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 | ||
172a1599 XL |
62 | static struct sctp_packet *sctp_abort_pkt_new( |
63 | struct net *net, | |
64 | const struct sctp_endpoint *ep, | |
65 | const struct sctp_association *asoc, | |
66 | struct sctp_chunk *chunk, | |
67 | const void *payload, size_t paylen); | |
1da177e4 LT |
68 | static int sctp_eat_data(const struct sctp_association *asoc, |
69 | struct sctp_chunk *chunk, | |
a85bbeb2 | 70 | struct sctp_cmd_seq *commands); |
172a1599 XL |
71 | static struct sctp_packet *sctp_ootb_pkt_new( |
72 | struct net *net, | |
73 | const struct sctp_association *asoc, | |
74 | const struct sctp_chunk *chunk); | |
24cb81a6 EB |
75 | static void sctp_send_stale_cookie_err(struct net *net, |
76 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
77 | const struct sctp_association *asoc, |
78 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 79 | struct sctp_cmd_seq *commands, |
1da177e4 | 80 | struct sctp_chunk *err_chunk); |
172a1599 XL |
81 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
82 | struct net *net, | |
83 | const struct sctp_endpoint *ep, | |
84 | const struct sctp_association *asoc, | |
85 | const union sctp_subtype type, | |
86 | void *arg, | |
87 | struct sctp_cmd_seq *commands); | |
88 | static enum sctp_disposition sctp_sf_shut_8_4_5( | |
89 | struct net *net, | |
90 | const struct sctp_endpoint *ep, | |
91 | const struct sctp_association *asoc, | |
92 | const union sctp_subtype type, | |
93 | void *arg, | |
94 | struct sctp_cmd_seq *commands); | |
95 | static enum sctp_disposition sctp_sf_tabort_8_4_8( | |
96 | struct net *net, | |
24cb81a6 | 97 | const struct sctp_endpoint *ep, |
ece25dfa | 98 | const struct sctp_association *asoc, |
bfc6f827 | 99 | const union sctp_subtype type, |
ece25dfa | 100 | void *arg, |
a85bbeb2 | 101 | struct sctp_cmd_seq *commands); |
1da177e4 LT |
102 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk); |
103 | ||
172a1599 XL |
104 | static enum sctp_disposition sctp_stop_t1_and_abort( |
105 | struct net *net, | |
106 | struct sctp_cmd_seq *commands, | |
107 | __be16 error, int sk_err, | |
108 | const struct sctp_association *asoc, | |
109 | struct sctp_transport *transport); | |
52c1da39 | 110 | |
172a1599 XL |
111 | static enum sctp_disposition sctp_sf_abort_violation( |
112 | struct net *net, | |
113 | const struct sctp_endpoint *ep, | |
114 | const struct sctp_association *asoc, | |
115 | void *arg, | |
116 | struct sctp_cmd_seq *commands, | |
117 | const __u8 *payload, | |
118 | const size_t paylen); | |
aecedeab | 119 | |
172a1599 XL |
120 | static enum sctp_disposition sctp_sf_violation_chunklen( |
121 | struct net *net, | |
122 | const struct sctp_endpoint *ep, | |
123 | const struct sctp_association *asoc, | |
124 | const union sctp_subtype type, | |
125 | void *arg, | |
126 | struct sctp_cmd_seq *commands); | |
1da177e4 | 127 | |
172a1599 XL |
128 | static enum sctp_disposition sctp_sf_violation_paramlen( |
129 | struct net *net, | |
130 | const struct sctp_endpoint *ep, | |
131 | const struct sctp_association *asoc, | |
132 | const union sctp_subtype type, | |
133 | void *arg, void *ext, | |
134 | struct sctp_cmd_seq *commands); | |
6f4c618d | 135 | |
172a1599 XL |
136 | static enum sctp_disposition sctp_sf_violation_ctsn( |
137 | struct net *net, | |
138 | const struct sctp_endpoint *ep, | |
139 | const struct sctp_association *asoc, | |
140 | const union sctp_subtype type, | |
141 | void *arg, | |
142 | struct sctp_cmd_seq *commands); | |
aecedeab | 143 | |
172a1599 XL |
144 | static enum sctp_disposition sctp_sf_violation_chunk( |
145 | struct net *net, | |
146 | const struct sctp_endpoint *ep, | |
147 | const struct sctp_association *asoc, | |
148 | const union sctp_subtype type, | |
149 | void *arg, | |
150 | struct sctp_cmd_seq *commands); | |
ece25dfa | 151 | |
4785c7ae | 152 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 XL |
153 | struct net *net, |
154 | const struct sctp_endpoint *ep, | |
155 | const struct sctp_association *asoc, | |
156 | const union sctp_subtype type, | |
157 | struct sctp_chunk *chunk); | |
bbd0d598 | 158 | |
172a1599 XL |
159 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
160 | struct net *net, | |
24cb81a6 | 161 | const struct sctp_endpoint *ep, |
75205f47 | 162 | const struct sctp_association *asoc, |
bfc6f827 | 163 | const union sctp_subtype type, |
75205f47 | 164 | void *arg, |
a85bbeb2 | 165 | struct sctp_cmd_seq *commands); |
75205f47 | 166 | |
1da177e4 LT |
167 | /* Small helper function that checks if the chunk length |
168 | * is of the appropriate length. The 'required_length' argument | |
169 | * is set to be the size of a specific chunk we are testing. | |
509e7a31 MRL |
170 | * Return Values: true = Valid length |
171 | * false = Invalid length | |
1da177e4 LT |
172 | * |
173 | */ | |
172a1599 XL |
174 | static inline bool sctp_chunk_length_valid(struct sctp_chunk *chunk, |
175 | __u16 required_length) | |
1da177e4 LT |
176 | { |
177 | __u16 chunk_length = ntohs(chunk->chunk_hdr->length); | |
178 | ||
26b87c78 DB |
179 | /* Previously already marked? */ |
180 | if (unlikely(chunk->pdiscard)) | |
509e7a31 | 181 | return false; |
1da177e4 | 182 | if (unlikely(chunk_length < required_length)) |
509e7a31 | 183 | return false; |
1da177e4 | 184 | |
509e7a31 | 185 | return true; |
1da177e4 LT |
186 | } |
187 | ||
188 | /********************************************************** | |
189 | * These are the state functions for handling chunk events. | |
190 | **********************************************************/ | |
191 | ||
192 | /* | |
193 | * Process the final SHUTDOWN COMPLETE. | |
194 | * | |
195 | * Section: 4 (C) (diagram), 9.2 | |
196 | * Upon reception of the SHUTDOWN COMPLETE chunk the endpoint will verify | |
197 | * that it is in SHUTDOWN-ACK-SENT state, if it is not the chunk should be | |
198 | * discarded. If the endpoint is in the SHUTDOWN-ACK-SENT state the endpoint | |
199 | * should stop the T2-shutdown timer and remove all knowledge of the | |
200 | * association (and thus the association enters the CLOSED state). | |
201 | * | |
047a2428 | 202 | * Verification Tag: 8.5.1(C), sctpimpguide 2.41. |
1da177e4 LT |
203 | * C) Rules for packet carrying SHUTDOWN COMPLETE: |
204 | * ... | |
047a2428 JF |
205 | * - The receiver of a SHUTDOWN COMPLETE shall accept the packet |
206 | * if the Verification Tag field of the packet matches its own tag and | |
207 | * the T bit is not set | |
208 | * OR | |
209 | * it is set to its peer's tag and the T bit is set in the Chunk | |
210 | * Flags. | |
211 | * Otherwise, the receiver MUST silently discard the packet | |
212 | * and take no further action. An endpoint MUST ignore the | |
213 | * SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state. | |
1da177e4 LT |
214 | * |
215 | * Inputs | |
216 | * (endpoint, asoc, chunk) | |
217 | * | |
218 | * Outputs | |
219 | * (asoc, reply_msg, msg_up, timers, counters) | |
220 | * | |
221 | * The return value is the disposition of the chunk. | |
222 | */ | |
172a1599 XL |
223 | enum sctp_disposition sctp_sf_do_4_C(struct net *net, |
224 | const struct sctp_endpoint *ep, | |
225 | const struct sctp_association *asoc, | |
226 | const union sctp_subtype type, | |
227 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
228 | { |
229 | struct sctp_chunk *chunk = arg; | |
230 | struct sctp_ulpevent *ev; | |
231 | ||
ece25dfa | 232 | if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6 | 233 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
ece25dfa | 234 | |
1da177e4 LT |
235 | /* RFC 2960 6.10 Bundling |
236 | * | |
237 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
238 | * SHUTDOWN COMPLETE with any other chunks. | |
239 | */ | |
240 | if (!chunk->singleton) | |
24cb81a6 | 241 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 242 | |
ece25dfa | 243 | /* Make sure that the SHUTDOWN_COMPLETE chunk has a valid length. */ |
922dbc5b | 244 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 245 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 246 | commands); |
1da177e4 LT |
247 | |
248 | /* RFC 2960 10.2 SCTP-to-ULP | |
249 | * | |
250 | * H) SHUTDOWN COMPLETE notification | |
251 | * | |
252 | * When SCTP completes the shutdown procedures (section 9.2) this | |
253 | * notification is passed to the upper layer. | |
254 | */ | |
255 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 256 | 0, 0, 0, NULL, GFP_ATOMIC); |
df7deeb5 VY |
257 | if (ev) |
258 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
d808ad9a | 259 | SCTP_ULPEVENT(ev)); |
1da177e4 LT |
260 | |
261 | /* Upon reception of the SHUTDOWN COMPLETE chunk the endpoint | |
262 | * will verify that it is in SHUTDOWN-ACK-SENT state, if it is | |
263 | * not the chunk should be discarded. If the endpoint is in | |
264 | * the SHUTDOWN-ACK-SENT state the endpoint should stop the | |
265 | * T2-shutdown timer and remove all knowledge of the | |
266 | * association (and thus the association enters the CLOSED | |
267 | * state). | |
268 | */ | |
269 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
270 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
271 | ||
272 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
273 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
274 | ||
275 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
276 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
277 | ||
b01a2407 EB |
278 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
279 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
280 | |
281 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
282 | ||
283 | return SCTP_DISPOSITION_DELETE_TCB; | |
1da177e4 LT |
284 | } |
285 | ||
286 | /* | |
287 | * Respond to a normal INIT chunk. | |
288 | * We are the side that is being asked for an association. | |
289 | * | |
290 | * Section: 5.1 Normal Establishment of an Association, B | |
291 | * B) "Z" shall respond immediately with an INIT ACK chunk. The | |
292 | * destination IP address of the INIT ACK MUST be set to the source | |
293 | * IP address of the INIT to which this INIT ACK is responding. In | |
294 | * the response, besides filling in other parameters, "Z" must set the | |
295 | * Verification Tag field to Tag_A, and also provide its own | |
296 | * Verification Tag (Tag_Z) in the Initiate Tag field. | |
297 | * | |
d808ad9a | 298 | * Verification Tag: Must be 0. |
1da177e4 LT |
299 | * |
300 | * Inputs | |
301 | * (endpoint, asoc, chunk) | |
302 | * | |
303 | * Outputs | |
304 | * (asoc, reply_msg, msg_up, timers, counters) | |
305 | * | |
306 | * The return value is the disposition of the chunk. | |
307 | */ | |
172a1599 XL |
308 | enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net, |
309 | const struct sctp_endpoint *ep, | |
310 | const struct sctp_association *asoc, | |
311 | const union sctp_subtype type, | |
312 | void *arg, | |
313 | struct sctp_cmd_seq *commands) | |
1da177e4 | 314 | { |
62e6b7e4 XL |
315 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
316 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 317 | struct sctp_association *new_asoc; |
1da177e4 | 318 | struct sctp_packet *packet; |
1da177e4 LT |
319 | int len; |
320 | ||
321 | /* 6.10 Bundling | |
322 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
323 | * SHUTDOWN COMPLETE with any other chunks. | |
d808ad9a | 324 | * |
1da177e4 LT |
325 | * IG Section 2.11.2 |
326 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
327 | * enforce these rules by silently discarding an arriving packet | |
328 | * with an INIT chunk that is bundled with other chunks. | |
329 | */ | |
330 | if (!chunk->singleton) | |
24cb81a6 | 331 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
332 | |
333 | /* If the packet is an OOTB packet which is temporarily on the | |
334 | * control endpoint, respond with an ABORT. | |
335 | */ | |
2ce95503 | 336 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 337 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 338 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 339 | } |
1da177e4 | 340 | |
1da177e4 | 341 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification |
d808ad9a | 342 | * Tag. |
1da177e4 LT |
343 | */ |
344 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 345 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
346 | |
347 | /* Make sure that the INIT chunk has a valid length. | |
348 | * Normally, this would cause an ABORT with a Protocol Violation | |
349 | * error, but since we don't have an association, we'll | |
350 | * just discard the packet. | |
351 | */ | |
01a992be | 352 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 353 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 354 | |
bec9640b VY |
355 | /* If the INIT is coming toward a closing socket, we'll send back |
356 | * and ABORT. Essentially, this catches the race of INIT being | |
357 | * backloged to the socket at the same time as the user isses close(). | |
358 | * Since the socket and all its associations are going away, we | |
359 | * can treat this OOTB | |
360 | */ | |
361 | if (sctp_sstate(ep->base.sk, CLOSING)) | |
24cb81a6 | 362 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
bec9640b | 363 | |
1da177e4 LT |
364 | /* Verify the INIT chunk before processing it. */ |
365 | err_chunk = NULL; | |
b14878cc | 366 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 367 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
368 | &err_chunk)) { |
369 | /* This chunk contains fatal error. It is to be discarded. | |
370 | * Send an ABORT, with causes if there is any. | |
371 | */ | |
372 | if (err_chunk) { | |
24cb81a6 | 373 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 374 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 375 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 376 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 377 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
378 | |
379 | sctp_chunk_free(err_chunk); | |
380 | ||
381 | if (packet) { | |
382 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
383 | SCTP_PACKET(packet)); | |
b01a2407 | 384 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
385 | return SCTP_DISPOSITION_CONSUME; |
386 | } else { | |
387 | return SCTP_DISPOSITION_NOMEM; | |
388 | } | |
389 | } else { | |
24cb81a6 | 390 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
391 | commands); |
392 | } | |
393 | } | |
394 | ||
d808ad9a | 395 | /* Grab the INIT header. */ |
4ae70c08 | 396 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
397 | |
398 | /* Tag the variable length parameters. */ | |
4ae70c08 | 399 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
400 | |
401 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
402 | if (!new_asoc) | |
403 | goto nomem; | |
404 | ||
409b95af VY |
405 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
406 | sctp_scope(sctp_source(chunk)), | |
407 | GFP_ATOMIC) < 0) | |
408 | goto nomem_init; | |
409 | ||
1da177e4 | 410 | /* The call, sctp_process_init(), can fail on memory allocation. */ |
de6becdc | 411 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 412 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
1da177e4 LT |
413 | GFP_ATOMIC)) |
414 | goto nomem_init; | |
415 | ||
1da177e4 LT |
416 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ |
417 | ||
418 | /* If there are errors need to be reported for unknown parameters, | |
419 | * make sure to reserve enough room in the INIT ACK for them. | |
420 | */ | |
421 | len = 0; | |
422 | if (err_chunk) | |
423 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 424 | sizeof(struct sctp_chunkhdr); |
1da177e4 | 425 | |
1da177e4 LT |
426 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
427 | if (!repl) | |
df7deeb5 | 428 | goto nomem_init; |
1da177e4 LT |
429 | |
430 | /* If there are errors need to be reported for unknown parameters, | |
431 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
432 | * parameter. | |
433 | */ | |
434 | if (err_chunk) { | |
435 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
436 | * ERROR chunk generated by sctp_verify_init(). Since the | |
437 | * error cause code for "unknown parameter" and the | |
438 | * "Unrecognized parameter" type is the same, we can | |
439 | * construct the parameters in INIT ACK by copying the | |
440 | * ERROR causes over. | |
441 | */ | |
62e6b7e4 | 442 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 443 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 444 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
445 | /* Replace the cause code with the "Unrecognized parameter" |
446 | * parameter type. | |
447 | */ | |
448 | sctp_addto_chunk(repl, len, unk_param); | |
449 | sctp_chunk_free(err_chunk); | |
450 | } | |
451 | ||
df7deeb5 VY |
452 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); |
453 | ||
1da177e4 LT |
454 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
455 | ||
456 | /* | |
457 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
458 | * "Z" MUST NOT allocate any resources, nor keep any states for the | |
459 | * new association. Otherwise, "Z" will be vulnerable to resource | |
460 | * attacks. | |
461 | */ | |
462 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
463 | ||
464 | return SCTP_DISPOSITION_DELETE_TCB; | |
465 | ||
1da177e4 LT |
466 | nomem_init: |
467 | sctp_association_free(new_asoc); | |
468 | nomem: | |
df7deeb5 VY |
469 | if (err_chunk) |
470 | sctp_chunk_free(err_chunk); | |
1da177e4 LT |
471 | return SCTP_DISPOSITION_NOMEM; |
472 | } | |
473 | ||
474 | /* | |
475 | * Respond to a normal INIT ACK chunk. | |
476 | * We are the side that is initiating the association. | |
477 | * | |
478 | * Section: 5.1 Normal Establishment of an Association, C | |
479 | * C) Upon reception of the INIT ACK from "Z", "A" shall stop the T1-init | |
480 | * timer and leave COOKIE-WAIT state. "A" shall then send the State | |
481 | * Cookie received in the INIT ACK chunk in a COOKIE ECHO chunk, start | |
482 | * the T1-cookie timer, and enter the COOKIE-ECHOED state. | |
483 | * | |
484 | * Note: The COOKIE ECHO chunk can be bundled with any pending outbound | |
485 | * DATA chunks, but it MUST be the first chunk in the packet and | |
486 | * until the COOKIE ACK is returned the sender MUST NOT send any | |
487 | * other packets to the peer. | |
488 | * | |
489 | * Verification Tag: 3.3.3 | |
490 | * If the value of the Initiate Tag in a received INIT ACK chunk is | |
491 | * found to be 0, the receiver MUST treat it as an error and close the | |
492 | * association by transmitting an ABORT. | |
493 | * | |
494 | * Inputs | |
495 | * (endpoint, asoc, chunk) | |
496 | * | |
497 | * Outputs | |
498 | * (asoc, reply_msg, msg_up, timers, counters) | |
499 | * | |
500 | * The return value is the disposition of the chunk. | |
501 | */ | |
172a1599 XL |
502 | enum sctp_disposition sctp_sf_do_5_1C_ack(struct net *net, |
503 | const struct sctp_endpoint *ep, | |
504 | const struct sctp_association *asoc, | |
505 | const union sctp_subtype type, | |
506 | void *arg, | |
507 | struct sctp_cmd_seq *commands) | |
1da177e4 | 508 | { |
01a992be | 509 | struct sctp_init_chunk *initchunk; |
172a1599 | 510 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
511 | struct sctp_chunk *err_chunk; |
512 | struct sctp_packet *packet; | |
1da177e4 LT |
513 | |
514 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 515 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 516 | |
1da177e4 LT |
517 | /* 6.10 Bundling |
518 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
519 | * SHUTDOWN COMPLETE with any other chunks. | |
520 | */ | |
521 | if (!chunk->singleton) | |
24cb81a6 | 522 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 523 | |
ece25dfa | 524 | /* Make sure that the INIT-ACK chunk has a valid length */ |
cb1844c4 | 525 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_initack_chunk))) |
24cb81a6 | 526 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 527 | commands); |
1da177e4 | 528 | /* Grab the INIT header. */ |
4ae70c08 | 529 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 | 530 | |
1da177e4 LT |
531 | /* Verify the INIT chunk before processing it. */ |
532 | err_chunk = NULL; | |
b14878cc | 533 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 534 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
535 | &err_chunk)) { |
536 | ||
2a493216 | 537 | enum sctp_error error = SCTP_ERROR_NO_RESOURCE; |
853f4b50 | 538 | |
1da177e4 | 539 | /* This chunk contains fatal error. It is to be discarded. |
d6701191 VY |
540 | * Send an ABORT, with causes. If there are no causes, |
541 | * then there wasn't enough memory. Just terminate | |
542 | * the association. | |
1da177e4 LT |
543 | */ |
544 | if (err_chunk) { | |
24cb81a6 | 545 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 546 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 547 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 548 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 549 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
550 | |
551 | sctp_chunk_free(err_chunk); | |
552 | ||
553 | if (packet) { | |
554 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
555 | SCTP_PACKET(packet)); | |
24cb81a6 | 556 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
8de8c873 | 557 | error = SCTP_ERROR_INV_PARAM; |
1da177e4 | 558 | } |
1da177e4 | 559 | } |
bbd0d598 VY |
560 | |
561 | /* SCTP-AUTH, Section 6.3: | |
562 | * It should be noted that if the receiver wants to tear | |
563 | * down an association in an authenticated way only, the | |
564 | * handling of malformed packets should not result in | |
565 | * tearing down the association. | |
566 | * | |
567 | * This means that if we only want to abort associations | |
568 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 569 | * can't destroy this association just because the packet |
bbd0d598 VY |
570 | * was malformed. |
571 | */ | |
572 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
24cb81a6 | 573 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 | 574 | |
24cb81a6 EB |
575 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
576 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, | |
8de8c873 | 577 | asoc, chunk->transport); |
1da177e4 LT |
578 | } |
579 | ||
580 | /* Tag the variable length parameters. Note that we never | |
581 | * convert the parameters in an INIT chunk. | |
582 | */ | |
4ae70c08 | 583 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 | 584 | |
01a992be | 585 | initchunk = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
586 | |
587 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_INIT, | |
588 | SCTP_PEER_INIT(initchunk)); | |
589 | ||
3f7a87d2 FF |
590 | /* Reset init error count upon receipt of INIT-ACK. */ |
591 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); | |
592 | ||
1da177e4 LT |
593 | /* 5.1 C) "A" shall stop the T1-init timer and leave |
594 | * COOKIE-WAIT state. "A" shall then ... start the T1-cookie | |
595 | * timer, and enter the COOKIE-ECHOED state. | |
596 | */ | |
597 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
598 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
599 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
600 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
601 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
602 | SCTP_STATE(SCTP_STATE_COOKIE_ECHOED)); | |
603 | ||
730fc3d0 VY |
604 | /* SCTP-AUTH: genereate the assocition shared keys so that |
605 | * we can potentially signe the COOKIE-ECHO. | |
606 | */ | |
607 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_SHKEY, SCTP_NULL()); | |
608 | ||
1da177e4 LT |
609 | /* 5.1 C) "A" shall then send the State Cookie received in the |
610 | * INIT ACK chunk in a COOKIE ECHO chunk, ... | |
611 | */ | |
612 | /* If there is any errors to report, send the ERROR chunk generated | |
613 | * for unknown parameters as well. | |
614 | */ | |
615 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_COOKIE_ECHO, | |
616 | SCTP_CHUNK(err_chunk)); | |
617 | ||
618 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
619 | } |
620 | ||
621 | /* | |
622 | * Respond to a normal COOKIE ECHO chunk. | |
623 | * We are the side that is being asked for an association. | |
624 | * | |
625 | * Section: 5.1 Normal Establishment of an Association, D | |
626 | * D) Upon reception of the COOKIE ECHO chunk, Endpoint "Z" will reply | |
627 | * with a COOKIE ACK chunk after building a TCB and moving to | |
628 | * the ESTABLISHED state. A COOKIE ACK chunk may be bundled with | |
629 | * any pending DATA chunks (and/or SACK chunks), but the COOKIE ACK | |
630 | * chunk MUST be the first chunk in the packet. | |
631 | * | |
632 | * IMPLEMENTATION NOTE: An implementation may choose to send the | |
633 | * Communication Up notification to the SCTP user upon reception | |
634 | * of a valid COOKIE ECHO chunk. | |
635 | * | |
636 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
637 | * D) Rules for packet carrying a COOKIE ECHO | |
638 | * | |
639 | * - When sending a COOKIE ECHO, the endpoint MUST use the value of the | |
640 | * Initial Tag received in the INIT ACK. | |
641 | * | |
642 | * - The receiver of a COOKIE ECHO follows the procedures in Section 5. | |
643 | * | |
644 | * Inputs | |
645 | * (endpoint, asoc, chunk) | |
646 | * | |
647 | * Outputs | |
648 | * (asoc, reply_msg, msg_up, timers, counters) | |
649 | * | |
650 | * The return value is the disposition of the chunk. | |
651 | */ | |
172a1599 XL |
652 | enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net, |
653 | const struct sctp_endpoint *ep, | |
654 | const struct sctp_association *asoc, | |
655 | const union sctp_subtype type, | |
656 | void *arg, | |
657 | struct sctp_cmd_seq *commands) | |
1da177e4 | 658 | { |
172a1599 | 659 | struct sctp_ulpevent *ev, *ai_ev = NULL; |
1da177e4 | 660 | struct sctp_association *new_asoc; |
01a992be | 661 | struct sctp_init_chunk *peer_init; |
172a1599 | 662 | struct sctp_chunk *chunk = arg; |
1da177e4 | 663 | struct sctp_chunk *err_chk_p; |
172a1599 | 664 | struct sctp_chunk *repl; |
609ee467 | 665 | struct sock *sk; |
172a1599 | 666 | int error = 0; |
1da177e4 LT |
667 | |
668 | /* If the packet is an OOTB packet which is temporarily on the | |
669 | * control endpoint, respond with an ABORT. | |
670 | */ | |
2ce95503 | 671 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 672 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 673 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 674 | } |
1da177e4 LT |
675 | |
676 | /* Make sure that the COOKIE_ECHO chunk has a valid length. | |
677 | * In this case, we check that we have enough for at least a | |
678 | * chunk header. More detailed verification is done | |
679 | * in sctp_unpack_cookie(). | |
680 | */ | |
922dbc5b | 681 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 682 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 683 | |
609ee467 VY |
684 | /* If the endpoint is not listening or if the number of associations |
685 | * on the TCP-style socket exceed the max backlog, respond with an | |
686 | * ABORT. | |
687 | */ | |
688 | sk = ep->base.sk; | |
689 | if (!sctp_sstate(sk, LISTENING) || | |
690 | (sctp_style(sk, TCP) && sk_acceptq_is_full(sk))) | |
24cb81a6 | 691 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
609ee467 | 692 | |
1da177e4 LT |
693 | /* "Decode" the chunk. We have no optional parameters so we |
694 | * are in good shape. | |
695 | */ | |
d808ad9a | 696 | chunk->subh.cookie_hdr = |
1da177e4 | 697 | (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 698 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 699 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 700 | goto nomem; |
1da177e4 LT |
701 | |
702 | /* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint | |
703 | * "Z" will reply with a COOKIE ACK chunk after building a TCB | |
704 | * and moving to the ESTABLISHED state. | |
705 | */ | |
706 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
707 | &err_chk_p); | |
708 | ||
709 | /* FIXME: | |
710 | * If the re-build failed, what is the proper error path | |
711 | * from here? | |
712 | * | |
713 | * [We should abort the association. --piggy] | |
714 | */ | |
715 | if (!new_asoc) { | |
716 | /* FIXME: Several errors are possible. A bad cookie should | |
717 | * be silently discarded, but think about logging it too. | |
718 | */ | |
719 | switch (error) { | |
720 | case -SCTP_IERROR_NOMEM: | |
721 | goto nomem; | |
722 | ||
723 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 724 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 725 | err_chk_p); |
24cb81a6 | 726 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
727 | |
728 | case -SCTP_IERROR_BAD_SIG: | |
729 | default: | |
24cb81a6 | 730 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 731 | } |
1da177e4 LT |
732 | } |
733 | ||
1da177e4 | 734 | |
df7deeb5 VY |
735 | /* Delay state machine commands until later. |
736 | * | |
737 | * Re-build the bind address for the association is done in | |
1da177e4 LT |
738 | * the sctp_unpack_cookie() already. |
739 | */ | |
740 | /* This is a brand-new association, so these are not yet side | |
741 | * effects--it is safe to run them here. | |
742 | */ | |
743 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
744 | ||
de6becdc | 745 | if (!sctp_process_init(new_asoc, chunk, |
6a1e5f33 | 746 | &chunk->subh.cookie_hdr->c.peer_addr, |
1da177e4 LT |
747 | peer_init, GFP_ATOMIC)) |
748 | goto nomem_init; | |
749 | ||
730fc3d0 VY |
750 | /* SCTP-AUTH: Now that we've populate required fields in |
751 | * sctp_process_init, set up the assocaition shared keys as | |
752 | * necessary so that we can potentially authenticate the ACK | |
753 | */ | |
754 | error = sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC); | |
755 | if (error) | |
756 | goto nomem_init; | |
757 | ||
bbd0d598 VY |
758 | /* SCTP-AUTH: auth_chunk pointer is only set when the cookie-echo |
759 | * is supposed to be authenticated and we have to do delayed | |
760 | * authentication. We've just recreated the association using | |
761 | * the information in the cookie and now it's much easier to | |
762 | * do the authentication. | |
763 | */ | |
764 | if (chunk->auth_chunk) { | |
765 | struct sctp_chunk auth; | |
4785c7ae | 766 | enum sctp_ierror ret; |
bbd0d598 | 767 | |
ec0223ec DB |
768 | /* Make sure that we and the peer are AUTH capable */ |
769 | if (!net->sctp.auth_enable || !new_asoc->peer.auth_capable) { | |
ec0223ec DB |
770 | sctp_association_free(new_asoc); |
771 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
772 | } | |
773 | ||
bbd0d598 VY |
774 | /* set-up our fake chunk so that we can process it */ |
775 | auth.skb = chunk->auth_chunk; | |
776 | auth.asoc = chunk->asoc; | |
777 | auth.sctp_hdr = chunk->sctp_hdr; | |
922dbc5b XL |
778 | auth.chunk_hdr = (struct sctp_chunkhdr *) |
779 | skb_push(chunk->auth_chunk, | |
780 | sizeof(struct sctp_chunkhdr)); | |
781 | skb_pull(chunk->auth_chunk, sizeof(struct sctp_chunkhdr)); | |
bbd0d598 VY |
782 | auth.transport = chunk->transport; |
783 | ||
24cb81a6 | 784 | ret = sctp_sf_authenticate(net, ep, new_asoc, type, &auth); |
bbd0d598 VY |
785 | if (ret != SCTP_IERROR_NO_ERROR) { |
786 | sctp_association_free(new_asoc); | |
24cb81a6 | 787 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 VY |
788 | } |
789 | } | |
790 | ||
1da177e4 LT |
791 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
792 | if (!repl) | |
df7deeb5 | 793 | goto nomem_init; |
1da177e4 LT |
794 | |
795 | /* RFC 2960 5.1 Normal Establishment of an Association | |
796 | * | |
797 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
798 | * send the Communication Up notification to the SCTP user | |
799 | * upon reception of a valid COOKIE ECHO chunk. | |
800 | */ | |
801 | ev = sctp_ulpevent_make_assoc_change(new_asoc, 0, SCTP_COMM_UP, 0, | |
802 | new_asoc->c.sinit_num_ostreams, | |
803 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 804 | NULL, GFP_ATOMIC); |
1da177e4 LT |
805 | if (!ev) |
806 | goto nomem_ev; | |
807 | ||
d808ad9a | 808 | /* Sockets API Draft Section 5.3.1.6 |
0f3fffd8 | 809 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 810 | * delivers this notification to inform the application that of the |
0f3fffd8 | 811 | * peers requested adaptation layer. |
1da177e4 | 812 | */ |
0f3fffd8 ISJ |
813 | if (new_asoc->peer.adaptation_ind) { |
814 | ai_ev = sctp_ulpevent_make_adaptation_indication(new_asoc, | |
1da177e4 | 815 | GFP_ATOMIC); |
df7deeb5 VY |
816 | if (!ai_ev) |
817 | goto nomem_aiev; | |
818 | } | |
819 | ||
820 | /* Add all the state machine commands now since we've created | |
821 | * everything. This way we don't introduce memory corruptions | |
822 | * during side-effect processing and correclty count established | |
823 | * associations. | |
824 | */ | |
825 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
826 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
827 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
828 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
829 | SCTP_INC_STATS(net, SCTP_MIB_PASSIVEESTABS); | |
df7deeb5 VY |
830 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
831 | ||
9f70f46b | 832 | if (new_asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
df7deeb5 VY |
833 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
834 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
835 | ||
df7deeb5 VY |
836 | /* This will send the COOKIE ACK */ |
837 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
838 | ||
839 | /* Queue the ASSOC_CHANGE event */ | |
840 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
841 | ||
842 | /* Send up the Adaptation Layer Indication event */ | |
843 | if (ai_ev) | |
1da177e4 | 844 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
df7deeb5 | 845 | SCTP_ULPEVENT(ai_ev)); |
1da177e4 LT |
846 | |
847 | return SCTP_DISPOSITION_CONSUME; | |
848 | ||
df7deeb5 VY |
849 | nomem_aiev: |
850 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
851 | nomem_ev: |
852 | sctp_chunk_free(repl); | |
1da177e4 LT |
853 | nomem_init: |
854 | sctp_association_free(new_asoc); | |
855 | nomem: | |
856 | return SCTP_DISPOSITION_NOMEM; | |
857 | } | |
858 | ||
859 | /* | |
860 | * Respond to a normal COOKIE ACK chunk. | |
b52effd2 | 861 | * We are the side that is asking for an association. |
1da177e4 LT |
862 | * |
863 | * RFC 2960 5.1 Normal Establishment of an Association | |
864 | * | |
865 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move from the | |
866 | * COOKIE-ECHOED state to the ESTABLISHED state, stopping the T1-cookie | |
867 | * timer. It may also notify its ULP about the successful | |
868 | * establishment of the association with a Communication Up | |
869 | * notification (see Section 10). | |
870 | * | |
871 | * Verification Tag: | |
872 | * Inputs | |
873 | * (endpoint, asoc, chunk) | |
874 | * | |
875 | * Outputs | |
876 | * (asoc, reply_msg, msg_up, timers, counters) | |
877 | * | |
878 | * The return value is the disposition of the chunk. | |
879 | */ | |
172a1599 XL |
880 | enum sctp_disposition sctp_sf_do_5_1E_ca(struct net *net, |
881 | const struct sctp_endpoint *ep, | |
882 | const struct sctp_association *asoc, | |
883 | const union sctp_subtype type, | |
884 | void *arg, | |
885 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
886 | { |
887 | struct sctp_chunk *chunk = arg; | |
888 | struct sctp_ulpevent *ev; | |
889 | ||
890 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 891 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
892 | |
893 | /* Verify that the chunk length for the COOKIE-ACK is OK. | |
894 | * If we don't do this, any bundled chunks may be junked. | |
895 | */ | |
922dbc5b | 896 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 897 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
898 | commands); |
899 | ||
900 | /* Reset init error count upon receipt of COOKIE-ACK, | |
901 | * to avoid problems with the managemement of this | |
902 | * counter in stale cookie situations when a transition back | |
903 | * from the COOKIE-ECHOED state to the COOKIE-WAIT | |
904 | * state is performed. | |
905 | */ | |
3f7a87d2 | 906 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); |
1da177e4 LT |
907 | |
908 | /* RFC 2960 5.1 Normal Establishment of an Association | |
909 | * | |
910 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move | |
911 | * from the COOKIE-ECHOED state to the ESTABLISHED state, | |
912 | * stopping the T1-cookie timer. | |
913 | */ | |
914 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
915 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
916 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
917 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
918 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
919 | SCTP_INC_STATS(net, SCTP_MIB_ACTIVEESTABS); | |
1da177e4 | 920 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
9f70f46b | 921 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
922 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
923 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
1da177e4 LT |
924 | |
925 | /* It may also notify its ULP about the successful | |
926 | * establishment of the association with a Communication Up | |
927 | * notification (see Section 10). | |
928 | */ | |
929 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_UP, | |
930 | 0, asoc->c.sinit_num_ostreams, | |
931 | asoc->c.sinit_max_instreams, | |
a5a35e76 | 932 | NULL, GFP_ATOMIC); |
1da177e4 LT |
933 | |
934 | if (!ev) | |
935 | goto nomem; | |
936 | ||
937 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
938 | ||
939 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 940 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 941 | * delivers this notification to inform the application that of the |
0f3fffd8 | 942 | * peers requested adaptation layer. |
1da177e4 | 943 | */ |
0f3fffd8 ISJ |
944 | if (asoc->peer.adaptation_ind) { |
945 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1da177e4 LT |
946 | if (!ev) |
947 | goto nomem; | |
948 | ||
949 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
950 | SCTP_ULPEVENT(ev)); | |
951 | } | |
952 | ||
953 | return SCTP_DISPOSITION_CONSUME; | |
954 | nomem: | |
955 | return SCTP_DISPOSITION_NOMEM; | |
956 | } | |
957 | ||
958 | /* Generate and sendout a heartbeat packet. */ | |
172a1599 XL |
959 | static enum sctp_disposition sctp_sf_heartbeat( |
960 | const struct sctp_endpoint *ep, | |
961 | const struct sctp_association *asoc, | |
962 | const union sctp_subtype type, | |
963 | void *arg, | |
964 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
965 | { |
966 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
967 | struct sctp_chunk *reply; | |
1da177e4 LT |
968 | |
969 | /* Send a heartbeat to our peer. */ | |
92c73af5 | 970 | reply = sctp_make_heartbeat(asoc, transport); |
1da177e4 LT |
971 | if (!reply) |
972 | return SCTP_DISPOSITION_NOMEM; | |
973 | ||
974 | /* Set rto_pending indicating that an RTT measurement | |
975 | * is started with this heartbeat chunk. | |
976 | */ | |
977 | sctp_add_cmd_sf(commands, SCTP_CMD_RTO_PENDING, | |
978 | SCTP_TRANSPORT(transport)); | |
979 | ||
980 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
981 | return SCTP_DISPOSITION_CONSUME; | |
982 | } | |
983 | ||
984 | /* Generate a HEARTBEAT packet on the given transport. */ | |
172a1599 XL |
985 | enum sctp_disposition sctp_sf_sendbeat_8_3(struct net *net, |
986 | const struct sctp_endpoint *ep, | |
987 | const struct sctp_association *asoc, | |
988 | const union sctp_subtype type, | |
989 | void *arg, | |
990 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
991 | { |
992 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
993 | ||
b9f84786 | 994 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
995 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
996 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
997 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
998 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 999 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
1000 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1001 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
1002 | return SCTP_DISPOSITION_DELETE_TCB; |
1003 | } | |
1004 | ||
1005 | /* Section 3.3.5. | |
1006 | * The Sender-specific Heartbeat Info field should normally include | |
1007 | * information about the sender's current time when this HEARTBEAT | |
1008 | * chunk is sent and the destination transport address to which this | |
1009 | * HEARTBEAT is sent (see Section 8.3). | |
1010 | */ | |
1011 | ||
52ccb8e9 | 1012 | if (transport->param_flags & SPP_HB_ENABLE) { |
1da177e4 LT |
1013 | if (SCTP_DISPOSITION_NOMEM == |
1014 | sctp_sf_heartbeat(ep, asoc, type, arg, | |
1015 | commands)) | |
1016 | return SCTP_DISPOSITION_NOMEM; | |
245cba7e | 1017 | |
1da177e4 LT |
1018 | /* Set transport error counter and association error counter |
1019 | * when sending heartbeat. | |
1020 | */ | |
7e99013a | 1021 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
1da177e4 LT |
1022 | SCTP_TRANSPORT(transport)); |
1023 | } | |
245cba7e VY |
1024 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_IDLE, |
1025 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
1026 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMER_UPDATE, |
1027 | SCTP_TRANSPORT(transport)); | |
1028 | ||
d808ad9a | 1029 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1030 | } |
1031 | ||
7b9438de | 1032 | /* resend asoc strreset_chunk. */ |
172a1599 XL |
1033 | enum sctp_disposition sctp_sf_send_reconf(struct net *net, |
1034 | const struct sctp_endpoint *ep, | |
1035 | const struct sctp_association *asoc, | |
1036 | const union sctp_subtype type, | |
1037 | void *arg, | |
1038 | struct sctp_cmd_seq *commands) | |
7b9438de XL |
1039 | { |
1040 | struct sctp_transport *transport = arg; | |
1041 | ||
1042 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
1043 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
1044 | SCTP_ERROR(ETIMEDOUT)); | |
1045 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
1046 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
1047 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
1048 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
1049 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1050 | return SCTP_DISPOSITION_DELETE_TCB; | |
1051 | } | |
1052 | ||
1053 | sctp_chunk_hold(asoc->strreset_chunk); | |
1054 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1055 | SCTP_CHUNK(asoc->strreset_chunk)); | |
1056 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
1057 | ||
1058 | return SCTP_DISPOSITION_CONSUME; | |
1059 | } | |
1060 | ||
1da177e4 LT |
1061 | /* |
1062 | * Process an heartbeat request. | |
1063 | * | |
1064 | * Section: 8.3 Path Heartbeat | |
1065 | * The receiver of the HEARTBEAT should immediately respond with a | |
1066 | * HEARTBEAT ACK that contains the Heartbeat Information field copied | |
1067 | * from the received HEARTBEAT chunk. | |
1068 | * | |
1069 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1070 | * When receiving an SCTP packet, the endpoint MUST ensure that the | |
1071 | * value in the Verification Tag field of the received SCTP packet | |
1072 | * matches its own Tag. If the received Verification Tag value does not | |
1073 | * match the receiver's own tag value, the receiver shall silently | |
1074 | * discard the packet and shall not process it any further except for | |
1075 | * those cases listed in Section 8.5.1 below. | |
1076 | * | |
1077 | * Inputs | |
1078 | * (endpoint, asoc, chunk) | |
1079 | * | |
1080 | * Outputs | |
1081 | * (asoc, reply_msg, msg_up, timers, counters) | |
1082 | * | |
1083 | * The return value is the disposition of the chunk. | |
1084 | */ | |
172a1599 XL |
1085 | enum sctp_disposition sctp_sf_beat_8_3(struct net *net, |
1086 | const struct sctp_endpoint *ep, | |
1087 | const struct sctp_association *asoc, | |
1088 | const union sctp_subtype type, | |
1089 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 1090 | { |
3c918704 | 1091 | struct sctp_paramhdr *param_hdr; |
1da177e4 LT |
1092 | struct sctp_chunk *chunk = arg; |
1093 | struct sctp_chunk *reply; | |
1094 | size_t paylen = 0; | |
1095 | ||
1096 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1097 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1098 | |
1099 | /* Make sure that the HEARTBEAT chunk has a valid length. */ | |
38c00f74 XL |
1100 | if (!sctp_chunk_length_valid(chunk, |
1101 | sizeof(struct sctp_heartbeat_chunk))) | |
24cb81a6 | 1102 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1103 | commands); |
1104 | ||
1105 | /* 8.3 The receiver of the HEARTBEAT should immediately | |
1106 | * respond with a HEARTBEAT ACK that contains the Heartbeat | |
1107 | * Information field copied from the received HEARTBEAT chunk. | |
1108 | */ | |
4d2dcdf4 | 1109 | chunk->subh.hb_hdr = (struct sctp_heartbeathdr *)chunk->skb->data; |
3c918704 | 1110 | param_hdr = (struct sctp_paramhdr *)chunk->subh.hb_hdr; |
922dbc5b | 1111 | paylen = ntohs(chunk->chunk_hdr->length) - sizeof(struct sctp_chunkhdr); |
06a31e2b TG |
1112 | |
1113 | if (ntohs(param_hdr->length) > paylen) | |
1114 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
1115 | param_hdr, commands); | |
1116 | ||
62b08083 SS |
1117 | if (!pskb_pull(chunk->skb, paylen)) |
1118 | goto nomem; | |
1da177e4 | 1119 | |
06a31e2b | 1120 | reply = sctp_make_heartbeat_ack(asoc, chunk, param_hdr, paylen); |
1da177e4 LT |
1121 | if (!reply) |
1122 | goto nomem; | |
1123 | ||
1124 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1125 | return SCTP_DISPOSITION_CONSUME; | |
1126 | ||
1127 | nomem: | |
1128 | return SCTP_DISPOSITION_NOMEM; | |
1129 | } | |
1130 | ||
1131 | /* | |
1132 | * Process the returning HEARTBEAT ACK. | |
1133 | * | |
1134 | * Section: 8.3 Path Heartbeat | |
1135 | * Upon the receipt of the HEARTBEAT ACK, the sender of the HEARTBEAT | |
1136 | * should clear the error counter of the destination transport | |
1137 | * address to which the HEARTBEAT was sent, and mark the destination | |
1138 | * transport address as active if it is not so marked. The endpoint may | |
1139 | * optionally report to the upper layer when an inactive destination | |
1140 | * address is marked as active due to the reception of the latest | |
1141 | * HEARTBEAT ACK. The receiver of the HEARTBEAT ACK must also | |
1142 | * clear the association overall error count as well (as defined | |
1143 | * in section 8.1). | |
1144 | * | |
1145 | * The receiver of the HEARTBEAT ACK should also perform an RTT | |
1146 | * measurement for that destination transport address using the time | |
1147 | * value carried in the HEARTBEAT ACK chunk. | |
1148 | * | |
1149 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1150 | * | |
1151 | * Inputs | |
1152 | * (endpoint, asoc, chunk) | |
1153 | * | |
1154 | * Outputs | |
1155 | * (asoc, reply_msg, msg_up, timers, counters) | |
1156 | * | |
1157 | * The return value is the disposition of the chunk. | |
1158 | */ | |
172a1599 XL |
1159 | enum sctp_disposition sctp_sf_backbeat_8_3(struct net *net, |
1160 | const struct sctp_endpoint *ep, | |
1161 | const struct sctp_association *asoc, | |
1162 | const union sctp_subtype type, | |
1163 | void *arg, | |
1164 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1165 | { |
edf903f8 | 1166 | struct sctp_sender_hb_info *hbinfo; |
1da177e4 | 1167 | struct sctp_chunk *chunk = arg; |
1da177e4 | 1168 | struct sctp_transport *link; |
1da177e4 | 1169 | unsigned long max_interval; |
edf903f8 | 1170 | union sctp_addr from_addr; |
1da177e4 LT |
1171 | |
1172 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1173 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1174 | |
1175 | /* Make sure that the HEARTBEAT-ACK chunk has a valid length. */ | |
922dbc5b | 1176 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr) + |
edf903f8 | 1177 | sizeof(*hbinfo))) |
24cb81a6 | 1178 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1179 | commands); |
1180 | ||
edf903f8 | 1181 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
a601266e | 1182 | /* Make sure that the length of the parameter is what we expect */ |
edf903f8 | 1183 | if (ntohs(hbinfo->param_hdr.length) != sizeof(*hbinfo)) |
a601266e | 1184 | return SCTP_DISPOSITION_DISCARD; |
a601266e | 1185 | |
1da177e4 | 1186 | from_addr = hbinfo->daddr; |
63de08f4 | 1187 | link = sctp_assoc_lookup_paddr(asoc, &from_addr); |
1da177e4 LT |
1188 | |
1189 | /* This should never happen, but lets log it if so. */ | |
3f7a87d2 FF |
1190 | if (unlikely(!link)) { |
1191 | if (from_addr.sa.sa_family == AF_INET6) { | |
e87cc472 JP |
1192 | net_warn_ratelimited("%s association %p could not find address %pI6\n", |
1193 | __func__, | |
1194 | asoc, | |
1195 | &from_addr.v6.sin6_addr); | |
3f7a87d2 | 1196 | } else { |
e87cc472 JP |
1197 | net_warn_ratelimited("%s association %p could not find address %pI4\n", |
1198 | __func__, | |
1199 | asoc, | |
1200 | &from_addr.v4.sin_addr.s_addr); | |
3f7a87d2 | 1201 | } |
1da177e4 LT |
1202 | return SCTP_DISPOSITION_DISCARD; |
1203 | } | |
1204 | ||
ad8fec17 SS |
1205 | /* Validate the 64-bit random nonce. */ |
1206 | if (hbinfo->hb_nonce != link->hb_nonce) | |
1207 | return SCTP_DISPOSITION_DISCARD; | |
1208 | ||
52ccb8e9 | 1209 | max_interval = link->hbinterval + link->rto; |
1da177e4 LT |
1210 | |
1211 | /* Check if the timestamp looks valid. */ | |
1212 | if (time_after(hbinfo->sent_at, jiffies) || | |
1213 | time_after(jiffies, hbinfo->sent_at + max_interval)) { | |
bb33381d DB |
1214 | pr_debug("%s: HEARTBEAT ACK with invalid timestamp received " |
1215 | "for transport:%p\n", __func__, link); | |
1216 | ||
1da177e4 LT |
1217 | return SCTP_DISPOSITION_DISCARD; |
1218 | } | |
1219 | ||
1220 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of | |
1221 | * the HEARTBEAT should clear the error counter of the | |
1222 | * destination transport address to which the HEARTBEAT was | |
1223 | * sent and mark the destination transport address as active if | |
1224 | * it is not so marked. | |
1225 | */ | |
1226 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_ON, SCTP_TRANSPORT(link)); | |
1227 | ||
1228 | return SCTP_DISPOSITION_CONSUME; | |
1229 | } | |
1230 | ||
1231 | /* Helper function to send out an abort for the restart | |
1232 | * condition. | |
1233 | */ | |
2ce95503 | 1234 | static int sctp_sf_send_restart_abort(struct net *net, union sctp_addr *ssa, |
1da177e4 | 1235 | struct sctp_chunk *init, |
a85bbeb2 | 1236 | struct sctp_cmd_seq *commands) |
1da177e4 | 1237 | { |
172a1599 | 1238 | struct sctp_af *af = sctp_get_af_specific(ssa->v4.sin_family); |
1da177e4 LT |
1239 | union sctp_addr_param *addrparm; |
1240 | struct sctp_errhdr *errhdr; | |
d8238d9d | 1241 | char buffer[sizeof(*errhdr) + sizeof(*addrparm)]; |
172a1599 XL |
1242 | struct sctp_endpoint *ep; |
1243 | struct sctp_packet *pkt; | |
1244 | int len; | |
1da177e4 LT |
1245 | |
1246 | /* Build the error on the stack. We are way to malloc crazy | |
1247 | * throughout the code today. | |
1248 | */ | |
1249 | errhdr = (struct sctp_errhdr *)buffer; | |
1250 | addrparm = (union sctp_addr_param *)errhdr->variable; | |
1251 | ||
1252 | /* Copy into a parm format. */ | |
1253 | len = af->to_addr_param(ssa, addrparm); | |
d8238d9d | 1254 | len += sizeof(*errhdr); |
1da177e4 LT |
1255 | |
1256 | errhdr->cause = SCTP_ERROR_RESTART; | |
1257 | errhdr->length = htons(len); | |
1258 | ||
1259 | /* Assign to the control socket. */ | |
2ce95503 | 1260 | ep = sctp_sk(net->sctp.ctl_sock)->ep; |
1da177e4 LT |
1261 | |
1262 | /* Association is NULL since this may be a restart attack and we | |
1263 | * want to send back the attacker's vtag. | |
1264 | */ | |
24cb81a6 | 1265 | pkt = sctp_abort_pkt_new(net, ep, NULL, init, errhdr, len); |
1da177e4 LT |
1266 | |
1267 | if (!pkt) | |
1268 | goto out; | |
1269 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(pkt)); | |
1270 | ||
b01a2407 | 1271 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1272 | |
1273 | /* Discard the rest of the inbound packet. */ | |
1274 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); | |
1275 | ||
1276 | out: | |
1277 | /* Even if there is no memory, treat as a failure so | |
1278 | * the packet will get dropped. | |
1279 | */ | |
1280 | return 0; | |
1281 | } | |
1282 | ||
123031c0 JP |
1283 | static bool list_has_sctp_addr(const struct list_head *list, |
1284 | union sctp_addr *ipaddr) | |
1285 | { | |
1286 | struct sctp_transport *addr; | |
1287 | ||
1288 | list_for_each_entry(addr, list, transports) { | |
1289 | if (sctp_cmp_addr_exact(ipaddr, &addr->ipaddr)) | |
1290 | return true; | |
1291 | } | |
1292 | ||
1293 | return false; | |
1294 | } | |
1da177e4 LT |
1295 | /* A restart is occurring, check to make sure no new addresses |
1296 | * are being added as we may be under a takeover attack. | |
1297 | */ | |
1298 | static int sctp_sf_check_restart_addrs(const struct sctp_association *new_asoc, | |
1299 | const struct sctp_association *asoc, | |
1300 | struct sctp_chunk *init, | |
a85bbeb2 | 1301 | struct sctp_cmd_seq *commands) |
1da177e4 | 1302 | { |
2ce95503 | 1303 | struct net *net = sock_net(new_asoc->base.sk); |
123031c0 JP |
1304 | struct sctp_transport *new_addr; |
1305 | int ret = 1; | |
1da177e4 | 1306 | |
123031c0 | 1307 | /* Implementor's Guide - Section 5.2.2 |
1da177e4 LT |
1308 | * ... |
1309 | * Before responding the endpoint MUST check to see if the | |
1310 | * unexpected INIT adds new addresses to the association. If new | |
1311 | * addresses are added to the association, the endpoint MUST respond | |
1312 | * with an ABORT.. | |
1313 | */ | |
1314 | ||
1315 | /* Search through all current addresses and make sure | |
1316 | * we aren't adding any new ones. | |
1317 | */ | |
9dbc15f0 | 1318 | list_for_each_entry(new_addr, &new_asoc->peer.transport_addr_list, |
123031c0 JP |
1319 | transports) { |
1320 | if (!list_has_sctp_addr(&asoc->peer.transport_addr_list, | |
1321 | &new_addr->ipaddr)) { | |
2ce95503 | 1322 | sctp_sf_send_restart_abort(net, &new_addr->ipaddr, init, |
123031c0 JP |
1323 | commands); |
1324 | ret = 0; | |
1da177e4 | 1325 | break; |
123031c0 | 1326 | } |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | /* Return success if all addresses were found. */ | |
123031c0 | 1330 | return ret; |
1da177e4 LT |
1331 | } |
1332 | ||
1333 | /* Populate the verification/tie tags based on overlapping INIT | |
1334 | * scenario. | |
1335 | * | |
1336 | * Note: Do not use in CLOSED or SHUTDOWN-ACK-SENT state. | |
1337 | */ | |
1338 | static void sctp_tietags_populate(struct sctp_association *new_asoc, | |
1339 | const struct sctp_association *asoc) | |
1340 | { | |
1341 | switch (asoc->state) { | |
1342 | ||
1343 | /* 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State */ | |
1344 | ||
1345 | case SCTP_STATE_COOKIE_WAIT: | |
1346 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1347 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1348 | new_asoc->c.peer_ttag = 0; | |
1349 | break; | |
1350 | ||
1351 | case SCTP_STATE_COOKIE_ECHOED: | |
1352 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1353 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1354 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1355 | break; | |
1356 | ||
1357 | /* 5.2.2 Unexpected INIT in States Other than CLOSED, COOKIE-ECHOED, | |
1358 | * COOKIE-WAIT and SHUTDOWN-ACK-SENT | |
1359 | */ | |
1360 | default: | |
1361 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1362 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1363 | break; | |
3ff50b79 | 1364 | } |
1da177e4 LT |
1365 | |
1366 | /* Other parameters for the endpoint SHOULD be copied from the | |
1367 | * existing parameters of the association (e.g. number of | |
1368 | * outbound streams) into the INIT ACK and cookie. | |
1369 | */ | |
1370 | new_asoc->rwnd = asoc->rwnd; | |
1371 | new_asoc->c.sinit_num_ostreams = asoc->c.sinit_num_ostreams; | |
1372 | new_asoc->c.sinit_max_instreams = asoc->c.sinit_max_instreams; | |
1373 | new_asoc->c.initial_tsn = asoc->c.initial_tsn; | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * Compare vtag/tietag values to determine unexpected COOKIE-ECHO | |
1378 | * handling action. | |
1379 | * | |
1380 | * RFC 2960 5.2.4 Handle a COOKIE ECHO when a TCB exists. | |
1381 | * | |
1382 | * Returns value representing action to be taken. These action values | |
1383 | * correspond to Action/Description values in RFC 2960, Table 2. | |
1384 | */ | |
1385 | static char sctp_tietags_compare(struct sctp_association *new_asoc, | |
1386 | const struct sctp_association *asoc) | |
1387 | { | |
1388 | /* In this case, the peer may have restarted. */ | |
1389 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1390 | (asoc->c.peer_vtag != new_asoc->c.peer_vtag) && | |
1391 | (asoc->c.my_vtag == new_asoc->c.my_ttag) && | |
1392 | (asoc->c.peer_vtag == new_asoc->c.peer_ttag)) | |
1393 | return 'A'; | |
1394 | ||
1395 | /* Collision case B. */ | |
1396 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1397 | ((asoc->c.peer_vtag != new_asoc->c.peer_vtag) || | |
1398 | (0 == asoc->c.peer_vtag))) { | |
1399 | return 'B'; | |
1400 | } | |
1401 | ||
1402 | /* Collision case D. */ | |
1403 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1404 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag)) | |
1405 | return 'D'; | |
1406 | ||
1407 | /* Collision case C. */ | |
1408 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1409 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag) && | |
1410 | (0 == new_asoc->c.my_ttag) && | |
1411 | (0 == new_asoc->c.peer_ttag)) | |
1412 | return 'C'; | |
1413 | ||
1414 | /* No match to any of the special cases; discard this packet. */ | |
1415 | return 'E'; | |
1416 | } | |
1417 | ||
1418 | /* Common helper routine for both duplicate and simulataneous INIT | |
1419 | * chunk handling. | |
1420 | */ | |
172a1599 XL |
1421 | static enum sctp_disposition sctp_sf_do_unexpected_init( |
1422 | struct net *net, | |
1423 | const struct sctp_endpoint *ep, | |
1424 | const struct sctp_association *asoc, | |
1425 | const union sctp_subtype type, | |
1426 | void *arg, | |
1427 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1428 | { |
62e6b7e4 XL |
1429 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
1430 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 1431 | struct sctp_association *new_asoc; |
172a1599 | 1432 | enum sctp_disposition retval; |
1da177e4 | 1433 | struct sctp_packet *packet; |
1da177e4 LT |
1434 | int len; |
1435 | ||
1436 | /* 6.10 Bundling | |
1437 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
1438 | * SHUTDOWN COMPLETE with any other chunks. | |
1439 | * | |
1440 | * IG Section 2.11.2 | |
1441 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
1442 | * enforce these rules by silently discarding an arriving packet | |
1443 | * with an INIT chunk that is bundled with other chunks. | |
1444 | */ | |
1445 | if (!chunk->singleton) | |
24cb81a6 | 1446 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1447 | |
1448 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification | |
d808ad9a | 1449 | * Tag. |
1da177e4 LT |
1450 | */ |
1451 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 1452 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1453 | |
1454 | /* Make sure that the INIT chunk has a valid length. | |
1455 | * In this case, we generate a protocol violation since we have | |
1456 | * an association established. | |
1457 | */ | |
01a992be | 1458 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 1459 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1460 | commands); |
1461 | /* Grab the INIT header. */ | |
4ae70c08 | 1462 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
1463 | |
1464 | /* Tag the variable length parameters. */ | |
4ae70c08 | 1465 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
1466 | |
1467 | /* Verify the INIT chunk before processing it. */ | |
1468 | err_chunk = NULL; | |
b14878cc | 1469 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 1470 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
1471 | &err_chunk)) { |
1472 | /* This chunk contains fatal error. It is to be discarded. | |
1473 | * Send an ABORT, with causes if there is any. | |
1474 | */ | |
1475 | if (err_chunk) { | |
24cb81a6 | 1476 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 1477 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1478 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 1479 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 1480 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1481 | |
1482 | if (packet) { | |
1483 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
1484 | SCTP_PACKET(packet)); | |
24cb81a6 | 1485 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1486 | retval = SCTP_DISPOSITION_CONSUME; |
1487 | } else { | |
1488 | retval = SCTP_DISPOSITION_NOMEM; | |
1489 | } | |
1490 | goto cleanup; | |
1491 | } else { | |
24cb81a6 | 1492 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
1493 | commands); |
1494 | } | |
1495 | } | |
1496 | ||
1497 | /* | |
1498 | * Other parameters for the endpoint SHOULD be copied from the | |
1499 | * existing parameters of the association (e.g. number of | |
1500 | * outbound streams) into the INIT ACK and cookie. | |
1501 | * FIXME: We are copying parameters from the endpoint not the | |
1502 | * association. | |
1503 | */ | |
1504 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
1505 | if (!new_asoc) | |
1506 | goto nomem; | |
1507 | ||
409b95af VY |
1508 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
1509 | sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0) | |
1510 | goto nomem; | |
1511 | ||
1da177e4 LT |
1512 | /* In the outbound INIT ACK the endpoint MUST copy its current |
1513 | * Verification Tag and Peers Verification tag into a reserved | |
1514 | * place (local tie-tag and per tie-tag) within the state cookie. | |
1515 | */ | |
de6becdc | 1516 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 1517 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
df7deeb5 VY |
1518 | GFP_ATOMIC)) |
1519 | goto nomem; | |
1da177e4 LT |
1520 | |
1521 | /* Make sure no new addresses are being added during the | |
1522 | * restart. Do not do this check for COOKIE-WAIT state, | |
1523 | * since there are no peer addresses to check against. | |
1524 | * Upon return an ABORT will have been sent if needed. | |
1525 | */ | |
1526 | if (!sctp_state(asoc, COOKIE_WAIT)) { | |
1527 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, | |
1528 | commands)) { | |
1529 | retval = SCTP_DISPOSITION_CONSUME; | |
df7deeb5 | 1530 | goto nomem_retval; |
1da177e4 LT |
1531 | } |
1532 | } | |
1533 | ||
1534 | sctp_tietags_populate(new_asoc, asoc); | |
1535 | ||
1536 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ | |
1537 | ||
1538 | /* If there are errors need to be reported for unknown parameters, | |
1539 | * make sure to reserve enough room in the INIT ACK for them. | |
1540 | */ | |
1541 | len = 0; | |
1542 | if (err_chunk) { | |
1543 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 1544 | sizeof(struct sctp_chunkhdr); |
1da177e4 LT |
1545 | } |
1546 | ||
1da177e4 LT |
1547 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
1548 | if (!repl) | |
1549 | goto nomem; | |
1550 | ||
1551 | /* If there are errors need to be reported for unknown parameters, | |
1552 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
1553 | * parameter. | |
1554 | */ | |
1555 | if (err_chunk) { | |
1556 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
1557 | * ERROR chunk generated by sctp_verify_init(). Since the | |
1558 | * error cause code for "unknown parameter" and the | |
1559 | * "Unrecognized parameter" type is the same, we can | |
1560 | * construct the parameters in INIT ACK by copying the | |
1561 | * ERROR causes over. | |
1562 | */ | |
62e6b7e4 | 1563 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 1564 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1565 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1566 | /* Replace the cause code with the "Unrecognized parameter" |
1567 | * parameter type. | |
1568 | */ | |
1569 | sctp_addto_chunk(repl, len, unk_param); | |
1570 | } | |
1571 | ||
1572 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
1573 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1574 | ||
1575 | /* | |
1576 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
1577 | * "Z" MUST NOT allocate any resources for this new association. | |
1578 | * Otherwise, "Z" will be vulnerable to resource attacks. | |
1579 | */ | |
1580 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
1581 | retval = SCTP_DISPOSITION_CONSUME; | |
1582 | ||
df7deeb5 VY |
1583 | return retval; |
1584 | ||
1585 | nomem: | |
1586 | retval = SCTP_DISPOSITION_NOMEM; | |
1587 | nomem_retval: | |
1588 | if (new_asoc) | |
1589 | sctp_association_free(new_asoc); | |
1da177e4 LT |
1590 | cleanup: |
1591 | if (err_chunk) | |
1592 | sctp_chunk_free(err_chunk); | |
1593 | return retval; | |
1da177e4 LT |
1594 | } |
1595 | ||
1596 | /* | |
25985edc | 1597 | * Handle simultaneous INIT. |
1da177e4 LT |
1598 | * This means we started an INIT and then we got an INIT request from |
1599 | * our peer. | |
1600 | * | |
1601 | * Section: 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State (Item B) | |
1602 | * This usually indicates an initialization collision, i.e., each | |
1603 | * endpoint is attempting, at about the same time, to establish an | |
1604 | * association with the other endpoint. | |
1605 | * | |
1606 | * Upon receipt of an INIT in the COOKIE-WAIT or COOKIE-ECHOED state, an | |
1607 | * endpoint MUST respond with an INIT ACK using the same parameters it | |
1608 | * sent in its original INIT chunk (including its Verification Tag, | |
1609 | * unchanged). These original parameters are combined with those from the | |
1610 | * newly received INIT chunk. The endpoint shall also generate a State | |
1611 | * Cookie with the INIT ACK. The endpoint uses the parameters sent in its | |
1612 | * INIT to calculate the State Cookie. | |
1613 | * | |
1614 | * After that, the endpoint MUST NOT change its state, the T1-init | |
1615 | * timer shall be left running and the corresponding TCB MUST NOT be | |
1616 | * destroyed. The normal procedures for handling State Cookies when | |
1617 | * a TCB exists will resolve the duplicate INITs to a single association. | |
1618 | * | |
1619 | * For an endpoint that is in the COOKIE-ECHOED state it MUST populate | |
1620 | * its Tie-Tags with the Tag information of itself and its peer (see | |
1621 | * section 5.2.2 for a description of the Tie-Tags). | |
1622 | * | |
1623 | * Verification Tag: Not explicit, but an INIT can not have a valid | |
1624 | * verification tag, so we skip the check. | |
1625 | * | |
1626 | * Inputs | |
1627 | * (endpoint, asoc, chunk) | |
1628 | * | |
1629 | * Outputs | |
1630 | * (asoc, reply_msg, msg_up, timers, counters) | |
1631 | * | |
1632 | * The return value is the disposition of the chunk. | |
1633 | */ | |
172a1599 XL |
1634 | enum sctp_disposition sctp_sf_do_5_2_1_siminit( |
1635 | struct net *net, | |
1636 | const struct sctp_endpoint *ep, | |
1637 | const struct sctp_association *asoc, | |
1638 | const union sctp_subtype type, | |
1639 | void *arg, | |
1640 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1641 | { |
1642 | /* Call helper to do the real work for both simulataneous and | |
1643 | * duplicate INIT chunk handling. | |
1644 | */ | |
24cb81a6 | 1645 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1646 | } |
1647 | ||
1648 | /* | |
1649 | * Handle duplicated INIT messages. These are usually delayed | |
1650 | * restransmissions. | |
1651 | * | |
1652 | * Section: 5.2.2 Unexpected INIT in States Other than CLOSED, | |
1653 | * COOKIE-ECHOED and COOKIE-WAIT | |
1654 | * | |
1655 | * Unless otherwise stated, upon reception of an unexpected INIT for | |
1656 | * this association, the endpoint shall generate an INIT ACK with a | |
1657 | * State Cookie. In the outbound INIT ACK the endpoint MUST copy its | |
1658 | * current Verification Tag and peer's Verification Tag into a reserved | |
1659 | * place within the state cookie. We shall refer to these locations as | |
1660 | * the Peer's-Tie-Tag and the Local-Tie-Tag. The outbound SCTP packet | |
1661 | * containing this INIT ACK MUST carry a Verification Tag value equal to | |
1662 | * the Initiation Tag found in the unexpected INIT. And the INIT ACK | |
1663 | * MUST contain a new Initiation Tag (randomly generated see Section | |
1664 | * 5.3.1). Other parameters for the endpoint SHOULD be copied from the | |
1665 | * existing parameters of the association (e.g. number of outbound | |
1666 | * streams) into the INIT ACK and cookie. | |
1667 | * | |
1668 | * After sending out the INIT ACK, the endpoint shall take no further | |
1669 | * actions, i.e., the existing association, including its current state, | |
1670 | * and the corresponding TCB MUST NOT be changed. | |
1671 | * | |
1672 | * Note: Only when a TCB exists and the association is not in a COOKIE- | |
1673 | * WAIT state are the Tie-Tags populated. For a normal association INIT | |
1674 | * (i.e. the endpoint is in a COOKIE-WAIT state), the Tie-Tags MUST be | |
1675 | * set to 0 (indicating that no previous TCB existed). The INIT ACK and | |
1676 | * State Cookie are populated as specified in section 5.2.1. | |
1677 | * | |
1678 | * Verification Tag: Not specified, but an INIT has no way of knowing | |
1679 | * what the verification tag could be, so we ignore it. | |
1680 | * | |
1681 | * Inputs | |
1682 | * (endpoint, asoc, chunk) | |
1683 | * | |
1684 | * Outputs | |
1685 | * (asoc, reply_msg, msg_up, timers, counters) | |
1686 | * | |
1687 | * The return value is the disposition of the chunk. | |
1688 | */ | |
172a1599 XL |
1689 | enum sctp_disposition sctp_sf_do_5_2_2_dupinit( |
1690 | struct net *net, | |
24cb81a6 | 1691 | const struct sctp_endpoint *ep, |
1da177e4 | 1692 | const struct sctp_association *asoc, |
bfc6f827 | 1693 | const union sctp_subtype type, |
1da177e4 | 1694 | void *arg, |
a85bbeb2 | 1695 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
1696 | { |
1697 | /* Call helper to do the real work for both simulataneous and | |
1698 | * duplicate INIT chunk handling. | |
1699 | */ | |
24cb81a6 | 1700 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1701 | } |
1702 | ||
1703 | ||
610ab73a VY |
1704 | /* |
1705 | * Unexpected INIT-ACK handler. | |
1706 | * | |
1707 | * Section 5.2.3 | |
1708 | * If an INIT ACK received by an endpoint in any state other than the | |
1709 | * COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk. | |
1710 | * An unexpected INIT ACK usually indicates the processing of an old or | |
1711 | * duplicated INIT chunk. | |
1712 | */ | |
172a1599 XL |
1713 | enum sctp_disposition sctp_sf_do_5_2_3_initack( |
1714 | struct net *net, | |
1715 | const struct sctp_endpoint *ep, | |
1716 | const struct sctp_association *asoc, | |
1717 | const union sctp_subtype type, | |
1718 | void *arg, | |
1719 | struct sctp_cmd_seq *commands) | |
610ab73a VY |
1720 | { |
1721 | /* Per the above section, we'll discard the chunk if we have an | |
1722 | * endpoint. If this is an OOTB INIT-ACK, treat it as such. | |
1723 | */ | |
2ce95503 | 1724 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) |
24cb81a6 | 1725 | return sctp_sf_ootb(net, ep, asoc, type, arg, commands); |
610ab73a | 1726 | else |
24cb81a6 | 1727 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
610ab73a | 1728 | } |
1da177e4 LT |
1729 | |
1730 | /* Unexpected COOKIE-ECHO handler for peer restart (Table 2, action 'A') | |
1731 | * | |
1732 | * Section 5.2.4 | |
1733 | * A) In this case, the peer may have restarted. | |
1734 | */ | |
172a1599 XL |
1735 | static enum sctp_disposition sctp_sf_do_dupcook_a( |
1736 | struct net *net, | |
24cb81a6 | 1737 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1738 | const struct sctp_association *asoc, |
1739 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1740 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1741 | struct sctp_association *new_asoc) |
1742 | { | |
01a992be | 1743 | struct sctp_init_chunk *peer_init; |
172a1599 | 1744 | enum sctp_disposition disposition; |
1da177e4 LT |
1745 | struct sctp_ulpevent *ev; |
1746 | struct sctp_chunk *repl; | |
1747 | struct sctp_chunk *err; | |
1da177e4 LT |
1748 | |
1749 | /* new_asoc is a brand-new association, so these are not yet | |
1750 | * side effects--it is safe to run them here. | |
1751 | */ | |
1752 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
1753 | ||
de6becdc | 1754 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1755 | GFP_ATOMIC)) |
1756 | goto nomem; | |
1757 | ||
1758 | /* Make sure no new addresses are being added during the | |
1759 | * restart. Though this is a pretty complicated attack | |
1760 | * since you'd have to get inside the cookie. | |
1761 | */ | |
1762 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, commands)) { | |
1763 | return SCTP_DISPOSITION_CONSUME; | |
1764 | } | |
1765 | ||
1766 | /* If the endpoint is in the SHUTDOWN-ACK-SENT state and recognizes | |
1767 | * the peer has restarted (Action A), it MUST NOT setup a new | |
1768 | * association but instead resend the SHUTDOWN ACK and send an ERROR | |
1769 | * chunk with a "Cookie Received while Shutting Down" error cause to | |
1770 | * its peer. | |
1771 | */ | |
1772 | if (sctp_state(asoc, SHUTDOWN_ACK_SENT)) { | |
24cb81a6 | 1773 | disposition = sctp_sf_do_9_2_reshutack(net, ep, asoc, |
1da177e4 LT |
1774 | SCTP_ST_CHUNK(chunk->chunk_hdr->type), |
1775 | chunk, commands); | |
1776 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
1777 | goto nomem; | |
1778 | ||
1779 | err = sctp_make_op_error(asoc, chunk, | |
1780 | SCTP_ERROR_COOKIE_IN_SHUTDOWN, | |
6383cfb3 | 1781 | NULL, 0, 0); |
1da177e4 LT |
1782 | if (err) |
1783 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1784 | SCTP_CHUNK(err)); | |
1785 | ||
1786 | return SCTP_DISPOSITION_CONSUME; | |
1787 | } | |
1788 | ||
a000c01e WY |
1789 | /* For now, stop pending T3-rtx and SACK timers, fail any unsent/unacked |
1790 | * data. Consider the optional choice of resending of this data. | |
1da177e4 | 1791 | */ |
a000c01e WY |
1792 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); |
1793 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1794 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 LT |
1795 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_OUTQUEUE, SCTP_NULL()); |
1796 | ||
a000c01e WY |
1797 | /* Stop pending T4-rto timer, teardown ASCONF queue, ASCONF-ACK queue |
1798 | * and ASCONF-ACK cache. | |
1799 | */ | |
1800 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1801 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
1802 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_ASCONF_QUEUE, SCTP_NULL()); | |
1803 | ||
1da177e4 LT |
1804 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
1805 | if (!repl) | |
1806 | goto nomem; | |
1807 | ||
1da177e4 LT |
1808 | /* Report association restart to upper layer. */ |
1809 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_RESTART, 0, | |
1810 | new_asoc->c.sinit_num_ostreams, | |
1811 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 1812 | NULL, GFP_ATOMIC); |
1da177e4 LT |
1813 | if (!ev) |
1814 | goto nomem_ev; | |
1815 | ||
df7deeb5 VY |
1816 | /* Update the content of current association. */ |
1817 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); | |
1da177e4 | 1818 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
bdf6fa52 VY |
1819 | if (sctp_state(asoc, SHUTDOWN_PENDING) && |
1820 | (sctp_sstate(asoc->base.sk, CLOSING) || | |
1821 | sock_flag(asoc->base.sk, SOCK_DEAD))) { | |
1822 | /* if were currently in SHUTDOWN_PENDING, but the socket | |
1823 | * has been closed by user, don't transition to ESTABLISHED. | |
1824 | * Instead trigger SHUTDOWN bundled with COOKIE_ACK. | |
1825 | */ | |
1826 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1827 | return sctp_sf_do_9_2_start_shutdown(net, ep, asoc, | |
1828 | SCTP_ST_CHUNK(0), NULL, | |
1829 | commands); | |
1830 | } else { | |
1831 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1832 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
1833 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1834 | } | |
1da177e4 LT |
1835 | return SCTP_DISPOSITION_CONSUME; |
1836 | ||
1837 | nomem_ev: | |
1838 | sctp_chunk_free(repl); | |
1839 | nomem: | |
1840 | return SCTP_DISPOSITION_NOMEM; | |
1841 | } | |
1842 | ||
1843 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'B') | |
1844 | * | |
1845 | * Section 5.2.4 | |
1846 | * B) In this case, both sides may be attempting to start an association | |
1847 | * at about the same time but the peer endpoint started its INIT | |
1848 | * after responding to the local endpoint's INIT | |
1849 | */ | |
1850 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1851 | static enum sctp_disposition sctp_sf_do_dupcook_b( |
1852 | struct net *net, | |
24cb81a6 | 1853 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1854 | const struct sctp_association *asoc, |
1855 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1856 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1857 | struct sctp_association *new_asoc) |
1858 | { | |
01a992be | 1859 | struct sctp_init_chunk *peer_init; |
1da177e4 LT |
1860 | struct sctp_chunk *repl; |
1861 | ||
1862 | /* new_asoc is a brand-new association, so these are not yet | |
1863 | * side effects--it is safe to run them here. | |
1864 | */ | |
1865 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
de6becdc | 1866 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1867 | GFP_ATOMIC)) |
1868 | goto nomem; | |
1869 | ||
1870 | /* Update the content of current association. */ | |
1871 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); | |
1872 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1873 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 1874 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
1875 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
1876 | ||
1877 | repl = sctp_make_cookie_ack(new_asoc, chunk); | |
1878 | if (!repl) | |
1879 | goto nomem; | |
1880 | ||
1881 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1da177e4 LT |
1882 | |
1883 | /* RFC 2960 5.1 Normal Establishment of an Association | |
1884 | * | |
1885 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
1886 | * send the Communication Up notification to the SCTP user | |
1887 | * upon reception of a valid COOKIE ECHO chunk. | |
07d93967 VY |
1888 | * |
1889 | * Sadly, this needs to be implemented as a side-effect, because | |
1890 | * we are not guaranteed to have set the association id of the real | |
1891 | * association and so these notifications need to be delayed until | |
1892 | * the association id is allocated. | |
1da177e4 | 1893 | */ |
1da177e4 | 1894 | |
07d93967 | 1895 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_CHANGE, SCTP_U8(SCTP_COMM_UP)); |
1da177e4 LT |
1896 | |
1897 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 1898 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 1899 | * delivers this notification to inform the application that of the |
0f3fffd8 | 1900 | * peers requested adaptation layer. |
07d93967 VY |
1901 | * |
1902 | * This also needs to be done as a side effect for the same reason as | |
1903 | * above. | |
1da177e4 | 1904 | */ |
07d93967 VY |
1905 | if (asoc->peer.adaptation_ind) |
1906 | sctp_add_cmd_sf(commands, SCTP_CMD_ADAPTATION_IND, SCTP_NULL()); | |
1da177e4 LT |
1907 | |
1908 | return SCTP_DISPOSITION_CONSUME; | |
1909 | ||
1da177e4 LT |
1910 | nomem: |
1911 | return SCTP_DISPOSITION_NOMEM; | |
1912 | } | |
1913 | ||
1914 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'C') | |
1915 | * | |
1916 | * Section 5.2.4 | |
1917 | * C) In this case, the local endpoint's cookie has arrived late. | |
1918 | * Before it arrived, the local endpoint sent an INIT and received an | |
1919 | * INIT-ACK and finally sent a COOKIE ECHO with the peer's same tag | |
1920 | * but a new tag of its own. | |
1921 | */ | |
1922 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1923 | static enum sctp_disposition sctp_sf_do_dupcook_c( |
1924 | struct net *net, | |
24cb81a6 | 1925 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1926 | const struct sctp_association *asoc, |
1927 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1928 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1929 | struct sctp_association *new_asoc) |
1930 | { | |
1931 | /* The cookie should be silently discarded. | |
1932 | * The endpoint SHOULD NOT change states and should leave | |
1933 | * any timers running. | |
1934 | */ | |
1935 | return SCTP_DISPOSITION_DISCARD; | |
1936 | } | |
1937 | ||
1938 | /* Unexpected COOKIE-ECHO handler lost chunk (Table 2, action 'D') | |
1939 | * | |
1940 | * Section 5.2.4 | |
1941 | * | |
1942 | * D) When both local and remote tags match the endpoint should always | |
1943 | * enter the ESTABLISHED state, if it has not already done so. | |
1944 | */ | |
1945 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1946 | static enum sctp_disposition sctp_sf_do_dupcook_d( |
1947 | struct net *net, | |
24cb81a6 | 1948 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1949 | const struct sctp_association *asoc, |
1950 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1951 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1952 | struct sctp_association *new_asoc) |
1953 | { | |
df7deeb5 | 1954 | struct sctp_ulpevent *ev = NULL, *ai_ev = NULL; |
1da177e4 LT |
1955 | struct sctp_chunk *repl; |
1956 | ||
1957 | /* Clarification from Implementor's Guide: | |
1958 | * D) When both local and remote tags match the endpoint should | |
d808ad9a YH |
1959 | * enter the ESTABLISHED state, if it is in the COOKIE-ECHOED state. |
1960 | * It should stop any cookie timer that may be running and send | |
1961 | * a COOKIE ACK. | |
1da177e4 LT |
1962 | */ |
1963 | ||
1964 | /* Don't accidentally move back into established state. */ | |
1965 | if (asoc->state < SCTP_STATE_ESTABLISHED) { | |
1966 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1967 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
1968 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1969 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 1970 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
1971 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, |
1972 | SCTP_NULL()); | |
1973 | ||
1974 | /* RFC 2960 5.1 Normal Establishment of an Association | |
1975 | * | |
1976 | * D) IMPLEMENTATION NOTE: An implementation may choose | |
1977 | * to send the Communication Up notification to the | |
1978 | * SCTP user upon reception of a valid COOKIE | |
1979 | * ECHO chunk. | |
1980 | */ | |
df7deeb5 | 1981 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, |
1da177e4 | 1982 | SCTP_COMM_UP, 0, |
df7deeb5 VY |
1983 | asoc->c.sinit_num_ostreams, |
1984 | asoc->c.sinit_max_instreams, | |
9cbcbf4e | 1985 | NULL, GFP_ATOMIC); |
1da177e4 LT |
1986 | if (!ev) |
1987 | goto nomem; | |
1da177e4 LT |
1988 | |
1989 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 1990 | * When a peer sends a Adaptation Layer Indication parameter, |
1da177e4 | 1991 | * SCTP delivers this notification to inform the application |
0f3fffd8 | 1992 | * that of the peers requested adaptation layer. |
1da177e4 | 1993 | */ |
0f3fffd8 ISJ |
1994 | if (asoc->peer.adaptation_ind) { |
1995 | ai_ev = sctp_ulpevent_make_adaptation_indication(asoc, | |
1da177e4 | 1996 | GFP_ATOMIC); |
df7deeb5 | 1997 | if (!ai_ev) |
1da177e4 LT |
1998 | goto nomem; |
1999 | ||
1da177e4 LT |
2000 | } |
2001 | } | |
1da177e4 LT |
2002 | |
2003 | repl = sctp_make_cookie_ack(new_asoc, chunk); | |
2004 | if (!repl) | |
2005 | goto nomem; | |
2006 | ||
2e3216cd VY |
2007 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
2008 | ||
df7deeb5 VY |
2009 | if (ev) |
2010 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2011 | SCTP_ULPEVENT(ev)); | |
2012 | if (ai_ev) | |
2013 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2014 | SCTP_ULPEVENT(ai_ev)); | |
2015 | ||
1da177e4 LT |
2016 | return SCTP_DISPOSITION_CONSUME; |
2017 | ||
2018 | nomem: | |
df7deeb5 VY |
2019 | if (ai_ev) |
2020 | sctp_ulpevent_free(ai_ev); | |
1da177e4 LT |
2021 | if (ev) |
2022 | sctp_ulpevent_free(ev); | |
2023 | return SCTP_DISPOSITION_NOMEM; | |
2024 | } | |
2025 | ||
2026 | /* | |
2027 | * Handle a duplicate COOKIE-ECHO. This usually means a cookie-carrying | |
2028 | * chunk was retransmitted and then delayed in the network. | |
2029 | * | |
2030 | * Section: 5.2.4 Handle a COOKIE ECHO when a TCB exists | |
2031 | * | |
2032 | * Verification Tag: None. Do cookie validation. | |
2033 | * | |
2034 | * Inputs | |
2035 | * (endpoint, asoc, chunk) | |
2036 | * | |
2037 | * Outputs | |
2038 | * (asoc, reply_msg, msg_up, timers, counters) | |
2039 | * | |
2040 | * The return value is the disposition of the chunk. | |
2041 | */ | |
172a1599 XL |
2042 | enum sctp_disposition sctp_sf_do_5_2_4_dupcook( |
2043 | struct net *net, | |
24cb81a6 | 2044 | const struct sctp_endpoint *ep, |
1da177e4 | 2045 | const struct sctp_association *asoc, |
bfc6f827 | 2046 | const union sctp_subtype type, |
1da177e4 | 2047 | void *arg, |
a85bbeb2 | 2048 | struct sctp_cmd_seq *commands) |
1da177e4 | 2049 | { |
1da177e4 | 2050 | struct sctp_association *new_asoc; |
172a1599 XL |
2051 | struct sctp_chunk *chunk = arg; |
2052 | enum sctp_disposition retval; | |
2053 | struct sctp_chunk *err_chk_p; | |
1da177e4 LT |
2054 | int error = 0; |
2055 | char action; | |
1da177e4 LT |
2056 | |
2057 | /* Make sure that the chunk has a valid length from the protocol | |
2058 | * perspective. In this case check to make sure we have at least | |
2059 | * enough for the chunk header. Cookie length verification is | |
2060 | * done later. | |
2061 | */ | |
922dbc5b | 2062 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2063 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2064 | commands); |
2065 | ||
2066 | /* "Decode" the chunk. We have no optional parameters so we | |
2067 | * are in good shape. | |
2068 | */ | |
d808ad9a | 2069 | chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 2070 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 2071 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 2072 | goto nomem; |
1da177e4 LT |
2073 | |
2074 | /* In RFC 2960 5.2.4 3, if both Verification Tags in the State Cookie | |
2075 | * of a duplicate COOKIE ECHO match the Verification Tags of the | |
2076 | * current association, consider the State Cookie valid even if | |
2077 | * the lifespan is exceeded. | |
2078 | */ | |
2079 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
2080 | &err_chk_p); | |
2081 | ||
2082 | /* FIXME: | |
2083 | * If the re-build failed, what is the proper error path | |
2084 | * from here? | |
2085 | * | |
2086 | * [We should abort the association. --piggy] | |
2087 | */ | |
2088 | if (!new_asoc) { | |
2089 | /* FIXME: Several errors are possible. A bad cookie should | |
2090 | * be silently discarded, but think about logging it too. | |
2091 | */ | |
2092 | switch (error) { | |
2093 | case -SCTP_IERROR_NOMEM: | |
2094 | goto nomem; | |
2095 | ||
2096 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 2097 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 2098 | err_chk_p); |
24cb81a6 | 2099 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2100 | case -SCTP_IERROR_BAD_SIG: |
2101 | default: | |
24cb81a6 | 2102 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 2103 | } |
1da177e4 LT |
2104 | } |
2105 | ||
7e062977 XL |
2106 | /* Set temp so that it won't be added into hashtable */ |
2107 | new_asoc->temp = 1; | |
2108 | ||
1da177e4 LT |
2109 | /* Compare the tie_tag in cookie with the verification tag of |
2110 | * current association. | |
2111 | */ | |
2112 | action = sctp_tietags_compare(new_asoc, asoc); | |
2113 | ||
2114 | switch (action) { | |
2115 | case 'A': /* Association restart. */ | |
24cb81a6 | 2116 | retval = sctp_sf_do_dupcook_a(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2117 | new_asoc); |
2118 | break; | |
2119 | ||
2120 | case 'B': /* Collision case B. */ | |
24cb81a6 | 2121 | retval = sctp_sf_do_dupcook_b(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2122 | new_asoc); |
2123 | break; | |
2124 | ||
2125 | case 'C': /* Collision case C. */ | |
24cb81a6 | 2126 | retval = sctp_sf_do_dupcook_c(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2127 | new_asoc); |
2128 | break; | |
2129 | ||
2130 | case 'D': /* Collision case D. */ | |
24cb81a6 | 2131 | retval = sctp_sf_do_dupcook_d(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2132 | new_asoc); |
2133 | break; | |
2134 | ||
2135 | default: /* Discard packet for all others. */ | |
24cb81a6 | 2136 | retval = sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2137 | break; |
3ff50b79 | 2138 | } |
1da177e4 LT |
2139 | |
2140 | /* Delete the tempory new association. */ | |
f2815633 | 2141 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, SCTP_ASOC(new_asoc)); |
1da177e4 LT |
2142 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
2143 | ||
d5ccd496 MM |
2144 | /* Restore association pointer to provide SCTP command interpeter |
2145 | * with a valid context in case it needs to manipulate | |
2146 | * the queues */ | |
2147 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, | |
2148 | SCTP_ASOC((struct sctp_association *)asoc)); | |
2149 | ||
1da177e4 LT |
2150 | return retval; |
2151 | ||
2152 | nomem: | |
2153 | return SCTP_DISPOSITION_NOMEM; | |
2154 | } | |
2155 | ||
2156 | /* | |
2157 | * Process an ABORT. (SHUTDOWN-PENDING state) | |
2158 | * | |
2159 | * See sctp_sf_do_9_1_abort(). | |
2160 | */ | |
172a1599 XL |
2161 | enum sctp_disposition sctp_sf_shutdown_pending_abort( |
2162 | struct net *net, | |
2163 | const struct sctp_endpoint *ep, | |
2164 | const struct sctp_association *asoc, | |
2165 | const union sctp_subtype type, | |
2166 | void *arg, | |
2167 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2168 | { |
2169 | struct sctp_chunk *chunk = arg; | |
2170 | ||
2171 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2172 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2173 | |
2174 | /* Make sure that the ABORT chunk has a valid length. | |
2175 | * Since this is an ABORT chunk, we have to discard it | |
2176 | * because of the following text: | |
2177 | * RFC 2960, Section 3.3.7 | |
2178 | * If an endpoint receives an ABORT with a format error or for an | |
2179 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2180 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2181 | * as we do not know its true length. So, to be safe, discard the |
2182 | * packet. | |
2183 | */ | |
441ae65a | 2184 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2185 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2186 | |
75205f47 VY |
2187 | /* ADD-IP: Special case for ABORT chunks |
2188 | * F4) One special consideration is that ABORT Chunks arriving | |
2189 | * destined to the IP address being deleted MUST be | |
2190 | * ignored (see Section 5.3.1 for further details). | |
2191 | */ | |
2192 | if (SCTP_ADDR_DEL == | |
2193 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2194 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2195 | |
24cb81a6 | 2196 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2197 | } |
2198 | ||
2199 | /* | |
2200 | * Process an ABORT. (SHUTDOWN-SENT state) | |
2201 | * | |
2202 | * See sctp_sf_do_9_1_abort(). | |
2203 | */ | |
172a1599 XL |
2204 | enum sctp_disposition sctp_sf_shutdown_sent_abort( |
2205 | struct net *net, | |
24cb81a6 | 2206 | const struct sctp_endpoint *ep, |
1da177e4 | 2207 | const struct sctp_association *asoc, |
bfc6f827 | 2208 | const union sctp_subtype type, |
1da177e4 | 2209 | void *arg, |
a85bbeb2 | 2210 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2211 | { |
2212 | struct sctp_chunk *chunk = arg; | |
2213 | ||
2214 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2215 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2216 | |
2217 | /* Make sure that the ABORT chunk has a valid length. | |
2218 | * Since this is an ABORT chunk, we have to discard it | |
2219 | * because of the following text: | |
2220 | * RFC 2960, Section 3.3.7 | |
2221 | * If an endpoint receives an ABORT with a format error or for an | |
2222 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2223 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2224 | * as we do not know its true length. So, to be safe, discard the |
2225 | * packet. | |
2226 | */ | |
441ae65a | 2227 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2228 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2229 | |
75205f47 VY |
2230 | /* ADD-IP: Special case for ABORT chunks |
2231 | * F4) One special consideration is that ABORT Chunks arriving | |
2232 | * destined to the IP address being deleted MUST be | |
2233 | * ignored (see Section 5.3.1 for further details). | |
2234 | */ | |
2235 | if (SCTP_ADDR_DEL == | |
2236 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2237 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2238 | |
1da177e4 LT |
2239 | /* Stop the T2-shutdown timer. */ |
2240 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2241 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2242 | ||
2243 | /* Stop the T5-shutdown guard timer. */ | |
2244 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2245 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
2246 | ||
24cb81a6 | 2247 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2248 | } |
2249 | ||
2250 | /* | |
2251 | * Process an ABORT. (SHUTDOWN-ACK-SENT state) | |
2252 | * | |
2253 | * See sctp_sf_do_9_1_abort(). | |
2254 | */ | |
172a1599 XL |
2255 | enum sctp_disposition sctp_sf_shutdown_ack_sent_abort( |
2256 | struct net *net, | |
2257 | const struct sctp_endpoint *ep, | |
2258 | const struct sctp_association *asoc, | |
2259 | const union sctp_subtype type, | |
2260 | void *arg, | |
2261 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2262 | { |
2263 | /* The same T2 timer, so we should be able to use | |
2264 | * common function with the SHUTDOWN-SENT state. | |
2265 | */ | |
24cb81a6 | 2266 | return sctp_sf_shutdown_sent_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2267 | } |
2268 | ||
2269 | /* | |
2270 | * Handle an Error received in COOKIE_ECHOED state. | |
2271 | * | |
2272 | * Only handle the error type of stale COOKIE Error, the other errors will | |
2273 | * be ignored. | |
2274 | * | |
2275 | * Inputs | |
2276 | * (endpoint, asoc, chunk) | |
2277 | * | |
2278 | * Outputs | |
2279 | * (asoc, reply_msg, msg_up, timers, counters) | |
2280 | * | |
2281 | * The return value is the disposition of the chunk. | |
2282 | */ | |
172a1599 XL |
2283 | enum sctp_disposition sctp_sf_cookie_echoed_err( |
2284 | struct net *net, | |
24cb81a6 | 2285 | const struct sctp_endpoint *ep, |
1da177e4 | 2286 | const struct sctp_association *asoc, |
bfc6f827 | 2287 | const union sctp_subtype type, |
1da177e4 | 2288 | void *arg, |
a85bbeb2 | 2289 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2290 | { |
2291 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 2292 | struct sctp_errhdr *err; |
1da177e4 LT |
2293 | |
2294 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2295 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2296 | |
2297 | /* Make sure that the ERROR chunk has a valid length. | |
2298 | * The parameter walking depends on this as well. | |
2299 | */ | |
87caeba7 | 2300 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 2301 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2302 | commands); |
2303 | ||
2304 | /* Process the error here */ | |
2305 | /* FUTURE FIXME: When PR-SCTP related and other optional | |
2306 | * parms are emitted, this will have to change to handle multiple | |
2307 | * errors. | |
2308 | */ | |
2309 | sctp_walk_errors(err, chunk->chunk_hdr) { | |
2310 | if (SCTP_ERROR_STALE_COOKIE == err->cause) | |
24cb81a6 | 2311 | return sctp_sf_do_5_2_6_stale(net, ep, asoc, type, |
1da177e4 LT |
2312 | arg, commands); |
2313 | } | |
2314 | ||
2315 | /* It is possible to have malformed error causes, and that | |
2316 | * will cause us to end the walk early. However, since | |
2317 | * we are discarding the packet, there should be no adverse | |
2318 | * affects. | |
2319 | */ | |
24cb81a6 | 2320 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2321 | } |
2322 | ||
2323 | /* | |
2324 | * Handle a Stale COOKIE Error | |
2325 | * | |
2326 | * Section: 5.2.6 Handle Stale COOKIE Error | |
2327 | * If the association is in the COOKIE-ECHOED state, the endpoint may elect | |
2328 | * one of the following three alternatives. | |
2329 | * ... | |
2330 | * 3) Send a new INIT chunk to the endpoint, adding a Cookie | |
2331 | * Preservative parameter requesting an extension to the lifetime of | |
2332 | * the State Cookie. When calculating the time extension, an | |
2333 | * implementation SHOULD use the RTT information measured based on the | |
2334 | * previous COOKIE ECHO / ERROR exchange, and should add no more | |
2335 | * than 1 second beyond the measured RTT, due to long State Cookie | |
2336 | * lifetimes making the endpoint more subject to a replay attack. | |
2337 | * | |
2338 | * Verification Tag: Not explicit, but safe to ignore. | |
2339 | * | |
2340 | * Inputs | |
2341 | * (endpoint, asoc, chunk) | |
2342 | * | |
2343 | * Outputs | |
2344 | * (asoc, reply_msg, msg_up, timers, counters) | |
2345 | * | |
2346 | * The return value is the disposition of the chunk. | |
2347 | */ | |
172a1599 XL |
2348 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
2349 | struct net *net, | |
2350 | const struct sctp_endpoint *ep, | |
2351 | const struct sctp_association *asoc, | |
2352 | const union sctp_subtype type, | |
2353 | void *arg, | |
2354 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2355 | { |
3f7a87d2 | 2356 | int attempts = asoc->init_err_counter + 1; |
365ddb65 XL |
2357 | struct sctp_chunk *chunk = arg, *reply; |
2358 | struct sctp_cookie_preserve_param bht; | |
2359 | struct sctp_bind_addr *bp; | |
d8238d9d | 2360 | struct sctp_errhdr *err; |
365ddb65 | 2361 | u32 stale; |
1da177e4 | 2362 | |
81845c21 | 2363 | if (attempts > asoc->max_init_attempts) { |
8de8c873 SS |
2364 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
2365 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 2366 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 2367 | SCTP_PERR(SCTP_ERROR_STALE_COOKIE)); |
1da177e4 LT |
2368 | return SCTP_DISPOSITION_DELETE_TCB; |
2369 | } | |
2370 | ||
d8238d9d | 2371 | err = (struct sctp_errhdr *)(chunk->skb->data); |
1da177e4 LT |
2372 | |
2373 | /* When calculating the time extension, an implementation | |
2374 | * SHOULD use the RTT information measured based on the | |
2375 | * previous COOKIE ECHO / ERROR exchange, and should add no | |
2376 | * more than 1 second beyond the measured RTT, due to long | |
2377 | * State Cookie lifetimes making the endpoint more subject to | |
2378 | * a replay attack. | |
2379 | * Measure of Staleness's unit is usec. (1/1000000 sec) | |
2380 | * Suggested Cookie Life-span Increment's unit is msec. | |
2381 | * (1/1000 sec) | |
2382 | * In general, if you use the suggested cookie life, the value | |
2383 | * found in the field of measure of staleness should be doubled | |
2384 | * to give ample time to retransmit the new cookie and thus | |
2385 | * yield a higher probability of success on the reattempt. | |
2386 | */ | |
d8238d9d | 2387 | stale = ntohl(*(__be32 *)((u8 *)err + sizeof(*err))); |
1da177e4 LT |
2388 | stale = (stale * 2) / 1000; |
2389 | ||
2390 | bht.param_hdr.type = SCTP_PARAM_COOKIE_PRESERVATIVE; | |
2391 | bht.param_hdr.length = htons(sizeof(bht)); | |
2392 | bht.lifespan_increment = htonl(stale); | |
2393 | ||
2394 | /* Build that new INIT chunk. */ | |
2395 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; | |
2396 | reply = sctp_make_init(asoc, bp, GFP_ATOMIC, sizeof(bht)); | |
2397 | if (!reply) | |
2398 | goto nomem; | |
2399 | ||
2400 | sctp_addto_chunk(reply, sizeof(bht), &bht); | |
2401 | ||
2402 | /* Clear peer's init_tag cached in assoc as we are sending a new INIT */ | |
2403 | sctp_add_cmd_sf(commands, SCTP_CMD_CLEAR_INIT_TAG, SCTP_NULL()); | |
2404 | ||
2405 | /* Stop pending T3-rtx and heartbeat timers */ | |
2406 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); | |
2407 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
2408 | ||
2409 | /* Delete non-primary peer ip addresses since we are transitioning | |
2410 | * back to the COOKIE-WAIT state | |
2411 | */ | |
2412 | sctp_add_cmd_sf(commands, SCTP_CMD_DEL_NON_PRIMARY, SCTP_NULL()); | |
2413 | ||
d808ad9a YH |
2414 | /* If we've sent any data bundled with COOKIE-ECHO we will need to |
2415 | * resend | |
1da177e4 | 2416 | */ |
b6157d8e | 2417 | sctp_add_cmd_sf(commands, SCTP_CMD_T1_RETRAN, |
1da177e4 LT |
2418 | SCTP_TRANSPORT(asoc->peer.primary_path)); |
2419 | ||
2420 | /* Cast away the const modifier, as we want to just | |
2421 | * rerun it through as a sideffect. | |
2422 | */ | |
3f7a87d2 | 2423 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_INC, SCTP_NULL()); |
1da177e4 LT |
2424 | |
2425 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2426 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2427 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2428 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
2429 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
2430 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
2431 | ||
2432 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2433 | ||
2434 | return SCTP_DISPOSITION_CONSUME; | |
2435 | ||
2436 | nomem: | |
2437 | return SCTP_DISPOSITION_NOMEM; | |
2438 | } | |
2439 | ||
2440 | /* | |
2441 | * Process an ABORT. | |
2442 | * | |
2443 | * Section: 9.1 | |
2444 | * After checking the Verification Tag, the receiving endpoint shall | |
2445 | * remove the association from its record, and shall report the | |
2446 | * termination to its upper layer. | |
2447 | * | |
2448 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
2449 | * B) Rules for packet carrying ABORT: | |
2450 | * | |
2451 | * - The endpoint shall always fill in the Verification Tag field of the | |
2452 | * outbound packet with the destination endpoint's tag value if it | |
2453 | * is known. | |
2454 | * | |
2455 | * - If the ABORT is sent in response to an OOTB packet, the endpoint | |
2456 | * MUST follow the procedure described in Section 8.4. | |
2457 | * | |
2458 | * - The receiver MUST accept the packet if the Verification Tag | |
2459 | * matches either its own tag, OR the tag of its peer. Otherwise, the | |
2460 | * receiver MUST silently discard the packet and take no further | |
2461 | * action. | |
2462 | * | |
2463 | * Inputs | |
2464 | * (endpoint, asoc, chunk) | |
2465 | * | |
2466 | * Outputs | |
2467 | * (asoc, reply_msg, msg_up, timers, counters) | |
2468 | * | |
2469 | * The return value is the disposition of the chunk. | |
2470 | */ | |
172a1599 XL |
2471 | enum sctp_disposition sctp_sf_do_9_1_abort( |
2472 | struct net *net, | |
24cb81a6 | 2473 | const struct sctp_endpoint *ep, |
1da177e4 | 2474 | const struct sctp_association *asoc, |
bfc6f827 | 2475 | const union sctp_subtype type, |
1da177e4 | 2476 | void *arg, |
a85bbeb2 | 2477 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2478 | { |
2479 | struct sctp_chunk *chunk = arg; | |
1da177e4 LT |
2480 | |
2481 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2482 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2483 | |
2484 | /* Make sure that the ABORT chunk has a valid length. | |
2485 | * Since this is an ABORT chunk, we have to discard it | |
2486 | * because of the following text: | |
2487 | * RFC 2960, Section 3.3.7 | |
2488 | * If an endpoint receives an ABORT with a format error or for an | |
2489 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2490 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2491 | * as we do not know its true length. So, to be safe, discard the |
2492 | * packet. | |
2493 | */ | |
441ae65a | 2494 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2495 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2496 | |
75205f47 VY |
2497 | /* ADD-IP: Special case for ABORT chunks |
2498 | * F4) One special consideration is that ABORT Chunks arriving | |
2499 | * destined to the IP address being deleted MUST be | |
2500 | * ignored (see Section 5.3.1 for further details). | |
2501 | */ | |
2502 | if (SCTP_ADDR_DEL == | |
2503 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2504 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2505 | |
24cb81a6 | 2506 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
75205f47 VY |
2507 | } |
2508 | ||
172a1599 XL |
2509 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
2510 | struct net *net, | |
24cb81a6 | 2511 | const struct sctp_endpoint *ep, |
75205f47 | 2512 | const struct sctp_association *asoc, |
bfc6f827 | 2513 | const union sctp_subtype type, |
75205f47 | 2514 | void *arg, |
a85bbeb2 | 2515 | struct sctp_cmd_seq *commands) |
75205f47 | 2516 | { |
172a1599 | 2517 | __be16 error = SCTP_ERROR_NO_ERROR; |
75205f47 | 2518 | struct sctp_chunk *chunk = arg; |
95c96174 | 2519 | unsigned int len; |
75205f47 | 2520 | |
1da177e4 LT |
2521 | /* See if we have an error cause code in the chunk. */ |
2522 | len = ntohs(chunk->chunk_hdr->length); | |
96ca468b | 2523 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) { |
d8238d9d | 2524 | struct sctp_errhdr *err; |
96ca468b | 2525 | |
96ca468b SW |
2526 | sctp_walk_errors(err, chunk->chunk_hdr); |
2527 | if ((void *)err != (void *)chunk->chunk_end) | |
d8238d9d XL |
2528 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
2529 | commands); | |
96ca468b | 2530 | |
d8238d9d | 2531 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
96ca468b | 2532 | } |
1da177e4 | 2533 | |
8de8c873 | 2534 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNRESET)); |
d808ad9a | 2535 | /* ASSOC_FAILED will DELETE_TCB. */ |
5be291fe | 2536 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(error)); |
b01a2407 EB |
2537 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
2538 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
2539 | |
2540 | return SCTP_DISPOSITION_ABORT; | |
2541 | } | |
2542 | ||
2543 | /* | |
2544 | * Process an ABORT. (COOKIE-WAIT state) | |
2545 | * | |
2546 | * See sctp_sf_do_9_1_abort() above. | |
2547 | */ | |
172a1599 XL |
2548 | enum sctp_disposition sctp_sf_cookie_wait_abort( |
2549 | struct net *net, | |
2550 | const struct sctp_endpoint *ep, | |
2551 | const struct sctp_association *asoc, | |
2552 | const union sctp_subtype type, | |
2553 | void *arg, | |
2554 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2555 | { |
172a1599 | 2556 | __be16 error = SCTP_ERROR_NO_ERROR; |
1da177e4 | 2557 | struct sctp_chunk *chunk = arg; |
95c96174 | 2558 | unsigned int len; |
1da177e4 LT |
2559 | |
2560 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2561 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2562 | |
2563 | /* Make sure that the ABORT chunk has a valid length. | |
2564 | * Since this is an ABORT chunk, we have to discard it | |
2565 | * because of the following text: | |
2566 | * RFC 2960, Section 3.3.7 | |
2567 | * If an endpoint receives an ABORT with a format error or for an | |
2568 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2569 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2570 | * as we do not know its true length. So, to be safe, discard the |
2571 | * packet. | |
2572 | */ | |
441ae65a | 2573 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2574 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2575 | |
2576 | /* See if we have an error cause code in the chunk. */ | |
2577 | len = ntohs(chunk->chunk_hdr->length); | |
2578 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) | |
d8238d9d | 2579 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
1da177e4 | 2580 | |
24cb81a6 | 2581 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, asoc, |
8de8c873 | 2582 | chunk->transport); |
1da177e4 LT |
2583 | } |
2584 | ||
2585 | /* | |
2586 | * Process an incoming ICMP as an ABORT. (COOKIE-WAIT state) | |
2587 | */ | |
172a1599 XL |
2588 | enum sctp_disposition sctp_sf_cookie_wait_icmp_abort( |
2589 | struct net *net, | |
24cb81a6 | 2590 | const struct sctp_endpoint *ep, |
1da177e4 | 2591 | const struct sctp_association *asoc, |
bfc6f827 | 2592 | const union sctp_subtype type, |
1da177e4 | 2593 | void *arg, |
a85bbeb2 | 2594 | struct sctp_cmd_seq *commands) |
1da177e4 | 2595 | { |
24cb81a6 | 2596 | return sctp_stop_t1_and_abort(net, commands, SCTP_ERROR_NO_ERROR, |
8de8c873 | 2597 | ENOPROTOOPT, asoc, |
3f7a87d2 | 2598 | (struct sctp_transport *)arg); |
1da177e4 LT |
2599 | } |
2600 | ||
2601 | /* | |
2602 | * Process an ABORT. (COOKIE-ECHOED state) | |
2603 | */ | |
172a1599 XL |
2604 | enum sctp_disposition sctp_sf_cookie_echoed_abort( |
2605 | struct net *net, | |
2606 | const struct sctp_endpoint *ep, | |
2607 | const struct sctp_association *asoc, | |
2608 | const union sctp_subtype type, | |
2609 | void *arg, | |
2610 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2611 | { |
2612 | /* There is a single T1 timer, so we should be able to use | |
2613 | * common function with the COOKIE-WAIT state. | |
2614 | */ | |
24cb81a6 | 2615 | return sctp_sf_cookie_wait_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2616 | } |
2617 | ||
2618 | /* | |
2619 | * Stop T1 timer and abort association with "INIT failed". | |
2620 | * | |
2621 | * This is common code called by several sctp_sf_*_abort() functions above. | |
2622 | */ | |
172a1599 XL |
2623 | static enum sctp_disposition sctp_stop_t1_and_abort( |
2624 | struct net *net, | |
2625 | struct sctp_cmd_seq *commands, | |
2626 | __be16 error, int sk_err, | |
2627 | const struct sctp_association *asoc, | |
2628 | struct sctp_transport *transport) | |
1da177e4 | 2629 | { |
bb33381d DB |
2630 | pr_debug("%s: ABORT received (INIT)\n", __func__); |
2631 | ||
1da177e4 LT |
2632 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
2633 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
24cb81a6 | 2634 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
2635 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
2636 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
8de8c873 | 2637 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(sk_err)); |
1da177e4 LT |
2638 | /* CMD_INIT_FAILED will DELETE_TCB. */ |
2639 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 2640 | SCTP_PERR(error)); |
bb33381d | 2641 | |
3f7a87d2 | 2642 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
2643 | } |
2644 | ||
2645 | /* | |
2646 | * sctp_sf_do_9_2_shut | |
2647 | * | |
2648 | * Section: 9.2 | |
2649 | * Upon the reception of the SHUTDOWN, the peer endpoint shall | |
2650 | * - enter the SHUTDOWN-RECEIVED state, | |
2651 | * | |
2652 | * - stop accepting new data from its SCTP user | |
2653 | * | |
2654 | * - verify, by checking the Cumulative TSN Ack field of the chunk, | |
2655 | * that all its outstanding DATA chunks have been received by the | |
2656 | * SHUTDOWN sender. | |
2657 | * | |
2658 | * Once an endpoint as reached the SHUTDOWN-RECEIVED state it MUST NOT | |
2659 | * send a SHUTDOWN in response to a ULP request. And should discard | |
2660 | * subsequent SHUTDOWN chunks. | |
2661 | * | |
2662 | * If there are still outstanding DATA chunks left, the SHUTDOWN | |
2663 | * receiver shall continue to follow normal data transmission | |
2664 | * procedures defined in Section 6 until all outstanding DATA chunks | |
2665 | * are acknowledged; however, the SHUTDOWN receiver MUST NOT accept | |
2666 | * new data from its SCTP user. | |
2667 | * | |
2668 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2669 | * | |
2670 | * Inputs | |
2671 | * (endpoint, asoc, chunk) | |
2672 | * | |
2673 | * Outputs | |
2674 | * (asoc, reply_msg, msg_up, timers, counters) | |
2675 | * | |
2676 | * The return value is the disposition of the chunk. | |
2677 | */ | |
172a1599 XL |
2678 | enum sctp_disposition sctp_sf_do_9_2_shutdown( |
2679 | struct net *net, | |
2680 | const struct sctp_endpoint *ep, | |
2681 | const struct sctp_association *asoc, | |
2682 | const union sctp_subtype type, | |
2683 | void *arg, | |
2684 | struct sctp_cmd_seq *commands) | |
2685 | { | |
2686 | enum sctp_disposition disposition; | |
1da177e4 | 2687 | struct sctp_chunk *chunk = arg; |
e61e4055 | 2688 | struct sctp_shutdownhdr *sdh; |
1da177e4 | 2689 | struct sctp_ulpevent *ev; |
df10eec4 | 2690 | __u32 ctsn; |
1da177e4 LT |
2691 | |
2692 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2693 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2694 | |
2695 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2696 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2697 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2698 | commands); |
2699 | ||
2700 | /* Convert the elaborate header. */ | |
e61e4055 XL |
2701 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
2702 | skb_pull(chunk->skb, sizeof(*sdh)); | |
1da177e4 | 2703 | chunk->subh.shutdown_hdr = sdh; |
df10eec4 WY |
2704 | ctsn = ntohl(sdh->cum_tsn_ack); |
2705 | ||
a2f36eec | 2706 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { |
bb33381d DB |
2707 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2708 | asoc->ctsn_ack_point); | |
2709 | ||
a2f36eec WY |
2710 | return SCTP_DISPOSITION_DISCARD; |
2711 | } | |
2712 | ||
df10eec4 WY |
2713 | /* If Cumulative TSN Ack beyond the max tsn currently |
2714 | * send, terminating the association and respond to the | |
2715 | * sender with an ABORT. | |
2716 | */ | |
2717 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 2718 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
1da177e4 | 2719 | |
eb0e0076 SS |
2720 | /* API 5.3.1.5 SCTP_SHUTDOWN_EVENT |
2721 | * When a peer sends a SHUTDOWN, SCTP delivers this notification to | |
2722 | * inform the application that it should cease sending data. | |
2723 | */ | |
2724 | ev = sctp_ulpevent_make_shutdown_event(asoc, 0, GFP_ATOMIC); | |
2725 | if (!ev) { | |
2726 | disposition = SCTP_DISPOSITION_NOMEM; | |
d808ad9a | 2727 | goto out; |
eb0e0076 SS |
2728 | } |
2729 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
2730 | ||
1da177e4 LT |
2731 | /* Upon the reception of the SHUTDOWN, the peer endpoint shall |
2732 | * - enter the SHUTDOWN-RECEIVED state, | |
2733 | * - stop accepting new data from its SCTP user | |
2734 | * | |
2735 | * [This is implicit in the new state.] | |
2736 | */ | |
2737 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2738 | SCTP_STATE(SCTP_STATE_SHUTDOWN_RECEIVED)); | |
2739 | disposition = SCTP_DISPOSITION_CONSUME; | |
2740 | ||
2741 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 2742 | disposition = sctp_sf_do_9_2_shutdown_ack(net, ep, asoc, type, |
1da177e4 LT |
2743 | arg, commands); |
2744 | } | |
2745 | ||
2746 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
2747 | goto out; | |
2748 | ||
2749 | /* - verify, by checking the Cumulative TSN Ack field of the | |
2750 | * chunk, that all its outstanding DATA chunks have been | |
2751 | * received by the SHUTDOWN sender. | |
2752 | */ | |
2753 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2178eda8 | 2754 | SCTP_BE32(chunk->subh.shutdown_hdr->cum_tsn_ack)); |
1da177e4 | 2755 | |
1da177e4 LT |
2756 | out: |
2757 | return disposition; | |
2758 | } | |
2759 | ||
2e3f92da WY |
2760 | /* |
2761 | * sctp_sf_do_9_2_shut_ctsn | |
2762 | * | |
2763 | * Once an endpoint has reached the SHUTDOWN-RECEIVED state, | |
2764 | * it MUST NOT send a SHUTDOWN in response to a ULP request. | |
2765 | * The Cumulative TSN Ack of the received SHUTDOWN chunk | |
2766 | * MUST be processed. | |
2767 | */ | |
172a1599 XL |
2768 | enum sctp_disposition sctp_sf_do_9_2_shut_ctsn( |
2769 | struct net *net, | |
2770 | const struct sctp_endpoint *ep, | |
2771 | const struct sctp_association *asoc, | |
2772 | const union sctp_subtype type, | |
2773 | void *arg, | |
2774 | struct sctp_cmd_seq *commands) | |
2e3f92da WY |
2775 | { |
2776 | struct sctp_chunk *chunk = arg; | |
e61e4055 | 2777 | struct sctp_shutdownhdr *sdh; |
a2f36eec | 2778 | __u32 ctsn; |
2e3f92da WY |
2779 | |
2780 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2781 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2782 | |
2783 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2784 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2785 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
2e3f92da WY |
2786 | commands); |
2787 | ||
e61e4055 | 2788 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
a2f36eec WY |
2789 | ctsn = ntohl(sdh->cum_tsn_ack); |
2790 | ||
2791 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
2792 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2793 | asoc->ctsn_ack_point); | |
2794 | ||
a2f36eec WY |
2795 | return SCTP_DISPOSITION_DISCARD; |
2796 | } | |
2e3f92da WY |
2797 | |
2798 | /* If Cumulative TSN Ack beyond the max tsn currently | |
2799 | * send, terminating the association and respond to the | |
2800 | * sender with an ABORT. | |
2801 | */ | |
a2f36eec | 2802 | if (!TSN_lt(ctsn, asoc->next_tsn)) |
24cb81a6 | 2803 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2804 | |
2805 | /* verify, by checking the Cumulative TSN Ack field of the | |
2806 | * chunk, that all its outstanding DATA chunks have been | |
2807 | * received by the SHUTDOWN sender. | |
2808 | */ | |
2809 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2810 | SCTP_BE32(sdh->cum_tsn_ack)); | |
2811 | ||
2812 | return SCTP_DISPOSITION_CONSUME; | |
2813 | } | |
2814 | ||
1da177e4 LT |
2815 | /* RFC 2960 9.2 |
2816 | * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk | |
2817 | * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination | |
2818 | * transport addresses (either in the IP addresses or in the INIT chunk) | |
2819 | * that belong to this association, it should discard the INIT chunk and | |
2820 | * retransmit the SHUTDOWN ACK chunk. | |
2821 | */ | |
172a1599 XL |
2822 | enum sctp_disposition sctp_sf_do_9_2_reshutack( |
2823 | struct net *net, | |
2824 | const struct sctp_endpoint *ep, | |
2825 | const struct sctp_association *asoc, | |
2826 | const union sctp_subtype type, | |
2827 | void *arg, | |
2828 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2829 | { |
172a1599 | 2830 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
2831 | struct sctp_chunk *reply; |
2832 | ||
ece25dfa | 2833 | /* Make sure that the chunk has a valid length */ |
922dbc5b | 2834 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2835 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
2836 | commands); |
2837 | ||
1da177e4 LT |
2838 | /* Since we are not going to really process this INIT, there |
2839 | * is no point in verifying chunk boundries. Just generate | |
2840 | * the SHUTDOWN ACK. | |
2841 | */ | |
2842 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
2843 | if (NULL == reply) | |
2844 | goto nomem; | |
2845 | ||
2846 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
2847 | * the T2-SHUTDOWN timer. | |
2848 | */ | |
2849 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
2850 | ||
2851 | /* and restart the T2-shutdown timer. */ | |
2852 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
2853 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2854 | ||
2855 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2856 | ||
2857 | return SCTP_DISPOSITION_CONSUME; | |
2858 | nomem: | |
2859 | return SCTP_DISPOSITION_NOMEM; | |
2860 | } | |
2861 | ||
2862 | /* | |
2863 | * sctp_sf_do_ecn_cwr | |
2864 | * | |
2865 | * Section: Appendix A: Explicit Congestion Notification | |
2866 | * | |
2867 | * CWR: | |
2868 | * | |
2869 | * RFC 2481 details a specific bit for a sender to send in the header of | |
2870 | * its next outbound TCP segment to indicate to its peer that it has | |
2871 | * reduced its congestion window. This is termed the CWR bit. For | |
2872 | * SCTP the same indication is made by including the CWR chunk. | |
2873 | * This chunk contains one data element, i.e. the TSN number that | |
2874 | * was sent in the ECNE chunk. This element represents the lowest | |
2875 | * TSN number in the datagram that was originally marked with the | |
2876 | * CE bit. | |
2877 | * | |
2878 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2879 | * Inputs | |
2880 | * (endpoint, asoc, chunk) | |
2881 | * | |
2882 | * Outputs | |
2883 | * (asoc, reply_msg, msg_up, timers, counters) | |
2884 | * | |
2885 | * The return value is the disposition of the chunk. | |
2886 | */ | |
172a1599 XL |
2887 | enum sctp_disposition sctp_sf_do_ecn_cwr(struct net *net, |
2888 | const struct sctp_endpoint *ep, | |
2889 | const struct sctp_association *asoc, | |
2890 | const union sctp_subtype type, | |
2891 | void *arg, | |
2892 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2893 | { |
1da177e4 | 2894 | struct sctp_chunk *chunk = arg; |
65f77105 | 2895 | struct sctp_cwrhdr *cwr; |
34bcca28 | 2896 | u32 lowest_tsn; |
1da177e4 LT |
2897 | |
2898 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2899 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2900 | |
b515fd27 | 2901 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 2902 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 2903 | commands); |
d808ad9a | 2904 | |
65f77105 XL |
2905 | cwr = (struct sctp_cwrhdr *)chunk->skb->data; |
2906 | skb_pull(chunk->skb, sizeof(*cwr)); | |
1da177e4 | 2907 | |
34bcca28 | 2908 | lowest_tsn = ntohl(cwr->lowest_tsn); |
1da177e4 LT |
2909 | |
2910 | /* Does this CWR ack the last sent congestion notification? */ | |
34bcca28 | 2911 | if (TSN_lte(asoc->last_ecne_tsn, lowest_tsn)) { |
1da177e4 LT |
2912 | /* Stop sending ECNE. */ |
2913 | sctp_add_cmd_sf(commands, | |
2914 | SCTP_CMD_ECN_CWR, | |
34bcca28 | 2915 | SCTP_U32(lowest_tsn)); |
1da177e4 LT |
2916 | } |
2917 | return SCTP_DISPOSITION_CONSUME; | |
2918 | } | |
2919 | ||
2920 | /* | |
2921 | * sctp_sf_do_ecne | |
2922 | * | |
2923 | * Section: Appendix A: Explicit Congestion Notification | |
2924 | * | |
2925 | * ECN-Echo | |
2926 | * | |
2927 | * RFC 2481 details a specific bit for a receiver to send back in its | |
2928 | * TCP acknowledgements to notify the sender of the Congestion | |
2929 | * Experienced (CE) bit having arrived from the network. For SCTP this | |
2930 | * same indication is made by including the ECNE chunk. This chunk | |
2931 | * contains one data element, i.e. the lowest TSN associated with the IP | |
2932 | * datagram marked with the CE bit..... | |
2933 | * | |
2934 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2935 | * Inputs | |
2936 | * (endpoint, asoc, chunk) | |
2937 | * | |
2938 | * Outputs | |
2939 | * (asoc, reply_msg, msg_up, timers, counters) | |
2940 | * | |
2941 | * The return value is the disposition of the chunk. | |
2942 | */ | |
172a1599 XL |
2943 | enum sctp_disposition sctp_sf_do_ecne(struct net *net, |
2944 | const struct sctp_endpoint *ep, | |
2945 | const struct sctp_association *asoc, | |
2946 | const union sctp_subtype type, | |
2947 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 2948 | { |
1da177e4 | 2949 | struct sctp_chunk *chunk = arg; |
1fb6d83b | 2950 | struct sctp_ecnehdr *ecne; |
1da177e4 LT |
2951 | |
2952 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2953 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2954 | |
b515fd27 | 2955 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 2956 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2957 | commands); |
2958 | ||
1fb6d83b XL |
2959 | ecne = (struct sctp_ecnehdr *)chunk->skb->data; |
2960 | skb_pull(chunk->skb, sizeof(*ecne)); | |
1da177e4 LT |
2961 | |
2962 | /* If this is a newer ECNE than the last CWR packet we sent out */ | |
2963 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_ECNE, | |
2964 | SCTP_U32(ntohl(ecne->lowest_tsn))); | |
2965 | ||
2966 | return SCTP_DISPOSITION_CONSUME; | |
2967 | } | |
2968 | ||
2969 | /* | |
2970 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
2971 | * | |
2972 | * The SCTP endpoint MUST always acknowledge the reception of each valid | |
2973 | * DATA chunk. | |
2974 | * | |
2975 | * The guidelines on delayed acknowledgement algorithm specified in | |
2976 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
2977 | * acknowledgement SHOULD be generated for at least every second packet | |
2978 | * (not every second DATA chunk) received, and SHOULD be generated within | |
2979 | * 200 ms of the arrival of any unacknowledged DATA chunk. In some | |
2980 | * situations it may be beneficial for an SCTP transmitter to be more | |
2981 | * conservative than the algorithms detailed in this document allow. | |
2982 | * However, an SCTP transmitter MUST NOT be more aggressive than the | |
2983 | * following algorithms allow. | |
2984 | * | |
2985 | * A SCTP receiver MUST NOT generate more than one SACK for every | |
2986 | * incoming packet, other than to update the offered window as the | |
2987 | * receiving application consumes new data. | |
2988 | * | |
2989 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2990 | * | |
2991 | * Inputs | |
2992 | * (endpoint, asoc, chunk) | |
2993 | * | |
2994 | * Outputs | |
2995 | * (asoc, reply_msg, msg_up, timers, counters) | |
2996 | * | |
2997 | * The return value is the disposition of the chunk. | |
2998 | */ | |
172a1599 XL |
2999 | enum sctp_disposition sctp_sf_eat_data_6_2(struct net *net, |
3000 | const struct sctp_endpoint *ep, | |
3001 | const struct sctp_association *asoc, | |
3002 | const union sctp_subtype type, | |
3003 | void *arg, | |
3004 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3005 | { |
c488b770 | 3006 | union sctp_arg force = SCTP_NOFORCE(); |
1da177e4 LT |
3007 | struct sctp_chunk *chunk = arg; |
3008 | int error; | |
3009 | ||
3010 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3011 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3012 | SCTP_NULL()); | |
24cb81a6 | 3013 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3014 | } |
1da177e4 | 3015 | |
9d4ceaf1 | 3016 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3017 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3018 | commands); |
3019 | ||
cb3f837b | 3020 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3021 | switch (error) { |
3022 | case SCTP_IERROR_NO_ERROR: | |
3023 | break; | |
3024 | case SCTP_IERROR_HIGH_TSN: | |
3025 | case SCTP_IERROR_BAD_STREAM: | |
24cb81a6 | 3026 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3027 | goto discard_noforce; |
3028 | case SCTP_IERROR_DUP_TSN: | |
3029 | case SCTP_IERROR_IGNORE_TSN: | |
24cb81a6 | 3030 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3031 | goto discard_force; |
3032 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3033 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3034 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3035 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3036 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3037 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3038 | default: |
3039 | BUG(); | |
3040 | } | |
3041 | ||
6dc7694f WY |
3042 | if (chunk->chunk_hdr->flags & SCTP_DATA_SACK_IMM) |
3043 | force = SCTP_FORCE(); | |
3044 | ||
9f70f46b | 3045 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
3046 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
3047 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
3048 | } | |
3049 | ||
3050 | /* If this is the last chunk in a packet, we need to count it | |
3051 | * toward sack generation. Note that we need to SACK every | |
3052 | * OTHER packet containing data chunks, EVEN IF WE DISCARD | |
3053 | * THEM. We elect to NOT generate SACK's if the chunk fails | |
3054 | * the verification tag test. | |
3055 | * | |
3056 | * RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3057 | * | |
3058 | * The SCTP endpoint MUST always acknowledge the reception of | |
3059 | * each valid DATA chunk. | |
3060 | * | |
3061 | * The guidelines on delayed acknowledgement algorithm | |
3062 | * specified in Section 4.2 of [RFC2581] SHOULD be followed. | |
3063 | * Specifically, an acknowledgement SHOULD be generated for at | |
3064 | * least every second packet (not every second DATA chunk) | |
3065 | * received, and SHOULD be generated within 200 ms of the | |
3066 | * arrival of any unacknowledged DATA chunk. In some | |
3067 | * situations it may be beneficial for an SCTP transmitter to | |
3068 | * be more conservative than the algorithms detailed in this | |
3069 | * document allow. However, an SCTP transmitter MUST NOT be | |
3070 | * more aggressive than the following algorithms allow. | |
3071 | */ | |
52ccb8e9 | 3072 | if (chunk->end_of_packet) |
6dc7694f | 3073 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3074 | |
1da177e4 LT |
3075 | return SCTP_DISPOSITION_CONSUME; |
3076 | ||
3077 | discard_force: | |
3078 | /* RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3079 | * | |
3080 | * When a packet arrives with duplicate DATA chunk(s) and with | |
3081 | * no new DATA chunk(s), the endpoint MUST immediately send a | |
3082 | * SACK with no delay. If a packet arrives with duplicate | |
3083 | * DATA chunk(s) bundled with new DATA chunks, the endpoint | |
3084 | * MAY immediately send a SACK. Normally receipt of duplicate | |
3085 | * DATA chunks will occur when the original SACK chunk was lost | |
3086 | * and the peer's RTO has expired. The duplicate TSN number(s) | |
3087 | * SHOULD be reported in the SACK as duplicate. | |
3088 | */ | |
3089 | /* In our case, we split the MAY SACK advice up whether or not | |
3090 | * the last chunk is a duplicate.' | |
3091 | */ | |
3092 | if (chunk->end_of_packet) | |
3093 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3094 | return SCTP_DISPOSITION_DISCARD; | |
3095 | ||
3096 | discard_noforce: | |
52ccb8e9 | 3097 | if (chunk->end_of_packet) |
6dc7694f | 3098 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3099 | |
1da177e4 | 3100 | return SCTP_DISPOSITION_DISCARD; |
1da177e4 LT |
3101 | } |
3102 | ||
3103 | /* | |
3104 | * sctp_sf_eat_data_fast_4_4 | |
3105 | * | |
3106 | * Section: 4 (4) | |
3107 | * (4) In SHUTDOWN-SENT state the endpoint MUST acknowledge any received | |
3108 | * DATA chunks without delay. | |
3109 | * | |
3110 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3111 | * Inputs | |
3112 | * (endpoint, asoc, chunk) | |
3113 | * | |
3114 | * Outputs | |
3115 | * (asoc, reply_msg, msg_up, timers, counters) | |
3116 | * | |
3117 | * The return value is the disposition of the chunk. | |
3118 | */ | |
172a1599 XL |
3119 | enum sctp_disposition sctp_sf_eat_data_fast_4_4( |
3120 | struct net *net, | |
3121 | const struct sctp_endpoint *ep, | |
3122 | const struct sctp_association *asoc, | |
3123 | const union sctp_subtype type, | |
3124 | void *arg, | |
3125 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3126 | { |
3127 | struct sctp_chunk *chunk = arg; | |
3128 | int error; | |
3129 | ||
3130 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3131 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3132 | SCTP_NULL()); | |
24cb81a6 | 3133 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3134 | } |
3135 | ||
9d4ceaf1 | 3136 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3137 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3138 | commands); |
3139 | ||
cb3f837b | 3140 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3141 | switch (error) { |
3142 | case SCTP_IERROR_NO_ERROR: | |
3143 | case SCTP_IERROR_HIGH_TSN: | |
3144 | case SCTP_IERROR_DUP_TSN: | |
3145 | case SCTP_IERROR_IGNORE_TSN: | |
3146 | case SCTP_IERROR_BAD_STREAM: | |
3147 | break; | |
3148 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3149 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3150 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3151 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3152 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3153 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3154 | default: |
3155 | BUG(); | |
3156 | } | |
3157 | ||
3158 | /* Go a head and force a SACK, since we are shutting down. */ | |
3159 | ||
3160 | /* Implementor's Guide. | |
3161 | * | |
3162 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
3163 | * respond to each received packet containing one or more DATA chunk(s) | |
3164 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
3165 | */ | |
3166 | if (chunk->end_of_packet) { | |
3167 | /* We must delay the chunk creation since the cumulative | |
3168 | * TSN has not been updated yet. | |
3169 | */ | |
3170 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
3171 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3172 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
3173 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3174 | } | |
3175 | ||
1da177e4 LT |
3176 | return SCTP_DISPOSITION_CONSUME; |
3177 | } | |
3178 | ||
3179 | /* | |
3180 | * Section: 6.2 Processing a Received SACK | |
3181 | * D) Any time a SACK arrives, the endpoint performs the following: | |
3182 | * | |
3183 | * i) If Cumulative TSN Ack is less than the Cumulative TSN Ack Point, | |
3184 | * then drop the SACK. Since Cumulative TSN Ack is monotonically | |
3185 | * increasing, a SACK whose Cumulative TSN Ack is less than the | |
3186 | * Cumulative TSN Ack Point indicates an out-of-order SACK. | |
3187 | * | |
3188 | * ii) Set rwnd equal to the newly received a_rwnd minus the number | |
3189 | * of bytes still outstanding after processing the Cumulative TSN Ack | |
3190 | * and the Gap Ack Blocks. | |
3191 | * | |
3192 | * iii) If the SACK is missing a TSN that was previously | |
3193 | * acknowledged via a Gap Ack Block (e.g., the data receiver | |
3194 | * reneged on the data), then mark the corresponding DATA chunk | |
3195 | * as available for retransmit: Mark it as missing for fast | |
3196 | * retransmit as described in Section 7.2.4 and if no retransmit | |
3197 | * timer is running for the destination address to which the DATA | |
3198 | * chunk was originally transmitted, then T3-rtx is started for | |
3199 | * that destination address. | |
3200 | * | |
3201 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3202 | * | |
3203 | * Inputs | |
3204 | * (endpoint, asoc, chunk) | |
3205 | * | |
3206 | * Outputs | |
3207 | * (asoc, reply_msg, msg_up, timers, counters) | |
3208 | * | |
3209 | * The return value is the disposition of the chunk. | |
3210 | */ | |
172a1599 XL |
3211 | enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net, |
3212 | const struct sctp_endpoint *ep, | |
3213 | const struct sctp_association *asoc, | |
3214 | const union sctp_subtype type, | |
3215 | void *arg, | |
3216 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3217 | { |
3218 | struct sctp_chunk *chunk = arg; | |
78731085 | 3219 | struct sctp_sackhdr *sackh; |
1da177e4 LT |
3220 | __u32 ctsn; |
3221 | ||
3222 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3223 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3224 | |
3225 | /* Make sure that the SACK chunk has a valid length. */ | |
d4d6c614 | 3226 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_sack_chunk))) |
24cb81a6 | 3227 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3228 | commands); |
3229 | ||
3230 | /* Pull the SACK chunk from the data buffer */ | |
3231 | sackh = sctp_sm_pull_sack(chunk); | |
3232 | /* Was this a bogus SACK? */ | |
3233 | if (!sackh) | |
24cb81a6 | 3234 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3235 | chunk->subh.sack_hdr = sackh; |
3236 | ctsn = ntohl(sackh->cum_tsn_ack); | |
3237 | ||
3238 | /* i) If Cumulative TSN Ack is less than the Cumulative TSN | |
3239 | * Ack Point, then drop the SACK. Since Cumulative TSN | |
3240 | * Ack is monotonically increasing, a SACK whose | |
3241 | * Cumulative TSN Ack is less than the Cumulative TSN Ack | |
3242 | * Point indicates an out-of-order SACK. | |
3243 | */ | |
3244 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
3245 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
3246 | asoc->ctsn_ack_point); | |
3247 | ||
1da177e4 LT |
3248 | return SCTP_DISPOSITION_DISCARD; |
3249 | } | |
3250 | ||
aecedeab WY |
3251 | /* If Cumulative TSN Ack beyond the max tsn currently |
3252 | * send, terminating the association and respond to the | |
3253 | * sender with an ABORT. | |
3254 | */ | |
3255 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 3256 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
aecedeab | 3257 | |
1da177e4 | 3258 | /* Return this SACK for further processing. */ |
edfee033 | 3259 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk)); |
1da177e4 LT |
3260 | |
3261 | /* Note: We do the rest of the work on the PROCESS_SACK | |
3262 | * sideeffect. | |
3263 | */ | |
3264 | return SCTP_DISPOSITION_CONSUME; | |
3265 | } | |
3266 | ||
3267 | /* | |
3268 | * Generate an ABORT in response to a packet. | |
3269 | * | |
047a2428 | 3270 | * Section: 8.4 Handle "Out of the blue" Packets, sctpimpguide 2.41 |
1da177e4 | 3271 | * |
047a2428 JF |
3272 | * 8) The receiver should respond to the sender of the OOTB packet with |
3273 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3274 | * MUST fill in the Verification Tag field of the outbound packet | |
3275 | * with the value found in the Verification Tag field of the OOTB | |
3276 | * packet and set the T-bit in the Chunk Flags to indicate that the | |
3277 | * Verification Tag is reflected. After sending this ABORT, the | |
3278 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3279 | * no further action. | |
1da177e4 LT |
3280 | * |
3281 | * Verification Tag: | |
3282 | * | |
3283 | * The return value is the disposition of the chunk. | |
3284 | */ | |
172a1599 XL |
3285 | static enum sctp_disposition sctp_sf_tabort_8_4_8( |
3286 | struct net *net, | |
24cb81a6 | 3287 | const struct sctp_endpoint *ep, |
1da177e4 | 3288 | const struct sctp_association *asoc, |
bfc6f827 | 3289 | const union sctp_subtype type, |
1da177e4 | 3290 | void *arg, |
a85bbeb2 | 3291 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
3292 | { |
3293 | struct sctp_packet *packet = NULL; | |
3294 | struct sctp_chunk *chunk = arg; | |
3295 | struct sctp_chunk *abort; | |
3296 | ||
2ce95503 | 3297 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
eab59075 MRL |
3298 | if (!packet) |
3299 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3300 | |
eab59075 MRL |
3301 | /* Make an ABORT. The T bit will be set if the asoc |
3302 | * is NULL. | |
3303 | */ | |
3304 | abort = sctp_make_abort(asoc, chunk, 0); | |
3305 | if (!abort) { | |
3306 | sctp_ootb_pkt_free(packet); | |
3307 | return SCTP_DISPOSITION_NOMEM; | |
3308 | } | |
047a2428 | 3309 | |
eab59075 MRL |
3310 | /* Reflect vtag if T-Bit is set */ |
3311 | if (sctp_test_T_bit(abort)) | |
3312 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3313 | |
eab59075 MRL |
3314 | /* Set the skb to the belonging sock for accounting. */ |
3315 | abort->skb->sk = ep->base.sk; | |
1da177e4 | 3316 | |
eab59075 | 3317 | sctp_packet_append_chunk(packet, abort); |
1da177e4 | 3318 | |
eab59075 MRL |
3319 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3320 | SCTP_PACKET(packet)); | |
1da177e4 | 3321 | |
eab59075 | 3322 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3323 | |
eab59075 MRL |
3324 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3325 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
3326 | } |
3327 | ||
3328 | /* | |
3329 | * Received an ERROR chunk from peer. Generate SCTP_REMOTE_ERROR | |
3330 | * event as ULP notification for each cause included in the chunk. | |
3331 | * | |
3332 | * API 5.3.1.3 - SCTP_REMOTE_ERROR | |
3333 | * | |
3334 | * The return value is the disposition of the chunk. | |
3335 | */ | |
172a1599 XL |
3336 | enum sctp_disposition sctp_sf_operr_notify(struct net *net, |
3337 | const struct sctp_endpoint *ep, | |
3338 | const struct sctp_association *asoc, | |
3339 | const union sctp_subtype type, | |
3340 | void *arg, | |
3341 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3342 | { |
3343 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 3344 | struct sctp_errhdr *err; |
1da177e4 LT |
3345 | |
3346 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3347 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3348 | |
3349 | /* Make sure that the ERROR chunk has a valid length. */ | |
87caeba7 | 3350 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 3351 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3352 | commands); |
8a00be1c SW |
3353 | sctp_walk_errors(err, chunk->chunk_hdr); |
3354 | if ((void *)err != (void *)chunk->chunk_end) | |
24cb81a6 | 3355 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
8a00be1c | 3356 | (void *)err, commands); |
1da177e4 | 3357 | |
3df26787 WY |
3358 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_OPERR, |
3359 | SCTP_CHUNK(chunk)); | |
1da177e4 | 3360 | |
1da177e4 | 3361 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
3362 | } |
3363 | ||
3364 | /* | |
3365 | * Process an inbound SHUTDOWN ACK. | |
3366 | * | |
3367 | * From Section 9.2: | |
3368 | * Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3369 | * stop the T2-shutdown timer, send a SHUTDOWN COMPLETE chunk to its | |
3370 | * peer, and remove all record of the association. | |
3371 | * | |
3372 | * The return value is the disposition. | |
3373 | */ | |
172a1599 XL |
3374 | enum sctp_disposition sctp_sf_do_9_2_final(struct net *net, |
3375 | const struct sctp_endpoint *ep, | |
3376 | const struct sctp_association *asoc, | |
3377 | const union sctp_subtype type, | |
3378 | void *arg, | |
3379 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3380 | { |
3381 | struct sctp_chunk *chunk = arg; | |
3382 | struct sctp_chunk *reply; | |
3383 | struct sctp_ulpevent *ev; | |
3384 | ||
3385 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3386 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3387 | |
3388 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3389 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3390 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3391 | commands); |
1da177e4 LT |
3392 | /* 10.2 H) SHUTDOWN COMPLETE notification |
3393 | * | |
3394 | * When SCTP completes the shutdown procedures (section 9.2) this | |
3395 | * notification is passed to the upper layer. | |
3396 | */ | |
3397 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 3398 | 0, 0, 0, NULL, GFP_ATOMIC); |
1da177e4 LT |
3399 | if (!ev) |
3400 | goto nomem; | |
3401 | ||
df7deeb5 VY |
3402 | /* ...send a SHUTDOWN COMPLETE chunk to its peer, */ |
3403 | reply = sctp_make_shutdown_complete(asoc, chunk); | |
3404 | if (!reply) | |
3405 | goto nomem_chunk; | |
3406 | ||
3407 | /* Do all the commands now (after allocation), so that we | |
3408 | * have consistent state if memory allocation failes | |
3409 | */ | |
1da177e4 LT |
3410 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
3411 | ||
3412 | /* Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3413 | * stop the T2-shutdown timer, | |
3414 | */ | |
3415 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3416 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3417 | ||
3418 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3419 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
3420 | ||
1da177e4 LT |
3421 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
3422 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
b01a2407 EB |
3423 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
3424 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3425 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); |
3426 | ||
3427 | /* ...and remove all record of the association. */ | |
3428 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
3429 | return SCTP_DISPOSITION_DELETE_TCB; | |
3430 | ||
df7deeb5 VY |
3431 | nomem_chunk: |
3432 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
3433 | nomem: |
3434 | return SCTP_DISPOSITION_NOMEM; | |
3435 | } | |
3436 | ||
3437 | /* | |
047a2428 JF |
3438 | * RFC 2960, 8.4 - Handle "Out of the blue" Packets, sctpimpguide 2.41. |
3439 | * | |
1da177e4 LT |
3440 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
3441 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. | |
3442 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3443 | * packet must fill in the Verification Tag field of the outbound | |
3444 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
047a2428 JF |
3445 | * set the T-bit in the Chunk Flags to indicate that the Verification |
3446 | * Tag is reflected. | |
1da177e4 LT |
3447 | * |
3448 | * 8) The receiver should respond to the sender of the OOTB packet with | |
3449 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3450 | * MUST fill in the Verification Tag field of the outbound packet | |
3451 | * with the value found in the Verification Tag field of the OOTB | |
047a2428 JF |
3452 | * packet and set the T-bit in the Chunk Flags to indicate that the |
3453 | * Verification Tag is reflected. After sending this ABORT, the | |
3454 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3455 | * no further action. | |
1da177e4 | 3456 | */ |
172a1599 XL |
3457 | enum sctp_disposition sctp_sf_ootb(struct net *net, |
3458 | const struct sctp_endpoint *ep, | |
3459 | const struct sctp_association *asoc, | |
3460 | const union sctp_subtype type, | |
3461 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3462 | { |
3463 | struct sctp_chunk *chunk = arg; | |
3464 | struct sk_buff *skb = chunk->skb; | |
922dbc5b | 3465 | struct sctp_chunkhdr *ch; |
d8238d9d | 3466 | struct sctp_errhdr *err; |
85c5ed4e | 3467 | int ootb_cookie_ack = 0; |
172a1599 XL |
3468 | int ootb_shut_ack = 0; |
3469 | __u8 *ch_end; | |
1da177e4 | 3470 | |
b01a2407 | 3471 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
1da177e4 | 3472 | |
922dbc5b | 3473 | ch = (struct sctp_chunkhdr *)chunk->chunk_hdr; |
1da177e4 | 3474 | do { |
ece25dfa | 3475 | /* Report violation if the chunk is less then minimal */ |
922dbc5b | 3476 | if (ntohs(ch->length) < sizeof(*ch)) |
24cb81a6 | 3477 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 3478 | commands); |
1da177e4 | 3479 | |
bf911e98 MRL |
3480 | /* Report violation if chunk len overflows */ |
3481 | ch_end = ((__u8 *)ch) + SCTP_PAD4(ntohs(ch->length)); | |
3482 | if (ch_end > skb_tail_pointer(skb)) | |
3483 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3484 | commands); | |
3485 | ||
ece25dfa VY |
3486 | /* Now that we know we at least have a chunk header, |
3487 | * do things that are type appropriate. | |
3488 | */ | |
1da177e4 LT |
3489 | if (SCTP_CID_SHUTDOWN_ACK == ch->type) |
3490 | ootb_shut_ack = 1; | |
3491 | ||
3492 | /* RFC 2960, Section 3.3.7 | |
3493 | * Moreover, under any circumstances, an endpoint that | |
3494 | * receives an ABORT MUST NOT respond to that ABORT by | |
3495 | * sending an ABORT of its own. | |
3496 | */ | |
3497 | if (SCTP_CID_ABORT == ch->type) | |
24cb81a6 | 3498 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3499 | |
85c5ed4e SW |
3500 | /* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR |
3501 | * or a COOKIE ACK the SCTP Packet should be silently | |
3502 | * discarded. | |
3503 | */ | |
3504 | ||
3505 | if (SCTP_CID_COOKIE_ACK == ch->type) | |
3506 | ootb_cookie_ack = 1; | |
3507 | ||
3508 | if (SCTP_CID_ERROR == ch->type) { | |
3509 | sctp_walk_errors(err, ch) { | |
3510 | if (SCTP_ERROR_STALE_COOKIE == err->cause) { | |
3511 | ootb_cookie_ack = 1; | |
3512 | break; | |
3513 | } | |
3514 | } | |
3515 | } | |
3516 | ||
922dbc5b | 3517 | ch = (struct sctp_chunkhdr *)ch_end; |
27a884dc | 3518 | } while (ch_end < skb_tail_pointer(skb)); |
1da177e4 LT |
3519 | |
3520 | if (ootb_shut_ack) | |
24cb81a6 | 3521 | return sctp_sf_shut_8_4_5(net, ep, asoc, type, arg, commands); |
85c5ed4e | 3522 | else if (ootb_cookie_ack) |
24cb81a6 | 3523 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3524 | else |
24cb81a6 | 3525 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3526 | } |
3527 | ||
3528 | /* | |
3529 | * Handle an "Out of the blue" SHUTDOWN ACK. | |
3530 | * | |
047a2428 JF |
3531 | * Section: 8.4 5, sctpimpguide 2.41. |
3532 | * | |
1da177e4 | 3533 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
047a2428 JF |
3534 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. |
3535 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3536 | * packet must fill in the Verification Tag field of the outbound | |
3537 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
3538 | * set the T-bit in the Chunk Flags to indicate that the Verification | |
3539 | * Tag is reflected. | |
1da177e4 LT |
3540 | * |
3541 | * Inputs | |
3542 | * (endpoint, asoc, type, arg, commands) | |
3543 | * | |
3544 | * Outputs | |
172a1599 | 3545 | * (enum sctp_disposition) |
1da177e4 LT |
3546 | * |
3547 | * The return value is the disposition of the chunk. | |
3548 | */ | |
172a1599 XL |
3549 | static enum sctp_disposition sctp_sf_shut_8_4_5( |
3550 | struct net *net, | |
3551 | const struct sctp_endpoint *ep, | |
3552 | const struct sctp_association *asoc, | |
3553 | const union sctp_subtype type, | |
3554 | void *arg, | |
3555 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3556 | { |
3557 | struct sctp_packet *packet = NULL; | |
3558 | struct sctp_chunk *chunk = arg; | |
3559 | struct sctp_chunk *shut; | |
3560 | ||
2ce95503 | 3561 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1ff01561 MRL |
3562 | if (!packet) |
3563 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3564 | |
1ff01561 MRL |
3565 | /* Make an SHUTDOWN_COMPLETE. |
3566 | * The T bit will be set if the asoc is NULL. | |
3567 | */ | |
3568 | shut = sctp_make_shutdown_complete(asoc, chunk); | |
3569 | if (!shut) { | |
3570 | sctp_ootb_pkt_free(packet); | |
3571 | return SCTP_DISPOSITION_NOMEM; | |
3572 | } | |
047a2428 | 3573 | |
1ff01561 MRL |
3574 | /* Reflect vtag if T-Bit is set */ |
3575 | if (sctp_test_T_bit(shut)) | |
3576 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3577 | |
1ff01561 MRL |
3578 | /* Set the skb to the belonging sock for accounting. */ |
3579 | shut->skb->sk = ep->base.sk; | |
1da177e4 | 3580 | |
1ff01561 | 3581 | sctp_packet_append_chunk(packet, shut); |
1da177e4 | 3582 | |
1ff01561 MRL |
3583 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3584 | SCTP_PACKET(packet)); | |
1da177e4 | 3585 | |
1ff01561 | 3586 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3587 | |
1ff01561 MRL |
3588 | /* If the chunk length is invalid, we don't want to process |
3589 | * the reset of the packet. | |
3590 | */ | |
922dbc5b | 3591 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3592 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3593 | |
1ff01561 MRL |
3594 | /* We need to discard the rest of the packet to prevent |
3595 | * potential bomming attacks from additional bundled chunks. | |
3596 | * This is documented in SCTP Threats ID. | |
3597 | */ | |
3598 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1da177e4 LT |
3599 | } |
3600 | ||
3601 | /* | |
3602 | * Handle SHUTDOWN ACK in COOKIE_ECHOED or COOKIE_WAIT state. | |
3603 | * | |
3604 | * Verification Tag: 8.5.1 E) Rules for packet carrying a SHUTDOWN ACK | |
3605 | * If the receiver is in COOKIE-ECHOED or COOKIE-WAIT state the | |
3606 | * procedures in section 8.4 SHOULD be followed, in other words it | |
3607 | * should be treated as an Out Of The Blue packet. | |
3608 | * [This means that we do NOT check the Verification Tag on these | |
3609 | * chunks. --piggy ] | |
3610 | * | |
3611 | */ | |
172a1599 XL |
3612 | enum sctp_disposition sctp_sf_do_8_5_1_E_sa(struct net *net, |
3613 | const struct sctp_endpoint *ep, | |
3614 | const struct sctp_association *asoc, | |
3615 | const union sctp_subtype type, | |
3616 | void *arg, | |
3617 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3618 | { |
ece25dfa VY |
3619 | struct sctp_chunk *chunk = arg; |
3620 | ||
3621 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3622 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3623 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
3624 | commands); |
3625 | ||
1da177e4 LT |
3626 | /* Although we do have an association in this case, it corresponds |
3627 | * to a restarted association. So the packet is treated as an OOTB | |
3628 | * packet and the state function that handles OOTB SHUTDOWN_ACK is | |
3629 | * called with a NULL association. | |
3630 | */ | |
24cb81a6 | 3631 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
8190f89d | 3632 | |
24cb81a6 | 3633 | return sctp_sf_shut_8_4_5(net, ep, NULL, type, arg, commands); |
1da177e4 LT |
3634 | } |
3635 | ||
3636 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. */ | |
172a1599 XL |
3637 | enum sctp_disposition sctp_sf_do_asconf(struct net *net, |
3638 | const struct sctp_endpoint *ep, | |
3639 | const struct sctp_association *asoc, | |
3640 | const union sctp_subtype type, | |
3641 | void *arg, | |
3642 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3643 | { |
172a1599 XL |
3644 | struct sctp_paramhdr *err_param = NULL; |
3645 | struct sctp_chunk *asconf_ack = NULL; | |
3646 | struct sctp_chunk *chunk = arg; | |
3647 | struct sctp_addiphdr *hdr; | |
3648 | __u32 serial; | |
1da177e4 LT |
3649 | |
3650 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3651 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3652 | SCTP_NULL()); | |
24cb81a6 | 3653 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3654 | } |
3655 | ||
6afd2e83 VY |
3656 | /* ADD-IP: Section 4.1.1 |
3657 | * This chunk MUST be sent in an authenticated way by using | |
3658 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3659 | * is received unauthenticated it MUST be silently discarded as | |
3660 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3661 | */ | |
e1fc3b14 | 3662 | if (!net->sctp.addip_noauth && !chunk->auth) |
68d75469 XL |
3663 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
3664 | commands); | |
6afd2e83 | 3665 | |
1da177e4 | 3666 | /* Make sure that the ASCONF ADDIP chunk has a valid length. */ |
68d75469 | 3667 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_addip_chunk))) |
24cb81a6 | 3668 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3669 | commands); |
3670 | ||
65205cc4 | 3671 | hdr = (struct sctp_addiphdr *)chunk->skb->data; |
1da177e4 LT |
3672 | serial = ntohl(hdr->serial); |
3673 | ||
6f4c618d | 3674 | /* Verify the ASCONF chunk before processing it. */ |
9de7922b | 3675 | if (!sctp_verify_asconf(asoc, chunk, true, &err_param)) |
24cb81a6 | 3676 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3677 | (void *)err_param, commands); |
6f4c618d | 3678 | |
a08de64d | 3679 | /* ADDIP 5.2 E1) Compare the value of the serial number to the value |
1da177e4 | 3680 | * the endpoint stored in a new association variable |
d808ad9a | 3681 | * 'Peer-Serial-Number'. |
1da177e4 LT |
3682 | */ |
3683 | if (serial == asoc->peer.addip_serial + 1) { | |
a08de64d VY |
3684 | /* If this is the first instance of ASCONF in the packet, |
3685 | * we can clean our old ASCONF-ACKs. | |
3686 | */ | |
3687 | if (!chunk->has_asconf) | |
3688 | sctp_assoc_clean_asconf_ack_cache(asoc); | |
3689 | ||
3690 | /* ADDIP 5.2 E4) When the Sequence Number matches the next one | |
3691 | * expected, process the ASCONF as described below and after | |
3692 | * processing the ASCONF Chunk, append an ASCONF-ACK Chunk to | |
3693 | * the response packet and cache a copy of it (in the event it | |
3694 | * later needs to be retransmitted). | |
3695 | * | |
3696 | * Essentially, do V1-V5. | |
1da177e4 LT |
3697 | */ |
3698 | asconf_ack = sctp_process_asconf((struct sctp_association *) | |
3699 | asoc, chunk); | |
3700 | if (!asconf_ack) | |
3701 | return SCTP_DISPOSITION_NOMEM; | |
a08de64d VY |
3702 | } else if (serial < asoc->peer.addip_serial + 1) { |
3703 | /* ADDIP 5.2 E2) | |
3704 | * If the value found in the Sequence Number is less than the | |
3705 | * ('Peer- Sequence-Number' + 1), simply skip to the next | |
3706 | * ASCONF, and include in the outbound response packet | |
3707 | * any previously cached ASCONF-ACK response that was | |
3708 | * sent and saved that matches the Sequence Number of the | |
3709 | * ASCONF. Note: It is possible that no cached ASCONF-ACK | |
3710 | * Chunk exists. This will occur when an older ASCONF | |
3711 | * arrives out of order. In such a case, the receiver | |
3712 | * should skip the ASCONF Chunk and not include ASCONF-ACK | |
3713 | * Chunk for that chunk. | |
1da177e4 | 3714 | */ |
a08de64d VY |
3715 | asconf_ack = sctp_assoc_lookup_asconf_ack(asoc, hdr->serial); |
3716 | if (!asconf_ack) | |
1da177e4 | 3717 | return SCTP_DISPOSITION_DISCARD; |
31b02e15 VY |
3718 | |
3719 | /* Reset the transport so that we select the correct one | |
3720 | * this time around. This is to make sure that we don't | |
3721 | * accidentally use a stale transport that's been removed. | |
3722 | */ | |
3723 | asconf_ack->transport = NULL; | |
1da177e4 | 3724 | } else { |
a08de64d | 3725 | /* ADDIP 5.2 E5) Otherwise, the ASCONF Chunk is discarded since |
1da177e4 | 3726 | * it must be either a stale packet or from an attacker. |
d808ad9a | 3727 | */ |
1da177e4 LT |
3728 | return SCTP_DISPOSITION_DISCARD; |
3729 | } | |
3730 | ||
a08de64d VY |
3731 | /* ADDIP 5.2 E6) The destination address of the SCTP packet |
3732 | * containing the ASCONF-ACK Chunks MUST be the source address of | |
3733 | * the SCTP packet that held the ASCONF Chunks. | |
3734 | * | |
3735 | * To do this properly, we'll set the destination address of the chunk | |
3736 | * and at the transmit time, will try look up the transport to use. | |
3737 | * Since ASCONFs may be bundled, the correct transport may not be | |
94e2bd68 | 3738 | * created until we process the entire packet, thus this workaround. |
1da177e4 | 3739 | */ |
a08de64d | 3740 | asconf_ack->dest = chunk->source; |
1da177e4 | 3741 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asconf_ack)); |
6af29ccc | 3742 | if (asoc->new_transport) { |
f7010e61 | 3743 | sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport, commands); |
6af29ccc MH |
3744 | ((struct sctp_association *)asoc)->new_transport = NULL; |
3745 | } | |
d808ad9a | 3746 | |
1da177e4 LT |
3747 | return SCTP_DISPOSITION_CONSUME; |
3748 | } | |
3749 | ||
3750 | /* | |
3751 | * ADDIP Section 4.3 General rules for address manipulation | |
3752 | * When building TLV parameters for the ASCONF Chunk that will add or | |
3753 | * delete IP addresses the D0 to D13 rules should be applied: | |
3754 | */ | |
172a1599 XL |
3755 | enum sctp_disposition sctp_sf_do_asconf_ack(struct net *net, |
3756 | const struct sctp_endpoint *ep, | |
3757 | const struct sctp_association *asoc, | |
3758 | const union sctp_subtype type, | |
3759 | void *arg, | |
3760 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3761 | { |
172a1599 XL |
3762 | struct sctp_chunk *last_asconf = asoc->addip_last_asconf; |
3763 | struct sctp_paramhdr *err_param = NULL; | |
3764 | struct sctp_chunk *asconf_ack = arg; | |
3765 | struct sctp_addiphdr *addip_hdr; | |
3766 | __u32 sent_serial, rcvd_serial; | |
3767 | struct sctp_chunk *abort; | |
1da177e4 LT |
3768 | |
3769 | if (!sctp_vtag_verify(asconf_ack, asoc)) { | |
3770 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3771 | SCTP_NULL()); | |
24cb81a6 | 3772 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3773 | } |
3774 | ||
6afd2e83 VY |
3775 | /* ADD-IP, Section 4.1.2: |
3776 | * This chunk MUST be sent in an authenticated way by using | |
3777 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3778 | * is received unauthenticated it MUST be silently discarded as | |
3779 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3780 | */ | |
e1fc3b14 | 3781 | if (!net->sctp.addip_noauth && !asconf_ack->auth) |
68d75469 XL |
3782 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
3783 | commands); | |
6afd2e83 | 3784 | |
1da177e4 | 3785 | /* Make sure that the ADDIP chunk has a valid length. */ |
68d75469 XL |
3786 | if (!sctp_chunk_length_valid(asconf_ack, |
3787 | sizeof(struct sctp_addip_chunk))) | |
24cb81a6 | 3788 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3789 | commands); |
3790 | ||
65205cc4 | 3791 | addip_hdr = (struct sctp_addiphdr *)asconf_ack->skb->data; |
1da177e4 LT |
3792 | rcvd_serial = ntohl(addip_hdr->serial); |
3793 | ||
6f4c618d | 3794 | /* Verify the ASCONF-ACK chunk before processing it. */ |
9de7922b | 3795 | if (!sctp_verify_asconf(asoc, asconf_ack, false, &err_param)) |
24cb81a6 | 3796 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3797 | (void *)err_param, commands); |
6f4c618d | 3798 | |
1da177e4 | 3799 | if (last_asconf) { |
65205cc4 | 3800 | addip_hdr = (struct sctp_addiphdr *)last_asconf->subh.addip_hdr; |
1da177e4 LT |
3801 | sent_serial = ntohl(addip_hdr->serial); |
3802 | } else { | |
3803 | sent_serial = asoc->addip_serial - 1; | |
3804 | } | |
3805 | ||
3806 | /* D0) If an endpoint receives an ASCONF-ACK that is greater than or | |
3807 | * equal to the next serial number to be used but no ASCONF chunk is | |
3808 | * outstanding the endpoint MUST ABORT the association. Note that a | |
3809 | * sequence number is greater than if it is no more than 2^^31-1 | |
3810 | * larger than the current sequence number (using serial arithmetic). | |
3811 | */ | |
3812 | if (ADDIP_SERIAL_gte(rcvd_serial, sent_serial + 1) && | |
3813 | !(asoc->addip_last_asconf)) { | |
3814 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3815 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3816 | if (abort) { |
00f1c2df | 3817 | sctp_init_cause(abort, SCTP_ERROR_ASCONF_ACK, 0); |
1da177e4 LT |
3818 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3819 | SCTP_CHUNK(abort)); | |
3820 | } | |
3821 | /* We are going to ABORT, so we might as well stop | |
3822 | * processing the rest of the chunks in the packet. | |
3823 | */ | |
3824 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3825 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
cb3f837b | 3826 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3827 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 3828 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 3829 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 3830 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
3831 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
3832 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3833 | return SCTP_DISPOSITION_ABORT; |
3834 | } | |
3835 | ||
3836 | if ((rcvd_serial == sent_serial) && asoc->addip_last_asconf) { | |
3837 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3838 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
3839 | ||
3840 | if (!sctp_process_asconf_ack((struct sctp_association *)asoc, | |
c0786693 VY |
3841 | asconf_ack)) { |
3842 | /* Successfully processed ASCONF_ACK. We can | |
3843 | * release the next asconf if we have one. | |
3844 | */ | |
3845 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_NEXT_ASCONF, | |
3846 | SCTP_NULL()); | |
1da177e4 | 3847 | return SCTP_DISPOSITION_CONSUME; |
c0786693 | 3848 | } |
1da177e4 LT |
3849 | |
3850 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3851 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3852 | if (abort) { |
00f1c2df | 3853 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); |
1da177e4 LT |
3854 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3855 | SCTP_CHUNK(abort)); | |
3856 | } | |
3857 | /* We are going to ABORT, so we might as well stop | |
3858 | * processing the rest of the chunks in the packet. | |
3859 | */ | |
cb3f837b | 3860 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3861 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 3862 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 3863 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 3864 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
3865 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
3866 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3867 | return SCTP_DISPOSITION_ABORT; |
3868 | } | |
3869 | ||
3870 | return SCTP_DISPOSITION_DISCARD; | |
3871 | } | |
3872 | ||
2040d3d7 | 3873 | /* RE-CONFIG Section 5.2 Upon reception of an RECONF Chunk. */ |
172a1599 XL |
3874 | enum sctp_disposition sctp_sf_do_reconf(struct net *net, |
3875 | const struct sctp_endpoint *ep, | |
3876 | const struct sctp_association *asoc, | |
3877 | const union sctp_subtype type, | |
3878 | void *arg, | |
3879 | struct sctp_cmd_seq *commands) | |
2040d3d7 XL |
3880 | { |
3881 | struct sctp_paramhdr *err_param = NULL; | |
3882 | struct sctp_chunk *chunk = arg; | |
3883 | struct sctp_reconf_chunk *hdr; | |
3884 | union sctp_params param; | |
3885 | ||
3886 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3887 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3888 | SCTP_NULL()); | |
3889 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
3890 | } | |
3891 | ||
3892 | /* Make sure that the RECONF chunk has a valid length. */ | |
3893 | if (!sctp_chunk_length_valid(chunk, sizeof(*hdr))) | |
3894 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3895 | commands); | |
3896 | ||
3897 | if (!sctp_verify_reconf(asoc, chunk, &err_param)) | |
3898 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
3899 | (void *)err_param, commands); | |
3900 | ||
3901 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
3902 | sctp_walk_params(param, hdr, params) { | |
3903 | struct sctp_chunk *reply = NULL; | |
3904 | struct sctp_ulpevent *ev = NULL; | |
3905 | ||
3906 | if (param.p->type == SCTP_PARAM_RESET_OUT_REQUEST) | |
3907 | reply = sctp_process_strreset_outreq( | |
3908 | (struct sctp_association *)asoc, param, &ev); | |
3909 | else if (param.p->type == SCTP_PARAM_RESET_IN_REQUEST) | |
3910 | reply = sctp_process_strreset_inreq( | |
3911 | (struct sctp_association *)asoc, param, &ev); | |
692787ce XL |
3912 | else if (param.p->type == SCTP_PARAM_RESET_TSN_REQUEST) |
3913 | reply = sctp_process_strreset_tsnreq( | |
3914 | (struct sctp_association *)asoc, param, &ev); | |
50a41591 XL |
3915 | else if (param.p->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) |
3916 | reply = sctp_process_strreset_addstrm_out( | |
3917 | (struct sctp_association *)asoc, param, &ev); | |
c5c4ebb3 XL |
3918 | else if (param.p->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) |
3919 | reply = sctp_process_strreset_addstrm_in( | |
3920 | (struct sctp_association *)asoc, param, &ev); | |
11ae76e6 XL |
3921 | else if (param.p->type == SCTP_PARAM_RESET_RESPONSE) |
3922 | reply = sctp_process_strreset_resp( | |
3923 | (struct sctp_association *)asoc, param, &ev); | |
2040d3d7 XL |
3924 | |
3925 | if (ev) | |
3926 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
3927 | SCTP_ULPEVENT(ev)); | |
3928 | ||
3929 | if (reply) | |
3930 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
3931 | SCTP_CHUNK(reply)); | |
3932 | } | |
3933 | ||
3934 | return SCTP_DISPOSITION_CONSUME; | |
3935 | } | |
3936 | ||
1da177e4 LT |
3937 | /* |
3938 | * PR-SCTP Section 3.6 Receiver Side Implementation of PR-SCTP | |
3939 | * | |
3940 | * When a FORWARD TSN chunk arrives, the data receiver MUST first update | |
3941 | * its cumulative TSN point to the value carried in the FORWARD TSN | |
3942 | * chunk, and then MUST further advance its cumulative TSN point locally | |
3943 | * if possible. | |
3944 | * After the above processing, the data receiver MUST stop reporting any | |
3945 | * missing TSNs earlier than or equal to the new cumulative TSN point. | |
3946 | * | |
3947 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3948 | * | |
3949 | * The return value is the disposition of the chunk. | |
3950 | */ | |
172a1599 XL |
3951 | enum sctp_disposition sctp_sf_eat_fwd_tsn(struct net *net, |
3952 | const struct sctp_endpoint *ep, | |
3953 | const struct sctp_association *asoc, | |
3954 | const union sctp_subtype type, | |
3955 | void *arg, | |
3956 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3957 | { |
1da177e4 | 3958 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 3959 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
3960 | __u16 len; |
3961 | __u32 tsn; | |
3962 | ||
3963 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3964 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3965 | SCTP_NULL()); | |
24cb81a6 | 3966 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3967 | } |
3968 | ||
d15c9ede XL |
3969 | if (!asoc->peer.prsctp_capable) |
3970 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
3971 | ||
1da177e4 | 3972 | /* Make sure that the FORWARD_TSN chunk has valid length. */ |
0fc2ea92 | 3973 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 3974 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3975 | commands); |
3976 | ||
3977 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
3978 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
3979 | len = ntohs(chunk->chunk_hdr->length); | |
3980 | len -= sizeof(struct sctp_chunkhdr); | |
3981 | skb_pull(chunk->skb, len); | |
3982 | ||
3983 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 3984 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
3985 | |
3986 | /* The TSN is too high--silently discard the chunk and count on it | |
3987 | * getting retransmitted later. | |
3988 | */ | |
3989 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
3990 | goto discard_noforce; | |
3991 | ||
0fc2ea92 XL |
3992 | if (!asoc->stream.si->validate_ftsn(chunk)) |
3993 | goto discard_noforce; | |
9fcb95a1 | 3994 | |
1da177e4 | 3995 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 3996 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 3997 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 3998 | SCTP_CHUNK(chunk)); |
d808ad9a | 3999 | |
1da177e4 | 4000 | /* Count this as receiving DATA. */ |
9f70f46b | 4001 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
4002 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
4003 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
4004 | } | |
d808ad9a | 4005 | |
1da177e4 | 4006 | /* FIXME: For now send a SACK, but DATA processing may |
d808ad9a | 4007 | * send another. |
1da177e4 LT |
4008 | */ |
4009 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE()); | |
1da177e4 LT |
4010 | |
4011 | return SCTP_DISPOSITION_CONSUME; | |
4012 | ||
4013 | discard_noforce: | |
4014 | return SCTP_DISPOSITION_DISCARD; | |
4015 | } | |
4016 | ||
172a1599 XL |
4017 | enum sctp_disposition sctp_sf_eat_fwd_tsn_fast( |
4018 | struct net *net, | |
4019 | const struct sctp_endpoint *ep, | |
4020 | const struct sctp_association *asoc, | |
4021 | const union sctp_subtype type, | |
4022 | void *arg, | |
4023 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4024 | { |
1da177e4 | 4025 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4026 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
4027 | __u16 len; |
4028 | __u32 tsn; | |
4029 | ||
4030 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4031 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4032 | SCTP_NULL()); | |
24cb81a6 | 4033 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4034 | } |
4035 | ||
d15c9ede XL |
4036 | if (!asoc->peer.prsctp_capable) |
4037 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4038 | ||
1da177e4 | 4039 | /* Make sure that the FORWARD_TSN chunk has a valid length. */ |
0fc2ea92 | 4040 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 4041 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4042 | commands); |
4043 | ||
4044 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4045 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4046 | len = ntohs(chunk->chunk_hdr->length); | |
4047 | len -= sizeof(struct sctp_chunkhdr); | |
4048 | skb_pull(chunk->skb, len); | |
4049 | ||
4050 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4051 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4052 | |
4053 | /* The TSN is too high--silently discard the chunk and count on it | |
4054 | * getting retransmitted later. | |
4055 | */ | |
4056 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4057 | goto gen_shutdown; | |
4058 | ||
0fc2ea92 XL |
4059 | if (!asoc->stream.si->validate_ftsn(chunk)) |
4060 | goto gen_shutdown; | |
9fcb95a1 | 4061 | |
1da177e4 | 4062 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 4063 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 4064 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4065 | SCTP_CHUNK(chunk)); |
d808ad9a | 4066 | |
1da177e4 LT |
4067 | /* Go a head and force a SACK, since we are shutting down. */ |
4068 | gen_shutdown: | |
4069 | /* Implementor's Guide. | |
4070 | * | |
4071 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
4072 | * respond to each received packet containing one or more DATA chunk(s) | |
4073 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
4074 | */ | |
4075 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
4076 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
4077 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
4078 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
4079 | ||
d808ad9a | 4080 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4081 | } |
4082 | ||
bbd0d598 | 4083 | /* |
25985edc | 4084 | * SCTP-AUTH Section 6.3 Receiving authenticated chukns |
bbd0d598 VY |
4085 | * |
4086 | * The receiver MUST use the HMAC algorithm indicated in the HMAC | |
4087 | * Identifier field. If this algorithm was not specified by the | |
4088 | * receiver in the HMAC-ALGO parameter in the INIT or INIT-ACK chunk | |
4089 | * during association setup, the AUTH chunk and all chunks after it MUST | |
4090 | * be discarded and an ERROR chunk SHOULD be sent with the error cause | |
4091 | * defined in Section 4.1. | |
4092 | * | |
4093 | * If an endpoint with no shared key receives a Shared Key Identifier | |
4094 | * other than 0, it MUST silently discard all authenticated chunks. If | |
4095 | * the endpoint has at least one endpoint pair shared key for the peer, | |
4096 | * it MUST use the key specified by the Shared Key Identifier if a | |
4097 | * key has been configured for that Shared Key Identifier. If no | |
4098 | * endpoint pair shared key has been configured for that Shared Key | |
4099 | * Identifier, all authenticated chunks MUST be silently discarded. | |
4100 | * | |
4101 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4102 | * | |
4103 | * The return value is the disposition of the chunk. | |
4104 | */ | |
4785c7ae | 4105 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 XL |
4106 | struct net *net, |
4107 | const struct sctp_endpoint *ep, | |
4108 | const struct sctp_association *asoc, | |
4109 | const union sctp_subtype type, | |
4110 | struct sctp_chunk *chunk) | |
bbd0d598 VY |
4111 | { |
4112 | struct sctp_authhdr *auth_hdr; | |
172a1599 | 4113 | __u8 *save_digest, *digest; |
bbd0d598 VY |
4114 | struct sctp_hmac *hmac; |
4115 | unsigned int sig_len; | |
4116 | __u16 key_id; | |
bbd0d598 VY |
4117 | |
4118 | /* Pull in the auth header, so we can do some more verification */ | |
4119 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
4120 | chunk->subh.auth_hdr = auth_hdr; | |
bb96dec7 | 4121 | skb_pull(chunk->skb, sizeof(*auth_hdr)); |
bbd0d598 | 4122 | |
02582e9b | 4123 | /* Make sure that we support the HMAC algorithm from the auth |
bbd0d598 VY |
4124 | * chunk. |
4125 | */ | |
4126 | if (!sctp_auth_asoc_verify_hmac_id(asoc, auth_hdr->hmac_id)) | |
4127 | return SCTP_IERROR_AUTH_BAD_HMAC; | |
4128 | ||
4129 | /* Make sure that the provided shared key identifier has been | |
4130 | * configured | |
4131 | */ | |
4132 | key_id = ntohs(auth_hdr->shkey_id); | |
4133 | if (key_id != asoc->active_key_id && !sctp_auth_get_shkey(asoc, key_id)) | |
4134 | return SCTP_IERROR_AUTH_BAD_KEYID; | |
4135 | ||
4136 | ||
4137 | /* Make sure that the length of the signature matches what | |
4138 | * we expect. | |
4139 | */ | |
bb96dec7 XL |
4140 | sig_len = ntohs(chunk->chunk_hdr->length) - |
4141 | sizeof(struct sctp_auth_chunk); | |
bbd0d598 VY |
4142 | hmac = sctp_auth_get_hmac(ntohs(auth_hdr->hmac_id)); |
4143 | if (sig_len != hmac->hmac_len) | |
4144 | return SCTP_IERROR_PROTO_VIOLATION; | |
4145 | ||
4146 | /* Now that we've done validation checks, we can compute and | |
4147 | * verify the hmac. The steps involved are: | |
4148 | * 1. Save the digest from the chunk. | |
4149 | * 2. Zero out the digest in the chunk. | |
4150 | * 3. Compute the new digest | |
4151 | * 4. Compare saved and new digests. | |
4152 | */ | |
4153 | digest = auth_hdr->hmac; | |
4154 | skb_pull(chunk->skb, sig_len); | |
4155 | ||
4156 | save_digest = kmemdup(digest, sig_len, GFP_ATOMIC); | |
4157 | if (!save_digest) | |
4158 | goto nomem; | |
4159 | ||
4160 | memset(digest, 0, sig_len); | |
4161 | ||
4162 | sctp_auth_calculate_hmac(asoc, chunk->skb, | |
bb96dec7 XL |
4163 | (struct sctp_auth_chunk *)chunk->chunk_hdr, |
4164 | GFP_ATOMIC); | |
bbd0d598 VY |
4165 | |
4166 | /* Discard the packet if the digests do not match */ | |
4167 | if (memcmp(save_digest, digest, sig_len)) { | |
4168 | kfree(save_digest); | |
4169 | return SCTP_IERROR_BAD_SIG; | |
4170 | } | |
4171 | ||
4172 | kfree(save_digest); | |
4173 | chunk->auth = 1; | |
4174 | ||
4175 | return SCTP_IERROR_NO_ERROR; | |
4176 | nomem: | |
4177 | return SCTP_IERROR_NOMEM; | |
4178 | } | |
4179 | ||
172a1599 XL |
4180 | enum sctp_disposition sctp_sf_eat_auth(struct net *net, |
4181 | const struct sctp_endpoint *ep, | |
4182 | const struct sctp_association *asoc, | |
4183 | const union sctp_subtype type, | |
4184 | void *arg, struct sctp_cmd_seq *commands) | |
bbd0d598 | 4185 | { |
bbd0d598 | 4186 | struct sctp_chunk *chunk = arg; |
4785c7ae | 4187 | struct sctp_authhdr *auth_hdr; |
bbd0d598 | 4188 | struct sctp_chunk *err_chunk; |
4785c7ae | 4189 | enum sctp_ierror error; |
bbd0d598 | 4190 | |
d2f19fa1 WY |
4191 | /* Make sure that the peer has AUTH capable */ |
4192 | if (!asoc->peer.auth_capable) | |
24cb81a6 | 4193 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); |
d2f19fa1 | 4194 | |
bbd0d598 VY |
4195 | if (!sctp_vtag_verify(chunk, asoc)) { |
4196 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4197 | SCTP_NULL()); | |
24cb81a6 | 4198 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 VY |
4199 | } |
4200 | ||
4201 | /* Make sure that the AUTH chunk has valid length. */ | |
4202 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_auth_chunk))) | |
24cb81a6 | 4203 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
bbd0d598 VY |
4204 | commands); |
4205 | ||
4206 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
24cb81a6 | 4207 | error = sctp_sf_authenticate(net, ep, asoc, type, chunk); |
bbd0d598 | 4208 | switch (error) { |
7fd71b1e JP |
4209 | case SCTP_IERROR_AUTH_BAD_HMAC: |
4210 | /* Generate the ERROR chunk and discard the rest | |
4211 | * of the packet | |
4212 | */ | |
4213 | err_chunk = sctp_make_op_error(asoc, chunk, | |
4214 | SCTP_ERROR_UNSUP_HMAC, | |
4215 | &auth_hdr->hmac_id, | |
4216 | sizeof(__u16), 0); | |
4217 | if (err_chunk) { | |
4218 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4219 | SCTP_CHUNK(err_chunk)); | |
4220 | } | |
4221 | /* Fall Through */ | |
4222 | case SCTP_IERROR_AUTH_BAD_KEYID: | |
4223 | case SCTP_IERROR_BAD_SIG: | |
24cb81a6 | 4224 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
7fd71b1e JP |
4225 | |
4226 | case SCTP_IERROR_PROTO_VIOLATION: | |
24cb81a6 | 4227 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
7fd71b1e JP |
4228 | commands); |
4229 | ||
4230 | case SCTP_IERROR_NOMEM: | |
4231 | return SCTP_DISPOSITION_NOMEM; | |
4232 | ||
4233 | default: /* Prevent gcc warnings */ | |
4234 | break; | |
bbd0d598 VY |
4235 | } |
4236 | ||
65b07e5d VY |
4237 | if (asoc->active_key_id != ntohs(auth_hdr->shkey_id)) { |
4238 | struct sctp_ulpevent *ev; | |
4239 | ||
4240 | ev = sctp_ulpevent_make_authkey(asoc, ntohs(auth_hdr->shkey_id), | |
4241 | SCTP_AUTH_NEWKEY, GFP_ATOMIC); | |
4242 | ||
4243 | if (!ev) | |
4244 | return -ENOMEM; | |
4245 | ||
4246 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
4247 | SCTP_ULPEVENT(ev)); | |
4248 | } | |
4249 | ||
bbd0d598 VY |
4250 | return SCTP_DISPOSITION_CONSUME; |
4251 | } | |
4252 | ||
1da177e4 LT |
4253 | /* |
4254 | * Process an unknown chunk. | |
4255 | * | |
4256 | * Section: 3.2. Also, 2.1 in the implementor's guide. | |
4257 | * | |
4258 | * Chunk Types are encoded such that the highest-order two bits specify | |
4259 | * the action that must be taken if the processing endpoint does not | |
4260 | * recognize the Chunk Type. | |
4261 | * | |
4262 | * 00 - Stop processing this SCTP packet and discard it, do not process | |
4263 | * any further chunks within it. | |
4264 | * | |
4265 | * 01 - Stop processing this SCTP packet and discard it, do not process | |
4266 | * any further chunks within it, and report the unrecognized | |
4267 | * chunk in an 'Unrecognized Chunk Type'. | |
4268 | * | |
4269 | * 10 - Skip this chunk and continue processing. | |
4270 | * | |
4271 | * 11 - Skip this chunk and continue processing, but report in an ERROR | |
4272 | * Chunk using the 'Unrecognized Chunk Type' cause of error. | |
4273 | * | |
4274 | * The return value is the disposition of the chunk. | |
4275 | */ | |
172a1599 XL |
4276 | enum sctp_disposition sctp_sf_unk_chunk(struct net *net, |
4277 | const struct sctp_endpoint *ep, | |
4278 | const struct sctp_association *asoc, | |
4279 | const union sctp_subtype type, | |
4280 | void *arg, | |
4281 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4282 | { |
4283 | struct sctp_chunk *unk_chunk = arg; | |
4284 | struct sctp_chunk *err_chunk; | |
922dbc5b | 4285 | struct sctp_chunkhdr *hdr; |
1da177e4 | 4286 | |
bb33381d | 4287 | pr_debug("%s: processing unknown chunk id:%d\n", __func__, type.chunk); |
1da177e4 LT |
4288 | |
4289 | if (!sctp_vtag_verify(unk_chunk, asoc)) | |
24cb81a6 | 4290 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4291 | |
4292 | /* Make sure that the chunk has a valid length. | |
4293 | * Since we don't know the chunk type, we use a general | |
4294 | * chunkhdr structure to make a comparison. | |
4295 | */ | |
922dbc5b | 4296 | if (!sctp_chunk_length_valid(unk_chunk, sizeof(*hdr))) |
24cb81a6 | 4297 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4298 | commands); |
4299 | ||
4300 | switch (type.chunk & SCTP_CID_ACTION_MASK) { | |
4301 | case SCTP_CID_ACTION_DISCARD: | |
4302 | /* Discard the packet. */ | |
24cb81a6 | 4303 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4304 | case SCTP_CID_ACTION_DISCARD_ERR: |
1da177e4 LT |
4305 | /* Generate an ERROR chunk as response. */ |
4306 | hdr = unk_chunk->chunk_hdr; | |
4307 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4308 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4309 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4310 | 0); |
1da177e4 LT |
4311 | if (err_chunk) { |
4312 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4313 | SCTP_CHUNK(err_chunk)); | |
4314 | } | |
2e3216cd VY |
4315 | |
4316 | /* Discard the packet. */ | |
24cb81a6 | 4317 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4318 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4319 | case SCTP_CID_ACTION_SKIP: |
4320 | /* Skip the chunk. */ | |
4321 | return SCTP_DISPOSITION_DISCARD; | |
1da177e4 LT |
4322 | case SCTP_CID_ACTION_SKIP_ERR: |
4323 | /* Generate an ERROR chunk as response. */ | |
4324 | hdr = unk_chunk->chunk_hdr; | |
4325 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4326 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4327 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4328 | 0); |
1da177e4 LT |
4329 | if (err_chunk) { |
4330 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4331 | SCTP_CHUNK(err_chunk)); | |
4332 | } | |
4333 | /* Skip the chunk. */ | |
4334 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
4335 | default: |
4336 | break; | |
4337 | } | |
4338 | ||
4339 | return SCTP_DISPOSITION_DISCARD; | |
4340 | } | |
4341 | ||
4342 | /* | |
4343 | * Discard the chunk. | |
4344 | * | |
4345 | * Section: 0.2, 5.2.3, 5.2.5, 5.2.6, 6.0, 8.4.6, 8.5.1c, 9.2 | |
4346 | * [Too numerous to mention...] | |
4347 | * Verification Tag: No verification needed. | |
4348 | * Inputs | |
4349 | * (endpoint, asoc, chunk) | |
4350 | * | |
4351 | * Outputs | |
4352 | * (asoc, reply_msg, msg_up, timers, counters) | |
4353 | * | |
4354 | * The return value is the disposition of the chunk. | |
4355 | */ | |
172a1599 XL |
4356 | enum sctp_disposition sctp_sf_discard_chunk(struct net *net, |
4357 | const struct sctp_endpoint *ep, | |
4358 | const struct sctp_association *asoc, | |
4359 | const union sctp_subtype type, | |
4360 | void *arg, | |
4361 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4362 | { |
ece25dfa VY |
4363 | struct sctp_chunk *chunk = arg; |
4364 | ||
4365 | /* Make sure that the chunk has a valid length. | |
4366 | * Since we don't know the chunk type, we use a general | |
4367 | * chunkhdr structure to make a comparison. | |
4368 | */ | |
922dbc5b | 4369 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4370 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4371 | commands); |
4372 | ||
bb33381d DB |
4373 | pr_debug("%s: chunk:%d is discarded\n", __func__, type.chunk); |
4374 | ||
1da177e4 LT |
4375 | return SCTP_DISPOSITION_DISCARD; |
4376 | } | |
4377 | ||
4378 | /* | |
4379 | * Discard the whole packet. | |
4380 | * | |
4381 | * Section: 8.4 2) | |
4382 | * | |
4383 | * 2) If the OOTB packet contains an ABORT chunk, the receiver MUST | |
4384 | * silently discard the OOTB packet and take no further action. | |
1da177e4 LT |
4385 | * |
4386 | * Verification Tag: No verification necessary | |
4387 | * | |
4388 | * Inputs | |
4389 | * (endpoint, asoc, chunk) | |
4390 | * | |
4391 | * Outputs | |
4392 | * (asoc, reply_msg, msg_up, timers, counters) | |
4393 | * | |
4394 | * The return value is the disposition of the chunk. | |
4395 | */ | |
172a1599 XL |
4396 | enum sctp_disposition sctp_sf_pdiscard(struct net *net, |
4397 | const struct sctp_endpoint *ep, | |
4398 | const struct sctp_association *asoc, | |
4399 | const union sctp_subtype type, | |
4400 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 4401 | { |
24cb81a6 | 4402 | SCTP_INC_STATS(net, SCTP_MIB_IN_PKT_DISCARDS); |
1da177e4 LT |
4403 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
4404 | ||
4405 | return SCTP_DISPOSITION_CONSUME; | |
4406 | } | |
4407 | ||
4408 | ||
4409 | /* | |
4410 | * The other end is violating protocol. | |
4411 | * | |
4412 | * Section: Not specified | |
4413 | * Verification Tag: Not specified | |
4414 | * Inputs | |
4415 | * (endpoint, asoc, chunk) | |
4416 | * | |
4417 | * Outputs | |
4418 | * (asoc, reply_msg, msg_up, timers, counters) | |
4419 | * | |
4420 | * We simply tag the chunk as a violation. The state machine will log | |
4421 | * the violation and continue. | |
4422 | */ | |
172a1599 XL |
4423 | enum sctp_disposition sctp_sf_violation(struct net *net, |
4424 | const struct sctp_endpoint *ep, | |
4425 | const struct sctp_association *asoc, | |
4426 | const union sctp_subtype type, | |
4427 | void *arg, | |
4428 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4429 | { |
ece25dfa VY |
4430 | struct sctp_chunk *chunk = arg; |
4431 | ||
4432 | /* Make sure that the chunk has a valid length. */ | |
922dbc5b | 4433 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4434 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4435 | commands); |
4436 | ||
1da177e4 LT |
4437 | return SCTP_DISPOSITION_VIOLATION; |
4438 | } | |
4439 | ||
1da177e4 | 4440 | /* |
aecedeab | 4441 | * Common function to handle a protocol violation. |
1da177e4 | 4442 | */ |
172a1599 XL |
4443 | static enum sctp_disposition sctp_sf_abort_violation( |
4444 | struct net *net, | |
4445 | const struct sctp_endpoint *ep, | |
4446 | const struct sctp_association *asoc, | |
4447 | void *arg, | |
4448 | struct sctp_cmd_seq *commands, | |
4449 | const __u8 *payload, | |
4450 | const size_t paylen) | |
1da177e4 | 4451 | { |
ece25dfa | 4452 | struct sctp_packet *packet = NULL; |
1da177e4 LT |
4453 | struct sctp_chunk *chunk = arg; |
4454 | struct sctp_chunk *abort = NULL; | |
1da177e4 | 4455 | |
bbd0d598 VY |
4456 | /* SCTP-AUTH, Section 6.3: |
4457 | * It should be noted that if the receiver wants to tear | |
4458 | * down an association in an authenticated way only, the | |
4459 | * handling of malformed packets should not result in | |
4460 | * tearing down the association. | |
4461 | * | |
4462 | * This means that if we only want to abort associations | |
4463 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 4464 | * can't destroy this association just because the packet |
bbd0d598 VY |
4465 | * was malformed. |
4466 | */ | |
4467 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
4468 | goto discard; | |
4469 | ||
9abed245 JJ |
4470 | /* Make the abort chunk. */ |
4471 | abort = sctp_make_abort_violation(asoc, chunk, payload, paylen); | |
4472 | if (!abort) | |
4473 | goto nomem; | |
4474 | ||
ece25dfa | 4475 | if (asoc) { |
f4ad85ca GJ |
4476 | /* Treat INIT-ACK as a special case during COOKIE-WAIT. */ |
4477 | if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK && | |
4478 | !asoc->peer.i.init_tag) { | |
cb1844c4 | 4479 | struct sctp_initack_chunk *initack; |
f4ad85ca | 4480 | |
cb1844c4 XL |
4481 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
4482 | if (!sctp_chunk_length_valid(chunk, sizeof(*initack))) | |
f4ad85ca GJ |
4483 | abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T; |
4484 | else { | |
4485 | unsigned int inittag; | |
4486 | ||
4487 | inittag = ntohl(initack->init_hdr.init_tag); | |
4488 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG, | |
4489 | SCTP_U32(inittag)); | |
4490 | } | |
4491 | } | |
4492 | ||
ece25dfa | 4493 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
b01a2407 | 4494 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 4495 | |
ece25dfa VY |
4496 | if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) { |
4497 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
4498 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4499 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4500 | SCTP_ERROR(ECONNREFUSED)); | |
4501 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
4502 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
4503 | } else { | |
4504 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4505 | SCTP_ERROR(ECONNABORTED)); | |
4506 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4507 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 | 4508 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
ece25dfa | 4509 | } |
1da177e4 | 4510 | } else { |
2ce95503 | 4511 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
ece25dfa VY |
4512 | |
4513 | if (!packet) | |
4514 | goto nomem_pkt; | |
4515 | ||
4516 | if (sctp_test_T_bit(abort)) | |
4517 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
4518 | ||
4519 | abort->skb->sk = ep->base.sk; | |
4520 | ||
4521 | sctp_packet_append_chunk(packet, abort); | |
4522 | ||
4523 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
4524 | SCTP_PACKET(packet)); | |
4525 | ||
b01a2407 | 4526 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
4527 | } |
4528 | ||
b01a2407 | 4529 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
d808ad9a | 4530 | |
56eb82bb | 4531 | discard: |
24cb81a6 | 4532 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
1da177e4 LT |
4533 | return SCTP_DISPOSITION_ABORT; |
4534 | ||
ece25dfa VY |
4535 | nomem_pkt: |
4536 | sctp_chunk_free(abort); | |
1da177e4 LT |
4537 | nomem: |
4538 | return SCTP_DISPOSITION_NOMEM; | |
4539 | } | |
4540 | ||
aecedeab WY |
4541 | /* |
4542 | * Handle a protocol violation when the chunk length is invalid. | |
025dfdaf | 4543 | * "Invalid" length is identified as smaller than the minimal length a |
aecedeab | 4544 | * given chunk can be. For example, a SACK chunk has invalid length |
d4d6c614 | 4545 | * if its length is set to be smaller than the size of struct sctp_sack_chunk. |
aecedeab WY |
4546 | * |
4547 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4548 | * error code. | |
4549 | * | |
4550 | * Section: Not specified | |
4551 | * Verification Tag: Nothing to do | |
4552 | * Inputs | |
4553 | * (endpoint, asoc, chunk) | |
4554 | * | |
4555 | * Outputs | |
4556 | * (reply_msg, msg_up, counters) | |
4557 | * | |
4558 | * Generate an ABORT chunk and terminate the association. | |
4559 | */ | |
172a1599 XL |
4560 | static enum sctp_disposition sctp_sf_violation_chunklen( |
4561 | struct net *net, | |
4562 | const struct sctp_endpoint *ep, | |
4563 | const struct sctp_association *asoc, | |
4564 | const union sctp_subtype type, | |
4565 | void *arg, | |
4566 | struct sctp_cmd_seq *commands) | |
aecedeab | 4567 | { |
cb3f837b | 4568 | static const char err_str[] = "The following chunk had invalid length:"; |
aecedeab | 4569 | |
24cb81a6 | 4570 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4571 | sizeof(err_str)); |
aecedeab WY |
4572 | } |
4573 | ||
6f4c618d WY |
4574 | /* |
4575 | * Handle a protocol violation when the parameter length is invalid. | |
33c7cfdb SW |
4576 | * If the length is smaller than the minimum length of a given parameter, |
4577 | * or accumulated length in multi parameters exceeds the end of the chunk, | |
4578 | * the length is considered as invalid. | |
6f4c618d | 4579 | */ |
172a1599 XL |
4580 | static enum sctp_disposition sctp_sf_violation_paramlen( |
4581 | struct net *net, | |
4582 | const struct sctp_endpoint *ep, | |
4583 | const struct sctp_association *asoc, | |
4584 | const union sctp_subtype type, | |
4585 | void *arg, void *ext, | |
4586 | struct sctp_cmd_seq *commands) | |
ba016670 | 4587 | { |
ba016670 WY |
4588 | struct sctp_paramhdr *param = ext; |
4589 | struct sctp_chunk *abort = NULL; | |
172a1599 | 4590 | struct sctp_chunk *chunk = arg; |
6f4c618d | 4591 | |
ba016670 WY |
4592 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) |
4593 | goto discard; | |
4594 | ||
4595 | /* Make the abort chunk. */ | |
4596 | abort = sctp_make_violation_paramlen(asoc, chunk, param); | |
4597 | if (!abort) | |
4598 | goto nomem; | |
4599 | ||
4600 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
b01a2407 | 4601 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
ba016670 WY |
4602 | |
4603 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4604 | SCTP_ERROR(ECONNABORTED)); | |
4605 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4606 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 EB |
4607 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
4608 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
ba016670 WY |
4609 | |
4610 | discard: | |
24cb81a6 | 4611 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
ba016670 WY |
4612 | return SCTP_DISPOSITION_ABORT; |
4613 | nomem: | |
4614 | return SCTP_DISPOSITION_NOMEM; | |
6f4c618d WY |
4615 | } |
4616 | ||
aecedeab WY |
4617 | /* Handle a protocol violation when the peer trying to advance the |
4618 | * cumulative tsn ack to a point beyond the max tsn currently sent. | |
4619 | * | |
4620 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4621 | * error code. | |
4622 | */ | |
172a1599 XL |
4623 | static enum sctp_disposition sctp_sf_violation_ctsn( |
4624 | struct net *net, | |
4625 | const struct sctp_endpoint *ep, | |
4626 | const struct sctp_association *asoc, | |
4627 | const union sctp_subtype type, | |
4628 | void *arg, | |
4629 | struct sctp_cmd_seq *commands) | |
aecedeab | 4630 | { |
cb3f837b | 4631 | static const char err_str[] = "The cumulative tsn ack beyond the max tsn currently sent:"; |
aecedeab | 4632 | |
24cb81a6 | 4633 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4634 | sizeof(err_str)); |
aecedeab WY |
4635 | } |
4636 | ||
ece25dfa | 4637 | /* Handle protocol violation of an invalid chunk bundling. For example, |
25985edc | 4638 | * when we have an association and we receive bundled INIT-ACK, or |
ece25dfa | 4639 | * SHUDOWN-COMPLETE, our peer is clearly violationg the "MUST NOT bundle" |
25985edc | 4640 | * statement from the specs. Additionally, there might be an attacker |
ece25dfa VY |
4641 | * on the path and we may not want to continue this communication. |
4642 | */ | |
172a1599 XL |
4643 | static enum sctp_disposition sctp_sf_violation_chunk( |
4644 | struct net *net, | |
4645 | const struct sctp_endpoint *ep, | |
4646 | const struct sctp_association *asoc, | |
4647 | const union sctp_subtype type, | |
4648 | void *arg, | |
4649 | struct sctp_cmd_seq *commands) | |
ece25dfa | 4650 | { |
cb3f837b | 4651 | static const char err_str[] = "The following chunk violates protocol:"; |
ece25dfa VY |
4652 | |
4653 | if (!asoc) | |
24cb81a6 | 4654 | return sctp_sf_violation(net, ep, asoc, type, arg, commands); |
ece25dfa | 4655 | |
24cb81a6 | 4656 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4657 | sizeof(err_str)); |
ece25dfa | 4658 | } |
1da177e4 LT |
4659 | /*************************************************************************** |
4660 | * These are the state functions for handling primitive (Section 10) events. | |
4661 | ***************************************************************************/ | |
4662 | /* | |
4663 | * sctp_sf_do_prm_asoc | |
4664 | * | |
4665 | * Section: 10.1 ULP-to-SCTP | |
4666 | * B) Associate | |
4667 | * | |
4668 | * Format: ASSOCIATE(local SCTP instance name, destination transport addr, | |
4669 | * outbound stream count) | |
4670 | * -> association id [,destination transport addr list] [,outbound stream | |
4671 | * count] | |
4672 | * | |
4673 | * This primitive allows the upper layer to initiate an association to a | |
4674 | * specific peer endpoint. | |
4675 | * | |
4676 | * The peer endpoint shall be specified by one of the transport addresses | |
4677 | * which defines the endpoint (see Section 1.4). If the local SCTP | |
4678 | * instance has not been initialized, the ASSOCIATE is considered an | |
4679 | * error. | |
4680 | * [This is not relevant for the kernel implementation since we do all | |
4681 | * initialization at boot time. It we hadn't initialized we wouldn't | |
4682 | * get anywhere near this code.] | |
4683 | * | |
4684 | * An association id, which is a local handle to the SCTP association, | |
4685 | * will be returned on successful establishment of the association. If | |
4686 | * SCTP is not able to open an SCTP association with the peer endpoint, | |
4687 | * an error is returned. | |
4688 | * [In the kernel implementation, the struct sctp_association needs to | |
4689 | * be created BEFORE causing this primitive to run.] | |
4690 | * | |
4691 | * Other association parameters may be returned, including the | |
4692 | * complete destination transport addresses of the peer as well as the | |
4693 | * outbound stream count of the local endpoint. One of the transport | |
4694 | * address from the returned destination addresses will be selected by | |
4695 | * the local endpoint as default primary path for sending SCTP packets | |
4696 | * to this peer. The returned "destination transport addr list" can | |
4697 | * be used by the ULP to change the default primary path or to force | |
4698 | * sending a packet to a specific transport address. [All of this | |
4699 | * stuff happens when the INIT ACK arrives. This is a NON-BLOCKING | |
4700 | * function.] | |
4701 | * | |
4702 | * Mandatory attributes: | |
4703 | * | |
4704 | * o local SCTP instance name - obtained from the INITIALIZE operation. | |
4705 | * [This is the argument asoc.] | |
4706 | * o destination transport addr - specified as one of the transport | |
4707 | * addresses of the peer endpoint with which the association is to be | |
4708 | * established. | |
4709 | * [This is asoc->peer.active_path.] | |
4710 | * o outbound stream count - the number of outbound streams the ULP | |
4711 | * would like to open towards this peer endpoint. | |
4712 | * [BUG: This is not currently implemented.] | |
4713 | * Optional attributes: | |
4714 | * | |
4715 | * None. | |
4716 | * | |
4717 | * The return value is a disposition. | |
4718 | */ | |
172a1599 XL |
4719 | enum sctp_disposition sctp_sf_do_prm_asoc(struct net *net, |
4720 | const struct sctp_endpoint *ep, | |
4721 | const struct sctp_association *asoc, | |
4722 | const union sctp_subtype type, | |
4723 | void *arg, | |
4724 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4725 | { |
26ac8e5f | 4726 | struct sctp_association *my_asoc; |
172a1599 | 4727 | struct sctp_chunk *repl; |
1da177e4 LT |
4728 | |
4729 | /* The comment below says that we enter COOKIE-WAIT AFTER | |
4730 | * sending the INIT, but that doesn't actually work in our | |
4731 | * implementation... | |
4732 | */ | |
4733 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4734 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
4735 | ||
4736 | /* RFC 2960 5.1 Normal Establishment of an Association | |
4737 | * | |
4738 | * A) "A" first sends an INIT chunk to "Z". In the INIT, "A" | |
4739 | * must provide its Verification Tag (Tag_A) in the Initiate | |
4740 | * Tag field. Tag_A SHOULD be a random number in the range of | |
4741 | * 1 to 4294967295 (see 5.3.1 for Tag value selection). ... | |
4742 | */ | |
4743 | ||
4744 | repl = sctp_make_init(asoc, &asoc->base.bind_addr, GFP_ATOMIC, 0); | |
4745 | if (!repl) | |
4746 | goto nomem; | |
4747 | ||
405426f6 DB |
4748 | /* Choose transport for INIT. */ |
4749 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
4750 | SCTP_CHUNK(repl)); | |
4751 | ||
1da177e4 LT |
4752 | /* Cast away the const modifier, as we want to just |
4753 | * rerun it through as a sideffect. | |
4754 | */ | |
ab38fb04 VY |
4755 | my_asoc = (struct sctp_association *)asoc; |
4756 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(my_asoc)); | |
1da177e4 LT |
4757 | |
4758 | /* After sending the INIT, "A" starts the T1-init timer and | |
4759 | * enters the COOKIE-WAIT state. | |
4760 | */ | |
4761 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
4762 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4763 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
4764 | return SCTP_DISPOSITION_CONSUME; | |
4765 | ||
4766 | nomem: | |
4767 | return SCTP_DISPOSITION_NOMEM; | |
4768 | } | |
4769 | ||
4770 | /* | |
4771 | * Process the SEND primitive. | |
4772 | * | |
4773 | * Section: 10.1 ULP-to-SCTP | |
4774 | * E) Send | |
4775 | * | |
4776 | * Format: SEND(association id, buffer address, byte count [,context] | |
4777 | * [,stream id] [,life time] [,destination transport address] | |
4778 | * [,unorder flag] [,no-bundle flag] [,payload protocol-id] ) | |
4779 | * -> result | |
4780 | * | |
4781 | * This is the main method to send user data via SCTP. | |
4782 | * | |
4783 | * Mandatory attributes: | |
4784 | * | |
4785 | * o association id - local handle to the SCTP association | |
4786 | * | |
4787 | * o buffer address - the location where the user message to be | |
4788 | * transmitted is stored; | |
4789 | * | |
4790 | * o byte count - The size of the user data in number of bytes; | |
4791 | * | |
4792 | * Optional attributes: | |
4793 | * | |
4794 | * o context - an optional 32 bit integer that will be carried in the | |
4795 | * sending failure notification to the ULP if the transportation of | |
4796 | * this User Message fails. | |
4797 | * | |
4798 | * o stream id - to indicate which stream to send the data on. If not | |
4799 | * specified, stream 0 will be used. | |
4800 | * | |
4801 | * o life time - specifies the life time of the user data. The user data | |
4802 | * will not be sent by SCTP after the life time expires. This | |
4803 | * parameter can be used to avoid efforts to transmit stale | |
4804 | * user messages. SCTP notifies the ULP if the data cannot be | |
4805 | * initiated to transport (i.e. sent to the destination via SCTP's | |
4806 | * send primitive) within the life time variable. However, the | |
4807 | * user data will be transmitted if SCTP has attempted to transmit a | |
4808 | * chunk before the life time expired. | |
4809 | * | |
4810 | * o destination transport address - specified as one of the destination | |
4811 | * transport addresses of the peer endpoint to which this packet | |
4812 | * should be sent. Whenever possible, SCTP should use this destination | |
4813 | * transport address for sending the packets, instead of the current | |
4814 | * primary path. | |
4815 | * | |
4816 | * o unorder flag - this flag, if present, indicates that the user | |
4817 | * would like the data delivered in an unordered fashion to the peer | |
4818 | * (i.e., the U flag is set to 1 on all DATA chunks carrying this | |
4819 | * message). | |
4820 | * | |
4821 | * o no-bundle flag - instructs SCTP not to bundle this user data with | |
4822 | * other outbound DATA chunks. SCTP MAY still bundle even when | |
4823 | * this flag is present, when faced with network congestion. | |
4824 | * | |
4825 | * o payload protocol-id - A 32 bit unsigned integer that is to be | |
4826 | * passed to the peer indicating the type of payload protocol data | |
4827 | * being transmitted. This value is passed as opaque data by SCTP. | |
4828 | * | |
4829 | * The return value is the disposition. | |
4830 | */ | |
172a1599 XL |
4831 | enum sctp_disposition sctp_sf_do_prm_send(struct net *net, |
4832 | const struct sctp_endpoint *ep, | |
4833 | const struct sctp_association *asoc, | |
4834 | const union sctp_subtype type, | |
4835 | void *arg, | |
4836 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4837 | { |
9c5c62be | 4838 | struct sctp_datamsg *msg = arg; |
1da177e4 | 4839 | |
9c5c62be | 4840 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_MSG, SCTP_DATAMSG(msg)); |
1da177e4 LT |
4841 | return SCTP_DISPOSITION_CONSUME; |
4842 | } | |
4843 | ||
4844 | /* | |
4845 | * Process the SHUTDOWN primitive. | |
4846 | * | |
4847 | * Section: 10.1: | |
4848 | * C) Shutdown | |
4849 | * | |
4850 | * Format: SHUTDOWN(association id) | |
4851 | * -> result | |
4852 | * | |
4853 | * Gracefully closes an association. Any locally queued user data | |
4854 | * will be delivered to the peer. The association will be terminated only | |
4855 | * after the peer acknowledges all the SCTP packets sent. A success code | |
4856 | * will be returned on successful termination of the association. If | |
4857 | * attempting to terminate the association results in a failure, an error | |
4858 | * code shall be returned. | |
4859 | * | |
4860 | * Mandatory attributes: | |
4861 | * | |
4862 | * o association id - local handle to the SCTP association | |
4863 | * | |
4864 | * Optional attributes: | |
4865 | * | |
4866 | * None. | |
4867 | * | |
4868 | * The return value is the disposition. | |
4869 | */ | |
172a1599 XL |
4870 | enum sctp_disposition sctp_sf_do_9_2_prm_shutdown( |
4871 | struct net *net, | |
4872 | const struct sctp_endpoint *ep, | |
4873 | const struct sctp_association *asoc, | |
4874 | const union sctp_subtype type, | |
4875 | void *arg, | |
4876 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4877 | { |
172a1599 | 4878 | enum sctp_disposition disposition; |
1da177e4 LT |
4879 | |
4880 | /* From 9.2 Shutdown of an Association | |
4881 | * Upon receipt of the SHUTDOWN primitive from its upper | |
4882 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
4883 | * remains there until all outstanding data has been | |
4884 | * acknowledged by its peer. The endpoint accepts no new data | |
4885 | * from its upper layer, but retransmits data to the far end | |
4886 | * if necessary to fill gaps. | |
4887 | */ | |
4888 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4889 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
4890 | ||
1da177e4 LT |
4891 | disposition = SCTP_DISPOSITION_CONSUME; |
4892 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 4893 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
4894 | arg, commands); |
4895 | } | |
172a1599 | 4896 | |
1da177e4 LT |
4897 | return disposition; |
4898 | } | |
4899 | ||
4900 | /* | |
4901 | * Process the ABORT primitive. | |
4902 | * | |
4903 | * Section: 10.1: | |
4904 | * C) Abort | |
4905 | * | |
4906 | * Format: Abort(association id [, cause code]) | |
4907 | * -> result | |
4908 | * | |
4909 | * Ungracefully closes an association. Any locally queued user data | |
4910 | * will be discarded and an ABORT chunk is sent to the peer. A success code | |
4911 | * will be returned on successful abortion of the association. If | |
4912 | * attempting to abort the association results in a failure, an error | |
4913 | * code shall be returned. | |
4914 | * | |
4915 | * Mandatory attributes: | |
4916 | * | |
4917 | * o association id - local handle to the SCTP association | |
4918 | * | |
4919 | * Optional attributes: | |
4920 | * | |
4921 | * o cause code - reason of the abort to be passed to the peer | |
4922 | * | |
4923 | * None. | |
4924 | * | |
4925 | * The return value is the disposition. | |
4926 | */ | |
172a1599 XL |
4927 | enum sctp_disposition sctp_sf_do_9_1_prm_abort( |
4928 | struct net *net, | |
4929 | const struct sctp_endpoint *ep, | |
4930 | const struct sctp_association *asoc, | |
4931 | const union sctp_subtype type, | |
4932 | void *arg, | |
4933 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4934 | { |
4935 | /* From 9.1 Abort of an Association | |
4936 | * Upon receipt of the ABORT primitive from its upper | |
4937 | * layer, the endpoint enters CLOSED state and | |
4938 | * discard all outstanding data has been | |
4939 | * acknowledged by its peer. The endpoint accepts no new data | |
4940 | * from its upper layer, but retransmits data to the far end | |
4941 | * if necessary to fill gaps. | |
4942 | */ | |
c164a9ba | 4943 | struct sctp_chunk *abort = arg; |
1da177e4 | 4944 | |
068d8bd3 XL |
4945 | if (abort) |
4946 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
4947 | |
4948 | /* Even if we can't send the ABORT due to low memory delete the | |
4949 | * TCB. This is a departure from our typical NOMEM handling. | |
4950 | */ | |
4951 | ||
8de8c873 SS |
4952 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
4953 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 LT |
4954 | /* Delete the established association. */ |
4955 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 4956 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 4957 | |
b01a2407 EB |
4958 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
4959 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 | 4960 | |
649621e3 | 4961 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
4962 | } |
4963 | ||
4964 | /* We tried an illegal operation on an association which is closed. */ | |
172a1599 XL |
4965 | enum sctp_disposition sctp_sf_error_closed(struct net *net, |
4966 | const struct sctp_endpoint *ep, | |
4967 | const struct sctp_association *asoc, | |
4968 | const union sctp_subtype type, | |
4969 | void *arg, | |
4970 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4971 | { |
4972 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, SCTP_ERROR(-EINVAL)); | |
4973 | return SCTP_DISPOSITION_CONSUME; | |
4974 | } | |
4975 | ||
4976 | /* We tried an illegal operation on an association which is shutting | |
4977 | * down. | |
4978 | */ | |
172a1599 XL |
4979 | enum sctp_disposition sctp_sf_error_shutdown( |
4980 | struct net *net, | |
4981 | const struct sctp_endpoint *ep, | |
4982 | const struct sctp_association *asoc, | |
4983 | const union sctp_subtype type, | |
4984 | void *arg, | |
4985 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4986 | { |
4987 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, | |
4988 | SCTP_ERROR(-ESHUTDOWN)); | |
4989 | return SCTP_DISPOSITION_CONSUME; | |
4990 | } | |
4991 | ||
4992 | /* | |
4993 | * sctp_cookie_wait_prm_shutdown | |
4994 | * | |
4995 | * Section: 4 Note: 2 | |
4996 | * Verification Tag: | |
4997 | * Inputs | |
4998 | * (endpoint, asoc) | |
4999 | * | |
5000 | * The RFC does not explicitly address this issue, but is the route through the | |
5001 | * state table when someone issues a shutdown while in COOKIE_WAIT state. | |
5002 | * | |
5003 | * Outputs | |
5004 | * (timers) | |
5005 | */ | |
172a1599 XL |
5006 | enum sctp_disposition sctp_sf_cookie_wait_prm_shutdown( |
5007 | struct net *net, | |
5008 | const struct sctp_endpoint *ep, | |
5009 | const struct sctp_association *asoc, | |
5010 | const union sctp_subtype type, | |
5011 | void *arg, | |
5012 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5013 | { |
5014 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5015 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5016 | ||
5017 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5018 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5019 | ||
b01a2407 | 5020 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
1da177e4 LT |
5021 | |
5022 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
5023 | ||
5024 | return SCTP_DISPOSITION_DELETE_TCB; | |
5025 | } | |
5026 | ||
5027 | /* | |
5028 | * sctp_cookie_echoed_prm_shutdown | |
5029 | * | |
5030 | * Section: 4 Note: 2 | |
5031 | * Verification Tag: | |
5032 | * Inputs | |
5033 | * (endpoint, asoc) | |
5034 | * | |
5035 | * The RFC does not explcitly address this issue, but is the route through the | |
5036 | * state table when someone issues a shutdown while in COOKIE_ECHOED state. | |
5037 | * | |
5038 | * Outputs | |
5039 | * (timers) | |
5040 | */ | |
172a1599 XL |
5041 | enum sctp_disposition sctp_sf_cookie_echoed_prm_shutdown( |
5042 | struct net *net, | |
5043 | const struct sctp_endpoint *ep, | |
5044 | const struct sctp_association *asoc, | |
5045 | const union sctp_subtype type, | |
5046 | void *arg, | |
5047 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5048 | { |
5049 | /* There is a single T1 timer, so we should be able to use | |
5050 | * common function with the COOKIE-WAIT state. | |
5051 | */ | |
24cb81a6 | 5052 | return sctp_sf_cookie_wait_prm_shutdown(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5053 | } |
5054 | ||
5055 | /* | |
5056 | * sctp_sf_cookie_wait_prm_abort | |
5057 | * | |
5058 | * Section: 4 Note: 2 | |
5059 | * Verification Tag: | |
5060 | * Inputs | |
5061 | * (endpoint, asoc) | |
5062 | * | |
5063 | * The RFC does not explicitly address this issue, but is the route through the | |
5064 | * state table when someone issues an abort while in COOKIE_WAIT state. | |
5065 | * | |
5066 | * Outputs | |
5067 | * (timers) | |
5068 | */ | |
172a1599 XL |
5069 | enum sctp_disposition sctp_sf_cookie_wait_prm_abort( |
5070 | struct net *net, | |
5071 | const struct sctp_endpoint *ep, | |
5072 | const struct sctp_association *asoc, | |
5073 | const union sctp_subtype type, | |
5074 | void *arg, | |
5075 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5076 | { |
c164a9ba | 5077 | struct sctp_chunk *abort = arg; |
1da177e4 LT |
5078 | |
5079 | /* Stop T1-init timer */ | |
5080 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5081 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1da177e4 | 5082 | |
068d8bd3 XL |
5083 | if (abort) |
5084 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5085 | |
5086 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5087 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5088 | ||
b01a2407 | 5089 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
5090 | |
5091 | /* Even if we can't send the ABORT due to low memory delete the | |
5092 | * TCB. This is a departure from our typical NOMEM handling. | |
5093 | */ | |
5094 | ||
8de8c873 SS |
5095 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5096 | SCTP_ERROR(ECONNREFUSED)); | |
1da177e4 LT |
5097 | /* Delete the established association. */ |
5098 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 5099 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5100 | |
649621e3 | 5101 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5102 | } |
5103 | ||
5104 | /* | |
5105 | * sctp_sf_cookie_echoed_prm_abort | |
5106 | * | |
5107 | * Section: 4 Note: 3 | |
5108 | * Verification Tag: | |
5109 | * Inputs | |
5110 | * (endpoint, asoc) | |
5111 | * | |
5112 | * The RFC does not explcitly address this issue, but is the route through the | |
5113 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5114 | * | |
5115 | * Outputs | |
5116 | * (timers) | |
5117 | */ | |
172a1599 XL |
5118 | enum sctp_disposition sctp_sf_cookie_echoed_prm_abort( |
5119 | struct net *net, | |
5120 | const struct sctp_endpoint *ep, | |
5121 | const struct sctp_association *asoc, | |
5122 | const union sctp_subtype type, | |
5123 | void *arg, | |
5124 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5125 | { |
5126 | /* There is a single T1 timer, so we should be able to use | |
5127 | * common function with the COOKIE-WAIT state. | |
5128 | */ | |
24cb81a6 | 5129 | return sctp_sf_cookie_wait_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5130 | } |
5131 | ||
5132 | /* | |
5133 | * sctp_sf_shutdown_pending_prm_abort | |
5134 | * | |
5135 | * Inputs | |
5136 | * (endpoint, asoc) | |
5137 | * | |
5138 | * The RFC does not explicitly address this issue, but is the route through the | |
5139 | * state table when someone issues an abort while in SHUTDOWN-PENDING state. | |
5140 | * | |
5141 | * Outputs | |
5142 | * (timers) | |
5143 | */ | |
172a1599 XL |
5144 | enum sctp_disposition sctp_sf_shutdown_pending_prm_abort( |
5145 | struct net *net, | |
5146 | const struct sctp_endpoint *ep, | |
5147 | const struct sctp_association *asoc, | |
5148 | const union sctp_subtype type, | |
5149 | void *arg, | |
5150 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5151 | { |
5152 | /* Stop the T5-shutdown guard timer. */ | |
5153 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5154 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5155 | ||
24cb81a6 | 5156 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5157 | } |
5158 | ||
5159 | /* | |
5160 | * sctp_sf_shutdown_sent_prm_abort | |
5161 | * | |
5162 | * Inputs | |
5163 | * (endpoint, asoc) | |
5164 | * | |
5165 | * The RFC does not explicitly address this issue, but is the route through the | |
5166 | * state table when someone issues an abort while in SHUTDOWN-SENT state. | |
5167 | * | |
5168 | * Outputs | |
5169 | * (timers) | |
5170 | */ | |
172a1599 XL |
5171 | enum sctp_disposition sctp_sf_shutdown_sent_prm_abort( |
5172 | struct net *net, | |
5173 | const struct sctp_endpoint *ep, | |
5174 | const struct sctp_association *asoc, | |
5175 | const union sctp_subtype type, | |
5176 | void *arg, | |
5177 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5178 | { |
5179 | /* Stop the T2-shutdown timer. */ | |
5180 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5181 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5182 | ||
5183 | /* Stop the T5-shutdown guard timer. */ | |
5184 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5185 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5186 | ||
24cb81a6 | 5187 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5188 | } |
5189 | ||
5190 | /* | |
5191 | * sctp_sf_cookie_echoed_prm_abort | |
5192 | * | |
5193 | * Inputs | |
5194 | * (endpoint, asoc) | |
5195 | * | |
5196 | * The RFC does not explcitly address this issue, but is the route through the | |
5197 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5198 | * | |
5199 | * Outputs | |
5200 | * (timers) | |
5201 | */ | |
172a1599 XL |
5202 | enum sctp_disposition sctp_sf_shutdown_ack_sent_prm_abort( |
5203 | struct net *net, | |
5204 | const struct sctp_endpoint *ep, | |
5205 | const struct sctp_association *asoc, | |
5206 | const union sctp_subtype type, | |
5207 | void *arg, | |
5208 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5209 | { |
5210 | /* The same T2 timer, so we should be able to use | |
5211 | * common function with the SHUTDOWN-SENT state. | |
5212 | */ | |
24cb81a6 | 5213 | return sctp_sf_shutdown_sent_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5214 | } |
5215 | ||
5216 | /* | |
5217 | * Process the REQUESTHEARTBEAT primitive | |
5218 | * | |
5219 | * 10.1 ULP-to-SCTP | |
5220 | * J) Request Heartbeat | |
5221 | * | |
5222 | * Format: REQUESTHEARTBEAT(association id, destination transport address) | |
5223 | * | |
5224 | * -> result | |
5225 | * | |
5226 | * Instructs the local endpoint to perform a HeartBeat on the specified | |
5227 | * destination transport address of the given association. The returned | |
5228 | * result should indicate whether the transmission of the HEARTBEAT | |
5229 | * chunk to the destination address is successful. | |
5230 | * | |
5231 | * Mandatory attributes: | |
5232 | * | |
5233 | * o association id - local handle to the SCTP association | |
5234 | * | |
5235 | * o destination transport address - the transport address of the | |
5236 | * association on which a heartbeat should be issued. | |
5237 | */ | |
172a1599 | 5238 | enum sctp_disposition sctp_sf_do_prm_requestheartbeat( |
24cb81a6 | 5239 | struct net *net, |
1da177e4 LT |
5240 | const struct sctp_endpoint *ep, |
5241 | const struct sctp_association *asoc, | |
bfc6f827 | 5242 | const union sctp_subtype type, |
1da177e4 | 5243 | void *arg, |
a85bbeb2 | 5244 | struct sctp_cmd_seq *commands) |
1da177e4 | 5245 | { |
fb78525a VY |
5246 | if (SCTP_DISPOSITION_NOMEM == sctp_sf_heartbeat(ep, asoc, type, |
5247 | (struct sctp_transport *)arg, commands)) | |
5248 | return SCTP_DISPOSITION_NOMEM; | |
5249 | ||
5250 | /* | |
5251 | * RFC 2960 (bis), section 8.3 | |
5252 | * | |
5253 | * D) Request an on-demand HEARTBEAT on a specific destination | |
5254 | * transport address of a given association. | |
5255 | * | |
5256 | * The endpoint should increment the respective error counter of | |
5257 | * the destination transport address each time a HEARTBEAT is sent | |
5258 | * to that address and not acknowledged within one RTO. | |
5259 | * | |
5260 | */ | |
7e99013a | 5261 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
fb78525a VY |
5262 | SCTP_TRANSPORT(arg)); |
5263 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5264 | } |
5265 | ||
5266 | /* | |
5267 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
5268 | * When an endpoint has an ASCONF signaled change to be sent to the | |
5269 | * remote endpoint it should do A1 to A9 | |
5270 | */ | |
172a1599 XL |
5271 | enum sctp_disposition sctp_sf_do_prm_asconf(struct net *net, |
5272 | const struct sctp_endpoint *ep, | |
5273 | const struct sctp_association *asoc, | |
5274 | const union sctp_subtype type, | |
5275 | void *arg, | |
5276 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5277 | { |
5278 | struct sctp_chunk *chunk = arg; | |
5279 | ||
5280 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5281 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5282 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5283 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5284 | return SCTP_DISPOSITION_CONSUME; | |
5285 | } | |
5286 | ||
7a090b04 | 5287 | /* RE-CONFIG Section 5.1 RECONF Chunk Procedures */ |
172a1599 XL |
5288 | enum sctp_disposition sctp_sf_do_prm_reconf(struct net *net, |
5289 | const struct sctp_endpoint *ep, | |
5290 | const struct sctp_association *asoc, | |
5291 | const union sctp_subtype type, | |
5292 | void *arg, | |
5293 | struct sctp_cmd_seq *commands) | |
7a090b04 XL |
5294 | { |
5295 | struct sctp_chunk *chunk = arg; | |
5296 | ||
5297 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5298 | return SCTP_DISPOSITION_CONSUME; | |
5299 | } | |
5300 | ||
1da177e4 LT |
5301 | /* |
5302 | * Ignore the primitive event | |
5303 | * | |
5304 | * The return value is the disposition of the primitive. | |
5305 | */ | |
172a1599 XL |
5306 | enum sctp_disposition sctp_sf_ignore_primitive( |
5307 | struct net *net, | |
5308 | const struct sctp_endpoint *ep, | |
5309 | const struct sctp_association *asoc, | |
5310 | const union sctp_subtype type, | |
5311 | void *arg, | |
5312 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5313 | { |
bb33381d DB |
5314 | pr_debug("%s: primitive type:%d is ignored\n", __func__, |
5315 | type.primitive); | |
5316 | ||
1da177e4 LT |
5317 | return SCTP_DISPOSITION_DISCARD; |
5318 | } | |
5319 | ||
5320 | /*************************************************************************** | |
5321 | * These are the state functions for the OTHER events. | |
5322 | ***************************************************************************/ | |
5323 | ||
e1cdd553 WY |
5324 | /* |
5325 | * When the SCTP stack has no more user data to send or retransmit, this | |
5326 | * notification is given to the user. Also, at the time when a user app | |
5327 | * subscribes to this event, if there is no data to be sent or | |
5328 | * retransmit, the stack will immediately send up this notification. | |
5329 | */ | |
172a1599 XL |
5330 | enum sctp_disposition sctp_sf_do_no_pending_tsn( |
5331 | struct net *net, | |
5332 | const struct sctp_endpoint *ep, | |
5333 | const struct sctp_association *asoc, | |
5334 | const union sctp_subtype type, | |
5335 | void *arg, | |
5336 | struct sctp_cmd_seq *commands) | |
e1cdd553 WY |
5337 | { |
5338 | struct sctp_ulpevent *event; | |
5339 | ||
5340 | event = sctp_ulpevent_make_sender_dry_event(asoc, GFP_ATOMIC); | |
5341 | if (!event) | |
5342 | return SCTP_DISPOSITION_NOMEM; | |
5343 | ||
5344 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(event)); | |
5345 | ||
5346 | return SCTP_DISPOSITION_CONSUME; | |
5347 | } | |
5348 | ||
1da177e4 LT |
5349 | /* |
5350 | * Start the shutdown negotiation. | |
5351 | * | |
5352 | * From Section 9.2: | |
5353 | * Once all its outstanding data has been acknowledged, the endpoint | |
5354 | * shall send a SHUTDOWN chunk to its peer including in the Cumulative | |
5355 | * TSN Ack field the last sequential TSN it has received from the peer. | |
5356 | * It shall then start the T2-shutdown timer and enter the SHUTDOWN-SENT | |
5357 | * state. If the timer expires, the endpoint must re-send the SHUTDOWN | |
5358 | * with the updated last sequential TSN received from its peer. | |
5359 | * | |
5360 | * The return value is the disposition. | |
5361 | */ | |
172a1599 XL |
5362 | enum sctp_disposition sctp_sf_do_9_2_start_shutdown( |
5363 | struct net *net, | |
5364 | const struct sctp_endpoint *ep, | |
5365 | const struct sctp_association *asoc, | |
5366 | const union sctp_subtype type, | |
5367 | void *arg, | |
5368 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5369 | { |
5370 | struct sctp_chunk *reply; | |
5371 | ||
5372 | /* Once all its outstanding data has been acknowledged, the | |
5373 | * endpoint shall send a SHUTDOWN chunk to its peer including | |
5374 | * in the Cumulative TSN Ack field the last sequential TSN it | |
5375 | * has received from the peer. | |
5376 | */ | |
5377 | reply = sctp_make_shutdown(asoc, NULL); | |
5378 | if (!reply) | |
5379 | goto nomem; | |
5380 | ||
5381 | /* Set the transport for the SHUTDOWN chunk and the timeout for the | |
5382 | * T2-shutdown timer. | |
5383 | */ | |
5384 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5385 | ||
5386 | /* It shall then start the T2-shutdown timer */ | |
5387 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5388 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5389 | ||
536428a9 WY |
5390 | /* RFC 4960 Section 9.2 |
5391 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5392 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5393 | */ | |
f8d96052 | 5394 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
536428a9 WY |
5395 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
5396 | ||
9f70f46b | 5397 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5398 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5399 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5400 | ||
5401 | /* and enter the SHUTDOWN-SENT state. */ | |
5402 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5403 | SCTP_STATE(SCTP_STATE_SHUTDOWN_SENT)); | |
5404 | ||
5405 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5406 | * | |
5407 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5408 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5409 | */ |
5410 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5411 | ||
5412 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5413 | ||
5414 | return SCTP_DISPOSITION_CONSUME; | |
5415 | ||
5416 | nomem: | |
5417 | return SCTP_DISPOSITION_NOMEM; | |
5418 | } | |
5419 | ||
5420 | /* | |
5421 | * Generate a SHUTDOWN ACK now that everything is SACK'd. | |
5422 | * | |
5423 | * From Section 9.2: | |
5424 | * | |
5425 | * If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5426 | * shall send a SHUTDOWN ACK and start a T2-shutdown timer of its own, | |
5427 | * entering the SHUTDOWN-ACK-SENT state. If the timer expires, the | |
5428 | * endpoint must re-send the SHUTDOWN ACK. | |
5429 | * | |
5430 | * The return value is the disposition. | |
5431 | */ | |
172a1599 XL |
5432 | enum sctp_disposition sctp_sf_do_9_2_shutdown_ack( |
5433 | struct net *net, | |
5434 | const struct sctp_endpoint *ep, | |
5435 | const struct sctp_association *asoc, | |
5436 | const union sctp_subtype type, | |
5437 | void *arg, | |
5438 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5439 | { |
172a1599 | 5440 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
5441 | struct sctp_chunk *reply; |
5442 | ||
5443 | /* There are 2 ways of getting here: | |
5444 | * 1) called in response to a SHUTDOWN chunk | |
5445 | * 2) called when SCTP_EVENT_NO_PENDING_TSN event is issued. | |
5446 | * | |
5447 | * For the case (2), the arg parameter is set to NULL. We need | |
5448 | * to check that we have a chunk before accessing it's fields. | |
5449 | */ | |
5450 | if (chunk) { | |
5451 | if (!sctp_vtag_verify(chunk, asoc)) | |
ac23e681 XL |
5452 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
5453 | commands); | |
1da177e4 LT |
5454 | |
5455 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 XL |
5456 | if (!sctp_chunk_length_valid( |
5457 | chunk, sizeof(struct sctp_shutdown_chunk))) | |
5458 | return sctp_sf_violation_chunklen(net, ep, asoc, type, | |
5459 | arg, commands); | |
1da177e4 LT |
5460 | } |
5461 | ||
5462 | /* If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5463 | * shall send a SHUTDOWN ACK ... | |
5464 | */ | |
5465 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
5466 | if (!reply) | |
5467 | goto nomem; | |
5468 | ||
5469 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
5470 | * the T2-shutdown timer. | |
5471 | */ | |
5472 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5473 | ||
5474 | /* and start/restart a T2-shutdown timer of its own, */ | |
5475 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5476 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5477 | ||
9f70f46b | 5478 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5479 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5480 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5481 | ||
5482 | /* Enter the SHUTDOWN-ACK-SENT state. */ | |
5483 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5484 | SCTP_STATE(SCTP_STATE_SHUTDOWN_ACK_SENT)); | |
5485 | ||
5486 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5487 | * | |
5488 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5489 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5490 | */ |
5491 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5492 | ||
5493 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5494 | ||
5495 | return SCTP_DISPOSITION_CONSUME; | |
5496 | ||
5497 | nomem: | |
5498 | return SCTP_DISPOSITION_NOMEM; | |
5499 | } | |
5500 | ||
5501 | /* | |
5502 | * Ignore the event defined as other | |
5503 | * | |
5504 | * The return value is the disposition of the event. | |
5505 | */ | |
172a1599 XL |
5506 | enum sctp_disposition sctp_sf_ignore_other(struct net *net, |
5507 | const struct sctp_endpoint *ep, | |
5508 | const struct sctp_association *asoc, | |
5509 | const union sctp_subtype type, | |
5510 | void *arg, | |
5511 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5512 | { |
bb33381d DB |
5513 | pr_debug("%s: the event other type:%d is ignored\n", |
5514 | __func__, type.other); | |
5515 | ||
1da177e4 LT |
5516 | return SCTP_DISPOSITION_DISCARD; |
5517 | } | |
5518 | ||
5519 | /************************************************************ | |
5520 | * These are the state functions for handling timeout events. | |
5521 | ************************************************************/ | |
5522 | ||
5523 | /* | |
5524 | * RTX Timeout | |
5525 | * | |
5526 | * Section: 6.3.3 Handle T3-rtx Expiration | |
5527 | * | |
5528 | * Whenever the retransmission timer T3-rtx expires for a destination | |
5529 | * address, do the following: | |
5530 | * [See below] | |
5531 | * | |
5532 | * The return value is the disposition of the chunk. | |
5533 | */ | |
172a1599 XL |
5534 | enum sctp_disposition sctp_sf_do_6_3_3_rtx(struct net *net, |
5535 | const struct sctp_endpoint *ep, | |
5536 | const struct sctp_association *asoc, | |
5537 | const union sctp_subtype type, | |
5538 | void *arg, | |
5539 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5540 | { |
5541 | struct sctp_transport *transport = arg; | |
5542 | ||
b01a2407 | 5543 | SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS); |
ac0b0462 | 5544 | |
1da177e4 | 5545 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8a0d19c5 | 5546 | if (asoc->peer.zero_window_announced && |
5547 | asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { | |
f8d96052 TG |
5548 | /* |
5549 | * We are here likely because the receiver had its rwnd | |
5550 | * closed for a while and we have not been able to | |
5551 | * transmit the locally queued data within the maximum | |
5552 | * retransmission attempts limit. Start the T5 | |
5553 | * shutdown guard timer to give the receiver one last | |
5554 | * chance and some additional time to recover before | |
5555 | * aborting. | |
5556 | */ | |
5557 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START_ONCE, | |
5558 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5559 | } else { | |
5560 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
5561 | SCTP_ERROR(ETIMEDOUT)); | |
5562 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
5563 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5564 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
b01a2407 EB |
5565 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5566 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
f8d96052 TG |
5567 | return SCTP_DISPOSITION_DELETE_TCB; |
5568 | } | |
1da177e4 LT |
5569 | } |
5570 | ||
5571 | /* E1) For the destination address for which the timer | |
5572 | * expires, adjust its ssthresh with rules defined in Section | |
5573 | * 7.2.3 and set the cwnd <- MTU. | |
5574 | */ | |
5575 | ||
5576 | /* E2) For the destination address for which the timer | |
5577 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
5578 | * maximum value discussed in rule C7 above (RTO.max) may be | |
5579 | * used to provide an upper bound to this doubling operation. | |
5580 | */ | |
5581 | ||
5582 | /* E3) Determine how many of the earliest (i.e., lowest TSN) | |
5583 | * outstanding DATA chunks for the address for which the | |
5584 | * T3-rtx has expired will fit into a single packet, subject | |
5585 | * to the MTU constraint for the path corresponding to the | |
5586 | * destination transport address to which the retransmission | |
5587 | * is being sent (this may be different from the address for | |
5588 | * which the timer expires [see Section 6.4]). Call this | |
5589 | * value K. Bundle and retransmit those K DATA chunks in a | |
5590 | * single packet to the destination endpoint. | |
5591 | * | |
5592 | * Note: Any DATA chunks that were sent to the address for | |
5593 | * which the T3-rtx timer expired but did not fit in one MTU | |
5594 | * (rule E3 above), should be marked for retransmission and | |
5595 | * sent as soon as cwnd allows (normally when a SACK arrives). | |
5596 | */ | |
5597 | ||
1da177e4 LT |
5598 | /* Do some failure management (Section 8.2). */ |
5599 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
5600 | ||
1845a579 VY |
5601 | /* NB: Rules E4 and F1 are implicit in R1. */ |
5602 | sctp_add_cmd_sf(commands, SCTP_CMD_RETRAN, SCTP_TRANSPORT(transport)); | |
5603 | ||
1da177e4 LT |
5604 | return SCTP_DISPOSITION_CONSUME; |
5605 | } | |
5606 | ||
5607 | /* | |
5608 | * Generate delayed SACK on timeout | |
5609 | * | |
5610 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
5611 | * | |
5612 | * The guidelines on delayed acknowledgement algorithm specified in | |
5613 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
5614 | * acknowledgement SHOULD be generated for at least every second packet | |
5615 | * (not every second DATA chunk) received, and SHOULD be generated | |
5616 | * within 200 ms of the arrival of any unacknowledged DATA chunk. In | |
5617 | * some situations it may be beneficial for an SCTP transmitter to be | |
5618 | * more conservative than the algorithms detailed in this document | |
5619 | * allow. However, an SCTP transmitter MUST NOT be more aggressive than | |
5620 | * the following algorithms allow. | |
5621 | */ | |
172a1599 XL |
5622 | enum sctp_disposition sctp_sf_do_6_2_sack(struct net *net, |
5623 | const struct sctp_endpoint *ep, | |
5624 | const struct sctp_association *asoc, | |
5625 | const union sctp_subtype type, | |
5626 | void *arg, | |
5627 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5628 | { |
b01a2407 | 5629 | SCTP_INC_STATS(net, SCTP_MIB_DELAY_SACK_EXPIREDS); |
1da177e4 LT |
5630 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); |
5631 | return SCTP_DISPOSITION_CONSUME; | |
5632 | } | |
5633 | ||
5634 | /* | |
3f7a87d2 | 5635 | * sctp_sf_t1_init_timer_expire |
1da177e4 LT |
5636 | * |
5637 | * Section: 4 Note: 2 | |
5638 | * Verification Tag: | |
5639 | * Inputs | |
5640 | * (endpoint, asoc) | |
5641 | * | |
5642 | * RFC 2960 Section 4 Notes | |
5643 | * 2) If the T1-init timer expires, the endpoint MUST retransmit INIT | |
5644 | * and re-start the T1-init timer without changing state. This MUST | |
5645 | * be repeated up to 'Max.Init.Retransmits' times. After that, the | |
5646 | * endpoint MUST abort the initialization process and report the | |
5647 | * error to SCTP user. | |
5648 | * | |
3f7a87d2 FF |
5649 | * Outputs |
5650 | * (timers, events) | |
5651 | * | |
5652 | */ | |
172a1599 XL |
5653 | enum sctp_disposition sctp_sf_t1_init_timer_expire( |
5654 | struct net *net, | |
5655 | const struct sctp_endpoint *ep, | |
5656 | const struct sctp_association *asoc, | |
5657 | const union sctp_subtype type, | |
5658 | void *arg, | |
5659 | struct sctp_cmd_seq *commands) | |
3f7a87d2 | 5660 | { |
172a1599 | 5661 | int attempts = asoc->init_err_counter + 1; |
3f7a87d2 FF |
5662 | struct sctp_chunk *repl = NULL; |
5663 | struct sctp_bind_addr *bp; | |
3f7a87d2 | 5664 | |
bb33381d DB |
5665 | pr_debug("%s: timer T1 expired (INIT)\n", __func__); |
5666 | ||
b01a2407 | 5667 | SCTP_INC_STATS(net, SCTP_MIB_T1_INIT_EXPIREDS); |
3f7a87d2 | 5668 | |
81845c21 | 5669 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 FF |
5670 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; |
5671 | repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0); | |
5672 | if (!repl) | |
5673 | return SCTP_DISPOSITION_NOMEM; | |
5674 | ||
5675 | /* Choose transport for INIT. */ | |
5676 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
5677 | SCTP_CHUNK(repl)); | |
5678 | ||
5679 | /* Issue a sideeffect to do the needed accounting. */ | |
5680 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART, | |
5681 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5682 | ||
5683 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
5684 | } else { | |
bb33381d DB |
5685 | pr_debug("%s: giving up on INIT, attempts:%d " |
5686 | "max_init_attempts:%d\n", __func__, attempts, | |
5687 | asoc->max_init_attempts); | |
5688 | ||
8de8c873 SS |
5689 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5690 | SCTP_ERROR(ETIMEDOUT)); | |
3f7a87d2 | 5691 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5692 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
3f7a87d2 FF |
5693 | return SCTP_DISPOSITION_DELETE_TCB; |
5694 | } | |
5695 | ||
5696 | return SCTP_DISPOSITION_CONSUME; | |
5697 | } | |
5698 | ||
5699 | /* | |
5700 | * sctp_sf_t1_cookie_timer_expire | |
5701 | * | |
5702 | * Section: 4 Note: 2 | |
5703 | * Verification Tag: | |
5704 | * Inputs | |
5705 | * (endpoint, asoc) | |
5706 | * | |
5707 | * RFC 2960 Section 4 Notes | |
5708 | * 3) If the T1-cookie timer expires, the endpoint MUST retransmit | |
1da177e4 LT |
5709 | * COOKIE ECHO and re-start the T1-cookie timer without changing |
5710 | * state. This MUST be repeated up to 'Max.Init.Retransmits' times. | |
5711 | * After that, the endpoint MUST abort the initialization process and | |
5712 | * report the error to SCTP user. | |
5713 | * | |
5714 | * Outputs | |
5715 | * (timers, events) | |
5716 | * | |
5717 | */ | |
172a1599 XL |
5718 | enum sctp_disposition sctp_sf_t1_cookie_timer_expire( |
5719 | struct net *net, | |
5720 | const struct sctp_endpoint *ep, | |
5721 | const struct sctp_association *asoc, | |
5722 | const union sctp_subtype type, | |
5723 | void *arg, | |
5724 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5725 | { |
3f7a87d2 | 5726 | int attempts = asoc->init_err_counter + 1; |
172a1599 | 5727 | struct sctp_chunk *repl = NULL; |
1da177e4 | 5728 | |
bb33381d DB |
5729 | pr_debug("%s: timer T1 expired (COOKIE-ECHO)\n", __func__); |
5730 | ||
b01a2407 | 5731 | SCTP_INC_STATS(net, SCTP_MIB_T1_COOKIE_EXPIREDS); |
1da177e4 | 5732 | |
81845c21 | 5733 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 | 5734 | repl = sctp_make_cookie_echo(asoc, NULL); |
1da177e4 | 5735 | if (!repl) |
3f7a87d2 | 5736 | return SCTP_DISPOSITION_NOMEM; |
1da177e4 | 5737 | |
96cd0d3d VY |
5738 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, |
5739 | SCTP_CHUNK(repl)); | |
1da177e4 | 5740 | /* Issue a sideeffect to do the needed accounting. */ |
3f7a87d2 FF |
5741 | sctp_add_cmd_sf(commands, SCTP_CMD_COOKIEECHO_RESTART, |
5742 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
5743 | ||
1da177e4 LT |
5744 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
5745 | } else { | |
8de8c873 SS |
5746 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5747 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5748 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5749 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 LT |
5750 | return SCTP_DISPOSITION_DELETE_TCB; |
5751 | } | |
5752 | ||
5753 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5754 | } |
5755 | ||
5756 | /* RFC2960 9.2 If the timer expires, the endpoint must re-send the SHUTDOWN | |
5757 | * with the updated last sequential TSN received from its peer. | |
5758 | * | |
5759 | * An endpoint should limit the number of retransmissions of the | |
5760 | * SHUTDOWN chunk to the protocol parameter 'Association.Max.Retrans'. | |
5761 | * If this threshold is exceeded the endpoint should destroy the TCB and | |
5762 | * MUST report the peer endpoint unreachable to the upper layer (and | |
5763 | * thus the association enters the CLOSED state). The reception of any | |
5764 | * packet from its peer (i.e. as the peer sends all of its queued DATA | |
5765 | * chunks) should clear the endpoint's retransmission count and restart | |
5766 | * the T2-Shutdown timer, giving its peer ample opportunity to transmit | |
5767 | * all of its queued DATA chunks that have not yet been sent. | |
5768 | */ | |
172a1599 XL |
5769 | enum sctp_disposition sctp_sf_t2_timer_expire( |
5770 | struct net *net, | |
5771 | const struct sctp_endpoint *ep, | |
5772 | const struct sctp_association *asoc, | |
5773 | const union sctp_subtype type, | |
5774 | void *arg, | |
5775 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5776 | { |
5777 | struct sctp_chunk *reply = NULL; | |
5778 | ||
bb33381d DB |
5779 | pr_debug("%s: timer T2 expired\n", __func__); |
5780 | ||
b01a2407 | 5781 | SCTP_INC_STATS(net, SCTP_MIB_T2_SHUTDOWN_EXPIREDS); |
ac0b0462 | 5782 | |
58fbbed4 NH |
5783 | ((struct sctp_association *)asoc)->shutdown_retries++; |
5784 | ||
1da177e4 | 5785 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
5786 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5787 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
5788 | /* Note: CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
5789 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 5790 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
5791 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5792 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
5793 | return SCTP_DISPOSITION_DELETE_TCB; |
5794 | } | |
5795 | ||
5796 | switch (asoc->state) { | |
5797 | case SCTP_STATE_SHUTDOWN_SENT: | |
5798 | reply = sctp_make_shutdown(asoc, NULL); | |
5799 | break; | |
5800 | ||
5801 | case SCTP_STATE_SHUTDOWN_ACK_SENT: | |
5802 | reply = sctp_make_shutdown_ack(asoc, NULL); | |
5803 | break; | |
5804 | ||
5805 | default: | |
5806 | BUG(); | |
5807 | break; | |
3ff50b79 | 5808 | } |
1da177e4 LT |
5809 | |
5810 | if (!reply) | |
5811 | goto nomem; | |
5812 | ||
6345b199 WY |
5813 | /* Do some failure management (Section 8.2). |
5814 | * If we remove the transport an SHUTDOWN was last sent to, don't | |
5815 | * do failure management. | |
5816 | */ | |
5817 | if (asoc->shutdown_last_sent_to) | |
5818 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
5819 | SCTP_TRANSPORT(asoc->shutdown_last_sent_to)); | |
1da177e4 LT |
5820 | |
5821 | /* Set the transport for the SHUTDOWN/ACK chunk and the timeout for | |
5822 | * the T2-shutdown timer. | |
5823 | */ | |
5824 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5825 | ||
5826 | /* Restart the T2-shutdown timer. */ | |
5827 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5828 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5829 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5830 | return SCTP_DISPOSITION_CONSUME; | |
5831 | ||
5832 | nomem: | |
5833 | return SCTP_DISPOSITION_NOMEM; | |
5834 | } | |
5835 | ||
5836 | /* | |
5837 | * ADDIP Section 4.1 ASCONF CHunk Procedures | |
5838 | * If the T4 RTO timer expires the endpoint should do B1 to B5 | |
5839 | */ | |
172a1599 XL |
5840 | enum sctp_disposition sctp_sf_t4_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 *chunk = asoc->addip_last_asconf; | |
5849 | struct sctp_transport *transport = chunk->transport; | |
5850 | ||
b01a2407 | 5851 | SCTP_INC_STATS(net, SCTP_MIB_T4_RTO_EXPIREDS); |
ac0b0462 | 5852 | |
1da177e4 LT |
5853 | /* ADDIP 4.1 B1) Increment the error counters and perform path failure |
5854 | * detection on the appropriate destination address as defined in | |
5855 | * RFC2960 [5] section 8.1 and 8.2. | |
5856 | */ | |
10a43cea WY |
5857 | if (transport) |
5858 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
5859 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
5860 | |
5861 | /* Reconfig T4 timer and transport. */ | |
5862 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5863 | ||
5864 | /* ADDIP 4.1 B2) Increment the association error counters and perform | |
5865 | * endpoint failure detection on the association as defined in | |
5866 | * RFC2960 [5] section 8.1 and 8.2. | |
5867 | * association error counter is incremented in SCTP_CMD_STRIKE. | |
5868 | */ | |
5869 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
5870 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5871 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
8de8c873 SS |
5872 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5873 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5874 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 5875 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
5876 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5877 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
5878 | return SCTP_DISPOSITION_ABORT; |
5879 | } | |
5880 | ||
5881 | /* ADDIP 4.1 B3) Back-off the destination address RTO value to which | |
5882 | * the ASCONF chunk was sent by doubling the RTO timer value. | |
5883 | * This is done in SCTP_CMD_STRIKE. | |
5884 | */ | |
5885 | ||
5886 | /* ADDIP 4.1 B4) Re-transmit the ASCONF Chunk last sent and if possible | |
5887 | * choose an alternate destination address (please refer to RFC2960 | |
5888 | * [5] section 6.4.1). An endpoint MUST NOT add new parameters to this | |
d808ad9a | 5889 | * chunk, it MUST be the same (including its serial number) as the last |
1da177e4 LT |
5890 | * ASCONF sent. |
5891 | */ | |
5892 | sctp_chunk_hold(asoc->addip_last_asconf); | |
5893 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
5894 | SCTP_CHUNK(asoc->addip_last_asconf)); | |
5895 | ||
5896 | /* ADDIP 4.1 B5) Restart the T-4 RTO timer. Note that if a different | |
5897 | * destination is selected, then the RTO used will be that of the new | |
5898 | * destination address. | |
5899 | */ | |
5900 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5901 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5902 | ||
5903 | return SCTP_DISPOSITION_CONSUME; | |
5904 | } | |
5905 | ||
5906 | /* sctpimpguide-05 Section 2.12.2 | |
5907 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5908 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5909 | * At the expiration of this timer the sender SHOULD abort the association | |
5910 | * by sending an ABORT chunk. | |
5911 | */ | |
172a1599 XL |
5912 | enum sctp_disposition sctp_sf_t5_timer_expire( |
5913 | struct net *net, | |
5914 | const struct sctp_endpoint *ep, | |
5915 | const struct sctp_association *asoc, | |
5916 | const union sctp_subtype type, | |
5917 | void *arg, | |
5918 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5919 | { |
5920 | struct sctp_chunk *reply = NULL; | |
5921 | ||
bb33381d DB |
5922 | pr_debug("%s: timer T5 expired\n", __func__); |
5923 | ||
b01a2407 | 5924 | SCTP_INC_STATS(net, SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS); |
1da177e4 LT |
5925 | |
5926 | reply = sctp_make_abort(asoc, NULL, 0); | |
5927 | if (!reply) | |
5928 | goto nomem; | |
5929 | ||
5930 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
8de8c873 SS |
5931 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5932 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5933 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 5934 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 | 5935 | |
b01a2407 EB |
5936 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5937 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
a1080a8b | 5938 | |
1da177e4 LT |
5939 | return SCTP_DISPOSITION_DELETE_TCB; |
5940 | nomem: | |
5941 | return SCTP_DISPOSITION_NOMEM; | |
5942 | } | |
5943 | ||
5944 | /* Handle expiration of AUTOCLOSE timer. When the autoclose timer expires, | |
5945 | * the association is automatically closed by starting the shutdown process. | |
5946 | * The work that needs to be done is same as when SHUTDOWN is initiated by | |
5947 | * the user. So this routine looks same as sctp_sf_do_9_2_prm_shutdown(). | |
5948 | */ | |
172a1599 XL |
5949 | enum sctp_disposition sctp_sf_autoclose_timer_expire( |
5950 | struct net *net, | |
5951 | const struct sctp_endpoint *ep, | |
5952 | const struct sctp_association *asoc, | |
5953 | const union sctp_subtype type, | |
5954 | void *arg, | |
5955 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5956 | { |
172a1599 | 5957 | enum sctp_disposition disposition; |
1da177e4 | 5958 | |
b01a2407 | 5959 | SCTP_INC_STATS(net, SCTP_MIB_AUTOCLOSE_EXPIREDS); |
ac0b0462 | 5960 | |
1da177e4 LT |
5961 | /* From 9.2 Shutdown of an Association |
5962 | * Upon receipt of the SHUTDOWN primitive from its upper | |
5963 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
5964 | * remains there until all outstanding data has been | |
5965 | * acknowledged by its peer. The endpoint accepts no new data | |
5966 | * from its upper layer, but retransmits data to the far end | |
5967 | * if necessary to fill gaps. | |
5968 | */ | |
5969 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5970 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
5971 | ||
1da177e4 LT |
5972 | disposition = SCTP_DISPOSITION_CONSUME; |
5973 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 5974 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
5975 | arg, commands); |
5976 | } | |
172a1599 | 5977 | |
1da177e4 LT |
5978 | return disposition; |
5979 | } | |
5980 | ||
5981 | /***************************************************************************** | |
5982 | * These are sa state functions which could apply to all types of events. | |
5983 | ****************************************************************************/ | |
5984 | ||
5985 | /* | |
5986 | * This table entry is not implemented. | |
5987 | * | |
5988 | * Inputs | |
5989 | * (endpoint, asoc, chunk) | |
5990 | * | |
5991 | * The return value is the disposition of the chunk. | |
5992 | */ | |
172a1599 XL |
5993 | enum sctp_disposition sctp_sf_not_impl(struct net *net, |
5994 | const struct sctp_endpoint *ep, | |
5995 | const struct sctp_association *asoc, | |
5996 | const union sctp_subtype type, | |
5997 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5998 | { |
5999 | return SCTP_DISPOSITION_NOT_IMPL; | |
6000 | } | |
6001 | ||
6002 | /* | |
6003 | * This table entry represents a bug. | |
6004 | * | |
6005 | * Inputs | |
6006 | * (endpoint, asoc, chunk) | |
6007 | * | |
6008 | * The return value is the disposition of the chunk. | |
6009 | */ | |
172a1599 XL |
6010 | enum sctp_disposition sctp_sf_bug(struct net *net, |
6011 | const struct sctp_endpoint *ep, | |
6012 | const struct sctp_association *asoc, | |
6013 | const union sctp_subtype type, | |
6014 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6015 | { |
6016 | return SCTP_DISPOSITION_BUG; | |
6017 | } | |
6018 | ||
6019 | /* | |
6020 | * This table entry represents the firing of a timer in the wrong state. | |
6021 | * Since timer deletion cannot be guaranteed a timer 'may' end up firing | |
6022 | * when the association is in the wrong state. This event should | |
6023 | * be ignored, so as to prevent any rearming of the timer. | |
6024 | * | |
6025 | * Inputs | |
6026 | * (endpoint, asoc, chunk) | |
6027 | * | |
6028 | * The return value is the disposition of the chunk. | |
6029 | */ | |
172a1599 XL |
6030 | enum sctp_disposition sctp_sf_timer_ignore(struct net *net, |
6031 | const struct sctp_endpoint *ep, | |
6032 | const struct sctp_association *asoc, | |
6033 | const union sctp_subtype type, | |
6034 | void *arg, | |
6035 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6036 | { |
bb33381d DB |
6037 | pr_debug("%s: timer %d ignored\n", __func__, type.chunk); |
6038 | ||
1da177e4 LT |
6039 | return SCTP_DISPOSITION_CONSUME; |
6040 | } | |
6041 | ||
6042 | /******************************************************************** | |
6043 | * 2nd Level Abstractions | |
6044 | ********************************************************************/ | |
6045 | ||
6046 | /* Pull the SACK chunk based on the SACK header. */ | |
6047 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk) | |
6048 | { | |
6049 | struct sctp_sackhdr *sack; | |
172a1599 | 6050 | __u16 num_dup_tsns; |
1da177e4 LT |
6051 | unsigned int len; |
6052 | __u16 num_blocks; | |
1da177e4 LT |
6053 | |
6054 | /* Protect ourselves from reading too far into | |
6055 | * the skb from a bogus sender. | |
6056 | */ | |
6057 | sack = (struct sctp_sackhdr *) chunk->skb->data; | |
6058 | ||
6059 | num_blocks = ntohs(sack->num_gap_ack_blocks); | |
6060 | num_dup_tsns = ntohs(sack->num_dup_tsns); | |
6061 | len = sizeof(struct sctp_sackhdr); | |
6062 | len += (num_blocks + num_dup_tsns) * sizeof(__u32); | |
6063 | if (len > chunk->skb->len) | |
6064 | return NULL; | |
6065 | ||
6066 | skb_pull(chunk->skb, len); | |
6067 | ||
6068 | return sack; | |
6069 | } | |
6070 | ||
6071 | /* Create an ABORT packet to be sent as a response, with the specified | |
6072 | * error causes. | |
6073 | */ | |
172a1599 XL |
6074 | static struct sctp_packet *sctp_abort_pkt_new( |
6075 | struct net *net, | |
6076 | const struct sctp_endpoint *ep, | |
6077 | const struct sctp_association *asoc, | |
6078 | struct sctp_chunk *chunk, | |
6079 | const void *payload, size_t paylen) | |
1da177e4 LT |
6080 | { |
6081 | struct sctp_packet *packet; | |
6082 | struct sctp_chunk *abort; | |
6083 | ||
2ce95503 | 6084 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6085 | |
6086 | if (packet) { | |
6087 | /* Make an ABORT. | |
6088 | * The T bit will be set if the asoc is NULL. | |
6089 | */ | |
6090 | abort = sctp_make_abort(asoc, chunk, paylen); | |
6091 | if (!abort) { | |
6092 | sctp_ootb_pkt_free(packet); | |
6093 | return NULL; | |
6094 | } | |
047a2428 JF |
6095 | |
6096 | /* Reflect vtag if T-Bit is set */ | |
6097 | if (sctp_test_T_bit(abort)) | |
6098 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
6099 | ||
1da177e4 LT |
6100 | /* Add specified error causes, i.e., payload, to the |
6101 | * end of the chunk. | |
6102 | */ | |
6103 | sctp_addto_chunk(abort, paylen, payload); | |
6104 | ||
6105 | /* Set the skb to the belonging sock for accounting. */ | |
6106 | abort->skb->sk = ep->base.sk; | |
6107 | ||
6108 | sctp_packet_append_chunk(packet, abort); | |
6109 | ||
6110 | } | |
6111 | ||
6112 | return packet; | |
6113 | } | |
6114 | ||
6115 | /* Allocate a packet for responding in the OOTB conditions. */ | |
172a1599 XL |
6116 | static struct sctp_packet *sctp_ootb_pkt_new( |
6117 | struct net *net, | |
6118 | const struct sctp_association *asoc, | |
6119 | const struct sctp_chunk *chunk) | |
1da177e4 | 6120 | { |
1da177e4 | 6121 | struct sctp_transport *transport; |
172a1599 XL |
6122 | struct sctp_packet *packet; |
6123 | __u16 sport, dport; | |
1da177e4 LT |
6124 | __u32 vtag; |
6125 | ||
6126 | /* Get the source and destination port from the inbound packet. */ | |
6127 | sport = ntohs(chunk->sctp_hdr->dest); | |
6128 | dport = ntohs(chunk->sctp_hdr->source); | |
6129 | ||
6130 | /* The V-tag is going to be the same as the inbound packet if no | |
6131 | * association exists, otherwise, use the peer's vtag. | |
6132 | */ | |
6133 | if (asoc) { | |
02c4e12c WY |
6134 | /* Special case the INIT-ACK as there is no peer's vtag |
6135 | * yet. | |
6136 | */ | |
cb3f837b | 6137 | switch (chunk->chunk_hdr->type) { |
02c4e12c WY |
6138 | case SCTP_CID_INIT_ACK: |
6139 | { | |
cb1844c4 | 6140 | struct sctp_initack_chunk *initack; |
02c4e12c | 6141 | |
cb1844c4 | 6142 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
02c4e12c WY |
6143 | vtag = ntohl(initack->init_hdr.init_tag); |
6144 | break; | |
6145 | } | |
6146 | default: | |
6147 | vtag = asoc->peer.i.init_tag; | |
6148 | break; | |
6149 | } | |
1da177e4 LT |
6150 | } else { |
6151 | /* Special case the INIT and stale COOKIE_ECHO as there is no | |
6152 | * vtag yet. | |
6153 | */ | |
cb3f837b | 6154 | switch (chunk->chunk_hdr->type) { |
1da177e4 LT |
6155 | case SCTP_CID_INIT: |
6156 | { | |
01a992be | 6157 | struct sctp_init_chunk *init; |
1da177e4 | 6158 | |
01a992be | 6159 | init = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
6160 | vtag = ntohl(init->init_hdr.init_tag); |
6161 | break; | |
6162 | } | |
d808ad9a | 6163 | default: |
1da177e4 LT |
6164 | vtag = ntohl(chunk->sctp_hdr->vtag); |
6165 | break; | |
6166 | } | |
6167 | } | |
6168 | ||
6169 | /* Make a transport for the bucket, Eliza... */ | |
89bf3450 | 6170 | transport = sctp_transport_new(net, sctp_source(chunk), GFP_ATOMIC); |
1da177e4 LT |
6171 | if (!transport) |
6172 | goto nomem; | |
6173 | ||
6174 | /* Cache a route for the transport with the chunk's destination as | |
6175 | * the source address. | |
6176 | */ | |
16b0a030 | 6177 | sctp_transport_route(transport, (union sctp_addr *)&chunk->dest, |
2ce95503 | 6178 | sctp_sk(net->sctp.ctl_sock)); |
1da177e4 | 6179 | |
66b91d2c MRL |
6180 | packet = &transport->packet; |
6181 | sctp_packet_init(packet, transport, sport, dport); | |
6182 | sctp_packet_config(packet, vtag, 0); | |
1da177e4 LT |
6183 | |
6184 | return packet; | |
6185 | ||
6186 | nomem: | |
6187 | return NULL; | |
6188 | } | |
6189 | ||
6190 | /* Free the packet allocated earlier for responding in the OOTB condition. */ | |
6191 | void sctp_ootb_pkt_free(struct sctp_packet *packet) | |
6192 | { | |
6193 | sctp_transport_free(packet->transport); | |
6194 | } | |
6195 | ||
6196 | /* Send a stale cookie error when a invalid COOKIE ECHO chunk is found */ | |
24cb81a6 EB |
6197 | static void sctp_send_stale_cookie_err(struct net *net, |
6198 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
6199 | const struct sctp_association *asoc, |
6200 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 6201 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
6202 | struct sctp_chunk *err_chunk) |
6203 | { | |
6204 | struct sctp_packet *packet; | |
6205 | ||
6206 | if (err_chunk) { | |
2ce95503 | 6207 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6208 | if (packet) { |
6209 | struct sctp_signed_cookie *cookie; | |
6210 | ||
6211 | /* Override the OOTB vtag from the cookie. */ | |
6212 | cookie = chunk->subh.cookie_hdr; | |
6213 | packet->vtag = cookie->c.peer_vtag; | |
d808ad9a | 6214 | |
1da177e4 LT |
6215 | /* Set the skb to the belonging sock for accounting. */ |
6216 | err_chunk->skb->sk = ep->base.sk; | |
6217 | sctp_packet_append_chunk(packet, err_chunk); | |
6218 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
6219 | SCTP_PACKET(packet)); | |
b01a2407 | 6220 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
6221 | } else |
6222 | sctp_chunk_free (err_chunk); | |
6223 | } | |
6224 | } | |
6225 | ||
6226 | ||
6227 | /* Process a data chunk */ | |
6228 | static int sctp_eat_data(const struct sctp_association *asoc, | |
6229 | struct sctp_chunk *chunk, | |
a85bbeb2 | 6230 | struct sctp_cmd_seq *commands) |
1da177e4 | 6231 | { |
7c3ceb4f | 6232 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
049b3ff5 | 6233 | struct sock *sk = asoc->base.sk; |
24cb81a6 | 6234 | struct net *net = sock_net(sk); |
172a1599 XL |
6235 | struct sctp_datahdr *data_hdr; |
6236 | struct sctp_chunk *err; | |
6237 | enum sctp_verb deliver; | |
6238 | size_t datalen; | |
172a1599 XL |
6239 | __u32 tsn; |
6240 | int tmp; | |
1da177e4 | 6241 | |
3583df1a XL |
6242 | data_hdr = (struct sctp_datahdr *)chunk->skb->data; |
6243 | chunk->subh.data_hdr = data_hdr; | |
9d4ceaf1 | 6244 | skb_pull(chunk->skb, sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
6245 | |
6246 | tsn = ntohl(data_hdr->tsn); | |
bb33381d | 6247 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
6248 | |
6249 | /* ASSERT: Now skb->data is really the user data. */ | |
6250 | ||
6251 | /* Process ECN based congestion. | |
6252 | * | |
6253 | * Since the chunk structure is reused for all chunks within | |
6254 | * a packet, we use ecn_ce_done to track if we've already | |
6255 | * done CE processing for this packet. | |
6256 | * | |
6257 | * We need to do ECN processing even if we plan to discard the | |
6258 | * chunk later. | |
6259 | */ | |
6260 | ||
2d47fd12 | 6261 | if (asoc->peer.ecn_capable && !chunk->ecn_ce_done) { |
e7487c86 | 6262 | struct sctp_af *af = SCTP_INPUT_CB(chunk->skb)->af; |
1da177e4 LT |
6263 | chunk->ecn_ce_done = 1; |
6264 | ||
2d47fd12 | 6265 | if (af->is_ce(sctp_gso_headskb(chunk->skb))) { |
1da177e4 LT |
6266 | /* Do real work as sideffect. */ |
6267 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_CE, | |
6268 | SCTP_U32(tsn)); | |
6269 | } | |
6270 | } | |
6271 | ||
6272 | tmp = sctp_tsnmap_check(&asoc->peer.tsn_map, tsn); | |
6273 | if (tmp < 0) { | |
6274 | /* The TSN is too high--silently discard the chunk and | |
6275 | * count on it getting retransmitted later. | |
6276 | */ | |
196d6759 MB |
6277 | if (chunk->asoc) |
6278 | chunk->asoc->stats.outofseqtsns++; | |
1da177e4 LT |
6279 | return SCTP_IERROR_HIGH_TSN; |
6280 | } else if (tmp > 0) { | |
6281 | /* This is a duplicate. Record it. */ | |
6282 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_DUP, SCTP_U32(tsn)); | |
6283 | return SCTP_IERROR_DUP_TSN; | |
6284 | } | |
6285 | ||
6286 | /* This is a new TSN. */ | |
6287 | ||
6288 | /* Discard if there is no room in the receive window. | |
6289 | * Actually, allow a little bit of overflow (up to a MTU). | |
6290 | */ | |
6291 | datalen = ntohs(chunk->chunk_hdr->length); | |
9d4ceaf1 | 6292 | datalen -= sctp_datachk_len(&asoc->stream); |
1da177e4 LT |
6293 | |
6294 | deliver = SCTP_CMD_CHUNK_ULP; | |
6295 | ||
6296 | /* Think about partial delivery. */ | |
6297 | if ((datalen >= asoc->rwnd) && (!asoc->ulpq.pd_mode)) { | |
6298 | ||
6299 | /* Even if we don't accept this chunk there is | |
6300 | * memory pressure. | |
6301 | */ | |
6302 | sctp_add_cmd_sf(commands, SCTP_CMD_PART_DELIVER, SCTP_NULL()); | |
6303 | } | |
6304 | ||
d808ad9a | 6305 | /* Spill over rwnd a little bit. Note: While allowed, this spill over |
1da177e4 LT |
6306 | * seems a bit troublesome in that frag_point varies based on |
6307 | * PMTU. In cases, such as loopback, this might be a rather | |
6308 | * large spill over. | |
4d93df0a | 6309 | */ |
362d5204 | 6310 | if ((!chunk->data_accepted) && (!asoc->rwnd || asoc->rwnd_over || |
4d93df0a | 6311 | (datalen > asoc->rwnd + asoc->frag_point))) { |
1da177e4 LT |
6312 | |
6313 | /* If this is the next TSN, consider reneging to make | |
6314 | * room. Note: Playing nice with a confused sender. A | |
6315 | * malicious sender can still eat up all our buffer | |
6316 | * space and in the future we may want to detect and | |
6317 | * do more drastic reneging. | |
6318 | */ | |
7c3ceb4f NH |
6319 | if (sctp_tsnmap_has_gap(map) && |
6320 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { | |
bb33381d | 6321 | pr_debug("%s: reneging for tsn:%u\n", __func__, tsn); |
1da177e4 LT |
6322 | deliver = SCTP_CMD_RENEGE; |
6323 | } else { | |
bb33381d DB |
6324 | pr_debug("%s: discard tsn:%u len:%zu, rwnd:%d\n", |
6325 | __func__, tsn, datalen, asoc->rwnd); | |
6326 | ||
1da177e4 LT |
6327 | return SCTP_IERROR_IGNORE_TSN; |
6328 | } | |
6329 | } | |
6330 | ||
4d93df0a NH |
6331 | /* |
6332 | * Also try to renege to limit our memory usage in the event that | |
6333 | * we are under memory pressure | |
3ab224be | 6334 | * If we can't renege, don't worry about it, the sk_rmem_schedule |
4d93df0a NH |
6335 | * in sctp_ulpevent_make_rcvmsg will drop the frame if we grow our |
6336 | * memory usage too much | |
6337 | */ | |
6338 | if (*sk->sk_prot_creator->memory_pressure) { | |
6339 | if (sctp_tsnmap_has_gap(map) && | |
f7010e61 | 6340 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { |
bb33381d DB |
6341 | pr_debug("%s: under pressure, reneging for tsn:%u\n", |
6342 | __func__, tsn); | |
4d93df0a NH |
6343 | deliver = SCTP_CMD_RENEGE; |
6344 | } | |
6345 | } | |
6346 | ||
1da177e4 LT |
6347 | /* |
6348 | * Section 3.3.10.9 No User Data (9) | |
6349 | * | |
6350 | * Cause of error | |
6351 | * --------------- | |
6352 | * No User Data: This error cause is returned to the originator of a | |
6353 | * DATA chunk if a received DATA chunk has no user data. | |
6354 | */ | |
6355 | if (unlikely(0 == datalen)) { | |
6356 | err = sctp_make_abort_no_data(asoc, chunk, tsn); | |
6357 | if (err) { | |
6358 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6359 | SCTP_CHUNK(err)); | |
6360 | } | |
6361 | /* We are going to ABORT, so we might as well stop | |
6362 | * processing the rest of the chunks in the packet. | |
6363 | */ | |
cb3f837b | 6364 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 SS |
6365 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6366 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 | 6367 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6368 | SCTP_PERR(SCTP_ERROR_NO_DATA)); |
b01a2407 EB |
6369 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6370 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
6371 | return SCTP_IERROR_NO_DATA; |
6372 | } | |
6373 | ||
9faa730f SS |
6374 | chunk->data_accepted = 1; |
6375 | ||
1da177e4 LT |
6376 | /* Note: Some chunks may get overcounted (if we drop) or overcounted |
6377 | * if we renege and the chunk arrives again. | |
6378 | */ | |
196d6759 | 6379 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
b01a2407 | 6380 | SCTP_INC_STATS(net, SCTP_MIB_INUNORDERCHUNKS); |
196d6759 MB |
6381 | if (chunk->asoc) |
6382 | chunk->asoc->stats.iuodchunks++; | |
6383 | } else { | |
b01a2407 | 6384 | SCTP_INC_STATS(net, SCTP_MIB_INORDERCHUNKS); |
196d6759 MB |
6385 | if (chunk->asoc) |
6386 | chunk->asoc->stats.iodchunks++; | |
f1751c57 | 6387 | } |
1da177e4 LT |
6388 | |
6389 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
6390 | * | |
6391 | * If an endpoint receive a DATA chunk with an invalid stream | |
6392 | * identifier, it shall acknowledge the reception of the DATA chunk | |
6393 | * following the normal procedure, immediately send an ERROR chunk | |
6394 | * with cause set to "Invalid Stream Identifier" (See Section 3.3.10) | |
6395 | * and discard the DATA chunk. | |
6396 | */ | |
9d4ceaf1 | 6397 | if (ntohs(data_hdr->stream) >= asoc->stream.incnt) { |
3888e9ef VY |
6398 | /* Mark tsn as received even though we drop it */ |
6399 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_TSN, SCTP_U32(tsn)); | |
6400 | ||
1da177e4 LT |
6401 | err = sctp_make_op_error(asoc, chunk, SCTP_ERROR_INV_STRM, |
6402 | &data_hdr->stream, | |
6383cfb3 VY |
6403 | sizeof(data_hdr->stream), |
6404 | sizeof(u16)); | |
1da177e4 LT |
6405 | if (err) |
6406 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6407 | SCTP_CHUNK(err)); | |
6408 | return SCTP_IERROR_BAD_STREAM; | |
6409 | } | |
6410 | ||
f1751c57 VY |
6411 | /* Check to see if the SSN is possible for this TSN. |
6412 | * The biggest gap we can record is 4K wide. Since SSNs wrap | |
6413 | * at an unsigned short, there is no way that an SSN can | |
6414 | * wrap and for a valid TSN. We can simply check if the current | |
6415 | * SSN is smaller then the next expected one. If it is, it wrapped | |
6416 | * and is invalid. | |
6417 | */ | |
9d4ceaf1 | 6418 | if (!asoc->stream.si->validate_data(chunk)) |
f1751c57 | 6419 | return SCTP_IERROR_PROTO_VIOLATION; |
f1751c57 | 6420 | |
1da177e4 LT |
6421 | /* Send the data up to the user. Note: Schedule the |
6422 | * SCTP_CMD_CHUNK_ULP cmd before the SCTP_CMD_GEN_SACK, as the SACK | |
6423 | * chunk needs the updated rwnd. | |
6424 | */ | |
6425 | sctp_add_cmd_sf(commands, deliver, SCTP_CHUNK(chunk)); | |
6426 | ||
6427 | return SCTP_IERROR_NO_ERROR; | |
6428 | } |