctp_subtype type, | |
1000 | void *arg, | |
1001 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1002 | { |
1003 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
1004 | struct sctp_chunk *reply; | |
1da177e4 LT |
1005 | |
1006 | /* Send a heartbeat to our peer. */ | |
fe59379b | 1007 | reply = sctp_make_heartbeat(asoc, transport, 0); |
1da177e4 LT |
1008 | if (!reply) |
1009 | return SCTP_DISPOSITION_NOMEM; | |
1010 | ||
1011 | /* Set rto_pending indicating that an RTT measurement | |
1012 | * is started with this heartbeat chunk. | |
1013 | */ | |
1014 | sctp_add_cmd_sf(commands, SCTP_CMD_RTO_PENDING, | |
1015 | SCTP_TRANSPORT(transport)); | |
1016 | ||
1017 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1018 | return SCTP_DISPOSITION_CONSUME; | |
1019 | } | |
1020 | ||
1021 | /* Generate a HEARTBEAT packet on the given transport. */ | |
172a1599 XL |
1022 | enum sctp_disposition sctp_sf_sendbeat_8_3(struct net *net, |
1023 | const struct sctp_endpoint *ep, | |
1024 | const struct sctp_association *asoc, | |
1025 | const union sctp_subtype type, | |
1026 | void *arg, | |
1027 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1028 | { |
1029 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
1030 | ||
b9f84786 | 1031 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
1032 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
1033 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
1034 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
1035 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 1036 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
1037 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1038 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
1039 | return SCTP_DISPOSITION_DELETE_TCB; |
1040 | } | |
1041 | ||
1042 | /* Section 3.3.5. | |
1043 | * The Sender-specific Heartbeat Info field should normally include | |
1044 | * information about the sender's current time when this HEARTBEAT | |
1045 | * chunk is sent and the destination transport address to which this | |
1046 | * HEARTBEAT is sent (see Section 8.3). | |
1047 | */ | |
1048 | ||
52ccb8e9 | 1049 | if (transport->param_flags & SPP_HB_ENABLE) { |
1da177e4 LT |
1050 | if (SCTP_DISPOSITION_NOMEM == |
1051 | sctp_sf_heartbeat(ep, asoc, type, arg, | |
1052 | commands)) | |
1053 | return SCTP_DISPOSITION_NOMEM; | |
245cba7e | 1054 | |
1da177e4 LT |
1055 | /* Set transport error counter and association error counter |
1056 | * when sending heartbeat. | |
1057 | */ | |
7e99013a | 1058 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
1da177e4 LT |
1059 | SCTP_TRANSPORT(transport)); |
1060 | } | |
245cba7e VY |
1061 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_IDLE, |
1062 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
1063 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMER_UPDATE, |
1064 | SCTP_TRANSPORT(transport)); | |
1065 | ||
d808ad9a | 1066 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1067 | } |
1068 | ||
7b9438de | 1069 | /* resend asoc strreset_chunk. */ |
172a1599 XL |
1070 | enum sctp_disposition sctp_sf_send_reconf(struct net *net, |
1071 | const struct sctp_endpoint *ep, | |
1072 | const struct sctp_association *asoc, | |
1073 | const union sctp_subtype type, | |
1074 | void *arg, | |
1075 | struct sctp_cmd_seq *commands) | |
7b9438de XL |
1076 | { |
1077 | struct sctp_transport *transport = arg; | |
1078 | ||
1079 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
1080 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
1081 | SCTP_ERROR(ETIMEDOUT)); | |
1082 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
1083 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
1084 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
1085 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
1086 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1087 | return SCTP_DISPOSITION_DELETE_TCB; | |
1088 | } | |
1089 | ||
1090 | sctp_chunk_hold(asoc->strreset_chunk); | |
1091 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1092 | SCTP_CHUNK(asoc->strreset_chunk)); | |
1093 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
1094 | ||
1095 | return SCTP_DISPOSITION_CONSUME; | |
1096 | } | |
1097 | ||
92548ec2 XL |
1098 | /* send hb chunk with padding for PLPMUTD. */ |
1099 | enum sctp_disposition sctp_sf_send_probe(struct net *net, | |
1100 | const struct sctp_endpoint *ep, | |
1101 | const struct sctp_association *asoc, | |
1102 | const union sctp_subtype type, | |
1103 | void *arg, | |
1104 | struct sctp_cmd_seq *commands) | |
1105 | { | |
1106 | struct sctp_transport *transport = (struct sctp_transport *)arg; | |
fe59379b XL |
1107 | struct sctp_chunk *reply; |
1108 | ||
1109 | if (!sctp_transport_pl_enabled(transport)) | |
1110 | return SCTP_DISPOSITION_CONSUME; | |
92548ec2 | 1111 | |
058e6e0e XL |
1112 | if (sctp_transport_pl_send(transport)) { |
1113 | reply = sctp_make_heartbeat(asoc, transport, transport->pl.probe_size); | |
1114 | if (!reply) | |
1115 | return SCTP_DISPOSITION_NOMEM; | |
1116 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1117 | } | |
92548ec2 XL |
1118 | sctp_add_cmd_sf(commands, SCTP_CMD_PROBE_TIMER_UPDATE, |
1119 | SCTP_TRANSPORT(transport)); | |
1120 | ||
1121 | return SCTP_DISPOSITION_CONSUME; | |
1122 | } | |
1123 | ||
1da177e4 LT |
1124 | /* |
1125 | * Process an heartbeat request. | |
1126 | * | |
1127 | * Section: 8.3 Path Heartbeat | |
1128 | * The receiver of the HEARTBEAT should immediately respond with a | |
1129 | * HEARTBEAT ACK that contains the Heartbeat Information field copied | |
1130 | * from the received HEARTBEAT chunk. | |
1131 | * | |
1132 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1133 | * When receiving an SCTP packet, the endpoint MUST ensure that the | |
1134 | * value in the Verification Tag field of the received SCTP packet | |
1135 | * matches its own Tag. If the received Verification Tag value does not | |
1136 | * match the receiver's own tag value, the receiver shall silently | |
1137 | * discard the packet and shall not process it any further except for | |
1138 | * those cases listed in Section 8.5.1 below. | |
1139 | * | |
1140 | * Inputs | |
1141 | * (endpoint, asoc, chunk) | |
1142 | * | |
1143 | * Outputs | |
1144 | * (asoc, reply_msg, msg_up, timers, counters) | |
1145 | * | |
1146 | * The return value is the disposition of the chunk. | |
1147 | */ | |
172a1599 XL |
1148 | enum sctp_disposition sctp_sf_beat_8_3(struct net *net, |
1149 | const struct sctp_endpoint *ep, | |
1150 | const struct sctp_association *asoc, | |
1151 | const union sctp_subtype type, | |
1152 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 1153 | { |
3c918704 | 1154 | struct sctp_paramhdr *param_hdr; |
1da177e4 LT |
1155 | struct sctp_chunk *chunk = arg; |
1156 | struct sctp_chunk *reply; | |
1157 | size_t paylen = 0; | |
1158 | ||
1159 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1160 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1161 | |
1162 | /* Make sure that the HEARTBEAT chunk has a valid length. */ | |
38c00f74 XL |
1163 | if (!sctp_chunk_length_valid(chunk, |
1164 | sizeof(struct sctp_heartbeat_chunk))) | |
24cb81a6 | 1165 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1166 | commands); |
1167 | ||
1168 | /* 8.3 The receiver of the HEARTBEAT should immediately | |
1169 | * respond with a HEARTBEAT ACK that contains the Heartbeat | |
1170 | * Information field copied from the received HEARTBEAT chunk. | |
1171 | */ | |
4d2dcdf4 | 1172 | chunk->subh.hb_hdr = (struct sctp_heartbeathdr *)chunk->skb->data; |
3c918704 | 1173 | param_hdr = (struct sctp_paramhdr *)chunk->subh.hb_hdr; |
922dbc5b | 1174 | paylen = ntohs(chunk->chunk_hdr->length) - sizeof(struct sctp_chunkhdr); |
06a31e2b TG |
1175 | |
1176 | if (ntohs(param_hdr->length) > paylen) | |
1177 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
1178 | param_hdr, commands); | |
1179 | ||
62b08083 SS |
1180 | if (!pskb_pull(chunk->skb, paylen)) |
1181 | goto nomem; | |
1da177e4 | 1182 | |
06a31e2b | 1183 | reply = sctp_make_heartbeat_ack(asoc, chunk, param_hdr, paylen); |
1da177e4 LT |
1184 | if (!reply) |
1185 | goto nomem; | |
1186 | ||
1187 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1188 | return SCTP_DISPOSITION_CONSUME; | |
1189 | ||
1190 | nomem: | |
1191 | return SCTP_DISPOSITION_NOMEM; | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Process the returning HEARTBEAT ACK. | |
1196 | * | |
1197 | * Section: 8.3 Path Heartbeat | |
1198 | * Upon the receipt of the HEARTBEAT ACK, the sender of the HEARTBEAT | |
1199 | * should clear the error counter of the destination transport | |
1200 | * address to which the HEARTBEAT was sent, and mark the destination | |
1201 | * transport address as active if it is not so marked. The endpoint may | |
1202 | * optionally report to the upper layer when an inactive destination | |
1203 | * address is marked as active due to the reception of the latest | |
1204 | * HEARTBEAT ACK. The receiver of the HEARTBEAT ACK must also | |
1205 | * clear the association overall error count as well (as defined | |
1206 | * in section 8.1). | |
1207 | * | |
1208 | * The receiver of the HEARTBEAT ACK should also perform an RTT | |
1209 | * measurement for that destination transport address using the time | |
1210 | * value carried in the HEARTBEAT ACK chunk. | |
1211 | * | |
1212 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1213 | * | |
1214 | * Inputs | |
1215 | * (endpoint, asoc, chunk) | |
1216 | * | |
1217 | * Outputs | |
1218 | * (asoc, reply_msg, msg_up, timers, counters) | |
1219 | * | |
1220 | * The return value is the disposition of the chunk. | |
1221 | */ | |
172a1599 XL |
1222 | enum sctp_disposition sctp_sf_backbeat_8_3(struct net *net, |
1223 | const struct sctp_endpoint *ep, | |
1224 | const struct sctp_association *asoc, | |
1225 | const union sctp_subtype type, | |
1226 | void *arg, | |
1227 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1228 | { |
edf903f8 | 1229 | struct sctp_sender_hb_info *hbinfo; |
1da177e4 | 1230 | struct sctp_chunk *chunk = arg; |
1da177e4 | 1231 | struct sctp_transport *link; |
1da177e4 | 1232 | unsigned long max_interval; |
edf903f8 | 1233 | union sctp_addr from_addr; |
1da177e4 LT |
1234 | |
1235 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1236 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1237 | |
1238 | /* Make sure that the HEARTBEAT-ACK chunk has a valid length. */ | |
922dbc5b | 1239 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr) + |
edf903f8 | 1240 | sizeof(*hbinfo))) |
24cb81a6 | 1241 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1242 | commands); |
1243 | ||
edf903f8 | 1244 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
a601266e | 1245 | /* Make sure that the length of the parameter is what we expect */ |
edf903f8 | 1246 | if (ntohs(hbinfo->param_hdr.length) != sizeof(*hbinfo)) |
a601266e | 1247 | return SCTP_DISPOSITION_DISCARD; |
a601266e | 1248 | |
1da177e4 | 1249 | from_addr = hbinfo->daddr; |
63de08f4 | 1250 | link = sctp_assoc_lookup_paddr(asoc, &from_addr); |
1da177e4 LT |
1251 | |
1252 | /* This should never happen, but lets log it if so. */ | |
3f7a87d2 FF |
1253 | if (unlikely(!link)) { |
1254 | if (from_addr.sa.sa_family == AF_INET6) { | |
e87cc472 JP |
1255 | net_warn_ratelimited("%s association %p could not find address %pI6\n", |
1256 | __func__, | |
1257 | asoc, | |
1258 | &from_addr.v6.sin6_addr); | |
3f7a87d2 | 1259 | } else { |
e87cc472 JP |
1260 | net_warn_ratelimited("%s association %p could not find address %pI4\n", |
1261 | __func__, | |
1262 | asoc, | |
1263 | &from_addr.v4.sin_addr.s_addr); | |
3f7a87d2 | 1264 | } |
1da177e4 LT |
1265 | return SCTP_DISPOSITION_DISCARD; |
1266 | } | |
1267 | ||
ad8fec17 SS |
1268 | /* Validate the 64-bit random nonce. */ |
1269 | if (hbinfo->hb_nonce != link->hb_nonce) | |
1270 | return SCTP_DISPOSITION_DISCARD; | |
1271 | ||
fe59379b XL |
1272 | if (hbinfo->probe_size) { |
1273 | if (hbinfo->probe_size != link->pl.probe_size || | |
1274 | !sctp_transport_pl_enabled(link)) | |
1275 | return SCTP_DISPOSITION_DISCARD; | |
1276 | ||
058e6e0e | 1277 | if (sctp_transport_pl_recv(link)) |
fea1d5b1 XL |
1278 | return SCTP_DISPOSITION_CONSUME; |
1279 | ||
1280 | return sctp_sf_send_probe(net, ep, asoc, type, link, commands); | |
fe59379b XL |
1281 | } |
1282 | ||
52ccb8e9 | 1283 | max_interval = link->hbinterval + link->rto; |
1da177e4 LT |
1284 | |
1285 | /* Check if the timestamp looks valid. */ | |
1286 | if (time_after(hbinfo->sent_at, jiffies) || | |
1287 | time_after(jiffies, hbinfo->sent_at + max_interval)) { | |
bb33381d DB |
1288 | pr_debug("%s: HEARTBEAT ACK with invalid timestamp received " |
1289 | "for transport:%p\n", __func__, link); | |
1290 | ||
1da177e4 LT |
1291 | return SCTP_DISPOSITION_DISCARD; |
1292 | } | |
1293 | ||
1294 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of | |
1295 | * the HEARTBEAT should clear the error counter of the | |
1296 | * destination transport address to which the HEARTBEAT was | |
1297 | * sent and mark the destination transport address as active if | |
1298 | * it is not so marked. | |
1299 | */ | |
1300 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_ON, SCTP_TRANSPORT(link)); | |
1301 | ||
1302 | return SCTP_DISPOSITION_CONSUME; | |
1303 | } | |
1304 | ||
1305 | /* Helper function to send out an abort for the restart | |
1306 | * condition. | |
1307 | */ | |
2ce95503 | 1308 | static int sctp_sf_send_restart_abort(struct net *net, union sctp_addr *ssa, |
1da177e4 | 1309 | struct sctp_chunk *init, |
a85bbeb2 | 1310 | struct sctp_cmd_seq *commands) |
1da177e4 | 1311 | { |
172a1599 | 1312 | struct sctp_af *af = sctp_get_af_specific(ssa->v4.sin_family); |
1da177e4 LT |
1313 | union sctp_addr_param *addrparm; |
1314 | struct sctp_errhdr *errhdr; | |
d8238d9d | 1315 | char buffer[sizeof(*errhdr) + sizeof(*addrparm)]; |
172a1599 XL |
1316 | struct sctp_endpoint *ep; |
1317 | struct sctp_packet *pkt; | |
1318 | int len; | |
1da177e4 LT |
1319 | |
1320 | /* Build the error on the stack. We are way to malloc crazy | |
1321 | * throughout the code today. | |
1322 | */ | |
1323 | errhdr = (struct sctp_errhdr *)buffer; | |
1324 | addrparm = (union sctp_addr_param *)errhdr->variable; | |
1325 | ||
1326 | /* Copy into a parm format. */ | |
1327 | len = af->to_addr_param(ssa, addrparm); | |
d8238d9d | 1328 | len += sizeof(*errhdr); |
1da177e4 LT |
1329 | |
1330 | errhdr->cause = SCTP_ERROR_RESTART; | |
1331 | errhdr->length = htons(len); | |
1332 | ||
1333 | /* Assign to the control socket. */ | |
2ce95503 | 1334 | ep = sctp_sk(net->sctp.ctl_sock)->ep; |
1da177e4 LT |
1335 | |
1336 | /* Association is NULL since this may be a restart attack and we | |
1337 | * want to send back the attacker's vtag. | |
1338 | */ | |
24cb81a6 | 1339 | pkt = sctp_abort_pkt_new(net, ep, NULL, init, errhdr, len); |
1da177e4 LT |
1340 | |
1341 | if (!pkt) | |
1342 | goto out; | |
1343 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(pkt)); | |
1344 | ||
b01a2407 | 1345 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1346 | |
1347 | /* Discard the rest of the inbound packet. */ | |
1348 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); | |
1349 | ||
1350 | out: | |
1351 | /* Even if there is no memory, treat as a failure so | |
1352 | * the packet will get dropped. | |
1353 | */ | |
1354 | return 0; | |
1355 | } | |
1356 | ||
123031c0 JP |
1357 | static bool list_has_sctp_addr(const struct list_head *list, |
1358 | union sctp_addr *ipaddr) | |
1359 | { | |
1360 | struct sctp_transport *addr; | |
1361 | ||
1362 | list_for_each_entry(addr, list, transports) { | |
1363 | if (sctp_cmp_addr_exact(ipaddr, &addr->ipaddr)) | |
1364 | return true; | |
1365 | } | |
1366 | ||
1367 | return false; | |
1368 | } | |
1da177e4 LT |
1369 | /* A restart is occurring, check to make sure no new addresses |
1370 | * are being added as we may be under a takeover attack. | |
1371 | */ | |
1372 | static int sctp_sf_check_restart_addrs(const struct sctp_association *new_asoc, | |
1373 | const struct sctp_association *asoc, | |
1374 | struct sctp_chunk *init, | |
a85bbeb2 | 1375 | struct sctp_cmd_seq *commands) |
1da177e4 | 1376 | { |
4e7696d9 | 1377 | struct net *net = new_asoc->base.net; |
123031c0 JP |
1378 | struct sctp_transport *new_addr; |
1379 | int ret = 1; | |
1da177e4 | 1380 | |
123031c0 | 1381 | /* Implementor's Guide - Section 5.2.2 |
1da177e4 LT |
1382 | * ... |
1383 | * Before responding the endpoint MUST check to see if the | |
1384 | * unexpected INIT adds new addresses to the association. If new | |
1385 | * addresses are added to the association, the endpoint MUST respond | |
1386 | * with an ABORT.. | |
1387 | */ | |
1388 | ||
1389 | /* Search through all current addresses and make sure | |
1390 | * we aren't adding any new ones. | |
1391 | */ | |
9dbc15f0 | 1392 | list_for_each_entry(new_addr, &new_asoc->peer.transport_addr_list, |
123031c0 JP |
1393 | transports) { |
1394 | if (!list_has_sctp_addr(&asoc->peer.transport_addr_list, | |
1395 | &new_addr->ipaddr)) { | |
2ce95503 | 1396 | sctp_sf_send_restart_abort(net, &new_addr->ipaddr, init, |
123031c0 JP |
1397 | commands); |
1398 | ret = 0; | |
1da177e4 | 1399 | break; |
123031c0 | 1400 | } |
1da177e4 LT |
1401 | } |
1402 | ||
1403 | /* Return success if all addresses were found. */ | |
123031c0 | 1404 | return ret; |
1da177e4 LT |
1405 | } |
1406 | ||
1407 | /* Populate the verification/tie tags based on overlapping INIT | |
1408 | * scenario. | |
1409 | * | |
1410 | * Note: Do not use in CLOSED or SHUTDOWN-ACK-SENT state. | |
1411 | */ | |
1412 | static void sctp_tietags_populate(struct sctp_association *new_asoc, | |
1413 | const struct sctp_association *asoc) | |
1414 | { | |
1415 | switch (asoc->state) { | |
1416 | ||
1417 | /* 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State */ | |
1418 | ||
1419 | case SCTP_STATE_COOKIE_WAIT: | |
1420 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1421 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1422 | new_asoc->c.peer_ttag = 0; | |
1423 | break; | |
1424 | ||
1425 | case SCTP_STATE_COOKIE_ECHOED: | |
1426 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1427 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1428 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1429 | break; | |
1430 | ||
1431 | /* 5.2.2 Unexpected INIT in States Other than CLOSED, COOKIE-ECHOED, | |
1432 | * COOKIE-WAIT and SHUTDOWN-ACK-SENT | |
1433 | */ | |
1434 | default: | |
1435 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1436 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1437 | break; | |
3ff50b79 | 1438 | } |
1da177e4 LT |
1439 | |
1440 | /* Other parameters for the endpoint SHOULD be copied from the | |
1441 | * existing parameters of the association (e.g. number of | |
1442 | * outbound streams) into the INIT ACK and cookie. | |
1443 | */ | |
1444 | new_asoc->rwnd = asoc->rwnd; | |
1445 | new_asoc->c.sinit_num_ostreams = asoc->c.sinit_num_ostreams; | |
1446 | new_asoc->c.sinit_max_instreams = asoc->c.sinit_max_instreams; | |
1447 | new_asoc->c.initial_tsn = asoc->c.initial_tsn; | |
1448 | } | |
1449 | ||
1450 | /* | |
1451 | * Compare vtag/tietag values to determine unexpected COOKIE-ECHO | |
1452 | * handling action. | |
1453 | * | |
1454 | * RFC 2960 5.2.4 Handle a COOKIE ECHO when a TCB exists. | |
1455 | * | |
1456 | * Returns value representing action to be taken. These action values | |
1457 | * correspond to Action/Description values in RFC 2960, Table 2. | |
1458 | */ | |
1459 | static char sctp_tietags_compare(struct sctp_association *new_asoc, | |
1460 | const struct sctp_association *asoc) | |
1461 | { | |
1462 | /* In this case, the peer may have restarted. */ | |
1463 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1464 | (asoc->c.peer_vtag != new_asoc->c.peer_vtag) && | |
1465 | (asoc->c.my_vtag == new_asoc->c.my_ttag) && | |
1466 | (asoc->c.peer_vtag == new_asoc->c.peer_ttag)) | |
1467 | return 'A'; | |
1468 | ||
1469 | /* Collision case B. */ | |
1470 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1471 | ((asoc->c.peer_vtag != new_asoc->c.peer_vtag) || | |
1472 | (0 == asoc->c.peer_vtag))) { | |
1473 | return 'B'; | |
1474 | } | |
1475 | ||
1476 | /* Collision case D. */ | |
1477 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1478 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag)) | |
1479 | return 'D'; | |
1480 | ||
1481 | /* Collision case C. */ | |
1482 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1483 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag) && | |
1484 | (0 == new_asoc->c.my_ttag) && | |
1485 | (0 == new_asoc->c.peer_ttag)) | |
1486 | return 'C'; | |
1487 | ||
1488 | /* No match to any of the special cases; discard this packet. */ | |
1489 | return 'E'; | |
1490 | } | |
1491 | ||
fb373c84 | 1492 | /* Common helper routine for both duplicate and simultaneous INIT |
1da177e4 LT |
1493 | * chunk handling. |
1494 | */ | |
172a1599 XL |
1495 | static enum sctp_disposition sctp_sf_do_unexpected_init( |
1496 | struct net *net, | |
1497 | const struct sctp_endpoint *ep, | |
1498 | const struct sctp_association *asoc, | |
1499 | const union sctp_subtype type, | |
1500 | void *arg, | |
1501 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1502 | { |
62e6b7e4 XL |
1503 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
1504 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 1505 | struct sctp_association *new_asoc; |
172a1599 | 1506 | enum sctp_disposition retval; |
1da177e4 | 1507 | struct sctp_packet *packet; |
1da177e4 LT |
1508 | int len; |
1509 | ||
2277c7cd RH |
1510 | /* Update socket peer label if first association. */ |
1511 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
1512 | chunk->skb)) | |
1513 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1514 | ||
1da177e4 LT |
1515 | /* 6.10 Bundling |
1516 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
1517 | * SHUTDOWN COMPLETE with any other chunks. | |
1518 | * | |
1519 | * IG Section 2.11.2 | |
1520 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
1521 | * enforce these rules by silently discarding an arriving packet | |
1522 | * with an INIT chunk that is bundled with other chunks. | |
1523 | */ | |
1524 | if (!chunk->singleton) | |
24cb81a6 | 1525 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1526 | |
1527 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification | |
d808ad9a | 1528 | * Tag. |
1da177e4 LT |
1529 | */ |
1530 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 1531 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1532 | |
1533 | /* Make sure that the INIT chunk has a valid length. | |
1534 | * In this case, we generate a protocol violation since we have | |
1535 | * an association established. | |
1536 | */ | |
01a992be | 1537 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 1538 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 1539 | commands); |
1c16a186 XL |
1540 | |
1541 | if (SCTP_INPUT_CB(chunk->skb)->encap_port != chunk->transport->encap_port) | |
1542 | return sctp_sf_new_encap_port(net, ep, asoc, type, arg, commands); | |
1543 | ||
1da177e4 | 1544 | /* Grab the INIT header. */ |
4ae70c08 | 1545 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
1546 | |
1547 | /* Tag the variable length parameters. */ | |
4ae70c08 | 1548 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
1549 | |
1550 | /* Verify the INIT chunk before processing it. */ | |
1551 | err_chunk = NULL; | |
b14878cc | 1552 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 1553 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
1554 | &err_chunk)) { |
1555 | /* This chunk contains fatal error. It is to be discarded. | |
1556 | * Send an ABORT, with causes if there is any. | |
1557 | */ | |
1558 | if (err_chunk) { | |
24cb81a6 | 1559 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 1560 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1561 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 1562 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 1563 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1564 | |
1565 | if (packet) { | |
1566 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
1567 | SCTP_PACKET(packet)); | |
24cb81a6 | 1568 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1569 | retval = SCTP_DISPOSITION_CONSUME; |
1570 | } else { | |
1571 | retval = SCTP_DISPOSITION_NOMEM; | |
1572 | } | |
1573 | goto cleanup; | |
1574 | } else { | |
24cb81a6 | 1575 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
1576 | commands); |
1577 | } | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Other parameters for the endpoint SHOULD be copied from the | |
1582 | * existing parameters of the association (e.g. number of | |
1583 | * outbound streams) into the INIT ACK and cookie. | |
1584 | * FIXME: We are copying parameters from the endpoint not the | |
1585 | * association. | |
1586 | */ | |
1587 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
1588 | if (!new_asoc) | |
1589 | goto nomem; | |
1590 | ||
409b95af VY |
1591 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
1592 | sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0) | |
1593 | goto nomem; | |
1594 | ||
1da177e4 LT |
1595 | /* In the outbound INIT ACK the endpoint MUST copy its current |
1596 | * Verification Tag and Peers Verification tag into a reserved | |
1597 | * place (local tie-tag and per tie-tag) within the state cookie. | |
1598 | */ | |
de6becdc | 1599 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 1600 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
df7deeb5 VY |
1601 | GFP_ATOMIC)) |
1602 | goto nomem; | |
1da177e4 LT |
1603 | |
1604 | /* Make sure no new addresses are being added during the | |
1605 | * restart. Do not do this check for COOKIE-WAIT state, | |
1606 | * since there are no peer addresses to check against. | |
1607 | * Upon return an ABORT will have been sent if needed. | |
1608 | */ | |
1609 | if (!sctp_state(asoc, COOKIE_WAIT)) { | |
1610 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, | |
1611 | commands)) { | |
1612 | retval = SCTP_DISPOSITION_CONSUME; | |
df7deeb5 | 1613 | goto nomem_retval; |
1da177e4 LT |
1614 | } |
1615 | } | |
1616 | ||
1617 | sctp_tietags_populate(new_asoc, asoc); | |
1618 | ||
1619 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ | |
1620 | ||
1621 | /* If there are errors need to be reported for unknown parameters, | |
1622 | * make sure to reserve enough room in the INIT ACK for them. | |
1623 | */ | |
1624 | len = 0; | |
1625 | if (err_chunk) { | |
1626 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 1627 | sizeof(struct sctp_chunkhdr); |
1da177e4 LT |
1628 | } |
1629 | ||
1da177e4 LT |
1630 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
1631 | if (!repl) | |
1632 | goto nomem; | |
1633 | ||
1634 | /* If there are errors need to be reported for unknown parameters, | |
1635 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
1636 | * parameter. | |
1637 | */ | |
1638 | if (err_chunk) { | |
1639 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
1640 | * ERROR chunk generated by sctp_verify_init(). Since the | |
1641 | * error cause code for "unknown parameter" and the | |
1642 | * "Unrecognized parameter" type is the same, we can | |
1643 | * construct the parameters in INIT ACK by copying the | |
1644 | * ERROR causes over. | |
1645 | */ | |
62e6b7e4 | 1646 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 1647 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1648 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1649 | /* Replace the cause code with the "Unrecognized parameter" |
1650 | * parameter type. | |
1651 | */ | |
1652 | sctp_addto_chunk(repl, len, unk_param); | |
1653 | } | |
1654 | ||
1655 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
1656 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1657 | ||
1658 | /* | |
1659 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
1660 | * "Z" MUST NOT allocate any resources for this new association. | |
1661 | * Otherwise, "Z" will be vulnerable to resource attacks. | |
1662 | */ | |
1663 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
1664 | retval = SCTP_DISPOSITION_CONSUME; | |
1665 | ||
df7deeb5 VY |
1666 | return retval; |
1667 | ||
1668 | nomem: | |
1669 | retval = SCTP_DISPOSITION_NOMEM; | |
1670 | nomem_retval: | |
1671 | if (new_asoc) | |
1672 | sctp_association_free(new_asoc); | |
1da177e4 LT |
1673 | cleanup: |
1674 | if (err_chunk) | |
1675 | sctp_chunk_free(err_chunk); | |
1676 | return retval; | |
1da177e4 LT |
1677 | } |
1678 | ||
1679 | /* | |
25985edc | 1680 | * Handle simultaneous INIT. |
1da177e4 LT |
1681 | * This means we started an INIT and then we got an INIT request from |
1682 | * our peer. | |
1683 | * | |
1684 | * Section: 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State (Item B) | |
1685 | * This usually indicates an initialization collision, i.e., each | |
1686 | * endpoint is attempting, at about the same time, to establish an | |
1687 | * association with the other endpoint. | |
1688 | * | |
1689 | * Upon receipt of an INIT in the COOKIE-WAIT or COOKIE-ECHOED state, an | |
1690 | * endpoint MUST respond with an INIT ACK using the same parameters it | |
1691 | * sent in its original INIT chunk (including its Verification Tag, | |
1692 | * unchanged). These original parameters are combined with those from the | |
1693 | * newly received INIT chunk. The endpoint shall also generate a State | |
1694 | * Cookie with the INIT ACK. The endpoint uses the parameters sent in its | |
1695 | * INIT to calculate the State Cookie. | |
1696 | * | |
1697 | * After that, the endpoint MUST NOT change its state, the T1-init | |
1698 | * timer shall be left running and the corresponding TCB MUST NOT be | |
1699 | * destroyed. The normal procedures for handling State Cookies when | |
1700 | * a TCB exists will resolve the duplicate INITs to a single association. | |
1701 | * | |
1702 | * For an endpoint that is in the COOKIE-ECHOED state it MUST populate | |
1703 | * its Tie-Tags with the Tag information of itself and its peer (see | |
1704 | * section 5.2.2 for a description of the Tie-Tags). | |
1705 | * | |
1706 | * Verification Tag: Not explicit, but an INIT can not have a valid | |
1707 | * verification tag, so we skip the check. | |
1708 | * | |
1709 | * Inputs | |
1710 | * (endpoint, asoc, chunk) | |
1711 | * | |
1712 | * Outputs | |
1713 | * (asoc, reply_msg, msg_up, timers, counters) | |
1714 | * | |
1715 | * The return value is the disposition of the chunk. | |
1716 | */ | |
172a1599 XL |
1717 | enum sctp_disposition sctp_sf_do_5_2_1_siminit( |
1718 | struct net *net, | |
1719 | const struct sctp_endpoint *ep, | |
1720 | const struct sctp_association *asoc, | |
1721 | const union sctp_subtype type, | |
1722 | void *arg, | |
1723 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1724 | { |
fb373c84 | 1725 | /* Call helper to do the real work for both simultaneous and |
1da177e4 LT |
1726 | * duplicate INIT chunk handling. |
1727 | */ | |
24cb81a6 | 1728 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1729 | } |
1730 | ||
1731 | /* | |
1732 | * Handle duplicated INIT messages. These are usually delayed | |
1733 | * restransmissions. | |
1734 | * | |
1735 | * Section: 5.2.2 Unexpected INIT in States Other than CLOSED, | |
1736 | * COOKIE-ECHOED and COOKIE-WAIT | |
1737 | * | |
1738 | * Unless otherwise stated, upon reception of an unexpected INIT for | |
1739 | * this association, the endpoint shall generate an INIT ACK with a | |
1740 | * State Cookie. In the outbound INIT ACK the endpoint MUST copy its | |
1741 | * current Verification Tag and peer's Verification Tag into a reserved | |
1742 | * place within the state cookie. We shall refer to these locations as | |
1743 | * the Peer's-Tie-Tag and the Local-Tie-Tag. The outbound SCTP packet | |
1744 | * containing this INIT ACK MUST carry a Verification Tag value equal to | |
1745 | * the Initiation Tag found in the unexpected INIT. And the INIT ACK | |
1746 | * MUST contain a new Initiation Tag (randomly generated see Section | |
1747 | * 5.3.1). Other parameters for the endpoint SHOULD be copied from the | |
1748 | * existing parameters of the association (e.g. number of outbound | |
1749 | * streams) into the INIT ACK and cookie. | |
1750 | * | |
1751 | * After sending out the INIT ACK, the endpoint shall take no further | |
1752 | * actions, i.e., the existing association, including its current state, | |
1753 | * and the corresponding TCB MUST NOT be changed. | |
1754 | * | |
1755 | * Note: Only when a TCB exists and the association is not in a COOKIE- | |
1756 | * WAIT state are the Tie-Tags populated. For a normal association INIT | |
1757 | * (i.e. the endpoint is in a COOKIE-WAIT state), the Tie-Tags MUST be | |
1758 | * set to 0 (indicating that no previous TCB existed). The INIT ACK and | |
1759 | * State Cookie are populated as specified in section 5.2.1. | |
1760 | * | |
1761 | * Verification Tag: Not specified, but an INIT has no way of knowing | |
1762 | * what the verification tag could be, so we ignore it. | |
1763 | * | |
1764 | * Inputs | |
1765 | * (endpoint, asoc, chunk) | |
1766 | * | |
1767 | * Outputs | |
1768 | * (asoc, reply_msg, msg_up, timers, counters) | |
1769 | * | |
1770 | * The return value is the disposition of the chunk. | |
1771 | */ | |
172a1599 XL |
1772 | enum sctp_disposition sctp_sf_do_5_2_2_dupinit( |
1773 | struct net *net, | |
24cb81a6 | 1774 | const struct sctp_endpoint *ep, |
1da177e4 | 1775 | const struct sctp_association *asoc, |
bfc6f827 | 1776 | const union sctp_subtype type, |
1da177e4 | 1777 | void *arg, |
a85bbeb2 | 1778 | struct sctp_cmd_seq *commands) |
1da177e4 | 1779 | { |
fb373c84 | 1780 | /* Call helper to do the real work for both simultaneous and |
1da177e4 LT |
1781 | * duplicate INIT chunk handling. |
1782 | */ | |
24cb81a6 | 1783 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1784 | } |
1785 | ||
1786 | ||
610ab73a VY |
1787 | /* |
1788 | * Unexpected INIT-ACK handler. | |
1789 | * | |
1790 | * Section 5.2.3 | |
1791 | * If an INIT ACK received by an endpoint in any state other than the | |
1792 | * COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk. | |
1793 | * An unexpected INIT ACK usually indicates the processing of an old or | |
1794 | * duplicated INIT chunk. | |
1795 | */ | |
172a1599 XL |
1796 | enum sctp_disposition sctp_sf_do_5_2_3_initack( |
1797 | struct net *net, | |
1798 | const struct sctp_endpoint *ep, | |
1799 | const struct sctp_association *asoc, | |
1800 | const union sctp_subtype type, | |
1801 | void *arg, | |
1802 | struct sctp_cmd_seq *commands) | |
610ab73a VY |
1803 | { |
1804 | /* Per the above section, we'll discard the chunk if we have an | |
1805 | * endpoint. If this is an OOTB INIT-ACK, treat it as such. | |
1806 | */ | |
2ce95503 | 1807 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) |
24cb81a6 | 1808 | return sctp_sf_ootb(net, ep, asoc, type, arg, commands); |
610ab73a | 1809 | else |
24cb81a6 | 1810 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
610ab73a | 1811 | } |
1da177e4 | 1812 | |
51eac7f2 XL |
1813 | static int sctp_sf_do_assoc_update(struct sctp_association *asoc, |
1814 | struct sctp_association *new, | |
1815 | struct sctp_cmd_seq *cmds) | |
1816 | { | |
1817 | struct net *net = asoc->base.net; | |
1818 | struct sctp_chunk *abort; | |
1819 | ||
1820 | if (!sctp_assoc_update(asoc, new)) | |
1821 | return 0; | |
1822 | ||
1823 | abort = sctp_make_abort(asoc, NULL, sizeof(struct sctp_errhdr)); | |
1824 | if (abort) { | |
1825 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); | |
1826 | sctp_add_cmd_sf(cmds, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1827 | } | |
1828 | sctp_add_cmd_sf(cmds, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); | |
1829 | sctp_add_cmd_sf(cmds, SCTP_CMD_ASSOC_FAILED, | |
1830 | SCTP_PERR(SCTP_ERROR_RSRC_LOW)); | |
1831 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
1832 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1833 | ||
1834 | return -ENOMEM; | |
1835 | } | |
1836 | ||
1da177e4 LT |
1837 | /* Unexpected COOKIE-ECHO handler for peer restart (Table 2, action 'A') |
1838 | * | |
1839 | * Section 5.2.4 | |
1840 | * A) In this case, the peer may have restarted. | |
1841 | */ | |
172a1599 XL |
1842 | static enum sctp_disposition sctp_sf_do_dupcook_a( |
1843 | struct net *net, | |
24cb81a6 | 1844 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1845 | const struct sctp_association *asoc, |
1846 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1847 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1848 | struct sctp_association *new_asoc) |
1849 | { | |
01a992be | 1850 | struct sctp_init_chunk *peer_init; |
172a1599 | 1851 | enum sctp_disposition disposition; |
1da177e4 LT |
1852 | struct sctp_ulpevent *ev; |
1853 | struct sctp_chunk *repl; | |
1854 | struct sctp_chunk *err; | |
1da177e4 LT |
1855 | |
1856 | /* new_asoc is a brand-new association, so these are not yet | |
1857 | * side effects--it is safe to run them here. | |
1858 | */ | |
1859 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
1860 | ||
de6becdc | 1861 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1862 | GFP_ATOMIC)) |
1863 | goto nomem; | |
1864 | ||
4842a08f XL |
1865 | if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC)) |
1866 | goto nomem; | |
1867 | ||
59d8d443 XL |
1868 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) |
1869 | return SCTP_DISPOSITION_DISCARD; | |
1870 | ||
1da177e4 LT |
1871 | /* Make sure no new addresses are being added during the |
1872 | * restart. Though this is a pretty complicated attack | |
1873 | * since you'd have to get inside the cookie. | |
1874 | */ | |
59d8d443 | 1875 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, commands)) |
1da177e4 | 1876 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1877 | |
1878 | /* If the endpoint is in the SHUTDOWN-ACK-SENT state and recognizes | |
1879 | * the peer has restarted (Action A), it MUST NOT setup a new | |
1880 | * association but instead resend the SHUTDOWN ACK and send an ERROR | |
1881 | * chunk with a "Cookie Received while Shutting Down" error cause to | |
1882 | * its peer. | |
1883 | */ | |
1884 | if (sctp_state(asoc, SHUTDOWN_ACK_SENT)) { | |
24cb81a6 | 1885 | disposition = sctp_sf_do_9_2_reshutack(net, ep, asoc, |
1da177e4 LT |
1886 | SCTP_ST_CHUNK(chunk->chunk_hdr->type), |
1887 | chunk, commands); | |
1888 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
1889 | goto nomem; | |
1890 | ||
1891 | err = sctp_make_op_error(asoc, chunk, | |
1892 | SCTP_ERROR_COOKIE_IN_SHUTDOWN, | |
6383cfb3 | 1893 | NULL, 0, 0); |
1da177e4 LT |
1894 | if (err) |
1895 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1896 | SCTP_CHUNK(err)); | |
1897 | ||
1898 | return SCTP_DISPOSITION_CONSUME; | |
1899 | } | |
1900 | ||
a000c01e WY |
1901 | /* For now, stop pending T3-rtx and SACK timers, fail any unsent/unacked |
1902 | * data. Consider the optional choice of resending of this data. | |
1da177e4 | 1903 | */ |
a000c01e WY |
1904 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); |
1905 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1906 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 LT |
1907 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_OUTQUEUE, SCTP_NULL()); |
1908 | ||
a000c01e WY |
1909 | /* Stop pending T4-rto timer, teardown ASCONF queue, ASCONF-ACK queue |
1910 | * and ASCONF-ACK cache. | |
1911 | */ | |
1912 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1913 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
1914 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_ASCONF_QUEUE, SCTP_NULL()); | |
1915 | ||
35b4f244 | 1916 | /* Update the content of current association. */ |
51eac7f2 | 1917 | if (sctp_sf_do_assoc_update((struct sctp_association *)asoc, new_asoc, commands)) |
35b4f244 | 1918 | goto nomem; |
35b4f244 XL |
1919 | |
1920 | repl = sctp_make_cookie_ack(asoc, chunk); | |
1da177e4 LT |
1921 | if (!repl) |
1922 | goto nomem; | |
1923 | ||
1da177e4 LT |
1924 | /* Report association restart to upper layer. */ |
1925 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_RESTART, 0, | |
35b4f244 XL |
1926 | asoc->c.sinit_num_ostreams, |
1927 | asoc->c.sinit_max_instreams, | |
a5a35e76 | 1928 | NULL, GFP_ATOMIC); |
1da177e4 LT |
1929 | if (!ev) |
1930 | goto nomem_ev; | |
1931 | ||
1932 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
d3e8e4c1 JL |
1933 | if ((sctp_state(asoc, SHUTDOWN_PENDING) || |
1934 | sctp_state(asoc, SHUTDOWN_SENT)) && | |
bdf6fa52 VY |
1935 | (sctp_sstate(asoc->base.sk, CLOSING) || |
1936 | sock_flag(asoc->base.sk, SOCK_DEAD))) { | |
d3e8e4c1 JL |
1937 | /* If the socket has been closed by user, don't |
1938 | * transition to ESTABLISHED. Instead trigger SHUTDOWN | |
1939 | * bundled with COOKIE_ACK. | |
bdf6fa52 VY |
1940 | */ |
1941 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1942 | return sctp_sf_do_9_2_start_shutdown(net, ep, asoc, | |
22008f56 | 1943 | SCTP_ST_CHUNK(0), repl, |
bdf6fa52 VY |
1944 | commands); |
1945 | } else { | |
1946 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1947 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
1948 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1949 | } | |
1da177e4 LT |
1950 | return SCTP_DISPOSITION_CONSUME; |
1951 | ||
1952 | nomem_ev: | |
1953 | sctp_chunk_free(repl); | |
1954 | nomem: | |
1955 | return SCTP_DISPOSITION_NOMEM; | |
1956 | } | |
1957 | ||
1958 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'B') | |
1959 | * | |
1960 | * Section 5.2.4 | |
1961 | * B) In this case, both sides may be attempting to start an association | |
1962 | * at about the same time but the peer endpoint started its INIT | |
1963 | * after responding to the local endpoint's INIT | |
1964 | */ | |
1965 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1966 | static enum sctp_disposition sctp_sf_do_dupcook_b( |
1967 | struct net *net, | |
24cb81a6 | 1968 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1969 | const struct sctp_association *asoc, |
1970 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1971 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1972 | struct sctp_association *new_asoc) |
1973 | { | |
01a992be | 1974 | struct sctp_init_chunk *peer_init; |
1da177e4 LT |
1975 | struct sctp_chunk *repl; |
1976 | ||
1977 | /* new_asoc is a brand-new association, so these are not yet | |
1978 | * side effects--it is safe to run them here. | |
1979 | */ | |
1980 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
de6becdc | 1981 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1982 | GFP_ATOMIC)) |
1983 | goto nomem; | |
1984 | ||
4842a08f XL |
1985 | if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC)) |
1986 | goto nomem; | |
1987 | ||
59d8d443 XL |
1988 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) |
1989 | return SCTP_DISPOSITION_DISCARD; | |
1990 | ||
1da177e4 LT |
1991 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
1992 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
f282df03 XL |
1993 | if (asoc->state < SCTP_STATE_ESTABLISHED) |
1994 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
1995 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
1996 | ||
51eac7f2 XL |
1997 | /* Update the content of current association. */ |
1998 | if (sctp_sf_do_assoc_update((struct sctp_association *)asoc, new_asoc, commands)) | |
1999 | goto nomem; | |
2000 | ||
2001 | repl = sctp_make_cookie_ack(asoc, chunk); | |
1da177e4 LT |
2002 | if (!repl) |
2003 | goto nomem; | |
2004 | ||
2005 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1da177e4 LT |
2006 | |
2007 | /* RFC 2960 5.1 Normal Establishment of an Association | |
2008 | * | |
2009 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
2010 | * send the Communication Up notification to the SCTP user | |
2011 | * upon reception of a valid COOKIE ECHO chunk. | |
07d93967 VY |
2012 | * |
2013 | * Sadly, this needs to be implemented as a side-effect, because | |
2014 | * we are not guaranteed to have set the association id of the real | |
2015 | * association and so these notifications need to be delayed until | |
2016 | * the association id is allocated. | |
1da177e4 | 2017 | */ |
1da177e4 | 2018 | |
07d93967 | 2019 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_CHANGE, SCTP_U8(SCTP_COMM_UP)); |
1da177e4 LT |
2020 | |
2021 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 2022 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 2023 | * delivers this notification to inform the application that of the |
0f3fffd8 | 2024 | * peers requested adaptation layer. |
07d93967 VY |
2025 | * |
2026 | * This also needs to be done as a side effect for the same reason as | |
2027 | * above. | |
1da177e4 | 2028 | */ |
07d93967 VY |
2029 | if (asoc->peer.adaptation_ind) |
2030 | sctp_add_cmd_sf(commands, SCTP_CMD_ADAPTATION_IND, SCTP_NULL()); | |
1da177e4 | 2031 | |
30f6ebf6 XL |
2032 | if (!asoc->peer.auth_capable) |
2033 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_NO_AUTH, SCTP_NULL()); | |
2034 | ||
1da177e4 LT |
2035 | return SCTP_DISPOSITION_CONSUME; |
2036 | ||
1da177e4 LT |
2037 | nomem: |
2038 | return SCTP_DISPOSITION_NOMEM; | |
2039 | } | |
2040 | ||
2041 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'C') | |
2042 | * | |
2043 | * Section 5.2.4 | |
2044 | * C) In this case, the local endpoint's cookie has arrived late. | |
2045 | * Before it arrived, the local endpoint sent an INIT and received an | |
2046 | * INIT-ACK and finally sent a COOKIE ECHO with the peer's same tag | |
2047 | * but a new tag of its own. | |
2048 | */ | |
2049 | /* This case represents an initialization collision. */ | |
172a1599 XL |
2050 | static enum sctp_disposition sctp_sf_do_dupcook_c( |
2051 | struct net *net, | |
24cb81a6 | 2052 | const struct sctp_endpoint *ep, |
1da177e4 LT |
2053 | const struct sctp_association *asoc, |
2054 | struct sctp_chunk *chunk, | |
a85bbeb2 | 2055 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
2056 | struct sctp_association *new_asoc) |
2057 | { | |
2058 | /* The cookie should be silently discarded. | |
2059 | * The endpoint SHOULD NOT change states and should leave | |
2060 | * any timers running. | |
2061 | */ | |
2062 | return SCTP_DISPOSITION_DISCARD; | |
2063 | } | |
2064 | ||
2065 | /* Unexpected COOKIE-ECHO handler lost chunk (Table 2, action 'D') | |
2066 | * | |
2067 | * Section 5.2.4 | |
2068 | * | |
2069 | * D) When both local and remote tags match the endpoint should always | |
2070 | * enter the ESTABLISHED state, if it has not already done so. | |
2071 | */ | |
2072 | /* This case represents an initialization collision. */ | |
172a1599 XL |
2073 | static enum sctp_disposition sctp_sf_do_dupcook_d( |
2074 | struct net *net, | |
24cb81a6 | 2075 | const struct sctp_endpoint *ep, |
1da177e4 LT |
2076 | const struct sctp_association *asoc, |
2077 | struct sctp_chunk *chunk, | |
a85bbeb2 | 2078 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
2079 | struct sctp_association *new_asoc) |
2080 | { | |
30f6ebf6 | 2081 | struct sctp_ulpevent *ev = NULL, *ai_ev = NULL, *auth_ev = NULL; |
1da177e4 LT |
2082 | struct sctp_chunk *repl; |
2083 | ||
2084 | /* Clarification from Implementor's Guide: | |
2085 | * D) When both local and remote tags match the endpoint should | |
d808ad9a YH |
2086 | * enter the ESTABLISHED state, if it is in the COOKIE-ECHOED state. |
2087 | * It should stop any cookie timer that may be running and send | |
2088 | * a COOKIE ACK. | |
1da177e4 LT |
2089 | */ |
2090 | ||
59d8d443 XL |
2091 | if (!sctp_auth_chunk_verify(net, chunk, asoc)) |
2092 | return SCTP_DISPOSITION_DISCARD; | |
2093 | ||
1da177e4 LT |
2094 | /* Don't accidentally move back into established state. */ |
2095 | if (asoc->state < SCTP_STATE_ESTABLISHED) { | |
2096 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2097 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2098 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2099 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 2100 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
2101 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, |
2102 | SCTP_NULL()); | |
2103 | ||
2104 | /* RFC 2960 5.1 Normal Establishment of an Association | |
2105 | * | |
2106 | * D) IMPLEMENTATION NOTE: An implementation may choose | |
2107 | * to send the Communication Up notification to the | |
2108 | * SCTP user upon reception of a valid COOKIE | |
2109 | * ECHO chunk. | |
2110 | */ | |
df7deeb5 | 2111 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, |
1da177e4 | 2112 | SCTP_COMM_UP, 0, |
df7deeb5 VY |
2113 | asoc->c.sinit_num_ostreams, |
2114 | asoc->c.sinit_max_instreams, | |
9cbcbf4e | 2115 | NULL, GFP_ATOMIC); |
1da177e4 LT |
2116 | if (!ev) |
2117 | goto nomem; | |
1da177e4 LT |
2118 | |
2119 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 2120 | * When a peer sends a Adaptation Layer Indication parameter, |
1da177e4 | 2121 | * SCTP delivers this notification to inform the application |
0f3fffd8 | 2122 | * that of the peers requested adaptation layer. |
1da177e4 | 2123 | */ |
0f3fffd8 ISJ |
2124 | if (asoc->peer.adaptation_ind) { |
2125 | ai_ev = sctp_ulpevent_make_adaptation_indication(asoc, | |
1da177e4 | 2126 | GFP_ATOMIC); |
df7deeb5 | 2127 | if (!ai_ev) |
1da177e4 LT |
2128 | goto nomem; |
2129 | ||
1da177e4 | 2130 | } |
30f6ebf6 XL |
2131 | |
2132 | if (!asoc->peer.auth_capable) { | |
2133 | auth_ev = sctp_ulpevent_make_authkey(asoc, 0, | |
2134 | SCTP_AUTH_NO_AUTH, | |
2135 | GFP_ATOMIC); | |
2136 | if (!auth_ev) | |
2137 | goto nomem; | |
2138 | } | |
1da177e4 | 2139 | } |
1da177e4 | 2140 | |
46e16d4b | 2141 | repl = sctp_make_cookie_ack(asoc, chunk); |
1da177e4 LT |
2142 | if (!repl) |
2143 | goto nomem; | |
2144 | ||
2e3216cd VY |
2145 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
2146 | ||
df7deeb5 VY |
2147 | if (ev) |
2148 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2149 | SCTP_ULPEVENT(ev)); | |
2150 | if (ai_ev) | |
2151 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2152 | SCTP_ULPEVENT(ai_ev)); | |
30f6ebf6 XL |
2153 | if (auth_ev) |
2154 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2155 | SCTP_ULPEVENT(auth_ev)); | |
df7deeb5 | 2156 | |
1da177e4 LT |
2157 | return SCTP_DISPOSITION_CONSUME; |
2158 | ||
2159 | nomem: | |
30f6ebf6 XL |
2160 | if (auth_ev) |
2161 | sctp_ulpevent_free(auth_ev); | |
df7deeb5 VY |
2162 | if (ai_ev) |
2163 | sctp_ulpevent_free(ai_ev); | |
1da177e4 LT |
2164 | if (ev) |
2165 | sctp_ulpevent_free(ev); | |
2166 | return SCTP_DISPOSITION_NOMEM; | |
2167 | } | |
2168 | ||
2169 | /* | |
2170 | * Handle a duplicate COOKIE-ECHO. This usually means a cookie-carrying | |
2171 | * chunk was retransmitted and then delayed in the network. | |
2172 | * | |
2173 | * Section: 5.2.4 Handle a COOKIE ECHO when a TCB exists | |
2174 | * | |
2175 | * Verification Tag: None. Do cookie validation. | |
2176 | * | |
2177 | * Inputs | |
2178 | * (endpoint, asoc, chunk) | |
2179 | * | |
2180 | * Outputs | |
2181 | * (asoc, reply_msg, msg_up, timers, counters) | |
2182 | * | |
2183 | * The return value is the disposition of the chunk. | |
2184 | */ | |
172a1599 XL |
2185 | enum sctp_disposition sctp_sf_do_5_2_4_dupcook( |
2186 | struct net *net, | |
24cb81a6 | 2187 | const struct sctp_endpoint *ep, |
1da177e4 | 2188 | const struct sctp_association *asoc, |
bfc6f827 | 2189 | const union sctp_subtype type, |
1da177e4 | 2190 | void *arg, |
a85bbeb2 | 2191 | struct sctp_cmd_seq *commands) |
1da177e4 | 2192 | { |
1da177e4 | 2193 | struct sctp_association *new_asoc; |
172a1599 XL |
2194 | struct sctp_chunk *chunk = arg; |
2195 | enum sctp_disposition retval; | |
2196 | struct sctp_chunk *err_chk_p; | |
1da177e4 LT |
2197 | int error = 0; |
2198 | char action; | |
1da177e4 LT |
2199 | |
2200 | /* Make sure that the chunk has a valid length from the protocol | |
2201 | * perspective. In this case check to make sure we have at least | |
2202 | * enough for the chunk header. Cookie length verification is | |
2203 | * done later. | |
2204 | */ | |
922dbc5b | 2205 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2206 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2207 | commands); |
2208 | ||
2209 | /* "Decode" the chunk. We have no optional parameters so we | |
2210 | * are in good shape. | |
2211 | */ | |
d808ad9a | 2212 | chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 2213 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 2214 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 2215 | goto nomem; |
1da177e4 LT |
2216 | |
2217 | /* In RFC 2960 5.2.4 3, if both Verification Tags in the State Cookie | |
2218 | * of a duplicate COOKIE ECHO match the Verification Tags of the | |
2219 | * current association, consider the State Cookie valid even if | |
2220 | * the lifespan is exceeded. | |
2221 | */ | |
2222 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
2223 | &err_chk_p); | |
2224 | ||
2225 | /* FIXME: | |
2226 | * If the re-build failed, what is the proper error path | |
2227 | * from here? | |
2228 | * | |
2229 | * [We should abort the association. --piggy] | |
2230 | */ | |
2231 | if (!new_asoc) { | |
2232 | /* FIXME: Several errors are possible. A bad cookie should | |
2233 | * be silently discarded, but think about logging it too. | |
2234 | */ | |
2235 | switch (error) { | |
2236 | case -SCTP_IERROR_NOMEM: | |
2237 | goto nomem; | |
2238 | ||
2239 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 2240 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 2241 | err_chk_p); |
24cb81a6 | 2242 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2243 | case -SCTP_IERROR_BAD_SIG: |
2244 | default: | |
24cb81a6 | 2245 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 2246 | } |
1da177e4 LT |
2247 | } |
2248 | ||
2277c7cd RH |
2249 | /* Update socket peer label if first association. */ |
2250 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
b6631c60 NE |
2251 | chunk->skb)) { |
2252 | sctp_association_free(new_asoc); | |
2277c7cd | 2253 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
b6631c60 | 2254 | } |
2277c7cd | 2255 | |
7e062977 XL |
2256 | /* Set temp so that it won't be added into hashtable */ |
2257 | new_asoc->temp = 1; | |
2258 | ||
1da177e4 LT |
2259 | /* Compare the tie_tag in cookie with the verification tag of |
2260 | * current association. | |
2261 | */ | |
2262 | action = sctp_tietags_compare(new_asoc, asoc); | |
2263 | ||
2264 | switch (action) { | |
2265 | case 'A': /* Association restart. */ | |
24cb81a6 | 2266 | retval = sctp_sf_do_dupcook_a(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2267 | new_asoc); |
2268 | break; | |
2269 | ||
2270 | case 'B': /* Collision case B. */ | |
24cb81a6 | 2271 | retval = sctp_sf_do_dupcook_b(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2272 | new_asoc); |
2273 | break; | |
2274 | ||
2275 | case 'C': /* Collision case C. */ | |
24cb81a6 | 2276 | retval = sctp_sf_do_dupcook_c(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2277 | new_asoc); |
2278 | break; | |
2279 | ||
2280 | case 'D': /* Collision case D. */ | |
24cb81a6 | 2281 | retval = sctp_sf_do_dupcook_d(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2282 | new_asoc); |
2283 | break; | |
2284 | ||
2285 | default: /* Discard packet for all others. */ | |
24cb81a6 | 2286 | retval = sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2287 | break; |
3ff50b79 | 2288 | } |
1da177e4 | 2289 | |
fb373c84 | 2290 | /* Delete the temporary new association. */ |
f2815633 | 2291 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, SCTP_ASOC(new_asoc)); |
1da177e4 LT |
2292 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
2293 | ||
fb373c84 | 2294 | /* Restore association pointer to provide SCTP command interpreter |
d5ccd496 MM |
2295 | * with a valid context in case it needs to manipulate |
2296 | * the queues */ | |
2297 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, | |
2298 | SCTP_ASOC((struct sctp_association *)asoc)); | |
2299 | ||
1da177e4 LT |
2300 | return retval; |
2301 | ||
2302 | nomem: | |
2303 | return SCTP_DISPOSITION_NOMEM; | |
2304 | } | |
2305 | ||
2306 | /* | |
2307 | * Process an ABORT. (SHUTDOWN-PENDING state) | |
2308 | * | |
2309 | * See sctp_sf_do_9_1_abort(). | |
2310 | */ | |
172a1599 XL |
2311 | enum sctp_disposition sctp_sf_shutdown_pending_abort( |
2312 | struct net *net, | |
2313 | const struct sctp_endpoint *ep, | |
2314 | const struct sctp_association *asoc, | |
2315 | const union sctp_subtype type, | |
2316 | void *arg, | |
2317 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2318 | { |
2319 | struct sctp_chunk *chunk = arg; | |
2320 | ||
2321 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2322 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2323 | |
2324 | /* Make sure that the ABORT chunk has a valid length. | |
2325 | * Since this is an ABORT chunk, we have to discard it | |
2326 | * because of the following text: | |
2327 | * RFC 2960, Section 3.3.7 | |
2328 | * If an endpoint receives an ABORT with a format error or for an | |
2329 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2330 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2331 | * as we do not know its true length. So, to be safe, discard the |
2332 | * packet. | |
2333 | */ | |
441ae65a | 2334 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2335 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2336 | |
75205f47 VY |
2337 | /* ADD-IP: Special case for ABORT chunks |
2338 | * F4) One special consideration is that ABORT Chunks arriving | |
2339 | * destined to the IP address being deleted MUST be | |
2340 | * ignored (see Section 5.3.1 for further details). | |
2341 | */ | |
2342 | if (SCTP_ADDR_DEL == | |
2343 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2344 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2345 | |
245709ec XL |
2346 | if (!sctp_err_chunk_valid(chunk)) |
2347 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2348 | ||
24cb81a6 | 2349 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2350 | } |
2351 | ||
2352 | /* | |
2353 | * Process an ABORT. (SHUTDOWN-SENT state) | |
2354 | * | |
2355 | * See sctp_sf_do_9_1_abort(). | |
2356 | */ | |
172a1599 XL |
2357 | enum sctp_disposition sctp_sf_shutdown_sent_abort( |
2358 | struct net *net, | |
24cb81a6 | 2359 | const struct sctp_endpoint *ep, |
1da177e4 | 2360 | const struct sctp_association *asoc, |
bfc6f827 | 2361 | const union sctp_subtype type, |
1da177e4 | 2362 | void *arg, |
a85bbeb2 | 2363 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2364 | { |
2365 | struct sctp_chunk *chunk = arg; | |
2366 | ||
2367 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2368 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2369 | |
2370 | /* Make sure that the ABORT chunk has a valid length. | |
2371 | * Since this is an ABORT chunk, we have to discard it | |
2372 | * because of the following text: | |
2373 | * RFC 2960, Section 3.3.7 | |
2374 | * If an endpoint receives an ABORT with a format error or for an | |
2375 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2376 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2377 | * as we do not know its true length. So, to be safe, discard the |
2378 | * packet. | |
2379 | */ | |
441ae65a | 2380 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2381 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2382 | |
75205f47 VY |
2383 | /* ADD-IP: Special case for ABORT chunks |
2384 | * F4) One special consideration is that ABORT Chunks arriving | |
2385 | * destined to the IP address being deleted MUST be | |
2386 | * ignored (see Section 5.3.1 for further details). | |
2387 | */ | |
2388 | if (SCTP_ADDR_DEL == | |
2389 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2390 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2391 | |
245709ec XL |
2392 | if (!sctp_err_chunk_valid(chunk)) |
2393 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2394 | ||
1da177e4 LT |
2395 | /* Stop the T2-shutdown timer. */ |
2396 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2397 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2398 | ||
2399 | /* Stop the T5-shutdown guard timer. */ | |
2400 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2401 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
2402 | ||
24cb81a6 | 2403 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2404 | } |
2405 | ||
2406 | /* | |
2407 | * Process an ABORT. (SHUTDOWN-ACK-SENT state) | |
2408 | * | |
2409 | * See sctp_sf_do_9_1_abort(). | |
2410 | */ | |
172a1599 XL |
2411 | enum sctp_disposition sctp_sf_shutdown_ack_sent_abort( |
2412 | struct net *net, | |
2413 | const struct sctp_endpoint *ep, | |
2414 | const struct sctp_association *asoc, | |
2415 | const union sctp_subtype type, | |
2416 | void *arg, | |
2417 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2418 | { |
2419 | /* The same T2 timer, so we should be able to use | |
2420 | * common function with the SHUTDOWN-SENT state. | |
2421 | */ | |
24cb81a6 | 2422 | return sctp_sf_shutdown_sent_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2423 | } |
2424 | ||
2425 | /* | |
2426 | * Handle an Error received in COOKIE_ECHOED state. | |
2427 | * | |
2428 | * Only handle the error type of stale COOKIE Error, the other errors will | |
2429 | * be ignored. | |
2430 | * | |
2431 | * Inputs | |
2432 | * (endpoint, asoc, chunk) | |
2433 | * | |
2434 | * Outputs | |
2435 | * (asoc, reply_msg, msg_up, timers, counters) | |
2436 | * | |
2437 | * The return value is the disposition of the chunk. | |
2438 | */ | |
172a1599 XL |
2439 | enum sctp_disposition sctp_sf_cookie_echoed_err( |
2440 | struct net *net, | |
24cb81a6 | 2441 | const struct sctp_endpoint *ep, |
1da177e4 | 2442 | const struct sctp_association *asoc, |
bfc6f827 | 2443 | const union sctp_subtype type, |
1da177e4 | 2444 | void *arg, |
a85bbeb2 | 2445 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2446 | { |
2447 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 2448 | struct sctp_errhdr *err; |
1da177e4 LT |
2449 | |
2450 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2451 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2452 | |
2453 | /* Make sure that the ERROR chunk has a valid length. | |
2454 | * The parameter walking depends on this as well. | |
2455 | */ | |
87caeba7 | 2456 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 2457 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2458 | commands); |
2459 | ||
2460 | /* Process the error here */ | |
2461 | /* FUTURE FIXME: When PR-SCTP related and other optional | |
2462 | * parms are emitted, this will have to change to handle multiple | |
2463 | * errors. | |
2464 | */ | |
2465 | sctp_walk_errors(err, chunk->chunk_hdr) { | |
2466 | if (SCTP_ERROR_STALE_COOKIE == err->cause) | |
24cb81a6 | 2467 | return sctp_sf_do_5_2_6_stale(net, ep, asoc, type, |
1da177e4 LT |
2468 | arg, commands); |
2469 | } | |
2470 | ||
2471 | /* It is possible to have malformed error causes, and that | |
2472 | * will cause us to end the walk early. However, since | |
2473 | * we are discarding the packet, there should be no adverse | |
2474 | * affects. | |
2475 | */ | |
24cb81a6 | 2476 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2477 | } |
2478 | ||
2479 | /* | |
2480 | * Handle a Stale COOKIE Error | |
2481 | * | |
2482 | * Section: 5.2.6 Handle Stale COOKIE Error | |
2483 | * If the association is in the COOKIE-ECHOED state, the endpoint may elect | |
2484 | * one of the following three alternatives. | |
2485 | * ... | |
2486 | * 3) Send a new INIT chunk to the endpoint, adding a Cookie | |
2487 | * Preservative parameter requesting an extension to the lifetime of | |
2488 | * the State Cookie. When calculating the time extension, an | |
2489 | * implementation SHOULD use the RTT information measured based on the | |
2490 | * previous COOKIE ECHO / ERROR exchange, and should add no more | |
2491 | * than 1 second beyond the measured RTT, due to long State Cookie | |
2492 | * lifetimes making the endpoint more subject to a replay attack. | |
2493 | * | |
2494 | * Verification Tag: Not explicit, but safe to ignore. | |
2495 | * | |
2496 | * Inputs | |
2497 | * (endpoint, asoc, chunk) | |
2498 | * | |
2499 | * Outputs | |
2500 | * (asoc, reply_msg, msg_up, timers, counters) | |
2501 | * | |
2502 | * The return value is the disposition of the chunk. | |
2503 | */ | |
172a1599 XL |
2504 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
2505 | struct net *net, | |
2506 | const struct sctp_endpoint *ep, | |
2507 | const struct sctp_association *asoc, | |
2508 | const union sctp_subtype type, | |
2509 | void *arg, | |
2510 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2511 | { |
3f7a87d2 | 2512 | int attempts = asoc->init_err_counter + 1; |
365ddb65 XL |
2513 | struct sctp_chunk *chunk = arg, *reply; |
2514 | struct sctp_cookie_preserve_param bht; | |
2515 | struct sctp_bind_addr *bp; | |
d8238d9d | 2516 | struct sctp_errhdr *err; |
365ddb65 | 2517 | u32 stale; |
1da177e4 | 2518 | |
81845c21 | 2519 | if (attempts > asoc->max_init_attempts) { |
8de8c873 SS |
2520 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
2521 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 2522 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 2523 | SCTP_PERR(SCTP_ERROR_STALE_COOKIE)); |
1da177e4 LT |
2524 | return SCTP_DISPOSITION_DELETE_TCB; |
2525 | } | |
2526 | ||
d8238d9d | 2527 | err = (struct sctp_errhdr *)(chunk->skb->data); |
1da177e4 LT |
2528 | |
2529 | /* When calculating the time extension, an implementation | |
2530 | * SHOULD use the RTT information measured based on the | |
2531 | * previous COOKIE ECHO / ERROR exchange, and should add no | |
2532 | * more than 1 second beyond the measured RTT, due to long | |
2533 | * State Cookie lifetimes making the endpoint more subject to | |
2534 | * a replay attack. | |
2535 | * Measure of Staleness's unit is usec. (1/1000000 sec) | |
2536 | * Suggested Cookie Life-span Increment's unit is msec. | |
2537 | * (1/1000 sec) | |
2538 | * In general, if you use the suggested cookie life, the value | |
2539 | * found in the field of measure of staleness should be doubled | |
2540 | * to give ample time to retransmit the new cookie and thus | |
2541 | * yield a higher probability of success on the reattempt. | |
2542 | */ | |
d8238d9d | 2543 | stale = ntohl(*(__be32 *)((u8 *)err + sizeof(*err))); |
1da177e4 LT |
2544 | stale = (stale * 2) / 1000; |
2545 | ||
2546 | bht.param_hdr.type = SCTP_PARAM_COOKIE_PRESERVATIVE; | |
2547 | bht.param_hdr.length = htons(sizeof(bht)); | |
2548 | bht.lifespan_increment = htonl(stale); | |
2549 | ||
2550 | /* Build that new INIT chunk. */ | |
2551 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; | |
2552 | reply = sctp_make_init(asoc, bp, GFP_ATOMIC, sizeof(bht)); | |
2553 | if (!reply) | |
2554 | goto nomem; | |
2555 | ||
2556 | sctp_addto_chunk(reply, sizeof(bht), &bht); | |
2557 | ||
2558 | /* Clear peer's init_tag cached in assoc as we are sending a new INIT */ | |
2559 | sctp_add_cmd_sf(commands, SCTP_CMD_CLEAR_INIT_TAG, SCTP_NULL()); | |
2560 | ||
2561 | /* Stop pending T3-rtx and heartbeat timers */ | |
2562 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); | |
2563 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
2564 | ||
2565 | /* Delete non-primary peer ip addresses since we are transitioning | |
2566 | * back to the COOKIE-WAIT state | |
2567 | */ | |
2568 | sctp_add_cmd_sf(commands, SCTP_CMD_DEL_NON_PRIMARY, SCTP_NULL()); | |
2569 | ||
d808ad9a YH |
2570 | /* If we've sent any data bundled with COOKIE-ECHO we will need to |
2571 | * resend | |
1da177e4 | 2572 | */ |
b6157d8e | 2573 | sctp_add_cmd_sf(commands, SCTP_CMD_T1_RETRAN, |
1da177e4 LT |
2574 | SCTP_TRANSPORT(asoc->peer.primary_path)); |
2575 | ||
2576 | /* Cast away the const modifier, as we want to just | |
2577 | * rerun it through as a sideffect. | |
2578 | */ | |
3f7a87d2 | 2579 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_INC, SCTP_NULL()); |
1da177e4 LT |
2580 | |
2581 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2582 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2583 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2584 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
2585 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
2586 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
2587 | ||
2588 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2589 | ||
2590 | return SCTP_DISPOSITION_CONSUME; | |
2591 | ||
2592 | nomem: | |
2593 | return SCTP_DISPOSITION_NOMEM; | |
2594 | } | |
2595 | ||
2596 | /* | |
2597 | * Process an ABORT. | |
2598 | * | |
2599 | * Section: 9.1 | |
2600 | * After checking the Verification Tag, the receiving endpoint shall | |
2601 | * remove the association from its record, and shall report the | |
2602 | * termination to its upper layer. | |
2603 | * | |
2604 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
2605 | * B) Rules for packet carrying ABORT: | |
2606 | * | |
2607 | * - The endpoint shall always fill in the Verification Tag field of the | |
2608 | * outbound packet with the destination endpoint's tag value if it | |
2609 | * is known. | |
2610 | * | |
2611 | * - If the ABORT is sent in response to an OOTB packet, the endpoint | |
2612 | * MUST follow the procedure described in Section 8.4. | |
2613 | * | |
2614 | * - The receiver MUST accept the packet if the Verification Tag | |
2615 | * matches either its own tag, OR the tag of its peer. Otherwise, the | |
2616 | * receiver MUST silently discard the packet and take no further | |
2617 | * action. | |
2618 | * | |
2619 | * Inputs | |
2620 | * (endpoint, asoc, chunk) | |
2621 | * | |
2622 | * Outputs | |
2623 | * (asoc, reply_msg, msg_up, timers, counters) | |
2624 | * | |
2625 | * The return value is the disposition of the chunk. | |
2626 | */ | |
172a1599 XL |
2627 | enum sctp_disposition sctp_sf_do_9_1_abort( |
2628 | struct net *net, | |
24cb81a6 | 2629 | const struct sctp_endpoint *ep, |
1da177e4 | 2630 | const struct sctp_association *asoc, |
bfc6f827 | 2631 | const union sctp_subtype type, |
1da177e4 | 2632 | void *arg, |
a85bbeb2 | 2633 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2634 | { |
2635 | struct sctp_chunk *chunk = arg; | |
1da177e4 LT |
2636 | |
2637 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2638 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2639 | |
2640 | /* Make sure that the ABORT chunk has a valid length. | |
2641 | * Since this is an ABORT chunk, we have to discard it | |
2642 | * because of the following text: | |
2643 | * RFC 2960, Section 3.3.7 | |
2644 | * If an endpoint receives an ABORT with a format error or for an | |
2645 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2646 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2647 | * as we do not know its true length. So, to be safe, discard the |
2648 | * packet. | |
2649 | */ | |
441ae65a | 2650 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2651 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2652 | |
75205f47 VY |
2653 | /* ADD-IP: Special case for ABORT chunks |
2654 | * F4) One special consideration is that ABORT Chunks arriving | |
2655 | * destined to the IP address being deleted MUST be | |
2656 | * ignored (see Section 5.3.1 for further details). | |
2657 | */ | |
2658 | if (SCTP_ADDR_DEL == | |
2659 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2660 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2661 | |
245709ec XL |
2662 | if (!sctp_err_chunk_valid(chunk)) |
2663 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2664 | ||
24cb81a6 | 2665 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
75205f47 VY |
2666 | } |
2667 | ||
172a1599 XL |
2668 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
2669 | struct net *net, | |
24cb81a6 | 2670 | const struct sctp_endpoint *ep, |
75205f47 | 2671 | const struct sctp_association *asoc, |
bfc6f827 | 2672 | const union sctp_subtype type, |
75205f47 | 2673 | void *arg, |
a85bbeb2 | 2674 | struct sctp_cmd_seq *commands) |
75205f47 | 2675 | { |
172a1599 | 2676 | __be16 error = SCTP_ERROR_NO_ERROR; |
75205f47 | 2677 | struct sctp_chunk *chunk = arg; |
95c96174 | 2678 | unsigned int len; |
75205f47 | 2679 | |
1da177e4 LT |
2680 | /* See if we have an error cause code in the chunk. */ |
2681 | len = ntohs(chunk->chunk_hdr->length); | |
245709ec | 2682 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) |
d8238d9d | 2683 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
1da177e4 | 2684 | |
8de8c873 | 2685 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNRESET)); |
d808ad9a | 2686 | /* ASSOC_FAILED will DELETE_TCB. */ |
5be291fe | 2687 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(error)); |
b01a2407 EB |
2688 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
2689 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
2690 | |
2691 | return SCTP_DISPOSITION_ABORT; | |
2692 | } | |
2693 | ||
2694 | /* | |
2695 | * Process an ABORT. (COOKIE-WAIT state) | |
2696 | * | |
2697 | * See sctp_sf_do_9_1_abort() above. | |
2698 | */ | |
172a1599 XL |
2699 | enum sctp_disposition sctp_sf_cookie_wait_abort( |
2700 | struct net *net, | |
2701 | const struct sctp_endpoint *ep, | |
2702 | const struct sctp_association *asoc, | |
2703 | const union sctp_subtype type, | |
2704 | void *arg, | |
2705 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2706 | { |
172a1599 | 2707 | __be16 error = SCTP_ERROR_NO_ERROR; |
1da177e4 | 2708 | struct sctp_chunk *chunk = arg; |
95c96174 | 2709 | unsigned int len; |
1da177e4 LT |
2710 | |
2711 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2712 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2713 | |
2714 | /* Make sure that the ABORT chunk has a valid length. | |
2715 | * Since this is an ABORT chunk, we have to discard it | |
2716 | * because of the following text: | |
2717 | * RFC 2960, Section 3.3.7 | |
2718 | * If an endpoint receives an ABORT with a format error or for an | |
2719 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2720 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2721 | * as we do not know its true length. So, to be safe, discard the |
2722 | * packet. | |
2723 | */ | |
441ae65a | 2724 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2725 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2726 | |
2727 | /* See if we have an error cause code in the chunk. */ | |
2728 | len = ntohs(chunk->chunk_hdr->length); | |
2729 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) | |
d8238d9d | 2730 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
1da177e4 | 2731 | |
24cb81a6 | 2732 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, asoc, |
8de8c873 | 2733 | chunk->transport); |
1da177e4 LT |
2734 | } |
2735 | ||
2736 | /* | |
2737 | * Process an incoming ICMP as an ABORT. (COOKIE-WAIT state) | |
2738 | */ | |
172a1599 XL |
2739 | enum sctp_disposition sctp_sf_cookie_wait_icmp_abort( |
2740 | struct net *net, | |
24cb81a6 | 2741 | const struct sctp_endpoint *ep, |
1da177e4 | 2742 | const struct sctp_association *asoc, |
bfc6f827 | 2743 | const union sctp_subtype type, |
1da177e4 | 2744 | void *arg, |
a85bbeb2 | 2745 | struct sctp_cmd_seq *commands) |
1da177e4 | 2746 | { |
24cb81a6 | 2747 | return sctp_stop_t1_and_abort(net, commands, SCTP_ERROR_NO_ERROR, |
8de8c873 | 2748 | ENOPROTOOPT, asoc, |
3f7a87d2 | 2749 | (struct sctp_transport *)arg); |
1da177e4 LT |
2750 | } |
2751 | ||
2752 | /* | |
2753 | * Process an ABORT. (COOKIE-ECHOED state) | |
2754 | */ | |
172a1599 XL |
2755 | enum sctp_disposition sctp_sf_cookie_echoed_abort( |
2756 | struct net *net, | |
2757 | const struct sctp_endpoint *ep, | |
2758 | const struct sctp_association *asoc, | |
2759 | const union sctp_subtype type, | |
2760 | void *arg, | |
2761 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2762 | { |
2763 | /* There is a single T1 timer, so we should be able to use | |
2764 | * common function with the COOKIE-WAIT state. | |
2765 | */ | |
24cb81a6 | 2766 | return sctp_sf_cookie_wait_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2767 | } |
2768 | ||
2769 | /* | |
2770 | * Stop T1 timer and abort association with "INIT failed". | |
2771 | * | |
2772 | * This is common code called by several sctp_sf_*_abort() functions above. | |
2773 | */ | |
172a1599 XL |
2774 | static enum sctp_disposition sctp_stop_t1_and_abort( |
2775 | struct net *net, | |
2776 | struct sctp_cmd_seq *commands, | |
2777 | __be16 error, int sk_err, | |
2778 | const struct sctp_association *asoc, | |
2779 | struct sctp_transport *transport) | |
1da177e4 | 2780 | { |
bb33381d DB |
2781 | pr_debug("%s: ABORT received (INIT)\n", __func__); |
2782 | ||
1da177e4 LT |
2783 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
2784 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
24cb81a6 | 2785 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
2786 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
2787 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
8de8c873 | 2788 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(sk_err)); |
1da177e4 LT |
2789 | /* CMD_INIT_FAILED will DELETE_TCB. */ |
2790 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 2791 | SCTP_PERR(error)); |
bb33381d | 2792 | |
3f7a87d2 | 2793 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
2794 | } |
2795 | ||
2796 | /* | |
2797 | * sctp_sf_do_9_2_shut | |
2798 | * | |
2799 | * Section: 9.2 | |
2800 | * Upon the reception of the SHUTDOWN, the peer endpoint shall | |
2801 | * - enter the SHUTDOWN-RECEIVED state, | |
2802 | * | |
2803 | * - stop accepting new data from its SCTP user | |
2804 | * | |
2805 | * - verify, by checking the Cumulative TSN Ack field of the chunk, | |
2806 | * that all its outstanding DATA chunks have been received by the | |
2807 | * SHUTDOWN sender. | |
2808 | * | |
2809 | * Once an endpoint as reached the SHUTDOWN-RECEIVED state it MUST NOT | |
2810 | * send a SHUTDOWN in response to a ULP request. And should discard | |
2811 | * subsequent SHUTDOWN chunks. | |
2812 | * | |
2813 | * If there are still outstanding DATA chunks left, the SHUTDOWN | |
2814 | * receiver shall continue to follow normal data transmission | |
2815 | * procedures defined in Section 6 until all outstanding DATA chunks | |
2816 | * are acknowledged; however, the SHUTDOWN receiver MUST NOT accept | |
2817 | * new data from its SCTP user. | |
2818 | * | |
2819 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2820 | * | |
2821 | * Inputs | |
2822 | * (endpoint, asoc, chunk) | |
2823 | * | |
2824 | * Outputs | |
2825 | * (asoc, reply_msg, msg_up, timers, counters) | |
2826 | * | |
2827 | * The return value is the disposition of the chunk. | |
2828 | */ | |
172a1599 XL |
2829 | enum sctp_disposition sctp_sf_do_9_2_shutdown( |
2830 | struct net *net, | |
2831 | const struct sctp_endpoint *ep, | |
2832 | const struct sctp_association *asoc, | |
2833 | const union sctp_subtype type, | |
2834 | void *arg, | |
2835 | struct sctp_cmd_seq *commands) | |
2836 | { | |
2837 | enum sctp_disposition disposition; | |
1da177e4 | 2838 | struct sctp_chunk *chunk = arg; |
e61e4055 | 2839 | struct sctp_shutdownhdr *sdh; |
1da177e4 | 2840 | struct sctp_ulpevent *ev; |
df10eec4 | 2841 | __u32 ctsn; |
1da177e4 LT |
2842 | |
2843 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2844 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2845 | |
2846 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2847 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2848 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2849 | commands); |
2850 | ||
2851 | /* Convert the elaborate header. */ | |
e61e4055 XL |
2852 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
2853 | skb_pull(chunk->skb, sizeof(*sdh)); | |
1da177e4 | 2854 | chunk->subh.shutdown_hdr = sdh; |
df10eec4 WY |
2855 | ctsn = ntohl(sdh->cum_tsn_ack); |
2856 | ||
a2f36eec | 2857 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { |
bb33381d DB |
2858 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2859 | asoc->ctsn_ack_point); | |
2860 | ||
a2f36eec WY |
2861 | return SCTP_DISPOSITION_DISCARD; |
2862 | } | |
2863 | ||
df10eec4 WY |
2864 | /* If Cumulative TSN Ack beyond the max tsn currently |
2865 | * send, terminating the association and respond to the | |
2866 | * sender with an ABORT. | |
2867 | */ | |
2868 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 2869 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
1da177e4 | 2870 | |
eb0e0076 SS |
2871 | /* API 5.3.1.5 SCTP_SHUTDOWN_EVENT |
2872 | * When a peer sends a SHUTDOWN, SCTP delivers this notification to | |
2873 | * inform the application that it should cease sending data. | |
2874 | */ | |
2875 | ev = sctp_ulpevent_make_shutdown_event(asoc, 0, GFP_ATOMIC); | |
2876 | if (!ev) { | |
2877 | disposition = SCTP_DISPOSITION_NOMEM; | |
d808ad9a | 2878 | goto out; |
eb0e0076 SS |
2879 | } |
2880 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
2881 | ||
1da177e4 LT |
2882 | /* Upon the reception of the SHUTDOWN, the peer endpoint shall |
2883 | * - enter the SHUTDOWN-RECEIVED state, | |
2884 | * - stop accepting new data from its SCTP user | |
2885 | * | |
2886 | * [This is implicit in the new state.] | |
2887 | */ | |
2888 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2889 | SCTP_STATE(SCTP_STATE_SHUTDOWN_RECEIVED)); | |
2890 | disposition = SCTP_DISPOSITION_CONSUME; | |
2891 | ||
2892 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 2893 | disposition = sctp_sf_do_9_2_shutdown_ack(net, ep, asoc, type, |
1da177e4 LT |
2894 | arg, commands); |
2895 | } | |
2896 | ||
2897 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
2898 | goto out; | |
2899 | ||
2900 | /* - verify, by checking the Cumulative TSN Ack field of the | |
2901 | * chunk, that all its outstanding DATA chunks have been | |
2902 | * received by the SHUTDOWN sender. | |
2903 | */ | |
2904 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2178eda8 | 2905 | SCTP_BE32(chunk->subh.shutdown_hdr->cum_tsn_ack)); |
1da177e4 | 2906 | |
1da177e4 LT |
2907 | out: |
2908 | return disposition; | |
2909 | } | |
2910 | ||
2e3f92da WY |
2911 | /* |
2912 | * sctp_sf_do_9_2_shut_ctsn | |
2913 | * | |
2914 | * Once an endpoint has reached the SHUTDOWN-RECEIVED state, | |
2915 | * it MUST NOT send a SHUTDOWN in response to a ULP request. | |
2916 | * The Cumulative TSN Ack of the received SHUTDOWN chunk | |
2917 | * MUST be processed. | |
2918 | */ | |
172a1599 XL |
2919 | enum sctp_disposition sctp_sf_do_9_2_shut_ctsn( |
2920 | struct net *net, | |
2921 | const struct sctp_endpoint *ep, | |
2922 | const struct sctp_association *asoc, | |
2923 | const union sctp_subtype type, | |
2924 | void *arg, | |
2925 | struct sctp_cmd_seq *commands) | |
2e3f92da WY |
2926 | { |
2927 | struct sctp_chunk *chunk = arg; | |
e61e4055 | 2928 | struct sctp_shutdownhdr *sdh; |
a2f36eec | 2929 | __u32 ctsn; |
2e3f92da WY |
2930 | |
2931 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2932 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2933 | |
2934 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2935 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2936 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
2e3f92da WY |
2937 | commands); |
2938 | ||
e61e4055 | 2939 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
a2f36eec WY |
2940 | ctsn = ntohl(sdh->cum_tsn_ack); |
2941 | ||
2942 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
2943 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2944 | asoc->ctsn_ack_point); | |
2945 | ||
a2f36eec WY |
2946 | return SCTP_DISPOSITION_DISCARD; |
2947 | } | |
2e3f92da WY |
2948 | |
2949 | /* If Cumulative TSN Ack beyond the max tsn currently | |
2950 | * send, terminating the association and respond to the | |
2951 | * sender with an ABORT. | |
2952 | */ | |
a2f36eec | 2953 | if (!TSN_lt(ctsn, asoc->next_tsn)) |
24cb81a6 | 2954 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2955 | |
2956 | /* verify, by checking the Cumulative TSN Ack field of the | |
2957 | * chunk, that all its outstanding DATA chunks have been | |
2958 | * received by the SHUTDOWN sender. | |
2959 | */ | |
2960 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2961 | SCTP_BE32(sdh->cum_tsn_ack)); | |
2962 | ||
2963 | return SCTP_DISPOSITION_CONSUME; | |
2964 | } | |
2965 | ||
1da177e4 LT |
2966 | /* RFC 2960 9.2 |
2967 | * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk | |
2968 | * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination | |
2969 | * transport addresses (either in the IP addresses or in the INIT chunk) | |
2970 | * that belong to this association, it should discard the INIT chunk and | |
2971 | * retransmit the SHUTDOWN ACK chunk. | |
2972 | */ | |
172a1599 XL |
2973 | enum sctp_disposition sctp_sf_do_9_2_reshutack( |
2974 | struct net *net, | |
2975 | const struct sctp_endpoint *ep, | |
2976 | const struct sctp_association *asoc, | |
2977 | const union sctp_subtype type, | |
2978 | void *arg, | |
2979 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2980 | { |
172a1599 | 2981 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
2982 | struct sctp_chunk *reply; |
2983 | ||
ece25dfa | 2984 | /* Make sure that the chunk has a valid length */ |
922dbc5b | 2985 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2986 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
2987 | commands); |
2988 | ||
1da177e4 | 2989 | /* Since we are not going to really process this INIT, there |
0c2c366e | 2990 | * is no point in verifying chunk boundaries. Just generate |
1da177e4 LT |
2991 | * the SHUTDOWN ACK. |
2992 | */ | |
2993 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
2994 | if (NULL == reply) | |
2995 | goto nomem; | |
2996 | ||
2997 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
2998 | * the T2-SHUTDOWN timer. | |
2999 | */ | |
3000 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
3001 | ||
3002 | /* and restart the T2-shutdown timer. */ | |
3003 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
3004 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3005 | ||
3006 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
3007 | ||
3008 | return SCTP_DISPOSITION_CONSUME; | |
3009 | nomem: | |
3010 | return SCTP_DISPOSITION_NOMEM; | |
3011 | } | |
3012 | ||
3013 | /* | |
3014 | * sctp_sf_do_ecn_cwr | |
3015 | * | |
3016 | * Section: Appendix A: Explicit Congestion Notification | |
3017 | * | |
3018 | * CWR: | |
3019 | * | |
3020 | * RFC 2481 details a specific bit for a sender to send in the header of | |
3021 | * its next outbound TCP segment to indicate to its peer that it has | |
3022 | * reduced its congestion window. This is termed the CWR bit. For | |
3023 | * SCTP the same indication is made by including the CWR chunk. | |
3024 | * This chunk contains one data element, i.e. the TSN number that | |
3025 | * was sent in the ECNE chunk. This element represents the lowest | |
3026 | * TSN number in the datagram that was originally marked with the | |
3027 | * CE bit. | |
3028 | * | |
3029 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3030 | * Inputs | |
3031 | * (endpoint, asoc, chunk) | |
3032 | * | |
3033 | * Outputs | |
3034 | * (asoc, reply_msg, msg_up, timers, counters) | |
3035 | * | |
3036 | * The return value is the disposition of the chunk. | |
3037 | */ | |
172a1599 XL |
3038 | enum sctp_disposition sctp_sf_do_ecn_cwr(struct net *net, |
3039 | const struct sctp_endpoint *ep, | |
3040 | const struct sctp_association *asoc, | |
3041 | const union sctp_subtype type, | |
3042 | void *arg, | |
3043 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3044 | { |
1da177e4 | 3045 | struct sctp_chunk *chunk = arg; |
65f77105 | 3046 | struct sctp_cwrhdr *cwr; |
34bcca28 | 3047 | u32 lowest_tsn; |
1da177e4 LT |
3048 | |
3049 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3050 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3051 | |
b515fd27 | 3052 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 3053 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3054 | commands); |
d808ad9a | 3055 | |
65f77105 XL |
3056 | cwr = (struct sctp_cwrhdr *)chunk->skb->data; |
3057 | skb_pull(chunk->skb, sizeof(*cwr)); | |
1da177e4 | 3058 | |
34bcca28 | 3059 | lowest_tsn = ntohl(cwr->lowest_tsn); |
1da177e4 LT |
3060 | |
3061 | /* Does this CWR ack the last sent congestion notification? */ | |
34bcca28 | 3062 | if (TSN_lte(asoc->last_ecne_tsn, lowest_tsn)) { |
1da177e4 LT |
3063 | /* Stop sending ECNE. */ |
3064 | sctp_add_cmd_sf(commands, | |
3065 | SCTP_CMD_ECN_CWR, | |
34bcca28 | 3066 | SCTP_U32(lowest_tsn)); |
1da177e4 LT |
3067 | } |
3068 | return SCTP_DISPOSITION_CONSUME; | |
3069 | } | |
3070 | ||
3071 | /* | |
3072 | * sctp_sf_do_ecne | |
3073 | * | |
3074 | * Section: Appendix A: Explicit Congestion Notification | |
3075 | * | |
3076 | * ECN-Echo | |
3077 | * | |
3078 | * RFC 2481 details a specific bit for a receiver to send back in its | |
3079 | * TCP acknowledgements to notify the sender of the Congestion | |
3080 | * Experienced (CE) bit having arrived from the network. For SCTP this | |
3081 | * same indication is made by including the ECNE chunk. This chunk | |
3082 | * contains one data element, i.e. the lowest TSN associated with the IP | |
3083 | * datagram marked with the CE bit..... | |
3084 | * | |
3085 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3086 | * Inputs | |
3087 | * (endpoint, asoc, chunk) | |
3088 | * | |
3089 | * Outputs | |
3090 | * (asoc, reply_msg, msg_up, timers, counters) | |
3091 | * | |
3092 | * The return value is the disposition of the chunk. | |
3093 | */ | |
172a1599 XL |
3094 | enum sctp_disposition sctp_sf_do_ecne(struct net *net, |
3095 | const struct sctp_endpoint *ep, | |
3096 | const struct sctp_association *asoc, | |
3097 | const union sctp_subtype type, | |
3098 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 3099 | { |
1da177e4 | 3100 | struct sctp_chunk *chunk = arg; |
1fb6d83b | 3101 | struct sctp_ecnehdr *ecne; |
1da177e4 LT |
3102 | |
3103 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3104 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3105 | |
b515fd27 | 3106 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 3107 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3108 | commands); |
3109 | ||
1fb6d83b XL |
3110 | ecne = (struct sctp_ecnehdr *)chunk->skb->data; |
3111 | skb_pull(chunk->skb, sizeof(*ecne)); | |
1da177e4 LT |
3112 | |
3113 | /* If this is a newer ECNE than the last CWR packet we sent out */ | |
3114 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_ECNE, | |
3115 | SCTP_U32(ntohl(ecne->lowest_tsn))); | |
3116 | ||
3117 | return SCTP_DISPOSITION_CONSUME; | |
3118 | } | |
3119 | ||
3120 | /* | |
3121 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
3122 | * | |
3123 | * The SCTP endpoint MUST always acknowledge the reception of each valid | |
3124 | * DATA chunk. | |
3125 | * | |
3126 | * The guidelines on delayed acknowledgement algorithm specified in | |
3127 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
3128 | * acknowledgement SHOULD be generated for at least every second packet | |
3129 | * (not every second DATA chunk) received, and SHOULD be generated within | |
3130 | * 200 ms of the arrival of any unacknowledged DATA chunk. In some | |
3131 | * situations it may be beneficial for an SCTP transmitter to be more | |
3132 | * conservative than the algorithms detailed in this document allow. | |
3133 | * However, an SCTP transmitter MUST NOT be more aggressive than the | |
3134 | * following algorithms allow. | |
3135 | * | |
3136 | * A SCTP receiver MUST NOT generate more than one SACK for every | |
3137 | * incoming packet, other than to update the offered window as the | |
3138 | * receiving application consumes new data. | |
3139 | * | |
3140 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3141 | * | |
3142 | * Inputs | |
3143 | * (endpoint, asoc, chunk) | |
3144 | * | |
3145 | * Outputs | |
3146 | * (asoc, reply_msg, msg_up, timers, counters) | |
3147 | * | |
3148 | * The return value is the disposition of the chunk. | |
3149 | */ | |
172a1599 XL |
3150 | enum sctp_disposition sctp_sf_eat_data_6_2(struct net *net, |
3151 | const struct sctp_endpoint *ep, | |
3152 | const struct sctp_association *asoc, | |
3153 | const union sctp_subtype type, | |
3154 | void *arg, | |
3155 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3156 | { |
c488b770 | 3157 | union sctp_arg force = SCTP_NOFORCE(); |
1da177e4 LT |
3158 | struct sctp_chunk *chunk = arg; |
3159 | int error; | |
3160 | ||
3161 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3162 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3163 | SCTP_NULL()); | |
24cb81a6 | 3164 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3165 | } |
1da177e4 | 3166 | |
9d4ceaf1 | 3167 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3168 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3169 | commands); |
3170 | ||
cb3f837b | 3171 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3172 | switch (error) { |
3173 | case SCTP_IERROR_NO_ERROR: | |
3174 | break; | |
3175 | case SCTP_IERROR_HIGH_TSN: | |
3176 | case SCTP_IERROR_BAD_STREAM: | |
24cb81a6 | 3177 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3178 | goto discard_noforce; |
3179 | case SCTP_IERROR_DUP_TSN: | |
3180 | case SCTP_IERROR_IGNORE_TSN: | |
24cb81a6 | 3181 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3182 | goto discard_force; |
3183 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3184 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3185 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3186 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3187 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3188 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3189 | default: |
3190 | BUG(); | |
3191 | } | |
3192 | ||
6dc7694f WY |
3193 | if (chunk->chunk_hdr->flags & SCTP_DATA_SACK_IMM) |
3194 | force = SCTP_FORCE(); | |
3195 | ||
9f70f46b | 3196 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
3197 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
3198 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
3199 | } | |
3200 | ||
3201 | /* If this is the last chunk in a packet, we need to count it | |
3202 | * toward sack generation. Note that we need to SACK every | |
3203 | * OTHER packet containing data chunks, EVEN IF WE DISCARD | |
3204 | * THEM. We elect to NOT generate SACK's if the chunk fails | |
3205 | * the verification tag test. | |
3206 | * | |
3207 | * RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3208 | * | |
3209 | * The SCTP endpoint MUST always acknowledge the reception of | |
3210 | * each valid DATA chunk. | |
3211 | * | |
3212 | * The guidelines on delayed acknowledgement algorithm | |
3213 | * specified in Section 4.2 of [RFC2581] SHOULD be followed. | |
3214 | * Specifically, an acknowledgement SHOULD be generated for at | |
3215 | * least every second packet (not every second DATA chunk) | |
3216 | * received, and SHOULD be generated within 200 ms of the | |
3217 | * arrival of any unacknowledged DATA chunk. In some | |
3218 | * situations it may be beneficial for an SCTP transmitter to | |
3219 | * be more conservative than the algorithms detailed in this | |
3220 | * document allow. However, an SCTP transmitter MUST NOT be | |
3221 | * more aggressive than the following algorithms allow. | |
3222 | */ | |
52ccb8e9 | 3223 | if (chunk->end_of_packet) |
6dc7694f | 3224 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3225 | |
1da177e4 LT |
3226 | return SCTP_DISPOSITION_CONSUME; |
3227 | ||
3228 | discard_force: | |
3229 | /* RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3230 | * | |
3231 | * When a packet arrives with duplicate DATA chunk(s) and with | |
3232 | * no new DATA chunk(s), the endpoint MUST immediately send a | |
3233 | * SACK with no delay. If a packet arrives with duplicate | |
3234 | * DATA chunk(s) bundled with new DATA chunks, the endpoint | |
3235 | * MAY immediately send a SACK. Normally receipt of duplicate | |
3236 | * DATA chunks will occur when the original SACK chunk was lost | |
3237 | * and the peer's RTO has expired. The duplicate TSN number(s) | |
3238 | * SHOULD be reported in the SACK as duplicate. | |
3239 | */ | |
3240 | /* In our case, we split the MAY SACK advice up whether or not | |
3241 | * the last chunk is a duplicate.' | |
3242 | */ | |
3243 | if (chunk->end_of_packet) | |
3244 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3245 | return SCTP_DISPOSITION_DISCARD; | |
3246 | ||
3247 | discard_noforce: | |
52ccb8e9 | 3248 | if (chunk->end_of_packet) |
6dc7694f | 3249 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3250 | |
1da177e4 | 3251 | return SCTP_DISPOSITION_DISCARD; |
1da177e4 LT |
3252 | } |
3253 | ||
3254 | /* | |
3255 | * sctp_sf_eat_data_fast_4_4 | |
3256 | * | |
3257 | * Section: 4 (4) | |
3258 | * (4) In SHUTDOWN-SENT state the endpoint MUST acknowledge any received | |
3259 | * DATA chunks without delay. | |
3260 | * | |
3261 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3262 | * Inputs | |
3263 | * (endpoint, asoc, chunk) | |
3264 | * | |
3265 | * Outputs | |
3266 | * (asoc, reply_msg, msg_up, timers, counters) | |
3267 | * | |
3268 | * The return value is the disposition of the chunk. | |
3269 | */ | |
172a1599 XL |
3270 | enum sctp_disposition sctp_sf_eat_data_fast_4_4( |
3271 | struct net *net, | |
3272 | const struct sctp_endpoint *ep, | |
3273 | const struct sctp_association *asoc, | |
3274 | const union sctp_subtype type, | |
3275 | void *arg, | |
3276 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3277 | { |
3278 | struct sctp_chunk *chunk = arg; | |
3279 | int error; | |
3280 | ||
3281 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3282 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3283 | SCTP_NULL()); | |
24cb81a6 | 3284 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3285 | } |
3286 | ||
9d4ceaf1 | 3287 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3288 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3289 | commands); |
3290 | ||
cb3f837b | 3291 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3292 | switch (error) { |
3293 | case SCTP_IERROR_NO_ERROR: | |
3294 | case SCTP_IERROR_HIGH_TSN: | |
3295 | case SCTP_IERROR_DUP_TSN: | |
3296 | case SCTP_IERROR_IGNORE_TSN: | |
3297 | case SCTP_IERROR_BAD_STREAM: | |
3298 | break; | |
3299 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3300 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3301 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3302 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3303 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3304 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3305 | default: |
3306 | BUG(); | |
3307 | } | |
3308 | ||
3309 | /* Go a head and force a SACK, since we are shutting down. */ | |
3310 | ||
3311 | /* Implementor's Guide. | |
3312 | * | |
3313 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
3314 | * respond to each received packet containing one or more DATA chunk(s) | |
3315 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
3316 | */ | |
3317 | if (chunk->end_of_packet) { | |
3318 | /* We must delay the chunk creation since the cumulative | |
3319 | * TSN has not been updated yet. | |
3320 | */ | |
3321 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
3322 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3323 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
3324 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3325 | } | |
3326 | ||
1da177e4 LT |
3327 | return SCTP_DISPOSITION_CONSUME; |
3328 | } | |
3329 | ||
3330 | /* | |
3331 | * Section: 6.2 Processing a Received SACK | |
3332 | * D) Any time a SACK arrives, the endpoint performs the following: | |
3333 | * | |
3334 | * i) If Cumulative TSN Ack is less than the Cumulative TSN Ack Point, | |
3335 | * then drop the SACK. Since Cumulative TSN Ack is monotonically | |
3336 | * increasing, a SACK whose Cumulative TSN Ack is less than the | |
3337 | * Cumulative TSN Ack Point indicates an out-of-order SACK. | |
3338 | * | |
3339 | * ii) Set rwnd equal to the newly received a_rwnd minus the number | |
3340 | * of bytes still outstanding after processing the Cumulative TSN Ack | |
3341 | * and the Gap Ack Blocks. | |
3342 | * | |
3343 | * iii) If the SACK is missing a TSN that was previously | |
3344 | * acknowledged via a Gap Ack Block (e.g., the data receiver | |
3345 | * reneged on the data), then mark the corresponding DATA chunk | |
3346 | * as available for retransmit: Mark it as missing for fast | |
3347 | * retransmit as described in Section 7.2.4 and if no retransmit | |
3348 | * timer is running for the destination address to which the DATA | |
3349 | * chunk was originally transmitted, then T3-rtx is started for | |
3350 | * that destination address. | |
3351 | * | |
3352 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3353 | * | |
3354 | * Inputs | |
3355 | * (endpoint, asoc, chunk) | |
3356 | * | |
3357 | * Outputs | |
3358 | * (asoc, reply_msg, msg_up, timers, counters) | |
3359 | * | |
3360 | * The return value is the disposition of the chunk. | |
3361 | */ | |
172a1599 XL |
3362 | enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net, |
3363 | const struct sctp_endpoint *ep, | |
3364 | const struct sctp_association *asoc, | |
3365 | const union sctp_subtype type, | |
3366 | void *arg, | |
3367 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3368 | { |
3369 | struct sctp_chunk *chunk = arg; | |
78731085 | 3370 | struct sctp_sackhdr *sackh; |
1da177e4 LT |
3371 | __u32 ctsn; |
3372 | ||
3373 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3374 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3375 | |
3376 | /* Make sure that the SACK chunk has a valid length. */ | |
d4d6c614 | 3377 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_sack_chunk))) |
24cb81a6 | 3378 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3379 | commands); |
3380 | ||
3381 | /* Pull the SACK chunk from the data buffer */ | |
3382 | sackh = sctp_sm_pull_sack(chunk); | |
3383 | /* Was this a bogus SACK? */ | |
3384 | if (!sackh) | |
24cb81a6 | 3385 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3386 | chunk->subh.sack_hdr = sackh; |
3387 | ctsn = ntohl(sackh->cum_tsn_ack); | |
3388 | ||
356b23c0 KK |
3389 | /* If Cumulative TSN Ack beyond the max tsn currently |
3390 | * send, terminating the association and respond to the | |
3391 | * sender with an ABORT. | |
3392 | */ | |
3393 | if (TSN_lte(asoc->next_tsn, ctsn)) | |
3394 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); | |
3395 | ||
3396 | trace_sctp_probe(ep, asoc, chunk); | |
3397 | ||
1da177e4 LT |
3398 | /* i) If Cumulative TSN Ack is less than the Cumulative TSN |
3399 | * Ack Point, then drop the SACK. Since Cumulative TSN | |
3400 | * Ack is monotonically increasing, a SACK whose | |
3401 | * Cumulative TSN Ack is less than the Cumulative TSN Ack | |
3402 | * Point indicates an out-of-order SACK. | |
3403 | */ | |
3404 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
3405 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
3406 | asoc->ctsn_ack_point); | |
3407 | ||
1da177e4 LT |
3408 | return SCTP_DISPOSITION_DISCARD; |
3409 | } | |
3410 | ||
3411 | /* Return this SACK for further processing. */ | |
edfee033 | 3412 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk)); |
1da177e4 LT |
3413 | |
3414 | /* Note: We do the rest of the work on the PROCESS_SACK | |
3415 | * sideeffect. | |
3416 | */ | |
3417 | return SCTP_DISPOSITION_CONSUME; | |
3418 | } | |
3419 | ||
3420 | /* | |
3421 | * Generate an ABORT in response to a packet. | |
3422 | * | |
047a2428 | 3423 | * Section: 8.4 Handle "Out of the blue" Packets, sctpimpguide 2.41 |
1da177e4 | 3424 | * |
047a2428 JF |
3425 | * 8) The receiver should respond to the sender of the OOTB packet with |
3426 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3427 | * MUST fill in the Verification Tag field of the outbound packet | |
3428 | * with the value found in the Verification Tag field of the OOTB | |
3429 | * packet and set the T-bit in the Chunk Flags to indicate that the | |
3430 | * Verification Tag is reflected. After sending this ABORT, the | |
3431 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3432 | * no further action. | |
1da177e4 LT |
3433 | * |
3434 | * Verification Tag: | |
3435 | * | |
3436 | * The return value is the disposition of the chunk. | |
3437 | */ | |
172a1599 XL |
3438 | static enum sctp_disposition sctp_sf_tabort_8_4_8( |
3439 | struct net *net, | |
24cb81a6 | 3440 | const struct sctp_endpoint *ep, |
1da177e4 | 3441 | const struct sctp_association *asoc, |
bfc6f827 | 3442 | const union sctp_subtype type, |
1da177e4 | 3443 | void *arg, |
a85bbeb2 | 3444 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
3445 | { |
3446 | struct sctp_packet *packet = NULL; | |
3447 | struct sctp_chunk *chunk = arg; | |
3448 | struct sctp_chunk *abort; | |
3449 | ||
2ce95503 | 3450 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
eab59075 MRL |
3451 | if (!packet) |
3452 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3453 | |
eab59075 MRL |
3454 | /* Make an ABORT. The T bit will be set if the asoc |
3455 | * is NULL. | |
3456 | */ | |
3457 | abort = sctp_make_abort(asoc, chunk, 0); | |
3458 | if (!abort) { | |
3459 | sctp_ootb_pkt_free(packet); | |
3460 | return SCTP_DISPOSITION_NOMEM; | |
3461 | } | |
047a2428 | 3462 | |
eab59075 MRL |
3463 | /* Reflect vtag if T-Bit is set */ |
3464 | if (sctp_test_T_bit(abort)) | |
3465 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3466 | |
eab59075 MRL |
3467 | /* Set the skb to the belonging sock for accounting. */ |
3468 | abort->skb->sk = ep->base.sk; | |
1da177e4 | 3469 | |
eab59075 | 3470 | sctp_packet_append_chunk(packet, abort); |
1da177e4 | 3471 | |
1c16a186 XL |
3472 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(packet)); |
3473 | ||
3474 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); | |
3475 | ||
3476 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
3477 | return SCTP_DISPOSITION_CONSUME; | |
3478 | } | |
3479 | ||
3480 | /* Handling of SCTP Packets Containing an INIT Chunk Matching an | |
3481 | * Existing Associations when the UDP encap port is incorrect. | |
3482 | * | |
3483 | * From Section 4 at draft-tuexen-tsvwg-sctp-udp-encaps-cons-03. | |
3484 | */ | |
3485 | static enum sctp_disposition sctp_sf_new_encap_port( | |
3486 | struct net *net, | |
3487 | const struct sctp_endpoint *ep, | |
3488 | const struct sctp_association *asoc, | |
3489 | const union sctp_subtype type, | |
3490 | void *arg, | |
3491 | struct sctp_cmd_seq *commands) | |
3492 | { | |
3493 | struct sctp_packet *packet = NULL; | |
3494 | struct sctp_chunk *chunk = arg; | |
3495 | struct sctp_chunk *abort; | |
3496 | ||
3497 | packet = sctp_ootb_pkt_new(net, asoc, chunk); | |
3498 | if (!packet) | |
3499 | return SCTP_DISPOSITION_NOMEM; | |
3500 | ||
3501 | abort = sctp_make_new_encap_port(asoc, chunk); | |
3502 | if (!abort) { | |
3503 | sctp_ootb_pkt_free(packet); | |
3504 | return SCTP_DISPOSITION_NOMEM; | |
3505 | } | |
3506 | ||
3507 | abort->skb->sk = ep->base.sk; | |
3508 | ||
3509 | sctp_packet_append_chunk(packet, abort); | |
3510 | ||
eab59075 MRL |
3511 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3512 | SCTP_PACKET(packet)); | |
1da177e4 | 3513 | |
eab59075 | 3514 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3515 | |
eab59075 MRL |
3516 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3517 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
3518 | } |
3519 | ||
3520 | /* | |
3521 | * Received an ERROR chunk from peer. Generate SCTP_REMOTE_ERROR | |
3522 | * event as ULP notification for each cause included in the chunk. | |
3523 | * | |
3524 | * API 5.3.1.3 - SCTP_REMOTE_ERROR | |
3525 | * | |
3526 | * The return value is the disposition of the chunk. | |
3527 | */ | |
172a1599 XL |
3528 | enum sctp_disposition sctp_sf_operr_notify(struct net *net, |
3529 | const struct sctp_endpoint *ep, | |
3530 | const struct sctp_association *asoc, | |
3531 | const union sctp_subtype type, | |
3532 | void *arg, | |
3533 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3534 | { |
3535 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 3536 | struct sctp_errhdr *err; |
1da177e4 LT |
3537 | |
3538 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3539 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3540 | |
3541 | /* Make sure that the ERROR chunk has a valid length. */ | |
87caeba7 | 3542 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 3543 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3544 | commands); |
8a00be1c SW |
3545 | sctp_walk_errors(err, chunk->chunk_hdr); |
3546 | if ((void *)err != (void *)chunk->chunk_end) | |
24cb81a6 | 3547 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
8a00be1c | 3548 | (void *)err, commands); |
1da177e4 | 3549 | |
3df26787 WY |
3550 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_OPERR, |
3551 | SCTP_CHUNK(chunk)); | |
1da177e4 | 3552 | |
1da177e4 | 3553 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
3554 | } |
3555 | ||
3556 | /* | |
3557 | * Process an inbound SHUTDOWN ACK. | |
3558 | * | |
3559 | * From Section 9.2: | |
3560 | * Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3561 | * stop the T2-shutdown timer, send a SHUTDOWN COMPLETE chunk to its | |
3562 | * peer, and remove all record of the association. | |
3563 | * | |
3564 | * The return value is the disposition. | |
3565 | */ | |
172a1599 XL |
3566 | enum sctp_disposition sctp_sf_do_9_2_final(struct net *net, |
3567 | const struct sctp_endpoint *ep, | |
3568 | const struct sctp_association *asoc, | |
3569 | const union sctp_subtype type, | |
3570 | void *arg, | |
3571 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3572 | { |
3573 | struct sctp_chunk *chunk = arg; | |
3574 | struct sctp_chunk *reply; | |
3575 | struct sctp_ulpevent *ev; | |
3576 | ||
3577 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3578 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3579 | |
3580 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3581 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3582 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3583 | commands); |
1da177e4 LT |
3584 | /* 10.2 H) SHUTDOWN COMPLETE notification |
3585 | * | |
3586 | * When SCTP completes the shutdown procedures (section 9.2) this | |
3587 | * notification is passed to the upper layer. | |
3588 | */ | |
3589 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 3590 | 0, 0, 0, NULL, GFP_ATOMIC); |
1da177e4 LT |
3591 | if (!ev) |
3592 | goto nomem; | |
3593 | ||
df7deeb5 VY |
3594 | /* ...send a SHUTDOWN COMPLETE chunk to its peer, */ |
3595 | reply = sctp_make_shutdown_complete(asoc, chunk); | |
3596 | if (!reply) | |
3597 | goto nomem_chunk; | |
3598 | ||
3599 | /* Do all the commands now (after allocation), so that we | |
0c2c366e | 3600 | * have consistent state if memory allocation fails |
df7deeb5 | 3601 | */ |
1da177e4 LT |
3602 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
3603 | ||
3604 | /* Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3605 | * stop the T2-shutdown timer, | |
3606 | */ | |
3607 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3608 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3609 | ||
3610 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3611 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
3612 | ||
1da177e4 LT |
3613 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
3614 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
b01a2407 EB |
3615 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
3616 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3617 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); |
3618 | ||
3619 | /* ...and remove all record of the association. */ | |
3620 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
3621 | return SCTP_DISPOSITION_DELETE_TCB; | |
3622 | ||
df7deeb5 VY |
3623 | nomem_chunk: |
3624 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
3625 | nomem: |
3626 | return SCTP_DISPOSITION_NOMEM; | |
3627 | } | |
3628 | ||
3629 | /* | |
047a2428 JF |
3630 | * RFC 2960, 8.4 - Handle "Out of the blue" Packets, sctpimpguide 2.41. |
3631 | * | |
1da177e4 LT |
3632 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
3633 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. | |
3634 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3635 | * packet must fill in the Verification Tag field of the outbound | |
3636 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
047a2428 JF |
3637 | * set the T-bit in the Chunk Flags to indicate that the Verification |
3638 | * Tag is reflected. | |
1da177e4 LT |
3639 | * |
3640 | * 8) The receiver should respond to the sender of the OOTB packet with | |
3641 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3642 | * MUST fill in the Verification Tag field of the outbound packet | |
3643 | * with the value found in the Verification Tag field of the OOTB | |
047a2428 JF |
3644 | * packet and set the T-bit in the Chunk Flags to indicate that the |
3645 | * Verification Tag is reflected. After sending this ABORT, the | |
3646 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3647 | * no further action. | |
1da177e4 | 3648 | */ |
172a1599 XL |
3649 | enum sctp_disposition sctp_sf_ootb(struct net *net, |
3650 | const struct sctp_endpoint *ep, | |
3651 | const struct sctp_association *asoc, | |
3652 | const union sctp_subtype type, | |
3653 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3654 | { |
3655 | struct sctp_chunk *chunk = arg; | |
3656 | struct sk_buff *skb = chunk->skb; | |
922dbc5b | 3657 | struct sctp_chunkhdr *ch; |
d8238d9d | 3658 | struct sctp_errhdr *err; |
85c5ed4e | 3659 | int ootb_cookie_ack = 0; |
172a1599 XL |
3660 | int ootb_shut_ack = 0; |
3661 | __u8 *ch_end; | |
1da177e4 | 3662 | |
b01a2407 | 3663 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
1da177e4 | 3664 | |
922dbc5b | 3665 | ch = (struct sctp_chunkhdr *)chunk->chunk_hdr; |
1da177e4 | 3666 | do { |
ece25dfa | 3667 | /* Report violation if the chunk is less then minimal */ |
922dbc5b | 3668 | if (ntohs(ch->length) < sizeof(*ch)) |
24cb81a6 | 3669 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 3670 | commands); |
1da177e4 | 3671 | |
bf911e98 MRL |
3672 | /* Report violation if chunk len overflows */ |
3673 | ch_end = ((__u8 *)ch) + SCTP_PAD4(ntohs(ch->length)); | |
3674 | if (ch_end > skb_tail_pointer(skb)) | |
3675 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3676 | commands); | |
3677 | ||
ece25dfa VY |
3678 | /* Now that we know we at least have a chunk header, |
3679 | * do things that are type appropriate. | |
3680 | */ | |
1da177e4 LT |
3681 | if (SCTP_CID_SHUTDOWN_ACK == ch->type) |
3682 | ootb_shut_ack = 1; | |
3683 | ||
3684 | /* RFC 2960, Section 3.3.7 | |
3685 | * Moreover, under any circumstances, an endpoint that | |
3686 | * receives an ABORT MUST NOT respond to that ABORT by | |
3687 | * sending an ABORT of its own. | |
3688 | */ | |
3689 | if (SCTP_CID_ABORT == ch->type) | |
24cb81a6 | 3690 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3691 | |
85c5ed4e SW |
3692 | /* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR |
3693 | * or a COOKIE ACK the SCTP Packet should be silently | |
3694 | * discarded. | |
3695 | */ | |
3696 | ||
3697 | if (SCTP_CID_COOKIE_ACK == ch->type) | |
3698 | ootb_cookie_ack = 1; | |
3699 | ||
3700 | if (SCTP_CID_ERROR == ch->type) { | |
3701 | sctp_walk_errors(err, ch) { | |
3702 | if (SCTP_ERROR_STALE_COOKIE == err->cause) { | |
3703 | ootb_cookie_ack = 1; | |
3704 | break; | |
3705 | } | |
3706 | } | |
3707 | } | |
3708 | ||
922dbc5b | 3709 | ch = (struct sctp_chunkhdr *)ch_end; |
27a884dc | 3710 | } while (ch_end < skb_tail_pointer(skb)); |
1da177e4 LT |
3711 | |
3712 | if (ootb_shut_ack) | |
24cb81a6 | 3713 | return sctp_sf_shut_8_4_5(net, ep, asoc, type, arg, commands); |
85c5ed4e | 3714 | else if (ootb_cookie_ack) |
24cb81a6 | 3715 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3716 | else |
24cb81a6 | 3717 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3718 | } |
3719 | ||
3720 | /* | |
3721 | * Handle an "Out of the blue" SHUTDOWN ACK. | |
3722 | * | |
047a2428 JF |
3723 | * Section: 8.4 5, sctpimpguide 2.41. |
3724 | * | |
1da177e4 | 3725 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
047a2428 JF |
3726 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. |
3727 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3728 | * packet must fill in the Verification Tag field of the outbound | |
3729 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
3730 | * set the T-bit in the Chunk Flags to indicate that the Verification | |
3731 | * Tag is reflected. | |
1da177e4 LT |
3732 | * |
3733 | * Inputs | |
3734 | * (endpoint, asoc, type, arg, commands) | |
3735 | * | |
3736 | * Outputs | |
172a1599 | 3737 | * (enum sctp_disposition) |
1da177e4 LT |
3738 | * |
3739 | * The return value is the disposition of the chunk. | |
3740 | */ | |
172a1599 XL |
3741 | static enum sctp_disposition sctp_sf_shut_8_4_5( |
3742 | struct net *net, | |
3743 | const struct sctp_endpoint *ep, | |
3744 | const struct sctp_association *asoc, | |
3745 | const union sctp_subtype type, | |
3746 | void *arg, | |
3747 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3748 | { |
3749 | struct sctp_packet *packet = NULL; | |
3750 | struct sctp_chunk *chunk = arg; | |
3751 | struct sctp_chunk *shut; | |
3752 | ||
2ce95503 | 3753 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1ff01561 MRL |
3754 | if (!packet) |
3755 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3756 | |
1ff01561 MRL |
3757 | /* Make an SHUTDOWN_COMPLETE. |
3758 | * The T bit will be set if the asoc is NULL. | |
3759 | */ | |
3760 | shut = sctp_make_shutdown_complete(asoc, chunk); | |
3761 | if (!shut) { | |
3762 | sctp_ootb_pkt_free(packet); | |
3763 | return SCTP_DISPOSITION_NOMEM; | |
3764 | } | |
047a2428 | 3765 | |
1ff01561 MRL |
3766 | /* Reflect vtag if T-Bit is set */ |
3767 | if (sctp_test_T_bit(shut)) | |
3768 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3769 | |
1ff01561 MRL |
3770 | /* Set the skb to the belonging sock for accounting. */ |
3771 | shut->skb->sk = ep->base.sk; | |
1da177e4 | 3772 | |
1ff01561 | 3773 | sctp_packet_append_chunk(packet, shut); |
1da177e4 | 3774 | |
1ff01561 MRL |
3775 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3776 | SCTP_PACKET(packet)); | |
1da177e4 | 3777 | |
1ff01561 | 3778 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3779 | |
1ff01561 MRL |
3780 | /* If the chunk length is invalid, we don't want to process |
3781 | * the reset of the packet. | |
3782 | */ | |
922dbc5b | 3783 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3784 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3785 | |
1ff01561 | 3786 | /* We need to discard the rest of the packet to prevent |
0c2c366e | 3787 | * potential boomming attacks from additional bundled chunks. |
1ff01561 MRL |
3788 | * This is documented in SCTP Threats ID. |
3789 | */ | |
3790 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1da177e4 LT |
3791 | } |
3792 | ||
3793 | /* | |
3794 | * Handle SHUTDOWN ACK in COOKIE_ECHOED or COOKIE_WAIT state. | |
3795 | * | |
3796 | * Verification Tag: 8.5.1 E) Rules for packet carrying a SHUTDOWN ACK | |
3797 | * If the receiver is in COOKIE-ECHOED or COOKIE-WAIT state the | |
3798 | * procedures in section 8.4 SHOULD be followed, in other words it | |
3799 | * should be treated as an Out Of The Blue packet. | |
3800 | * [This means that we do NOT check the Verification Tag on these | |
3801 | * chunks. --piggy ] | |
3802 | * | |
3803 | */ | |
172a1599 XL |
3804 | enum sctp_disposition sctp_sf_do_8_5_1_E_sa(struct net *net, |
3805 | const struct sctp_endpoint *ep, | |
3806 | const struct sctp_association *asoc, | |
3807 | const union sctp_subtype type, | |
3808 | void *arg, | |
3809 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3810 | { |
ece25dfa VY |
3811 | struct sctp_chunk *chunk = arg; |
3812 | ||
3813 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3814 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3815 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
3816 | commands); |
3817 | ||
1da177e4 LT |
3818 | /* Although we do have an association in this case, it corresponds |
3819 | * to a restarted association. So the packet is treated as an OOTB | |
3820 | * packet and the state function that handles OOTB SHUTDOWN_ACK is | |
3821 | * called with a NULL association. | |
3822 | */ | |
24cb81a6 | 3823 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
8190f89d | 3824 | |
24cb81a6 | 3825 | return sctp_sf_shut_8_4_5(net, ep, NULL, type, arg, commands); |
1da177e4 LT |
3826 | } |
3827 | ||
3828 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. */ | |
172a1599 XL |
3829 | enum sctp_disposition sctp_sf_do_asconf(struct net *net, |
3830 | const struct sctp_endpoint *ep, | |
3831 | const struct sctp_association *asoc, | |
3832 | const union sctp_subtype type, | |
3833 | void *arg, | |
3834 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3835 | { |
172a1599 XL |
3836 | struct sctp_paramhdr *err_param = NULL; |
3837 | struct sctp_chunk *asconf_ack = NULL; | |
3838 | struct sctp_chunk *chunk = arg; | |
3839 | struct sctp_addiphdr *hdr; | |
3840 | __u32 serial; | |
1da177e4 LT |
3841 | |
3842 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3843 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3844 | SCTP_NULL()); | |
24cb81a6 | 3845 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3846 | } |
3847 | ||
6afd2e83 VY |
3848 | /* ADD-IP: Section 4.1.1 |
3849 | * This chunk MUST be sent in an authenticated way by using | |
3850 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3851 | * is received unauthenticated it MUST be silently discarded as | |
3852 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3853 | */ | |
a2eeacc8 XL |
3854 | if (!asoc->peer.asconf_capable || |
3855 | (!net->sctp.addip_noauth && !chunk->auth)) | |
68d75469 XL |
3856 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
3857 | commands); | |
6afd2e83 | 3858 | |
1da177e4 | 3859 | /* Make sure that the ASCONF ADDIP chunk has a valid length. */ |
68d75469 | 3860 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_addip_chunk))) |
24cb81a6 | 3861 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3862 | commands); |
3863 | ||
65205cc4 | 3864 | hdr = (struct sctp_addiphdr *)chunk->skb->data; |
1da177e4 LT |
3865 | serial = ntohl(hdr->serial); |
3866 | ||
6f4c618d | 3867 | /* Verify the ASCONF chunk before processing it. */ |
9de7922b | 3868 | if (!sctp_verify_asconf(asoc, chunk, true, &err_param)) |
24cb81a6 | 3869 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3870 | (void *)err_param, commands); |
6f4c618d | 3871 | |
a08de64d | 3872 | /* ADDIP 5.2 E1) Compare the value of the serial number to the value |
1da177e4 | 3873 | * the endpoint stored in a new association variable |
d808ad9a | 3874 | * 'Peer-Serial-Number'. |
1da177e4 LT |
3875 | */ |
3876 | if (serial == asoc->peer.addip_serial + 1) { | |
a08de64d VY |
3877 | /* If this is the first instance of ASCONF in the packet, |
3878 | * we can clean our old ASCONF-ACKs. | |
3879 | */ | |
3880 | if (!chunk->has_asconf) | |
3881 | sctp_assoc_clean_asconf_ack_cache(asoc); | |
3882 | ||
3883 | /* ADDIP 5.2 E4) When the Sequence Number matches the next one | |
3884 | * expected, process the ASCONF as described below and after | |
3885 | * processing the ASCONF Chunk, append an ASCONF-ACK Chunk to | |
3886 | * the response packet and cache a copy of it (in the event it | |
3887 | * later needs to be retransmitted). | |
3888 | * | |
3889 | * Essentially, do V1-V5. | |
1da177e4 LT |
3890 | */ |
3891 | asconf_ack = sctp_process_asconf((struct sctp_association *) | |
3892 | asoc, chunk); | |
3893 | if (!asconf_ack) | |
3894 | return SCTP_DISPOSITION_NOMEM; | |
a08de64d VY |
3895 | } else if (serial < asoc->peer.addip_serial + 1) { |
3896 | /* ADDIP 5.2 E2) | |
3897 | * If the value found in the Sequence Number is less than the | |
3898 | * ('Peer- Sequence-Number' + 1), simply skip to the next | |
3899 | * ASCONF, and include in the outbound response packet | |
3900 | * any previously cached ASCONF-ACK response that was | |
3901 | * sent and saved that matches the Sequence Number of the | |
3902 | * ASCONF. Note: It is possible that no cached ASCONF-ACK | |
3903 | * Chunk exists. This will occur when an older ASCONF | |
3904 | * arrives out of order. In such a case, the receiver | |
3905 | * should skip the ASCONF Chunk and not include ASCONF-ACK | |
3906 | * Chunk for that chunk. | |
1da177e4 | 3907 | */ |
a08de64d VY |
3908 | asconf_ack = sctp_assoc_lookup_asconf_ack(asoc, hdr->serial); |
3909 | if (!asconf_ack) | |
1da177e4 | 3910 | return SCTP_DISPOSITION_DISCARD; |
31b02e15 VY |
3911 | |
3912 | /* Reset the transport so that we select the correct one | |
3913 | * this time around. This is to make sure that we don't | |
3914 | * accidentally use a stale transport that's been removed. | |
3915 | */ | |
3916 | asconf_ack->transport = NULL; | |
1da177e4 | 3917 | } else { |
a08de64d | 3918 | /* ADDIP 5.2 E5) Otherwise, the ASCONF Chunk is discarded since |
1da177e4 | 3919 | * it must be either a stale packet or from an attacker. |
d808ad9a | 3920 | */ |
1da177e4 LT |
3921 | return SCTP_DISPOSITION_DISCARD; |
3922 | } | |
3923 | ||
a08de64d VY |
3924 | /* ADDIP 5.2 E6) The destination address of the SCTP packet |
3925 | * containing the ASCONF-ACK Chunks MUST be the source address of | |
3926 | * the SCTP packet that held the ASCONF Chunks. | |
3927 | * | |
3928 | * To do this properly, we'll set the destination address of the chunk | |
3929 | * and at the transmit time, will try look up the transport to use. | |
3930 | * Since ASCONFs may be bundled, the correct transport may not be | |
94e2bd68 | 3931 | * created until we process the entire packet, thus this workaround. |
1da177e4 | 3932 | */ |
a08de64d | 3933 | asconf_ack->dest = chunk->source; |
1da177e4 | 3934 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asconf_ack)); |
6af29ccc | 3935 | if (asoc->new_transport) { |
f7010e61 | 3936 | sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport, commands); |
6af29ccc MH |
3937 | ((struct sctp_association *)asoc)->new_transport = NULL; |
3938 | } | |
d808ad9a | 3939 | |
1da177e4 LT |
3940 | return SCTP_DISPOSITION_CONSUME; |
3941 | } | |
3942 | ||
fbd01973 XL |
3943 | static enum sctp_disposition sctp_send_next_asconf( |
3944 | struct net *net, | |
3945 | const struct sctp_endpoint *ep, | |
3946 | struct sctp_association *asoc, | |
3947 | const union sctp_subtype type, | |
3948 | struct sctp_cmd_seq *commands) | |
3949 | { | |
3950 | struct sctp_chunk *asconf; | |
3951 | struct list_head *entry; | |
3952 | ||
3953 | if (list_empty(&asoc->addip_chunk_list)) | |
3954 | return SCTP_DISPOSITION_CONSUME; | |
3955 | ||
3956 | entry = asoc->addip_chunk_list.next; | |
3957 | asconf = list_entry(entry, struct sctp_chunk, list); | |
3958 | ||
3959 | list_del_init(entry); | |
3960 | sctp_chunk_hold(asconf); | |
3961 | asoc->addip_last_asconf = asconf; | |
3962 | ||
3963 | return sctp_sf_do_prm_asconf(net, ep, asoc, type, asconf, commands); | |
3964 | } | |
3965 | ||
1da177e4 LT |
3966 | /* |
3967 | * ADDIP Section 4.3 General rules for address manipulation | |
3968 | * When building TLV parameters for the ASCONF Chunk that will add or | |
3969 | * delete IP addresses the D0 to D13 rules should be applied: | |
3970 | */ | |
172a1599 XL |
3971 | enum sctp_disposition sctp_sf_do_asconf_ack(struct net *net, |
3972 | const struct sctp_endpoint *ep, | |
3973 | const struct sctp_association *asoc, | |
3974 | const union sctp_subtype type, | |
3975 | void *arg, | |
3976 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3977 | { |
172a1599 XL |
3978 | struct sctp_chunk *last_asconf = asoc->addip_last_asconf; |
3979 | struct sctp_paramhdr *err_param = NULL; | |
3980 | struct sctp_chunk *asconf_ack = arg; | |
3981 | struct sctp_addiphdr *addip_hdr; | |
3982 | __u32 sent_serial, rcvd_serial; | |
3983 | struct sctp_chunk *abort; | |
1da177e4 LT |
3984 | |
3985 | if (!sctp_vtag_verify(asconf_ack, asoc)) { | |
3986 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3987 | SCTP_NULL()); | |
24cb81a6 | 3988 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3989 | } |
3990 | ||
6afd2e83 VY |
3991 | /* ADD-IP, Section 4.1.2: |
3992 | * This chunk MUST be sent in an authenticated way by using | |
3993 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3994 | * is received unauthenticated it MUST be silently discarded as | |
3995 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3996 | */ | |
a2eeacc8 XL |
3997 | if (!asoc->peer.asconf_capable || |
3998 | (!net->sctp.addip_noauth && !asconf_ack->auth)) | |
68d75469 XL |
3999 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
4000 | commands); | |
6afd2e83 | 4001 | |
1da177e4 | 4002 | /* Make sure that the ADDIP chunk has a valid length. */ |
68d75469 XL |
4003 | if (!sctp_chunk_length_valid(asconf_ack, |
4004 | sizeof(struct sctp_addip_chunk))) | |
24cb81a6 | 4005 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4006 | commands); |
4007 | ||
65205cc4 | 4008 | addip_hdr = (struct sctp_addiphdr *)asconf_ack->skb->data; |
1da177e4 LT |
4009 | rcvd_serial = ntohl(addip_hdr->serial); |
4010 | ||
6f4c618d | 4011 | /* Verify the ASCONF-ACK chunk before processing it. */ |
9de7922b | 4012 | if (!sctp_verify_asconf(asoc, asconf_ack, false, &err_param)) |
24cb81a6 | 4013 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 4014 | (void *)err_param, commands); |
6f4c618d | 4015 | |
1da177e4 | 4016 | if (last_asconf) { |
65205cc4 | 4017 | addip_hdr = (struct sctp_addiphdr *)last_asconf->subh.addip_hdr; |
1da177e4 LT |
4018 | sent_serial = ntohl(addip_hdr->serial); |
4019 | } else { | |
4020 | sent_serial = asoc->addip_serial - 1; | |
4021 | } | |
4022 | ||
4023 | /* D0) If an endpoint receives an ASCONF-ACK that is greater than or | |
4024 | * equal to the next serial number to be used but no ASCONF chunk is | |
4025 | * outstanding the endpoint MUST ABORT the association. Note that a | |
4026 | * sequence number is greater than if it is no more than 2^^31-1 | |
4027 | * larger than the current sequence number (using serial arithmetic). | |
4028 | */ | |
4029 | if (ADDIP_SERIAL_gte(rcvd_serial, sent_serial + 1) && | |
4030 | !(asoc->addip_last_asconf)) { | |
4031 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 4032 | sizeof(struct sctp_errhdr)); |
1da177e4 | 4033 | if (abort) { |
00f1c2df | 4034 | sctp_init_cause(abort, SCTP_ERROR_ASCONF_ACK, 0); |
1da177e4 LT |
4035 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
4036 | SCTP_CHUNK(abort)); | |
4037 | } | |
4038 | /* We are going to ABORT, so we might as well stop | |
4039 | * processing the rest of the chunks in the packet. | |
4040 | */ | |
4041 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
4042 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
cb3f837b | 4043 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 4044 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 4045 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 4046 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 4047 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
4048 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
4049 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
4050 | return SCTP_DISPOSITION_ABORT; |
4051 | } | |
4052 | ||
4053 | if ((rcvd_serial == sent_serial) && asoc->addip_last_asconf) { | |
4054 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
4055 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
4056 | ||
4057 | if (!sctp_process_asconf_ack((struct sctp_association *)asoc, | |
fbd01973 XL |
4058 | asconf_ack)) |
4059 | return sctp_send_next_asconf(net, ep, | |
4060 | (struct sctp_association *)asoc, | |
4061 | type, commands); | |
1da177e4 LT |
4062 | |
4063 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 4064 | sizeof(struct sctp_errhdr)); |
1da177e4 | 4065 | if (abort) { |
00f1c2df | 4066 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); |
1da177e4 LT |
4067 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
4068 | SCTP_CHUNK(abort)); | |
4069 | } | |
4070 | /* We are going to ABORT, so we might as well stop | |
4071 | * processing the rest of the chunks in the packet. | |
4072 | */ | |
cb3f837b | 4073 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 4074 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 4075 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 4076 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 4077 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
4078 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
4079 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
4080 | return SCTP_DISPOSITION_ABORT; |
4081 | } | |
4082 | ||
4083 | return SCTP_DISPOSITION_DISCARD; | |
4084 | } | |
4085 | ||
2040d3d7 | 4086 | /* RE-CONFIG Section 5.2 Upon reception of an RECONF Chunk. */ |
172a1599 XL |
4087 | enum sctp_disposition sctp_sf_do_reconf(struct net *net, |
4088 | const struct sctp_endpoint *ep, | |
4089 | const struct sctp_association *asoc, | |
4090 | const union sctp_subtype type, | |
4091 | void *arg, | |
4092 | struct sctp_cmd_seq *commands) | |
2040d3d7 XL |
4093 | { |
4094 | struct sctp_paramhdr *err_param = NULL; | |
4095 | struct sctp_chunk *chunk = arg; | |
4096 | struct sctp_reconf_chunk *hdr; | |
4097 | union sctp_params param; | |
4098 | ||
4099 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4100 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4101 | SCTP_NULL()); | |
4102 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
4103 | } | |
4104 | ||
4105 | /* Make sure that the RECONF chunk has a valid length. */ | |
4106 | if (!sctp_chunk_length_valid(chunk, sizeof(*hdr))) | |
4107 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
4108 | commands); | |
4109 | ||
4110 | if (!sctp_verify_reconf(asoc, chunk, &err_param)) | |
4111 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
4112 | (void *)err_param, commands); | |
4113 | ||
4114 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
4115 | sctp_walk_params(param, hdr, params) { | |
4116 | struct sctp_chunk *reply = NULL; | |
4117 | struct sctp_ulpevent *ev = NULL; | |
4118 | ||
4119 | if (param.p->type == SCTP_PARAM_RESET_OUT_REQUEST) | |
4120 | reply = sctp_process_strreset_outreq( | |
4121 | (struct sctp_association *)asoc, param, &ev); | |
4122 | else if (param.p->type == SCTP_PARAM_RESET_IN_REQUEST) | |
4123 | reply = sctp_process_strreset_inreq( | |
4124 | (struct sctp_association *)asoc, param, &ev); | |
692787ce XL |
4125 | else if (param.p->type == SCTP_PARAM_RESET_TSN_REQUEST) |
4126 | reply = sctp_process_strreset_tsnreq( | |
4127 | (struct sctp_association *)asoc, param, &ev); | |
50a41591 XL |
4128 | else if (param.p->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) |
4129 | reply = sctp_process_strreset_addstrm_out( | |
4130 | (struct sctp_association *)asoc, param, &ev); | |
c5c4ebb3 XL |
4131 | else if (param.p->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) |
4132 | reply = sctp_process_strreset_addstrm_in( | |
4133 | (struct sctp_association *)asoc, param, &ev); | |
11ae76e6 XL |
4134 | else if (param.p->type == SCTP_PARAM_RESET_RESPONSE) |
4135 | reply = sctp_process_strreset_resp( | |
4136 | (struct sctp_association *)asoc, param, &ev); | |
2040d3d7 XL |
4137 | |
4138 | if (ev) | |
4139 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
4140 | SCTP_ULPEVENT(ev)); | |
4141 | ||
4142 | if (reply) | |
4143 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4144 | SCTP_CHUNK(reply)); | |
4145 | } | |
4146 | ||
4147 | return SCTP_DISPOSITION_CONSUME; | |
4148 | } | |
4149 | ||
1da177e4 LT |
4150 | /* |
4151 | * PR-SCTP Section 3.6 Receiver Side Implementation of PR-SCTP | |
4152 | * | |
4153 | * When a FORWARD TSN chunk arrives, the data receiver MUST first update | |
4154 | * its cumulative TSN point to the value carried in the FORWARD TSN | |
4155 | * chunk, and then MUST further advance its cumulative TSN point locally | |
4156 | * if possible. | |
4157 | * After the above processing, the data receiver MUST stop reporting any | |
4158 | * missing TSNs earlier than or equal to the new cumulative TSN point. | |
4159 | * | |
4160 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4161 | * | |
4162 | * The return value is the disposition of the chunk. | |
4163 | */ | |
172a1599 XL |
4164 | enum sctp_disposition sctp_sf_eat_fwd_tsn(struct net *net, |
4165 | const struct sctp_endpoint *ep, | |
4166 | const struct sctp_association *asoc, | |
4167 | const union sctp_subtype type, | |
4168 | void *arg, | |
4169 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4170 | { |
1da177e4 | 4171 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4172 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
4173 | __u16 len; |
4174 | __u32 tsn; | |
4175 | ||
4176 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4177 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4178 | SCTP_NULL()); | |
24cb81a6 | 4179 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4180 | } |
4181 | ||
d15c9ede XL |
4182 | if (!asoc->peer.prsctp_capable) |
4183 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4184 | ||
1da177e4 | 4185 | /* Make sure that the FORWARD_TSN chunk has valid length. */ |
0fc2ea92 | 4186 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 4187 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4188 | commands); |
4189 | ||
4190 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4191 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4192 | len = ntohs(chunk->chunk_hdr->length); | |
4193 | len -= sizeof(struct sctp_chunkhdr); | |
4194 | skb_pull(chunk->skb, len); | |
4195 | ||
4196 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4197 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4198 | |
4199 | /* The TSN is too high--silently discard the chunk and count on it | |
4200 | * getting retransmitted later. | |
4201 | */ | |
4202 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4203 | goto discard_noforce; | |
4204 | ||
0fc2ea92 XL |
4205 | if (!asoc->stream.si->validate_ftsn(chunk)) |
4206 | goto discard_noforce; | |
9fcb95a1 | 4207 | |
1da177e4 | 4208 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 4209 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 4210 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4211 | SCTP_CHUNK(chunk)); |
d808ad9a | 4212 | |
1da177e4 | 4213 | /* Count this as receiving DATA. */ |
9f70f46b | 4214 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
4215 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
4216 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
4217 | } | |
d808ad9a | 4218 | |
1da177e4 | 4219 | /* FIXME: For now send a SACK, but DATA processing may |
d808ad9a | 4220 | * send another. |
1da177e4 LT |
4221 | */ |
4222 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE()); | |
1da177e4 LT |
4223 | |
4224 | return SCTP_DISPOSITION_CONSUME; | |
4225 | ||
4226 | discard_noforce: | |
4227 | return SCTP_DISPOSITION_DISCARD; | |
4228 | } | |
4229 | ||
172a1599 XL |
4230 | enum sctp_disposition sctp_sf_eat_fwd_tsn_fast( |
4231 | struct net *net, | |
4232 | const struct sctp_endpoint *ep, | |
4233 | const struct sctp_association *asoc, | |
4234 | const union sctp_subtype type, | |
4235 | void *arg, | |
4236 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4237 | { |
1da177e4 | 4238 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4239 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
4240 | __u16 len; |
4241 | __u32 tsn; | |
4242 | ||
4243 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4244 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4245 | SCTP_NULL()); | |
24cb81a6 | 4246 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4247 | } |
4248 | ||
d15c9ede XL |
4249 | if (!asoc->peer.prsctp_capable) |
4250 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4251 | ||
1da177e4 | 4252 | /* Make sure that the FORWARD_TSN chunk has a valid length. */ |
0fc2ea92 | 4253 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 4254 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4255 | commands); |
4256 | ||
4257 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4258 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4259 | len = ntohs(chunk->chunk_hdr->length); | |
4260 | len -= sizeof(struct sctp_chunkhdr); | |
4261 | skb_pull(chunk->skb, len); | |
4262 | ||
4263 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4264 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4265 | |
4266 | /* The TSN is too high--silently discard the chunk and count on it | |
4267 | * getting retransmitted later. | |
4268 | */ | |
4269 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4270 | goto gen_shutdown; | |
4271 | ||
0fc2ea92 XL |
4272 | if (!asoc->stream.si->validate_ftsn(chunk)) |
4273 | goto gen_shutdown; | |
9fcb95a1 | 4274 | |
1da177e4 | 4275 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 4276 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 4277 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4278 | SCTP_CHUNK(chunk)); |
d808ad9a | 4279 | |
1da177e4 LT |
4280 | /* Go a head and force a SACK, since we are shutting down. */ |
4281 | gen_shutdown: | |
4282 | /* Implementor's Guide. | |
4283 | * | |
4284 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
4285 | * respond to each received packet containing one or more DATA chunk(s) | |
4286 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
4287 | */ | |
4288 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
4289 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
4290 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
4291 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
4292 | ||
d808ad9a | 4293 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4294 | } |
4295 | ||
bbd0d598 | 4296 | /* |
0c2c366e | 4297 | * SCTP-AUTH Section 6.3 Receiving authenticated chunks |
bbd0d598 VY |
4298 | * |
4299 | * The receiver MUST use the HMAC algorithm indicated in the HMAC | |
4300 | * Identifier field. If this algorithm was not specified by the | |
4301 | * receiver in the HMAC-ALGO parameter in the INIT or INIT-ACK chunk | |
4302 | * during association setup, the AUTH chunk and all chunks after it MUST | |
4303 | * be discarded and an ERROR chunk SHOULD be sent with the error cause | |
4304 | * defined in Section 4.1. | |
4305 | * | |
4306 | * If an endpoint with no shared key receives a Shared Key Identifier | |
4307 | * other than 0, it MUST silently discard all authenticated chunks. If | |
4308 | * the endpoint has at least one endpoint pair shared key for the peer, | |
4309 | * it MUST use the key specified by the Shared Key Identifier if a | |
4310 | * key has been configured for that Shared Key Identifier. If no | |
4311 | * endpoint pair shared key has been configured for that Shared Key | |
4312 | * Identifier, all authenticated chunks MUST be silently discarded. | |
4313 | * | |
4314 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4315 | * | |
4316 | * The return value is the disposition of the chunk. | |
4317 | */ | |
4785c7ae | 4318 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 | 4319 | const struct sctp_association *asoc, |
172a1599 | 4320 | struct sctp_chunk *chunk) |
bbd0d598 | 4321 | { |
1b1e0bc9 | 4322 | struct sctp_shared_key *sh_key = NULL; |
bbd0d598 | 4323 | struct sctp_authhdr *auth_hdr; |
172a1599 | 4324 | __u8 *save_digest, *digest; |
bbd0d598 VY |
4325 | struct sctp_hmac *hmac; |
4326 | unsigned int sig_len; | |
4327 | __u16 key_id; | |
bbd0d598 VY |
4328 | |
4329 | /* Pull in the auth header, so we can do some more verification */ | |
4330 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
4331 | chunk->subh.auth_hdr = auth_hdr; | |
bb96dec7 | 4332 | skb_pull(chunk->skb, sizeof(*auth_hdr)); |
bbd0d598 | 4333 | |
02582e9b | 4334 | /* Make sure that we support the HMAC algorithm from the auth |
bbd0d598 VY |
4335 | * chunk. |
4336 | */ | |
4337 | if (!sctp_auth_asoc_verify_hmac_id(asoc, auth_hdr->hmac_id)) | |
4338 | return SCTP_IERROR_AUTH_BAD_HMAC; | |
4339 | ||
4340 | /* Make sure that the provided shared key identifier has been | |
4341 | * configured | |
4342 | */ | |
4343 | key_id = ntohs(auth_hdr->shkey_id); | |
1b1e0bc9 XL |
4344 | if (key_id != asoc->active_key_id) { |
4345 | sh_key = sctp_auth_get_shkey(asoc, key_id); | |
4346 | if (!sh_key) | |
4347 | return SCTP_IERROR_AUTH_BAD_KEYID; | |
4348 | } | |
bbd0d598 VY |
4349 | |
4350 | /* Make sure that the length of the signature matches what | |
4351 | * we expect. | |
4352 | */ | |
bb96dec7 XL |
4353 | sig_len = ntohs(chunk->chunk_hdr->length) - |
4354 | sizeof(struct sctp_auth_chunk); | |
bbd0d598 VY |
4355 | hmac = sctp_auth_get_hmac(ntohs(auth_hdr->hmac_id)); |
4356 | if (sig_len != hmac->hmac_len) | |
4357 | return SCTP_IERROR_PROTO_VIOLATION; | |
4358 | ||
4359 | /* Now that we've done validation checks, we can compute and | |
4360 | * verify the hmac. The steps involved are: | |
4361 | * 1. Save the digest from the chunk. | |
4362 | * 2. Zero out the digest in the chunk. | |
4363 | * 3. Compute the new digest | |
4364 | * 4. Compare saved and new digests. | |
4365 | */ | |
4366 | digest = auth_hdr->hmac; | |
4367 | skb_pull(chunk->skb, sig_len); | |
4368 | ||
4369 | save_digest = kmemdup(digest, sig_len, GFP_ATOMIC); | |
4370 | if (!save_digest) | |
4371 | goto nomem; | |
4372 | ||
4373 | memset(digest, 0, sig_len); | |
4374 | ||
4375 | sctp_auth_calculate_hmac(asoc, chunk->skb, | |
bb96dec7 | 4376 | (struct sctp_auth_chunk *)chunk->chunk_hdr, |
1b1e0bc9 | 4377 | sh_key, GFP_ATOMIC); |
bbd0d598 VY |
4378 | |
4379 | /* Discard the packet if the digests do not match */ | |
4380 | if (memcmp(save_digest, digest, sig_len)) { | |
4381 | kfree(save_digest); | |
4382 | return SCTP_IERROR_BAD_SIG; | |
4383 | } | |
4384 | ||
4385 | kfree(save_digest); | |
4386 | chunk->auth = 1; | |
4387 | ||
4388 | return SCTP_IERROR_NO_ERROR; | |
4389 | nomem: | |
4390 | return SCTP_IERROR_NOMEM; | |
4391 | } | |
4392 | ||
172a1599 XL |
4393 | enum sctp_disposition sctp_sf_eat_auth(struct net *net, |
4394 | const struct sctp_endpoint *ep, | |
4395 | const struct sctp_association *asoc, | |
4396 | const union sctp_subtype type, | |
4397 | void *arg, struct sctp_cmd_seq *commands) | |
bbd0d598 | 4398 | { |
bbd0d598 | 4399 | struct sctp_chunk *chunk = arg; |
4785c7ae | 4400 | struct sctp_authhdr *auth_hdr; |
bbd0d598 | 4401 | struct sctp_chunk *err_chunk; |
4785c7ae | 4402 | enum sctp_ierror error; |
bbd0d598 | 4403 | |
d2f19fa1 WY |
4404 | /* Make sure that the peer has AUTH capable */ |
4405 | if (!asoc->peer.auth_capable) | |
24cb81a6 | 4406 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); |
d2f19fa1 | 4407 | |
bbd0d598 VY |
4408 | if (!sctp_vtag_verify(chunk, asoc)) { |
4409 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4410 | SCTP_NULL()); | |
24cb81a6 | 4411 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 VY |
4412 | } |
4413 | ||
4414 | /* Make sure that the AUTH chunk has valid length. */ | |
4415 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_auth_chunk))) | |
24cb81a6 | 4416 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
bbd0d598 VY |
4417 | commands); |
4418 | ||
4419 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
59d8d443 | 4420 | error = sctp_sf_authenticate(asoc, chunk); |
bbd0d598 | 4421 | switch (error) { |
7fd71b1e JP |
4422 | case SCTP_IERROR_AUTH_BAD_HMAC: |
4423 | /* Generate the ERROR chunk and discard the rest | |
4424 | * of the packet | |
4425 | */ | |
4426 | err_chunk = sctp_make_op_error(asoc, chunk, | |
4427 | SCTP_ERROR_UNSUP_HMAC, | |
4428 | &auth_hdr->hmac_id, | |
4429 | sizeof(__u16), 0); | |
4430 | if (err_chunk) { | |
4431 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4432 | SCTP_CHUNK(err_chunk)); | |
4433 | } | |
df561f66 | 4434 | fallthrough; |
7fd71b1e JP |
4435 | case SCTP_IERROR_AUTH_BAD_KEYID: |
4436 | case SCTP_IERROR_BAD_SIG: | |
24cb81a6 | 4437 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
7fd71b1e JP |
4438 | |
4439 | case SCTP_IERROR_PROTO_VIOLATION: | |
24cb81a6 | 4440 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
7fd71b1e JP |
4441 | commands); |
4442 | ||
4443 | case SCTP_IERROR_NOMEM: | |
4444 | return SCTP_DISPOSITION_NOMEM; | |
4445 | ||
4446 | default: /* Prevent gcc warnings */ | |
4447 | break; | |
bbd0d598 VY |
4448 | } |
4449 | ||
65b07e5d VY |
4450 | if (asoc->active_key_id != ntohs(auth_hdr->shkey_id)) { |
4451 | struct sctp_ulpevent *ev; | |
4452 | ||
4453 | ev = sctp_ulpevent_make_authkey(asoc, ntohs(auth_hdr->shkey_id), | |
ec2e506c | 4454 | SCTP_AUTH_NEW_KEY, GFP_ATOMIC); |
65b07e5d VY |
4455 | |
4456 | if (!ev) | |
4457 | return -ENOMEM; | |
4458 | ||
4459 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
4460 | SCTP_ULPEVENT(ev)); | |
4461 | } | |
4462 | ||
bbd0d598 VY |
4463 | return SCTP_DISPOSITION_CONSUME; |
4464 | } | |
4465 | ||
1da177e4 LT |
4466 | /* |
4467 | * Process an unknown chunk. | |
4468 | * | |
4469 | * Section: 3.2. Also, 2.1 in the implementor's guide. | |
4470 | * | |
4471 | * Chunk Types are encoded such that the highest-order two bits specify | |
4472 | * the action that must be taken if the processing endpoint does not | |
4473 | * recognize the Chunk Type. | |
4474 | * | |
4475 | * 00 - Stop processing this SCTP packet and discard it, do not process | |
4476 | * any further chunks within it. | |
4477 | * | |
4478 | * 01 - Stop processing this SCTP packet and discard it, do not process | |
4479 | * any further chunks within it, and report the unrecognized | |
4480 | * chunk in an 'Unrecognized Chunk Type'. | |
4481 | * | |
4482 | * 10 - Skip this chunk and continue processing. | |
4483 | * | |
4484 | * 11 - Skip this chunk and continue processing, but report in an ERROR | |
4485 | * Chunk using the 'Unrecognized Chunk Type' cause of error. | |
4486 | * | |
4487 | * The return value is the disposition of the chunk. | |
4488 | */ | |
172a1599 XL |
4489 | enum sctp_disposition sctp_sf_unk_chunk(struct net *net, |
4490 | const struct sctp_endpoint *ep, | |
4491 | const struct sctp_association *asoc, | |
4492 | const union sctp_subtype type, | |
4493 | void *arg, | |
4494 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4495 | { |
4496 | struct sctp_chunk *unk_chunk = arg; | |
4497 | struct sctp_chunk *err_chunk; | |
922dbc5b | 4498 | struct sctp_chunkhdr *hdr; |
1da177e4 | 4499 | |
bb33381d | 4500 | pr_debug("%s: processing unknown chunk id:%d\n", __func__, type.chunk); |
1da177e4 LT |
4501 | |
4502 | if (!sctp_vtag_verify(unk_chunk, asoc)) | |
24cb81a6 | 4503 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4504 | |
4505 | /* Make sure that the chunk has a valid length. | |
4506 | * Since we don't know the chunk type, we use a general | |
4507 | * chunkhdr structure to make a comparison. | |
4508 | */ | |
922dbc5b | 4509 | if (!sctp_chunk_length_valid(unk_chunk, sizeof(*hdr))) |
24cb81a6 | 4510 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4511 | commands); |
4512 | ||
4513 | switch (type.chunk & SCTP_CID_ACTION_MASK) { | |
4514 | case SCTP_CID_ACTION_DISCARD: | |
4515 | /* Discard the packet. */ | |
24cb81a6 | 4516 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4517 | case SCTP_CID_ACTION_DISCARD_ERR: |
1da177e4 LT |
4518 | /* Generate an ERROR chunk as response. */ |
4519 | hdr = unk_chunk->chunk_hdr; | |
4520 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4521 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4522 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4523 | 0); |
1da177e4 LT |
4524 | if (err_chunk) { |
4525 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4526 | SCTP_CHUNK(err_chunk)); | |
4527 | } | |
2e3216cd VY |
4528 | |
4529 | /* Discard the packet. */ | |
24cb81a6 | 4530 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4531 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4532 | case SCTP_CID_ACTION_SKIP: |
4533 | /* Skip the chunk. */ | |
4534 | return SCTP_DISPOSITION_DISCARD; | |
1da177e4 LT |
4535 | case SCTP_CID_ACTION_SKIP_ERR: |
4536 | /* Generate an ERROR chunk as response. */ | |
4537 | hdr = unk_chunk->chunk_hdr; | |
4538 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4539 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4540 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4541 | 0); |
1da177e4 LT |
4542 | if (err_chunk) { |
4543 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4544 | SCTP_CHUNK(err_chunk)); | |
4545 | } | |
4546 | /* Skip the chunk. */ | |
4547 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
4548 | default: |
4549 | break; | |
4550 | } | |
4551 | ||
4552 | return SCTP_DISPOSITION_DISCARD; | |
4553 | } | |
4554 | ||
4555 | /* | |
4556 | * Discard the chunk. | |
4557 | * | |
4558 | * Section: 0.2, 5.2.3, 5.2.5, 5.2.6, 6.0, 8.4.6, 8.5.1c, 9.2 | |
4559 | * [Too numerous to mention...] | |
4560 | * Verification Tag: No verification needed. | |
4561 | * Inputs | |
4562 | * (endpoint, asoc, chunk) | |
4563 | * | |
4564 | * Outputs | |
4565 | * (asoc, reply_msg, msg_up, timers, counters) | |
4566 | * | |
4567 | * The return value is the disposition of the chunk. | |
4568 | */ | |
172a1599 XL |
4569 | enum sctp_disposition sctp_sf_discard_chunk(struct net *net, |
4570 | const struct sctp_endpoint *ep, | |
4571 | const struct sctp_association *asoc, | |
4572 | const union sctp_subtype type, | |
4573 | void *arg, | |
4574 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4575 | { |
ece25dfa VY |
4576 | struct sctp_chunk *chunk = arg; |
4577 | ||
4578 | /* Make sure that the chunk has a valid length. | |
4579 | * Since we don't know the chunk type, we use a general | |
4580 | * chunkhdr structure to make a comparison. | |
4581 | */ | |
922dbc5b | 4582 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4583 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4584 | commands); |
4585 | ||
bb33381d DB |
4586 | pr_debug("%s: chunk:%d is discarded\n", __func__, type.chunk); |
4587 | ||
1da177e4 LT |
4588 | return SCTP_DISPOSITION_DISCARD; |
4589 | } | |
4590 | ||
4591 | /* | |
4592 | * Discard the whole packet. | |
4593 | * | |
4594 | * Section: 8.4 2) | |
4595 | * | |
4596 | * 2) If the OOTB packet contains an ABORT chunk, the receiver MUST | |
4597 | * silently discard the OOTB packet and take no further action. | |
1da177e4 LT |
4598 | * |
4599 | * Verification Tag: No verification necessary | |
4600 | * | |
4601 | * Inputs | |
4602 | * (endpoint, asoc, chunk) | |
4603 | * | |
4604 | * Outputs | |
4605 | * (asoc, reply_msg, msg_up, timers, counters) | |
4606 | * | |
4607 | * The return value is the disposition of the chunk. | |
4608 | */ | |
172a1599 XL |
4609 | enum sctp_disposition sctp_sf_pdiscard(struct net *net, |
4610 | const struct sctp_endpoint *ep, | |
4611 | const struct sctp_association *asoc, | |
4612 | const union sctp_subtype type, | |
4613 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 4614 | { |
24cb81a6 | 4615 | SCTP_INC_STATS(net, SCTP_MIB_IN_PKT_DISCARDS); |
1da177e4 LT |
4616 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
4617 | ||
4618 | return SCTP_DISPOSITION_CONSUME; | |
4619 | } | |
4620 | ||
4621 | ||
4622 | /* | |
4623 | * The other end is violating protocol. | |
4624 | * | |
4625 | * Section: Not specified | |
4626 | * Verification Tag: Not specified | |
4627 | * Inputs | |
4628 | * (endpoint, asoc, chunk) | |
4629 | * | |
4630 | * Outputs | |
4631 | * (asoc, reply_msg, msg_up, timers, counters) | |
4632 | * | |
4633 | * We simply tag the chunk as a violation. The state machine will log | |
4634 | * the violation and continue. | |
4635 | */ | |
172a1599 XL |
4636 | enum sctp_disposition sctp_sf_violation(struct net *net, |
4637 | const struct sctp_endpoint *ep, | |
4638 | const struct sctp_association *asoc, | |
4639 | const union sctp_subtype type, | |
4640 | void *arg, | |
4641 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4642 | { |
ece25dfa VY |
4643 | struct sctp_chunk *chunk = arg; |
4644 | ||
4645 | /* Make sure that the chunk has a valid length. */ | |
922dbc5b | 4646 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4647 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4648 | commands); |
4649 | ||
1da177e4 LT |
4650 | return SCTP_DISPOSITION_VIOLATION; |
4651 | } | |
4652 | ||
1da177e4 | 4653 | /* |
aecedeab | 4654 | * Common function to handle a protocol violation. |
1da177e4 | 4655 | */ |
172a1599 XL |
4656 | static enum sctp_disposition sctp_sf_abort_violation( |
4657 | struct net *net, | |
4658 | const struct sctp_endpoint *ep, | |
4659 | const struct sctp_association *asoc, | |
4660 | void *arg, | |
4661 | struct sctp_cmd_seq *commands, | |
4662 | const __u8 *payload, | |
4663 | const size_t paylen) | |
1da177e4 | 4664 | { |
ece25dfa | 4665 | struct sctp_packet *packet = NULL; |
1da177e4 LT |
4666 | struct sctp_chunk *chunk = arg; |
4667 | struct sctp_chunk *abort = NULL; | |
1da177e4 | 4668 | |
bbd0d598 VY |
4669 | /* SCTP-AUTH, Section 6.3: |
4670 | * It should be noted that if the receiver wants to tear | |
4671 | * down an association in an authenticated way only, the | |
4672 | * handling of malformed packets should not result in | |
4673 | * tearing down the association. | |
4674 | * | |
4675 | * This means that if we only want to abort associations | |
4676 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 4677 | * can't destroy this association just because the packet |
bbd0d598 VY |
4678 | * was malformed. |
4679 | */ | |
4680 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
4681 | goto discard; | |
4682 | ||
9abed245 JJ |
4683 | /* Make the abort chunk. */ |
4684 | abort = sctp_make_abort_violation(asoc, chunk, payload, paylen); | |
4685 | if (!abort) | |
4686 | goto nomem; | |
4687 | ||
ece25dfa | 4688 | if (asoc) { |
f4ad85ca GJ |
4689 | /* Treat INIT-ACK as a special case during COOKIE-WAIT. */ |
4690 | if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK && | |
4691 | !asoc->peer.i.init_tag) { | |
cb1844c4 | 4692 | struct sctp_initack_chunk *initack; |
f4ad85ca | 4693 | |
cb1844c4 XL |
4694 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
4695 | if (!sctp_chunk_length_valid(chunk, sizeof(*initack))) | |
f4ad85ca GJ |
4696 | abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T; |
4697 | else { | |
4698 | unsigned int inittag; | |
4699 | ||
4700 | inittag = ntohl(initack->init_hdr.init_tag); | |
4701 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG, | |
4702 | SCTP_U32(inittag)); | |
4703 | } | |
4704 | } | |
4705 | ||
ece25dfa | 4706 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
b01a2407 | 4707 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 4708 | |
ece25dfa VY |
4709 | if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) { |
4710 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
4711 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4712 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4713 | SCTP_ERROR(ECONNREFUSED)); | |
4714 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
4715 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
4716 | } else { | |
4717 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4718 | SCTP_ERROR(ECONNABORTED)); | |
4719 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4720 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 | 4721 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
ece25dfa | 4722 | } |
1da177e4 | 4723 | } else { |
2ce95503 | 4724 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
ece25dfa VY |
4725 | |
4726 | if (!packet) | |
4727 | goto nomem_pkt; | |
4728 | ||
4729 | if (sctp_test_T_bit(abort)) | |
4730 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
4731 | ||
4732 | abort->skb->sk = ep->base.sk; | |
4733 | ||
4734 | sctp_packet_append_chunk(packet, abort); | |
4735 | ||
4736 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
4737 | SCTP_PACKET(packet)); | |
4738 | ||
b01a2407 | 4739 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
4740 | } |
4741 | ||
b01a2407 | 4742 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
d808ad9a | 4743 | |
56eb82bb | 4744 | discard: |
24cb81a6 | 4745 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
1da177e4 LT |
4746 | return SCTP_DISPOSITION_ABORT; |
4747 | ||
ece25dfa VY |
4748 | nomem_pkt: |
4749 | sctp_chunk_free(abort); | |
1da177e4 LT |
4750 | nomem: |
4751 | return SCTP_DISPOSITION_NOMEM; | |
4752 | } | |
4753 | ||
aecedeab WY |
4754 | /* |
4755 | * Handle a protocol violation when the chunk length is invalid. | |
025dfdaf | 4756 | * "Invalid" length is identified as smaller than the minimal length a |
aecedeab | 4757 | * given chunk can be. For example, a SACK chunk has invalid length |
d4d6c614 | 4758 | * if its length is set to be smaller than the size of struct sctp_sack_chunk. |
aecedeab WY |
4759 | * |
4760 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4761 | * error code. | |
4762 | * | |
4763 | * Section: Not specified | |
4764 | * Verification Tag: Nothing to do | |
4765 | * Inputs | |
4766 | * (endpoint, asoc, chunk) | |
4767 | * | |
4768 | * Outputs | |
4769 | * (reply_msg, msg_up, counters) | |
4770 | * | |
4771 | * Generate an ABORT chunk and terminate the association. | |
4772 | */ | |
172a1599 XL |
4773 | static enum sctp_disposition sctp_sf_violation_chunklen( |
4774 | struct net *net, | |
4775 | const struct sctp_endpoint *ep, | |
4776 | const struct sctp_association *asoc, | |
4777 | const union sctp_subtype type, | |
4778 | void *arg, | |
4779 | struct sctp_cmd_seq *commands) | |
aecedeab | 4780 | { |
cb3f837b | 4781 | static const char err_str[] = "The following chunk had invalid length:"; |
aecedeab | 4782 | |
24cb81a6 | 4783 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4784 | sizeof(err_str)); |
aecedeab WY |
4785 | } |
4786 | ||
6f4c618d WY |
4787 | /* |
4788 | * Handle a protocol violation when the parameter length is invalid. | |
33c7cfdb SW |
4789 | * If the length is smaller than the minimum length of a given parameter, |
4790 | * or accumulated length in multi parameters exceeds the end of the chunk, | |
4791 | * the length is considered as invalid. | |
6f4c618d | 4792 | */ |
172a1599 XL |
4793 | static enum sctp_disposition sctp_sf_violation_paramlen( |
4794 | struct net *net, | |
4795 | const struct sctp_endpoint *ep, | |
4796 | const struct sctp_association *asoc, | |
4797 | const union sctp_subtype type, | |
4798 | void *arg, void *ext, | |
4799 | struct sctp_cmd_seq *commands) | |
ba016670 | 4800 | { |
ba016670 WY |
4801 | struct sctp_paramhdr *param = ext; |
4802 | struct sctp_chunk *abort = NULL; | |
172a1599 | 4803 | struct sctp_chunk *chunk = arg; |
6f4c618d | 4804 | |
ba016670 WY |
4805 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) |
4806 | goto discard; | |
4807 | ||
4808 | /* Make the abort chunk. */ | |
4809 | abort = sctp_make_violation_paramlen(asoc, chunk, param); | |
4810 | if (!abort) | |
4811 | goto nomem; | |
4812 | ||
4813 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
b01a2407 | 4814 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
ba016670 WY |
4815 | |
4816 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4817 | SCTP_ERROR(ECONNABORTED)); | |
4818 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4819 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 EB |
4820 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
4821 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
ba016670 WY |
4822 | |
4823 | discard: | |
24cb81a6 | 4824 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
ba016670 WY |
4825 | return SCTP_DISPOSITION_ABORT; |
4826 | nomem: | |
4827 | return SCTP_DISPOSITION_NOMEM; | |
6f4c618d WY |
4828 | } |
4829 | ||
aecedeab WY |
4830 | /* Handle a protocol violation when the peer trying to advance the |
4831 | * cumulative tsn ack to a point beyond the max tsn currently sent. | |
4832 | * | |
4833 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4834 | * error code. | |
4835 | */ | |
172a1599 XL |
4836 | static enum sctp_disposition sctp_sf_violation_ctsn( |
4837 | struct net *net, | |
4838 | const struct sctp_endpoint *ep, | |
4839 | const struct sctp_association *asoc, | |
4840 | const union sctp_subtype type, | |
4841 | void *arg, | |
4842 | struct sctp_cmd_seq *commands) | |
aecedeab | 4843 | { |
cb3f837b | 4844 | static const char err_str[] = "The cumulative tsn ack beyond the max tsn currently sent:"; |
aecedeab | 4845 | |
24cb81a6 | 4846 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4847 | sizeof(err_str)); |
aecedeab WY |
4848 | } |
4849 | ||
ece25dfa | 4850 | /* Handle protocol violation of an invalid chunk bundling. For example, |
25985edc | 4851 | * when we have an association and we receive bundled INIT-ACK, or |
0c2c366e | 4852 | * SHUTDOWN-COMPLETE, our peer is clearly violating the "MUST NOT bundle" |
25985edc | 4853 | * statement from the specs. Additionally, there might be an attacker |
ece25dfa VY |
4854 | * on the path and we may not want to continue this communication. |
4855 | */ | |
172a1599 XL |
4856 | static enum sctp_disposition sctp_sf_violation_chunk( |
4857 | struct net *net, | |
4858 | const struct sctp_endpoint *ep, | |
4859 | const struct sctp_association *asoc, | |
4860 | const union sctp_subtype type, | |
4861 | void *arg, | |
4862 | struct sctp_cmd_seq *commands) | |
ece25dfa | 4863 | { |
cb3f837b | 4864 | static const char err_str[] = "The following chunk violates protocol:"; |
ece25dfa VY |
4865 | |
4866 | if (!asoc) | |
24cb81a6 | 4867 | return sctp_sf_violation(net, ep, asoc, type, arg, commands); |
ece25dfa | 4868 | |
24cb81a6 | 4869 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4870 | sizeof(err_str)); |
ece25dfa | 4871 | } |
1da177e4 LT |
4872 | /*************************************************************************** |
4873 | * These are the state functions for handling primitive (Section 10) events. | |
4874 | ***************************************************************************/ | |
4875 | /* | |
4876 | * sctp_sf_do_prm_asoc | |
4877 | * | |
4878 | * Section: 10.1 ULP-to-SCTP | |
4879 | * B) Associate | |
4880 | * | |
4881 | * Format: ASSOCIATE(local SCTP instance name, destination transport addr, | |
4882 | * outbound stream count) | |
4883 | * -> association id [,destination transport addr list] [,outbound stream | |
4884 | * count] | |
4885 | * | |
4886 | * This primitive allows the upper layer to initiate an association to a | |
4887 | * specific peer endpoint. | |
4888 | * | |
4889 | * The peer endpoint shall be specified by one of the transport addresses | |
4890 | * which defines the endpoint (see Section 1.4). If the local SCTP | |
4891 | * instance has not been initialized, the ASSOCIATE is considered an | |
4892 | * error. | |
4893 | * [This is not relevant for the kernel implementation since we do all | |
4894 | * initialization at boot time. It we hadn't initialized we wouldn't | |
4895 | * get anywhere near this code.] | |
4896 | * | |
4897 | * An association id, which is a local handle to the SCTP association, | |
4898 | * will be returned on successful establishment of the association. If | |
4899 | * SCTP is not able to open an SCTP association with the peer endpoint, | |
4900 | * an error is returned. | |
4901 | * [In the kernel implementation, the struct sctp_association needs to | |
4902 | * be created BEFORE causing this primitive to run.] | |
4903 | * | |
4904 | * Other association parameters may be returned, including the | |
4905 | * complete destination transport addresses of the peer as well as the | |
4906 | * outbound stream count of the local endpoint. One of the transport | |
4907 | * address from the returned destination addresses will be selected by | |
4908 | * the local endpoint as default primary path for sending SCTP packets | |
4909 | * to this peer. The returned "destination transport addr list" can | |
4910 | * be used by the ULP to change the default primary path or to force | |
4911 | * sending a packet to a specific transport address. [All of this | |
4912 | * stuff happens when the INIT ACK arrives. This is a NON-BLOCKING | |
4913 | * function.] | |
4914 | * | |
4915 | * Mandatory attributes: | |
4916 | * | |
4917 | * o local SCTP instance name - obtained from the INITIALIZE operation. | |
4918 | * [This is the argument asoc.] | |
4919 | * o destination transport addr - specified as one of the transport | |
4920 | * addresses of the peer endpoint with which the association is to be | |
4921 | * established. | |
4922 | * [This is asoc->peer.active_path.] | |
4923 | * o outbound stream count - the number of outbound streams the ULP | |
4924 | * would like to open towards this peer endpoint. | |
4925 | * [BUG: This is not currently implemented.] | |
4926 | * Optional attributes: | |
4927 | * | |
4928 | * None. | |
4929 | * | |
4930 | * The return value is a disposition. | |
4931 | */ | |
172a1599 XL |
4932 | enum sctp_disposition sctp_sf_do_prm_asoc(struct net *net, |
4933 | const struct sctp_endpoint *ep, | |
4934 | const struct sctp_association *asoc, | |
4935 | const union sctp_subtype type, | |
4936 | void *arg, | |
4937 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4938 | { |
26ac8e5f | 4939 | struct sctp_association *my_asoc; |
172a1599 | 4940 | struct sctp_chunk *repl; |
1da177e4 LT |
4941 | |
4942 | /* The comment below says that we enter COOKIE-WAIT AFTER | |
4943 | * sending the INIT, but that doesn't actually work in our | |
4944 | * implementation... | |
4945 | */ | |
4946 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4947 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
4948 | ||
4949 | /* RFC 2960 5.1 Normal Establishment of an Association | |
4950 | * | |
4951 | * A) "A" first sends an INIT chunk to "Z". In the INIT, "A" | |
4952 | * must provide its Verification Tag (Tag_A) in the Initiate | |
4953 | * Tag field. Tag_A SHOULD be a random number in the range of | |
4954 | * 1 to 4294967295 (see 5.3.1 for Tag value selection). ... | |
4955 | */ | |
4956 | ||
4957 | repl = sctp_make_init(asoc, &asoc->base.bind_addr, GFP_ATOMIC, 0); | |
4958 | if (!repl) | |
4959 | goto nomem; | |
4960 | ||
405426f6 DB |
4961 | /* Choose transport for INIT. */ |
4962 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
4963 | SCTP_CHUNK(repl)); | |
4964 | ||
1da177e4 LT |
4965 | /* Cast away the const modifier, as we want to just |
4966 | * rerun it through as a sideffect. | |
4967 | */ | |
ab38fb04 VY |
4968 | my_asoc = (struct sctp_association *)asoc; |
4969 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(my_asoc)); | |
1da177e4 LT |
4970 | |
4971 | /* After sending the INIT, "A" starts the T1-init timer and | |
4972 | * enters the COOKIE-WAIT state. | |
4973 | */ | |
4974 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
4975 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4976 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
4977 | return SCTP_DISPOSITION_CONSUME; | |
4978 | ||
4979 | nomem: | |
4980 | return SCTP_DISPOSITION_NOMEM; | |
4981 | } | |
4982 | ||
4983 | /* | |
4984 | * Process the SEND primitive. | |
4985 | * | |
4986 | * Section: 10.1 ULP-to-SCTP | |
4987 | * E) Send | |
4988 | * | |
4989 | * Format: SEND(association id, buffer address, byte count [,context] | |
4990 | * [,stream id] [,life time] [,destination transport address] | |
4991 | * [,unorder flag] [,no-bundle flag] [,payload protocol-id] ) | |
4992 | * -> result | |
4993 | * | |
4994 | * This is the main method to send user data via SCTP. | |
4995 | * | |
4996 | * Mandatory attributes: | |
4997 | * | |
4998 | * o association id - local handle to the SCTP association | |
4999 | * | |
5000 | * o buffer address - the location where the user message to be | |
5001 | * transmitted is stored; | |
5002 | * | |
5003 | * o byte count - The size of the user data in number of bytes; | |
5004 | * | |
5005 | * Optional attributes: | |
5006 | * | |
5007 | * o context - an optional 32 bit integer that will be carried in the | |
5008 | * sending failure notification to the ULP if the transportation of | |
5009 | * this User Message fails. | |
5010 | * | |
5011 | * o stream id - to indicate which stream to send the data on. If not | |
5012 | * specified, stream 0 will be used. | |
5013 | * | |
5014 | * o life time - specifies the life time of the user data. The user data | |
5015 | * will not be sent by SCTP after the life time expires. This | |
5016 | * parameter can be used to avoid efforts to transmit stale | |
5017 | * user messages. SCTP notifies the ULP if the data cannot be | |
5018 | * initiated to transport (i.e. sent to the destination via SCTP's | |
5019 | * send primitive) within the life time variable. However, the | |
5020 | * user data will be transmitted if SCTP has attempted to transmit a | |
5021 | * chunk before the life time expired. | |
5022 | * | |
5023 | * o destination transport address - specified as one of the destination | |
5024 | * transport addresses of the peer endpoint to which this packet | |
5025 | * should be sent. Whenever possible, SCTP should use this destination | |
5026 | * transport address for sending the packets, instead of the current | |
5027 | * primary path. | |
5028 | * | |
5029 | * o unorder flag - this flag, if present, indicates that the user | |
5030 | * would like the data delivered in an unordered fashion to the peer | |
5031 | * (i.e., the U flag is set to 1 on all DATA chunks carrying this | |
5032 | * message). | |
5033 | * | |
5034 | * o no-bundle flag - instructs SCTP not to bundle this user data with | |
5035 | * other outbound DATA chunks. SCTP MAY still bundle even when | |
5036 | * this flag is present, when faced with network congestion. | |
5037 | * | |
5038 | * o payload protocol-id - A 32 bit unsigned integer that is to be | |
5039 | * passed to the peer indicating the type of payload protocol data | |
5040 | * being transmitted. This value is passed as opaque data by SCTP. | |
5041 | * | |
5042 | * The return value is the disposition. | |
5043 | */ | |
172a1599 XL |
5044 | enum sctp_disposition sctp_sf_do_prm_send(struct net *net, |
5045 | const struct sctp_endpoint *ep, | |
5046 | const struct sctp_association *asoc, | |
5047 | const union sctp_subtype type, | |
5048 | void *arg, | |
5049 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5050 | { |
9c5c62be | 5051 | struct sctp_datamsg *msg = arg; |
1da177e4 | 5052 | |
9c5c62be | 5053 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_MSG, SCTP_DATAMSG(msg)); |
1da177e4 LT |
5054 | return SCTP_DISPOSITION_CONSUME; |
5055 | } | |
5056 | ||
5057 | /* | |
5058 | * Process the SHUTDOWN primitive. | |
5059 | * | |
5060 | * Section: 10.1: | |
5061 | * C) Shutdown | |
5062 | * | |
5063 | * Format: SHUTDOWN(association id) | |
5064 | * -> result | |
5065 | * | |
5066 | * Gracefully closes an association. Any locally queued user data | |
5067 | * will be delivered to the peer. The association will be terminated only | |
5068 | * after the peer acknowledges all the SCTP packets sent. A success code | |
5069 | * will be returned on successful termination of the association. If | |
5070 | * attempting to terminate the association results in a failure, an error | |
5071 | * code shall be returned. | |
5072 | * | |
5073 | * Mandatory attributes: | |
5074 | * | |
5075 | * o association id - local handle to the SCTP association | |
5076 | * | |
5077 | * Optional attributes: | |
5078 | * | |
5079 | * None. | |
5080 | * | |
5081 | * The return value is the disposition. | |
5082 | */ | |
172a1599 XL |
5083 | enum sctp_disposition sctp_sf_do_9_2_prm_shutdown( |
5084 | struct net *net, | |
5085 | const struct sctp_endpoint *ep, | |
5086 | const struct sctp_association *asoc, | |
5087 | const union sctp_subtype type, | |
5088 | void *arg, | |
5089 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5090 | { |
172a1599 | 5091 | enum sctp_disposition disposition; |
1da177e4 LT |
5092 | |
5093 | /* From 9.2 Shutdown of an Association | |
5094 | * Upon receipt of the SHUTDOWN primitive from its upper | |
5095 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
5096 | * remains there until all outstanding data has been | |
5097 | * acknowledged by its peer. The endpoint accepts no new data | |
5098 | * from its upper layer, but retransmits data to the far end | |
5099 | * if necessary to fill gaps. | |
5100 | */ | |
5101 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5102 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
5103 | ||
1da177e4 LT |
5104 | disposition = SCTP_DISPOSITION_CONSUME; |
5105 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 5106 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
5107 | arg, commands); |
5108 | } | |
172a1599 | 5109 | |
1da177e4 LT |
5110 | return disposition; |
5111 | } | |
5112 | ||
5113 | /* | |
5114 | * Process the ABORT primitive. | |
5115 | * | |
5116 | * Section: 10.1: | |
5117 | * C) Abort | |
5118 | * | |
5119 | * Format: Abort(association id [, cause code]) | |
5120 | * -> result | |
5121 | * | |
5122 | * Ungracefully closes an association. Any locally queued user data | |
5123 | * will be discarded and an ABORT chunk is sent to the peer. A success code | |
5124 | * will be returned on successful abortion of the association. If | |
5125 | * attempting to abort the association results in a failure, an error | |
5126 | * code shall be returned. | |
5127 | * | |
5128 | * Mandatory attributes: | |
5129 | * | |
5130 | * o association id - local handle to the SCTP association | |
5131 | * | |
5132 | * Optional attributes: | |
5133 | * | |
5134 | * o cause code - reason of the abort to be passed to the peer | |
5135 | * | |
5136 | * None. | |
5137 | * | |
5138 | * The return value is the disposition. | |
5139 | */ | |
172a1599 XL |
5140 | enum sctp_disposition sctp_sf_do_9_1_prm_abort( |
5141 | struct net *net, | |
5142 | const struct sctp_endpoint *ep, | |
5143 | const struct sctp_association *asoc, | |
5144 | const union sctp_subtype type, | |
5145 | void *arg, | |
5146 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5147 | { |
5148 | /* From 9.1 Abort of an Association | |
5149 | * Upon receipt of the ABORT primitive from its upper | |
5150 | * layer, the endpoint enters CLOSED state and | |
5151 | * discard all outstanding data has been | |
5152 | * acknowledged by its peer. The endpoint accepts no new data | |
5153 | * from its upper layer, but retransmits data to the far end | |
5154 | * if necessary to fill gaps. | |
5155 | */ | |
c164a9ba | 5156 | struct sctp_chunk *abort = arg; |
1da177e4 | 5157 | |
068d8bd3 XL |
5158 | if (abort) |
5159 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5160 | |
5161 | /* Even if we can't send the ABORT due to low memory delete the | |
5162 | * TCB. This is a departure from our typical NOMEM handling. | |
5163 | */ | |
5164 | ||
8de8c873 SS |
5165 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5166 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 LT |
5167 | /* Delete the established association. */ |
5168 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 5169 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5170 | |
b01a2407 EB |
5171 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5172 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 | 5173 | |
649621e3 | 5174 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5175 | } |
5176 | ||
5177 | /* We tried an illegal operation on an association which is closed. */ | |
172a1599 XL |
5178 | enum sctp_disposition sctp_sf_error_closed(struct net *net, |
5179 | const struct sctp_endpoint *ep, | |
5180 | const struct sctp_association *asoc, | |
5181 | const union sctp_subtype type, | |
5182 | void *arg, | |
5183 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5184 | { |
5185 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, SCTP_ERROR(-EINVAL)); | |
5186 | return SCTP_DISPOSITION_CONSUME; | |
5187 | } | |
5188 | ||
5189 | /* We tried an illegal operation on an association which is shutting | |
5190 | * down. | |
5191 | */ | |
172a1599 XL |
5192 | enum sctp_disposition sctp_sf_error_shutdown( |
5193 | struct net *net, | |
5194 | const struct sctp_endpoint *ep, | |
5195 | const struct sctp_association *asoc, | |
5196 | const union sctp_subtype type, | |
5197 | void *arg, | |
5198 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5199 | { |
5200 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, | |
5201 | SCTP_ERROR(-ESHUTDOWN)); | |
5202 | return SCTP_DISPOSITION_CONSUME; | |
5203 | } | |
5204 | ||
5205 | /* | |
5206 | * sctp_cookie_wait_prm_shutdown | |
5207 | * | |
5208 | * Section: 4 Note: 2 | |
5209 | * Verification Tag: | |
5210 | * Inputs | |
5211 | * (endpoint, asoc) | |
5212 | * | |
5213 | * The RFC does not explicitly address this issue, but is the route through the | |
5214 | * state table when someone issues a shutdown while in COOKIE_WAIT state. | |
5215 | * | |
5216 | * Outputs | |
5217 | * (timers) | |
5218 | */ | |
172a1599 XL |
5219 | enum sctp_disposition sctp_sf_cookie_wait_prm_shutdown( |
5220 | struct net *net, | |
5221 | const struct sctp_endpoint *ep, | |
5222 | const struct sctp_association *asoc, | |
5223 | const union sctp_subtype type, | |
5224 | void *arg, | |
5225 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5226 | { |
5227 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5228 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5229 | ||
5230 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5231 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5232 | ||
b01a2407 | 5233 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
1da177e4 LT |
5234 | |
5235 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
5236 | ||
5237 | return SCTP_DISPOSITION_DELETE_TCB; | |
5238 | } | |
5239 | ||
5240 | /* | |
5241 | * sctp_cookie_echoed_prm_shutdown | |
5242 | * | |
5243 | * Section: 4 Note: 2 | |
5244 | * Verification Tag: | |
5245 | * Inputs | |
5246 | * (endpoint, asoc) | |
5247 | * | |
0c2c366e | 5248 | * The RFC does not explicitly address this issue, but is the route through the |
1da177e4 LT |
5249 | * state table when someone issues a shutdown while in COOKIE_ECHOED state. |
5250 | * | |
5251 | * Outputs | |
5252 | * (timers) | |
5253 | */ | |
172a1599 XL |
5254 | enum sctp_disposition sctp_sf_cookie_echoed_prm_shutdown( |
5255 | struct net *net, | |
5256 | const struct sctp_endpoint *ep, | |
5257 | const struct sctp_association *asoc, | |
5258 | const union sctp_subtype type, | |
5259 | void *arg, | |
5260 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5261 | { |
5262 | /* There is a single T1 timer, so we should be able to use | |
5263 | * common function with the COOKIE-WAIT state. | |
5264 | */ | |
24cb81a6 | 5265 | return sctp_sf_cookie_wait_prm_shutdown(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5266 | } |
5267 | ||
5268 | /* | |
5269 | * sctp_sf_cookie_wait_prm_abort | |
5270 | * | |
5271 | * Section: 4 Note: 2 | |
5272 | * Verification Tag: | |
5273 | * Inputs | |
5274 | * (endpoint, asoc) | |
5275 | * | |
5276 | * The RFC does not explicitly address this issue, but is the route through the | |
5277 | * state table when someone issues an abort while in COOKIE_WAIT state. | |
5278 | * | |
5279 | * Outputs | |
5280 | * (timers) | |
5281 | */ | |
172a1599 XL |
5282 | enum sctp_disposition sctp_sf_cookie_wait_prm_abort( |
5283 | struct net *net, | |
5284 | const struct sctp_endpoint *ep, | |
5285 | const struct sctp_association *asoc, | |
5286 | const union sctp_subtype type, | |
5287 | void *arg, | |
5288 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5289 | { |
c164a9ba | 5290 | struct sctp_chunk *abort = arg; |
1da177e4 LT |
5291 | |
5292 | /* Stop T1-init timer */ | |
5293 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5294 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1da177e4 | 5295 | |
068d8bd3 XL |
5296 | if (abort) |
5297 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5298 | |
5299 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5300 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5301 | ||
b01a2407 | 5302 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
5303 | |
5304 | /* Even if we can't send the ABORT due to low memory delete the | |
5305 | * TCB. This is a departure from our typical NOMEM handling. | |
5306 | */ | |
5307 | ||
8de8c873 SS |
5308 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5309 | SCTP_ERROR(ECONNREFUSED)); | |
1da177e4 LT |
5310 | /* Delete the established association. */ |
5311 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 5312 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5313 | |
649621e3 | 5314 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5315 | } |
5316 | ||
5317 | /* | |
5318 | * sctp_sf_cookie_echoed_prm_abort | |
5319 | * | |
5320 | * Section: 4 Note: 3 | |
5321 | * Verification Tag: | |
5322 | * Inputs | |
5323 | * (endpoint, asoc) | |
5324 | * | |
5325 | * The RFC does not explcitly address this issue, but is the route through the | |
5326 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5327 | * | |
5328 | * Outputs | |
5329 | * (timers) | |
5330 | */ | |
172a1599 XL |
5331 | enum sctp_disposition sctp_sf_cookie_echoed_prm_abort( |
5332 | struct net *net, | |
5333 | const struct sctp_endpoint *ep, | |
5334 | const struct sctp_association *asoc, | |
5335 | const union sctp_subtype type, | |
5336 | void *arg, | |
5337 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5338 | { |
5339 | /* There is a single T1 timer, so we should be able to use | |
5340 | * common function with the COOKIE-WAIT state. | |
5341 | */ | |
24cb81a6 | 5342 | return sctp_sf_cookie_wait_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5343 | } |
5344 | ||
5345 | /* | |
5346 | * sctp_sf_shutdown_pending_prm_abort | |
5347 | * | |
5348 | * Inputs | |
5349 | * (endpoint, asoc) | |
5350 | * | |
5351 | * The RFC does not explicitly address this issue, but is the route through the | |
5352 | * state table when someone issues an abort while in SHUTDOWN-PENDING state. | |
5353 | * | |
5354 | * Outputs | |
5355 | * (timers) | |
5356 | */ | |
172a1599 XL |
5357 | enum sctp_disposition sctp_sf_shutdown_pending_prm_abort( |
5358 | struct net *net, | |
5359 | const struct sctp_endpoint *ep, | |
5360 | const struct sctp_association *asoc, | |
5361 | const union sctp_subtype type, | |
5362 | void *arg, | |
5363 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5364 | { |
5365 | /* Stop the T5-shutdown guard timer. */ | |
5366 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5367 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5368 | ||
24cb81a6 | 5369 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5370 | } |
5371 | ||
5372 | /* | |
5373 | * sctp_sf_shutdown_sent_prm_abort | |
5374 | * | |
5375 | * Inputs | |
5376 | * (endpoint, asoc) | |
5377 | * | |
5378 | * The RFC does not explicitly address this issue, but is the route through the | |
5379 | * state table when someone issues an abort while in SHUTDOWN-SENT state. | |
5380 | * | |
5381 | * Outputs | |
5382 | * (timers) | |
5383 | */ | |
172a1599 XL |
5384 | enum sctp_disposition sctp_sf_shutdown_sent_prm_abort( |
5385 | struct net *net, | |
5386 | const struct sctp_endpoint *ep, | |
5387 | const struct sctp_association *asoc, | |
5388 | const union sctp_subtype type, | |
5389 | void *arg, | |
5390 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5391 | { |
5392 | /* Stop the T2-shutdown timer. */ | |
5393 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5394 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5395 | ||
5396 | /* Stop the T5-shutdown guard timer. */ | |
5397 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5398 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5399 | ||
24cb81a6 | 5400 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5401 | } |
5402 | ||
5403 | /* | |
5404 | * sctp_sf_cookie_echoed_prm_abort | |
5405 | * | |
5406 | * Inputs | |
5407 | * (endpoint, asoc) | |
5408 | * | |
5409 | * The RFC does not explcitly address this issue, but is the route through the | |
5410 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5411 | * | |
5412 | * Outputs | |
5413 | * (timers) | |
5414 | */ | |
172a1599 XL |
5415 | enum sctp_disposition sctp_sf_shutdown_ack_sent_prm_abort( |
5416 | struct net *net, | |
5417 | const struct sctp_endpoint *ep, | |
5418 | const struct sctp_association *asoc, | |
5419 | const union sctp_subtype type, | |
5420 | void *arg, | |
5421 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5422 | { |
5423 | /* The same T2 timer, so we should be able to use | |
5424 | * common function with the SHUTDOWN-SENT state. | |
5425 | */ | |
24cb81a6 | 5426 | return sctp_sf_shutdown_sent_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5427 | } |
5428 | ||
5429 | /* | |
5430 | * Process the REQUESTHEARTBEAT primitive | |
5431 | * | |
5432 | * 10.1 ULP-to-SCTP | |
5433 | * J) Request Heartbeat | |
5434 | * | |
5435 | * Format: REQUESTHEARTBEAT(association id, destination transport address) | |
5436 | * | |
5437 | * -> result | |
5438 | * | |
5439 | * Instructs the local endpoint to perform a HeartBeat on the specified | |
5440 | * destination transport address of the given association. The returned | |
5441 | * result should indicate whether the transmission of the HEARTBEAT | |
5442 | * chunk to the destination address is successful. | |
5443 | * | |
5444 | * Mandatory attributes: | |
5445 | * | |
5446 | * o association id - local handle to the SCTP association | |
5447 | * | |
5448 | * o destination transport address - the transport address of the | |
5449 | * association on which a heartbeat should be issued. | |
5450 | */ | |
172a1599 | 5451 | enum sctp_disposition sctp_sf_do_prm_requestheartbeat( |
24cb81a6 | 5452 | struct net *net, |
1da177e4 LT |
5453 | const struct sctp_endpoint *ep, |
5454 | const struct sctp_association *asoc, | |
bfc6f827 | 5455 | const union sctp_subtype type, |
1da177e4 | 5456 | void *arg, |
a85bbeb2 | 5457 | struct sctp_cmd_seq *commands) |
1da177e4 | 5458 | { |
fb78525a VY |
5459 | if (SCTP_DISPOSITION_NOMEM == sctp_sf_heartbeat(ep, asoc, type, |
5460 | (struct sctp_transport *)arg, commands)) | |
5461 | return SCTP_DISPOSITION_NOMEM; | |
5462 | ||
5463 | /* | |
5464 | * RFC 2960 (bis), section 8.3 | |
5465 | * | |
5466 | * D) Request an on-demand HEARTBEAT on a specific destination | |
5467 | * transport address of a given association. | |
5468 | * | |
5469 | * The endpoint should increment the respective error counter of | |
5470 | * the destination transport address each time a HEARTBEAT is sent | |
5471 | * to that address and not acknowledged within one RTO. | |
5472 | * | |
5473 | */ | |
7e99013a | 5474 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
fb78525a VY |
5475 | SCTP_TRANSPORT(arg)); |
5476 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5477 | } |
5478 | ||
5479 | /* | |
5480 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
5481 | * When an endpoint has an ASCONF signaled change to be sent to the | |
5482 | * remote endpoint it should do A1 to A9 | |
5483 | */ | |
172a1599 XL |
5484 | enum sctp_disposition sctp_sf_do_prm_asconf(struct net *net, |
5485 | const struct sctp_endpoint *ep, | |
5486 | const struct sctp_association *asoc, | |
5487 | const union sctp_subtype type, | |
5488 | void *arg, | |
5489 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5490 | { |
5491 | struct sctp_chunk *chunk = arg; | |
5492 | ||
5493 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5494 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5495 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5496 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5497 | return SCTP_DISPOSITION_CONSUME; | |
5498 | } | |
5499 | ||
7a090b04 | 5500 | /* RE-CONFIG Section 5.1 RECONF Chunk Procedures */ |
172a1599 XL |
5501 | enum sctp_disposition sctp_sf_do_prm_reconf(struct net *net, |
5502 | const struct sctp_endpoint *ep, | |
5503 | const struct sctp_association *asoc, | |
5504 | const union sctp_subtype type, | |
5505 | void *arg, | |
5506 | struct sctp_cmd_seq *commands) | |
7a090b04 XL |
5507 | { |
5508 | struct sctp_chunk *chunk = arg; | |
5509 | ||
5510 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5511 | return SCTP_DISPOSITION_CONSUME; | |
5512 | } | |
5513 | ||
1da177e4 LT |
5514 | /* |
5515 | * Ignore the primitive event | |
5516 | * | |
5517 | * The return value is the disposition of the primitive. | |
5518 | */ | |
172a1599 XL |
5519 | enum sctp_disposition sctp_sf_ignore_primitive( |
5520 | struct net *net, | |
5521 | const struct sctp_endpoint *ep, | |
5522 | const struct sctp_association *asoc, | |
5523 | const union sctp_subtype type, | |
5524 | void *arg, | |
5525 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5526 | { |
bb33381d DB |
5527 | pr_debug("%s: primitive type:%d is ignored\n", __func__, |
5528 | type.primitive); | |
5529 | ||
1da177e4 LT |
5530 | return SCTP_DISPOSITION_DISCARD; |
5531 | } | |
5532 | ||
5533 | /*************************************************************************** | |
5534 | * These are the state functions for the OTHER events. | |
5535 | ***************************************************************************/ | |
5536 | ||
e1cdd553 WY |
5537 | /* |
5538 | * When the SCTP stack has no more user data to send or retransmit, this | |
5539 | * notification is given to the user. Also, at the time when a user app | |
5540 | * subscribes to this event, if there is no data to be sent or | |
5541 | * retransmit, the stack will immediately send up this notification. | |
5542 | */ | |
172a1599 XL |
5543 | enum sctp_disposition sctp_sf_do_no_pending_tsn( |
5544 | struct net *net, | |
5545 | const struct sctp_endpoint *ep, | |
5546 | const struct sctp_association *asoc, | |
5547 | const union sctp_subtype type, | |
5548 | void *arg, | |
5549 | struct sctp_cmd_seq *commands) | |
e1cdd553 WY |
5550 | { |
5551 | struct sctp_ulpevent *event; | |
5552 | ||
5553 | event = sctp_ulpevent_make_sender_dry_event(asoc, GFP_ATOMIC); | |
5554 | if (!event) | |
5555 | return SCTP_DISPOSITION_NOMEM; | |
5556 | ||
5557 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(event)); | |
5558 | ||
5559 | return SCTP_DISPOSITION_CONSUME; | |
5560 | } | |
5561 | ||
1da177e4 LT |
5562 | /* |
5563 | * Start the shutdown negotiation. | |
5564 | * | |
5565 | * From Section 9.2: | |
5566 | * Once all its outstanding data has been acknowledged, the endpoint | |
5567 | * shall send a SHUTDOWN chunk to its peer including in the Cumulative | |
5568 | * TSN Ack field the last sequential TSN it has received from the peer. | |
5569 | * It shall then start the T2-shutdown timer and enter the SHUTDOWN-SENT | |
5570 | * state. If the timer expires, the endpoint must re-send the SHUTDOWN | |
5571 | * with the updated last sequential TSN received from its peer. | |
5572 | * | |
5573 | * The return value is the disposition. | |
5574 | */ | |
172a1599 XL |
5575 | enum sctp_disposition sctp_sf_do_9_2_start_shutdown( |
5576 | struct net *net, | |
5577 | const struct sctp_endpoint *ep, | |
5578 | const struct sctp_association *asoc, | |
5579 | const union sctp_subtype type, | |
5580 | void *arg, | |
5581 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5582 | { |
5583 | struct sctp_chunk *reply; | |
5584 | ||
5585 | /* Once all its outstanding data has been acknowledged, the | |
5586 | * endpoint shall send a SHUTDOWN chunk to its peer including | |
5587 | * in the Cumulative TSN Ack field the last sequential TSN it | |
5588 | * has received from the peer. | |
5589 | */ | |
22008f56 | 5590 | reply = sctp_make_shutdown(asoc, arg); |
1da177e4 LT |
5591 | if (!reply) |
5592 | goto nomem; | |
5593 | ||
5594 | /* Set the transport for the SHUTDOWN chunk and the timeout for the | |
5595 | * T2-shutdown timer. | |
5596 | */ | |
5597 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5598 | ||
5599 | /* It shall then start the T2-shutdown timer */ | |
5600 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5601 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5602 | ||
536428a9 WY |
5603 | /* RFC 4960 Section 9.2 |
5604 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5605 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5606 | */ | |
f8d96052 | 5607 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
536428a9 WY |
5608 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
5609 | ||
9f70f46b | 5610 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5611 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5612 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5613 | ||
5614 | /* and enter the SHUTDOWN-SENT state. */ | |
5615 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5616 | SCTP_STATE(SCTP_STATE_SHUTDOWN_SENT)); | |
5617 | ||
5618 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5619 | * | |
5620 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5621 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5622 | */ |
5623 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5624 | ||
5625 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5626 | ||
5627 | return SCTP_DISPOSITION_CONSUME; | |
5628 | ||
5629 | nomem: | |
5630 | return SCTP_DISPOSITION_NOMEM; | |
5631 | } | |
5632 | ||
5633 | /* | |
5634 | * Generate a SHUTDOWN ACK now that everything is SACK'd. | |
5635 | * | |
5636 | * From Section 9.2: | |
5637 | * | |
5638 | * If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5639 | * shall send a SHUTDOWN ACK and start a T2-shutdown timer of its own, | |
5640 | * entering the SHUTDOWN-ACK-SENT state. If the timer expires, the | |
5641 | * endpoint must re-send the SHUTDOWN ACK. | |
5642 | * | |
5643 | * The return value is the disposition. | |
5644 | */ | |
172a1599 XL |
5645 | enum sctp_disposition sctp_sf_do_9_2_shutdown_ack( |
5646 | struct net *net, | |
5647 | const struct sctp_endpoint *ep, | |
5648 | const struct sctp_association *asoc, | |
5649 | const union sctp_subtype type, | |
5650 | void *arg, | |
5651 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5652 | { |
172a1599 | 5653 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
5654 | struct sctp_chunk *reply; |
5655 | ||
5656 | /* There are 2 ways of getting here: | |
5657 | * 1) called in response to a SHUTDOWN chunk | |
5658 | * 2) called when SCTP_EVENT_NO_PENDING_TSN event is issued. | |
5659 | * | |
5660 | * For the case (2), the arg parameter is set to NULL. We need | |
5661 | * to check that we have a chunk before accessing it's fields. | |
5662 | */ | |
5663 | if (chunk) { | |
5664 | if (!sctp_vtag_verify(chunk, asoc)) | |
ac23e681 XL |
5665 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
5666 | commands); | |
1da177e4 LT |
5667 | |
5668 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 XL |
5669 | if (!sctp_chunk_length_valid( |
5670 | chunk, sizeof(struct sctp_shutdown_chunk))) | |
5671 | return sctp_sf_violation_chunklen(net, ep, asoc, type, | |
5672 | arg, commands); | |
1da177e4 LT |
5673 | } |
5674 | ||
5675 | /* If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5676 | * shall send a SHUTDOWN ACK ... | |
5677 | */ | |
5678 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
5679 | if (!reply) | |
5680 | goto nomem; | |
5681 | ||
5682 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
5683 | * the T2-shutdown timer. | |
5684 | */ | |
5685 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5686 | ||
5687 | /* and start/restart a T2-shutdown timer of its own, */ | |
5688 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5689 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5690 | ||
9f70f46b | 5691 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5692 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5693 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5694 | ||
5695 | /* Enter the SHUTDOWN-ACK-SENT state. */ | |
5696 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5697 | SCTP_STATE(SCTP_STATE_SHUTDOWN_ACK_SENT)); | |
5698 | ||
5699 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5700 | * | |
5701 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5702 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5703 | */ |
5704 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5705 | ||
5706 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5707 | ||
5708 | return SCTP_DISPOSITION_CONSUME; | |
5709 | ||
5710 | nomem: | |
5711 | return SCTP_DISPOSITION_NOMEM; | |
5712 | } | |
5713 | ||
5714 | /* | |
5715 | * Ignore the event defined as other | |
5716 | * | |
5717 | * The return value is the disposition of the event. | |
5718 | */ | |
172a1599 XL |
5719 | enum sctp_disposition sctp_sf_ignore_other(struct net *net, |
5720 | const struct sctp_endpoint *ep, | |
5721 | const struct sctp_association *asoc, | |
5722 | const union sctp_subtype type, | |
5723 | void *arg, | |
5724 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5725 | { |
bb33381d DB |
5726 | pr_debug("%s: the event other type:%d is ignored\n", |
5727 | __func__, type.other); | |
5728 | ||
1da177e4 LT |
5729 | return SCTP_DISPOSITION_DISCARD; |
5730 | } | |
5731 | ||
5732 | /************************************************************ | |
5733 | * These are the state functions for handling timeout events. | |
5734 | ************************************************************/ | |
5735 | ||
5736 | /* | |
5737 | * RTX Timeout | |
5738 | * | |
5739 | * Section: 6.3.3 Handle T3-rtx Expiration | |
5740 | * | |
5741 | * Whenever the retransmission timer T3-rtx expires for a destination | |
5742 | * address, do the following: | |
5743 | * [See below] | |
5744 | * | |
5745 | * The return value is the disposition of the chunk. | |
5746 | */ | |
172a1599 XL |
5747 | enum sctp_disposition sctp_sf_do_6_3_3_rtx(struct net *net, |
5748 | const struct sctp_endpoint *ep, | |
5749 | const struct sctp_association *asoc, | |
5750 | const union sctp_subtype type, | |
5751 | void *arg, | |
5752 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5753 | { |
5754 | struct sctp_transport *transport = arg; | |
5755 | ||
b01a2407 | 5756 | SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS); |
ac0b0462 | 5757 | |
1da177e4 | 5758 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8a0d19c5 | 5759 | if (asoc->peer.zero_window_announced && |
5760 | asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { | |
f8d96052 TG |
5761 | /* |
5762 | * We are here likely because the receiver had its rwnd | |
5763 | * closed for a while and we have not been able to | |
5764 | * transmit the locally queued data within the maximum | |
5765 | * retransmission attempts limit. Start the T5 | |
5766 | * shutdown guard timer to give the receiver one last | |
5767 | * chance and some additional time to recover before | |
5768 | * aborting. | |
5769 | */ | |
5770 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START_ONCE, | |
5771 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5772 | } else { | |
5773 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
5774 | SCTP_ERROR(ETIMEDOUT)); | |
5775 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
5776 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5777 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
b01a2407 EB |
5778 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5779 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
f8d96052 TG |
5780 | return SCTP_DISPOSITION_DELETE_TCB; |
5781 | } | |
1da177e4 LT |
5782 | } |
5783 | ||
5784 | /* E1) For the destination address for which the timer | |
5785 | * expires, adjust its ssthresh with rules defined in Section | |
5786 | * 7.2.3 and set the cwnd <- MTU. | |
5787 | */ | |
5788 | ||
5789 | /* E2) For the destination address for which the timer | |
5790 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
5791 | * maximum value discussed in rule C7 above (RTO.max) may be | |
5792 | * used to provide an upper bound to this doubling operation. | |
5793 | */ | |
5794 | ||
5795 | /* E3) Determine how many of the earliest (i.e., lowest TSN) | |
5796 | * outstanding DATA chunks for the address for which the | |
5797 | * T3-rtx has expired will fit into a single packet, subject | |
5798 | * to the MTU constraint for the path corresponding to the | |
5799 | * destination transport address to which the retransmission | |
5800 | * is being sent (this may be different from the address for | |
5801 | * which the timer expires [see Section 6.4]). Call this | |
5802 | * value K. Bundle and retransmit those K DATA chunks in a | |
5803 | * single packet to the destination endpoint. | |
5804 | * | |
5805 | * Note: Any DATA chunks that were sent to the address for | |
5806 | * which the T3-rtx timer expired but did not fit in one MTU | |
5807 | * (rule E3 above), should be marked for retransmission and | |
5808 | * sent as soon as cwnd allows (normally when a SACK arrives). | |
5809 | */ | |
5810 | ||
1da177e4 LT |
5811 | /* Do some failure management (Section 8.2). */ |
5812 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
5813 | ||
1845a579 VY |
5814 | /* NB: Rules E4 and F1 are implicit in R1. */ |
5815 | sctp_add_cmd_sf(commands, SCTP_CMD_RETRAN, SCTP_TRANSPORT(transport)); | |
5816 | ||
1da177e4 LT |
5817 | return SCTP_DISPOSITION_CONSUME; |
5818 | } | |
5819 | ||
5820 | /* | |
5821 | * Generate delayed SACK on timeout | |
5822 | * | |
5823 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
5824 | * | |
5825 | * The guidelines on delayed acknowledgement algorithm specified in | |
5826 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
5827 | * acknowledgement SHOULD be generated for at least every second packet | |
5828 | * (not every second DATA chunk) received, and SHOULD be generated | |
5829 | * within 200 ms of the arrival of any unacknowledged DATA chunk. In | |
5830 | * some situations it may be beneficial for an SCTP transmitter to be | |
5831 | * more conservative than the algorithms detailed in this document | |
5832 | * allow. However, an SCTP transmitter MUST NOT be more aggressive than | |
5833 | * the following algorithms allow. | |
5834 | */ | |
172a1599 XL |
5835 | enum sctp_disposition sctp_sf_do_6_2_sack(struct net *net, |
5836 | const struct sctp_endpoint *ep, | |
5837 | const struct sctp_association *asoc, | |
5838 | const union sctp_subtype type, | |
5839 | void *arg, | |
5840 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5841 | { |
b01a2407 | 5842 | SCTP_INC_STATS(net, SCTP_MIB_DELAY_SACK_EXPIREDS); |
1da177e4 LT |
5843 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); |
5844 | return SCTP_DISPOSITION_CONSUME; | |
5845 | } | |
5846 | ||
5847 | /* | |
3f7a87d2 | 5848 | * sctp_sf_t1_init_timer_expire |
1da177e4 LT |
5849 | * |
5850 | * Section: 4 Note: 2 | |
5851 | * Verification Tag: | |
5852 | * Inputs | |
5853 | * (endpoint, asoc) | |
5854 | * | |
5855 | * RFC 2960 Section 4 Notes | |
5856 | * 2) If the T1-init timer expires, the endpoint MUST retransmit INIT | |
5857 | * and re-start the T1-init timer without changing state. This MUST | |
5858 | * be repeated up to 'Max.Init.Retransmits' times. After that, the | |
5859 | * endpoint MUST abort the initialization process and report the | |
5860 | * error to SCTP user. | |
5861 | * | |
3f7a87d2 FF |
5862 | * Outputs |
5863 | * (timers, events) | |
5864 | * | |
5865 | */ | |
172a1599 XL |
5866 | enum sctp_disposition sctp_sf_t1_init_timer_expire( |
5867 | struct net *net, | |
5868 | const struct sctp_endpoint *ep, | |
5869 | const struct sctp_association *asoc, | |
5870 | const union sctp_subtype type, | |
5871 | void *arg, | |
5872 | struct sctp_cmd_seq *commands) | |
3f7a87d2 | 5873 | { |
172a1599 | 5874 | int attempts = asoc->init_err_counter + 1; |
3f7a87d2 FF |
5875 | struct sctp_chunk *repl = NULL; |
5876 | struct sctp_bind_addr *bp; | |
3f7a87d2 | 5877 | |
bb33381d DB |
5878 | pr_debug("%s: timer T1 expired (INIT)\n", __func__); |
5879 | ||
b01a2407 | 5880 | SCTP_INC_STATS(net, SCTP_MIB_T1_INIT_EXPIREDS); |
3f7a87d2 | 5881 | |
81845c21 | 5882 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 FF |
5883 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; |
5884 | repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0); | |
5885 | if (!repl) | |
5886 | return SCTP_DISPOSITION_NOMEM; | |
5887 | ||
5888 | /* Choose transport for INIT. */ | |
5889 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
5890 | SCTP_CHUNK(repl)); | |
5891 | ||
5892 | /* Issue a sideeffect to do the needed accounting. */ | |
5893 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART, | |
5894 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5895 | ||
5896 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
5897 | } else { | |
bb33381d DB |
5898 | pr_debug("%s: giving up on INIT, attempts:%d " |
5899 | "max_init_attempts:%d\n", __func__, attempts, | |
5900 | asoc->max_init_attempts); | |
5901 | ||
8de8c873 SS |
5902 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5903 | SCTP_ERROR(ETIMEDOUT)); | |
3f7a87d2 | 5904 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5905 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
3f7a87d2 FF |
5906 | return SCTP_DISPOSITION_DELETE_TCB; |
5907 | } | |
5908 | ||
5909 | return SCTP_DISPOSITION_CONSUME; | |
5910 | } | |
5911 | ||
5912 | /* | |
5913 | * sctp_sf_t1_cookie_timer_expire | |
5914 | * | |
5915 | * Section: 4 Note: 2 | |
5916 | * Verification Tag: | |
5917 | * Inputs | |
5918 | * (endpoint, asoc) | |
5919 | * | |
5920 | * RFC 2960 Section 4 Notes | |
5921 | * 3) If the T1-cookie timer expires, the endpoint MUST retransmit | |
1da177e4 LT |
5922 | * COOKIE ECHO and re-start the T1-cookie timer without changing |
5923 | * state. This MUST be repeated up to 'Max.Init.Retransmits' times. | |
5924 | * After that, the endpoint MUST abort the initialization process and | |
5925 | * report the error to SCTP user. | |
5926 | * | |
5927 | * Outputs | |
5928 | * (timers, events) | |
5929 | * | |
5930 | */ | |
172a1599 XL |
5931 | enum sctp_disposition sctp_sf_t1_cookie_timer_expire( |
5932 | struct net *net, | |
5933 | const struct sctp_endpoint *ep, | |
5934 | const struct sctp_association *asoc, | |
5935 | const union sctp_subtype type, | |
5936 | void *arg, | |
5937 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5938 | { |
3f7a87d2 | 5939 | int attempts = asoc->init_err_counter + 1; |
172a1599 | 5940 | struct sctp_chunk *repl = NULL; |
1da177e4 | 5941 | |
bb33381d DB |
5942 | pr_debug("%s: timer T1 expired (COOKIE-ECHO)\n", __func__); |
5943 | ||
b01a2407 | 5944 | SCTP_INC_STATS(net, SCTP_MIB_T1_COOKIE_EXPIREDS); |
1da177e4 | 5945 | |
81845c21 | 5946 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 | 5947 | repl = sctp_make_cookie_echo(asoc, NULL); |
1da177e4 | 5948 | if (!repl) |
3f7a87d2 | 5949 | return SCTP_DISPOSITION_NOMEM; |
1da177e4 | 5950 | |
96cd0d3d VY |
5951 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, |
5952 | SCTP_CHUNK(repl)); | |
1da177e4 | 5953 | /* Issue a sideeffect to do the needed accounting. */ |
3f7a87d2 FF |
5954 | sctp_add_cmd_sf(commands, SCTP_CMD_COOKIEECHO_RESTART, |
5955 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
5956 | ||
1da177e4 LT |
5957 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
5958 | } else { | |
8de8c873 SS |
5959 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5960 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5961 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5962 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 LT |
5963 | return SCTP_DISPOSITION_DELETE_TCB; |
5964 | } | |
5965 | ||
5966 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5967 | } |
5968 | ||
5969 | /* RFC2960 9.2 If the timer expires, the endpoint must re-send the SHUTDOWN | |
5970 | * with the updated last sequential TSN received from its peer. | |
5971 | * | |
0c2c366e | 5972 | * An endpoint should limit the number of retransmission of the |
1da177e4 LT |
5973 | * SHUTDOWN chunk to the protocol parameter 'Association.Max.Retrans'. |
5974 | * If this threshold is exceeded the endpoint should destroy the TCB and | |
5975 | * MUST report the peer endpoint unreachable to the upper layer (and | |
5976 | * thus the association enters the CLOSED state). The reception of any | |
5977 | * packet from its peer (i.e. as the peer sends all of its queued DATA | |
5978 | * chunks) should clear the endpoint's retransmission count and restart | |
5979 | * the T2-Shutdown timer, giving its peer ample opportunity to transmit | |
5980 | * all of its queued DATA chunks that have not yet been sent. | |
5981 | */ | |
172a1599 XL |
5982 | enum sctp_disposition sctp_sf_t2_timer_expire( |
5983 | struct net *net, | |
5984 | const struct sctp_endpoint *ep, | |
5985 | const struct sctp_association *asoc, | |
5986 | const union sctp_subtype type, | |
5987 | void *arg, | |
5988 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5989 | { |
5990 | struct sctp_chunk *reply = NULL; | |
5991 | ||
bb33381d DB |
5992 | pr_debug("%s: timer T2 expired\n", __func__); |
5993 | ||
b01a2407 | 5994 | SCTP_INC_STATS(net, SCTP_MIB_T2_SHUTDOWN_EXPIREDS); |
ac0b0462 | 5995 | |
58fbbed4 NH |
5996 | ((struct sctp_association *)asoc)->shutdown_retries++; |
5997 | ||
1da177e4 | 5998 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
5999 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6000 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
6001 | /* Note: CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
6002 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 6003 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
6004 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6005 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
6006 | return SCTP_DISPOSITION_DELETE_TCB; |
6007 | } | |
6008 | ||
6009 | switch (asoc->state) { | |
6010 | case SCTP_STATE_SHUTDOWN_SENT: | |
6011 | reply = sctp_make_shutdown(asoc, NULL); | |
6012 | break; | |
6013 | ||
6014 | case SCTP_STATE_SHUTDOWN_ACK_SENT: | |
6015 | reply = sctp_make_shutdown_ack(asoc, NULL); | |
6016 | break; | |
6017 | ||
6018 | default: | |
6019 | BUG(); | |
6020 | break; | |
3ff50b79 | 6021 | } |
1da177e4 LT |
6022 | |
6023 | if (!reply) | |
6024 | goto nomem; | |
6025 | ||
6345b199 WY |
6026 | /* Do some failure management (Section 8.2). |
6027 | * If we remove the transport an SHUTDOWN was last sent to, don't | |
6028 | * do failure management. | |
6029 | */ | |
6030 | if (asoc->shutdown_last_sent_to) | |
6031 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
6032 | SCTP_TRANSPORT(asoc->shutdown_last_sent_to)); | |
1da177e4 LT |
6033 | |
6034 | /* Set the transport for the SHUTDOWN/ACK chunk and the timeout for | |
6035 | * the T2-shutdown timer. | |
6036 | */ | |
6037 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
6038 | ||
6039 | /* Restart the T2-shutdown timer. */ | |
6040 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
6041 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
6042 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
6043 | return SCTP_DISPOSITION_CONSUME; | |
6044 | ||
6045 | nomem: | |
6046 | return SCTP_DISPOSITION_NOMEM; | |
6047 | } | |
6048 | ||
6049 | /* | |
0c2c366e | 6050 | * ADDIP Section 4.1 ASCONF Chunk Procedures |
1da177e4 LT |
6051 | * If the T4 RTO timer expires the endpoint should do B1 to B5 |
6052 | */ | |
172a1599 XL |
6053 | enum sctp_disposition sctp_sf_t4_timer_expire( |
6054 | struct net *net, | |
6055 | const struct sctp_endpoint *ep, | |
6056 | const struct sctp_association *asoc, | |
6057 | const union sctp_subtype type, | |
6058 | void *arg, | |
6059 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6060 | { |
6061 | struct sctp_chunk *chunk = asoc->addip_last_asconf; | |
6062 | struct sctp_transport *transport = chunk->transport; | |
6063 | ||
b01a2407 | 6064 | SCTP_INC_STATS(net, SCTP_MIB_T4_RTO_EXPIREDS); |
ac0b0462 | 6065 | |
1da177e4 LT |
6066 | /* ADDIP 4.1 B1) Increment the error counters and perform path failure |
6067 | * detection on the appropriate destination address as defined in | |
6068 | * RFC2960 [5] section 8.1 and 8.2. | |
6069 | */ | |
10a43cea WY |
6070 | if (transport) |
6071 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
6072 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
6073 | |
6074 | /* Reconfig T4 timer and transport. */ | |
6075 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
6076 | ||
6077 | /* ADDIP 4.1 B2) Increment the association error counters and perform | |
6078 | * endpoint failure detection on the association as defined in | |
6079 | * RFC2960 [5] section 8.1 and 8.2. | |
6080 | * association error counter is incremented in SCTP_CMD_STRIKE. | |
6081 | */ | |
6082 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
6083 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
6084 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
8de8c873 SS |
6085 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6086 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 6087 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6088 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
6089 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6090 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
6091 | return SCTP_DISPOSITION_ABORT; |
6092 | } | |
6093 | ||
6094 | /* ADDIP 4.1 B3) Back-off the destination address RTO value to which | |
6095 | * the ASCONF chunk was sent by doubling the RTO timer value. | |
6096 | * This is done in SCTP_CMD_STRIKE. | |
6097 | */ | |
6098 | ||
6099 | /* ADDIP 4.1 B4) Re-transmit the ASCONF Chunk last sent and if possible | |
6100 | * choose an alternate destination address (please refer to RFC2960 | |
6101 | * [5] section 6.4.1). An endpoint MUST NOT add new parameters to this | |
d808ad9a | 6102 | * chunk, it MUST be the same (including its serial number) as the last |
1da177e4 LT |
6103 | * ASCONF sent. |
6104 | */ | |
6105 | sctp_chunk_hold(asoc->addip_last_asconf); | |
6106 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6107 | SCTP_CHUNK(asoc->addip_last_asconf)); | |
6108 | ||
6109 | /* ADDIP 4.1 B5) Restart the T-4 RTO timer. Note that if a different | |
6110 | * destination is selected, then the RTO used will be that of the new | |
6111 | * destination address. | |
6112 | */ | |
6113 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
6114 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
6115 | ||
6116 | return SCTP_DISPOSITION_CONSUME; | |
6117 | } | |
6118 | ||
6119 | /* sctpimpguide-05 Section 2.12.2 | |
6120 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
6121 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
6122 | * At the expiration of this timer the sender SHOULD abort the association | |
6123 | * by sending an ABORT chunk. | |
6124 | */ | |
172a1599 XL |
6125 | enum sctp_disposition sctp_sf_t5_timer_expire( |
6126 | struct net *net, | |
6127 | const struct sctp_endpoint *ep, | |
6128 | const struct sctp_association *asoc, | |
6129 | const union sctp_subtype type, | |
6130 | void *arg, | |
6131 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6132 | { |
6133 | struct sctp_chunk *reply = NULL; | |
6134 | ||
bb33381d DB |
6135 | pr_debug("%s: timer T5 expired\n", __func__); |
6136 | ||
b01a2407 | 6137 | SCTP_INC_STATS(net, SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS); |
1da177e4 LT |
6138 | |
6139 | reply = sctp_make_abort(asoc, NULL, 0); | |
6140 | if (!reply) | |
6141 | goto nomem; | |
6142 | ||
6143 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
8de8c873 SS |
6144 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6145 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 6146 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6147 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 | 6148 | |
b01a2407 EB |
6149 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6150 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
a1080a8b | 6151 | |
1da177e4 LT |
6152 | return SCTP_DISPOSITION_DELETE_TCB; |
6153 | nomem: | |
6154 | return SCTP_DISPOSITION_NOMEM; | |
6155 | } | |
6156 | ||
6157 | /* Handle expiration of AUTOCLOSE timer. When the autoclose timer expires, | |
6158 | * the association is automatically closed by starting the shutdown process. | |
6159 | * The work that needs to be done is same as when SHUTDOWN is initiated by | |
6160 | * the user. So this routine looks same as sctp_sf_do_9_2_prm_shutdown(). | |
6161 | */ | |
172a1599 XL |
6162 | enum sctp_disposition sctp_sf_autoclose_timer_expire( |
6163 | struct net *net, | |
6164 | const struct sctp_endpoint *ep, | |
6165 | const struct sctp_association *asoc, | |
6166 | const union sctp_subtype type, | |
6167 | void *arg, | |
6168 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6169 | { |
172a1599 | 6170 | enum sctp_disposition disposition; |
1da177e4 | 6171 | |
b01a2407 | 6172 | SCTP_INC_STATS(net, SCTP_MIB_AUTOCLOSE_EXPIREDS); |
ac0b0462 | 6173 | |
1da177e4 LT |
6174 | /* From 9.2 Shutdown of an Association |
6175 | * Upon receipt of the SHUTDOWN primitive from its upper | |
6176 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
6177 | * remains there until all outstanding data has been | |
6178 | * acknowledged by its peer. The endpoint accepts no new data | |
6179 | * from its upper layer, but retransmits data to the far end | |
6180 | * if necessary to fill gaps. | |
6181 | */ | |
6182 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
6183 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
6184 | ||
1da177e4 LT |
6185 | disposition = SCTP_DISPOSITION_CONSUME; |
6186 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 6187 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
22008f56 | 6188 | NULL, commands); |
1da177e4 | 6189 | } |
172a1599 | 6190 | |
1da177e4 LT |
6191 | return disposition; |
6192 | } | |
6193 | ||
6194 | /***************************************************************************** | |
6195 | * These are sa state functions which could apply to all types of events. | |
6196 | ****************************************************************************/ | |
6197 | ||
6198 | /* | |
6199 | * This table entry is not implemented. | |
6200 | * | |
6201 | * Inputs | |
6202 | * (endpoint, asoc, chunk) | |
6203 | * | |
6204 | * The return value is the disposition of the chunk. | |
6205 | */ | |
172a1599 XL |
6206 | enum sctp_disposition sctp_sf_not_impl(struct net *net, |
6207 | const struct sctp_endpoint *ep, | |
6208 | const struct sctp_association *asoc, | |
6209 | const union sctp_subtype type, | |
6210 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6211 | { |
6212 | return SCTP_DISPOSITION_NOT_IMPL; | |
6213 | } | |
6214 | ||
6215 | /* | |
6216 | * This table entry represents a bug. | |
6217 | * | |
6218 | * Inputs | |
6219 | * (endpoint, asoc, chunk) | |
6220 | * | |
6221 | * The return value is the disposition of the chunk. | |
6222 | */ | |
172a1599 XL |
6223 | enum sctp_disposition sctp_sf_bug(struct net *net, |
6224 | const struct sctp_endpoint *ep, | |
6225 | const struct sctp_association *asoc, | |
6226 | const union sctp_subtype type, | |
6227 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6228 | { |
6229 | return SCTP_DISPOSITION_BUG; | |
6230 | } | |
6231 | ||
6232 | /* | |
6233 | * This table entry represents the firing of a timer in the wrong state. | |
6234 | * Since timer deletion cannot be guaranteed a timer 'may' end up firing | |
6235 | * when the association is in the wrong state. This event should | |
6236 | * be ignored, so as to prevent any rearming of the timer. | |
6237 | * | |
6238 | * Inputs | |
6239 | * (endpoint, asoc, chunk) | |
6240 | * | |
6241 | * The return value is the disposition of the chunk. | |
6242 | */ | |
172a1599 XL |
6243 | enum sctp_disposition sctp_sf_timer_ignore(struct net *net, |
6244 | const struct sctp_endpoint *ep, | |
6245 | const struct sctp_association *asoc, | |
6246 | const union sctp_subtype type, | |
6247 | void *arg, | |
6248 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6249 | { |
bb33381d DB |
6250 | pr_debug("%s: timer %d ignored\n", __func__, type.chunk); |
6251 | ||
1da177e4 LT |
6252 | return SCTP_DISPOSITION_CONSUME; |
6253 | } | |
6254 | ||
6255 | /******************************************************************** | |
6256 | * 2nd Level Abstractions | |
6257 | ********************************************************************/ | |
6258 | ||
6259 | /* Pull the SACK chunk based on the SACK header. */ | |
6260 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk) | |
6261 | { | |
6262 | struct sctp_sackhdr *sack; | |
172a1599 | 6263 | __u16 num_dup_tsns; |
1da177e4 LT |
6264 | unsigned int len; |
6265 | __u16 num_blocks; | |
1da177e4 LT |
6266 | |
6267 | /* Protect ourselves from reading too far into | |
6268 | * the skb from a bogus sender. | |
6269 | */ | |
6270 | sack = (struct sctp_sackhdr *) chunk->skb->data; | |
6271 | ||
6272 | num_blocks = ntohs(sack->num_gap_ack_blocks); | |
6273 | num_dup_tsns = ntohs(sack->num_dup_tsns); | |
6274 | len = sizeof(struct sctp_sackhdr); | |
6275 | len += (num_blocks + num_dup_tsns) * sizeof(__u32); | |
6276 | if (len > chunk->skb->len) | |
6277 | return NULL; | |
6278 | ||
6279 | skb_pull(chunk->skb, len); | |
6280 | ||
6281 | return sack; | |
6282 | } | |
6283 | ||
6284 | /* Create an ABORT packet to be sent as a response, with the specified | |
6285 | * error causes. | |
6286 | */ | |
172a1599 XL |
6287 | static struct sctp_packet *sctp_abort_pkt_new( |
6288 | struct net *net, | |
6289 | const struct sctp_endpoint *ep, | |
6290 | const struct sctp_association *asoc, | |
6291 | struct sctp_chunk *chunk, | |
6292 | const void *payload, size_t paylen) | |
1da177e4 LT |
6293 | { |
6294 | struct sctp_packet *packet; | |
6295 | struct sctp_chunk *abort; | |
6296 | ||
2ce95503 | 6297 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6298 | |
6299 | if (packet) { | |
6300 | /* Make an ABORT. | |
6301 | * The T bit will be set if the asoc is NULL. | |
6302 | */ | |
6303 | abort = sctp_make_abort(asoc, chunk, paylen); | |
6304 | if (!abort) { | |
6305 | sctp_ootb_pkt_free(packet); | |
6306 | return NULL; | |
6307 | } | |
047a2428 JF |
6308 | |
6309 | /* Reflect vtag if T-Bit is set */ | |
6310 | if (sctp_test_T_bit(abort)) | |
6311 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
6312 | ||
1da177e4 LT |
6313 | /* Add specified error causes, i.e., payload, to the |
6314 | * end of the chunk. | |
6315 | */ | |
6316 | sctp_addto_chunk(abort, paylen, payload); | |
6317 | ||
6318 | /* Set the skb to the belonging sock for accounting. */ | |
6319 | abort->skb->sk = ep->base.sk; | |
6320 | ||
6321 | sctp_packet_append_chunk(packet, abort); | |
6322 | ||
6323 | } | |
6324 | ||
6325 | return packet; | |
6326 | } | |
6327 | ||
6328 | /* Allocate a packet for responding in the OOTB conditions. */ | |
172a1599 XL |
6329 | static struct sctp_packet *sctp_ootb_pkt_new( |
6330 | struct net *net, | |
6331 | const struct sctp_association *asoc, | |
6332 | const struct sctp_chunk *chunk) | |
1da177e4 | 6333 | { |
1da177e4 | 6334 | struct sctp_transport *transport; |
172a1599 XL |
6335 | struct sctp_packet *packet; |
6336 | __u16 sport, dport; | |
1da177e4 LT |
6337 | __u32 vtag; |
6338 | ||
6339 | /* Get the source and destination port from the inbound packet. */ | |
6340 | sport = ntohs(chunk->sctp_hdr->dest); | |
6341 | dport = ntohs(chunk->sctp_hdr->source); | |
6342 | ||
6343 | /* The V-tag is going to be the same as the inbound packet if no | |
6344 | * association exists, otherwise, use the peer's vtag. | |
6345 | */ | |
6346 | if (asoc) { | |
02c4e12c WY |
6347 | /* Special case the INIT-ACK as there is no peer's vtag |
6348 | * yet. | |
6349 | */ | |
cb3f837b | 6350 | switch (chunk->chunk_hdr->type) { |
4f7019c7 | 6351 | case SCTP_CID_INIT: |
02c4e12c WY |
6352 | case SCTP_CID_INIT_ACK: |
6353 | { | |
cb1844c4 | 6354 | struct sctp_initack_chunk *initack; |
02c4e12c | 6355 | |
cb1844c4 | 6356 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
02c4e12c WY |
6357 | vtag = ntohl(initack->init_hdr.init_tag); |
6358 | break; | |
6359 | } | |
6360 | default: | |
6361 | vtag = asoc->peer.i.init_tag; | |
6362 | break; | |
6363 | } | |
1da177e4 LT |
6364 | } else { |
6365 | /* Special case the INIT and stale COOKIE_ECHO as there is no | |
6366 | * vtag yet. | |
6367 | */ | |
cb3f837b | 6368 | switch (chunk->chunk_hdr->type) { |
1da177e4 LT |
6369 | case SCTP_CID_INIT: |
6370 | { | |
01a992be | 6371 | struct sctp_init_chunk *init; |
1da177e4 | 6372 | |
01a992be | 6373 | init = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
6374 | vtag = ntohl(init->init_hdr.init_tag); |
6375 | break; | |
6376 | } | |
d808ad9a | 6377 | default: |
1da177e4 LT |
6378 | vtag = ntohl(chunk->sctp_hdr->vtag); |
6379 | break; | |
6380 | } | |
6381 | } | |
6382 | ||
6383 | /* Make a transport for the bucket, Eliza... */ | |
89bf3450 | 6384 | transport = sctp_transport_new(net, sctp_source(chunk), GFP_ATOMIC); |
1da177e4 LT |
6385 | if (!transport) |
6386 | goto nomem; | |
6387 | ||
a1dd2cf2 XL |
6388 | transport->encap_port = SCTP_INPUT_CB(chunk->skb)->encap_port; |
6389 | ||
1da177e4 LT |
6390 | /* Cache a route for the transport with the chunk's destination as |
6391 | * the source address. | |
6392 | */ | |
16b0a030 | 6393 | sctp_transport_route(transport, (union sctp_addr *)&chunk->dest, |
2ce95503 | 6394 | sctp_sk(net->sctp.ctl_sock)); |
1da177e4 | 6395 | |
66b91d2c MRL |
6396 | packet = &transport->packet; |
6397 | sctp_packet_init(packet, transport, sport, dport); | |
6398 | sctp_packet_config(packet, vtag, 0); | |
1da177e4 LT |
6399 | |
6400 | return packet; | |
6401 | ||
6402 | nomem: | |
6403 | return NULL; | |
6404 | } | |
6405 | ||
6406 | /* Free the packet allocated earlier for responding in the OOTB condition. */ | |
6407 | void sctp_ootb_pkt_free(struct sctp_packet *packet) | |
6408 | { | |
6409 | sctp_transport_free(packet->transport); | |
6410 | } | |
6411 | ||
6412 | /* Send a stale cookie error when a invalid COOKIE ECHO chunk is found */ | |
24cb81a6 EB |
6413 | static void sctp_send_stale_cookie_err(struct net *net, |
6414 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
6415 | const struct sctp_association *asoc, |
6416 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 6417 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
6418 | struct sctp_chunk *err_chunk) |
6419 | { | |
6420 | struct sctp_packet *packet; | |
6421 | ||
6422 | if (err_chunk) { | |
2ce95503 | 6423 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6424 | if (packet) { |
6425 | struct sctp_signed_cookie *cookie; | |
6426 | ||
6427 | /* Override the OOTB vtag from the cookie. */ | |
6428 | cookie = chunk->subh.cookie_hdr; | |
6429 | packet->vtag = cookie->c.peer_vtag; | |
d808ad9a | 6430 | |
1da177e4 LT |
6431 | /* Set the skb to the belonging sock for accounting. */ |
6432 | err_chunk->skb->sk = ep->base.sk; | |
6433 | sctp_packet_append_chunk(packet, err_chunk); | |
6434 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
6435 | SCTP_PACKET(packet)); | |
b01a2407 | 6436 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
6437 | } else |
6438 | sctp_chunk_free (err_chunk); | |
6439 | } | |
6440 | } | |
6441 | ||
6442 | ||
6443 | /* Process a data chunk */ | |
6444 | static int sctp_eat_data(const struct sctp_association *asoc, | |
6445 | struct sctp_chunk *chunk, | |
a85bbeb2 | 6446 | struct sctp_cmd_seq *commands) |
1da177e4 | 6447 | { |
7c3ceb4f | 6448 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
049b3ff5 | 6449 | struct sock *sk = asoc->base.sk; |
24cb81a6 | 6450 | struct net *net = sock_net(sk); |
172a1599 XL |
6451 | struct sctp_datahdr *data_hdr; |
6452 | struct sctp_chunk *err; | |
6453 | enum sctp_verb deliver; | |
6454 | size_t datalen; | |
172a1599 XL |
6455 | __u32 tsn; |
6456 | int tmp; | |
1da177e4 | 6457 | |
3583df1a XL |
6458 | data_hdr = (struct sctp_datahdr *)chunk->skb->data; |
6459 | chunk->subh.data_hdr = data_hdr; | |
9d4ceaf1 | 6460 | skb_pull(chunk->skb, sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
6461 | |
6462 | tsn = ntohl(data_hdr->tsn); | |
bb33381d | 6463 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
6464 | |
6465 | /* ASSERT: Now skb->data is really the user data. */ | |
6466 | ||
6467 | /* Process ECN based congestion. | |
6468 | * | |
6469 | * Since the chunk structure is reused for all chunks within | |
6470 | * a packet, we use ecn_ce_done to track if we've already | |
6471 | * done CE processing for this packet. | |
6472 | * | |
6473 | * We need to do ECN processing even if we plan to discard the | |
6474 | * chunk later. | |
6475 | */ | |
6476 | ||
2d47fd12 | 6477 | if (asoc->peer.ecn_capable && !chunk->ecn_ce_done) { |
e7487c86 | 6478 | struct sctp_af *af = SCTP_INPUT_CB(chunk->skb)->af; |
1da177e4 LT |
6479 | chunk->ecn_ce_done = 1; |
6480 | ||
2d47fd12 | 6481 | if (af->is_ce(sctp_gso_headskb(chunk->skb))) { |
0c2c366e | 6482 | /* Do real work as side effect. */ |
1da177e4 LT |
6483 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_CE, |
6484 | SCTP_U32(tsn)); | |
6485 | } | |
6486 | } | |
6487 | ||
6488 | tmp = sctp_tsnmap_check(&asoc->peer.tsn_map, tsn); | |
6489 | if (tmp < 0) { | |
6490 | /* The TSN is too high--silently discard the chunk and | |
6491 | * count on it getting retransmitted later. | |
6492 | */ | |
196d6759 MB |
6493 | if (chunk->asoc) |
6494 | chunk->asoc->stats.outofseqtsns++; | |
1da177e4 LT |
6495 | return SCTP_IERROR_HIGH_TSN; |
6496 | } else if (tmp > 0) { | |
6497 | /* This is a duplicate. Record it. */ | |
6498 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_DUP, SCTP_U32(tsn)); | |
6499 | return SCTP_IERROR_DUP_TSN; | |
6500 | } | |
6501 | ||
6502 | /* This is a new TSN. */ | |
6503 | ||
6504 | /* Discard if there is no room in the receive window. | |
6505 | * Actually, allow a little bit of overflow (up to a MTU). | |
6506 | */ | |
6507 | datalen = ntohs(chunk->chunk_hdr->length); | |
9d4ceaf1 | 6508 | datalen -= sctp_datachk_len(&asoc->stream); |
1da177e4 LT |
6509 | |
6510 | deliver = SCTP_CMD_CHUNK_ULP; | |
6511 | ||
6512 | /* Think about partial delivery. */ | |
6513 | if ((datalen >= asoc->rwnd) && (!asoc->ulpq.pd_mode)) { | |
6514 | ||
6515 | /* Even if we don't accept this chunk there is | |
6516 | * memory pressure. | |
6517 | */ | |
6518 | sctp_add_cmd_sf(commands, SCTP_CMD_PART_DELIVER, SCTP_NULL()); | |
6519 | } | |
6520 | ||
d808ad9a | 6521 | /* Spill over rwnd a little bit. Note: While allowed, this spill over |
1da177e4 LT |
6522 | * seems a bit troublesome in that frag_point varies based on |
6523 | * PMTU. In cases, such as loopback, this might be a rather | |
6524 | * large spill over. | |
4d93df0a | 6525 | */ |
362d5204 | 6526 | if ((!chunk->data_accepted) && (!asoc->rwnd || asoc->rwnd_over || |
4d93df0a | 6527 | (datalen > asoc->rwnd + asoc->frag_point))) { |
1da177e4 LT |
6528 | |
6529 | /* If this is the next TSN, consider reneging to make | |
6530 | * room. Note: Playing nice with a confused sender. A | |
6531 | * malicious sender can still eat up all our buffer | |
6532 | * space and in the future we may want to detect and | |
6533 | * do more drastic reneging. | |
6534 | */ | |
7c3ceb4f NH |
6535 | if (sctp_tsnmap_has_gap(map) && |
6536 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { | |
bb33381d | 6537 | pr_debug("%s: reneging for tsn:%u\n", __func__, tsn); |
1da177e4 LT |
6538 | deliver = SCTP_CMD_RENEGE; |
6539 | } else { | |
bb33381d DB |
6540 | pr_debug("%s: discard tsn:%u len:%zu, rwnd:%d\n", |
6541 | __func__, tsn, datalen, asoc->rwnd); | |
6542 | ||
1da177e4 LT |
6543 | return SCTP_IERROR_IGNORE_TSN; |
6544 | } | |
6545 | } | |
6546 | ||
4d93df0a NH |
6547 | /* |
6548 | * Also try to renege to limit our memory usage in the event that | |
6549 | * we are under memory pressure | |
3ab224be | 6550 | * If we can't renege, don't worry about it, the sk_rmem_schedule |
4d93df0a NH |
6551 | * in sctp_ulpevent_make_rcvmsg will drop the frame if we grow our |
6552 | * memory usage too much | |
6553 | */ | |
9dde27de | 6554 | if (sk_under_memory_pressure(sk)) { |
4d93df0a | 6555 | if (sctp_tsnmap_has_gap(map) && |
f7010e61 | 6556 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { |
bb33381d DB |
6557 | pr_debug("%s: under pressure, reneging for tsn:%u\n", |
6558 | __func__, tsn); | |
4d93df0a | 6559 | deliver = SCTP_CMD_RENEGE; |
9dde27de XL |
6560 | } else { |
6561 | sk_mem_reclaim(sk); | |
6562 | } | |
4d93df0a NH |
6563 | } |
6564 | ||
1da177e4 LT |
6565 | /* |
6566 | * Section 3.3.10.9 No User Data (9) | |
6567 | * | |
6568 | * Cause of error | |
6569 | * --------------- | |
6570 | * No User Data: This error cause is returned to the originator of a | |
6571 | * DATA chunk if a received DATA chunk has no user data. | |
6572 | */ | |
6573 | if (unlikely(0 == datalen)) { | |
6574 | err = sctp_make_abort_no_data(asoc, chunk, tsn); | |
6575 | if (err) { | |
6576 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6577 | SCTP_CHUNK(err)); | |
6578 | } | |
6579 | /* We are going to ABORT, so we might as well stop | |
6580 | * processing the rest of the chunks in the packet. | |
6581 | */ | |
cb3f837b | 6582 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 SS |
6583 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6584 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 | 6585 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6586 | SCTP_PERR(SCTP_ERROR_NO_DATA)); |
b01a2407 EB |
6587 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6588 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
6589 | return SCTP_IERROR_NO_DATA; |
6590 | } | |
6591 | ||
9faa730f SS |
6592 | chunk->data_accepted = 1; |
6593 | ||
1da177e4 LT |
6594 | /* Note: Some chunks may get overcounted (if we drop) or overcounted |
6595 | * if we renege and the chunk arrives again. | |
6596 | */ | |
196d6759 | 6597 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
b01a2407 | 6598 | SCTP_INC_STATS(net, SCTP_MIB_INUNORDERCHUNKS); |
196d6759 MB |
6599 | if (chunk->asoc) |
6600 | chunk->asoc->stats.iuodchunks++; | |
6601 | } else { | |
b01a2407 | 6602 | SCTP_INC_STATS(net, SCTP_MIB_INORDERCHUNKS); |
196d6759 MB |
6603 | if (chunk->asoc) |
6604 | chunk->asoc->stats.iodchunks++; | |
f1751c57 | 6605 | } |
1da177e4 LT |
6606 | |
6607 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
6608 | * | |
6609 | * If an endpoint receive a DATA chunk with an invalid stream | |
6610 | * identifier, it shall acknowledge the reception of the DATA chunk | |
6611 | * following the normal procedure, immediately send an ERROR chunk | |
6612 | * with cause set to "Invalid Stream Identifier" (See Section 3.3.10) | |
6613 | * and discard the DATA chunk. | |
6614 | */ | |
9d4ceaf1 | 6615 | if (ntohs(data_hdr->stream) >= asoc->stream.incnt) { |
3888e9ef VY |
6616 | /* Mark tsn as received even though we drop it */ |
6617 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_TSN, SCTP_U32(tsn)); | |
6618 | ||
1da177e4 LT |
6619 | err = sctp_make_op_error(asoc, chunk, SCTP_ERROR_INV_STRM, |
6620 | &data_hdr->stream, | |
6383cfb3 VY |
6621 | sizeof(data_hdr->stream), |
6622 | sizeof(u16)); | |
1da177e4 LT |
6623 | if (err) |
6624 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6625 | SCTP_CHUNK(err)); | |
6626 | return SCTP_IERROR_BAD_STREAM; | |
6627 | } | |
6628 | ||
f1751c57 VY |
6629 | /* Check to see if the SSN is possible for this TSN. |
6630 | * The biggest gap we can record is 4K wide. Since SSNs wrap | |
6631 | * at an unsigned short, there is no way that an SSN can | |
6632 | * wrap and for a valid TSN. We can simply check if the current | |
6633 | * SSN is smaller then the next expected one. If it is, it wrapped | |
6634 | * and is invalid. | |
6635 | */ | |
9d4ceaf1 | 6636 | if (!asoc->stream.si->validate_data(chunk)) |
f1751c57 | 6637 | return SCTP_IERROR_PROTO_VIOLATION; |
f1751c57 | 6638 | |
1da177e4 LT |
6639 | /* Send the data up to the user. Note: Schedule the |
6640 | * SCTP_CMD_CHUNK_ULP cmd before the SCTP_CMD_GEN_SACK, as the SACK | |
6641 | * chunk needs the updated rwnd. | |
6642 | */ | |
6643 | sctp_add_cmd_sf(commands, deliver, SCTP_CHUNK(chunk)); | |
6644 | ||
6645 | return SCTP_IERROR_NO_ERROR; | |
6646 | } |