1 /* SCTP kernel 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.
7 * This file is part of the SCTP kernel implementation
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.
13 * This SCTP 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)
19 * This SCTP 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.
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.
30 * Please send any bug reports or fixes you make to the
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
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>
49 * Any bugs reported given to us we will try to fix... any fixes shared will
50 * be incorporated into the next SCTP release.
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <linux/types.h>
56 #include <linux/kernel.h>
58 #include <linux/ipv6.h>
59 #include <linux/net.h>
60 #include <linux/inet.h>
61 #include <linux/scatterlist.h>
62 #include <linux/crypto.h>
63 #include <linux/slab.h>
66 #include <linux/skbuff.h>
67 #include <linux/random.h> /* for get_random_bytes */
68 #include <net/sctp/sctp.h>
69 #include <net/sctp/sm.h>
72 struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
73 __u8 type, __u8 flags, int paylen);
74 static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
75 const struct sctp_association *asoc,
76 const struct sctp_chunk *init_chunk,
78 const __u8 *raw_addrs, int addrs_len);
79 static int sctp_process_param(struct sctp_association *asoc,
80 union sctp_params param,
81 const union sctp_addr *peer_addr,
83 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
86 /* What was the inbound interface for this chunk? */
87 int sctp_chunk_iif(const struct sctp_chunk *chunk)
92 af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version));
94 iif = af->skb_iif(chunk->skb);
99 /* RFC 2960 3.3.2 Initiation (INIT) (1)
101 * Note 2: The ECN capable field is reserved for future use of
102 * Explicit Congestion Notification.
104 static const struct sctp_paramhdr ecap_param = {
105 SCTP_PARAM_ECN_CAPABLE,
106 cpu_to_be16(sizeof(struct sctp_paramhdr)),
108 static const struct sctp_paramhdr prsctp_param = {
109 SCTP_PARAM_FWD_TSN_SUPPORT,
110 cpu_to_be16(sizeof(struct sctp_paramhdr)),
113 /* A helper to initialize an op error inside a
114 * provided chunk, as most cause codes will be embedded inside an
117 void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
123 /* Cause code constants are now defined in network order. */
124 err.cause = cause_code;
125 len = sizeof(sctp_errhdr_t) + paylen;
126 err.length = htons(len);
127 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
130 /* A helper to initialize an op error inside a
131 * provided chunk, as most cause codes will be embedded inside an
132 * abort chunk. Differs from sctp_init_cause in that it won't oops
133 * if there isn't enough space in the op error chunk
135 int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
141 /* Cause code constants are now defined in network order. */
142 err.cause = cause_code;
143 len = sizeof(sctp_errhdr_t) + paylen;
144 err.length = htons(len);
146 if (skb_tailroom(chunk->skb) < len)
148 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
149 sizeof(sctp_errhdr_t),
153 /* 3.3.2 Initiation (INIT) (1)
155 * This chunk is used to initiate a SCTP association between two
156 * endpoints. The format of the INIT chunk is shown below:
159 * 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
160 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
161 * | Type = 1 | Chunk Flags | Chunk Length |
162 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
164 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
165 * | Advertised Receiver Window Credit (a_rwnd) |
166 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
167 * | Number of Outbound Streams | Number of Inbound Streams |
168 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
170 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
172 * / Optional/Variable-Length Parameters /
174 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
177 * The INIT chunk contains the following parameters. Unless otherwise
178 * noted, each parameter MUST only be included once in the INIT chunk.
180 * Fixed Parameters Status
181 * ----------------------------------------------
182 * Initiate Tag Mandatory
183 * Advertised Receiver Window Credit Mandatory
184 * Number of Outbound Streams Mandatory
185 * Number of Inbound Streams Mandatory
186 * Initial TSN Mandatory
188 * Variable Parameters Status Type Value
189 * -------------------------------------------------------------
190 * IPv4 Address (Note 1) Optional 5
191 * IPv6 Address (Note 1) Optional 6
192 * Cookie Preservative Optional 9
193 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
194 * Host Name Address (Note 3) Optional 11
195 * Supported Address Types (Note 4) Optional 12
197 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
198 const struct sctp_bind_addr *bp,
199 gfp_t gfp, int vparam_len)
202 union sctp_params addrs;
204 struct sctp_chunk *retval = NULL;
205 int num_types, addrs_len = 0;
206 struct sctp_sock *sp;
207 sctp_supported_addrs_param_t sat;
209 sctp_adaptation_ind_param_t aiparam;
210 sctp_supported_ext_param_t ext_param;
213 sctp_paramhdr_t *auth_chunks = NULL,
216 /* RFC 2960 3.3.2 Initiation (INIT) (1)
218 * Note 1: The INIT chunks can contain multiple addresses that
219 * can be IPv4 and/or IPv6 in any combination.
223 /* Convert the provided bind address list to raw format. */
224 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
226 init.init_tag = htonl(asoc->c.my_vtag);
227 init.a_rwnd = htonl(asoc->rwnd);
228 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
229 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
230 init.initial_tsn = htonl(asoc->c.initial_tsn);
232 /* How many address types are needed? */
233 sp = sctp_sk(asoc->base.sk);
234 num_types = sp->pf->supported_addrs(sp, types);
236 chunksize = sizeof(init) + addrs_len;
237 chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types));
238 chunksize += sizeof(ecap_param);
240 if (sctp_prsctp_enable)
241 chunksize += sizeof(prsctp_param);
243 /* ADDIP: Section 4.2.7:
244 * An implementation supporting this extension [ADDIP] MUST list
245 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
246 * INIT-ACK parameters.
248 if (sctp_addip_enable) {
249 extensions[num_ext] = SCTP_CID_ASCONF;
250 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
254 if (sp->adaptation_ind)
255 chunksize += sizeof(aiparam);
257 chunksize += vparam_len;
259 /* Account for AUTH related parameters */
260 if (sctp_auth_enable) {
261 /* Add random parameter length*/
262 chunksize += sizeof(asoc->c.auth_random);
264 /* Add HMACS parameter length if any were defined */
265 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
266 if (auth_hmacs->length)
267 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
271 /* Add CHUNKS parameter length */
272 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
273 if (auth_chunks->length)
274 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
278 extensions[num_ext] = SCTP_CID_AUTH;
282 /* If we have any extensions to report, account for that */
284 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
287 /* RFC 2960 3.3.2 Initiation (INIT) (1)
289 * Note 3: An INIT chunk MUST NOT contain more than one Host
290 * Name address parameter. Moreover, the sender of the INIT
291 * MUST NOT combine any other address types with the Host Name
292 * address in the INIT. The receiver of INIT MUST ignore any
293 * other address types if the Host Name address parameter is
294 * present in the received INIT chunk.
296 * PLEASE DO NOT FIXME [This version does not support Host Name.]
299 retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
303 retval->subh.init_hdr =
304 sctp_addto_chunk(retval, sizeof(init), &init);
305 retval->param_hdr.v =
306 sctp_addto_chunk(retval, addrs_len, addrs.v);
308 /* RFC 2960 3.3.2 Initiation (INIT) (1)
310 * Note 4: This parameter, when present, specifies all the
311 * address types the sending endpoint can support. The absence
312 * of this parameter indicates that the sending endpoint can
313 * support any address type.
315 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
316 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
317 sctp_addto_chunk(retval, sizeof(sat), &sat);
318 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
320 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
322 /* Add the supported extensions parameter. Be nice and add this
323 * fist before addiding the parameters for the extensions themselves
326 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
327 ext_param.param_hdr.length =
328 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
329 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
331 sctp_addto_param(retval, num_ext, extensions);
334 if (sctp_prsctp_enable)
335 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
337 if (sp->adaptation_ind) {
338 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
339 aiparam.param_hdr.length = htons(sizeof(aiparam));
340 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
341 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
344 /* Add SCTP-AUTH chunks to the parameter list */
345 if (sctp_auth_enable) {
346 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
347 asoc->c.auth_random);
349 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
352 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
360 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
361 const struct sctp_chunk *chunk,
362 gfp_t gfp, int unkparam_len)
364 sctp_inithdr_t initack;
365 struct sctp_chunk *retval;
366 union sctp_params addrs;
367 struct sctp_sock *sp;
369 sctp_cookie_param_t *cookie;
372 sctp_adaptation_ind_param_t aiparam;
373 sctp_supported_ext_param_t ext_param;
376 sctp_paramhdr_t *auth_chunks = NULL,
382 /* Note: there may be no addresses to embed. */
383 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
385 initack.init_tag = htonl(asoc->c.my_vtag);
386 initack.a_rwnd = htonl(asoc->rwnd);
387 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
388 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
389 initack.initial_tsn = htonl(asoc->c.initial_tsn);
391 /* FIXME: We really ought to build the cookie right
392 * into the packet instead of allocating more fresh memory.
394 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
399 /* Calculate the total size of allocation, include the reserved
400 * space for reporting unknown parameters if it is specified.
402 sp = sctp_sk(asoc->base.sk);
403 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
405 /* Tell peer that we'll do ECN only if peer advertised such cap. */
406 if (asoc->peer.ecn_capable)
407 chunksize += sizeof(ecap_param);
409 if (asoc->peer.prsctp_capable)
410 chunksize += sizeof(prsctp_param);
412 if (asoc->peer.asconf_capable) {
413 extensions[num_ext] = SCTP_CID_ASCONF;
414 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
418 if (sp->adaptation_ind)
419 chunksize += sizeof(aiparam);
421 if (asoc->peer.auth_capable) {
422 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
423 chunksize += ntohs(auth_random->length);
425 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
426 if (auth_hmacs->length)
427 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
431 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
432 if (auth_chunks->length)
433 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
437 extensions[num_ext] = SCTP_CID_AUTH;
442 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
445 /* Now allocate and fill out the chunk. */
446 retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
450 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
452 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
453 * HEARTBEAT ACK, * etc.) to the same destination transport
454 * address from which it received the DATA or control chunk
455 * to which it is replying.
457 * [INIT ACK back to where the INIT came from.]
459 retval->transport = chunk->transport;
461 retval->subh.init_hdr =
462 sctp_addto_chunk(retval, sizeof(initack), &initack);
463 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
464 sctp_addto_chunk(retval, cookie_len, cookie);
465 if (asoc->peer.ecn_capable)
466 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
468 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
469 ext_param.param_hdr.length =
470 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
471 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
473 sctp_addto_param(retval, num_ext, extensions);
475 if (asoc->peer.prsctp_capable)
476 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
478 if (sp->adaptation_ind) {
479 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
480 aiparam.param_hdr.length = htons(sizeof(aiparam));
481 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
482 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
485 if (asoc->peer.auth_capable) {
486 sctp_addto_chunk(retval, ntohs(auth_random->length),
489 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
492 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
496 /* We need to remove the const qualifier at this point. */
497 retval->asoc = (struct sctp_association *) asoc;
506 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
508 * This chunk is used only during the initialization of an association.
509 * It is sent by the initiator of an association to its peer to complete
510 * the initialization process. This chunk MUST precede any DATA chunk
511 * sent within the association, but MAY be bundled with one or more DATA
512 * chunks in the same packet.
515 * 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
516 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
517 * | Type = 10 |Chunk Flags | Length |
518 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
521 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
525 * Set to zero on transmit and ignored on receipt.
527 * Length: 16 bits (unsigned integer)
529 * Set to the size of the chunk in bytes, including the 4 bytes of
530 * the chunk header and the size of the Cookie.
532 * Cookie: variable size
534 * This field must contain the exact cookie received in the
535 * State Cookie parameter from the previous INIT ACK.
537 * An implementation SHOULD make the cookie as small as possible
538 * to insure interoperability.
540 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
541 const struct sctp_chunk *chunk)
543 struct sctp_chunk *retval;
547 cookie = asoc->peer.cookie;
548 cookie_len = asoc->peer.cookie_len;
550 /* Build a cookie echo chunk. */
551 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
554 retval->subh.cookie_hdr =
555 sctp_addto_chunk(retval, cookie_len, cookie);
557 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
559 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
560 * HEARTBEAT ACK, * etc.) to the same destination transport
561 * address from which it * received the DATA or control chunk
562 * to which it is replying.
564 * [COOKIE ECHO back to where the INIT ACK came from.]
567 retval->transport = chunk->transport;
573 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
575 * This chunk is used only during the initialization of an
576 * association. It is used to acknowledge the receipt of a COOKIE
577 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
578 * within the association, but MAY be bundled with one or more DATA
579 * chunks or SACK chunk in the same SCTP packet.
582 * 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
583 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
584 * | Type = 11 |Chunk Flags | Length = 4 |
585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
587 * Chunk Flags: 8 bits
589 * Set to zero on transmit and ignored on receipt.
591 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
592 const struct sctp_chunk *chunk)
594 struct sctp_chunk *retval;
596 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
598 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
600 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
601 * HEARTBEAT ACK, * etc.) to the same destination transport
602 * address from which it * received the DATA or control chunk
603 * to which it is replying.
605 * [COOKIE ACK back to where the COOKIE ECHO came from.]
608 retval->transport = chunk->transport;
614 * Appendix A: Explicit Congestion Notification:
617 * RFC 2481 details a specific bit for a sender to send in the header of
618 * its next outbound TCP segment to indicate to its peer that it has
619 * reduced its congestion window. This is termed the CWR bit. For
620 * SCTP the same indication is made by including the CWR chunk.
621 * This chunk contains one data element, i.e. the TSN number that
622 * was sent in the ECNE chunk. This element represents the lowest
623 * TSN number in the datagram that was originally marked with the
627 * 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
628 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
629 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
630 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
631 * | Lowest TSN Number |
632 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
634 * Note: The CWR is considered a Control chunk.
636 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
637 const __u32 lowest_tsn,
638 const struct sctp_chunk *chunk)
640 struct sctp_chunk *retval;
643 cwr.lowest_tsn = htonl(lowest_tsn);
644 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
645 sizeof(sctp_cwrhdr_t));
650 retval->subh.ecn_cwr_hdr =
651 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
653 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
655 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
656 * HEARTBEAT ACK, * etc.) to the same destination transport
657 * address from which it * received the DATA or control chunk
658 * to which it is replying.
660 * [Report a reduced congestion window back to where the ECNE
664 retval->transport = chunk->transport;
670 /* Make an ECNE chunk. This is a congestion experienced report. */
671 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
672 const __u32 lowest_tsn)
674 struct sctp_chunk *retval;
677 ecne.lowest_tsn = htonl(lowest_tsn);
678 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
679 sizeof(sctp_ecnehdr_t));
682 retval->subh.ecne_hdr =
683 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
689 /* Make a DATA chunk for the given association from the provided
690 * parameters. However, do not populate the data payload.
692 struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
693 const struct sctp_sndrcvinfo *sinfo,
694 int data_len, __u8 flags, __u16 ssn)
696 struct sctp_chunk *retval;
697 struct sctp_datahdr dp;
700 /* We assign the TSN as LATE as possible, not here when
701 * creating the chunk.
704 dp.stream = htons(sinfo->sinfo_stream);
705 dp.ppid = sinfo->sinfo_ppid;
707 /* Set the flags for an unordered send. */
708 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
709 flags |= SCTP_DATA_UNORDERED;
714 chunk_len = sizeof(dp) + data_len;
715 retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
719 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
720 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
726 /* Create a selective ackowledgement (SACK) for the given
727 * association. This reports on which TSN's we've seen to date,
728 * including duplicates and gaps.
730 struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
732 struct sctp_chunk *retval;
733 struct sctp_sackhdr sack;
736 __u16 num_gabs, num_dup_tsns;
737 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
738 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
740 memset(gabs, 0, sizeof(gabs));
741 ctsn = sctp_tsnmap_get_ctsn(map);
742 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
744 /* How much room is needed in the chunk? */
745 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
746 num_dup_tsns = sctp_tsnmap_num_dups(map);
748 /* Initialize the SACK header. */
749 sack.cum_tsn_ack = htonl(ctsn);
750 sack.a_rwnd = htonl(asoc->a_rwnd);
751 sack.num_gap_ack_blocks = htons(num_gabs);
752 sack.num_dup_tsns = htons(num_dup_tsns);
755 + sizeof(struct sctp_gap_ack_block) * num_gabs
756 + sizeof(__u32) * num_dup_tsns;
758 /* Create the chunk. */
759 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
763 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
765 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
766 * HEARTBEAT ACK, etc.) to the same destination transport
767 * address from which it received the DATA or control chunk to
768 * which it is replying. This rule should also be followed if
769 * the endpoint is bundling DATA chunks together with the
772 * However, when acknowledging multiple DATA chunks received
773 * in packets from different source addresses in a single
774 * SACK, the SACK chunk may be transmitted to one of the
775 * destination transport addresses from which the DATA or
776 * control chunks being acknowledged were received.
778 * [BUG: We do not implement the following paragraph.
779 * Perhaps we should remember the last transport we used for a
780 * SACK and avoid that (if possible) if we have seen any
781 * duplicates. --piggy]
783 * When a receiver of a duplicate DATA chunk sends a SACK to a
784 * multi- homed endpoint it MAY be beneficial to vary the
785 * destination address and not use the source address of the
786 * DATA chunk. The reason being that receiving a duplicate
787 * from a multi-homed endpoint might indicate that the return
788 * path (as specified in the source address of the DATA chunk)
789 * for the SACK is broken.
791 * [Send to the address from which we last received a DATA chunk.]
793 retval->transport = asoc->peer.last_data_from;
795 retval->subh.sack_hdr =
796 sctp_addto_chunk(retval, sizeof(sack), &sack);
798 /* Add the gap ack block information. */
800 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
803 /* Add the duplicate TSN information. */
805 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
806 sctp_tsnmap_get_dups(map));
812 /* Make a SHUTDOWN chunk. */
813 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
814 const struct sctp_chunk *chunk)
816 struct sctp_chunk *retval;
817 sctp_shutdownhdr_t shut;
820 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
821 shut.cum_tsn_ack = htonl(ctsn);
823 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
824 sizeof(sctp_shutdownhdr_t));
828 retval->subh.shutdown_hdr =
829 sctp_addto_chunk(retval, sizeof(shut), &shut);
832 retval->transport = chunk->transport;
837 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
838 const struct sctp_chunk *chunk)
840 struct sctp_chunk *retval;
842 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
844 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
846 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
847 * HEARTBEAT ACK, * etc.) to the same destination transport
848 * address from which it * received the DATA or control chunk
849 * to which it is replying.
851 * [ACK back to where the SHUTDOWN came from.]
854 retval->transport = chunk->transport;
859 struct sctp_chunk *sctp_make_shutdown_complete(
860 const struct sctp_association *asoc,
861 const struct sctp_chunk *chunk)
863 struct sctp_chunk *retval;
866 /* Set the T-bit if we have no association (vtag will be
869 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
871 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
873 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
875 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
876 * HEARTBEAT ACK, * etc.) to the same destination transport
877 * address from which it * received the DATA or control chunk
878 * to which it is replying.
880 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
884 retval->transport = chunk->transport;
889 /* Create an ABORT. Note that we set the T bit if we have no
890 * association, except when responding to an INIT (sctpimpguide 2.41).
892 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
893 const struct sctp_chunk *chunk,
896 struct sctp_chunk *retval;
899 /* Set the T-bit if we have no association and 'chunk' is not
900 * an INIT (vtag will be reflected).
903 if (chunk && chunk->chunk_hdr &&
904 chunk->chunk_hdr->type == SCTP_CID_INIT)
907 flags = SCTP_CHUNK_FLAG_T;
910 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
912 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
914 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
915 * HEARTBEAT ACK, * etc.) to the same destination transport
916 * address from which it * received the DATA or control chunk
917 * to which it is replying.
919 * [ABORT back to where the offender came from.]
922 retval->transport = chunk->transport;
927 /* Helper to create ABORT with a NO_USER_DATA error. */
928 struct sctp_chunk *sctp_make_abort_no_data(
929 const struct sctp_association *asoc,
930 const struct sctp_chunk *chunk, __u32 tsn)
932 struct sctp_chunk *retval;
935 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
941 /* Put the tsn back into network byte order. */
942 payload = htonl(tsn);
943 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
944 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
946 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
948 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
949 * HEARTBEAT ACK, * etc.) to the same destination transport
950 * address from which it * received the DATA or control chunk
951 * to which it is replying.
953 * [ABORT back to where the offender came from.]
956 retval->transport = chunk->transport;
962 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
963 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
964 const struct msghdr *msg,
967 struct sctp_chunk *retval;
968 void *payload = NULL;
971 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
976 /* Put the msg_iov together into payload. */
977 payload = kmalloc(paylen, GFP_KERNEL);
981 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
986 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
987 sctp_addto_chunk(retval, paylen, payload);
997 sctp_chunk_free(retval);
1003 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1006 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1010 int chunklen = ntohs(chunk->chunk_hdr->length);
1012 target = skb_put(chunk->skb, len);
1015 memcpy(target, data, len);
1017 memset(target, 0, len);
1019 /* Adjust the chunk length field. */
1020 chunk->chunk_hdr->length = htons(chunklen + len);
1021 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1026 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1027 struct sctp_chunk *sctp_make_abort_violation(
1028 const struct sctp_association *asoc,
1029 const struct sctp_chunk *chunk,
1030 const __u8 *payload,
1031 const size_t paylen)
1033 struct sctp_chunk *retval;
1034 struct sctp_paramhdr phdr;
1036 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
1037 + sizeof(sctp_paramhdr_t));
1041 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1042 + sizeof(sctp_paramhdr_t));
1044 phdr.type = htons(chunk->chunk_hdr->type);
1045 phdr.length = chunk->chunk_hdr->length;
1046 sctp_addto_chunk(retval, paylen, payload);
1047 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1053 struct sctp_chunk *sctp_make_violation_paramlen(
1054 const struct sctp_association *asoc,
1055 const struct sctp_chunk *chunk,
1056 struct sctp_paramhdr *param)
1058 struct sctp_chunk *retval;
1059 static const char error[] = "The following parameter had invalid length:";
1060 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1061 sizeof(sctp_paramhdr_t);
1063 retval = sctp_make_abort(asoc, chunk, payload_len);
1067 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1068 sizeof(error) + sizeof(sctp_paramhdr_t));
1069 sctp_addto_chunk(retval, sizeof(error), error);
1070 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1076 /* Make a HEARTBEAT chunk. */
1077 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1078 const struct sctp_transport *transport)
1080 struct sctp_chunk *retval;
1081 sctp_sender_hb_info_t hbinfo;
1083 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo));
1088 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1089 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1090 hbinfo.daddr = transport->ipaddr;
1091 hbinfo.sent_at = jiffies;
1092 hbinfo.hb_nonce = transport->hb_nonce;
1094 /* Cast away the 'const', as this is just telling the chunk
1095 * what transport it belongs to.
1097 retval->transport = (struct sctp_transport *) transport;
1098 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1105 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1106 const struct sctp_chunk *chunk,
1107 const void *payload, const size_t paylen)
1109 struct sctp_chunk *retval;
1111 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1115 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1117 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1119 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1120 * HEARTBEAT ACK, * etc.) to the same destination transport
1121 * address from which it * received the DATA or control chunk
1122 * to which it is replying.
1124 * [HBACK back to where the HEARTBEAT came from.]
1127 retval->transport = chunk->transport;
1133 /* Create an Operation Error chunk with the specified space reserved.
1134 * This routine can be used for containing multiple causes in the chunk.
1136 static struct sctp_chunk *sctp_make_op_error_space(
1137 const struct sctp_association *asoc,
1138 const struct sctp_chunk *chunk,
1141 struct sctp_chunk *retval;
1143 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1144 sizeof(sctp_errhdr_t) + size);
1148 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1150 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1151 * HEARTBEAT ACK, etc.) to the same destination transport
1152 * address from which it received the DATA or control chunk
1153 * to which it is replying.
1157 retval->transport = chunk->transport;
1163 /* Create an Operation Error chunk of a fixed size,
1164 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1165 * This is a helper function to allocate an error chunk for
1166 * for those invalid parameter codes in which we may not want
1167 * to report all the errors, if the incomming chunk is large
1169 static inline struct sctp_chunk *sctp_make_op_error_fixed(
1170 const struct sctp_association *asoc,
1171 const struct sctp_chunk *chunk)
1173 size_t size = asoc ? asoc->pathmtu : 0;
1176 size = SCTP_DEFAULT_MAXSEGMENT;
1178 return sctp_make_op_error_space(asoc, chunk, size);
1181 /* Create an Operation Error chunk. */
1182 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1183 const struct sctp_chunk *chunk,
1184 __be16 cause_code, const void *payload,
1185 size_t paylen, size_t reserve_tail)
1187 struct sctp_chunk *retval;
1189 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1193 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1194 sctp_addto_chunk(retval, paylen, payload);
1196 sctp_addto_param(retval, reserve_tail, NULL);
1202 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1204 struct sctp_chunk *retval;
1205 struct sctp_hmac *hmac_desc;
1206 struct sctp_authhdr auth_hdr;
1209 /* Get the first hmac that the peer told us to use */
1210 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1211 if (unlikely(!hmac_desc))
1214 retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0,
1215 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1219 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1220 auth_hdr.shkey_id = htons(asoc->active_key_id);
1222 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1225 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1226 memset(hmac, 0, hmac_desc->hmac_len);
1228 /* Adjust the chunk header to include the empty MAC */
1229 retval->chunk_hdr->length =
1230 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1231 retval->chunk_end = skb_tail_pointer(retval->skb);
1237 /********************************************************************
1238 * 2nd Level Abstractions
1239 ********************************************************************/
1241 /* Turn an skb into a chunk.
1242 * FIXME: Eventually move the structure directly inside the skb->cb[].
1244 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1245 const struct sctp_association *asoc,
1248 struct sctp_chunk *retval;
1250 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
1256 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
1259 INIT_LIST_HEAD(&retval->list);
1261 retval->asoc = (struct sctp_association *)asoc;
1262 retval->has_tsn = 0;
1263 retval->has_ssn = 0;
1264 retval->rtt_in_progress = 0;
1265 retval->sent_at = 0;
1266 retval->singleton = 1;
1267 retval->end_of_packet = 0;
1268 retval->ecn_ce_done = 0;
1269 retval->pdiscard = 0;
1271 /* sctpimpguide-05.txt Section 2.8.2
1272 * M1) Each time a new DATA chunk is transmitted
1273 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1274 * 'TSN.Missing.Report' count will be used to determine missing chunks
1275 * and when to fast retransmit.
1277 retval->tsn_missing_report = 0;
1278 retval->tsn_gap_acked = 0;
1279 retval->fast_retransmit = SCTP_CAN_FRTX;
1281 /* If this is a fragmented message, track all fragments
1282 * of the message (for SEND_FAILED).
1286 /* Polish the bead hole. */
1287 INIT_LIST_HEAD(&retval->transmitted_list);
1288 INIT_LIST_HEAD(&retval->frag_list);
1289 SCTP_DBG_OBJCNT_INC(chunk);
1290 atomic_set(&retval->refcnt, 1);
1296 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1297 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1298 union sctp_addr *dest)
1300 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1301 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1304 /* Extract the source address from a chunk. */
1305 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1307 /* If we have a known transport, use that. */
1308 if (chunk->transport) {
1309 return &chunk->transport->ipaddr;
1311 /* Otherwise, extract it from the IP header. */
1312 return &chunk->source;
1316 /* Create a new chunk, setting the type and flags headers from the
1317 * arguments, reserving enough space for a 'paylen' byte payload.
1320 struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1321 __u8 type, __u8 flags, int paylen)
1323 struct sctp_chunk *retval;
1324 sctp_chunkhdr_t *chunk_hdr;
1325 struct sk_buff *skb;
1329 chunklen = WORD_ROUND(sizeof(*chunk_hdr) + paylen);
1330 if (chunklen > SCTP_MAX_CHUNK_LEN)
1333 /* No need to allocate LL here, as this is only a chunk. */
1334 skb = alloc_skb(chunklen, GFP_ATOMIC);
1338 /* Make room for the chunk header. */
1339 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1340 chunk_hdr->type = type;
1341 chunk_hdr->flags = flags;
1342 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1344 sk = asoc ? asoc->base.sk : NULL;
1345 retval = sctp_chunkify(skb, asoc, sk);
1351 retval->chunk_hdr = chunk_hdr;
1352 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1354 /* Determine if the chunk needs to be authenticated */
1355 if (sctp_auth_send_cid(type, asoc))
1358 /* Set the skb to the belonging sock for accounting. */
1367 /* Release the memory occupied by a chunk. */
1368 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1370 BUG_ON(!list_empty(&chunk->list));
1371 list_del_init(&chunk->transmitted_list);
1373 consume_skb(chunk->skb);
1374 consume_skb(chunk->auth_chunk);
1376 SCTP_DBG_OBJCNT_DEC(chunk);
1377 kmem_cache_free(sctp_chunk_cachep, chunk);
1380 /* Possibly, free the chunk. */
1381 void sctp_chunk_free(struct sctp_chunk *chunk)
1383 /* Release our reference on the message tracker. */
1385 sctp_datamsg_put(chunk->msg);
1387 sctp_chunk_put(chunk);
1390 /* Grab a reference to the chunk. */
1391 void sctp_chunk_hold(struct sctp_chunk *ch)
1393 atomic_inc(&ch->refcnt);
1396 /* Release a reference to the chunk. */
1397 void sctp_chunk_put(struct sctp_chunk *ch)
1399 if (atomic_dec_and_test(&ch->refcnt))
1400 sctp_chunk_destroy(ch);
1403 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1406 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1410 int chunklen = ntohs(chunk->chunk_hdr->length);
1411 int padlen = WORD_ROUND(chunklen) - chunklen;
1413 padding = skb_put(chunk->skb, padlen);
1414 target = skb_put(chunk->skb, len);
1416 memset(padding, 0, padlen);
1417 memcpy(target, data, len);
1419 /* Adjust the chunk length field. */
1420 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1421 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1426 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1427 * space in the chunk
1429 void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1430 int len, const void *data)
1432 if (skb_tailroom(chunk->skb) >= len)
1433 return sctp_addto_chunk(chunk, len, data);
1438 /* Append bytes from user space to the end of a chunk. Will panic if
1439 * chunk is not big enough.
1440 * Returns a kernel err value.
1442 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1448 /* Make room in chunk for data. */
1449 target = skb_put(chunk->skb, len);
1451 /* Copy data (whole iovec) into chunk */
1452 if ((err = memcpy_fromiovecend(target, data, off, len)))
1455 /* Adjust the chunk length field. */
1456 chunk->chunk_hdr->length =
1457 htons(ntohs(chunk->chunk_hdr->length) + len);
1458 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1464 /* Helper function to assign a TSN if needed. This assumes that both
1465 * the data_hdr and association have already been assigned.
1467 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1469 struct sctp_datamsg *msg;
1470 struct sctp_chunk *lchunk;
1471 struct sctp_stream *stream;
1478 /* All fragments will be on the same stream */
1479 sid = ntohs(chunk->subh.data_hdr->stream);
1480 stream = &chunk->asoc->ssnmap->out;
1482 /* Now assign the sequence number to the entire message.
1483 * All fragments must have the same stream sequence number.
1486 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1487 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1490 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1491 ssn = sctp_ssn_next(stream, sid);
1493 ssn = sctp_ssn_peek(stream, sid);
1496 lchunk->subh.data_hdr->ssn = htons(ssn);
1497 lchunk->has_ssn = 1;
1501 /* Helper function to assign a TSN if needed. This assumes that both
1502 * the data_hdr and association have already been assigned.
1504 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1506 if (!chunk->has_tsn) {
1507 /* This is the last possible instant to
1510 chunk->subh.data_hdr->tsn =
1511 htonl(sctp_association_get_next_tsn(chunk->asoc));
1516 /* Create a CLOSED association to use with an incoming packet. */
1517 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1518 struct sctp_chunk *chunk,
1521 struct sctp_association *asoc;
1522 struct sk_buff *skb;
1526 /* Create the bare association. */
1527 scope = sctp_scope(sctp_source(chunk));
1528 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1533 /* Create an entry for the source address of the packet. */
1534 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
1537 af->from_skb(&asoc->c.peer_addr, skb, 1);
1542 sctp_association_free(asoc);
1546 /* Build a cookie representing asoc.
1547 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1549 static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1550 const struct sctp_association *asoc,
1551 const struct sctp_chunk *init_chunk,
1553 const __u8 *raw_addrs, int addrs_len)
1555 sctp_cookie_param_t *retval;
1556 struct sctp_signed_cookie *cookie;
1557 struct scatterlist sg;
1558 int headersize, bodysize;
1559 unsigned int keylen;
1562 /* Header size is static data prior to the actual cookie, including
1565 headersize = sizeof(sctp_paramhdr_t) +
1566 (sizeof(struct sctp_signed_cookie) -
1567 sizeof(struct sctp_cookie));
1568 bodysize = sizeof(struct sctp_cookie)
1569 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1571 /* Pad out the cookie to a multiple to make the signature
1572 * functions simpler to write.
1574 if (bodysize % SCTP_COOKIE_MULTIPLE)
1575 bodysize += SCTP_COOKIE_MULTIPLE
1576 - (bodysize % SCTP_COOKIE_MULTIPLE);
1577 *cookie_len = headersize + bodysize;
1579 /* Clear this memory since we are sending this data structure
1580 * out on the network.
1582 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1586 cookie = (struct sctp_signed_cookie *) retval->body;
1588 /* Set up the parameter header. */
1589 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1590 retval->p.length = htons(*cookie_len);
1592 /* Copy the cookie part of the association itself. */
1593 cookie->c = asoc->c;
1594 /* Save the raw address list length in the cookie. */
1595 cookie->c.raw_addr_list_len = addrs_len;
1597 /* Remember PR-SCTP capability. */
1598 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1600 /* Save adaptation indication in the cookie. */
1601 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1603 /* Set an expiration time for the cookie. */
1604 do_gettimeofday(&cookie->c.expiration);
1605 TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
1607 /* Copy the peer's init packet. */
1608 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1609 ntohs(init_chunk->chunk_hdr->length));
1611 /* Copy the raw local address list of the association. */
1612 memcpy((__u8 *)&cookie->c.peer_init[0] +
1613 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1615 if (sctp_sk(ep->base.sk)->hmac) {
1616 struct hash_desc desc;
1618 /* Sign the message. */
1619 sg_init_one(&sg, &cookie->c, bodysize);
1620 keylen = SCTP_SECRET_SIZE;
1621 key = (char *)ep->secret_key[ep->current_key];
1622 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1625 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1626 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1639 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1640 struct sctp_association *sctp_unpack_cookie(
1641 const struct sctp_endpoint *ep,
1642 const struct sctp_association *asoc,
1643 struct sctp_chunk *chunk, gfp_t gfp,
1644 int *error, struct sctp_chunk **errp)
1646 struct sctp_association *retval = NULL;
1647 struct sctp_signed_cookie *cookie;
1648 struct sctp_cookie *bear_cookie;
1649 int headersize, bodysize, fixed_size;
1650 __u8 *digest = ep->digest;
1651 struct scatterlist sg;
1652 unsigned int keylen, len;
1655 struct sk_buff *skb = chunk->skb;
1657 struct hash_desc desc;
1659 /* Header size is static data prior to the actual cookie, including
1662 headersize = sizeof(sctp_chunkhdr_t) +
1663 (sizeof(struct sctp_signed_cookie) -
1664 sizeof(struct sctp_cookie));
1665 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1666 fixed_size = headersize + sizeof(struct sctp_cookie);
1668 /* Verify that the chunk looks like it even has a cookie.
1669 * There must be enough room for our cookie and our peer's
1672 len = ntohs(chunk->chunk_hdr->length);
1673 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1676 /* Verify that the cookie has been padded out. */
1677 if (bodysize % SCTP_COOKIE_MULTIPLE)
1680 /* Process the cookie. */
1681 cookie = chunk->subh.cookie_hdr;
1682 bear_cookie = &cookie->c;
1684 if (!sctp_sk(ep->base.sk)->hmac)
1687 /* Check the signature. */
1688 keylen = SCTP_SECRET_SIZE;
1689 sg_init_one(&sg, bear_cookie, bodysize);
1690 key = (char *)ep->secret_key[ep->current_key];
1691 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1694 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1695 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1696 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1697 *error = -SCTP_IERROR_NOMEM;
1701 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1702 /* Try the previous key. */
1703 key = (char *)ep->secret_key[ep->last_key];
1704 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1705 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1706 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1707 *error = -SCTP_IERROR_NOMEM;
1711 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1712 /* Yikes! Still bad signature! */
1713 *error = -SCTP_IERROR_BAD_SIG;
1719 /* IG Section 2.35.2:
1720 * 3) Compare the port numbers and the verification tag contained
1721 * within the COOKIE ECHO chunk to the actual port numbers and the
1722 * verification tag within the SCTP common header of the received
1723 * packet. If these values do not match the packet MUST be silently
1726 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1727 *error = -SCTP_IERROR_BAD_TAG;
1731 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1732 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1733 *error = -SCTP_IERROR_BAD_PORTS;
1737 /* Check to see if the cookie is stale. If there is already
1738 * an association, there is no need to check cookie's expiration
1739 * for init collision case of lost COOKIE ACK.
1740 * If skb has been timestamped, then use the stamp, otherwise
1741 * use current time. This introduces a small possibility that
1742 * that a cookie may be considered expired, but his would only slow
1743 * down the new association establishment instead of every packet.
1745 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1746 skb_get_timestamp(skb, &tv);
1748 do_gettimeofday(&tv);
1750 if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
1752 * Section 3.3.10.3 Stale Cookie Error (3)
1756 * Stale Cookie Error: Indicates the receipt of a valid State
1757 * Cookie that has expired.
1759 len = ntohs(chunk->chunk_hdr->length);
1760 *errp = sctp_make_op_error_space(asoc, chunk, len);
1762 suseconds_t usecs = (tv.tv_sec -
1763 bear_cookie->expiration.tv_sec) * 1000000L +
1764 tv.tv_usec - bear_cookie->expiration.tv_usec;
1765 __be32 n = htonl(usecs);
1767 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
1769 sctp_addto_chunk(*errp, sizeof(n), &n);
1770 *error = -SCTP_IERROR_STALE_COOKIE;
1772 *error = -SCTP_IERROR_NOMEM;
1777 /* Make a new base association. */
1778 scope = sctp_scope(sctp_source(chunk));
1779 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1781 *error = -SCTP_IERROR_NOMEM;
1785 /* Set up our peer's port number. */
1786 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1788 /* Populate the association from the cookie. */
1789 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1791 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1793 *error = -SCTP_IERROR_NOMEM;
1797 /* Also, add the destination address. */
1798 if (list_empty(&retval->base.bind_addr.address_list)) {
1799 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1800 SCTP_ADDR_SRC, GFP_ATOMIC);
1803 retval->next_tsn = retval->c.initial_tsn;
1804 retval->ctsn_ack_point = retval->next_tsn - 1;
1805 retval->addip_serial = retval->c.initial_tsn;
1806 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1807 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1808 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1810 /* The INIT stuff will be done by the side effects. */
1815 sctp_association_free(retval);
1820 /* Yikes! The packet is either corrupt or deliberately
1823 *error = -SCTP_IERROR_MALFORMED;
1827 /********************************************************************
1828 * 3rd Level Abstractions
1829 ********************************************************************/
1831 struct __sctp_missing {
1837 * Report a missing mandatory parameter.
1839 static int sctp_process_missing_param(const struct sctp_association *asoc,
1840 sctp_param_t paramtype,
1841 struct sctp_chunk *chunk,
1842 struct sctp_chunk **errp)
1844 struct __sctp_missing report;
1847 len = WORD_ROUND(sizeof(report));
1849 /* Make an ERROR chunk, preparing enough room for
1850 * returning multiple unknown parameters.
1853 *errp = sctp_make_op_error_space(asoc, chunk, len);
1856 report.num_missing = htonl(1);
1857 report.type = paramtype;
1858 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1860 sctp_addto_chunk(*errp, sizeof(report), &report);
1863 /* Stop processing this chunk. */
1867 /* Report an Invalid Mandatory Parameter. */
1868 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1869 struct sctp_chunk *chunk,
1870 struct sctp_chunk **errp)
1872 /* Invalid Mandatory Parameter Error has no payload. */
1875 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1878 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1880 /* Stop processing this chunk. */
1884 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1885 struct sctp_paramhdr *param,
1886 const struct sctp_chunk *chunk,
1887 struct sctp_chunk **errp)
1889 /* This is a fatal error. Any accumulated non-fatal errors are
1893 sctp_chunk_free(*errp);
1895 /* Create an error chunk and fill it in with our payload. */
1896 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1902 /* Do not attempt to handle the HOST_NAME parm. However, do
1903 * send back an indicator to the peer.
1905 static int sctp_process_hn_param(const struct sctp_association *asoc,
1906 union sctp_params param,
1907 struct sctp_chunk *chunk,
1908 struct sctp_chunk **errp)
1910 __u16 len = ntohs(param.p->length);
1912 /* Processing of the HOST_NAME parameter will generate an
1913 * ABORT. If we've accumulated any non-fatal errors, they
1914 * would be unrecognized parameters and we should not include
1915 * them in the ABORT.
1918 sctp_chunk_free(*errp);
1920 *errp = sctp_make_op_error_space(asoc, chunk, len);
1923 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1924 sctp_addto_chunk(*errp, len, param.v);
1927 /* Stop processing this chunk. */
1931 static int sctp_verify_ext_param(union sctp_params param)
1933 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1935 int have_asconf = 0;
1938 for (i = 0; i < num_ext; i++) {
1939 switch (param.ext->chunks[i]) {
1943 case SCTP_CID_ASCONF:
1944 case SCTP_CID_ASCONF_ACK:
1950 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1951 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1952 * only if ADD-IP is turned on and we are not backward-compatible
1955 if (sctp_addip_noauth)
1958 if (sctp_addip_enable && !have_auth && have_asconf)
1964 static void sctp_process_ext_param(struct sctp_association *asoc,
1965 union sctp_params param)
1967 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1970 for (i = 0; i < num_ext; i++) {
1971 switch (param.ext->chunks[i]) {
1972 case SCTP_CID_FWD_TSN:
1973 if (sctp_prsctp_enable &&
1974 !asoc->peer.prsctp_capable)
1975 asoc->peer.prsctp_capable = 1;
1978 /* if the peer reports AUTH, assume that he
1981 if (sctp_auth_enable)
1982 asoc->peer.auth_capable = 1;
1984 case SCTP_CID_ASCONF:
1985 case SCTP_CID_ASCONF_ACK:
1986 if (sctp_addip_enable)
1987 asoc->peer.asconf_capable = 1;
1995 /* RFC 3.2.1 & the Implementers Guide 2.2.
1997 * The Parameter Types are encoded such that the
1998 * highest-order two bits specify the action that must be
1999 * taken if the processing endpoint does not recognize the
2002 * 00 - Stop processing this parameter; do not process any further
2003 * parameters within this chunk
2005 * 01 - Stop processing this parameter, do not process any further
2006 * parameters within this chunk, and report the unrecognized
2007 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2009 * 10 - Skip this parameter and continue processing.
2011 * 11 - Skip this parameter and continue processing but
2012 * report the unrecognized parameter in an
2013 * 'Unrecognized Parameter' ERROR chunk.
2016 * SCTP_IERROR_NO_ERROR - continue with the chunk
2017 * SCTP_IERROR_ERROR - stop and report an error.
2018 * SCTP_IERROR_NOMEME - out of memory.
2020 static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2021 union sctp_params param,
2022 struct sctp_chunk *chunk,
2023 struct sctp_chunk **errp)
2025 int retval = SCTP_IERROR_NO_ERROR;
2027 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2028 case SCTP_PARAM_ACTION_DISCARD:
2029 retval = SCTP_IERROR_ERROR;
2031 case SCTP_PARAM_ACTION_SKIP:
2033 case SCTP_PARAM_ACTION_DISCARD_ERR:
2034 retval = SCTP_IERROR_ERROR;
2036 case SCTP_PARAM_ACTION_SKIP_ERR:
2037 /* Make an ERROR chunk, preparing enough room for
2038 * returning multiple unknown parameters.
2041 *errp = sctp_make_op_error_fixed(asoc, chunk);
2044 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2045 WORD_ROUND(ntohs(param.p->length))))
2046 sctp_addto_chunk_fixed(*errp,
2047 WORD_ROUND(ntohs(param.p->length)),
2050 /* If there is no memory for generating the ERROR
2051 * report as specified, an ABORT will be triggered
2052 * to the peer and the association won't be
2055 retval = SCTP_IERROR_NOMEM;
2065 /* Verify variable length parameters
2067 * SCTP_IERROR_ABORT - trigger an ABORT
2068 * SCTP_IERROR_NOMEM - out of memory (abort)
2069 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2070 * SCTP_IERROR_NO_ERROR - continue with the chunk
2072 static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc,
2073 union sctp_params param,
2075 struct sctp_chunk *chunk,
2076 struct sctp_chunk **err_chunk)
2078 struct sctp_hmac_algo_param *hmacs;
2079 int retval = SCTP_IERROR_NO_ERROR;
2080 __u16 n_elt, id = 0;
2083 /* FIXME - This routine is not looking at each parameter per the
2084 * chunk type, i.e., unrecognized parameters should be further
2085 * identified based on the chunk id.
2088 switch (param.p->type) {
2089 case SCTP_PARAM_IPV4_ADDRESS:
2090 case SCTP_PARAM_IPV6_ADDRESS:
2091 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2092 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2093 case SCTP_PARAM_STATE_COOKIE:
2094 case SCTP_PARAM_HEARTBEAT_INFO:
2095 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2096 case SCTP_PARAM_ECN_CAPABLE:
2097 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2100 case SCTP_PARAM_SUPPORTED_EXT:
2101 if (!sctp_verify_ext_param(param))
2102 return SCTP_IERROR_ABORT;
2105 case SCTP_PARAM_SET_PRIMARY:
2106 if (sctp_addip_enable)
2110 case SCTP_PARAM_HOST_NAME_ADDRESS:
2111 /* Tell the peer, we won't support this param. */
2112 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2113 retval = SCTP_IERROR_ABORT;
2116 case SCTP_PARAM_FWD_TSN_SUPPORT:
2117 if (sctp_prsctp_enable)
2121 case SCTP_PARAM_RANDOM:
2122 if (!sctp_auth_enable)
2125 /* SCTP-AUTH: Secion 6.1
2126 * If the random number is not 32 byte long the association
2127 * MUST be aborted. The ABORT chunk SHOULD contain the error
2128 * cause 'Protocol Violation'.
2130 if (SCTP_AUTH_RANDOM_LENGTH !=
2131 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2132 sctp_process_inv_paramlength(asoc, param.p,
2134 retval = SCTP_IERROR_ABORT;
2138 case SCTP_PARAM_CHUNKS:
2139 if (!sctp_auth_enable)
2142 /* SCTP-AUTH: Section 3.2
2143 * The CHUNKS parameter MUST be included once in the INIT or
2144 * INIT-ACK chunk if the sender wants to receive authenticated
2145 * chunks. Its maximum length is 260 bytes.
2147 if (260 < ntohs(param.p->length)) {
2148 sctp_process_inv_paramlength(asoc, param.p,
2150 retval = SCTP_IERROR_ABORT;
2154 case SCTP_PARAM_HMAC_ALGO:
2155 if (!sctp_auth_enable)
2158 hmacs = (struct sctp_hmac_algo_param *)param.p;
2159 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2161 /* SCTP-AUTH: Section 6.1
2162 * The HMAC algorithm based on SHA-1 MUST be supported and
2163 * included in the HMAC-ALGO parameter.
2165 for (i = 0; i < n_elt; i++) {
2166 id = ntohs(hmacs->hmac_ids[i]);
2168 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2172 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2173 sctp_process_inv_paramlength(asoc, param.p, chunk,
2175 retval = SCTP_IERROR_ABORT;
2180 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2181 ntohs(param.p->type), cid);
2182 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2188 /* Verify the INIT packet before we process it. */
2189 int sctp_verify_init(const struct sctp_association *asoc,
2191 sctp_init_chunk_t *peer_init,
2192 struct sctp_chunk *chunk,
2193 struct sctp_chunk **errp)
2195 union sctp_params param;
2199 /* Verify stream values are non-zero. */
2200 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
2201 (0 == peer_init->init_hdr.num_inbound_streams) ||
2202 (0 == peer_init->init_hdr.init_tag) ||
2203 (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
2205 return sctp_process_inv_mandatory(asoc, chunk, errp);
2208 /* Check for missing mandatory parameters. */
2209 sctp_walk_params(param, peer_init, init_hdr.params) {
2211 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
2214 } /* for (loop through all parameters) */
2216 /* There is a possibility that a parameter length was bad and
2217 * in that case we would have stoped walking the parameters.
2218 * The current param.p would point at the bad one.
2219 * Current consensus on the mailing list is to generate a PROTOCOL
2220 * VIOLATION error. We build the ERROR chunk here and let the normal
2221 * error handling code build and send the packet.
2223 if (param.v != (void*)chunk->chunk_end)
2224 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2226 /* The only missing mandatory param possible today is
2227 * the state cookie for an INIT-ACK chunk.
2229 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2230 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2233 /* Verify all the variable length parameters */
2234 sctp_walk_params(param, peer_init, init_hdr.params) {
2236 result = sctp_verify_param(asoc, param, cid, chunk, errp);
2238 case SCTP_IERROR_ABORT:
2239 case SCTP_IERROR_NOMEM:
2241 case SCTP_IERROR_ERROR:
2243 case SCTP_IERROR_NO_ERROR:
2248 } /* for (loop through all parameters) */
2253 /* Unpack the parameters in an INIT packet into an association.
2254 * Returns 0 on failure, else success.
2255 * FIXME: This is an association method.
2257 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2258 const union sctp_addr *peer_addr,
2259 sctp_init_chunk_t *peer_init, gfp_t gfp)
2261 union sctp_params param;
2262 struct sctp_transport *transport;
2263 struct list_head *pos, *temp;
2265 union sctp_addr addr;
2269 /* We must include the address that the INIT packet came from.
2270 * This is the only address that matters for an INIT packet.
2271 * When processing a COOKIE ECHO, we retrieve the from address
2272 * of the INIT from the cookie.
2275 /* This implementation defaults to making the first transport
2276 * added as the primary transport. The source address seems to
2277 * be a a better choice than any of the embedded addresses.
2279 if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2282 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2285 /* Process the initialization parameters. */
2286 sctp_walk_params(param, peer_init, init_hdr.params) {
2287 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2288 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2289 af = sctp_get_af_specific(param_type2af(param.p->type));
2290 af->from_addr_param(&addr, param.addr,
2291 chunk->sctp_hdr->source, 0);
2292 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2296 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2300 /* source address of chunk may not match any valid address */
2304 /* AUTH: After processing the parameters, make sure that we
2305 * have all the required info to potentially do authentications.
2307 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2308 !asoc->peer.peer_hmacs))
2309 asoc->peer.auth_capable = 0;
2311 /* In a non-backward compatible mode, if the peer claims
2312 * support for ADD-IP but not AUTH, the ADD-IP spec states
2313 * that we MUST ABORT the association. Section 6. The section
2314 * also give us an option to silently ignore the packet, which
2315 * is what we'll do here.
2317 if (!sctp_addip_noauth &&
2318 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2319 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2321 SCTP_PARAM_SET_PRIMARY);
2322 asoc->peer.asconf_capable = 0;
2326 /* Walk list of transports, removing transports in the UNKNOWN state. */
2327 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2328 transport = list_entry(pos, struct sctp_transport, transports);
2329 if (transport->state == SCTP_UNKNOWN) {
2330 sctp_assoc_rm_peer(asoc, transport);
2334 /* The fixed INIT headers are always in network byte
2337 asoc->peer.i.init_tag =
2338 ntohl(peer_init->init_hdr.init_tag);
2339 asoc->peer.i.a_rwnd =
2340 ntohl(peer_init->init_hdr.a_rwnd);
2341 asoc->peer.i.num_outbound_streams =
2342 ntohs(peer_init->init_hdr.num_outbound_streams);
2343 asoc->peer.i.num_inbound_streams =
2344 ntohs(peer_init->init_hdr.num_inbound_streams);
2345 asoc->peer.i.initial_tsn =
2346 ntohl(peer_init->init_hdr.initial_tsn);
2348 /* Apply the upper bounds for output streams based on peer's
2349 * number of inbound streams.
2351 if (asoc->c.sinit_num_ostreams >
2352 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2353 asoc->c.sinit_num_ostreams =
2354 ntohs(peer_init->init_hdr.num_inbound_streams);
2357 if (asoc->c.sinit_max_instreams >
2358 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2359 asoc->c.sinit_max_instreams =
2360 ntohs(peer_init->init_hdr.num_outbound_streams);
2363 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2364 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2366 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2367 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2369 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2370 cookie = asoc->peer.cookie;
2372 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
2373 if (!asoc->peer.cookie)
2377 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2378 * high (for example, implementations MAY use the size of the receiver
2379 * advertised window).
2381 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2383 transport->ssthresh = asoc->peer.i.a_rwnd;
2386 /* Set up the TSN tracking pieces. */
2387 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2388 asoc->peer.i.initial_tsn, gfp))
2391 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2393 * The stream sequence number in all the streams shall start
2394 * from 0 when the association is established. Also, when the
2395 * stream sequence number reaches the value 65535 the next
2396 * stream sequence number shall be set to 0.
2399 /* Allocate storage for the negotiated streams if it is not a temporary
2405 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2406 asoc->c.sinit_num_ostreams, gfp);
2410 error = sctp_assoc_set_id(asoc, gfp);
2415 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2417 * When an endpoint has an ASCONF signaled change to be sent to the
2418 * remote endpoint it should do the following:
2420 * A2) A serial number should be assigned to the Chunk. The serial
2421 * number should be a monotonically increasing number. All serial
2422 * numbers are defined to be initialized at the start of the
2423 * association to the same value as the Initial TSN.
2425 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2429 /* Release the transport structures. */
2430 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2431 transport = list_entry(pos, struct sctp_transport, transports);
2432 if (transport->state != SCTP_ACTIVE)
2433 sctp_assoc_rm_peer(asoc, transport);
2441 /* Update asoc with the option described in param.
2443 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2445 * asoc is the association to update.
2446 * param is the variable length parameter to use for update.
2447 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2448 * If the current packet is an INIT we want to minimize the amount of
2449 * work we do. In particular, we should not build transport
2450 * structures for the addresses.
2452 static int sctp_process_param(struct sctp_association *asoc,
2453 union sctp_params param,
2454 const union sctp_addr *peer_addr,
2457 union sctp_addr addr;
2464 union sctp_addr_param *addr_param;
2465 struct sctp_transport *t;
2467 /* We maintain all INIT parameters in network byte order all the
2468 * time. This allows us to not worry about whether the parameters
2469 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2471 switch (param.p->type) {
2472 case SCTP_PARAM_IPV6_ADDRESS:
2473 if (PF_INET6 != asoc->base.sk->sk_family)
2477 case SCTP_PARAM_IPV4_ADDRESS:
2478 /* v4 addresses are not allowed on v6-only socket */
2479 if (ipv6_only_sock(asoc->base.sk))
2482 af = sctp_get_af_specific(param_type2af(param.p->type));
2483 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
2484 scope = sctp_scope(peer_addr);
2485 if (sctp_in_scope(&addr, scope))
2486 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2490 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2491 if (!sctp_cookie_preserve_enable)
2494 stale = ntohl(param.life->lifespan_increment);
2496 /* Suggested Cookie Life span increment's unit is msec,
2499 asoc->cookie_life.tv_sec += stale / 1000;
2500 asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
2503 case SCTP_PARAM_HOST_NAME_ADDRESS:
2504 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2507 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2508 /* Turn off the default values first so we'll know which
2509 * ones are really set by the peer.
2511 asoc->peer.ipv4_address = 0;
2512 asoc->peer.ipv6_address = 0;
2514 /* Assume that peer supports the address family
2515 * by which it sends a packet.
2517 if (peer_addr->sa.sa_family == AF_INET6)
2518 asoc->peer.ipv6_address = 1;
2519 else if (peer_addr->sa.sa_family == AF_INET)
2520 asoc->peer.ipv4_address = 1;
2522 /* Cycle through address types; avoid divide by 0. */
2523 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2525 sat /= sizeof(__u16);
2527 for (i = 0; i < sat; ++i) {
2528 switch (param.sat->types[i]) {
2529 case SCTP_PARAM_IPV4_ADDRESS:
2530 asoc->peer.ipv4_address = 1;
2533 case SCTP_PARAM_IPV6_ADDRESS:
2534 if (PF_INET6 == asoc->base.sk->sk_family)
2535 asoc->peer.ipv6_address = 1;
2538 case SCTP_PARAM_HOST_NAME_ADDRESS:
2539 asoc->peer.hostname_address = 1;
2542 default: /* Just ignore anything else. */
2548 case SCTP_PARAM_STATE_COOKIE:
2549 asoc->peer.cookie_len =
2550 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2551 asoc->peer.cookie = param.cookie->body;
2554 case SCTP_PARAM_HEARTBEAT_INFO:
2555 /* Would be odd to receive, but it causes no problems. */
2558 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2559 /* Rejected during verify stage. */
2562 case SCTP_PARAM_ECN_CAPABLE:
2563 asoc->peer.ecn_capable = 1;
2566 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2567 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2570 case SCTP_PARAM_SET_PRIMARY:
2571 if (!sctp_addip_enable)
2574 addr_param = param.v + sizeof(sctp_addip_param_t);
2576 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2580 af->from_addr_param(&addr, addr_param,
2581 htons(asoc->peer.port), 0);
2583 /* if the address is invalid, we can't process it.
2584 * XXX: see spec for what to do.
2586 if (!af->addr_valid(&addr, NULL, NULL))
2589 t = sctp_assoc_lookup_paddr(asoc, &addr);
2593 sctp_assoc_set_primary(asoc, t);
2596 case SCTP_PARAM_SUPPORTED_EXT:
2597 sctp_process_ext_param(asoc, param);
2600 case SCTP_PARAM_FWD_TSN_SUPPORT:
2601 if (sctp_prsctp_enable) {
2602 asoc->peer.prsctp_capable = 1;
2608 case SCTP_PARAM_RANDOM:
2609 if (!sctp_auth_enable)
2612 /* Save peer's random parameter */
2613 asoc->peer.peer_random = kmemdup(param.p,
2614 ntohs(param.p->length), gfp);
2615 if (!asoc->peer.peer_random) {
2621 case SCTP_PARAM_HMAC_ALGO:
2622 if (!sctp_auth_enable)
2625 /* Save peer's HMAC list */
2626 asoc->peer.peer_hmacs = kmemdup(param.p,
2627 ntohs(param.p->length), gfp);
2628 if (!asoc->peer.peer_hmacs) {
2633 /* Set the default HMAC the peer requested*/
2634 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2637 case SCTP_PARAM_CHUNKS:
2638 if (!sctp_auth_enable)
2641 asoc->peer.peer_chunks = kmemdup(param.p,
2642 ntohs(param.p->length), gfp);
2643 if (!asoc->peer.peer_chunks)
2648 /* Any unrecognized parameters should have been caught
2649 * and handled by sctp_verify_param() which should be
2650 * called prior to this routine. Simply log the error
2653 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2654 ntohs(param.p->type), asoc);
2661 /* Select a new verification tag. */
2662 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2664 /* I believe that this random number generator complies with RFC1750.
2665 * A tag of 0 is reserved for special cases (e.g. INIT).
2670 get_random_bytes(&x, sizeof(__u32));
2676 /* Select an initial TSN to send during startup. */
2677 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2681 get_random_bytes(&retval, sizeof(__u32));
2686 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2688 * 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
2689 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2690 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2691 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2693 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2694 * | Address Parameter |
2695 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2696 * | ASCONF Parameter #1 |
2697 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2701 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2702 * | ASCONF Parameter #N |
2703 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2705 * Address Parameter and other parameter will not be wrapped in this function
2707 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2708 union sctp_addr *addr,
2711 sctp_addiphdr_t asconf;
2712 struct sctp_chunk *retval;
2713 int length = sizeof(asconf) + vparam_len;
2714 union sctp_addr_param addrparam;
2716 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2718 addrlen = af->to_addr_param(addr, &addrparam);
2723 /* Create the chunk. */
2724 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2728 asconf.serial = htonl(asoc->addip_serial++);
2730 retval->subh.addip_hdr =
2731 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2732 retval->param_hdr.v =
2733 sctp_addto_chunk(retval, addrlen, &addrparam);
2739 * 3.2.1 Add IP Address
2741 * 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
2742 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2743 * | Type = 0xC001 | Length = Variable |
2744 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2745 * | ASCONF-Request Correlation ID |
2746 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2747 * | Address Parameter |
2748 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2750 * 3.2.2 Delete IP Address
2752 * 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
2753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2754 * | Type = 0xC002 | Length = Variable |
2755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2756 * | ASCONF-Request Correlation ID |
2757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2758 * | Address Parameter |
2759 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2762 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2763 union sctp_addr *laddr,
2764 struct sockaddr *addrs,
2768 sctp_addip_param_t param;
2769 struct sctp_chunk *retval;
2770 union sctp_addr_param addr_param;
2771 union sctp_addr *addr;
2774 int paramlen = sizeof(param);
2775 int addr_param_len = 0;
2780 /* Get total length of all the address parameters. */
2782 for (i = 0; i < addrcnt; i++) {
2784 af = sctp_get_af_specific(addr->v4.sin_family);
2785 addr_param_len = af->to_addr_param(addr, &addr_param);
2787 totallen += paramlen;
2788 totallen += addr_param_len;
2790 addr_buf += af->sockaddr_len;
2791 if (asoc->asconf_addr_del_pending && !del_pickup) {
2792 /* reuse the parameter length from the same scope one */
2793 totallen += paramlen;
2794 totallen += addr_param_len;
2796 SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen);
2800 /* Create an asconf chunk with the required length. */
2801 retval = sctp_make_asconf(asoc, laddr, totallen);
2805 /* Add the address parameters to the asconf chunk. */
2807 for (i = 0; i < addrcnt; i++) {
2809 af = sctp_get_af_specific(addr->v4.sin_family);
2810 addr_param_len = af->to_addr_param(addr, &addr_param);
2811 param.param_hdr.type = flags;
2812 param.param_hdr.length = htons(paramlen + addr_param_len);
2815 sctp_addto_chunk(retval, paramlen, ¶m);
2816 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2818 addr_buf += af->sockaddr_len;
2820 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2821 addr = asoc->asconf_addr_del_pending;
2822 af = sctp_get_af_specific(addr->v4.sin_family);
2823 addr_param_len = af->to_addr_param(addr, &addr_param);
2824 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2825 param.param_hdr.length = htons(paramlen + addr_param_len);
2828 sctp_addto_chunk(retval, paramlen, ¶m);
2829 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2835 * 3.2.4 Set Primary IP Address
2837 * 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
2838 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2839 * | Type =0xC004 | Length = Variable |
2840 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2841 * | ASCONF-Request Correlation ID |
2842 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2843 * | Address Parameter |
2844 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2846 * Create an ASCONF chunk with Set Primary IP address parameter.
2848 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2849 union sctp_addr *addr)
2851 sctp_addip_param_t param;
2852 struct sctp_chunk *retval;
2853 int len = sizeof(param);
2854 union sctp_addr_param addrparam;
2856 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2858 addrlen = af->to_addr_param(addr, &addrparam);
2863 /* Create the chunk and make asconf header. */
2864 retval = sctp_make_asconf(asoc, addr, len);
2868 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2869 param.param_hdr.length = htons(len);
2872 sctp_addto_chunk(retval, sizeof(param), ¶m);
2873 sctp_addto_chunk(retval, addrlen, &addrparam);
2878 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2880 * 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
2881 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2882 * | Type = 0x80 | Chunk Flags | Chunk Length |
2883 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2885 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2886 * | ASCONF Parameter Response#1 |
2887 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2891 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2892 * | ASCONF Parameter Response#N |
2893 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2895 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2897 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2898 __u32 serial, int vparam_len)
2900 sctp_addiphdr_t asconf;
2901 struct sctp_chunk *retval;
2902 int length = sizeof(asconf) + vparam_len;
2904 /* Create the chunk. */
2905 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2909 asconf.serial = htonl(serial);
2911 retval->subh.addip_hdr =
2912 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2917 /* Add response parameters to an ASCONF_ACK chunk. */
2918 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2919 __be16 err_code, sctp_addip_param_t *asconf_param)
2921 sctp_addip_param_t ack_param;
2922 sctp_errhdr_t err_param;
2923 int asconf_param_len = 0;
2924 int err_param_len = 0;
2925 __be16 response_type;
2927 if (SCTP_ERROR_NO_ERROR == err_code) {
2928 response_type = SCTP_PARAM_SUCCESS_REPORT;
2930 response_type = SCTP_PARAM_ERR_CAUSE;
2931 err_param_len = sizeof(err_param);
2934 ntohs(asconf_param->param_hdr.length);
2937 /* Add Success Indication or Error Cause Indication parameter. */
2938 ack_param.param_hdr.type = response_type;
2939 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2942 ack_param.crr_id = crr_id;
2943 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2945 if (SCTP_ERROR_NO_ERROR == err_code)
2948 /* Add Error Cause parameter. */
2949 err_param.cause = err_code;
2950 err_param.length = htons(err_param_len + asconf_param_len);
2951 sctp_addto_chunk(chunk, err_param_len, &err_param);
2953 /* Add the failed TLV copied from ASCONF chunk. */
2955 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2958 /* Process a asconf parameter. */
2959 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
2960 struct sctp_chunk *asconf,
2961 sctp_addip_param_t *asconf_param)
2963 struct sctp_transport *peer;
2965 union sctp_addr addr;
2966 union sctp_addr_param *addr_param;
2968 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
2970 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
2971 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
2972 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
2973 return SCTP_ERROR_UNKNOWN_PARAM;
2975 switch (addr_param->p.type) {
2976 case SCTP_PARAM_IPV6_ADDRESS:
2977 if (!asoc->peer.ipv6_address)
2978 return SCTP_ERROR_DNS_FAILED;
2980 case SCTP_PARAM_IPV4_ADDRESS:
2981 if (!asoc->peer.ipv4_address)
2982 return SCTP_ERROR_DNS_FAILED;
2985 return SCTP_ERROR_DNS_FAILED;
2988 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2990 return SCTP_ERROR_DNS_FAILED;
2992 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
2994 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
2995 * or multicast address.
2996 * (note: wildcard is permitted and requires special handling so
2997 * make sure we check for that)
2999 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3000 return SCTP_ERROR_DNS_FAILED;
3002 switch (asconf_param->param_hdr.type) {
3003 case SCTP_PARAM_ADD_IP:
3005 * If the address 0.0.0.0 or ::0 is provided, the source
3006 * address of the packet MUST be added.
3008 if (af->is_any(&addr))
3009 memcpy(&addr, &asconf->source, sizeof(addr));
3011 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3012 * request and does not have the local resources to add this
3013 * new address to the association, it MUST return an Error
3014 * Cause TLV set to the new error code 'Operation Refused
3015 * Due to Resource Shortage'.
3018 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3020 return SCTP_ERROR_RSRC_LOW;
3022 /* Start the heartbeat timer. */
3023 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
3024 sctp_transport_hold(peer);
3025 asoc->new_transport = peer;
3027 case SCTP_PARAM_DEL_IP:
3028 /* ADDIP 4.3 D7) If a request is received to delete the
3029 * last remaining IP address of a peer endpoint, the receiver
3030 * MUST send an Error Cause TLV with the error cause set to the
3031 * new error code 'Request to Delete Last Remaining IP Address'.
3033 if (asoc->peer.transport_count == 1)
3034 return SCTP_ERROR_DEL_LAST_IP;
3036 /* ADDIP 4.3 D8) If a request is received to delete an IP
3037 * address which is also the source address of the IP packet
3038 * which contained the ASCONF chunk, the receiver MUST reject
3039 * this request. To reject the request the receiver MUST send
3040 * an Error Cause TLV set to the new error code 'Request to
3041 * Delete Source IP Address'
3043 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3044 return SCTP_ERROR_DEL_SRC_IP;
3047 * If the address 0.0.0.0 or ::0 is provided, all
3048 * addresses of the peer except the source address of the
3049 * packet MUST be deleted.
3051 if (af->is_any(&addr)) {
3052 sctp_assoc_set_primary(asoc, asconf->transport);
3053 sctp_assoc_del_nonprimary_peers(asoc,
3056 sctp_assoc_del_peer(asoc, &addr);
3058 case SCTP_PARAM_SET_PRIMARY:
3059 /* ADDIP Section 4.2.4
3060 * If the address 0.0.0.0 or ::0 is provided, the receiver
3061 * MAY mark the source address of the packet as its
3064 if (af->is_any(&addr))
3065 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3067 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3069 return SCTP_ERROR_DNS_FAILED;
3071 sctp_assoc_set_primary(asoc, peer);
3075 return SCTP_ERROR_NO_ERROR;
3078 /* Verify the ASCONF packet before we process it. */
3079 bool sctp_verify_asconf(const struct sctp_association *asoc,
3080 struct sctp_chunk *chunk, bool addr_param_needed,
3081 struct sctp_paramhdr **errp)
3083 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr;
3084 union sctp_params param;
3085 bool addr_param_seen = false;
3087 sctp_walk_params(param, addip, addip_hdr.params) {
3088 size_t length = ntohs(param.p->length);
3091 switch (param.p->type) {
3092 case SCTP_PARAM_ERR_CAUSE:
3094 case SCTP_PARAM_IPV4_ADDRESS:
3095 if (length != sizeof(sctp_ipv4addr_param_t))
3097 addr_param_seen = true;
3099 case SCTP_PARAM_IPV6_ADDRESS:
3100 if (length != sizeof(sctp_ipv6addr_param_t))
3102 addr_param_seen = true;
3104 case SCTP_PARAM_ADD_IP:
3105 case SCTP_PARAM_DEL_IP:
3106 case SCTP_PARAM_SET_PRIMARY:
3107 /* In ASCONF chunks, these need to be first. */
3108 if (addr_param_needed && !addr_param_seen)
3110 length = ntohs(param.addip->param_hdr.length);
3111 if (length < sizeof(sctp_addip_param_t) +
3112 sizeof(sctp_paramhdr_t))
3115 case SCTP_PARAM_SUCCESS_REPORT:
3116 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3117 if (length != sizeof(sctp_addip_param_t))
3121 /* This is unkown to us, reject! */
3126 /* Remaining sanity checks. */
3127 if (addr_param_needed && !addr_param_seen)
3129 if (!addr_param_needed && addr_param_seen)
3131 if (param.v != chunk->chunk_end)
3137 /* Process an incoming ASCONF chunk with the next expected serial no. and
3138 * return an ASCONF_ACK chunk to be sent in response.
3140 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3141 struct sctp_chunk *asconf)
3143 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr;
3144 bool all_param_pass = true;
3145 union sctp_params param;
3146 sctp_addiphdr_t *hdr;
3147 union sctp_addr_param *addr_param;
3148 sctp_addip_param_t *asconf_param;
3149 struct sctp_chunk *asconf_ack;
3155 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
3156 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3157 serial = ntohl(hdr->serial);
3159 /* Skip the addiphdr and store a pointer to address parameter. */
3160 length = sizeof(sctp_addiphdr_t);
3161 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3162 chunk_len -= length;
3164 /* Skip the address parameter and store a pointer to the first
3167 length = ntohs(addr_param->p.length);
3168 asconf_param = (void *)addr_param + length;
3169 chunk_len -= length;
3171 /* create an ASCONF_ACK chunk.
3172 * Based on the definitions of parameters, we know that the size of
3173 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3176 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3180 /* Process the TLVs contained within the ASCONF chunk. */
3181 sctp_walk_params(param, addip, addip_hdr.params) {
3182 /* Skip preceeding address parameters. */
3183 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3184 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3187 err_code = sctp_process_asconf_param(asoc, asconf,
3190 * If an error response is received for a TLV parameter,
3191 * all TLVs with no response before the failed TLV are
3192 * considered successful if not reported. All TLVs after
3193 * the failed response are considered unsuccessful unless
3194 * a specific success indication is present for the parameter.
3196 if (err_code != SCTP_ERROR_NO_ERROR)
3197 all_param_pass = false;
3198 if (!all_param_pass)
3199 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3200 err_code, param.addip);
3202 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3203 * an IP address sends an 'Out of Resource' in its response, it
3204 * MUST also fail any subsequent add or delete requests bundled
3207 if (err_code == SCTP_ERROR_RSRC_LOW)
3211 asoc->peer.addip_serial++;
3213 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3214 * after freeing the reference to old asconf ack if any.
3217 sctp_chunk_hold(asconf_ack);
3218 list_add_tail(&asconf_ack->transmitted_list,
3219 &asoc->asconf_ack_list);
3225 /* Process a asconf parameter that is successfully acked. */
3226 static void sctp_asconf_param_success(struct sctp_association *asoc,
3227 sctp_addip_param_t *asconf_param)
3230 union sctp_addr addr;
3231 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3232 union sctp_addr_param *addr_param;
3233 struct sctp_transport *transport;
3234 struct sctp_sockaddr_entry *saddr;
3236 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
3238 /* We have checked the packet before, so we do not check again. */
3239 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3240 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
3242 switch (asconf_param->param_hdr.type) {
3243 case SCTP_PARAM_ADD_IP:
3244 /* This is always done in BH context with a socket lock
3245 * held, so the list can not change.
3248 list_for_each_entry(saddr, &bp->address_list, list) {
3249 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3250 saddr->state = SCTP_ADDR_SRC;
3253 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3255 dst_release(transport->dst);
3256 transport->dst = NULL;
3259 case SCTP_PARAM_DEL_IP:
3261 sctp_del_bind_addr(bp, &addr);
3262 if (asoc->asconf_addr_del_pending != NULL &&
3263 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3264 kfree(asoc->asconf_addr_del_pending);
3265 asoc->asconf_addr_del_pending = NULL;
3268 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3270 dst_release(transport->dst);
3271 transport->dst = NULL;
3279 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3280 * for the given asconf parameter. If there is no response for this parameter,
3281 * return the error code based on the third argument 'no_err'.
3283 * A7) If an error response is received for a TLV parameter, all TLVs with no
3284 * response before the failed TLV are considered successful if not reported.
3285 * All TLVs after the failed response are considered unsuccessful unless a
3286 * specific success indication is present for the parameter.
3288 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3289 sctp_addip_param_t *asconf_param,
3292 sctp_addip_param_t *asconf_ack_param;
3293 sctp_errhdr_t *err_param;
3299 err_code = SCTP_ERROR_NO_ERROR;
3301 err_code = SCTP_ERROR_REQ_REFUSED;
3303 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3304 sizeof(sctp_chunkhdr_t);
3306 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3307 * the first asconf_ack parameter.
3309 length = sizeof(sctp_addiphdr_t);
3310 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3312 asconf_ack_len -= length;
3314 while (asconf_ack_len > 0) {
3315 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3316 switch(asconf_ack_param->param_hdr.type) {
3317 case SCTP_PARAM_SUCCESS_REPORT:
3318 return SCTP_ERROR_NO_ERROR;
3319 case SCTP_PARAM_ERR_CAUSE:
3320 length = sizeof(sctp_addip_param_t);
3321 err_param = (void *)asconf_ack_param + length;
3322 asconf_ack_len -= length;
3323 if (asconf_ack_len > 0)
3324 return err_param->cause;
3326 return SCTP_ERROR_INV_PARAM;
3329 return SCTP_ERROR_INV_PARAM;
3333 length = ntohs(asconf_ack_param->param_hdr.length);
3334 asconf_ack_param = (void *)asconf_ack_param + length;
3335 asconf_ack_len -= length;
3341 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3342 int sctp_process_asconf_ack(struct sctp_association *asoc,
3343 struct sctp_chunk *asconf_ack)
3345 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3346 union sctp_addr_param *addr_param;
3347 sctp_addip_param_t *asconf_param;
3349 int asconf_len = asconf->skb->len;
3350 int all_param_pass = 0;
3353 __be16 err_code = SCTP_ERROR_NO_ERROR;
3355 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3356 * a pointer to address parameter.
3358 length = sizeof(sctp_addip_chunk_t);
3359 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3360 asconf_len -= length;
3362 /* Skip the address parameter in the last asconf sent and store a
3363 * pointer to the first asconf parameter.
3365 length = ntohs(addr_param->p.length);
3366 asconf_param = (void *)addr_param + length;
3367 asconf_len -= length;
3370 * A8) If there is no response(s) to specific TLV parameter(s), and no
3371 * failures are indicated, then all request(s) are considered
3374 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3377 /* Process the TLVs contained in the last sent ASCONF chunk. */
3378 while (asconf_len > 0) {
3380 err_code = SCTP_ERROR_NO_ERROR;
3382 err_code = sctp_get_asconf_response(asconf_ack,
3385 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3390 case SCTP_ERROR_NO_ERROR:
3391 sctp_asconf_param_success(asoc, asconf_param);
3394 case SCTP_ERROR_RSRC_LOW:
3398 case SCTP_ERROR_UNKNOWN_PARAM:
3399 /* Disable sending this type of asconf parameter in
3402 asoc->peer.addip_disabled_mask |=
3403 asconf_param->param_hdr.type;
3406 case SCTP_ERROR_REQ_REFUSED:
3407 case SCTP_ERROR_DEL_LAST_IP:
3408 case SCTP_ERROR_DEL_SRC_IP:
3413 /* Skip the processed asconf parameter and move to the next
3416 length = ntohs(asconf_param->param_hdr.length);
3417 asconf_param = (void *)asconf_param + length;
3418 asconf_len -= length;
3421 if (no_err && asoc->src_out_of_asoc_ok)
3422 asoc->src_out_of_asoc_ok = 0;
3424 /* Free the cached last sent asconf chunk. */
3425 list_del_init(&asconf->transmitted_list);
3426 sctp_chunk_free(asconf);
3427 asoc->addip_last_asconf = NULL;
3432 /* Make a FWD TSN chunk. */
3433 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3434 __u32 new_cum_tsn, size_t nstreams,
3435 struct sctp_fwdtsn_skip *skiplist)
3437 struct sctp_chunk *retval = NULL;
3438 struct sctp_fwdtsn_hdr ftsn_hdr;
3439 struct sctp_fwdtsn_skip skip;
3443 hint = (nstreams + 1) * sizeof(__u32);
3445 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3450 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3451 retval->subh.fwdtsn_hdr =
3452 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3454 for (i = 0; i < nstreams; i++) {
3455 skip.stream = skiplist[i].stream;
3456 skip.ssn = skiplist[i].ssn;
3457 sctp_addto_chunk(retval, sizeof(skip), &skip);