Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001-2002 Intel Corp. | |
6 | * Copyright (c) 2002 Nokia Corp. | |
7 | * | |
60c778b2 | 8 | * This is part of the SCTP Linux Kernel Implementation. |
1da177e4 LT |
9 | * |
10 | * These are the state functions for the state machine. | |
11 | * | |
60c778b2 | 12 | * This SCTP implementation is free software; |
1da177e4 LT |
13 | * you can redistribute it and/or modify it under the terms of |
14 | * the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2, or (at your option) | |
16 | * any later version. | |
17 | * | |
60c778b2 | 18 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
19 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
20 | * ************************ | |
21 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
22 | * See the GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
4b2f13a2 JK |
25 | * along with GNU CC; see the file COPYING. If not, see |
26 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
27 | * |
28 | * Please send any bug reports or fixes you make to the | |
29 | * email address(es): | |
91705c61 | 30 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 31 | * |
1da177e4 LT |
32 | * Written or modified by: |
33 | * La Monte H.P. Yarroll <piggy@acm.org> | |
34 | * Karl Knutson <karl@athena.chicago.il.us> | |
35 | * Mathew Kotowsky <kotowsky@sctp.org> | |
36 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
37 | * Jon Grimm <jgrimm@us.ibm.com> | |
38 | * Hui Huang <hui.huang@nokia.com> | |
39 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
40 | * Daisy Chang <daisyc@us.ibm.com> | |
41 | * Ardelle Fan <ardelle.fan@intel.com> | |
42 | * Ryan Layer <rmlayer@us.ibm.com> | |
43 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
44 | */ |
45 | ||
145ce502 JP |
46 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
47 | ||
1da177e4 LT |
48 | #include <linux/types.h> |
49 | #include <linux/kernel.h> | |
50 | #include <linux/ip.h> | |
51 | #include <linux/ipv6.h> | |
52 | #include <linux/net.h> | |
53 | #include <linux/inet.h> | |
5a0e3ad6 | 54 | #include <linux/slab.h> |
1da177e4 LT |
55 | #include <net/sock.h> |
56 | #include <net/inet_ecn.h> | |
57 | #include <linux/skbuff.h> | |
58 | #include <net/sctp/sctp.h> | |
59 | #include <net/sctp/sm.h> | |
60 | #include <net/sctp/structs.h> | |
61 | ||
103d750c MH |
62 | #define CREATE_TRACE_POINTS |
63 | #include <trace/events/sctp.h> | |
64 | ||
172a1599 XL |
65 | static struct sctp_packet *sctp_abort_pkt_new( |
66 | struct net *net, | |
67 | const struct sctp_endpoint *ep, | |
68 | const struct sctp_association *asoc, | |
69 | struct sctp_chunk *chunk, | |
70 | const void *payload, size_t paylen); | |
1da177e4 LT |
71 | static int sctp_eat_data(const struct sctp_association *asoc, |
72 | struct sctp_chunk *chunk, | |
a85bbeb2 | 73 | struct sctp_cmd_seq *commands); |
172a1599 XL |
74 | static struct sctp_packet *sctp_ootb_pkt_new( |
75 | struct net *net, | |
76 | const struct sctp_association *asoc, | |
77 | const struct sctp_chunk *chunk); | |
24cb81a6 EB |
78 | static void sctp_send_stale_cookie_err(struct net *net, |
79 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
80 | const struct sctp_association *asoc, |
81 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 82 | struct sctp_cmd_seq *commands, |
1da177e4 | 83 | struct sctp_chunk *err_chunk); |
172a1599 XL |
84 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
85 | struct net *net, | |
86 | const struct sctp_endpoint *ep, | |
87 | const struct sctp_association *asoc, | |
88 | const union sctp_subtype type, | |
89 | void *arg, | |
90 | struct sctp_cmd_seq *commands); | |
91 | static enum sctp_disposition sctp_sf_shut_8_4_5( | |
92 | struct net *net, | |
93 | const struct sctp_endpoint *ep, | |
94 | const struct sctp_association *asoc, | |
95 | const union sctp_subtype type, | |
96 | void *arg, | |
97 | struct sctp_cmd_seq *commands); | |
98 | static enum sctp_disposition sctp_sf_tabort_8_4_8( | |
99 | struct net *net, | |
24cb81a6 | 100 | const struct sctp_endpoint *ep, |
ece25dfa | 101 | const struct sctp_association *asoc, |
bfc6f827 | 102 | const union sctp_subtype type, |
ece25dfa | 103 | void *arg, |
a85bbeb2 | 104 | struct sctp_cmd_seq *commands); |
1da177e4 LT |
105 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk); |
106 | ||
172a1599 XL |
107 | static enum sctp_disposition sctp_stop_t1_and_abort( |
108 | struct net *net, | |
109 | struct sctp_cmd_seq *commands, | |
110 | __be16 error, int sk_err, | |
111 | const struct sctp_association *asoc, | |
112 | struct sctp_transport *transport); | |
52c1da39 | 113 | |
172a1599 XL |
114 | static enum sctp_disposition sctp_sf_abort_violation( |
115 | struct net *net, | |
116 | const struct sctp_endpoint *ep, | |
117 | const struct sctp_association *asoc, | |
118 | void *arg, | |
119 | struct sctp_cmd_seq *commands, | |
120 | const __u8 *payload, | |
121 | const size_t paylen); | |
aecedeab | 122 | |
172a1599 XL |
123 | static enum sctp_disposition sctp_sf_violation_chunklen( |
124 | struct net *net, | |
125 | const struct sctp_endpoint *ep, | |
126 | const struct sctp_association *asoc, | |
127 | const union sctp_subtype type, | |
128 | void *arg, | |
129 | struct sctp_cmd_seq *commands); | |
1da177e4 | 130 | |
172a1599 XL |
131 | static enum sctp_disposition sctp_sf_violation_paramlen( |
132 | struct net *net, | |
133 | const struct sctp_endpoint *ep, | |
134 | const struct sctp_association *asoc, | |
135 | const union sctp_subtype type, | |
136 | void *arg, void *ext, | |
137 | struct sctp_cmd_seq *commands); | |
6f4c618d | 138 | |
172a1599 XL |
139 | static enum sctp_disposition sctp_sf_violation_ctsn( |
140 | struct net *net, | |
141 | const struct sctp_endpoint *ep, | |
142 | const struct sctp_association *asoc, | |
143 | const union sctp_subtype type, | |
144 | void *arg, | |
145 | struct sctp_cmd_seq *commands); | |
aecedeab | 146 | |
172a1599 XL |
147 | static enum sctp_disposition sctp_sf_violation_chunk( |
148 | struct net *net, | |
149 | const struct sctp_endpoint *ep, | |
150 | const struct sctp_association *asoc, | |
151 | const union sctp_subtype type, | |
152 | void *arg, | |
153 | struct sctp_cmd_seq *commands); | |
ece25dfa | 154 | |
4785c7ae | 155 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 XL |
156 | struct net *net, |
157 | const struct sctp_endpoint *ep, | |
158 | const struct sctp_association *asoc, | |
159 | const union sctp_subtype type, | |
160 | struct sctp_chunk *chunk); | |
bbd0d598 | 161 | |
172a1599 XL |
162 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
163 | struct net *net, | |
24cb81a6 | 164 | const struct sctp_endpoint *ep, |
75205f47 | 165 | const struct sctp_association *asoc, |
bfc6f827 | 166 | const union sctp_subtype type, |
75205f47 | 167 | void *arg, |
a85bbeb2 | 168 | struct sctp_cmd_seq *commands); |
75205f47 | 169 | |
1da177e4 LT |
170 | /* Small helper function that checks if the chunk length |
171 | * is of the appropriate length. The 'required_length' argument | |
172 | * is set to be the size of a specific chunk we are testing. | |
509e7a31 MRL |
173 | * Return Values: true = Valid length |
174 | * false = Invalid length | |
1da177e4 LT |
175 | * |
176 | */ | |
172a1599 XL |
177 | static inline bool sctp_chunk_length_valid(struct sctp_chunk *chunk, |
178 | __u16 required_length) | |
1da177e4 LT |
179 | { |
180 | __u16 chunk_length = ntohs(chunk->chunk_hdr->length); | |
181 | ||
26b87c78 DB |
182 | /* Previously already marked? */ |
183 | if (unlikely(chunk->pdiscard)) | |
509e7a31 | 184 | return false; |
1da177e4 | 185 | if (unlikely(chunk_length < required_length)) |
509e7a31 | 186 | return false; |
1da177e4 | 187 | |
509e7a31 | 188 | return true; |
1da177e4 LT |
189 | } |
190 | ||
191 | /********************************************************** | |
192 | * These are the state functions for handling chunk events. | |
193 | **********************************************************/ | |
194 | ||
195 | /* | |
196 | * Process the final SHUTDOWN COMPLETE. | |
197 | * | |
198 | * Section: 4 (C) (diagram), 9.2 | |
199 | * Upon reception of the SHUTDOWN COMPLETE chunk the endpoint will verify | |
200 | * that it is in SHUTDOWN-ACK-SENT state, if it is not the chunk should be | |
201 | * discarded. If the endpoint is in the SHUTDOWN-ACK-SENT state the endpoint | |
202 | * should stop the T2-shutdown timer and remove all knowledge of the | |
203 | * association (and thus the association enters the CLOSED state). | |
204 | * | |
047a2428 | 205 | * Verification Tag: 8.5.1(C), sctpimpguide 2.41. |
1da177e4 LT |
206 | * C) Rules for packet carrying SHUTDOWN COMPLETE: |
207 | * ... | |
047a2428 JF |
208 | * - The receiver of a SHUTDOWN COMPLETE shall accept the packet |
209 | * if the Verification Tag field of the packet matches its own tag and | |
210 | * the T bit is not set | |
211 | * OR | |
212 | * it is set to its peer's tag and the T bit is set in the Chunk | |
213 | * Flags. | |
214 | * Otherwise, the receiver MUST silently discard the packet | |
215 | * and take no further action. An endpoint MUST ignore the | |
216 | * SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state. | |
1da177e4 LT |
217 | * |
218 | * Inputs | |
219 | * (endpoint, asoc, chunk) | |
220 | * | |
221 | * Outputs | |
222 | * (asoc, reply_msg, msg_up, timers, counters) | |
223 | * | |
224 | * The return value is the disposition of the chunk. | |
225 | */ | |
172a1599 XL |
226 | enum sctp_disposition sctp_sf_do_4_C(struct net *net, |
227 | const struct sctp_endpoint *ep, | |
228 | const struct sctp_association *asoc, | |
229 | const union sctp_subtype type, | |
230 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
231 | { |
232 | struct sctp_chunk *chunk = arg; | |
233 | struct sctp_ulpevent *ev; | |
234 | ||
ece25dfa | 235 | if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6 | 236 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
ece25dfa | 237 | |
1da177e4 LT |
238 | /* RFC 2960 6.10 Bundling |
239 | * | |
240 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
241 | * SHUTDOWN COMPLETE with any other chunks. | |
242 | */ | |
243 | if (!chunk->singleton) | |
24cb81a6 | 244 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 245 | |
ece25dfa | 246 | /* Make sure that the SHUTDOWN_COMPLETE chunk has a valid length. */ |
922dbc5b | 247 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 248 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 249 | commands); |
1da177e4 LT |
250 | |
251 | /* RFC 2960 10.2 SCTP-to-ULP | |
252 | * | |
253 | * H) SHUTDOWN COMPLETE notification | |
254 | * | |
255 | * When SCTP completes the shutdown procedures (section 9.2) this | |
256 | * notification is passed to the upper layer. | |
257 | */ | |
258 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 259 | 0, 0, 0, NULL, GFP_ATOMIC); |
df7deeb5 VY |
260 | if (ev) |
261 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
d808ad9a | 262 | SCTP_ULPEVENT(ev)); |
1da177e4 LT |
263 | |
264 | /* Upon reception of the SHUTDOWN COMPLETE chunk the endpoint | |
265 | * will verify that it is in SHUTDOWN-ACK-SENT state, if it is | |
266 | * not the chunk should be discarded. If the endpoint is in | |
267 | * the SHUTDOWN-ACK-SENT state the endpoint should stop the | |
268 | * T2-shutdown timer and remove all knowledge of the | |
269 | * association (and thus the association enters the CLOSED | |
270 | * state). | |
271 | */ | |
272 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
273 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
274 | ||
275 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
276 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
277 | ||
278 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
279 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
280 | ||
b01a2407 EB |
281 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
282 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
283 | |
284 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
285 | ||
286 | return SCTP_DISPOSITION_DELETE_TCB; | |
1da177e4 LT |
287 | } |
288 | ||
289 | /* | |
290 | * Respond to a normal INIT chunk. | |
291 | * We are the side that is being asked for an association. | |
292 | * | |
293 | * Section: 5.1 Normal Establishment of an Association, B | |
294 | * B) "Z" shall respond immediately with an INIT ACK chunk. The | |
295 | * destination IP address of the INIT ACK MUST be set to the source | |
296 | * IP address of the INIT to which this INIT ACK is responding. In | |
297 | * the response, besides filling in other parameters, "Z" must set the | |
298 | * Verification Tag field to Tag_A, and also provide its own | |
299 | * Verification Tag (Tag_Z) in the Initiate Tag field. | |
300 | * | |
d808ad9a | 301 | * Verification Tag: Must be 0. |
1da177e4 LT |
302 | * |
303 | * Inputs | |
304 | * (endpoint, asoc, chunk) | |
305 | * | |
306 | * Outputs | |
307 | * (asoc, reply_msg, msg_up, timers, counters) | |
308 | * | |
309 | * The return value is the disposition of the chunk. | |
310 | */ | |
172a1599 XL |
311 | enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net, |
312 | const struct sctp_endpoint *ep, | |
313 | const struct sctp_association *asoc, | |
314 | const union sctp_subtype type, | |
315 | void *arg, | |
316 | struct sctp_cmd_seq *commands) | |
1da177e4 | 317 | { |
62e6b7e4 XL |
318 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
319 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 320 | struct sctp_association *new_asoc; |
1da177e4 | 321 | struct sctp_packet *packet; |
1da177e4 LT |
322 | int len; |
323 | ||
2277c7cd RH |
324 | /* Update socket peer label if first association. */ |
325 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
326 | chunk->skb)) | |
327 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
328 | ||
1da177e4 LT |
329 | /* 6.10 Bundling |
330 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
331 | * SHUTDOWN COMPLETE with any other chunks. | |
d808ad9a | 332 | * |
1da177e4 LT |
333 | * IG Section 2.11.2 |
334 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
335 | * enforce these rules by silently discarding an arriving packet | |
336 | * with an INIT chunk that is bundled with other chunks. | |
337 | */ | |
338 | if (!chunk->singleton) | |
24cb81a6 | 339 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
340 | |
341 | /* If the packet is an OOTB packet which is temporarily on the | |
342 | * control endpoint, respond with an ABORT. | |
343 | */ | |
2ce95503 | 344 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 345 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 346 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 347 | } |
1da177e4 | 348 | |
1da177e4 | 349 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification |
d808ad9a | 350 | * Tag. |
1da177e4 LT |
351 | */ |
352 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 353 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
354 | |
355 | /* Make sure that the INIT chunk has a valid length. | |
356 | * Normally, this would cause an ABORT with a Protocol Violation | |
357 | * error, but since we don't have an association, we'll | |
358 | * just discard the packet. | |
359 | */ | |
01a992be | 360 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 361 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 362 | |
bec9640b VY |
363 | /* If the INIT is coming toward a closing socket, we'll send back |
364 | * and ABORT. Essentially, this catches the race of INIT being | |
365 | * backloged to the socket at the same time as the user isses close(). | |
366 | * Since the socket and all its associations are going away, we | |
367 | * can treat this OOTB | |
368 | */ | |
369 | if (sctp_sstate(ep->base.sk, CLOSING)) | |
24cb81a6 | 370 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
bec9640b | 371 | |
1da177e4 LT |
372 | /* Verify the INIT chunk before processing it. */ |
373 | err_chunk = NULL; | |
b14878cc | 374 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 375 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
376 | &err_chunk)) { |
377 | /* This chunk contains fatal error. It is to be discarded. | |
378 | * Send an ABORT, with causes if there is any. | |
379 | */ | |
380 | if (err_chunk) { | |
24cb81a6 | 381 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 382 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 383 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 384 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 385 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
386 | |
387 | sctp_chunk_free(err_chunk); | |
388 | ||
389 | if (packet) { | |
390 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
391 | SCTP_PACKET(packet)); | |
b01a2407 | 392 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
393 | return SCTP_DISPOSITION_CONSUME; |
394 | } else { | |
395 | return SCTP_DISPOSITION_NOMEM; | |
396 | } | |
397 | } else { | |
24cb81a6 | 398 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
399 | commands); |
400 | } | |
401 | } | |
402 | ||
d808ad9a | 403 | /* Grab the INIT header. */ |
4ae70c08 | 404 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
405 | |
406 | /* Tag the variable length parameters. */ | |
4ae70c08 | 407 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
408 | |
409 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
410 | if (!new_asoc) | |
411 | goto nomem; | |
412 | ||
409b95af VY |
413 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
414 | sctp_scope(sctp_source(chunk)), | |
415 | GFP_ATOMIC) < 0) | |
416 | goto nomem_init; | |
417 | ||
1da177e4 | 418 | /* The call, sctp_process_init(), can fail on memory allocation. */ |
de6becdc | 419 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 420 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
1da177e4 LT |
421 | GFP_ATOMIC)) |
422 | goto nomem_init; | |
423 | ||
1da177e4 LT |
424 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ |
425 | ||
426 | /* If there are errors need to be reported for unknown parameters, | |
427 | * make sure to reserve enough room in the INIT ACK for them. | |
428 | */ | |
429 | len = 0; | |
430 | if (err_chunk) | |
431 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 432 | sizeof(struct sctp_chunkhdr); |
1da177e4 | 433 | |
1da177e4 LT |
434 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
435 | if (!repl) | |
df7deeb5 | 436 | goto nomem_init; |
1da177e4 LT |
437 | |
438 | /* If there are errors need to be reported for unknown parameters, | |
439 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
440 | * parameter. | |
441 | */ | |
442 | if (err_chunk) { | |
443 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
444 | * ERROR chunk generated by sctp_verify_init(). Since the | |
445 | * error cause code for "unknown parameter" and the | |
446 | * "Unrecognized parameter" type is the same, we can | |
447 | * construct the parameters in INIT ACK by copying the | |
448 | * ERROR causes over. | |
449 | */ | |
62e6b7e4 | 450 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 451 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 452 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
453 | /* Replace the cause code with the "Unrecognized parameter" |
454 | * parameter type. | |
455 | */ | |
456 | sctp_addto_chunk(repl, len, unk_param); | |
457 | sctp_chunk_free(err_chunk); | |
458 | } | |
459 | ||
df7deeb5 VY |
460 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); |
461 | ||
1da177e4 LT |
462 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
463 | ||
464 | /* | |
465 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
466 | * "Z" MUST NOT allocate any resources, nor keep any states for the | |
467 | * new association. Otherwise, "Z" will be vulnerable to resource | |
468 | * attacks. | |
469 | */ | |
470 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
471 | ||
472 | return SCTP_DISPOSITION_DELETE_TCB; | |
473 | ||
1da177e4 LT |
474 | nomem_init: |
475 | sctp_association_free(new_asoc); | |
476 | nomem: | |
df7deeb5 VY |
477 | if (err_chunk) |
478 | sctp_chunk_free(err_chunk); | |
1da177e4 LT |
479 | return SCTP_DISPOSITION_NOMEM; |
480 | } | |
481 | ||
482 | /* | |
483 | * Respond to a normal INIT ACK chunk. | |
484 | * We are the side that is initiating the association. | |
485 | * | |
486 | * Section: 5.1 Normal Establishment of an Association, C | |
487 | * C) Upon reception of the INIT ACK from "Z", "A" shall stop the T1-init | |
488 | * timer and leave COOKIE-WAIT state. "A" shall then send the State | |
489 | * Cookie received in the INIT ACK chunk in a COOKIE ECHO chunk, start | |
490 | * the T1-cookie timer, and enter the COOKIE-ECHOED state. | |
491 | * | |
492 | * Note: The COOKIE ECHO chunk can be bundled with any pending outbound | |
493 | * DATA chunks, but it MUST be the first chunk in the packet and | |
494 | * until the COOKIE ACK is returned the sender MUST NOT send any | |
495 | * other packets to the peer. | |
496 | * | |
497 | * Verification Tag: 3.3.3 | |
498 | * If the value of the Initiate Tag in a received INIT ACK chunk is | |
499 | * found to be 0, the receiver MUST treat it as an error and close the | |
500 | * association by transmitting an ABORT. | |
501 | * | |
502 | * Inputs | |
503 | * (endpoint, asoc, chunk) | |
504 | * | |
505 | * Outputs | |
506 | * (asoc, reply_msg, msg_up, timers, counters) | |
507 | * | |
508 | * The return value is the disposition of the chunk. | |
509 | */ | |
172a1599 XL |
510 | enum sctp_disposition sctp_sf_do_5_1C_ack(struct net *net, |
511 | const struct sctp_endpoint *ep, | |
512 | const struct sctp_association *asoc, | |
513 | const union sctp_subtype type, | |
514 | void *arg, | |
515 | struct sctp_cmd_seq *commands) | |
1da177e4 | 516 | { |
01a992be | 517 | struct sctp_init_chunk *initchunk; |
172a1599 | 518 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
519 | struct sctp_chunk *err_chunk; |
520 | struct sctp_packet *packet; | |
1da177e4 LT |
521 | |
522 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 523 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 524 | |
1da177e4 LT |
525 | /* 6.10 Bundling |
526 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
527 | * SHUTDOWN COMPLETE with any other chunks. | |
528 | */ | |
529 | if (!chunk->singleton) | |
24cb81a6 | 530 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 531 | |
ece25dfa | 532 | /* Make sure that the INIT-ACK chunk has a valid length */ |
cb1844c4 | 533 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_initack_chunk))) |
24cb81a6 | 534 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 535 | commands); |
1da177e4 | 536 | /* Grab the INIT header. */ |
4ae70c08 | 537 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 | 538 | |
1da177e4 LT |
539 | /* Verify the INIT chunk before processing it. */ |
540 | err_chunk = NULL; | |
b14878cc | 541 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 542 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
543 | &err_chunk)) { |
544 | ||
2a493216 | 545 | enum sctp_error error = SCTP_ERROR_NO_RESOURCE; |
853f4b50 | 546 | |
1da177e4 | 547 | /* This chunk contains fatal error. It is to be discarded. |
d6701191 VY |
548 | * Send an ABORT, with causes. If there are no causes, |
549 | * then there wasn't enough memory. Just terminate | |
550 | * the association. | |
1da177e4 LT |
551 | */ |
552 | if (err_chunk) { | |
24cb81a6 | 553 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 554 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 555 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 556 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 557 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
558 | |
559 | sctp_chunk_free(err_chunk); | |
560 | ||
561 | if (packet) { | |
562 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
563 | SCTP_PACKET(packet)); | |
24cb81a6 | 564 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
8de8c873 | 565 | error = SCTP_ERROR_INV_PARAM; |
1da177e4 | 566 | } |
1da177e4 | 567 | } |
bbd0d598 VY |
568 | |
569 | /* SCTP-AUTH, Section 6.3: | |
570 | * It should be noted that if the receiver wants to tear | |
571 | * down an association in an authenticated way only, the | |
572 | * handling of malformed packets should not result in | |
573 | * tearing down the association. | |
574 | * | |
575 | * This means that if we only want to abort associations | |
576 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 577 | * can't destroy this association just because the packet |
bbd0d598 VY |
578 | * was malformed. |
579 | */ | |
580 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
24cb81a6 | 581 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 | 582 | |
24cb81a6 EB |
583 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
584 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, | |
8de8c873 | 585 | asoc, chunk->transport); |
1da177e4 LT |
586 | } |
587 | ||
588 | /* Tag the variable length parameters. Note that we never | |
589 | * convert the parameters in an INIT chunk. | |
590 | */ | |
4ae70c08 | 591 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 | 592 | |
01a992be | 593 | initchunk = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
594 | |
595 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_INIT, | |
596 | SCTP_PEER_INIT(initchunk)); | |
597 | ||
3f7a87d2 FF |
598 | /* Reset init error count upon receipt of INIT-ACK. */ |
599 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); | |
600 | ||
1da177e4 LT |
601 | /* 5.1 C) "A" shall stop the T1-init timer and leave |
602 | * COOKIE-WAIT state. "A" shall then ... start the T1-cookie | |
603 | * timer, and enter the COOKIE-ECHOED state. | |
604 | */ | |
605 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
606 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
607 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
608 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
609 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
610 | SCTP_STATE(SCTP_STATE_COOKIE_ECHOED)); | |
611 | ||
730fc3d0 VY |
612 | /* SCTP-AUTH: genereate the assocition shared keys so that |
613 | * we can potentially signe the COOKIE-ECHO. | |
614 | */ | |
615 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_SHKEY, SCTP_NULL()); | |
616 | ||
1da177e4 LT |
617 | /* 5.1 C) "A" shall then send the State Cookie received in the |
618 | * INIT ACK chunk in a COOKIE ECHO chunk, ... | |
619 | */ | |
620 | /* If there is any errors to report, send the ERROR chunk generated | |
621 | * for unknown parameters as well. | |
622 | */ | |
623 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_COOKIE_ECHO, | |
624 | SCTP_CHUNK(err_chunk)); | |
625 | ||
626 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
627 | } |
628 | ||
629 | /* | |
630 | * Respond to a normal COOKIE ECHO chunk. | |
631 | * We are the side that is being asked for an association. | |
632 | * | |
633 | * Section: 5.1 Normal Establishment of an Association, D | |
634 | * D) Upon reception of the COOKIE ECHO chunk, Endpoint "Z" will reply | |
635 | * with a COOKIE ACK chunk after building a TCB and moving to | |
636 | * the ESTABLISHED state. A COOKIE ACK chunk may be bundled with | |
637 | * any pending DATA chunks (and/or SACK chunks), but the COOKIE ACK | |
638 | * chunk MUST be the first chunk in the packet. | |
639 | * | |
640 | * IMPLEMENTATION NOTE: An implementation may choose to send the | |
641 | * Communication Up notification to the SCTP user upon reception | |
642 | * of a valid COOKIE ECHO chunk. | |
643 | * | |
644 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
645 | * D) Rules for packet carrying a COOKIE ECHO | |
646 | * | |
647 | * - When sending a COOKIE ECHO, the endpoint MUST use the value of the | |
648 | * Initial Tag received in the INIT ACK. | |
649 | * | |
650 | * - The receiver of a COOKIE ECHO follows the procedures in Section 5. | |
651 | * | |
652 | * Inputs | |
653 | * (endpoint, asoc, chunk) | |
654 | * | |
655 | * Outputs | |
656 | * (asoc, reply_msg, msg_up, timers, counters) | |
657 | * | |
658 | * The return value is the disposition of the chunk. | |
659 | */ | |
172a1599 XL |
660 | enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net, |
661 | const struct sctp_endpoint *ep, | |
662 | const struct sctp_association *asoc, | |
663 | const union sctp_subtype type, | |
664 | void *arg, | |
665 | struct sctp_cmd_seq *commands) | |
1da177e4 | 666 | { |
30f6ebf6 | 667 | struct sctp_ulpevent *ev, *ai_ev = NULL, *auth_ev = NULL; |
1da177e4 | 668 | struct sctp_association *new_asoc; |
01a992be | 669 | struct sctp_init_chunk *peer_init; |
172a1599 | 670 | struct sctp_chunk *chunk = arg; |
1da177e4 | 671 | struct sctp_chunk *err_chk_p; |
172a1599 | 672 | struct sctp_chunk *repl; |
609ee467 | 673 | struct sock *sk; |
172a1599 | 674 | int error = 0; |
1da177e4 LT |
675 | |
676 | /* If the packet is an OOTB packet which is temporarily on the | |
677 | * control endpoint, respond with an ABORT. | |
678 | */ | |
2ce95503 | 679 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 680 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 681 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 682 | } |
1da177e4 LT |
683 | |
684 | /* Make sure that the COOKIE_ECHO chunk has a valid length. | |
685 | * In this case, we check that we have enough for at least a | |
686 | * chunk header. More detailed verification is done | |
687 | * in sctp_unpack_cookie(). | |
688 | */ | |
922dbc5b | 689 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 690 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 691 | |
609ee467 VY |
692 | /* If the endpoint is not listening or if the number of associations |
693 | * on the TCP-style socket exceed the max backlog, respond with an | |
694 | * ABORT. | |
695 | */ | |
696 | sk = ep->base.sk; | |
697 | if (!sctp_sstate(sk, LISTENING) || | |
698 | (sctp_style(sk, TCP) && sk_acceptq_is_full(sk))) | |
24cb81a6 | 699 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
609ee467 | 700 | |
1da177e4 LT |
701 | /* "Decode" the chunk. We have no optional parameters so we |
702 | * are in good shape. | |
703 | */ | |
d808ad9a | 704 | chunk->subh.cookie_hdr = |
1da177e4 | 705 | (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 706 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 707 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 708 | goto nomem; |
1da177e4 LT |
709 | |
710 | /* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint | |
711 | * "Z" will reply with a COOKIE ACK chunk after building a TCB | |
712 | * and moving to the ESTABLISHED state. | |
713 | */ | |
714 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
715 | &err_chk_p); | |
716 | ||
717 | /* FIXME: | |
718 | * If the re-build failed, what is the proper error path | |
719 | * from here? | |
720 | * | |
721 | * [We should abort the association. --piggy] | |
722 | */ | |
723 | if (!new_asoc) { | |
724 | /* FIXME: Several errors are possible. A bad cookie should | |
725 | * be silently discarded, but think about logging it too. | |
726 | */ | |
727 | switch (error) { | |
728 | case -SCTP_IERROR_NOMEM: | |
729 | goto nomem; | |
730 | ||
731 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 732 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 733 | err_chk_p); |
24cb81a6 | 734 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
735 | |
736 | case -SCTP_IERROR_BAD_SIG: | |
737 | default: | |
24cb81a6 | 738 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 739 | } |
1da177e4 LT |
740 | } |
741 | ||
1da177e4 | 742 | |
df7deeb5 VY |
743 | /* Delay state machine commands until later. |
744 | * | |
745 | * Re-build the bind address for the association is done in | |
1da177e4 LT |
746 | * the sctp_unpack_cookie() already. |
747 | */ | |
748 | /* This is a brand-new association, so these are not yet side | |
749 | * effects--it is safe to run them here. | |
750 | */ | |
751 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
752 | ||
de6becdc | 753 | if (!sctp_process_init(new_asoc, chunk, |
6a1e5f33 | 754 | &chunk->subh.cookie_hdr->c.peer_addr, |
1da177e4 LT |
755 | peer_init, GFP_ATOMIC)) |
756 | goto nomem_init; | |
757 | ||
730fc3d0 VY |
758 | /* SCTP-AUTH: Now that we've populate required fields in |
759 | * sctp_process_init, set up the assocaition shared keys as | |
760 | * necessary so that we can potentially authenticate the ACK | |
761 | */ | |
762 | error = sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC); | |
763 | if (error) | |
764 | goto nomem_init; | |
765 | ||
bbd0d598 VY |
766 | /* SCTP-AUTH: auth_chunk pointer is only set when the cookie-echo |
767 | * is supposed to be authenticated and we have to do delayed | |
768 | * authentication. We've just recreated the association using | |
769 | * the information in the cookie and now it's much easier to | |
770 | * do the authentication. | |
771 | */ | |
772 | if (chunk->auth_chunk) { | |
773 | struct sctp_chunk auth; | |
4785c7ae | 774 | enum sctp_ierror ret; |
bbd0d598 | 775 | |
ec0223ec DB |
776 | /* Make sure that we and the peer are AUTH capable */ |
777 | if (!net->sctp.auth_enable || !new_asoc->peer.auth_capable) { | |
ec0223ec DB |
778 | sctp_association_free(new_asoc); |
779 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
780 | } | |
781 | ||
bbd0d598 VY |
782 | /* set-up our fake chunk so that we can process it */ |
783 | auth.skb = chunk->auth_chunk; | |
784 | auth.asoc = chunk->asoc; | |
785 | auth.sctp_hdr = chunk->sctp_hdr; | |
922dbc5b XL |
786 | auth.chunk_hdr = (struct sctp_chunkhdr *) |
787 | skb_push(chunk->auth_chunk, | |
788 | sizeof(struct sctp_chunkhdr)); | |
789 | skb_pull(chunk->auth_chunk, sizeof(struct sctp_chunkhdr)); | |
bbd0d598 VY |
790 | auth.transport = chunk->transport; |
791 | ||
24cb81a6 | 792 | ret = sctp_sf_authenticate(net, ep, new_asoc, type, &auth); |
bbd0d598 VY |
793 | if (ret != SCTP_IERROR_NO_ERROR) { |
794 | sctp_association_free(new_asoc); | |
24cb81a6 | 795 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 VY |
796 | } |
797 | } | |
798 | ||
1da177e4 LT |
799 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
800 | if (!repl) | |
df7deeb5 | 801 | goto nomem_init; |
1da177e4 LT |
802 | |
803 | /* RFC 2960 5.1 Normal Establishment of an Association | |
804 | * | |
805 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
806 | * send the Communication Up notification to the SCTP user | |
807 | * upon reception of a valid COOKIE ECHO chunk. | |
808 | */ | |
809 | ev = sctp_ulpevent_make_assoc_change(new_asoc, 0, SCTP_COMM_UP, 0, | |
810 | new_asoc->c.sinit_num_ostreams, | |
811 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 812 | NULL, GFP_ATOMIC); |
1da177e4 LT |
813 | if (!ev) |
814 | goto nomem_ev; | |
815 | ||
d808ad9a | 816 | /* Sockets API Draft Section 5.3.1.6 |
0f3fffd8 | 817 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 818 | * delivers this notification to inform the application that of the |
0f3fffd8 | 819 | * peers requested adaptation layer. |
1da177e4 | 820 | */ |
0f3fffd8 ISJ |
821 | if (new_asoc->peer.adaptation_ind) { |
822 | ai_ev = sctp_ulpevent_make_adaptation_indication(new_asoc, | |
1da177e4 | 823 | GFP_ATOMIC); |
df7deeb5 VY |
824 | if (!ai_ev) |
825 | goto nomem_aiev; | |
826 | } | |
827 | ||
30f6ebf6 XL |
828 | if (!new_asoc->peer.auth_capable) { |
829 | auth_ev = sctp_ulpevent_make_authkey(new_asoc, 0, | |
830 | SCTP_AUTH_NO_AUTH, | |
831 | GFP_ATOMIC); | |
832 | if (!auth_ev) | |
833 | goto nomem_authev; | |
834 | } | |
835 | ||
df7deeb5 VY |
836 | /* Add all the state machine commands now since we've created |
837 | * everything. This way we don't introduce memory corruptions | |
838 | * during side-effect processing and correclty count established | |
839 | * associations. | |
840 | */ | |
841 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
842 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
843 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
844 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
845 | SCTP_INC_STATS(net, SCTP_MIB_PASSIVEESTABS); | |
df7deeb5 VY |
846 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
847 | ||
9f70f46b | 848 | if (new_asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
df7deeb5 VY |
849 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
850 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
851 | ||
df7deeb5 VY |
852 | /* This will send the COOKIE ACK */ |
853 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
854 | ||
855 | /* Queue the ASSOC_CHANGE event */ | |
856 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
857 | ||
858 | /* Send up the Adaptation Layer Indication event */ | |
859 | if (ai_ev) | |
1da177e4 | 860 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
df7deeb5 | 861 | SCTP_ULPEVENT(ai_ev)); |
1da177e4 | 862 | |
30f6ebf6 XL |
863 | if (auth_ev) |
864 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
865 | SCTP_ULPEVENT(auth_ev)); | |
866 | ||
1da177e4 LT |
867 | return SCTP_DISPOSITION_CONSUME; |
868 | ||
30f6ebf6 XL |
869 | nomem_authev: |
870 | sctp_ulpevent_free(ai_ev); | |
df7deeb5 VY |
871 | nomem_aiev: |
872 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
873 | nomem_ev: |
874 | sctp_chunk_free(repl); | |
1da177e4 LT |
875 | nomem_init: |
876 | sctp_association_free(new_asoc); | |
877 | nomem: | |
878 | return SCTP_DISPOSITION_NOMEM; | |
879 | } | |
880 | ||
881 | /* | |
882 | * Respond to a normal COOKIE ACK chunk. | |
b52effd2 | 883 | * We are the side that is asking for an association. |
1da177e4 LT |
884 | * |
885 | * RFC 2960 5.1 Normal Establishment of an Association | |
886 | * | |
887 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move from the | |
888 | * COOKIE-ECHOED state to the ESTABLISHED state, stopping the T1-cookie | |
889 | * timer. It may also notify its ULP about the successful | |
890 | * establishment of the association with a Communication Up | |
891 | * notification (see Section 10). | |
892 | * | |
893 | * Verification Tag: | |
894 | * Inputs | |
895 | * (endpoint, asoc, chunk) | |
896 | * | |
897 | * Outputs | |
898 | * (asoc, reply_msg, msg_up, timers, counters) | |
899 | * | |
900 | * The return value is the disposition of the chunk. | |
901 | */ | |
172a1599 XL |
902 | enum sctp_disposition sctp_sf_do_5_1E_ca(struct net *net, |
903 | const struct sctp_endpoint *ep, | |
904 | const struct sctp_association *asoc, | |
905 | const union sctp_subtype type, | |
906 | void *arg, | |
907 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
908 | { |
909 | struct sctp_chunk *chunk = arg; | |
910 | struct sctp_ulpevent *ev; | |
911 | ||
912 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 913 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
914 | |
915 | /* Verify that the chunk length for the COOKIE-ACK is OK. | |
916 | * If we don't do this, any bundled chunks may be junked. | |
917 | */ | |
922dbc5b | 918 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 919 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
920 | commands); |
921 | ||
922 | /* Reset init error count upon receipt of COOKIE-ACK, | |
923 | * to avoid problems with the managemement of this | |
924 | * counter in stale cookie situations when a transition back | |
925 | * from the COOKIE-ECHOED state to the COOKIE-WAIT | |
926 | * state is performed. | |
927 | */ | |
3f7a87d2 | 928 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); |
1da177e4 | 929 | |
2277c7cd RH |
930 | /* Set peer label for connection. */ |
931 | security_inet_conn_established(ep->base.sk, chunk->skb); | |
932 | ||
1da177e4 LT |
933 | /* RFC 2960 5.1 Normal Establishment of an Association |
934 | * | |
935 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move | |
936 | * from the COOKIE-ECHOED state to the ESTABLISHED state, | |
937 | * stopping the T1-cookie timer. | |
938 | */ | |
939 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
940 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
941 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
942 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
943 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
944 | SCTP_INC_STATS(net, SCTP_MIB_ACTIVEESTABS); | |
1da177e4 | 945 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
9f70f46b | 946 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
947 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
948 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
1da177e4 LT |
949 | |
950 | /* It may also notify its ULP about the successful | |
951 | * establishment of the association with a Communication Up | |
952 | * notification (see Section 10). | |
953 | */ | |
954 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_UP, | |
955 | 0, asoc->c.sinit_num_ostreams, | |
956 | asoc->c.sinit_max_instreams, | |
a5a35e76 | 957 | NULL, GFP_ATOMIC); |
1da177e4 LT |
958 | |
959 | if (!ev) | |
960 | goto nomem; | |
961 | ||
962 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
963 | ||
964 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 965 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 966 | * delivers this notification to inform the application that of the |
0f3fffd8 | 967 | * peers requested adaptation layer. |
1da177e4 | 968 | */ |
0f3fffd8 ISJ |
969 | if (asoc->peer.adaptation_ind) { |
970 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1da177e4 LT |
971 | if (!ev) |
972 | goto nomem; | |
973 | ||
974 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
975 | SCTP_ULPEVENT(ev)); | |
976 | } | |
977 | ||
30f6ebf6 XL |
978 | if (!asoc->peer.auth_capable) { |
979 | ev = sctp_ulpevent_make_authkey(asoc, 0, SCTP_AUTH_NO_AUTH, | |
980 | GFP_ATOMIC); | |
981 | if (!ev) | |
982 | goto nomem; | |
983 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
984 | SCTP_ULPEVENT(ev)); | |
985 | } | |
986 | ||
1da177e4 LT |
987 | return SCTP_DISPOSITION_CONSUME; |
988 | nomem: | |
989 | return SCTP_DISPOSITION_NOMEM; | |
990 | } | |
991 | ||
992 | /* Generate and sendout a heartbeat packet. */ | |
172a1599 XL |
993 | static enum sctp_disposition sctp_sf_heartbeat( |
994 | const struct sctp_endpoint *ep, | |
995 | const struct sctp_association *asoc, | |
996 | const union sctp_subtype type, | |
997 | void *arg, | |
998 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
999 | { |
1000 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
1001 | struct sctp_chunk *reply; | |
1da177e4 LT |
1002 | |
1003 | /* Send a heartbeat to our peer. */ | |
92c73af5 | 1004 | reply = sctp_make_heartbeat(asoc, transport); |
1da177e4 LT |
1005 | if (!reply) |
1006 | return SCTP_DISPOSITION_NOMEM; | |
1007 | ||
1008 | /* Set rto_pending indicating that an RTT measurement | |
1009 | * is started with this heartbeat chunk. | |
1010 | */ | |
1011 | sctp_add_cmd_sf(commands, SCTP_CMD_RTO_PENDING, | |
1012 | SCTP_TRANSPORT(transport)); | |
1013 | ||
1014 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1015 | return SCTP_DISPOSITION_CONSUME; | |
1016 | } | |
1017 | ||
1018 | /* Generate a HEARTBEAT packet on the given transport. */ | |
172a1599 XL |
1019 | enum sctp_disposition sctp_sf_sendbeat_8_3(struct net *net, |
1020 | const struct sctp_endpoint *ep, | |
1021 | const struct sctp_association *asoc, | |
1022 | const union sctp_subtype type, | |
1023 | void *arg, | |
1024 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1025 | { |
1026 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
1027 | ||
b9f84786 | 1028 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
1029 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
1030 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
1031 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
1032 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 1033 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
1034 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1035 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
1036 | return SCTP_DISPOSITION_DELETE_TCB; |
1037 | } | |
1038 | ||
1039 | /* Section 3.3.5. | |
1040 | * The Sender-specific Heartbeat Info field should normally include | |
1041 | * information about the sender's current time when this HEARTBEAT | |
1042 | * chunk is sent and the destination transport address to which this | |
1043 | * HEARTBEAT is sent (see Section 8.3). | |
1044 | */ | |
1045 | ||
52ccb8e9 | 1046 | if (transport->param_flags & SPP_HB_ENABLE) { |
1da177e4 LT |
1047 | if (SCTP_DISPOSITION_NOMEM == |
1048 | sctp_sf_heartbeat(ep, asoc, type, arg, | |
1049 | commands)) | |
1050 | return SCTP_DISPOSITION_NOMEM; | |
245cba7e | 1051 | |
1da177e4 LT |
1052 | /* Set transport error counter and association error counter |
1053 | * when sending heartbeat. | |
1054 | */ | |
7e99013a | 1055 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
1da177e4 LT |
1056 | SCTP_TRANSPORT(transport)); |
1057 | } | |
245cba7e VY |
1058 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_IDLE, |
1059 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
1060 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMER_UPDATE, |
1061 | SCTP_TRANSPORT(transport)); | |
1062 | ||
d808ad9a | 1063 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1064 | } |
1065 | ||
7b9438de | 1066 | /* resend asoc strreset_chunk. */ |
172a1599 XL |
1067 | enum sctp_disposition sctp_sf_send_reconf(struct net *net, |
1068 | const struct sctp_endpoint *ep, | |
1069 | const struct sctp_association *asoc, | |
1070 | const union sctp_subtype type, | |
1071 | void *arg, | |
1072 | struct sctp_cmd_seq *commands) | |
7b9438de XL |
1073 | { |
1074 | struct sctp_transport *transport = arg; | |
1075 | ||
1076 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
1077 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
1078 | SCTP_ERROR(ETIMEDOUT)); | |
1079 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
1080 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
1081 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
1082 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
1083 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1084 | return SCTP_DISPOSITION_DELETE_TCB; | |
1085 | } | |
1086 | ||
1087 | sctp_chunk_hold(asoc->strreset_chunk); | |
1088 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1089 | SCTP_CHUNK(asoc->strreset_chunk)); | |
1090 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
1091 | ||
1092 | return SCTP_DISPOSITION_CONSUME; | |
1093 | } | |
1094 | ||
1da177e4 LT |
1095 | /* |
1096 | * Process an heartbeat request. | |
1097 | * | |
1098 | * Section: 8.3 Path Heartbeat | |
1099 | * The receiver of the HEARTBEAT should immediately respond with a | |
1100 | * HEARTBEAT ACK that contains the Heartbeat Information field copied | |
1101 | * from the received HEARTBEAT chunk. | |
1102 | * | |
1103 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1104 | * When receiving an SCTP packet, the endpoint MUST ensure that the | |
1105 | * value in the Verification Tag field of the received SCTP packet | |
1106 | * matches its own Tag. If the received Verification Tag value does not | |
1107 | * match the receiver's own tag value, the receiver shall silently | |
1108 | * discard the packet and shall not process it any further except for | |
1109 | * those cases listed in Section 8.5.1 below. | |
1110 | * | |
1111 | * Inputs | |
1112 | * (endpoint, asoc, chunk) | |
1113 | * | |
1114 | * Outputs | |
1115 | * (asoc, reply_msg, msg_up, timers, counters) | |
1116 | * | |
1117 | * The return value is the disposition of the chunk. | |
1118 | */ | |
172a1599 XL |
1119 | enum sctp_disposition sctp_sf_beat_8_3(struct net *net, |
1120 | const struct sctp_endpoint *ep, | |
1121 | const struct sctp_association *asoc, | |
1122 | const union sctp_subtype type, | |
1123 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 1124 | { |
3c918704 | 1125 | struct sctp_paramhdr *param_hdr; |
1da177e4 LT |
1126 | struct sctp_chunk *chunk = arg; |
1127 | struct sctp_chunk *reply; | |
1128 | size_t paylen = 0; | |
1129 | ||
1130 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1131 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1132 | |
1133 | /* Make sure that the HEARTBEAT chunk has a valid length. */ | |
38c00f74 XL |
1134 | if (!sctp_chunk_length_valid(chunk, |
1135 | sizeof(struct sctp_heartbeat_chunk))) | |
24cb81a6 | 1136 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1137 | commands); |
1138 | ||
1139 | /* 8.3 The receiver of the HEARTBEAT should immediately | |
1140 | * respond with a HEARTBEAT ACK that contains the Heartbeat | |
1141 | * Information field copied from the received HEARTBEAT chunk. | |
1142 | */ | |
4d2dcdf4 | 1143 | chunk->subh.hb_hdr = (struct sctp_heartbeathdr *)chunk->skb->data; |
3c918704 | 1144 | param_hdr = (struct sctp_paramhdr *)chunk->subh.hb_hdr; |
922dbc5b | 1145 | paylen = ntohs(chunk->chunk_hdr->length) - sizeof(struct sctp_chunkhdr); |
06a31e2b TG |
1146 | |
1147 | if (ntohs(param_hdr->length) > paylen) | |
1148 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
1149 | param_hdr, commands); | |
1150 | ||
62b08083 SS |
1151 | if (!pskb_pull(chunk->skb, paylen)) |
1152 | goto nomem; | |
1da177e4 | 1153 | |
06a31e2b | 1154 | reply = sctp_make_heartbeat_ack(asoc, chunk, param_hdr, paylen); |
1da177e4 LT |
1155 | if (!reply) |
1156 | goto nomem; | |
1157 | ||
1158 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1159 | return SCTP_DISPOSITION_CONSUME; | |
1160 | ||
1161 | nomem: | |
1162 | return SCTP_DISPOSITION_NOMEM; | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Process the returning HEARTBEAT ACK. | |
1167 | * | |
1168 | * Section: 8.3 Path Heartbeat | |
1169 | * Upon the receipt of the HEARTBEAT ACK, the sender of the HEARTBEAT | |
1170 | * should clear the error counter of the destination transport | |
1171 | * address to which the HEARTBEAT was sent, and mark the destination | |
1172 | * transport address as active if it is not so marked. The endpoint may | |
1173 | * optionally report to the upper layer when an inactive destination | |
1174 | * address is marked as active due to the reception of the latest | |
1175 | * HEARTBEAT ACK. The receiver of the HEARTBEAT ACK must also | |
1176 | * clear the association overall error count as well (as defined | |
1177 | * in section 8.1). | |
1178 | * | |
1179 | * The receiver of the HEARTBEAT ACK should also perform an RTT | |
1180 | * measurement for that destination transport address using the time | |
1181 | * value carried in the HEARTBEAT ACK chunk. | |
1182 | * | |
1183 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1184 | * | |
1185 | * Inputs | |
1186 | * (endpoint, asoc, chunk) | |
1187 | * | |
1188 | * Outputs | |
1189 | * (asoc, reply_msg, msg_up, timers, counters) | |
1190 | * | |
1191 | * The return value is the disposition of the chunk. | |
1192 | */ | |
172a1599 XL |
1193 | enum sctp_disposition sctp_sf_backbeat_8_3(struct net *net, |
1194 | const struct sctp_endpoint *ep, | |
1195 | const struct sctp_association *asoc, | |
1196 | const union sctp_subtype type, | |
1197 | void *arg, | |
1198 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1199 | { |
edf903f8 | 1200 | struct sctp_sender_hb_info *hbinfo; |
1da177e4 | 1201 | struct sctp_chunk *chunk = arg; |
1da177e4 | 1202 | struct sctp_transport *link; |
1da177e4 | 1203 | unsigned long max_interval; |
edf903f8 | 1204 | union sctp_addr from_addr; |
1da177e4 LT |
1205 | |
1206 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1207 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1208 | |
1209 | /* Make sure that the HEARTBEAT-ACK chunk has a valid length. */ | |
922dbc5b | 1210 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr) + |
edf903f8 | 1211 | sizeof(*hbinfo))) |
24cb81a6 | 1212 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1213 | commands); |
1214 | ||
edf903f8 | 1215 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
a601266e | 1216 | /* Make sure that the length of the parameter is what we expect */ |
edf903f8 | 1217 | if (ntohs(hbinfo->param_hdr.length) != sizeof(*hbinfo)) |
a601266e | 1218 | return SCTP_DISPOSITION_DISCARD; |
a601266e | 1219 | |
1da177e4 | 1220 | from_addr = hbinfo->daddr; |
63de08f4 | 1221 | link = sctp_assoc_lookup_paddr(asoc, &from_addr); |
1da177e4 LT |
1222 | |
1223 | /* This should never happen, but lets log it if so. */ | |
3f7a87d2 FF |
1224 | if (unlikely(!link)) { |
1225 | if (from_addr.sa.sa_family == AF_INET6) { | |
e87cc472 JP |
1226 | net_warn_ratelimited("%s association %p could not find address %pI6\n", |
1227 | __func__, | |
1228 | asoc, | |
1229 | &from_addr.v6.sin6_addr); | |
3f7a87d2 | 1230 | } else { |
e87cc472 JP |
1231 | net_warn_ratelimited("%s association %p could not find address %pI4\n", |
1232 | __func__, | |
1233 | asoc, | |
1234 | &from_addr.v4.sin_addr.s_addr); | |
3f7a87d2 | 1235 | } |
1da177e4 LT |
1236 | return SCTP_DISPOSITION_DISCARD; |
1237 | } | |
1238 | ||
ad8fec17 SS |
1239 | /* Validate the 64-bit random nonce. */ |
1240 | if (hbinfo->hb_nonce != link->hb_nonce) | |
1241 | return SCTP_DISPOSITION_DISCARD; | |
1242 | ||
52ccb8e9 | 1243 | max_interval = link->hbinterval + link->rto; |
1da177e4 LT |
1244 | |
1245 | /* Check if the timestamp looks valid. */ | |
1246 | if (time_after(hbinfo->sent_at, jiffies) || | |
1247 | time_after(jiffies, hbinfo->sent_at + max_interval)) { | |
bb33381d DB |
1248 | pr_debug("%s: HEARTBEAT ACK with invalid timestamp received " |
1249 | "for transport:%p\n", __func__, link); | |
1250 | ||
1da177e4 LT |
1251 | return SCTP_DISPOSITION_DISCARD; |
1252 | } | |
1253 | ||
1254 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of | |
1255 | * the HEARTBEAT should clear the error counter of the | |
1256 | * destination transport address to which the HEARTBEAT was | |
1257 | * sent and mark the destination transport address as active if | |
1258 | * it is not so marked. | |
1259 | */ | |
1260 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_ON, SCTP_TRANSPORT(link)); | |
1261 | ||
1262 | return SCTP_DISPOSITION_CONSUME; | |
1263 | } | |
1264 | ||
1265 | /* Helper function to send out an abort for the restart | |
1266 | * condition. | |
1267 | */ | |
2ce95503 | 1268 | static int sctp_sf_send_restart_abort(struct net *net, union sctp_addr *ssa, |
1da177e4 | 1269 | struct sctp_chunk *init, |
a85bbeb2 | 1270 | struct sctp_cmd_seq *commands) |
1da177e4 | 1271 | { |
172a1599 | 1272 | struct sctp_af *af = sctp_get_af_specific(ssa->v4.sin_family); |
1da177e4 LT |
1273 | union sctp_addr_param *addrparm; |
1274 | struct sctp_errhdr *errhdr; | |
d8238d9d | 1275 | char buffer[sizeof(*errhdr) + sizeof(*addrparm)]; |
172a1599 XL |
1276 | struct sctp_endpoint *ep; |
1277 | struct sctp_packet *pkt; | |
1278 | int len; | |
1da177e4 LT |
1279 | |
1280 | /* Build the error on the stack. We are way to malloc crazy | |
1281 | * throughout the code today. | |
1282 | */ | |
1283 | errhdr = (struct sctp_errhdr *)buffer; | |
1284 | addrparm = (union sctp_addr_param *)errhdr->variable; | |
1285 | ||
1286 | /* Copy into a parm format. */ | |
1287 | len = af->to_addr_param(ssa, addrparm); | |
d8238d9d | 1288 | len += sizeof(*errhdr); |
1da177e4 LT |
1289 | |
1290 | errhdr->cause = SCTP_ERROR_RESTART; | |
1291 | errhdr->length = htons(len); | |
1292 | ||
1293 | /* Assign to the control socket. */ | |
2ce95503 | 1294 | ep = sctp_sk(net->sctp.ctl_sock)->ep; |
1da177e4 LT |
1295 | |
1296 | /* Association is NULL since this may be a restart attack and we | |
1297 | * want to send back the attacker's vtag. | |
1298 | */ | |
24cb81a6 | 1299 | pkt = sctp_abort_pkt_new(net, ep, NULL, init, errhdr, len); |
1da177e4 LT |
1300 | |
1301 | if (!pkt) | |
1302 | goto out; | |
1303 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(pkt)); | |
1304 | ||
b01a2407 | 1305 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1306 | |
1307 | /* Discard the rest of the inbound packet. */ | |
1308 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); | |
1309 | ||
1310 | out: | |
1311 | /* Even if there is no memory, treat as a failure so | |
1312 | * the packet will get dropped. | |
1313 | */ | |
1314 | return 0; | |
1315 | } | |
1316 | ||
123031c0 JP |
1317 | static bool list_has_sctp_addr(const struct list_head *list, |
1318 | union sctp_addr *ipaddr) | |
1319 | { | |
1320 | struct sctp_transport *addr; | |
1321 | ||
1322 | list_for_each_entry(addr, list, transports) { | |
1323 | if (sctp_cmp_addr_exact(ipaddr, &addr->ipaddr)) | |
1324 | return true; | |
1325 | } | |
1326 | ||
1327 | return false; | |
1328 | } | |
1da177e4 LT |
1329 | /* A restart is occurring, check to make sure no new addresses |
1330 | * are being added as we may be under a takeover attack. | |
1331 | */ | |
1332 | static int sctp_sf_check_restart_addrs(const struct sctp_association *new_asoc, | |
1333 | const struct sctp_association *asoc, | |
1334 | struct sctp_chunk *init, | |
a85bbeb2 | 1335 | struct sctp_cmd_seq *commands) |
1da177e4 | 1336 | { |
2ce95503 | 1337 | struct net *net = sock_net(new_asoc->base.sk); |
123031c0 JP |
1338 | struct sctp_transport *new_addr; |
1339 | int ret = 1; | |
1da177e4 | 1340 | |
123031c0 | 1341 | /* Implementor's Guide - Section 5.2.2 |
1da177e4 LT |
1342 | * ... |
1343 | * Before responding the endpoint MUST check to see if the | |
1344 | * unexpected INIT adds new addresses to the association. If new | |
1345 | * addresses are added to the association, the endpoint MUST respond | |
1346 | * with an ABORT.. | |
1347 | */ | |
1348 | ||
1349 | /* Search through all current addresses and make sure | |
1350 | * we aren't adding any new ones. | |
1351 | */ | |
9dbc15f0 | 1352 | list_for_each_entry(new_addr, &new_asoc->peer.transport_addr_list, |
123031c0 JP |
1353 | transports) { |
1354 | if (!list_has_sctp_addr(&asoc->peer.transport_addr_list, | |
1355 | &new_addr->ipaddr)) { | |
2ce95503 | 1356 | sctp_sf_send_restart_abort(net, &new_addr->ipaddr, init, |
123031c0 JP |
1357 | commands); |
1358 | ret = 0; | |
1da177e4 | 1359 | break; |
123031c0 | 1360 | } |
1da177e4 LT |
1361 | } |
1362 | ||
1363 | /* Return success if all addresses were found. */ | |
123031c0 | 1364 | return ret; |
1da177e4 LT |
1365 | } |
1366 | ||
1367 | /* Populate the verification/tie tags based on overlapping INIT | |
1368 | * scenario. | |
1369 | * | |
1370 | * Note: Do not use in CLOSED or SHUTDOWN-ACK-SENT state. | |
1371 | */ | |
1372 | static void sctp_tietags_populate(struct sctp_association *new_asoc, | |
1373 | const struct sctp_association *asoc) | |
1374 | { | |
1375 | switch (asoc->state) { | |
1376 | ||
1377 | /* 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State */ | |
1378 | ||
1379 | case SCTP_STATE_COOKIE_WAIT: | |
1380 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1381 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1382 | new_asoc->c.peer_ttag = 0; | |
1383 | break; | |
1384 | ||
1385 | case SCTP_STATE_COOKIE_ECHOED: | |
1386 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1387 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1388 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1389 | break; | |
1390 | ||
1391 | /* 5.2.2 Unexpected INIT in States Other than CLOSED, COOKIE-ECHOED, | |
1392 | * COOKIE-WAIT and SHUTDOWN-ACK-SENT | |
1393 | */ | |
1394 | default: | |
1395 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1396 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1397 | break; | |
3ff50b79 | 1398 | } |
1da177e4 LT |
1399 | |
1400 | /* Other parameters for the endpoint SHOULD be copied from the | |
1401 | * existing parameters of the association (e.g. number of | |
1402 | * outbound streams) into the INIT ACK and cookie. | |
1403 | */ | |
1404 | new_asoc->rwnd = asoc->rwnd; | |
1405 | new_asoc->c.sinit_num_ostreams = asoc->c.sinit_num_ostreams; | |
1406 | new_asoc->c.sinit_max_instreams = asoc->c.sinit_max_instreams; | |
1407 | new_asoc->c.initial_tsn = asoc->c.initial_tsn; | |
1408 | } | |
1409 | ||
1410 | /* | |
1411 | * Compare vtag/tietag values to determine unexpected COOKIE-ECHO | |
1412 | * handling action. | |
1413 | * | |
1414 | * RFC 2960 5.2.4 Handle a COOKIE ECHO when a TCB exists. | |
1415 | * | |
1416 | * Returns value representing action to be taken. These action values | |
1417 | * correspond to Action/Description values in RFC 2960, Table 2. | |
1418 | */ | |
1419 | static char sctp_tietags_compare(struct sctp_association *new_asoc, | |
1420 | const struct sctp_association *asoc) | |
1421 | { | |
1422 | /* In this case, the peer may have restarted. */ | |
1423 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1424 | (asoc->c.peer_vtag != new_asoc->c.peer_vtag) && | |
1425 | (asoc->c.my_vtag == new_asoc->c.my_ttag) && | |
1426 | (asoc->c.peer_vtag == new_asoc->c.peer_ttag)) | |
1427 | return 'A'; | |
1428 | ||
1429 | /* Collision case B. */ | |
1430 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1431 | ((asoc->c.peer_vtag != new_asoc->c.peer_vtag) || | |
1432 | (0 == asoc->c.peer_vtag))) { | |
1433 | return 'B'; | |
1434 | } | |
1435 | ||
1436 | /* Collision case D. */ | |
1437 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1438 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag)) | |
1439 | return 'D'; | |
1440 | ||
1441 | /* Collision case C. */ | |
1442 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1443 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag) && | |
1444 | (0 == new_asoc->c.my_ttag) && | |
1445 | (0 == new_asoc->c.peer_ttag)) | |
1446 | return 'C'; | |
1447 | ||
1448 | /* No match to any of the special cases; discard this packet. */ | |
1449 | return 'E'; | |
1450 | } | |
1451 | ||
1452 | /* Common helper routine for both duplicate and simulataneous INIT | |
1453 | * chunk handling. | |
1454 | */ | |
172a1599 XL |
1455 | static enum sctp_disposition sctp_sf_do_unexpected_init( |
1456 | struct net *net, | |
1457 | const struct sctp_endpoint *ep, | |
1458 | const struct sctp_association *asoc, | |
1459 | const union sctp_subtype type, | |
1460 | void *arg, | |
1461 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1462 | { |
62e6b7e4 XL |
1463 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
1464 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 1465 | struct sctp_association *new_asoc; |
172a1599 | 1466 | enum sctp_disposition retval; |
1da177e4 | 1467 | struct sctp_packet *packet; |
1da177e4 LT |
1468 | int len; |
1469 | ||
2277c7cd RH |
1470 | /* Update socket peer label if first association. */ |
1471 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
1472 | chunk->skb)) | |
1473 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1474 | ||
1da177e4 LT |
1475 | /* 6.10 Bundling |
1476 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
1477 | * SHUTDOWN COMPLETE with any other chunks. | |
1478 | * | |
1479 | * IG Section 2.11.2 | |
1480 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
1481 | * enforce these rules by silently discarding an arriving packet | |
1482 | * with an INIT chunk that is bundled with other chunks. | |
1483 | */ | |
1484 | if (!chunk->singleton) | |
24cb81a6 | 1485 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1486 | |
1487 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification | |
d808ad9a | 1488 | * Tag. |
1da177e4 LT |
1489 | */ |
1490 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 1491 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1492 | |
1493 | /* Make sure that the INIT chunk has a valid length. | |
1494 | * In this case, we generate a protocol violation since we have | |
1495 | * an association established. | |
1496 | */ | |
01a992be | 1497 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 1498 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1499 | commands); |
1500 | /* Grab the INIT header. */ | |
4ae70c08 | 1501 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
1502 | |
1503 | /* Tag the variable length parameters. */ | |
4ae70c08 | 1504 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
1505 | |
1506 | /* Verify the INIT chunk before processing it. */ | |
1507 | err_chunk = NULL; | |
b14878cc | 1508 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 1509 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
1510 | &err_chunk)) { |
1511 | /* This chunk contains fatal error. It is to be discarded. | |
1512 | * Send an ABORT, with causes if there is any. | |
1513 | */ | |
1514 | if (err_chunk) { | |
24cb81a6 | 1515 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 1516 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1517 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 1518 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 1519 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1520 | |
1521 | if (packet) { | |
1522 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
1523 | SCTP_PACKET(packet)); | |
24cb81a6 | 1524 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1525 | retval = SCTP_DISPOSITION_CONSUME; |
1526 | } else { | |
1527 | retval = SCTP_DISPOSITION_NOMEM; | |
1528 | } | |
1529 | goto cleanup; | |
1530 | } else { | |
24cb81a6 | 1531 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
1532 | commands); |
1533 | } | |
1534 | } | |
1535 | ||
1536 | /* | |
1537 | * Other parameters for the endpoint SHOULD be copied from the | |
1538 | * existing parameters of the association (e.g. number of | |
1539 | * outbound streams) into the INIT ACK and cookie. | |
1540 | * FIXME: We are copying parameters from the endpoint not the | |
1541 | * association. | |
1542 | */ | |
1543 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
1544 | if (!new_asoc) | |
1545 | goto nomem; | |
1546 | ||
409b95af VY |
1547 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
1548 | sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0) | |
1549 | goto nomem; | |
1550 | ||
1da177e4 LT |
1551 | /* In the outbound INIT ACK the endpoint MUST copy its current |
1552 | * Verification Tag and Peers Verification tag into a reserved | |
1553 | * place (local tie-tag and per tie-tag) within the state cookie. | |
1554 | */ | |
de6becdc | 1555 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 1556 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
df7deeb5 VY |
1557 | GFP_ATOMIC)) |
1558 | goto nomem; | |
1da177e4 LT |
1559 | |
1560 | /* Make sure no new addresses are being added during the | |
1561 | * restart. Do not do this check for COOKIE-WAIT state, | |
1562 | * since there are no peer addresses to check against. | |
1563 | * Upon return an ABORT will have been sent if needed. | |
1564 | */ | |
1565 | if (!sctp_state(asoc, COOKIE_WAIT)) { | |
1566 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, | |
1567 | commands)) { | |
1568 | retval = SCTP_DISPOSITION_CONSUME; | |
df7deeb5 | 1569 | goto nomem_retval; |
1da177e4 LT |
1570 | } |
1571 | } | |
1572 | ||
1573 | sctp_tietags_populate(new_asoc, asoc); | |
1574 | ||
1575 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ | |
1576 | ||
1577 | /* If there are errors need to be reported for unknown parameters, | |
1578 | * make sure to reserve enough room in the INIT ACK for them. | |
1579 | */ | |
1580 | len = 0; | |
1581 | if (err_chunk) { | |
1582 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 1583 | sizeof(struct sctp_chunkhdr); |
1da177e4 LT |
1584 | } |
1585 | ||
1da177e4 LT |
1586 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
1587 | if (!repl) | |
1588 | goto nomem; | |
1589 | ||
1590 | /* If there are errors need to be reported for unknown parameters, | |
1591 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
1592 | * parameter. | |
1593 | */ | |
1594 | if (err_chunk) { | |
1595 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
1596 | * ERROR chunk generated by sctp_verify_init(). Since the | |
1597 | * error cause code for "unknown parameter" and the | |
1598 | * "Unrecognized parameter" type is the same, we can | |
1599 | * construct the parameters in INIT ACK by copying the | |
1600 | * ERROR causes over. | |
1601 | */ | |
62e6b7e4 | 1602 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 1603 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1604 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1605 | /* Replace the cause code with the "Unrecognized parameter" |
1606 | * parameter type. | |
1607 | */ | |
1608 | sctp_addto_chunk(repl, len, unk_param); | |
1609 | } | |
1610 | ||
1611 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
1612 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1613 | ||
1614 | /* | |
1615 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
1616 | * "Z" MUST NOT allocate any resources for this new association. | |
1617 | * Otherwise, "Z" will be vulnerable to resource attacks. | |
1618 | */ | |
1619 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
1620 | retval = SCTP_DISPOSITION_CONSUME; | |
1621 | ||
df7deeb5 VY |
1622 | return retval; |
1623 | ||
1624 | nomem: | |
1625 | retval = SCTP_DISPOSITION_NOMEM; | |
1626 | nomem_retval: | |
1627 | if (new_asoc) | |
1628 | sctp_association_free(new_asoc); | |
1da177e4 LT |
1629 | cleanup: |
1630 | if (err_chunk) | |
1631 | sctp_chunk_free(err_chunk); | |
1632 | return retval; | |
1da177e4 LT |
1633 | } |
1634 | ||
1635 | /* | |
25985edc | 1636 | * Handle simultaneous INIT. |
1da177e4 LT |
1637 | * This means we started an INIT and then we got an INIT request from |
1638 | * our peer. | |
1639 | * | |
1640 | * Section: 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State (Item B) | |
1641 | * This usually indicates an initialization collision, i.e., each | |
1642 | * endpoint is attempting, at about the same time, to establish an | |
1643 | * association with the other endpoint. | |
1644 | * | |
1645 | * Upon receipt of an INIT in the COOKIE-WAIT or COOKIE-ECHOED state, an | |
1646 | * endpoint MUST respond with an INIT ACK using the same parameters it | |
1647 | * sent in its original INIT chunk (including its Verification Tag, | |
1648 | * unchanged). These original parameters are combined with those from the | |
1649 | * newly received INIT chunk. The endpoint shall also generate a State | |
1650 | * Cookie with the INIT ACK. The endpoint uses the parameters sent in its | |
1651 | * INIT to calculate the State Cookie. | |
1652 | * | |
1653 | * After that, the endpoint MUST NOT change its state, the T1-init | |
1654 | * timer shall be left running and the corresponding TCB MUST NOT be | |
1655 | * destroyed. The normal procedures for handling State Cookies when | |
1656 | * a TCB exists will resolve the duplicate INITs to a single association. | |
1657 | * | |
1658 | * For an endpoint that is in the COOKIE-ECHOED state it MUST populate | |
1659 | * its Tie-Tags with the Tag information of itself and its peer (see | |
1660 | * section 5.2.2 for a description of the Tie-Tags). | |
1661 | * | |
1662 | * Verification Tag: Not explicit, but an INIT can not have a valid | |
1663 | * verification tag, so we skip the check. | |
1664 | * | |
1665 | * Inputs | |
1666 | * (endpoint, asoc, chunk) | |
1667 | * | |
1668 | * Outputs | |
1669 | * (asoc, reply_msg, msg_up, timers, counters) | |
1670 | * | |
1671 | * The return value is the disposition of the chunk. | |
1672 | */ | |
172a1599 XL |
1673 | enum sctp_disposition sctp_sf_do_5_2_1_siminit( |
1674 | struct net *net, | |
1675 | const struct sctp_endpoint *ep, | |
1676 | const struct sctp_association *asoc, | |
1677 | const union sctp_subtype type, | |
1678 | void *arg, | |
1679 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1680 | { |
1681 | /* Call helper to do the real work for both simulataneous and | |
1682 | * duplicate INIT chunk handling. | |
1683 | */ | |
24cb81a6 | 1684 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1685 | } |
1686 | ||
1687 | /* | |
1688 | * Handle duplicated INIT messages. These are usually delayed | |
1689 | * restransmissions. | |
1690 | * | |
1691 | * Section: 5.2.2 Unexpected INIT in States Other than CLOSED, | |
1692 | * COOKIE-ECHOED and COOKIE-WAIT | |
1693 | * | |
1694 | * Unless otherwise stated, upon reception of an unexpected INIT for | |
1695 | * this association, the endpoint shall generate an INIT ACK with a | |
1696 | * State Cookie. In the outbound INIT ACK the endpoint MUST copy its | |
1697 | * current Verification Tag and peer's Verification Tag into a reserved | |
1698 | * place within the state cookie. We shall refer to these locations as | |
1699 | * the Peer's-Tie-Tag and the Local-Tie-Tag. The outbound SCTP packet | |
1700 | * containing this INIT ACK MUST carry a Verification Tag value equal to | |
1701 | * the Initiation Tag found in the unexpected INIT. And the INIT ACK | |
1702 | * MUST contain a new Initiation Tag (randomly generated see Section | |
1703 | * 5.3.1). Other parameters for the endpoint SHOULD be copied from the | |
1704 | * existing parameters of the association (e.g. number of outbound | |
1705 | * streams) into the INIT ACK and cookie. | |
1706 | * | |
1707 | * After sending out the INIT ACK, the endpoint shall take no further | |
1708 | * actions, i.e., the existing association, including its current state, | |
1709 | * and the corresponding TCB MUST NOT be changed. | |
1710 | * | |
1711 | * Note: Only when a TCB exists and the association is not in a COOKIE- | |
1712 | * WAIT state are the Tie-Tags populated. For a normal association INIT | |
1713 | * (i.e. the endpoint is in a COOKIE-WAIT state), the Tie-Tags MUST be | |
1714 | * set to 0 (indicating that no previous TCB existed). The INIT ACK and | |
1715 | * State Cookie are populated as specified in section 5.2.1. | |
1716 | * | |
1717 | * Verification Tag: Not specified, but an INIT has no way of knowing | |
1718 | * what the verification tag could be, so we ignore it. | |
1719 | * | |
1720 | * Inputs | |
1721 | * (endpoint, asoc, chunk) | |
1722 | * | |
1723 | * Outputs | |
1724 | * (asoc, reply_msg, msg_up, timers, counters) | |
1725 | * | |
1726 | * The return value is the disposition of the chunk. | |
1727 | */ | |
172a1599 XL |
1728 | enum sctp_disposition sctp_sf_do_5_2_2_dupinit( |
1729 | struct net *net, | |
24cb81a6 | 1730 | const struct sctp_endpoint *ep, |
1da177e4 | 1731 | const struct sctp_association *asoc, |
bfc6f827 | 1732 | const union sctp_subtype type, |
1da177e4 | 1733 | void *arg, |
a85bbeb2 | 1734 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
1735 | { |
1736 | /* Call helper to do the real work for both simulataneous and | |
1737 | * duplicate INIT chunk handling. | |
1738 | */ | |
24cb81a6 | 1739 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1740 | } |
1741 | ||
1742 | ||
610ab73a VY |
1743 | /* |
1744 | * Unexpected INIT-ACK handler. | |
1745 | * | |
1746 | * Section 5.2.3 | |
1747 | * If an INIT ACK received by an endpoint in any state other than the | |
1748 | * COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk. | |
1749 | * An unexpected INIT ACK usually indicates the processing of an old or | |
1750 | * duplicated INIT chunk. | |
1751 | */ | |
172a1599 XL |
1752 | enum sctp_disposition sctp_sf_do_5_2_3_initack( |
1753 | struct net *net, | |
1754 | const struct sctp_endpoint *ep, | |
1755 | const struct sctp_association *asoc, | |
1756 | const union sctp_subtype type, | |
1757 | void *arg, | |
1758 | struct sctp_cmd_seq *commands) | |
610ab73a VY |
1759 | { |
1760 | /* Per the above section, we'll discard the chunk if we have an | |
1761 | * endpoint. If this is an OOTB INIT-ACK, treat it as such. | |
1762 | */ | |
2ce95503 | 1763 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) |
24cb81a6 | 1764 | return sctp_sf_ootb(net, ep, asoc, type, arg, commands); |
610ab73a | 1765 | else |
24cb81a6 | 1766 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
610ab73a | 1767 | } |
1da177e4 LT |
1768 | |
1769 | /* Unexpected COOKIE-ECHO handler for peer restart (Table 2, action 'A') | |
1770 | * | |
1771 | * Section 5.2.4 | |
1772 | * A) In this case, the peer may have restarted. | |
1773 | */ | |
172a1599 XL |
1774 | static enum sctp_disposition sctp_sf_do_dupcook_a( |
1775 | struct net *net, | |
24cb81a6 | 1776 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1777 | const struct sctp_association *asoc, |
1778 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1779 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1780 | struct sctp_association *new_asoc) |
1781 | { | |
01a992be | 1782 | struct sctp_init_chunk *peer_init; |
172a1599 | 1783 | enum sctp_disposition disposition; |
1da177e4 LT |
1784 | struct sctp_ulpevent *ev; |
1785 | struct sctp_chunk *repl; | |
1786 | struct sctp_chunk *err; | |
1da177e4 LT |
1787 | |
1788 | /* new_asoc is a brand-new association, so these are not yet | |
1789 | * side effects--it is safe to run them here. | |
1790 | */ | |
1791 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
1792 | ||
de6becdc | 1793 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1794 | GFP_ATOMIC)) |
1795 | goto nomem; | |
1796 | ||
4842a08f XL |
1797 | if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC)) |
1798 | goto nomem; | |
1799 | ||
1da177e4 LT |
1800 | /* Make sure no new addresses are being added during the |
1801 | * restart. Though this is a pretty complicated attack | |
1802 | * since you'd have to get inside the cookie. | |
1803 | */ | |
1804 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, commands)) { | |
1805 | return SCTP_DISPOSITION_CONSUME; | |
1806 | } | |
1807 | ||
1808 | /* If the endpoint is in the SHUTDOWN-ACK-SENT state and recognizes | |
1809 | * the peer has restarted (Action A), it MUST NOT setup a new | |
1810 | * association but instead resend the SHUTDOWN ACK and send an ERROR | |
1811 | * chunk with a "Cookie Received while Shutting Down" error cause to | |
1812 | * its peer. | |
1813 | */ | |
1814 | if (sctp_state(asoc, SHUTDOWN_ACK_SENT)) { | |
24cb81a6 | 1815 | disposition = sctp_sf_do_9_2_reshutack(net, ep, asoc, |
1da177e4 LT |
1816 | SCTP_ST_CHUNK(chunk->chunk_hdr->type), |
1817 | chunk, commands); | |
1818 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
1819 | goto nomem; | |
1820 | ||
1821 | err = sctp_make_op_error(asoc, chunk, | |
1822 | SCTP_ERROR_COOKIE_IN_SHUTDOWN, | |
6383cfb3 | 1823 | NULL, 0, 0); |
1da177e4 LT |
1824 | if (err) |
1825 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1826 | SCTP_CHUNK(err)); | |
1827 | ||
1828 | return SCTP_DISPOSITION_CONSUME; | |
1829 | } | |
1830 | ||
a000c01e WY |
1831 | /* For now, stop pending T3-rtx and SACK timers, fail any unsent/unacked |
1832 | * data. Consider the optional choice of resending of this data. | |
1da177e4 | 1833 | */ |
a000c01e WY |
1834 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); |
1835 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1836 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 LT |
1837 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_OUTQUEUE, SCTP_NULL()); |
1838 | ||
a000c01e WY |
1839 | /* Stop pending T4-rto timer, teardown ASCONF queue, ASCONF-ACK queue |
1840 | * and ASCONF-ACK cache. | |
1841 | */ | |
1842 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1843 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
1844 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_ASCONF_QUEUE, SCTP_NULL()); | |
1845 | ||
1da177e4 LT |
1846 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
1847 | if (!repl) | |
1848 | goto nomem; | |
1849 | ||
1da177e4 LT |
1850 | /* Report association restart to upper layer. */ |
1851 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_RESTART, 0, | |
1852 | new_asoc->c.sinit_num_ostreams, | |
1853 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 1854 | NULL, GFP_ATOMIC); |
1da177e4 LT |
1855 | if (!ev) |
1856 | goto nomem_ev; | |
1857 | ||
df7deeb5 VY |
1858 | /* Update the content of current association. */ |
1859 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); | |
1da177e4 | 1860 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
bdf6fa52 VY |
1861 | if (sctp_state(asoc, SHUTDOWN_PENDING) && |
1862 | (sctp_sstate(asoc->base.sk, CLOSING) || | |
1863 | sock_flag(asoc->base.sk, SOCK_DEAD))) { | |
1864 | /* if were currently in SHUTDOWN_PENDING, but the socket | |
1865 | * has been closed by user, don't transition to ESTABLISHED. | |
1866 | * Instead trigger SHUTDOWN bundled with COOKIE_ACK. | |
1867 | */ | |
1868 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1869 | return sctp_sf_do_9_2_start_shutdown(net, ep, asoc, | |
1870 | SCTP_ST_CHUNK(0), NULL, | |
1871 | commands); | |
1872 | } else { | |
1873 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1874 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
1875 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1876 | } | |
1da177e4 LT |
1877 | return SCTP_DISPOSITION_CONSUME; |
1878 | ||
1879 | nomem_ev: | |
1880 | sctp_chunk_free(repl); | |
1881 | nomem: | |
1882 | return SCTP_DISPOSITION_NOMEM; | |
1883 | } | |
1884 | ||
1885 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'B') | |
1886 | * | |
1887 | * Section 5.2.4 | |
1888 | * B) In this case, both sides may be attempting to start an association | |
1889 | * at about the same time but the peer endpoint started its INIT | |
1890 | * after responding to the local endpoint's INIT | |
1891 | */ | |
1892 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1893 | static enum sctp_disposition sctp_sf_do_dupcook_b( |
1894 | struct net *net, | |
24cb81a6 | 1895 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1896 | const struct sctp_association *asoc, |
1897 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1898 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1899 | struct sctp_association *new_asoc) |
1900 | { | |
01a992be | 1901 | struct sctp_init_chunk *peer_init; |
1da177e4 LT |
1902 | struct sctp_chunk *repl; |
1903 | ||
1904 | /* new_asoc is a brand-new association, so these are not yet | |
1905 | * side effects--it is safe to run them here. | |
1906 | */ | |
1907 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
de6becdc | 1908 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1909 | GFP_ATOMIC)) |
1910 | goto nomem; | |
1911 | ||
4842a08f XL |
1912 | if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC)) |
1913 | goto nomem; | |
1914 | ||
1da177e4 LT |
1915 | /* Update the content of current association. */ |
1916 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); | |
1917 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1918 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 1919 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
1920 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
1921 | ||
1922 | repl = sctp_make_cookie_ack(new_asoc, chunk); | |
1923 | if (!repl) | |
1924 | goto nomem; | |
1925 | ||
1926 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1da177e4 LT |
1927 | |
1928 | /* RFC 2960 5.1 Normal Establishment of an Association | |
1929 | * | |
1930 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
1931 | * send the Communication Up notification to the SCTP user | |
1932 | * upon reception of a valid COOKIE ECHO chunk. | |
07d93967 VY |
1933 | * |
1934 | * Sadly, this needs to be implemented as a side-effect, because | |
1935 | * we are not guaranteed to have set the association id of the real | |
1936 | * association and so these notifications need to be delayed until | |
1937 | * the association id is allocated. | |
1da177e4 | 1938 | */ |
1da177e4 | 1939 | |
07d93967 | 1940 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_CHANGE, SCTP_U8(SCTP_COMM_UP)); |
1da177e4 LT |
1941 | |
1942 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 1943 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 1944 | * delivers this notification to inform the application that of the |
0f3fffd8 | 1945 | * peers requested adaptation layer. |
07d93967 VY |
1946 | * |
1947 | * This also needs to be done as a side effect for the same reason as | |
1948 | * above. | |
1da177e4 | 1949 | */ |
07d93967 VY |
1950 | if (asoc->peer.adaptation_ind) |
1951 | sctp_add_cmd_sf(commands, SCTP_CMD_ADAPTATION_IND, SCTP_NULL()); | |
1da177e4 | 1952 | |
30f6ebf6 XL |
1953 | if (!asoc->peer.auth_capable) |
1954 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_NO_AUTH, SCTP_NULL()); | |
1955 | ||
1da177e4 LT |
1956 | return SCTP_DISPOSITION_CONSUME; |
1957 | ||
1da177e4 LT |
1958 | nomem: |
1959 | return SCTP_DISPOSITION_NOMEM; | |
1960 | } | |
1961 | ||
1962 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'C') | |
1963 | * | |
1964 | * Section 5.2.4 | |
1965 | * C) In this case, the local endpoint's cookie has arrived late. | |
1966 | * Before it arrived, the local endpoint sent an INIT and received an | |
1967 | * INIT-ACK and finally sent a COOKIE ECHO with the peer's same tag | |
1968 | * but a new tag of its own. | |
1969 | */ | |
1970 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1971 | static enum sctp_disposition sctp_sf_do_dupcook_c( |
1972 | struct net *net, | |
24cb81a6 | 1973 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1974 | const struct sctp_association *asoc, |
1975 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1976 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1977 | struct sctp_association *new_asoc) |
1978 | { | |
1979 | /* The cookie should be silently discarded. | |
1980 | * The endpoint SHOULD NOT change states and should leave | |
1981 | * any timers running. | |
1982 | */ | |
1983 | return SCTP_DISPOSITION_DISCARD; | |
1984 | } | |
1985 | ||
1986 | /* Unexpected COOKIE-ECHO handler lost chunk (Table 2, action 'D') | |
1987 | * | |
1988 | * Section 5.2.4 | |
1989 | * | |
1990 | * D) When both local and remote tags match the endpoint should always | |
1991 | * enter the ESTABLISHED state, if it has not already done so. | |
1992 | */ | |
1993 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1994 | static enum sctp_disposition sctp_sf_do_dupcook_d( |
1995 | struct net *net, | |
24cb81a6 | 1996 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1997 | const struct sctp_association *asoc, |
1998 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1999 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
2000 | struct sctp_association *new_asoc) |
2001 | { | |
30f6ebf6 | 2002 | struct sctp_ulpevent *ev = NULL, *ai_ev = NULL, *auth_ev = NULL; |
1da177e4 LT |
2003 | struct sctp_chunk *repl; |
2004 | ||
2005 | /* Clarification from Implementor's Guide: | |
2006 | * D) When both local and remote tags match the endpoint should | |
d808ad9a YH |
2007 | * enter the ESTABLISHED state, if it is in the COOKIE-ECHOED state. |
2008 | * It should stop any cookie timer that may be running and send | |
2009 | * a COOKIE ACK. | |
1da177e4 LT |
2010 | */ |
2011 | ||
2012 | /* Don't accidentally move back into established state. */ | |
2013 | if (asoc->state < SCTP_STATE_ESTABLISHED) { | |
2014 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2015 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2016 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2017 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 2018 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
2019 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, |
2020 | SCTP_NULL()); | |
2021 | ||
2022 | /* RFC 2960 5.1 Normal Establishment of an Association | |
2023 | * | |
2024 | * D) IMPLEMENTATION NOTE: An implementation may choose | |
2025 | * to send the Communication Up notification to the | |
2026 | * SCTP user upon reception of a valid COOKIE | |
2027 | * ECHO chunk. | |
2028 | */ | |
df7deeb5 | 2029 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, |
1da177e4 | 2030 | SCTP_COMM_UP, 0, |
df7deeb5 VY |
2031 | asoc->c.sinit_num_ostreams, |
2032 | asoc->c.sinit_max_instreams, | |
9cbcbf4e | 2033 | NULL, GFP_ATOMIC); |
1da177e4 LT |
2034 | if (!ev) |
2035 | goto nomem; | |
1da177e4 LT |
2036 | |
2037 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 2038 | * When a peer sends a Adaptation Layer Indication parameter, |
1da177e4 | 2039 | * SCTP delivers this notification to inform the application |
0f3fffd8 | 2040 | * that of the peers requested adaptation layer. |
1da177e4 | 2041 | */ |
0f3fffd8 ISJ |
2042 | if (asoc->peer.adaptation_ind) { |
2043 | ai_ev = sctp_ulpevent_make_adaptation_indication(asoc, | |
1da177e4 | 2044 | GFP_ATOMIC); |
df7deeb5 | 2045 | if (!ai_ev) |
1da177e4 LT |
2046 | goto nomem; |
2047 | ||
1da177e4 | 2048 | } |
30f6ebf6 XL |
2049 | |
2050 | if (!asoc->peer.auth_capable) { | |
2051 | auth_ev = sctp_ulpevent_make_authkey(asoc, 0, | |
2052 | SCTP_AUTH_NO_AUTH, | |
2053 | GFP_ATOMIC); | |
2054 | if (!auth_ev) | |
2055 | goto nomem; | |
2056 | } | |
1da177e4 | 2057 | } |
1da177e4 | 2058 | |
46e16d4b | 2059 | repl = sctp_make_cookie_ack(asoc, chunk); |
1da177e4 LT |
2060 | if (!repl) |
2061 | goto nomem; | |
2062 | ||
2e3216cd VY |
2063 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
2064 | ||
df7deeb5 VY |
2065 | if (ev) |
2066 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2067 | SCTP_ULPEVENT(ev)); | |
2068 | if (ai_ev) | |
2069 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2070 | SCTP_ULPEVENT(ai_ev)); | |
30f6ebf6 XL |
2071 | if (auth_ev) |
2072 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2073 | SCTP_ULPEVENT(auth_ev)); | |
df7deeb5 | 2074 | |
1da177e4 LT |
2075 | return SCTP_DISPOSITION_CONSUME; |
2076 | ||
2077 | nomem: | |
30f6ebf6 XL |
2078 | if (auth_ev) |
2079 | sctp_ulpevent_free(auth_ev); | |
df7deeb5 VY |
2080 | if (ai_ev) |
2081 | sctp_ulpevent_free(ai_ev); | |
1da177e4 LT |
2082 | if (ev) |
2083 | sctp_ulpevent_free(ev); | |
2084 | return SCTP_DISPOSITION_NOMEM; | |
2085 | } | |
2086 | ||
2087 | /* | |
2088 | * Handle a duplicate COOKIE-ECHO. This usually means a cookie-carrying | |
2089 | * chunk was retransmitted and then delayed in the network. | |
2090 | * | |
2091 | * Section: 5.2.4 Handle a COOKIE ECHO when a TCB exists | |
2092 | * | |
2093 | * Verification Tag: None. Do cookie validation. | |
2094 | * | |
2095 | * Inputs | |
2096 | * (endpoint, asoc, chunk) | |
2097 | * | |
2098 | * Outputs | |
2099 | * (asoc, reply_msg, msg_up, timers, counters) | |
2100 | * | |
2101 | * The return value is the disposition of the chunk. | |
2102 | */ | |
172a1599 XL |
2103 | enum sctp_disposition sctp_sf_do_5_2_4_dupcook( |
2104 | struct net *net, | |
24cb81a6 | 2105 | const struct sctp_endpoint *ep, |
1da177e4 | 2106 | const struct sctp_association *asoc, |
bfc6f827 | 2107 | const union sctp_subtype type, |
1da177e4 | 2108 | void *arg, |
a85bbeb2 | 2109 | struct sctp_cmd_seq *commands) |
1da177e4 | 2110 | { |
1da177e4 | 2111 | struct sctp_association *new_asoc; |
172a1599 XL |
2112 | struct sctp_chunk *chunk = arg; |
2113 | enum sctp_disposition retval; | |
2114 | struct sctp_chunk *err_chk_p; | |
1da177e4 LT |
2115 | int error = 0; |
2116 | char action; | |
1da177e4 LT |
2117 | |
2118 | /* Make sure that the chunk has a valid length from the protocol | |
2119 | * perspective. In this case check to make sure we have at least | |
2120 | * enough for the chunk header. Cookie length verification is | |
2121 | * done later. | |
2122 | */ | |
922dbc5b | 2123 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2124 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2125 | commands); |
2126 | ||
2127 | /* "Decode" the chunk. We have no optional parameters so we | |
2128 | * are in good shape. | |
2129 | */ | |
d808ad9a | 2130 | chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 2131 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 2132 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 2133 | goto nomem; |
1da177e4 LT |
2134 | |
2135 | /* In RFC 2960 5.2.4 3, if both Verification Tags in the State Cookie | |
2136 | * of a duplicate COOKIE ECHO match the Verification Tags of the | |
2137 | * current association, consider the State Cookie valid even if | |
2138 | * the lifespan is exceeded. | |
2139 | */ | |
2140 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
2141 | &err_chk_p); | |
2142 | ||
2143 | /* FIXME: | |
2144 | * If the re-build failed, what is the proper error path | |
2145 | * from here? | |
2146 | * | |
2147 | * [We should abort the association. --piggy] | |
2148 | */ | |
2149 | if (!new_asoc) { | |
2150 | /* FIXME: Several errors are possible. A bad cookie should | |
2151 | * be silently discarded, but think about logging it too. | |
2152 | */ | |
2153 | switch (error) { | |
2154 | case -SCTP_IERROR_NOMEM: | |
2155 | goto nomem; | |
2156 | ||
2157 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 2158 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 2159 | err_chk_p); |
24cb81a6 | 2160 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2161 | case -SCTP_IERROR_BAD_SIG: |
2162 | default: | |
24cb81a6 | 2163 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 2164 | } |
1da177e4 LT |
2165 | } |
2166 | ||
2277c7cd RH |
2167 | /* Update socket peer label if first association. */ |
2168 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
2169 | chunk->skb)) | |
2170 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2171 | ||
7e062977 XL |
2172 | /* Set temp so that it won't be added into hashtable */ |
2173 | new_asoc->temp = 1; | |
2174 | ||
1da177e4 LT |
2175 | /* Compare the tie_tag in cookie with the verification tag of |
2176 | * current association. | |
2177 | */ | |
2178 | action = sctp_tietags_compare(new_asoc, asoc); | |
2179 | ||
2180 | switch (action) { | |
2181 | case 'A': /* Association restart. */ | |
24cb81a6 | 2182 | retval = sctp_sf_do_dupcook_a(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2183 | new_asoc); |
2184 | break; | |
2185 | ||
2186 | case 'B': /* Collision case B. */ | |
24cb81a6 | 2187 | retval = sctp_sf_do_dupcook_b(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2188 | new_asoc); |
2189 | break; | |
2190 | ||
2191 | case 'C': /* Collision case C. */ | |
24cb81a6 | 2192 | retval = sctp_sf_do_dupcook_c(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2193 | new_asoc); |
2194 | break; | |
2195 | ||
2196 | case 'D': /* Collision case D. */ | |
24cb81a6 | 2197 | retval = sctp_sf_do_dupcook_d(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2198 | new_asoc); |
2199 | break; | |
2200 | ||
2201 | default: /* Discard packet for all others. */ | |
24cb81a6 | 2202 | retval = sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2203 | break; |
3ff50b79 | 2204 | } |
1da177e4 LT |
2205 | |
2206 | /* Delete the tempory new association. */ | |
f2815633 | 2207 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, SCTP_ASOC(new_asoc)); |
1da177e4 LT |
2208 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
2209 | ||
d5ccd496 MM |
2210 | /* Restore association pointer to provide SCTP command interpeter |
2211 | * with a valid context in case it needs to manipulate | |
2212 | * the queues */ | |
2213 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, | |
2214 | SCTP_ASOC((struct sctp_association *)asoc)); | |
2215 | ||
1da177e4 LT |
2216 | return retval; |
2217 | ||
2218 | nomem: | |
2219 | return SCTP_DISPOSITION_NOMEM; | |
2220 | } | |
2221 | ||
2222 | /* | |
2223 | * Process an ABORT. (SHUTDOWN-PENDING state) | |
2224 | * | |
2225 | * See sctp_sf_do_9_1_abort(). | |
2226 | */ | |
172a1599 XL |
2227 | enum sctp_disposition sctp_sf_shutdown_pending_abort( |
2228 | struct net *net, | |
2229 | const struct sctp_endpoint *ep, | |
2230 | const struct sctp_association *asoc, | |
2231 | const union sctp_subtype type, | |
2232 | void *arg, | |
2233 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2234 | { |
2235 | struct sctp_chunk *chunk = arg; | |
2236 | ||
2237 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2238 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2239 | |
2240 | /* Make sure that the ABORT chunk has a valid length. | |
2241 | * Since this is an ABORT chunk, we have to discard it | |
2242 | * because of the following text: | |
2243 | * RFC 2960, Section 3.3.7 | |
2244 | * If an endpoint receives an ABORT with a format error or for an | |
2245 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2246 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2247 | * as we do not know its true length. So, to be safe, discard the |
2248 | * packet. | |
2249 | */ | |
441ae65a | 2250 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2251 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2252 | |
75205f47 VY |
2253 | /* ADD-IP: Special case for ABORT chunks |
2254 | * F4) One special consideration is that ABORT Chunks arriving | |
2255 | * destined to the IP address being deleted MUST be | |
2256 | * ignored (see Section 5.3.1 for further details). | |
2257 | */ | |
2258 | if (SCTP_ADDR_DEL == | |
2259 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2260 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2261 | |
24cb81a6 | 2262 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2263 | } |
2264 | ||
2265 | /* | |
2266 | * Process an ABORT. (SHUTDOWN-SENT state) | |
2267 | * | |
2268 | * See sctp_sf_do_9_1_abort(). | |
2269 | */ | |
172a1599 XL |
2270 | enum sctp_disposition sctp_sf_shutdown_sent_abort( |
2271 | struct net *net, | |
24cb81a6 | 2272 | const struct sctp_endpoint *ep, |
1da177e4 | 2273 | const struct sctp_association *asoc, |
bfc6f827 | 2274 | const union sctp_subtype type, |
1da177e4 | 2275 | void *arg, |
a85bbeb2 | 2276 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2277 | { |
2278 | struct sctp_chunk *chunk = arg; | |
2279 | ||
2280 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2281 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2282 | |
2283 | /* Make sure that the ABORT chunk has a valid length. | |
2284 | * Since this is an ABORT chunk, we have to discard it | |
2285 | * because of the following text: | |
2286 | * RFC 2960, Section 3.3.7 | |
2287 | * If an endpoint receives an ABORT with a format error or for an | |
2288 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2289 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2290 | * as we do not know its true length. So, to be safe, discard the |
2291 | * packet. | |
2292 | */ | |
441ae65a | 2293 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2294 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2295 | |
75205f47 VY |
2296 | /* ADD-IP: Special case for ABORT chunks |
2297 | * F4) One special consideration is that ABORT Chunks arriving | |
2298 | * destined to the IP address being deleted MUST be | |
2299 | * ignored (see Section 5.3.1 for further details). | |
2300 | */ | |
2301 | if (SCTP_ADDR_DEL == | |
2302 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2303 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2304 | |
1da177e4 LT |
2305 | /* Stop the T2-shutdown timer. */ |
2306 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2307 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2308 | ||
2309 | /* Stop the T5-shutdown guard timer. */ | |
2310 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2311 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
2312 | ||
24cb81a6 | 2313 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2314 | } |
2315 | ||
2316 | /* | |
2317 | * Process an ABORT. (SHUTDOWN-ACK-SENT state) | |
2318 | * | |
2319 | * See sctp_sf_do_9_1_abort(). | |
2320 | */ | |
172a1599 XL |
2321 | enum sctp_disposition sctp_sf_shutdown_ack_sent_abort( |
2322 | struct net *net, | |
2323 | const struct sctp_endpoint *ep, | |
2324 | const struct sctp_association *asoc, | |
2325 | const union sctp_subtype type, | |
2326 | void *arg, | |
2327 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2328 | { |
2329 | /* The same T2 timer, so we should be able to use | |
2330 | * common function with the SHUTDOWN-SENT state. | |
2331 | */ | |
24cb81a6 | 2332 | return sctp_sf_shutdown_sent_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2333 | } |
2334 | ||
2335 | /* | |
2336 | * Handle an Error received in COOKIE_ECHOED state. | |
2337 | * | |
2338 | * Only handle the error type of stale COOKIE Error, the other errors will | |
2339 | * be ignored. | |
2340 | * | |
2341 | * Inputs | |
2342 | * (endpoint, asoc, chunk) | |
2343 | * | |
2344 | * Outputs | |
2345 | * (asoc, reply_msg, msg_up, timers, counters) | |
2346 | * | |
2347 | * The return value is the disposition of the chunk. | |
2348 | */ | |
172a1599 XL |
2349 | enum sctp_disposition sctp_sf_cookie_echoed_err( |
2350 | struct net *net, | |
24cb81a6 | 2351 | const struct sctp_endpoint *ep, |
1da177e4 | 2352 | const struct sctp_association *asoc, |
bfc6f827 | 2353 | const union sctp_subtype type, |
1da177e4 | 2354 | void *arg, |
a85bbeb2 | 2355 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2356 | { |
2357 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 2358 | struct sctp_errhdr *err; |
1da177e4 LT |
2359 | |
2360 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2361 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2362 | |
2363 | /* Make sure that the ERROR chunk has a valid length. | |
2364 | * The parameter walking depends on this as well. | |
2365 | */ | |
87caeba7 | 2366 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 2367 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2368 | commands); |
2369 | ||
2370 | /* Process the error here */ | |
2371 | /* FUTURE FIXME: When PR-SCTP related and other optional | |
2372 | * parms are emitted, this will have to change to handle multiple | |
2373 | * errors. | |
2374 | */ | |
2375 | sctp_walk_errors(err, chunk->chunk_hdr) { | |
2376 | if (SCTP_ERROR_STALE_COOKIE == err->cause) | |
24cb81a6 | 2377 | return sctp_sf_do_5_2_6_stale(net, ep, asoc, type, |
1da177e4 LT |
2378 | arg, commands); |
2379 | } | |
2380 | ||
2381 | /* It is possible to have malformed error causes, and that | |
2382 | * will cause us to end the walk early. However, since | |
2383 | * we are discarding the packet, there should be no adverse | |
2384 | * affects. | |
2385 | */ | |
24cb81a6 | 2386 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2387 | } |
2388 | ||
2389 | /* | |
2390 | * Handle a Stale COOKIE Error | |
2391 | * | |
2392 | * Section: 5.2.6 Handle Stale COOKIE Error | |
2393 | * If the association is in the COOKIE-ECHOED state, the endpoint may elect | |
2394 | * one of the following three alternatives. | |
2395 | * ... | |
2396 | * 3) Send a new INIT chunk to the endpoint, adding a Cookie | |
2397 | * Preservative parameter requesting an extension to the lifetime of | |
2398 | * the State Cookie. When calculating the time extension, an | |
2399 | * implementation SHOULD use the RTT information measured based on the | |
2400 | * previous COOKIE ECHO / ERROR exchange, and should add no more | |
2401 | * than 1 second beyond the measured RTT, due to long State Cookie | |
2402 | * lifetimes making the endpoint more subject to a replay attack. | |
2403 | * | |
2404 | * Verification Tag: Not explicit, but safe to ignore. | |
2405 | * | |
2406 | * Inputs | |
2407 | * (endpoint, asoc, chunk) | |
2408 | * | |
2409 | * Outputs | |
2410 | * (asoc, reply_msg, msg_up, timers, counters) | |
2411 | * | |
2412 | * The return value is the disposition of the chunk. | |
2413 | */ | |
172a1599 XL |
2414 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
2415 | struct net *net, | |
2416 | const struct sctp_endpoint *ep, | |
2417 | const struct sctp_association *asoc, | |
2418 | const union sctp_subtype type, | |
2419 | void *arg, | |
2420 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2421 | { |
3f7a87d2 | 2422 | int attempts = asoc->init_err_counter + 1; |
365ddb65 XL |
2423 | struct sctp_chunk *chunk = arg, *reply; |
2424 | struct sctp_cookie_preserve_param bht; | |
2425 | struct sctp_bind_addr *bp; | |
d8238d9d | 2426 | struct sctp_errhdr *err; |
365ddb65 | 2427 | u32 stale; |
1da177e4 | 2428 | |
81845c21 | 2429 | if (attempts > asoc->max_init_attempts) { |
8de8c873 SS |
2430 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
2431 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 2432 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 2433 | SCTP_PERR(SCTP_ERROR_STALE_COOKIE)); |
1da177e4 LT |
2434 | return SCTP_DISPOSITION_DELETE_TCB; |
2435 | } | |
2436 | ||
d8238d9d | 2437 | err = (struct sctp_errhdr *)(chunk->skb->data); |
1da177e4 LT |
2438 | |
2439 | /* When calculating the time extension, an implementation | |
2440 | * SHOULD use the RTT information measured based on the | |
2441 | * previous COOKIE ECHO / ERROR exchange, and should add no | |
2442 | * more than 1 second beyond the measured RTT, due to long | |
2443 | * State Cookie lifetimes making the endpoint more subject to | |
2444 | * a replay attack. | |
2445 | * Measure of Staleness's unit is usec. (1/1000000 sec) | |
2446 | * Suggested Cookie Life-span Increment's unit is msec. | |
2447 | * (1/1000 sec) | |
2448 | * In general, if you use the suggested cookie life, the value | |
2449 | * found in the field of measure of staleness should be doubled | |
2450 | * to give ample time to retransmit the new cookie and thus | |
2451 | * yield a higher probability of success on the reattempt. | |
2452 | */ | |
d8238d9d | 2453 | stale = ntohl(*(__be32 *)((u8 *)err + sizeof(*err))); |
1da177e4 LT |
2454 | stale = (stale * 2) / 1000; |
2455 | ||
2456 | bht.param_hdr.type = SCTP_PARAM_COOKIE_PRESERVATIVE; | |
2457 | bht.param_hdr.length = htons(sizeof(bht)); | |
2458 | bht.lifespan_increment = htonl(stale); | |
2459 | ||
2460 | /* Build that new INIT chunk. */ | |
2461 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; | |
2462 | reply = sctp_make_init(asoc, bp, GFP_ATOMIC, sizeof(bht)); | |
2463 | if (!reply) | |
2464 | goto nomem; | |
2465 | ||
2466 | sctp_addto_chunk(reply, sizeof(bht), &bht); | |
2467 | ||
2468 | /* Clear peer's init_tag cached in assoc as we are sending a new INIT */ | |
2469 | sctp_add_cmd_sf(commands, SCTP_CMD_CLEAR_INIT_TAG, SCTP_NULL()); | |
2470 | ||
2471 | /* Stop pending T3-rtx and heartbeat timers */ | |
2472 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); | |
2473 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
2474 | ||
2475 | /* Delete non-primary peer ip addresses since we are transitioning | |
2476 | * back to the COOKIE-WAIT state | |
2477 | */ | |
2478 | sctp_add_cmd_sf(commands, SCTP_CMD_DEL_NON_PRIMARY, SCTP_NULL()); | |
2479 | ||
d808ad9a YH |
2480 | /* If we've sent any data bundled with COOKIE-ECHO we will need to |
2481 | * resend | |
1da177e4 | 2482 | */ |
b6157d8e | 2483 | sctp_add_cmd_sf(commands, SCTP_CMD_T1_RETRAN, |
1da177e4 LT |
2484 | SCTP_TRANSPORT(asoc->peer.primary_path)); |
2485 | ||
2486 | /* Cast away the const modifier, as we want to just | |
2487 | * rerun it through as a sideffect. | |
2488 | */ | |
3f7a87d2 | 2489 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_INC, SCTP_NULL()); |
1da177e4 LT |
2490 | |
2491 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2492 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2493 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2494 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
2495 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
2496 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
2497 | ||
2498 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2499 | ||
2500 | return SCTP_DISPOSITION_CONSUME; | |
2501 | ||
2502 | nomem: | |
2503 | return SCTP_DISPOSITION_NOMEM; | |
2504 | } | |
2505 | ||
2506 | /* | |
2507 | * Process an ABORT. | |
2508 | * | |
2509 | * Section: 9.1 | |
2510 | * After checking the Verification Tag, the receiving endpoint shall | |
2511 | * remove the association from its record, and shall report the | |
2512 | * termination to its upper layer. | |
2513 | * | |
2514 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
2515 | * B) Rules for packet carrying ABORT: | |
2516 | * | |
2517 | * - The endpoint shall always fill in the Verification Tag field of the | |
2518 | * outbound packet with the destination endpoint's tag value if it | |
2519 | * is known. | |
2520 | * | |
2521 | * - If the ABORT is sent in response to an OOTB packet, the endpoint | |
2522 | * MUST follow the procedure described in Section 8.4. | |
2523 | * | |
2524 | * - The receiver MUST accept the packet if the Verification Tag | |
2525 | * matches either its own tag, OR the tag of its peer. Otherwise, the | |
2526 | * receiver MUST silently discard the packet and take no further | |
2527 | * action. | |
2528 | * | |
2529 | * Inputs | |
2530 | * (endpoint, asoc, chunk) | |
2531 | * | |
2532 | * Outputs | |
2533 | * (asoc, reply_msg, msg_up, timers, counters) | |
2534 | * | |
2535 | * The return value is the disposition of the chunk. | |
2536 | */ | |
172a1599 XL |
2537 | enum sctp_disposition sctp_sf_do_9_1_abort( |
2538 | struct net *net, | |
24cb81a6 | 2539 | const struct sctp_endpoint *ep, |
1da177e4 | 2540 | const struct sctp_association *asoc, |
bfc6f827 | 2541 | const union sctp_subtype type, |
1da177e4 | 2542 | void *arg, |
a85bbeb2 | 2543 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2544 | { |
2545 | struct sctp_chunk *chunk = arg; | |
1da177e4 LT |
2546 | |
2547 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2548 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2549 | |
2550 | /* Make sure that the ABORT chunk has a valid length. | |
2551 | * Since this is an ABORT chunk, we have to discard it | |
2552 | * because of the following text: | |
2553 | * RFC 2960, Section 3.3.7 | |
2554 | * If an endpoint receives an ABORT with a format error or for an | |
2555 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2556 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2557 | * as we do not know its true length. So, to be safe, discard the |
2558 | * packet. | |
2559 | */ | |
441ae65a | 2560 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2561 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2562 | |
75205f47 VY |
2563 | /* ADD-IP: Special case for ABORT chunks |
2564 | * F4) One special consideration is that ABORT Chunks arriving | |
2565 | * destined to the IP address being deleted MUST be | |
2566 | * ignored (see Section 5.3.1 for further details). | |
2567 | */ | |
2568 | if (SCTP_ADDR_DEL == | |
2569 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2570 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2571 | |
24cb81a6 | 2572 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
75205f47 VY |
2573 | } |
2574 | ||
172a1599 XL |
2575 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
2576 | struct net *net, | |
24cb81a6 | 2577 | const struct sctp_endpoint *ep, |
75205f47 | 2578 | const struct sctp_association *asoc, |
bfc6f827 | 2579 | const union sctp_subtype type, |
75205f47 | 2580 | void *arg, |
a85bbeb2 | 2581 | struct sctp_cmd_seq *commands) |
75205f47 | 2582 | { |
172a1599 | 2583 | __be16 error = SCTP_ERROR_NO_ERROR; |
75205f47 | 2584 | struct sctp_chunk *chunk = arg; |
95c96174 | 2585 | unsigned int len; |
75205f47 | 2586 | |
1da177e4 LT |
2587 | /* See if we have an error cause code in the chunk. */ |
2588 | len = ntohs(chunk->chunk_hdr->length); | |
96ca468b | 2589 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) { |
d8238d9d | 2590 | struct sctp_errhdr *err; |
96ca468b | 2591 | |
96ca468b SW |
2592 | sctp_walk_errors(err, chunk->chunk_hdr); |
2593 | if ((void *)err != (void *)chunk->chunk_end) | |
d8238d9d XL |
2594 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
2595 | commands); | |
96ca468b | 2596 | |
d8238d9d | 2597 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
96ca468b | 2598 | } |
1da177e4 | 2599 | |
8de8c873 | 2600 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNRESET)); |
d808ad9a | 2601 | /* ASSOC_FAILED will DELETE_TCB. */ |
5be291fe | 2602 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(error)); |
b01a2407 EB |
2603 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
2604 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
2605 | |
2606 | return SCTP_DISPOSITION_ABORT; | |
2607 | } | |
2608 | ||
2609 | /* | |
2610 | * Process an ABORT. (COOKIE-WAIT state) | |
2611 | * | |
2612 | * See sctp_sf_do_9_1_abort() above. | |
2613 | */ | |
172a1599 XL |
2614 | enum sctp_disposition sctp_sf_cookie_wait_abort( |
2615 | struct net *net, | |
2616 | const struct sctp_endpoint *ep, | |
2617 | const struct sctp_association *asoc, | |
2618 | const union sctp_subtype type, | |
2619 | void *arg, | |
2620 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2621 | { |
172a1599 | 2622 | __be16 error = SCTP_ERROR_NO_ERROR; |
1da177e4 | 2623 | struct sctp_chunk *chunk = arg; |
95c96174 | 2624 | unsigned int len; |
1da177e4 LT |
2625 | |
2626 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2627 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2628 | |
2629 | /* Make sure that the ABORT chunk has a valid length. | |
2630 | * Since this is an ABORT chunk, we have to discard it | |
2631 | * because of the following text: | |
2632 | * RFC 2960, Section 3.3.7 | |
2633 | * If an endpoint receives an ABORT with a format error or for an | |
2634 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2635 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2636 | * as we do not know its true length. So, to be safe, discard the |
2637 | * packet. | |
2638 | */ | |
441ae65a | 2639 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2640 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2641 | |
2642 | /* See if we have an error cause code in the chunk. */ | |
2643 | len = ntohs(chunk->chunk_hdr->length); | |
2644 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) | |
d8238d9d | 2645 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
1da177e4 | 2646 | |
24cb81a6 | 2647 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, asoc, |
8de8c873 | 2648 | chunk->transport); |
1da177e4 LT |
2649 | } |
2650 | ||
2651 | /* | |
2652 | * Process an incoming ICMP as an ABORT. (COOKIE-WAIT state) | |
2653 | */ | |
172a1599 XL |
2654 | enum sctp_disposition sctp_sf_cookie_wait_icmp_abort( |
2655 | struct net *net, | |
24cb81a6 | 2656 | const struct sctp_endpoint *ep, |
1da177e4 | 2657 | const struct sctp_association *asoc, |
bfc6f827 | 2658 | const union sctp_subtype type, |
1da177e4 | 2659 | void *arg, |
a85bbeb2 | 2660 | struct sctp_cmd_seq *commands) |
1da177e4 | 2661 | { |
24cb81a6 | 2662 | return sctp_stop_t1_and_abort(net, commands, SCTP_ERROR_NO_ERROR, |
8de8c873 | 2663 | ENOPROTOOPT, asoc, |
3f7a87d2 | 2664 | (struct sctp_transport *)arg); |
1da177e4 LT |
2665 | } |
2666 | ||
2667 | /* | |
2668 | * Process an ABORT. (COOKIE-ECHOED state) | |
2669 | */ | |
172a1599 XL |
2670 | enum sctp_disposition sctp_sf_cookie_echoed_abort( |
2671 | struct net *net, | |
2672 | const struct sctp_endpoint *ep, | |
2673 | const struct sctp_association *asoc, | |
2674 | const union sctp_subtype type, | |
2675 | void *arg, | |
2676 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2677 | { |
2678 | /* There is a single T1 timer, so we should be able to use | |
2679 | * common function with the COOKIE-WAIT state. | |
2680 | */ | |
24cb81a6 | 2681 | return sctp_sf_cookie_wait_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2682 | } |
2683 | ||
2684 | /* | |
2685 | * Stop T1 timer and abort association with "INIT failed". | |
2686 | * | |
2687 | * This is common code called by several sctp_sf_*_abort() functions above. | |
2688 | */ | |
172a1599 XL |
2689 | static enum sctp_disposition sctp_stop_t1_and_abort( |
2690 | struct net *net, | |
2691 | struct sctp_cmd_seq *commands, | |
2692 | __be16 error, int sk_err, | |
2693 | const struct sctp_association *asoc, | |
2694 | struct sctp_transport *transport) | |
1da177e4 | 2695 | { |
bb33381d DB |
2696 | pr_debug("%s: ABORT received (INIT)\n", __func__); |
2697 | ||
1da177e4 LT |
2698 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
2699 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
24cb81a6 | 2700 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
2701 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
2702 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
8de8c873 | 2703 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(sk_err)); |
1da177e4 LT |
2704 | /* CMD_INIT_FAILED will DELETE_TCB. */ |
2705 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 2706 | SCTP_PERR(error)); |
bb33381d | 2707 | |
3f7a87d2 | 2708 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
2709 | } |
2710 | ||
2711 | /* | |
2712 | * sctp_sf_do_9_2_shut | |
2713 | * | |
2714 | * Section: 9.2 | |
2715 | * Upon the reception of the SHUTDOWN, the peer endpoint shall | |
2716 | * - enter the SHUTDOWN-RECEIVED state, | |
2717 | * | |
2718 | * - stop accepting new data from its SCTP user | |
2719 | * | |
2720 | * - verify, by checking the Cumulative TSN Ack field of the chunk, | |
2721 | * that all its outstanding DATA chunks have been received by the | |
2722 | * SHUTDOWN sender. | |
2723 | * | |
2724 | * Once an endpoint as reached the SHUTDOWN-RECEIVED state it MUST NOT | |
2725 | * send a SHUTDOWN in response to a ULP request. And should discard | |
2726 | * subsequent SHUTDOWN chunks. | |
2727 | * | |
2728 | * If there are still outstanding DATA chunks left, the SHUTDOWN | |
2729 | * receiver shall continue to follow normal data transmission | |
2730 | * procedures defined in Section 6 until all outstanding DATA chunks | |
2731 | * are acknowledged; however, the SHUTDOWN receiver MUST NOT accept | |
2732 | * new data from its SCTP user. | |
2733 | * | |
2734 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2735 | * | |
2736 | * Inputs | |
2737 | * (endpoint, asoc, chunk) | |
2738 | * | |
2739 | * Outputs | |
2740 | * (asoc, reply_msg, msg_up, timers, counters) | |
2741 | * | |
2742 | * The return value is the disposition of the chunk. | |
2743 | */ | |
172a1599 XL |
2744 | enum sctp_disposition sctp_sf_do_9_2_shutdown( |
2745 | struct net *net, | |
2746 | const struct sctp_endpoint *ep, | |
2747 | const struct sctp_association *asoc, | |
2748 | const union sctp_subtype type, | |
2749 | void *arg, | |
2750 | struct sctp_cmd_seq *commands) | |
2751 | { | |
2752 | enum sctp_disposition disposition; | |
1da177e4 | 2753 | struct sctp_chunk *chunk = arg; |
e61e4055 | 2754 | struct sctp_shutdownhdr *sdh; |
1da177e4 | 2755 | struct sctp_ulpevent *ev; |
df10eec4 | 2756 | __u32 ctsn; |
1da177e4 LT |
2757 | |
2758 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2759 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2760 | |
2761 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2762 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2763 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2764 | commands); |
2765 | ||
2766 | /* Convert the elaborate header. */ | |
e61e4055 XL |
2767 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
2768 | skb_pull(chunk->skb, sizeof(*sdh)); | |
1da177e4 | 2769 | chunk->subh.shutdown_hdr = sdh; |
df10eec4 WY |
2770 | ctsn = ntohl(sdh->cum_tsn_ack); |
2771 | ||
a2f36eec | 2772 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { |
bb33381d DB |
2773 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2774 | asoc->ctsn_ack_point); | |
2775 | ||
a2f36eec WY |
2776 | return SCTP_DISPOSITION_DISCARD; |
2777 | } | |
2778 | ||
df10eec4 WY |
2779 | /* If Cumulative TSN Ack beyond the max tsn currently |
2780 | * send, terminating the association and respond to the | |
2781 | * sender with an ABORT. | |
2782 | */ | |
2783 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 2784 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
1da177e4 | 2785 | |
eb0e0076 SS |
2786 | /* API 5.3.1.5 SCTP_SHUTDOWN_EVENT |
2787 | * When a peer sends a SHUTDOWN, SCTP delivers this notification to | |
2788 | * inform the application that it should cease sending data. | |
2789 | */ | |
2790 | ev = sctp_ulpevent_make_shutdown_event(asoc, 0, GFP_ATOMIC); | |
2791 | if (!ev) { | |
2792 | disposition = SCTP_DISPOSITION_NOMEM; | |
d808ad9a | 2793 | goto out; |
eb0e0076 SS |
2794 | } |
2795 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
2796 | ||
1da177e4 LT |
2797 | /* Upon the reception of the SHUTDOWN, the peer endpoint shall |
2798 | * - enter the SHUTDOWN-RECEIVED state, | |
2799 | * - stop accepting new data from its SCTP user | |
2800 | * | |
2801 | * [This is implicit in the new state.] | |
2802 | */ | |
2803 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2804 | SCTP_STATE(SCTP_STATE_SHUTDOWN_RECEIVED)); | |
2805 | disposition = SCTP_DISPOSITION_CONSUME; | |
2806 | ||
2807 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 2808 | disposition = sctp_sf_do_9_2_shutdown_ack(net, ep, asoc, type, |
1da177e4 LT |
2809 | arg, commands); |
2810 | } | |
2811 | ||
2812 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
2813 | goto out; | |
2814 | ||
2815 | /* - verify, by checking the Cumulative TSN Ack field of the | |
2816 | * chunk, that all its outstanding DATA chunks have been | |
2817 | * received by the SHUTDOWN sender. | |
2818 | */ | |
2819 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2178eda8 | 2820 | SCTP_BE32(chunk->subh.shutdown_hdr->cum_tsn_ack)); |
1da177e4 | 2821 | |
1da177e4 LT |
2822 | out: |
2823 | return disposition; | |
2824 | } | |
2825 | ||
2e3f92da WY |
2826 | /* |
2827 | * sctp_sf_do_9_2_shut_ctsn | |
2828 | * | |
2829 | * Once an endpoint has reached the SHUTDOWN-RECEIVED state, | |
2830 | * it MUST NOT send a SHUTDOWN in response to a ULP request. | |
2831 | * The Cumulative TSN Ack of the received SHUTDOWN chunk | |
2832 | * MUST be processed. | |
2833 | */ | |
172a1599 XL |
2834 | enum sctp_disposition sctp_sf_do_9_2_shut_ctsn( |
2835 | struct net *net, | |
2836 | const struct sctp_endpoint *ep, | |
2837 | const struct sctp_association *asoc, | |
2838 | const union sctp_subtype type, | |
2839 | void *arg, | |
2840 | struct sctp_cmd_seq *commands) | |
2e3f92da WY |
2841 | { |
2842 | struct sctp_chunk *chunk = arg; | |
e61e4055 | 2843 | struct sctp_shutdownhdr *sdh; |
a2f36eec | 2844 | __u32 ctsn; |
2e3f92da WY |
2845 | |
2846 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2847 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2848 | |
2849 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2850 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2851 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
2e3f92da WY |
2852 | commands); |
2853 | ||
e61e4055 | 2854 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
a2f36eec WY |
2855 | ctsn = ntohl(sdh->cum_tsn_ack); |
2856 | ||
2857 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
2858 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2859 | asoc->ctsn_ack_point); | |
2860 | ||
a2f36eec WY |
2861 | return SCTP_DISPOSITION_DISCARD; |
2862 | } | |
2e3f92da WY |
2863 | |
2864 | /* If Cumulative TSN Ack beyond the max tsn currently | |
2865 | * send, terminating the association and respond to the | |
2866 | * sender with an ABORT. | |
2867 | */ | |
a2f36eec | 2868 | if (!TSN_lt(ctsn, asoc->next_tsn)) |
24cb81a6 | 2869 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2870 | |
2871 | /* verify, by checking the Cumulative TSN Ack field of the | |
2872 | * chunk, that all its outstanding DATA chunks have been | |
2873 | * received by the SHUTDOWN sender. | |
2874 | */ | |
2875 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2876 | SCTP_BE32(sdh->cum_tsn_ack)); | |
2877 | ||
2878 | return SCTP_DISPOSITION_CONSUME; | |
2879 | } | |
2880 | ||
1da177e4 LT |
2881 | /* RFC 2960 9.2 |
2882 | * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk | |
2883 | * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination | |
2884 | * transport addresses (either in the IP addresses or in the INIT chunk) | |
2885 | * that belong to this association, it should discard the INIT chunk and | |
2886 | * retransmit the SHUTDOWN ACK chunk. | |
2887 | */ | |
172a1599 XL |
2888 | enum sctp_disposition sctp_sf_do_9_2_reshutack( |
2889 | struct net *net, | |
2890 | const struct sctp_endpoint *ep, | |
2891 | const struct sctp_association *asoc, | |
2892 | const union sctp_subtype type, | |
2893 | void *arg, | |
2894 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2895 | { |
172a1599 | 2896 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
2897 | struct sctp_chunk *reply; |
2898 | ||
ece25dfa | 2899 | /* Make sure that the chunk has a valid length */ |
922dbc5b | 2900 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2901 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
2902 | commands); |
2903 | ||
1da177e4 LT |
2904 | /* Since we are not going to really process this INIT, there |
2905 | * is no point in verifying chunk boundries. Just generate | |
2906 | * the SHUTDOWN ACK. | |
2907 | */ | |
2908 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
2909 | if (NULL == reply) | |
2910 | goto nomem; | |
2911 | ||
2912 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
2913 | * the T2-SHUTDOWN timer. | |
2914 | */ | |
2915 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
2916 | ||
2917 | /* and restart the T2-shutdown timer. */ | |
2918 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
2919 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2920 | ||
2921 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2922 | ||
2923 | return SCTP_DISPOSITION_CONSUME; | |
2924 | nomem: | |
2925 | return SCTP_DISPOSITION_NOMEM; | |
2926 | } | |
2927 | ||
2928 | /* | |
2929 | * sctp_sf_do_ecn_cwr | |
2930 | * | |
2931 | * Section: Appendix A: Explicit Congestion Notification | |
2932 | * | |
2933 | * CWR: | |
2934 | * | |
2935 | * RFC 2481 details a specific bit for a sender to send in the header of | |
2936 | * its next outbound TCP segment to indicate to its peer that it has | |
2937 | * reduced its congestion window. This is termed the CWR bit. For | |
2938 | * SCTP the same indication is made by including the CWR chunk. | |
2939 | * This chunk contains one data element, i.e. the TSN number that | |
2940 | * was sent in the ECNE chunk. This element represents the lowest | |
2941 | * TSN number in the datagram that was originally marked with the | |
2942 | * CE bit. | |
2943 | * | |
2944 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2945 | * Inputs | |
2946 | * (endpoint, asoc, chunk) | |
2947 | * | |
2948 | * Outputs | |
2949 | * (asoc, reply_msg, msg_up, timers, counters) | |
2950 | * | |
2951 | * The return value is the disposition of the chunk. | |
2952 | */ | |
172a1599 XL |
2953 | enum sctp_disposition sctp_sf_do_ecn_cwr(struct net *net, |
2954 | const struct sctp_endpoint *ep, | |
2955 | const struct sctp_association *asoc, | |
2956 | const union sctp_subtype type, | |
2957 | void *arg, | |
2958 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2959 | { |
1da177e4 | 2960 | struct sctp_chunk *chunk = arg; |
65f77105 | 2961 | struct sctp_cwrhdr *cwr; |
34bcca28 | 2962 | u32 lowest_tsn; |
1da177e4 LT |
2963 | |
2964 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2965 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2966 | |
b515fd27 | 2967 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 2968 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 2969 | commands); |
d808ad9a | 2970 | |
65f77105 XL |
2971 | cwr = (struct sctp_cwrhdr *)chunk->skb->data; |
2972 | skb_pull(chunk->skb, sizeof(*cwr)); | |
1da177e4 | 2973 | |
34bcca28 | 2974 | lowest_tsn = ntohl(cwr->lowest_tsn); |
1da177e4 LT |
2975 | |
2976 | /* Does this CWR ack the last sent congestion notification? */ | |
34bcca28 | 2977 | if (TSN_lte(asoc->last_ecne_tsn, lowest_tsn)) { |
1da177e4 LT |
2978 | /* Stop sending ECNE. */ |
2979 | sctp_add_cmd_sf(commands, | |
2980 | SCTP_CMD_ECN_CWR, | |
34bcca28 | 2981 | SCTP_U32(lowest_tsn)); |
1da177e4 LT |
2982 | } |
2983 | return SCTP_DISPOSITION_CONSUME; | |
2984 | } | |
2985 | ||
2986 | /* | |
2987 | * sctp_sf_do_ecne | |
2988 | * | |
2989 | * Section: Appendix A: Explicit Congestion Notification | |
2990 | * | |
2991 | * ECN-Echo | |
2992 | * | |
2993 | * RFC 2481 details a specific bit for a receiver to send back in its | |
2994 | * TCP acknowledgements to notify the sender of the Congestion | |
2995 | * Experienced (CE) bit having arrived from the network. For SCTP this | |
2996 | * same indication is made by including the ECNE chunk. This chunk | |
2997 | * contains one data element, i.e. the lowest TSN associated with the IP | |
2998 | * datagram marked with the CE bit..... | |
2999 | * | |
3000 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3001 | * Inputs | |
3002 | * (endpoint, asoc, chunk) | |
3003 | * | |
3004 | * Outputs | |
3005 | * (asoc, reply_msg, msg_up, timers, counters) | |
3006 | * | |
3007 | * The return value is the disposition of the chunk. | |
3008 | */ | |
172a1599 XL |
3009 | enum sctp_disposition sctp_sf_do_ecne(struct net *net, |
3010 | const struct sctp_endpoint *ep, | |
3011 | const struct sctp_association *asoc, | |
3012 | const union sctp_subtype type, | |
3013 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 3014 | { |
1da177e4 | 3015 | struct sctp_chunk *chunk = arg; |
1fb6d83b | 3016 | struct sctp_ecnehdr *ecne; |
1da177e4 LT |
3017 | |
3018 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3019 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3020 | |
b515fd27 | 3021 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 3022 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3023 | commands); |
3024 | ||
1fb6d83b XL |
3025 | ecne = (struct sctp_ecnehdr *)chunk->skb->data; |
3026 | skb_pull(chunk->skb, sizeof(*ecne)); | |
1da177e4 LT |
3027 | |
3028 | /* If this is a newer ECNE than the last CWR packet we sent out */ | |
3029 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_ECNE, | |
3030 | SCTP_U32(ntohl(ecne->lowest_tsn))); | |
3031 | ||
3032 | return SCTP_DISPOSITION_CONSUME; | |
3033 | } | |
3034 | ||
3035 | /* | |
3036 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
3037 | * | |
3038 | * The SCTP endpoint MUST always acknowledge the reception of each valid | |
3039 | * DATA chunk. | |
3040 | * | |
3041 | * The guidelines on delayed acknowledgement algorithm specified in | |
3042 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
3043 | * acknowledgement SHOULD be generated for at least every second packet | |
3044 | * (not every second DATA chunk) received, and SHOULD be generated within | |
3045 | * 200 ms of the arrival of any unacknowledged DATA chunk. In some | |
3046 | * situations it may be beneficial for an SCTP transmitter to be more | |
3047 | * conservative than the algorithms detailed in this document allow. | |
3048 | * However, an SCTP transmitter MUST NOT be more aggressive than the | |
3049 | * following algorithms allow. | |
3050 | * | |
3051 | * A SCTP receiver MUST NOT generate more than one SACK for every | |
3052 | * incoming packet, other than to update the offered window as the | |
3053 | * receiving application consumes new data. | |
3054 | * | |
3055 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3056 | * | |
3057 | * Inputs | |
3058 | * (endpoint, asoc, chunk) | |
3059 | * | |
3060 | * Outputs | |
3061 | * (asoc, reply_msg, msg_up, timers, counters) | |
3062 | * | |
3063 | * The return value is the disposition of the chunk. | |
3064 | */ | |
172a1599 XL |
3065 | enum sctp_disposition sctp_sf_eat_data_6_2(struct net *net, |
3066 | const struct sctp_endpoint *ep, | |
3067 | const struct sctp_association *asoc, | |
3068 | const union sctp_subtype type, | |
3069 | void *arg, | |
3070 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3071 | { |
c488b770 | 3072 | union sctp_arg force = SCTP_NOFORCE(); |
1da177e4 LT |
3073 | struct sctp_chunk *chunk = arg; |
3074 | int error; | |
3075 | ||
3076 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3077 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3078 | SCTP_NULL()); | |
24cb81a6 | 3079 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3080 | } |
1da177e4 | 3081 | |
9d4ceaf1 | 3082 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3083 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3084 | commands); |
3085 | ||
cb3f837b | 3086 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3087 | switch (error) { |
3088 | case SCTP_IERROR_NO_ERROR: | |
3089 | break; | |
3090 | case SCTP_IERROR_HIGH_TSN: | |
3091 | case SCTP_IERROR_BAD_STREAM: | |
24cb81a6 | 3092 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3093 | goto discard_noforce; |
3094 | case SCTP_IERROR_DUP_TSN: | |
3095 | case SCTP_IERROR_IGNORE_TSN: | |
24cb81a6 | 3096 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3097 | goto discard_force; |
3098 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3099 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3100 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3101 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3102 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3103 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3104 | default: |
3105 | BUG(); | |
3106 | } | |
3107 | ||
6dc7694f WY |
3108 | if (chunk->chunk_hdr->flags & SCTP_DATA_SACK_IMM) |
3109 | force = SCTP_FORCE(); | |
3110 | ||
9f70f46b | 3111 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
3112 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
3113 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
3114 | } | |
3115 | ||
3116 | /* If this is the last chunk in a packet, we need to count it | |
3117 | * toward sack generation. Note that we need to SACK every | |
3118 | * OTHER packet containing data chunks, EVEN IF WE DISCARD | |
3119 | * THEM. We elect to NOT generate SACK's if the chunk fails | |
3120 | * the verification tag test. | |
3121 | * | |
3122 | * RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3123 | * | |
3124 | * The SCTP endpoint MUST always acknowledge the reception of | |
3125 | * each valid DATA chunk. | |
3126 | * | |
3127 | * The guidelines on delayed acknowledgement algorithm | |
3128 | * specified in Section 4.2 of [RFC2581] SHOULD be followed. | |
3129 | * Specifically, an acknowledgement SHOULD be generated for at | |
3130 | * least every second packet (not every second DATA chunk) | |
3131 | * received, and SHOULD be generated within 200 ms of the | |
3132 | * arrival of any unacknowledged DATA chunk. In some | |
3133 | * situations it may be beneficial for an SCTP transmitter to | |
3134 | * be more conservative than the algorithms detailed in this | |
3135 | * document allow. However, an SCTP transmitter MUST NOT be | |
3136 | * more aggressive than the following algorithms allow. | |
3137 | */ | |
52ccb8e9 | 3138 | if (chunk->end_of_packet) |
6dc7694f | 3139 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3140 | |
1da177e4 LT |
3141 | return SCTP_DISPOSITION_CONSUME; |
3142 | ||
3143 | discard_force: | |
3144 | /* RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3145 | * | |
3146 | * When a packet arrives with duplicate DATA chunk(s) and with | |
3147 | * no new DATA chunk(s), the endpoint MUST immediately send a | |
3148 | * SACK with no delay. If a packet arrives with duplicate | |
3149 | * DATA chunk(s) bundled with new DATA chunks, the endpoint | |
3150 | * MAY immediately send a SACK. Normally receipt of duplicate | |
3151 | * DATA chunks will occur when the original SACK chunk was lost | |
3152 | * and the peer's RTO has expired. The duplicate TSN number(s) | |
3153 | * SHOULD be reported in the SACK as duplicate. | |
3154 | */ | |
3155 | /* In our case, we split the MAY SACK advice up whether or not | |
3156 | * the last chunk is a duplicate.' | |
3157 | */ | |
3158 | if (chunk->end_of_packet) | |
3159 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3160 | return SCTP_DISPOSITION_DISCARD; | |
3161 | ||
3162 | discard_noforce: | |
52ccb8e9 | 3163 | if (chunk->end_of_packet) |
6dc7694f | 3164 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3165 | |
1da177e4 | 3166 | return SCTP_DISPOSITION_DISCARD; |
1da177e4 LT |
3167 | } |
3168 | ||
3169 | /* | |
3170 | * sctp_sf_eat_data_fast_4_4 | |
3171 | * | |
3172 | * Section: 4 (4) | |
3173 | * (4) In SHUTDOWN-SENT state the endpoint MUST acknowledge any received | |
3174 | * DATA chunks without delay. | |
3175 | * | |
3176 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3177 | * Inputs | |
3178 | * (endpoint, asoc, chunk) | |
3179 | * | |
3180 | * Outputs | |
3181 | * (asoc, reply_msg, msg_up, timers, counters) | |
3182 | * | |
3183 | * The return value is the disposition of the chunk. | |
3184 | */ | |
172a1599 XL |
3185 | enum sctp_disposition sctp_sf_eat_data_fast_4_4( |
3186 | struct net *net, | |
3187 | const struct sctp_endpoint *ep, | |
3188 | const struct sctp_association *asoc, | |
3189 | const union sctp_subtype type, | |
3190 | void *arg, | |
3191 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3192 | { |
3193 | struct sctp_chunk *chunk = arg; | |
3194 | int error; | |
3195 | ||
3196 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3197 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3198 | SCTP_NULL()); | |
24cb81a6 | 3199 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3200 | } |
3201 | ||
9d4ceaf1 | 3202 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3203 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3204 | commands); |
3205 | ||
cb3f837b | 3206 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3207 | switch (error) { |
3208 | case SCTP_IERROR_NO_ERROR: | |
3209 | case SCTP_IERROR_HIGH_TSN: | |
3210 | case SCTP_IERROR_DUP_TSN: | |
3211 | case SCTP_IERROR_IGNORE_TSN: | |
3212 | case SCTP_IERROR_BAD_STREAM: | |
3213 | break; | |
3214 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3215 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3216 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3217 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3218 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3219 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3220 | default: |
3221 | BUG(); | |
3222 | } | |
3223 | ||
3224 | /* Go a head and force a SACK, since we are shutting down. */ | |
3225 | ||
3226 | /* Implementor's Guide. | |
3227 | * | |
3228 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
3229 | * respond to each received packet containing one or more DATA chunk(s) | |
3230 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
3231 | */ | |
3232 | if (chunk->end_of_packet) { | |
3233 | /* We must delay the chunk creation since the cumulative | |
3234 | * TSN has not been updated yet. | |
3235 | */ | |
3236 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
3237 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3238 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
3239 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3240 | } | |
3241 | ||
1da177e4 LT |
3242 | return SCTP_DISPOSITION_CONSUME; |
3243 | } | |
3244 | ||
3245 | /* | |
3246 | * Section: 6.2 Processing a Received SACK | |
3247 | * D) Any time a SACK arrives, the endpoint performs the following: | |
3248 | * | |
3249 | * i) If Cumulative TSN Ack is less than the Cumulative TSN Ack Point, | |
3250 | * then drop the SACK. Since Cumulative TSN Ack is monotonically | |
3251 | * increasing, a SACK whose Cumulative TSN Ack is less than the | |
3252 | * Cumulative TSN Ack Point indicates an out-of-order SACK. | |
3253 | * | |
3254 | * ii) Set rwnd equal to the newly received a_rwnd minus the number | |
3255 | * of bytes still outstanding after processing the Cumulative TSN Ack | |
3256 | * and the Gap Ack Blocks. | |
3257 | * | |
3258 | * iii) If the SACK is missing a TSN that was previously | |
3259 | * acknowledged via a Gap Ack Block (e.g., the data receiver | |
3260 | * reneged on the data), then mark the corresponding DATA chunk | |
3261 | * as available for retransmit: Mark it as missing for fast | |
3262 | * retransmit as described in Section 7.2.4 and if no retransmit | |
3263 | * timer is running for the destination address to which the DATA | |
3264 | * chunk was originally transmitted, then T3-rtx is started for | |
3265 | * that destination address. | |
3266 | * | |
3267 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3268 | * | |
3269 | * Inputs | |
3270 | * (endpoint, asoc, chunk) | |
3271 | * | |
3272 | * Outputs | |
3273 | * (asoc, reply_msg, msg_up, timers, counters) | |
3274 | * | |
3275 | * The return value is the disposition of the chunk. | |
3276 | */ | |
172a1599 XL |
3277 | enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net, |
3278 | const struct sctp_endpoint *ep, | |
3279 | const struct sctp_association *asoc, | |
3280 | const union sctp_subtype type, | |
3281 | void *arg, | |
3282 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3283 | { |
3284 | struct sctp_chunk *chunk = arg; | |
78731085 | 3285 | struct sctp_sackhdr *sackh; |
1da177e4 LT |
3286 | __u32 ctsn; |
3287 | ||
103d750c MH |
3288 | trace_sctp_probe(ep, asoc, chunk); |
3289 | ||
1da177e4 | 3290 | if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6 | 3291 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3292 | |
3293 | /* Make sure that the SACK chunk has a valid length. */ | |
d4d6c614 | 3294 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_sack_chunk))) |
24cb81a6 | 3295 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3296 | commands); |
3297 | ||
3298 | /* Pull the SACK chunk from the data buffer */ | |
3299 | sackh = sctp_sm_pull_sack(chunk); | |
3300 | /* Was this a bogus SACK? */ | |
3301 | if (!sackh) | |
24cb81a6 | 3302 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3303 | chunk->subh.sack_hdr = sackh; |
3304 | ctsn = ntohl(sackh->cum_tsn_ack); | |
3305 | ||
3306 | /* i) If Cumulative TSN Ack is less than the Cumulative TSN | |
3307 | * Ack Point, then drop the SACK. Since Cumulative TSN | |
3308 | * Ack is monotonically increasing, a SACK whose | |
3309 | * Cumulative TSN Ack is less than the Cumulative TSN Ack | |
3310 | * Point indicates an out-of-order SACK. | |
3311 | */ | |
3312 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
3313 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
3314 | asoc->ctsn_ack_point); | |
3315 | ||
1da177e4 LT |
3316 | return SCTP_DISPOSITION_DISCARD; |
3317 | } | |
3318 | ||
aecedeab WY |
3319 | /* If Cumulative TSN Ack beyond the max tsn currently |
3320 | * send, terminating the association and respond to the | |
3321 | * sender with an ABORT. | |
3322 | */ | |
3323 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 3324 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
aecedeab | 3325 | |
1da177e4 | 3326 | /* Return this SACK for further processing. */ |
edfee033 | 3327 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk)); |
1da177e4 LT |
3328 | |
3329 | /* Note: We do the rest of the work on the PROCESS_SACK | |
3330 | * sideeffect. | |
3331 | */ | |
3332 | return SCTP_DISPOSITION_CONSUME; | |
3333 | } | |
3334 | ||
3335 | /* | |
3336 | * Generate an ABORT in response to a packet. | |
3337 | * | |
047a2428 | 3338 | * Section: 8.4 Handle "Out of the blue" Packets, sctpimpguide 2.41 |
1da177e4 | 3339 | * |
047a2428 JF |
3340 | * 8) The receiver should respond to the sender of the OOTB packet with |
3341 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3342 | * MUST fill in the Verification Tag field of the outbound packet | |
3343 | * with the value found in the Verification Tag field of the OOTB | |
3344 | * packet and set the T-bit in the Chunk Flags to indicate that the | |
3345 | * Verification Tag is reflected. After sending this ABORT, the | |
3346 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3347 | * no further action. | |
1da177e4 LT |
3348 | * |
3349 | * Verification Tag: | |
3350 | * | |
3351 | * The return value is the disposition of the chunk. | |
3352 | */ | |
172a1599 XL |
3353 | static enum sctp_disposition sctp_sf_tabort_8_4_8( |
3354 | struct net *net, | |
24cb81a6 | 3355 | const struct sctp_endpoint *ep, |
1da177e4 | 3356 | const struct sctp_association *asoc, |
bfc6f827 | 3357 | const union sctp_subtype type, |
1da177e4 | 3358 | void *arg, |
a85bbeb2 | 3359 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
3360 | { |
3361 | struct sctp_packet *packet = NULL; | |
3362 | struct sctp_chunk *chunk = arg; | |
3363 | struct sctp_chunk *abort; | |
3364 | ||
2ce95503 | 3365 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
eab59075 MRL |
3366 | if (!packet) |
3367 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3368 | |
eab59075 MRL |
3369 | /* Make an ABORT. The T bit will be set if the asoc |
3370 | * is NULL. | |
3371 | */ | |
3372 | abort = sctp_make_abort(asoc, chunk, 0); | |
3373 | if (!abort) { | |
3374 | sctp_ootb_pkt_free(packet); | |
3375 | return SCTP_DISPOSITION_NOMEM; | |
3376 | } | |
047a2428 | 3377 | |
eab59075 MRL |
3378 | /* Reflect vtag if T-Bit is set */ |
3379 | if (sctp_test_T_bit(abort)) | |
3380 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3381 | |
eab59075 MRL |
3382 | /* Set the skb to the belonging sock for accounting. */ |
3383 | abort->skb->sk = ep->base.sk; | |
1da177e4 | 3384 | |
eab59075 | 3385 | sctp_packet_append_chunk(packet, abort); |
1da177e4 | 3386 | |
eab59075 MRL |
3387 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3388 | SCTP_PACKET(packet)); | |
1da177e4 | 3389 | |
eab59075 | 3390 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3391 | |
eab59075 MRL |
3392 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3393 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
3394 | } |
3395 | ||
3396 | /* | |
3397 | * Received an ERROR chunk from peer. Generate SCTP_REMOTE_ERROR | |
3398 | * event as ULP notification for each cause included in the chunk. | |
3399 | * | |
3400 | * API 5.3.1.3 - SCTP_REMOTE_ERROR | |
3401 | * | |
3402 | * The return value is the disposition of the chunk. | |
3403 | */ | |
172a1599 XL |
3404 | enum sctp_disposition sctp_sf_operr_notify(struct net *net, |
3405 | const struct sctp_endpoint *ep, | |
3406 | const struct sctp_association *asoc, | |
3407 | const union sctp_subtype type, | |
3408 | void *arg, | |
3409 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3410 | { |
3411 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 3412 | struct sctp_errhdr *err; |
1da177e4 LT |
3413 | |
3414 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3415 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3416 | |
3417 | /* Make sure that the ERROR chunk has a valid length. */ | |
87caeba7 | 3418 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 3419 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3420 | commands); |
8a00be1c SW |
3421 | sctp_walk_errors(err, chunk->chunk_hdr); |
3422 | if ((void *)err != (void *)chunk->chunk_end) | |
24cb81a6 | 3423 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
8a00be1c | 3424 | (void *)err, commands); |
1da177e4 | 3425 | |
3df26787 WY |
3426 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_OPERR, |
3427 | SCTP_CHUNK(chunk)); | |
1da177e4 | 3428 | |
1da177e4 | 3429 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
3430 | } |
3431 | ||
3432 | /* | |
3433 | * Process an inbound SHUTDOWN ACK. | |
3434 | * | |
3435 | * From Section 9.2: | |
3436 | * Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3437 | * stop the T2-shutdown timer, send a SHUTDOWN COMPLETE chunk to its | |
3438 | * peer, and remove all record of the association. | |
3439 | * | |
3440 | * The return value is the disposition. | |
3441 | */ | |
172a1599 XL |
3442 | enum sctp_disposition sctp_sf_do_9_2_final(struct net *net, |
3443 | const struct sctp_endpoint *ep, | |
3444 | const struct sctp_association *asoc, | |
3445 | const union sctp_subtype type, | |
3446 | void *arg, | |
3447 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3448 | { |
3449 | struct sctp_chunk *chunk = arg; | |
3450 | struct sctp_chunk *reply; | |
3451 | struct sctp_ulpevent *ev; | |
3452 | ||
3453 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3454 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3455 | |
3456 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3457 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3458 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3459 | commands); |
1da177e4 LT |
3460 | /* 10.2 H) SHUTDOWN COMPLETE notification |
3461 | * | |
3462 | * When SCTP completes the shutdown procedures (section 9.2) this | |
3463 | * notification is passed to the upper layer. | |
3464 | */ | |
3465 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 3466 | 0, 0, 0, NULL, GFP_ATOMIC); |
1da177e4 LT |
3467 | if (!ev) |
3468 | goto nomem; | |
3469 | ||
df7deeb5 VY |
3470 | /* ...send a SHUTDOWN COMPLETE chunk to its peer, */ |
3471 | reply = sctp_make_shutdown_complete(asoc, chunk); | |
3472 | if (!reply) | |
3473 | goto nomem_chunk; | |
3474 | ||
3475 | /* Do all the commands now (after allocation), so that we | |
3476 | * have consistent state if memory allocation failes | |
3477 | */ | |
1da177e4 LT |
3478 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
3479 | ||
3480 | /* Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3481 | * stop the T2-shutdown timer, | |
3482 | */ | |
3483 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3484 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3485 | ||
3486 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3487 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
3488 | ||
1da177e4 LT |
3489 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
3490 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
b01a2407 EB |
3491 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
3492 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3493 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); |
3494 | ||
3495 | /* ...and remove all record of the association. */ | |
3496 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
3497 | return SCTP_DISPOSITION_DELETE_TCB; | |
3498 | ||
df7deeb5 VY |
3499 | nomem_chunk: |
3500 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
3501 | nomem: |
3502 | return SCTP_DISPOSITION_NOMEM; | |
3503 | } | |
3504 | ||
3505 | /* | |
047a2428 JF |
3506 | * RFC 2960, 8.4 - Handle "Out of the blue" Packets, sctpimpguide 2.41. |
3507 | * | |
1da177e4 LT |
3508 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
3509 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. | |
3510 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3511 | * packet must fill in the Verification Tag field of the outbound | |
3512 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
047a2428 JF |
3513 | * set the T-bit in the Chunk Flags to indicate that the Verification |
3514 | * Tag is reflected. | |
1da177e4 LT |
3515 | * |
3516 | * 8) The receiver should respond to the sender of the OOTB packet with | |
3517 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3518 | * MUST fill in the Verification Tag field of the outbound packet | |
3519 | * with the value found in the Verification Tag field of the OOTB | |
047a2428 JF |
3520 | * packet and set the T-bit in the Chunk Flags to indicate that the |
3521 | * Verification Tag is reflected. After sending this ABORT, the | |
3522 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3523 | * no further action. | |
1da177e4 | 3524 | */ |
172a1599 XL |
3525 | enum sctp_disposition sctp_sf_ootb(struct net *net, |
3526 | const struct sctp_endpoint *ep, | |
3527 | const struct sctp_association *asoc, | |
3528 | const union sctp_subtype type, | |
3529 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3530 | { |
3531 | struct sctp_chunk *chunk = arg; | |
3532 | struct sk_buff *skb = chunk->skb; | |
922dbc5b | 3533 | struct sctp_chunkhdr *ch; |
d8238d9d | 3534 | struct sctp_errhdr *err; |
85c5ed4e | 3535 | int ootb_cookie_ack = 0; |
172a1599 XL |
3536 | int ootb_shut_ack = 0; |
3537 | __u8 *ch_end; | |
1da177e4 | 3538 | |
b01a2407 | 3539 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
1da177e4 | 3540 | |
922dbc5b | 3541 | ch = (struct sctp_chunkhdr *)chunk->chunk_hdr; |
1da177e4 | 3542 | do { |
ece25dfa | 3543 | /* Report violation if the chunk is less then minimal */ |
922dbc5b | 3544 | if (ntohs(ch->length) < sizeof(*ch)) |
24cb81a6 | 3545 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 3546 | commands); |
1da177e4 | 3547 | |
bf911e98 MRL |
3548 | /* Report violation if chunk len overflows */ |
3549 | ch_end = ((__u8 *)ch) + SCTP_PAD4(ntohs(ch->length)); | |
3550 | if (ch_end > skb_tail_pointer(skb)) | |
3551 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3552 | commands); | |
3553 | ||
ece25dfa VY |
3554 | /* Now that we know we at least have a chunk header, |
3555 | * do things that are type appropriate. | |
3556 | */ | |
1da177e4 LT |
3557 | if (SCTP_CID_SHUTDOWN_ACK == ch->type) |
3558 | ootb_shut_ack = 1; | |
3559 | ||
3560 | /* RFC 2960, Section 3.3.7 | |
3561 | * Moreover, under any circumstances, an endpoint that | |
3562 | * receives an ABORT MUST NOT respond to that ABORT by | |
3563 | * sending an ABORT of its own. | |
3564 | */ | |
3565 | if (SCTP_CID_ABORT == ch->type) | |
24cb81a6 | 3566 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3567 | |
85c5ed4e SW |
3568 | /* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR |
3569 | * or a COOKIE ACK the SCTP Packet should be silently | |
3570 | * discarded. | |
3571 | */ | |
3572 | ||
3573 | if (SCTP_CID_COOKIE_ACK == ch->type) | |
3574 | ootb_cookie_ack = 1; | |
3575 | ||
3576 | if (SCTP_CID_ERROR == ch->type) { | |
3577 | sctp_walk_errors(err, ch) { | |
3578 | if (SCTP_ERROR_STALE_COOKIE == err->cause) { | |
3579 | ootb_cookie_ack = 1; | |
3580 | break; | |
3581 | } | |
3582 | } | |
3583 | } | |
3584 | ||
922dbc5b | 3585 | ch = (struct sctp_chunkhdr *)ch_end; |
27a884dc | 3586 | } while (ch_end < skb_tail_pointer(skb)); |
1da177e4 LT |
3587 | |
3588 | if (ootb_shut_ack) | |
24cb81a6 | 3589 | return sctp_sf_shut_8_4_5(net, ep, asoc, type, arg, commands); |
85c5ed4e | 3590 | else if (ootb_cookie_ack) |
24cb81a6 | 3591 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3592 | else |
24cb81a6 | 3593 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3594 | } |
3595 | ||
3596 | /* | |
3597 | * Handle an "Out of the blue" SHUTDOWN ACK. | |
3598 | * | |
047a2428 JF |
3599 | * Section: 8.4 5, sctpimpguide 2.41. |
3600 | * | |
1da177e4 | 3601 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
047a2428 JF |
3602 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. |
3603 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3604 | * packet must fill in the Verification Tag field of the outbound | |
3605 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
3606 | * set the T-bit in the Chunk Flags to indicate that the Verification | |
3607 | * Tag is reflected. | |
1da177e4 LT |
3608 | * |
3609 | * Inputs | |
3610 | * (endpoint, asoc, type, arg, commands) | |
3611 | * | |
3612 | * Outputs | |
172a1599 | 3613 | * (enum sctp_disposition) |
1da177e4 LT |
3614 | * |
3615 | * The return value is the disposition of the chunk. | |
3616 | */ | |
172a1599 XL |
3617 | static enum sctp_disposition sctp_sf_shut_8_4_5( |
3618 | struct net *net, | |
3619 | const struct sctp_endpoint *ep, | |
3620 | const struct sctp_association *asoc, | |
3621 | const union sctp_subtype type, | |
3622 | void *arg, | |
3623 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3624 | { |
3625 | struct sctp_packet *packet = NULL; | |
3626 | struct sctp_chunk *chunk = arg; | |
3627 | struct sctp_chunk *shut; | |
3628 | ||
2ce95503 | 3629 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1ff01561 MRL |
3630 | if (!packet) |
3631 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3632 | |
1ff01561 MRL |
3633 | /* Make an SHUTDOWN_COMPLETE. |
3634 | * The T bit will be set if the asoc is NULL. | |
3635 | */ | |
3636 | shut = sctp_make_shutdown_complete(asoc, chunk); | |
3637 | if (!shut) { | |
3638 | sctp_ootb_pkt_free(packet); | |
3639 | return SCTP_DISPOSITION_NOMEM; | |
3640 | } | |
047a2428 | 3641 | |
1ff01561 MRL |
3642 | /* Reflect vtag if T-Bit is set */ |
3643 | if (sctp_test_T_bit(shut)) | |
3644 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3645 | |
1ff01561 MRL |
3646 | /* Set the skb to the belonging sock for accounting. */ |
3647 | shut->skb->sk = ep->base.sk; | |
1da177e4 | 3648 | |
1ff01561 | 3649 | sctp_packet_append_chunk(packet, shut); |
1da177e4 | 3650 | |
1ff01561 MRL |
3651 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3652 | SCTP_PACKET(packet)); | |
1da177e4 | 3653 | |
1ff01561 | 3654 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3655 | |
1ff01561 MRL |
3656 | /* If the chunk length is invalid, we don't want to process |
3657 | * the reset of the packet. | |
3658 | */ | |
922dbc5b | 3659 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3660 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3661 | |
1ff01561 MRL |
3662 | /* We need to discard the rest of the packet to prevent |
3663 | * potential bomming attacks from additional bundled chunks. | |
3664 | * This is documented in SCTP Threats ID. | |
3665 | */ | |
3666 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1da177e4 LT |
3667 | } |
3668 | ||
3669 | /* | |
3670 | * Handle SHUTDOWN ACK in COOKIE_ECHOED or COOKIE_WAIT state. | |
3671 | * | |
3672 | * Verification Tag: 8.5.1 E) Rules for packet carrying a SHUTDOWN ACK | |
3673 | * If the receiver is in COOKIE-ECHOED or COOKIE-WAIT state the | |
3674 | * procedures in section 8.4 SHOULD be followed, in other words it | |
3675 | * should be treated as an Out Of The Blue packet. | |
3676 | * [This means that we do NOT check the Verification Tag on these | |
3677 | * chunks. --piggy ] | |
3678 | * | |
3679 | */ | |
172a1599 XL |
3680 | enum sctp_disposition sctp_sf_do_8_5_1_E_sa(struct net *net, |
3681 | const struct sctp_endpoint *ep, | |
3682 | const struct sctp_association *asoc, | |
3683 | const union sctp_subtype type, | |
3684 | void *arg, | |
3685 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3686 | { |
ece25dfa VY |
3687 | struct sctp_chunk *chunk = arg; |
3688 | ||
3689 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3690 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3691 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
3692 | commands); |
3693 | ||
1da177e4 LT |
3694 | /* Although we do have an association in this case, it corresponds |
3695 | * to a restarted association. So the packet is treated as an OOTB | |
3696 | * packet and the state function that handles OOTB SHUTDOWN_ACK is | |
3697 | * called with a NULL association. | |
3698 | */ | |
24cb81a6 | 3699 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
8190f89d | 3700 | |
24cb81a6 | 3701 | return sctp_sf_shut_8_4_5(net, ep, NULL, type, arg, commands); |
1da177e4 LT |
3702 | } |
3703 | ||
3704 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. */ | |
172a1599 XL |
3705 | enum sctp_disposition sctp_sf_do_asconf(struct net *net, |
3706 | const struct sctp_endpoint *ep, | |
3707 | const struct sctp_association *asoc, | |
3708 | const union sctp_subtype type, | |
3709 | void *arg, | |
3710 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3711 | { |
172a1599 XL |
3712 | struct sctp_paramhdr *err_param = NULL; |
3713 | struct sctp_chunk *asconf_ack = NULL; | |
3714 | struct sctp_chunk *chunk = arg; | |
3715 | struct sctp_addiphdr *hdr; | |
3716 | __u32 serial; | |
1da177e4 LT |
3717 | |
3718 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3719 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3720 | SCTP_NULL()); | |
24cb81a6 | 3721 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3722 | } |
3723 | ||
6afd2e83 VY |
3724 | /* ADD-IP: Section 4.1.1 |
3725 | * This chunk MUST be sent in an authenticated way by using | |
3726 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3727 | * is received unauthenticated it MUST be silently discarded as | |
3728 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3729 | */ | |
e1fc3b14 | 3730 | if (!net->sctp.addip_noauth && !chunk->auth) |
68d75469 XL |
3731 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
3732 | commands); | |
6afd2e83 | 3733 | |
1da177e4 | 3734 | /* Make sure that the ASCONF ADDIP chunk has a valid length. */ |
68d75469 | 3735 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_addip_chunk))) |
24cb81a6 | 3736 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3737 | commands); |
3738 | ||
65205cc4 | 3739 | hdr = (struct sctp_addiphdr *)chunk->skb->data; |
1da177e4 LT |
3740 | serial = ntohl(hdr->serial); |
3741 | ||
6f4c618d | 3742 | /* Verify the ASCONF chunk before processing it. */ |
9de7922b | 3743 | if (!sctp_verify_asconf(asoc, chunk, true, &err_param)) |
24cb81a6 | 3744 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3745 | (void *)err_param, commands); |
6f4c618d | 3746 | |
a08de64d | 3747 | /* ADDIP 5.2 E1) Compare the value of the serial number to the value |
1da177e4 | 3748 | * the endpoint stored in a new association variable |
d808ad9a | 3749 | * 'Peer-Serial-Number'. |
1da177e4 LT |
3750 | */ |
3751 | if (serial == asoc->peer.addip_serial + 1) { | |
a08de64d VY |
3752 | /* If this is the first instance of ASCONF in the packet, |
3753 | * we can clean our old ASCONF-ACKs. | |
3754 | */ | |
3755 | if (!chunk->has_asconf) | |
3756 | sctp_assoc_clean_asconf_ack_cache(asoc); | |
3757 | ||
3758 | /* ADDIP 5.2 E4) When the Sequence Number matches the next one | |
3759 | * expected, process the ASCONF as described below and after | |
3760 | * processing the ASCONF Chunk, append an ASCONF-ACK Chunk to | |
3761 | * the response packet and cache a copy of it (in the event it | |
3762 | * later needs to be retransmitted). | |
3763 | * | |
3764 | * Essentially, do V1-V5. | |
1da177e4 LT |
3765 | */ |
3766 | asconf_ack = sctp_process_asconf((struct sctp_association *) | |
3767 | asoc, chunk); | |
3768 | if (!asconf_ack) | |
3769 | return SCTP_DISPOSITION_NOMEM; | |
a08de64d VY |
3770 | } else if (serial < asoc->peer.addip_serial + 1) { |
3771 | /* ADDIP 5.2 E2) | |
3772 | * If the value found in the Sequence Number is less than the | |
3773 | * ('Peer- Sequence-Number' + 1), simply skip to the next | |
3774 | * ASCONF, and include in the outbound response packet | |
3775 | * any previously cached ASCONF-ACK response that was | |
3776 | * sent and saved that matches the Sequence Number of the | |
3777 | * ASCONF. Note: It is possible that no cached ASCONF-ACK | |
3778 | * Chunk exists. This will occur when an older ASCONF | |
3779 | * arrives out of order. In such a case, the receiver | |
3780 | * should skip the ASCONF Chunk and not include ASCONF-ACK | |
3781 | * Chunk for that chunk. | |
1da177e4 | 3782 | */ |
a08de64d VY |
3783 | asconf_ack = sctp_assoc_lookup_asconf_ack(asoc, hdr->serial); |
3784 | if (!asconf_ack) | |
1da177e4 | 3785 | return SCTP_DISPOSITION_DISCARD; |
31b02e15 VY |
3786 | |
3787 | /* Reset the transport so that we select the correct one | |
3788 | * this time around. This is to make sure that we don't | |
3789 | * accidentally use a stale transport that's been removed. | |
3790 | */ | |
3791 | asconf_ack->transport = NULL; | |
1da177e4 | 3792 | } else { |
a08de64d | 3793 | /* ADDIP 5.2 E5) Otherwise, the ASCONF Chunk is discarded since |
1da177e4 | 3794 | * it must be either a stale packet or from an attacker. |
d808ad9a | 3795 | */ |
1da177e4 LT |
3796 | return SCTP_DISPOSITION_DISCARD; |
3797 | } | |
3798 | ||
a08de64d VY |
3799 | /* ADDIP 5.2 E6) The destination address of the SCTP packet |
3800 | * containing the ASCONF-ACK Chunks MUST be the source address of | |
3801 | * the SCTP packet that held the ASCONF Chunks. | |
3802 | * | |
3803 | * To do this properly, we'll set the destination address of the chunk | |
3804 | * and at the transmit time, will try look up the transport to use. | |
3805 | * Since ASCONFs may be bundled, the correct transport may not be | |
94e2bd68 | 3806 | * created until we process the entire packet, thus this workaround. |
1da177e4 | 3807 | */ |
a08de64d | 3808 | asconf_ack->dest = chunk->source; |
1da177e4 | 3809 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asconf_ack)); |
6af29ccc | 3810 | if (asoc->new_transport) { |
f7010e61 | 3811 | sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport, commands); |
6af29ccc MH |
3812 | ((struct sctp_association *)asoc)->new_transport = NULL; |
3813 | } | |
d808ad9a | 3814 | |
1da177e4 LT |
3815 | return SCTP_DISPOSITION_CONSUME; |
3816 | } | |
3817 | ||
3818 | /* | |
3819 | * ADDIP Section 4.3 General rules for address manipulation | |
3820 | * When building TLV parameters for the ASCONF Chunk that will add or | |
3821 | * delete IP addresses the D0 to D13 rules should be applied: | |
3822 | */ | |
172a1599 XL |
3823 | enum sctp_disposition sctp_sf_do_asconf_ack(struct net *net, |
3824 | const struct sctp_endpoint *ep, | |
3825 | const struct sctp_association *asoc, | |
3826 | const union sctp_subtype type, | |
3827 | void *arg, | |
3828 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3829 | { |
172a1599 XL |
3830 | struct sctp_chunk *last_asconf = asoc->addip_last_asconf; |
3831 | struct sctp_paramhdr *err_param = NULL; | |
3832 | struct sctp_chunk *asconf_ack = arg; | |
3833 | struct sctp_addiphdr *addip_hdr; | |
3834 | __u32 sent_serial, rcvd_serial; | |
3835 | struct sctp_chunk *abort; | |
1da177e4 LT |
3836 | |
3837 | if (!sctp_vtag_verify(asconf_ack, asoc)) { | |
3838 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3839 | SCTP_NULL()); | |
24cb81a6 | 3840 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3841 | } |
3842 | ||
6afd2e83 VY |
3843 | /* ADD-IP, Section 4.1.2: |
3844 | * This chunk MUST be sent in an authenticated way by using | |
3845 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3846 | * is received unauthenticated it MUST be silently discarded as | |
3847 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3848 | */ | |
e1fc3b14 | 3849 | if (!net->sctp.addip_noauth && !asconf_ack->auth) |
68d75469 XL |
3850 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
3851 | commands); | |
6afd2e83 | 3852 | |
1da177e4 | 3853 | /* Make sure that the ADDIP chunk has a valid length. */ |
68d75469 XL |
3854 | if (!sctp_chunk_length_valid(asconf_ack, |
3855 | sizeof(struct sctp_addip_chunk))) | |
24cb81a6 | 3856 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3857 | commands); |
3858 | ||
65205cc4 | 3859 | addip_hdr = (struct sctp_addiphdr *)asconf_ack->skb->data; |
1da177e4 LT |
3860 | rcvd_serial = ntohl(addip_hdr->serial); |
3861 | ||
6f4c618d | 3862 | /* Verify the ASCONF-ACK chunk before processing it. */ |
9de7922b | 3863 | if (!sctp_verify_asconf(asoc, asconf_ack, false, &err_param)) |
24cb81a6 | 3864 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3865 | (void *)err_param, commands); |
6f4c618d | 3866 | |
1da177e4 | 3867 | if (last_asconf) { |
65205cc4 | 3868 | addip_hdr = (struct sctp_addiphdr *)last_asconf->subh.addip_hdr; |
1da177e4 LT |
3869 | sent_serial = ntohl(addip_hdr->serial); |
3870 | } else { | |
3871 | sent_serial = asoc->addip_serial - 1; | |
3872 | } | |
3873 | ||
3874 | /* D0) If an endpoint receives an ASCONF-ACK that is greater than or | |
3875 | * equal to the next serial number to be used but no ASCONF chunk is | |
3876 | * outstanding the endpoint MUST ABORT the association. Note that a | |
3877 | * sequence number is greater than if it is no more than 2^^31-1 | |
3878 | * larger than the current sequence number (using serial arithmetic). | |
3879 | */ | |
3880 | if (ADDIP_SERIAL_gte(rcvd_serial, sent_serial + 1) && | |
3881 | !(asoc->addip_last_asconf)) { | |
3882 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3883 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3884 | if (abort) { |
00f1c2df | 3885 | sctp_init_cause(abort, SCTP_ERROR_ASCONF_ACK, 0); |
1da177e4 LT |
3886 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3887 | SCTP_CHUNK(abort)); | |
3888 | } | |
3889 | /* We are going to ABORT, so we might as well stop | |
3890 | * processing the rest of the chunks in the packet. | |
3891 | */ | |
3892 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3893 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
cb3f837b | 3894 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3895 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 3896 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 3897 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 3898 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
3899 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
3900 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3901 | return SCTP_DISPOSITION_ABORT; |
3902 | } | |
3903 | ||
3904 | if ((rcvd_serial == sent_serial) && asoc->addip_last_asconf) { | |
3905 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3906 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
3907 | ||
3908 | if (!sctp_process_asconf_ack((struct sctp_association *)asoc, | |
c0786693 VY |
3909 | asconf_ack)) { |
3910 | /* Successfully processed ASCONF_ACK. We can | |
3911 | * release the next asconf if we have one. | |
3912 | */ | |
3913 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_NEXT_ASCONF, | |
3914 | SCTP_NULL()); | |
1da177e4 | 3915 | return SCTP_DISPOSITION_CONSUME; |
c0786693 | 3916 | } |
1da177e4 LT |
3917 | |
3918 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3919 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3920 | if (abort) { |
00f1c2df | 3921 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); |
1da177e4 LT |
3922 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3923 | SCTP_CHUNK(abort)); | |
3924 | } | |
3925 | /* We are going to ABORT, so we might as well stop | |
3926 | * processing the rest of the chunks in the packet. | |
3927 | */ | |
cb3f837b | 3928 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3929 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 3930 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 3931 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 3932 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
3933 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
3934 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3935 | return SCTP_DISPOSITION_ABORT; |
3936 | } | |
3937 | ||
3938 | return SCTP_DISPOSITION_DISCARD; | |
3939 | } | |
3940 | ||
2040d3d7 | 3941 | /* RE-CONFIG Section 5.2 Upon reception of an RECONF Chunk. */ |
172a1599 XL |
3942 | enum sctp_disposition sctp_sf_do_reconf(struct net *net, |
3943 | const struct sctp_endpoint *ep, | |
3944 | const struct sctp_association *asoc, | |
3945 | const union sctp_subtype type, | |
3946 | void *arg, | |
3947 | struct sctp_cmd_seq *commands) | |
2040d3d7 XL |
3948 | { |
3949 | struct sctp_paramhdr *err_param = NULL; | |
3950 | struct sctp_chunk *chunk = arg; | |
3951 | struct sctp_reconf_chunk *hdr; | |
3952 | union sctp_params param; | |
3953 | ||
3954 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3955 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3956 | SCTP_NULL()); | |
3957 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
3958 | } | |
3959 | ||
3960 | /* Make sure that the RECONF chunk has a valid length. */ | |
3961 | if (!sctp_chunk_length_valid(chunk, sizeof(*hdr))) | |
3962 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3963 | commands); | |
3964 | ||
3965 | if (!sctp_verify_reconf(asoc, chunk, &err_param)) | |
3966 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
3967 | (void *)err_param, commands); | |
3968 | ||
3969 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
3970 | sctp_walk_params(param, hdr, params) { | |
3971 | struct sctp_chunk *reply = NULL; | |
3972 | struct sctp_ulpevent *ev = NULL; | |
3973 | ||
3974 | if (param.p->type == SCTP_PARAM_RESET_OUT_REQUEST) | |
3975 | reply = sctp_process_strreset_outreq( | |
3976 | (struct sctp_association *)asoc, param, &ev); | |
3977 | else if (param.p->type == SCTP_PARAM_RESET_IN_REQUEST) | |
3978 | reply = sctp_process_strreset_inreq( | |
3979 | (struct sctp_association *)asoc, param, &ev); | |
692787ce XL |
3980 | else if (param.p->type == SCTP_PARAM_RESET_TSN_REQUEST) |
3981 | reply = sctp_process_strreset_tsnreq( | |
3982 | (struct sctp_association *)asoc, param, &ev); | |
50a41591 XL |
3983 | else if (param.p->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) |
3984 | reply = sctp_process_strreset_addstrm_out( | |
3985 | (struct sctp_association *)asoc, param, &ev); | |
c5c4ebb3 XL |
3986 | else if (param.p->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) |
3987 | reply = sctp_process_strreset_addstrm_in( | |
3988 | (struct sctp_association *)asoc, param, &ev); | |
11ae76e6 XL |
3989 | else if (param.p->type == SCTP_PARAM_RESET_RESPONSE) |
3990 | reply = sctp_process_strreset_resp( | |
3991 | (struct sctp_association *)asoc, param, &ev); | |
2040d3d7 XL |
3992 | |
3993 | if (ev) | |
3994 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
3995 | SCTP_ULPEVENT(ev)); | |
3996 | ||
3997 | if (reply) | |
3998 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
3999 | SCTP_CHUNK(reply)); | |
4000 | } | |
4001 | ||
4002 | return SCTP_DISPOSITION_CONSUME; | |
4003 | } | |
4004 | ||
1da177e4 LT |
4005 | /* |
4006 | * PR-SCTP Section 3.6 Receiver Side Implementation of PR-SCTP | |
4007 | * | |
4008 | * When a FORWARD TSN chunk arrives, the data receiver MUST first update | |
4009 | * its cumulative TSN point to the value carried in the FORWARD TSN | |
4010 | * chunk, and then MUST further advance its cumulative TSN point locally | |
4011 | * if possible. | |
4012 | * After the above processing, the data receiver MUST stop reporting any | |
4013 | * missing TSNs earlier than or equal to the new cumulative TSN point. | |
4014 | * | |
4015 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4016 | * | |
4017 | * The return value is the disposition of the chunk. | |
4018 | */ | |
172a1599 XL |
4019 | enum sctp_disposition sctp_sf_eat_fwd_tsn(struct net *net, |
4020 | const struct sctp_endpoint *ep, | |
4021 | const struct sctp_association *asoc, | |
4022 | const union sctp_subtype type, | |
4023 | void *arg, | |
4024 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4025 | { |
1da177e4 | 4026 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4027 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
4028 | __u16 len; |
4029 | __u32 tsn; | |
4030 | ||
4031 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4032 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4033 | SCTP_NULL()); | |
24cb81a6 | 4034 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4035 | } |
4036 | ||
d15c9ede XL |
4037 | if (!asoc->peer.prsctp_capable) |
4038 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4039 | ||
1da177e4 | 4040 | /* Make sure that the FORWARD_TSN chunk has valid length. */ |
0fc2ea92 | 4041 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 4042 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4043 | commands); |
4044 | ||
4045 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4046 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4047 | len = ntohs(chunk->chunk_hdr->length); | |
4048 | len -= sizeof(struct sctp_chunkhdr); | |
4049 | skb_pull(chunk->skb, len); | |
4050 | ||
4051 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4052 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4053 | |
4054 | /* The TSN is too high--silently discard the chunk and count on it | |
4055 | * getting retransmitted later. | |
4056 | */ | |
4057 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4058 | goto discard_noforce; | |
4059 | ||
0fc2ea92 XL |
4060 | if (!asoc->stream.si->validate_ftsn(chunk)) |
4061 | goto discard_noforce; | |
9fcb95a1 | 4062 | |
1da177e4 | 4063 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 4064 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 4065 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4066 | SCTP_CHUNK(chunk)); |
d808ad9a | 4067 | |
1da177e4 | 4068 | /* Count this as receiving DATA. */ |
9f70f46b | 4069 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
4070 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
4071 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
4072 | } | |
d808ad9a | 4073 | |
1da177e4 | 4074 | /* FIXME: For now send a SACK, but DATA processing may |
d808ad9a | 4075 | * send another. |
1da177e4 LT |
4076 | */ |
4077 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE()); | |
1da177e4 LT |
4078 | |
4079 | return SCTP_DISPOSITION_CONSUME; | |
4080 | ||
4081 | discard_noforce: | |
4082 | return SCTP_DISPOSITION_DISCARD; | |
4083 | } | |
4084 | ||
172a1599 XL |
4085 | enum sctp_disposition sctp_sf_eat_fwd_tsn_fast( |
4086 | struct net *net, | |
4087 | const struct sctp_endpoint *ep, | |
4088 | const struct sctp_association *asoc, | |
4089 | const union sctp_subtype type, | |
4090 | void *arg, | |
4091 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4092 | { |
1da177e4 | 4093 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4094 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
4095 | __u16 len; |
4096 | __u32 tsn; | |
4097 | ||
4098 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4099 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4100 | SCTP_NULL()); | |
24cb81a6 | 4101 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4102 | } |
4103 | ||
d15c9ede XL |
4104 | if (!asoc->peer.prsctp_capable) |
4105 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4106 | ||
1da177e4 | 4107 | /* Make sure that the FORWARD_TSN chunk has a valid length. */ |
0fc2ea92 | 4108 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 4109 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4110 | commands); |
4111 | ||
4112 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4113 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4114 | len = ntohs(chunk->chunk_hdr->length); | |
4115 | len -= sizeof(struct sctp_chunkhdr); | |
4116 | skb_pull(chunk->skb, len); | |
4117 | ||
4118 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4119 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4120 | |
4121 | /* The TSN is too high--silently discard the chunk and count on it | |
4122 | * getting retransmitted later. | |
4123 | */ | |
4124 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4125 | goto gen_shutdown; | |
4126 | ||
0fc2ea92 XL |
4127 | if (!asoc->stream.si->validate_ftsn(chunk)) |
4128 | goto gen_shutdown; | |
9fcb95a1 | 4129 | |
1da177e4 | 4130 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 4131 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 4132 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4133 | SCTP_CHUNK(chunk)); |
d808ad9a | 4134 | |
1da177e4 LT |
4135 | /* Go a head and force a SACK, since we are shutting down. */ |
4136 | gen_shutdown: | |
4137 | /* Implementor's Guide. | |
4138 | * | |
4139 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
4140 | * respond to each received packet containing one or more DATA chunk(s) | |
4141 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
4142 | */ | |
4143 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
4144 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
4145 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
4146 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
4147 | ||
d808ad9a | 4148 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4149 | } |
4150 | ||
bbd0d598 | 4151 | /* |
25985edc | 4152 | * SCTP-AUTH Section 6.3 Receiving authenticated chukns |
bbd0d598 VY |
4153 | * |
4154 | * The receiver MUST use the HMAC algorithm indicated in the HMAC | |
4155 | * Identifier field. If this algorithm was not specified by the | |
4156 | * receiver in the HMAC-ALGO parameter in the INIT or INIT-ACK chunk | |
4157 | * during association setup, the AUTH chunk and all chunks after it MUST | |
4158 | * be discarded and an ERROR chunk SHOULD be sent with the error cause | |
4159 | * defined in Section 4.1. | |
4160 | * | |
4161 | * If an endpoint with no shared key receives a Shared Key Identifier | |
4162 | * other than 0, it MUST silently discard all authenticated chunks. If | |
4163 | * the endpoint has at least one endpoint pair shared key for the peer, | |
4164 | * it MUST use the key specified by the Shared Key Identifier if a | |
4165 | * key has been configured for that Shared Key Identifier. If no | |
4166 | * endpoint pair shared key has been configured for that Shared Key | |
4167 | * Identifier, all authenticated chunks MUST be silently discarded. | |
4168 | * | |
4169 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4170 | * | |
4171 | * The return value is the disposition of the chunk. | |
4172 | */ | |
4785c7ae | 4173 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 XL |
4174 | struct net *net, |
4175 | const struct sctp_endpoint *ep, | |
4176 | const struct sctp_association *asoc, | |
4177 | const union sctp_subtype type, | |
4178 | struct sctp_chunk *chunk) | |
bbd0d598 | 4179 | { |
1b1e0bc9 | 4180 | struct sctp_shared_key *sh_key = NULL; |
bbd0d598 | 4181 | struct sctp_authhdr *auth_hdr; |
172a1599 | 4182 | __u8 *save_digest, *digest; |
bbd0d598 VY |
4183 | struct sctp_hmac *hmac; |
4184 | unsigned int sig_len; | |
4185 | __u16 key_id; | |
bbd0d598 VY |
4186 | |
4187 | /* Pull in the auth header, so we can do some more verification */ | |
4188 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
4189 | chunk->subh.auth_hdr = auth_hdr; | |
bb96dec7 | 4190 | skb_pull(chunk->skb, sizeof(*auth_hdr)); |
bbd0d598 | 4191 | |
02582e9b | 4192 | /* Make sure that we support the HMAC algorithm from the auth |
bbd0d598 VY |
4193 | * chunk. |
4194 | */ | |
4195 | if (!sctp_auth_asoc_verify_hmac_id(asoc, auth_hdr->hmac_id)) | |
4196 | return SCTP_IERROR_AUTH_BAD_HMAC; | |
4197 | ||
4198 | /* Make sure that the provided shared key identifier has been | |
4199 | * configured | |
4200 | */ | |
4201 | key_id = ntohs(auth_hdr->shkey_id); | |
1b1e0bc9 XL |
4202 | if (key_id != asoc->active_key_id) { |
4203 | sh_key = sctp_auth_get_shkey(asoc, key_id); | |
4204 | if (!sh_key) | |
4205 | return SCTP_IERROR_AUTH_BAD_KEYID; | |
4206 | } | |
bbd0d598 VY |
4207 | |
4208 | /* Make sure that the length of the signature matches what | |
4209 | * we expect. | |
4210 | */ | |
bb96dec7 XL |
4211 | sig_len = ntohs(chunk->chunk_hdr->length) - |
4212 | sizeof(struct sctp_auth_chunk); | |
bbd0d598 VY |
4213 | hmac = sctp_auth_get_hmac(ntohs(auth_hdr->hmac_id)); |
4214 | if (sig_len != hmac->hmac_len) | |
4215 | return SCTP_IERROR_PROTO_VIOLATION; | |
4216 | ||
4217 | /* Now that we've done validation checks, we can compute and | |
4218 | * verify the hmac. The steps involved are: | |
4219 | * 1. Save the digest from the chunk. | |
4220 | * 2. Zero out the digest in the chunk. | |
4221 | * 3. Compute the new digest | |
4222 | * 4. Compare saved and new digests. | |
4223 | */ | |
4224 | digest = auth_hdr->hmac; | |
4225 | skb_pull(chunk->skb, sig_len); | |
4226 | ||
4227 | save_digest = kmemdup(digest, sig_len, GFP_ATOMIC); | |
4228 | if (!save_digest) | |
4229 | goto nomem; | |
4230 | ||
4231 | memset(digest, 0, sig_len); | |
4232 | ||
4233 | sctp_auth_calculate_hmac(asoc, chunk->skb, | |
bb96dec7 | 4234 | (struct sctp_auth_chunk *)chunk->chunk_hdr, |
1b1e0bc9 | 4235 | sh_key, GFP_ATOMIC); |
bbd0d598 VY |
4236 | |
4237 | /* Discard the packet if the digests do not match */ | |
4238 | if (memcmp(save_digest, digest, sig_len)) { | |
4239 | kfree(save_digest); | |
4240 | return SCTP_IERROR_BAD_SIG; | |
4241 | } | |
4242 | ||
4243 | kfree(save_digest); | |
4244 | chunk->auth = 1; | |
4245 | ||
4246 | return SCTP_IERROR_NO_ERROR; | |
4247 | nomem: | |
4248 | return SCTP_IERROR_NOMEM; | |
4249 | } | |
4250 | ||
172a1599 XL |
4251 | enum sctp_disposition sctp_sf_eat_auth(struct net *net, |
4252 | const struct sctp_endpoint *ep, | |
4253 | const struct sctp_association *asoc, | |
4254 | const union sctp_subtype type, | |
4255 | void *arg, struct sctp_cmd_seq *commands) | |
bbd0d598 | 4256 | { |
bbd0d598 | 4257 | struct sctp_chunk *chunk = arg; |
4785c7ae | 4258 | struct sctp_authhdr *auth_hdr; |
bbd0d598 | 4259 | struct sctp_chunk *err_chunk; |
4785c7ae | 4260 | enum sctp_ierror error; |
bbd0d598 | 4261 | |
d2f19fa1 WY |
4262 | /* Make sure that the peer has AUTH capable */ |
4263 | if (!asoc->peer.auth_capable) | |
24cb81a6 | 4264 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); |
d2f19fa1 | 4265 | |
bbd0d598 VY |
4266 | if (!sctp_vtag_verify(chunk, asoc)) { |
4267 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4268 | SCTP_NULL()); | |
24cb81a6 | 4269 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 VY |
4270 | } |
4271 | ||
4272 | /* Make sure that the AUTH chunk has valid length. */ | |
4273 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_auth_chunk))) | |
24cb81a6 | 4274 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
bbd0d598 VY |
4275 | commands); |
4276 | ||
4277 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
24cb81a6 | 4278 | error = sctp_sf_authenticate(net, ep, asoc, type, chunk); |
bbd0d598 | 4279 | switch (error) { |
7fd71b1e JP |
4280 | case SCTP_IERROR_AUTH_BAD_HMAC: |
4281 | /* Generate the ERROR chunk and discard the rest | |
4282 | * of the packet | |
4283 | */ | |
4284 | err_chunk = sctp_make_op_error(asoc, chunk, | |
4285 | SCTP_ERROR_UNSUP_HMAC, | |
4286 | &auth_hdr->hmac_id, | |
4287 | sizeof(__u16), 0); | |
4288 | if (err_chunk) { | |
4289 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4290 | SCTP_CHUNK(err_chunk)); | |
4291 | } | |
4292 | /* Fall Through */ | |
4293 | case SCTP_IERROR_AUTH_BAD_KEYID: | |
4294 | case SCTP_IERROR_BAD_SIG: | |
24cb81a6 | 4295 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
7fd71b1e JP |
4296 | |
4297 | case SCTP_IERROR_PROTO_VIOLATION: | |
24cb81a6 | 4298 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
7fd71b1e JP |
4299 | commands); |
4300 | ||
4301 | case SCTP_IERROR_NOMEM: | |
4302 | return SCTP_DISPOSITION_NOMEM; | |
4303 | ||
4304 | default: /* Prevent gcc warnings */ | |
4305 | break; | |
bbd0d598 VY |
4306 | } |
4307 | ||
65b07e5d VY |
4308 | if (asoc->active_key_id != ntohs(auth_hdr->shkey_id)) { |
4309 | struct sctp_ulpevent *ev; | |
4310 | ||
4311 | ev = sctp_ulpevent_make_authkey(asoc, ntohs(auth_hdr->shkey_id), | |
ec2e506c | 4312 | SCTP_AUTH_NEW_KEY, GFP_ATOMIC); |
65b07e5d VY |
4313 | |
4314 | if (!ev) | |
4315 | return -ENOMEM; | |
4316 | ||
4317 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
4318 | SCTP_ULPEVENT(ev)); | |
4319 | } | |
4320 | ||
bbd0d598 VY |
4321 | return SCTP_DISPOSITION_CONSUME; |
4322 | } | |
4323 | ||
1da177e4 LT |
4324 | /* |
4325 | * Process an unknown chunk. | |
4326 | * | |
4327 | * Section: 3.2. Also, 2.1 in the implementor's guide. | |
4328 | * | |
4329 | * Chunk Types are encoded such that the highest-order two bits specify | |
4330 | * the action that must be taken if the processing endpoint does not | |
4331 | * recognize the Chunk Type. | |
4332 | * | |
4333 | * 00 - Stop processing this SCTP packet and discard it, do not process | |
4334 | * any further chunks within it. | |
4335 | * | |
4336 | * 01 - Stop processing this SCTP packet and discard it, do not process | |
4337 | * any further chunks within it, and report the unrecognized | |
4338 | * chunk in an 'Unrecognized Chunk Type'. | |
4339 | * | |
4340 | * 10 - Skip this chunk and continue processing. | |
4341 | * | |
4342 | * 11 - Skip this chunk and continue processing, but report in an ERROR | |
4343 | * Chunk using the 'Unrecognized Chunk Type' cause of error. | |
4344 | * | |
4345 | * The return value is the disposition of the chunk. | |
4346 | */ | |
172a1599 XL |
4347 | enum sctp_disposition sctp_sf_unk_chunk(struct net *net, |
4348 | const struct sctp_endpoint *ep, | |
4349 | const struct sctp_association *asoc, | |
4350 | const union sctp_subtype type, | |
4351 | void *arg, | |
4352 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4353 | { |
4354 | struct sctp_chunk *unk_chunk = arg; | |
4355 | struct sctp_chunk *err_chunk; | |
922dbc5b | 4356 | struct sctp_chunkhdr *hdr; |
1da177e4 | 4357 | |
bb33381d | 4358 | pr_debug("%s: processing unknown chunk id:%d\n", __func__, type.chunk); |
1da177e4 LT |
4359 | |
4360 | if (!sctp_vtag_verify(unk_chunk, asoc)) | |
24cb81a6 | 4361 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4362 | |
4363 | /* Make sure that the chunk has a valid length. | |
4364 | * Since we don't know the chunk type, we use a general | |
4365 | * chunkhdr structure to make a comparison. | |
4366 | */ | |
922dbc5b | 4367 | if (!sctp_chunk_length_valid(unk_chunk, sizeof(*hdr))) |
24cb81a6 | 4368 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4369 | commands); |
4370 | ||
4371 | switch (type.chunk & SCTP_CID_ACTION_MASK) { | |
4372 | case SCTP_CID_ACTION_DISCARD: | |
4373 | /* Discard the packet. */ | |
24cb81a6 | 4374 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4375 | case SCTP_CID_ACTION_DISCARD_ERR: |
1da177e4 LT |
4376 | /* Generate an ERROR chunk as response. */ |
4377 | hdr = unk_chunk->chunk_hdr; | |
4378 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4379 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4380 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4381 | 0); |
1da177e4 LT |
4382 | if (err_chunk) { |
4383 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4384 | SCTP_CHUNK(err_chunk)); | |
4385 | } | |
2e3216cd VY |
4386 | |
4387 | /* Discard the packet. */ | |
24cb81a6 | 4388 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4389 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4390 | case SCTP_CID_ACTION_SKIP: |
4391 | /* Skip the chunk. */ | |
4392 | return SCTP_DISPOSITION_DISCARD; | |
1da177e4 LT |
4393 | case SCTP_CID_ACTION_SKIP_ERR: |
4394 | /* Generate an ERROR chunk as response. */ | |
4395 | hdr = unk_chunk->chunk_hdr; | |
4396 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4397 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4398 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4399 | 0); |
1da177e4 LT |
4400 | if (err_chunk) { |
4401 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4402 | SCTP_CHUNK(err_chunk)); | |
4403 | } | |
4404 | /* Skip the chunk. */ | |
4405 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
4406 | default: |
4407 | break; | |
4408 | } | |
4409 | ||
4410 | return SCTP_DISPOSITION_DISCARD; | |
4411 | } | |
4412 | ||
4413 | /* | |
4414 | * Discard the chunk. | |
4415 | * | |
4416 | * Section: 0.2, 5.2.3, 5.2.5, 5.2.6, 6.0, 8.4.6, 8.5.1c, 9.2 | |
4417 | * [Too numerous to mention...] | |
4418 | * Verification Tag: No verification needed. | |
4419 | * Inputs | |
4420 | * (endpoint, asoc, chunk) | |
4421 | * | |
4422 | * Outputs | |
4423 | * (asoc, reply_msg, msg_up, timers, counters) | |
4424 | * | |
4425 | * The return value is the disposition of the chunk. | |
4426 | */ | |
172a1599 XL |
4427 | enum sctp_disposition sctp_sf_discard_chunk(struct net *net, |
4428 | const struct sctp_endpoint *ep, | |
4429 | const struct sctp_association *asoc, | |
4430 | const union sctp_subtype type, | |
4431 | void *arg, | |
4432 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4433 | { |
ece25dfa VY |
4434 | struct sctp_chunk *chunk = arg; |
4435 | ||
4436 | /* Make sure that the chunk has a valid length. | |
4437 | * Since we don't know the chunk type, we use a general | |
4438 | * chunkhdr structure to make a comparison. | |
4439 | */ | |
922dbc5b | 4440 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4441 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4442 | commands); |
4443 | ||
bb33381d DB |
4444 | pr_debug("%s: chunk:%d is discarded\n", __func__, type.chunk); |
4445 | ||
1da177e4 LT |
4446 | return SCTP_DISPOSITION_DISCARD; |
4447 | } | |
4448 | ||
4449 | /* | |
4450 | * Discard the whole packet. | |
4451 | * | |
4452 | * Section: 8.4 2) | |
4453 | * | |
4454 | * 2) If the OOTB packet contains an ABORT chunk, the receiver MUST | |
4455 | * silently discard the OOTB packet and take no further action. | |
1da177e4 LT |
4456 | * |
4457 | * Verification Tag: No verification necessary | |
4458 | * | |
4459 | * Inputs | |
4460 | * (endpoint, asoc, chunk) | |
4461 | * | |
4462 | * Outputs | |
4463 | * (asoc, reply_msg, msg_up, timers, counters) | |
4464 | * | |
4465 | * The return value is the disposition of the chunk. | |
4466 | */ | |
172a1599 XL |
4467 | enum sctp_disposition sctp_sf_pdiscard(struct net *net, |
4468 | const struct sctp_endpoint *ep, | |
4469 | const struct sctp_association *asoc, | |
4470 | const union sctp_subtype type, | |
4471 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 4472 | { |
24cb81a6 | 4473 | SCTP_INC_STATS(net, SCTP_MIB_IN_PKT_DISCARDS); |
1da177e4 LT |
4474 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
4475 | ||
4476 | return SCTP_DISPOSITION_CONSUME; | |
4477 | } | |
4478 | ||
4479 | ||
4480 | /* | |
4481 | * The other end is violating protocol. | |
4482 | * | |
4483 | * Section: Not specified | |
4484 | * Verification Tag: Not specified | |
4485 | * Inputs | |
4486 | * (endpoint, asoc, chunk) | |
4487 | * | |
4488 | * Outputs | |
4489 | * (asoc, reply_msg, msg_up, timers, counters) | |
4490 | * | |
4491 | * We simply tag the chunk as a violation. The state machine will log | |
4492 | * the violation and continue. | |
4493 | */ | |
172a1599 XL |
4494 | enum sctp_disposition sctp_sf_violation(struct net *net, |
4495 | const struct sctp_endpoint *ep, | |
4496 | const struct sctp_association *asoc, | |
4497 | const union sctp_subtype type, | |
4498 | void *arg, | |
4499 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4500 | { |
ece25dfa VY |
4501 | struct sctp_chunk *chunk = arg; |
4502 | ||
4503 | /* Make sure that the chunk has a valid length. */ | |
922dbc5b | 4504 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4505 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4506 | commands); |
4507 | ||
1da177e4 LT |
4508 | return SCTP_DISPOSITION_VIOLATION; |
4509 | } | |
4510 | ||
1da177e4 | 4511 | /* |
aecedeab | 4512 | * Common function to handle a protocol violation. |
1da177e4 | 4513 | */ |
172a1599 XL |
4514 | static enum sctp_disposition sctp_sf_abort_violation( |
4515 | struct net *net, | |
4516 | const struct sctp_endpoint *ep, | |
4517 | const struct sctp_association *asoc, | |
4518 | void *arg, | |
4519 | struct sctp_cmd_seq *commands, | |
4520 | const __u8 *payload, | |
4521 | const size_t paylen) | |
1da177e4 | 4522 | { |
ece25dfa | 4523 | struct sctp_packet *packet = NULL; |
1da177e4 LT |
4524 | struct sctp_chunk *chunk = arg; |
4525 | struct sctp_chunk *abort = NULL; | |
1da177e4 | 4526 | |
bbd0d598 VY |
4527 | /* SCTP-AUTH, Section 6.3: |
4528 | * It should be noted that if the receiver wants to tear | |
4529 | * down an association in an authenticated way only, the | |
4530 | * handling of malformed packets should not result in | |
4531 | * tearing down the association. | |
4532 | * | |
4533 | * This means that if we only want to abort associations | |
4534 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 4535 | * can't destroy this association just because the packet |
bbd0d598 VY |
4536 | * was malformed. |
4537 | */ | |
4538 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
4539 | goto discard; | |
4540 | ||
9abed245 JJ |
4541 | /* Make the abort chunk. */ |
4542 | abort = sctp_make_abort_violation(asoc, chunk, payload, paylen); | |
4543 | if (!abort) | |
4544 | goto nomem; | |
4545 | ||
ece25dfa | 4546 | if (asoc) { |
f4ad85ca GJ |
4547 | /* Treat INIT-ACK as a special case during COOKIE-WAIT. */ |
4548 | if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK && | |
4549 | !asoc->peer.i.init_tag) { | |
cb1844c4 | 4550 | struct sctp_initack_chunk *initack; |
f4ad85ca | 4551 | |
cb1844c4 XL |
4552 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
4553 | if (!sctp_chunk_length_valid(chunk, sizeof(*initack))) | |
f4ad85ca GJ |
4554 | abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T; |
4555 | else { | |
4556 | unsigned int inittag; | |
4557 | ||
4558 | inittag = ntohl(initack->init_hdr.init_tag); | |
4559 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG, | |
4560 | SCTP_U32(inittag)); | |
4561 | } | |
4562 | } | |
4563 | ||
ece25dfa | 4564 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
b01a2407 | 4565 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 4566 | |
ece25dfa VY |
4567 | if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) { |
4568 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
4569 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4570 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4571 | SCTP_ERROR(ECONNREFUSED)); | |
4572 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
4573 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
4574 | } else { | |
4575 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4576 | SCTP_ERROR(ECONNABORTED)); | |
4577 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4578 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 | 4579 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
ece25dfa | 4580 | } |
1da177e4 | 4581 | } else { |
2ce95503 | 4582 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
ece25dfa VY |
4583 | |
4584 | if (!packet) | |
4585 | goto nomem_pkt; | |
4586 | ||
4587 | if (sctp_test_T_bit(abort)) | |
4588 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
4589 | ||
4590 | abort->skb->sk = ep->base.sk; | |
4591 | ||
4592 | sctp_packet_append_chunk(packet, abort); | |
4593 | ||
4594 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
4595 | SCTP_PACKET(packet)); | |
4596 | ||
b01a2407 | 4597 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
4598 | } |
4599 | ||
b01a2407 | 4600 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
d808ad9a | 4601 | |
56eb82bb | 4602 | discard: |
24cb81a6 | 4603 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
1da177e4 LT |
4604 | return SCTP_DISPOSITION_ABORT; |
4605 | ||
ece25dfa VY |
4606 | nomem_pkt: |
4607 | sctp_chunk_free(abort); | |
1da177e4 LT |
4608 | nomem: |
4609 | return SCTP_DISPOSITION_NOMEM; | |
4610 | } | |
4611 | ||
aecedeab WY |
4612 | /* |
4613 | * Handle a protocol violation when the chunk length is invalid. | |
025dfdaf | 4614 | * "Invalid" length is identified as smaller than the minimal length a |
aecedeab | 4615 | * given chunk can be. For example, a SACK chunk has invalid length |
d4d6c614 | 4616 | * if its length is set to be smaller than the size of struct sctp_sack_chunk. |
aecedeab WY |
4617 | * |
4618 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4619 | * error code. | |
4620 | * | |
4621 | * Section: Not specified | |
4622 | * Verification Tag: Nothing to do | |
4623 | * Inputs | |
4624 | * (endpoint, asoc, chunk) | |
4625 | * | |
4626 | * Outputs | |
4627 | * (reply_msg, msg_up, counters) | |
4628 | * | |
4629 | * Generate an ABORT chunk and terminate the association. | |
4630 | */ | |
172a1599 XL |
4631 | static enum sctp_disposition sctp_sf_violation_chunklen( |
4632 | struct net *net, | |
4633 | const struct sctp_endpoint *ep, | |
4634 | const struct sctp_association *asoc, | |
4635 | const union sctp_subtype type, | |
4636 | void *arg, | |
4637 | struct sctp_cmd_seq *commands) | |
aecedeab | 4638 | { |
cb3f837b | 4639 | static const char err_str[] = "The following chunk had invalid length:"; |
aecedeab | 4640 | |
24cb81a6 | 4641 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4642 | sizeof(err_str)); |
aecedeab WY |
4643 | } |
4644 | ||
6f4c618d WY |
4645 | /* |
4646 | * Handle a protocol violation when the parameter length is invalid. | |
33c7cfdb SW |
4647 | * If the length is smaller than the minimum length of a given parameter, |
4648 | * or accumulated length in multi parameters exceeds the end of the chunk, | |
4649 | * the length is considered as invalid. | |
6f4c618d | 4650 | */ |
172a1599 XL |
4651 | static enum sctp_disposition sctp_sf_violation_paramlen( |
4652 | struct net *net, | |
4653 | const struct sctp_endpoint *ep, | |
4654 | const struct sctp_association *asoc, | |
4655 | const union sctp_subtype type, | |
4656 | void *arg, void *ext, | |
4657 | struct sctp_cmd_seq *commands) | |
ba016670 | 4658 | { |
ba016670 WY |
4659 | struct sctp_paramhdr *param = ext; |
4660 | struct sctp_chunk *abort = NULL; | |
172a1599 | 4661 | struct sctp_chunk *chunk = arg; |
6f4c618d | 4662 | |
ba016670 WY |
4663 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) |
4664 | goto discard; | |
4665 | ||
4666 | /* Make the abort chunk. */ | |
4667 | abort = sctp_make_violation_paramlen(asoc, chunk, param); | |
4668 | if (!abort) | |
4669 | goto nomem; | |
4670 | ||
4671 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
b01a2407 | 4672 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
ba016670 WY |
4673 | |
4674 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4675 | SCTP_ERROR(ECONNABORTED)); | |
4676 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4677 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 EB |
4678 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
4679 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
ba016670 WY |
4680 | |
4681 | discard: | |
24cb81a6 | 4682 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
ba016670 WY |
4683 | return SCTP_DISPOSITION_ABORT; |
4684 | nomem: | |
4685 | return SCTP_DISPOSITION_NOMEM; | |
6f4c618d WY |
4686 | } |
4687 | ||
aecedeab WY |
4688 | /* Handle a protocol violation when the peer trying to advance the |
4689 | * cumulative tsn ack to a point beyond the max tsn currently sent. | |
4690 | * | |
4691 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4692 | * error code. | |
4693 | */ | |
172a1599 XL |
4694 | static enum sctp_disposition sctp_sf_violation_ctsn( |
4695 | struct net *net, | |
4696 | const struct sctp_endpoint *ep, | |
4697 | const struct sctp_association *asoc, | |
4698 | const union sctp_subtype type, | |
4699 | void *arg, | |
4700 | struct sctp_cmd_seq *commands) | |
aecedeab | 4701 | { |
cb3f837b | 4702 | static const char err_str[] = "The cumulative tsn ack beyond the max tsn currently sent:"; |
aecedeab | 4703 | |
24cb81a6 | 4704 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4705 | sizeof(err_str)); |
aecedeab WY |
4706 | } |
4707 | ||
ece25dfa | 4708 | /* Handle protocol violation of an invalid chunk bundling. For example, |
25985edc | 4709 | * when we have an association and we receive bundled INIT-ACK, or |
ece25dfa | 4710 | * SHUDOWN-COMPLETE, our peer is clearly violationg the "MUST NOT bundle" |
25985edc | 4711 | * statement from the specs. Additionally, there might be an attacker |
ece25dfa VY |
4712 | * on the path and we may not want to continue this communication. |
4713 | */ | |
172a1599 XL |
4714 | static enum sctp_disposition sctp_sf_violation_chunk( |
4715 | struct net *net, | |
4716 | const struct sctp_endpoint *ep, | |
4717 | const struct sctp_association *asoc, | |
4718 | const union sctp_subtype type, | |
4719 | void *arg, | |
4720 | struct sctp_cmd_seq *commands) | |
ece25dfa | 4721 | { |
cb3f837b | 4722 | static const char err_str[] = "The following chunk violates protocol:"; |
ece25dfa VY |
4723 | |
4724 | if (!asoc) | |
24cb81a6 | 4725 | return sctp_sf_violation(net, ep, asoc, type, arg, commands); |
ece25dfa | 4726 | |
24cb81a6 | 4727 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4728 | sizeof(err_str)); |
ece25dfa | 4729 | } |
1da177e4 LT |
4730 | /*************************************************************************** |
4731 | * These are the state functions for handling primitive (Section 10) events. | |
4732 | ***************************************************************************/ | |
4733 | /* | |
4734 | * sctp_sf_do_prm_asoc | |
4735 | * | |
4736 | * Section: 10.1 ULP-to-SCTP | |
4737 | * B) Associate | |
4738 | * | |
4739 | * Format: ASSOCIATE(local SCTP instance name, destination transport addr, | |
4740 | * outbound stream count) | |
4741 | * -> association id [,destination transport addr list] [,outbound stream | |
4742 | * count] | |
4743 | * | |
4744 | * This primitive allows the upper layer to initiate an association to a | |
4745 | * specific peer endpoint. | |
4746 | * | |
4747 | * The peer endpoint shall be specified by one of the transport addresses | |
4748 | * which defines the endpoint (see Section 1.4). If the local SCTP | |
4749 | * instance has not been initialized, the ASSOCIATE is considered an | |
4750 | * error. | |
4751 | * [This is not relevant for the kernel implementation since we do all | |
4752 | * initialization at boot time. It we hadn't initialized we wouldn't | |
4753 | * get anywhere near this code.] | |
4754 | * | |
4755 | * An association id, which is a local handle to the SCTP association, | |
4756 | * will be returned on successful establishment of the association. If | |
4757 | * SCTP is not able to open an SCTP association with the peer endpoint, | |
4758 | * an error is returned. | |
4759 | * [In the kernel implementation, the struct sctp_association needs to | |
4760 | * be created BEFORE causing this primitive to run.] | |
4761 | * | |
4762 | * Other association parameters may be returned, including the | |
4763 | * complete destination transport addresses of the peer as well as the | |
4764 | * outbound stream count of the local endpoint. One of the transport | |
4765 | * address from the returned destination addresses will be selected by | |
4766 | * the local endpoint as default primary path for sending SCTP packets | |
4767 | * to this peer. The returned "destination transport addr list" can | |
4768 | * be used by the ULP to change the default primary path or to force | |
4769 | * sending a packet to a specific transport address. [All of this | |
4770 | * stuff happens when the INIT ACK arrives. This is a NON-BLOCKING | |
4771 | * function.] | |
4772 | * | |
4773 | * Mandatory attributes: | |
4774 | * | |
4775 | * o local SCTP instance name - obtained from the INITIALIZE operation. | |
4776 | * [This is the argument asoc.] | |
4777 | * o destination transport addr - specified as one of the transport | |
4778 | * addresses of the peer endpoint with which the association is to be | |
4779 | * established. | |
4780 | * [This is asoc->peer.active_path.] | |
4781 | * o outbound stream count - the number of outbound streams the ULP | |
4782 | * would like to open towards this peer endpoint. | |
4783 | * [BUG: This is not currently implemented.] | |
4784 | * Optional attributes: | |
4785 | * | |
4786 | * None. | |
4787 | * | |
4788 | * The return value is a disposition. | |
4789 | */ | |
172a1599 XL |
4790 | enum sctp_disposition sctp_sf_do_prm_asoc(struct net *net, |
4791 | const struct sctp_endpoint *ep, | |
4792 | const struct sctp_association *asoc, | |
4793 | const union sctp_subtype type, | |
4794 | void *arg, | |
4795 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4796 | { |
26ac8e5f | 4797 | struct sctp_association *my_asoc; |
172a1599 | 4798 | struct sctp_chunk *repl; |
1da177e4 LT |
4799 | |
4800 | /* The comment below says that we enter COOKIE-WAIT AFTER | |
4801 | * sending the INIT, but that doesn't actually work in our | |
4802 | * implementation... | |
4803 | */ | |
4804 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4805 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
4806 | ||
4807 | /* RFC 2960 5.1 Normal Establishment of an Association | |
4808 | * | |
4809 | * A) "A" first sends an INIT chunk to "Z". In the INIT, "A" | |
4810 | * must provide its Verification Tag (Tag_A) in the Initiate | |
4811 | * Tag field. Tag_A SHOULD be a random number in the range of | |
4812 | * 1 to 4294967295 (see 5.3.1 for Tag value selection). ... | |
4813 | */ | |
4814 | ||
4815 | repl = sctp_make_init(asoc, &asoc->base.bind_addr, GFP_ATOMIC, 0); | |
4816 | if (!repl) | |
4817 | goto nomem; | |
4818 | ||
405426f6 DB |
4819 | /* Choose transport for INIT. */ |
4820 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
4821 | SCTP_CHUNK(repl)); | |
4822 | ||
1da177e4 LT |
4823 | /* Cast away the const modifier, as we want to just |
4824 | * rerun it through as a sideffect. | |
4825 | */ | |
ab38fb04 VY |
4826 | my_asoc = (struct sctp_association *)asoc; |
4827 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(my_asoc)); | |
1da177e4 LT |
4828 | |
4829 | /* After sending the INIT, "A" starts the T1-init timer and | |
4830 | * enters the COOKIE-WAIT state. | |
4831 | */ | |
4832 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
4833 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4834 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
4835 | return SCTP_DISPOSITION_CONSUME; | |
4836 | ||
4837 | nomem: | |
4838 | return SCTP_DISPOSITION_NOMEM; | |
4839 | } | |
4840 | ||
4841 | /* | |
4842 | * Process the SEND primitive. | |
4843 | * | |
4844 | * Section: 10.1 ULP-to-SCTP | |
4845 | * E) Send | |
4846 | * | |
4847 | * Format: SEND(association id, buffer address, byte count [,context] | |
4848 | * [,stream id] [,life time] [,destination transport address] | |
4849 | * [,unorder flag] [,no-bundle flag] [,payload protocol-id] ) | |
4850 | * -> result | |
4851 | * | |
4852 | * This is the main method to send user data via SCTP. | |
4853 | * | |
4854 | * Mandatory attributes: | |
4855 | * | |
4856 | * o association id - local handle to the SCTP association | |
4857 | * | |
4858 | * o buffer address - the location where the user message to be | |
4859 | * transmitted is stored; | |
4860 | * | |
4861 | * o byte count - The size of the user data in number of bytes; | |
4862 | * | |
4863 | * Optional attributes: | |
4864 | * | |
4865 | * o context - an optional 32 bit integer that will be carried in the | |
4866 | * sending failure notification to the ULP if the transportation of | |
4867 | * this User Message fails. | |
4868 | * | |
4869 | * o stream id - to indicate which stream to send the data on. If not | |
4870 | * specified, stream 0 will be used. | |
4871 | * | |
4872 | * o life time - specifies the life time of the user data. The user data | |
4873 | * will not be sent by SCTP after the life time expires. This | |
4874 | * parameter can be used to avoid efforts to transmit stale | |
4875 | * user messages. SCTP notifies the ULP if the data cannot be | |
4876 | * initiated to transport (i.e. sent to the destination via SCTP's | |
4877 | * send primitive) within the life time variable. However, the | |
4878 | * user data will be transmitted if SCTP has attempted to transmit a | |
4879 | * chunk before the life time expired. | |
4880 | * | |
4881 | * o destination transport address - specified as one of the destination | |
4882 | * transport addresses of the peer endpoint to which this packet | |
4883 | * should be sent. Whenever possible, SCTP should use this destination | |
4884 | * transport address for sending the packets, instead of the current | |
4885 | * primary path. | |
4886 | * | |
4887 | * o unorder flag - this flag, if present, indicates that the user | |
4888 | * would like the data delivered in an unordered fashion to the peer | |
4889 | * (i.e., the U flag is set to 1 on all DATA chunks carrying this | |
4890 | * message). | |
4891 | * | |
4892 | * o no-bundle flag - instructs SCTP not to bundle this user data with | |
4893 | * other outbound DATA chunks. SCTP MAY still bundle even when | |
4894 | * this flag is present, when faced with network congestion. | |
4895 | * | |
4896 | * o payload protocol-id - A 32 bit unsigned integer that is to be | |
4897 | * passed to the peer indicating the type of payload protocol data | |
4898 | * being transmitted. This value is passed as opaque data by SCTP. | |
4899 | * | |
4900 | * The return value is the disposition. | |
4901 | */ | |
172a1599 XL |
4902 | enum sctp_disposition sctp_sf_do_prm_send(struct net *net, |
4903 | const struct sctp_endpoint *ep, | |
4904 | const struct sctp_association *asoc, | |
4905 | const union sctp_subtype type, | |
4906 | void *arg, | |
4907 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4908 | { |
9c5c62be | 4909 | struct sctp_datamsg *msg = arg; |
1da177e4 | 4910 | |
9c5c62be | 4911 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_MSG, SCTP_DATAMSG(msg)); |
1da177e4 LT |
4912 | return SCTP_DISPOSITION_CONSUME; |
4913 | } | |
4914 | ||
4915 | /* | |
4916 | * Process the SHUTDOWN primitive. | |
4917 | * | |
4918 | * Section: 10.1: | |
4919 | * C) Shutdown | |
4920 | * | |
4921 | * Format: SHUTDOWN(association id) | |
4922 | * -> result | |
4923 | * | |
4924 | * Gracefully closes an association. Any locally queued user data | |
4925 | * will be delivered to the peer. The association will be terminated only | |
4926 | * after the peer acknowledges all the SCTP packets sent. A success code | |
4927 | * will be returned on successful termination of the association. If | |
4928 | * attempting to terminate the association results in a failure, an error | |
4929 | * code shall be returned. | |
4930 | * | |
4931 | * Mandatory attributes: | |
4932 | * | |
4933 | * o association id - local handle to the SCTP association | |
4934 | * | |
4935 | * Optional attributes: | |
4936 | * | |
4937 | * None. | |
4938 | * | |
4939 | * The return value is the disposition. | |
4940 | */ | |
172a1599 XL |
4941 | enum sctp_disposition sctp_sf_do_9_2_prm_shutdown( |
4942 | struct net *net, | |
4943 | const struct sctp_endpoint *ep, | |
4944 | const struct sctp_association *asoc, | |
4945 | const union sctp_subtype type, | |
4946 | void *arg, | |
4947 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4948 | { |
172a1599 | 4949 | enum sctp_disposition disposition; |
1da177e4 LT |
4950 | |
4951 | /* From 9.2 Shutdown of an Association | |
4952 | * Upon receipt of the SHUTDOWN primitive from its upper | |
4953 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
4954 | * remains there until all outstanding data has been | |
4955 | * acknowledged by its peer. The endpoint accepts no new data | |
4956 | * from its upper layer, but retransmits data to the far end | |
4957 | * if necessary to fill gaps. | |
4958 | */ | |
4959 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4960 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
4961 | ||
1da177e4 LT |
4962 | disposition = SCTP_DISPOSITION_CONSUME; |
4963 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 4964 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
4965 | arg, commands); |
4966 | } | |
172a1599 | 4967 | |
1da177e4 LT |
4968 | return disposition; |
4969 | } | |
4970 | ||
4971 | /* | |
4972 | * Process the ABORT primitive. | |
4973 | * | |
4974 | * Section: 10.1: | |
4975 | * C) Abort | |
4976 | * | |
4977 | * Format: Abort(association id [, cause code]) | |
4978 | * -> result | |
4979 | * | |
4980 | * Ungracefully closes an association. Any locally queued user data | |
4981 | * will be discarded and an ABORT chunk is sent to the peer. A success code | |
4982 | * will be returned on successful abortion of the association. If | |
4983 | * attempting to abort the association results in a failure, an error | |
4984 | * code shall be returned. | |
4985 | * | |
4986 | * Mandatory attributes: | |
4987 | * | |
4988 | * o association id - local handle to the SCTP association | |
4989 | * | |
4990 | * Optional attributes: | |
4991 | * | |
4992 | * o cause code - reason of the abort to be passed to the peer | |
4993 | * | |
4994 | * None. | |
4995 | * | |
4996 | * The return value is the disposition. | |
4997 | */ | |
172a1599 XL |
4998 | enum sctp_disposition sctp_sf_do_9_1_prm_abort( |
4999 | struct net *net, | |
5000 | const struct sctp_endpoint *ep, | |
5001 | const struct sctp_association *asoc, | |
5002 | const union sctp_subtype type, | |
5003 | void *arg, | |
5004 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5005 | { |
5006 | /* From 9.1 Abort of an Association | |
5007 | * Upon receipt of the ABORT primitive from its upper | |
5008 | * layer, the endpoint enters CLOSED state and | |
5009 | * discard all outstanding data has been | |
5010 | * acknowledged by its peer. The endpoint accepts no new data | |
5011 | * from its upper layer, but retransmits data to the far end | |
5012 | * if necessary to fill gaps. | |
5013 | */ | |
c164a9ba | 5014 | struct sctp_chunk *abort = arg; |
1da177e4 | 5015 | |
068d8bd3 XL |
5016 | if (abort) |
5017 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5018 | |
5019 | /* Even if we can't send the ABORT due to low memory delete the | |
5020 | * TCB. This is a departure from our typical NOMEM handling. | |
5021 | */ | |
5022 | ||
8de8c873 SS |
5023 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5024 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 LT |
5025 | /* Delete the established association. */ |
5026 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 5027 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5028 | |
b01a2407 EB |
5029 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5030 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 | 5031 | |
649621e3 | 5032 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5033 | } |
5034 | ||
5035 | /* We tried an illegal operation on an association which is closed. */ | |
172a1599 XL |
5036 | enum sctp_disposition sctp_sf_error_closed(struct net *net, |
5037 | const struct sctp_endpoint *ep, | |
5038 | const struct sctp_association *asoc, | |
5039 | const union sctp_subtype type, | |
5040 | void *arg, | |
5041 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5042 | { |
5043 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, SCTP_ERROR(-EINVAL)); | |
5044 | return SCTP_DISPOSITION_CONSUME; | |
5045 | } | |
5046 | ||
5047 | /* We tried an illegal operation on an association which is shutting | |
5048 | * down. | |
5049 | */ | |
172a1599 XL |
5050 | enum sctp_disposition sctp_sf_error_shutdown( |
5051 | struct net *net, | |
5052 | const struct sctp_endpoint *ep, | |
5053 | const struct sctp_association *asoc, | |
5054 | const union sctp_subtype type, | |
5055 | void *arg, | |
5056 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5057 | { |
5058 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, | |
5059 | SCTP_ERROR(-ESHUTDOWN)); | |
5060 | return SCTP_DISPOSITION_CONSUME; | |
5061 | } | |
5062 | ||
5063 | /* | |
5064 | * sctp_cookie_wait_prm_shutdown | |
5065 | * | |
5066 | * Section: 4 Note: 2 | |
5067 | * Verification Tag: | |
5068 | * Inputs | |
5069 | * (endpoint, asoc) | |
5070 | * | |
5071 | * The RFC does not explicitly address this issue, but is the route through the | |
5072 | * state table when someone issues a shutdown while in COOKIE_WAIT state. | |
5073 | * | |
5074 | * Outputs | |
5075 | * (timers) | |
5076 | */ | |
172a1599 XL |
5077 | enum sctp_disposition sctp_sf_cookie_wait_prm_shutdown( |
5078 | struct net *net, | |
5079 | const struct sctp_endpoint *ep, | |
5080 | const struct sctp_association *asoc, | |
5081 | const union sctp_subtype type, | |
5082 | void *arg, | |
5083 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5084 | { |
5085 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5086 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5087 | ||
5088 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5089 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5090 | ||
b01a2407 | 5091 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
1da177e4 LT |
5092 | |
5093 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
5094 | ||
5095 | return SCTP_DISPOSITION_DELETE_TCB; | |
5096 | } | |
5097 | ||
5098 | /* | |
5099 | * sctp_cookie_echoed_prm_shutdown | |
5100 | * | |
5101 | * Section: 4 Note: 2 | |
5102 | * Verification Tag: | |
5103 | * Inputs | |
5104 | * (endpoint, asoc) | |
5105 | * | |
5106 | * The RFC does not explcitly address this issue, but is the route through the | |
5107 | * state table when someone issues a shutdown while in COOKIE_ECHOED state. | |
5108 | * | |
5109 | * Outputs | |
5110 | * (timers) | |
5111 | */ | |
172a1599 XL |
5112 | enum sctp_disposition sctp_sf_cookie_echoed_prm_shutdown( |
5113 | struct net *net, | |
5114 | const struct sctp_endpoint *ep, | |
5115 | const struct sctp_association *asoc, | |
5116 | const union sctp_subtype type, | |
5117 | void *arg, | |
5118 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5119 | { |
5120 | /* There is a single T1 timer, so we should be able to use | |
5121 | * common function with the COOKIE-WAIT state. | |
5122 | */ | |
24cb81a6 | 5123 | return sctp_sf_cookie_wait_prm_shutdown(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5124 | } |
5125 | ||
5126 | /* | |
5127 | * sctp_sf_cookie_wait_prm_abort | |
5128 | * | |
5129 | * Section: 4 Note: 2 | |
5130 | * Verification Tag: | |
5131 | * Inputs | |
5132 | * (endpoint, asoc) | |
5133 | * | |
5134 | * The RFC does not explicitly address this issue, but is the route through the | |
5135 | * state table when someone issues an abort while in COOKIE_WAIT state. | |
5136 | * | |
5137 | * Outputs | |
5138 | * (timers) | |
5139 | */ | |
172a1599 XL |
5140 | enum sctp_disposition sctp_sf_cookie_wait_prm_abort( |
5141 | struct net *net, | |
5142 | const struct sctp_endpoint *ep, | |
5143 | const struct sctp_association *asoc, | |
5144 | const union sctp_subtype type, | |
5145 | void *arg, | |
5146 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5147 | { |
c164a9ba | 5148 | struct sctp_chunk *abort = arg; |
1da177e4 LT |
5149 | |
5150 | /* Stop T1-init timer */ | |
5151 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5152 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1da177e4 | 5153 | |
068d8bd3 XL |
5154 | if (abort) |
5155 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5156 | |
5157 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5158 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5159 | ||
b01a2407 | 5160 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
5161 | |
5162 | /* Even if we can't send the ABORT due to low memory delete the | |
5163 | * TCB. This is a departure from our typical NOMEM handling. | |
5164 | */ | |
5165 | ||
8de8c873 SS |
5166 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5167 | SCTP_ERROR(ECONNREFUSED)); | |
1da177e4 LT |
5168 | /* Delete the established association. */ |
5169 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 5170 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5171 | |
649621e3 | 5172 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5173 | } |
5174 | ||
5175 | /* | |
5176 | * sctp_sf_cookie_echoed_prm_abort | |
5177 | * | |
5178 | * Section: 4 Note: 3 | |
5179 | * Verification Tag: | |
5180 | * Inputs | |
5181 | * (endpoint, asoc) | |
5182 | * | |
5183 | * The RFC does not explcitly address this issue, but is the route through the | |
5184 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5185 | * | |
5186 | * Outputs | |
5187 | * (timers) | |
5188 | */ | |
172a1599 XL |
5189 | enum sctp_disposition sctp_sf_cookie_echoed_prm_abort( |
5190 | struct net *net, | |
5191 | const struct sctp_endpoint *ep, | |
5192 | const struct sctp_association *asoc, | |
5193 | const union sctp_subtype type, | |
5194 | void *arg, | |
5195 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5196 | { |
5197 | /* There is a single T1 timer, so we should be able to use | |
5198 | * common function with the COOKIE-WAIT state. | |
5199 | */ | |
24cb81a6 | 5200 | return sctp_sf_cookie_wait_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5201 | } |
5202 | ||
5203 | /* | |
5204 | * sctp_sf_shutdown_pending_prm_abort | |
5205 | * | |
5206 | * Inputs | |
5207 | * (endpoint, asoc) | |
5208 | * | |
5209 | * The RFC does not explicitly address this issue, but is the route through the | |
5210 | * state table when someone issues an abort while in SHUTDOWN-PENDING state. | |
5211 | * | |
5212 | * Outputs | |
5213 | * (timers) | |
5214 | */ | |
172a1599 XL |
5215 | enum sctp_disposition sctp_sf_shutdown_pending_prm_abort( |
5216 | struct net *net, | |
5217 | const struct sctp_endpoint *ep, | |
5218 | const struct sctp_association *asoc, | |
5219 | const union sctp_subtype type, | |
5220 | void *arg, | |
5221 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5222 | { |
5223 | /* Stop the T5-shutdown guard timer. */ | |
5224 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5225 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5226 | ||
24cb81a6 | 5227 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5228 | } |
5229 | ||
5230 | /* | |
5231 | * sctp_sf_shutdown_sent_prm_abort | |
5232 | * | |
5233 | * Inputs | |
5234 | * (endpoint, asoc) | |
5235 | * | |
5236 | * The RFC does not explicitly address this issue, but is the route through the | |
5237 | * state table when someone issues an abort while in SHUTDOWN-SENT state. | |
5238 | * | |
5239 | * Outputs | |
5240 | * (timers) | |
5241 | */ | |
172a1599 XL |
5242 | enum sctp_disposition sctp_sf_shutdown_sent_prm_abort( |
5243 | struct net *net, | |
5244 | const struct sctp_endpoint *ep, | |
5245 | const struct sctp_association *asoc, | |
5246 | const union sctp_subtype type, | |
5247 | void *arg, | |
5248 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5249 | { |
5250 | /* Stop the T2-shutdown timer. */ | |
5251 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5252 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5253 | ||
5254 | /* Stop the T5-shutdown guard timer. */ | |
5255 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5256 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5257 | ||
24cb81a6 | 5258 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5259 | } |
5260 | ||
5261 | /* | |
5262 | * sctp_sf_cookie_echoed_prm_abort | |
5263 | * | |
5264 | * Inputs | |
5265 | * (endpoint, asoc) | |
5266 | * | |
5267 | * The RFC does not explcitly address this issue, but is the route through the | |
5268 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5269 | * | |
5270 | * Outputs | |
5271 | * (timers) | |
5272 | */ | |
172a1599 XL |
5273 | enum sctp_disposition sctp_sf_shutdown_ack_sent_prm_abort( |
5274 | struct net *net, | |
5275 | const struct sctp_endpoint *ep, | |
5276 | const struct sctp_association *asoc, | |
5277 | const union sctp_subtype type, | |
5278 | void *arg, | |
5279 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5280 | { |
5281 | /* The same T2 timer, so we should be able to use | |
5282 | * common function with the SHUTDOWN-SENT state. | |
5283 | */ | |
24cb81a6 | 5284 | return sctp_sf_shutdown_sent_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5285 | } |
5286 | ||
5287 | /* | |
5288 | * Process the REQUESTHEARTBEAT primitive | |
5289 | * | |
5290 | * 10.1 ULP-to-SCTP | |
5291 | * J) Request Heartbeat | |
5292 | * | |
5293 | * Format: REQUESTHEARTBEAT(association id, destination transport address) | |
5294 | * | |
5295 | * -> result | |
5296 | * | |
5297 | * Instructs the local endpoint to perform a HeartBeat on the specified | |
5298 | * destination transport address of the given association. The returned | |
5299 | * result should indicate whether the transmission of the HEARTBEAT | |
5300 | * chunk to the destination address is successful. | |
5301 | * | |
5302 | * Mandatory attributes: | |
5303 | * | |
5304 | * o association id - local handle to the SCTP association | |
5305 | * | |
5306 | * o destination transport address - the transport address of the | |
5307 | * association on which a heartbeat should be issued. | |
5308 | */ | |
172a1599 | 5309 | enum sctp_disposition sctp_sf_do_prm_requestheartbeat( |
24cb81a6 | 5310 | struct net *net, |
1da177e4 LT |
5311 | const struct sctp_endpoint *ep, |
5312 | const struct sctp_association *asoc, | |
bfc6f827 | 5313 | const union sctp_subtype type, |
1da177e4 | 5314 | void *arg, |
a85bbeb2 | 5315 | struct sctp_cmd_seq *commands) |
1da177e4 | 5316 | { |
fb78525a VY |
5317 | if (SCTP_DISPOSITION_NOMEM == sctp_sf_heartbeat(ep, asoc, type, |
5318 | (struct sctp_transport *)arg, commands)) | |
5319 | return SCTP_DISPOSITION_NOMEM; | |
5320 | ||
5321 | /* | |
5322 | * RFC 2960 (bis), section 8.3 | |
5323 | * | |
5324 | * D) Request an on-demand HEARTBEAT on a specific destination | |
5325 | * transport address of a given association. | |
5326 | * | |
5327 | * The endpoint should increment the respective error counter of | |
5328 | * the destination transport address each time a HEARTBEAT is sent | |
5329 | * to that address and not acknowledged within one RTO. | |
5330 | * | |
5331 | */ | |
7e99013a | 5332 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
fb78525a VY |
5333 | SCTP_TRANSPORT(arg)); |
5334 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5335 | } |
5336 | ||
5337 | /* | |
5338 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
5339 | * When an endpoint has an ASCONF signaled change to be sent to the | |
5340 | * remote endpoint it should do A1 to A9 | |
5341 | */ | |
172a1599 XL |
5342 | enum sctp_disposition sctp_sf_do_prm_asconf(struct net *net, |
5343 | const struct sctp_endpoint *ep, | |
5344 | const struct sctp_association *asoc, | |
5345 | const union sctp_subtype type, | |
5346 | void *arg, | |
5347 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5348 | { |
5349 | struct sctp_chunk *chunk = arg; | |
5350 | ||
5351 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5352 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5353 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5354 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5355 | return SCTP_DISPOSITION_CONSUME; | |
5356 | } | |
5357 | ||
7a090b04 | 5358 | /* RE-CONFIG Section 5.1 RECONF Chunk Procedures */ |
172a1599 XL |
5359 | enum sctp_disposition sctp_sf_do_prm_reconf(struct net *net, |
5360 | const struct sctp_endpoint *ep, | |
5361 | const struct sctp_association *asoc, | |
5362 | const union sctp_subtype type, | |
5363 | void *arg, | |
5364 | struct sctp_cmd_seq *commands) | |
7a090b04 XL |
5365 | { |
5366 | struct sctp_chunk *chunk = arg; | |
5367 | ||
5368 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5369 | return SCTP_DISPOSITION_CONSUME; | |
5370 | } | |
5371 | ||
1da177e4 LT |
5372 | /* |
5373 | * Ignore the primitive event | |
5374 | * | |
5375 | * The return value is the disposition of the primitive. | |
5376 | */ | |
172a1599 XL |
5377 | enum sctp_disposition sctp_sf_ignore_primitive( |
5378 | struct net *net, | |
5379 | const struct sctp_endpoint *ep, | |
5380 | const struct sctp_association *asoc, | |
5381 | const union sctp_subtype type, | |
5382 | void *arg, | |
5383 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5384 | { |
bb33381d DB |
5385 | pr_debug("%s: primitive type:%d is ignored\n", __func__, |
5386 | type.primitive); | |
5387 | ||
1da177e4 LT |
5388 | return SCTP_DISPOSITION_DISCARD; |
5389 | } | |
5390 | ||
5391 | /*************************************************************************** | |
5392 | * These are the state functions for the OTHER events. | |
5393 | ***************************************************************************/ | |
5394 | ||
e1cdd553 WY |
5395 | /* |
5396 | * When the SCTP stack has no more user data to send or retransmit, this | |
5397 | * notification is given to the user. Also, at the time when a user app | |
5398 | * subscribes to this event, if there is no data to be sent or | |
5399 | * retransmit, the stack will immediately send up this notification. | |
5400 | */ | |
172a1599 XL |
5401 | enum sctp_disposition sctp_sf_do_no_pending_tsn( |
5402 | struct net *net, | |
5403 | const struct sctp_endpoint *ep, | |
5404 | const struct sctp_association *asoc, | |
5405 | const union sctp_subtype type, | |
5406 | void *arg, | |
5407 | struct sctp_cmd_seq *commands) | |
e1cdd553 WY |
5408 | { |
5409 | struct sctp_ulpevent *event; | |
5410 | ||
5411 | event = sctp_ulpevent_make_sender_dry_event(asoc, GFP_ATOMIC); | |
5412 | if (!event) | |
5413 | return SCTP_DISPOSITION_NOMEM; | |
5414 | ||
5415 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(event)); | |
5416 | ||
5417 | return SCTP_DISPOSITION_CONSUME; | |
5418 | } | |
5419 | ||
1da177e4 LT |
5420 | /* |
5421 | * Start the shutdown negotiation. | |
5422 | * | |
5423 | * From Section 9.2: | |
5424 | * Once all its outstanding data has been acknowledged, the endpoint | |
5425 | * shall send a SHUTDOWN chunk to its peer including in the Cumulative | |
5426 | * TSN Ack field the last sequential TSN it has received from the peer. | |
5427 | * It shall then start the T2-shutdown timer and enter the SHUTDOWN-SENT | |
5428 | * state. If the timer expires, the endpoint must re-send the SHUTDOWN | |
5429 | * with the updated last sequential TSN received from its peer. | |
5430 | * | |
5431 | * The return value is the disposition. | |
5432 | */ | |
172a1599 XL |
5433 | enum sctp_disposition sctp_sf_do_9_2_start_shutdown( |
5434 | struct net *net, | |
5435 | const struct sctp_endpoint *ep, | |
5436 | const struct sctp_association *asoc, | |
5437 | const union sctp_subtype type, | |
5438 | void *arg, | |
5439 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5440 | { |
5441 | struct sctp_chunk *reply; | |
5442 | ||
5443 | /* Once all its outstanding data has been acknowledged, the | |
5444 | * endpoint shall send a SHUTDOWN chunk to its peer including | |
5445 | * in the Cumulative TSN Ack field the last sequential TSN it | |
5446 | * has received from the peer. | |
5447 | */ | |
5448 | reply = sctp_make_shutdown(asoc, NULL); | |
5449 | if (!reply) | |
5450 | goto nomem; | |
5451 | ||
5452 | /* Set the transport for the SHUTDOWN chunk and the timeout for the | |
5453 | * T2-shutdown timer. | |
5454 | */ | |
5455 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5456 | ||
5457 | /* It shall then start the T2-shutdown timer */ | |
5458 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5459 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5460 | ||
536428a9 WY |
5461 | /* RFC 4960 Section 9.2 |
5462 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5463 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5464 | */ | |
f8d96052 | 5465 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
536428a9 WY |
5466 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
5467 | ||
9f70f46b | 5468 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5469 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5470 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5471 | ||
5472 | /* and enter the SHUTDOWN-SENT state. */ | |
5473 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5474 | SCTP_STATE(SCTP_STATE_SHUTDOWN_SENT)); | |
5475 | ||
5476 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5477 | * | |
5478 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5479 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5480 | */ |
5481 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5482 | ||
5483 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5484 | ||
5485 | return SCTP_DISPOSITION_CONSUME; | |
5486 | ||
5487 | nomem: | |
5488 | return SCTP_DISPOSITION_NOMEM; | |
5489 | } | |
5490 | ||
5491 | /* | |
5492 | * Generate a SHUTDOWN ACK now that everything is SACK'd. | |
5493 | * | |
5494 | * From Section 9.2: | |
5495 | * | |
5496 | * If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5497 | * shall send a SHUTDOWN ACK and start a T2-shutdown timer of its own, | |
5498 | * entering the SHUTDOWN-ACK-SENT state. If the timer expires, the | |
5499 | * endpoint must re-send the SHUTDOWN ACK. | |
5500 | * | |
5501 | * The return value is the disposition. | |
5502 | */ | |
172a1599 XL |
5503 | enum sctp_disposition sctp_sf_do_9_2_shutdown_ack( |
5504 | struct net *net, | |
5505 | const struct sctp_endpoint *ep, | |
5506 | const struct sctp_association *asoc, | |
5507 | const union sctp_subtype type, | |
5508 | void *arg, | |
5509 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5510 | { |
172a1599 | 5511 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
5512 | struct sctp_chunk *reply; |
5513 | ||
5514 | /* There are 2 ways of getting here: | |
5515 | * 1) called in response to a SHUTDOWN chunk | |
5516 | * 2) called when SCTP_EVENT_NO_PENDING_TSN event is issued. | |
5517 | * | |
5518 | * For the case (2), the arg parameter is set to NULL. We need | |
5519 | * to check that we have a chunk before accessing it's fields. | |
5520 | */ | |
5521 | if (chunk) { | |
5522 | if (!sctp_vtag_verify(chunk, asoc)) | |
ac23e681 XL |
5523 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
5524 | commands); | |
1da177e4 LT |
5525 | |
5526 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 XL |
5527 | if (!sctp_chunk_length_valid( |
5528 | chunk, sizeof(struct sctp_shutdown_chunk))) | |
5529 | return sctp_sf_violation_chunklen(net, ep, asoc, type, | |
5530 | arg, commands); | |
1da177e4 LT |
5531 | } |
5532 | ||
5533 | /* If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5534 | * shall send a SHUTDOWN ACK ... | |
5535 | */ | |
5536 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
5537 | if (!reply) | |
5538 | goto nomem; | |
5539 | ||
5540 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
5541 | * the T2-shutdown timer. | |
5542 | */ | |
5543 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5544 | ||
5545 | /* and start/restart a T2-shutdown timer of its own, */ | |
5546 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5547 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5548 | ||
9f70f46b | 5549 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5550 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5551 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5552 | ||
5553 | /* Enter the SHUTDOWN-ACK-SENT state. */ | |
5554 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5555 | SCTP_STATE(SCTP_STATE_SHUTDOWN_ACK_SENT)); | |
5556 | ||
5557 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5558 | * | |
5559 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5560 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5561 | */ |
5562 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5563 | ||
5564 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5565 | ||
5566 | return SCTP_DISPOSITION_CONSUME; | |
5567 | ||
5568 | nomem: | |
5569 | return SCTP_DISPOSITION_NOMEM; | |
5570 | } | |
5571 | ||
5572 | /* | |
5573 | * Ignore the event defined as other | |
5574 | * | |
5575 | * The return value is the disposition of the event. | |
5576 | */ | |
172a1599 XL |
5577 | enum sctp_disposition sctp_sf_ignore_other(struct net *net, |
5578 | const struct sctp_endpoint *ep, | |
5579 | const struct sctp_association *asoc, | |
5580 | const union sctp_subtype type, | |
5581 | void *arg, | |
5582 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5583 | { |
bb33381d DB |
5584 | pr_debug("%s: the event other type:%d is ignored\n", |
5585 | __func__, type.other); | |
5586 | ||
1da177e4 LT |
5587 | return SCTP_DISPOSITION_DISCARD; |
5588 | } | |
5589 | ||
5590 | /************************************************************ | |
5591 | * These are the state functions for handling timeout events. | |
5592 | ************************************************************/ | |
5593 | ||
5594 | /* | |
5595 | * RTX Timeout | |
5596 | * | |
5597 | * Section: 6.3.3 Handle T3-rtx Expiration | |
5598 | * | |
5599 | * Whenever the retransmission timer T3-rtx expires for a destination | |
5600 | * address, do the following: | |
5601 | * [See below] | |
5602 | * | |
5603 | * The return value is the disposition of the chunk. | |
5604 | */ | |
172a1599 XL |
5605 | enum sctp_disposition sctp_sf_do_6_3_3_rtx(struct net *net, |
5606 | const struct sctp_endpoint *ep, | |
5607 | const struct sctp_association *asoc, | |
5608 | const union sctp_subtype type, | |
5609 | void *arg, | |
5610 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5611 | { |
5612 | struct sctp_transport *transport = arg; | |
5613 | ||
b01a2407 | 5614 | SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS); |
ac0b0462 | 5615 | |
1da177e4 | 5616 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8a0d19c5 | 5617 | if (asoc->peer.zero_window_announced && |
5618 | asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { | |
f8d96052 TG |
5619 | /* |
5620 | * We are here likely because the receiver had its rwnd | |
5621 | * closed for a while and we have not been able to | |
5622 | * transmit the locally queued data within the maximum | |
5623 | * retransmission attempts limit. Start the T5 | |
5624 | * shutdown guard timer to give the receiver one last | |
5625 | * chance and some additional time to recover before | |
5626 | * aborting. | |
5627 | */ | |
5628 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START_ONCE, | |
5629 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5630 | } else { | |
5631 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
5632 | SCTP_ERROR(ETIMEDOUT)); | |
5633 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
5634 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5635 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
b01a2407 EB |
5636 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5637 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
f8d96052 TG |
5638 | return SCTP_DISPOSITION_DELETE_TCB; |
5639 | } | |
1da177e4 LT |
5640 | } |
5641 | ||
5642 | /* E1) For the destination address for which the timer | |
5643 | * expires, adjust its ssthresh with rules defined in Section | |
5644 | * 7.2.3 and set the cwnd <- MTU. | |
5645 | */ | |
5646 | ||
5647 | /* E2) For the destination address for which the timer | |
5648 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
5649 | * maximum value discussed in rule C7 above (RTO.max) may be | |
5650 | * used to provide an upper bound to this doubling operation. | |
5651 | */ | |
5652 | ||
5653 | /* E3) Determine how many of the earliest (i.e., lowest TSN) | |
5654 | * outstanding DATA chunks for the address for which the | |
5655 | * T3-rtx has expired will fit into a single packet, subject | |
5656 | * to the MTU constraint for the path corresponding to the | |
5657 | * destination transport address to which the retransmission | |
5658 | * is being sent (this may be different from the address for | |
5659 | * which the timer expires [see Section 6.4]). Call this | |
5660 | * value K. Bundle and retransmit those K DATA chunks in a | |
5661 | * single packet to the destination endpoint. | |
5662 | * | |
5663 | * Note: Any DATA chunks that were sent to the address for | |
5664 | * which the T3-rtx timer expired but did not fit in one MTU | |
5665 | * (rule E3 above), should be marked for retransmission and | |
5666 | * sent as soon as cwnd allows (normally when a SACK arrives). | |
5667 | */ | |
5668 | ||
1da177e4 LT |
5669 | /* Do some failure management (Section 8.2). */ |
5670 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
5671 | ||
1845a579 VY |
5672 | /* NB: Rules E4 and F1 are implicit in R1. */ |
5673 | sctp_add_cmd_sf(commands, SCTP_CMD_RETRAN, SCTP_TRANSPORT(transport)); | |
5674 | ||
1da177e4 LT |
5675 | return SCTP_DISPOSITION_CONSUME; |
5676 | } | |
5677 | ||
5678 | /* | |
5679 | * Generate delayed SACK on timeout | |
5680 | * | |
5681 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
5682 | * | |
5683 | * The guidelines on delayed acknowledgement algorithm specified in | |
5684 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
5685 | * acknowledgement SHOULD be generated for at least every second packet | |
5686 | * (not every second DATA chunk) received, and SHOULD be generated | |
5687 | * within 200 ms of the arrival of any unacknowledged DATA chunk. In | |
5688 | * some situations it may be beneficial for an SCTP transmitter to be | |
5689 | * more conservative than the algorithms detailed in this document | |
5690 | * allow. However, an SCTP transmitter MUST NOT be more aggressive than | |
5691 | * the following algorithms allow. | |
5692 | */ | |
172a1599 XL |
5693 | enum sctp_disposition sctp_sf_do_6_2_sack(struct net *net, |
5694 | const struct sctp_endpoint *ep, | |
5695 | const struct sctp_association *asoc, | |
5696 | const union sctp_subtype type, | |
5697 | void *arg, | |
5698 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5699 | { |
b01a2407 | 5700 | SCTP_INC_STATS(net, SCTP_MIB_DELAY_SACK_EXPIREDS); |
1da177e4 LT |
5701 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); |
5702 | return SCTP_DISPOSITION_CONSUME; | |
5703 | } | |
5704 | ||
5705 | /* | |
3f7a87d2 | 5706 | * sctp_sf_t1_init_timer_expire |
1da177e4 LT |
5707 | * |
5708 | * Section: 4 Note: 2 | |
5709 | * Verification Tag: | |
5710 | * Inputs | |
5711 | * (endpoint, asoc) | |
5712 | * | |
5713 | * RFC 2960 Section 4 Notes | |
5714 | * 2) If the T1-init timer expires, the endpoint MUST retransmit INIT | |
5715 | * and re-start the T1-init timer without changing state. This MUST | |
5716 | * be repeated up to 'Max.Init.Retransmits' times. After that, the | |
5717 | * endpoint MUST abort the initialization process and report the | |
5718 | * error to SCTP user. | |
5719 | * | |
3f7a87d2 FF |
5720 | * Outputs |
5721 | * (timers, events) | |
5722 | * | |
5723 | */ | |
172a1599 XL |
5724 | enum sctp_disposition sctp_sf_t1_init_timer_expire( |
5725 | struct net *net, | |
5726 | const struct sctp_endpoint *ep, | |
5727 | const struct sctp_association *asoc, | |
5728 | const union sctp_subtype type, | |
5729 | void *arg, | |
5730 | struct sctp_cmd_seq *commands) | |
3f7a87d2 | 5731 | { |
172a1599 | 5732 | int attempts = asoc->init_err_counter + 1; |
3f7a87d2 FF |
5733 | struct sctp_chunk *repl = NULL; |
5734 | struct sctp_bind_addr *bp; | |
3f7a87d2 | 5735 | |
bb33381d DB |
5736 | pr_debug("%s: timer T1 expired (INIT)\n", __func__); |
5737 | ||
b01a2407 | 5738 | SCTP_INC_STATS(net, SCTP_MIB_T1_INIT_EXPIREDS); |
3f7a87d2 | 5739 | |
81845c21 | 5740 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 FF |
5741 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; |
5742 | repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0); | |
5743 | if (!repl) | |
5744 | return SCTP_DISPOSITION_NOMEM; | |
5745 | ||
5746 | /* Choose transport for INIT. */ | |
5747 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
5748 | SCTP_CHUNK(repl)); | |
5749 | ||
5750 | /* Issue a sideeffect to do the needed accounting. */ | |
5751 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART, | |
5752 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5753 | ||
5754 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
5755 | } else { | |
bb33381d DB |
5756 | pr_debug("%s: giving up on INIT, attempts:%d " |
5757 | "max_init_attempts:%d\n", __func__, attempts, | |
5758 | asoc->max_init_attempts); | |
5759 | ||
8de8c873 SS |
5760 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5761 | SCTP_ERROR(ETIMEDOUT)); | |
3f7a87d2 | 5762 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5763 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
3f7a87d2 FF |
5764 | return SCTP_DISPOSITION_DELETE_TCB; |
5765 | } | |
5766 | ||
5767 | return SCTP_DISPOSITION_CONSUME; | |
5768 | } | |
5769 | ||
5770 | /* | |
5771 | * sctp_sf_t1_cookie_timer_expire | |
5772 | * | |
5773 | * Section: 4 Note: 2 | |
5774 | * Verification Tag: | |
5775 | * Inputs | |
5776 | * (endpoint, asoc) | |
5777 | * | |
5778 | * RFC 2960 Section 4 Notes | |
5779 | * 3) If the T1-cookie timer expires, the endpoint MUST retransmit | |
1da177e4 LT |
5780 | * COOKIE ECHO and re-start the T1-cookie timer without changing |
5781 | * state. This MUST be repeated up to 'Max.Init.Retransmits' times. | |
5782 | * After that, the endpoint MUST abort the initialization process and | |
5783 | * report the error to SCTP user. | |
5784 | * | |
5785 | * Outputs | |
5786 | * (timers, events) | |
5787 | * | |
5788 | */ | |
172a1599 XL |
5789 | enum sctp_disposition sctp_sf_t1_cookie_timer_expire( |
5790 | struct net *net, | |
5791 | const struct sctp_endpoint *ep, | |
5792 | const struct sctp_association *asoc, | |
5793 | const union sctp_subtype type, | |
5794 | void *arg, | |
5795 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5796 | { |
3f7a87d2 | 5797 | int attempts = asoc->init_err_counter + 1; |
172a1599 | 5798 | struct sctp_chunk *repl = NULL; |
1da177e4 | 5799 | |
bb33381d DB |
5800 | pr_debug("%s: timer T1 expired (COOKIE-ECHO)\n", __func__); |
5801 | ||
b01a2407 | 5802 | SCTP_INC_STATS(net, SCTP_MIB_T1_COOKIE_EXPIREDS); |
1da177e4 | 5803 | |
81845c21 | 5804 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 | 5805 | repl = sctp_make_cookie_echo(asoc, NULL); |
1da177e4 | 5806 | if (!repl) |
3f7a87d2 | 5807 | return SCTP_DISPOSITION_NOMEM; |
1da177e4 | 5808 | |
96cd0d3d VY |
5809 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, |
5810 | SCTP_CHUNK(repl)); | |
1da177e4 | 5811 | /* Issue a sideeffect to do the needed accounting. */ |
3f7a87d2 FF |
5812 | sctp_add_cmd_sf(commands, SCTP_CMD_COOKIEECHO_RESTART, |
5813 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
5814 | ||
1da177e4 LT |
5815 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
5816 | } else { | |
8de8c873 SS |
5817 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5818 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5819 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5820 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 LT |
5821 | return SCTP_DISPOSITION_DELETE_TCB; |
5822 | } | |
5823 | ||
5824 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5825 | } |
5826 | ||
5827 | /* RFC2960 9.2 If the timer expires, the endpoint must re-send the SHUTDOWN | |
5828 | * with the updated last sequential TSN received from its peer. | |
5829 | * | |
5830 | * An endpoint should limit the number of retransmissions of the | |
5831 | * SHUTDOWN chunk to the protocol parameter 'Association.Max.Retrans'. | |
5832 | * If this threshold is exceeded the endpoint should destroy the TCB and | |
5833 | * MUST report the peer endpoint unreachable to the upper layer (and | |
5834 | * thus the association enters the CLOSED state). The reception of any | |
5835 | * packet from its peer (i.e. as the peer sends all of its queued DATA | |
5836 | * chunks) should clear the endpoint's retransmission count and restart | |
5837 | * the T2-Shutdown timer, giving its peer ample opportunity to transmit | |
5838 | * all of its queued DATA chunks that have not yet been sent. | |
5839 | */ | |
172a1599 XL |
5840 | enum sctp_disposition sctp_sf_t2_timer_expire( |
5841 | struct net *net, | |
5842 | const struct sctp_endpoint *ep, | |
5843 | const struct sctp_association *asoc, | |
5844 | const union sctp_subtype type, | |
5845 | void *arg, | |
5846 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5847 | { |
5848 | struct sctp_chunk *reply = NULL; | |
5849 | ||
bb33381d DB |
5850 | pr_debug("%s: timer T2 expired\n", __func__); |
5851 | ||
b01a2407 | 5852 | SCTP_INC_STATS(net, SCTP_MIB_T2_SHUTDOWN_EXPIREDS); |
ac0b0462 | 5853 | |
58fbbed4 NH |
5854 | ((struct sctp_association *)asoc)->shutdown_retries++; |
5855 | ||
1da177e4 | 5856 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
5857 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5858 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
5859 | /* Note: CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
5860 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 5861 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
5862 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5863 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
5864 | return SCTP_DISPOSITION_DELETE_TCB; |
5865 | } | |
5866 | ||
5867 | switch (asoc->state) { | |
5868 | case SCTP_STATE_SHUTDOWN_SENT: | |
5869 | reply = sctp_make_shutdown(asoc, NULL); | |
5870 | break; | |
5871 | ||
5872 | case SCTP_STATE_SHUTDOWN_ACK_SENT: | |
5873 | reply = sctp_make_shutdown_ack(asoc, NULL); | |
5874 | break; | |
5875 | ||
5876 | default: | |
5877 | BUG(); | |
5878 | break; | |
3ff50b79 | 5879 | } |
1da177e4 LT |
5880 | |
5881 | if (!reply) | |
5882 | goto nomem; | |
5883 | ||
6345b199 WY |
5884 | /* Do some failure management (Section 8.2). |
5885 | * If we remove the transport an SHUTDOWN was last sent to, don't | |
5886 | * do failure management. | |
5887 | */ | |
5888 | if (asoc->shutdown_last_sent_to) | |
5889 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
5890 | SCTP_TRANSPORT(asoc->shutdown_last_sent_to)); | |
1da177e4 LT |
5891 | |
5892 | /* Set the transport for the SHUTDOWN/ACK chunk and the timeout for | |
5893 | * the T2-shutdown timer. | |
5894 | */ | |
5895 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5896 | ||
5897 | /* Restart the T2-shutdown timer. */ | |
5898 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5899 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5900 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5901 | return SCTP_DISPOSITION_CONSUME; | |
5902 | ||
5903 | nomem: | |
5904 | return SCTP_DISPOSITION_NOMEM; | |
5905 | } | |
5906 | ||
5907 | /* | |
5908 | * ADDIP Section 4.1 ASCONF CHunk Procedures | |
5909 | * If the T4 RTO timer expires the endpoint should do B1 to B5 | |
5910 | */ | |
172a1599 XL |
5911 | enum sctp_disposition sctp_sf_t4_timer_expire( |
5912 | struct net *net, | |
5913 | const struct sctp_endpoint *ep, | |
5914 | const struct sctp_association *asoc, | |
5915 | const union sctp_subtype type, | |
5916 | void *arg, | |
5917 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5918 | { |
5919 | struct sctp_chunk *chunk = asoc->addip_last_asconf; | |
5920 | struct sctp_transport *transport = chunk->transport; | |
5921 | ||
b01a2407 | 5922 | SCTP_INC_STATS(net, SCTP_MIB_T4_RTO_EXPIREDS); |
ac0b0462 | 5923 | |
1da177e4 LT |
5924 | /* ADDIP 4.1 B1) Increment the error counters and perform path failure |
5925 | * detection on the appropriate destination address as defined in | |
5926 | * RFC2960 [5] section 8.1 and 8.2. | |
5927 | */ | |
10a43cea WY |
5928 | if (transport) |
5929 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
5930 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
5931 | |
5932 | /* Reconfig T4 timer and transport. */ | |
5933 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5934 | ||
5935 | /* ADDIP 4.1 B2) Increment the association error counters and perform | |
5936 | * endpoint failure detection on the association as defined in | |
5937 | * RFC2960 [5] section 8.1 and 8.2. | |
5938 | * association error counter is incremented in SCTP_CMD_STRIKE. | |
5939 | */ | |
5940 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
5941 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5942 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
8de8c873 SS |
5943 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5944 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5945 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 5946 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
5947 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5948 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
5949 | return SCTP_DISPOSITION_ABORT; |
5950 | } | |
5951 | ||
5952 | /* ADDIP 4.1 B3) Back-off the destination address RTO value to which | |
5953 | * the ASCONF chunk was sent by doubling the RTO timer value. | |
5954 | * This is done in SCTP_CMD_STRIKE. | |
5955 | */ | |
5956 | ||
5957 | /* ADDIP 4.1 B4) Re-transmit the ASCONF Chunk last sent and if possible | |
5958 | * choose an alternate destination address (please refer to RFC2960 | |
5959 | * [5] section 6.4.1). An endpoint MUST NOT add new parameters to this | |
d808ad9a | 5960 | * chunk, it MUST be the same (including its serial number) as the last |
1da177e4 LT |
5961 | * ASCONF sent. |
5962 | */ | |
5963 | sctp_chunk_hold(asoc->addip_last_asconf); | |
5964 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
5965 | SCTP_CHUNK(asoc->addip_last_asconf)); | |
5966 | ||
5967 | /* ADDIP 4.1 B5) Restart the T-4 RTO timer. Note that if a different | |
5968 | * destination is selected, then the RTO used will be that of the new | |
5969 | * destination address. | |
5970 | */ | |
5971 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5972 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5973 | ||
5974 | return SCTP_DISPOSITION_CONSUME; | |
5975 | } | |
5976 | ||
5977 | /* sctpimpguide-05 Section 2.12.2 | |
5978 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5979 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5980 | * At the expiration of this timer the sender SHOULD abort the association | |
5981 | * by sending an ABORT chunk. | |
5982 | */ | |
172a1599 XL |
5983 | enum sctp_disposition sctp_sf_t5_timer_expire( |
5984 | struct net *net, | |
5985 | const struct sctp_endpoint *ep, | |
5986 | const struct sctp_association *asoc, | |
5987 | const union sctp_subtype type, | |
5988 | void *arg, | |
5989 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5990 | { |
5991 | struct sctp_chunk *reply = NULL; | |
5992 | ||
bb33381d DB |
5993 | pr_debug("%s: timer T5 expired\n", __func__); |
5994 | ||
b01a2407 | 5995 | SCTP_INC_STATS(net, SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS); |
1da177e4 LT |
5996 | |
5997 | reply = sctp_make_abort(asoc, NULL, 0); | |
5998 | if (!reply) | |
5999 | goto nomem; | |
6000 | ||
6001 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
8de8c873 SS |
6002 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6003 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 6004 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6005 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 | 6006 | |
b01a2407 EB |
6007 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6008 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
a1080a8b | 6009 | |
1da177e4 LT |
6010 | return SCTP_DISPOSITION_DELETE_TCB; |
6011 | nomem: | |
6012 | return SCTP_DISPOSITION_NOMEM; | |
6013 | } | |
6014 | ||
6015 | /* Handle expiration of AUTOCLOSE timer. When the autoclose timer expires, | |
6016 | * the association is automatically closed by starting the shutdown process. | |
6017 | * The work that needs to be done is same as when SHUTDOWN is initiated by | |
6018 | * the user. So this routine looks same as sctp_sf_do_9_2_prm_shutdown(). | |
6019 | */ | |
172a1599 XL |
6020 | enum sctp_disposition sctp_sf_autoclose_timer_expire( |
6021 | struct net *net, | |
6022 | const struct sctp_endpoint *ep, | |
6023 | const struct sctp_association *asoc, | |
6024 | const union sctp_subtype type, | |
6025 | void *arg, | |
6026 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6027 | { |
172a1599 | 6028 | enum sctp_disposition disposition; |
1da177e4 | 6029 | |
b01a2407 | 6030 | SCTP_INC_STATS(net, SCTP_MIB_AUTOCLOSE_EXPIREDS); |
ac0b0462 | 6031 | |
1da177e4 LT |
6032 | /* From 9.2 Shutdown of an Association |
6033 | * Upon receipt of the SHUTDOWN primitive from its upper | |
6034 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
6035 | * remains there until all outstanding data has been | |
6036 | * acknowledged by its peer. The endpoint accepts no new data | |
6037 | * from its upper layer, but retransmits data to the far end | |
6038 | * if necessary to fill gaps. | |
6039 | */ | |
6040 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
6041 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
6042 | ||
1da177e4 LT |
6043 | disposition = SCTP_DISPOSITION_CONSUME; |
6044 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 6045 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
6046 | arg, commands); |
6047 | } | |
172a1599 | 6048 | |
1da177e4 LT |
6049 | return disposition; |
6050 | } | |
6051 | ||
6052 | /***************************************************************************** | |
6053 | * These are sa state functions which could apply to all types of events. | |
6054 | ****************************************************************************/ | |
6055 | ||
6056 | /* | |
6057 | * This table entry is not implemented. | |
6058 | * | |
6059 | * Inputs | |
6060 | * (endpoint, asoc, chunk) | |
6061 | * | |
6062 | * The return value is the disposition of the chunk. | |
6063 | */ | |
172a1599 XL |
6064 | enum sctp_disposition sctp_sf_not_impl(struct net *net, |
6065 | const struct sctp_endpoint *ep, | |
6066 | const struct sctp_association *asoc, | |
6067 | const union sctp_subtype type, | |
6068 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6069 | { |
6070 | return SCTP_DISPOSITION_NOT_IMPL; | |
6071 | } | |
6072 | ||
6073 | /* | |
6074 | * This table entry represents a bug. | |
6075 | * | |
6076 | * Inputs | |
6077 | * (endpoint, asoc, chunk) | |
6078 | * | |
6079 | * The return value is the disposition of the chunk. | |
6080 | */ | |
172a1599 XL |
6081 | enum sctp_disposition sctp_sf_bug(struct net *net, |
6082 | const struct sctp_endpoint *ep, | |
6083 | const struct sctp_association *asoc, | |
6084 | const union sctp_subtype type, | |
6085 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6086 | { |
6087 | return SCTP_DISPOSITION_BUG; | |
6088 | } | |
6089 | ||
6090 | /* | |
6091 | * This table entry represents the firing of a timer in the wrong state. | |
6092 | * Since timer deletion cannot be guaranteed a timer 'may' end up firing | |
6093 | * when the association is in the wrong state. This event should | |
6094 | * be ignored, so as to prevent any rearming of the timer. | |
6095 | * | |
6096 | * Inputs | |
6097 | * (endpoint, asoc, chunk) | |
6098 | * | |
6099 | * The return value is the disposition of the chunk. | |
6100 | */ | |
172a1599 XL |
6101 | enum sctp_disposition sctp_sf_timer_ignore(struct net *net, |
6102 | const struct sctp_endpoint *ep, | |
6103 | const struct sctp_association *asoc, | |
6104 | const union sctp_subtype type, | |
6105 | void *arg, | |
6106 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6107 | { |
bb33381d DB |
6108 | pr_debug("%s: timer %d ignored\n", __func__, type.chunk); |
6109 | ||
1da177e4 LT |
6110 | return SCTP_DISPOSITION_CONSUME; |
6111 | } | |
6112 | ||
6113 | /******************************************************************** | |
6114 | * 2nd Level Abstractions | |
6115 | ********************************************************************/ | |
6116 | ||
6117 | /* Pull the SACK chunk based on the SACK header. */ | |
6118 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk) | |
6119 | { | |
6120 | struct sctp_sackhdr *sack; | |
172a1599 | 6121 | __u16 num_dup_tsns; |
1da177e4 LT |
6122 | unsigned int len; |
6123 | __u16 num_blocks; | |
1da177e4 LT |
6124 | |
6125 | /* Protect ourselves from reading too far into | |
6126 | * the skb from a bogus sender. | |
6127 | */ | |
6128 | sack = (struct sctp_sackhdr *) chunk->skb->data; | |
6129 | ||
6130 | num_blocks = ntohs(sack->num_gap_ack_blocks); | |
6131 | num_dup_tsns = ntohs(sack->num_dup_tsns); | |
6132 | len = sizeof(struct sctp_sackhdr); | |
6133 | len += (num_blocks + num_dup_tsns) * sizeof(__u32); | |
6134 | if (len > chunk->skb->len) | |
6135 | return NULL; | |
6136 | ||
6137 | skb_pull(chunk->skb, len); | |
6138 | ||
6139 | return sack; | |
6140 | } | |
6141 | ||
6142 | /* Create an ABORT packet to be sent as a response, with the specified | |
6143 | * error causes. | |
6144 | */ | |
172a1599 XL |
6145 | static struct sctp_packet *sctp_abort_pkt_new( |
6146 | struct net *net, | |
6147 | const struct sctp_endpoint *ep, | |
6148 | const struct sctp_association *asoc, | |
6149 | struct sctp_chunk *chunk, | |
6150 | const void *payload, size_t paylen) | |
1da177e4 LT |
6151 | { |
6152 | struct sctp_packet *packet; | |
6153 | struct sctp_chunk *abort; | |
6154 | ||
2ce95503 | 6155 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6156 | |
6157 | if (packet) { | |
6158 | /* Make an ABORT. | |
6159 | * The T bit will be set if the asoc is NULL. | |
6160 | */ | |
6161 | abort = sctp_make_abort(asoc, chunk, paylen); | |
6162 | if (!abort) { | |
6163 | sctp_ootb_pkt_free(packet); | |
6164 | return NULL; | |
6165 | } | |
047a2428 JF |
6166 | |
6167 | /* Reflect vtag if T-Bit is set */ | |
6168 | if (sctp_test_T_bit(abort)) | |
6169 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
6170 | ||
1da177e4 LT |
6171 | /* Add specified error causes, i.e., payload, to the |
6172 | * end of the chunk. | |
6173 | */ | |
6174 | sctp_addto_chunk(abort, paylen, payload); | |
6175 | ||
6176 | /* Set the skb to the belonging sock for accounting. */ | |
6177 | abort->skb->sk = ep->base.sk; | |
6178 | ||
6179 | sctp_packet_append_chunk(packet, abort); | |
6180 | ||
6181 | } | |
6182 | ||
6183 | return packet; | |
6184 | } | |
6185 | ||
6186 | /* Allocate a packet for responding in the OOTB conditions. */ | |
172a1599 XL |
6187 | static struct sctp_packet *sctp_ootb_pkt_new( |
6188 | struct net *net, | |
6189 | const struct sctp_association *asoc, | |
6190 | const struct sctp_chunk *chunk) | |
1da177e4 | 6191 | { |
1da177e4 | 6192 | struct sctp_transport *transport; |
172a1599 XL |
6193 | struct sctp_packet *packet; |
6194 | __u16 sport, dport; | |
1da177e4 LT |
6195 | __u32 vtag; |
6196 | ||
6197 | /* Get the source and destination port from the inbound packet. */ | |
6198 | sport = ntohs(chunk->sctp_hdr->dest); | |
6199 | dport = ntohs(chunk->sctp_hdr->source); | |
6200 | ||
6201 | /* The V-tag is going to be the same as the inbound packet if no | |
6202 | * association exists, otherwise, use the peer's vtag. | |
6203 | */ | |
6204 | if (asoc) { | |
02c4e12c WY |
6205 | /* Special case the INIT-ACK as there is no peer's vtag |
6206 | * yet. | |
6207 | */ | |
cb3f837b | 6208 | switch (chunk->chunk_hdr->type) { |
02c4e12c WY |
6209 | case SCTP_CID_INIT_ACK: |
6210 | { | |
cb1844c4 | 6211 | struct sctp_initack_chunk *initack; |
02c4e12c | 6212 | |
cb1844c4 | 6213 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
02c4e12c WY |
6214 | vtag = ntohl(initack->init_hdr.init_tag); |
6215 | break; | |
6216 | } | |
6217 | default: | |
6218 | vtag = asoc->peer.i.init_tag; | |
6219 | break; | |
6220 | } | |
1da177e4 LT |
6221 | } else { |
6222 | /* Special case the INIT and stale COOKIE_ECHO as there is no | |
6223 | * vtag yet. | |
6224 | */ | |
cb3f837b | 6225 | switch (chunk->chunk_hdr->type) { |
1da177e4 LT |
6226 | case SCTP_CID_INIT: |
6227 | { | |
01a992be | 6228 | struct sctp_init_chunk *init; |
1da177e4 | 6229 | |
01a992be | 6230 | init = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
6231 | vtag = ntohl(init->init_hdr.init_tag); |
6232 | break; | |
6233 | } | |
d808ad9a | 6234 | default: |
1da177e4 LT |
6235 | vtag = ntohl(chunk->sctp_hdr->vtag); |
6236 | break; | |
6237 | } | |
6238 | } | |
6239 | ||
6240 | /* Make a transport for the bucket, Eliza... */ | |
89bf3450 | 6241 | transport = sctp_transport_new(net, sctp_source(chunk), GFP_ATOMIC); |
1da177e4 LT |
6242 | if (!transport) |
6243 | goto nomem; | |
6244 | ||
6245 | /* Cache a route for the transport with the chunk's destination as | |
6246 | * the source address. | |
6247 | */ | |
16b0a030 | 6248 | sctp_transport_route(transport, (union sctp_addr *)&chunk->dest, |
2ce95503 | 6249 | sctp_sk(net->sctp.ctl_sock)); |
1da177e4 | 6250 | |
66b91d2c MRL |
6251 | packet = &transport->packet; |
6252 | sctp_packet_init(packet, transport, sport, dport); | |
6253 | sctp_packet_config(packet, vtag, 0); | |
1da177e4 LT |
6254 | |
6255 | return packet; | |
6256 | ||
6257 | nomem: | |
6258 | return NULL; | |
6259 | } | |
6260 | ||
6261 | /* Free the packet allocated earlier for responding in the OOTB condition. */ | |
6262 | void sctp_ootb_pkt_free(struct sctp_packet *packet) | |
6263 | { | |
6264 | sctp_transport_free(packet->transport); | |
6265 | } | |
6266 | ||
6267 | /* Send a stale cookie error when a invalid COOKIE ECHO chunk is found */ | |
24cb81a6 EB |
6268 | static void sctp_send_stale_cookie_err(struct net *net, |
6269 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
6270 | const struct sctp_association *asoc, |
6271 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 6272 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
6273 | struct sctp_chunk *err_chunk) |
6274 | { | |
6275 | struct sctp_packet *packet; | |
6276 | ||
6277 | if (err_chunk) { | |
2ce95503 | 6278 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6279 | if (packet) { |
6280 | struct sctp_signed_cookie *cookie; | |
6281 | ||
6282 | /* Override the OOTB vtag from the cookie. */ | |
6283 | cookie = chunk->subh.cookie_hdr; | |
6284 | packet->vtag = cookie->c.peer_vtag; | |
d808ad9a | 6285 | |
1da177e4 LT |
6286 | /* Set the skb to the belonging sock for accounting. */ |
6287 | err_chunk->skb->sk = ep->base.sk; | |
6288 | sctp_packet_append_chunk(packet, err_chunk); | |
6289 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
6290 | SCTP_PACKET(packet)); | |
b01a2407 | 6291 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
6292 | } else |
6293 | sctp_chunk_free (err_chunk); | |
6294 | } | |
6295 | } | |
6296 | ||
6297 | ||
6298 | /* Process a data chunk */ | |
6299 | static int sctp_eat_data(const struct sctp_association *asoc, | |
6300 | struct sctp_chunk *chunk, | |
a85bbeb2 | 6301 | struct sctp_cmd_seq *commands) |
1da177e4 | 6302 | { |
7c3ceb4f | 6303 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
049b3ff5 | 6304 | struct sock *sk = asoc->base.sk; |
24cb81a6 | 6305 | struct net *net = sock_net(sk); |
172a1599 XL |
6306 | struct sctp_datahdr *data_hdr; |
6307 | struct sctp_chunk *err; | |
6308 | enum sctp_verb deliver; | |
6309 | size_t datalen; | |
172a1599 XL |
6310 | __u32 tsn; |
6311 | int tmp; | |
1da177e4 | 6312 | |
3583df1a XL |
6313 | data_hdr = (struct sctp_datahdr *)chunk->skb->data; |
6314 | chunk->subh.data_hdr = data_hdr; | |
9d4ceaf1 | 6315 | skb_pull(chunk->skb, sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
6316 | |
6317 | tsn = ntohl(data_hdr->tsn); | |
bb33381d | 6318 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
6319 | |
6320 | /* ASSERT: Now skb->data is really the user data. */ | |
6321 | ||
6322 | /* Process ECN based congestion. | |
6323 | * | |
6324 | * Since the chunk structure is reused for all chunks within | |
6325 | * a packet, we use ecn_ce_done to track if we've already | |
6326 | * done CE processing for this packet. | |
6327 | * | |
6328 | * We need to do ECN processing even if we plan to discard the | |
6329 | * chunk later. | |
6330 | */ | |
6331 | ||
2d47fd12 | 6332 | if (asoc->peer.ecn_capable && !chunk->ecn_ce_done) { |
e7487c86 | 6333 | struct sctp_af *af = SCTP_INPUT_CB(chunk->skb)->af; |
1da177e4 LT |
6334 | chunk->ecn_ce_done = 1; |
6335 | ||
2d47fd12 | 6336 | if (af->is_ce(sctp_gso_headskb(chunk->skb))) { |
1da177e4 LT |
6337 | /* Do real work as sideffect. */ |
6338 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_CE, | |
6339 | SCTP_U32(tsn)); | |
6340 | } | |
6341 | } | |
6342 | ||
6343 | tmp = sctp_tsnmap_check(&asoc->peer.tsn_map, tsn); | |
6344 | if (tmp < 0) { | |
6345 | /* The TSN is too high--silently discard the chunk and | |
6346 | * count on it getting retransmitted later. | |
6347 | */ | |
196d6759 MB |
6348 | if (chunk->asoc) |
6349 | chunk->asoc->stats.outofseqtsns++; | |
1da177e4 LT |
6350 | return SCTP_IERROR_HIGH_TSN; |
6351 | } else if (tmp > 0) { | |
6352 | /* This is a duplicate. Record it. */ | |
6353 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_DUP, SCTP_U32(tsn)); | |
6354 | return SCTP_IERROR_DUP_TSN; | |
6355 | } | |
6356 | ||
6357 | /* This is a new TSN. */ | |
6358 | ||
6359 | /* Discard if there is no room in the receive window. | |
6360 | * Actually, allow a little bit of overflow (up to a MTU). | |
6361 | */ | |
6362 | datalen = ntohs(chunk->chunk_hdr->length); | |
9d4ceaf1 | 6363 | datalen -= sctp_datachk_len(&asoc->stream); |
1da177e4 LT |
6364 | |
6365 | deliver = SCTP_CMD_CHUNK_ULP; | |
6366 | ||
6367 | /* Think about partial delivery. */ | |
6368 | if ((datalen >= asoc->rwnd) && (!asoc->ulpq.pd_mode)) { | |
6369 | ||
6370 | /* Even if we don't accept this chunk there is | |
6371 | * memory pressure. | |
6372 | */ | |
6373 | sctp_add_cmd_sf(commands, SCTP_CMD_PART_DELIVER, SCTP_NULL()); | |
6374 | } | |
6375 | ||
d808ad9a | 6376 | /* Spill over rwnd a little bit. Note: While allowed, this spill over |
1da177e4 LT |
6377 | * seems a bit troublesome in that frag_point varies based on |
6378 | * PMTU. In cases, such as loopback, this might be a rather | |
6379 | * large spill over. | |
4d93df0a | 6380 | */ |
362d5204 | 6381 | if ((!chunk->data_accepted) && (!asoc->rwnd || asoc->rwnd_over || |
4d93df0a | 6382 | (datalen > asoc->rwnd + asoc->frag_point))) { |
1da177e4 LT |
6383 | |
6384 | /* If this is the next TSN, consider reneging to make | |
6385 | * room. Note: Playing nice with a confused sender. A | |
6386 | * malicious sender can still eat up all our buffer | |
6387 | * space and in the future we may want to detect and | |
6388 | * do more drastic reneging. | |
6389 | */ | |
7c3ceb4f NH |
6390 | if (sctp_tsnmap_has_gap(map) && |
6391 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { | |
bb33381d | 6392 | pr_debug("%s: reneging for tsn:%u\n", __func__, tsn); |
1da177e4 LT |
6393 | deliver = SCTP_CMD_RENEGE; |
6394 | } else { | |
bb33381d DB |
6395 | pr_debug("%s: discard tsn:%u len:%zu, rwnd:%d\n", |
6396 | __func__, tsn, datalen, asoc->rwnd); | |
6397 | ||
1da177e4 LT |
6398 | return SCTP_IERROR_IGNORE_TSN; |
6399 | } | |
6400 | } | |
6401 | ||
4d93df0a NH |
6402 | /* |
6403 | * Also try to renege to limit our memory usage in the event that | |
6404 | * we are under memory pressure | |
3ab224be | 6405 | * If we can't renege, don't worry about it, the sk_rmem_schedule |
4d93df0a NH |
6406 | * in sctp_ulpevent_make_rcvmsg will drop the frame if we grow our |
6407 | * memory usage too much | |
6408 | */ | |
6409 | if (*sk->sk_prot_creator->memory_pressure) { | |
6410 | if (sctp_tsnmap_has_gap(map) && | |
f7010e61 | 6411 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { |
bb33381d DB |
6412 | pr_debug("%s: under pressure, reneging for tsn:%u\n", |
6413 | __func__, tsn); | |
4d93df0a NH |
6414 | deliver = SCTP_CMD_RENEGE; |
6415 | } | |
6416 | } | |
6417 | ||
1da177e4 LT |
6418 | /* |
6419 | * Section 3.3.10.9 No User Data (9) | |
6420 | * | |
6421 | * Cause of error | |
6422 | * --------------- | |
6423 | * No User Data: This error cause is returned to the originator of a | |
6424 | * DATA chunk if a received DATA chunk has no user data. | |
6425 | */ | |
6426 | if (unlikely(0 == datalen)) { | |
6427 | err = sctp_make_abort_no_data(asoc, chunk, tsn); | |
6428 | if (err) { | |
6429 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6430 | SCTP_CHUNK(err)); | |
6431 | } | |
6432 | /* We are going to ABORT, so we might as well stop | |
6433 | * processing the rest of the chunks in the packet. | |
6434 | */ | |
cb3f837b | 6435 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 SS |
6436 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6437 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 | 6438 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6439 | SCTP_PERR(SCTP_ERROR_NO_DATA)); |
b01a2407 EB |
6440 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6441 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
6442 | return SCTP_IERROR_NO_DATA; |
6443 | } | |
6444 | ||
9faa730f SS |
6445 | chunk->data_accepted = 1; |
6446 | ||
1da177e4 LT |
6447 | /* Note: Some chunks may get overcounted (if we drop) or overcounted |
6448 | * if we renege and the chunk arrives again. | |
6449 | */ | |
196d6759 | 6450 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
b01a2407 | 6451 | SCTP_INC_STATS(net, SCTP_MIB_INUNORDERCHUNKS); |
196d6759 MB |
6452 | if (chunk->asoc) |
6453 | chunk->asoc->stats.iuodchunks++; | |
6454 | } else { | |
b01a2407 | 6455 | SCTP_INC_STATS(net, SCTP_MIB_INORDERCHUNKS); |
196d6759 MB |
6456 | if (chunk->asoc) |
6457 | chunk->asoc->stats.iodchunks++; | |
f1751c57 | 6458 | } |
1da177e4 LT |
6459 | |
6460 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
6461 | * | |
6462 | * If an endpoint receive a DATA chunk with an invalid stream | |
6463 | * identifier, it shall acknowledge the reception of the DATA chunk | |
6464 | * following the normal procedure, immediately send an ERROR chunk | |
6465 | * with cause set to "Invalid Stream Identifier" (See Section 3.3.10) | |
6466 | * and discard the DATA chunk. | |
6467 | */ | |
9d4ceaf1 | 6468 | if (ntohs(data_hdr->stream) >= asoc->stream.incnt) { |
3888e9ef VY |
6469 | /* Mark tsn as received even though we drop it */ |
6470 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_TSN, SCTP_U32(tsn)); | |
6471 | ||
1da177e4 LT |
6472 | err = sctp_make_op_error(asoc, chunk, SCTP_ERROR_INV_STRM, |
6473 | &data_hdr->stream, | |
6383cfb3 VY |
6474 | sizeof(data_hdr->stream), |
6475 | sizeof(u16)); | |
1da177e4 LT |
6476 | if (err) |
6477 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6478 | SCTP_CHUNK(err)); | |
6479 | return SCTP_IERROR_BAD_STREAM; | |
6480 | } | |
6481 | ||
f1751c57 VY |
6482 | /* Check to see if the SSN is possible for this TSN. |
6483 | * The biggest gap we can record is 4K wide. Since SSNs wrap | |
6484 | * at an unsigned short, there is no way that an SSN can | |
6485 | * wrap and for a valid TSN. We can simply check if the current | |
6486 | * SSN is smaller then the next expected one. If it is, it wrapped | |
6487 | * and is invalid. | |
6488 | */ | |
9d4ceaf1 | 6489 | if (!asoc->stream.si->validate_data(chunk)) |
f1751c57 | 6490 | return SCTP_IERROR_PROTO_VIOLATION; |
f1751c57 | 6491 | |
1da177e4 LT |
6492 | /* Send the data up to the user. Note: Schedule the |
6493 | * SCTP_CMD_CHUNK_ULP cmd before the SCTP_CMD_GEN_SACK, as the SACK | |
6494 | * chunk needs the updated rwnd. | |
6495 | */ | |
6496 | sctp_add_cmd_sf(commands, deliver, SCTP_CHUNK(chunk)); | |
6497 | ||
6498 | return SCTP_IERROR_NO_ERROR; | |
6499 | } |