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 #include <linux/types.h>
54 #include <linux/kernel.h>
56 #include <linux/ipv6.h>
57 #include <linux/net.h>
58 #include <linux/inet.h>
59 #include <linux/scatterlist.h>
60 #include <linux/crypto.h>
61 #include <linux/slab.h>
64 #include <linux/skbuff.h>
65 #include <linux/random.h> /* for get_random_bytes */
66 #include <net/sctp/sctp.h>
67 #include <net/sctp/sm.h>
70 struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
71 __u8 type, __u8 flags, int paylen);
72 static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
73 const struct sctp_association *asoc,
74 const struct sctp_chunk *init_chunk,
76 const __u8 *raw_addrs, int addrs_len);
77 static int sctp_process_param(struct sctp_association *asoc,
78 union sctp_params param,
79 const union sctp_addr *peer_addr,
81 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
84 /* What was the inbound interface for this chunk? */
85 int sctp_chunk_iif(const struct sctp_chunk *chunk)
90 af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version));
92 iif = af->skb_iif(chunk->skb);
97 /* RFC 2960 3.3.2 Initiation (INIT) (1)
99 * Note 2: The ECN capable field is reserved for future use of
100 * Explicit Congestion Notification.
102 static const struct sctp_paramhdr ecap_param = {
103 SCTP_PARAM_ECN_CAPABLE,
104 cpu_to_be16(sizeof(struct sctp_paramhdr)),
106 static const struct sctp_paramhdr prsctp_param = {
107 SCTP_PARAM_FWD_TSN_SUPPORT,
108 cpu_to_be16(sizeof(struct sctp_paramhdr)),
111 /* A helper to initialize to initialize an op error inside a
112 * provided chunk, as most cause codes will be embedded inside an
115 void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
121 /* Cause code constants are now defined in network order. */
122 err.cause = cause_code;
123 len = sizeof(sctp_errhdr_t) + paylen;
124 err.length = htons(len);
125 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
128 /* 3.3.2 Initiation (INIT) (1)
130 * This chunk is used to initiate a SCTP association between two
131 * endpoints. The format of the INIT chunk is shown below:
134 * 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
135 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
136 * | Type = 1 | Chunk Flags | Chunk Length |
137 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
139 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
140 * | Advertised Receiver Window Credit (a_rwnd) |
141 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
142 * | Number of Outbound Streams | Number of Inbound Streams |
143 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
145 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
147 * / Optional/Variable-Length Parameters /
149 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
152 * The INIT chunk contains the following parameters. Unless otherwise
153 * noted, each parameter MUST only be included once in the INIT chunk.
155 * Fixed Parameters Status
156 * ----------------------------------------------
157 * Initiate Tag Mandatory
158 * Advertised Receiver Window Credit Mandatory
159 * Number of Outbound Streams Mandatory
160 * Number of Inbound Streams Mandatory
161 * Initial TSN Mandatory
163 * Variable Parameters Status Type Value
164 * -------------------------------------------------------------
165 * IPv4 Address (Note 1) Optional 5
166 * IPv6 Address (Note 1) Optional 6
167 * Cookie Preservative Optional 9
168 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
169 * Host Name Address (Note 3) Optional 11
170 * Supported Address Types (Note 4) Optional 12
172 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
173 const struct sctp_bind_addr *bp,
174 gfp_t gfp, int vparam_len)
177 union sctp_params addrs;
179 struct sctp_chunk *retval = NULL;
180 int num_types, addrs_len = 0;
181 struct sctp_sock *sp;
182 sctp_supported_addrs_param_t sat;
184 sctp_adaptation_ind_param_t aiparam;
185 sctp_supported_ext_param_t ext_param;
188 sctp_paramhdr_t *auth_chunks = NULL,
191 /* RFC 2960 3.3.2 Initiation (INIT) (1)
193 * Note 1: The INIT chunks can contain multiple addresses that
194 * can be IPv4 and/or IPv6 in any combination.
198 /* Convert the provided bind address list to raw format. */
199 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
201 init.init_tag = htonl(asoc->c.my_vtag);
202 init.a_rwnd = htonl(asoc->rwnd);
203 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
204 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
205 init.initial_tsn = htonl(asoc->c.initial_tsn);
207 /* How many address types are needed? */
208 sp = sctp_sk(asoc->base.sk);
209 num_types = sp->pf->supported_addrs(sp, types);
211 chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types);
212 chunksize += sizeof(ecap_param);
214 if (sctp_prsctp_enable)
215 chunksize += sizeof(prsctp_param);
217 /* ADDIP: Section 4.2.7:
218 * An implementation supporting this extension [ADDIP] MUST list
219 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
220 * INIT-ACK parameters.
222 if (sctp_addip_enable) {
223 extensions[num_ext] = SCTP_CID_ASCONF;
224 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
228 if (sp->adaptation_ind)
229 chunksize += sizeof(aiparam);
231 chunksize += vparam_len;
233 /* Account for AUTH related parameters */
234 if (sctp_auth_enable) {
235 /* Add random parameter length*/
236 chunksize += sizeof(asoc->c.auth_random);
238 /* Add HMACS parameter length if any were defined */
239 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
240 if (auth_hmacs->length)
241 chunksize += ntohs(auth_hmacs->length);
245 /* Add CHUNKS parameter length */
246 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
247 if (auth_chunks->length)
248 chunksize += ntohs(auth_chunks->length);
252 extensions[num_ext] = SCTP_CID_AUTH;
256 /* If we have any extensions to report, account for that */
258 chunksize += sizeof(sctp_supported_ext_param_t) + num_ext;
260 /* RFC 2960 3.3.2 Initiation (INIT) (1)
262 * Note 3: An INIT chunk MUST NOT contain more than one Host
263 * Name address parameter. Moreover, the sender of the INIT
264 * MUST NOT combine any other address types with the Host Name
265 * address in the INIT. The receiver of INIT MUST ignore any
266 * other address types if the Host Name address parameter is
267 * present in the received INIT chunk.
269 * PLEASE DO NOT FIXME [This version does not support Host Name.]
272 retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
276 retval->subh.init_hdr =
277 sctp_addto_chunk(retval, sizeof(init), &init);
278 retval->param_hdr.v =
279 sctp_addto_chunk(retval, addrs_len, addrs.v);
281 /* RFC 2960 3.3.2 Initiation (INIT) (1)
283 * Note 4: This parameter, when present, specifies all the
284 * address types the sending endpoint can support. The absence
285 * of this parameter indicates that the sending endpoint can
286 * support any address type.
288 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
289 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
290 sctp_addto_chunk(retval, sizeof(sat), &sat);
291 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
293 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
295 /* Add the supported extensions parameter. Be nice and add this
296 * fist before addiding the parameters for the extensions themselves
299 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
300 ext_param.param_hdr.length =
301 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
302 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
304 sctp_addto_param(retval, num_ext, extensions);
307 if (sctp_prsctp_enable)
308 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
310 if (sp->adaptation_ind) {
311 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
312 aiparam.param_hdr.length = htons(sizeof(aiparam));
313 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
314 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
317 /* Add SCTP-AUTH chunks to the parameter list */
318 if (sctp_auth_enable) {
319 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
320 asoc->c.auth_random);
322 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
325 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
333 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
334 const struct sctp_chunk *chunk,
335 gfp_t gfp, int unkparam_len)
337 sctp_inithdr_t initack;
338 struct sctp_chunk *retval;
339 union sctp_params addrs;
340 struct sctp_sock *sp;
342 sctp_cookie_param_t *cookie;
345 sctp_adaptation_ind_param_t aiparam;
346 sctp_supported_ext_param_t ext_param;
349 sctp_paramhdr_t *auth_chunks = NULL,
355 /* Note: there may be no addresses to embed. */
356 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
358 initack.init_tag = htonl(asoc->c.my_vtag);
359 initack.a_rwnd = htonl(asoc->rwnd);
360 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
361 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
362 initack.initial_tsn = htonl(asoc->c.initial_tsn);
364 /* FIXME: We really ought to build the cookie right
365 * into the packet instead of allocating more fresh memory.
367 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
372 /* Calculate the total size of allocation, include the reserved
373 * space for reporting unknown parameters if it is specified.
375 sp = sctp_sk(asoc->base.sk);
376 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
378 /* Tell peer that we'll do ECN only if peer advertised such cap. */
379 if (asoc->peer.ecn_capable)
380 chunksize += sizeof(ecap_param);
382 if (asoc->peer.prsctp_capable)
383 chunksize += sizeof(prsctp_param);
385 if (asoc->peer.asconf_capable) {
386 extensions[num_ext] = SCTP_CID_ASCONF;
387 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
391 if (sp->adaptation_ind)
392 chunksize += sizeof(aiparam);
394 if (asoc->peer.auth_capable) {
395 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
396 chunksize += ntohs(auth_random->length);
398 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
399 if (auth_hmacs->length)
400 chunksize += ntohs(auth_hmacs->length);
404 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
405 if (auth_chunks->length)
406 chunksize += ntohs(auth_chunks->length);
410 extensions[num_ext] = SCTP_CID_AUTH;
415 chunksize += sizeof(sctp_supported_ext_param_t) + num_ext;
417 /* Now allocate and fill out the chunk. */
418 retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
422 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
424 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
425 * HEARTBEAT ACK, * etc.) to the same destination transport
426 * address from which it received the DATA or control chunk
427 * to which it is replying.
429 * [INIT ACK back to where the INIT came from.]
431 retval->transport = chunk->transport;
433 retval->subh.init_hdr =
434 sctp_addto_chunk(retval, sizeof(initack), &initack);
435 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
436 sctp_addto_chunk(retval, cookie_len, cookie);
437 if (asoc->peer.ecn_capable)
438 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
440 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
441 ext_param.param_hdr.length =
442 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
443 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
445 sctp_addto_param(retval, num_ext, extensions);
447 if (asoc->peer.prsctp_capable)
448 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
450 if (sp->adaptation_ind) {
451 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
452 aiparam.param_hdr.length = htons(sizeof(aiparam));
453 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
454 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
457 if (asoc->peer.auth_capable) {
458 sctp_addto_chunk(retval, ntohs(auth_random->length),
461 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
464 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
468 /* We need to remove the const qualifier at this point. */
469 retval->asoc = (struct sctp_association *) asoc;
478 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
480 * This chunk is used only during the initialization of an association.
481 * It is sent by the initiator of an association to its peer to complete
482 * the initialization process. This chunk MUST precede any DATA chunk
483 * sent within the association, but MAY be bundled with one or more DATA
484 * chunks in the same packet.
487 * 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
488 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
489 * | Type = 10 |Chunk Flags | Length |
490 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
493 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
497 * Set to zero on transmit and ignored on receipt.
499 * Length: 16 bits (unsigned integer)
501 * Set to the size of the chunk in bytes, including the 4 bytes of
502 * the chunk header and the size of the Cookie.
504 * Cookie: variable size
506 * This field must contain the exact cookie received in the
507 * State Cookie parameter from the previous INIT ACK.
509 * An implementation SHOULD make the cookie as small as possible
510 * to insure interoperability.
512 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
513 const struct sctp_chunk *chunk)
515 struct sctp_chunk *retval;
519 cookie = asoc->peer.cookie;
520 cookie_len = asoc->peer.cookie_len;
522 /* Build a cookie echo chunk. */
523 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
526 retval->subh.cookie_hdr =
527 sctp_addto_chunk(retval, cookie_len, cookie);
529 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
531 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
532 * HEARTBEAT ACK, * etc.) to the same destination transport
533 * address from which it * received the DATA or control chunk
534 * to which it is replying.
536 * [COOKIE ECHO back to where the INIT ACK came from.]
539 retval->transport = chunk->transport;
545 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
547 * This chunk is used only during the initialization of an
548 * association. It is used to acknowledge the receipt of a COOKIE
549 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
550 * within the association, but MAY be bundled with one or more DATA
551 * chunks or SACK chunk in the same SCTP packet.
554 * 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
555 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
556 * | Type = 11 |Chunk Flags | Length = 4 |
557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
559 * Chunk Flags: 8 bits
561 * Set to zero on transmit and ignored on receipt.
563 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
564 const struct sctp_chunk *chunk)
566 struct sctp_chunk *retval;
568 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
570 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
572 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
573 * HEARTBEAT ACK, * etc.) to the same destination transport
574 * address from which it * received the DATA or control chunk
575 * to which it is replying.
577 * [COOKIE ACK back to where the COOKIE ECHO came from.]
580 retval->transport = chunk->transport;
586 * Appendix A: Explicit Congestion Notification:
589 * RFC 2481 details a specific bit for a sender to send in the header of
590 * its next outbound TCP segment to indicate to its peer that it has
591 * reduced its congestion window. This is termed the CWR bit. For
592 * SCTP the same indication is made by including the CWR chunk.
593 * This chunk contains one data element, i.e. the TSN number that
594 * was sent in the ECNE chunk. This element represents the lowest
595 * TSN number in the datagram that was originally marked with the
599 * 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
600 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
601 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
602 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
603 * | Lowest TSN Number |
604 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
606 * Note: The CWR is considered a Control chunk.
608 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
609 const __u32 lowest_tsn,
610 const struct sctp_chunk *chunk)
612 struct sctp_chunk *retval;
615 cwr.lowest_tsn = htonl(lowest_tsn);
616 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
617 sizeof(sctp_cwrhdr_t));
622 retval->subh.ecn_cwr_hdr =
623 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
625 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
627 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
628 * HEARTBEAT ACK, * etc.) to the same destination transport
629 * address from which it * received the DATA or control chunk
630 * to which it is replying.
632 * [Report a reduced congestion window back to where the ECNE
636 retval->transport = chunk->transport;
642 /* Make an ECNE chunk. This is a congestion experienced report. */
643 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
644 const __u32 lowest_tsn)
646 struct sctp_chunk *retval;
649 ecne.lowest_tsn = htonl(lowest_tsn);
650 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
651 sizeof(sctp_ecnehdr_t));
654 retval->subh.ecne_hdr =
655 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
661 /* Make a DATA chunk for the given association from the provided
662 * parameters. However, do not populate the data payload.
664 struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
665 const struct sctp_sndrcvinfo *sinfo,
666 int data_len, __u8 flags, __u16 ssn)
668 struct sctp_chunk *retval;
669 struct sctp_datahdr dp;
672 /* We assign the TSN as LATE as possible, not here when
673 * creating the chunk.
676 dp.stream = htons(sinfo->sinfo_stream);
677 dp.ppid = sinfo->sinfo_ppid;
679 /* Set the flags for an unordered send. */
680 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
681 flags |= SCTP_DATA_UNORDERED;
686 chunk_len = sizeof(dp) + data_len;
687 retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
691 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
692 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
698 /* Create a selective ackowledgement (SACK) for the given
699 * association. This reports on which TSN's we've seen to date,
700 * including duplicates and gaps.
702 struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
704 struct sctp_chunk *retval;
705 struct sctp_sackhdr sack;
708 __u16 num_gabs, num_dup_tsns;
709 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
710 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
712 memset(gabs, 0, sizeof(gabs));
713 ctsn = sctp_tsnmap_get_ctsn(map);
714 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
716 /* How much room is needed in the chunk? */
717 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
718 num_dup_tsns = sctp_tsnmap_num_dups(map);
720 /* Initialize the SACK header. */
721 sack.cum_tsn_ack = htonl(ctsn);
722 sack.a_rwnd = htonl(asoc->a_rwnd);
723 sack.num_gap_ack_blocks = htons(num_gabs);
724 sack.num_dup_tsns = htons(num_dup_tsns);
727 + sizeof(struct sctp_gap_ack_block) * num_gabs
728 + sizeof(__u32) * num_dup_tsns;
730 /* Create the chunk. */
731 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
735 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
737 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
738 * HEARTBEAT ACK, etc.) to the same destination transport
739 * address from which it received the DATA or control chunk to
740 * which it is replying. This rule should also be followed if
741 * the endpoint is bundling DATA chunks together with the
744 * However, when acknowledging multiple DATA chunks received
745 * in packets from different source addresses in a single
746 * SACK, the SACK chunk may be transmitted to one of the
747 * destination transport addresses from which the DATA or
748 * control chunks being acknowledged were received.
750 * [BUG: We do not implement the following paragraph.
751 * Perhaps we should remember the last transport we used for a
752 * SACK and avoid that (if possible) if we have seen any
753 * duplicates. --piggy]
755 * When a receiver of a duplicate DATA chunk sends a SACK to a
756 * multi- homed endpoint it MAY be beneficial to vary the
757 * destination address and not use the source address of the
758 * DATA chunk. The reason being that receiving a duplicate
759 * from a multi-homed endpoint might indicate that the return
760 * path (as specified in the source address of the DATA chunk)
761 * for the SACK is broken.
763 * [Send to the address from which we last received a DATA chunk.]
765 retval->transport = asoc->peer.last_data_from;
767 retval->subh.sack_hdr =
768 sctp_addto_chunk(retval, sizeof(sack), &sack);
770 /* Add the gap ack block information. */
772 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
775 /* Add the duplicate TSN information. */
777 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
778 sctp_tsnmap_get_dups(map));
784 /* Make a SHUTDOWN chunk. */
785 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
786 const struct sctp_chunk *chunk)
788 struct sctp_chunk *retval;
789 sctp_shutdownhdr_t shut;
792 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
793 shut.cum_tsn_ack = htonl(ctsn);
795 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
796 sizeof(sctp_shutdownhdr_t));
800 retval->subh.shutdown_hdr =
801 sctp_addto_chunk(retval, sizeof(shut), &shut);
804 retval->transport = chunk->transport;
809 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
810 const struct sctp_chunk *chunk)
812 struct sctp_chunk *retval;
814 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
816 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
818 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
819 * HEARTBEAT ACK, * etc.) to the same destination transport
820 * address from which it * received the DATA or control chunk
821 * to which it is replying.
823 * [ACK back to where the SHUTDOWN came from.]
826 retval->transport = chunk->transport;
831 struct sctp_chunk *sctp_make_shutdown_complete(
832 const struct sctp_association *asoc,
833 const struct sctp_chunk *chunk)
835 struct sctp_chunk *retval;
838 /* Set the T-bit if we have no association (vtag will be
841 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
843 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
845 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
847 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
848 * HEARTBEAT ACK, * etc.) to the same destination transport
849 * address from which it * received the DATA or control chunk
850 * to which it is replying.
852 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
856 retval->transport = chunk->transport;
861 /* Create an ABORT. Note that we set the T bit if we have no
862 * association, except when responding to an INIT (sctpimpguide 2.41).
864 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
865 const struct sctp_chunk *chunk,
868 struct sctp_chunk *retval;
871 /* Set the T-bit if we have no association and 'chunk' is not
872 * an INIT (vtag will be reflected).
875 if (chunk && chunk->chunk_hdr &&
876 chunk->chunk_hdr->type == SCTP_CID_INIT)
879 flags = SCTP_CHUNK_FLAG_T;
882 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
884 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
886 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
887 * HEARTBEAT ACK, * etc.) to the same destination transport
888 * address from which it * received the DATA or control chunk
889 * to which it is replying.
891 * [ABORT back to where the offender came from.]
894 retval->transport = chunk->transport;
899 /* Helper to create ABORT with a NO_USER_DATA error. */
900 struct sctp_chunk *sctp_make_abort_no_data(
901 const struct sctp_association *asoc,
902 const struct sctp_chunk *chunk, __u32 tsn)
904 struct sctp_chunk *retval;
907 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
913 /* Put the tsn back into network byte order. */
914 payload = htonl(tsn);
915 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
916 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
918 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
920 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
921 * HEARTBEAT ACK, * etc.) to the same destination transport
922 * address from which it * received the DATA or control chunk
923 * to which it is replying.
925 * [ABORT back to where the offender came from.]
928 retval->transport = chunk->transport;
934 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
935 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
936 const struct msghdr *msg,
939 struct sctp_chunk *retval;
940 void *payload = NULL;
943 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
948 /* Put the msg_iov together into payload. */
949 payload = kmalloc(paylen, GFP_KERNEL);
953 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
958 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
959 sctp_addto_chunk(retval, paylen, payload);
969 sctp_chunk_free(retval);
975 /* Append bytes to the end of a parameter. Will panic if chunk is not big
978 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
982 int chunklen = ntohs(chunk->chunk_hdr->length);
984 target = skb_put(chunk->skb, len);
987 memcpy(target, data, len);
989 memset(target, 0, len);
991 /* Adjust the chunk length field. */
992 chunk->chunk_hdr->length = htons(chunklen + len);
993 chunk->chunk_end = skb_tail_pointer(chunk->skb);
998 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
999 struct sctp_chunk *sctp_make_abort_violation(
1000 const struct sctp_association *asoc,
1001 const struct sctp_chunk *chunk,
1002 const __u8 *payload,
1003 const size_t paylen)
1005 struct sctp_chunk *retval;
1006 struct sctp_paramhdr phdr;
1008 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
1009 + sizeof(sctp_paramhdr_t));
1013 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1014 + sizeof(sctp_paramhdr_t));
1016 phdr.type = htons(chunk->chunk_hdr->type);
1017 phdr.length = chunk->chunk_hdr->length;
1018 sctp_addto_chunk(retval, paylen, payload);
1019 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1025 struct sctp_chunk *sctp_make_violation_paramlen(
1026 const struct sctp_association *asoc,
1027 const struct sctp_chunk *chunk,
1028 struct sctp_paramhdr *param)
1030 struct sctp_chunk *retval;
1031 static const char error[] = "The following parameter had invalid length:";
1032 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1033 sizeof(sctp_paramhdr_t);
1035 retval = sctp_make_abort(asoc, chunk, payload_len);
1039 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1040 sizeof(error) + sizeof(sctp_paramhdr_t));
1041 sctp_addto_chunk(retval, sizeof(error), error);
1042 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1048 /* Make a HEARTBEAT chunk. */
1049 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1050 const struct sctp_transport *transport,
1051 const void *payload, const size_t paylen)
1053 struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT,
1059 /* Cast away the 'const', as this is just telling the chunk
1060 * what transport it belongs to.
1062 retval->transport = (struct sctp_transport *) transport;
1063 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1069 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1070 const struct sctp_chunk *chunk,
1071 const void *payload, const size_t paylen)
1073 struct sctp_chunk *retval;
1075 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1079 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1081 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1083 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1084 * HEARTBEAT ACK, * etc.) to the same destination transport
1085 * address from which it * received the DATA or control chunk
1086 * to which it is replying.
1088 * [HBACK back to where the HEARTBEAT came from.]
1091 retval->transport = chunk->transport;
1097 /* Create an Operation Error chunk with the specified space reserved.
1098 * This routine can be used for containing multiple causes in the chunk.
1100 static struct sctp_chunk *sctp_make_op_error_space(
1101 const struct sctp_association *asoc,
1102 const struct sctp_chunk *chunk,
1105 struct sctp_chunk *retval;
1107 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1108 sizeof(sctp_errhdr_t) + size);
1112 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1114 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1115 * HEARTBEAT ACK, etc.) to the same destination transport
1116 * address from which it received the DATA or control chunk
1117 * to which it is replying.
1121 retval->transport = chunk->transport;
1127 /* Create an Operation Error chunk. */
1128 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1129 const struct sctp_chunk *chunk,
1130 __be16 cause_code, const void *payload,
1131 size_t paylen, size_t reserve_tail)
1133 struct sctp_chunk *retval;
1135 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1139 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1140 sctp_addto_chunk(retval, paylen, payload);
1142 sctp_addto_param(retval, reserve_tail, NULL);
1148 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1150 struct sctp_chunk *retval;
1151 struct sctp_hmac *hmac_desc;
1152 struct sctp_authhdr auth_hdr;
1155 /* Get the first hmac that the peer told us to use */
1156 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1157 if (unlikely(!hmac_desc))
1160 retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0,
1161 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1165 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1166 auth_hdr.shkey_id = htons(asoc->active_key_id);
1168 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1171 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1172 memset(hmac, 0, hmac_desc->hmac_len);
1174 /* Adjust the chunk header to include the empty MAC */
1175 retval->chunk_hdr->length =
1176 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1177 retval->chunk_end = skb_tail_pointer(retval->skb);
1183 /********************************************************************
1184 * 2nd Level Abstractions
1185 ********************************************************************/
1187 /* Turn an skb into a chunk.
1188 * FIXME: Eventually move the structure directly inside the skb->cb[].
1190 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1191 const struct sctp_association *asoc,
1194 struct sctp_chunk *retval;
1196 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
1202 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
1205 INIT_LIST_HEAD(&retval->list);
1207 retval->asoc = (struct sctp_association *)asoc;
1209 retval->has_tsn = 0;
1210 retval->has_ssn = 0;
1211 retval->rtt_in_progress = 0;
1212 retval->sent_at = 0;
1213 retval->singleton = 1;
1214 retval->end_of_packet = 0;
1215 retval->ecn_ce_done = 0;
1216 retval->pdiscard = 0;
1218 /* sctpimpguide-05.txt Section 2.8.2
1219 * M1) Each time a new DATA chunk is transmitted
1220 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1221 * 'TSN.Missing.Report' count will be used to determine missing chunks
1222 * and when to fast retransmit.
1224 retval->tsn_missing_report = 0;
1225 retval->tsn_gap_acked = 0;
1226 retval->fast_retransmit = SCTP_CAN_FRTX;
1228 /* If this is a fragmented message, track all fragments
1229 * of the message (for SEND_FAILED).
1233 /* Polish the bead hole. */
1234 INIT_LIST_HEAD(&retval->transmitted_list);
1235 INIT_LIST_HEAD(&retval->frag_list);
1236 SCTP_DBG_OBJCNT_INC(chunk);
1237 atomic_set(&retval->refcnt, 1);
1243 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1244 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1245 union sctp_addr *dest)
1247 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1248 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1251 /* Extract the source address from a chunk. */
1252 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1254 /* If we have a known transport, use that. */
1255 if (chunk->transport) {
1256 return &chunk->transport->ipaddr;
1258 /* Otherwise, extract it from the IP header. */
1259 return &chunk->source;
1263 /* Create a new chunk, setting the type and flags headers from the
1264 * arguments, reserving enough space for a 'paylen' byte payload.
1267 struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1268 __u8 type, __u8 flags, int paylen)
1270 struct sctp_chunk *retval;
1271 sctp_chunkhdr_t *chunk_hdr;
1272 struct sk_buff *skb;
1275 /* No need to allocate LL here, as this is only a chunk. */
1276 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1281 /* Make room for the chunk header. */
1282 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1283 chunk_hdr->type = type;
1284 chunk_hdr->flags = flags;
1285 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1287 sk = asoc ? asoc->base.sk : NULL;
1288 retval = sctp_chunkify(skb, asoc, sk);
1294 retval->chunk_hdr = chunk_hdr;
1295 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1297 /* Determine if the chunk needs to be authenticated */
1298 if (sctp_auth_send_cid(type, asoc))
1301 /* Set the skb to the belonging sock for accounting. */
1310 /* Release the memory occupied by a chunk. */
1311 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1313 BUG_ON(!list_empty(&chunk->list));
1314 list_del_init(&chunk->transmitted_list);
1316 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1317 dev_kfree_skb(chunk->skb);
1319 SCTP_DBG_OBJCNT_DEC(chunk);
1320 kmem_cache_free(sctp_chunk_cachep, chunk);
1323 /* Possibly, free the chunk. */
1324 void sctp_chunk_free(struct sctp_chunk *chunk)
1326 /* Release our reference on the message tracker. */
1328 sctp_datamsg_put(chunk->msg);
1330 sctp_chunk_put(chunk);
1333 /* Grab a reference to the chunk. */
1334 void sctp_chunk_hold(struct sctp_chunk *ch)
1336 atomic_inc(&ch->refcnt);
1339 /* Release a reference to the chunk. */
1340 void sctp_chunk_put(struct sctp_chunk *ch)
1342 if (atomic_dec_and_test(&ch->refcnt))
1343 sctp_chunk_destroy(ch);
1346 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1349 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1353 int chunklen = ntohs(chunk->chunk_hdr->length);
1354 int padlen = WORD_ROUND(chunklen) - chunklen;
1356 padding = skb_put(chunk->skb, padlen);
1357 target = skb_put(chunk->skb, len);
1359 memset(padding, 0, padlen);
1360 memcpy(target, data, len);
1362 /* Adjust the chunk length field. */
1363 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1364 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1369 /* Append bytes from user space to the end of a chunk. Will panic if
1370 * chunk is not big enough.
1371 * Returns a kernel err value.
1373 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1379 /* Make room in chunk for data. */
1380 target = skb_put(chunk->skb, len);
1382 /* Copy data (whole iovec) into chunk */
1383 if ((err = memcpy_fromiovecend(target, data, off, len)))
1386 /* Adjust the chunk length field. */
1387 chunk->chunk_hdr->length =
1388 htons(ntohs(chunk->chunk_hdr->length) + len);
1389 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1395 /* Helper function to assign a TSN if needed. This assumes that both
1396 * the data_hdr and association have already been assigned.
1398 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1400 struct sctp_datamsg *msg;
1401 struct sctp_chunk *lchunk;
1402 struct sctp_stream *stream;
1409 /* All fragments will be on the same stream */
1410 sid = ntohs(chunk->subh.data_hdr->stream);
1411 stream = &chunk->asoc->ssnmap->out;
1413 /* Now assign the sequence number to the entire message.
1414 * All fragments must have the same stream sequence number.
1417 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1418 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1421 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1422 ssn = sctp_ssn_next(stream, sid);
1424 ssn = sctp_ssn_peek(stream, sid);
1427 lchunk->subh.data_hdr->ssn = htons(ssn);
1428 lchunk->has_ssn = 1;
1432 /* Helper function to assign a TSN if needed. This assumes that both
1433 * the data_hdr and association have already been assigned.
1435 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1437 if (!chunk->has_tsn) {
1438 /* This is the last possible instant to
1441 chunk->subh.data_hdr->tsn =
1442 htonl(sctp_association_get_next_tsn(chunk->asoc));
1447 /* Create a CLOSED association to use with an incoming packet. */
1448 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1449 struct sctp_chunk *chunk,
1452 struct sctp_association *asoc;
1453 struct sk_buff *skb;
1457 /* Create the bare association. */
1458 scope = sctp_scope(sctp_source(chunk));
1459 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1464 /* Create an entry for the source address of the packet. */
1465 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
1468 af->from_skb(&asoc->c.peer_addr, skb, 1);
1473 sctp_association_free(asoc);
1477 /* Build a cookie representing asoc.
1478 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1480 static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1481 const struct sctp_association *asoc,
1482 const struct sctp_chunk *init_chunk,
1484 const __u8 *raw_addrs, int addrs_len)
1486 sctp_cookie_param_t *retval;
1487 struct sctp_signed_cookie *cookie;
1488 struct scatterlist sg;
1489 int headersize, bodysize;
1490 unsigned int keylen;
1493 /* Header size is static data prior to the actual cookie, including
1496 headersize = sizeof(sctp_paramhdr_t) +
1497 (sizeof(struct sctp_signed_cookie) -
1498 sizeof(struct sctp_cookie));
1499 bodysize = sizeof(struct sctp_cookie)
1500 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1502 /* Pad out the cookie to a multiple to make the signature
1503 * functions simpler to write.
1505 if (bodysize % SCTP_COOKIE_MULTIPLE)
1506 bodysize += SCTP_COOKIE_MULTIPLE
1507 - (bodysize % SCTP_COOKIE_MULTIPLE);
1508 *cookie_len = headersize + bodysize;
1510 /* Clear this memory since we are sending this data structure
1511 * out on the network.
1513 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1517 cookie = (struct sctp_signed_cookie *) retval->body;
1519 /* Set up the parameter header. */
1520 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1521 retval->p.length = htons(*cookie_len);
1523 /* Copy the cookie part of the association itself. */
1524 cookie->c = asoc->c;
1525 /* Save the raw address list length in the cookie. */
1526 cookie->c.raw_addr_list_len = addrs_len;
1528 /* Remember PR-SCTP capability. */
1529 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1531 /* Save adaptation indication in the cookie. */
1532 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1534 /* Set an expiration time for the cookie. */
1535 do_gettimeofday(&cookie->c.expiration);
1536 TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
1538 /* Copy the peer's init packet. */
1539 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1540 ntohs(init_chunk->chunk_hdr->length));
1542 /* Copy the raw local address list of the association. */
1543 memcpy((__u8 *)&cookie->c.peer_init[0] +
1544 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1546 if (sctp_sk(ep->base.sk)->hmac) {
1547 struct hash_desc desc;
1549 /* Sign the message. */
1550 sg_init_one(&sg, &cookie->c, bodysize);
1551 keylen = SCTP_SECRET_SIZE;
1552 key = (char *)ep->secret_key[ep->current_key];
1553 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1556 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1557 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1570 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1571 struct sctp_association *sctp_unpack_cookie(
1572 const struct sctp_endpoint *ep,
1573 const struct sctp_association *asoc,
1574 struct sctp_chunk *chunk, gfp_t gfp,
1575 int *error, struct sctp_chunk **errp)
1577 struct sctp_association *retval = NULL;
1578 struct sctp_signed_cookie *cookie;
1579 struct sctp_cookie *bear_cookie;
1580 int headersize, bodysize, fixed_size;
1581 __u8 *digest = ep->digest;
1582 struct scatterlist sg;
1583 unsigned int keylen, len;
1586 struct sk_buff *skb = chunk->skb;
1588 struct hash_desc desc;
1590 /* Header size is static data prior to the actual cookie, including
1593 headersize = sizeof(sctp_chunkhdr_t) +
1594 (sizeof(struct sctp_signed_cookie) -
1595 sizeof(struct sctp_cookie));
1596 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1597 fixed_size = headersize + sizeof(struct sctp_cookie);
1599 /* Verify that the chunk looks like it even has a cookie.
1600 * There must be enough room for our cookie and our peer's
1603 len = ntohs(chunk->chunk_hdr->length);
1604 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1607 /* Verify that the cookie has been padded out. */
1608 if (bodysize % SCTP_COOKIE_MULTIPLE)
1611 /* Process the cookie. */
1612 cookie = chunk->subh.cookie_hdr;
1613 bear_cookie = &cookie->c;
1615 if (!sctp_sk(ep->base.sk)->hmac)
1618 /* Check the signature. */
1619 keylen = SCTP_SECRET_SIZE;
1620 sg_init_one(&sg, bear_cookie, bodysize);
1621 key = (char *)ep->secret_key[ep->current_key];
1622 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1625 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1626 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1627 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1628 *error = -SCTP_IERROR_NOMEM;
1632 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1633 /* Try the previous key. */
1634 key = (char *)ep->secret_key[ep->last_key];
1635 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1636 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1637 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1638 *error = -SCTP_IERROR_NOMEM;
1642 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1643 /* Yikes! Still bad signature! */
1644 *error = -SCTP_IERROR_BAD_SIG;
1650 /* IG Section 2.35.2:
1651 * 3) Compare the port numbers and the verification tag contained
1652 * within the COOKIE ECHO chunk to the actual port numbers and the
1653 * verification tag within the SCTP common header of the received
1654 * packet. If these values do not match the packet MUST be silently
1657 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1658 *error = -SCTP_IERROR_BAD_TAG;
1662 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1663 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1664 *error = -SCTP_IERROR_BAD_PORTS;
1668 /* Check to see if the cookie is stale. If there is already
1669 * an association, there is no need to check cookie's expiration
1670 * for init collision case of lost COOKIE ACK.
1671 * If skb has been timestamped, then use the stamp, otherwise
1672 * use current time. This introduces a small possibility that
1673 * that a cookie may be considered expired, but his would only slow
1674 * down the new association establishment instead of every packet.
1676 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1677 skb_get_timestamp(skb, &tv);
1679 do_gettimeofday(&tv);
1681 if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
1683 * Section 3.3.10.3 Stale Cookie Error (3)
1687 * Stale Cookie Error: Indicates the receipt of a valid State
1688 * Cookie that has expired.
1690 len = ntohs(chunk->chunk_hdr->length);
1691 *errp = sctp_make_op_error_space(asoc, chunk, len);
1693 suseconds_t usecs = (tv.tv_sec -
1694 bear_cookie->expiration.tv_sec) * 1000000L +
1695 tv.tv_usec - bear_cookie->expiration.tv_usec;
1696 __be32 n = htonl(usecs);
1698 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
1700 sctp_addto_chunk(*errp, sizeof(n), &n);
1701 *error = -SCTP_IERROR_STALE_COOKIE;
1703 *error = -SCTP_IERROR_NOMEM;
1708 /* Make a new base association. */
1709 scope = sctp_scope(sctp_source(chunk));
1710 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1712 *error = -SCTP_IERROR_NOMEM;
1716 /* Set up our peer's port number. */
1717 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1719 /* Populate the association from the cookie. */
1720 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1722 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1724 *error = -SCTP_IERROR_NOMEM;
1728 /* Also, add the destination address. */
1729 if (list_empty(&retval->base.bind_addr.address_list)) {
1730 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1731 SCTP_ADDR_SRC, GFP_ATOMIC);
1734 retval->next_tsn = retval->c.initial_tsn;
1735 retval->ctsn_ack_point = retval->next_tsn - 1;
1736 retval->addip_serial = retval->c.initial_tsn;
1737 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1738 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1739 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1741 /* The INIT stuff will be done by the side effects. */
1746 sctp_association_free(retval);
1751 /* Yikes! The packet is either corrupt or deliberately
1754 *error = -SCTP_IERROR_MALFORMED;
1758 /********************************************************************
1759 * 3rd Level Abstractions
1760 ********************************************************************/
1762 struct __sctp_missing {
1765 } __attribute__((packed));
1768 * Report a missing mandatory parameter.
1770 static int sctp_process_missing_param(const struct sctp_association *asoc,
1771 sctp_param_t paramtype,
1772 struct sctp_chunk *chunk,
1773 struct sctp_chunk **errp)
1775 struct __sctp_missing report;
1778 len = WORD_ROUND(sizeof(report));
1780 /* Make an ERROR chunk, preparing enough room for
1781 * returning multiple unknown parameters.
1784 *errp = sctp_make_op_error_space(asoc, chunk, len);
1787 report.num_missing = htonl(1);
1788 report.type = paramtype;
1789 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1791 sctp_addto_chunk(*errp, sizeof(report), &report);
1794 /* Stop processing this chunk. */
1798 /* Report an Invalid Mandatory Parameter. */
1799 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1800 struct sctp_chunk *chunk,
1801 struct sctp_chunk **errp)
1803 /* Invalid Mandatory Parameter Error has no payload. */
1806 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1809 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1811 /* Stop processing this chunk. */
1815 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1816 struct sctp_paramhdr *param,
1817 const struct sctp_chunk *chunk,
1818 struct sctp_chunk **errp)
1820 /* This is a fatal error. Any accumulated non-fatal errors are
1824 sctp_chunk_free(*errp);
1826 /* Create an error chunk and fill it in with our payload. */
1827 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1833 /* Do not attempt to handle the HOST_NAME parm. However, do
1834 * send back an indicator to the peer.
1836 static int sctp_process_hn_param(const struct sctp_association *asoc,
1837 union sctp_params param,
1838 struct sctp_chunk *chunk,
1839 struct sctp_chunk **errp)
1841 __u16 len = ntohs(param.p->length);
1843 /* Processing of the HOST_NAME parameter will generate an
1844 * ABORT. If we've accumulated any non-fatal errors, they
1845 * would be unrecognized parameters and we should not include
1846 * them in the ABORT.
1849 sctp_chunk_free(*errp);
1851 *errp = sctp_make_op_error_space(asoc, chunk, len);
1854 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1855 sctp_addto_chunk(*errp, len, param.v);
1858 /* Stop processing this chunk. */
1862 static int sctp_verify_ext_param(union sctp_params param)
1864 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1866 int have_asconf = 0;
1869 for (i = 0; i < num_ext; i++) {
1870 switch (param.ext->chunks[i]) {
1874 case SCTP_CID_ASCONF:
1875 case SCTP_CID_ASCONF_ACK:
1881 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1882 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1883 * only if ADD-IP is turned on and we are not backward-compatible
1886 if (sctp_addip_noauth)
1889 if (sctp_addip_enable && !have_auth && have_asconf)
1895 static void sctp_process_ext_param(struct sctp_association *asoc,
1896 union sctp_params param)
1898 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1901 for (i = 0; i < num_ext; i++) {
1902 switch (param.ext->chunks[i]) {
1903 case SCTP_CID_FWD_TSN:
1904 if (sctp_prsctp_enable &&
1905 !asoc->peer.prsctp_capable)
1906 asoc->peer.prsctp_capable = 1;
1909 /* if the peer reports AUTH, assume that he
1912 if (sctp_auth_enable)
1913 asoc->peer.auth_capable = 1;
1915 case SCTP_CID_ASCONF:
1916 case SCTP_CID_ASCONF_ACK:
1917 if (sctp_addip_enable)
1918 asoc->peer.asconf_capable = 1;
1926 /* RFC 3.2.1 & the Implementers Guide 2.2.
1928 * The Parameter Types are encoded such that the
1929 * highest-order two bits specify the action that must be
1930 * taken if the processing endpoint does not recognize the
1933 * 00 - Stop processing this parameter; do not process any further
1934 * parameters within this chunk
1936 * 01 - Stop processing this parameter, do not process any further
1937 * parameters within this chunk, and report the unrecognized
1938 * parameter in an 'Unrecognized Parameter' ERROR chunk.
1940 * 10 - Skip this parameter and continue processing.
1942 * 11 - Skip this parameter and continue processing but
1943 * report the unrecognized parameter in an
1944 * 'Unrecognized Parameter' ERROR chunk.
1947 * SCTP_IERROR_NO_ERROR - continue with the chunk
1948 * SCTP_IERROR_ERROR - stop and report an error.
1949 * SCTP_IERROR_NOMEME - out of memory.
1951 static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
1952 union sctp_params param,
1953 struct sctp_chunk *chunk,
1954 struct sctp_chunk **errp)
1956 int retval = SCTP_IERROR_NO_ERROR;
1958 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
1959 case SCTP_PARAM_ACTION_DISCARD:
1960 retval = SCTP_IERROR_ERROR;
1962 case SCTP_PARAM_ACTION_SKIP:
1964 case SCTP_PARAM_ACTION_DISCARD_ERR:
1965 retval = SCTP_IERROR_ERROR;
1967 case SCTP_PARAM_ACTION_SKIP_ERR:
1968 /* Make an ERROR chunk, preparing enough room for
1969 * returning multiple unknown parameters.
1972 *errp = sctp_make_op_error_space(asoc, chunk,
1973 ntohs(chunk->chunk_hdr->length));
1976 sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
1977 WORD_ROUND(ntohs(param.p->length)));
1978 sctp_addto_chunk(*errp,
1979 WORD_ROUND(ntohs(param.p->length)),
1982 /* If there is no memory for generating the ERROR
1983 * report as specified, an ABORT will be triggered
1984 * to the peer and the association won't be
1987 retval = SCTP_IERROR_NOMEM;
1997 /* Verify variable length parameters
1999 * SCTP_IERROR_ABORT - trigger an ABORT
2000 * SCTP_IERROR_NOMEM - out of memory (abort)
2001 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2002 * SCTP_IERROR_NO_ERROR - continue with the chunk
2004 static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc,
2005 union sctp_params param,
2007 struct sctp_chunk *chunk,
2008 struct sctp_chunk **err_chunk)
2010 struct sctp_hmac_algo_param *hmacs;
2011 int retval = SCTP_IERROR_NO_ERROR;
2012 __u16 n_elt, id = 0;
2015 /* FIXME - This routine is not looking at each parameter per the
2016 * chunk type, i.e., unrecognized parameters should be further
2017 * identified based on the chunk id.
2020 switch (param.p->type) {
2021 case SCTP_PARAM_IPV4_ADDRESS:
2022 case SCTP_PARAM_IPV6_ADDRESS:
2023 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2024 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2025 case SCTP_PARAM_STATE_COOKIE:
2026 case SCTP_PARAM_HEARTBEAT_INFO:
2027 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2028 case SCTP_PARAM_ECN_CAPABLE:
2029 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2032 case SCTP_PARAM_SUPPORTED_EXT:
2033 if (!sctp_verify_ext_param(param))
2034 return SCTP_IERROR_ABORT;
2037 case SCTP_PARAM_SET_PRIMARY:
2038 if (sctp_addip_enable)
2042 case SCTP_PARAM_HOST_NAME_ADDRESS:
2043 /* Tell the peer, we won't support this param. */
2044 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2045 retval = SCTP_IERROR_ABORT;
2048 case SCTP_PARAM_FWD_TSN_SUPPORT:
2049 if (sctp_prsctp_enable)
2053 case SCTP_PARAM_RANDOM:
2054 if (!sctp_auth_enable)
2057 /* SCTP-AUTH: Secion 6.1
2058 * If the random number is not 32 byte long the association
2059 * MUST be aborted. The ABORT chunk SHOULD contain the error
2060 * cause 'Protocol Violation'.
2062 if (SCTP_AUTH_RANDOM_LENGTH !=
2063 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2064 sctp_process_inv_paramlength(asoc, param.p,
2066 retval = SCTP_IERROR_ABORT;
2070 case SCTP_PARAM_CHUNKS:
2071 if (!sctp_auth_enable)
2074 /* SCTP-AUTH: Section 3.2
2075 * The CHUNKS parameter MUST be included once in the INIT or
2076 * INIT-ACK chunk if the sender wants to receive authenticated
2077 * chunks. Its maximum length is 260 bytes.
2079 if (260 < ntohs(param.p->length)) {
2080 sctp_process_inv_paramlength(asoc, param.p,
2082 retval = SCTP_IERROR_ABORT;
2086 case SCTP_PARAM_HMAC_ALGO:
2087 if (!sctp_auth_enable)
2090 hmacs = (struct sctp_hmac_algo_param *)param.p;
2091 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2093 /* SCTP-AUTH: Section 6.1
2094 * The HMAC algorithm based on SHA-1 MUST be supported and
2095 * included in the HMAC-ALGO parameter.
2097 for (i = 0; i < n_elt; i++) {
2098 id = ntohs(hmacs->hmac_ids[i]);
2100 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2104 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2105 sctp_process_inv_paramlength(asoc, param.p, chunk,
2107 retval = SCTP_IERROR_ABORT;
2112 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2113 ntohs(param.p->type), cid);
2114 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2120 /* Verify the INIT packet before we process it. */
2121 int sctp_verify_init(const struct sctp_association *asoc,
2123 sctp_init_chunk_t *peer_init,
2124 struct sctp_chunk *chunk,
2125 struct sctp_chunk **errp)
2127 union sctp_params param;
2131 /* Verify stream values are non-zero. */
2132 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
2133 (0 == peer_init->init_hdr.num_inbound_streams) ||
2134 (0 == peer_init->init_hdr.init_tag) ||
2135 (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
2137 return sctp_process_inv_mandatory(asoc, chunk, errp);
2140 /* Check for missing mandatory parameters. */
2141 sctp_walk_params(param, peer_init, init_hdr.params) {
2143 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
2146 } /* for (loop through all parameters) */
2148 /* There is a possibility that a parameter length was bad and
2149 * in that case we would have stoped walking the parameters.
2150 * The current param.p would point at the bad one.
2151 * Current consensus on the mailing list is to generate a PROTOCOL
2152 * VIOLATION error. We build the ERROR chunk here and let the normal
2153 * error handling code build and send the packet.
2155 if (param.v != (void*)chunk->chunk_end)
2156 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2158 /* The only missing mandatory param possible today is
2159 * the state cookie for an INIT-ACK chunk.
2161 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2162 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2165 /* Verify all the variable length parameters */
2166 sctp_walk_params(param, peer_init, init_hdr.params) {
2168 result = sctp_verify_param(asoc, param, cid, chunk, errp);
2170 case SCTP_IERROR_ABORT:
2171 case SCTP_IERROR_NOMEM:
2173 case SCTP_IERROR_ERROR:
2175 case SCTP_IERROR_NO_ERROR:
2180 } /* for (loop through all parameters) */
2185 /* Unpack the parameters in an INIT packet into an association.
2186 * Returns 0 on failure, else success.
2187 * FIXME: This is an association method.
2189 int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
2190 const union sctp_addr *peer_addr,
2191 sctp_init_chunk_t *peer_init, gfp_t gfp)
2193 union sctp_params param;
2194 struct sctp_transport *transport;
2195 struct list_head *pos, *temp;
2198 /* We must include the address that the INIT packet came from.
2199 * This is the only address that matters for an INIT packet.
2200 * When processing a COOKIE ECHO, we retrieve the from address
2201 * of the INIT from the cookie.
2204 /* This implementation defaults to making the first transport
2205 * added as the primary transport. The source address seems to
2206 * be a a better choice than any of the embedded addresses.
2209 if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2213 /* Process the initialization parameters. */
2214 sctp_walk_params(param, peer_init, init_hdr.params) {
2216 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2220 /* AUTH: After processing the parameters, make sure that we
2221 * have all the required info to potentially do authentications.
2223 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2224 !asoc->peer.peer_hmacs))
2225 asoc->peer.auth_capable = 0;
2227 /* In a non-backward compatible mode, if the peer claims
2228 * support for ADD-IP but not AUTH, the ADD-IP spec states
2229 * that we MUST ABORT the association. Section 6. The section
2230 * also give us an option to silently ignore the packet, which
2231 * is what we'll do here.
2233 if (!sctp_addip_noauth &&
2234 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2235 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2237 SCTP_PARAM_SET_PRIMARY);
2238 asoc->peer.asconf_capable = 0;
2242 /* Walk list of transports, removing transports in the UNKNOWN state. */
2243 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2244 transport = list_entry(pos, struct sctp_transport, transports);
2245 if (transport->state == SCTP_UNKNOWN) {
2246 sctp_assoc_rm_peer(asoc, transport);
2250 /* The fixed INIT headers are always in network byte
2253 asoc->peer.i.init_tag =
2254 ntohl(peer_init->init_hdr.init_tag);
2255 asoc->peer.i.a_rwnd =
2256 ntohl(peer_init->init_hdr.a_rwnd);
2257 asoc->peer.i.num_outbound_streams =
2258 ntohs(peer_init->init_hdr.num_outbound_streams);
2259 asoc->peer.i.num_inbound_streams =
2260 ntohs(peer_init->init_hdr.num_inbound_streams);
2261 asoc->peer.i.initial_tsn =
2262 ntohl(peer_init->init_hdr.initial_tsn);
2264 /* Apply the upper bounds for output streams based on peer's
2265 * number of inbound streams.
2267 if (asoc->c.sinit_num_ostreams >
2268 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2269 asoc->c.sinit_num_ostreams =
2270 ntohs(peer_init->init_hdr.num_inbound_streams);
2273 if (asoc->c.sinit_max_instreams >
2274 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2275 asoc->c.sinit_max_instreams =
2276 ntohs(peer_init->init_hdr.num_outbound_streams);
2279 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2280 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2282 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2283 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2285 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2286 cookie = asoc->peer.cookie;
2288 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
2289 if (!asoc->peer.cookie)
2293 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2294 * high (for example, implementations MAY use the size of the receiver
2295 * advertised window).
2297 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2299 transport->ssthresh = asoc->peer.i.a_rwnd;
2302 /* Set up the TSN tracking pieces. */
2303 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2304 asoc->peer.i.initial_tsn, gfp))
2307 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2309 * The stream sequence number in all the streams shall start
2310 * from 0 when the association is established. Also, when the
2311 * stream sequence number reaches the value 65535 the next
2312 * stream sequence number shall be set to 0.
2315 /* Allocate storage for the negotiated streams if it is not a temporary
2321 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2322 asoc->c.sinit_num_ostreams, gfp);
2326 error = sctp_assoc_set_id(asoc, gfp);
2331 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2333 * When an endpoint has an ASCONF signaled change to be sent to the
2334 * remote endpoint it should do the following:
2336 * A2) A serial number should be assigned to the Chunk. The serial
2337 * number should be a monotonically increasing number. All serial
2338 * numbers are defined to be initialized at the start of the
2339 * association to the same value as the Initial TSN.
2341 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2345 /* Release the transport structures. */
2346 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2347 transport = list_entry(pos, struct sctp_transport, transports);
2348 if (transport->state != SCTP_ACTIVE)
2349 sctp_assoc_rm_peer(asoc, transport);
2357 /* Update asoc with the option described in param.
2359 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2361 * asoc is the association to update.
2362 * param is the variable length parameter to use for update.
2363 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2364 * If the current packet is an INIT we want to minimize the amount of
2365 * work we do. In particular, we should not build transport
2366 * structures for the addresses.
2368 static int sctp_process_param(struct sctp_association *asoc,
2369 union sctp_params param,
2370 const union sctp_addr *peer_addr,
2373 union sctp_addr addr;
2380 union sctp_addr_param *addr_param;
2381 struct sctp_transport *t;
2383 /* We maintain all INIT parameters in network byte order all the
2384 * time. This allows us to not worry about whether the parameters
2385 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2387 switch (param.p->type) {
2388 case SCTP_PARAM_IPV6_ADDRESS:
2389 if (PF_INET6 != asoc->base.sk->sk_family)
2393 case SCTP_PARAM_IPV4_ADDRESS:
2394 /* v4 addresses are not allowed on v6-only socket */
2395 if (ipv6_only_sock(asoc->base.sk))
2398 af = sctp_get_af_specific(param_type2af(param.p->type));
2399 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
2400 scope = sctp_scope(peer_addr);
2401 if (sctp_in_scope(&addr, scope))
2402 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2406 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2407 if (!sctp_cookie_preserve_enable)
2410 stale = ntohl(param.life->lifespan_increment);
2412 /* Suggested Cookie Life span increment's unit is msec,
2415 asoc->cookie_life.tv_sec += stale / 1000;
2416 asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
2419 case SCTP_PARAM_HOST_NAME_ADDRESS:
2420 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2423 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2424 /* Turn off the default values first so we'll know which
2425 * ones are really set by the peer.
2427 asoc->peer.ipv4_address = 0;
2428 asoc->peer.ipv6_address = 0;
2430 /* Assume that peer supports the address family
2431 * by which it sends a packet.
2433 if (peer_addr->sa.sa_family == AF_INET6)
2434 asoc->peer.ipv6_address = 1;
2435 else if (peer_addr->sa.sa_family == AF_INET)
2436 asoc->peer.ipv4_address = 1;
2438 /* Cycle through address types; avoid divide by 0. */
2439 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2441 sat /= sizeof(__u16);
2443 for (i = 0; i < sat; ++i) {
2444 switch (param.sat->types[i]) {
2445 case SCTP_PARAM_IPV4_ADDRESS:
2446 asoc->peer.ipv4_address = 1;
2449 case SCTP_PARAM_IPV6_ADDRESS:
2450 if (PF_INET6 == asoc->base.sk->sk_family)
2451 asoc->peer.ipv6_address = 1;
2454 case SCTP_PARAM_HOST_NAME_ADDRESS:
2455 asoc->peer.hostname_address = 1;
2458 default: /* Just ignore anything else. */
2464 case SCTP_PARAM_STATE_COOKIE:
2465 asoc->peer.cookie_len =
2466 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2467 asoc->peer.cookie = param.cookie->body;
2470 case SCTP_PARAM_HEARTBEAT_INFO:
2471 /* Would be odd to receive, but it causes no problems. */
2474 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2475 /* Rejected during verify stage. */
2478 case SCTP_PARAM_ECN_CAPABLE:
2479 asoc->peer.ecn_capable = 1;
2482 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2483 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2486 case SCTP_PARAM_SET_PRIMARY:
2487 if (!sctp_addip_enable)
2490 addr_param = param.v + sizeof(sctp_addip_param_t);
2492 af = sctp_get_af_specific(param_type2af(param.p->type));
2493 af->from_addr_param(&addr, addr_param,
2494 htons(asoc->peer.port), 0);
2496 /* if the address is invalid, we can't process it.
2497 * XXX: see spec for what to do.
2499 if (!af->addr_valid(&addr, NULL, NULL))
2502 t = sctp_assoc_lookup_paddr(asoc, &addr);
2506 sctp_assoc_set_primary(asoc, t);
2509 case SCTP_PARAM_SUPPORTED_EXT:
2510 sctp_process_ext_param(asoc, param);
2513 case SCTP_PARAM_FWD_TSN_SUPPORT:
2514 if (sctp_prsctp_enable) {
2515 asoc->peer.prsctp_capable = 1;
2521 case SCTP_PARAM_RANDOM:
2522 if (!sctp_auth_enable)
2525 /* Save peer's random parameter */
2526 asoc->peer.peer_random = kmemdup(param.p,
2527 ntohs(param.p->length), gfp);
2528 if (!asoc->peer.peer_random) {
2534 case SCTP_PARAM_HMAC_ALGO:
2535 if (!sctp_auth_enable)
2538 /* Save peer's HMAC list */
2539 asoc->peer.peer_hmacs = kmemdup(param.p,
2540 ntohs(param.p->length), gfp);
2541 if (!asoc->peer.peer_hmacs) {
2546 /* Set the default HMAC the peer requested*/
2547 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2550 case SCTP_PARAM_CHUNKS:
2551 if (!sctp_auth_enable)
2554 asoc->peer.peer_chunks = kmemdup(param.p,
2555 ntohs(param.p->length), gfp);
2556 if (!asoc->peer.peer_chunks)
2561 /* Any unrecognized parameters should have been caught
2562 * and handled by sctp_verify_param() which should be
2563 * called prior to this routine. Simply log the error
2566 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2567 ntohs(param.p->type), asoc);
2574 /* Select a new verification tag. */
2575 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2577 /* I believe that this random number generator complies with RFC1750.
2578 * A tag of 0 is reserved for special cases (e.g. INIT).
2583 get_random_bytes(&x, sizeof(__u32));
2589 /* Select an initial TSN to send during startup. */
2590 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2594 get_random_bytes(&retval, sizeof(__u32));
2599 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2601 * 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
2602 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2603 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2604 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2606 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2607 * | Address Parameter |
2608 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2609 * | ASCONF Parameter #1 |
2610 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2614 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2615 * | ASCONF Parameter #N |
2616 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2618 * Address Parameter and other parameter will not be wrapped in this function
2620 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2621 union sctp_addr *addr,
2624 sctp_addiphdr_t asconf;
2625 struct sctp_chunk *retval;
2626 int length = sizeof(asconf) + vparam_len;
2627 union sctp_addr_param addrparam;
2629 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2631 addrlen = af->to_addr_param(addr, &addrparam);
2636 /* Create the chunk. */
2637 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2641 asconf.serial = htonl(asoc->addip_serial++);
2643 retval->subh.addip_hdr =
2644 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2645 retval->param_hdr.v =
2646 sctp_addto_chunk(retval, addrlen, &addrparam);
2652 * 3.2.1 Add IP Address
2654 * 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
2655 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2656 * | Type = 0xC001 | Length = Variable |
2657 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2658 * | ASCONF-Request Correlation ID |
2659 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2660 * | Address Parameter |
2661 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2663 * 3.2.2 Delete IP Address
2665 * 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
2666 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2667 * | Type = 0xC002 | Length = Variable |
2668 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2669 * | ASCONF-Request Correlation ID |
2670 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2671 * | Address Parameter |
2672 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2675 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2676 union sctp_addr *laddr,
2677 struct sockaddr *addrs,
2681 sctp_addip_param_t param;
2682 struct sctp_chunk *retval;
2683 union sctp_addr_param addr_param;
2684 union sctp_addr *addr;
2687 int paramlen = sizeof(param);
2688 int addr_param_len = 0;
2692 /* Get total length of all the address parameters. */
2694 for (i = 0; i < addrcnt; i++) {
2695 addr = (union sctp_addr *)addr_buf;
2696 af = sctp_get_af_specific(addr->v4.sin_family);
2697 addr_param_len = af->to_addr_param(addr, &addr_param);
2699 totallen += paramlen;
2700 totallen += addr_param_len;
2702 addr_buf += af->sockaddr_len;
2705 /* Create an asconf chunk with the required length. */
2706 retval = sctp_make_asconf(asoc, laddr, totallen);
2710 /* Add the address parameters to the asconf chunk. */
2712 for (i = 0; i < addrcnt; i++) {
2713 addr = (union sctp_addr *)addr_buf;
2714 af = sctp_get_af_specific(addr->v4.sin_family);
2715 addr_param_len = af->to_addr_param(addr, &addr_param);
2716 param.param_hdr.type = flags;
2717 param.param_hdr.length = htons(paramlen + addr_param_len);
2720 sctp_addto_chunk(retval, paramlen, ¶m);
2721 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2723 addr_buf += af->sockaddr_len;
2729 * 3.2.4 Set Primary IP Address
2731 * 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
2732 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2733 * | Type =0xC004 | Length = Variable |
2734 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2735 * | ASCONF-Request Correlation ID |
2736 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2737 * | Address Parameter |
2738 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2740 * Create an ASCONF chunk with Set Primary IP address parameter.
2742 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2743 union sctp_addr *addr)
2745 sctp_addip_param_t param;
2746 struct sctp_chunk *retval;
2747 int len = sizeof(param);
2748 union sctp_addr_param addrparam;
2750 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2752 addrlen = af->to_addr_param(addr, &addrparam);
2757 /* Create the chunk and make asconf header. */
2758 retval = sctp_make_asconf(asoc, addr, len);
2762 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2763 param.param_hdr.length = htons(len);
2766 sctp_addto_chunk(retval, sizeof(param), ¶m);
2767 sctp_addto_chunk(retval, addrlen, &addrparam);
2772 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2774 * 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
2775 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2776 * | Type = 0x80 | Chunk Flags | Chunk Length |
2777 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2779 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2780 * | ASCONF Parameter Response#1 |
2781 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2785 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2786 * | ASCONF Parameter Response#N |
2787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2789 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2791 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2792 __u32 serial, int vparam_len)
2794 sctp_addiphdr_t asconf;
2795 struct sctp_chunk *retval;
2796 int length = sizeof(asconf) + vparam_len;
2798 /* Create the chunk. */
2799 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2803 asconf.serial = htonl(serial);
2805 retval->subh.addip_hdr =
2806 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2811 /* Add response parameters to an ASCONF_ACK chunk. */
2812 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2813 __be16 err_code, sctp_addip_param_t *asconf_param)
2815 sctp_addip_param_t ack_param;
2816 sctp_errhdr_t err_param;
2817 int asconf_param_len = 0;
2818 int err_param_len = 0;
2819 __be16 response_type;
2821 if (SCTP_ERROR_NO_ERROR == err_code) {
2822 response_type = SCTP_PARAM_SUCCESS_REPORT;
2824 response_type = SCTP_PARAM_ERR_CAUSE;
2825 err_param_len = sizeof(err_param);
2828 ntohs(asconf_param->param_hdr.length);
2831 /* Add Success Indication or Error Cause Indication parameter. */
2832 ack_param.param_hdr.type = response_type;
2833 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2836 ack_param.crr_id = crr_id;
2837 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2839 if (SCTP_ERROR_NO_ERROR == err_code)
2842 /* Add Error Cause parameter. */
2843 err_param.cause = err_code;
2844 err_param.length = htons(err_param_len + asconf_param_len);
2845 sctp_addto_chunk(chunk, err_param_len, &err_param);
2847 /* Add the failed TLV copied from ASCONF chunk. */
2849 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2852 /* Process a asconf parameter. */
2853 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
2854 struct sctp_chunk *asconf,
2855 sctp_addip_param_t *asconf_param)
2857 struct sctp_transport *peer;
2859 union sctp_addr addr;
2860 union sctp_addr_param *addr_param;
2862 addr_param = (union sctp_addr_param *)
2863 ((void *)asconf_param + sizeof(sctp_addip_param_t));
2865 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
2866 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
2867 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
2868 return SCTP_ERROR_UNKNOWN_PARAM;
2870 switch (addr_param->v4.param_hdr.type) {
2871 case SCTP_PARAM_IPV6_ADDRESS:
2872 if (!asoc->peer.ipv6_address)
2873 return SCTP_ERROR_DNS_FAILED;
2875 case SCTP_PARAM_IPV4_ADDRESS:
2876 if (!asoc->peer.ipv4_address)
2877 return SCTP_ERROR_DNS_FAILED;
2880 return SCTP_ERROR_DNS_FAILED;
2883 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
2885 return SCTP_ERROR_DNS_FAILED;
2887 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
2889 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
2890 * or multicast address.
2891 * (note: wildcard is permitted and requires special handling so
2892 * make sure we check for that)
2894 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
2895 return SCTP_ERROR_DNS_FAILED;
2897 switch (asconf_param->param_hdr.type) {
2898 case SCTP_PARAM_ADD_IP:
2900 * If the address 0.0.0.0 or ::0 is provided, the source
2901 * address of the packet MUST be added.
2903 if (af->is_any(&addr))
2904 memcpy(&addr, &asconf->source, sizeof(addr));
2906 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
2907 * request and does not have the local resources to add this
2908 * new address to the association, it MUST return an Error
2909 * Cause TLV set to the new error code 'Operation Refused
2910 * Due to Resource Shortage'.
2913 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
2915 return SCTP_ERROR_RSRC_LOW;
2917 /* Start the heartbeat timer. */
2918 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
2919 sctp_transport_hold(peer);
2921 case SCTP_PARAM_DEL_IP:
2922 /* ADDIP 4.3 D7) If a request is received to delete the
2923 * last remaining IP address of a peer endpoint, the receiver
2924 * MUST send an Error Cause TLV with the error cause set to the
2925 * new error code 'Request to Delete Last Remaining IP Address'.
2927 if (asoc->peer.transport_count == 1)
2928 return SCTP_ERROR_DEL_LAST_IP;
2930 /* ADDIP 4.3 D8) If a request is received to delete an IP
2931 * address which is also the source address of the IP packet
2932 * which contained the ASCONF chunk, the receiver MUST reject
2933 * this request. To reject the request the receiver MUST send
2934 * an Error Cause TLV set to the new error code 'Request to
2935 * Delete Source IP Address'
2937 if (sctp_cmp_addr_exact(sctp_source(asconf), &addr))
2938 return SCTP_ERROR_DEL_SRC_IP;
2941 * If the address 0.0.0.0 or ::0 is provided, all
2942 * addresses of the peer except the source address of the
2943 * packet MUST be deleted.
2945 if (af->is_any(&addr)) {
2946 sctp_assoc_set_primary(asoc, asconf->transport);
2947 sctp_assoc_del_nonprimary_peers(asoc,
2950 sctp_assoc_del_peer(asoc, &addr);
2952 case SCTP_PARAM_SET_PRIMARY:
2953 /* ADDIP Section 4.2.4
2954 * If the address 0.0.0.0 or ::0 is provided, the receiver
2955 * MAY mark the source address of the packet as its
2958 if (af->is_any(&addr))
2959 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
2961 peer = sctp_assoc_lookup_paddr(asoc, &addr);
2963 return SCTP_ERROR_DNS_FAILED;
2965 sctp_assoc_set_primary(asoc, peer);
2969 return SCTP_ERROR_NO_ERROR;
2972 /* Verify the ASCONF packet before we process it. */
2973 int sctp_verify_asconf(const struct sctp_association *asoc,
2974 struct sctp_paramhdr *param_hdr, void *chunk_end,
2975 struct sctp_paramhdr **errp) {
2976 sctp_addip_param_t *asconf_param;
2977 union sctp_params param;
2980 param.v = (sctp_paramhdr_t *) param_hdr;
2981 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
2982 length = ntohs(param.p->length);
2985 if (param.v > chunk_end - length ||
2986 length < sizeof(sctp_paramhdr_t))
2989 switch (param.p->type) {
2990 case SCTP_PARAM_ADD_IP:
2991 case SCTP_PARAM_DEL_IP:
2992 case SCTP_PARAM_SET_PRIMARY:
2993 asconf_param = (sctp_addip_param_t *)param.v;
2994 plen = ntohs(asconf_param->param_hdr.length);
2995 if (plen < sizeof(sctp_addip_param_t) +
2996 sizeof(sctp_paramhdr_t))
2999 case SCTP_PARAM_SUCCESS_REPORT:
3000 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3001 if (length != sizeof(sctp_addip_param_t))
3009 param.v += WORD_ROUND(length);
3012 if (param.v != chunk_end)
3018 /* Process an incoming ASCONF chunk with the next expected serial no. and
3019 * return an ASCONF_ACK chunk to be sent in response.
3021 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3022 struct sctp_chunk *asconf)
3024 sctp_addiphdr_t *hdr;
3025 union sctp_addr_param *addr_param;
3026 sctp_addip_param_t *asconf_param;
3027 struct sctp_chunk *asconf_ack;
3033 int all_param_pass = 1;
3035 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
3036 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3037 serial = ntohl(hdr->serial);
3039 /* Skip the addiphdr and store a pointer to address parameter. */
3040 length = sizeof(sctp_addiphdr_t);
3041 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3042 chunk_len -= length;
3044 /* Skip the address parameter and store a pointer to the first
3047 length = ntohs(addr_param->v4.param_hdr.length);
3048 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
3049 chunk_len -= length;
3051 /* create an ASCONF_ACK chunk.
3052 * Based on the definitions of parameters, we know that the size of
3053 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
3056 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2);
3060 /* Process the TLVs contained within the ASCONF chunk. */
3061 while (chunk_len > 0) {
3062 err_code = sctp_process_asconf_param(asoc, asconf,
3065 * If an error response is received for a TLV parameter,
3066 * all TLVs with no response before the failed TLV are
3067 * considered successful if not reported. All TLVs after
3068 * the failed response are considered unsuccessful unless
3069 * a specific success indication is present for the parameter.
3071 if (SCTP_ERROR_NO_ERROR != err_code)
3074 if (!all_param_pass)
3075 sctp_add_asconf_response(asconf_ack,
3076 asconf_param->crr_id, err_code,
3079 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3080 * an IP address sends an 'Out of Resource' in its response, it
3081 * MUST also fail any subsequent add or delete requests bundled
3084 if (SCTP_ERROR_RSRC_LOW == err_code)
3087 /* Move to the next ASCONF param. */
3088 length = ntohs(asconf_param->param_hdr.length);
3089 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
3091 chunk_len -= length;
3095 asoc->peer.addip_serial++;
3097 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3098 * after freeing the reference to old asconf ack if any.
3101 sctp_chunk_hold(asconf_ack);
3102 list_add_tail(&asconf_ack->transmitted_list,
3103 &asoc->asconf_ack_list);
3109 /* Process a asconf parameter that is successfully acked. */
3110 static void sctp_asconf_param_success(struct sctp_association *asoc,
3111 sctp_addip_param_t *asconf_param)
3114 union sctp_addr addr;
3115 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3116 union sctp_addr_param *addr_param;
3117 struct sctp_transport *transport;
3118 struct sctp_sockaddr_entry *saddr;
3120 addr_param = (union sctp_addr_param *)
3121 ((void *)asconf_param + sizeof(sctp_addip_param_t));
3123 /* We have checked the packet before, so we do not check again. */
3124 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
3125 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
3127 switch (asconf_param->param_hdr.type) {
3128 case SCTP_PARAM_ADD_IP:
3129 /* This is always done in BH context with a socket lock
3130 * held, so the list can not change.
3133 list_for_each_entry(saddr, &bp->address_list, list) {
3134 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3135 saddr->state = SCTP_ADDR_SRC;
3138 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3140 if (transport->state == SCTP_ACTIVE)
3142 dst_release(transport->dst);
3143 sctp_transport_route(transport, NULL,
3144 sctp_sk(asoc->base.sk));
3147 case SCTP_PARAM_DEL_IP:
3149 sctp_del_bind_addr(bp, &addr);
3151 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3153 dst_release(transport->dst);
3154 sctp_transport_route(transport, NULL,
3155 sctp_sk(asoc->base.sk));
3163 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3164 * for the given asconf parameter. If there is no response for this parameter,
3165 * return the error code based on the third argument 'no_err'.
3167 * A7) If an error response is received for a TLV parameter, all TLVs with no
3168 * response before the failed TLV are considered successful if not reported.
3169 * All TLVs after the failed response are considered unsuccessful unless a
3170 * specific success indication is present for the parameter.
3172 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3173 sctp_addip_param_t *asconf_param,
3176 sctp_addip_param_t *asconf_ack_param;
3177 sctp_errhdr_t *err_param;
3183 err_code = SCTP_ERROR_NO_ERROR;
3185 err_code = SCTP_ERROR_REQ_REFUSED;
3187 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3188 sizeof(sctp_chunkhdr_t);
3190 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3191 * the first asconf_ack parameter.
3193 length = sizeof(sctp_addiphdr_t);
3194 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3196 asconf_ack_len -= length;
3198 while (asconf_ack_len > 0) {
3199 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3200 switch(asconf_ack_param->param_hdr.type) {
3201 case SCTP_PARAM_SUCCESS_REPORT:
3202 return SCTP_ERROR_NO_ERROR;
3203 case SCTP_PARAM_ERR_CAUSE:
3204 length = sizeof(sctp_addip_param_t);
3205 err_param = (sctp_errhdr_t *)
3206 ((void *)asconf_ack_param + length);
3207 asconf_ack_len -= length;
3208 if (asconf_ack_len > 0)
3209 return err_param->cause;
3211 return SCTP_ERROR_INV_PARAM;
3214 return SCTP_ERROR_INV_PARAM;
3218 length = ntohs(asconf_ack_param->param_hdr.length);
3219 asconf_ack_param = (sctp_addip_param_t *)
3220 ((void *)asconf_ack_param + length);
3221 asconf_ack_len -= length;
3227 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3228 int sctp_process_asconf_ack(struct sctp_association *asoc,
3229 struct sctp_chunk *asconf_ack)
3231 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3232 union sctp_addr_param *addr_param;
3233 sctp_addip_param_t *asconf_param;
3235 int asconf_len = asconf->skb->len;
3236 int all_param_pass = 0;
3239 __be16 err_code = SCTP_ERROR_NO_ERROR;
3241 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3242 * a pointer to address parameter.
3244 length = sizeof(sctp_addip_chunk_t);
3245 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3246 asconf_len -= length;
3248 /* Skip the address parameter in the last asconf sent and store a
3249 * pointer to the first asconf parameter.
3251 length = ntohs(addr_param->v4.param_hdr.length);
3252 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
3253 asconf_len -= length;
3256 * A8) If there is no response(s) to specific TLV parameter(s), and no
3257 * failures are indicated, then all request(s) are considered
3260 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3263 /* Process the TLVs contained in the last sent ASCONF chunk. */
3264 while (asconf_len > 0) {
3266 err_code = SCTP_ERROR_NO_ERROR;
3268 err_code = sctp_get_asconf_response(asconf_ack,
3271 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3276 case SCTP_ERROR_NO_ERROR:
3277 sctp_asconf_param_success(asoc, asconf_param);
3280 case SCTP_ERROR_RSRC_LOW:
3284 case SCTP_ERROR_UNKNOWN_PARAM:
3285 /* Disable sending this type of asconf parameter in
3288 asoc->peer.addip_disabled_mask |=
3289 asconf_param->param_hdr.type;
3292 case SCTP_ERROR_REQ_REFUSED:
3293 case SCTP_ERROR_DEL_LAST_IP:
3294 case SCTP_ERROR_DEL_SRC_IP:
3299 /* Skip the processed asconf parameter and move to the next
3302 length = ntohs(asconf_param->param_hdr.length);
3303 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
3305 asconf_len -= length;
3308 /* Free the cached last sent asconf chunk. */
3309 list_del_init(&asconf->transmitted_list);
3310 sctp_chunk_free(asconf);
3311 asoc->addip_last_asconf = NULL;
3313 /* Send the next asconf chunk from the addip chunk queue. */
3314 if (!list_empty(&asoc->addip_chunk_list)) {
3315 struct list_head *entry = asoc->addip_chunk_list.next;
3316 asconf = list_entry(entry, struct sctp_chunk, list);
3318 list_del_init(entry);
3320 /* Hold the chunk until an ASCONF_ACK is received. */
3321 sctp_chunk_hold(asconf);
3322 if (sctp_primitive_ASCONF(asoc, asconf))
3323 sctp_chunk_free(asconf);
3325 asoc->addip_last_asconf = asconf;
3331 /* Make a FWD TSN chunk. */
3332 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3333 __u32 new_cum_tsn, size_t nstreams,
3334 struct sctp_fwdtsn_skip *skiplist)
3336 struct sctp_chunk *retval = NULL;
3337 struct sctp_fwdtsn_chunk *ftsn_chunk;
3338 struct sctp_fwdtsn_hdr ftsn_hdr;
3339 struct sctp_fwdtsn_skip skip;
3343 hint = (nstreams + 1) * sizeof(__u32);
3345 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3350 ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr;
3352 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3353 retval->subh.fwdtsn_hdr =
3354 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3356 for (i = 0; i < nstreams; i++) {
3357 skip.stream = skiplist[i].stream;
3358 skip.ssn = skiplist[i].ssn;
3359 sctp_addto_chunk(retval, sizeof(skip), &skip);