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); |
1da177e4 LT |
90 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk); |
91 | ||
172a1599 XL |
92 | static enum sctp_disposition sctp_stop_t1_and_abort( |
93 | struct net *net, | |
94 | struct sctp_cmd_seq *commands, | |
95 | __be16 error, int sk_err, | |
96 | const struct sctp_association *asoc, | |
97 | struct sctp_transport *transport); | |
52c1da39 | 98 | |
172a1599 XL |
99 | static enum sctp_disposition sctp_sf_abort_violation( |
100 | struct net *net, | |
101 | const struct sctp_endpoint *ep, | |
102 | const struct sctp_association *asoc, | |
103 | void *arg, | |
104 | struct sctp_cmd_seq *commands, | |
105 | const __u8 *payload, | |
106 | const size_t paylen); | |
aecedeab | 107 | |
172a1599 XL |
108 | static enum sctp_disposition sctp_sf_violation_chunklen( |
109 | struct net *net, | |
110 | const struct sctp_endpoint *ep, | |
111 | const struct sctp_association *asoc, | |
112 | const union sctp_subtype type, | |
113 | void *arg, | |
114 | struct sctp_cmd_seq *commands); | |
1da177e4 | 115 | |
172a1599 XL |
116 | static enum sctp_disposition sctp_sf_violation_paramlen( |
117 | struct net *net, | |
118 | const struct sctp_endpoint *ep, | |
119 | const struct sctp_association *asoc, | |
120 | const union sctp_subtype type, | |
121 | void *arg, void *ext, | |
122 | struct sctp_cmd_seq *commands); | |
6f4c618d | 123 | |
172a1599 XL |
124 | static enum sctp_disposition sctp_sf_violation_ctsn( |
125 | struct net *net, | |
126 | const struct sctp_endpoint *ep, | |
127 | const struct sctp_association *asoc, | |
128 | const union sctp_subtype type, | |
129 | void *arg, | |
130 | struct sctp_cmd_seq *commands); | |
aecedeab | 131 | |
172a1599 XL |
132 | static enum sctp_disposition sctp_sf_violation_chunk( |
133 | struct net *net, | |
134 | const struct sctp_endpoint *ep, | |
135 | const struct sctp_association *asoc, | |
136 | const union sctp_subtype type, | |
137 | void *arg, | |
138 | struct sctp_cmd_seq *commands); | |
ece25dfa | 139 | |
4785c7ae | 140 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 | 141 | const struct sctp_association *asoc, |
172a1599 | 142 | struct sctp_chunk *chunk); |
bbd0d598 | 143 | |
172a1599 XL |
144 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
145 | struct net *net, | |
24cb81a6 | 146 | const struct sctp_endpoint *ep, |
75205f47 | 147 | const struct sctp_association *asoc, |
bfc6f827 | 148 | const union sctp_subtype type, |
75205f47 | 149 | void *arg, |
a85bbeb2 | 150 | struct sctp_cmd_seq *commands); |
75205f47 | 151 | |
1da177e4 LT |
152 | /* Small helper function that checks if the chunk length |
153 | * is of the appropriate length. The 'required_length' argument | |
154 | * is set to be the size of a specific chunk we are testing. | |
509e7a31 MRL |
155 | * Return Values: true = Valid length |
156 | * false = Invalid length | |
1da177e4 LT |
157 | * |
158 | */ | |
172a1599 XL |
159 | static inline bool sctp_chunk_length_valid(struct sctp_chunk *chunk, |
160 | __u16 required_length) | |
1da177e4 LT |
161 | { |
162 | __u16 chunk_length = ntohs(chunk->chunk_hdr->length); | |
163 | ||
26b87c78 DB |
164 | /* Previously already marked? */ |
165 | if (unlikely(chunk->pdiscard)) | |
509e7a31 | 166 | return false; |
1da177e4 | 167 | if (unlikely(chunk_length < required_length)) |
509e7a31 | 168 | return false; |
1da177e4 | 169 | |
509e7a31 | 170 | return true; |
1da177e4 LT |
171 | } |
172 | ||
173 | /********************************************************** | |
174 | * These are the state functions for handling chunk events. | |
175 | **********************************************************/ | |
176 | ||
177 | /* | |
178 | * Process the final SHUTDOWN COMPLETE. | |
179 | * | |
180 | * Section: 4 (C) (diagram), 9.2 | |
181 | * Upon reception of the SHUTDOWN COMPLETE chunk the endpoint will verify | |
182 | * that it is in SHUTDOWN-ACK-SENT state, if it is not the chunk should be | |
183 | * discarded. If the endpoint is in the SHUTDOWN-ACK-SENT state the endpoint | |
184 | * should stop the T2-shutdown timer and remove all knowledge of the | |
185 | * association (and thus the association enters the CLOSED state). | |
186 | * | |
047a2428 | 187 | * Verification Tag: 8.5.1(C), sctpimpguide 2.41. |
1da177e4 LT |
188 | * C) Rules for packet carrying SHUTDOWN COMPLETE: |
189 | * ... | |
047a2428 JF |
190 | * - The receiver of a SHUTDOWN COMPLETE shall accept the packet |
191 | * if the Verification Tag field of the packet matches its own tag and | |
192 | * the T bit is not set | |
193 | * OR | |
194 | * it is set to its peer's tag and the T bit is set in the Chunk | |
195 | * Flags. | |
196 | * Otherwise, the receiver MUST silently discard the packet | |
197 | * and take no further action. An endpoint MUST ignore the | |
198 | * SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state. | |
1da177e4 LT |
199 | * |
200 | * Inputs | |
201 | * (endpoint, asoc, chunk) | |
202 | * | |
203 | * Outputs | |
204 | * (asoc, reply_msg, msg_up, timers, counters) | |
205 | * | |
206 | * The return value is the disposition of the chunk. | |
207 | */ | |
172a1599 XL |
208 | enum sctp_disposition sctp_sf_do_4_C(struct net *net, |
209 | const struct sctp_endpoint *ep, | |
210 | const struct sctp_association *asoc, | |
211 | const union sctp_subtype type, | |
212 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
213 | { |
214 | struct sctp_chunk *chunk = arg; | |
215 | struct sctp_ulpevent *ev; | |
216 | ||
ece25dfa | 217 | if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6 | 218 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
ece25dfa | 219 | |
1da177e4 LT |
220 | /* RFC 2960 6.10 Bundling |
221 | * | |
222 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
223 | * SHUTDOWN COMPLETE with any other chunks. | |
224 | */ | |
225 | if (!chunk->singleton) | |
24cb81a6 | 226 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 227 | |
ece25dfa | 228 | /* Make sure that the SHUTDOWN_COMPLETE chunk has a valid length. */ |
922dbc5b | 229 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 230 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 231 | commands); |
1da177e4 LT |
232 | |
233 | /* RFC 2960 10.2 SCTP-to-ULP | |
234 | * | |
235 | * H) SHUTDOWN COMPLETE notification | |
236 | * | |
237 | * When SCTP completes the shutdown procedures (section 9.2) this | |
238 | * notification is passed to the upper layer. | |
239 | */ | |
240 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 241 | 0, 0, 0, NULL, GFP_ATOMIC); |
df7deeb5 VY |
242 | if (ev) |
243 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
d808ad9a | 244 | SCTP_ULPEVENT(ev)); |
1da177e4 LT |
245 | |
246 | /* Upon reception of the SHUTDOWN COMPLETE chunk the endpoint | |
247 | * will verify that it is in SHUTDOWN-ACK-SENT state, if it is | |
248 | * not the chunk should be discarded. If the endpoint is in | |
249 | * the SHUTDOWN-ACK-SENT state the endpoint should stop the | |
250 | * T2-shutdown timer and remove all knowledge of the | |
251 | * association (and thus the association enters the CLOSED | |
252 | * state). | |
253 | */ | |
254 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
255 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
256 | ||
257 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
258 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
259 | ||
260 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
261 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
262 | ||
b01a2407 EB |
263 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
264 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
265 | |
266 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
267 | ||
268 | return SCTP_DISPOSITION_DELETE_TCB; | |
1da177e4 LT |
269 | } |
270 | ||
271 | /* | |
272 | * Respond to a normal INIT chunk. | |
273 | * We are the side that is being asked for an association. | |
274 | * | |
275 | * Section: 5.1 Normal Establishment of an Association, B | |
276 | * B) "Z" shall respond immediately with an INIT ACK chunk. The | |
277 | * destination IP address of the INIT ACK MUST be set to the source | |
278 | * IP address of the INIT to which this INIT ACK is responding. In | |
279 | * the response, besides filling in other parameters, "Z" must set the | |
280 | * Verification Tag field to Tag_A, and also provide its own | |
281 | * Verification Tag (Tag_Z) in the Initiate Tag field. | |
282 | * | |
d808ad9a | 283 | * Verification Tag: Must be 0. |
1da177e4 LT |
284 | * |
285 | * Inputs | |
286 | * (endpoint, asoc, chunk) | |
287 | * | |
288 | * Outputs | |
289 | * (asoc, reply_msg, msg_up, timers, counters) | |
290 | * | |
291 | * The return value is the disposition of the chunk. | |
292 | */ | |
172a1599 XL |
293 | enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net, |
294 | const struct sctp_endpoint *ep, | |
295 | const struct sctp_association *asoc, | |
296 | const union sctp_subtype type, | |
297 | void *arg, | |
298 | struct sctp_cmd_seq *commands) | |
1da177e4 | 299 | { |
62e6b7e4 XL |
300 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
301 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 302 | struct sctp_association *new_asoc; |
1da177e4 | 303 | struct sctp_packet *packet; |
1da177e4 LT |
304 | int len; |
305 | ||
2277c7cd RH |
306 | /* Update socket peer label if first association. */ |
307 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
308 | chunk->skb)) | |
309 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
310 | ||
1da177e4 LT |
311 | /* 6.10 Bundling |
312 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
313 | * SHUTDOWN COMPLETE with any other chunks. | |
d808ad9a | 314 | * |
1da177e4 LT |
315 | * IG Section 2.11.2 |
316 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
317 | * enforce these rules by silently discarding an arriving packet | |
318 | * with an INIT chunk that is bundled with other chunks. | |
319 | */ | |
320 | if (!chunk->singleton) | |
24cb81a6 | 321 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
322 | |
323 | /* If the packet is an OOTB packet which is temporarily on the | |
324 | * control endpoint, respond with an ABORT. | |
325 | */ | |
2ce95503 | 326 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 327 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 328 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 329 | } |
1da177e4 | 330 | |
1da177e4 | 331 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification |
d808ad9a | 332 | * Tag. |
1da177e4 LT |
333 | */ |
334 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 335 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
336 | |
337 | /* Make sure that the INIT chunk has a valid length. | |
338 | * Normally, this would cause an ABORT with a Protocol Violation | |
339 | * error, but since we don't have an association, we'll | |
340 | * just discard the packet. | |
341 | */ | |
01a992be | 342 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 343 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 344 | |
bec9640b VY |
345 | /* If the INIT is coming toward a closing socket, we'll send back |
346 | * and ABORT. Essentially, this catches the race of INIT being | |
347 | * backloged to the socket at the same time as the user isses close(). | |
348 | * Since the socket and all its associations are going away, we | |
349 | * can treat this OOTB | |
350 | */ | |
351 | if (sctp_sstate(ep->base.sk, CLOSING)) | |
24cb81a6 | 352 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
bec9640b | 353 | |
1da177e4 LT |
354 | /* Verify the INIT chunk before processing it. */ |
355 | err_chunk = NULL; | |
b14878cc | 356 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 357 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
358 | &err_chunk)) { |
359 | /* This chunk contains fatal error. It is to be discarded. | |
360 | * Send an ABORT, with causes if there is any. | |
361 | */ | |
362 | if (err_chunk) { | |
24cb81a6 | 363 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 364 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 365 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 366 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 367 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
368 | |
369 | sctp_chunk_free(err_chunk); | |
370 | ||
371 | if (packet) { | |
372 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
373 | SCTP_PACKET(packet)); | |
b01a2407 | 374 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
375 | return SCTP_DISPOSITION_CONSUME; |
376 | } else { | |
377 | return SCTP_DISPOSITION_NOMEM; | |
378 | } | |
379 | } else { | |
24cb81a6 | 380 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
381 | commands); |
382 | } | |
383 | } | |
384 | ||
d808ad9a | 385 | /* Grab the INIT header. */ |
4ae70c08 | 386 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
387 | |
388 | /* Tag the variable length parameters. */ | |
4ae70c08 | 389 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
390 | |
391 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
392 | if (!new_asoc) | |
393 | goto nomem; | |
394 | ||
409b95af VY |
395 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
396 | sctp_scope(sctp_source(chunk)), | |
397 | GFP_ATOMIC) < 0) | |
398 | goto nomem_init; | |
399 | ||
1da177e4 | 400 | /* The call, sctp_process_init(), can fail on memory allocation. */ |
de6becdc | 401 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 402 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
1da177e4 LT |
403 | GFP_ATOMIC)) |
404 | goto nomem_init; | |
405 | ||
1da177e4 LT |
406 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ |
407 | ||
408 | /* If there are errors need to be reported for unknown parameters, | |
409 | * make sure to reserve enough room in the INIT ACK for them. | |
410 | */ | |
411 | len = 0; | |
412 | if (err_chunk) | |
413 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 414 | sizeof(struct sctp_chunkhdr); |
1da177e4 | 415 | |
1da177e4 LT |
416 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
417 | if (!repl) | |
df7deeb5 | 418 | goto nomem_init; |
1da177e4 LT |
419 | |
420 | /* If there are errors need to be reported for unknown parameters, | |
421 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
422 | * parameter. | |
423 | */ | |
424 | if (err_chunk) { | |
425 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
426 | * ERROR chunk generated by sctp_verify_init(). Since the | |
427 | * error cause code for "unknown parameter" and the | |
428 | * "Unrecognized parameter" type is the same, we can | |
429 | * construct the parameters in INIT ACK by copying the | |
430 | * ERROR causes over. | |
431 | */ | |
62e6b7e4 | 432 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 433 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 434 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
435 | /* Replace the cause code with the "Unrecognized parameter" |
436 | * parameter type. | |
437 | */ | |
438 | sctp_addto_chunk(repl, len, unk_param); | |
439 | sctp_chunk_free(err_chunk); | |
440 | } | |
441 | ||
df7deeb5 VY |
442 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); |
443 | ||
1da177e4 LT |
444 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
445 | ||
446 | /* | |
447 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
448 | * "Z" MUST NOT allocate any resources, nor keep any states for the | |
449 | * new association. Otherwise, "Z" will be vulnerable to resource | |
450 | * attacks. | |
451 | */ | |
452 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
453 | ||
454 | return SCTP_DISPOSITION_DELETE_TCB; | |
455 | ||
1da177e4 LT |
456 | nomem_init: |
457 | sctp_association_free(new_asoc); | |
458 | nomem: | |
df7deeb5 VY |
459 | if (err_chunk) |
460 | sctp_chunk_free(err_chunk); | |
1da177e4 LT |
461 | return SCTP_DISPOSITION_NOMEM; |
462 | } | |
463 | ||
464 | /* | |
465 | * Respond to a normal INIT ACK chunk. | |
466 | * We are the side that is initiating the association. | |
467 | * | |
468 | * Section: 5.1 Normal Establishment of an Association, C | |
469 | * C) Upon reception of the INIT ACK from "Z", "A" shall stop the T1-init | |
470 | * timer and leave COOKIE-WAIT state. "A" shall then send the State | |
471 | * Cookie received in the INIT ACK chunk in a COOKIE ECHO chunk, start | |
472 | * the T1-cookie timer, and enter the COOKIE-ECHOED state. | |
473 | * | |
474 | * Note: The COOKIE ECHO chunk can be bundled with any pending outbound | |
475 | * DATA chunks, but it MUST be the first chunk in the packet and | |
476 | * until the COOKIE ACK is returned the sender MUST NOT send any | |
477 | * other packets to the peer. | |
478 | * | |
479 | * Verification Tag: 3.3.3 | |
480 | * If the value of the Initiate Tag in a received INIT ACK chunk is | |
481 | * found to be 0, the receiver MUST treat it as an error and close the | |
482 | * association by transmitting an ABORT. | |
483 | * | |
484 | * Inputs | |
485 | * (endpoint, asoc, chunk) | |
486 | * | |
487 | * Outputs | |
488 | * (asoc, reply_msg, msg_up, timers, counters) | |
489 | * | |
490 | * The return value is the disposition of the chunk. | |
491 | */ | |
172a1599 XL |
492 | enum sctp_disposition sctp_sf_do_5_1C_ack(struct net *net, |
493 | const struct sctp_endpoint *ep, | |
494 | const struct sctp_association *asoc, | |
495 | const union sctp_subtype type, | |
496 | void *arg, | |
497 | struct sctp_cmd_seq *commands) | |
1da177e4 | 498 | { |
01a992be | 499 | struct sctp_init_chunk *initchunk; |
172a1599 | 500 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
501 | struct sctp_chunk *err_chunk; |
502 | struct sctp_packet *packet; | |
1da177e4 LT |
503 | |
504 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 505 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 506 | |
1da177e4 LT |
507 | /* 6.10 Bundling |
508 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
509 | * SHUTDOWN COMPLETE with any other chunks. | |
510 | */ | |
511 | if (!chunk->singleton) | |
24cb81a6 | 512 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 513 | |
ece25dfa | 514 | /* Make sure that the INIT-ACK chunk has a valid length */ |
cb1844c4 | 515 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_initack_chunk))) |
24cb81a6 | 516 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 517 | commands); |
1da177e4 | 518 | /* Grab the INIT header. */ |
4ae70c08 | 519 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 | 520 | |
1da177e4 LT |
521 | /* Verify the INIT chunk before processing it. */ |
522 | err_chunk = NULL; | |
b14878cc | 523 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 524 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
525 | &err_chunk)) { |
526 | ||
2a493216 | 527 | enum sctp_error error = SCTP_ERROR_NO_RESOURCE; |
853f4b50 | 528 | |
1da177e4 | 529 | /* This chunk contains fatal error. It is to be discarded. |
d6701191 VY |
530 | * Send an ABORT, with causes. If there are no causes, |
531 | * then there wasn't enough memory. Just terminate | |
532 | * the association. | |
1da177e4 LT |
533 | */ |
534 | if (err_chunk) { | |
24cb81a6 | 535 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 536 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 537 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 538 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 539 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
540 | |
541 | sctp_chunk_free(err_chunk); | |
542 | ||
543 | if (packet) { | |
544 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
545 | SCTP_PACKET(packet)); | |
24cb81a6 | 546 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
8de8c873 | 547 | error = SCTP_ERROR_INV_PARAM; |
1da177e4 | 548 | } |
1da177e4 | 549 | } |
bbd0d598 VY |
550 | |
551 | /* SCTP-AUTH, Section 6.3: | |
552 | * It should be noted that if the receiver wants to tear | |
553 | * down an association in an authenticated way only, the | |
554 | * handling of malformed packets should not result in | |
555 | * tearing down the association. | |
556 | * | |
557 | * This means that if we only want to abort associations | |
558 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 559 | * can't destroy this association just because the packet |
bbd0d598 VY |
560 | * was malformed. |
561 | */ | |
562 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
24cb81a6 | 563 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 | 564 | |
24cb81a6 EB |
565 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
566 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, | |
8de8c873 | 567 | asoc, chunk->transport); |
1da177e4 LT |
568 | } |
569 | ||
570 | /* Tag the variable length parameters. Note that we never | |
571 | * convert the parameters in an INIT chunk. | |
572 | */ | |
4ae70c08 | 573 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 | 574 | |
01a992be | 575 | initchunk = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
576 | |
577 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_INIT, | |
578 | SCTP_PEER_INIT(initchunk)); | |
579 | ||
3f7a87d2 FF |
580 | /* Reset init error count upon receipt of INIT-ACK. */ |
581 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); | |
582 | ||
1da177e4 LT |
583 | /* 5.1 C) "A" shall stop the T1-init timer and leave |
584 | * COOKIE-WAIT state. "A" shall then ... start the T1-cookie | |
585 | * timer, and enter the COOKIE-ECHOED state. | |
586 | */ | |
587 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
588 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
589 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
590 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
591 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
592 | SCTP_STATE(SCTP_STATE_COOKIE_ECHOED)); | |
593 | ||
730fc3d0 VY |
594 | /* SCTP-AUTH: genereate the assocition shared keys so that |
595 | * we can potentially signe the COOKIE-ECHO. | |
596 | */ | |
597 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_SHKEY, SCTP_NULL()); | |
598 | ||
1da177e4 LT |
599 | /* 5.1 C) "A" shall then send the State Cookie received in the |
600 | * INIT ACK chunk in a COOKIE ECHO chunk, ... | |
601 | */ | |
602 | /* If there is any errors to report, send the ERROR chunk generated | |
603 | * for unknown parameters as well. | |
604 | */ | |
605 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_COOKIE_ECHO, | |
606 | SCTP_CHUNK(err_chunk)); | |
607 | ||
608 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
609 | } |
610 | ||
59d8d443 XL |
611 | static bool sctp_auth_chunk_verify(struct net *net, struct sctp_chunk *chunk, |
612 | const struct sctp_association *asoc) | |
613 | { | |
614 | struct sctp_chunk auth; | |
615 | ||
616 | if (!chunk->auth_chunk) | |
617 | return true; | |
618 | ||
619 | /* SCTP-AUTH: auth_chunk pointer is only set when the cookie-echo | |
620 | * is supposed to be authenticated and we have to do delayed | |
621 | * authentication. We've just recreated the association using | |
622 | * the information in the cookie and now it's much easier to | |
623 | * do the authentication. | |
624 | */ | |
625 | ||
626 | /* Make sure that we and the peer are AUTH capable */ | |
627 | if (!net->sctp.auth_enable || !asoc->peer.auth_capable) | |
628 | return false; | |
629 | ||
630 | /* set-up our fake chunk so that we can process it */ | |
631 | auth.skb = chunk->auth_chunk; | |
632 | auth.asoc = chunk->asoc; | |
633 | auth.sctp_hdr = chunk->sctp_hdr; | |
634 | auth.chunk_hdr = (struct sctp_chunkhdr *) | |
635 | skb_push(chunk->auth_chunk, | |
636 | sizeof(struct sctp_chunkhdr)); | |
637 | skb_pull(chunk->auth_chunk, sizeof(struct sctp_chunkhdr)); | |
638 | auth.transport = chunk->transport; | |
639 | ||
640 | return sctp_sf_authenticate(asoc, &auth) == SCTP_IERROR_NO_ERROR; | |
641 | } | |
642 | ||
1da177e4 LT |
643 | /* |
644 | * Respond to a normal COOKIE ECHO chunk. | |
645 | * We are the side that is being asked for an association. | |
646 | * | |
647 | * Section: 5.1 Normal Establishment of an Association, D | |
648 | * D) Upon reception of the COOKIE ECHO chunk, Endpoint "Z" will reply | |
649 | * with a COOKIE ACK chunk after building a TCB and moving to | |
650 | * the ESTABLISHED state. A COOKIE ACK chunk may be bundled with | |
651 | * any pending DATA chunks (and/or SACK chunks), but the COOKIE ACK | |
652 | * chunk MUST be the first chunk in the packet. | |
653 | * | |
654 | * IMPLEMENTATION NOTE: An implementation may choose to send the | |
655 | * Communication Up notification to the SCTP user upon reception | |
656 | * of a valid COOKIE ECHO chunk. | |
657 | * | |
658 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
659 | * D) Rules for packet carrying a COOKIE ECHO | |
660 | * | |
661 | * - When sending a COOKIE ECHO, the endpoint MUST use the value of the | |
662 | * Initial Tag received in the INIT ACK. | |
663 | * | |
664 | * - The receiver of a COOKIE ECHO follows the procedures in Section 5. | |
665 | * | |
666 | * Inputs | |
667 | * (endpoint, asoc, chunk) | |
668 | * | |
669 | * Outputs | |
670 | * (asoc, reply_msg, msg_up, timers, counters) | |
671 | * | |
672 | * The return value is the disposition of the chunk. | |
673 | */ | |
172a1599 XL |
674 | enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net, |
675 | const struct sctp_endpoint *ep, | |
676 | const struct sctp_association *asoc, | |
677 | const union sctp_subtype type, | |
678 | void *arg, | |
679 | struct sctp_cmd_seq *commands) | |
1da177e4 | 680 | { |
30f6ebf6 | 681 | struct sctp_ulpevent *ev, *ai_ev = NULL, *auth_ev = NULL; |
1da177e4 | 682 | struct sctp_association *new_asoc; |
01a992be | 683 | struct sctp_init_chunk *peer_init; |
172a1599 | 684 | struct sctp_chunk *chunk = arg; |
1da177e4 | 685 | struct sctp_chunk *err_chk_p; |
172a1599 | 686 | struct sctp_chunk *repl; |
609ee467 | 687 | struct sock *sk; |
172a1599 | 688 | int error = 0; |
1da177e4 LT |
689 | |
690 | /* If the packet is an OOTB packet which is temporarily on the | |
691 | * control endpoint, respond with an ABORT. | |
692 | */ | |
2ce95503 | 693 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 694 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 695 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 696 | } |
1da177e4 LT |
697 | |
698 | /* Make sure that the COOKIE_ECHO chunk has a valid length. | |
699 | * In this case, we check that we have enough for at least a | |
700 | * chunk header. More detailed verification is done | |
701 | * in sctp_unpack_cookie(). | |
702 | */ | |
922dbc5b | 703 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 704 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 705 | |
609ee467 VY |
706 | /* If the endpoint is not listening or if the number of associations |
707 | * on the TCP-style socket exceed the max backlog, respond with an | |
708 | * ABORT. | |
709 | */ | |
710 | sk = ep->base.sk; | |
711 | if (!sctp_sstate(sk, LISTENING) || | |
712 | (sctp_style(sk, TCP) && sk_acceptq_is_full(sk))) | |
24cb81a6 | 713 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
609ee467 | 714 | |
1da177e4 LT |
715 | /* "Decode" the chunk. We have no optional parameters so we |
716 | * are in good shape. | |
717 | */ | |
d808ad9a | 718 | chunk->subh.cookie_hdr = |
1da177e4 | 719 | (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 720 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 721 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 722 | goto nomem; |
1da177e4 LT |
723 | |
724 | /* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint | |
725 | * "Z" will reply with a COOKIE ACK chunk after building a TCB | |
726 | * and moving to the ESTABLISHED state. | |
727 | */ | |
728 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
729 | &err_chk_p); | |
730 | ||
731 | /* FIXME: | |
732 | * If the re-build failed, what is the proper error path | |
733 | * from here? | |
734 | * | |
735 | * [We should abort the association. --piggy] | |
736 | */ | |
737 | if (!new_asoc) { | |
738 | /* FIXME: Several errors are possible. A bad cookie should | |
739 | * be silently discarded, but think about logging it too. | |
740 | */ | |
741 | switch (error) { | |
742 | case -SCTP_IERROR_NOMEM: | |
743 | goto nomem; | |
744 | ||
745 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 746 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 747 | err_chk_p); |
24cb81a6 | 748 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
749 | |
750 | case -SCTP_IERROR_BAD_SIG: | |
751 | default: | |
24cb81a6 | 752 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 753 | } |
1da177e4 LT |
754 | } |
755 | ||
1da177e4 | 756 | |
df7deeb5 VY |
757 | /* Delay state machine commands until later. |
758 | * | |
759 | * Re-build the bind address for the association is done in | |
1da177e4 LT |
760 | * the sctp_unpack_cookie() already. |
761 | */ | |
762 | /* This is a brand-new association, so these are not yet side | |
763 | * effects--it is safe to run them here. | |
764 | */ | |
765 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
766 | ||
de6becdc | 767 | if (!sctp_process_init(new_asoc, chunk, |
6a1e5f33 | 768 | &chunk->subh.cookie_hdr->c.peer_addr, |
1da177e4 LT |
769 | peer_init, GFP_ATOMIC)) |
770 | goto nomem_init; | |
771 | ||
730fc3d0 VY |
772 | /* SCTP-AUTH: Now that we've populate required fields in |
773 | * sctp_process_init, set up the assocaition shared keys as | |
774 | * necessary so that we can potentially authenticate the ACK | |
775 | */ | |
776 | error = sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC); | |
777 | if (error) | |
778 | goto nomem_init; | |
779 | ||
59d8d443 XL |
780 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) { |
781 | sctp_association_free(new_asoc); | |
782 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
bbd0d598 VY |
783 | } |
784 | ||
1da177e4 LT |
785 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
786 | if (!repl) | |
df7deeb5 | 787 | goto nomem_init; |
1da177e4 LT |
788 | |
789 | /* RFC 2960 5.1 Normal Establishment of an Association | |
790 | * | |
791 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
792 | * send the Communication Up notification to the SCTP user | |
793 | * upon reception of a valid COOKIE ECHO chunk. | |
794 | */ | |
795 | ev = sctp_ulpevent_make_assoc_change(new_asoc, 0, SCTP_COMM_UP, 0, | |
796 | new_asoc->c.sinit_num_ostreams, | |
797 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 798 | NULL, GFP_ATOMIC); |
1da177e4 LT |
799 | if (!ev) |
800 | goto nomem_ev; | |
801 | ||
d808ad9a | 802 | /* Sockets API Draft Section 5.3.1.6 |
0f3fffd8 | 803 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 804 | * delivers this notification to inform the application that of the |
0f3fffd8 | 805 | * peers requested adaptation layer. |
1da177e4 | 806 | */ |
0f3fffd8 ISJ |
807 | if (new_asoc->peer.adaptation_ind) { |
808 | ai_ev = sctp_ulpevent_make_adaptation_indication(new_asoc, | |
1da177e4 | 809 | GFP_ATOMIC); |
df7deeb5 VY |
810 | if (!ai_ev) |
811 | goto nomem_aiev; | |
812 | } | |
813 | ||
30f6ebf6 XL |
814 | if (!new_asoc->peer.auth_capable) { |
815 | auth_ev = sctp_ulpevent_make_authkey(new_asoc, 0, | |
816 | SCTP_AUTH_NO_AUTH, | |
817 | GFP_ATOMIC); | |
818 | if (!auth_ev) | |
819 | goto nomem_authev; | |
820 | } | |
821 | ||
df7deeb5 VY |
822 | /* Add all the state machine commands now since we've created |
823 | * everything. This way we don't introduce memory corruptions | |
824 | * during side-effect processing and correclty count established | |
825 | * associations. | |
826 | */ | |
827 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
828 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
829 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
830 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
831 | SCTP_INC_STATS(net, SCTP_MIB_PASSIVEESTABS); | |
df7deeb5 VY |
832 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
833 | ||
9f70f46b | 834 | if (new_asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
df7deeb5 VY |
835 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
836 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
837 | ||
df7deeb5 VY |
838 | /* This will send the COOKIE ACK */ |
839 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
840 | ||
841 | /* Queue the ASSOC_CHANGE event */ | |
842 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
843 | ||
844 | /* Send up the Adaptation Layer Indication event */ | |
845 | if (ai_ev) | |
1da177e4 | 846 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
df7deeb5 | 847 | SCTP_ULPEVENT(ai_ev)); |
1da177e4 | 848 | |
30f6ebf6 XL |
849 | if (auth_ev) |
850 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
851 | SCTP_ULPEVENT(auth_ev)); | |
852 | ||
1da177e4 LT |
853 | return SCTP_DISPOSITION_CONSUME; |
854 | ||
30f6ebf6 XL |
855 | nomem_authev: |
856 | sctp_ulpevent_free(ai_ev); | |
df7deeb5 VY |
857 | nomem_aiev: |
858 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
859 | nomem_ev: |
860 | sctp_chunk_free(repl); | |
1da177e4 LT |
861 | nomem_init: |
862 | sctp_association_free(new_asoc); | |
863 | nomem: | |
864 | return SCTP_DISPOSITION_NOMEM; | |
865 | } | |
866 | ||
867 | /* | |
868 | * Respond to a normal COOKIE ACK chunk. | |
b52effd2 | 869 | * We are the side that is asking for an association. |
1da177e4 LT |
870 | * |
871 | * RFC 2960 5.1 Normal Establishment of an Association | |
872 | * | |
873 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move from the | |
874 | * COOKIE-ECHOED state to the ESTABLISHED state, stopping the T1-cookie | |
875 | * timer. It may also notify its ULP about the successful | |
876 | * establishment of the association with a Communication Up | |
877 | * notification (see Section 10). | |
878 | * | |
879 | * Verification Tag: | |
880 | * Inputs | |
881 | * (endpoint, asoc, chunk) | |
882 | * | |
883 | * Outputs | |
884 | * (asoc, reply_msg, msg_up, timers, counters) | |
885 | * | |
886 | * The return value is the disposition of the chunk. | |
887 | */ | |
172a1599 XL |
888 | enum sctp_disposition sctp_sf_do_5_1E_ca(struct net *net, |
889 | const struct sctp_endpoint *ep, | |
890 | const struct sctp_association *asoc, | |
891 | const union sctp_subtype type, | |
892 | void *arg, | |
893 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
894 | { |
895 | struct sctp_chunk *chunk = arg; | |
896 | struct sctp_ulpevent *ev; | |
897 | ||
898 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 899 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
900 | |
901 | /* Verify that the chunk length for the COOKIE-ACK is OK. | |
902 | * If we don't do this, any bundled chunks may be junked. | |
903 | */ | |
922dbc5b | 904 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 905 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
906 | commands); |
907 | ||
908 | /* Reset init error count upon receipt of COOKIE-ACK, | |
909 | * to avoid problems with the managemement of this | |
910 | * counter in stale cookie situations when a transition back | |
911 | * from the COOKIE-ECHOED state to the COOKIE-WAIT | |
912 | * state is performed. | |
913 | */ | |
3f7a87d2 | 914 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); |
1da177e4 | 915 | |
2277c7cd RH |
916 | /* Set peer label for connection. */ |
917 | security_inet_conn_established(ep->base.sk, chunk->skb); | |
918 | ||
1da177e4 LT |
919 | /* RFC 2960 5.1 Normal Establishment of an Association |
920 | * | |
921 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move | |
922 | * from the COOKIE-ECHOED state to the ESTABLISHED state, | |
923 | * stopping the T1-cookie timer. | |
924 | */ | |
925 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
926 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
927 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
928 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
929 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
930 | SCTP_INC_STATS(net, SCTP_MIB_ACTIVEESTABS); | |
1da177e4 | 931 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
9f70f46b | 932 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
933 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
934 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
1da177e4 LT |
935 | |
936 | /* It may also notify its ULP about the successful | |
937 | * establishment of the association with a Communication Up | |
938 | * notification (see Section 10). | |
939 | */ | |
940 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_UP, | |
941 | 0, asoc->c.sinit_num_ostreams, | |
942 | asoc->c.sinit_max_instreams, | |
a5a35e76 | 943 | NULL, GFP_ATOMIC); |
1da177e4 LT |
944 | |
945 | if (!ev) | |
946 | goto nomem; | |
947 | ||
948 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
949 | ||
950 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 951 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 952 | * delivers this notification to inform the application that of the |
0f3fffd8 | 953 | * peers requested adaptation layer. |
1da177e4 | 954 | */ |
0f3fffd8 ISJ |
955 | if (asoc->peer.adaptation_ind) { |
956 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1da177e4 LT |
957 | if (!ev) |
958 | goto nomem; | |
959 | ||
960 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
961 | SCTP_ULPEVENT(ev)); | |
962 | } | |
963 | ||
30f6ebf6 XL |
964 | if (!asoc->peer.auth_capable) { |
965 | ev = sctp_ulpevent_make_authkey(asoc, 0, SCTP_AUTH_NO_AUTH, | |
966 | GFP_ATOMIC); | |
967 | if (!ev) | |
968 | goto nomem; | |
969 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
970 | SCTP_ULPEVENT(ev)); | |
971 | } | |
972 | ||
1da177e4 LT |
973 | return SCTP_DISPOSITION_CONSUME; |
974 | nomem: | |
975 | return SCTP_DISPOSITION_NOMEM; | |
976 | } | |
977 | ||
978 | /* Generate and sendout a heartbeat packet. */ | |
172a1599 XL |
979 | static enum sctp_disposition sctp_sf_heartbeat( |
980 | const struct sctp_endpoint *ep, | |
981 | const struct sctp_association *asoc, | |
982 | const union sctp_subtype type, | |
983 | void *arg, | |
984 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
985 | { |
986 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
987 | struct sctp_chunk *reply; | |
1da177e4 LT |
988 | |
989 | /* Send a heartbeat to our peer. */ | |
92c73af5 | 990 | reply = sctp_make_heartbeat(asoc, transport); |
1da177e4 LT |
991 | if (!reply) |
992 | return SCTP_DISPOSITION_NOMEM; | |
993 | ||
994 | /* Set rto_pending indicating that an RTT measurement | |
995 | * is started with this heartbeat chunk. | |
996 | */ | |
997 | sctp_add_cmd_sf(commands, SCTP_CMD_RTO_PENDING, | |
998 | SCTP_TRANSPORT(transport)); | |
999 | ||
1000 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1001 | return SCTP_DISPOSITION_CONSUME; | |
1002 | } | |
1003 | ||
1004 | /* Generate a HEARTBEAT packet on the given transport. */ | |
172a1599 XL |
1005 | enum sctp_disposition sctp_sf_sendbeat_8_3(struct net *net, |
1006 | const struct sctp_endpoint *ep, | |
1007 | const struct sctp_association *asoc, | |
1008 | const union sctp_subtype type, | |
1009 | void *arg, | |
1010 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1011 | { |
1012 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
1013 | ||
b9f84786 | 1014 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
1015 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
1016 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
1017 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
1018 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 1019 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
1020 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1021 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
1022 | return SCTP_DISPOSITION_DELETE_TCB; |
1023 | } | |
1024 | ||
1025 | /* Section 3.3.5. | |
1026 | * The Sender-specific Heartbeat Info field should normally include | |
1027 | * information about the sender's current time when this HEARTBEAT | |
1028 | * chunk is sent and the destination transport address to which this | |
1029 | * HEARTBEAT is sent (see Section 8.3). | |
1030 | */ | |
1031 | ||
52ccb8e9 | 1032 | if (transport->param_flags & SPP_HB_ENABLE) { |
1da177e4 LT |
1033 | if (SCTP_DISPOSITION_NOMEM == |
1034 | sctp_sf_heartbeat(ep, asoc, type, arg, | |
1035 | commands)) | |
1036 | return SCTP_DISPOSITION_NOMEM; | |
245cba7e | 1037 | |
1da177e4 LT |
1038 | /* Set transport error counter and association error counter |
1039 | * when sending heartbeat. | |
1040 | */ | |
7e99013a | 1041 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
1da177e4 LT |
1042 | SCTP_TRANSPORT(transport)); |
1043 | } | |
245cba7e VY |
1044 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_IDLE, |
1045 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
1046 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMER_UPDATE, |
1047 | SCTP_TRANSPORT(transport)); | |
1048 | ||
d808ad9a | 1049 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1050 | } |
1051 | ||
7b9438de | 1052 | /* resend asoc strreset_chunk. */ |
172a1599 XL |
1053 | enum sctp_disposition sctp_sf_send_reconf(struct net *net, |
1054 | const struct sctp_endpoint *ep, | |
1055 | const struct sctp_association *asoc, | |
1056 | const union sctp_subtype type, | |
1057 | void *arg, | |
1058 | struct sctp_cmd_seq *commands) | |
7b9438de XL |
1059 | { |
1060 | struct sctp_transport *transport = arg; | |
1061 | ||
1062 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
1063 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
1064 | SCTP_ERROR(ETIMEDOUT)); | |
1065 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
1066 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
1067 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
1068 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
1069 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1070 | return SCTP_DISPOSITION_DELETE_TCB; | |
1071 | } | |
1072 | ||
1073 | sctp_chunk_hold(asoc->strreset_chunk); | |
1074 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1075 | SCTP_CHUNK(asoc->strreset_chunk)); | |
1076 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
1077 | ||
1078 | return SCTP_DISPOSITION_CONSUME; | |
1079 | } | |
1080 | ||
1da177e4 LT |
1081 | /* |
1082 | * Process an heartbeat request. | |
1083 | * | |
1084 | * Section: 8.3 Path Heartbeat | |
1085 | * The receiver of the HEARTBEAT should immediately respond with a | |
1086 | * HEARTBEAT ACK that contains the Heartbeat Information field copied | |
1087 | * from the received HEARTBEAT chunk. | |
1088 | * | |
1089 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1090 | * When receiving an SCTP packet, the endpoint MUST ensure that the | |
1091 | * value in the Verification Tag field of the received SCTP packet | |
1092 | * matches its own Tag. If the received Verification Tag value does not | |
1093 | * match the receiver's own tag value, the receiver shall silently | |
1094 | * discard the packet and shall not process it any further except for | |
1095 | * those cases listed in Section 8.5.1 below. | |
1096 | * | |
1097 | * Inputs | |
1098 | * (endpoint, asoc, chunk) | |
1099 | * | |
1100 | * Outputs | |
1101 | * (asoc, reply_msg, msg_up, timers, counters) | |
1102 | * | |
1103 | * The return value is the disposition of the chunk. | |
1104 | */ | |
172a1599 XL |
1105 | enum sctp_disposition sctp_sf_beat_8_3(struct net *net, |
1106 | const struct sctp_endpoint *ep, | |
1107 | const struct sctp_association *asoc, | |
1108 | const union sctp_subtype type, | |
1109 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 1110 | { |
3c918704 | 1111 | struct sctp_paramhdr *param_hdr; |
1da177e4 LT |
1112 | struct sctp_chunk *chunk = arg; |
1113 | struct sctp_chunk *reply; | |
1114 | size_t paylen = 0; | |
1115 | ||
1116 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1117 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1118 | |
1119 | /* Make sure that the HEARTBEAT chunk has a valid length. */ | |
38c00f74 XL |
1120 | if (!sctp_chunk_length_valid(chunk, |
1121 | sizeof(struct sctp_heartbeat_chunk))) | |
24cb81a6 | 1122 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1123 | commands); |
1124 | ||
1125 | /* 8.3 The receiver of the HEARTBEAT should immediately | |
1126 | * respond with a HEARTBEAT ACK that contains the Heartbeat | |
1127 | * Information field copied from the received HEARTBEAT chunk. | |
1128 | */ | |
4d2dcdf4 | 1129 | chunk->subh.hb_hdr = (struct sctp_heartbeathdr *)chunk->skb->data; |
3c918704 | 1130 | param_hdr = (struct sctp_paramhdr *)chunk->subh.hb_hdr; |
922dbc5b | 1131 | paylen = ntohs(chunk->chunk_hdr->length) - sizeof(struct sctp_chunkhdr); |
06a31e2b TG |
1132 | |
1133 | if (ntohs(param_hdr->length) > paylen) | |
1134 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
1135 | param_hdr, commands); | |
1136 | ||
62b08083 SS |
1137 | if (!pskb_pull(chunk->skb, paylen)) |
1138 | goto nomem; | |
1da177e4 | 1139 | |
06a31e2b | 1140 | reply = sctp_make_heartbeat_ack(asoc, chunk, param_hdr, paylen); |
1da177e4 LT |
1141 | if (!reply) |
1142 | goto nomem; | |
1143 | ||
1144 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1145 | return SCTP_DISPOSITION_CONSUME; | |
1146 | ||
1147 | nomem: | |
1148 | return SCTP_DISPOSITION_NOMEM; | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Process the returning HEARTBEAT ACK. | |
1153 | * | |
1154 | * Section: 8.3 Path Heartbeat | |
1155 | * Upon the receipt of the HEARTBEAT ACK, the sender of the HEARTBEAT | |
1156 | * should clear the error counter of the destination transport | |
1157 | * address to which the HEARTBEAT was sent, and mark the destination | |
1158 | * transport address as active if it is not so marked. The endpoint may | |
1159 | * optionally report to the upper layer when an inactive destination | |
1160 | * address is marked as active due to the reception of the latest | |
1161 | * HEARTBEAT ACK. The receiver of the HEARTBEAT ACK must also | |
1162 | * clear the association overall error count as well (as defined | |
1163 | * in section 8.1). | |
1164 | * | |
1165 | * The receiver of the HEARTBEAT ACK should also perform an RTT | |
1166 | * measurement for that destination transport address using the time | |
1167 | * value carried in the HEARTBEAT ACK chunk. | |
1168 | * | |
1169 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1170 | * | |
1171 | * Inputs | |
1172 | * (endpoint, asoc, chunk) | |
1173 | * | |
1174 | * Outputs | |
1175 | * (asoc, reply_msg, msg_up, timers, counters) | |
1176 | * | |
1177 | * The return value is the disposition of the chunk. | |
1178 | */ | |
172a1599 XL |
1179 | enum sctp_disposition sctp_sf_backbeat_8_3(struct net *net, |
1180 | const struct sctp_endpoint *ep, | |
1181 | const struct sctp_association *asoc, | |
1182 | const union sctp_subtype type, | |
1183 | void *arg, | |
1184 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1185 | { |
edf903f8 | 1186 | struct sctp_sender_hb_info *hbinfo; |
1da177e4 | 1187 | struct sctp_chunk *chunk = arg; |
1da177e4 | 1188 | struct sctp_transport *link; |
1da177e4 | 1189 | unsigned long max_interval; |
edf903f8 | 1190 | union sctp_addr from_addr; |
1da177e4 LT |
1191 | |
1192 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1193 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1194 | |
1195 | /* Make sure that the HEARTBEAT-ACK chunk has a valid length. */ | |
922dbc5b | 1196 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr) + |
edf903f8 | 1197 | sizeof(*hbinfo))) |
24cb81a6 | 1198 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1199 | commands); |
1200 | ||
edf903f8 | 1201 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
a601266e | 1202 | /* Make sure that the length of the parameter is what we expect */ |
edf903f8 | 1203 | if (ntohs(hbinfo->param_hdr.length) != sizeof(*hbinfo)) |
a601266e | 1204 | return SCTP_DISPOSITION_DISCARD; |
a601266e | 1205 | |
1da177e4 | 1206 | from_addr = hbinfo->daddr; |
63de08f4 | 1207 | link = sctp_assoc_lookup_paddr(asoc, &from_addr); |
1da177e4 LT |
1208 | |
1209 | /* This should never happen, but lets log it if so. */ | |
3f7a87d2 FF |
1210 | if (unlikely(!link)) { |
1211 | if (from_addr.sa.sa_family == AF_INET6) { | |
e87cc472 JP |
1212 | net_warn_ratelimited("%s association %p could not find address %pI6\n", |
1213 | __func__, | |
1214 | asoc, | |
1215 | &from_addr.v6.sin6_addr); | |
3f7a87d2 | 1216 | } else { |
e87cc472 JP |
1217 | net_warn_ratelimited("%s association %p could not find address %pI4\n", |
1218 | __func__, | |
1219 | asoc, | |
1220 | &from_addr.v4.sin_addr.s_addr); | |
3f7a87d2 | 1221 | } |
1da177e4 LT |
1222 | return SCTP_DISPOSITION_DISCARD; |
1223 | } | |
1224 | ||
ad8fec17 SS |
1225 | /* Validate the 64-bit random nonce. */ |
1226 | if (hbinfo->hb_nonce != link->hb_nonce) | |
1227 | return SCTP_DISPOSITION_DISCARD; | |
1228 | ||
52ccb8e9 | 1229 | max_interval = link->hbinterval + link->rto; |
1da177e4 LT |
1230 | |
1231 | /* Check if the timestamp looks valid. */ | |
1232 | if (time_after(hbinfo->sent_at, jiffies) || | |
1233 | time_after(jiffies, hbinfo->sent_at + max_interval)) { | |
bb33381d DB |
1234 | pr_debug("%s: HEARTBEAT ACK with invalid timestamp received " |
1235 | "for transport:%p\n", __func__, link); | |
1236 | ||
1da177e4 LT |
1237 | return SCTP_DISPOSITION_DISCARD; |
1238 | } | |
1239 | ||
1240 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of | |
1241 | * the HEARTBEAT should clear the error counter of the | |
1242 | * destination transport address to which the HEARTBEAT was | |
1243 | * sent and mark the destination transport address as active if | |
1244 | * it is not so marked. | |
1245 | */ | |
1246 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_ON, SCTP_TRANSPORT(link)); | |
1247 | ||
1248 | return SCTP_DISPOSITION_CONSUME; | |
1249 | } | |
1250 | ||
1251 | /* Helper function to send out an abort for the restart | |
1252 | * condition. | |
1253 | */ | |
2ce95503 | 1254 | static int sctp_sf_send_restart_abort(struct net *net, union sctp_addr *ssa, |
1da177e4 | 1255 | struct sctp_chunk *init, |
a85bbeb2 | 1256 | struct sctp_cmd_seq *commands) |
1da177e4 | 1257 | { |
172a1599 | 1258 | struct sctp_af *af = sctp_get_af_specific(ssa->v4.sin_family); |
1da177e4 LT |
1259 | union sctp_addr_param *addrparm; |
1260 | struct sctp_errhdr *errhdr; | |
d8238d9d | 1261 | char buffer[sizeof(*errhdr) + sizeof(*addrparm)]; |
172a1599 XL |
1262 | struct sctp_endpoint *ep; |
1263 | struct sctp_packet *pkt; | |
1264 | int len; | |
1da177e4 LT |
1265 | |
1266 | /* Build the error on the stack. We are way to malloc crazy | |
1267 | * throughout the code today. | |
1268 | */ | |
1269 | errhdr = (struct sctp_errhdr *)buffer; | |
1270 | addrparm = (union sctp_addr_param *)errhdr->variable; | |
1271 | ||
1272 | /* Copy into a parm format. */ | |
1273 | len = af->to_addr_param(ssa, addrparm); | |
d8238d9d | 1274 | len += sizeof(*errhdr); |
1da177e4 LT |
1275 | |
1276 | errhdr->cause = SCTP_ERROR_RESTART; | |
1277 | errhdr->length = htons(len); | |
1278 | ||
1279 | /* Assign to the control socket. */ | |
2ce95503 | 1280 | ep = sctp_sk(net->sctp.ctl_sock)->ep; |
1da177e4 LT |
1281 | |
1282 | /* Association is NULL since this may be a restart attack and we | |
1283 | * want to send back the attacker's vtag. | |
1284 | */ | |
24cb81a6 | 1285 | pkt = sctp_abort_pkt_new(net, ep, NULL, init, errhdr, len); |
1da177e4 LT |
1286 | |
1287 | if (!pkt) | |
1288 | goto out; | |
1289 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(pkt)); | |
1290 | ||
b01a2407 | 1291 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1292 | |
1293 | /* Discard the rest of the inbound packet. */ | |
1294 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); | |
1295 | ||
1296 | out: | |
1297 | /* Even if there is no memory, treat as a failure so | |
1298 | * the packet will get dropped. | |
1299 | */ | |
1300 | return 0; | |
1301 | } | |
1302 | ||
123031c0 JP |
1303 | static bool list_has_sctp_addr(const struct list_head *list, |
1304 | union sctp_addr *ipaddr) | |
1305 | { | |
1306 | struct sctp_transport *addr; | |
1307 | ||
1308 | list_for_each_entry(addr, list, transports) { | |
1309 | if (sctp_cmp_addr_exact(ipaddr, &addr->ipaddr)) | |
1310 | return true; | |
1311 | } | |
1312 | ||
1313 | return false; | |
1314 | } | |
1da177e4 LT |
1315 | /* A restart is occurring, check to make sure no new addresses |
1316 | * are being added as we may be under a takeover attack. | |
1317 | */ | |
1318 | static int sctp_sf_check_restart_addrs(const struct sctp_association *new_asoc, | |
1319 | const struct sctp_association *asoc, | |
1320 | struct sctp_chunk *init, | |
a85bbeb2 | 1321 | struct sctp_cmd_seq *commands) |
1da177e4 | 1322 | { |
2ce95503 | 1323 | struct net *net = sock_net(new_asoc->base.sk); |
123031c0 JP |
1324 | struct sctp_transport *new_addr; |
1325 | int ret = 1; | |
1da177e4 | 1326 | |
123031c0 | 1327 | /* Implementor's Guide - Section 5.2.2 |
1da177e4 LT |
1328 | * ... |
1329 | * Before responding the endpoint MUST check to see if the | |
1330 | * unexpected INIT adds new addresses to the association. If new | |
1331 | * addresses are added to the association, the endpoint MUST respond | |
1332 | * with an ABORT.. | |
1333 | */ | |
1334 | ||
1335 | /* Search through all current addresses and make sure | |
1336 | * we aren't adding any new ones. | |
1337 | */ | |
9dbc15f0 | 1338 | list_for_each_entry(new_addr, &new_asoc->peer.transport_addr_list, |
123031c0 JP |
1339 | transports) { |
1340 | if (!list_has_sctp_addr(&asoc->peer.transport_addr_list, | |
1341 | &new_addr->ipaddr)) { | |
2ce95503 | 1342 | sctp_sf_send_restart_abort(net, &new_addr->ipaddr, init, |
123031c0 JP |
1343 | commands); |
1344 | ret = 0; | |
1da177e4 | 1345 | break; |
123031c0 | 1346 | } |
1da177e4 LT |
1347 | } |
1348 | ||
1349 | /* Return success if all addresses were found. */ | |
123031c0 | 1350 | return ret; |
1da177e4 LT |
1351 | } |
1352 | ||
1353 | /* Populate the verification/tie tags based on overlapping INIT | |
1354 | * scenario. | |
1355 | * | |
1356 | * Note: Do not use in CLOSED or SHUTDOWN-ACK-SENT state. | |
1357 | */ | |
1358 | static void sctp_tietags_populate(struct sctp_association *new_asoc, | |
1359 | const struct sctp_association *asoc) | |
1360 | { | |
1361 | switch (asoc->state) { | |
1362 | ||
1363 | /* 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State */ | |
1364 | ||
1365 | case SCTP_STATE_COOKIE_WAIT: | |
1366 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1367 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1368 | new_asoc->c.peer_ttag = 0; | |
1369 | break; | |
1370 | ||
1371 | case SCTP_STATE_COOKIE_ECHOED: | |
1372 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1373 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1374 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1375 | break; | |
1376 | ||
1377 | /* 5.2.2 Unexpected INIT in States Other than CLOSED, COOKIE-ECHOED, | |
1378 | * COOKIE-WAIT and SHUTDOWN-ACK-SENT | |
1379 | */ | |
1380 | default: | |
1381 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1382 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1383 | break; | |
3ff50b79 | 1384 | } |
1da177e4 LT |
1385 | |
1386 | /* Other parameters for the endpoint SHOULD be copied from the | |
1387 | * existing parameters of the association (e.g. number of | |
1388 | * outbound streams) into the INIT ACK and cookie. | |
1389 | */ | |
1390 | new_asoc->rwnd = asoc->rwnd; | |
1391 | new_asoc->c.sinit_num_ostreams = asoc->c.sinit_num_ostreams; | |
1392 | new_asoc->c.sinit_max_instreams = asoc->c.sinit_max_instreams; | |
1393 | new_asoc->c.initial_tsn = asoc->c.initial_tsn; | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * Compare vtag/tietag values to determine unexpected COOKIE-ECHO | |
1398 | * handling action. | |
1399 | * | |
1400 | * RFC 2960 5.2.4 Handle a COOKIE ECHO when a TCB exists. | |
1401 | * | |
1402 | * Returns value representing action to be taken. These action values | |
1403 | * correspond to Action/Description values in RFC 2960, Table 2. | |
1404 | */ | |
1405 | static char sctp_tietags_compare(struct sctp_association *new_asoc, | |
1406 | const struct sctp_association *asoc) | |
1407 | { | |
1408 | /* In this case, the peer may have restarted. */ | |
1409 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1410 | (asoc->c.peer_vtag != new_asoc->c.peer_vtag) && | |
1411 | (asoc->c.my_vtag == new_asoc->c.my_ttag) && | |
1412 | (asoc->c.peer_vtag == new_asoc->c.peer_ttag)) | |
1413 | return 'A'; | |
1414 | ||
1415 | /* Collision case B. */ | |
1416 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1417 | ((asoc->c.peer_vtag != new_asoc->c.peer_vtag) || | |
1418 | (0 == asoc->c.peer_vtag))) { | |
1419 | return 'B'; | |
1420 | } | |
1421 | ||
1422 | /* Collision case D. */ | |
1423 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1424 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag)) | |
1425 | return 'D'; | |
1426 | ||
1427 | /* Collision case C. */ | |
1428 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1429 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag) && | |
1430 | (0 == new_asoc->c.my_ttag) && | |
1431 | (0 == new_asoc->c.peer_ttag)) | |
1432 | return 'C'; | |
1433 | ||
1434 | /* No match to any of the special cases; discard this packet. */ | |
1435 | return 'E'; | |
1436 | } | |
1437 | ||
1438 | /* Common helper routine for both duplicate and simulataneous INIT | |
1439 | * chunk handling. | |
1440 | */ | |
172a1599 XL |
1441 | static enum sctp_disposition sctp_sf_do_unexpected_init( |
1442 | struct net *net, | |
1443 | const struct sctp_endpoint *ep, | |
1444 | const struct sctp_association *asoc, | |
1445 | const union sctp_subtype type, | |
1446 | void *arg, | |
1447 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1448 | { |
62e6b7e4 XL |
1449 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
1450 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 1451 | struct sctp_association *new_asoc; |
172a1599 | 1452 | enum sctp_disposition retval; |
1da177e4 | 1453 | struct sctp_packet *packet; |
1da177e4 LT |
1454 | int len; |
1455 | ||
2277c7cd RH |
1456 | /* Update socket peer label if first association. */ |
1457 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
1458 | chunk->skb)) | |
1459 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1460 | ||
1da177e4 LT |
1461 | /* 6.10 Bundling |
1462 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
1463 | * SHUTDOWN COMPLETE with any other chunks. | |
1464 | * | |
1465 | * IG Section 2.11.2 | |
1466 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
1467 | * enforce these rules by silently discarding an arriving packet | |
1468 | * with an INIT chunk that is bundled with other chunks. | |
1469 | */ | |
1470 | if (!chunk->singleton) | |
24cb81a6 | 1471 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1472 | |
1473 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification | |
d808ad9a | 1474 | * Tag. |
1da177e4 LT |
1475 | */ |
1476 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 1477 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1478 | |
1479 | /* Make sure that the INIT chunk has a valid length. | |
1480 | * In this case, we generate a protocol violation since we have | |
1481 | * an association established. | |
1482 | */ | |
01a992be | 1483 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 1484 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1485 | commands); |
1486 | /* Grab the INIT header. */ | |
4ae70c08 | 1487 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
1488 | |
1489 | /* Tag the variable length parameters. */ | |
4ae70c08 | 1490 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
1491 | |
1492 | /* Verify the INIT chunk before processing it. */ | |
1493 | err_chunk = NULL; | |
b14878cc | 1494 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 1495 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
1496 | &err_chunk)) { |
1497 | /* This chunk contains fatal error. It is to be discarded. | |
1498 | * Send an ABORT, with causes if there is any. | |
1499 | */ | |
1500 | if (err_chunk) { | |
24cb81a6 | 1501 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 1502 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1503 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 1504 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 1505 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1506 | |
1507 | if (packet) { | |
1508 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
1509 | SCTP_PACKET(packet)); | |
24cb81a6 | 1510 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1511 | retval = SCTP_DISPOSITION_CONSUME; |
1512 | } else { | |
1513 | retval = SCTP_DISPOSITION_NOMEM; | |
1514 | } | |
1515 | goto cleanup; | |
1516 | } else { | |
24cb81a6 | 1517 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
1518 | commands); |
1519 | } | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * Other parameters for the endpoint SHOULD be copied from the | |
1524 | * existing parameters of the association (e.g. number of | |
1525 | * outbound streams) into the INIT ACK and cookie. | |
1526 | * FIXME: We are copying parameters from the endpoint not the | |
1527 | * association. | |
1528 | */ | |
1529 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
1530 | if (!new_asoc) | |
1531 | goto nomem; | |
1532 | ||
409b95af VY |
1533 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
1534 | sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0) | |
1535 | goto nomem; | |
1536 | ||
1da177e4 LT |
1537 | /* In the outbound INIT ACK the endpoint MUST copy its current |
1538 | * Verification Tag and Peers Verification tag into a reserved | |
1539 | * place (local tie-tag and per tie-tag) within the state cookie. | |
1540 | */ | |
de6becdc | 1541 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 1542 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
df7deeb5 VY |
1543 | GFP_ATOMIC)) |
1544 | goto nomem; | |
1da177e4 LT |
1545 | |
1546 | /* Make sure no new addresses are being added during the | |
1547 | * restart. Do not do this check for COOKIE-WAIT state, | |
1548 | * since there are no peer addresses to check against. | |
1549 | * Upon return an ABORT will have been sent if needed. | |
1550 | */ | |
1551 | if (!sctp_state(asoc, COOKIE_WAIT)) { | |
1552 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, | |
1553 | commands)) { | |
1554 | retval = SCTP_DISPOSITION_CONSUME; | |
df7deeb5 | 1555 | goto nomem_retval; |
1da177e4 LT |
1556 | } |
1557 | } | |
1558 | ||
1559 | sctp_tietags_populate(new_asoc, asoc); | |
1560 | ||
1561 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ | |
1562 | ||
1563 | /* If there are errors need to be reported for unknown parameters, | |
1564 | * make sure to reserve enough room in the INIT ACK for them. | |
1565 | */ | |
1566 | len = 0; | |
1567 | if (err_chunk) { | |
1568 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 1569 | sizeof(struct sctp_chunkhdr); |
1da177e4 LT |
1570 | } |
1571 | ||
1da177e4 LT |
1572 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
1573 | if (!repl) | |
1574 | goto nomem; | |
1575 | ||
1576 | /* If there are errors need to be reported for unknown parameters, | |
1577 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
1578 | * parameter. | |
1579 | */ | |
1580 | if (err_chunk) { | |
1581 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
1582 | * ERROR chunk generated by sctp_verify_init(). Since the | |
1583 | * error cause code for "unknown parameter" and the | |
1584 | * "Unrecognized parameter" type is the same, we can | |
1585 | * construct the parameters in INIT ACK by copying the | |
1586 | * ERROR causes over. | |
1587 | */ | |
62e6b7e4 | 1588 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 1589 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1590 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1591 | /* Replace the cause code with the "Unrecognized parameter" |
1592 | * parameter type. | |
1593 | */ | |
1594 | sctp_addto_chunk(repl, len, unk_param); | |
1595 | } | |
1596 | ||
1597 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
1598 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1599 | ||
1600 | /* | |
1601 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
1602 | * "Z" MUST NOT allocate any resources for this new association. | |
1603 | * Otherwise, "Z" will be vulnerable to resource attacks. | |
1604 | */ | |
1605 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
1606 | retval = SCTP_DISPOSITION_CONSUME; | |
1607 | ||
df7deeb5 VY |
1608 | return retval; |
1609 | ||
1610 | nomem: | |
1611 | retval = SCTP_DISPOSITION_NOMEM; | |
1612 | nomem_retval: | |
1613 | if (new_asoc) | |
1614 | sctp_association_free(new_asoc); | |
1da177e4 LT |
1615 | cleanup: |
1616 | if (err_chunk) | |
1617 | sctp_chunk_free(err_chunk); | |
1618 | return retval; | |
1da177e4 LT |
1619 | } |
1620 | ||
1621 | /* | |
25985edc | 1622 | * Handle simultaneous INIT. |
1da177e4 LT |
1623 | * This means we started an INIT and then we got an INIT request from |
1624 | * our peer. | |
1625 | * | |
1626 | * Section: 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State (Item B) | |
1627 | * This usually indicates an initialization collision, i.e., each | |
1628 | * endpoint is attempting, at about the same time, to establish an | |
1629 | * association with the other endpoint. | |
1630 | * | |
1631 | * Upon receipt of an INIT in the COOKIE-WAIT or COOKIE-ECHOED state, an | |
1632 | * endpoint MUST respond with an INIT ACK using the same parameters it | |
1633 | * sent in its original INIT chunk (including its Verification Tag, | |
1634 | * unchanged). These original parameters are combined with those from the | |
1635 | * newly received INIT chunk. The endpoint shall also generate a State | |
1636 | * Cookie with the INIT ACK. The endpoint uses the parameters sent in its | |
1637 | * INIT to calculate the State Cookie. | |
1638 | * | |
1639 | * After that, the endpoint MUST NOT change its state, the T1-init | |
1640 | * timer shall be left running and the corresponding TCB MUST NOT be | |
1641 | * destroyed. The normal procedures for handling State Cookies when | |
1642 | * a TCB exists will resolve the duplicate INITs to a single association. | |
1643 | * | |
1644 | * For an endpoint that is in the COOKIE-ECHOED state it MUST populate | |
1645 | * its Tie-Tags with the Tag information of itself and its peer (see | |
1646 | * section 5.2.2 for a description of the Tie-Tags). | |
1647 | * | |
1648 | * Verification Tag: Not explicit, but an INIT can not have a valid | |
1649 | * verification tag, so we skip the check. | |
1650 | * | |
1651 | * Inputs | |
1652 | * (endpoint, asoc, chunk) | |
1653 | * | |
1654 | * Outputs | |
1655 | * (asoc, reply_msg, msg_up, timers, counters) | |
1656 | * | |
1657 | * The return value is the disposition of the chunk. | |
1658 | */ | |
172a1599 XL |
1659 | enum sctp_disposition sctp_sf_do_5_2_1_siminit( |
1660 | struct net *net, | |
1661 | const struct sctp_endpoint *ep, | |
1662 | const struct sctp_association *asoc, | |
1663 | const union sctp_subtype type, | |
1664 | void *arg, | |
1665 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1666 | { |
1667 | /* Call helper to do the real work for both simulataneous and | |
1668 | * duplicate INIT chunk handling. | |
1669 | */ | |
24cb81a6 | 1670 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1671 | } |
1672 | ||
1673 | /* | |
1674 | * Handle duplicated INIT messages. These are usually delayed | |
1675 | * restransmissions. | |
1676 | * | |
1677 | * Section: 5.2.2 Unexpected INIT in States Other than CLOSED, | |
1678 | * COOKIE-ECHOED and COOKIE-WAIT | |
1679 | * | |
1680 | * Unless otherwise stated, upon reception of an unexpected INIT for | |
1681 | * this association, the endpoint shall generate an INIT ACK with a | |
1682 | * State Cookie. In the outbound INIT ACK the endpoint MUST copy its | |
1683 | * current Verification Tag and peer's Verification Tag into a reserved | |
1684 | * place within the state cookie. We shall refer to these locations as | |
1685 | * the Peer's-Tie-Tag and the Local-Tie-Tag. The outbound SCTP packet | |
1686 | * containing this INIT ACK MUST carry a Verification Tag value equal to | |
1687 | * the Initiation Tag found in the unexpected INIT. And the INIT ACK | |
1688 | * MUST contain a new Initiation Tag (randomly generated see Section | |
1689 | * 5.3.1). Other parameters for the endpoint SHOULD be copied from the | |
1690 | * existing parameters of the association (e.g. number of outbound | |
1691 | * streams) into the INIT ACK and cookie. | |
1692 | * | |
1693 | * After sending out the INIT ACK, the endpoint shall take no further | |
1694 | * actions, i.e., the existing association, including its current state, | |
1695 | * and the corresponding TCB MUST NOT be changed. | |
1696 | * | |
1697 | * Note: Only when a TCB exists and the association is not in a COOKIE- | |
1698 | * WAIT state are the Tie-Tags populated. For a normal association INIT | |
1699 | * (i.e. the endpoint is in a COOKIE-WAIT state), the Tie-Tags MUST be | |
1700 | * set to 0 (indicating that no previous TCB existed). The INIT ACK and | |
1701 | * State Cookie are populated as specified in section 5.2.1. | |
1702 | * | |
1703 | * Verification Tag: Not specified, but an INIT has no way of knowing | |
1704 | * what the verification tag could be, so we ignore it. | |
1705 | * | |
1706 | * Inputs | |
1707 | * (endpoint, asoc, chunk) | |
1708 | * | |
1709 | * Outputs | |
1710 | * (asoc, reply_msg, msg_up, timers, counters) | |
1711 | * | |
1712 | * The return value is the disposition of the chunk. | |
1713 | */ | |
172a1599 XL |
1714 | enum sctp_disposition sctp_sf_do_5_2_2_dupinit( |
1715 | struct net *net, | |
24cb81a6 | 1716 | const struct sctp_endpoint *ep, |
1da177e4 | 1717 | const struct sctp_association *asoc, |
bfc6f827 | 1718 | const union sctp_subtype type, |
1da177e4 | 1719 | void *arg, |
a85bbeb2 | 1720 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
1721 | { |
1722 | /* Call helper to do the real work for both simulataneous and | |
1723 | * duplicate INIT chunk handling. | |
1724 | */ | |
24cb81a6 | 1725 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1726 | } |
1727 | ||
1728 | ||
610ab73a VY |
1729 | /* |
1730 | * Unexpected INIT-ACK handler. | |
1731 | * | |
1732 | * Section 5.2.3 | |
1733 | * If an INIT ACK received by an endpoint in any state other than the | |
1734 | * COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk. | |
1735 | * An unexpected INIT ACK usually indicates the processing of an old or | |
1736 | * duplicated INIT chunk. | |
1737 | */ | |
172a1599 XL |
1738 | enum sctp_disposition sctp_sf_do_5_2_3_initack( |
1739 | struct net *net, | |
1740 | const struct sctp_endpoint *ep, | |
1741 | const struct sctp_association *asoc, | |
1742 | const union sctp_subtype type, | |
1743 | void *arg, | |
1744 | struct sctp_cmd_seq *commands) | |
610ab73a VY |
1745 | { |
1746 | /* Per the above section, we'll discard the chunk if we have an | |
1747 | * endpoint. If this is an OOTB INIT-ACK, treat it as such. | |
1748 | */ | |
2ce95503 | 1749 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) |
24cb81a6 | 1750 | return sctp_sf_ootb(net, ep, asoc, type, arg, commands); |
610ab73a | 1751 | else |
24cb81a6 | 1752 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
610ab73a | 1753 | } |
1da177e4 LT |
1754 | |
1755 | /* Unexpected COOKIE-ECHO handler for peer restart (Table 2, action 'A') | |
1756 | * | |
1757 | * Section 5.2.4 | |
1758 | * A) In this case, the peer may have restarted. | |
1759 | */ | |
172a1599 XL |
1760 | static enum sctp_disposition sctp_sf_do_dupcook_a( |
1761 | struct net *net, | |
24cb81a6 | 1762 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1763 | const struct sctp_association *asoc, |
1764 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1765 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1766 | struct sctp_association *new_asoc) |
1767 | { | |
01a992be | 1768 | struct sctp_init_chunk *peer_init; |
172a1599 | 1769 | enum sctp_disposition disposition; |
1da177e4 LT |
1770 | struct sctp_ulpevent *ev; |
1771 | struct sctp_chunk *repl; | |
1772 | struct sctp_chunk *err; | |
1da177e4 LT |
1773 | |
1774 | /* new_asoc is a brand-new association, so these are not yet | |
1775 | * side effects--it is safe to run them here. | |
1776 | */ | |
1777 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
1778 | ||
de6becdc | 1779 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1780 | GFP_ATOMIC)) |
1781 | goto nomem; | |
1782 | ||
4842a08f XL |
1783 | if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC)) |
1784 | goto nomem; | |
1785 | ||
59d8d443 XL |
1786 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) |
1787 | return SCTP_DISPOSITION_DISCARD; | |
1788 | ||
1da177e4 LT |
1789 | /* Make sure no new addresses are being added during the |
1790 | * restart. Though this is a pretty complicated attack | |
1791 | * since you'd have to get inside the cookie. | |
1792 | */ | |
59d8d443 | 1793 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, commands)) |
1da177e4 | 1794 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1795 | |
1796 | /* If the endpoint is in the SHUTDOWN-ACK-SENT state and recognizes | |
1797 | * the peer has restarted (Action A), it MUST NOT setup a new | |
1798 | * association but instead resend the SHUTDOWN ACK and send an ERROR | |
1799 | * chunk with a "Cookie Received while Shutting Down" error cause to | |
1800 | * its peer. | |
1801 | */ | |
1802 | if (sctp_state(asoc, SHUTDOWN_ACK_SENT)) { | |
24cb81a6 | 1803 | disposition = sctp_sf_do_9_2_reshutack(net, ep, asoc, |
1da177e4 LT |
1804 | SCTP_ST_CHUNK(chunk->chunk_hdr->type), |
1805 | chunk, commands); | |
1806 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
1807 | goto nomem; | |
1808 | ||
1809 | err = sctp_make_op_error(asoc, chunk, | |
1810 | SCTP_ERROR_COOKIE_IN_SHUTDOWN, | |
6383cfb3 | 1811 | NULL, 0, 0); |
1da177e4 LT |
1812 | if (err) |
1813 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1814 | SCTP_CHUNK(err)); | |
1815 | ||
1816 | return SCTP_DISPOSITION_CONSUME; | |
1817 | } | |
1818 | ||
a000c01e WY |
1819 | /* For now, stop pending T3-rtx and SACK timers, fail any unsent/unacked |
1820 | * data. Consider the optional choice of resending of this data. | |
1da177e4 | 1821 | */ |
a000c01e WY |
1822 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); |
1823 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1824 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 LT |
1825 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_OUTQUEUE, SCTP_NULL()); |
1826 | ||
a000c01e WY |
1827 | /* Stop pending T4-rto timer, teardown ASCONF queue, ASCONF-ACK queue |
1828 | * and ASCONF-ACK cache. | |
1829 | */ | |
1830 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1831 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
1832 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_ASCONF_QUEUE, SCTP_NULL()); | |
1833 | ||
1da177e4 LT |
1834 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
1835 | if (!repl) | |
1836 | goto nomem; | |
1837 | ||
1da177e4 LT |
1838 | /* Report association restart to upper layer. */ |
1839 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_RESTART, 0, | |
1840 | new_asoc->c.sinit_num_ostreams, | |
1841 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 1842 | NULL, GFP_ATOMIC); |
1da177e4 LT |
1843 | if (!ev) |
1844 | goto nomem_ev; | |
1845 | ||
df7deeb5 VY |
1846 | /* Update the content of current association. */ |
1847 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); | |
1da177e4 | 1848 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
bdf6fa52 VY |
1849 | if (sctp_state(asoc, SHUTDOWN_PENDING) && |
1850 | (sctp_sstate(asoc->base.sk, CLOSING) || | |
1851 | sock_flag(asoc->base.sk, SOCK_DEAD))) { | |
1852 | /* if were currently in SHUTDOWN_PENDING, but the socket | |
1853 | * has been closed by user, don't transition to ESTABLISHED. | |
1854 | * Instead trigger SHUTDOWN bundled with COOKIE_ACK. | |
1855 | */ | |
1856 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1857 | return sctp_sf_do_9_2_start_shutdown(net, ep, asoc, | |
1858 | SCTP_ST_CHUNK(0), NULL, | |
1859 | commands); | |
1860 | } else { | |
1861 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1862 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
1863 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1864 | } | |
1da177e4 LT |
1865 | return SCTP_DISPOSITION_CONSUME; |
1866 | ||
1867 | nomem_ev: | |
1868 | sctp_chunk_free(repl); | |
1869 | nomem: | |
1870 | return SCTP_DISPOSITION_NOMEM; | |
1871 | } | |
1872 | ||
1873 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'B') | |
1874 | * | |
1875 | * Section 5.2.4 | |
1876 | * B) In this case, both sides may be attempting to start an association | |
1877 | * at about the same time but the peer endpoint started its INIT | |
1878 | * after responding to the local endpoint's INIT | |
1879 | */ | |
1880 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1881 | static enum sctp_disposition sctp_sf_do_dupcook_b( |
1882 | struct net *net, | |
24cb81a6 | 1883 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1884 | const struct sctp_association *asoc, |
1885 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1886 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1887 | struct sctp_association *new_asoc) |
1888 | { | |
01a992be | 1889 | struct sctp_init_chunk *peer_init; |
1da177e4 LT |
1890 | struct sctp_chunk *repl; |
1891 | ||
1892 | /* new_asoc is a brand-new association, so these are not yet | |
1893 | * side effects--it is safe to run them here. | |
1894 | */ | |
1895 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
de6becdc | 1896 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1897 | GFP_ATOMIC)) |
1898 | goto nomem; | |
1899 | ||
4842a08f XL |
1900 | if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC)) |
1901 | goto nomem; | |
1902 | ||
59d8d443 XL |
1903 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) |
1904 | return SCTP_DISPOSITION_DISCARD; | |
1905 | ||
1da177e4 LT |
1906 | /* Update the content of current association. */ |
1907 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); | |
1908 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1909 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 1910 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
1911 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
1912 | ||
1913 | repl = sctp_make_cookie_ack(new_asoc, chunk); | |
1914 | if (!repl) | |
1915 | goto nomem; | |
1916 | ||
1917 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1da177e4 LT |
1918 | |
1919 | /* RFC 2960 5.1 Normal Establishment of an Association | |
1920 | * | |
1921 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
1922 | * send the Communication Up notification to the SCTP user | |
1923 | * upon reception of a valid COOKIE ECHO chunk. | |
07d93967 VY |
1924 | * |
1925 | * Sadly, this needs to be implemented as a side-effect, because | |
1926 | * we are not guaranteed to have set the association id of the real | |
1927 | * association and so these notifications need to be delayed until | |
1928 | * the association id is allocated. | |
1da177e4 | 1929 | */ |
1da177e4 | 1930 | |
07d93967 | 1931 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_CHANGE, SCTP_U8(SCTP_COMM_UP)); |
1da177e4 LT |
1932 | |
1933 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 1934 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 1935 | * delivers this notification to inform the application that of the |
0f3fffd8 | 1936 | * peers requested adaptation layer. |
07d93967 VY |
1937 | * |
1938 | * This also needs to be done as a side effect for the same reason as | |
1939 | * above. | |
1da177e4 | 1940 | */ |
07d93967 VY |
1941 | if (asoc->peer.adaptation_ind) |
1942 | sctp_add_cmd_sf(commands, SCTP_CMD_ADAPTATION_IND, SCTP_NULL()); | |
1da177e4 | 1943 | |
30f6ebf6 XL |
1944 | if (!asoc->peer.auth_capable) |
1945 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_NO_AUTH, SCTP_NULL()); | |
1946 | ||
1da177e4 LT |
1947 | return SCTP_DISPOSITION_CONSUME; |
1948 | ||
1da177e4 LT |
1949 | nomem: |
1950 | return SCTP_DISPOSITION_NOMEM; | |
1951 | } | |
1952 | ||
1953 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'C') | |
1954 | * | |
1955 | * Section 5.2.4 | |
1956 | * C) In this case, the local endpoint's cookie has arrived late. | |
1957 | * Before it arrived, the local endpoint sent an INIT and received an | |
1958 | * INIT-ACK and finally sent a COOKIE ECHO with the peer's same tag | |
1959 | * but a new tag of its own. | |
1960 | */ | |
1961 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1962 | static enum sctp_disposition sctp_sf_do_dupcook_c( |
1963 | struct net *net, | |
24cb81a6 | 1964 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1965 | const struct sctp_association *asoc, |
1966 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1967 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1968 | struct sctp_association *new_asoc) |
1969 | { | |
1970 | /* The cookie should be silently discarded. | |
1971 | * The endpoint SHOULD NOT change states and should leave | |
1972 | * any timers running. | |
1973 | */ | |
1974 | return SCTP_DISPOSITION_DISCARD; | |
1975 | } | |
1976 | ||
1977 | /* Unexpected COOKIE-ECHO handler lost chunk (Table 2, action 'D') | |
1978 | * | |
1979 | * Section 5.2.4 | |
1980 | * | |
1981 | * D) When both local and remote tags match the endpoint should always | |
1982 | * enter the ESTABLISHED state, if it has not already done so. | |
1983 | */ | |
1984 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1985 | static enum sctp_disposition sctp_sf_do_dupcook_d( |
1986 | struct net *net, | |
24cb81a6 | 1987 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1988 | const struct sctp_association *asoc, |
1989 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1990 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1991 | struct sctp_association *new_asoc) |
1992 | { | |
30f6ebf6 | 1993 | struct sctp_ulpevent *ev = NULL, *ai_ev = NULL, *auth_ev = NULL; |
1da177e4 LT |
1994 | struct sctp_chunk *repl; |
1995 | ||
1996 | /* Clarification from Implementor's Guide: | |
1997 | * D) When both local and remote tags match the endpoint should | |
d808ad9a YH |
1998 | * enter the ESTABLISHED state, if it is in the COOKIE-ECHOED state. |
1999 | * It should stop any cookie timer that may be running and send | |
2000 | * a COOKIE ACK. | |
1da177e4 LT |
2001 | */ |
2002 | ||
59d8d443 XL |
2003 | if (!sctp_auth_chunk_verify(net, chunk, asoc)) |
2004 | return SCTP_DISPOSITION_DISCARD; | |
2005 | ||
1da177e4 LT |
2006 | /* Don't accidentally move back into established state. */ |
2007 | if (asoc->state < SCTP_STATE_ESTABLISHED) { | |
2008 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2009 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2010 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2011 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 2012 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
2013 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, |
2014 | SCTP_NULL()); | |
2015 | ||
2016 | /* RFC 2960 5.1 Normal Establishment of an Association | |
2017 | * | |
2018 | * D) IMPLEMENTATION NOTE: An implementation may choose | |
2019 | * to send the Communication Up notification to the | |
2020 | * SCTP user upon reception of a valid COOKIE | |
2021 | * ECHO chunk. | |
2022 | */ | |
df7deeb5 | 2023 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, |
1da177e4 | 2024 | SCTP_COMM_UP, 0, |
df7deeb5 VY |
2025 | asoc->c.sinit_num_ostreams, |
2026 | asoc->c.sinit_max_instreams, | |
9cbcbf4e | 2027 | NULL, GFP_ATOMIC); |
1da177e4 LT |
2028 | if (!ev) |
2029 | goto nomem; | |
1da177e4 LT |
2030 | |
2031 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 2032 | * When a peer sends a Adaptation Layer Indication parameter, |
1da177e4 | 2033 | * SCTP delivers this notification to inform the application |
0f3fffd8 | 2034 | * that of the peers requested adaptation layer. |
1da177e4 | 2035 | */ |
0f3fffd8 ISJ |
2036 | if (asoc->peer.adaptation_ind) { |
2037 | ai_ev = sctp_ulpevent_make_adaptation_indication(asoc, | |
1da177e4 | 2038 | GFP_ATOMIC); |
df7deeb5 | 2039 | if (!ai_ev) |
1da177e4 LT |
2040 | goto nomem; |
2041 | ||
1da177e4 | 2042 | } |
30f6ebf6 XL |
2043 | |
2044 | if (!asoc->peer.auth_capable) { | |
2045 | auth_ev = sctp_ulpevent_make_authkey(asoc, 0, | |
2046 | SCTP_AUTH_NO_AUTH, | |
2047 | GFP_ATOMIC); | |
2048 | if (!auth_ev) | |
2049 | goto nomem; | |
2050 | } | |
1da177e4 | 2051 | } |
1da177e4 | 2052 | |
46e16d4b | 2053 | repl = sctp_make_cookie_ack(asoc, chunk); |
1da177e4 LT |
2054 | if (!repl) |
2055 | goto nomem; | |
2056 | ||
2e3216cd VY |
2057 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
2058 | ||
df7deeb5 VY |
2059 | if (ev) |
2060 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2061 | SCTP_ULPEVENT(ev)); | |
2062 | if (ai_ev) | |
2063 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2064 | SCTP_ULPEVENT(ai_ev)); | |
30f6ebf6 XL |
2065 | if (auth_ev) |
2066 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2067 | SCTP_ULPEVENT(auth_ev)); | |
df7deeb5 | 2068 | |
1da177e4 LT |
2069 | return SCTP_DISPOSITION_CONSUME; |
2070 | ||
2071 | nomem: | |
30f6ebf6 XL |
2072 | if (auth_ev) |
2073 | sctp_ulpevent_free(auth_ev); | |
df7deeb5 VY |
2074 | if (ai_ev) |
2075 | sctp_ulpevent_free(ai_ev); | |
1da177e4 LT |
2076 | if (ev) |
2077 | sctp_ulpevent_free(ev); | |
2078 | return SCTP_DISPOSITION_NOMEM; | |
2079 | } | |
2080 | ||
2081 | /* | |
2082 | * Handle a duplicate COOKIE-ECHO. This usually means a cookie-carrying | |
2083 | * chunk was retransmitted and then delayed in the network. | |
2084 | * | |
2085 | * Section: 5.2.4 Handle a COOKIE ECHO when a TCB exists | |
2086 | * | |
2087 | * Verification Tag: None. Do cookie validation. | |
2088 | * | |
2089 | * Inputs | |
2090 | * (endpoint, asoc, chunk) | |
2091 | * | |
2092 | * Outputs | |
2093 | * (asoc, reply_msg, msg_up, timers, counters) | |
2094 | * | |
2095 | * The return value is the disposition of the chunk. | |
2096 | */ | |
172a1599 XL |
2097 | enum sctp_disposition sctp_sf_do_5_2_4_dupcook( |
2098 | struct net *net, | |
24cb81a6 | 2099 | const struct sctp_endpoint *ep, |
1da177e4 | 2100 | const struct sctp_association *asoc, |
bfc6f827 | 2101 | const union sctp_subtype type, |
1da177e4 | 2102 | void *arg, |
a85bbeb2 | 2103 | struct sctp_cmd_seq *commands) |
1da177e4 | 2104 | { |
1da177e4 | 2105 | struct sctp_association *new_asoc; |
172a1599 XL |
2106 | struct sctp_chunk *chunk = arg; |
2107 | enum sctp_disposition retval; | |
2108 | struct sctp_chunk *err_chk_p; | |
1da177e4 LT |
2109 | int error = 0; |
2110 | char action; | |
1da177e4 LT |
2111 | |
2112 | /* Make sure that the chunk has a valid length from the protocol | |
2113 | * perspective. In this case check to make sure we have at least | |
2114 | * enough for the chunk header. Cookie length verification is | |
2115 | * done later. | |
2116 | */ | |
922dbc5b | 2117 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2118 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2119 | commands); |
2120 | ||
2121 | /* "Decode" the chunk. We have no optional parameters so we | |
2122 | * are in good shape. | |
2123 | */ | |
d808ad9a | 2124 | chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 2125 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 2126 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 2127 | goto nomem; |
1da177e4 LT |
2128 | |
2129 | /* In RFC 2960 5.2.4 3, if both Verification Tags in the State Cookie | |
2130 | * of a duplicate COOKIE ECHO match the Verification Tags of the | |
2131 | * current association, consider the State Cookie valid even if | |
2132 | * the lifespan is exceeded. | |
2133 | */ | |
2134 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
2135 | &err_chk_p); | |
2136 | ||
2137 | /* FIXME: | |
2138 | * If the re-build failed, what is the proper error path | |
2139 | * from here? | |
2140 | * | |
2141 | * [We should abort the association. --piggy] | |
2142 | */ | |
2143 | if (!new_asoc) { | |
2144 | /* FIXME: Several errors are possible. A bad cookie should | |
2145 | * be silently discarded, but think about logging it too. | |
2146 | */ | |
2147 | switch (error) { | |
2148 | case -SCTP_IERROR_NOMEM: | |
2149 | goto nomem; | |
2150 | ||
2151 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 2152 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 2153 | err_chk_p); |
24cb81a6 | 2154 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2155 | case -SCTP_IERROR_BAD_SIG: |
2156 | default: | |
24cb81a6 | 2157 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 2158 | } |
1da177e4 LT |
2159 | } |
2160 | ||
2277c7cd RH |
2161 | /* Update socket peer label if first association. */ |
2162 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
2163 | chunk->skb)) | |
2164 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2165 | ||
7e062977 XL |
2166 | /* Set temp so that it won't be added into hashtable */ |
2167 | new_asoc->temp = 1; | |
2168 | ||
1da177e4 LT |
2169 | /* Compare the tie_tag in cookie with the verification tag of |
2170 | * current association. | |
2171 | */ | |
2172 | action = sctp_tietags_compare(new_asoc, asoc); | |
2173 | ||
2174 | switch (action) { | |
2175 | case 'A': /* Association restart. */ | |
24cb81a6 | 2176 | retval = sctp_sf_do_dupcook_a(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2177 | new_asoc); |
2178 | break; | |
2179 | ||
2180 | case 'B': /* Collision case B. */ | |
24cb81a6 | 2181 | retval = sctp_sf_do_dupcook_b(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2182 | new_asoc); |
2183 | break; | |
2184 | ||
2185 | case 'C': /* Collision case C. */ | |
24cb81a6 | 2186 | retval = sctp_sf_do_dupcook_c(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2187 | new_asoc); |
2188 | break; | |
2189 | ||
2190 | case 'D': /* Collision case D. */ | |
24cb81a6 | 2191 | retval = sctp_sf_do_dupcook_d(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2192 | new_asoc); |
2193 | break; | |
2194 | ||
2195 | default: /* Discard packet for all others. */ | |
24cb81a6 | 2196 | retval = sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2197 | break; |
3ff50b79 | 2198 | } |
1da177e4 LT |
2199 | |
2200 | /* Delete the tempory new association. */ | |
f2815633 | 2201 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, SCTP_ASOC(new_asoc)); |
1da177e4 LT |
2202 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
2203 | ||
d5ccd496 MM |
2204 | /* Restore association pointer to provide SCTP command interpeter |
2205 | * with a valid context in case it needs to manipulate | |
2206 | * the queues */ | |
2207 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, | |
2208 | SCTP_ASOC((struct sctp_association *)asoc)); | |
2209 | ||
1da177e4 LT |
2210 | return retval; |
2211 | ||
2212 | nomem: | |
2213 | return SCTP_DISPOSITION_NOMEM; | |
2214 | } | |
2215 | ||
2216 | /* | |
2217 | * Process an ABORT. (SHUTDOWN-PENDING state) | |
2218 | * | |
2219 | * See sctp_sf_do_9_1_abort(). | |
2220 | */ | |
172a1599 XL |
2221 | enum sctp_disposition sctp_sf_shutdown_pending_abort( |
2222 | struct net *net, | |
2223 | const struct sctp_endpoint *ep, | |
2224 | const struct sctp_association *asoc, | |
2225 | const union sctp_subtype type, | |
2226 | void *arg, | |
2227 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2228 | { |
2229 | struct sctp_chunk *chunk = arg; | |
2230 | ||
2231 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2232 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2233 | |
2234 | /* Make sure that the ABORT chunk has a valid length. | |
2235 | * Since this is an ABORT chunk, we have to discard it | |
2236 | * because of the following text: | |
2237 | * RFC 2960, Section 3.3.7 | |
2238 | * If an endpoint receives an ABORT with a format error or for an | |
2239 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2240 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2241 | * as we do not know its true length. So, to be safe, discard the |
2242 | * packet. | |
2243 | */ | |
441ae65a | 2244 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2245 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2246 | |
75205f47 VY |
2247 | /* ADD-IP: Special case for ABORT chunks |
2248 | * F4) One special consideration is that ABORT Chunks arriving | |
2249 | * destined to the IP address being deleted MUST be | |
2250 | * ignored (see Section 5.3.1 for further details). | |
2251 | */ | |
2252 | if (SCTP_ADDR_DEL == | |
2253 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2254 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2255 | |
24cb81a6 | 2256 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2257 | } |
2258 | ||
2259 | /* | |
2260 | * Process an ABORT. (SHUTDOWN-SENT state) | |
2261 | * | |
2262 | * See sctp_sf_do_9_1_abort(). | |
2263 | */ | |
172a1599 XL |
2264 | enum sctp_disposition sctp_sf_shutdown_sent_abort( |
2265 | struct net *net, | |
24cb81a6 | 2266 | const struct sctp_endpoint *ep, |
1da177e4 | 2267 | const struct sctp_association *asoc, |
bfc6f827 | 2268 | const union sctp_subtype type, |
1da177e4 | 2269 | void *arg, |
a85bbeb2 | 2270 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2271 | { |
2272 | struct sctp_chunk *chunk = arg; | |
2273 | ||
2274 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2275 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2276 | |
2277 | /* Make sure that the ABORT chunk has a valid length. | |
2278 | * Since this is an ABORT chunk, we have to discard it | |
2279 | * because of the following text: | |
2280 | * RFC 2960, Section 3.3.7 | |
2281 | * If an endpoint receives an ABORT with a format error or for an | |
2282 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2283 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2284 | * as we do not know its true length. So, to be safe, discard the |
2285 | * packet. | |
2286 | */ | |
441ae65a | 2287 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2288 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2289 | |
75205f47 VY |
2290 | /* ADD-IP: Special case for ABORT chunks |
2291 | * F4) One special consideration is that ABORT Chunks arriving | |
2292 | * destined to the IP address being deleted MUST be | |
2293 | * ignored (see Section 5.3.1 for further details). | |
2294 | */ | |
2295 | if (SCTP_ADDR_DEL == | |
2296 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2297 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2298 | |
1da177e4 LT |
2299 | /* Stop the T2-shutdown timer. */ |
2300 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2301 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2302 | ||
2303 | /* Stop the T5-shutdown guard timer. */ | |
2304 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2305 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
2306 | ||
24cb81a6 | 2307 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2308 | } |
2309 | ||
2310 | /* | |
2311 | * Process an ABORT. (SHUTDOWN-ACK-SENT state) | |
2312 | * | |
2313 | * See sctp_sf_do_9_1_abort(). | |
2314 | */ | |
172a1599 XL |
2315 | enum sctp_disposition sctp_sf_shutdown_ack_sent_abort( |
2316 | struct net *net, | |
2317 | const struct sctp_endpoint *ep, | |
2318 | const struct sctp_association *asoc, | |
2319 | const union sctp_subtype type, | |
2320 | void *arg, | |
2321 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2322 | { |
2323 | /* The same T2 timer, so we should be able to use | |
2324 | * common function with the SHUTDOWN-SENT state. | |
2325 | */ | |
24cb81a6 | 2326 | return sctp_sf_shutdown_sent_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2327 | } |
2328 | ||
2329 | /* | |
2330 | * Handle an Error received in COOKIE_ECHOED state. | |
2331 | * | |
2332 | * Only handle the error type of stale COOKIE Error, the other errors will | |
2333 | * be ignored. | |
2334 | * | |
2335 | * Inputs | |
2336 | * (endpoint, asoc, chunk) | |
2337 | * | |
2338 | * Outputs | |
2339 | * (asoc, reply_msg, msg_up, timers, counters) | |
2340 | * | |
2341 | * The return value is the disposition of the chunk. | |
2342 | */ | |
172a1599 XL |
2343 | enum sctp_disposition sctp_sf_cookie_echoed_err( |
2344 | struct net *net, | |
24cb81a6 | 2345 | const struct sctp_endpoint *ep, |
1da177e4 | 2346 | const struct sctp_association *asoc, |
bfc6f827 | 2347 | const union sctp_subtype type, |
1da177e4 | 2348 | void *arg, |
a85bbeb2 | 2349 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2350 | { |
2351 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 2352 | struct sctp_errhdr *err; |
1da177e4 LT |
2353 | |
2354 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2355 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2356 | |
2357 | /* Make sure that the ERROR chunk has a valid length. | |
2358 | * The parameter walking depends on this as well. | |
2359 | */ | |
87caeba7 | 2360 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 2361 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2362 | commands); |
2363 | ||
2364 | /* Process the error here */ | |
2365 | /* FUTURE FIXME: When PR-SCTP related and other optional | |
2366 | * parms are emitted, this will have to change to handle multiple | |
2367 | * errors. | |
2368 | */ | |
2369 | sctp_walk_errors(err, chunk->chunk_hdr) { | |
2370 | if (SCTP_ERROR_STALE_COOKIE == err->cause) | |
24cb81a6 | 2371 | return sctp_sf_do_5_2_6_stale(net, ep, asoc, type, |
1da177e4 LT |
2372 | arg, commands); |
2373 | } | |
2374 | ||
2375 | /* It is possible to have malformed error causes, and that | |
2376 | * will cause us to end the walk early. However, since | |
2377 | * we are discarding the packet, there should be no adverse | |
2378 | * affects. | |
2379 | */ | |
24cb81a6 | 2380 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2381 | } |
2382 | ||
2383 | /* | |
2384 | * Handle a Stale COOKIE Error | |
2385 | * | |
2386 | * Section: 5.2.6 Handle Stale COOKIE Error | |
2387 | * If the association is in the COOKIE-ECHOED state, the endpoint may elect | |
2388 | * one of the following three alternatives. | |
2389 | * ... | |
2390 | * 3) Send a new INIT chunk to the endpoint, adding a Cookie | |
2391 | * Preservative parameter requesting an extension to the lifetime of | |
2392 | * the State Cookie. When calculating the time extension, an | |
2393 | * implementation SHOULD use the RTT information measured based on the | |
2394 | * previous COOKIE ECHO / ERROR exchange, and should add no more | |
2395 | * than 1 second beyond the measured RTT, due to long State Cookie | |
2396 | * lifetimes making the endpoint more subject to a replay attack. | |
2397 | * | |
2398 | * Verification Tag: Not explicit, but safe to ignore. | |
2399 | * | |
2400 | * Inputs | |
2401 | * (endpoint, asoc, chunk) | |
2402 | * | |
2403 | * Outputs | |
2404 | * (asoc, reply_msg, msg_up, timers, counters) | |
2405 | * | |
2406 | * The return value is the disposition of the chunk. | |
2407 | */ | |
172a1599 XL |
2408 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
2409 | struct net *net, | |
2410 | const struct sctp_endpoint *ep, | |
2411 | const struct sctp_association *asoc, | |
2412 | const union sctp_subtype type, | |
2413 | void *arg, | |
2414 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2415 | { |
3f7a87d2 | 2416 | int attempts = asoc->init_err_counter + 1; |
365ddb65 XL |
2417 | struct sctp_chunk *chunk = arg, *reply; |
2418 | struct sctp_cookie_preserve_param bht; | |
2419 | struct sctp_bind_addr *bp; | |
d8238d9d | 2420 | struct sctp_errhdr *err; |
365ddb65 | 2421 | u32 stale; |
1da177e4 | 2422 | |
81845c21 | 2423 | if (attempts > asoc->max_init_attempts) { |
8de8c873 SS |
2424 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
2425 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 2426 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 2427 | SCTP_PERR(SCTP_ERROR_STALE_COOKIE)); |
1da177e4 LT |
2428 | return SCTP_DISPOSITION_DELETE_TCB; |
2429 | } | |
2430 | ||
d8238d9d | 2431 | err = (struct sctp_errhdr *)(chunk->skb->data); |
1da177e4 LT |
2432 | |
2433 | /* When calculating the time extension, an implementation | |
2434 | * SHOULD use the RTT information measured based on the | |
2435 | * previous COOKIE ECHO / ERROR exchange, and should add no | |
2436 | * more than 1 second beyond the measured RTT, due to long | |
2437 | * State Cookie lifetimes making the endpoint more subject to | |
2438 | * a replay attack. | |
2439 | * Measure of Staleness's unit is usec. (1/1000000 sec) | |
2440 | * Suggested Cookie Life-span Increment's unit is msec. | |
2441 | * (1/1000 sec) | |
2442 | * In general, if you use the suggested cookie life, the value | |
2443 | * found in the field of measure of staleness should be doubled | |
2444 | * to give ample time to retransmit the new cookie and thus | |
2445 | * yield a higher probability of success on the reattempt. | |
2446 | */ | |
d8238d9d | 2447 | stale = ntohl(*(__be32 *)((u8 *)err + sizeof(*err))); |
1da177e4 LT |
2448 | stale = (stale * 2) / 1000; |
2449 | ||
2450 | bht.param_hdr.type = SCTP_PARAM_COOKIE_PRESERVATIVE; | |
2451 | bht.param_hdr.length = htons(sizeof(bht)); | |
2452 | bht.lifespan_increment = htonl(stale); | |
2453 | ||
2454 | /* Build that new INIT chunk. */ | |
2455 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; | |
2456 | reply = sctp_make_init(asoc, bp, GFP_ATOMIC, sizeof(bht)); | |
2457 | if (!reply) | |
2458 | goto nomem; | |
2459 | ||
2460 | sctp_addto_chunk(reply, sizeof(bht), &bht); | |
2461 | ||
2462 | /* Clear peer's init_tag cached in assoc as we are sending a new INIT */ | |
2463 | sctp_add_cmd_sf(commands, SCTP_CMD_CLEAR_INIT_TAG, SCTP_NULL()); | |
2464 | ||
2465 | /* Stop pending T3-rtx and heartbeat timers */ | |
2466 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); | |
2467 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
2468 | ||
2469 | /* Delete non-primary peer ip addresses since we are transitioning | |
2470 | * back to the COOKIE-WAIT state | |
2471 | */ | |
2472 | sctp_add_cmd_sf(commands, SCTP_CMD_DEL_NON_PRIMARY, SCTP_NULL()); | |
2473 | ||
d808ad9a YH |
2474 | /* If we've sent any data bundled with COOKIE-ECHO we will need to |
2475 | * resend | |
1da177e4 | 2476 | */ |
b6157d8e | 2477 | sctp_add_cmd_sf(commands, SCTP_CMD_T1_RETRAN, |
1da177e4 LT |
2478 | SCTP_TRANSPORT(asoc->peer.primary_path)); |
2479 | ||
2480 | /* Cast away the const modifier, as we want to just | |
2481 | * rerun it through as a sideffect. | |
2482 | */ | |
3f7a87d2 | 2483 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_INC, SCTP_NULL()); |
1da177e4 LT |
2484 | |
2485 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2486 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2487 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2488 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
2489 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
2490 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
2491 | ||
2492 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2493 | ||
2494 | return SCTP_DISPOSITION_CONSUME; | |
2495 | ||
2496 | nomem: | |
2497 | return SCTP_DISPOSITION_NOMEM; | |
2498 | } | |
2499 | ||
2500 | /* | |
2501 | * Process an ABORT. | |
2502 | * | |
2503 | * Section: 9.1 | |
2504 | * After checking the Verification Tag, the receiving endpoint shall | |
2505 | * remove the association from its record, and shall report the | |
2506 | * termination to its upper layer. | |
2507 | * | |
2508 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
2509 | * B) Rules for packet carrying ABORT: | |
2510 | * | |
2511 | * - The endpoint shall always fill in the Verification Tag field of the | |
2512 | * outbound packet with the destination endpoint's tag value if it | |
2513 | * is known. | |
2514 | * | |
2515 | * - If the ABORT is sent in response to an OOTB packet, the endpoint | |
2516 | * MUST follow the procedure described in Section 8.4. | |
2517 | * | |
2518 | * - The receiver MUST accept the packet if the Verification Tag | |
2519 | * matches either its own tag, OR the tag of its peer. Otherwise, the | |
2520 | * receiver MUST silently discard the packet and take no further | |
2521 | * action. | |
2522 | * | |
2523 | * Inputs | |
2524 | * (endpoint, asoc, chunk) | |
2525 | * | |
2526 | * Outputs | |
2527 | * (asoc, reply_msg, msg_up, timers, counters) | |
2528 | * | |
2529 | * The return value is the disposition of the chunk. | |
2530 | */ | |
172a1599 XL |
2531 | enum sctp_disposition sctp_sf_do_9_1_abort( |
2532 | struct net *net, | |
24cb81a6 | 2533 | const struct sctp_endpoint *ep, |
1da177e4 | 2534 | const struct sctp_association *asoc, |
bfc6f827 | 2535 | const union sctp_subtype type, |
1da177e4 | 2536 | void *arg, |
a85bbeb2 | 2537 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2538 | { |
2539 | struct sctp_chunk *chunk = arg; | |
1da177e4 LT |
2540 | |
2541 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2542 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2543 | |
2544 | /* Make sure that the ABORT chunk has a valid length. | |
2545 | * Since this is an ABORT chunk, we have to discard it | |
2546 | * because of the following text: | |
2547 | * RFC 2960, Section 3.3.7 | |
2548 | * If an endpoint receives an ABORT with a format error or for an | |
2549 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2550 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2551 | * as we do not know its true length. So, to be safe, discard the |
2552 | * packet. | |
2553 | */ | |
441ae65a | 2554 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2555 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2556 | |
75205f47 VY |
2557 | /* ADD-IP: Special case for ABORT chunks |
2558 | * F4) One special consideration is that ABORT Chunks arriving | |
2559 | * destined to the IP address being deleted MUST be | |
2560 | * ignored (see Section 5.3.1 for further details). | |
2561 | */ | |
2562 | if (SCTP_ADDR_DEL == | |
2563 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2564 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2565 | |
24cb81a6 | 2566 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
75205f47 VY |
2567 | } |
2568 | ||
172a1599 XL |
2569 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
2570 | struct net *net, | |
24cb81a6 | 2571 | const struct sctp_endpoint *ep, |
75205f47 | 2572 | const struct sctp_association *asoc, |
bfc6f827 | 2573 | const union sctp_subtype type, |
75205f47 | 2574 | void *arg, |
a85bbeb2 | 2575 | struct sctp_cmd_seq *commands) |
75205f47 | 2576 | { |
172a1599 | 2577 | __be16 error = SCTP_ERROR_NO_ERROR; |
75205f47 | 2578 | struct sctp_chunk *chunk = arg; |
95c96174 | 2579 | unsigned int len; |
75205f47 | 2580 | |
1da177e4 LT |
2581 | /* See if we have an error cause code in the chunk. */ |
2582 | len = ntohs(chunk->chunk_hdr->length); | |
96ca468b | 2583 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) { |
d8238d9d | 2584 | struct sctp_errhdr *err; |
96ca468b | 2585 | |
96ca468b SW |
2586 | sctp_walk_errors(err, chunk->chunk_hdr); |
2587 | if ((void *)err != (void *)chunk->chunk_end) | |
d8238d9d XL |
2588 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
2589 | commands); | |
96ca468b | 2590 | |
d8238d9d | 2591 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
96ca468b | 2592 | } |
1da177e4 | 2593 | |
8de8c873 | 2594 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNRESET)); |
d808ad9a | 2595 | /* ASSOC_FAILED will DELETE_TCB. */ |
5be291fe | 2596 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(error)); |
b01a2407 EB |
2597 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
2598 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
2599 | |
2600 | return SCTP_DISPOSITION_ABORT; | |
2601 | } | |
2602 | ||
2603 | /* | |
2604 | * Process an ABORT. (COOKIE-WAIT state) | |
2605 | * | |
2606 | * See sctp_sf_do_9_1_abort() above. | |
2607 | */ | |
172a1599 XL |
2608 | enum sctp_disposition sctp_sf_cookie_wait_abort( |
2609 | struct net *net, | |
2610 | const struct sctp_endpoint *ep, | |
2611 | const struct sctp_association *asoc, | |
2612 | const union sctp_subtype type, | |
2613 | void *arg, | |
2614 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2615 | { |
172a1599 | 2616 | __be16 error = SCTP_ERROR_NO_ERROR; |
1da177e4 | 2617 | struct sctp_chunk *chunk = arg; |
95c96174 | 2618 | unsigned int len; |
1da177e4 LT |
2619 | |
2620 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2621 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2622 | |
2623 | /* Make sure that the ABORT chunk has a valid length. | |
2624 | * Since this is an ABORT chunk, we have to discard it | |
2625 | * because of the following text: | |
2626 | * RFC 2960, Section 3.3.7 | |
2627 | * If an endpoint receives an ABORT with a format error or for an | |
2628 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2629 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2630 | * as we do not know its true length. So, to be safe, discard the |
2631 | * packet. | |
2632 | */ | |
441ae65a | 2633 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2634 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2635 | |
2636 | /* See if we have an error cause code in the chunk. */ | |
2637 | len = ntohs(chunk->chunk_hdr->length); | |
2638 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) | |
d8238d9d | 2639 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
1da177e4 | 2640 | |
24cb81a6 | 2641 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, asoc, |
8de8c873 | 2642 | chunk->transport); |
1da177e4 LT |
2643 | } |
2644 | ||
2645 | /* | |
2646 | * Process an incoming ICMP as an ABORT. (COOKIE-WAIT state) | |
2647 | */ | |
172a1599 XL |
2648 | enum sctp_disposition sctp_sf_cookie_wait_icmp_abort( |
2649 | struct net *net, | |
24cb81a6 | 2650 | const struct sctp_endpoint *ep, |
1da177e4 | 2651 | const struct sctp_association *asoc, |
bfc6f827 | 2652 | const union sctp_subtype type, |
1da177e4 | 2653 | void *arg, |
a85bbeb2 | 2654 | struct sctp_cmd_seq *commands) |
1da177e4 | 2655 | { |
24cb81a6 | 2656 | return sctp_stop_t1_and_abort(net, commands, SCTP_ERROR_NO_ERROR, |
8de8c873 | 2657 | ENOPROTOOPT, asoc, |
3f7a87d2 | 2658 | (struct sctp_transport *)arg); |
1da177e4 LT |
2659 | } |
2660 | ||
2661 | /* | |
2662 | * Process an ABORT. (COOKIE-ECHOED state) | |
2663 | */ | |
172a1599 XL |
2664 | enum sctp_disposition sctp_sf_cookie_echoed_abort( |
2665 | struct net *net, | |
2666 | const struct sctp_endpoint *ep, | |
2667 | const struct sctp_association *asoc, | |
2668 | const union sctp_subtype type, | |
2669 | void *arg, | |
2670 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2671 | { |
2672 | /* There is a single T1 timer, so we should be able to use | |
2673 | * common function with the COOKIE-WAIT state. | |
2674 | */ | |
24cb81a6 | 2675 | return sctp_sf_cookie_wait_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2676 | } |
2677 | ||
2678 | /* | |
2679 | * Stop T1 timer and abort association with "INIT failed". | |
2680 | * | |
2681 | * This is common code called by several sctp_sf_*_abort() functions above. | |
2682 | */ | |
172a1599 XL |
2683 | static enum sctp_disposition sctp_stop_t1_and_abort( |
2684 | struct net *net, | |
2685 | struct sctp_cmd_seq *commands, | |
2686 | __be16 error, int sk_err, | |
2687 | const struct sctp_association *asoc, | |
2688 | struct sctp_transport *transport) | |
1da177e4 | 2689 | { |
bb33381d DB |
2690 | pr_debug("%s: ABORT received (INIT)\n", __func__); |
2691 | ||
1da177e4 LT |
2692 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
2693 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
24cb81a6 | 2694 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
2695 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
2696 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
8de8c873 | 2697 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(sk_err)); |
1da177e4 LT |
2698 | /* CMD_INIT_FAILED will DELETE_TCB. */ |
2699 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 2700 | SCTP_PERR(error)); |
bb33381d | 2701 | |
3f7a87d2 | 2702 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
2703 | } |
2704 | ||
2705 | /* | |
2706 | * sctp_sf_do_9_2_shut | |
2707 | * | |
2708 | * Section: 9.2 | |
2709 | * Upon the reception of the SHUTDOWN, the peer endpoint shall | |
2710 | * - enter the SHUTDOWN-RECEIVED state, | |
2711 | * | |
2712 | * - stop accepting new data from its SCTP user | |
2713 | * | |
2714 | * - verify, by checking the Cumulative TSN Ack field of the chunk, | |
2715 | * that all its outstanding DATA chunks have been received by the | |
2716 | * SHUTDOWN sender. | |
2717 | * | |
2718 | * Once an endpoint as reached the SHUTDOWN-RECEIVED state it MUST NOT | |
2719 | * send a SHUTDOWN in response to a ULP request. And should discard | |
2720 | * subsequent SHUTDOWN chunks. | |
2721 | * | |
2722 | * If there are still outstanding DATA chunks left, the SHUTDOWN | |
2723 | * receiver shall continue to follow normal data transmission | |
2724 | * procedures defined in Section 6 until all outstanding DATA chunks | |
2725 | * are acknowledged; however, the SHUTDOWN receiver MUST NOT accept | |
2726 | * new data from its SCTP user. | |
2727 | * | |
2728 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2729 | * | |
2730 | * Inputs | |
2731 | * (endpoint, asoc, chunk) | |
2732 | * | |
2733 | * Outputs | |
2734 | * (asoc, reply_msg, msg_up, timers, counters) | |
2735 | * | |
2736 | * The return value is the disposition of the chunk. | |
2737 | */ | |
172a1599 XL |
2738 | enum sctp_disposition sctp_sf_do_9_2_shutdown( |
2739 | struct net *net, | |
2740 | const struct sctp_endpoint *ep, | |
2741 | const struct sctp_association *asoc, | |
2742 | const union sctp_subtype type, | |
2743 | void *arg, | |
2744 | struct sctp_cmd_seq *commands) | |
2745 | { | |
2746 | enum sctp_disposition disposition; | |
1da177e4 | 2747 | struct sctp_chunk *chunk = arg; |
e61e4055 | 2748 | struct sctp_shutdownhdr *sdh; |
1da177e4 | 2749 | struct sctp_ulpevent *ev; |
df10eec4 | 2750 | __u32 ctsn; |
1da177e4 LT |
2751 | |
2752 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2753 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2754 | |
2755 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2756 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2757 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2758 | commands); |
2759 | ||
2760 | /* Convert the elaborate header. */ | |
e61e4055 XL |
2761 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
2762 | skb_pull(chunk->skb, sizeof(*sdh)); | |
1da177e4 | 2763 | chunk->subh.shutdown_hdr = sdh; |
df10eec4 WY |
2764 | ctsn = ntohl(sdh->cum_tsn_ack); |
2765 | ||
a2f36eec | 2766 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { |
bb33381d DB |
2767 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2768 | asoc->ctsn_ack_point); | |
2769 | ||
a2f36eec WY |
2770 | return SCTP_DISPOSITION_DISCARD; |
2771 | } | |
2772 | ||
df10eec4 WY |
2773 | /* If Cumulative TSN Ack beyond the max tsn currently |
2774 | * send, terminating the association and respond to the | |
2775 | * sender with an ABORT. | |
2776 | */ | |
2777 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 2778 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
1da177e4 | 2779 | |
eb0e0076 SS |
2780 | /* API 5.3.1.5 SCTP_SHUTDOWN_EVENT |
2781 | * When a peer sends a SHUTDOWN, SCTP delivers this notification to | |
2782 | * inform the application that it should cease sending data. | |
2783 | */ | |
2784 | ev = sctp_ulpevent_make_shutdown_event(asoc, 0, GFP_ATOMIC); | |
2785 | if (!ev) { | |
2786 | disposition = SCTP_DISPOSITION_NOMEM; | |
d808ad9a | 2787 | goto out; |
eb0e0076 SS |
2788 | } |
2789 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
2790 | ||
1da177e4 LT |
2791 | /* Upon the reception of the SHUTDOWN, the peer endpoint shall |
2792 | * - enter the SHUTDOWN-RECEIVED state, | |
2793 | * - stop accepting new data from its SCTP user | |
2794 | * | |
2795 | * [This is implicit in the new state.] | |
2796 | */ | |
2797 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2798 | SCTP_STATE(SCTP_STATE_SHUTDOWN_RECEIVED)); | |
2799 | disposition = SCTP_DISPOSITION_CONSUME; | |
2800 | ||
2801 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 2802 | disposition = sctp_sf_do_9_2_shutdown_ack(net, ep, asoc, type, |
1da177e4 LT |
2803 | arg, commands); |
2804 | } | |
2805 | ||
2806 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
2807 | goto out; | |
2808 | ||
2809 | /* - verify, by checking the Cumulative TSN Ack field of the | |
2810 | * chunk, that all its outstanding DATA chunks have been | |
2811 | * received by the SHUTDOWN sender. | |
2812 | */ | |
2813 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2178eda8 | 2814 | SCTP_BE32(chunk->subh.shutdown_hdr->cum_tsn_ack)); |
1da177e4 | 2815 | |
1da177e4 LT |
2816 | out: |
2817 | return disposition; | |
2818 | } | |
2819 | ||
2e3f92da WY |
2820 | /* |
2821 | * sctp_sf_do_9_2_shut_ctsn | |
2822 | * | |
2823 | * Once an endpoint has reached the SHUTDOWN-RECEIVED state, | |
2824 | * it MUST NOT send a SHUTDOWN in response to a ULP request. | |
2825 | * The Cumulative TSN Ack of the received SHUTDOWN chunk | |
2826 | * MUST be processed. | |
2827 | */ | |
172a1599 XL |
2828 | enum sctp_disposition sctp_sf_do_9_2_shut_ctsn( |
2829 | struct net *net, | |
2830 | const struct sctp_endpoint *ep, | |
2831 | const struct sctp_association *asoc, | |
2832 | const union sctp_subtype type, | |
2833 | void *arg, | |
2834 | struct sctp_cmd_seq *commands) | |
2e3f92da WY |
2835 | { |
2836 | struct sctp_chunk *chunk = arg; | |
e61e4055 | 2837 | struct sctp_shutdownhdr *sdh; |
a2f36eec | 2838 | __u32 ctsn; |
2e3f92da WY |
2839 | |
2840 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2841 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2842 | |
2843 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2844 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2845 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
2e3f92da WY |
2846 | commands); |
2847 | ||
e61e4055 | 2848 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
a2f36eec WY |
2849 | ctsn = ntohl(sdh->cum_tsn_ack); |
2850 | ||
2851 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
2852 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2853 | asoc->ctsn_ack_point); | |
2854 | ||
a2f36eec WY |
2855 | return SCTP_DISPOSITION_DISCARD; |
2856 | } | |
2e3f92da WY |
2857 | |
2858 | /* If Cumulative TSN Ack beyond the max tsn currently | |
2859 | * send, terminating the association and respond to the | |
2860 | * sender with an ABORT. | |
2861 | */ | |
a2f36eec | 2862 | if (!TSN_lt(ctsn, asoc->next_tsn)) |
24cb81a6 | 2863 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2864 | |
2865 | /* verify, by checking the Cumulative TSN Ack field of the | |
2866 | * chunk, that all its outstanding DATA chunks have been | |
2867 | * received by the SHUTDOWN sender. | |
2868 | */ | |
2869 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2870 | SCTP_BE32(sdh->cum_tsn_ack)); | |
2871 | ||
2872 | return SCTP_DISPOSITION_CONSUME; | |
2873 | } | |
2874 | ||
1da177e4 LT |
2875 | /* RFC 2960 9.2 |
2876 | * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk | |
2877 | * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination | |
2878 | * transport addresses (either in the IP addresses or in the INIT chunk) | |
2879 | * that belong to this association, it should discard the INIT chunk and | |
2880 | * retransmit the SHUTDOWN ACK chunk. | |
2881 | */ | |
172a1599 XL |
2882 | enum sctp_disposition sctp_sf_do_9_2_reshutack( |
2883 | struct net *net, | |
2884 | const struct sctp_endpoint *ep, | |
2885 | const struct sctp_association *asoc, | |
2886 | const union sctp_subtype type, | |
2887 | void *arg, | |
2888 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2889 | { |
172a1599 | 2890 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
2891 | struct sctp_chunk *reply; |
2892 | ||
ece25dfa | 2893 | /* Make sure that the chunk has a valid length */ |
922dbc5b | 2894 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2895 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
2896 | commands); |
2897 | ||
1da177e4 LT |
2898 | /* Since we are not going to really process this INIT, there |
2899 | * is no point in verifying chunk boundries. Just generate | |
2900 | * the SHUTDOWN ACK. | |
2901 | */ | |
2902 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
2903 | if (NULL == reply) | |
2904 | goto nomem; | |
2905 | ||
2906 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
2907 | * the T2-SHUTDOWN timer. | |
2908 | */ | |
2909 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
2910 | ||
2911 | /* and restart the T2-shutdown timer. */ | |
2912 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
2913 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2914 | ||
2915 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2916 | ||
2917 | return SCTP_DISPOSITION_CONSUME; | |
2918 | nomem: | |
2919 | return SCTP_DISPOSITION_NOMEM; | |
2920 | } | |
2921 | ||
2922 | /* | |
2923 | * sctp_sf_do_ecn_cwr | |
2924 | * | |
2925 | * Section: Appendix A: Explicit Congestion Notification | |
2926 | * | |
2927 | * CWR: | |
2928 | * | |
2929 | * RFC 2481 details a specific bit for a sender to send in the header of | |
2930 | * its next outbound TCP segment to indicate to its peer that it has | |
2931 | * reduced its congestion window. This is termed the CWR bit. For | |
2932 | * SCTP the same indication is made by including the CWR chunk. | |
2933 | * This chunk contains one data element, i.e. the TSN number that | |
2934 | * was sent in the ECNE chunk. This element represents the lowest | |
2935 | * TSN number in the datagram that was originally marked with the | |
2936 | * CE bit. | |
2937 | * | |
2938 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2939 | * Inputs | |
2940 | * (endpoint, asoc, chunk) | |
2941 | * | |
2942 | * Outputs | |
2943 | * (asoc, reply_msg, msg_up, timers, counters) | |
2944 | * | |
2945 | * The return value is the disposition of the chunk. | |
2946 | */ | |
172a1599 XL |
2947 | enum sctp_disposition sctp_sf_do_ecn_cwr(struct net *net, |
2948 | const struct sctp_endpoint *ep, | |
2949 | const struct sctp_association *asoc, | |
2950 | const union sctp_subtype type, | |
2951 | void *arg, | |
2952 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2953 | { |
1da177e4 | 2954 | struct sctp_chunk *chunk = arg; |
65f77105 | 2955 | struct sctp_cwrhdr *cwr; |
34bcca28 | 2956 | u32 lowest_tsn; |
1da177e4 LT |
2957 | |
2958 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2959 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2960 | |
b515fd27 | 2961 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 2962 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 2963 | commands); |
d808ad9a | 2964 | |
65f77105 XL |
2965 | cwr = (struct sctp_cwrhdr *)chunk->skb->data; |
2966 | skb_pull(chunk->skb, sizeof(*cwr)); | |
1da177e4 | 2967 | |
34bcca28 | 2968 | lowest_tsn = ntohl(cwr->lowest_tsn); |
1da177e4 LT |
2969 | |
2970 | /* Does this CWR ack the last sent congestion notification? */ | |
34bcca28 | 2971 | if (TSN_lte(asoc->last_ecne_tsn, lowest_tsn)) { |
1da177e4 LT |
2972 | /* Stop sending ECNE. */ |
2973 | sctp_add_cmd_sf(commands, | |
2974 | SCTP_CMD_ECN_CWR, | |
34bcca28 | 2975 | SCTP_U32(lowest_tsn)); |
1da177e4 LT |
2976 | } |
2977 | return SCTP_DISPOSITION_CONSUME; | |
2978 | } | |
2979 | ||
2980 | /* | |
2981 | * sctp_sf_do_ecne | |
2982 | * | |
2983 | * Section: Appendix A: Explicit Congestion Notification | |
2984 | * | |
2985 | * ECN-Echo | |
2986 | * | |
2987 | * RFC 2481 details a specific bit for a receiver to send back in its | |
2988 | * TCP acknowledgements to notify the sender of the Congestion | |
2989 | * Experienced (CE) bit having arrived from the network. For SCTP this | |
2990 | * same indication is made by including the ECNE chunk. This chunk | |
2991 | * contains one data element, i.e. the lowest TSN associated with the IP | |
2992 | * datagram marked with the CE bit..... | |
2993 | * | |
2994 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2995 | * Inputs | |
2996 | * (endpoint, asoc, chunk) | |
2997 | * | |
2998 | * Outputs | |
2999 | * (asoc, reply_msg, msg_up, timers, counters) | |
3000 | * | |
3001 | * The return value is the disposition of the chunk. | |
3002 | */ | |
172a1599 XL |
3003 | enum sctp_disposition sctp_sf_do_ecne(struct net *net, |
3004 | const struct sctp_endpoint *ep, | |
3005 | const struct sctp_association *asoc, | |
3006 | const union sctp_subtype type, | |
3007 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 3008 | { |
1da177e4 | 3009 | struct sctp_chunk *chunk = arg; |
1fb6d83b | 3010 | struct sctp_ecnehdr *ecne; |
1da177e4 LT |
3011 | |
3012 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3013 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3014 | |
b515fd27 | 3015 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 3016 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3017 | commands); |
3018 | ||
1fb6d83b XL |
3019 | ecne = (struct sctp_ecnehdr *)chunk->skb->data; |
3020 | skb_pull(chunk->skb, sizeof(*ecne)); | |
1da177e4 LT |
3021 | |
3022 | /* If this is a newer ECNE than the last CWR packet we sent out */ | |
3023 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_ECNE, | |
3024 | SCTP_U32(ntohl(ecne->lowest_tsn))); | |
3025 | ||
3026 | return SCTP_DISPOSITION_CONSUME; | |
3027 | } | |
3028 | ||
3029 | /* | |
3030 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
3031 | * | |
3032 | * The SCTP endpoint MUST always acknowledge the reception of each valid | |
3033 | * DATA chunk. | |
3034 | * | |
3035 | * The guidelines on delayed acknowledgement algorithm specified in | |
3036 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
3037 | * acknowledgement SHOULD be generated for at least every second packet | |
3038 | * (not every second DATA chunk) received, and SHOULD be generated within | |
3039 | * 200 ms of the arrival of any unacknowledged DATA chunk. In some | |
3040 | * situations it may be beneficial for an SCTP transmitter to be more | |
3041 | * conservative than the algorithms detailed in this document allow. | |
3042 | * However, an SCTP transmitter MUST NOT be more aggressive than the | |
3043 | * following algorithms allow. | |
3044 | * | |
3045 | * A SCTP receiver MUST NOT generate more than one SACK for every | |
3046 | * incoming packet, other than to update the offered window as the | |
3047 | * receiving application consumes new data. | |
3048 | * | |
3049 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3050 | * | |
3051 | * Inputs | |
3052 | * (endpoint, asoc, chunk) | |
3053 | * | |
3054 | * Outputs | |
3055 | * (asoc, reply_msg, msg_up, timers, counters) | |
3056 | * | |
3057 | * The return value is the disposition of the chunk. | |
3058 | */ | |
172a1599 XL |
3059 | enum sctp_disposition sctp_sf_eat_data_6_2(struct net *net, |
3060 | const struct sctp_endpoint *ep, | |
3061 | const struct sctp_association *asoc, | |
3062 | const union sctp_subtype type, | |
3063 | void *arg, | |
3064 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3065 | { |
c488b770 | 3066 | union sctp_arg force = SCTP_NOFORCE(); |
1da177e4 LT |
3067 | struct sctp_chunk *chunk = arg; |
3068 | int error; | |
3069 | ||
3070 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3071 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3072 | SCTP_NULL()); | |
24cb81a6 | 3073 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3074 | } |
1da177e4 | 3075 | |
9d4ceaf1 | 3076 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3077 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3078 | commands); |
3079 | ||
cb3f837b | 3080 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3081 | switch (error) { |
3082 | case SCTP_IERROR_NO_ERROR: | |
3083 | break; | |
3084 | case SCTP_IERROR_HIGH_TSN: | |
3085 | case SCTP_IERROR_BAD_STREAM: | |
24cb81a6 | 3086 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3087 | goto discard_noforce; |
3088 | case SCTP_IERROR_DUP_TSN: | |
3089 | case SCTP_IERROR_IGNORE_TSN: | |
24cb81a6 | 3090 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3091 | goto discard_force; |
3092 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3093 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3094 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3095 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3096 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3097 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3098 | default: |
3099 | BUG(); | |
3100 | } | |
3101 | ||
6dc7694f WY |
3102 | if (chunk->chunk_hdr->flags & SCTP_DATA_SACK_IMM) |
3103 | force = SCTP_FORCE(); | |
3104 | ||
9f70f46b | 3105 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
3106 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
3107 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
3108 | } | |
3109 | ||
3110 | /* If this is the last chunk in a packet, we need to count it | |
3111 | * toward sack generation. Note that we need to SACK every | |
3112 | * OTHER packet containing data chunks, EVEN IF WE DISCARD | |
3113 | * THEM. We elect to NOT generate SACK's if the chunk fails | |
3114 | * the verification tag test. | |
3115 | * | |
3116 | * RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3117 | * | |
3118 | * The SCTP endpoint MUST always acknowledge the reception of | |
3119 | * each valid DATA chunk. | |
3120 | * | |
3121 | * The guidelines on delayed acknowledgement algorithm | |
3122 | * specified in Section 4.2 of [RFC2581] SHOULD be followed. | |
3123 | * Specifically, an acknowledgement SHOULD be generated for at | |
3124 | * least every second packet (not every second DATA chunk) | |
3125 | * received, and SHOULD be generated within 200 ms of the | |
3126 | * arrival of any unacknowledged DATA chunk. In some | |
3127 | * situations it may be beneficial for an SCTP transmitter to | |
3128 | * be more conservative than the algorithms detailed in this | |
3129 | * document allow. However, an SCTP transmitter MUST NOT be | |
3130 | * more aggressive than the following algorithms allow. | |
3131 | */ | |
52ccb8e9 | 3132 | if (chunk->end_of_packet) |
6dc7694f | 3133 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3134 | |
1da177e4 LT |
3135 | return SCTP_DISPOSITION_CONSUME; |
3136 | ||
3137 | discard_force: | |
3138 | /* RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3139 | * | |
3140 | * When a packet arrives with duplicate DATA chunk(s) and with | |
3141 | * no new DATA chunk(s), the endpoint MUST immediately send a | |
3142 | * SACK with no delay. If a packet arrives with duplicate | |
3143 | * DATA chunk(s) bundled with new DATA chunks, the endpoint | |
3144 | * MAY immediately send a SACK. Normally receipt of duplicate | |
3145 | * DATA chunks will occur when the original SACK chunk was lost | |
3146 | * and the peer's RTO has expired. The duplicate TSN number(s) | |
3147 | * SHOULD be reported in the SACK as duplicate. | |
3148 | */ | |
3149 | /* In our case, we split the MAY SACK advice up whether or not | |
3150 | * the last chunk is a duplicate.' | |
3151 | */ | |
3152 | if (chunk->end_of_packet) | |
3153 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3154 | return SCTP_DISPOSITION_DISCARD; | |
3155 | ||
3156 | discard_noforce: | |
52ccb8e9 | 3157 | if (chunk->end_of_packet) |
6dc7694f | 3158 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3159 | |
1da177e4 | 3160 | return SCTP_DISPOSITION_DISCARD; |
1da177e4 LT |
3161 | } |
3162 | ||
3163 | /* | |
3164 | * sctp_sf_eat_data_fast_4_4 | |
3165 | * | |
3166 | * Section: 4 (4) | |
3167 | * (4) In SHUTDOWN-SENT state the endpoint MUST acknowledge any received | |
3168 | * DATA chunks without delay. | |
3169 | * | |
3170 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3171 | * Inputs | |
3172 | * (endpoint, asoc, chunk) | |
3173 | * | |
3174 | * Outputs | |
3175 | * (asoc, reply_msg, msg_up, timers, counters) | |
3176 | * | |
3177 | * The return value is the disposition of the chunk. | |
3178 | */ | |
172a1599 XL |
3179 | enum sctp_disposition sctp_sf_eat_data_fast_4_4( |
3180 | struct net *net, | |
3181 | const struct sctp_endpoint *ep, | |
3182 | const struct sctp_association *asoc, | |
3183 | const union sctp_subtype type, | |
3184 | void *arg, | |
3185 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3186 | { |
3187 | struct sctp_chunk *chunk = arg; | |
3188 | int error; | |
3189 | ||
3190 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3191 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3192 | SCTP_NULL()); | |
24cb81a6 | 3193 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3194 | } |
3195 | ||
9d4ceaf1 | 3196 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3197 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3198 | commands); |
3199 | ||
cb3f837b | 3200 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3201 | switch (error) { |
3202 | case SCTP_IERROR_NO_ERROR: | |
3203 | case SCTP_IERROR_HIGH_TSN: | |
3204 | case SCTP_IERROR_DUP_TSN: | |
3205 | case SCTP_IERROR_IGNORE_TSN: | |
3206 | case SCTP_IERROR_BAD_STREAM: | |
3207 | break; | |
3208 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3209 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3210 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3211 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3212 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3213 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3214 | default: |
3215 | BUG(); | |
3216 | } | |
3217 | ||
3218 | /* Go a head and force a SACK, since we are shutting down. */ | |
3219 | ||
3220 | /* Implementor's Guide. | |
3221 | * | |
3222 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
3223 | * respond to each received packet containing one or more DATA chunk(s) | |
3224 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
3225 | */ | |
3226 | if (chunk->end_of_packet) { | |
3227 | /* We must delay the chunk creation since the cumulative | |
3228 | * TSN has not been updated yet. | |
3229 | */ | |
3230 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
3231 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3232 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
3233 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3234 | } | |
3235 | ||
1da177e4 LT |
3236 | return SCTP_DISPOSITION_CONSUME; |
3237 | } | |
3238 | ||
3239 | /* | |
3240 | * Section: 6.2 Processing a Received SACK | |
3241 | * D) Any time a SACK arrives, the endpoint performs the following: | |
3242 | * | |
3243 | * i) If Cumulative TSN Ack is less than the Cumulative TSN Ack Point, | |
3244 | * then drop the SACK. Since Cumulative TSN Ack is monotonically | |
3245 | * increasing, a SACK whose Cumulative TSN Ack is less than the | |
3246 | * Cumulative TSN Ack Point indicates an out-of-order SACK. | |
3247 | * | |
3248 | * ii) Set rwnd equal to the newly received a_rwnd minus the number | |
3249 | * of bytes still outstanding after processing the Cumulative TSN Ack | |
3250 | * and the Gap Ack Blocks. | |
3251 | * | |
3252 | * iii) If the SACK is missing a TSN that was previously | |
3253 | * acknowledged via a Gap Ack Block (e.g., the data receiver | |
3254 | * reneged on the data), then mark the corresponding DATA chunk | |
3255 | * as available for retransmit: Mark it as missing for fast | |
3256 | * retransmit as described in Section 7.2.4 and if no retransmit | |
3257 | * timer is running for the destination address to which the DATA | |
3258 | * chunk was originally transmitted, then T3-rtx is started for | |
3259 | * that destination address. | |
3260 | * | |
3261 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3262 | * | |
3263 | * Inputs | |
3264 | * (endpoint, asoc, chunk) | |
3265 | * | |
3266 | * Outputs | |
3267 | * (asoc, reply_msg, msg_up, timers, counters) | |
3268 | * | |
3269 | * The return value is the disposition of the chunk. | |
3270 | */ | |
172a1599 XL |
3271 | enum sctp_disposition sctp_sf_eat_sack_6_2(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; | |
78731085 | 3279 | struct sctp_sackhdr *sackh; |
1da177e4 LT |
3280 | __u32 ctsn; |
3281 | ||
103d750c MH |
3282 | trace_sctp_probe(ep, asoc, chunk); |
3283 | ||
1da177e4 | 3284 | if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6 | 3285 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3286 | |
3287 | /* Make sure that the SACK chunk has a valid length. */ | |
d4d6c614 | 3288 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_sack_chunk))) |
24cb81a6 | 3289 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3290 | commands); |
3291 | ||
3292 | /* Pull the SACK chunk from the data buffer */ | |
3293 | sackh = sctp_sm_pull_sack(chunk); | |
3294 | /* Was this a bogus SACK? */ | |
3295 | if (!sackh) | |
24cb81a6 | 3296 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3297 | chunk->subh.sack_hdr = sackh; |
3298 | ctsn = ntohl(sackh->cum_tsn_ack); | |
3299 | ||
3300 | /* i) If Cumulative TSN Ack is less than the Cumulative TSN | |
3301 | * Ack Point, then drop the SACK. Since Cumulative TSN | |
3302 | * Ack is monotonically increasing, a SACK whose | |
3303 | * Cumulative TSN Ack is less than the Cumulative TSN Ack | |
3304 | * Point indicates an out-of-order SACK. | |
3305 | */ | |
3306 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
3307 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
3308 | asoc->ctsn_ack_point); | |
3309 | ||
1da177e4 LT |
3310 | return SCTP_DISPOSITION_DISCARD; |
3311 | } | |
3312 | ||
aecedeab WY |
3313 | /* If Cumulative TSN Ack beyond the max tsn currently |
3314 | * send, terminating the association and respond to the | |
3315 | * sender with an ABORT. | |
3316 | */ | |
3317 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 3318 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
aecedeab | 3319 | |
1da177e4 | 3320 | /* Return this SACK for further processing. */ |
edfee033 | 3321 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk)); |
1da177e4 LT |
3322 | |
3323 | /* Note: We do the rest of the work on the PROCESS_SACK | |
3324 | * sideeffect. | |
3325 | */ | |
3326 | return SCTP_DISPOSITION_CONSUME; | |
3327 | } | |
3328 | ||
3329 | /* | |
3330 | * Generate an ABORT in response to a packet. | |
3331 | * | |
047a2428 | 3332 | * Section: 8.4 Handle "Out of the blue" Packets, sctpimpguide 2.41 |
1da177e4 | 3333 | * |
047a2428 JF |
3334 | * 8) The receiver should respond to the sender of the OOTB packet with |
3335 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3336 | * MUST fill in the Verification Tag field of the outbound packet | |
3337 | * with the value found in the Verification Tag field of the OOTB | |
3338 | * packet and set the T-bit in the Chunk Flags to indicate that the | |
3339 | * Verification Tag is reflected. After sending this ABORT, the | |
3340 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3341 | * no further action. | |
1da177e4 LT |
3342 | * |
3343 | * Verification Tag: | |
3344 | * | |
3345 | * The return value is the disposition of the chunk. | |
3346 | */ | |
172a1599 XL |
3347 | static enum sctp_disposition sctp_sf_tabort_8_4_8( |
3348 | struct net *net, | |
24cb81a6 | 3349 | const struct sctp_endpoint *ep, |
1da177e4 | 3350 | const struct sctp_association *asoc, |
bfc6f827 | 3351 | const union sctp_subtype type, |
1da177e4 | 3352 | void *arg, |
a85bbeb2 | 3353 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
3354 | { |
3355 | struct sctp_packet *packet = NULL; | |
3356 | struct sctp_chunk *chunk = arg; | |
3357 | struct sctp_chunk *abort; | |
3358 | ||
2ce95503 | 3359 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
eab59075 MRL |
3360 | if (!packet) |
3361 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3362 | |
eab59075 MRL |
3363 | /* Make an ABORT. The T bit will be set if the asoc |
3364 | * is NULL. | |
3365 | */ | |
3366 | abort = sctp_make_abort(asoc, chunk, 0); | |
3367 | if (!abort) { | |
3368 | sctp_ootb_pkt_free(packet); | |
3369 | return SCTP_DISPOSITION_NOMEM; | |
3370 | } | |
047a2428 | 3371 | |
eab59075 MRL |
3372 | /* Reflect vtag if T-Bit is set */ |
3373 | if (sctp_test_T_bit(abort)) | |
3374 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3375 | |
eab59075 MRL |
3376 | /* Set the skb to the belonging sock for accounting. */ |
3377 | abort->skb->sk = ep->base.sk; | |
1da177e4 | 3378 | |
eab59075 | 3379 | sctp_packet_append_chunk(packet, abort); |
1da177e4 | 3380 | |
eab59075 MRL |
3381 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3382 | SCTP_PACKET(packet)); | |
1da177e4 | 3383 | |
eab59075 | 3384 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3385 | |
eab59075 MRL |
3386 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3387 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
3388 | } |
3389 | ||
3390 | /* | |
3391 | * Received an ERROR chunk from peer. Generate SCTP_REMOTE_ERROR | |
3392 | * event as ULP notification for each cause included in the chunk. | |
3393 | * | |
3394 | * API 5.3.1.3 - SCTP_REMOTE_ERROR | |
3395 | * | |
3396 | * The return value is the disposition of the chunk. | |
3397 | */ | |
172a1599 XL |
3398 | enum sctp_disposition sctp_sf_operr_notify(struct net *net, |
3399 | const struct sctp_endpoint *ep, | |
3400 | const struct sctp_association *asoc, | |
3401 | const union sctp_subtype type, | |
3402 | void *arg, | |
3403 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3404 | { |
3405 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 3406 | struct sctp_errhdr *err; |
1da177e4 LT |
3407 | |
3408 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3409 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3410 | |
3411 | /* Make sure that the ERROR chunk has a valid length. */ | |
87caeba7 | 3412 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 3413 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3414 | commands); |
8a00be1c SW |
3415 | sctp_walk_errors(err, chunk->chunk_hdr); |
3416 | if ((void *)err != (void *)chunk->chunk_end) | |
24cb81a6 | 3417 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
8a00be1c | 3418 | (void *)err, commands); |
1da177e4 | 3419 | |
3df26787 WY |
3420 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_OPERR, |
3421 | SCTP_CHUNK(chunk)); | |
1da177e4 | 3422 | |
1da177e4 | 3423 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
3424 | } |
3425 | ||
3426 | /* | |
3427 | * Process an inbound SHUTDOWN ACK. | |
3428 | * | |
3429 | * From Section 9.2: | |
3430 | * Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3431 | * stop the T2-shutdown timer, send a SHUTDOWN COMPLETE chunk to its | |
3432 | * peer, and remove all record of the association. | |
3433 | * | |
3434 | * The return value is the disposition. | |
3435 | */ | |
172a1599 XL |
3436 | enum sctp_disposition sctp_sf_do_9_2_final(struct net *net, |
3437 | const struct sctp_endpoint *ep, | |
3438 | const struct sctp_association *asoc, | |
3439 | const union sctp_subtype type, | |
3440 | void *arg, | |
3441 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3442 | { |
3443 | struct sctp_chunk *chunk = arg; | |
3444 | struct sctp_chunk *reply; | |
3445 | struct sctp_ulpevent *ev; | |
3446 | ||
3447 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3448 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3449 | |
3450 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3451 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3452 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3453 | commands); |
1da177e4 LT |
3454 | /* 10.2 H) SHUTDOWN COMPLETE notification |
3455 | * | |
3456 | * When SCTP completes the shutdown procedures (section 9.2) this | |
3457 | * notification is passed to the upper layer. | |
3458 | */ | |
3459 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 3460 | 0, 0, 0, NULL, GFP_ATOMIC); |
1da177e4 LT |
3461 | if (!ev) |
3462 | goto nomem; | |
3463 | ||
df7deeb5 VY |
3464 | /* ...send a SHUTDOWN COMPLETE chunk to its peer, */ |
3465 | reply = sctp_make_shutdown_complete(asoc, chunk); | |
3466 | if (!reply) | |
3467 | goto nomem_chunk; | |
3468 | ||
3469 | /* Do all the commands now (after allocation), so that we | |
3470 | * have consistent state if memory allocation failes | |
3471 | */ | |
1da177e4 LT |
3472 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
3473 | ||
3474 | /* Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3475 | * stop the T2-shutdown timer, | |
3476 | */ | |
3477 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3478 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3479 | ||
3480 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3481 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
3482 | ||
1da177e4 LT |
3483 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
3484 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
b01a2407 EB |
3485 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
3486 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3487 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); |
3488 | ||
3489 | /* ...and remove all record of the association. */ | |
3490 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
3491 | return SCTP_DISPOSITION_DELETE_TCB; | |
3492 | ||
df7deeb5 VY |
3493 | nomem_chunk: |
3494 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
3495 | nomem: |
3496 | return SCTP_DISPOSITION_NOMEM; | |
3497 | } | |
3498 | ||
3499 | /* | |
047a2428 JF |
3500 | * RFC 2960, 8.4 - Handle "Out of the blue" Packets, sctpimpguide 2.41. |
3501 | * | |
1da177e4 LT |
3502 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
3503 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. | |
3504 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3505 | * packet must fill in the Verification Tag field of the outbound | |
3506 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
047a2428 JF |
3507 | * set the T-bit in the Chunk Flags to indicate that the Verification |
3508 | * Tag is reflected. | |
1da177e4 LT |
3509 | * |
3510 | * 8) The receiver should respond to the sender of the OOTB packet with | |
3511 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3512 | * MUST fill in the Verification Tag field of the outbound packet | |
3513 | * with the value found in the Verification Tag field of the OOTB | |
047a2428 JF |
3514 | * packet and set the T-bit in the Chunk Flags to indicate that the |
3515 | * Verification Tag is reflected. After sending this ABORT, the | |
3516 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3517 | * no further action. | |
1da177e4 | 3518 | */ |
172a1599 XL |
3519 | enum sctp_disposition sctp_sf_ootb(struct net *net, |
3520 | const struct sctp_endpoint *ep, | |
3521 | const struct sctp_association *asoc, | |
3522 | const union sctp_subtype type, | |
3523 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3524 | { |
3525 | struct sctp_chunk *chunk = arg; | |
3526 | struct sk_buff *skb = chunk->skb; | |
922dbc5b | 3527 | struct sctp_chunkhdr *ch; |
d8238d9d | 3528 | struct sctp_errhdr *err; |
85c5ed4e | 3529 | int ootb_cookie_ack = 0; |
172a1599 XL |
3530 | int ootb_shut_ack = 0; |
3531 | __u8 *ch_end; | |
1da177e4 | 3532 | |
b01a2407 | 3533 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
1da177e4 | 3534 | |
922dbc5b | 3535 | ch = (struct sctp_chunkhdr *)chunk->chunk_hdr; |
1da177e4 | 3536 | do { |
ece25dfa | 3537 | /* Report violation if the chunk is less then minimal */ |
922dbc5b | 3538 | if (ntohs(ch->length) < sizeof(*ch)) |
24cb81a6 | 3539 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 3540 | commands); |
1da177e4 | 3541 | |
bf911e98 MRL |
3542 | /* Report violation if chunk len overflows */ |
3543 | ch_end = ((__u8 *)ch) + SCTP_PAD4(ntohs(ch->length)); | |
3544 | if (ch_end > skb_tail_pointer(skb)) | |
3545 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3546 | commands); | |
3547 | ||
ece25dfa VY |
3548 | /* Now that we know we at least have a chunk header, |
3549 | * do things that are type appropriate. | |
3550 | */ | |
1da177e4 LT |
3551 | if (SCTP_CID_SHUTDOWN_ACK == ch->type) |
3552 | ootb_shut_ack = 1; | |
3553 | ||
3554 | /* RFC 2960, Section 3.3.7 | |
3555 | * Moreover, under any circumstances, an endpoint that | |
3556 | * receives an ABORT MUST NOT respond to that ABORT by | |
3557 | * sending an ABORT of its own. | |
3558 | */ | |
3559 | if (SCTP_CID_ABORT == ch->type) | |
24cb81a6 | 3560 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3561 | |
85c5ed4e SW |
3562 | /* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR |
3563 | * or a COOKIE ACK the SCTP Packet should be silently | |
3564 | * discarded. | |
3565 | */ | |
3566 | ||
3567 | if (SCTP_CID_COOKIE_ACK == ch->type) | |
3568 | ootb_cookie_ack = 1; | |
3569 | ||
3570 | if (SCTP_CID_ERROR == ch->type) { | |
3571 | sctp_walk_errors(err, ch) { | |
3572 | if (SCTP_ERROR_STALE_COOKIE == err->cause) { | |
3573 | ootb_cookie_ack = 1; | |
3574 | break; | |
3575 | } | |
3576 | } | |
3577 | } | |
3578 | ||
922dbc5b | 3579 | ch = (struct sctp_chunkhdr *)ch_end; |
27a884dc | 3580 | } while (ch_end < skb_tail_pointer(skb)); |
1da177e4 LT |
3581 | |
3582 | if (ootb_shut_ack) | |
24cb81a6 | 3583 | return sctp_sf_shut_8_4_5(net, ep, asoc, type, arg, commands); |
85c5ed4e | 3584 | else if (ootb_cookie_ack) |
24cb81a6 | 3585 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3586 | else |
24cb81a6 | 3587 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3588 | } |
3589 | ||
3590 | /* | |
3591 | * Handle an "Out of the blue" SHUTDOWN ACK. | |
3592 | * | |
047a2428 JF |
3593 | * Section: 8.4 5, sctpimpguide 2.41. |
3594 | * | |
1da177e4 | 3595 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
047a2428 JF |
3596 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. |
3597 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3598 | * packet must fill in the Verification Tag field of the outbound | |
3599 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
3600 | * set the T-bit in the Chunk Flags to indicate that the Verification | |
3601 | * Tag is reflected. | |
1da177e4 LT |
3602 | * |
3603 | * Inputs | |
3604 | * (endpoint, asoc, type, arg, commands) | |
3605 | * | |
3606 | * Outputs | |
172a1599 | 3607 | * (enum sctp_disposition) |
1da177e4 LT |
3608 | * |
3609 | * The return value is the disposition of the chunk. | |
3610 | */ | |
172a1599 XL |
3611 | static enum sctp_disposition sctp_sf_shut_8_4_5( |
3612 | struct net *net, | |
3613 | const struct sctp_endpoint *ep, | |
3614 | const struct sctp_association *asoc, | |
3615 | const union sctp_subtype type, | |
3616 | void *arg, | |
3617 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3618 | { |
3619 | struct sctp_packet *packet = NULL; | |
3620 | struct sctp_chunk *chunk = arg; | |
3621 | struct sctp_chunk *shut; | |
3622 | ||
2ce95503 | 3623 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1ff01561 MRL |
3624 | if (!packet) |
3625 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3626 | |
1ff01561 MRL |
3627 | /* Make an SHUTDOWN_COMPLETE. |
3628 | * The T bit will be set if the asoc is NULL. | |
3629 | */ | |
3630 | shut = sctp_make_shutdown_complete(asoc, chunk); | |
3631 | if (!shut) { | |
3632 | sctp_ootb_pkt_free(packet); | |
3633 | return SCTP_DISPOSITION_NOMEM; | |
3634 | } | |
047a2428 | 3635 | |
1ff01561 MRL |
3636 | /* Reflect vtag if T-Bit is set */ |
3637 | if (sctp_test_T_bit(shut)) | |
3638 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3639 | |
1ff01561 MRL |
3640 | /* Set the skb to the belonging sock for accounting. */ |
3641 | shut->skb->sk = ep->base.sk; | |
1da177e4 | 3642 | |
1ff01561 | 3643 | sctp_packet_append_chunk(packet, shut); |
1da177e4 | 3644 | |
1ff01561 MRL |
3645 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3646 | SCTP_PACKET(packet)); | |
1da177e4 | 3647 | |
1ff01561 | 3648 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3649 | |
1ff01561 MRL |
3650 | /* If the chunk length is invalid, we don't want to process |
3651 | * the reset of the packet. | |
3652 | */ | |
922dbc5b | 3653 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3654 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3655 | |
1ff01561 MRL |
3656 | /* We need to discard the rest of the packet to prevent |
3657 | * potential bomming attacks from additional bundled chunks. | |
3658 | * This is documented in SCTP Threats ID. | |
3659 | */ | |
3660 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1da177e4 LT |
3661 | } |
3662 | ||
3663 | /* | |
3664 | * Handle SHUTDOWN ACK in COOKIE_ECHOED or COOKIE_WAIT state. | |
3665 | * | |
3666 | * Verification Tag: 8.5.1 E) Rules for packet carrying a SHUTDOWN ACK | |
3667 | * If the receiver is in COOKIE-ECHOED or COOKIE-WAIT state the | |
3668 | * procedures in section 8.4 SHOULD be followed, in other words it | |
3669 | * should be treated as an Out Of The Blue packet. | |
3670 | * [This means that we do NOT check the Verification Tag on these | |
3671 | * chunks. --piggy ] | |
3672 | * | |
3673 | */ | |
172a1599 XL |
3674 | enum sctp_disposition sctp_sf_do_8_5_1_E_sa(struct net *net, |
3675 | const struct sctp_endpoint *ep, | |
3676 | const struct sctp_association *asoc, | |
3677 | const union sctp_subtype type, | |
3678 | void *arg, | |
3679 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3680 | { |
ece25dfa VY |
3681 | struct sctp_chunk *chunk = arg; |
3682 | ||
3683 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3684 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3685 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
3686 | commands); |
3687 | ||
1da177e4 LT |
3688 | /* Although we do have an association in this case, it corresponds |
3689 | * to a restarted association. So the packet is treated as an OOTB | |
3690 | * packet and the state function that handles OOTB SHUTDOWN_ACK is | |
3691 | * called with a NULL association. | |
3692 | */ | |
24cb81a6 | 3693 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
8190f89d | 3694 | |
24cb81a6 | 3695 | return sctp_sf_shut_8_4_5(net, ep, NULL, type, arg, commands); |
1da177e4 LT |
3696 | } |
3697 | ||
3698 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. */ | |
172a1599 XL |
3699 | enum sctp_disposition sctp_sf_do_asconf(struct net *net, |
3700 | const struct sctp_endpoint *ep, | |
3701 | const struct sctp_association *asoc, | |
3702 | const union sctp_subtype type, | |
3703 | void *arg, | |
3704 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3705 | { |
172a1599 XL |
3706 | struct sctp_paramhdr *err_param = NULL; |
3707 | struct sctp_chunk *asconf_ack = NULL; | |
3708 | struct sctp_chunk *chunk = arg; | |
3709 | struct sctp_addiphdr *hdr; | |
3710 | __u32 serial; | |
1da177e4 LT |
3711 | |
3712 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3713 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3714 | SCTP_NULL()); | |
24cb81a6 | 3715 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3716 | } |
3717 | ||
6afd2e83 VY |
3718 | /* ADD-IP: Section 4.1.1 |
3719 | * This chunk MUST be sent in an authenticated way by using | |
3720 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3721 | * is received unauthenticated it MUST be silently discarded as | |
3722 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3723 | */ | |
a2eeacc8 XL |
3724 | if (!asoc->peer.asconf_capable || |
3725 | (!net->sctp.addip_noauth && !chunk->auth)) | |
68d75469 XL |
3726 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
3727 | commands); | |
6afd2e83 | 3728 | |
1da177e4 | 3729 | /* Make sure that the ASCONF ADDIP chunk has a valid length. */ |
68d75469 | 3730 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_addip_chunk))) |
24cb81a6 | 3731 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3732 | commands); |
3733 | ||
65205cc4 | 3734 | hdr = (struct sctp_addiphdr *)chunk->skb->data; |
1da177e4 LT |
3735 | serial = ntohl(hdr->serial); |
3736 | ||
6f4c618d | 3737 | /* Verify the ASCONF chunk before processing it. */ |
9de7922b | 3738 | if (!sctp_verify_asconf(asoc, chunk, true, &err_param)) |
24cb81a6 | 3739 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3740 | (void *)err_param, commands); |
6f4c618d | 3741 | |
a08de64d | 3742 | /* ADDIP 5.2 E1) Compare the value of the serial number to the value |
1da177e4 | 3743 | * the endpoint stored in a new association variable |
d808ad9a | 3744 | * 'Peer-Serial-Number'. |
1da177e4 LT |
3745 | */ |
3746 | if (serial == asoc->peer.addip_serial + 1) { | |
a08de64d VY |
3747 | /* If this is the first instance of ASCONF in the packet, |
3748 | * we can clean our old ASCONF-ACKs. | |
3749 | */ | |
3750 | if (!chunk->has_asconf) | |
3751 | sctp_assoc_clean_asconf_ack_cache(asoc); | |
3752 | ||
3753 | /* ADDIP 5.2 E4) When the Sequence Number matches the next one | |
3754 | * expected, process the ASCONF as described below and after | |
3755 | * processing the ASCONF Chunk, append an ASCONF-ACK Chunk to | |
3756 | * the response packet and cache a copy of it (in the event it | |
3757 | * later needs to be retransmitted). | |
3758 | * | |
3759 | * Essentially, do V1-V5. | |
1da177e4 LT |
3760 | */ |
3761 | asconf_ack = sctp_process_asconf((struct sctp_association *) | |
3762 | asoc, chunk); | |
3763 | if (!asconf_ack) | |
3764 | return SCTP_DISPOSITION_NOMEM; | |
a08de64d VY |
3765 | } else if (serial < asoc->peer.addip_serial + 1) { |
3766 | /* ADDIP 5.2 E2) | |
3767 | * If the value found in the Sequence Number is less than the | |
3768 | * ('Peer- Sequence-Number' + 1), simply skip to the next | |
3769 | * ASCONF, and include in the outbound response packet | |
3770 | * any previously cached ASCONF-ACK response that was | |
3771 | * sent and saved that matches the Sequence Number of the | |
3772 | * ASCONF. Note: It is possible that no cached ASCONF-ACK | |
3773 | * Chunk exists. This will occur when an older ASCONF | |
3774 | * arrives out of order. In such a case, the receiver | |
3775 | * should skip the ASCONF Chunk and not include ASCONF-ACK | |
3776 | * Chunk for that chunk. | |
1da177e4 | 3777 | */ |
a08de64d VY |
3778 | asconf_ack = sctp_assoc_lookup_asconf_ack(asoc, hdr->serial); |
3779 | if (!asconf_ack) | |
1da177e4 | 3780 | return SCTP_DISPOSITION_DISCARD; |
31b02e15 VY |
3781 | |
3782 | /* Reset the transport so that we select the correct one | |
3783 | * this time around. This is to make sure that we don't | |
3784 | * accidentally use a stale transport that's been removed. | |
3785 | */ | |
3786 | asconf_ack->transport = NULL; | |
1da177e4 | 3787 | } else { |
a08de64d | 3788 | /* ADDIP 5.2 E5) Otherwise, the ASCONF Chunk is discarded since |
1da177e4 | 3789 | * it must be either a stale packet or from an attacker. |
d808ad9a | 3790 | */ |
1da177e4 LT |
3791 | return SCTP_DISPOSITION_DISCARD; |
3792 | } | |
3793 | ||
a08de64d VY |
3794 | /* ADDIP 5.2 E6) The destination address of the SCTP packet |
3795 | * containing the ASCONF-ACK Chunks MUST be the source address of | |
3796 | * the SCTP packet that held the ASCONF Chunks. | |
3797 | * | |
3798 | * To do this properly, we'll set the destination address of the chunk | |
3799 | * and at the transmit time, will try look up the transport to use. | |
3800 | * Since ASCONFs may be bundled, the correct transport may not be | |
94e2bd68 | 3801 | * created until we process the entire packet, thus this workaround. |
1da177e4 | 3802 | */ |
a08de64d | 3803 | asconf_ack->dest = chunk->source; |
1da177e4 | 3804 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asconf_ack)); |
6af29ccc | 3805 | if (asoc->new_transport) { |
f7010e61 | 3806 | sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport, commands); |
6af29ccc MH |
3807 | ((struct sctp_association *)asoc)->new_transport = NULL; |
3808 | } | |
d808ad9a | 3809 | |
1da177e4 LT |
3810 | return SCTP_DISPOSITION_CONSUME; |
3811 | } | |
3812 | ||
fbd01973 XL |
3813 | static enum sctp_disposition sctp_send_next_asconf( |
3814 | struct net *net, | |
3815 | const struct sctp_endpoint *ep, | |
3816 | struct sctp_association *asoc, | |
3817 | const union sctp_subtype type, | |
3818 | struct sctp_cmd_seq *commands) | |
3819 | { | |
3820 | struct sctp_chunk *asconf; | |
3821 | struct list_head *entry; | |
3822 | ||
3823 | if (list_empty(&asoc->addip_chunk_list)) | |
3824 | return SCTP_DISPOSITION_CONSUME; | |
3825 | ||
3826 | entry = asoc->addip_chunk_list.next; | |
3827 | asconf = list_entry(entry, struct sctp_chunk, list); | |
3828 | ||
3829 | list_del_init(entry); | |
3830 | sctp_chunk_hold(asconf); | |
3831 | asoc->addip_last_asconf = asconf; | |
3832 | ||
3833 | return sctp_sf_do_prm_asconf(net, ep, asoc, type, asconf, commands); | |
3834 | } | |
3835 | ||
1da177e4 LT |
3836 | /* |
3837 | * ADDIP Section 4.3 General rules for address manipulation | |
3838 | * When building TLV parameters for the ASCONF Chunk that will add or | |
3839 | * delete IP addresses the D0 to D13 rules should be applied: | |
3840 | */ | |
172a1599 XL |
3841 | enum sctp_disposition sctp_sf_do_asconf_ack(struct net *net, |
3842 | const struct sctp_endpoint *ep, | |
3843 | const struct sctp_association *asoc, | |
3844 | const union sctp_subtype type, | |
3845 | void *arg, | |
3846 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3847 | { |
172a1599 XL |
3848 | struct sctp_chunk *last_asconf = asoc->addip_last_asconf; |
3849 | struct sctp_paramhdr *err_param = NULL; | |
3850 | struct sctp_chunk *asconf_ack = arg; | |
3851 | struct sctp_addiphdr *addip_hdr; | |
3852 | __u32 sent_serial, rcvd_serial; | |
3853 | struct sctp_chunk *abort; | |
1da177e4 LT |
3854 | |
3855 | if (!sctp_vtag_verify(asconf_ack, asoc)) { | |
3856 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3857 | SCTP_NULL()); | |
24cb81a6 | 3858 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3859 | } |
3860 | ||
6afd2e83 VY |
3861 | /* ADD-IP, Section 4.1.2: |
3862 | * This chunk MUST be sent in an authenticated way by using | |
3863 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3864 | * is received unauthenticated it MUST be silently discarded as | |
3865 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3866 | */ | |
a2eeacc8 XL |
3867 | if (!asoc->peer.asconf_capable || |
3868 | (!net->sctp.addip_noauth && !asconf_ack->auth)) | |
68d75469 XL |
3869 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
3870 | commands); | |
6afd2e83 | 3871 | |
1da177e4 | 3872 | /* Make sure that the ADDIP chunk has a valid length. */ |
68d75469 XL |
3873 | if (!sctp_chunk_length_valid(asconf_ack, |
3874 | sizeof(struct sctp_addip_chunk))) | |
24cb81a6 | 3875 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3876 | commands); |
3877 | ||
65205cc4 | 3878 | addip_hdr = (struct sctp_addiphdr *)asconf_ack->skb->data; |
1da177e4 LT |
3879 | rcvd_serial = ntohl(addip_hdr->serial); |
3880 | ||
6f4c618d | 3881 | /* Verify the ASCONF-ACK chunk before processing it. */ |
9de7922b | 3882 | if (!sctp_verify_asconf(asoc, asconf_ack, false, &err_param)) |
24cb81a6 | 3883 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3884 | (void *)err_param, commands); |
6f4c618d | 3885 | |
1da177e4 | 3886 | if (last_asconf) { |
65205cc4 | 3887 | addip_hdr = (struct sctp_addiphdr *)last_asconf->subh.addip_hdr; |
1da177e4 LT |
3888 | sent_serial = ntohl(addip_hdr->serial); |
3889 | } else { | |
3890 | sent_serial = asoc->addip_serial - 1; | |
3891 | } | |
3892 | ||
3893 | /* D0) If an endpoint receives an ASCONF-ACK that is greater than or | |
3894 | * equal to the next serial number to be used but no ASCONF chunk is | |
3895 | * outstanding the endpoint MUST ABORT the association. Note that a | |
3896 | * sequence number is greater than if it is no more than 2^^31-1 | |
3897 | * larger than the current sequence number (using serial arithmetic). | |
3898 | */ | |
3899 | if (ADDIP_SERIAL_gte(rcvd_serial, sent_serial + 1) && | |
3900 | !(asoc->addip_last_asconf)) { | |
3901 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3902 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3903 | if (abort) { |
00f1c2df | 3904 | sctp_init_cause(abort, SCTP_ERROR_ASCONF_ACK, 0); |
1da177e4 LT |
3905 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3906 | SCTP_CHUNK(abort)); | |
3907 | } | |
3908 | /* We are going to ABORT, so we might as well stop | |
3909 | * processing the rest of the chunks in the packet. | |
3910 | */ | |
3911 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3912 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
cb3f837b | 3913 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3914 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 3915 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 3916 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 3917 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
3918 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
3919 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3920 | return SCTP_DISPOSITION_ABORT; |
3921 | } | |
3922 | ||
3923 | if ((rcvd_serial == sent_serial) && asoc->addip_last_asconf) { | |
3924 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3925 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
3926 | ||
3927 | if (!sctp_process_asconf_ack((struct sctp_association *)asoc, | |
fbd01973 XL |
3928 | asconf_ack)) |
3929 | return sctp_send_next_asconf(net, ep, | |
3930 | (struct sctp_association *)asoc, | |
3931 | type, commands); | |
1da177e4 LT |
3932 | |
3933 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3934 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3935 | if (abort) { |
00f1c2df | 3936 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); |
1da177e4 LT |
3937 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3938 | SCTP_CHUNK(abort)); | |
3939 | } | |
3940 | /* We are going to ABORT, so we might as well stop | |
3941 | * processing the rest of the chunks in the packet. | |
3942 | */ | |
cb3f837b | 3943 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3944 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 3945 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 3946 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 3947 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
3948 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
3949 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3950 | return SCTP_DISPOSITION_ABORT; |
3951 | } | |
3952 | ||
3953 | return SCTP_DISPOSITION_DISCARD; | |
3954 | } | |
3955 | ||
2040d3d7 | 3956 | /* RE-CONFIG Section 5.2 Upon reception of an RECONF Chunk. */ |
172a1599 XL |
3957 | enum sctp_disposition sctp_sf_do_reconf(struct net *net, |
3958 | const struct sctp_endpoint *ep, | |
3959 | const struct sctp_association *asoc, | |
3960 | const union sctp_subtype type, | |
3961 | void *arg, | |
3962 | struct sctp_cmd_seq *commands) | |
2040d3d7 XL |
3963 | { |
3964 | struct sctp_paramhdr *err_param = NULL; | |
3965 | struct sctp_chunk *chunk = arg; | |
3966 | struct sctp_reconf_chunk *hdr; | |
3967 | union sctp_params param; | |
3968 | ||
3969 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3970 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3971 | SCTP_NULL()); | |
3972 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
3973 | } | |
3974 | ||
3975 | /* Make sure that the RECONF chunk has a valid length. */ | |
3976 | if (!sctp_chunk_length_valid(chunk, sizeof(*hdr))) | |
3977 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3978 | commands); | |
3979 | ||
3980 | if (!sctp_verify_reconf(asoc, chunk, &err_param)) | |
3981 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
3982 | (void *)err_param, commands); | |
3983 | ||
3984 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
3985 | sctp_walk_params(param, hdr, params) { | |
3986 | struct sctp_chunk *reply = NULL; | |
3987 | struct sctp_ulpevent *ev = NULL; | |
3988 | ||
3989 | if (param.p->type == SCTP_PARAM_RESET_OUT_REQUEST) | |
3990 | reply = sctp_process_strreset_outreq( | |
3991 | (struct sctp_association *)asoc, param, &ev); | |
3992 | else if (param.p->type == SCTP_PARAM_RESET_IN_REQUEST) | |
3993 | reply = sctp_process_strreset_inreq( | |
3994 | (struct sctp_association *)asoc, param, &ev); | |
692787ce XL |
3995 | else if (param.p->type == SCTP_PARAM_RESET_TSN_REQUEST) |
3996 | reply = sctp_process_strreset_tsnreq( | |
3997 | (struct sctp_association *)asoc, param, &ev); | |
50a41591 XL |
3998 | else if (param.p->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) |
3999 | reply = sctp_process_strreset_addstrm_out( | |
4000 | (struct sctp_association *)asoc, param, &ev); | |
c5c4ebb3 XL |
4001 | else if (param.p->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) |
4002 | reply = sctp_process_strreset_addstrm_in( | |
4003 | (struct sctp_association *)asoc, param, &ev); | |
11ae76e6 XL |
4004 | else if (param.p->type == SCTP_PARAM_RESET_RESPONSE) |
4005 | reply = sctp_process_strreset_resp( | |
4006 | (struct sctp_association *)asoc, param, &ev); | |
2040d3d7 XL |
4007 | |
4008 | if (ev) | |
4009 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
4010 | SCTP_ULPEVENT(ev)); | |
4011 | ||
4012 | if (reply) | |
4013 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4014 | SCTP_CHUNK(reply)); | |
4015 | } | |
4016 | ||
4017 | return SCTP_DISPOSITION_CONSUME; | |
4018 | } | |
4019 | ||
1da177e4 LT |
4020 | /* |
4021 | * PR-SCTP Section 3.6 Receiver Side Implementation of PR-SCTP | |
4022 | * | |
4023 | * When a FORWARD TSN chunk arrives, the data receiver MUST first update | |
4024 | * its cumulative TSN point to the value carried in the FORWARD TSN | |
4025 | * chunk, and then MUST further advance its cumulative TSN point locally | |
4026 | * if possible. | |
4027 | * After the above processing, the data receiver MUST stop reporting any | |
4028 | * missing TSNs earlier than or equal to the new cumulative TSN point. | |
4029 | * | |
4030 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4031 | * | |
4032 | * The return value is the disposition of the chunk. | |
4033 | */ | |
172a1599 XL |
4034 | enum sctp_disposition sctp_sf_eat_fwd_tsn(struct net *net, |
4035 | const struct sctp_endpoint *ep, | |
4036 | const struct sctp_association *asoc, | |
4037 | const union sctp_subtype type, | |
4038 | void *arg, | |
4039 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4040 | { |
1da177e4 | 4041 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4042 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
4043 | __u16 len; |
4044 | __u32 tsn; | |
4045 | ||
4046 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4047 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4048 | SCTP_NULL()); | |
24cb81a6 | 4049 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4050 | } |
4051 | ||
d15c9ede XL |
4052 | if (!asoc->peer.prsctp_capable) |
4053 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4054 | ||
1da177e4 | 4055 | /* Make sure that the FORWARD_TSN chunk has valid length. */ |
0fc2ea92 | 4056 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 4057 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4058 | commands); |
4059 | ||
4060 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4061 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4062 | len = ntohs(chunk->chunk_hdr->length); | |
4063 | len -= sizeof(struct sctp_chunkhdr); | |
4064 | skb_pull(chunk->skb, len); | |
4065 | ||
4066 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4067 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4068 | |
4069 | /* The TSN is too high--silently discard the chunk and count on it | |
4070 | * getting retransmitted later. | |
4071 | */ | |
4072 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4073 | goto discard_noforce; | |
4074 | ||
0fc2ea92 XL |
4075 | if (!asoc->stream.si->validate_ftsn(chunk)) |
4076 | goto discard_noforce; | |
9fcb95a1 | 4077 | |
1da177e4 | 4078 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 4079 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 4080 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4081 | SCTP_CHUNK(chunk)); |
d808ad9a | 4082 | |
1da177e4 | 4083 | /* Count this as receiving DATA. */ |
9f70f46b | 4084 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
4085 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
4086 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
4087 | } | |
d808ad9a | 4088 | |
1da177e4 | 4089 | /* FIXME: For now send a SACK, but DATA processing may |
d808ad9a | 4090 | * send another. |
1da177e4 LT |
4091 | */ |
4092 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE()); | |
1da177e4 LT |
4093 | |
4094 | return SCTP_DISPOSITION_CONSUME; | |
4095 | ||
4096 | discard_noforce: | |
4097 | return SCTP_DISPOSITION_DISCARD; | |
4098 | } | |
4099 | ||
172a1599 XL |
4100 | enum sctp_disposition sctp_sf_eat_fwd_tsn_fast( |
4101 | struct net *net, | |
4102 | const struct sctp_endpoint *ep, | |
4103 | const struct sctp_association *asoc, | |
4104 | const union sctp_subtype type, | |
4105 | void *arg, | |
4106 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4107 | { |
1da177e4 | 4108 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4109 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
4110 | __u16 len; |
4111 | __u32 tsn; | |
4112 | ||
4113 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4114 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4115 | SCTP_NULL()); | |
24cb81a6 | 4116 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4117 | } |
4118 | ||
d15c9ede XL |
4119 | if (!asoc->peer.prsctp_capable) |
4120 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4121 | ||
1da177e4 | 4122 | /* Make sure that the FORWARD_TSN chunk has a valid length. */ |
0fc2ea92 | 4123 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 4124 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4125 | commands); |
4126 | ||
4127 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4128 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4129 | len = ntohs(chunk->chunk_hdr->length); | |
4130 | len -= sizeof(struct sctp_chunkhdr); | |
4131 | skb_pull(chunk->skb, len); | |
4132 | ||
4133 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4134 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4135 | |
4136 | /* The TSN is too high--silently discard the chunk and count on it | |
4137 | * getting retransmitted later. | |
4138 | */ | |
4139 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4140 | goto gen_shutdown; | |
4141 | ||
0fc2ea92 XL |
4142 | if (!asoc->stream.si->validate_ftsn(chunk)) |
4143 | goto gen_shutdown; | |
9fcb95a1 | 4144 | |
1da177e4 | 4145 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 4146 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 4147 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4148 | SCTP_CHUNK(chunk)); |
d808ad9a | 4149 | |
1da177e4 LT |
4150 | /* Go a head and force a SACK, since we are shutting down. */ |
4151 | gen_shutdown: | |
4152 | /* Implementor's Guide. | |
4153 | * | |
4154 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
4155 | * respond to each received packet containing one or more DATA chunk(s) | |
4156 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
4157 | */ | |
4158 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
4159 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
4160 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
4161 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
4162 | ||
d808ad9a | 4163 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4164 | } |
4165 | ||
bbd0d598 | 4166 | /* |
25985edc | 4167 | * SCTP-AUTH Section 6.3 Receiving authenticated chukns |
bbd0d598 VY |
4168 | * |
4169 | * The receiver MUST use the HMAC algorithm indicated in the HMAC | |
4170 | * Identifier field. If this algorithm was not specified by the | |
4171 | * receiver in the HMAC-ALGO parameter in the INIT or INIT-ACK chunk | |
4172 | * during association setup, the AUTH chunk and all chunks after it MUST | |
4173 | * be discarded and an ERROR chunk SHOULD be sent with the error cause | |
4174 | * defined in Section 4.1. | |
4175 | * | |
4176 | * If an endpoint with no shared key receives a Shared Key Identifier | |
4177 | * other than 0, it MUST silently discard all authenticated chunks. If | |
4178 | * the endpoint has at least one endpoint pair shared key for the peer, | |
4179 | * it MUST use the key specified by the Shared Key Identifier if a | |
4180 | * key has been configured for that Shared Key Identifier. If no | |
4181 | * endpoint pair shared key has been configured for that Shared Key | |
4182 | * Identifier, all authenticated chunks MUST be silently discarded. | |
4183 | * | |
4184 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4185 | * | |
4186 | * The return value is the disposition of the chunk. | |
4187 | */ | |
4785c7ae | 4188 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 | 4189 | const struct sctp_association *asoc, |
172a1599 | 4190 | struct sctp_chunk *chunk) |
bbd0d598 | 4191 | { |
1b1e0bc9 | 4192 | struct sctp_shared_key *sh_key = NULL; |
bbd0d598 | 4193 | struct sctp_authhdr *auth_hdr; |
172a1599 | 4194 | __u8 *save_digest, *digest; |
bbd0d598 VY |
4195 | struct sctp_hmac *hmac; |
4196 | unsigned int sig_len; | |
4197 | __u16 key_id; | |
bbd0d598 VY |
4198 | |
4199 | /* Pull in the auth header, so we can do some more verification */ | |
4200 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
4201 | chunk->subh.auth_hdr = auth_hdr; | |
bb96dec7 | 4202 | skb_pull(chunk->skb, sizeof(*auth_hdr)); |
bbd0d598 | 4203 | |
02582e9b | 4204 | /* Make sure that we support the HMAC algorithm from the auth |
bbd0d598 VY |
4205 | * chunk. |
4206 | */ | |
4207 | if (!sctp_auth_asoc_verify_hmac_id(asoc, auth_hdr->hmac_id)) | |
4208 | return SCTP_IERROR_AUTH_BAD_HMAC; | |
4209 | ||
4210 | /* Make sure that the provided shared key identifier has been | |
4211 | * configured | |
4212 | */ | |
4213 | key_id = ntohs(auth_hdr->shkey_id); | |
1b1e0bc9 XL |
4214 | if (key_id != asoc->active_key_id) { |
4215 | sh_key = sctp_auth_get_shkey(asoc, key_id); | |
4216 | if (!sh_key) | |
4217 | return SCTP_IERROR_AUTH_BAD_KEYID; | |
4218 | } | |
bbd0d598 VY |
4219 | |
4220 | /* Make sure that the length of the signature matches what | |
4221 | * we expect. | |
4222 | */ | |
bb96dec7 XL |
4223 | sig_len = ntohs(chunk->chunk_hdr->length) - |
4224 | sizeof(struct sctp_auth_chunk); | |
bbd0d598 VY |
4225 | hmac = sctp_auth_get_hmac(ntohs(auth_hdr->hmac_id)); |
4226 | if (sig_len != hmac->hmac_len) | |
4227 | return SCTP_IERROR_PROTO_VIOLATION; | |
4228 | ||
4229 | /* Now that we've done validation checks, we can compute and | |
4230 | * verify the hmac. The steps involved are: | |
4231 | * 1. Save the digest from the chunk. | |
4232 | * 2. Zero out the digest in the chunk. | |
4233 | * 3. Compute the new digest | |
4234 | * 4. Compare saved and new digests. | |
4235 | */ | |
4236 | digest = auth_hdr->hmac; | |
4237 | skb_pull(chunk->skb, sig_len); | |
4238 | ||
4239 | save_digest = kmemdup(digest, sig_len, GFP_ATOMIC); | |
4240 | if (!save_digest) | |
4241 | goto nomem; | |
4242 | ||
4243 | memset(digest, 0, sig_len); | |
4244 | ||
4245 | sctp_auth_calculate_hmac(asoc, chunk->skb, | |
bb96dec7 | 4246 | (struct sctp_auth_chunk *)chunk->chunk_hdr, |
1b1e0bc9 | 4247 | sh_key, GFP_ATOMIC); |
bbd0d598 VY |
4248 | |
4249 | /* Discard the packet if the digests do not match */ | |
4250 | if (memcmp(save_digest, digest, sig_len)) { | |
4251 | kfree(save_digest); | |
4252 | return SCTP_IERROR_BAD_SIG; | |
4253 | } | |
4254 | ||
4255 | kfree(save_digest); | |
4256 | chunk->auth = 1; | |
4257 | ||
4258 | return SCTP_IERROR_NO_ERROR; | |
4259 | nomem: | |
4260 | return SCTP_IERROR_NOMEM; | |
4261 | } | |
4262 | ||
172a1599 XL |
4263 | enum sctp_disposition sctp_sf_eat_auth(struct net *net, |
4264 | const struct sctp_endpoint *ep, | |
4265 | const struct sctp_association *asoc, | |
4266 | const union sctp_subtype type, | |
4267 | void *arg, struct sctp_cmd_seq *commands) | |
bbd0d598 | 4268 | { |
bbd0d598 | 4269 | struct sctp_chunk *chunk = arg; |
4785c7ae | 4270 | struct sctp_authhdr *auth_hdr; |
bbd0d598 | 4271 | struct sctp_chunk *err_chunk; |
4785c7ae | 4272 | enum sctp_ierror error; |
bbd0d598 | 4273 | |
d2f19fa1 WY |
4274 | /* Make sure that the peer has AUTH capable */ |
4275 | if (!asoc->peer.auth_capable) | |
24cb81a6 | 4276 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); |
d2f19fa1 | 4277 | |
bbd0d598 VY |
4278 | if (!sctp_vtag_verify(chunk, asoc)) { |
4279 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4280 | SCTP_NULL()); | |
24cb81a6 | 4281 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 VY |
4282 | } |
4283 | ||
4284 | /* Make sure that the AUTH chunk has valid length. */ | |
4285 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_auth_chunk))) | |
24cb81a6 | 4286 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
bbd0d598 VY |
4287 | commands); |
4288 | ||
4289 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
59d8d443 | 4290 | error = sctp_sf_authenticate(asoc, chunk); |
bbd0d598 | 4291 | switch (error) { |
7fd71b1e JP |
4292 | case SCTP_IERROR_AUTH_BAD_HMAC: |
4293 | /* Generate the ERROR chunk and discard the rest | |
4294 | * of the packet | |
4295 | */ | |
4296 | err_chunk = sctp_make_op_error(asoc, chunk, | |
4297 | SCTP_ERROR_UNSUP_HMAC, | |
4298 | &auth_hdr->hmac_id, | |
4299 | sizeof(__u16), 0); | |
4300 | if (err_chunk) { | |
4301 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4302 | SCTP_CHUNK(err_chunk)); | |
4303 | } | |
4304 | /* Fall Through */ | |
4305 | case SCTP_IERROR_AUTH_BAD_KEYID: | |
4306 | case SCTP_IERROR_BAD_SIG: | |
24cb81a6 | 4307 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
7fd71b1e JP |
4308 | |
4309 | case SCTP_IERROR_PROTO_VIOLATION: | |
24cb81a6 | 4310 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
7fd71b1e JP |
4311 | commands); |
4312 | ||
4313 | case SCTP_IERROR_NOMEM: | |
4314 | return SCTP_DISPOSITION_NOMEM; | |
4315 | ||
4316 | default: /* Prevent gcc warnings */ | |
4317 | break; | |
bbd0d598 VY |
4318 | } |
4319 | ||
65b07e5d VY |
4320 | if (asoc->active_key_id != ntohs(auth_hdr->shkey_id)) { |
4321 | struct sctp_ulpevent *ev; | |
4322 | ||
4323 | ev = sctp_ulpevent_make_authkey(asoc, ntohs(auth_hdr->shkey_id), | |
ec2e506c | 4324 | SCTP_AUTH_NEW_KEY, GFP_ATOMIC); |
65b07e5d VY |
4325 | |
4326 | if (!ev) | |
4327 | return -ENOMEM; | |
4328 | ||
4329 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
4330 | SCTP_ULPEVENT(ev)); | |
4331 | } | |
4332 | ||
bbd0d598 VY |
4333 | return SCTP_DISPOSITION_CONSUME; |
4334 | } | |
4335 | ||
1da177e4 LT |
4336 | /* |
4337 | * Process an unknown chunk. | |
4338 | * | |
4339 | * Section: 3.2. Also, 2.1 in the implementor's guide. | |
4340 | * | |
4341 | * Chunk Types are encoded such that the highest-order two bits specify | |
4342 | * the action that must be taken if the processing endpoint does not | |
4343 | * recognize the Chunk Type. | |
4344 | * | |
4345 | * 00 - Stop processing this SCTP packet and discard it, do not process | |
4346 | * any further chunks within it. | |
4347 | * | |
4348 | * 01 - Stop processing this SCTP packet and discard it, do not process | |
4349 | * any further chunks within it, and report the unrecognized | |
4350 | * chunk in an 'Unrecognized Chunk Type'. | |
4351 | * | |
4352 | * 10 - Skip this chunk and continue processing. | |
4353 | * | |
4354 | * 11 - Skip this chunk and continue processing, but report in an ERROR | |
4355 | * Chunk using the 'Unrecognized Chunk Type' cause of error. | |
4356 | * | |
4357 | * The return value is the disposition of the chunk. | |
4358 | */ | |
172a1599 XL |
4359 | enum sctp_disposition sctp_sf_unk_chunk(struct net *net, |
4360 | const struct sctp_endpoint *ep, | |
4361 | const struct sctp_association *asoc, | |
4362 | const union sctp_subtype type, | |
4363 | void *arg, | |
4364 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4365 | { |
4366 | struct sctp_chunk *unk_chunk = arg; | |
4367 | struct sctp_chunk *err_chunk; | |
922dbc5b | 4368 | struct sctp_chunkhdr *hdr; |
1da177e4 | 4369 | |
bb33381d | 4370 | pr_debug("%s: processing unknown chunk id:%d\n", __func__, type.chunk); |
1da177e4 LT |
4371 | |
4372 | if (!sctp_vtag_verify(unk_chunk, asoc)) | |
24cb81a6 | 4373 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4374 | |
4375 | /* Make sure that the chunk has a valid length. | |
4376 | * Since we don't know the chunk type, we use a general | |
4377 | * chunkhdr structure to make a comparison. | |
4378 | */ | |
922dbc5b | 4379 | if (!sctp_chunk_length_valid(unk_chunk, sizeof(*hdr))) |
24cb81a6 | 4380 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4381 | commands); |
4382 | ||
4383 | switch (type.chunk & SCTP_CID_ACTION_MASK) { | |
4384 | case SCTP_CID_ACTION_DISCARD: | |
4385 | /* Discard the packet. */ | |
24cb81a6 | 4386 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4387 | case SCTP_CID_ACTION_DISCARD_ERR: |
1da177e4 LT |
4388 | /* Generate an ERROR chunk as response. */ |
4389 | hdr = unk_chunk->chunk_hdr; | |
4390 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4391 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4392 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4393 | 0); |
1da177e4 LT |
4394 | if (err_chunk) { |
4395 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4396 | SCTP_CHUNK(err_chunk)); | |
4397 | } | |
2e3216cd VY |
4398 | |
4399 | /* Discard the packet. */ | |
24cb81a6 | 4400 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4401 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4402 | case SCTP_CID_ACTION_SKIP: |
4403 | /* Skip the chunk. */ | |
4404 | return SCTP_DISPOSITION_DISCARD; | |
1da177e4 LT |
4405 | case SCTP_CID_ACTION_SKIP_ERR: |
4406 | /* Generate an ERROR chunk as response. */ | |
4407 | hdr = unk_chunk->chunk_hdr; | |
4408 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4409 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4410 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4411 | 0); |
1da177e4 LT |
4412 | if (err_chunk) { |
4413 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4414 | SCTP_CHUNK(err_chunk)); | |
4415 | } | |
4416 | /* Skip the chunk. */ | |
4417 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
4418 | default: |
4419 | break; | |
4420 | } | |
4421 | ||
4422 | return SCTP_DISPOSITION_DISCARD; | |
4423 | } | |
4424 | ||
4425 | /* | |
4426 | * Discard the chunk. | |
4427 | * | |
4428 | * Section: 0.2, 5.2.3, 5.2.5, 5.2.6, 6.0, 8.4.6, 8.5.1c, 9.2 | |
4429 | * [Too numerous to mention...] | |
4430 | * Verification Tag: No verification needed. | |
4431 | * Inputs | |
4432 | * (endpoint, asoc, chunk) | |
4433 | * | |
4434 | * Outputs | |
4435 | * (asoc, reply_msg, msg_up, timers, counters) | |
4436 | * | |
4437 | * The return value is the disposition of the chunk. | |
4438 | */ | |
172a1599 XL |
4439 | enum sctp_disposition sctp_sf_discard_chunk(struct net *net, |
4440 | const struct sctp_endpoint *ep, | |
4441 | const struct sctp_association *asoc, | |
4442 | const union sctp_subtype type, | |
4443 | void *arg, | |
4444 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4445 | { |
ece25dfa VY |
4446 | struct sctp_chunk *chunk = arg; |
4447 | ||
4448 | /* Make sure that the chunk has a valid length. | |
4449 | * Since we don't know the chunk type, we use a general | |
4450 | * chunkhdr structure to make a comparison. | |
4451 | */ | |
922dbc5b | 4452 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4453 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4454 | commands); |
4455 | ||
bb33381d DB |
4456 | pr_debug("%s: chunk:%d is discarded\n", __func__, type.chunk); |
4457 | ||
1da177e4 LT |
4458 | return SCTP_DISPOSITION_DISCARD; |
4459 | } | |
4460 | ||
4461 | /* | |
4462 | * Discard the whole packet. | |
4463 | * | |
4464 | * Section: 8.4 2) | |
4465 | * | |
4466 | * 2) If the OOTB packet contains an ABORT chunk, the receiver MUST | |
4467 | * silently discard the OOTB packet and take no further action. | |
1da177e4 LT |
4468 | * |
4469 | * Verification Tag: No verification necessary | |
4470 | * | |
4471 | * Inputs | |
4472 | * (endpoint, asoc, chunk) | |
4473 | * | |
4474 | * Outputs | |
4475 | * (asoc, reply_msg, msg_up, timers, counters) | |
4476 | * | |
4477 | * The return value is the disposition of the chunk. | |
4478 | */ | |
172a1599 XL |
4479 | enum sctp_disposition sctp_sf_pdiscard(struct net *net, |
4480 | const struct sctp_endpoint *ep, | |
4481 | const struct sctp_association *asoc, | |
4482 | const union sctp_subtype type, | |
4483 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 4484 | { |
24cb81a6 | 4485 | SCTP_INC_STATS(net, SCTP_MIB_IN_PKT_DISCARDS); |
1da177e4 LT |
4486 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
4487 | ||
4488 | return SCTP_DISPOSITION_CONSUME; | |
4489 | } | |
4490 | ||
4491 | ||
4492 | /* | |
4493 | * The other end is violating protocol. | |
4494 | * | |
4495 | * Section: Not specified | |
4496 | * Verification Tag: Not specified | |
4497 | * Inputs | |
4498 | * (endpoint, asoc, chunk) | |
4499 | * | |
4500 | * Outputs | |
4501 | * (asoc, reply_msg, msg_up, timers, counters) | |
4502 | * | |
4503 | * We simply tag the chunk as a violation. The state machine will log | |
4504 | * the violation and continue. | |
4505 | */ | |
172a1599 XL |
4506 | enum sctp_disposition sctp_sf_violation(struct net *net, |
4507 | const struct sctp_endpoint *ep, | |
4508 | const struct sctp_association *asoc, | |
4509 | const union sctp_subtype type, | |
4510 | void *arg, | |
4511 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4512 | { |
ece25dfa VY |
4513 | struct sctp_chunk *chunk = arg; |
4514 | ||
4515 | /* Make sure that the chunk has a valid length. */ | |
922dbc5b | 4516 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4517 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4518 | commands); |
4519 | ||
1da177e4 LT |
4520 | return SCTP_DISPOSITION_VIOLATION; |
4521 | } | |
4522 | ||
1da177e4 | 4523 | /* |
aecedeab | 4524 | * Common function to handle a protocol violation. |
1da177e4 | 4525 | */ |
172a1599 XL |
4526 | static enum sctp_disposition sctp_sf_abort_violation( |
4527 | struct net *net, | |
4528 | const struct sctp_endpoint *ep, | |
4529 | const struct sctp_association *asoc, | |
4530 | void *arg, | |
4531 | struct sctp_cmd_seq *commands, | |
4532 | const __u8 *payload, | |
4533 | const size_t paylen) | |
1da177e4 | 4534 | { |
ece25dfa | 4535 | struct sctp_packet *packet = NULL; |
1da177e4 LT |
4536 | struct sctp_chunk *chunk = arg; |
4537 | struct sctp_chunk *abort = NULL; | |
1da177e4 | 4538 | |
bbd0d598 VY |
4539 | /* SCTP-AUTH, Section 6.3: |
4540 | * It should be noted that if the receiver wants to tear | |
4541 | * down an association in an authenticated way only, the | |
4542 | * handling of malformed packets should not result in | |
4543 | * tearing down the association. | |
4544 | * | |
4545 | * This means that if we only want to abort associations | |
4546 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 4547 | * can't destroy this association just because the packet |
bbd0d598 VY |
4548 | * was malformed. |
4549 | */ | |
4550 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
4551 | goto discard; | |
4552 | ||
9abed245 JJ |
4553 | /* Make the abort chunk. */ |
4554 | abort = sctp_make_abort_violation(asoc, chunk, payload, paylen); | |
4555 | if (!abort) | |
4556 | goto nomem; | |
4557 | ||
ece25dfa | 4558 | if (asoc) { |
f4ad85ca GJ |
4559 | /* Treat INIT-ACK as a special case during COOKIE-WAIT. */ |
4560 | if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK && | |
4561 | !asoc->peer.i.init_tag) { | |
cb1844c4 | 4562 | struct sctp_initack_chunk *initack; |
f4ad85ca | 4563 | |
cb1844c4 XL |
4564 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
4565 | if (!sctp_chunk_length_valid(chunk, sizeof(*initack))) | |
f4ad85ca GJ |
4566 | abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T; |
4567 | else { | |
4568 | unsigned int inittag; | |
4569 | ||
4570 | inittag = ntohl(initack->init_hdr.init_tag); | |
4571 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG, | |
4572 | SCTP_U32(inittag)); | |
4573 | } | |
4574 | } | |
4575 | ||
ece25dfa | 4576 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
b01a2407 | 4577 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 4578 | |
ece25dfa VY |
4579 | if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) { |
4580 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
4581 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4582 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4583 | SCTP_ERROR(ECONNREFUSED)); | |
4584 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
4585 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
4586 | } else { | |
4587 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4588 | SCTP_ERROR(ECONNABORTED)); | |
4589 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4590 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 | 4591 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
ece25dfa | 4592 | } |
1da177e4 | 4593 | } else { |
2ce95503 | 4594 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
ece25dfa VY |
4595 | |
4596 | if (!packet) | |
4597 | goto nomem_pkt; | |
4598 | ||
4599 | if (sctp_test_T_bit(abort)) | |
4600 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
4601 | ||
4602 | abort->skb->sk = ep->base.sk; | |
4603 | ||
4604 | sctp_packet_append_chunk(packet, abort); | |
4605 | ||
4606 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
4607 | SCTP_PACKET(packet)); | |
4608 | ||
b01a2407 | 4609 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
4610 | } |
4611 | ||
b01a2407 | 4612 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
d808ad9a | 4613 | |
56eb82bb | 4614 | discard: |
24cb81a6 | 4615 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
1da177e4 LT |
4616 | return SCTP_DISPOSITION_ABORT; |
4617 | ||
ece25dfa VY |
4618 | nomem_pkt: |
4619 | sctp_chunk_free(abort); | |
1da177e4 LT |
4620 | nomem: |
4621 | return SCTP_DISPOSITION_NOMEM; | |
4622 | } | |
4623 | ||
aecedeab WY |
4624 | /* |
4625 | * Handle a protocol violation when the chunk length is invalid. | |
025dfdaf | 4626 | * "Invalid" length is identified as smaller than the minimal length a |
aecedeab | 4627 | * given chunk can be. For example, a SACK chunk has invalid length |
d4d6c614 | 4628 | * if its length is set to be smaller than the size of struct sctp_sack_chunk. |
aecedeab WY |
4629 | * |
4630 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4631 | * error code. | |
4632 | * | |
4633 | * Section: Not specified | |
4634 | * Verification Tag: Nothing to do | |
4635 | * Inputs | |
4636 | * (endpoint, asoc, chunk) | |
4637 | * | |
4638 | * Outputs | |
4639 | * (reply_msg, msg_up, counters) | |
4640 | * | |
4641 | * Generate an ABORT chunk and terminate the association. | |
4642 | */ | |
172a1599 XL |
4643 | static enum sctp_disposition sctp_sf_violation_chunklen( |
4644 | struct net *net, | |
4645 | const struct sctp_endpoint *ep, | |
4646 | const struct sctp_association *asoc, | |
4647 | const union sctp_subtype type, | |
4648 | void *arg, | |
4649 | struct sctp_cmd_seq *commands) | |
aecedeab | 4650 | { |
cb3f837b | 4651 | static const char err_str[] = "The following chunk had invalid length:"; |
aecedeab | 4652 | |
24cb81a6 | 4653 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4654 | sizeof(err_str)); |
aecedeab WY |
4655 | } |
4656 | ||
6f4c618d WY |
4657 | /* |
4658 | * Handle a protocol violation when the parameter length is invalid. | |
33c7cfdb SW |
4659 | * If the length is smaller than the minimum length of a given parameter, |
4660 | * or accumulated length in multi parameters exceeds the end of the chunk, | |
4661 | * the length is considered as invalid. | |
6f4c618d | 4662 | */ |
172a1599 XL |
4663 | static enum sctp_disposition sctp_sf_violation_paramlen( |
4664 | struct net *net, | |
4665 | const struct sctp_endpoint *ep, | |
4666 | const struct sctp_association *asoc, | |
4667 | const union sctp_subtype type, | |
4668 | void *arg, void *ext, | |
4669 | struct sctp_cmd_seq *commands) | |
ba016670 | 4670 | { |
ba016670 WY |
4671 | struct sctp_paramhdr *param = ext; |
4672 | struct sctp_chunk *abort = NULL; | |
172a1599 | 4673 | struct sctp_chunk *chunk = arg; |
6f4c618d | 4674 | |
ba016670 WY |
4675 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) |
4676 | goto discard; | |
4677 | ||
4678 | /* Make the abort chunk. */ | |
4679 | abort = sctp_make_violation_paramlen(asoc, chunk, param); | |
4680 | if (!abort) | |
4681 | goto nomem; | |
4682 | ||
4683 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
b01a2407 | 4684 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
ba016670 WY |
4685 | |
4686 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4687 | SCTP_ERROR(ECONNABORTED)); | |
4688 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4689 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 EB |
4690 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
4691 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
ba016670 WY |
4692 | |
4693 | discard: | |
24cb81a6 | 4694 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
ba016670 WY |
4695 | return SCTP_DISPOSITION_ABORT; |
4696 | nomem: | |
4697 | return SCTP_DISPOSITION_NOMEM; | |
6f4c618d WY |
4698 | } |
4699 | ||
aecedeab WY |
4700 | /* Handle a protocol violation when the peer trying to advance the |
4701 | * cumulative tsn ack to a point beyond the max tsn currently sent. | |
4702 | * | |
4703 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4704 | * error code. | |
4705 | */ | |
172a1599 XL |
4706 | static enum sctp_disposition sctp_sf_violation_ctsn( |
4707 | struct net *net, | |
4708 | const struct sctp_endpoint *ep, | |
4709 | const struct sctp_association *asoc, | |
4710 | const union sctp_subtype type, | |
4711 | void *arg, | |
4712 | struct sctp_cmd_seq *commands) | |
aecedeab | 4713 | { |
cb3f837b | 4714 | static const char err_str[] = "The cumulative tsn ack beyond the max tsn currently sent:"; |
aecedeab | 4715 | |
24cb81a6 | 4716 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4717 | sizeof(err_str)); |
aecedeab WY |
4718 | } |
4719 | ||
ece25dfa | 4720 | /* Handle protocol violation of an invalid chunk bundling. For example, |
25985edc | 4721 | * when we have an association and we receive bundled INIT-ACK, or |
ece25dfa | 4722 | * SHUDOWN-COMPLETE, our peer is clearly violationg the "MUST NOT bundle" |
25985edc | 4723 | * statement from the specs. Additionally, there might be an attacker |
ece25dfa VY |
4724 | * on the path and we may not want to continue this communication. |
4725 | */ | |
172a1599 XL |
4726 | static enum sctp_disposition sctp_sf_violation_chunk( |
4727 | struct net *net, | |
4728 | const struct sctp_endpoint *ep, | |
4729 | const struct sctp_association *asoc, | |
4730 | const union sctp_subtype type, | |
4731 | void *arg, | |
4732 | struct sctp_cmd_seq *commands) | |
ece25dfa | 4733 | { |
cb3f837b | 4734 | static const char err_str[] = "The following chunk violates protocol:"; |
ece25dfa VY |
4735 | |
4736 | if (!asoc) | |
24cb81a6 | 4737 | return sctp_sf_violation(net, ep, asoc, type, arg, commands); |
ece25dfa | 4738 | |
24cb81a6 | 4739 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4740 | sizeof(err_str)); |
ece25dfa | 4741 | } |
1da177e4 LT |
4742 | /*************************************************************************** |
4743 | * These are the state functions for handling primitive (Section 10) events. | |
4744 | ***************************************************************************/ | |
4745 | /* | |
4746 | * sctp_sf_do_prm_asoc | |
4747 | * | |
4748 | * Section: 10.1 ULP-to-SCTP | |
4749 | * B) Associate | |
4750 | * | |
4751 | * Format: ASSOCIATE(local SCTP instance name, destination transport addr, | |
4752 | * outbound stream count) | |
4753 | * -> association id [,destination transport addr list] [,outbound stream | |
4754 | * count] | |
4755 | * | |
4756 | * This primitive allows the upper layer to initiate an association to a | |
4757 | * specific peer endpoint. | |
4758 | * | |
4759 | * The peer endpoint shall be specified by one of the transport addresses | |
4760 | * which defines the endpoint (see Section 1.4). If the local SCTP | |
4761 | * instance has not been initialized, the ASSOCIATE is considered an | |
4762 | * error. | |
4763 | * [This is not relevant for the kernel implementation since we do all | |
4764 | * initialization at boot time. It we hadn't initialized we wouldn't | |
4765 | * get anywhere near this code.] | |
4766 | * | |
4767 | * An association id, which is a local handle to the SCTP association, | |
4768 | * will be returned on successful establishment of the association. If | |
4769 | * SCTP is not able to open an SCTP association with the peer endpoint, | |
4770 | * an error is returned. | |
4771 | * [In the kernel implementation, the struct sctp_association needs to | |
4772 | * be created BEFORE causing this primitive to run.] | |
4773 | * | |
4774 | * Other association parameters may be returned, including the | |
4775 | * complete destination transport addresses of the peer as well as the | |
4776 | * outbound stream count of the local endpoint. One of the transport | |
4777 | * address from the returned destination addresses will be selected by | |
4778 | * the local endpoint as default primary path for sending SCTP packets | |
4779 | * to this peer. The returned "destination transport addr list" can | |
4780 | * be used by the ULP to change the default primary path or to force | |
4781 | * sending a packet to a specific transport address. [All of this | |
4782 | * stuff happens when the INIT ACK arrives. This is a NON-BLOCKING | |
4783 | * function.] | |
4784 | * | |
4785 | * Mandatory attributes: | |
4786 | * | |
4787 | * o local SCTP instance name - obtained from the INITIALIZE operation. | |
4788 | * [This is the argument asoc.] | |
4789 | * o destination transport addr - specified as one of the transport | |
4790 | * addresses of the peer endpoint with which the association is to be | |
4791 | * established. | |
4792 | * [This is asoc->peer.active_path.] | |
4793 | * o outbound stream count - the number of outbound streams the ULP | |
4794 | * would like to open towards this peer endpoint. | |
4795 | * [BUG: This is not currently implemented.] | |
4796 | * Optional attributes: | |
4797 | * | |
4798 | * None. | |
4799 | * | |
4800 | * The return value is a disposition. | |
4801 | */ | |
172a1599 XL |
4802 | enum sctp_disposition sctp_sf_do_prm_asoc(struct net *net, |
4803 | const struct sctp_endpoint *ep, | |
4804 | const struct sctp_association *asoc, | |
4805 | const union sctp_subtype type, | |
4806 | void *arg, | |
4807 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4808 | { |
26ac8e5f | 4809 | struct sctp_association *my_asoc; |
172a1599 | 4810 | struct sctp_chunk *repl; |
1da177e4 LT |
4811 | |
4812 | /* The comment below says that we enter COOKIE-WAIT AFTER | |
4813 | * sending the INIT, but that doesn't actually work in our | |
4814 | * implementation... | |
4815 | */ | |
4816 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4817 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
4818 | ||
4819 | /* RFC 2960 5.1 Normal Establishment of an Association | |
4820 | * | |
4821 | * A) "A" first sends an INIT chunk to "Z". In the INIT, "A" | |
4822 | * must provide its Verification Tag (Tag_A) in the Initiate | |
4823 | * Tag field. Tag_A SHOULD be a random number in the range of | |
4824 | * 1 to 4294967295 (see 5.3.1 for Tag value selection). ... | |
4825 | */ | |
4826 | ||
4827 | repl = sctp_make_init(asoc, &asoc->base.bind_addr, GFP_ATOMIC, 0); | |
4828 | if (!repl) | |
4829 | goto nomem; | |
4830 | ||
405426f6 DB |
4831 | /* Choose transport for INIT. */ |
4832 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
4833 | SCTP_CHUNK(repl)); | |
4834 | ||
1da177e4 LT |
4835 | /* Cast away the const modifier, as we want to just |
4836 | * rerun it through as a sideffect. | |
4837 | */ | |
ab38fb04 VY |
4838 | my_asoc = (struct sctp_association *)asoc; |
4839 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(my_asoc)); | |
1da177e4 LT |
4840 | |
4841 | /* After sending the INIT, "A" starts the T1-init timer and | |
4842 | * enters the COOKIE-WAIT state. | |
4843 | */ | |
4844 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
4845 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4846 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
4847 | return SCTP_DISPOSITION_CONSUME; | |
4848 | ||
4849 | nomem: | |
4850 | return SCTP_DISPOSITION_NOMEM; | |
4851 | } | |
4852 | ||
4853 | /* | |
4854 | * Process the SEND primitive. | |
4855 | * | |
4856 | * Section: 10.1 ULP-to-SCTP | |
4857 | * E) Send | |
4858 | * | |
4859 | * Format: SEND(association id, buffer address, byte count [,context] | |
4860 | * [,stream id] [,life time] [,destination transport address] | |
4861 | * [,unorder flag] [,no-bundle flag] [,payload protocol-id] ) | |
4862 | * -> result | |
4863 | * | |
4864 | * This is the main method to send user data via SCTP. | |
4865 | * | |
4866 | * Mandatory attributes: | |
4867 | * | |
4868 | * o association id - local handle to the SCTP association | |
4869 | * | |
4870 | * o buffer address - the location where the user message to be | |
4871 | * transmitted is stored; | |
4872 | * | |
4873 | * o byte count - The size of the user data in number of bytes; | |
4874 | * | |
4875 | * Optional attributes: | |
4876 | * | |
4877 | * o context - an optional 32 bit integer that will be carried in the | |
4878 | * sending failure notification to the ULP if the transportation of | |
4879 | * this User Message fails. | |
4880 | * | |
4881 | * o stream id - to indicate which stream to send the data on. If not | |
4882 | * specified, stream 0 will be used. | |
4883 | * | |
4884 | * o life time - specifies the life time of the user data. The user data | |
4885 | * will not be sent by SCTP after the life time expires. This | |
4886 | * parameter can be used to avoid efforts to transmit stale | |
4887 | * user messages. SCTP notifies the ULP if the data cannot be | |
4888 | * initiated to transport (i.e. sent to the destination via SCTP's | |
4889 | * send primitive) within the life time variable. However, the | |
4890 | * user data will be transmitted if SCTP has attempted to transmit a | |
4891 | * chunk before the life time expired. | |
4892 | * | |
4893 | * o destination transport address - specified as one of the destination | |
4894 | * transport addresses of the peer endpoint to which this packet | |
4895 | * should be sent. Whenever possible, SCTP should use this destination | |
4896 | * transport address for sending the packets, instead of the current | |
4897 | * primary path. | |
4898 | * | |
4899 | * o unorder flag - this flag, if present, indicates that the user | |
4900 | * would like the data delivered in an unordered fashion to the peer | |
4901 | * (i.e., the U flag is set to 1 on all DATA chunks carrying this | |
4902 | * message). | |
4903 | * | |
4904 | * o no-bundle flag - instructs SCTP not to bundle this user data with | |
4905 | * other outbound DATA chunks. SCTP MAY still bundle even when | |
4906 | * this flag is present, when faced with network congestion. | |
4907 | * | |
4908 | * o payload protocol-id - A 32 bit unsigned integer that is to be | |
4909 | * passed to the peer indicating the type of payload protocol data | |
4910 | * being transmitted. This value is passed as opaque data by SCTP. | |
4911 | * | |
4912 | * The return value is the disposition. | |
4913 | */ | |
172a1599 XL |
4914 | enum sctp_disposition sctp_sf_do_prm_send(struct net *net, |
4915 | const struct sctp_endpoint *ep, | |
4916 | const struct sctp_association *asoc, | |
4917 | const union sctp_subtype type, | |
4918 | void *arg, | |
4919 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4920 | { |
9c5c62be | 4921 | struct sctp_datamsg *msg = arg; |
1da177e4 | 4922 | |
9c5c62be | 4923 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_MSG, SCTP_DATAMSG(msg)); |
1da177e4 LT |
4924 | return SCTP_DISPOSITION_CONSUME; |
4925 | } | |
4926 | ||
4927 | /* | |
4928 | * Process the SHUTDOWN primitive. | |
4929 | * | |
4930 | * Section: 10.1: | |
4931 | * C) Shutdown | |
4932 | * | |
4933 | * Format: SHUTDOWN(association id) | |
4934 | * -> result | |
4935 | * | |
4936 | * Gracefully closes an association. Any locally queued user data | |
4937 | * will be delivered to the peer. The association will be terminated only | |
4938 | * after the peer acknowledges all the SCTP packets sent. A success code | |
4939 | * will be returned on successful termination of the association. If | |
4940 | * attempting to terminate the association results in a failure, an error | |
4941 | * code shall be returned. | |
4942 | * | |
4943 | * Mandatory attributes: | |
4944 | * | |
4945 | * o association id - local handle to the SCTP association | |
4946 | * | |
4947 | * Optional attributes: | |
4948 | * | |
4949 | * None. | |
4950 | * | |
4951 | * The return value is the disposition. | |
4952 | */ | |
172a1599 XL |
4953 | enum sctp_disposition sctp_sf_do_9_2_prm_shutdown( |
4954 | struct net *net, | |
4955 | const struct sctp_endpoint *ep, | |
4956 | const struct sctp_association *asoc, | |
4957 | const union sctp_subtype type, | |
4958 | void *arg, | |
4959 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4960 | { |
172a1599 | 4961 | enum sctp_disposition disposition; |
1da177e4 LT |
4962 | |
4963 | /* From 9.2 Shutdown of an Association | |
4964 | * Upon receipt of the SHUTDOWN primitive from its upper | |
4965 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
4966 | * remains there until all outstanding data has been | |
4967 | * acknowledged by its peer. The endpoint accepts no new data | |
4968 | * from its upper layer, but retransmits data to the far end | |
4969 | * if necessary to fill gaps. | |
4970 | */ | |
4971 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4972 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
4973 | ||
1da177e4 LT |
4974 | disposition = SCTP_DISPOSITION_CONSUME; |
4975 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 4976 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
4977 | arg, commands); |
4978 | } | |
172a1599 | 4979 | |
1da177e4 LT |
4980 | return disposition; |
4981 | } | |
4982 | ||
4983 | /* | |
4984 | * Process the ABORT primitive. | |
4985 | * | |
4986 | * Section: 10.1: | |
4987 | * C) Abort | |
4988 | * | |
4989 | * Format: Abort(association id [, cause code]) | |
4990 | * -> result | |
4991 | * | |
4992 | * Ungracefully closes an association. Any locally queued user data | |
4993 | * will be discarded and an ABORT chunk is sent to the peer. A success code | |
4994 | * will be returned on successful abortion of the association. If | |
4995 | * attempting to abort the association results in a failure, an error | |
4996 | * code shall be returned. | |
4997 | * | |
4998 | * Mandatory attributes: | |
4999 | * | |
5000 | * o association id - local handle to the SCTP association | |
5001 | * | |
5002 | * Optional attributes: | |
5003 | * | |
5004 | * o cause code - reason of the abort to be passed to the peer | |
5005 | * | |
5006 | * None. | |
5007 | * | |
5008 | * The return value is the disposition. | |
5009 | */ | |
172a1599 XL |
5010 | enum sctp_disposition sctp_sf_do_9_1_prm_abort( |
5011 | struct net *net, | |
5012 | const struct sctp_endpoint *ep, | |
5013 | const struct sctp_association *asoc, | |
5014 | const union sctp_subtype type, | |
5015 | void *arg, | |
5016 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5017 | { |
5018 | /* From 9.1 Abort of an Association | |
5019 | * Upon receipt of the ABORT primitive from its upper | |
5020 | * layer, the endpoint enters CLOSED state and | |
5021 | * discard all outstanding data has been | |
5022 | * acknowledged by its peer. The endpoint accepts no new data | |
5023 | * from its upper layer, but retransmits data to the far end | |
5024 | * if necessary to fill gaps. | |
5025 | */ | |
c164a9ba | 5026 | struct sctp_chunk *abort = arg; |
1da177e4 | 5027 | |
068d8bd3 XL |
5028 | if (abort) |
5029 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5030 | |
5031 | /* Even if we can't send the ABORT due to low memory delete the | |
5032 | * TCB. This is a departure from our typical NOMEM handling. | |
5033 | */ | |
5034 | ||
8de8c873 SS |
5035 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5036 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 LT |
5037 | /* Delete the established association. */ |
5038 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 5039 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5040 | |
b01a2407 EB |
5041 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5042 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 | 5043 | |
649621e3 | 5044 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5045 | } |
5046 | ||
5047 | /* We tried an illegal operation on an association which is closed. */ | |
172a1599 XL |
5048 | enum sctp_disposition sctp_sf_error_closed(struct net *net, |
5049 | const struct sctp_endpoint *ep, | |
5050 | const struct sctp_association *asoc, | |
5051 | const union sctp_subtype type, | |
5052 | void *arg, | |
5053 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5054 | { |
5055 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, SCTP_ERROR(-EINVAL)); | |
5056 | return SCTP_DISPOSITION_CONSUME; | |
5057 | } | |
5058 | ||
5059 | /* We tried an illegal operation on an association which is shutting | |
5060 | * down. | |
5061 | */ | |
172a1599 XL |
5062 | enum sctp_disposition sctp_sf_error_shutdown( |
5063 | struct net *net, | |
5064 | const struct sctp_endpoint *ep, | |
5065 | const struct sctp_association *asoc, | |
5066 | const union sctp_subtype type, | |
5067 | void *arg, | |
5068 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5069 | { |
5070 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, | |
5071 | SCTP_ERROR(-ESHUTDOWN)); | |
5072 | return SCTP_DISPOSITION_CONSUME; | |
5073 | } | |
5074 | ||
5075 | /* | |
5076 | * sctp_cookie_wait_prm_shutdown | |
5077 | * | |
5078 | * Section: 4 Note: 2 | |
5079 | * Verification Tag: | |
5080 | * Inputs | |
5081 | * (endpoint, asoc) | |
5082 | * | |
5083 | * The RFC does not explicitly address this issue, but is the route through the | |
5084 | * state table when someone issues a shutdown while in COOKIE_WAIT state. | |
5085 | * | |
5086 | * Outputs | |
5087 | * (timers) | |
5088 | */ | |
172a1599 XL |
5089 | enum sctp_disposition sctp_sf_cookie_wait_prm_shutdown( |
5090 | struct net *net, | |
5091 | const struct sctp_endpoint *ep, | |
5092 | const struct sctp_association *asoc, | |
5093 | const union sctp_subtype type, | |
5094 | void *arg, | |
5095 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5096 | { |
5097 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5098 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5099 | ||
5100 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5101 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5102 | ||
b01a2407 | 5103 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
1da177e4 LT |
5104 | |
5105 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
5106 | ||
5107 | return SCTP_DISPOSITION_DELETE_TCB; | |
5108 | } | |
5109 | ||
5110 | /* | |
5111 | * sctp_cookie_echoed_prm_shutdown | |
5112 | * | |
5113 | * Section: 4 Note: 2 | |
5114 | * Verification Tag: | |
5115 | * Inputs | |
5116 | * (endpoint, asoc) | |
5117 | * | |
5118 | * The RFC does not explcitly address this issue, but is the route through the | |
5119 | * state table when someone issues a shutdown while in COOKIE_ECHOED state. | |
5120 | * | |
5121 | * Outputs | |
5122 | * (timers) | |
5123 | */ | |
172a1599 XL |
5124 | enum sctp_disposition sctp_sf_cookie_echoed_prm_shutdown( |
5125 | struct net *net, | |
5126 | const struct sctp_endpoint *ep, | |
5127 | const struct sctp_association *asoc, | |
5128 | const union sctp_subtype type, | |
5129 | void *arg, | |
5130 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5131 | { |
5132 | /* There is a single T1 timer, so we should be able to use | |
5133 | * common function with the COOKIE-WAIT state. | |
5134 | */ | |
24cb81a6 | 5135 | return sctp_sf_cookie_wait_prm_shutdown(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5136 | } |
5137 | ||
5138 | /* | |
5139 | * sctp_sf_cookie_wait_prm_abort | |
5140 | * | |
5141 | * Section: 4 Note: 2 | |
5142 | * Verification Tag: | |
5143 | * Inputs | |
5144 | * (endpoint, asoc) | |
5145 | * | |
5146 | * The RFC does not explicitly address this issue, but is the route through the | |
5147 | * state table when someone issues an abort while in COOKIE_WAIT state. | |
5148 | * | |
5149 | * Outputs | |
5150 | * (timers) | |
5151 | */ | |
172a1599 XL |
5152 | enum sctp_disposition sctp_sf_cookie_wait_prm_abort( |
5153 | struct net *net, | |
5154 | const struct sctp_endpoint *ep, | |
5155 | const struct sctp_association *asoc, | |
5156 | const union sctp_subtype type, | |
5157 | void *arg, | |
5158 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5159 | { |
c164a9ba | 5160 | struct sctp_chunk *abort = arg; |
1da177e4 LT |
5161 | |
5162 | /* Stop T1-init timer */ | |
5163 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5164 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1da177e4 | 5165 | |
068d8bd3 XL |
5166 | if (abort) |
5167 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5168 | |
5169 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5170 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5171 | ||
b01a2407 | 5172 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
5173 | |
5174 | /* Even if we can't send the ABORT due to low memory delete the | |
5175 | * TCB. This is a departure from our typical NOMEM handling. | |
5176 | */ | |
5177 | ||
8de8c873 SS |
5178 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5179 | SCTP_ERROR(ECONNREFUSED)); | |
1da177e4 LT |
5180 | /* Delete the established association. */ |
5181 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 5182 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5183 | |
649621e3 | 5184 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5185 | } |
5186 | ||
5187 | /* | |
5188 | * sctp_sf_cookie_echoed_prm_abort | |
5189 | * | |
5190 | * Section: 4 Note: 3 | |
5191 | * Verification Tag: | |
5192 | * Inputs | |
5193 | * (endpoint, asoc) | |
5194 | * | |
5195 | * The RFC does not explcitly address this issue, but is the route through the | |
5196 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5197 | * | |
5198 | * Outputs | |
5199 | * (timers) | |
5200 | */ | |
172a1599 XL |
5201 | enum sctp_disposition sctp_sf_cookie_echoed_prm_abort( |
5202 | struct net *net, | |
5203 | const struct sctp_endpoint *ep, | |
5204 | const struct sctp_association *asoc, | |
5205 | const union sctp_subtype type, | |
5206 | void *arg, | |
5207 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5208 | { |
5209 | /* There is a single T1 timer, so we should be able to use | |
5210 | * common function with the COOKIE-WAIT state. | |
5211 | */ | |
24cb81a6 | 5212 | return sctp_sf_cookie_wait_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5213 | } |
5214 | ||
5215 | /* | |
5216 | * sctp_sf_shutdown_pending_prm_abort | |
5217 | * | |
5218 | * Inputs | |
5219 | * (endpoint, asoc) | |
5220 | * | |
5221 | * The RFC does not explicitly address this issue, but is the route through the | |
5222 | * state table when someone issues an abort while in SHUTDOWN-PENDING state. | |
5223 | * | |
5224 | * Outputs | |
5225 | * (timers) | |
5226 | */ | |
172a1599 XL |
5227 | enum sctp_disposition sctp_sf_shutdown_pending_prm_abort( |
5228 | struct net *net, | |
5229 | const struct sctp_endpoint *ep, | |
5230 | const struct sctp_association *asoc, | |
5231 | const union sctp_subtype type, | |
5232 | void *arg, | |
5233 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5234 | { |
5235 | /* Stop the T5-shutdown guard timer. */ | |
5236 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5237 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5238 | ||
24cb81a6 | 5239 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5240 | } |
5241 | ||
5242 | /* | |
5243 | * sctp_sf_shutdown_sent_prm_abort | |
5244 | * | |
5245 | * Inputs | |
5246 | * (endpoint, asoc) | |
5247 | * | |
5248 | * The RFC does not explicitly address this issue, but is the route through the | |
5249 | * state table when someone issues an abort while in SHUTDOWN-SENT state. | |
5250 | * | |
5251 | * Outputs | |
5252 | * (timers) | |
5253 | */ | |
172a1599 XL |
5254 | enum sctp_disposition sctp_sf_shutdown_sent_prm_abort( |
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 | /* Stop the T2-shutdown timer. */ | |
5263 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5264 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5265 | ||
5266 | /* Stop the T5-shutdown guard timer. */ | |
5267 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5268 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5269 | ||
24cb81a6 | 5270 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5271 | } |
5272 | ||
5273 | /* | |
5274 | * sctp_sf_cookie_echoed_prm_abort | |
5275 | * | |
5276 | * Inputs | |
5277 | * (endpoint, asoc) | |
5278 | * | |
5279 | * The RFC does not explcitly address this issue, but is the route through the | |
5280 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5281 | * | |
5282 | * Outputs | |
5283 | * (timers) | |
5284 | */ | |
172a1599 XL |
5285 | enum sctp_disposition sctp_sf_shutdown_ack_sent_prm_abort( |
5286 | struct net *net, | |
5287 | const struct sctp_endpoint *ep, | |
5288 | const struct sctp_association *asoc, | |
5289 | const union sctp_subtype type, | |
5290 | void *arg, | |
5291 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5292 | { |
5293 | /* The same T2 timer, so we should be able to use | |
5294 | * common function with the SHUTDOWN-SENT state. | |
5295 | */ | |
24cb81a6 | 5296 | return sctp_sf_shutdown_sent_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5297 | } |
5298 | ||
5299 | /* | |
5300 | * Process the REQUESTHEARTBEAT primitive | |
5301 | * | |
5302 | * 10.1 ULP-to-SCTP | |
5303 | * J) Request Heartbeat | |
5304 | * | |
5305 | * Format: REQUESTHEARTBEAT(association id, destination transport address) | |
5306 | * | |
5307 | * -> result | |
5308 | * | |
5309 | * Instructs the local endpoint to perform a HeartBeat on the specified | |
5310 | * destination transport address of the given association. The returned | |
5311 | * result should indicate whether the transmission of the HEARTBEAT | |
5312 | * chunk to the destination address is successful. | |
5313 | * | |
5314 | * Mandatory attributes: | |
5315 | * | |
5316 | * o association id - local handle to the SCTP association | |
5317 | * | |
5318 | * o destination transport address - the transport address of the | |
5319 | * association on which a heartbeat should be issued. | |
5320 | */ | |
172a1599 | 5321 | enum sctp_disposition sctp_sf_do_prm_requestheartbeat( |
24cb81a6 | 5322 | struct net *net, |
1da177e4 LT |
5323 | const struct sctp_endpoint *ep, |
5324 | const struct sctp_association *asoc, | |
bfc6f827 | 5325 | const union sctp_subtype type, |
1da177e4 | 5326 | void *arg, |
a85bbeb2 | 5327 | struct sctp_cmd_seq *commands) |
1da177e4 | 5328 | { |
fb78525a VY |
5329 | if (SCTP_DISPOSITION_NOMEM == sctp_sf_heartbeat(ep, asoc, type, |
5330 | (struct sctp_transport *)arg, commands)) | |
5331 | return SCTP_DISPOSITION_NOMEM; | |
5332 | ||
5333 | /* | |
5334 | * RFC 2960 (bis), section 8.3 | |
5335 | * | |
5336 | * D) Request an on-demand HEARTBEAT on a specific destination | |
5337 | * transport address of a given association. | |
5338 | * | |
5339 | * The endpoint should increment the respective error counter of | |
5340 | * the destination transport address each time a HEARTBEAT is sent | |
5341 | * to that address and not acknowledged within one RTO. | |
5342 | * | |
5343 | */ | |
7e99013a | 5344 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
fb78525a VY |
5345 | SCTP_TRANSPORT(arg)); |
5346 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5347 | } |
5348 | ||
5349 | /* | |
5350 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
5351 | * When an endpoint has an ASCONF signaled change to be sent to the | |
5352 | * remote endpoint it should do A1 to A9 | |
5353 | */ | |
172a1599 XL |
5354 | enum sctp_disposition sctp_sf_do_prm_asconf(struct net *net, |
5355 | const struct sctp_endpoint *ep, | |
5356 | const struct sctp_association *asoc, | |
5357 | const union sctp_subtype type, | |
5358 | void *arg, | |
5359 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5360 | { |
5361 | struct sctp_chunk *chunk = arg; | |
5362 | ||
5363 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5364 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5365 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5366 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5367 | return SCTP_DISPOSITION_CONSUME; | |
5368 | } | |
5369 | ||
7a090b04 | 5370 | /* RE-CONFIG Section 5.1 RECONF Chunk Procedures */ |
172a1599 XL |
5371 | enum sctp_disposition sctp_sf_do_prm_reconf(struct net *net, |
5372 | const struct sctp_endpoint *ep, | |
5373 | const struct sctp_association *asoc, | |
5374 | const union sctp_subtype type, | |
5375 | void *arg, | |
5376 | struct sctp_cmd_seq *commands) | |
7a090b04 XL |
5377 | { |
5378 | struct sctp_chunk *chunk = arg; | |
5379 | ||
5380 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5381 | return SCTP_DISPOSITION_CONSUME; | |
5382 | } | |
5383 | ||
1da177e4 LT |
5384 | /* |
5385 | * Ignore the primitive event | |
5386 | * | |
5387 | * The return value is the disposition of the primitive. | |
5388 | */ | |
172a1599 XL |
5389 | enum sctp_disposition sctp_sf_ignore_primitive( |
5390 | struct net *net, | |
5391 | const struct sctp_endpoint *ep, | |
5392 | const struct sctp_association *asoc, | |
5393 | const union sctp_subtype type, | |
5394 | void *arg, | |
5395 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5396 | { |
bb33381d DB |
5397 | pr_debug("%s: primitive type:%d is ignored\n", __func__, |
5398 | type.primitive); | |
5399 | ||
1da177e4 LT |
5400 | return SCTP_DISPOSITION_DISCARD; |
5401 | } | |
5402 | ||
5403 | /*************************************************************************** | |
5404 | * These are the state functions for the OTHER events. | |
5405 | ***************************************************************************/ | |
5406 | ||
e1cdd553 WY |
5407 | /* |
5408 | * When the SCTP stack has no more user data to send or retransmit, this | |
5409 | * notification is given to the user. Also, at the time when a user app | |
5410 | * subscribes to this event, if there is no data to be sent or | |
5411 | * retransmit, the stack will immediately send up this notification. | |
5412 | */ | |
172a1599 XL |
5413 | enum sctp_disposition sctp_sf_do_no_pending_tsn( |
5414 | struct net *net, | |
5415 | const struct sctp_endpoint *ep, | |
5416 | const struct sctp_association *asoc, | |
5417 | const union sctp_subtype type, | |
5418 | void *arg, | |
5419 | struct sctp_cmd_seq *commands) | |
e1cdd553 WY |
5420 | { |
5421 | struct sctp_ulpevent *event; | |
5422 | ||
5423 | event = sctp_ulpevent_make_sender_dry_event(asoc, GFP_ATOMIC); | |
5424 | if (!event) | |
5425 | return SCTP_DISPOSITION_NOMEM; | |
5426 | ||
5427 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(event)); | |
5428 | ||
5429 | return SCTP_DISPOSITION_CONSUME; | |
5430 | } | |
5431 | ||
1da177e4 LT |
5432 | /* |
5433 | * Start the shutdown negotiation. | |
5434 | * | |
5435 | * From Section 9.2: | |
5436 | * Once all its outstanding data has been acknowledged, the endpoint | |
5437 | * shall send a SHUTDOWN chunk to its peer including in the Cumulative | |
5438 | * TSN Ack field the last sequential TSN it has received from the peer. | |
5439 | * It shall then start the T2-shutdown timer and enter the SHUTDOWN-SENT | |
5440 | * state. If the timer expires, the endpoint must re-send the SHUTDOWN | |
5441 | * with the updated last sequential TSN received from its peer. | |
5442 | * | |
5443 | * The return value is the disposition. | |
5444 | */ | |
172a1599 XL |
5445 | enum sctp_disposition sctp_sf_do_9_2_start_shutdown( |
5446 | struct net *net, | |
5447 | const struct sctp_endpoint *ep, | |
5448 | const struct sctp_association *asoc, | |
5449 | const union sctp_subtype type, | |
5450 | void *arg, | |
5451 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5452 | { |
5453 | struct sctp_chunk *reply; | |
5454 | ||
5455 | /* Once all its outstanding data has been acknowledged, the | |
5456 | * endpoint shall send a SHUTDOWN chunk to its peer including | |
5457 | * in the Cumulative TSN Ack field the last sequential TSN it | |
5458 | * has received from the peer. | |
5459 | */ | |
5460 | reply = sctp_make_shutdown(asoc, NULL); | |
5461 | if (!reply) | |
5462 | goto nomem; | |
5463 | ||
5464 | /* Set the transport for the SHUTDOWN chunk and the timeout for the | |
5465 | * T2-shutdown timer. | |
5466 | */ | |
5467 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5468 | ||
5469 | /* It shall then start the T2-shutdown timer */ | |
5470 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5471 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5472 | ||
536428a9 WY |
5473 | /* RFC 4960 Section 9.2 |
5474 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5475 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5476 | */ | |
f8d96052 | 5477 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
536428a9 WY |
5478 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
5479 | ||
9f70f46b | 5480 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5481 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5482 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5483 | ||
5484 | /* and enter the SHUTDOWN-SENT state. */ | |
5485 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5486 | SCTP_STATE(SCTP_STATE_SHUTDOWN_SENT)); | |
5487 | ||
5488 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5489 | * | |
5490 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5491 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5492 | */ |
5493 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5494 | ||
5495 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5496 | ||
5497 | return SCTP_DISPOSITION_CONSUME; | |
5498 | ||
5499 | nomem: | |
5500 | return SCTP_DISPOSITION_NOMEM; | |
5501 | } | |
5502 | ||
5503 | /* | |
5504 | * Generate a SHUTDOWN ACK now that everything is SACK'd. | |
5505 | * | |
5506 | * From Section 9.2: | |
5507 | * | |
5508 | * If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5509 | * shall send a SHUTDOWN ACK and start a T2-shutdown timer of its own, | |
5510 | * entering the SHUTDOWN-ACK-SENT state. If the timer expires, the | |
5511 | * endpoint must re-send the SHUTDOWN ACK. | |
5512 | * | |
5513 | * The return value is the disposition. | |
5514 | */ | |
172a1599 XL |
5515 | enum sctp_disposition sctp_sf_do_9_2_shutdown_ack( |
5516 | struct net *net, | |
5517 | const struct sctp_endpoint *ep, | |
5518 | const struct sctp_association *asoc, | |
5519 | const union sctp_subtype type, | |
5520 | void *arg, | |
5521 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5522 | { |
172a1599 | 5523 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
5524 | struct sctp_chunk *reply; |
5525 | ||
5526 | /* There are 2 ways of getting here: | |
5527 | * 1) called in response to a SHUTDOWN chunk | |
5528 | * 2) called when SCTP_EVENT_NO_PENDING_TSN event is issued. | |
5529 | * | |
5530 | * For the case (2), the arg parameter is set to NULL. We need | |
5531 | * to check that we have a chunk before accessing it's fields. | |
5532 | */ | |
5533 | if (chunk) { | |
5534 | if (!sctp_vtag_verify(chunk, asoc)) | |
ac23e681 XL |
5535 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
5536 | commands); | |
1da177e4 LT |
5537 | |
5538 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 XL |
5539 | if (!sctp_chunk_length_valid( |
5540 | chunk, sizeof(struct sctp_shutdown_chunk))) | |
5541 | return sctp_sf_violation_chunklen(net, ep, asoc, type, | |
5542 | arg, commands); | |
1da177e4 LT |
5543 | } |
5544 | ||
5545 | /* If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5546 | * shall send a SHUTDOWN ACK ... | |
5547 | */ | |
5548 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
5549 | if (!reply) | |
5550 | goto nomem; | |
5551 | ||
5552 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
5553 | * the T2-shutdown timer. | |
5554 | */ | |
5555 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5556 | ||
5557 | /* and start/restart a T2-shutdown timer of its own, */ | |
5558 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5559 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5560 | ||
9f70f46b | 5561 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5562 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5563 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5564 | ||
5565 | /* Enter the SHUTDOWN-ACK-SENT state. */ | |
5566 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5567 | SCTP_STATE(SCTP_STATE_SHUTDOWN_ACK_SENT)); | |
5568 | ||
5569 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5570 | * | |
5571 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5572 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5573 | */ |
5574 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5575 | ||
5576 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5577 | ||
5578 | return SCTP_DISPOSITION_CONSUME; | |
5579 | ||
5580 | nomem: | |
5581 | return SCTP_DISPOSITION_NOMEM; | |
5582 | } | |
5583 | ||
5584 | /* | |
5585 | * Ignore the event defined as other | |
5586 | * | |
5587 | * The return value is the disposition of the event. | |
5588 | */ | |
172a1599 XL |
5589 | enum sctp_disposition sctp_sf_ignore_other(struct net *net, |
5590 | const struct sctp_endpoint *ep, | |
5591 | const struct sctp_association *asoc, | |
5592 | const union sctp_subtype type, | |
5593 | void *arg, | |
5594 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5595 | { |
bb33381d DB |
5596 | pr_debug("%s: the event other type:%d is ignored\n", |
5597 | __func__, type.other); | |
5598 | ||
1da177e4 LT |
5599 | return SCTP_DISPOSITION_DISCARD; |
5600 | } | |
5601 | ||
5602 | /************************************************************ | |
5603 | * These are the state functions for handling timeout events. | |
5604 | ************************************************************/ | |
5605 | ||
5606 | /* | |
5607 | * RTX Timeout | |
5608 | * | |
5609 | * Section: 6.3.3 Handle T3-rtx Expiration | |
5610 | * | |
5611 | * Whenever the retransmission timer T3-rtx expires for a destination | |
5612 | * address, do the following: | |
5613 | * [See below] | |
5614 | * | |
5615 | * The return value is the disposition of the chunk. | |
5616 | */ | |
172a1599 XL |
5617 | enum sctp_disposition sctp_sf_do_6_3_3_rtx(struct net *net, |
5618 | const struct sctp_endpoint *ep, | |
5619 | const struct sctp_association *asoc, | |
5620 | const union sctp_subtype type, | |
5621 | void *arg, | |
5622 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5623 | { |
5624 | struct sctp_transport *transport = arg; | |
5625 | ||
b01a2407 | 5626 | SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS); |
ac0b0462 | 5627 | |
1da177e4 | 5628 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8a0d19c5 | 5629 | if (asoc->peer.zero_window_announced && |
5630 | asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { | |
f8d96052 TG |
5631 | /* |
5632 | * We are here likely because the receiver had its rwnd | |
5633 | * closed for a while and we have not been able to | |
5634 | * transmit the locally queued data within the maximum | |
5635 | * retransmission attempts limit. Start the T5 | |
5636 | * shutdown guard timer to give the receiver one last | |
5637 | * chance and some additional time to recover before | |
5638 | * aborting. | |
5639 | */ | |
5640 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START_ONCE, | |
5641 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5642 | } else { | |
5643 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
5644 | SCTP_ERROR(ETIMEDOUT)); | |
5645 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
5646 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5647 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
b01a2407 EB |
5648 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5649 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
f8d96052 TG |
5650 | return SCTP_DISPOSITION_DELETE_TCB; |
5651 | } | |
1da177e4 LT |
5652 | } |
5653 | ||
5654 | /* E1) For the destination address for which the timer | |
5655 | * expires, adjust its ssthresh with rules defined in Section | |
5656 | * 7.2.3 and set the cwnd <- MTU. | |
5657 | */ | |
5658 | ||
5659 | /* E2) For the destination address for which the timer | |
5660 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
5661 | * maximum value discussed in rule C7 above (RTO.max) may be | |
5662 | * used to provide an upper bound to this doubling operation. | |
5663 | */ | |
5664 | ||
5665 | /* E3) Determine how many of the earliest (i.e., lowest TSN) | |
5666 | * outstanding DATA chunks for the address for which the | |
5667 | * T3-rtx has expired will fit into a single packet, subject | |
5668 | * to the MTU constraint for the path corresponding to the | |
5669 | * destination transport address to which the retransmission | |
5670 | * is being sent (this may be different from the address for | |
5671 | * which the timer expires [see Section 6.4]). Call this | |
5672 | * value K. Bundle and retransmit those K DATA chunks in a | |
5673 | * single packet to the destination endpoint. | |
5674 | * | |
5675 | * Note: Any DATA chunks that were sent to the address for | |
5676 | * which the T3-rtx timer expired but did not fit in one MTU | |
5677 | * (rule E3 above), should be marked for retransmission and | |
5678 | * sent as soon as cwnd allows (normally when a SACK arrives). | |
5679 | */ | |
5680 | ||
1da177e4 LT |
5681 | /* Do some failure management (Section 8.2). */ |
5682 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
5683 | ||
1845a579 VY |
5684 | /* NB: Rules E4 and F1 are implicit in R1. */ |
5685 | sctp_add_cmd_sf(commands, SCTP_CMD_RETRAN, SCTP_TRANSPORT(transport)); | |
5686 | ||
1da177e4 LT |
5687 | return SCTP_DISPOSITION_CONSUME; |
5688 | } | |
5689 | ||
5690 | /* | |
5691 | * Generate delayed SACK on timeout | |
5692 | * | |
5693 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
5694 | * | |
5695 | * The guidelines on delayed acknowledgement algorithm specified in | |
5696 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
5697 | * acknowledgement SHOULD be generated for at least every second packet | |
5698 | * (not every second DATA chunk) received, and SHOULD be generated | |
5699 | * within 200 ms of the arrival of any unacknowledged DATA chunk. In | |
5700 | * some situations it may be beneficial for an SCTP transmitter to be | |
5701 | * more conservative than the algorithms detailed in this document | |
5702 | * allow. However, an SCTP transmitter MUST NOT be more aggressive than | |
5703 | * the following algorithms allow. | |
5704 | */ | |
172a1599 XL |
5705 | enum sctp_disposition sctp_sf_do_6_2_sack(struct net *net, |
5706 | const struct sctp_endpoint *ep, | |
5707 | const struct sctp_association *asoc, | |
5708 | const union sctp_subtype type, | |
5709 | void *arg, | |
5710 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5711 | { |
b01a2407 | 5712 | SCTP_INC_STATS(net, SCTP_MIB_DELAY_SACK_EXPIREDS); |
1da177e4 LT |
5713 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); |
5714 | return SCTP_DISPOSITION_CONSUME; | |
5715 | } | |
5716 | ||
5717 | /* | |
3f7a87d2 | 5718 | * sctp_sf_t1_init_timer_expire |
1da177e4 LT |
5719 | * |
5720 | * Section: 4 Note: 2 | |
5721 | * Verification Tag: | |
5722 | * Inputs | |
5723 | * (endpoint, asoc) | |
5724 | * | |
5725 | * RFC 2960 Section 4 Notes | |
5726 | * 2) If the T1-init timer expires, the endpoint MUST retransmit INIT | |
5727 | * and re-start the T1-init timer without changing state. This MUST | |
5728 | * be repeated up to 'Max.Init.Retransmits' times. After that, the | |
5729 | * endpoint MUST abort the initialization process and report the | |
5730 | * error to SCTP user. | |
5731 | * | |
3f7a87d2 FF |
5732 | * Outputs |
5733 | * (timers, events) | |
5734 | * | |
5735 | */ | |
172a1599 XL |
5736 | enum sctp_disposition sctp_sf_t1_init_timer_expire( |
5737 | struct net *net, | |
5738 | const struct sctp_endpoint *ep, | |
5739 | const struct sctp_association *asoc, | |
5740 | const union sctp_subtype type, | |
5741 | void *arg, | |
5742 | struct sctp_cmd_seq *commands) | |
3f7a87d2 | 5743 | { |
172a1599 | 5744 | int attempts = asoc->init_err_counter + 1; |
3f7a87d2 FF |
5745 | struct sctp_chunk *repl = NULL; |
5746 | struct sctp_bind_addr *bp; | |
3f7a87d2 | 5747 | |
bb33381d DB |
5748 | pr_debug("%s: timer T1 expired (INIT)\n", __func__); |
5749 | ||
b01a2407 | 5750 | SCTP_INC_STATS(net, SCTP_MIB_T1_INIT_EXPIREDS); |
3f7a87d2 | 5751 | |
81845c21 | 5752 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 FF |
5753 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; |
5754 | repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0); | |
5755 | if (!repl) | |
5756 | return SCTP_DISPOSITION_NOMEM; | |
5757 | ||
5758 | /* Choose transport for INIT. */ | |
5759 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
5760 | SCTP_CHUNK(repl)); | |
5761 | ||
5762 | /* Issue a sideeffect to do the needed accounting. */ | |
5763 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART, | |
5764 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5765 | ||
5766 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
5767 | } else { | |
bb33381d DB |
5768 | pr_debug("%s: giving up on INIT, attempts:%d " |
5769 | "max_init_attempts:%d\n", __func__, attempts, | |
5770 | asoc->max_init_attempts); | |
5771 | ||
8de8c873 SS |
5772 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5773 | SCTP_ERROR(ETIMEDOUT)); | |
3f7a87d2 | 5774 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5775 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
3f7a87d2 FF |
5776 | return SCTP_DISPOSITION_DELETE_TCB; |
5777 | } | |
5778 | ||
5779 | return SCTP_DISPOSITION_CONSUME; | |
5780 | } | |
5781 | ||
5782 | /* | |
5783 | * sctp_sf_t1_cookie_timer_expire | |
5784 | * | |
5785 | * Section: 4 Note: 2 | |
5786 | * Verification Tag: | |
5787 | * Inputs | |
5788 | * (endpoint, asoc) | |
5789 | * | |
5790 | * RFC 2960 Section 4 Notes | |
5791 | * 3) If the T1-cookie timer expires, the endpoint MUST retransmit | |
1da177e4 LT |
5792 | * COOKIE ECHO and re-start the T1-cookie timer without changing |
5793 | * state. This MUST be repeated up to 'Max.Init.Retransmits' times. | |
5794 | * After that, the endpoint MUST abort the initialization process and | |
5795 | * report the error to SCTP user. | |
5796 | * | |
5797 | * Outputs | |
5798 | * (timers, events) | |
5799 | * | |
5800 | */ | |
172a1599 XL |
5801 | enum sctp_disposition sctp_sf_t1_cookie_timer_expire( |
5802 | struct net *net, | |
5803 | const struct sctp_endpoint *ep, | |
5804 | const struct sctp_association *asoc, | |
5805 | const union sctp_subtype type, | |
5806 | void *arg, | |
5807 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5808 | { |
3f7a87d2 | 5809 | int attempts = asoc->init_err_counter + 1; |
172a1599 | 5810 | struct sctp_chunk *repl = NULL; |
1da177e4 | 5811 | |
bb33381d DB |
5812 | pr_debug("%s: timer T1 expired (COOKIE-ECHO)\n", __func__); |
5813 | ||
b01a2407 | 5814 | SCTP_INC_STATS(net, SCTP_MIB_T1_COOKIE_EXPIREDS); |
1da177e4 | 5815 | |
81845c21 | 5816 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 | 5817 | repl = sctp_make_cookie_echo(asoc, NULL); |
1da177e4 | 5818 | if (!repl) |
3f7a87d2 | 5819 | return SCTP_DISPOSITION_NOMEM; |
1da177e4 | 5820 | |
96cd0d3d VY |
5821 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, |
5822 | SCTP_CHUNK(repl)); | |
1da177e4 | 5823 | /* Issue a sideeffect to do the needed accounting. */ |
3f7a87d2 FF |
5824 | sctp_add_cmd_sf(commands, SCTP_CMD_COOKIEECHO_RESTART, |
5825 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
5826 | ||
1da177e4 LT |
5827 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
5828 | } else { | |
8de8c873 SS |
5829 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5830 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5831 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5832 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 LT |
5833 | return SCTP_DISPOSITION_DELETE_TCB; |
5834 | } | |
5835 | ||
5836 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5837 | } |
5838 | ||
5839 | /* RFC2960 9.2 If the timer expires, the endpoint must re-send the SHUTDOWN | |
5840 | * with the updated last sequential TSN received from its peer. | |
5841 | * | |
5842 | * An endpoint should limit the number of retransmissions of the | |
5843 | * SHUTDOWN chunk to the protocol parameter 'Association.Max.Retrans'. | |
5844 | * If this threshold is exceeded the endpoint should destroy the TCB and | |
5845 | * MUST report the peer endpoint unreachable to the upper layer (and | |
5846 | * thus the association enters the CLOSED state). The reception of any | |
5847 | * packet from its peer (i.e. as the peer sends all of its queued DATA | |
5848 | * chunks) should clear the endpoint's retransmission count and restart | |
5849 | * the T2-Shutdown timer, giving its peer ample opportunity to transmit | |
5850 | * all of its queued DATA chunks that have not yet been sent. | |
5851 | */ | |
172a1599 XL |
5852 | enum sctp_disposition sctp_sf_t2_timer_expire( |
5853 | struct net *net, | |
5854 | const struct sctp_endpoint *ep, | |
5855 | const struct sctp_association *asoc, | |
5856 | const union sctp_subtype type, | |
5857 | void *arg, | |
5858 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5859 | { |
5860 | struct sctp_chunk *reply = NULL; | |
5861 | ||
bb33381d DB |
5862 | pr_debug("%s: timer T2 expired\n", __func__); |
5863 | ||
b01a2407 | 5864 | SCTP_INC_STATS(net, SCTP_MIB_T2_SHUTDOWN_EXPIREDS); |
ac0b0462 | 5865 | |
58fbbed4 NH |
5866 | ((struct sctp_association *)asoc)->shutdown_retries++; |
5867 | ||
1da177e4 | 5868 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
5869 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5870 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
5871 | /* Note: CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
5872 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 5873 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
5874 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5875 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
5876 | return SCTP_DISPOSITION_DELETE_TCB; |
5877 | } | |
5878 | ||
5879 | switch (asoc->state) { | |
5880 | case SCTP_STATE_SHUTDOWN_SENT: | |
5881 | reply = sctp_make_shutdown(asoc, NULL); | |
5882 | break; | |
5883 | ||
5884 | case SCTP_STATE_SHUTDOWN_ACK_SENT: | |
5885 | reply = sctp_make_shutdown_ack(asoc, NULL); | |
5886 | break; | |
5887 | ||
5888 | default: | |
5889 | BUG(); | |
5890 | break; | |
3ff50b79 | 5891 | } |
1da177e4 LT |
5892 | |
5893 | if (!reply) | |
5894 | goto nomem; | |
5895 | ||
6345b199 WY |
5896 | /* Do some failure management (Section 8.2). |
5897 | * If we remove the transport an SHUTDOWN was last sent to, don't | |
5898 | * do failure management. | |
5899 | */ | |
5900 | if (asoc->shutdown_last_sent_to) | |
5901 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
5902 | SCTP_TRANSPORT(asoc->shutdown_last_sent_to)); | |
1da177e4 LT |
5903 | |
5904 | /* Set the transport for the SHUTDOWN/ACK chunk and the timeout for | |
5905 | * the T2-shutdown timer. | |
5906 | */ | |
5907 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5908 | ||
5909 | /* Restart the T2-shutdown timer. */ | |
5910 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5911 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5912 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5913 | return SCTP_DISPOSITION_CONSUME; | |
5914 | ||
5915 | nomem: | |
5916 | return SCTP_DISPOSITION_NOMEM; | |
5917 | } | |
5918 | ||
5919 | /* | |
5920 | * ADDIP Section 4.1 ASCONF CHunk Procedures | |
5921 | * If the T4 RTO timer expires the endpoint should do B1 to B5 | |
5922 | */ | |
172a1599 XL |
5923 | enum sctp_disposition sctp_sf_t4_timer_expire( |
5924 | struct net *net, | |
5925 | const struct sctp_endpoint *ep, | |
5926 | const struct sctp_association *asoc, | |
5927 | const union sctp_subtype type, | |
5928 | void *arg, | |
5929 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5930 | { |
5931 | struct sctp_chunk *chunk = asoc->addip_last_asconf; | |
5932 | struct sctp_transport *transport = chunk->transport; | |
5933 | ||
b01a2407 | 5934 | SCTP_INC_STATS(net, SCTP_MIB_T4_RTO_EXPIREDS); |
ac0b0462 | 5935 | |
1da177e4 LT |
5936 | /* ADDIP 4.1 B1) Increment the error counters and perform path failure |
5937 | * detection on the appropriate destination address as defined in | |
5938 | * RFC2960 [5] section 8.1 and 8.2. | |
5939 | */ | |
10a43cea WY |
5940 | if (transport) |
5941 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
5942 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
5943 | |
5944 | /* Reconfig T4 timer and transport. */ | |
5945 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5946 | ||
5947 | /* ADDIP 4.1 B2) Increment the association error counters and perform | |
5948 | * endpoint failure detection on the association as defined in | |
5949 | * RFC2960 [5] section 8.1 and 8.2. | |
5950 | * association error counter is incremented in SCTP_CMD_STRIKE. | |
5951 | */ | |
5952 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
5953 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5954 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
8de8c873 SS |
5955 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5956 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5957 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 5958 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
5959 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5960 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
5961 | return SCTP_DISPOSITION_ABORT; |
5962 | } | |
5963 | ||
5964 | /* ADDIP 4.1 B3) Back-off the destination address RTO value to which | |
5965 | * the ASCONF chunk was sent by doubling the RTO timer value. | |
5966 | * This is done in SCTP_CMD_STRIKE. | |
5967 | */ | |
5968 | ||
5969 | /* ADDIP 4.1 B4) Re-transmit the ASCONF Chunk last sent and if possible | |
5970 | * choose an alternate destination address (please refer to RFC2960 | |
5971 | * [5] section 6.4.1). An endpoint MUST NOT add new parameters to this | |
d808ad9a | 5972 | * chunk, it MUST be the same (including its serial number) as the last |
1da177e4 LT |
5973 | * ASCONF sent. |
5974 | */ | |
5975 | sctp_chunk_hold(asoc->addip_last_asconf); | |
5976 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
5977 | SCTP_CHUNK(asoc->addip_last_asconf)); | |
5978 | ||
5979 | /* ADDIP 4.1 B5) Restart the T-4 RTO timer. Note that if a different | |
5980 | * destination is selected, then the RTO used will be that of the new | |
5981 | * destination address. | |
5982 | */ | |
5983 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5984 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5985 | ||
5986 | return SCTP_DISPOSITION_CONSUME; | |
5987 | } | |
5988 | ||
5989 | /* sctpimpguide-05 Section 2.12.2 | |
5990 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5991 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5992 | * At the expiration of this timer the sender SHOULD abort the association | |
5993 | * by sending an ABORT chunk. | |
5994 | */ | |
172a1599 XL |
5995 | enum sctp_disposition sctp_sf_t5_timer_expire( |
5996 | struct net *net, | |
5997 | const struct sctp_endpoint *ep, | |
5998 | const struct sctp_association *asoc, | |
5999 | const union sctp_subtype type, | |
6000 | void *arg, | |
6001 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6002 | { |
6003 | struct sctp_chunk *reply = NULL; | |
6004 | ||
bb33381d DB |
6005 | pr_debug("%s: timer T5 expired\n", __func__); |
6006 | ||
b01a2407 | 6007 | SCTP_INC_STATS(net, SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS); |
1da177e4 LT |
6008 | |
6009 | reply = sctp_make_abort(asoc, NULL, 0); | |
6010 | if (!reply) | |
6011 | goto nomem; | |
6012 | ||
6013 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
8de8c873 SS |
6014 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6015 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 6016 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6017 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 | 6018 | |
b01a2407 EB |
6019 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6020 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
a1080a8b | 6021 | |
1da177e4 LT |
6022 | return SCTP_DISPOSITION_DELETE_TCB; |
6023 | nomem: | |
6024 | return SCTP_DISPOSITION_NOMEM; | |
6025 | } | |
6026 | ||
6027 | /* Handle expiration of AUTOCLOSE timer. When the autoclose timer expires, | |
6028 | * the association is automatically closed by starting the shutdown process. | |
6029 | * The work that needs to be done is same as when SHUTDOWN is initiated by | |
6030 | * the user. So this routine looks same as sctp_sf_do_9_2_prm_shutdown(). | |
6031 | */ | |
172a1599 XL |
6032 | enum sctp_disposition sctp_sf_autoclose_timer_expire( |
6033 | struct net *net, | |
6034 | const struct sctp_endpoint *ep, | |
6035 | const struct sctp_association *asoc, | |
6036 | const union sctp_subtype type, | |
6037 | void *arg, | |
6038 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6039 | { |
172a1599 | 6040 | enum sctp_disposition disposition; |
1da177e4 | 6041 | |
b01a2407 | 6042 | SCTP_INC_STATS(net, SCTP_MIB_AUTOCLOSE_EXPIREDS); |
ac0b0462 | 6043 | |
1da177e4 LT |
6044 | /* From 9.2 Shutdown of an Association |
6045 | * Upon receipt of the SHUTDOWN primitive from its upper | |
6046 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
6047 | * remains there until all outstanding data has been | |
6048 | * acknowledged by its peer. The endpoint accepts no new data | |
6049 | * from its upper layer, but retransmits data to the far end | |
6050 | * if necessary to fill gaps. | |
6051 | */ | |
6052 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
6053 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
6054 | ||
1da177e4 LT |
6055 | disposition = SCTP_DISPOSITION_CONSUME; |
6056 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 6057 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
6058 | arg, commands); |
6059 | } | |
172a1599 | 6060 | |
1da177e4 LT |
6061 | return disposition; |
6062 | } | |
6063 | ||
6064 | /***************************************************************************** | |
6065 | * These are sa state functions which could apply to all types of events. | |
6066 | ****************************************************************************/ | |
6067 | ||
6068 | /* | |
6069 | * This table entry is not implemented. | |
6070 | * | |
6071 | * Inputs | |
6072 | * (endpoint, asoc, chunk) | |
6073 | * | |
6074 | * The return value is the disposition of the chunk. | |
6075 | */ | |
172a1599 XL |
6076 | enum sctp_disposition sctp_sf_not_impl(struct net *net, |
6077 | const struct sctp_endpoint *ep, | |
6078 | const struct sctp_association *asoc, | |
6079 | const union sctp_subtype type, | |
6080 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6081 | { |
6082 | return SCTP_DISPOSITION_NOT_IMPL; | |
6083 | } | |
6084 | ||
6085 | /* | |
6086 | * This table entry represents a bug. | |
6087 | * | |
6088 | * Inputs | |
6089 | * (endpoint, asoc, chunk) | |
6090 | * | |
6091 | * The return value is the disposition of the chunk. | |
6092 | */ | |
172a1599 XL |
6093 | enum sctp_disposition sctp_sf_bug(struct net *net, |
6094 | const struct sctp_endpoint *ep, | |
6095 | const struct sctp_association *asoc, | |
6096 | const union sctp_subtype type, | |
6097 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6098 | { |
6099 | return SCTP_DISPOSITION_BUG; | |
6100 | } | |
6101 | ||
6102 | /* | |
6103 | * This table entry represents the firing of a timer in the wrong state. | |
6104 | * Since timer deletion cannot be guaranteed a timer 'may' end up firing | |
6105 | * when the association is in the wrong state. This event should | |
6106 | * be ignored, so as to prevent any rearming of the timer. | |
6107 | * | |
6108 | * Inputs | |
6109 | * (endpoint, asoc, chunk) | |
6110 | * | |
6111 | * The return value is the disposition of the chunk. | |
6112 | */ | |
172a1599 XL |
6113 | enum sctp_disposition sctp_sf_timer_ignore(struct net *net, |
6114 | const struct sctp_endpoint *ep, | |
6115 | const struct sctp_association *asoc, | |
6116 | const union sctp_subtype type, | |
6117 | void *arg, | |
6118 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6119 | { |
bb33381d DB |
6120 | pr_debug("%s: timer %d ignored\n", __func__, type.chunk); |
6121 | ||
1da177e4 LT |
6122 | return SCTP_DISPOSITION_CONSUME; |
6123 | } | |
6124 | ||
6125 | /******************************************************************** | |
6126 | * 2nd Level Abstractions | |
6127 | ********************************************************************/ | |
6128 | ||
6129 | /* Pull the SACK chunk based on the SACK header. */ | |
6130 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk) | |
6131 | { | |
6132 | struct sctp_sackhdr *sack; | |
172a1599 | 6133 | __u16 num_dup_tsns; |
1da177e4 LT |
6134 | unsigned int len; |
6135 | __u16 num_blocks; | |
1da177e4 LT |
6136 | |
6137 | /* Protect ourselves from reading too far into | |
6138 | * the skb from a bogus sender. | |
6139 | */ | |
6140 | sack = (struct sctp_sackhdr *) chunk->skb->data; | |
6141 | ||
6142 | num_blocks = ntohs(sack->num_gap_ack_blocks); | |
6143 | num_dup_tsns = ntohs(sack->num_dup_tsns); | |
6144 | len = sizeof(struct sctp_sackhdr); | |
6145 | len += (num_blocks + num_dup_tsns) * sizeof(__u32); | |
6146 | if (len > chunk->skb->len) | |
6147 | return NULL; | |
6148 | ||
6149 | skb_pull(chunk->skb, len); | |
6150 | ||
6151 | return sack; | |
6152 | } | |
6153 | ||
6154 | /* Create an ABORT packet to be sent as a response, with the specified | |
6155 | * error causes. | |
6156 | */ | |
172a1599 XL |
6157 | static struct sctp_packet *sctp_abort_pkt_new( |
6158 | struct net *net, | |
6159 | const struct sctp_endpoint *ep, | |
6160 | const struct sctp_association *asoc, | |
6161 | struct sctp_chunk *chunk, | |
6162 | const void *payload, size_t paylen) | |
1da177e4 LT |
6163 | { |
6164 | struct sctp_packet *packet; | |
6165 | struct sctp_chunk *abort; | |
6166 | ||
2ce95503 | 6167 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6168 | |
6169 | if (packet) { | |
6170 | /* Make an ABORT. | |
6171 | * The T bit will be set if the asoc is NULL. | |
6172 | */ | |
6173 | abort = sctp_make_abort(asoc, chunk, paylen); | |
6174 | if (!abort) { | |
6175 | sctp_ootb_pkt_free(packet); | |
6176 | return NULL; | |
6177 | } | |
047a2428 JF |
6178 | |
6179 | /* Reflect vtag if T-Bit is set */ | |
6180 | if (sctp_test_T_bit(abort)) | |
6181 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
6182 | ||
1da177e4 LT |
6183 | /* Add specified error causes, i.e., payload, to the |
6184 | * end of the chunk. | |
6185 | */ | |
6186 | sctp_addto_chunk(abort, paylen, payload); | |
6187 | ||
6188 | /* Set the skb to the belonging sock for accounting. */ | |
6189 | abort->skb->sk = ep->base.sk; | |
6190 | ||
6191 | sctp_packet_append_chunk(packet, abort); | |
6192 | ||
6193 | } | |
6194 | ||
6195 | return packet; | |
6196 | } | |
6197 | ||
6198 | /* Allocate a packet for responding in the OOTB conditions. */ | |
172a1599 XL |
6199 | static struct sctp_packet *sctp_ootb_pkt_new( |
6200 | struct net *net, | |
6201 | const struct sctp_association *asoc, | |
6202 | const struct sctp_chunk *chunk) | |
1da177e4 | 6203 | { |
1da177e4 | 6204 | struct sctp_transport *transport; |
172a1599 XL |
6205 | struct sctp_packet *packet; |
6206 | __u16 sport, dport; | |
1da177e4 LT |
6207 | __u32 vtag; |
6208 | ||
6209 | /* Get the source and destination port from the inbound packet. */ | |
6210 | sport = ntohs(chunk->sctp_hdr->dest); | |
6211 | dport = ntohs(chunk->sctp_hdr->source); | |
6212 | ||
6213 | /* The V-tag is going to be the same as the inbound packet if no | |
6214 | * association exists, otherwise, use the peer's vtag. | |
6215 | */ | |
6216 | if (asoc) { | |
02c4e12c WY |
6217 | /* Special case the INIT-ACK as there is no peer's vtag |
6218 | * yet. | |
6219 | */ | |
cb3f837b | 6220 | switch (chunk->chunk_hdr->type) { |
02c4e12c WY |
6221 | case SCTP_CID_INIT_ACK: |
6222 | { | |
cb1844c4 | 6223 | struct sctp_initack_chunk *initack; |
02c4e12c | 6224 | |
cb1844c4 | 6225 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
02c4e12c WY |
6226 | vtag = ntohl(initack->init_hdr.init_tag); |
6227 | break; | |
6228 | } | |
6229 | default: | |
6230 | vtag = asoc->peer.i.init_tag; | |
6231 | break; | |
6232 | } | |
1da177e4 LT |
6233 | } else { |
6234 | /* Special case the INIT and stale COOKIE_ECHO as there is no | |
6235 | * vtag yet. | |
6236 | */ | |
cb3f837b | 6237 | switch (chunk->chunk_hdr->type) { |
1da177e4 LT |
6238 | case SCTP_CID_INIT: |
6239 | { | |
01a992be | 6240 | struct sctp_init_chunk *init; |
1da177e4 | 6241 | |
01a992be | 6242 | init = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
6243 | vtag = ntohl(init->init_hdr.init_tag); |
6244 | break; | |
6245 | } | |
d808ad9a | 6246 | default: |
1da177e4 LT |
6247 | vtag = ntohl(chunk->sctp_hdr->vtag); |
6248 | break; | |
6249 | } | |
6250 | } | |
6251 | ||
6252 | /* Make a transport for the bucket, Eliza... */ | |
89bf3450 | 6253 | transport = sctp_transport_new(net, sctp_source(chunk), GFP_ATOMIC); |
1da177e4 LT |
6254 | if (!transport) |
6255 | goto nomem; | |
6256 | ||
6257 | /* Cache a route for the transport with the chunk's destination as | |
6258 | * the source address. | |
6259 | */ | |
16b0a030 | 6260 | sctp_transport_route(transport, (union sctp_addr *)&chunk->dest, |
2ce95503 | 6261 | sctp_sk(net->sctp.ctl_sock)); |
1da177e4 | 6262 | |
66b91d2c MRL |
6263 | packet = &transport->packet; |
6264 | sctp_packet_init(packet, transport, sport, dport); | |
6265 | sctp_packet_config(packet, vtag, 0); | |
1da177e4 LT |
6266 | |
6267 | return packet; | |
6268 | ||
6269 | nomem: | |
6270 | return NULL; | |
6271 | } | |
6272 | ||
6273 | /* Free the packet allocated earlier for responding in the OOTB condition. */ | |
6274 | void sctp_ootb_pkt_free(struct sctp_packet *packet) | |
6275 | { | |
6276 | sctp_transport_free(packet->transport); | |
6277 | } | |
6278 | ||
6279 | /* Send a stale cookie error when a invalid COOKIE ECHO chunk is found */ | |
24cb81a6 EB |
6280 | static void sctp_send_stale_cookie_err(struct net *net, |
6281 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
6282 | const struct sctp_association *asoc, |
6283 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 6284 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
6285 | struct sctp_chunk *err_chunk) |
6286 | { | |
6287 | struct sctp_packet *packet; | |
6288 | ||
6289 | if (err_chunk) { | |
2ce95503 | 6290 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6291 | if (packet) { |
6292 | struct sctp_signed_cookie *cookie; | |
6293 | ||
6294 | /* Override the OOTB vtag from the cookie. */ | |
6295 | cookie = chunk->subh.cookie_hdr; | |
6296 | packet->vtag = cookie->c.peer_vtag; | |
d808ad9a | 6297 | |
1da177e4 LT |
6298 | /* Set the skb to the belonging sock for accounting. */ |
6299 | err_chunk->skb->sk = ep->base.sk; | |
6300 | sctp_packet_append_chunk(packet, err_chunk); | |
6301 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
6302 | SCTP_PACKET(packet)); | |
b01a2407 | 6303 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
6304 | } else |
6305 | sctp_chunk_free (err_chunk); | |
6306 | } | |
6307 | } | |
6308 | ||
6309 | ||
6310 | /* Process a data chunk */ | |
6311 | static int sctp_eat_data(const struct sctp_association *asoc, | |
6312 | struct sctp_chunk *chunk, | |
a85bbeb2 | 6313 | struct sctp_cmd_seq *commands) |
1da177e4 | 6314 | { |
7c3ceb4f | 6315 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
049b3ff5 | 6316 | struct sock *sk = asoc->base.sk; |
24cb81a6 | 6317 | struct net *net = sock_net(sk); |
172a1599 XL |
6318 | struct sctp_datahdr *data_hdr; |
6319 | struct sctp_chunk *err; | |
6320 | enum sctp_verb deliver; | |
6321 | size_t datalen; | |
172a1599 XL |
6322 | __u32 tsn; |
6323 | int tmp; | |
1da177e4 | 6324 | |
3583df1a XL |
6325 | data_hdr = (struct sctp_datahdr *)chunk->skb->data; |
6326 | chunk->subh.data_hdr = data_hdr; | |
9d4ceaf1 | 6327 | skb_pull(chunk->skb, sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
6328 | |
6329 | tsn = ntohl(data_hdr->tsn); | |
bb33381d | 6330 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
6331 | |
6332 | /* ASSERT: Now skb->data is really the user data. */ | |
6333 | ||
6334 | /* Process ECN based congestion. | |
6335 | * | |
6336 | * Since the chunk structure is reused for all chunks within | |
6337 | * a packet, we use ecn_ce_done to track if we've already | |
6338 | * done CE processing for this packet. | |
6339 | * | |
6340 | * We need to do ECN processing even if we plan to discard the | |
6341 | * chunk later. | |
6342 | */ | |
6343 | ||
2d47fd12 | 6344 | if (asoc->peer.ecn_capable && !chunk->ecn_ce_done) { |
e7487c86 | 6345 | struct sctp_af *af = SCTP_INPUT_CB(chunk->skb)->af; |
1da177e4 LT |
6346 | chunk->ecn_ce_done = 1; |
6347 | ||
2d47fd12 | 6348 | if (af->is_ce(sctp_gso_headskb(chunk->skb))) { |
1da177e4 LT |
6349 | /* Do real work as sideffect. */ |
6350 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_CE, | |
6351 | SCTP_U32(tsn)); | |
6352 | } | |
6353 | } | |
6354 | ||
6355 | tmp = sctp_tsnmap_check(&asoc->peer.tsn_map, tsn); | |
6356 | if (tmp < 0) { | |
6357 | /* The TSN is too high--silently discard the chunk and | |
6358 | * count on it getting retransmitted later. | |
6359 | */ | |
196d6759 MB |
6360 | if (chunk->asoc) |
6361 | chunk->asoc->stats.outofseqtsns++; | |
1da177e4 LT |
6362 | return SCTP_IERROR_HIGH_TSN; |
6363 | } else if (tmp > 0) { | |
6364 | /* This is a duplicate. Record it. */ | |
6365 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_DUP, SCTP_U32(tsn)); | |
6366 | return SCTP_IERROR_DUP_TSN; | |
6367 | } | |
6368 | ||
6369 | /* This is a new TSN. */ | |
6370 | ||
6371 | /* Discard if there is no room in the receive window. | |
6372 | * Actually, allow a little bit of overflow (up to a MTU). | |
6373 | */ | |
6374 | datalen = ntohs(chunk->chunk_hdr->length); | |
9d4ceaf1 | 6375 | datalen -= sctp_datachk_len(&asoc->stream); |
1da177e4 LT |
6376 | |
6377 | deliver = SCTP_CMD_CHUNK_ULP; | |
6378 | ||
6379 | /* Think about partial delivery. */ | |
6380 | if ((datalen >= asoc->rwnd) && (!asoc->ulpq.pd_mode)) { | |
6381 | ||
6382 | /* Even if we don't accept this chunk there is | |
6383 | * memory pressure. | |
6384 | */ | |
6385 | sctp_add_cmd_sf(commands, SCTP_CMD_PART_DELIVER, SCTP_NULL()); | |
6386 | } | |
6387 | ||
d808ad9a | 6388 | /* Spill over rwnd a little bit. Note: While allowed, this spill over |
1da177e4 LT |
6389 | * seems a bit troublesome in that frag_point varies based on |
6390 | * PMTU. In cases, such as loopback, this might be a rather | |
6391 | * large spill over. | |
4d93df0a | 6392 | */ |
362d5204 | 6393 | if ((!chunk->data_accepted) && (!asoc->rwnd || asoc->rwnd_over || |
4d93df0a | 6394 | (datalen > asoc->rwnd + asoc->frag_point))) { |
1da177e4 LT |
6395 | |
6396 | /* If this is the next TSN, consider reneging to make | |
6397 | * room. Note: Playing nice with a confused sender. A | |
6398 | * malicious sender can still eat up all our buffer | |
6399 | * space and in the future we may want to detect and | |
6400 | * do more drastic reneging. | |
6401 | */ | |
7c3ceb4f NH |
6402 | if (sctp_tsnmap_has_gap(map) && |
6403 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { | |
bb33381d | 6404 | pr_debug("%s: reneging for tsn:%u\n", __func__, tsn); |
1da177e4 LT |
6405 | deliver = SCTP_CMD_RENEGE; |
6406 | } else { | |
bb33381d DB |
6407 | pr_debug("%s: discard tsn:%u len:%zu, rwnd:%d\n", |
6408 | __func__, tsn, datalen, asoc->rwnd); | |
6409 | ||
1da177e4 LT |
6410 | return SCTP_IERROR_IGNORE_TSN; |
6411 | } | |
6412 | } | |
6413 | ||
4d93df0a NH |
6414 | /* |
6415 | * Also try to renege to limit our memory usage in the event that | |
6416 | * we are under memory pressure | |
3ab224be | 6417 | * If we can't renege, don't worry about it, the sk_rmem_schedule |
4d93df0a NH |
6418 | * in sctp_ulpevent_make_rcvmsg will drop the frame if we grow our |
6419 | * memory usage too much | |
6420 | */ | |
9dde27de | 6421 | if (sk_under_memory_pressure(sk)) { |
4d93df0a | 6422 | if (sctp_tsnmap_has_gap(map) && |
f7010e61 | 6423 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { |
bb33381d DB |
6424 | pr_debug("%s: under pressure, reneging for tsn:%u\n", |
6425 | __func__, tsn); | |
4d93df0a | 6426 | deliver = SCTP_CMD_RENEGE; |
9dde27de XL |
6427 | } else { |
6428 | sk_mem_reclaim(sk); | |
6429 | } | |
4d93df0a NH |
6430 | } |
6431 | ||
1da177e4 LT |
6432 | /* |
6433 | * Section 3.3.10.9 No User Data (9) | |
6434 | * | |
6435 | * Cause of error | |
6436 | * --------------- | |
6437 | * No User Data: This error cause is returned to the originator of a | |
6438 | * DATA chunk if a received DATA chunk has no user data. | |
6439 | */ | |
6440 | if (unlikely(0 == datalen)) { | |
6441 | err = sctp_make_abort_no_data(asoc, chunk, tsn); | |
6442 | if (err) { | |
6443 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6444 | SCTP_CHUNK(err)); | |
6445 | } | |
6446 | /* We are going to ABORT, so we might as well stop | |
6447 | * processing the rest of the chunks in the packet. | |
6448 | */ | |
cb3f837b | 6449 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 SS |
6450 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6451 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 | 6452 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6453 | SCTP_PERR(SCTP_ERROR_NO_DATA)); |
b01a2407 EB |
6454 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6455 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
6456 | return SCTP_IERROR_NO_DATA; |
6457 | } | |
6458 | ||
9faa730f SS |
6459 | chunk->data_accepted = 1; |
6460 | ||
1da177e4 LT |
6461 | /* Note: Some chunks may get overcounted (if we drop) or overcounted |
6462 | * if we renege and the chunk arrives again. | |
6463 | */ | |
196d6759 | 6464 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
b01a2407 | 6465 | SCTP_INC_STATS(net, SCTP_MIB_INUNORDERCHUNKS); |
196d6759 MB |
6466 | if (chunk->asoc) |
6467 | chunk->asoc->stats.iuodchunks++; | |
6468 | } else { | |
b01a2407 | 6469 | SCTP_INC_STATS(net, SCTP_MIB_INORDERCHUNKS); |
196d6759 MB |
6470 | if (chunk->asoc) |
6471 | chunk->asoc->stats.iodchunks++; | |
f1751c57 | 6472 | } |
1da177e4 LT |
6473 | |
6474 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
6475 | * | |
6476 | * If an endpoint receive a DATA chunk with an invalid stream | |
6477 | * identifier, it shall acknowledge the reception of the DATA chunk | |
6478 | * following the normal procedure, immediately send an ERROR chunk | |
6479 | * with cause set to "Invalid Stream Identifier" (See Section 3.3.10) | |
6480 | * and discard the DATA chunk. | |
6481 | */ | |
9d4ceaf1 | 6482 | if (ntohs(data_hdr->stream) >= asoc->stream.incnt) { |
3888e9ef VY |
6483 | /* Mark tsn as received even though we drop it */ |
6484 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_TSN, SCTP_U32(tsn)); | |
6485 | ||
1da177e4 LT |
6486 | err = sctp_make_op_error(asoc, chunk, SCTP_ERROR_INV_STRM, |
6487 | &data_hdr->stream, | |
6383cfb3 VY |
6488 | sizeof(data_hdr->stream), |
6489 | sizeof(u16)); | |
1da177e4 LT |
6490 | if (err) |
6491 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6492 | SCTP_CHUNK(err)); | |
6493 | return SCTP_IERROR_BAD_STREAM; | |
6494 | } | |
6495 | ||
f1751c57 VY |
6496 | /* Check to see if the SSN is possible for this TSN. |
6497 | * The biggest gap we can record is 4K wide. Since SSNs wrap | |
6498 | * at an unsigned short, there is no way that an SSN can | |
6499 | * wrap and for a valid TSN. We can simply check if the current | |
6500 | * SSN is smaller then the next expected one. If it is, it wrapped | |
6501 | * and is invalid. | |
6502 | */ | |
9d4ceaf1 | 6503 | if (!asoc->stream.si->validate_data(chunk)) |
f1751c57 | 6504 | return SCTP_IERROR_PROTO_VIOLATION; |
f1751c57 | 6505 | |
1da177e4 LT |
6506 | /* Send the data up to the user. Note: Schedule the |
6507 | * SCTP_CMD_CHUNK_ULP cmd before the SCTP_CMD_GEN_SACK, as the SACK | |
6508 | * chunk needs the updated rwnd. | |
6509 | */ | |
6510 | sctp_add_cmd_sf(commands, deliver, SCTP_CHUNK(chunk)); | |
6511 | ||
6512 | return SCTP_IERROR_NO_ERROR; | |
6513 | } |