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1da177e4 LT |
1 | /* SCTP kernel reference Implementation |
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 | * | |
7 | * This file is part of the SCTP kernel reference Implementation | |
8 | * | |
9 | * These functions work with the state functions in sctp_sm_statefuns.c | |
10 | * to implement the state operations. These functions implement the | |
11 | * steps which require modifying existing data structures. | |
12 | * | |
13 | * The SCTP reference implementation is free software; | |
14 | * you can redistribute it and/or modify it under the terms of | |
15 | * the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | * The SCTP reference implementation is distributed in the hope that it | |
20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
21 | * ************************ | |
22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
23 | * See the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with GNU CC; see the file COPYING. If not, write to | |
27 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
28 | * Boston, MA 02111-1307, USA. | |
29 | * | |
30 | * Please send any bug reports or fixes you make to the | |
31 | * email address(es): | |
32 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
33 | * | |
34 | * Or submit a bug report through the following website: | |
35 | * http://www.sf.net/projects/lksctp | |
36 | * | |
37 | * Written or modified by: | |
38 | * La Monte H.P. Yarroll <piggy@acm.org> | |
39 | * Karl Knutson <karl@athena.chicago.il.us> | |
40 | * C. Robin <chris@hundredacre.ac.uk> | |
41 | * Jon Grimm <jgrimm@us.ibm.com> | |
42 | * Xingang Guo <xingang.guo@intel.com> | |
43 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
44 | * Sridhar Samudrala <sri@us.ibm.com> | |
45 | * Daisy Chang <daisyc@us.ibm.com> | |
46 | * Ardelle Fan <ardelle.fan@intel.com> | |
47 | * Kevin Gao <kevin.gao@intel.com> | |
48 | * | |
49 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
50 | * be incorporated into the next SCTP release. | |
51 | */ | |
52 | ||
53 | #include <linux/types.h> | |
54 | #include <linux/kernel.h> | |
55 | #include <linux/ip.h> | |
56 | #include <linux/ipv6.h> | |
57 | #include <linux/net.h> | |
58 | #include <linux/inet.h> | |
59 | #include <asm/scatterlist.h> | |
60 | #include <linux/crypto.h> | |
61 | #include <net/sock.h> | |
62 | ||
63 | #include <linux/skbuff.h> | |
64 | #include <linux/random.h> /* for get_random_bytes */ | |
65 | #include <net/sctp/sctp.h> | |
66 | #include <net/sctp/sm.h> | |
67 | ||
68 | extern kmem_cache_t *sctp_chunk_cachep; | |
69 | ||
70 | SCTP_STATIC | |
71 | struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, | |
72 | __u8 type, __u8 flags, int paylen); | |
73 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, | |
74 | const struct sctp_association *asoc, | |
75 | const struct sctp_chunk *init_chunk, | |
76 | int *cookie_len, | |
77 | const __u8 *raw_addrs, int addrs_len); | |
78 | static int sctp_process_param(struct sctp_association *asoc, | |
79 | union sctp_params param, | |
80 | const union sctp_addr *peer_addr, | |
dd0fc66f | 81 | gfp_t gfp); |
1da177e4 LT |
82 | |
83 | /* What was the inbound interface for this chunk? */ | |
84 | int sctp_chunk_iif(const struct sctp_chunk *chunk) | |
85 | { | |
86 | struct sctp_af *af; | |
87 | int iif = 0; | |
88 | ||
89 | af = sctp_get_af_specific(ipver2af(chunk->skb->nh.iph->version)); | |
90 | if (af) | |
91 | iif = af->skb_iif(chunk->skb); | |
92 | ||
93 | return iif; | |
94 | } | |
95 | ||
96 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
97 | * | |
98 | * Note 2: The ECN capable field is reserved for future use of | |
99 | * Explicit Congestion Notification. | |
100 | */ | |
101 | static const struct sctp_paramhdr ecap_param = { | |
102 | SCTP_PARAM_ECN_CAPABLE, | |
103 | __constant_htons(sizeof(struct sctp_paramhdr)), | |
104 | }; | |
105 | static const struct sctp_paramhdr prsctp_param = { | |
106 | SCTP_PARAM_FWD_TSN_SUPPORT, | |
107 | __constant_htons(sizeof(struct sctp_paramhdr)), | |
108 | }; | |
109 | ||
110 | /* A helper to initialize to initialize an op error inside a | |
111 | * provided chunk, as most cause codes will be embedded inside an | |
112 | * abort chunk. | |
113 | */ | |
5bf2db03 | 114 | void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, |
1da177e4 LT |
115 | const void *payload, size_t paylen) |
116 | { | |
117 | sctp_errhdr_t err; | |
118 | int padlen; | |
119 | __u16 len; | |
120 | ||
121 | /* Cause code constants are now defined in network order. */ | |
122 | err.cause = cause_code; | |
123 | len = sizeof(sctp_errhdr_t) + paylen; | |
124 | padlen = len % 4; | |
125 | err.length = htons(len); | |
126 | len += padlen; | |
127 | sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); | |
128 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, paylen, payload); | |
129 | } | |
130 | ||
131 | /* 3.3.2 Initiation (INIT) (1) | |
132 | * | |
133 | * This chunk is used to initiate a SCTP association between two | |
134 | * endpoints. The format of the INIT chunk is shown below: | |
135 | * | |
136 | * 0 1 2 3 | |
137 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
138 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
139 | * | Type = 1 | Chunk Flags | Chunk Length | | |
140 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
141 | * | Initiate Tag | | |
142 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
143 | * | Advertised Receiver Window Credit (a_rwnd) | | |
144 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
145 | * | Number of Outbound Streams | Number of Inbound Streams | | |
146 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
147 | * | Initial TSN | | |
148 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
149 | * \ \ | |
150 | * / Optional/Variable-Length Parameters / | |
151 | * \ \ | |
152 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
153 | * | |
154 | * | |
155 | * The INIT chunk contains the following parameters. Unless otherwise | |
156 | * noted, each parameter MUST only be included once in the INIT chunk. | |
157 | * | |
158 | * Fixed Parameters Status | |
159 | * ---------------------------------------------- | |
160 | * Initiate Tag Mandatory | |
161 | * Advertised Receiver Window Credit Mandatory | |
162 | * Number of Outbound Streams Mandatory | |
163 | * Number of Inbound Streams Mandatory | |
164 | * Initial TSN Mandatory | |
165 | * | |
166 | * Variable Parameters Status Type Value | |
167 | * ------------------------------------------------------------- | |
168 | * IPv4 Address (Note 1) Optional 5 | |
169 | * IPv6 Address (Note 1) Optional 6 | |
170 | * Cookie Preservative Optional 9 | |
171 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) | |
172 | * Host Name Address (Note 3) Optional 11 | |
173 | * Supported Address Types (Note 4) Optional 12 | |
174 | */ | |
175 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, | |
176 | const struct sctp_bind_addr *bp, | |
dd0fc66f | 177 | gfp_t gfp, int vparam_len) |
1da177e4 LT |
178 | { |
179 | sctp_inithdr_t init; | |
180 | union sctp_params addrs; | |
181 | size_t chunksize; | |
182 | struct sctp_chunk *retval = NULL; | |
183 | int num_types, addrs_len = 0; | |
184 | struct sctp_sock *sp; | |
185 | sctp_supported_addrs_param_t sat; | |
186 | __u16 types[2]; | |
187 | sctp_adaption_ind_param_t aiparam; | |
188 | ||
189 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
190 | * | |
191 | * Note 1: The INIT chunks can contain multiple addresses that | |
192 | * can be IPv4 and/or IPv6 in any combination. | |
193 | */ | |
194 | retval = NULL; | |
195 | ||
196 | /* Convert the provided bind address list to raw format. */ | |
197 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); | |
198 | ||
199 | init.init_tag = htonl(asoc->c.my_vtag); | |
200 | init.a_rwnd = htonl(asoc->rwnd); | |
201 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
202 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
203 | init.initial_tsn = htonl(asoc->c.initial_tsn); | |
204 | ||
205 | /* How many address types are needed? */ | |
206 | sp = sctp_sk(asoc->base.sk); | |
207 | num_types = sp->pf->supported_addrs(sp, types); | |
208 | ||
209 | chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types); | |
210 | chunksize += sizeof(ecap_param); | |
211 | if (sctp_prsctp_enable) | |
212 | chunksize += sizeof(prsctp_param); | |
213 | chunksize += sizeof(aiparam); | |
214 | chunksize += vparam_len; | |
215 | ||
216 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
217 | * | |
218 | * Note 3: An INIT chunk MUST NOT contain more than one Host | |
219 | * Name address parameter. Moreover, the sender of the INIT | |
220 | * MUST NOT combine any other address types with the Host Name | |
221 | * address in the INIT. The receiver of INIT MUST ignore any | |
222 | * other address types if the Host Name address parameter is | |
223 | * present in the received INIT chunk. | |
224 | * | |
225 | * PLEASE DO NOT FIXME [This version does not support Host Name.] | |
226 | */ | |
227 | ||
228 | retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); | |
229 | if (!retval) | |
230 | goto nodata; | |
231 | ||
232 | retval->subh.init_hdr = | |
233 | sctp_addto_chunk(retval, sizeof(init), &init); | |
234 | retval->param_hdr.v = | |
235 | sctp_addto_chunk(retval, addrs_len, addrs.v); | |
236 | ||
237 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
238 | * | |
239 | * Note 4: This parameter, when present, specifies all the | |
240 | * address types the sending endpoint can support. The absence | |
241 | * of this parameter indicates that the sending endpoint can | |
242 | * support any address type. | |
243 | */ | |
244 | sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; | |
245 | sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); | |
246 | sctp_addto_chunk(retval, sizeof(sat), &sat); | |
247 | sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); | |
248 | ||
249 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
250 | if (sctp_prsctp_enable) | |
251 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
252 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND; | |
253 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
254 | aiparam.adaption_ind = htonl(sp->adaption_ind); | |
255 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
256 | nodata: | |
a51482bd | 257 | kfree(addrs.v); |
1da177e4 LT |
258 | return retval; |
259 | } | |
260 | ||
261 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, | |
262 | const struct sctp_chunk *chunk, | |
dd0fc66f | 263 | gfp_t gfp, int unkparam_len) |
1da177e4 LT |
264 | { |
265 | sctp_inithdr_t initack; | |
266 | struct sctp_chunk *retval; | |
267 | union sctp_params addrs; | |
268 | int addrs_len; | |
269 | sctp_cookie_param_t *cookie; | |
270 | int cookie_len; | |
271 | size_t chunksize; | |
272 | sctp_adaption_ind_param_t aiparam; | |
273 | ||
274 | retval = NULL; | |
275 | ||
276 | /* Note: there may be no addresses to embed. */ | |
277 | addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); | |
278 | ||
279 | initack.init_tag = htonl(asoc->c.my_vtag); | |
280 | initack.a_rwnd = htonl(asoc->rwnd); | |
281 | initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
282 | initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
283 | initack.initial_tsn = htonl(asoc->c.initial_tsn); | |
284 | ||
285 | /* FIXME: We really ought to build the cookie right | |
286 | * into the packet instead of allocating more fresh memory. | |
287 | */ | |
288 | cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, | |
289 | addrs.v, addrs_len); | |
290 | if (!cookie) | |
291 | goto nomem_cookie; | |
292 | ||
293 | /* Calculate the total size of allocation, include the reserved | |
294 | * space for reporting unknown parameters if it is specified. | |
295 | */ | |
296 | chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; | |
297 | ||
298 | /* Tell peer that we'll do ECN only if peer advertised such cap. */ | |
299 | if (asoc->peer.ecn_capable) | |
300 | chunksize += sizeof(ecap_param); | |
301 | ||
302 | /* Tell peer that we'll do PR-SCTP only if peer advertised. */ | |
303 | if (asoc->peer.prsctp_capable) | |
304 | chunksize += sizeof(prsctp_param); | |
305 | ||
306 | chunksize += sizeof(aiparam); | |
307 | ||
308 | /* Now allocate and fill out the chunk. */ | |
309 | retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); | |
310 | if (!retval) | |
311 | goto nomem_chunk; | |
312 | ||
313 | /* Per the advice in RFC 2960 6.4, send this reply to | |
314 | * the source of the INIT packet. | |
315 | */ | |
316 | retval->transport = chunk->transport; | |
317 | retval->subh.init_hdr = | |
318 | sctp_addto_chunk(retval, sizeof(initack), &initack); | |
319 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); | |
320 | sctp_addto_chunk(retval, cookie_len, cookie); | |
321 | if (asoc->peer.ecn_capable) | |
322 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
323 | if (asoc->peer.prsctp_capable) | |
324 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
325 | ||
326 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND; | |
327 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
328 | aiparam.adaption_ind = htonl(sctp_sk(asoc->base.sk)->adaption_ind); | |
329 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
330 | ||
331 | /* We need to remove the const qualifier at this point. */ | |
332 | retval->asoc = (struct sctp_association *) asoc; | |
333 | ||
334 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
335 | * | |
336 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
337 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
338 | * address from which it received the DATA or control chunk | |
339 | * to which it is replying. | |
340 | * | |
341 | * [INIT ACK back to where the INIT came from.] | |
342 | */ | |
343 | if (chunk) | |
344 | retval->transport = chunk->transport; | |
345 | ||
346 | nomem_chunk: | |
347 | kfree(cookie); | |
348 | nomem_cookie: | |
a51482bd | 349 | kfree(addrs.v); |
1da177e4 LT |
350 | return retval; |
351 | } | |
352 | ||
353 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): | |
354 | * | |
355 | * This chunk is used only during the initialization of an association. | |
356 | * It is sent by the initiator of an association to its peer to complete | |
357 | * the initialization process. This chunk MUST precede any DATA chunk | |
358 | * sent within the association, but MAY be bundled with one or more DATA | |
359 | * chunks in the same packet. | |
360 | * | |
361 | * 0 1 2 3 | |
362 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
363 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
364 | * | Type = 10 |Chunk Flags | Length | | |
365 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
366 | * / Cookie / | |
367 | * \ \ | |
368 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
369 | * | |
370 | * Chunk Flags: 8 bit | |
371 | * | |
372 | * Set to zero on transmit and ignored on receipt. | |
373 | * | |
374 | * Length: 16 bits (unsigned integer) | |
375 | * | |
376 | * Set to the size of the chunk in bytes, including the 4 bytes of | |
377 | * the chunk header and the size of the Cookie. | |
378 | * | |
379 | * Cookie: variable size | |
380 | * | |
381 | * This field must contain the exact cookie received in the | |
382 | * State Cookie parameter from the previous INIT ACK. | |
383 | * | |
384 | * An implementation SHOULD make the cookie as small as possible | |
385 | * to insure interoperability. | |
386 | */ | |
387 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, | |
388 | const struct sctp_chunk *chunk) | |
389 | { | |
390 | struct sctp_chunk *retval; | |
391 | void *cookie; | |
392 | int cookie_len; | |
393 | ||
394 | cookie = asoc->peer.cookie; | |
395 | cookie_len = asoc->peer.cookie_len; | |
396 | ||
397 | /* Build a cookie echo chunk. */ | |
398 | retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); | |
399 | if (!retval) | |
400 | goto nodata; | |
401 | retval->subh.cookie_hdr = | |
402 | sctp_addto_chunk(retval, cookie_len, cookie); | |
403 | ||
404 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
405 | * | |
406 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
407 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
408 | * address from which it * received the DATA or control chunk | |
409 | * to which it is replying. | |
410 | * | |
411 | * [COOKIE ECHO back to where the INIT ACK came from.] | |
412 | */ | |
413 | if (chunk) | |
414 | retval->transport = chunk->transport; | |
415 | ||
416 | nodata: | |
417 | return retval; | |
418 | } | |
419 | ||
420 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): | |
421 | * | |
422 | * This chunk is used only during the initialization of an | |
423 | * association. It is used to acknowledge the receipt of a COOKIE | |
424 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent | |
425 | * within the association, but MAY be bundled with one or more DATA | |
426 | * chunks or SACK chunk in the same SCTP packet. | |
427 | * | |
428 | * 0 1 2 3 | |
429 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
430 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
431 | * | Type = 11 |Chunk Flags | Length = 4 | | |
432 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
433 | * | |
434 | * Chunk Flags: 8 bits | |
435 | * | |
436 | * Set to zero on transmit and ignored on receipt. | |
437 | */ | |
438 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, | |
439 | const struct sctp_chunk *chunk) | |
440 | { | |
441 | struct sctp_chunk *retval; | |
442 | ||
443 | retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); | |
444 | ||
445 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
446 | * | |
447 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
448 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
449 | * address from which it * received the DATA or control chunk | |
450 | * to which it is replying. | |
451 | * | |
452 | * [COOKIE ACK back to where the COOKIE ECHO came from.] | |
453 | */ | |
454 | if (retval && chunk) | |
455 | retval->transport = chunk->transport; | |
456 | ||
457 | return retval; | |
458 | } | |
459 | ||
460 | /* | |
461 | * Appendix A: Explicit Congestion Notification: | |
462 | * CWR: | |
463 | * | |
464 | * RFC 2481 details a specific bit for a sender to send in the header of | |
465 | * its next outbound TCP segment to indicate to its peer that it has | |
466 | * reduced its congestion window. This is termed the CWR bit. For | |
467 | * SCTP the same indication is made by including the CWR chunk. | |
468 | * This chunk contains one data element, i.e. the TSN number that | |
469 | * was sent in the ECNE chunk. This element represents the lowest | |
470 | * TSN number in the datagram that was originally marked with the | |
471 | * CE bit. | |
472 | * | |
473 | * 0 1 2 3 | |
474 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
475 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
476 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | | |
477 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
478 | * | Lowest TSN Number | | |
479 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
480 | * | |
481 | * Note: The CWR is considered a Control chunk. | |
482 | */ | |
483 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, | |
484 | const __u32 lowest_tsn, | |
485 | const struct sctp_chunk *chunk) | |
486 | { | |
487 | struct sctp_chunk *retval; | |
488 | sctp_cwrhdr_t cwr; | |
489 | ||
490 | cwr.lowest_tsn = htonl(lowest_tsn); | |
491 | retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, | |
492 | sizeof(sctp_cwrhdr_t)); | |
493 | ||
494 | if (!retval) | |
495 | goto nodata; | |
496 | ||
497 | retval->subh.ecn_cwr_hdr = | |
498 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); | |
499 | ||
500 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
501 | * | |
502 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
503 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
504 | * address from which it * received the DATA or control chunk | |
505 | * to which it is replying. | |
506 | * | |
507 | * [Report a reduced congestion window back to where the ECNE | |
508 | * came from.] | |
509 | */ | |
510 | if (chunk) | |
511 | retval->transport = chunk->transport; | |
512 | ||
513 | nodata: | |
514 | return retval; | |
515 | } | |
516 | ||
517 | /* Make an ECNE chunk. This is a congestion experienced report. */ | |
518 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, | |
519 | const __u32 lowest_tsn) | |
520 | { | |
521 | struct sctp_chunk *retval; | |
522 | sctp_ecnehdr_t ecne; | |
523 | ||
524 | ecne.lowest_tsn = htonl(lowest_tsn); | |
525 | retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, | |
526 | sizeof(sctp_ecnehdr_t)); | |
527 | if (!retval) | |
528 | goto nodata; | |
529 | retval->subh.ecne_hdr = | |
530 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); | |
531 | ||
532 | nodata: | |
533 | return retval; | |
534 | } | |
535 | ||
536 | /* Make a DATA chunk for the given association from the provided | |
537 | * parameters. However, do not populate the data payload. | |
538 | */ | |
539 | struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, | |
540 | const struct sctp_sndrcvinfo *sinfo, | |
541 | int data_len, __u8 flags, __u16 ssn) | |
542 | { | |
543 | struct sctp_chunk *retval; | |
544 | struct sctp_datahdr dp; | |
545 | int chunk_len; | |
546 | ||
547 | /* We assign the TSN as LATE as possible, not here when | |
548 | * creating the chunk. | |
549 | */ | |
550 | dp.tsn = 0; | |
551 | dp.stream = htons(sinfo->sinfo_stream); | |
552 | dp.ppid = sinfo->sinfo_ppid; | |
553 | ||
554 | /* Set the flags for an unordered send. */ | |
eaa5c54d | 555 | if (sinfo->sinfo_flags & SCTP_UNORDERED) { |
1da177e4 LT |
556 | flags |= SCTP_DATA_UNORDERED; |
557 | dp.ssn = 0; | |
558 | } else | |
559 | dp.ssn = htons(ssn); | |
560 | ||
561 | chunk_len = sizeof(dp) + data_len; | |
562 | retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); | |
563 | if (!retval) | |
564 | goto nodata; | |
565 | ||
566 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
567 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
568 | ||
569 | nodata: | |
570 | return retval; | |
571 | } | |
572 | ||
573 | /* Create a selective ackowledgement (SACK) for the given | |
574 | * association. This reports on which TSN's we've seen to date, | |
575 | * including duplicates and gaps. | |
576 | */ | |
577 | struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) | |
578 | { | |
579 | struct sctp_chunk *retval; | |
580 | struct sctp_sackhdr sack; | |
581 | int len; | |
582 | __u32 ctsn; | |
583 | __u16 num_gabs, num_dup_tsns; | |
584 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; | |
585 | ||
586 | ctsn = sctp_tsnmap_get_ctsn(map); | |
587 | SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); | |
588 | ||
589 | /* How much room is needed in the chunk? */ | |
590 | num_gabs = sctp_tsnmap_num_gabs(map); | |
591 | num_dup_tsns = sctp_tsnmap_num_dups(map); | |
592 | ||
593 | /* Initialize the SACK header. */ | |
594 | sack.cum_tsn_ack = htonl(ctsn); | |
595 | sack.a_rwnd = htonl(asoc->a_rwnd); | |
596 | sack.num_gap_ack_blocks = htons(num_gabs); | |
597 | sack.num_dup_tsns = htons(num_dup_tsns); | |
598 | ||
599 | len = sizeof(sack) | |
600 | + sizeof(struct sctp_gap_ack_block) * num_gabs | |
601 | + sizeof(__u32) * num_dup_tsns; | |
602 | ||
603 | /* Create the chunk. */ | |
604 | retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); | |
605 | if (!retval) | |
606 | goto nodata; | |
607 | ||
608 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
609 | * | |
610 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
611 | * HEARTBEAT ACK, etc.) to the same destination transport | |
612 | * address from which it received the DATA or control chunk to | |
613 | * which it is replying. This rule should also be followed if | |
614 | * the endpoint is bundling DATA chunks together with the | |
615 | * reply chunk. | |
616 | * | |
617 | * However, when acknowledging multiple DATA chunks received | |
618 | * in packets from different source addresses in a single | |
619 | * SACK, the SACK chunk may be transmitted to one of the | |
620 | * destination transport addresses from which the DATA or | |
621 | * control chunks being acknowledged were received. | |
622 | * | |
623 | * [BUG: We do not implement the following paragraph. | |
624 | * Perhaps we should remember the last transport we used for a | |
625 | * SACK and avoid that (if possible) if we have seen any | |
626 | * duplicates. --piggy] | |
627 | * | |
628 | * When a receiver of a duplicate DATA chunk sends a SACK to a | |
629 | * multi- homed endpoint it MAY be beneficial to vary the | |
630 | * destination address and not use the source address of the | |
631 | * DATA chunk. The reason being that receiving a duplicate | |
632 | * from a multi-homed endpoint might indicate that the return | |
633 | * path (as specified in the source address of the DATA chunk) | |
634 | * for the SACK is broken. | |
635 | * | |
636 | * [Send to the address from which we last received a DATA chunk.] | |
637 | */ | |
638 | retval->transport = asoc->peer.last_data_from; | |
639 | ||
640 | retval->subh.sack_hdr = | |
641 | sctp_addto_chunk(retval, sizeof(sack), &sack); | |
642 | ||
643 | /* Add the gap ack block information. */ | |
644 | if (num_gabs) | |
645 | sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, | |
646 | sctp_tsnmap_get_gabs(map)); | |
647 | ||
648 | /* Add the duplicate TSN information. */ | |
649 | if (num_dup_tsns) | |
650 | sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, | |
651 | sctp_tsnmap_get_dups(map)); | |
652 | ||
653 | nodata: | |
654 | return retval; | |
655 | } | |
656 | ||
657 | /* Make a SHUTDOWN chunk. */ | |
658 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, | |
659 | const struct sctp_chunk *chunk) | |
660 | { | |
661 | struct sctp_chunk *retval; | |
662 | sctp_shutdownhdr_t shut; | |
663 | __u32 ctsn; | |
664 | ||
665 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
666 | shut.cum_tsn_ack = htonl(ctsn); | |
667 | ||
668 | retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, | |
669 | sizeof(sctp_shutdownhdr_t)); | |
670 | if (!retval) | |
671 | goto nodata; | |
672 | ||
673 | retval->subh.shutdown_hdr = | |
674 | sctp_addto_chunk(retval, sizeof(shut), &shut); | |
675 | ||
676 | if (chunk) | |
677 | retval->transport = chunk->transport; | |
678 | nodata: | |
679 | return retval; | |
680 | } | |
681 | ||
682 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, | |
683 | const struct sctp_chunk *chunk) | |
684 | { | |
685 | struct sctp_chunk *retval; | |
686 | ||
687 | retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); | |
688 | ||
689 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
690 | * | |
691 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
692 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
693 | * address from which it * received the DATA or control chunk | |
694 | * to which it is replying. | |
695 | * | |
696 | * [ACK back to where the SHUTDOWN came from.] | |
697 | */ | |
698 | if (retval && chunk) | |
699 | retval->transport = chunk->transport; | |
700 | ||
701 | return retval; | |
702 | } | |
703 | ||
704 | struct sctp_chunk *sctp_make_shutdown_complete( | |
705 | const struct sctp_association *asoc, | |
706 | const struct sctp_chunk *chunk) | |
707 | { | |
708 | struct sctp_chunk *retval; | |
709 | __u8 flags = 0; | |
710 | ||
047a2428 JF |
711 | /* Set the T-bit if we have no association (vtag will be |
712 | * reflected) | |
713 | */ | |
1da177e4 LT |
714 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
715 | ||
716 | retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); | |
717 | ||
718 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
719 | * | |
720 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
721 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
722 | * address from which it * received the DATA or control chunk | |
723 | * to which it is replying. | |
724 | * | |
725 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK | |
726 | * came from.] | |
727 | */ | |
728 | if (retval && chunk) | |
729 | retval->transport = chunk->transport; | |
730 | ||
731 | return retval; | |
732 | } | |
733 | ||
734 | /* Create an ABORT. Note that we set the T bit if we have no | |
047a2428 | 735 | * association, except when responding to an INIT (sctpimpguide 2.41). |
1da177e4 LT |
736 | */ |
737 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, | |
738 | const struct sctp_chunk *chunk, | |
739 | const size_t hint) | |
740 | { | |
741 | struct sctp_chunk *retval; | |
742 | __u8 flags = 0; | |
743 | ||
047a2428 JF |
744 | /* Set the T-bit if we have no association and 'chunk' is not |
745 | * an INIT (vtag will be reflected). | |
746 | */ | |
747 | if (!asoc) { | |
748 | if (chunk && chunk->chunk_hdr && | |
749 | chunk->chunk_hdr->type == SCTP_CID_INIT) | |
750 | flags = 0; | |
751 | else | |
752 | flags = SCTP_CHUNK_FLAG_T; | |
753 | } | |
1da177e4 LT |
754 | |
755 | retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); | |
756 | ||
757 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
758 | * | |
759 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
760 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
761 | * address from which it * received the DATA or control chunk | |
762 | * to which it is replying. | |
763 | * | |
764 | * [ABORT back to where the offender came from.] | |
765 | */ | |
766 | if (retval && chunk) | |
767 | retval->transport = chunk->transport; | |
768 | ||
769 | return retval; | |
770 | } | |
771 | ||
772 | /* Helper to create ABORT with a NO_USER_DATA error. */ | |
773 | struct sctp_chunk *sctp_make_abort_no_data( | |
774 | const struct sctp_association *asoc, | |
775 | const struct sctp_chunk *chunk, __u32 tsn) | |
776 | { | |
777 | struct sctp_chunk *retval; | |
778 | __u32 payload; | |
779 | ||
780 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) | |
781 | + sizeof(tsn)); | |
782 | ||
783 | if (!retval) | |
784 | goto no_mem; | |
785 | ||
786 | /* Put the tsn back into network byte order. */ | |
787 | payload = htonl(tsn); | |
788 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, (const void *)&payload, | |
789 | sizeof(payload)); | |
790 | ||
791 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
792 | * | |
793 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
794 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
795 | * address from which it * received the DATA or control chunk | |
796 | * to which it is replying. | |
797 | * | |
798 | * [ABORT back to where the offender came from.] | |
799 | */ | |
800 | if (chunk) | |
801 | retval->transport = chunk->transport; | |
802 | ||
803 | no_mem: | |
804 | return retval; | |
805 | } | |
806 | ||
807 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ | |
808 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, | |
c164a9ba SS |
809 | const struct msghdr *msg, |
810 | size_t paylen) | |
1da177e4 LT |
811 | { |
812 | struct sctp_chunk *retval; | |
c164a9ba SS |
813 | void *payload = NULL; |
814 | int err; | |
1da177e4 | 815 | |
c164a9ba | 816 | retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); |
1da177e4 LT |
817 | if (!retval) |
818 | goto err_chunk; | |
819 | ||
820 | if (paylen) { | |
821 | /* Put the msg_iov together into payload. */ | |
c164a9ba | 822 | payload = kmalloc(paylen, GFP_KERNEL); |
1da177e4 LT |
823 | if (!payload) |
824 | goto err_payload; | |
c164a9ba SS |
825 | |
826 | err = memcpy_fromiovec(payload, msg->msg_iov, paylen); | |
827 | if (err < 0) | |
828 | goto err_copy; | |
1da177e4 LT |
829 | } |
830 | ||
831 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, payload, paylen); | |
832 | ||
833 | if (paylen) | |
834 | kfree(payload); | |
835 | ||
836 | return retval; | |
837 | ||
838 | err_copy: | |
839 | kfree(payload); | |
840 | err_payload: | |
841 | sctp_chunk_free(retval); | |
842 | retval = NULL; | |
843 | err_chunk: | |
844 | return retval; | |
845 | } | |
846 | ||
847 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ | |
848 | struct sctp_chunk *sctp_make_abort_violation( | |
849 | const struct sctp_association *asoc, | |
850 | const struct sctp_chunk *chunk, | |
851 | const __u8 *payload, | |
852 | const size_t paylen) | |
853 | { | |
854 | struct sctp_chunk *retval; | |
855 | struct sctp_paramhdr phdr; | |
856 | ||
857 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen | |
858 | + sizeof(sctp_chunkhdr_t)); | |
859 | if (!retval) | |
860 | goto end; | |
861 | ||
862 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, payload, paylen); | |
863 | ||
864 | phdr.type = htons(chunk->chunk_hdr->type); | |
865 | phdr.length = chunk->chunk_hdr->length; | |
866 | sctp_addto_chunk(retval, sizeof(sctp_paramhdr_t), &phdr); | |
867 | ||
868 | end: | |
869 | return retval; | |
870 | } | |
871 | ||
872 | /* Make a HEARTBEAT chunk. */ | |
873 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, | |
874 | const struct sctp_transport *transport, | |
875 | const void *payload, const size_t paylen) | |
876 | { | |
877 | struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, | |
878 | 0, paylen); | |
879 | ||
880 | if (!retval) | |
881 | goto nodata; | |
882 | ||
883 | /* Cast away the 'const', as this is just telling the chunk | |
884 | * what transport it belongs to. | |
885 | */ | |
886 | retval->transport = (struct sctp_transport *) transport; | |
887 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
888 | ||
889 | nodata: | |
890 | return retval; | |
891 | } | |
892 | ||
893 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, | |
894 | const struct sctp_chunk *chunk, | |
895 | const void *payload, const size_t paylen) | |
896 | { | |
897 | struct sctp_chunk *retval; | |
898 | ||
899 | retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); | |
900 | if (!retval) | |
901 | goto nodata; | |
902 | ||
903 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
904 | ||
905 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
906 | * | |
907 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
908 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
909 | * address from which it * received the DATA or control chunk | |
910 | * to which it is replying. | |
911 | * | |
912 | * [HBACK back to where the HEARTBEAT came from.] | |
913 | */ | |
914 | if (chunk) | |
915 | retval->transport = chunk->transport; | |
916 | ||
917 | nodata: | |
918 | return retval; | |
919 | } | |
920 | ||
921 | /* Create an Operation Error chunk with the specified space reserved. | |
922 | * This routine can be used for containing multiple causes in the chunk. | |
923 | */ | |
924 | static struct sctp_chunk *sctp_make_op_error_space( | |
925 | const struct sctp_association *asoc, | |
926 | const struct sctp_chunk *chunk, | |
927 | size_t size) | |
928 | { | |
929 | struct sctp_chunk *retval; | |
930 | ||
931 | retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, | |
932 | sizeof(sctp_errhdr_t) + size); | |
933 | if (!retval) | |
934 | goto nodata; | |
935 | ||
936 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
937 | * | |
938 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
939 | * HEARTBEAT ACK, etc.) to the same destination transport | |
940 | * address from which it received the DATA or control chunk | |
941 | * to which it is replying. | |
942 | * | |
943 | */ | |
944 | if (chunk) | |
945 | retval->transport = chunk->transport; | |
946 | ||
947 | nodata: | |
948 | return retval; | |
949 | } | |
950 | ||
951 | /* Create an Operation Error chunk. */ | |
952 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, | |
953 | const struct sctp_chunk *chunk, | |
63706c5c | 954 | __be16 cause_code, const void *payload, |
1da177e4 LT |
955 | size_t paylen) |
956 | { | |
957 | struct sctp_chunk *retval; | |
958 | ||
959 | retval = sctp_make_op_error_space(asoc, chunk, paylen); | |
960 | if (!retval) | |
961 | goto nodata; | |
962 | ||
963 | sctp_init_cause(retval, cause_code, payload, paylen); | |
964 | ||
965 | nodata: | |
966 | return retval; | |
967 | } | |
968 | ||
969 | /******************************************************************** | |
970 | * 2nd Level Abstractions | |
971 | ********************************************************************/ | |
972 | ||
973 | /* Turn an skb into a chunk. | |
974 | * FIXME: Eventually move the structure directly inside the skb->cb[]. | |
975 | */ | |
976 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, | |
977 | const struct sctp_association *asoc, | |
978 | struct sock *sk) | |
979 | { | |
980 | struct sctp_chunk *retval; | |
981 | ||
982 | retval = kmem_cache_alloc(sctp_chunk_cachep, SLAB_ATOMIC); | |
983 | ||
984 | if (!retval) | |
985 | goto nodata; | |
986 | memset(retval, 0, sizeof(struct sctp_chunk)); | |
987 | ||
988 | if (!sk) { | |
989 | SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); | |
990 | } | |
991 | ||
79af02c2 | 992 | INIT_LIST_HEAD(&retval->list); |
1da177e4 LT |
993 | retval->skb = skb; |
994 | retval->asoc = (struct sctp_association *)asoc; | |
995 | retval->resent = 0; | |
996 | retval->has_tsn = 0; | |
997 | retval->has_ssn = 0; | |
998 | retval->rtt_in_progress = 0; | |
999 | retval->sent_at = 0; | |
1000 | retval->singleton = 1; | |
1001 | retval->end_of_packet = 0; | |
1002 | retval->ecn_ce_done = 0; | |
1003 | retval->pdiscard = 0; | |
1004 | ||
1005 | /* sctpimpguide-05.txt Section 2.8.2 | |
1006 | * M1) Each time a new DATA chunk is transmitted | |
1007 | * set the 'TSN.Missing.Report' count for that TSN to 0. The | |
1008 | * 'TSN.Missing.Report' count will be used to determine missing chunks | |
1009 | * and when to fast retransmit. | |
1010 | */ | |
1011 | retval->tsn_missing_report = 0; | |
1012 | retval->tsn_gap_acked = 0; | |
1013 | retval->fast_retransmit = 0; | |
1014 | ||
1015 | /* If this is a fragmented message, track all fragments | |
1016 | * of the message (for SEND_FAILED). | |
1017 | */ | |
1018 | retval->msg = NULL; | |
1019 | ||
1020 | /* Polish the bead hole. */ | |
1021 | INIT_LIST_HEAD(&retval->transmitted_list); | |
1022 | INIT_LIST_HEAD(&retval->frag_list); | |
1023 | SCTP_DBG_OBJCNT_INC(chunk); | |
1024 | atomic_set(&retval->refcnt, 1); | |
1025 | ||
1026 | nodata: | |
1027 | return retval; | |
1028 | } | |
1029 | ||
1030 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ | |
1031 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, | |
1032 | union sctp_addr *dest) | |
1033 | { | |
f235fca3 AV |
1034 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
1035 | flip_to_h(&chunk->source_h, &chunk->source); | |
1036 | flip_to_h(&chunk->dest, dest); | |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | /* Extract the source address from a chunk. */ | |
1040 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) | |
1041 | { | |
1042 | /* If we have a known transport, use that. */ | |
1043 | if (chunk->transport) { | |
09ef7fec | 1044 | return &chunk->transport->ipaddr_h; |
1da177e4 LT |
1045 | } else { |
1046 | /* Otherwise, extract it from the IP header. */ | |
09ef7fec | 1047 | return &chunk->source_h; |
1da177e4 LT |
1048 | } |
1049 | } | |
1050 | ||
1051 | /* Create a new chunk, setting the type and flags headers from the | |
1052 | * arguments, reserving enough space for a 'paylen' byte payload. | |
1053 | */ | |
1054 | SCTP_STATIC | |
1055 | struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, | |
1056 | __u8 type, __u8 flags, int paylen) | |
1057 | { | |
1058 | struct sctp_chunk *retval; | |
1059 | sctp_chunkhdr_t *chunk_hdr; | |
1060 | struct sk_buff *skb; | |
1061 | struct sock *sk; | |
1062 | ||
1063 | /* No need to allocate LL here, as this is only a chunk. */ | |
1064 | skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), | |
1065 | GFP_ATOMIC); | |
1066 | if (!skb) | |
1067 | goto nodata; | |
1068 | ||
1069 | /* Make room for the chunk header. */ | |
1070 | chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); | |
1071 | chunk_hdr->type = type; | |
1072 | chunk_hdr->flags = flags; | |
1073 | chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); | |
1074 | ||
1075 | sk = asoc ? asoc->base.sk : NULL; | |
1076 | retval = sctp_chunkify(skb, asoc, sk); | |
1077 | if (!retval) { | |
1078 | kfree_skb(skb); | |
1079 | goto nodata; | |
1080 | } | |
1081 | ||
1082 | retval->chunk_hdr = chunk_hdr; | |
1083 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); | |
1084 | ||
1085 | /* Set the skb to the belonging sock for accounting. */ | |
1086 | skb->sk = sk; | |
1087 | ||
1088 | return retval; | |
1089 | nodata: | |
1090 | return NULL; | |
1091 | } | |
1092 | ||
1093 | ||
1094 | /* Release the memory occupied by a chunk. */ | |
1095 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) | |
1096 | { | |
1097 | /* Free the chunk skb data and the SCTP_chunk stub itself. */ | |
1098 | dev_kfree_skb(chunk->skb); | |
1099 | ||
1100 | SCTP_DBG_OBJCNT_DEC(chunk); | |
1101 | kmem_cache_free(sctp_chunk_cachep, chunk); | |
1102 | } | |
1103 | ||
1104 | /* Possibly, free the chunk. */ | |
1105 | void sctp_chunk_free(struct sctp_chunk *chunk) | |
1106 | { | |
79af02c2 | 1107 | BUG_ON(!list_empty(&chunk->list)); |
1da177e4 LT |
1108 | list_del_init(&chunk->transmitted_list); |
1109 | ||
1110 | /* Release our reference on the message tracker. */ | |
1111 | if (chunk->msg) | |
1112 | sctp_datamsg_put(chunk->msg); | |
1113 | ||
1114 | sctp_chunk_put(chunk); | |
1115 | } | |
1116 | ||
1117 | /* Grab a reference to the chunk. */ | |
1118 | void sctp_chunk_hold(struct sctp_chunk *ch) | |
1119 | { | |
1120 | atomic_inc(&ch->refcnt); | |
1121 | } | |
1122 | ||
1123 | /* Release a reference to the chunk. */ | |
1124 | void sctp_chunk_put(struct sctp_chunk *ch) | |
1125 | { | |
1126 | if (atomic_dec_and_test(&ch->refcnt)) | |
1127 | sctp_chunk_destroy(ch); | |
1128 | } | |
1129 | ||
1130 | /* Append bytes to the end of a chunk. Will panic if chunk is not big | |
1131 | * enough. | |
1132 | */ | |
1133 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) | |
1134 | { | |
1135 | void *target; | |
1136 | void *padding; | |
1137 | int chunklen = ntohs(chunk->chunk_hdr->length); | |
1138 | int padlen = chunklen % 4; | |
1139 | ||
1140 | padding = skb_put(chunk->skb, padlen); | |
1141 | target = skb_put(chunk->skb, len); | |
1142 | ||
1143 | memset(padding, 0, padlen); | |
1144 | memcpy(target, data, len); | |
1145 | ||
1146 | /* Adjust the chunk length field. */ | |
1147 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); | |
1148 | chunk->chunk_end = chunk->skb->tail; | |
1149 | ||
1150 | return target; | |
1151 | } | |
1152 | ||
1153 | /* Append bytes from user space to the end of a chunk. Will panic if | |
1154 | * chunk is not big enough. | |
1155 | * Returns a kernel err value. | |
1156 | */ | |
1157 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, | |
1158 | struct iovec *data) | |
1159 | { | |
1160 | __u8 *target; | |
1161 | int err = 0; | |
1162 | ||
1163 | /* Make room in chunk for data. */ | |
1164 | target = skb_put(chunk->skb, len); | |
1165 | ||
1166 | /* Copy data (whole iovec) into chunk */ | |
1167 | if ((err = memcpy_fromiovecend(target, data, off, len))) | |
1168 | goto out; | |
1169 | ||
1170 | /* Adjust the chunk length field. */ | |
1171 | chunk->chunk_hdr->length = | |
1172 | htons(ntohs(chunk->chunk_hdr->length) + len); | |
1173 | chunk->chunk_end = chunk->skb->tail; | |
1174 | ||
1175 | out: | |
1176 | return err; | |
1177 | } | |
1178 | ||
1179 | /* Helper function to assign a TSN if needed. This assumes that both | |
1180 | * the data_hdr and association have already been assigned. | |
1181 | */ | |
1182 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) | |
1183 | { | |
1184 | __u16 ssn; | |
1185 | __u16 sid; | |
1186 | ||
1187 | if (chunk->has_ssn) | |
1188 | return; | |
1189 | ||
1190 | /* This is the last possible instant to assign a SSN. */ | |
1191 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
1192 | ssn = 0; | |
1193 | } else { | |
dbc16db1 | 1194 | sid = ntohs(chunk->subh.data_hdr->stream); |
1da177e4 LT |
1195 | if (chunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) |
1196 | ssn = sctp_ssn_next(&chunk->asoc->ssnmap->out, sid); | |
1197 | else | |
1198 | ssn = sctp_ssn_peek(&chunk->asoc->ssnmap->out, sid); | |
1199 | ssn = htons(ssn); | |
1200 | } | |
1201 | ||
1202 | chunk->subh.data_hdr->ssn = ssn; | |
1203 | chunk->has_ssn = 1; | |
1204 | } | |
1205 | ||
1206 | /* Helper function to assign a TSN if needed. This assumes that both | |
1207 | * the data_hdr and association have already been assigned. | |
1208 | */ | |
1209 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) | |
1210 | { | |
1211 | if (!chunk->has_tsn) { | |
1212 | /* This is the last possible instant to | |
1213 | * assign a TSN. | |
1214 | */ | |
1215 | chunk->subh.data_hdr->tsn = | |
1216 | htonl(sctp_association_get_next_tsn(chunk->asoc)); | |
1217 | chunk->has_tsn = 1; | |
1218 | } | |
1219 | } | |
1220 | ||
1221 | /* Create a CLOSED association to use with an incoming packet. */ | |
1222 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, | |
3182cd84 | 1223 | struct sctp_chunk *chunk, |
dd0fc66f | 1224 | gfp_t gfp) |
1da177e4 LT |
1225 | { |
1226 | struct sctp_association *asoc; | |
1227 | struct sk_buff *skb; | |
1228 | sctp_scope_t scope; | |
1229 | struct sctp_af *af; | |
1230 | ||
1231 | /* Create the bare association. */ | |
1232 | scope = sctp_scope(sctp_source(chunk)); | |
1233 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1234 | if (!asoc) | |
1235 | goto nodata; | |
1236 | asoc->temp = 1; | |
1237 | skb = chunk->skb; | |
1238 | /* Create an entry for the source address of the packet. */ | |
1239 | af = sctp_get_af_specific(ipver2af(skb->nh.iph->version)); | |
1240 | if (unlikely(!af)) | |
1241 | goto fail; | |
d55c41b1 | 1242 | af->from_skb(&asoc->c.peer_addr, skb, 1); |
1da177e4 LT |
1243 | nodata: |
1244 | return asoc; | |
1245 | ||
1246 | fail: | |
1247 | sctp_association_free(asoc); | |
1248 | return NULL; | |
1249 | } | |
1250 | ||
1251 | /* Build a cookie representing asoc. | |
1252 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. | |
1253 | */ | |
1254 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, | |
1255 | const struct sctp_association *asoc, | |
1256 | const struct sctp_chunk *init_chunk, | |
1257 | int *cookie_len, | |
1258 | const __u8 *raw_addrs, int addrs_len) | |
1259 | { | |
1260 | sctp_cookie_param_t *retval; | |
1261 | struct sctp_signed_cookie *cookie; | |
1262 | struct scatterlist sg; | |
1263 | int headersize, bodysize; | |
1264 | unsigned int keylen; | |
1265 | char *key; | |
1266 | ||
9834a2bb VY |
1267 | /* Header size is static data prior to the actual cookie, including |
1268 | * any padding. | |
1269 | */ | |
1270 | headersize = sizeof(sctp_paramhdr_t) + | |
1271 | (sizeof(struct sctp_signed_cookie) - | |
1272 | sizeof(struct sctp_cookie)); | |
1da177e4 LT |
1273 | bodysize = sizeof(struct sctp_cookie) |
1274 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; | |
1275 | ||
1276 | /* Pad out the cookie to a multiple to make the signature | |
1277 | * functions simpler to write. | |
1278 | */ | |
1279 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1280 | bodysize += SCTP_COOKIE_MULTIPLE | |
1281 | - (bodysize % SCTP_COOKIE_MULTIPLE); | |
1282 | *cookie_len = headersize + bodysize; | |
1283 | ||
8b3a7005 | 1284 | retval = kmalloc(*cookie_len, GFP_ATOMIC); |
1da177e4 | 1285 | |
1b489e11 | 1286 | if (!retval) |
1da177e4 | 1287 | goto nodata; |
1da177e4 LT |
1288 | |
1289 | /* Clear this memory since we are sending this data structure | |
1290 | * out on the network. | |
1291 | */ | |
1292 | memset(retval, 0x00, *cookie_len); | |
1293 | cookie = (struct sctp_signed_cookie *) retval->body; | |
1294 | ||
1295 | /* Set up the parameter header. */ | |
1296 | retval->p.type = SCTP_PARAM_STATE_COOKIE; | |
1297 | retval->p.length = htons(*cookie_len); | |
1298 | ||
1299 | /* Copy the cookie part of the association itself. */ | |
1300 | cookie->c = asoc->c; | |
1301 | /* Save the raw address list length in the cookie. */ | |
1302 | cookie->c.raw_addr_list_len = addrs_len; | |
1303 | ||
1304 | /* Remember PR-SCTP capability. */ | |
1305 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; | |
1306 | ||
1307 | /* Save adaption indication in the cookie. */ | |
1308 | cookie->c.adaption_ind = asoc->peer.adaption_ind; | |
1309 | ||
1310 | /* Set an expiration time for the cookie. */ | |
1311 | do_gettimeofday(&cookie->c.expiration); | |
1312 | TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); | |
1313 | ||
1314 | /* Copy the peer's init packet. */ | |
1315 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, | |
1316 | ntohs(init_chunk->chunk_hdr->length)); | |
1317 | ||
1318 | /* Copy the raw local address list of the association. */ | |
1319 | memcpy((__u8 *)&cookie->c.peer_init[0] + | |
1320 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); | |
1321 | ||
1322 | if (sctp_sk(ep->base.sk)->hmac) { | |
1b489e11 HX |
1323 | struct hash_desc desc; |
1324 | ||
1da177e4 LT |
1325 | /* Sign the message. */ |
1326 | sg.page = virt_to_page(&cookie->c); | |
1327 | sg.offset = (unsigned long)(&cookie->c) % PAGE_SIZE; | |
1328 | sg.length = bodysize; | |
1329 | keylen = SCTP_SECRET_SIZE; | |
1330 | key = (char *)ep->secret_key[ep->current_key]; | |
1b489e11 HX |
1331 | desc.tfm = sctp_sk(ep->base.sk)->hmac; |
1332 | desc.flags = 0; | |
1da177e4 | 1333 | |
1b489e11 HX |
1334 | if (crypto_hash_setkey(desc.tfm, key, keylen) || |
1335 | crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) | |
1336 | goto free_cookie; | |
1da177e4 LT |
1337 | } |
1338 | ||
1da177e4 | 1339 | return retval; |
1b489e11 HX |
1340 | |
1341 | free_cookie: | |
1342 | kfree(retval); | |
1343 | nodata: | |
1344 | *cookie_len = 0; | |
1345 | return NULL; | |
1da177e4 LT |
1346 | } |
1347 | ||
1348 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ | |
1349 | struct sctp_association *sctp_unpack_cookie( | |
1350 | const struct sctp_endpoint *ep, | |
1351 | const struct sctp_association *asoc, | |
dd0fc66f | 1352 | struct sctp_chunk *chunk, gfp_t gfp, |
1da177e4 LT |
1353 | int *error, struct sctp_chunk **errp) |
1354 | { | |
1355 | struct sctp_association *retval = NULL; | |
1356 | struct sctp_signed_cookie *cookie; | |
1357 | struct sctp_cookie *bear_cookie; | |
1358 | int headersize, bodysize, fixed_size; | |
313e7b4d | 1359 | __u8 *digest = ep->digest; |
1da177e4 LT |
1360 | struct scatterlist sg; |
1361 | unsigned int keylen, len; | |
1362 | char *key; | |
1363 | sctp_scope_t scope; | |
1364 | struct sk_buff *skb = chunk->skb; | |
a61bbcf2 | 1365 | struct timeval tv; |
1b489e11 | 1366 | struct hash_desc desc; |
1da177e4 | 1367 | |
9834a2bb VY |
1368 | /* Header size is static data prior to the actual cookie, including |
1369 | * any padding. | |
1370 | */ | |
1371 | headersize = sizeof(sctp_chunkhdr_t) + | |
1372 | (sizeof(struct sctp_signed_cookie) - | |
1373 | sizeof(struct sctp_cookie)); | |
1da177e4 LT |
1374 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
1375 | fixed_size = headersize + sizeof(struct sctp_cookie); | |
1376 | ||
1377 | /* Verify that the chunk looks like it even has a cookie. | |
1378 | * There must be enough room for our cookie and our peer's | |
1379 | * INIT chunk. | |
1380 | */ | |
1381 | len = ntohs(chunk->chunk_hdr->length); | |
1382 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) | |
1383 | goto malformed; | |
1384 | ||
1385 | /* Verify that the cookie has been padded out. */ | |
1386 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1387 | goto malformed; | |
1388 | ||
1389 | /* Process the cookie. */ | |
1390 | cookie = chunk->subh.cookie_hdr; | |
1391 | bear_cookie = &cookie->c; | |
1392 | ||
1393 | if (!sctp_sk(ep->base.sk)->hmac) | |
1394 | goto no_hmac; | |
1395 | ||
1396 | /* Check the signature. */ | |
1397 | keylen = SCTP_SECRET_SIZE; | |
1398 | sg.page = virt_to_page(bear_cookie); | |
1399 | sg.offset = (unsigned long)(bear_cookie) % PAGE_SIZE; | |
1400 | sg.length = bodysize; | |
1401 | key = (char *)ep->secret_key[ep->current_key]; | |
1b489e11 HX |
1402 | desc.tfm = sctp_sk(ep->base.sk)->hmac; |
1403 | desc.flags = 0; | |
1da177e4 | 1404 | |
8ca84481 | 1405 | memset(digest, 0x00, SCTP_SIGNATURE_SIZE); |
1b489e11 HX |
1406 | if (crypto_hash_setkey(desc.tfm, key, keylen) || |
1407 | crypto_hash_digest(&desc, &sg, bodysize, digest)) { | |
1408 | *error = -SCTP_IERROR_NOMEM; | |
1409 | goto fail; | |
1410 | } | |
1da177e4 LT |
1411 | |
1412 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { | |
1413 | /* Try the previous key. */ | |
1414 | key = (char *)ep->secret_key[ep->last_key]; | |
8ca84481 | 1415 | memset(digest, 0x00, SCTP_SIGNATURE_SIZE); |
1b489e11 HX |
1416 | if (crypto_hash_setkey(desc.tfm, key, keylen) || |
1417 | crypto_hash_digest(&desc, &sg, bodysize, digest)) { | |
1418 | *error = -SCTP_IERROR_NOMEM; | |
1419 | goto fail; | |
1420 | } | |
1da177e4 LT |
1421 | |
1422 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { | |
1423 | /* Yikes! Still bad signature! */ | |
1424 | *error = -SCTP_IERROR_BAD_SIG; | |
1425 | goto fail; | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | no_hmac: | |
1430 | /* IG Section 2.35.2: | |
1431 | * 3) Compare the port numbers and the verification tag contained | |
1432 | * within the COOKIE ECHO chunk to the actual port numbers and the | |
1433 | * verification tag within the SCTP common header of the received | |
1434 | * packet. If these values do not match the packet MUST be silently | |
1435 | * discarded, | |
1436 | */ | |
1437 | if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { | |
1438 | *error = -SCTP_IERROR_BAD_TAG; | |
1439 | goto fail; | |
1440 | } | |
1441 | ||
9b1dfad0 | 1442 | if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || |
1da177e4 LT |
1443 | ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { |
1444 | *error = -SCTP_IERROR_BAD_PORTS; | |
1445 | goto fail; | |
1446 | } | |
1447 | ||
1448 | /* Check to see if the cookie is stale. If there is already | |
1449 | * an association, there is no need to check cookie's expiration | |
1450 | * for init collision case of lost COOKIE ACK. | |
f236218b VY |
1451 | * If skb has been timestamped, then use the stamp, otherwise |
1452 | * use current time. This introduces a small possibility that | |
1453 | * that a cookie may be considered expired, but his would only slow | |
1454 | * down the new association establishment instead of every packet. | |
1da177e4 | 1455 | */ |
f236218b VY |
1456 | if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) |
1457 | skb_get_timestamp(skb, &tv); | |
1458 | else | |
1459 | do_gettimeofday(&tv); | |
1460 | ||
a61bbcf2 | 1461 | if (!asoc && tv_lt(bear_cookie->expiration, tv)) { |
1da177e4 LT |
1462 | __u16 len; |
1463 | /* | |
1464 | * Section 3.3.10.3 Stale Cookie Error (3) | |
1465 | * | |
1466 | * Cause of error | |
1467 | * --------------- | |
1468 | * Stale Cookie Error: Indicates the receipt of a valid State | |
1469 | * Cookie that has expired. | |
1470 | */ | |
1471 | len = ntohs(chunk->chunk_hdr->length); | |
1472 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1473 | if (*errp) { | |
a61bbcf2 | 1474 | suseconds_t usecs = (tv.tv_sec - |
1da177e4 | 1475 | bear_cookie->expiration.tv_sec) * 1000000L + |
a61bbcf2 | 1476 | tv.tv_usec - bear_cookie->expiration.tv_usec; |
1da177e4 LT |
1477 | |
1478 | usecs = htonl(usecs); | |
1479 | sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, | |
1480 | &usecs, sizeof(usecs)); | |
1481 | *error = -SCTP_IERROR_STALE_COOKIE; | |
1482 | } else | |
1483 | *error = -SCTP_IERROR_NOMEM; | |
1484 | ||
1485 | goto fail; | |
1486 | } | |
1487 | ||
1488 | /* Make a new base association. */ | |
1489 | scope = sctp_scope(sctp_source(chunk)); | |
1490 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1491 | if (!retval) { | |
1492 | *error = -SCTP_IERROR_NOMEM; | |
1493 | goto fail; | |
1494 | } | |
1495 | ||
1496 | /* Set up our peer's port number. */ | |
1497 | retval->peer.port = ntohs(chunk->sctp_hdr->source); | |
1498 | ||
1499 | /* Populate the association from the cookie. */ | |
1500 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); | |
1501 | ||
1502 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, | |
1503 | GFP_ATOMIC) < 0) { | |
1504 | *error = -SCTP_IERROR_NOMEM; | |
1505 | goto fail; | |
1506 | } | |
1507 | ||
1508 | /* Also, add the destination address. */ | |
1509 | if (list_empty(&retval->base.bind_addr.address_list)) { | |
dc022a98 | 1510 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1, |
1da177e4 LT |
1511 | GFP_ATOMIC); |
1512 | } | |
1513 | ||
1514 | retval->next_tsn = retval->c.initial_tsn; | |
1515 | retval->ctsn_ack_point = retval->next_tsn - 1; | |
1516 | retval->addip_serial = retval->c.initial_tsn; | |
1517 | retval->adv_peer_ack_point = retval->ctsn_ack_point; | |
1518 | retval->peer.prsctp_capable = retval->c.prsctp_capable; | |
1519 | retval->peer.adaption_ind = retval->c.adaption_ind; | |
1520 | ||
1521 | /* The INIT stuff will be done by the side effects. */ | |
1522 | return retval; | |
1523 | ||
1524 | fail: | |
1525 | if (retval) | |
1526 | sctp_association_free(retval); | |
1527 | ||
1528 | return NULL; | |
1529 | ||
1530 | malformed: | |
1531 | /* Yikes! The packet is either corrupt or deliberately | |
1532 | * malformed. | |
1533 | */ | |
1534 | *error = -SCTP_IERROR_MALFORMED; | |
1535 | goto fail; | |
1536 | } | |
1537 | ||
1538 | /******************************************************************** | |
1539 | * 3rd Level Abstractions | |
1540 | ********************************************************************/ | |
1541 | ||
1542 | struct __sctp_missing { | |
1543 | __u32 num_missing; | |
1544 | __u16 type; | |
1545 | } __attribute__((packed)); | |
1546 | ||
1547 | /* | |
1548 | * Report a missing mandatory parameter. | |
1549 | */ | |
1550 | static int sctp_process_missing_param(const struct sctp_association *asoc, | |
1551 | sctp_param_t paramtype, | |
1552 | struct sctp_chunk *chunk, | |
1553 | struct sctp_chunk **errp) | |
1554 | { | |
1555 | struct __sctp_missing report; | |
1556 | __u16 len; | |
1557 | ||
1558 | len = WORD_ROUND(sizeof(report)); | |
1559 | ||
1560 | /* Make an ERROR chunk, preparing enough room for | |
1561 | * returning multiple unknown parameters. | |
1562 | */ | |
1563 | if (!*errp) | |
1564 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1565 | ||
1566 | if (*errp) { | |
1567 | report.num_missing = htonl(1); | |
1568 | report.type = paramtype; | |
1569 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, | |
1570 | &report, sizeof(report)); | |
1571 | } | |
1572 | ||
1573 | /* Stop processing this chunk. */ | |
1574 | return 0; | |
1575 | } | |
1576 | ||
1577 | /* Report an Invalid Mandatory Parameter. */ | |
1578 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, | |
1579 | struct sctp_chunk *chunk, | |
1580 | struct sctp_chunk **errp) | |
1581 | { | |
1582 | /* Invalid Mandatory Parameter Error has no payload. */ | |
1583 | ||
1584 | if (!*errp) | |
1585 | *errp = sctp_make_op_error_space(asoc, chunk, 0); | |
1586 | ||
1587 | if (*errp) | |
1588 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, NULL, 0); | |
1589 | ||
1590 | /* Stop processing this chunk. */ | |
1591 | return 0; | |
1592 | } | |
1593 | ||
1594 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, | |
1595 | struct sctp_paramhdr *param, | |
1596 | const struct sctp_chunk *chunk, | |
1597 | struct sctp_chunk **errp) | |
1598 | { | |
1599 | char error[] = "The following parameter had invalid length:"; | |
1600 | size_t payload_len = WORD_ROUND(sizeof(error)) + | |
1601 | sizeof(sctp_paramhdr_t); | |
1602 | ||
1603 | ||
1604 | /* Create an error chunk and fill it in with our payload. */ | |
1605 | if (!*errp) | |
1606 | *errp = sctp_make_op_error_space(asoc, chunk, payload_len); | |
1607 | ||
1608 | if (*errp) { | |
1609 | sctp_init_cause(*errp, SCTP_ERROR_PROTO_VIOLATION, error, | |
1610 | sizeof(error)); | |
1611 | sctp_addto_chunk(*errp, sizeof(sctp_paramhdr_t), param); | |
1612 | } | |
1613 | ||
1614 | return 0; | |
1615 | } | |
1616 | ||
1617 | ||
1618 | /* Do not attempt to handle the HOST_NAME parm. However, do | |
1619 | * send back an indicator to the peer. | |
1620 | */ | |
1621 | static int sctp_process_hn_param(const struct sctp_association *asoc, | |
1622 | union sctp_params param, | |
1623 | struct sctp_chunk *chunk, | |
1624 | struct sctp_chunk **errp) | |
1625 | { | |
1626 | __u16 len = ntohs(param.p->length); | |
1627 | ||
1628 | /* Make an ERROR chunk. */ | |
1629 | if (!*errp) | |
1630 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1631 | ||
1632 | if (*errp) | |
1633 | sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, | |
1634 | param.v, len); | |
1635 | ||
1636 | /* Stop processing this chunk. */ | |
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | /* RFC 3.2.1 & the Implementers Guide 2.2. | |
1641 | * | |
1642 | * The Parameter Types are encoded such that the | |
1643 | * highest-order two bits specify the action that must be | |
1644 | * taken if the processing endpoint does not recognize the | |
1645 | * Parameter Type. | |
1646 | * | |
1647 | * 00 - Stop processing this SCTP chunk and discard it, | |
1648 | * do not process any further chunks within it. | |
1649 | * | |
1650 | * 01 - Stop processing this SCTP chunk and discard it, | |
1651 | * do not process any further chunks within it, and report | |
1652 | * the unrecognized parameter in an 'Unrecognized | |
1653 | * Parameter Type' (in either an ERROR or in the INIT ACK). | |
1654 | * | |
1655 | * 10 - Skip this parameter and continue processing. | |
1656 | * | |
1657 | * 11 - Skip this parameter and continue processing but | |
1658 | * report the unrecognized parameter in an | |
1659 | * 'Unrecognized Parameter Type' (in either an ERROR or in | |
1660 | * the INIT ACK). | |
1661 | * | |
1662 | * Return value: | |
1663 | * 0 - discard the chunk | |
1664 | * 1 - continue with the chunk | |
1665 | */ | |
1666 | static int sctp_process_unk_param(const struct sctp_association *asoc, | |
1667 | union sctp_params param, | |
1668 | struct sctp_chunk *chunk, | |
1669 | struct sctp_chunk **errp) | |
1670 | { | |
1671 | int retval = 1; | |
1672 | ||
1673 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { | |
1674 | case SCTP_PARAM_ACTION_DISCARD: | |
1675 | retval = 0; | |
1676 | break; | |
1677 | case SCTP_PARAM_ACTION_DISCARD_ERR: | |
1678 | retval = 0; | |
1679 | /* Make an ERROR chunk, preparing enough room for | |
1680 | * returning multiple unknown parameters. | |
1681 | */ | |
1682 | if (NULL == *errp) | |
1683 | *errp = sctp_make_op_error_space(asoc, chunk, | |
1684 | ntohs(chunk->chunk_hdr->length)); | |
1685 | ||
1686 | if (*errp) | |
1687 | sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, | |
1688 | param.v, | |
1689 | WORD_ROUND(ntohs(param.p->length))); | |
1690 | ||
1691 | break; | |
1692 | case SCTP_PARAM_ACTION_SKIP: | |
1693 | break; | |
1694 | case SCTP_PARAM_ACTION_SKIP_ERR: | |
1695 | /* Make an ERROR chunk, preparing enough room for | |
1696 | * returning multiple unknown parameters. | |
1697 | */ | |
1698 | if (NULL == *errp) | |
1699 | *errp = sctp_make_op_error_space(asoc, chunk, | |
1700 | ntohs(chunk->chunk_hdr->length)); | |
1701 | ||
1702 | if (*errp) { | |
1703 | sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, | |
1704 | param.v, | |
1705 | WORD_ROUND(ntohs(param.p->length))); | |
1706 | } else { | |
1707 | /* If there is no memory for generating the ERROR | |
1708 | * report as specified, an ABORT will be triggered | |
1709 | * to the peer and the association won't be | |
1710 | * established. | |
1711 | */ | |
1712 | retval = 0; | |
1713 | } | |
1714 | ||
1715 | break; | |
1716 | default: | |
1717 | break; | |
1718 | } | |
1719 | ||
1720 | return retval; | |
1721 | } | |
1722 | ||
1723 | /* Find unrecognized parameters in the chunk. | |
1724 | * Return values: | |
1725 | * 0 - discard the chunk | |
1726 | * 1 - continue with the chunk | |
1727 | */ | |
1728 | static int sctp_verify_param(const struct sctp_association *asoc, | |
1729 | union sctp_params param, | |
1730 | sctp_cid_t cid, | |
1731 | struct sctp_chunk *chunk, | |
1732 | struct sctp_chunk **err_chunk) | |
1733 | { | |
1734 | int retval = 1; | |
1735 | ||
1736 | /* FIXME - This routine is not looking at each parameter per the | |
1737 | * chunk type, i.e., unrecognized parameters should be further | |
1738 | * identified based on the chunk id. | |
1739 | */ | |
1740 | ||
1741 | switch (param.p->type) { | |
1742 | case SCTP_PARAM_IPV4_ADDRESS: | |
1743 | case SCTP_PARAM_IPV6_ADDRESS: | |
1744 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
1745 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
1746 | case SCTP_PARAM_STATE_COOKIE: | |
1747 | case SCTP_PARAM_HEARTBEAT_INFO: | |
1748 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
1749 | case SCTP_PARAM_ECN_CAPABLE: | |
1750 | case SCTP_PARAM_ADAPTION_LAYER_IND: | |
1751 | break; | |
1752 | ||
1753 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
1754 | /* Tell the peer, we won't support this param. */ | |
1755 | return sctp_process_hn_param(asoc, param, chunk, err_chunk); | |
1756 | case SCTP_PARAM_FWD_TSN_SUPPORT: | |
1757 | if (sctp_prsctp_enable) | |
1758 | break; | |
1759 | /* Fall Through */ | |
1760 | default: | |
1761 | SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", | |
1762 | ntohs(param.p->type), cid); | |
1763 | return sctp_process_unk_param(asoc, param, chunk, err_chunk); | |
1764 | ||
1765 | break; | |
1766 | } | |
1767 | return retval; | |
1768 | } | |
1769 | ||
1770 | /* Verify the INIT packet before we process it. */ | |
1771 | int sctp_verify_init(const struct sctp_association *asoc, | |
1772 | sctp_cid_t cid, | |
1773 | sctp_init_chunk_t *peer_init, | |
1774 | struct sctp_chunk *chunk, | |
1775 | struct sctp_chunk **errp) | |
1776 | { | |
1777 | union sctp_params param; | |
1778 | int has_cookie = 0; | |
1779 | ||
1780 | /* Verify stream values are non-zero. */ | |
1781 | if ((0 == peer_init->init_hdr.num_outbound_streams) || | |
1782 | (0 == peer_init->init_hdr.num_inbound_streams)) { | |
1783 | ||
1784 | sctp_process_inv_mandatory(asoc, chunk, errp); | |
1785 | return 0; | |
1786 | } | |
1787 | ||
1788 | /* Check for missing mandatory parameters. */ | |
1789 | sctp_walk_params(param, peer_init, init_hdr.params) { | |
1790 | ||
1791 | if (SCTP_PARAM_STATE_COOKIE == param.p->type) | |
1792 | has_cookie = 1; | |
1793 | ||
1794 | } /* for (loop through all parameters) */ | |
1795 | ||
1796 | /* There is a possibility that a parameter length was bad and | |
1797 | * in that case we would have stoped walking the parameters. | |
1798 | * The current param.p would point at the bad one. | |
1799 | * Current consensus on the mailing list is to generate a PROTOCOL | |
1800 | * VIOLATION error. We build the ERROR chunk here and let the normal | |
1801 | * error handling code build and send the packet. | |
1802 | */ | |
1803 | if (param.v < (void*)chunk->chunk_end - sizeof(sctp_paramhdr_t)) { | |
1804 | sctp_process_inv_paramlength(asoc, param.p, chunk, errp); | |
1805 | return 0; | |
1806 | } | |
1807 | ||
1808 | /* The only missing mandatory param possible today is | |
1809 | * the state cookie for an INIT-ACK chunk. | |
1810 | */ | |
1811 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) { | |
1812 | sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, | |
1813 | chunk, errp); | |
1814 | return 0; | |
1815 | } | |
1816 | ||
1817 | /* Find unrecognized parameters. */ | |
1818 | ||
1819 | sctp_walk_params(param, peer_init, init_hdr.params) { | |
1820 | ||
1821 | if (!sctp_verify_param(asoc, param, cid, chunk, errp)) { | |
1822 | if (SCTP_PARAM_HOST_NAME_ADDRESS == param.p->type) | |
1823 | return 0; | |
1824 | else | |
1825 | return 1; | |
1826 | } | |
1827 | ||
1828 | } /* for (loop through all parameters) */ | |
1829 | ||
1830 | return 1; | |
1831 | } | |
1832 | ||
1833 | /* Unpack the parameters in an INIT packet into an association. | |
1834 | * Returns 0 on failure, else success. | |
1835 | * FIXME: This is an association method. | |
1836 | */ | |
1837 | int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, | |
1838 | const union sctp_addr *peer_addr, | |
dd0fc66f | 1839 | sctp_init_chunk_t *peer_init, gfp_t gfp) |
1da177e4 LT |
1840 | { |
1841 | union sctp_params param; | |
1842 | struct sctp_transport *transport; | |
1843 | struct list_head *pos, *temp; | |
1844 | char *cookie; | |
1845 | ||
1846 | /* We must include the address that the INIT packet came from. | |
1847 | * This is the only address that matters for an INIT packet. | |
1848 | * When processing a COOKIE ECHO, we retrieve the from address | |
1849 | * of the INIT from the cookie. | |
1850 | */ | |
1851 | ||
1852 | /* This implementation defaults to making the first transport | |
1853 | * added as the primary transport. The source address seems to | |
1854 | * be a a better choice than any of the embedded addresses. | |
1855 | */ | |
1856 | if (peer_addr) | |
3f7a87d2 | 1857 | if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) |
1da177e4 LT |
1858 | goto nomem; |
1859 | ||
1860 | /* Process the initialization parameters. */ | |
1861 | ||
1862 | sctp_walk_params(param, peer_init, init_hdr.params) { | |
1863 | ||
1864 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) | |
1865 | goto clean_up; | |
1866 | } | |
1867 | ||
3f7a87d2 FF |
1868 | /* Walk list of transports, removing transports in the UNKNOWN state. */ |
1869 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1870 | transport = list_entry(pos, struct sctp_transport, transports); | |
1871 | if (transport->state == SCTP_UNKNOWN) { | |
1872 | sctp_assoc_rm_peer(asoc, transport); | |
1873 | } | |
1874 | } | |
1875 | ||
1da177e4 LT |
1876 | /* The fixed INIT headers are always in network byte |
1877 | * order. | |
1878 | */ | |
1879 | asoc->peer.i.init_tag = | |
1880 | ntohl(peer_init->init_hdr.init_tag); | |
1881 | asoc->peer.i.a_rwnd = | |
1882 | ntohl(peer_init->init_hdr.a_rwnd); | |
1883 | asoc->peer.i.num_outbound_streams = | |
1884 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
1885 | asoc->peer.i.num_inbound_streams = | |
1886 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
1887 | asoc->peer.i.initial_tsn = | |
1888 | ntohl(peer_init->init_hdr.initial_tsn); | |
1889 | ||
1890 | /* Apply the upper bounds for output streams based on peer's | |
1891 | * number of inbound streams. | |
1892 | */ | |
1893 | if (asoc->c.sinit_num_ostreams > | |
1894 | ntohs(peer_init->init_hdr.num_inbound_streams)) { | |
1895 | asoc->c.sinit_num_ostreams = | |
1896 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
1897 | } | |
1898 | ||
1899 | if (asoc->c.sinit_max_instreams > | |
1900 | ntohs(peer_init->init_hdr.num_outbound_streams)) { | |
1901 | asoc->c.sinit_max_instreams = | |
1902 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
1903 | } | |
1904 | ||
1905 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ | |
1906 | asoc->c.peer_vtag = asoc->peer.i.init_tag; | |
1907 | ||
1908 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ | |
1909 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; | |
1910 | ||
1911 | /* Copy cookie in case we need to resend COOKIE-ECHO. */ | |
1912 | cookie = asoc->peer.cookie; | |
1913 | if (cookie) { | |
1914 | asoc->peer.cookie = kmalloc(asoc->peer.cookie_len, gfp); | |
1915 | if (!asoc->peer.cookie) | |
1916 | goto clean_up; | |
1917 | memcpy(asoc->peer.cookie, cookie, asoc->peer.cookie_len); | |
1918 | } | |
1919 | ||
1920 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily | |
1921 | * high (for example, implementations MAY use the size of the receiver | |
1922 | * advertised window). | |
1923 | */ | |
1924 | list_for_each(pos, &asoc->peer.transport_addr_list) { | |
1925 | transport = list_entry(pos, struct sctp_transport, transports); | |
1926 | transport->ssthresh = asoc->peer.i.a_rwnd; | |
1927 | } | |
1928 | ||
1929 | /* Set up the TSN tracking pieces. */ | |
1930 | sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, | |
1931 | asoc->peer.i.initial_tsn); | |
1932 | ||
1933 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
1934 | * | |
1935 | * The stream sequence number in all the streams shall start | |
1936 | * from 0 when the association is established. Also, when the | |
1937 | * stream sequence number reaches the value 65535 the next | |
1938 | * stream sequence number shall be set to 0. | |
1939 | */ | |
1940 | ||
3f7a87d2 FF |
1941 | /* Allocate storage for the negotiated streams if it is not a temporary |
1942 | * association. | |
1da177e4 LT |
1943 | */ |
1944 | if (!asoc->temp) { | |
1945 | int assoc_id; | |
1946 | int error; | |
1947 | ||
1948 | asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, | |
1949 | asoc->c.sinit_num_ostreams, gfp); | |
1950 | if (!asoc->ssnmap) | |
1951 | goto clean_up; | |
1952 | ||
1953 | retry: | |
1954 | if (unlikely(!idr_pre_get(&sctp_assocs_id, gfp))) | |
1955 | goto clean_up; | |
1956 | spin_lock_bh(&sctp_assocs_id_lock); | |
1957 | error = idr_get_new_above(&sctp_assocs_id, (void *)asoc, 1, | |
1958 | &assoc_id); | |
1959 | spin_unlock_bh(&sctp_assocs_id_lock); | |
1960 | if (error == -EAGAIN) | |
1961 | goto retry; | |
1962 | else if (error) | |
1963 | goto clean_up; | |
1964 | ||
1965 | asoc->assoc_id = (sctp_assoc_t) assoc_id; | |
1966 | } | |
1967 | ||
1968 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
1969 | * | |
1970 | * When an endpoint has an ASCONF signaled change to be sent to the | |
1971 | * remote endpoint it should do the following: | |
1972 | * ... | |
1973 | * A2) A serial number should be assigned to the Chunk. The serial | |
1974 | * number should be a monotonically increasing number. All serial | |
1975 | * numbers are defined to be initialized at the start of the | |
1976 | * association to the same value as the Initial TSN. | |
1977 | */ | |
1978 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; | |
1979 | return 1; | |
1980 | ||
1981 | clean_up: | |
1982 | /* Release the transport structures. */ | |
1983 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1984 | transport = list_entry(pos, struct sctp_transport, transports); | |
1985 | list_del_init(pos); | |
1986 | sctp_transport_free(transport); | |
1987 | } | |
3f7a87d2 FF |
1988 | |
1989 | asoc->peer.transport_count = 0; | |
1990 | ||
1da177e4 LT |
1991 | nomem: |
1992 | return 0; | |
1993 | } | |
1994 | ||
1995 | ||
1996 | /* Update asoc with the option described in param. | |
1997 | * | |
1998 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT | |
1999 | * | |
2000 | * asoc is the association to update. | |
2001 | * param is the variable length parameter to use for update. | |
2002 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. | |
2003 | * If the current packet is an INIT we want to minimize the amount of | |
2004 | * work we do. In particular, we should not build transport | |
2005 | * structures for the addresses. | |
2006 | */ | |
2007 | static int sctp_process_param(struct sctp_association *asoc, | |
2008 | union sctp_params param, | |
2009 | const union sctp_addr *peer_addr, | |
dd0fc66f | 2010 | gfp_t gfp) |
1da177e4 LT |
2011 | { |
2012 | union sctp_addr addr; | |
2013 | int i; | |
2014 | __u16 sat; | |
2015 | int retval = 1; | |
2016 | sctp_scope_t scope; | |
2017 | time_t stale; | |
2018 | struct sctp_af *af; | |
2019 | ||
2020 | /* We maintain all INIT parameters in network byte order all the | |
2021 | * time. This allows us to not worry about whether the parameters | |
2022 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. | |
2023 | */ | |
2024 | switch (param.p->type) { | |
2025 | case SCTP_PARAM_IPV6_ADDRESS: | |
2026 | if (PF_INET6 != asoc->base.sk->sk_family) | |
2027 | break; | |
2028 | /* Fall through. */ | |
2029 | case SCTP_PARAM_IPV4_ADDRESS: | |
2030 | af = sctp_get_af_specific(param_type2af(param.p->type)); | |
2031 | af->from_addr_param(&addr, param.addr, asoc->peer.port, 0); | |
2032 | scope = sctp_scope(peer_addr); | |
2033 | if (sctp_in_scope(&addr, scope)) | |
ad8fec17 | 2034 | if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) |
1da177e4 LT |
2035 | return 0; |
2036 | break; | |
2037 | ||
2038 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
2039 | if (!sctp_cookie_preserve_enable) | |
2040 | break; | |
2041 | ||
2042 | stale = ntohl(param.life->lifespan_increment); | |
2043 | ||
2044 | /* Suggested Cookie Life span increment's unit is msec, | |
2045 | * (1/1000sec). | |
2046 | */ | |
2047 | asoc->cookie_life.tv_sec += stale / 1000; | |
2048 | asoc->cookie_life.tv_usec += (stale % 1000) * 1000; | |
2049 | break; | |
2050 | ||
2051 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2052 | SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); | |
2053 | break; | |
2054 | ||
2055 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2056 | /* Turn off the default values first so we'll know which | |
2057 | * ones are really set by the peer. | |
2058 | */ | |
2059 | asoc->peer.ipv4_address = 0; | |
2060 | asoc->peer.ipv6_address = 0; | |
2061 | ||
2062 | /* Cycle through address types; avoid divide by 0. */ | |
2063 | sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
2064 | if (sat) | |
2065 | sat /= sizeof(__u16); | |
2066 | ||
2067 | for (i = 0; i < sat; ++i) { | |
2068 | switch (param.sat->types[i]) { | |
2069 | case SCTP_PARAM_IPV4_ADDRESS: | |
2070 | asoc->peer.ipv4_address = 1; | |
2071 | break; | |
2072 | ||
2073 | case SCTP_PARAM_IPV6_ADDRESS: | |
2074 | asoc->peer.ipv6_address = 1; | |
2075 | break; | |
2076 | ||
2077 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2078 | asoc->peer.hostname_address = 1; | |
2079 | break; | |
2080 | ||
2081 | default: /* Just ignore anything else. */ | |
2082 | break; | |
2083 | }; | |
2084 | } | |
2085 | break; | |
2086 | ||
2087 | case SCTP_PARAM_STATE_COOKIE: | |
2088 | asoc->peer.cookie_len = | |
2089 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
2090 | asoc->peer.cookie = param.cookie->body; | |
2091 | break; | |
2092 | ||
2093 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2094 | /* Would be odd to receive, but it causes no problems. */ | |
2095 | break; | |
2096 | ||
2097 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2098 | /* Rejected during verify stage. */ | |
2099 | break; | |
2100 | ||
2101 | case SCTP_PARAM_ECN_CAPABLE: | |
2102 | asoc->peer.ecn_capable = 1; | |
2103 | break; | |
2104 | ||
2105 | case SCTP_PARAM_ADAPTION_LAYER_IND: | |
2106 | asoc->peer.adaption_ind = param.aind->adaption_ind; | |
2107 | break; | |
2108 | ||
2109 | case SCTP_PARAM_FWD_TSN_SUPPORT: | |
2110 | if (sctp_prsctp_enable) { | |
2111 | asoc->peer.prsctp_capable = 1; | |
2112 | break; | |
2113 | } | |
2114 | /* Fall Through */ | |
2115 | default: | |
2116 | /* Any unrecognized parameters should have been caught | |
2117 | * and handled by sctp_verify_param() which should be | |
2118 | * called prior to this routine. Simply log the error | |
2119 | * here. | |
2120 | */ | |
2121 | SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", | |
2122 | ntohs(param.p->type), asoc); | |
2123 | break; | |
2124 | }; | |
2125 | ||
2126 | return retval; | |
2127 | } | |
2128 | ||
2129 | /* Select a new verification tag. */ | |
2130 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) | |
2131 | { | |
2132 | /* I believe that this random number generator complies with RFC1750. | |
2133 | * A tag of 0 is reserved for special cases (e.g. INIT). | |
2134 | */ | |
2135 | __u32 x; | |
2136 | ||
2137 | do { | |
2138 | get_random_bytes(&x, sizeof(__u32)); | |
2139 | } while (x == 0); | |
2140 | ||
2141 | return x; | |
2142 | } | |
2143 | ||
2144 | /* Select an initial TSN to send during startup. */ | |
2145 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) | |
2146 | { | |
2147 | __u32 retval; | |
2148 | ||
2149 | get_random_bytes(&retval, sizeof(__u32)); | |
2150 | return retval; | |
2151 | } | |
2152 | ||
2153 | /* | |
2154 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) | |
2155 | * 0 1 2 3 | |
2156 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2157 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2158 | * | Type = 0xC1 | Chunk Flags | Chunk Length | | |
2159 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2160 | * | Serial Number | | |
2161 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2162 | * | Address Parameter | | |
2163 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2164 | * | ASCONF Parameter #1 | | |
2165 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2166 | * \ \ | |
2167 | * / .... / | |
2168 | * \ \ | |
2169 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2170 | * | ASCONF Parameter #N | | |
2171 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2172 | * | |
2173 | * Address Parameter and other parameter will not be wrapped in this function | |
2174 | */ | |
2175 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, | |
2176 | union sctp_addr *addr, | |
2177 | int vparam_len) | |
2178 | { | |
2179 | sctp_addiphdr_t asconf; | |
2180 | struct sctp_chunk *retval; | |
2181 | int length = sizeof(asconf) + vparam_len; | |
2182 | union sctp_addr_param addrparam; | |
2183 | int addrlen; | |
2184 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2185 | ||
2186 | addrlen = af->to_addr_param(addr, &addrparam); | |
2187 | if (!addrlen) | |
2188 | return NULL; | |
2189 | length += addrlen; | |
2190 | ||
2191 | /* Create the chunk. */ | |
2192 | retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); | |
2193 | if (!retval) | |
2194 | return NULL; | |
2195 | ||
2196 | asconf.serial = htonl(asoc->addip_serial++); | |
2197 | ||
2198 | retval->subh.addip_hdr = | |
2199 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2200 | retval->param_hdr.v = | |
2201 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2202 | ||
2203 | return retval; | |
2204 | } | |
2205 | ||
2206 | /* ADDIP | |
2207 | * 3.2.1 Add IP Address | |
2208 | * 0 1 2 3 | |
2209 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2210 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2211 | * | Type = 0xC001 | Length = Variable | | |
2212 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2213 | * | ASCONF-Request Correlation ID | | |
2214 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2215 | * | Address Parameter | | |
2216 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2217 | * | |
2218 | * 3.2.2 Delete IP Address | |
2219 | * 0 1 2 3 | |
2220 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2221 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2222 | * | Type = 0xC002 | Length = Variable | | |
2223 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2224 | * | ASCONF-Request Correlation ID | | |
2225 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2226 | * | Address Parameter | | |
2227 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2228 | * | |
2229 | */ | |
2230 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, | |
2231 | union sctp_addr *laddr, | |
2232 | struct sockaddr *addrs, | |
2233 | int addrcnt, | |
dbc16db1 | 2234 | __be16 flags) |
1da177e4 LT |
2235 | { |
2236 | sctp_addip_param_t param; | |
2237 | struct sctp_chunk *retval; | |
2238 | union sctp_addr_param addr_param; | |
2239 | union sctp_addr *addr; | |
2240 | void *addr_buf; | |
2241 | struct sctp_af *af; | |
2242 | int paramlen = sizeof(param); | |
2243 | int addr_param_len = 0; | |
2244 | int totallen = 0; | |
2245 | int i; | |
2246 | ||
2247 | /* Get total length of all the address parameters. */ | |
2248 | addr_buf = addrs; | |
2249 | for (i = 0; i < addrcnt; i++) { | |
2250 | addr = (union sctp_addr *)addr_buf; | |
2251 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2252 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2253 | ||
2254 | totallen += paramlen; | |
2255 | totallen += addr_param_len; | |
2256 | ||
2257 | addr_buf += af->sockaddr_len; | |
2258 | } | |
2259 | ||
2260 | /* Create an asconf chunk with the required length. */ | |
2261 | retval = sctp_make_asconf(asoc, laddr, totallen); | |
2262 | if (!retval) | |
2263 | return NULL; | |
2264 | ||
2265 | /* Add the address parameters to the asconf chunk. */ | |
2266 | addr_buf = addrs; | |
2267 | for (i = 0; i < addrcnt; i++) { | |
2268 | addr = (union sctp_addr *)addr_buf; | |
2269 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2270 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2271 | param.param_hdr.type = flags; | |
2272 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
2273 | param.crr_id = i; | |
2274 | ||
2275 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2276 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2277 | ||
2278 | addr_buf += af->sockaddr_len; | |
2279 | } | |
2280 | return retval; | |
2281 | } | |
2282 | ||
2283 | /* ADDIP | |
2284 | * 3.2.4 Set Primary IP Address | |
2285 | * 0 1 2 3 | |
2286 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2287 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2288 | * | Type =0xC004 | Length = Variable | | |
2289 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2290 | * | ASCONF-Request Correlation ID | | |
2291 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2292 | * | Address Parameter | | |
2293 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2294 | * | |
2295 | * Create an ASCONF chunk with Set Primary IP address parameter. | |
2296 | */ | |
2297 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, | |
2298 | union sctp_addr *addr) | |
2299 | { | |
2300 | sctp_addip_param_t param; | |
2301 | struct sctp_chunk *retval; | |
2302 | int len = sizeof(param); | |
2303 | union sctp_addr_param addrparam; | |
2304 | int addrlen; | |
2305 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2306 | ||
2307 | addrlen = af->to_addr_param(addr, &addrparam); | |
2308 | if (!addrlen) | |
2309 | return NULL; | |
2310 | len += addrlen; | |
2311 | ||
2312 | /* Create the chunk and make asconf header. */ | |
2313 | retval = sctp_make_asconf(asoc, addr, len); | |
2314 | if (!retval) | |
2315 | return NULL; | |
2316 | ||
2317 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; | |
2318 | param.param_hdr.length = htons(len); | |
2319 | param.crr_id = 0; | |
2320 | ||
2321 | sctp_addto_chunk(retval, sizeof(param), ¶m); | |
2322 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2323 | ||
2324 | return retval; | |
2325 | } | |
2326 | ||
2327 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) | |
2328 | * 0 1 2 3 | |
2329 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2330 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2331 | * | Type = 0x80 | Chunk Flags | Chunk Length | | |
2332 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2333 | * | Serial Number | | |
2334 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2335 | * | ASCONF Parameter Response#1 | | |
2336 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2337 | * \ \ | |
2338 | * / .... / | |
2339 | * \ \ | |
2340 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2341 | * | ASCONF Parameter Response#N | | |
2342 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2343 | * | |
2344 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. | |
2345 | */ | |
2346 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, | |
2347 | __u32 serial, int vparam_len) | |
2348 | { | |
2349 | sctp_addiphdr_t asconf; | |
2350 | struct sctp_chunk *retval; | |
2351 | int length = sizeof(asconf) + vparam_len; | |
2352 | ||
2353 | /* Create the chunk. */ | |
2354 | retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); | |
2355 | if (!retval) | |
2356 | return NULL; | |
2357 | ||
2358 | asconf.serial = htonl(serial); | |
2359 | ||
2360 | retval->subh.addip_hdr = | |
2361 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2362 | ||
2363 | return retval; | |
2364 | } | |
2365 | ||
2366 | /* Add response parameters to an ASCONF_ACK chunk. */ | |
2367 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __u32 crr_id, | |
dbc16db1 | 2368 | __be16 err_code, sctp_addip_param_t *asconf_param) |
1da177e4 LT |
2369 | { |
2370 | sctp_addip_param_t ack_param; | |
2371 | sctp_errhdr_t err_param; | |
2372 | int asconf_param_len = 0; | |
2373 | int err_param_len = 0; | |
dbc16db1 | 2374 | __be16 response_type; |
1da177e4 LT |
2375 | |
2376 | if (SCTP_ERROR_NO_ERROR == err_code) { | |
2377 | response_type = SCTP_PARAM_SUCCESS_REPORT; | |
2378 | } else { | |
2379 | response_type = SCTP_PARAM_ERR_CAUSE; | |
2380 | err_param_len = sizeof(err_param); | |
2381 | if (asconf_param) | |
2382 | asconf_param_len = | |
2383 | ntohs(asconf_param->param_hdr.length); | |
2384 | } | |
2385 | ||
2386 | /* Add Success Indication or Error Cause Indication parameter. */ | |
2387 | ack_param.param_hdr.type = response_type; | |
2388 | ack_param.param_hdr.length = htons(sizeof(ack_param) + | |
2389 | err_param_len + | |
2390 | asconf_param_len); | |
2391 | ack_param.crr_id = crr_id; | |
2392 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); | |
2393 | ||
2394 | if (SCTP_ERROR_NO_ERROR == err_code) | |
2395 | return; | |
2396 | ||
2397 | /* Add Error Cause parameter. */ | |
2398 | err_param.cause = err_code; | |
2399 | err_param.length = htons(err_param_len + asconf_param_len); | |
2400 | sctp_addto_chunk(chunk, err_param_len, &err_param); | |
2401 | ||
2402 | /* Add the failed TLV copied from ASCONF chunk. */ | |
2403 | if (asconf_param) | |
2404 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); | |
2405 | } | |
2406 | ||
2407 | /* Process a asconf parameter. */ | |
dbc16db1 | 2408 | static __be16 sctp_process_asconf_param(struct sctp_association *asoc, |
1da177e4 LT |
2409 | struct sctp_chunk *asconf, |
2410 | sctp_addip_param_t *asconf_param) | |
2411 | { | |
2412 | struct sctp_transport *peer; | |
2413 | struct sctp_af *af; | |
2414 | union sctp_addr addr; | |
2415 | struct list_head *pos; | |
2416 | union sctp_addr_param *addr_param; | |
5f242a13 AV |
2417 | union sctp_addr tmp, tmp_addr; |
2418 | ||
1da177e4 LT |
2419 | addr_param = (union sctp_addr_param *) |
2420 | ((void *)asconf_param + sizeof(sctp_addip_param_t)); | |
2421 | ||
2422 | af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); | |
2423 | if (unlikely(!af)) | |
2424 | return SCTP_ERROR_INV_PARAM; | |
2425 | ||
2426 | af->from_addr_param(&addr, addr_param, asoc->peer.port, 0); | |
5f242a13 | 2427 | flip_to_n(&tmp_addr, &addr); |
1da177e4 LT |
2428 | switch (asconf_param->param_hdr.type) { |
2429 | case SCTP_PARAM_ADD_IP: | |
2430 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address | |
2431 | * request and does not have the local resources to add this | |
2432 | * new address to the association, it MUST return an Error | |
2433 | * Cause TLV set to the new error code 'Operation Refused | |
2434 | * Due to Resource Shortage'. | |
2435 | */ | |
2436 | ||
ad8fec17 | 2437 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); |
1da177e4 LT |
2438 | if (!peer) |
2439 | return SCTP_ERROR_RSRC_LOW; | |
2440 | ||
2441 | /* Start the heartbeat timer. */ | |
2442 | if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) | |
2443 | sctp_transport_hold(peer); | |
2444 | break; | |
2445 | case SCTP_PARAM_DEL_IP: | |
2446 | /* ADDIP 4.3 D7) If a request is received to delete the | |
2447 | * last remaining IP address of a peer endpoint, the receiver | |
2448 | * MUST send an Error Cause TLV with the error cause set to the | |
2449 | * new error code 'Request to Delete Last Remaining IP Address'. | |
2450 | */ | |
2451 | pos = asoc->peer.transport_addr_list.next; | |
2452 | if (pos->next == &asoc->peer.transport_addr_list) | |
2453 | return SCTP_ERROR_DEL_LAST_IP; | |
2454 | ||
2455 | /* ADDIP 4.3 D8) If a request is received to delete an IP | |
2456 | * address which is also the source address of the IP packet | |
2457 | * which contained the ASCONF chunk, the receiver MUST reject | |
2458 | * this request. To reject the request the receiver MUST send | |
2459 | * an Error Cause TLV set to the new error code 'Request to | |
2460 | * Delete Source IP Address' | |
2461 | */ | |
5f242a13 AV |
2462 | flip_to_n(&tmp, sctp_source(asconf)); |
2463 | if (sctp_cmp_addr_exact(&tmp, &tmp_addr)) | |
1da177e4 LT |
2464 | return SCTP_ERROR_DEL_SRC_IP; |
2465 | ||
38a03145 | 2466 | sctp_assoc_del_peer(asoc, &tmp_addr); |
1da177e4 LT |
2467 | break; |
2468 | case SCTP_PARAM_SET_PRIMARY: | |
be29681e | 2469 | peer = sctp_assoc_lookup_paddr(asoc, &tmp_addr); |
1da177e4 LT |
2470 | if (!peer) |
2471 | return SCTP_ERROR_INV_PARAM; | |
2472 | ||
2473 | sctp_assoc_set_primary(asoc, peer); | |
2474 | break; | |
2475 | default: | |
2476 | return SCTP_ERROR_INV_PARAM; | |
2477 | break; | |
2478 | } | |
2479 | ||
2480 | return SCTP_ERROR_NO_ERROR; | |
2481 | } | |
2482 | ||
2483 | /* Process an incoming ASCONF chunk with the next expected serial no. and | |
2484 | * return an ASCONF_ACK chunk to be sent in response. | |
2485 | */ | |
2486 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, | |
2487 | struct sctp_chunk *asconf) | |
2488 | { | |
2489 | sctp_addiphdr_t *hdr; | |
2490 | union sctp_addr_param *addr_param; | |
2491 | sctp_addip_param_t *asconf_param; | |
2492 | struct sctp_chunk *asconf_ack; | |
2493 | ||
dbc16db1 | 2494 | __be16 err_code; |
1da177e4 LT |
2495 | int length = 0; |
2496 | int chunk_len = asconf->skb->len; | |
2497 | __u32 serial; | |
2498 | int all_param_pass = 1; | |
2499 | ||
2500 | hdr = (sctp_addiphdr_t *)asconf->skb->data; | |
2501 | serial = ntohl(hdr->serial); | |
2502 | ||
2503 | /* Skip the addiphdr and store a pointer to address parameter. */ | |
2504 | length = sizeof(sctp_addiphdr_t); | |
2505 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); | |
2506 | chunk_len -= length; | |
2507 | ||
2508 | /* Skip the address parameter and store a pointer to the first | |
2509 | * asconf paramter. | |
2510 | */ | |
2511 | length = ntohs(addr_param->v4.param_hdr.length); | |
2512 | asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); | |
2513 | chunk_len -= length; | |
2514 | ||
2515 | /* create an ASCONF_ACK chunk. | |
2516 | * Based on the definitions of parameters, we know that the size of | |
2517 | * ASCONF_ACK parameters are less than or equal to the twice of ASCONF | |
2518 | * paramters. | |
2519 | */ | |
2520 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2); | |
2521 | if (!asconf_ack) | |
2522 | goto done; | |
2523 | ||
2524 | /* Process the TLVs contained within the ASCONF chunk. */ | |
2525 | while (chunk_len > 0) { | |
2526 | err_code = sctp_process_asconf_param(asoc, asconf, | |
2527 | asconf_param); | |
2528 | /* ADDIP 4.1 A7) | |
2529 | * If an error response is received for a TLV parameter, | |
2530 | * all TLVs with no response before the failed TLV are | |
2531 | * considered successful if not reported. All TLVs after | |
2532 | * the failed response are considered unsuccessful unless | |
2533 | * a specific success indication is present for the parameter. | |
2534 | */ | |
2535 | if (SCTP_ERROR_NO_ERROR != err_code) | |
2536 | all_param_pass = 0; | |
2537 | ||
2538 | if (!all_param_pass) | |
2539 | sctp_add_asconf_response(asconf_ack, | |
2540 | asconf_param->crr_id, err_code, | |
2541 | asconf_param); | |
2542 | ||
2543 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add | |
2544 | * an IP address sends an 'Out of Resource' in its response, it | |
2545 | * MUST also fail any subsequent add or delete requests bundled | |
2546 | * in the ASCONF. | |
2547 | */ | |
2548 | if (SCTP_ERROR_RSRC_LOW == err_code) | |
2549 | goto done; | |
2550 | ||
2551 | /* Move to the next ASCONF param. */ | |
2552 | length = ntohs(asconf_param->param_hdr.length); | |
2553 | asconf_param = (sctp_addip_param_t *)((void *)asconf_param + | |
2554 | length); | |
2555 | chunk_len -= length; | |
2556 | } | |
2557 | ||
2558 | done: | |
2559 | asoc->peer.addip_serial++; | |
2560 | ||
2561 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc | |
2562 | * after freeing the reference to old asconf ack if any. | |
2563 | */ | |
2564 | if (asconf_ack) { | |
2565 | if (asoc->addip_last_asconf_ack) | |
2566 | sctp_chunk_free(asoc->addip_last_asconf_ack); | |
2567 | ||
2568 | sctp_chunk_hold(asconf_ack); | |
2569 | asoc->addip_last_asconf_ack = asconf_ack; | |
2570 | } | |
2571 | ||
2572 | return asconf_ack; | |
2573 | } | |
2574 | ||
2575 | /* Process a asconf parameter that is successfully acked. */ | |
2576 | static int sctp_asconf_param_success(struct sctp_association *asoc, | |
2577 | sctp_addip_param_t *asconf_param) | |
2578 | { | |
2579 | struct sctp_af *af; | |
2580 | union sctp_addr addr; | |
2581 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; | |
2582 | union sctp_addr_param *addr_param; | |
2583 | struct list_head *pos; | |
2584 | struct sctp_transport *transport; | |
dc022a98 | 2585 | struct sctp_sockaddr_entry *saddr; |
1da177e4 | 2586 | int retval = 0; |
5f242a13 | 2587 | union sctp_addr tmp; |
1da177e4 LT |
2588 | |
2589 | addr_param = (union sctp_addr_param *) | |
2590 | ((void *)asconf_param + sizeof(sctp_addip_param_t)); | |
2591 | ||
2592 | /* We have checked the packet before, so we do not check again. */ | |
2593 | af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); | |
2594 | af->from_addr_param(&addr, addr_param, bp->port, 0); | |
5f242a13 | 2595 | flip_to_n(&tmp, &addr); |
1da177e4 LT |
2596 | |
2597 | switch (asconf_param->param_hdr.type) { | |
2598 | case SCTP_PARAM_ADD_IP: | |
2599 | sctp_local_bh_disable(); | |
2600 | sctp_write_lock(&asoc->base.addr_lock); | |
dc022a98 SS |
2601 | list_for_each(pos, &bp->address_list) { |
2602 | saddr = list_entry(pos, struct sctp_sockaddr_entry, list); | |
5f242a13 | 2603 | if (sctp_cmp_addr_exact(&saddr->a, &tmp)) |
dc022a98 SS |
2604 | saddr->use_as_src = 1; |
2605 | } | |
1da177e4 LT |
2606 | sctp_write_unlock(&asoc->base.addr_lock); |
2607 | sctp_local_bh_enable(); | |
2608 | break; | |
2609 | case SCTP_PARAM_DEL_IP: | |
2610 | sctp_local_bh_disable(); | |
2611 | sctp_write_lock(&asoc->base.addr_lock); | |
c9a08505 | 2612 | retval = sctp_del_bind_addr(bp, &tmp); |
1da177e4 LT |
2613 | sctp_write_unlock(&asoc->base.addr_lock); |
2614 | sctp_local_bh_enable(); | |
2615 | list_for_each(pos, &asoc->peer.transport_addr_list) { | |
2616 | transport = list_entry(pos, struct sctp_transport, | |
2617 | transports); | |
dc022a98 | 2618 | dst_release(transport->dst); |
1da177e4 LT |
2619 | sctp_transport_route(transport, NULL, |
2620 | sctp_sk(asoc->base.sk)); | |
2621 | } | |
2622 | break; | |
2623 | default: | |
2624 | break; | |
2625 | } | |
2626 | ||
2627 | return retval; | |
2628 | } | |
2629 | ||
2630 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk | |
2631 | * for the given asconf parameter. If there is no response for this parameter, | |
2632 | * return the error code based on the third argument 'no_err'. | |
2633 | * ADDIP 4.1 | |
2634 | * A7) If an error response is received for a TLV parameter, all TLVs with no | |
2635 | * response before the failed TLV are considered successful if not reported. | |
2636 | * All TLVs after the failed response are considered unsuccessful unless a | |
2637 | * specific success indication is present for the parameter. | |
2638 | */ | |
dbc16db1 | 2639 | static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
1da177e4 LT |
2640 | sctp_addip_param_t *asconf_param, |
2641 | int no_err) | |
2642 | { | |
2643 | sctp_addip_param_t *asconf_ack_param; | |
2644 | sctp_errhdr_t *err_param; | |
2645 | int length; | |
2646 | int asconf_ack_len = asconf_ack->skb->len; | |
dbc16db1 | 2647 | __be16 err_code; |
1da177e4 LT |
2648 | |
2649 | if (no_err) | |
2650 | err_code = SCTP_ERROR_NO_ERROR; | |
2651 | else | |
2652 | err_code = SCTP_ERROR_REQ_REFUSED; | |
2653 | ||
2654 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to | |
2655 | * the first asconf_ack parameter. | |
2656 | */ | |
2657 | length = sizeof(sctp_addiphdr_t); | |
2658 | asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + | |
2659 | length); | |
2660 | asconf_ack_len -= length; | |
2661 | ||
2662 | while (asconf_ack_len > 0) { | |
2663 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { | |
2664 | switch(asconf_ack_param->param_hdr.type) { | |
2665 | case SCTP_PARAM_SUCCESS_REPORT: | |
2666 | return SCTP_ERROR_NO_ERROR; | |
2667 | case SCTP_PARAM_ERR_CAUSE: | |
2668 | length = sizeof(sctp_addip_param_t); | |
2669 | err_param = (sctp_errhdr_t *) | |
2670 | ((void *)asconf_ack_param + length); | |
2671 | asconf_ack_len -= length; | |
2672 | if (asconf_ack_len > 0) | |
2673 | return err_param->cause; | |
2674 | else | |
2675 | return SCTP_ERROR_INV_PARAM; | |
2676 | break; | |
2677 | default: | |
2678 | return SCTP_ERROR_INV_PARAM; | |
2679 | } | |
2680 | } | |
2681 | ||
2682 | length = ntohs(asconf_ack_param->param_hdr.length); | |
2683 | asconf_ack_param = (sctp_addip_param_t *) | |
2684 | ((void *)asconf_ack_param + length); | |
2685 | asconf_ack_len -= length; | |
2686 | } | |
2687 | ||
2688 | return err_code; | |
2689 | } | |
2690 | ||
2691 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ | |
2692 | int sctp_process_asconf_ack(struct sctp_association *asoc, | |
2693 | struct sctp_chunk *asconf_ack) | |
2694 | { | |
2695 | struct sctp_chunk *asconf = asoc->addip_last_asconf; | |
2696 | union sctp_addr_param *addr_param; | |
2697 | sctp_addip_param_t *asconf_param; | |
2698 | int length = 0; | |
2699 | int asconf_len = asconf->skb->len; | |
2700 | int all_param_pass = 0; | |
2701 | int no_err = 1; | |
2702 | int retval = 0; | |
dbc16db1 | 2703 | __be16 err_code = SCTP_ERROR_NO_ERROR; |
1da177e4 LT |
2704 | |
2705 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store | |
2706 | * a pointer to address parameter. | |
2707 | */ | |
2708 | length = sizeof(sctp_addip_chunk_t); | |
2709 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); | |
2710 | asconf_len -= length; | |
2711 | ||
2712 | /* Skip the address parameter in the last asconf sent and store a | |
2713 | * pointer to the first asconf paramter. | |
2714 | */ | |
2715 | length = ntohs(addr_param->v4.param_hdr.length); | |
2716 | asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); | |
2717 | asconf_len -= length; | |
2718 | ||
2719 | /* ADDIP 4.1 | |
2720 | * A8) If there is no response(s) to specific TLV parameter(s), and no | |
2721 | * failures are indicated, then all request(s) are considered | |
2722 | * successful. | |
2723 | */ | |
2724 | if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) | |
2725 | all_param_pass = 1; | |
2726 | ||
2727 | /* Process the TLVs contained in the last sent ASCONF chunk. */ | |
2728 | while (asconf_len > 0) { | |
2729 | if (all_param_pass) | |
2730 | err_code = SCTP_ERROR_NO_ERROR; | |
2731 | else { | |
2732 | err_code = sctp_get_asconf_response(asconf_ack, | |
2733 | asconf_param, | |
2734 | no_err); | |
2735 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) | |
2736 | no_err = 0; | |
2737 | } | |
2738 | ||
2739 | switch (err_code) { | |
2740 | case SCTP_ERROR_NO_ERROR: | |
2741 | retval = sctp_asconf_param_success(asoc, asconf_param); | |
2742 | break; | |
2743 | ||
2744 | case SCTP_ERROR_RSRC_LOW: | |
2745 | retval = 1; | |
2746 | break; | |
2747 | ||
2748 | case SCTP_ERROR_INV_PARAM: | |
2749 | /* Disable sending this type of asconf parameter in | |
2750 | * future. | |
2751 | */ | |
2752 | asoc->peer.addip_disabled_mask |= | |
2753 | asconf_param->param_hdr.type; | |
2754 | break; | |
2755 | ||
2756 | case SCTP_ERROR_REQ_REFUSED: | |
2757 | case SCTP_ERROR_DEL_LAST_IP: | |
2758 | case SCTP_ERROR_DEL_SRC_IP: | |
2759 | default: | |
2760 | break; | |
2761 | } | |
2762 | ||
2763 | /* Skip the processed asconf parameter and move to the next | |
2764 | * one. | |
2765 | */ | |
2766 | length = ntohs(asconf_param->param_hdr.length); | |
2767 | asconf_param = (sctp_addip_param_t *)((void *)asconf_param + | |
2768 | length); | |
2769 | asconf_len -= length; | |
2770 | } | |
2771 | ||
2772 | /* Free the cached last sent asconf chunk. */ | |
2773 | sctp_chunk_free(asconf); | |
2774 | asoc->addip_last_asconf = NULL; | |
2775 | ||
2776 | /* Send the next asconf chunk from the addip chunk queue. */ | |
79af02c2 DM |
2777 | if (!list_empty(&asoc->addip_chunk_list)) { |
2778 | struct list_head *entry = asoc->addip_chunk_list.next; | |
2779 | asconf = list_entry(entry, struct sctp_chunk, list); | |
2780 | ||
2781 | list_del_init(entry); | |
2782 | ||
1da177e4 LT |
2783 | /* Hold the chunk until an ASCONF_ACK is received. */ |
2784 | sctp_chunk_hold(asconf); | |
2785 | if (sctp_primitive_ASCONF(asoc, asconf)) | |
2786 | sctp_chunk_free(asconf); | |
2787 | else | |
2788 | asoc->addip_last_asconf = asconf; | |
2789 | } | |
2790 | ||
2791 | return retval; | |
2792 | } | |
2793 | ||
2794 | /* Make a FWD TSN chunk. */ | |
2795 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, | |
2796 | __u32 new_cum_tsn, size_t nstreams, | |
2797 | struct sctp_fwdtsn_skip *skiplist) | |
2798 | { | |
2799 | struct sctp_chunk *retval = NULL; | |
2800 | struct sctp_fwdtsn_chunk *ftsn_chunk; | |
2801 | struct sctp_fwdtsn_hdr ftsn_hdr; | |
2802 | struct sctp_fwdtsn_skip skip; | |
2803 | size_t hint; | |
2804 | int i; | |
2805 | ||
2806 | hint = (nstreams + 1) * sizeof(__u32); | |
2807 | ||
1da177e4 LT |
2808 | retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); |
2809 | ||
2810 | if (!retval) | |
2811 | return NULL; | |
2812 | ||
2813 | ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr; | |
2814 | ||
2815 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); | |
2816 | retval->subh.fwdtsn_hdr = | |
2817 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
2818 | ||
2819 | for (i = 0; i < nstreams; i++) { | |
2820 | skip.stream = skiplist[i].stream; | |
2821 | skip.ssn = skiplist[i].ssn; | |
2822 | sctp_addto_chunk(retval, sizeof(skip), &skip); | |
2823 | } | |
2824 | ||
2825 | return retval; | |
2826 | } |