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, see
27 * <http://www.gnu.org/licenses/>.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <linux-sctp@vger.kernel.org>
33 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * C. Robin <chris@hundredacre.ac.uk>
37 * Jon Grimm <jgrimm@us.ibm.com>
38 * Xingang Guo <xingang.guo@intel.com>
39 * Dajiang Zhang <dajiang.zhang@nokia.com>
40 * Sridhar Samudrala <sri@us.ibm.com>
41 * Daisy Chang <daisyc@us.ibm.com>
42 * Ardelle Fan <ardelle.fan@intel.com>
43 * Kevin Gao <kevin.gao@intel.com>
46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48 #include <crypto/hash.h>
49 #include <linux/types.h>
50 #include <linux/kernel.h>
52 #include <linux/ipv6.h>
53 #include <linux/net.h>
54 #include <linux/inet.h>
55 #include <linux/scatterlist.h>
56 #include <linux/slab.h>
59 #include <linux/skbuff.h>
60 #include <linux/random.h> /* for get_random_bytes */
61 #include <net/sctp/sctp.h>
62 #include <net/sctp/sm.h>
64 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
65 __u8 type, __u8 flags, int paylen,
67 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
68 __u8 flags, int paylen, gfp_t gfp);
69 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
70 __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,
83 static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len,
86 /* Control chunk destructor */
87 static void sctp_control_release_owner(struct sk_buff *skb)
89 /*TODO: do memory release */
92 static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
94 struct sctp_association *asoc = chunk->asoc;
95 struct sk_buff *skb = chunk->skb;
97 /* TODO: properly account for control chunks.
98 * To do it right we'll need:
99 * 1) endpoint if association isn't known.
100 * 2) proper memory accounting.
102 * For now don't do anything for now.
104 skb->sk = asoc ? asoc->base.sk : NULL;
105 skb->destructor = sctp_control_release_owner;
108 /* What was the inbound interface for this chunk? */
109 int sctp_chunk_iif(const struct sctp_chunk *chunk)
111 struct sk_buff *skb = chunk->skb;
113 return SCTP_INPUT_CB(skb)->af->skb_iif(skb);
116 /* RFC 2960 3.3.2 Initiation (INIT) (1)
118 * Note 2: The ECN capable field is reserved for future use of
119 * Explicit Congestion Notification.
121 static const struct sctp_paramhdr ecap_param = {
122 SCTP_PARAM_ECN_CAPABLE,
123 cpu_to_be16(sizeof(struct sctp_paramhdr)),
125 static const struct sctp_paramhdr prsctp_param = {
126 SCTP_PARAM_FWD_TSN_SUPPORT,
127 cpu_to_be16(sizeof(struct sctp_paramhdr)),
130 /* A helper to initialize an op error inside a
131 * provided chunk, as most cause codes will be embedded inside an
134 void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
140 /* Cause code constants are now defined in network order. */
141 err.cause = cause_code;
142 len = sizeof(sctp_errhdr_t) + paylen;
143 err.length = htons(len);
144 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
147 /* A helper to initialize an op error inside a
148 * provided chunk, as most cause codes will be embedded inside an
149 * abort chunk. Differs from sctp_init_cause in that it won't oops
150 * if there isn't enough space in the op error chunk
152 static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
158 /* Cause code constants are now defined in network order. */
159 err.cause = cause_code;
160 len = sizeof(sctp_errhdr_t) + paylen;
161 err.length = htons(len);
163 if (skb_tailroom(chunk->skb) < len)
165 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
166 sizeof(sctp_errhdr_t),
170 /* 3.3.2 Initiation (INIT) (1)
172 * This chunk is used to initiate a SCTP association between two
173 * endpoints. The format of the INIT chunk is shown below:
176 * 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
177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
178 * | Type = 1 | Chunk Flags | Chunk Length |
179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
181 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
182 * | Advertised Receiver Window Credit (a_rwnd) |
183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
184 * | Number of Outbound Streams | Number of Inbound Streams |
185 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
187 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
189 * / Optional/Variable-Length Parameters /
191 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
194 * The INIT chunk contains the following parameters. Unless otherwise
195 * noted, each parameter MUST only be included once in the INIT chunk.
197 * Fixed Parameters Status
198 * ----------------------------------------------
199 * Initiate Tag Mandatory
200 * Advertised Receiver Window Credit Mandatory
201 * Number of Outbound Streams Mandatory
202 * Number of Inbound Streams Mandatory
203 * Initial TSN Mandatory
205 * Variable Parameters Status Type Value
206 * -------------------------------------------------------------
207 * IPv4 Address (Note 1) Optional 5
208 * IPv6 Address (Note 1) Optional 6
209 * Cookie Preservative Optional 9
210 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
211 * Host Name Address (Note 3) Optional 11
212 * Supported Address Types (Note 4) Optional 12
214 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
215 const struct sctp_bind_addr *bp,
216 gfp_t gfp, int vparam_len)
218 struct net *net = sock_net(asoc->base.sk);
219 struct sctp_endpoint *ep = asoc->ep;
220 struct sctp_inithdr init;
221 union sctp_params addrs;
223 struct sctp_chunk *retval = NULL;
224 int num_types, addrs_len = 0;
225 struct sctp_sock *sp;
226 struct sctp_supported_addrs_param sat;
228 struct sctp_adaptation_ind_param aiparam;
229 struct sctp_supported_ext_param ext_param;
232 struct sctp_paramhdr *auth_chunks = NULL,
235 /* RFC 2960 3.3.2 Initiation (INIT) (1)
237 * Note 1: The INIT chunks can contain multiple addresses that
238 * can be IPv4 and/or IPv6 in any combination.
242 /* Convert the provided bind address list to raw format. */
243 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
245 init.init_tag = htonl(asoc->c.my_vtag);
246 init.a_rwnd = htonl(asoc->rwnd);
247 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
248 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
249 init.initial_tsn = htonl(asoc->c.initial_tsn);
251 /* How many address types are needed? */
252 sp = sctp_sk(asoc->base.sk);
253 num_types = sp->pf->supported_addrs(sp, types);
255 chunksize = sizeof(init) + addrs_len;
256 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
257 chunksize += sizeof(ecap_param);
259 if (asoc->prsctp_enable)
260 chunksize += sizeof(prsctp_param);
262 /* ADDIP: Section 4.2.7:
263 * An implementation supporting this extension [ADDIP] MUST list
264 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
265 * INIT-ACK parameters.
267 if (net->sctp.addip_enable) {
268 extensions[num_ext] = SCTP_CID_ASCONF;
269 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
273 if (asoc->reconf_enable) {
274 extensions[num_ext] = SCTP_CID_RECONF;
278 if (sp->adaptation_ind)
279 chunksize += sizeof(aiparam);
281 chunksize += vparam_len;
283 /* Account for AUTH related parameters */
284 if (ep->auth_enable) {
285 /* Add random parameter length*/
286 chunksize += sizeof(asoc->c.auth_random);
288 /* Add HMACS parameter length if any were defined */
289 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
290 if (auth_hmacs->length)
291 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
295 /* Add CHUNKS parameter length */
296 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
297 if (auth_chunks->length)
298 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
302 extensions[num_ext] = SCTP_CID_AUTH;
306 /* If we have any extensions to report, account for that */
308 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
310 /* RFC 2960 3.3.2 Initiation (INIT) (1)
312 * Note 3: An INIT chunk MUST NOT contain more than one Host
313 * Name address parameter. Moreover, the sender of the INIT
314 * MUST NOT combine any other address types with the Host Name
315 * address in the INIT. The receiver of INIT MUST ignore any
316 * other address types if the Host Name address parameter is
317 * present in the received INIT chunk.
319 * PLEASE DO NOT FIXME [This version does not support Host Name.]
322 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
326 retval->subh.init_hdr =
327 sctp_addto_chunk(retval, sizeof(init), &init);
328 retval->param_hdr.v =
329 sctp_addto_chunk(retval, addrs_len, addrs.v);
331 /* RFC 2960 3.3.2 Initiation (INIT) (1)
333 * Note 4: This parameter, when present, specifies all the
334 * address types the sending endpoint can support. The absence
335 * of this parameter indicates that the sending endpoint can
336 * support any address type.
338 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
339 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
340 sctp_addto_chunk(retval, sizeof(sat), &sat);
341 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
343 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
345 /* Add the supported extensions parameter. Be nice and add this
346 * fist before addiding the parameters for the extensions themselves
349 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
350 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
351 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
352 sctp_addto_param(retval, num_ext, extensions);
355 if (asoc->prsctp_enable)
356 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
358 if (sp->adaptation_ind) {
359 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
360 aiparam.param_hdr.length = htons(sizeof(aiparam));
361 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
362 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
365 /* Add SCTP-AUTH chunks to the parameter list */
366 if (ep->auth_enable) {
367 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
368 asoc->c.auth_random);
370 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
373 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
381 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
382 const struct sctp_chunk *chunk,
383 gfp_t gfp, int unkparam_len)
385 struct sctp_inithdr initack;
386 struct sctp_chunk *retval;
387 union sctp_params addrs;
388 struct sctp_sock *sp;
390 sctp_cookie_param_t *cookie;
393 struct sctp_adaptation_ind_param aiparam;
394 struct sctp_supported_ext_param ext_param;
397 struct sctp_paramhdr *auth_chunks = NULL,
403 /* Note: there may be no addresses to embed. */
404 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
406 initack.init_tag = htonl(asoc->c.my_vtag);
407 initack.a_rwnd = htonl(asoc->rwnd);
408 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
409 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
410 initack.initial_tsn = htonl(asoc->c.initial_tsn);
412 /* FIXME: We really ought to build the cookie right
413 * into the packet instead of allocating more fresh memory.
415 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
420 /* Calculate the total size of allocation, include the reserved
421 * space for reporting unknown parameters if it is specified.
423 sp = sctp_sk(asoc->base.sk);
424 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
426 /* Tell peer that we'll do ECN only if peer advertised such cap. */
427 if (asoc->peer.ecn_capable)
428 chunksize += sizeof(ecap_param);
430 if (asoc->peer.prsctp_capable)
431 chunksize += sizeof(prsctp_param);
433 if (asoc->peer.asconf_capable) {
434 extensions[num_ext] = SCTP_CID_ASCONF;
435 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
439 if (asoc->peer.reconf_capable) {
440 extensions[num_ext] = SCTP_CID_RECONF;
444 if (sp->adaptation_ind)
445 chunksize += sizeof(aiparam);
447 if (asoc->peer.auth_capable) {
448 auth_random = (struct sctp_paramhdr *)asoc->c.auth_random;
449 chunksize += ntohs(auth_random->length);
451 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
452 if (auth_hmacs->length)
453 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
457 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
458 if (auth_chunks->length)
459 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
463 extensions[num_ext] = SCTP_CID_AUTH;
468 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
470 /* Now allocate and fill out the chunk. */
471 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
475 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
477 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
478 * HEARTBEAT ACK, * etc.) to the same destination transport
479 * address from which it received the DATA or control chunk
480 * to which it is replying.
482 * [INIT ACK back to where the INIT came from.]
484 retval->transport = chunk->transport;
486 retval->subh.init_hdr =
487 sctp_addto_chunk(retval, sizeof(initack), &initack);
488 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
489 sctp_addto_chunk(retval, cookie_len, cookie);
490 if (asoc->peer.ecn_capable)
491 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
493 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
494 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
495 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
496 sctp_addto_param(retval, num_ext, extensions);
498 if (asoc->peer.prsctp_capable)
499 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
501 if (sp->adaptation_ind) {
502 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
503 aiparam.param_hdr.length = htons(sizeof(aiparam));
504 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
505 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
508 if (asoc->peer.auth_capable) {
509 sctp_addto_chunk(retval, ntohs(auth_random->length),
512 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
515 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
519 /* We need to remove the const qualifier at this point. */
520 retval->asoc = (struct sctp_association *) asoc;
529 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
531 * This chunk is used only during the initialization of an association.
532 * It is sent by the initiator of an association to its peer to complete
533 * the initialization process. This chunk MUST precede any DATA chunk
534 * sent within the association, but MAY be bundled with one or more DATA
535 * chunks in the same packet.
538 * 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
539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
540 * | Type = 10 |Chunk Flags | Length |
541 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
544 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
548 * Set to zero on transmit and ignored on receipt.
550 * Length: 16 bits (unsigned integer)
552 * Set to the size of the chunk in bytes, including the 4 bytes of
553 * the chunk header and the size of the Cookie.
555 * Cookie: variable size
557 * This field must contain the exact cookie received in the
558 * State Cookie parameter from the previous INIT ACK.
560 * An implementation SHOULD make the cookie as small as possible
561 * to insure interoperability.
563 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
564 const struct sctp_chunk *chunk)
566 struct sctp_chunk *retval;
570 cookie = asoc->peer.cookie;
571 cookie_len = asoc->peer.cookie_len;
573 /* Build a cookie echo chunk. */
574 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
575 cookie_len, GFP_ATOMIC);
578 retval->subh.cookie_hdr =
579 sctp_addto_chunk(retval, cookie_len, cookie);
581 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
583 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
584 * HEARTBEAT ACK, * etc.) to the same destination transport
585 * address from which it * received the DATA or control chunk
586 * to which it is replying.
588 * [COOKIE ECHO back to where the INIT ACK came from.]
591 retval->transport = chunk->transport;
597 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
599 * This chunk is used only during the initialization of an
600 * association. It is used to acknowledge the receipt of a COOKIE
601 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
602 * within the association, but MAY be bundled with one or more DATA
603 * chunks or SACK chunk in the same SCTP packet.
606 * 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
607 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
608 * | Type = 11 |Chunk Flags | Length = 4 |
609 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
611 * Chunk Flags: 8 bits
613 * Set to zero on transmit and ignored on receipt.
615 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
616 const struct sctp_chunk *chunk)
618 struct sctp_chunk *retval;
620 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
622 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
624 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
625 * HEARTBEAT ACK, * etc.) to the same destination transport
626 * address from which it * received the DATA or control chunk
627 * to which it is replying.
629 * [COOKIE ACK back to where the COOKIE ECHO came from.]
632 retval->transport = chunk->transport;
638 * Appendix A: Explicit Congestion Notification:
641 * RFC 2481 details a specific bit for a sender to send in the header of
642 * its next outbound TCP segment to indicate to its peer that it has
643 * reduced its congestion window. This is termed the CWR bit. For
644 * SCTP the same indication is made by including the CWR chunk.
645 * This chunk contains one data element, i.e. the TSN number that
646 * was sent in the ECNE chunk. This element represents the lowest
647 * TSN number in the datagram that was originally marked with the
651 * 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
652 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
653 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
654 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
655 * | Lowest TSN Number |
656 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
658 * Note: The CWR is considered a Control chunk.
660 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
661 const __u32 lowest_tsn,
662 const struct sctp_chunk *chunk)
664 struct sctp_chunk *retval;
667 cwr.lowest_tsn = htonl(lowest_tsn);
668 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
669 sizeof(sctp_cwrhdr_t), GFP_ATOMIC);
674 retval->subh.ecn_cwr_hdr =
675 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
677 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
679 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
680 * HEARTBEAT ACK, * etc.) to the same destination transport
681 * address from which it * received the DATA or control chunk
682 * to which it is replying.
684 * [Report a reduced congestion window back to where the ECNE
688 retval->transport = chunk->transport;
694 /* Make an ECNE chunk. This is a congestion experienced report. */
695 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
696 const __u32 lowest_tsn)
698 struct sctp_chunk *retval;
701 ecne.lowest_tsn = htonl(lowest_tsn);
702 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
703 sizeof(sctp_ecnehdr_t), GFP_ATOMIC);
706 retval->subh.ecne_hdr =
707 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
713 /* Make a DATA chunk for the given association from the provided
714 * parameters. However, do not populate the data payload.
716 struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
717 const struct sctp_sndrcvinfo *sinfo,
718 int data_len, __u8 flags, __u16 ssn,
721 struct sctp_chunk *retval;
722 struct sctp_datahdr dp;
725 /* We assign the TSN as LATE as possible, not here when
726 * creating the chunk.
729 dp.stream = htons(sinfo->sinfo_stream);
730 dp.ppid = sinfo->sinfo_ppid;
732 /* Set the flags for an unordered send. */
733 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
734 flags |= SCTP_DATA_UNORDERED;
739 chunk_len = sizeof(dp) + data_len;
740 retval = sctp_make_data(asoc, flags, chunk_len, gfp);
744 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
745 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
751 /* Create a selective ackowledgement (SACK) for the given
752 * association. This reports on which TSN's we've seen to date,
753 * including duplicates and gaps.
755 struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
757 struct sctp_chunk *retval;
758 struct sctp_sackhdr sack;
761 __u16 num_gabs, num_dup_tsns;
762 struct sctp_association *aptr = (struct sctp_association *)asoc;
763 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
764 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
765 struct sctp_transport *trans;
767 memset(gabs, 0, sizeof(gabs));
768 ctsn = sctp_tsnmap_get_ctsn(map);
770 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
772 /* How much room is needed in the chunk? */
773 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
774 num_dup_tsns = sctp_tsnmap_num_dups(map);
776 /* Initialize the SACK header. */
777 sack.cum_tsn_ack = htonl(ctsn);
778 sack.a_rwnd = htonl(asoc->a_rwnd);
779 sack.num_gap_ack_blocks = htons(num_gabs);
780 sack.num_dup_tsns = htons(num_dup_tsns);
783 + sizeof(struct sctp_gap_ack_block) * num_gabs
784 + sizeof(__u32) * num_dup_tsns;
786 /* Create the chunk. */
787 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
791 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
793 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
794 * HEARTBEAT ACK, etc.) to the same destination transport
795 * address from which it received the DATA or control chunk to
796 * which it is replying. This rule should also be followed if
797 * the endpoint is bundling DATA chunks together with the
800 * However, when acknowledging multiple DATA chunks received
801 * in packets from different source addresses in a single
802 * SACK, the SACK chunk may be transmitted to one of the
803 * destination transport addresses from which the DATA or
804 * control chunks being acknowledged were received.
806 * [BUG: We do not implement the following paragraph.
807 * Perhaps we should remember the last transport we used for a
808 * SACK and avoid that (if possible) if we have seen any
809 * duplicates. --piggy]
811 * When a receiver of a duplicate DATA chunk sends a SACK to a
812 * multi- homed endpoint it MAY be beneficial to vary the
813 * destination address and not use the source address of the
814 * DATA chunk. The reason being that receiving a duplicate
815 * from a multi-homed endpoint might indicate that the return
816 * path (as specified in the source address of the DATA chunk)
817 * for the SACK is broken.
819 * [Send to the address from which we last received a DATA chunk.]
821 retval->transport = asoc->peer.last_data_from;
823 retval->subh.sack_hdr =
824 sctp_addto_chunk(retval, sizeof(sack), &sack);
826 /* Add the gap ack block information. */
828 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
831 /* Add the duplicate TSN information. */
833 aptr->stats.idupchunks += num_dup_tsns;
834 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
835 sctp_tsnmap_get_dups(map));
837 /* Once we have a sack generated, check to see what our sack
838 * generation is, if its 0, reset the transports to 0, and reset
839 * the association generation to 1
841 * The idea is that zero is never used as a valid generation for the
842 * association so no transport will match after a wrap event like this,
843 * Until the next sack
845 if (++aptr->peer.sack_generation == 0) {
846 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
848 trans->sack_generation = 0;
849 aptr->peer.sack_generation = 1;
855 /* Make a SHUTDOWN chunk. */
856 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
857 const struct sctp_chunk *chunk)
859 struct sctp_chunk *retval;
860 sctp_shutdownhdr_t shut;
863 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
864 shut.cum_tsn_ack = htonl(ctsn);
866 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
867 sizeof(sctp_shutdownhdr_t), GFP_ATOMIC);
871 retval->subh.shutdown_hdr =
872 sctp_addto_chunk(retval, sizeof(shut), &shut);
875 retval->transport = chunk->transport;
880 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
881 const struct sctp_chunk *chunk)
883 struct sctp_chunk *retval;
885 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
888 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
890 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
891 * HEARTBEAT ACK, * etc.) to the same destination transport
892 * address from which it * received the DATA or control chunk
893 * to which it is replying.
895 * [ACK back to where the SHUTDOWN came from.]
898 retval->transport = chunk->transport;
903 struct sctp_chunk *sctp_make_shutdown_complete(
904 const struct sctp_association *asoc,
905 const struct sctp_chunk *chunk)
907 struct sctp_chunk *retval;
910 /* Set the T-bit if we have no association (vtag will be
913 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
915 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
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 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
929 retval->transport = chunk->transport;
934 /* Create an ABORT. Note that we set the T bit if we have no
935 * association, except when responding to an INIT (sctpimpguide 2.41).
937 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
938 const struct sctp_chunk *chunk,
941 struct sctp_chunk *retval;
944 /* Set the T-bit if we have no association and 'chunk' is not
945 * an INIT (vtag will be reflected).
948 if (chunk && chunk->chunk_hdr &&
949 chunk->chunk_hdr->type == SCTP_CID_INIT)
952 flags = SCTP_CHUNK_FLAG_T;
955 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
958 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
960 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
961 * HEARTBEAT ACK, * etc.) to the same destination transport
962 * address from which it * received the DATA or control chunk
963 * to which it is replying.
965 * [ABORT back to where the offender came from.]
968 retval->transport = chunk->transport;
973 /* Helper to create ABORT with a NO_USER_DATA error. */
974 struct sctp_chunk *sctp_make_abort_no_data(
975 const struct sctp_association *asoc,
976 const struct sctp_chunk *chunk, __u32 tsn)
978 struct sctp_chunk *retval;
981 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
987 /* Put the tsn back into network byte order. */
988 payload = htonl(tsn);
989 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
990 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
992 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
994 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
995 * HEARTBEAT ACK, * etc.) to the same destination transport
996 * address from which it * received the DATA or control chunk
997 * to which it is replying.
999 * [ABORT back to where the offender came from.]
1002 retval->transport = chunk->transport;
1008 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1009 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1013 struct sctp_chunk *retval;
1014 void *payload = NULL;
1017 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
1022 /* Put the msg_iov together into payload. */
1023 payload = kmalloc(paylen, GFP_KERNEL);
1027 err = memcpy_from_msg(payload, msg, paylen);
1032 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1033 sctp_addto_chunk(retval, paylen, payload);
1043 sctp_chunk_free(retval);
1049 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1052 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1056 int chunklen = ntohs(chunk->chunk_hdr->length);
1058 target = skb_put(chunk->skb, len);
1061 memcpy(target, data, len);
1063 memset(target, 0, len);
1065 /* Adjust the chunk length field. */
1066 chunk->chunk_hdr->length = htons(chunklen + len);
1067 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1072 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1073 struct sctp_chunk *sctp_make_abort_violation(
1074 const struct sctp_association *asoc,
1075 const struct sctp_chunk *chunk,
1076 const __u8 *payload,
1077 const size_t paylen)
1079 struct sctp_chunk *retval;
1080 struct sctp_paramhdr phdr;
1082 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen +
1087 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen +
1090 phdr.type = htons(chunk->chunk_hdr->type);
1091 phdr.length = chunk->chunk_hdr->length;
1092 sctp_addto_chunk(retval, paylen, payload);
1093 sctp_addto_param(retval, sizeof(phdr), &phdr);
1099 struct sctp_chunk *sctp_make_violation_paramlen(
1100 const struct sctp_association *asoc,
1101 const struct sctp_chunk *chunk,
1102 struct sctp_paramhdr *param)
1104 struct sctp_chunk *retval;
1105 static const char error[] = "The following parameter had invalid length:";
1106 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1109 retval = sctp_make_abort(asoc, chunk, payload_len);
1113 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1114 sizeof(error) + sizeof(*param));
1115 sctp_addto_chunk(retval, sizeof(error), error);
1116 sctp_addto_param(retval, sizeof(*param), param);
1122 struct sctp_chunk *sctp_make_violation_max_retrans(
1123 const struct sctp_association *asoc,
1124 const struct sctp_chunk *chunk)
1126 struct sctp_chunk *retval;
1127 static const char error[] = "Association exceeded its max_retans count";
1128 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t);
1130 retval = sctp_make_abort(asoc, chunk, payload_len);
1134 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1135 sctp_addto_chunk(retval, sizeof(error), error);
1141 /* Make a HEARTBEAT chunk. */
1142 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1143 const struct sctp_transport *transport)
1145 struct sctp_chunk *retval;
1146 sctp_sender_hb_info_t hbinfo;
1148 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1149 sizeof(hbinfo), GFP_ATOMIC);
1154 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1155 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1156 hbinfo.daddr = transport->ipaddr;
1157 hbinfo.sent_at = jiffies;
1158 hbinfo.hb_nonce = transport->hb_nonce;
1160 /* Cast away the 'const', as this is just telling the chunk
1161 * what transport it belongs to.
1163 retval->transport = (struct sctp_transport *) transport;
1164 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1171 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1172 const struct sctp_chunk *chunk,
1173 const void *payload, const size_t paylen)
1175 struct sctp_chunk *retval;
1177 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1182 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1184 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1186 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1187 * HEARTBEAT ACK, * etc.) to the same destination transport
1188 * address from which it * received the DATA or control chunk
1189 * to which it is replying.
1191 * [HBACK back to where the HEARTBEAT came from.]
1194 retval->transport = chunk->transport;
1200 /* Create an Operation Error chunk with the specified space reserved.
1201 * This routine can be used for containing multiple causes in the chunk.
1203 static struct sctp_chunk *sctp_make_op_error_space(
1204 const struct sctp_association *asoc,
1205 const struct sctp_chunk *chunk,
1208 struct sctp_chunk *retval;
1210 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1211 sizeof(sctp_errhdr_t) + size, GFP_ATOMIC);
1215 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1217 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1218 * HEARTBEAT ACK, etc.) to the same destination transport
1219 * address from which it received the DATA or control chunk
1220 * to which it is replying.
1224 retval->transport = chunk->transport;
1230 /* Create an Operation Error chunk of a fixed size,
1231 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1232 * This is a helper function to allocate an error chunk for
1233 * for those invalid parameter codes in which we may not want
1234 * to report all the errors, if the incoming chunk is large
1236 static inline struct sctp_chunk *sctp_make_op_error_fixed(
1237 const struct sctp_association *asoc,
1238 const struct sctp_chunk *chunk)
1240 size_t size = asoc ? asoc->pathmtu : 0;
1243 size = SCTP_DEFAULT_MAXSEGMENT;
1245 return sctp_make_op_error_space(asoc, chunk, size);
1248 /* Create an Operation Error chunk. */
1249 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1250 const struct sctp_chunk *chunk,
1251 __be16 cause_code, const void *payload,
1252 size_t paylen, size_t reserve_tail)
1254 struct sctp_chunk *retval;
1256 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1260 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1261 sctp_addto_chunk(retval, paylen, payload);
1263 sctp_addto_param(retval, reserve_tail, NULL);
1269 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1271 struct sctp_chunk *retval;
1272 struct sctp_hmac *hmac_desc;
1273 struct sctp_authhdr auth_hdr;
1276 /* Get the first hmac that the peer told us to use */
1277 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1278 if (unlikely(!hmac_desc))
1281 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1282 hmac_desc->hmac_len + sizeof(sctp_authhdr_t),
1287 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1288 auth_hdr.shkey_id = htons(asoc->active_key_id);
1290 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1293 hmac = skb_put_zero(retval->skb, hmac_desc->hmac_len);
1295 /* Adjust the chunk header to include the empty MAC */
1296 retval->chunk_hdr->length =
1297 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1298 retval->chunk_end = skb_tail_pointer(retval->skb);
1304 /********************************************************************
1305 * 2nd Level Abstractions
1306 ********************************************************************/
1308 /* Turn an skb into a chunk.
1309 * FIXME: Eventually move the structure directly inside the skb->cb[].
1311 * sctpimpguide-05.txt Section 2.8.2
1312 * M1) Each time a new DATA chunk is transmitted
1313 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1314 * 'TSN.Missing.Report' count will be used to determine missing chunks
1315 * and when to fast retransmit.
1318 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1319 const struct sctp_association *asoc,
1320 struct sock *sk, gfp_t gfp)
1322 struct sctp_chunk *retval;
1324 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1329 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1331 INIT_LIST_HEAD(&retval->list);
1333 retval->asoc = (struct sctp_association *)asoc;
1334 retval->singleton = 1;
1336 retval->fast_retransmit = SCTP_CAN_FRTX;
1338 /* Polish the bead hole. */
1339 INIT_LIST_HEAD(&retval->transmitted_list);
1340 INIT_LIST_HEAD(&retval->frag_list);
1341 SCTP_DBG_OBJCNT_INC(chunk);
1342 refcount_set(&retval->refcnt, 1);
1348 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1349 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1350 union sctp_addr *dest)
1352 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1353 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1356 /* Extract the source address from a chunk. */
1357 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1359 /* If we have a known transport, use that. */
1360 if (chunk->transport) {
1361 return &chunk->transport->ipaddr;
1363 /* Otherwise, extract it from the IP header. */
1364 return &chunk->source;
1368 /* Create a new chunk, setting the type and flags headers from the
1369 * arguments, reserving enough space for a 'paylen' byte payload.
1371 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1372 __u8 type, __u8 flags, int paylen,
1375 struct sctp_chunk *retval;
1376 struct sctp_chunkhdr *chunk_hdr;
1377 struct sk_buff *skb;
1380 /* No need to allocate LL here, as this is only a chunk. */
1381 skb = alloc_skb(SCTP_PAD4(sizeof(*chunk_hdr) + paylen), gfp);
1385 /* Make room for the chunk header. */
1386 chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr));
1387 chunk_hdr->type = type;
1388 chunk_hdr->flags = flags;
1389 chunk_hdr->length = htons(sizeof(*chunk_hdr));
1391 sk = asoc ? asoc->base.sk : NULL;
1392 retval = sctp_chunkify(skb, asoc, sk, gfp);
1398 retval->chunk_hdr = chunk_hdr;
1399 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr);
1401 /* Determine if the chunk needs to be authenticated */
1402 if (sctp_auth_send_cid(type, asoc))
1410 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1411 __u8 flags, int paylen, gfp_t gfp)
1413 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1416 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1417 __u8 type, __u8 flags, int paylen,
1420 struct sctp_chunk *chunk;
1422 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1424 sctp_control_set_owner_w(chunk);
1429 /* Release the memory occupied by a chunk. */
1430 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1432 BUG_ON(!list_empty(&chunk->list));
1433 list_del_init(&chunk->transmitted_list);
1435 consume_skb(chunk->skb);
1436 consume_skb(chunk->auth_chunk);
1438 SCTP_DBG_OBJCNT_DEC(chunk);
1439 kmem_cache_free(sctp_chunk_cachep, chunk);
1442 /* Possibly, free the chunk. */
1443 void sctp_chunk_free(struct sctp_chunk *chunk)
1445 /* Release our reference on the message tracker. */
1447 sctp_datamsg_put(chunk->msg);
1449 sctp_chunk_put(chunk);
1452 /* Grab a reference to the chunk. */
1453 void sctp_chunk_hold(struct sctp_chunk *ch)
1455 refcount_inc(&ch->refcnt);
1458 /* Release a reference to the chunk. */
1459 void sctp_chunk_put(struct sctp_chunk *ch)
1461 if (refcount_dec_and_test(&ch->refcnt))
1462 sctp_chunk_destroy(ch);
1465 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1468 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1471 int chunklen = ntohs(chunk->chunk_hdr->length);
1472 int padlen = SCTP_PAD4(chunklen) - chunklen;
1474 skb_put_zero(chunk->skb, padlen);
1475 target = skb_put_data(chunk->skb, data, len);
1477 /* Adjust the chunk length field. */
1478 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1479 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1484 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1485 * space in the chunk
1487 static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1488 int len, const void *data)
1490 if (skb_tailroom(chunk->skb) >= len)
1491 return sctp_addto_chunk(chunk, len, data);
1496 /* Append bytes from user space to the end of a chunk. Will panic if
1497 * chunk is not big enough.
1498 * Returns a kernel err value.
1500 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1501 struct iov_iter *from)
1505 /* Make room in chunk for data. */
1506 target = skb_put(chunk->skb, len);
1508 /* Copy data (whole iovec) into chunk */
1509 if (!copy_from_iter_full(target, len, from))
1512 /* Adjust the chunk length field. */
1513 chunk->chunk_hdr->length =
1514 htons(ntohs(chunk->chunk_hdr->length) + len);
1515 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1520 /* Helper function to assign a TSN if needed. This assumes that both
1521 * the data_hdr and association have already been assigned.
1523 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1525 struct sctp_datamsg *msg;
1526 struct sctp_chunk *lchunk;
1527 struct sctp_stream *stream;
1534 /* All fragments will be on the same stream */
1535 sid = ntohs(chunk->subh.data_hdr->stream);
1536 stream = &chunk->asoc->stream;
1538 /* Now assign the sequence number to the entire message.
1539 * All fragments must have the same stream sequence number.
1542 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1543 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1546 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1547 ssn = sctp_ssn_next(stream, out, sid);
1549 ssn = sctp_ssn_peek(stream, out, sid);
1552 lchunk->subh.data_hdr->ssn = htons(ssn);
1553 lchunk->has_ssn = 1;
1557 /* Helper function to assign a TSN if needed. This assumes that both
1558 * the data_hdr and association have already been assigned.
1560 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1562 if (!chunk->has_tsn) {
1563 /* This is the last possible instant to
1566 chunk->subh.data_hdr->tsn =
1567 htonl(sctp_association_get_next_tsn(chunk->asoc));
1572 /* Create a CLOSED association to use with an incoming packet. */
1573 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1574 struct sctp_chunk *chunk,
1577 struct sctp_association *asoc;
1578 struct sk_buff *skb;
1581 /* Create the bare association. */
1582 scope = sctp_scope(sctp_source(chunk));
1583 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1588 /* Create an entry for the source address of the packet. */
1589 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1595 /* Build a cookie representing asoc.
1596 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1598 static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1599 const struct sctp_association *asoc,
1600 const struct sctp_chunk *init_chunk,
1602 const __u8 *raw_addrs, int addrs_len)
1604 sctp_cookie_param_t *retval;
1605 struct sctp_signed_cookie *cookie;
1606 int headersize, bodysize;
1608 /* Header size is static data prior to the actual cookie, including
1611 headersize = sizeof(struct sctp_paramhdr) +
1612 (sizeof(struct sctp_signed_cookie) -
1613 sizeof(struct sctp_cookie));
1614 bodysize = sizeof(struct sctp_cookie)
1615 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1617 /* Pad out the cookie to a multiple to make the signature
1618 * functions simpler to write.
1620 if (bodysize % SCTP_COOKIE_MULTIPLE)
1621 bodysize += SCTP_COOKIE_MULTIPLE
1622 - (bodysize % SCTP_COOKIE_MULTIPLE);
1623 *cookie_len = headersize + bodysize;
1625 /* Clear this memory since we are sending this data structure
1626 * out on the network.
1628 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1632 cookie = (struct sctp_signed_cookie *) retval->body;
1634 /* Set up the parameter header. */
1635 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1636 retval->p.length = htons(*cookie_len);
1638 /* Copy the cookie part of the association itself. */
1639 cookie->c = asoc->c;
1640 /* Save the raw address list length in the cookie. */
1641 cookie->c.raw_addr_list_len = addrs_len;
1643 /* Remember PR-SCTP capability. */
1644 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1646 /* Save adaptation indication in the cookie. */
1647 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1649 /* Set an expiration time for the cookie. */
1650 cookie->c.expiration = ktime_add(asoc->cookie_life,
1653 /* Copy the peer's init packet. */
1654 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1655 ntohs(init_chunk->chunk_hdr->length));
1657 /* Copy the raw local address list of the association. */
1658 memcpy((__u8 *)&cookie->c.peer_init[0] +
1659 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1661 if (sctp_sk(ep->base.sk)->hmac) {
1662 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1665 /* Sign the message. */
1666 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1669 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1670 sizeof(ep->secret_key)) ?:
1671 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1673 shash_desc_zero(desc);
1687 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1688 struct sctp_association *sctp_unpack_cookie(
1689 const struct sctp_endpoint *ep,
1690 const struct sctp_association *asoc,
1691 struct sctp_chunk *chunk, gfp_t gfp,
1692 int *error, struct sctp_chunk **errp)
1694 struct sctp_association *retval = NULL;
1695 struct sctp_signed_cookie *cookie;
1696 struct sctp_cookie *bear_cookie;
1697 int headersize, bodysize, fixed_size;
1698 __u8 *digest = ep->digest;
1701 struct sk_buff *skb = chunk->skb;
1704 /* Header size is static data prior to the actual cookie, including
1707 headersize = sizeof(struct sctp_chunkhdr) +
1708 (sizeof(struct sctp_signed_cookie) -
1709 sizeof(struct sctp_cookie));
1710 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1711 fixed_size = headersize + sizeof(struct sctp_cookie);
1713 /* Verify that the chunk looks like it even has a cookie.
1714 * There must be enough room for our cookie and our peer's
1717 len = ntohs(chunk->chunk_hdr->length);
1718 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1721 /* Verify that the cookie has been padded out. */
1722 if (bodysize % SCTP_COOKIE_MULTIPLE)
1725 /* Process the cookie. */
1726 cookie = chunk->subh.cookie_hdr;
1727 bear_cookie = &cookie->c;
1729 if (!sctp_sk(ep->base.sk)->hmac)
1732 /* Check the signature. */
1734 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1737 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1740 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1741 sizeof(ep->secret_key)) ?:
1742 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1744 shash_desc_zero(desc);
1747 *error = -SCTP_IERROR_NOMEM;
1752 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1753 *error = -SCTP_IERROR_BAD_SIG;
1758 /* IG Section 2.35.2:
1759 * 3) Compare the port numbers and the verification tag contained
1760 * within the COOKIE ECHO chunk to the actual port numbers and the
1761 * verification tag within the SCTP common header of the received
1762 * packet. If these values do not match the packet MUST be silently
1765 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1766 *error = -SCTP_IERROR_BAD_TAG;
1770 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1771 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1772 *error = -SCTP_IERROR_BAD_PORTS;
1776 /* Check to see if the cookie is stale. If there is already
1777 * an association, there is no need to check cookie's expiration
1778 * for init collision case of lost COOKIE ACK.
1779 * If skb has been timestamped, then use the stamp, otherwise
1780 * use current time. This introduces a small possibility that
1781 * that a cookie may be considered expired, but his would only slow
1782 * down the new association establishment instead of every packet.
1784 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1785 kt = skb_get_ktime(skb);
1787 kt = ktime_get_real();
1789 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
1791 * Section 3.3.10.3 Stale Cookie Error (3)
1795 * Stale Cookie Error: Indicates the receipt of a valid State
1796 * Cookie that has expired.
1798 len = ntohs(chunk->chunk_hdr->length);
1799 *errp = sctp_make_op_error_space(asoc, chunk, len);
1801 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1802 __be32 n = htonl(usecs);
1804 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
1806 sctp_addto_chunk(*errp, sizeof(n), &n);
1807 *error = -SCTP_IERROR_STALE_COOKIE;
1809 *error = -SCTP_IERROR_NOMEM;
1814 /* Make a new base association. */
1815 scope = sctp_scope(sctp_source(chunk));
1816 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1818 *error = -SCTP_IERROR_NOMEM;
1822 /* Set up our peer's port number. */
1823 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1825 /* Populate the association from the cookie. */
1826 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1828 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1830 *error = -SCTP_IERROR_NOMEM;
1834 /* Also, add the destination address. */
1835 if (list_empty(&retval->base.bind_addr.address_list)) {
1836 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1837 sizeof(chunk->dest), SCTP_ADDR_SRC,
1841 retval->next_tsn = retval->c.initial_tsn;
1842 retval->ctsn_ack_point = retval->next_tsn - 1;
1843 retval->addip_serial = retval->c.initial_tsn;
1844 retval->strreset_outseq = retval->c.initial_tsn;
1845 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1846 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1847 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1849 /* The INIT stuff will be done by the side effects. */
1854 sctp_association_free(retval);
1859 /* Yikes! The packet is either corrupt or deliberately
1862 *error = -SCTP_IERROR_MALFORMED;
1866 /********************************************************************
1867 * 3rd Level Abstractions
1868 ********************************************************************/
1870 struct __sctp_missing {
1876 * Report a missing mandatory parameter.
1878 static int sctp_process_missing_param(const struct sctp_association *asoc,
1879 enum sctp_param paramtype,
1880 struct sctp_chunk *chunk,
1881 struct sctp_chunk **errp)
1883 struct __sctp_missing report;
1886 len = SCTP_PAD4(sizeof(report));
1888 /* Make an ERROR chunk, preparing enough room for
1889 * returning multiple unknown parameters.
1892 *errp = sctp_make_op_error_space(asoc, chunk, len);
1895 report.num_missing = htonl(1);
1896 report.type = paramtype;
1897 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1899 sctp_addto_chunk(*errp, sizeof(report), &report);
1902 /* Stop processing this chunk. */
1906 /* Report an Invalid Mandatory Parameter. */
1907 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1908 struct sctp_chunk *chunk,
1909 struct sctp_chunk **errp)
1911 /* Invalid Mandatory Parameter Error has no payload. */
1914 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1917 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1919 /* Stop processing this chunk. */
1923 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1924 struct sctp_paramhdr *param,
1925 const struct sctp_chunk *chunk,
1926 struct sctp_chunk **errp)
1928 /* This is a fatal error. Any accumulated non-fatal errors are
1932 sctp_chunk_free(*errp);
1934 /* Create an error chunk and fill it in with our payload. */
1935 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1941 /* Do not attempt to handle the HOST_NAME parm. However, do
1942 * send back an indicator to the peer.
1944 static int sctp_process_hn_param(const struct sctp_association *asoc,
1945 union sctp_params param,
1946 struct sctp_chunk *chunk,
1947 struct sctp_chunk **errp)
1949 __u16 len = ntohs(param.p->length);
1951 /* Processing of the HOST_NAME parameter will generate an
1952 * ABORT. If we've accumulated any non-fatal errors, they
1953 * would be unrecognized parameters and we should not include
1954 * them in the ABORT.
1957 sctp_chunk_free(*errp);
1959 *errp = sctp_make_op_error_space(asoc, chunk, len);
1962 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1963 sctp_addto_chunk(*errp, len, param.v);
1966 /* Stop processing this chunk. */
1970 static int sctp_verify_ext_param(struct net *net, union sctp_params param)
1972 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
1974 int have_asconf = 0;
1977 for (i = 0; i < num_ext; i++) {
1978 switch (param.ext->chunks[i]) {
1982 case SCTP_CID_ASCONF:
1983 case SCTP_CID_ASCONF_ACK:
1989 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1990 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1991 * only if ADD-IP is turned on and we are not backward-compatible
1994 if (net->sctp.addip_noauth)
1997 if (net->sctp.addip_enable && !have_auth && have_asconf)
2003 static void sctp_process_ext_param(struct sctp_association *asoc,
2004 union sctp_params param)
2006 struct net *net = sock_net(asoc->base.sk);
2007 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2010 for (i = 0; i < num_ext; i++) {
2011 switch (param.ext->chunks[i]) {
2012 case SCTP_CID_RECONF:
2013 if (asoc->reconf_enable &&
2014 !asoc->peer.reconf_capable)
2015 asoc->peer.reconf_capable = 1;
2017 case SCTP_CID_FWD_TSN:
2018 if (asoc->prsctp_enable && !asoc->peer.prsctp_capable)
2019 asoc->peer.prsctp_capable = 1;
2022 /* if the peer reports AUTH, assume that he
2025 if (asoc->ep->auth_enable)
2026 asoc->peer.auth_capable = 1;
2028 case SCTP_CID_ASCONF:
2029 case SCTP_CID_ASCONF_ACK:
2030 if (net->sctp.addip_enable)
2031 asoc->peer.asconf_capable = 1;
2039 /* RFC 3.2.1 & the Implementers Guide 2.2.
2041 * The Parameter Types are encoded such that the
2042 * highest-order two bits specify the action that must be
2043 * taken if the processing endpoint does not recognize the
2046 * 00 - Stop processing this parameter; do not process any further
2047 * parameters within this chunk
2049 * 01 - Stop processing this parameter, do not process any further
2050 * parameters within this chunk, and report the unrecognized
2051 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2053 * 10 - Skip this parameter and continue processing.
2055 * 11 - Skip this parameter and continue processing but
2056 * report the unrecognized parameter in an
2057 * 'Unrecognized Parameter' ERROR chunk.
2060 * SCTP_IERROR_NO_ERROR - continue with the chunk
2061 * SCTP_IERROR_ERROR - stop and report an error.
2062 * SCTP_IERROR_NOMEME - out of memory.
2064 static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2065 union sctp_params param,
2066 struct sctp_chunk *chunk,
2067 struct sctp_chunk **errp)
2069 int retval = SCTP_IERROR_NO_ERROR;
2071 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2072 case SCTP_PARAM_ACTION_DISCARD:
2073 retval = SCTP_IERROR_ERROR;
2075 case SCTP_PARAM_ACTION_SKIP:
2077 case SCTP_PARAM_ACTION_DISCARD_ERR:
2078 retval = SCTP_IERROR_ERROR;
2080 case SCTP_PARAM_ACTION_SKIP_ERR:
2081 /* Make an ERROR chunk, preparing enough room for
2082 * returning multiple unknown parameters.
2085 *errp = sctp_make_op_error_fixed(asoc, chunk);
2088 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2089 SCTP_PAD4(ntohs(param.p->length))))
2090 sctp_addto_chunk_fixed(*errp,
2091 SCTP_PAD4(ntohs(param.p->length)),
2094 /* If there is no memory for generating the ERROR
2095 * report as specified, an ABORT will be triggered
2096 * to the peer and the association won't be
2099 retval = SCTP_IERROR_NOMEM;
2109 /* Verify variable length parameters
2111 * SCTP_IERROR_ABORT - trigger an ABORT
2112 * SCTP_IERROR_NOMEM - out of memory (abort)
2113 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2114 * SCTP_IERROR_NO_ERROR - continue with the chunk
2116 static sctp_ierror_t sctp_verify_param(struct net *net,
2117 const struct sctp_endpoint *ep,
2118 const struct sctp_association *asoc,
2119 union sctp_params param,
2121 struct sctp_chunk *chunk,
2122 struct sctp_chunk **err_chunk)
2124 struct sctp_hmac_algo_param *hmacs;
2125 int retval = SCTP_IERROR_NO_ERROR;
2126 __u16 n_elt, id = 0;
2129 /* FIXME - This routine is not looking at each parameter per the
2130 * chunk type, i.e., unrecognized parameters should be further
2131 * identified based on the chunk id.
2134 switch (param.p->type) {
2135 case SCTP_PARAM_IPV4_ADDRESS:
2136 case SCTP_PARAM_IPV6_ADDRESS:
2137 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2138 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2139 case SCTP_PARAM_STATE_COOKIE:
2140 case SCTP_PARAM_HEARTBEAT_INFO:
2141 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2142 case SCTP_PARAM_ECN_CAPABLE:
2143 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2146 case SCTP_PARAM_SUPPORTED_EXT:
2147 if (!sctp_verify_ext_param(net, param))
2148 return SCTP_IERROR_ABORT;
2151 case SCTP_PARAM_SET_PRIMARY:
2152 if (net->sctp.addip_enable)
2156 case SCTP_PARAM_HOST_NAME_ADDRESS:
2157 /* Tell the peer, we won't support this param. */
2158 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2159 retval = SCTP_IERROR_ABORT;
2162 case SCTP_PARAM_FWD_TSN_SUPPORT:
2163 if (ep->prsctp_enable)
2167 case SCTP_PARAM_RANDOM:
2168 if (!ep->auth_enable)
2171 /* SCTP-AUTH: Secion 6.1
2172 * If the random number is not 32 byte long the association
2173 * MUST be aborted. The ABORT chunk SHOULD contain the error
2174 * cause 'Protocol Violation'.
2176 if (SCTP_AUTH_RANDOM_LENGTH !=
2177 ntohs(param.p->length) - sizeof(struct sctp_paramhdr)) {
2178 sctp_process_inv_paramlength(asoc, param.p,
2180 retval = SCTP_IERROR_ABORT;
2184 case SCTP_PARAM_CHUNKS:
2185 if (!ep->auth_enable)
2188 /* SCTP-AUTH: Section 3.2
2189 * The CHUNKS parameter MUST be included once in the INIT or
2190 * INIT-ACK chunk if the sender wants to receive authenticated
2191 * chunks. Its maximum length is 260 bytes.
2193 if (260 < ntohs(param.p->length)) {
2194 sctp_process_inv_paramlength(asoc, param.p,
2196 retval = SCTP_IERROR_ABORT;
2200 case SCTP_PARAM_HMAC_ALGO:
2201 if (!ep->auth_enable)
2204 hmacs = (struct sctp_hmac_algo_param *)param.p;
2205 n_elt = (ntohs(param.p->length) -
2206 sizeof(struct sctp_paramhdr)) >> 1;
2208 /* SCTP-AUTH: Section 6.1
2209 * The HMAC algorithm based on SHA-1 MUST be supported and
2210 * included in the HMAC-ALGO parameter.
2212 for (i = 0; i < n_elt; i++) {
2213 id = ntohs(hmacs->hmac_ids[i]);
2215 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2219 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2220 sctp_process_inv_paramlength(asoc, param.p, chunk,
2222 retval = SCTP_IERROR_ABORT;
2227 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2228 __func__, ntohs(param.p->type), cid);
2230 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2236 /* Verify the INIT packet before we process it. */
2237 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2238 const struct sctp_association *asoc, enum sctp_cid cid,
2239 struct sctp_init_chunk *peer_init,
2240 struct sctp_chunk *chunk, struct sctp_chunk **errp)
2242 union sctp_params param;
2243 bool has_cookie = false;
2246 /* Check for missing mandatory parameters. Note: Initial TSN is
2247 * also mandatory, but is not checked here since the valid range
2248 * is 0..2**32-1. RFC4960, section 3.3.3.
2250 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2251 peer_init->init_hdr.num_inbound_streams == 0 ||
2252 peer_init->init_hdr.init_tag == 0 ||
2253 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2254 return sctp_process_inv_mandatory(asoc, chunk, errp);
2256 sctp_walk_params(param, peer_init, init_hdr.params) {
2257 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2261 /* There is a possibility that a parameter length was bad and
2262 * in that case we would have stoped walking the parameters.
2263 * The current param.p would point at the bad one.
2264 * Current consensus on the mailing list is to generate a PROTOCOL
2265 * VIOLATION error. We build the ERROR chunk here and let the normal
2266 * error handling code build and send the packet.
2268 if (param.v != (void *)chunk->chunk_end)
2269 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2271 /* The only missing mandatory param possible today is
2272 * the state cookie for an INIT-ACK chunk.
2274 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2275 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2278 /* Verify all the variable length parameters */
2279 sctp_walk_params(param, peer_init, init_hdr.params) {
2280 result = sctp_verify_param(net, ep, asoc, param, cid,
2283 case SCTP_IERROR_ABORT:
2284 case SCTP_IERROR_NOMEM:
2286 case SCTP_IERROR_ERROR:
2288 case SCTP_IERROR_NO_ERROR:
2293 } /* for (loop through all parameters) */
2298 /* Unpack the parameters in an INIT packet into an association.
2299 * Returns 0 on failure, else success.
2300 * FIXME: This is an association method.
2302 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2303 const union sctp_addr *peer_addr,
2304 struct sctp_init_chunk *peer_init, gfp_t gfp)
2306 struct net *net = sock_net(asoc->base.sk);
2307 union sctp_params param;
2308 struct sctp_transport *transport;
2309 struct list_head *pos, *temp;
2311 union sctp_addr addr;
2315 /* We must include the address that the INIT packet came from.
2316 * This is the only address that matters for an INIT packet.
2317 * When processing a COOKIE ECHO, we retrieve the from address
2318 * of the INIT from the cookie.
2321 /* This implementation defaults to making the first transport
2322 * added as the primary transport. The source address seems to
2323 * be a a better choice than any of the embedded addresses.
2325 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2328 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2331 /* Process the initialization parameters. */
2332 sctp_walk_params(param, peer_init, init_hdr.params) {
2333 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2334 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2335 af = sctp_get_af_specific(param_type2af(param.p->type));
2336 af->from_addr_param(&addr, param.addr,
2337 chunk->sctp_hdr->source, 0);
2338 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2342 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2346 /* source address of chunk may not match any valid address */
2350 /* AUTH: After processing the parameters, make sure that we
2351 * have all the required info to potentially do authentications.
2353 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2354 !asoc->peer.peer_hmacs))
2355 asoc->peer.auth_capable = 0;
2357 /* In a non-backward compatible mode, if the peer claims
2358 * support for ADD-IP but not AUTH, the ADD-IP spec states
2359 * that we MUST ABORT the association. Section 6. The section
2360 * also give us an option to silently ignore the packet, which
2361 * is what we'll do here.
2363 if (!net->sctp.addip_noauth &&
2364 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2365 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2367 SCTP_PARAM_SET_PRIMARY);
2368 asoc->peer.asconf_capable = 0;
2372 /* Walk list of transports, removing transports in the UNKNOWN state. */
2373 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2374 transport = list_entry(pos, struct sctp_transport, transports);
2375 if (transport->state == SCTP_UNKNOWN) {
2376 sctp_assoc_rm_peer(asoc, transport);
2380 /* The fixed INIT headers are always in network byte
2383 asoc->peer.i.init_tag =
2384 ntohl(peer_init->init_hdr.init_tag);
2385 asoc->peer.i.a_rwnd =
2386 ntohl(peer_init->init_hdr.a_rwnd);
2387 asoc->peer.i.num_outbound_streams =
2388 ntohs(peer_init->init_hdr.num_outbound_streams);
2389 asoc->peer.i.num_inbound_streams =
2390 ntohs(peer_init->init_hdr.num_inbound_streams);
2391 asoc->peer.i.initial_tsn =
2392 ntohl(peer_init->init_hdr.initial_tsn);
2394 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2396 /* Apply the upper bounds for output streams based on peer's
2397 * number of inbound streams.
2399 if (asoc->c.sinit_num_ostreams >
2400 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2401 asoc->c.sinit_num_ostreams =
2402 ntohs(peer_init->init_hdr.num_inbound_streams);
2405 if (asoc->c.sinit_max_instreams >
2406 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2407 asoc->c.sinit_max_instreams =
2408 ntohs(peer_init->init_hdr.num_outbound_streams);
2411 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2412 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2414 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2415 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2417 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2418 cookie = asoc->peer.cookie;
2420 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
2421 if (!asoc->peer.cookie)
2425 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2426 * high (for example, implementations MAY use the size of the receiver
2427 * advertised window).
2429 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2431 transport->ssthresh = asoc->peer.i.a_rwnd;
2434 /* Set up the TSN tracking pieces. */
2435 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2436 asoc->peer.i.initial_tsn, gfp))
2439 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2441 * The stream sequence number in all the streams shall start
2442 * from 0 when the association is established. Also, when the
2443 * stream sequence number reaches the value 65535 the next
2444 * stream sequence number shall be set to 0.
2447 if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
2448 asoc->c.sinit_max_instreams, gfp))
2451 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2454 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2456 * When an endpoint has an ASCONF signaled change to be sent to the
2457 * remote endpoint it should do the following:
2459 * A2) A serial number should be assigned to the Chunk. The serial
2460 * number should be a monotonically increasing number. All serial
2461 * numbers are defined to be initialized at the start of the
2462 * association to the same value as the Initial TSN.
2464 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2468 /* Release the transport structures. */
2469 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2470 transport = list_entry(pos, struct sctp_transport, transports);
2471 if (transport->state != SCTP_ACTIVE)
2472 sctp_assoc_rm_peer(asoc, transport);
2480 /* Update asoc with the option described in param.
2482 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2484 * asoc is the association to update.
2485 * param is the variable length parameter to use for update.
2486 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2487 * If the current packet is an INIT we want to minimize the amount of
2488 * work we do. In particular, we should not build transport
2489 * structures for the addresses.
2491 static int sctp_process_param(struct sctp_association *asoc,
2492 union sctp_params param,
2493 const union sctp_addr *peer_addr,
2496 struct net *net = sock_net(asoc->base.sk);
2497 union sctp_addr addr;
2504 union sctp_addr_param *addr_param;
2505 struct sctp_transport *t;
2506 struct sctp_endpoint *ep = asoc->ep;
2508 /* We maintain all INIT parameters in network byte order all the
2509 * time. This allows us to not worry about whether the parameters
2510 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2512 switch (param.p->type) {
2513 case SCTP_PARAM_IPV6_ADDRESS:
2514 if (PF_INET6 != asoc->base.sk->sk_family)
2518 case SCTP_PARAM_IPV4_ADDRESS:
2519 /* v4 addresses are not allowed on v6-only socket */
2520 if (ipv6_only_sock(asoc->base.sk))
2523 af = sctp_get_af_specific(param_type2af(param.p->type));
2524 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
2525 scope = sctp_scope(peer_addr);
2526 if (sctp_in_scope(net, &addr, scope))
2527 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2531 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2532 if (!net->sctp.cookie_preserve_enable)
2535 stale = ntohl(param.life->lifespan_increment);
2537 /* Suggested Cookie Life span increment's unit is msec,
2540 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2543 case SCTP_PARAM_HOST_NAME_ADDRESS:
2544 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2547 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2548 /* Turn off the default values first so we'll know which
2549 * ones are really set by the peer.
2551 asoc->peer.ipv4_address = 0;
2552 asoc->peer.ipv6_address = 0;
2554 /* Assume that peer supports the address family
2555 * by which it sends a packet.
2557 if (peer_addr->sa.sa_family == AF_INET6)
2558 asoc->peer.ipv6_address = 1;
2559 else if (peer_addr->sa.sa_family == AF_INET)
2560 asoc->peer.ipv4_address = 1;
2562 /* Cycle through address types; avoid divide by 0. */
2563 sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2565 sat /= sizeof(__u16);
2567 for (i = 0; i < sat; ++i) {
2568 switch (param.sat->types[i]) {
2569 case SCTP_PARAM_IPV4_ADDRESS:
2570 asoc->peer.ipv4_address = 1;
2573 case SCTP_PARAM_IPV6_ADDRESS:
2574 if (PF_INET6 == asoc->base.sk->sk_family)
2575 asoc->peer.ipv6_address = 1;
2578 case SCTP_PARAM_HOST_NAME_ADDRESS:
2579 asoc->peer.hostname_address = 1;
2582 default: /* Just ignore anything else. */
2588 case SCTP_PARAM_STATE_COOKIE:
2589 asoc->peer.cookie_len =
2590 ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2591 asoc->peer.cookie = param.cookie->body;
2594 case SCTP_PARAM_HEARTBEAT_INFO:
2595 /* Would be odd to receive, but it causes no problems. */
2598 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2599 /* Rejected during verify stage. */
2602 case SCTP_PARAM_ECN_CAPABLE:
2603 asoc->peer.ecn_capable = 1;
2606 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2607 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2610 case SCTP_PARAM_SET_PRIMARY:
2611 if (!net->sctp.addip_enable)
2614 addr_param = param.v + sizeof(sctp_addip_param_t);
2616 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2620 af->from_addr_param(&addr, addr_param,
2621 htons(asoc->peer.port), 0);
2623 /* if the address is invalid, we can't process it.
2624 * XXX: see spec for what to do.
2626 if (!af->addr_valid(&addr, NULL, NULL))
2629 t = sctp_assoc_lookup_paddr(asoc, &addr);
2633 sctp_assoc_set_primary(asoc, t);
2636 case SCTP_PARAM_SUPPORTED_EXT:
2637 sctp_process_ext_param(asoc, param);
2640 case SCTP_PARAM_FWD_TSN_SUPPORT:
2641 if (asoc->prsctp_enable) {
2642 asoc->peer.prsctp_capable = 1;
2648 case SCTP_PARAM_RANDOM:
2649 if (!ep->auth_enable)
2652 /* Save peer's random parameter */
2653 asoc->peer.peer_random = kmemdup(param.p,
2654 ntohs(param.p->length), gfp);
2655 if (!asoc->peer.peer_random) {
2661 case SCTP_PARAM_HMAC_ALGO:
2662 if (!ep->auth_enable)
2665 /* Save peer's HMAC list */
2666 asoc->peer.peer_hmacs = kmemdup(param.p,
2667 ntohs(param.p->length), gfp);
2668 if (!asoc->peer.peer_hmacs) {
2673 /* Set the default HMAC the peer requested*/
2674 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2677 case SCTP_PARAM_CHUNKS:
2678 if (!ep->auth_enable)
2681 asoc->peer.peer_chunks = kmemdup(param.p,
2682 ntohs(param.p->length), gfp);
2683 if (!asoc->peer.peer_chunks)
2688 /* Any unrecognized parameters should have been caught
2689 * and handled by sctp_verify_param() which should be
2690 * called prior to this routine. Simply log the error
2693 pr_debug("%s: ignoring param:%d for association:%p.\n",
2694 __func__, ntohs(param.p->type), asoc);
2701 /* Select a new verification tag. */
2702 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2704 /* I believe that this random number generator complies with RFC1750.
2705 * A tag of 0 is reserved for special cases (e.g. INIT).
2710 get_random_bytes(&x, sizeof(__u32));
2716 /* Select an initial TSN to send during startup. */
2717 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2721 get_random_bytes(&retval, sizeof(__u32));
2726 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2728 * 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
2729 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2730 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2731 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2733 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2734 * | Address Parameter |
2735 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2736 * | ASCONF Parameter #1 |
2737 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2741 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2742 * | ASCONF Parameter #N |
2743 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2745 * Address Parameter and other parameter will not be wrapped in this function
2747 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2748 union sctp_addr *addr,
2751 sctp_addiphdr_t asconf;
2752 struct sctp_chunk *retval;
2753 int length = sizeof(asconf) + vparam_len;
2754 union sctp_addr_param addrparam;
2756 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2758 addrlen = af->to_addr_param(addr, &addrparam);
2763 /* Create the chunk. */
2764 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2769 asconf.serial = htonl(asoc->addip_serial++);
2771 retval->subh.addip_hdr =
2772 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2773 retval->param_hdr.v =
2774 sctp_addto_chunk(retval, addrlen, &addrparam);
2780 * 3.2.1 Add IP Address
2782 * 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
2783 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2784 * | Type = 0xC001 | Length = Variable |
2785 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2786 * | ASCONF-Request Correlation ID |
2787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2788 * | Address Parameter |
2789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2791 * 3.2.2 Delete IP Address
2793 * 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
2794 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2795 * | Type = 0xC002 | Length = Variable |
2796 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2797 * | ASCONF-Request Correlation ID |
2798 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2799 * | Address Parameter |
2800 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2803 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2804 union sctp_addr *laddr,
2805 struct sockaddr *addrs,
2809 sctp_addip_param_t param;
2810 struct sctp_chunk *retval;
2811 union sctp_addr_param addr_param;
2812 union sctp_addr *addr;
2815 int paramlen = sizeof(param);
2816 int addr_param_len = 0;
2821 /* Get total length of all the address parameters. */
2823 for (i = 0; i < addrcnt; i++) {
2825 af = sctp_get_af_specific(addr->v4.sin_family);
2826 addr_param_len = af->to_addr_param(addr, &addr_param);
2828 totallen += paramlen;
2829 totallen += addr_param_len;
2831 addr_buf += af->sockaddr_len;
2832 if (asoc->asconf_addr_del_pending && !del_pickup) {
2833 /* reuse the parameter length from the same scope one */
2834 totallen += paramlen;
2835 totallen += addr_param_len;
2838 pr_debug("%s: picked same-scope del_pending addr, "
2839 "totallen for all addresses is %d\n",
2840 __func__, totallen);
2844 /* Create an asconf chunk with the required length. */
2845 retval = sctp_make_asconf(asoc, laddr, totallen);
2849 /* Add the address parameters to the asconf chunk. */
2851 for (i = 0; i < addrcnt; i++) {
2853 af = sctp_get_af_specific(addr->v4.sin_family);
2854 addr_param_len = af->to_addr_param(addr, &addr_param);
2855 param.param_hdr.type = flags;
2856 param.param_hdr.length = htons(paramlen + addr_param_len);
2859 sctp_addto_chunk(retval, paramlen, ¶m);
2860 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2862 addr_buf += af->sockaddr_len;
2864 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2865 addr = asoc->asconf_addr_del_pending;
2866 af = sctp_get_af_specific(addr->v4.sin_family);
2867 addr_param_len = af->to_addr_param(addr, &addr_param);
2868 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2869 param.param_hdr.length = htons(paramlen + addr_param_len);
2872 sctp_addto_chunk(retval, paramlen, ¶m);
2873 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2879 * 3.2.4 Set Primary IP Address
2881 * 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
2882 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2883 * | Type =0xC004 | Length = Variable |
2884 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2885 * | ASCONF-Request Correlation ID |
2886 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2887 * | Address Parameter |
2888 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2890 * Create an ASCONF chunk with Set Primary IP address parameter.
2892 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2893 union sctp_addr *addr)
2895 sctp_addip_param_t param;
2896 struct sctp_chunk *retval;
2897 int len = sizeof(param);
2898 union sctp_addr_param addrparam;
2900 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2902 addrlen = af->to_addr_param(addr, &addrparam);
2907 /* Create the chunk and make asconf header. */
2908 retval = sctp_make_asconf(asoc, addr, len);
2912 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2913 param.param_hdr.length = htons(len);
2916 sctp_addto_chunk(retval, sizeof(param), ¶m);
2917 sctp_addto_chunk(retval, addrlen, &addrparam);
2922 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2924 * 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
2925 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2926 * | Type = 0x80 | Chunk Flags | Chunk Length |
2927 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2929 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2930 * | ASCONF Parameter Response#1 |
2931 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2935 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2936 * | ASCONF Parameter Response#N |
2937 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2939 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2941 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2942 __u32 serial, int vparam_len)
2944 sctp_addiphdr_t asconf;
2945 struct sctp_chunk *retval;
2946 int length = sizeof(asconf) + vparam_len;
2948 /* Create the chunk. */
2949 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2954 asconf.serial = htonl(serial);
2956 retval->subh.addip_hdr =
2957 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2962 /* Add response parameters to an ASCONF_ACK chunk. */
2963 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2964 __be16 err_code, sctp_addip_param_t *asconf_param)
2966 sctp_addip_param_t ack_param;
2967 sctp_errhdr_t err_param;
2968 int asconf_param_len = 0;
2969 int err_param_len = 0;
2970 __be16 response_type;
2972 if (SCTP_ERROR_NO_ERROR == err_code) {
2973 response_type = SCTP_PARAM_SUCCESS_REPORT;
2975 response_type = SCTP_PARAM_ERR_CAUSE;
2976 err_param_len = sizeof(err_param);
2979 ntohs(asconf_param->param_hdr.length);
2982 /* Add Success Indication or Error Cause Indication parameter. */
2983 ack_param.param_hdr.type = response_type;
2984 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2987 ack_param.crr_id = crr_id;
2988 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2990 if (SCTP_ERROR_NO_ERROR == err_code)
2993 /* Add Error Cause parameter. */
2994 err_param.cause = err_code;
2995 err_param.length = htons(err_param_len + asconf_param_len);
2996 sctp_addto_chunk(chunk, err_param_len, &err_param);
2998 /* Add the failed TLV copied from ASCONF chunk. */
3000 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3003 /* Process a asconf parameter. */
3004 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3005 struct sctp_chunk *asconf,
3006 sctp_addip_param_t *asconf_param)
3008 struct sctp_transport *peer;
3010 union sctp_addr addr;
3011 union sctp_addr_param *addr_param;
3013 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
3015 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3016 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3017 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3018 return SCTP_ERROR_UNKNOWN_PARAM;
3020 switch (addr_param->p.type) {
3021 case SCTP_PARAM_IPV6_ADDRESS:
3022 if (!asoc->peer.ipv6_address)
3023 return SCTP_ERROR_DNS_FAILED;
3025 case SCTP_PARAM_IPV4_ADDRESS:
3026 if (!asoc->peer.ipv4_address)
3027 return SCTP_ERROR_DNS_FAILED;
3030 return SCTP_ERROR_DNS_FAILED;
3033 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3035 return SCTP_ERROR_DNS_FAILED;
3037 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
3039 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3040 * or multicast address.
3041 * (note: wildcard is permitted and requires special handling so
3042 * make sure we check for that)
3044 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3045 return SCTP_ERROR_DNS_FAILED;
3047 switch (asconf_param->param_hdr.type) {
3048 case SCTP_PARAM_ADD_IP:
3050 * If the address 0.0.0.0 or ::0 is provided, the source
3051 * address of the packet MUST be added.
3053 if (af->is_any(&addr))
3054 memcpy(&addr, &asconf->source, sizeof(addr));
3056 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3057 * request and does not have the local resources to add this
3058 * new address to the association, it MUST return an Error
3059 * Cause TLV set to the new error code 'Operation Refused
3060 * Due to Resource Shortage'.
3063 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3065 return SCTP_ERROR_RSRC_LOW;
3067 /* Start the heartbeat timer. */
3068 sctp_transport_reset_hb_timer(peer);
3069 asoc->new_transport = peer;
3071 case SCTP_PARAM_DEL_IP:
3072 /* ADDIP 4.3 D7) If a request is received to delete the
3073 * last remaining IP address of a peer endpoint, the receiver
3074 * MUST send an Error Cause TLV with the error cause set to the
3075 * new error code 'Request to Delete Last Remaining IP Address'.
3077 if (asoc->peer.transport_count == 1)
3078 return SCTP_ERROR_DEL_LAST_IP;
3080 /* ADDIP 4.3 D8) If a request is received to delete an IP
3081 * address which is also the source address of the IP packet
3082 * which contained the ASCONF chunk, the receiver MUST reject
3083 * this request. To reject the request the receiver MUST send
3084 * an Error Cause TLV set to the new error code 'Request to
3085 * Delete Source IP Address'
3087 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3088 return SCTP_ERROR_DEL_SRC_IP;
3091 * If the address 0.0.0.0 or ::0 is provided, all
3092 * addresses of the peer except the source address of the
3093 * packet MUST be deleted.
3095 if (af->is_any(&addr)) {
3096 sctp_assoc_set_primary(asoc, asconf->transport);
3097 sctp_assoc_del_nonprimary_peers(asoc,
3099 return SCTP_ERROR_NO_ERROR;
3102 /* If the address is not part of the association, the
3103 * ASCONF-ACK with Error Cause Indication Parameter
3104 * which including cause of Unresolvable Address should
3107 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3109 return SCTP_ERROR_DNS_FAILED;
3111 sctp_assoc_rm_peer(asoc, peer);
3113 case SCTP_PARAM_SET_PRIMARY:
3114 /* ADDIP Section 4.2.4
3115 * If the address 0.0.0.0 or ::0 is provided, the receiver
3116 * MAY mark the source address of the packet as its
3119 if (af->is_any(&addr))
3120 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3122 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3124 return SCTP_ERROR_DNS_FAILED;
3126 sctp_assoc_set_primary(asoc, peer);
3130 return SCTP_ERROR_NO_ERROR;
3133 /* Verify the ASCONF packet before we process it. */
3134 bool sctp_verify_asconf(const struct sctp_association *asoc,
3135 struct sctp_chunk *chunk, bool addr_param_needed,
3136 struct sctp_paramhdr **errp)
3138 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr;
3139 union sctp_params param;
3140 bool addr_param_seen = false;
3142 sctp_walk_params(param, addip, addip_hdr.params) {
3143 size_t length = ntohs(param.p->length);
3146 switch (param.p->type) {
3147 case SCTP_PARAM_ERR_CAUSE:
3149 case SCTP_PARAM_IPV4_ADDRESS:
3150 if (length != sizeof(struct sctp_ipv4addr_param))
3152 /* ensure there is only one addr param and it's in the
3153 * beginning of addip_hdr params, or we reject it.
3155 if (param.v != addip->addip_hdr.params)
3157 addr_param_seen = true;
3159 case SCTP_PARAM_IPV6_ADDRESS:
3160 if (length != sizeof(struct sctp_ipv6addr_param))
3162 if (param.v != addip->addip_hdr.params)
3164 addr_param_seen = true;
3166 case SCTP_PARAM_ADD_IP:
3167 case SCTP_PARAM_DEL_IP:
3168 case SCTP_PARAM_SET_PRIMARY:
3169 /* In ASCONF chunks, these need to be first. */
3170 if (addr_param_needed && !addr_param_seen)
3172 length = ntohs(param.addip->param_hdr.length);
3173 if (length < sizeof(sctp_addip_param_t) +
3177 case SCTP_PARAM_SUCCESS_REPORT:
3178 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3179 if (length != sizeof(sctp_addip_param_t))
3183 /* This is unkown to us, reject! */
3188 /* Remaining sanity checks. */
3189 if (addr_param_needed && !addr_param_seen)
3191 if (!addr_param_needed && addr_param_seen)
3193 if (param.v != chunk->chunk_end)
3199 /* Process an incoming ASCONF chunk with the next expected serial no. and
3200 * return an ASCONF_ACK chunk to be sent in response.
3202 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3203 struct sctp_chunk *asconf)
3205 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr;
3206 bool all_param_pass = true;
3207 union sctp_params param;
3208 sctp_addiphdr_t *hdr;
3209 union sctp_addr_param *addr_param;
3210 struct sctp_chunk *asconf_ack;
3216 chunk_len = ntohs(asconf->chunk_hdr->length) -
3217 sizeof(struct sctp_chunkhdr);
3218 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3219 serial = ntohl(hdr->serial);
3221 /* Skip the addiphdr and store a pointer to address parameter. */
3222 length = sizeof(sctp_addiphdr_t);
3223 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3224 chunk_len -= length;
3226 /* Skip the address parameter and store a pointer to the first
3229 length = ntohs(addr_param->p.length);
3230 chunk_len -= length;
3232 /* create an ASCONF_ACK chunk.
3233 * Based on the definitions of parameters, we know that the size of
3234 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3237 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3241 /* Process the TLVs contained within the ASCONF chunk. */
3242 sctp_walk_params(param, addip, addip_hdr.params) {
3243 /* Skip preceeding address parameters. */
3244 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3245 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3248 err_code = sctp_process_asconf_param(asoc, asconf,
3251 * If an error response is received for a TLV parameter,
3252 * all TLVs with no response before the failed TLV are
3253 * considered successful if not reported. All TLVs after
3254 * the failed response are considered unsuccessful unless
3255 * a specific success indication is present for the parameter.
3257 if (err_code != SCTP_ERROR_NO_ERROR)
3258 all_param_pass = false;
3259 if (!all_param_pass)
3260 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3261 err_code, param.addip);
3263 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3264 * an IP address sends an 'Out of Resource' in its response, it
3265 * MUST also fail any subsequent add or delete requests bundled
3268 if (err_code == SCTP_ERROR_RSRC_LOW)
3272 asoc->peer.addip_serial++;
3274 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3275 * after freeing the reference to old asconf ack if any.
3278 sctp_chunk_hold(asconf_ack);
3279 list_add_tail(&asconf_ack->transmitted_list,
3280 &asoc->asconf_ack_list);
3286 /* Process a asconf parameter that is successfully acked. */
3287 static void sctp_asconf_param_success(struct sctp_association *asoc,
3288 sctp_addip_param_t *asconf_param)
3291 union sctp_addr addr;
3292 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3293 union sctp_addr_param *addr_param;
3294 struct sctp_transport *transport;
3295 struct sctp_sockaddr_entry *saddr;
3297 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
3299 /* We have checked the packet before, so we do not check again. */
3300 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3301 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
3303 switch (asconf_param->param_hdr.type) {
3304 case SCTP_PARAM_ADD_IP:
3305 /* This is always done in BH context with a socket lock
3306 * held, so the list can not change.
3309 list_for_each_entry(saddr, &bp->address_list, list) {
3310 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3311 saddr->state = SCTP_ADDR_SRC;
3314 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3316 sctp_transport_dst_release(transport);
3319 case SCTP_PARAM_DEL_IP:
3321 sctp_del_bind_addr(bp, &addr);
3322 if (asoc->asconf_addr_del_pending != NULL &&
3323 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3324 kfree(asoc->asconf_addr_del_pending);
3325 asoc->asconf_addr_del_pending = NULL;
3328 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3330 sctp_transport_dst_release(transport);
3338 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3339 * for the given asconf parameter. If there is no response for this parameter,
3340 * return the error code based on the third argument 'no_err'.
3342 * A7) If an error response is received for a TLV parameter, all TLVs with no
3343 * response before the failed TLV are considered successful if not reported.
3344 * All TLVs after the failed response are considered unsuccessful unless a
3345 * specific success indication is present for the parameter.
3347 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3348 sctp_addip_param_t *asconf_param,
3351 sctp_addip_param_t *asconf_ack_param;
3352 sctp_errhdr_t *err_param;
3358 err_code = SCTP_ERROR_NO_ERROR;
3360 err_code = SCTP_ERROR_REQ_REFUSED;
3362 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3363 sizeof(struct sctp_chunkhdr);
3365 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3366 * the first asconf_ack parameter.
3368 length = sizeof(sctp_addiphdr_t);
3369 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3371 asconf_ack_len -= length;
3373 while (asconf_ack_len > 0) {
3374 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3375 switch (asconf_ack_param->param_hdr.type) {
3376 case SCTP_PARAM_SUCCESS_REPORT:
3377 return SCTP_ERROR_NO_ERROR;
3378 case SCTP_PARAM_ERR_CAUSE:
3379 length = sizeof(sctp_addip_param_t);
3380 err_param = (void *)asconf_ack_param + length;
3381 asconf_ack_len -= length;
3382 if (asconf_ack_len > 0)
3383 return err_param->cause;
3385 return SCTP_ERROR_INV_PARAM;
3388 return SCTP_ERROR_INV_PARAM;
3392 length = ntohs(asconf_ack_param->param_hdr.length);
3393 asconf_ack_param = (void *)asconf_ack_param + length;
3394 asconf_ack_len -= length;
3400 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3401 int sctp_process_asconf_ack(struct sctp_association *asoc,
3402 struct sctp_chunk *asconf_ack)
3404 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3405 union sctp_addr_param *addr_param;
3406 sctp_addip_param_t *asconf_param;
3408 int asconf_len = asconf->skb->len;
3409 int all_param_pass = 0;
3412 __be16 err_code = SCTP_ERROR_NO_ERROR;
3414 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3415 * a pointer to address parameter.
3417 length = sizeof(sctp_addip_chunk_t);
3418 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3419 asconf_len -= length;
3421 /* Skip the address parameter in the last asconf sent and store a
3422 * pointer to the first asconf parameter.
3424 length = ntohs(addr_param->p.length);
3425 asconf_param = (void *)addr_param + length;
3426 asconf_len -= length;
3429 * A8) If there is no response(s) to specific TLV parameter(s), and no
3430 * failures are indicated, then all request(s) are considered
3433 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3436 /* Process the TLVs contained in the last sent ASCONF chunk. */
3437 while (asconf_len > 0) {
3439 err_code = SCTP_ERROR_NO_ERROR;
3441 err_code = sctp_get_asconf_response(asconf_ack,
3444 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3449 case SCTP_ERROR_NO_ERROR:
3450 sctp_asconf_param_success(asoc, asconf_param);
3453 case SCTP_ERROR_RSRC_LOW:
3457 case SCTP_ERROR_UNKNOWN_PARAM:
3458 /* Disable sending this type of asconf parameter in
3461 asoc->peer.addip_disabled_mask |=
3462 asconf_param->param_hdr.type;
3465 case SCTP_ERROR_REQ_REFUSED:
3466 case SCTP_ERROR_DEL_LAST_IP:
3467 case SCTP_ERROR_DEL_SRC_IP:
3472 /* Skip the processed asconf parameter and move to the next
3475 length = ntohs(asconf_param->param_hdr.length);
3476 asconf_param = (void *)asconf_param + length;
3477 asconf_len -= length;
3480 if (no_err && asoc->src_out_of_asoc_ok) {
3481 asoc->src_out_of_asoc_ok = 0;
3482 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3485 /* Free the cached last sent asconf chunk. */
3486 list_del_init(&asconf->transmitted_list);
3487 sctp_chunk_free(asconf);
3488 asoc->addip_last_asconf = NULL;
3493 /* Make a FWD TSN chunk. */
3494 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3495 __u32 new_cum_tsn, size_t nstreams,
3496 struct sctp_fwdtsn_skip *skiplist)
3498 struct sctp_chunk *retval = NULL;
3499 struct sctp_fwdtsn_hdr ftsn_hdr;
3500 struct sctp_fwdtsn_skip skip;
3504 hint = (nstreams + 1) * sizeof(__u32);
3506 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3511 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3512 retval->subh.fwdtsn_hdr =
3513 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3515 for (i = 0; i < nstreams; i++) {
3516 skip.stream = skiplist[i].stream;
3517 skip.ssn = skiplist[i].ssn;
3518 sctp_addto_chunk(retval, sizeof(skip), &skip);
3524 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3526 * 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
3527 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3528 * | Type = 130 | Chunk Flags | Chunk Length |
3529 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3531 * / Re-configuration Parameter /
3533 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3535 * / Re-configuration Parameter (optional) /
3537 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3539 static struct sctp_chunk *sctp_make_reconf(
3540 const struct sctp_association *asoc,
3543 struct sctp_reconf_chunk *reconf;
3544 struct sctp_chunk *retval;
3546 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3551 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3552 retval->param_hdr.v = reconf->params;
3557 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3559 * 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
3560 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3561 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3562 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3563 * | Re-configuration Request Sequence Number |
3564 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3565 * | Re-configuration Response Sequence Number |
3566 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3567 * | Sender's Last Assigned TSN |
3568 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3569 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3570 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3572 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3573 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3574 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3576 * RE-CONFIG 4.2 (STREAM IN RESET)
3578 * 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
3579 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3580 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3581 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3582 * | Re-configuration Request Sequence Number |
3583 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3584 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3587 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3588 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3589 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3591 struct sctp_chunk *sctp_make_strreset_req(
3592 const struct sctp_association *asoc,
3593 __u16 stream_num, __u16 *stream_list,
3596 struct sctp_strreset_outreq outreq;
3597 __u16 stream_len = stream_num * 2;
3598 struct sctp_strreset_inreq inreq;
3599 struct sctp_chunk *retval;
3600 __u16 outlen, inlen;
3602 outlen = (sizeof(outreq) + stream_len) * out;
3603 inlen = (sizeof(inreq) + stream_len) * in;
3605 retval = sctp_make_reconf(asoc, outlen + inlen);
3610 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3611 outreq.param_hdr.length = htons(outlen);
3612 outreq.request_seq = htonl(asoc->strreset_outseq);
3613 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3614 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3616 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3619 sctp_addto_chunk(retval, stream_len, stream_list);
3623 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3624 inreq.param_hdr.length = htons(inlen);
3625 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3627 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3630 sctp_addto_chunk(retval, stream_len, stream_list);
3636 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3638 * 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
3639 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3640 * | Parameter Type = 15 | Parameter Length = 8 |
3641 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3642 * | Re-configuration Request Sequence Number |
3643 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3645 struct sctp_chunk *sctp_make_strreset_tsnreq(
3646 const struct sctp_association *asoc)
3648 struct sctp_strreset_tsnreq tsnreq;
3649 __u16 length = sizeof(tsnreq);
3650 struct sctp_chunk *retval;
3652 retval = sctp_make_reconf(asoc, length);
3656 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3657 tsnreq.param_hdr.length = htons(length);
3658 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3660 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3665 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3667 * 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
3668 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3669 * | Parameter Type = 17 | Parameter Length = 12 |
3670 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3671 * | Re-configuration Request Sequence Number |
3672 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3673 * | Number of new streams | Reserved |
3674 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3676 struct sctp_chunk *sctp_make_strreset_addstrm(
3677 const struct sctp_association *asoc,
3678 __u16 out, __u16 in)
3680 struct sctp_strreset_addstrm addstrm;
3681 __u16 size = sizeof(addstrm);
3682 struct sctp_chunk *retval;
3684 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3689 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3690 addstrm.param_hdr.length = htons(size);
3691 addstrm.number_of_streams = htons(out);
3692 addstrm.request_seq = htonl(asoc->strreset_outseq);
3693 addstrm.reserved = 0;
3695 sctp_addto_chunk(retval, size, &addstrm);
3699 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3700 addstrm.param_hdr.length = htons(size);
3701 addstrm.number_of_streams = htons(in);
3702 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3703 addstrm.reserved = 0;
3705 sctp_addto_chunk(retval, size, &addstrm);
3711 /* RE-CONFIG 4.4 (RESP)
3713 * 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
3714 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3715 * | Parameter Type = 16 | Parameter Length |
3716 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3717 * | Re-configuration Response Sequence Number |
3718 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3720 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3722 struct sctp_chunk *sctp_make_strreset_resp(
3723 const struct sctp_association *asoc,
3724 __u32 result, __u32 sn)
3726 struct sctp_strreset_resp resp;
3727 __u16 length = sizeof(resp);
3728 struct sctp_chunk *retval;
3730 retval = sctp_make_reconf(asoc, length);
3734 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3735 resp.param_hdr.length = htons(length);
3736 resp.response_seq = htonl(sn);
3737 resp.result = htonl(result);
3739 sctp_addto_chunk(retval, sizeof(resp), &resp);
3744 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3746 * 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
3747 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3748 * | Parameter Type = 16 | Parameter Length |
3749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3750 * | Re-configuration Response Sequence Number |
3751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3754 * | Sender's Next TSN (optional) |
3755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3756 * | Receiver's Next TSN (optional) |
3757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3759 struct sctp_chunk *sctp_make_strreset_tsnresp(
3760 struct sctp_association *asoc,
3761 __u32 result, __u32 sn,
3762 __u32 sender_tsn, __u32 receiver_tsn)
3764 struct sctp_strreset_resptsn tsnresp;
3765 __u16 length = sizeof(tsnresp);
3766 struct sctp_chunk *retval;
3768 retval = sctp_make_reconf(asoc, length);
3772 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3773 tsnresp.param_hdr.length = htons(length);
3775 tsnresp.response_seq = htonl(sn);
3776 tsnresp.result = htonl(result);
3777 tsnresp.senders_next_tsn = htonl(sender_tsn);
3778 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3780 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3785 bool sctp_verify_reconf(const struct sctp_association *asoc,
3786 struct sctp_chunk *chunk,
3787 struct sctp_paramhdr **errp)
3789 struct sctp_reconf_chunk *hdr;
3790 union sctp_params param;
3791 __u16 last = 0, cnt = 0;
3793 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3794 sctp_walk_params(param, hdr, params) {
3795 __u16 length = ntohs(param.p->length);
3800 switch (param.p->type) {
3801 case SCTP_PARAM_RESET_OUT_REQUEST:
3802 if (length < sizeof(struct sctp_strreset_outreq) ||
3803 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3804 last != SCTP_PARAM_RESET_IN_REQUEST))
3807 case SCTP_PARAM_RESET_IN_REQUEST:
3808 if (length < sizeof(struct sctp_strreset_inreq) ||
3809 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3812 case SCTP_PARAM_RESET_RESPONSE:
3813 if ((length != sizeof(struct sctp_strreset_resp) &&
3814 length != sizeof(struct sctp_strreset_resptsn)) ||
3815 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3816 last != SCTP_PARAM_RESET_OUT_REQUEST))
3819 case SCTP_PARAM_RESET_TSN_REQUEST:
3821 sizeof(struct sctp_strreset_tsnreq) || last)
3824 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3825 if (length != sizeof(struct sctp_strreset_addstrm) ||
3826 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3829 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3830 if (length != sizeof(struct sctp_strreset_addstrm) ||
3831 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3838 last = param.p->type;