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 struct sctp_cookie_param *sctp_pack_cookie(
73 const struct sctp_endpoint *ep,
74 const struct sctp_association *asoc,
75 const struct sctp_chunk *init_chunk,
77 const __u8 *raw_addrs, int addrs_len);
78 static int sctp_process_param(struct sctp_association *asoc,
79 union sctp_params param,
80 const union sctp_addr *peer_addr,
82 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
84 static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len,
87 /* Control chunk destructor */
88 static void sctp_control_release_owner(struct sk_buff *skb)
90 /*TODO: do memory release */
93 static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
95 struct sctp_association *asoc = chunk->asoc;
96 struct sk_buff *skb = chunk->skb;
98 /* TODO: properly account for control chunks.
99 * To do it right we'll need:
100 * 1) endpoint if association isn't known.
101 * 2) proper memory accounting.
103 * For now don't do anything for now.
105 skb->sk = asoc ? asoc->base.sk : NULL;
106 skb->destructor = sctp_control_release_owner;
109 /* What was the inbound interface for this chunk? */
110 int sctp_chunk_iif(const struct sctp_chunk *chunk)
112 struct sk_buff *skb = chunk->skb;
114 return SCTP_INPUT_CB(skb)->af->skb_iif(skb);
117 /* RFC 2960 3.3.2 Initiation (INIT) (1)
119 * Note 2: The ECN capable field is reserved for future use of
120 * Explicit Congestion Notification.
122 static const struct sctp_paramhdr ecap_param = {
123 SCTP_PARAM_ECN_CAPABLE,
124 cpu_to_be16(sizeof(struct sctp_paramhdr)),
126 static const struct sctp_paramhdr prsctp_param = {
127 SCTP_PARAM_FWD_TSN_SUPPORT,
128 cpu_to_be16(sizeof(struct sctp_paramhdr)),
131 /* A helper to initialize an op error inside a
132 * provided chunk, as most cause codes will be embedded inside an
135 void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
138 struct sctp_errhdr err;
141 /* Cause code constants are now defined in network order. */
142 err.cause = cause_code;
143 len = sizeof(err) + paylen;
144 err.length = htons(len);
145 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err);
148 /* A helper to initialize an op error inside a
149 * provided chunk, as most cause codes will be embedded inside an
150 * abort chunk. Differs from sctp_init_cause in that it won't oops
151 * if there isn't enough space in the op error chunk
153 static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
156 struct sctp_errhdr err;
159 /* Cause code constants are now defined in network order. */
160 err.cause = cause_code;
161 len = sizeof(err) + paylen;
162 err.length = htons(len);
164 if (skb_tailroom(chunk->skb) < len)
167 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, sizeof(err), &err);
171 /* 3.3.2 Initiation (INIT) (1)
173 * This chunk is used to initiate a SCTP association between two
174 * endpoints. The format of the INIT chunk is shown below:
177 * 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
178 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
179 * | Type = 1 | Chunk Flags | Chunk Length |
180 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
182 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
183 * | Advertised Receiver Window Credit (a_rwnd) |
184 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
185 * | Number of Outbound Streams | Number of Inbound Streams |
186 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
188 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
190 * / Optional/Variable-Length Parameters /
192 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
195 * The INIT chunk contains the following parameters. Unless otherwise
196 * noted, each parameter MUST only be included once in the INIT chunk.
198 * Fixed Parameters Status
199 * ----------------------------------------------
200 * Initiate Tag Mandatory
201 * Advertised Receiver Window Credit Mandatory
202 * Number of Outbound Streams Mandatory
203 * Number of Inbound Streams Mandatory
204 * Initial TSN Mandatory
206 * Variable Parameters Status Type Value
207 * -------------------------------------------------------------
208 * IPv4 Address (Note 1) Optional 5
209 * IPv6 Address (Note 1) Optional 6
210 * Cookie Preservative Optional 9
211 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
212 * Host Name Address (Note 3) Optional 11
213 * Supported Address Types (Note 4) Optional 12
215 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
216 const struct sctp_bind_addr *bp,
217 gfp_t gfp, int vparam_len)
219 struct net *net = sock_net(asoc->base.sk);
220 struct sctp_endpoint *ep = asoc->ep;
221 struct sctp_inithdr init;
222 union sctp_params addrs;
224 struct sctp_chunk *retval = NULL;
225 int num_types, addrs_len = 0;
226 struct sctp_sock *sp;
227 struct sctp_supported_addrs_param sat;
229 struct sctp_adaptation_ind_param aiparam;
230 struct sctp_supported_ext_param ext_param;
233 struct sctp_paramhdr *auth_chunks = NULL,
236 /* RFC 2960 3.3.2 Initiation (INIT) (1)
238 * Note 1: The INIT chunks can contain multiple addresses that
239 * can be IPv4 and/or IPv6 in any combination.
243 /* Convert the provided bind address list to raw format. */
244 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
246 init.init_tag = htonl(asoc->c.my_vtag);
247 init.a_rwnd = htonl(asoc->rwnd);
248 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
249 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
250 init.initial_tsn = htonl(asoc->c.initial_tsn);
252 /* How many address types are needed? */
253 sp = sctp_sk(asoc->base.sk);
254 num_types = sp->pf->supported_addrs(sp, types);
256 chunksize = sizeof(init) + addrs_len;
257 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
258 chunksize += sizeof(ecap_param);
260 if (asoc->prsctp_enable)
261 chunksize += sizeof(prsctp_param);
263 /* ADDIP: Section 4.2.7:
264 * An implementation supporting this extension [ADDIP] MUST list
265 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
266 * INIT-ACK parameters.
268 if (net->sctp.addip_enable) {
269 extensions[num_ext] = SCTP_CID_ASCONF;
270 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
274 if (asoc->reconf_enable) {
275 extensions[num_ext] = SCTP_CID_RECONF;
279 if (sp->adaptation_ind)
280 chunksize += sizeof(aiparam);
282 chunksize += vparam_len;
284 /* Account for AUTH related parameters */
285 if (ep->auth_enable) {
286 /* Add random parameter length*/
287 chunksize += sizeof(asoc->c.auth_random);
289 /* Add HMACS parameter length if any were defined */
290 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
291 if (auth_hmacs->length)
292 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
296 /* Add CHUNKS parameter length */
297 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
298 if (auth_chunks->length)
299 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
303 extensions[num_ext] = SCTP_CID_AUTH;
307 /* If we have any extensions to report, account for that */
309 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
311 /* RFC 2960 3.3.2 Initiation (INIT) (1)
313 * Note 3: An INIT chunk MUST NOT contain more than one Host
314 * Name address parameter. Moreover, the sender of the INIT
315 * MUST NOT combine any other address types with the Host Name
316 * address in the INIT. The receiver of INIT MUST ignore any
317 * other address types if the Host Name address parameter is
318 * present in the received INIT chunk.
320 * PLEASE DO NOT FIXME [This version does not support Host Name.]
323 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
327 retval->subh.init_hdr =
328 sctp_addto_chunk(retval, sizeof(init), &init);
329 retval->param_hdr.v =
330 sctp_addto_chunk(retval, addrs_len, addrs.v);
332 /* RFC 2960 3.3.2 Initiation (INIT) (1)
334 * Note 4: This parameter, when present, specifies all the
335 * address types the sending endpoint can support. The absence
336 * of this parameter indicates that the sending endpoint can
337 * support any address type.
339 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
340 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
341 sctp_addto_chunk(retval, sizeof(sat), &sat);
342 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
344 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
346 /* Add the supported extensions parameter. Be nice and add this
347 * fist before addiding the parameters for the extensions themselves
350 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
351 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
352 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
353 sctp_addto_param(retval, num_ext, extensions);
356 if (asoc->prsctp_enable)
357 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
359 if (sp->adaptation_ind) {
360 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
361 aiparam.param_hdr.length = htons(sizeof(aiparam));
362 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
363 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
366 /* Add SCTP-AUTH chunks to the parameter list */
367 if (ep->auth_enable) {
368 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
369 asoc->c.auth_random);
371 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
374 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
382 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
383 const struct sctp_chunk *chunk,
384 gfp_t gfp, int unkparam_len)
386 struct sctp_inithdr initack;
387 struct sctp_chunk *retval;
388 union sctp_params addrs;
389 struct sctp_sock *sp;
391 struct sctp_cookie_param *cookie;
394 struct sctp_adaptation_ind_param aiparam;
395 struct sctp_supported_ext_param ext_param;
398 struct sctp_paramhdr *auth_chunks = NULL,
404 /* Note: there may be no addresses to embed. */
405 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
407 initack.init_tag = htonl(asoc->c.my_vtag);
408 initack.a_rwnd = htonl(asoc->rwnd);
409 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
410 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
411 initack.initial_tsn = htonl(asoc->c.initial_tsn);
413 /* FIXME: We really ought to build the cookie right
414 * into the packet instead of allocating more fresh memory.
416 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
421 /* Calculate the total size of allocation, include the reserved
422 * space for reporting unknown parameters if it is specified.
424 sp = sctp_sk(asoc->base.sk);
425 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
427 /* Tell peer that we'll do ECN only if peer advertised such cap. */
428 if (asoc->peer.ecn_capable)
429 chunksize += sizeof(ecap_param);
431 if (asoc->peer.prsctp_capable)
432 chunksize += sizeof(prsctp_param);
434 if (asoc->peer.asconf_capable) {
435 extensions[num_ext] = SCTP_CID_ASCONF;
436 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
440 if (asoc->peer.reconf_capable) {
441 extensions[num_ext] = SCTP_CID_RECONF;
445 if (sp->adaptation_ind)
446 chunksize += sizeof(aiparam);
448 if (asoc->peer.auth_capable) {
449 auth_random = (struct sctp_paramhdr *)asoc->c.auth_random;
450 chunksize += ntohs(auth_random->length);
452 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
453 if (auth_hmacs->length)
454 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
458 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
459 if (auth_chunks->length)
460 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
464 extensions[num_ext] = SCTP_CID_AUTH;
469 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
471 /* Now allocate and fill out the chunk. */
472 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
476 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
478 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
479 * HEARTBEAT ACK, * etc.) to the same destination transport
480 * address from which it received the DATA or control chunk
481 * to which it is replying.
483 * [INIT ACK back to where the INIT came from.]
485 retval->transport = chunk->transport;
487 retval->subh.init_hdr =
488 sctp_addto_chunk(retval, sizeof(initack), &initack);
489 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
490 sctp_addto_chunk(retval, cookie_len, cookie);
491 if (asoc->peer.ecn_capable)
492 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
494 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
495 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
496 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
497 sctp_addto_param(retval, num_ext, extensions);
499 if (asoc->peer.prsctp_capable)
500 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
502 if (sp->adaptation_ind) {
503 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
504 aiparam.param_hdr.length = htons(sizeof(aiparam));
505 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
506 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
509 if (asoc->peer.auth_capable) {
510 sctp_addto_chunk(retval, ntohs(auth_random->length),
513 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
516 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
520 /* We need to remove the const qualifier at this point. */
521 retval->asoc = (struct sctp_association *) asoc;
530 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
532 * This chunk is used only during the initialization of an association.
533 * It is sent by the initiator of an association to its peer to complete
534 * the initialization process. This chunk MUST precede any DATA chunk
535 * sent within the association, but MAY be bundled with one or more DATA
536 * chunks in the same packet.
539 * 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
540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
541 * | Type = 10 |Chunk Flags | Length |
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549 * Set to zero on transmit and ignored on receipt.
551 * Length: 16 bits (unsigned integer)
553 * Set to the size of the chunk in bytes, including the 4 bytes of
554 * the chunk header and the size of the Cookie.
556 * Cookie: variable size
558 * This field must contain the exact cookie received in the
559 * State Cookie parameter from the previous INIT ACK.
561 * An implementation SHOULD make the cookie as small as possible
562 * to insure interoperability.
564 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
565 const struct sctp_chunk *chunk)
567 struct sctp_chunk *retval;
571 cookie = asoc->peer.cookie;
572 cookie_len = asoc->peer.cookie_len;
574 /* Build a cookie echo chunk. */
575 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
576 cookie_len, GFP_ATOMIC);
579 retval->subh.cookie_hdr =
580 sctp_addto_chunk(retval, cookie_len, cookie);
582 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
584 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
585 * HEARTBEAT ACK, * etc.) to the same destination transport
586 * address from which it * received the DATA or control chunk
587 * to which it is replying.
589 * [COOKIE ECHO back to where the INIT ACK came from.]
592 retval->transport = chunk->transport;
598 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
600 * This chunk is used only during the initialization of an
601 * association. It is used to acknowledge the receipt of a COOKIE
602 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
603 * within the association, but MAY be bundled with one or more DATA
604 * chunks or SACK chunk in the same SCTP packet.
607 * 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
608 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
609 * | Type = 11 |Chunk Flags | Length = 4 |
610 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
612 * Chunk Flags: 8 bits
614 * Set to zero on transmit and ignored on receipt.
616 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
617 const struct sctp_chunk *chunk)
619 struct sctp_chunk *retval;
621 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
623 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
625 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
626 * HEARTBEAT ACK, * etc.) to the same destination transport
627 * address from which it * received the DATA or control chunk
628 * to which it is replying.
630 * [COOKIE ACK back to where the COOKIE ECHO came from.]
633 retval->transport = chunk->transport;
639 * Appendix A: Explicit Congestion Notification:
642 * RFC 2481 details a specific bit for a sender to send in the header of
643 * its next outbound TCP segment to indicate to its peer that it has
644 * reduced its congestion window. This is termed the CWR bit. For
645 * SCTP the same indication is made by including the CWR chunk.
646 * This chunk contains one data element, i.e. the TSN number that
647 * was sent in the ECNE chunk. This element represents the lowest
648 * TSN number in the datagram that was originally marked with the
652 * 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
653 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
654 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
655 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
656 * | Lowest TSN Number |
657 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659 * Note: The CWR is considered a Control chunk.
661 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
662 const __u32 lowest_tsn,
663 const struct sctp_chunk *chunk)
665 struct sctp_chunk *retval;
666 struct sctp_cwrhdr cwr;
668 cwr.lowest_tsn = htonl(lowest_tsn);
669 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
670 sizeof(cwr), GFP_ATOMIC);
675 retval->subh.ecn_cwr_hdr =
676 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
678 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
680 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
681 * HEARTBEAT ACK, * etc.) to the same destination transport
682 * address from which it * received the DATA or control chunk
683 * to which it is replying.
685 * [Report a reduced congestion window back to where the ECNE
689 retval->transport = chunk->transport;
695 /* Make an ECNE chunk. This is a congestion experienced report. */
696 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
697 const __u32 lowest_tsn)
699 struct sctp_chunk *retval;
700 struct sctp_ecnehdr ecne;
702 ecne.lowest_tsn = htonl(lowest_tsn);
703 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
704 sizeof(ecne), GFP_ATOMIC);
707 retval->subh.ecne_hdr =
708 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
714 /* Make a DATA chunk for the given association from the provided
715 * parameters. However, do not populate the data payload.
717 struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
718 const struct sctp_sndrcvinfo *sinfo,
719 int data_len, __u8 flags, __u16 ssn,
722 struct sctp_chunk *retval;
723 struct sctp_datahdr dp;
726 /* We assign the TSN as LATE as possible, not here when
727 * creating the chunk.
730 dp.stream = htons(sinfo->sinfo_stream);
731 dp.ppid = sinfo->sinfo_ppid;
733 /* Set the flags for an unordered send. */
734 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
735 flags |= SCTP_DATA_UNORDERED;
740 chunk_len = sizeof(dp) + data_len;
741 retval = sctp_make_data(asoc, flags, chunk_len, gfp);
745 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
746 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
752 /* Create a selective ackowledgement (SACK) for the given
753 * association. This reports on which TSN's we've seen to date,
754 * including duplicates and gaps.
756 struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
758 struct sctp_chunk *retval;
759 struct sctp_sackhdr sack;
762 __u16 num_gabs, num_dup_tsns;
763 struct sctp_association *aptr = (struct sctp_association *)asoc;
764 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
765 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
766 struct sctp_transport *trans;
768 memset(gabs, 0, sizeof(gabs));
769 ctsn = sctp_tsnmap_get_ctsn(map);
771 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
773 /* How much room is needed in the chunk? */
774 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
775 num_dup_tsns = sctp_tsnmap_num_dups(map);
777 /* Initialize the SACK header. */
778 sack.cum_tsn_ack = htonl(ctsn);
779 sack.a_rwnd = htonl(asoc->a_rwnd);
780 sack.num_gap_ack_blocks = htons(num_gabs);
781 sack.num_dup_tsns = htons(num_dup_tsns);
784 + sizeof(struct sctp_gap_ack_block) * num_gabs
785 + sizeof(__u32) * num_dup_tsns;
787 /* Create the chunk. */
788 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
792 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
794 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
795 * HEARTBEAT ACK, etc.) to the same destination transport
796 * address from which it received the DATA or control chunk to
797 * which it is replying. This rule should also be followed if
798 * the endpoint is bundling DATA chunks together with the
801 * However, when acknowledging multiple DATA chunks received
802 * in packets from different source addresses in a single
803 * SACK, the SACK chunk may be transmitted to one of the
804 * destination transport addresses from which the DATA or
805 * control chunks being acknowledged were received.
807 * [BUG: We do not implement the following paragraph.
808 * Perhaps we should remember the last transport we used for a
809 * SACK and avoid that (if possible) if we have seen any
810 * duplicates. --piggy]
812 * When a receiver of a duplicate DATA chunk sends a SACK to a
813 * multi- homed endpoint it MAY be beneficial to vary the
814 * destination address and not use the source address of the
815 * DATA chunk. The reason being that receiving a duplicate
816 * from a multi-homed endpoint might indicate that the return
817 * path (as specified in the source address of the DATA chunk)
818 * for the SACK is broken.
820 * [Send to the address from which we last received a DATA chunk.]
822 retval->transport = asoc->peer.last_data_from;
824 retval->subh.sack_hdr =
825 sctp_addto_chunk(retval, sizeof(sack), &sack);
827 /* Add the gap ack block information. */
829 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
832 /* Add the duplicate TSN information. */
834 aptr->stats.idupchunks += num_dup_tsns;
835 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
836 sctp_tsnmap_get_dups(map));
838 /* Once we have a sack generated, check to see what our sack
839 * generation is, if its 0, reset the transports to 0, and reset
840 * the association generation to 1
842 * The idea is that zero is never used as a valid generation for the
843 * association so no transport will match after a wrap event like this,
844 * Until the next sack
846 if (++aptr->peer.sack_generation == 0) {
847 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
849 trans->sack_generation = 0;
850 aptr->peer.sack_generation = 1;
856 /* Make a SHUTDOWN chunk. */
857 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
858 const struct sctp_chunk *chunk)
860 struct sctp_shutdownhdr shut;
861 struct sctp_chunk *retval;
864 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
865 shut.cum_tsn_ack = htonl(ctsn);
867 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
868 sizeof(shut), GFP_ATOMIC);
872 retval->subh.shutdown_hdr =
873 sctp_addto_chunk(retval, sizeof(shut), &shut);
876 retval->transport = chunk->transport;
881 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
882 const struct sctp_chunk *chunk)
884 struct sctp_chunk *retval;
886 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
889 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
891 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
892 * HEARTBEAT ACK, * etc.) to the same destination transport
893 * address from which it * received the DATA or control chunk
894 * to which it is replying.
896 * [ACK back to where the SHUTDOWN came from.]
899 retval->transport = chunk->transport;
904 struct sctp_chunk *sctp_make_shutdown_complete(
905 const struct sctp_association *asoc,
906 const struct sctp_chunk *chunk)
908 struct sctp_chunk *retval;
911 /* Set the T-bit if we have no association (vtag will be
914 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
916 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
919 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
921 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
922 * HEARTBEAT ACK, * etc.) to the same destination transport
923 * address from which it * received the DATA or control chunk
924 * to which it is replying.
926 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
930 retval->transport = chunk->transport;
935 /* Create an ABORT. Note that we set the T bit if we have no
936 * association, except when responding to an INIT (sctpimpguide 2.41).
938 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
939 const struct sctp_chunk *chunk,
942 struct sctp_chunk *retval;
945 /* Set the T-bit if we have no association and 'chunk' is not
946 * an INIT (vtag will be reflected).
949 if (chunk && chunk->chunk_hdr &&
950 chunk->chunk_hdr->type == SCTP_CID_INIT)
953 flags = SCTP_CHUNK_FLAG_T;
956 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
959 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
961 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
962 * HEARTBEAT ACK, * etc.) to the same destination transport
963 * address from which it * received the DATA or control chunk
964 * to which it is replying.
966 * [ABORT back to where the offender came from.]
969 retval->transport = chunk->transport;
974 /* Helper to create ABORT with a NO_USER_DATA error. */
975 struct sctp_chunk *sctp_make_abort_no_data(
976 const struct sctp_association *asoc,
977 const struct sctp_chunk *chunk, __u32 tsn)
979 struct sctp_chunk *retval;
982 retval = sctp_make_abort(asoc, chunk,
983 sizeof(struct sctp_errhdr) + sizeof(tsn));
988 /* Put the tsn back into network byte order. */
989 payload = htonl(tsn);
990 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
991 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
993 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
995 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
996 * HEARTBEAT ACK, * etc.) to the same destination transport
997 * address from which it * received the DATA or control chunk
998 * to which it is replying.
1000 * [ABORT back to where the offender came from.]
1003 retval->transport = chunk->transport;
1009 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1010 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1014 struct sctp_chunk *retval;
1015 void *payload = NULL;
1018 retval = sctp_make_abort(asoc, NULL,
1019 sizeof(struct sctp_errhdr) + paylen);
1024 /* Put the msg_iov together into payload. */
1025 payload = kmalloc(paylen, GFP_KERNEL);
1029 err = memcpy_from_msg(payload, msg, paylen);
1034 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1035 sctp_addto_chunk(retval, paylen, payload);
1045 sctp_chunk_free(retval);
1051 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1054 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1058 int chunklen = ntohs(chunk->chunk_hdr->length);
1060 target = skb_put(chunk->skb, len);
1063 memcpy(target, data, len);
1065 memset(target, 0, len);
1067 /* Adjust the chunk length field. */
1068 chunk->chunk_hdr->length = htons(chunklen + len);
1069 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1074 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1075 struct sctp_chunk *sctp_make_abort_violation(
1076 const struct sctp_association *asoc,
1077 const struct sctp_chunk *chunk,
1078 const __u8 *payload,
1079 const size_t paylen)
1081 struct sctp_chunk *retval;
1082 struct sctp_paramhdr phdr;
1084 retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) +
1085 paylen + sizeof(phdr));
1089 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen +
1092 phdr.type = htons(chunk->chunk_hdr->type);
1093 phdr.length = chunk->chunk_hdr->length;
1094 sctp_addto_chunk(retval, paylen, payload);
1095 sctp_addto_param(retval, sizeof(phdr), &phdr);
1101 struct sctp_chunk *sctp_make_violation_paramlen(
1102 const struct sctp_association *asoc,
1103 const struct sctp_chunk *chunk,
1104 struct sctp_paramhdr *param)
1106 struct sctp_chunk *retval;
1107 static const char error[] = "The following parameter had invalid length:";
1108 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) +
1111 retval = sctp_make_abort(asoc, chunk, payload_len);
1115 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1116 sizeof(error) + sizeof(*param));
1117 sctp_addto_chunk(retval, sizeof(error), error);
1118 sctp_addto_param(retval, sizeof(*param), param);
1124 struct sctp_chunk *sctp_make_violation_max_retrans(
1125 const struct sctp_association *asoc,
1126 const struct sctp_chunk *chunk)
1128 struct sctp_chunk *retval;
1129 static const char error[] = "Association exceeded its max_retans count";
1130 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr);
1132 retval = sctp_make_abort(asoc, chunk, payload_len);
1136 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1137 sctp_addto_chunk(retval, sizeof(error), error);
1143 /* Make a HEARTBEAT chunk. */
1144 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1145 const struct sctp_transport *transport)
1147 struct sctp_chunk *retval;
1148 sctp_sender_hb_info_t hbinfo;
1150 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1151 sizeof(hbinfo), GFP_ATOMIC);
1156 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1157 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1158 hbinfo.daddr = transport->ipaddr;
1159 hbinfo.sent_at = jiffies;
1160 hbinfo.hb_nonce = transport->hb_nonce;
1162 /* Cast away the 'const', as this is just telling the chunk
1163 * what transport it belongs to.
1165 retval->transport = (struct sctp_transport *) transport;
1166 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1173 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1174 const struct sctp_chunk *chunk,
1175 const void *payload, const size_t paylen)
1177 struct sctp_chunk *retval;
1179 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1184 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1186 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1188 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1189 * HEARTBEAT ACK, * etc.) to the same destination transport
1190 * address from which it * received the DATA or control chunk
1191 * to which it is replying.
1193 * [HBACK back to where the HEARTBEAT came from.]
1196 retval->transport = chunk->transport;
1202 /* Create an Operation Error chunk with the specified space reserved.
1203 * This routine can be used for containing multiple causes in the chunk.
1205 static struct sctp_chunk *sctp_make_op_error_space(
1206 const struct sctp_association *asoc,
1207 const struct sctp_chunk *chunk,
1210 struct sctp_chunk *retval;
1212 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1213 sizeof(struct sctp_errhdr) + size,
1218 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1220 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1221 * HEARTBEAT ACK, etc.) to the same destination transport
1222 * address from which it received the DATA or control chunk
1223 * to which it is replying.
1227 retval->transport = chunk->transport;
1233 /* Create an Operation Error chunk of a fixed size,
1234 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1235 * This is a helper function to allocate an error chunk for
1236 * for those invalid parameter codes in which we may not want
1237 * to report all the errors, if the incoming chunk is large
1239 static inline struct sctp_chunk *sctp_make_op_error_fixed(
1240 const struct sctp_association *asoc,
1241 const struct sctp_chunk *chunk)
1243 size_t size = asoc ? asoc->pathmtu : 0;
1246 size = SCTP_DEFAULT_MAXSEGMENT;
1248 return sctp_make_op_error_space(asoc, chunk, size);
1251 /* Create an Operation Error chunk. */
1252 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1253 const struct sctp_chunk *chunk,
1254 __be16 cause_code, const void *payload,
1255 size_t paylen, size_t reserve_tail)
1257 struct sctp_chunk *retval;
1259 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1263 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1264 sctp_addto_chunk(retval, paylen, payload);
1266 sctp_addto_param(retval, reserve_tail, NULL);
1272 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1274 struct sctp_chunk *retval;
1275 struct sctp_hmac *hmac_desc;
1276 struct sctp_authhdr auth_hdr;
1279 /* Get the first hmac that the peer told us to use */
1280 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1281 if (unlikely(!hmac_desc))
1284 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1285 hmac_desc->hmac_len + sizeof(sctp_authhdr_t),
1290 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1291 auth_hdr.shkey_id = htons(asoc->active_key_id);
1293 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1296 hmac = skb_put_zero(retval->skb, hmac_desc->hmac_len);
1298 /* Adjust the chunk header to include the empty MAC */
1299 retval->chunk_hdr->length =
1300 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1301 retval->chunk_end = skb_tail_pointer(retval->skb);
1307 /********************************************************************
1308 * 2nd Level Abstractions
1309 ********************************************************************/
1311 /* Turn an skb into a chunk.
1312 * FIXME: Eventually move the structure directly inside the skb->cb[].
1314 * sctpimpguide-05.txt Section 2.8.2
1315 * M1) Each time a new DATA chunk is transmitted
1316 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1317 * 'TSN.Missing.Report' count will be used to determine missing chunks
1318 * and when to fast retransmit.
1321 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1322 const struct sctp_association *asoc,
1323 struct sock *sk, gfp_t gfp)
1325 struct sctp_chunk *retval;
1327 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1332 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1334 INIT_LIST_HEAD(&retval->list);
1336 retval->asoc = (struct sctp_association *)asoc;
1337 retval->singleton = 1;
1339 retval->fast_retransmit = SCTP_CAN_FRTX;
1341 /* Polish the bead hole. */
1342 INIT_LIST_HEAD(&retval->transmitted_list);
1343 INIT_LIST_HEAD(&retval->frag_list);
1344 SCTP_DBG_OBJCNT_INC(chunk);
1345 refcount_set(&retval->refcnt, 1);
1351 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1352 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1353 union sctp_addr *dest)
1355 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1356 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1359 /* Extract the source address from a chunk. */
1360 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1362 /* If we have a known transport, use that. */
1363 if (chunk->transport) {
1364 return &chunk->transport->ipaddr;
1366 /* Otherwise, extract it from the IP header. */
1367 return &chunk->source;
1371 /* Create a new chunk, setting the type and flags headers from the
1372 * arguments, reserving enough space for a 'paylen' byte payload.
1374 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1375 __u8 type, __u8 flags, int paylen,
1378 struct sctp_chunk *retval;
1379 struct sctp_chunkhdr *chunk_hdr;
1380 struct sk_buff *skb;
1383 /* No need to allocate LL here, as this is only a chunk. */
1384 skb = alloc_skb(SCTP_PAD4(sizeof(*chunk_hdr) + paylen), gfp);
1388 /* Make room for the chunk header. */
1389 chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr));
1390 chunk_hdr->type = type;
1391 chunk_hdr->flags = flags;
1392 chunk_hdr->length = htons(sizeof(*chunk_hdr));
1394 sk = asoc ? asoc->base.sk : NULL;
1395 retval = sctp_chunkify(skb, asoc, sk, gfp);
1401 retval->chunk_hdr = chunk_hdr;
1402 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr);
1404 /* Determine if the chunk needs to be authenticated */
1405 if (sctp_auth_send_cid(type, asoc))
1413 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1414 __u8 flags, int paylen, gfp_t gfp)
1416 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1419 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1420 __u8 type, __u8 flags, int paylen,
1423 struct sctp_chunk *chunk;
1425 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1427 sctp_control_set_owner_w(chunk);
1432 /* Release the memory occupied by a chunk. */
1433 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1435 BUG_ON(!list_empty(&chunk->list));
1436 list_del_init(&chunk->transmitted_list);
1438 consume_skb(chunk->skb);
1439 consume_skb(chunk->auth_chunk);
1441 SCTP_DBG_OBJCNT_DEC(chunk);
1442 kmem_cache_free(sctp_chunk_cachep, chunk);
1445 /* Possibly, free the chunk. */
1446 void sctp_chunk_free(struct sctp_chunk *chunk)
1448 /* Release our reference on the message tracker. */
1450 sctp_datamsg_put(chunk->msg);
1452 sctp_chunk_put(chunk);
1455 /* Grab a reference to the chunk. */
1456 void sctp_chunk_hold(struct sctp_chunk *ch)
1458 refcount_inc(&ch->refcnt);
1461 /* Release a reference to the chunk. */
1462 void sctp_chunk_put(struct sctp_chunk *ch)
1464 if (refcount_dec_and_test(&ch->refcnt))
1465 sctp_chunk_destroy(ch);
1468 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1471 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1474 int chunklen = ntohs(chunk->chunk_hdr->length);
1475 int padlen = SCTP_PAD4(chunklen) - chunklen;
1477 skb_put_zero(chunk->skb, padlen);
1478 target = skb_put_data(chunk->skb, data, len);
1480 /* Adjust the chunk length field. */
1481 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1482 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1487 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1488 * space in the chunk
1490 static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1491 int len, const void *data)
1493 if (skb_tailroom(chunk->skb) >= len)
1494 return sctp_addto_chunk(chunk, len, data);
1499 /* Append bytes from user space to the end of a chunk. Will panic if
1500 * chunk is not big enough.
1501 * Returns a kernel err value.
1503 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1504 struct iov_iter *from)
1508 /* Make room in chunk for data. */
1509 target = skb_put(chunk->skb, len);
1511 /* Copy data (whole iovec) into chunk */
1512 if (!copy_from_iter_full(target, len, from))
1515 /* Adjust the chunk length field. */
1516 chunk->chunk_hdr->length =
1517 htons(ntohs(chunk->chunk_hdr->length) + len);
1518 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1523 /* Helper function to assign a TSN if needed. This assumes that both
1524 * the data_hdr and association have already been assigned.
1526 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1528 struct sctp_datamsg *msg;
1529 struct sctp_chunk *lchunk;
1530 struct sctp_stream *stream;
1537 /* All fragments will be on the same stream */
1538 sid = ntohs(chunk->subh.data_hdr->stream);
1539 stream = &chunk->asoc->stream;
1541 /* Now assign the sequence number to the entire message.
1542 * All fragments must have the same stream sequence number.
1545 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1546 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1549 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1550 ssn = sctp_ssn_next(stream, out, sid);
1552 ssn = sctp_ssn_peek(stream, out, sid);
1555 lchunk->subh.data_hdr->ssn = htons(ssn);
1556 lchunk->has_ssn = 1;
1560 /* Helper function to assign a TSN if needed. This assumes that both
1561 * the data_hdr and association have already been assigned.
1563 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1565 if (!chunk->has_tsn) {
1566 /* This is the last possible instant to
1569 chunk->subh.data_hdr->tsn =
1570 htonl(sctp_association_get_next_tsn(chunk->asoc));
1575 /* Create a CLOSED association to use with an incoming packet. */
1576 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1577 struct sctp_chunk *chunk,
1580 struct sctp_association *asoc;
1581 struct sk_buff *skb;
1584 /* Create the bare association. */
1585 scope = sctp_scope(sctp_source(chunk));
1586 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1591 /* Create an entry for the source address of the packet. */
1592 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1598 /* Build a cookie representing asoc.
1599 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1601 static struct sctp_cookie_param *sctp_pack_cookie(
1602 const struct sctp_endpoint *ep,
1603 const struct sctp_association *asoc,
1604 const struct sctp_chunk *init_chunk,
1606 const __u8 *raw_addrs, int addrs_len)
1608 struct sctp_signed_cookie *cookie;
1609 struct sctp_cookie_param *retval;
1610 int headersize, bodysize;
1612 /* Header size is static data prior to the actual cookie, including
1615 headersize = sizeof(struct sctp_paramhdr) +
1616 (sizeof(struct sctp_signed_cookie) -
1617 sizeof(struct sctp_cookie));
1618 bodysize = sizeof(struct sctp_cookie)
1619 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1621 /* Pad out the cookie to a multiple to make the signature
1622 * functions simpler to write.
1624 if (bodysize % SCTP_COOKIE_MULTIPLE)
1625 bodysize += SCTP_COOKIE_MULTIPLE
1626 - (bodysize % SCTP_COOKIE_MULTIPLE);
1627 *cookie_len = headersize + bodysize;
1629 /* Clear this memory since we are sending this data structure
1630 * out on the network.
1632 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1636 cookie = (struct sctp_signed_cookie *) retval->body;
1638 /* Set up the parameter header. */
1639 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1640 retval->p.length = htons(*cookie_len);
1642 /* Copy the cookie part of the association itself. */
1643 cookie->c = asoc->c;
1644 /* Save the raw address list length in the cookie. */
1645 cookie->c.raw_addr_list_len = addrs_len;
1647 /* Remember PR-SCTP capability. */
1648 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1650 /* Save adaptation indication in the cookie. */
1651 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1653 /* Set an expiration time for the cookie. */
1654 cookie->c.expiration = ktime_add(asoc->cookie_life,
1657 /* Copy the peer's init packet. */
1658 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1659 ntohs(init_chunk->chunk_hdr->length));
1661 /* Copy the raw local address list of the association. */
1662 memcpy((__u8 *)&cookie->c.peer_init[0] +
1663 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1665 if (sctp_sk(ep->base.sk)->hmac) {
1666 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1669 /* Sign the message. */
1670 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1673 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1674 sizeof(ep->secret_key)) ?:
1675 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1677 shash_desc_zero(desc);
1691 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1692 struct sctp_association *sctp_unpack_cookie(
1693 const struct sctp_endpoint *ep,
1694 const struct sctp_association *asoc,
1695 struct sctp_chunk *chunk, gfp_t gfp,
1696 int *error, struct sctp_chunk **errp)
1698 struct sctp_association *retval = NULL;
1699 struct sctp_signed_cookie *cookie;
1700 struct sctp_cookie *bear_cookie;
1701 int headersize, bodysize, fixed_size;
1702 __u8 *digest = ep->digest;
1705 struct sk_buff *skb = chunk->skb;
1708 /* Header size is static data prior to the actual cookie, including
1711 headersize = sizeof(struct sctp_chunkhdr) +
1712 (sizeof(struct sctp_signed_cookie) -
1713 sizeof(struct sctp_cookie));
1714 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1715 fixed_size = headersize + sizeof(struct sctp_cookie);
1717 /* Verify that the chunk looks like it even has a cookie.
1718 * There must be enough room for our cookie and our peer's
1721 len = ntohs(chunk->chunk_hdr->length);
1722 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1725 /* Verify that the cookie has been padded out. */
1726 if (bodysize % SCTP_COOKIE_MULTIPLE)
1729 /* Process the cookie. */
1730 cookie = chunk->subh.cookie_hdr;
1731 bear_cookie = &cookie->c;
1733 if (!sctp_sk(ep->base.sk)->hmac)
1736 /* Check the signature. */
1738 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1741 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1744 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1745 sizeof(ep->secret_key)) ?:
1746 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1748 shash_desc_zero(desc);
1751 *error = -SCTP_IERROR_NOMEM;
1756 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1757 *error = -SCTP_IERROR_BAD_SIG;
1762 /* IG Section 2.35.2:
1763 * 3) Compare the port numbers and the verification tag contained
1764 * within the COOKIE ECHO chunk to the actual port numbers and the
1765 * verification tag within the SCTP common header of the received
1766 * packet. If these values do not match the packet MUST be silently
1769 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1770 *error = -SCTP_IERROR_BAD_TAG;
1774 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1775 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1776 *error = -SCTP_IERROR_BAD_PORTS;
1780 /* Check to see if the cookie is stale. If there is already
1781 * an association, there is no need to check cookie's expiration
1782 * for init collision case of lost COOKIE ACK.
1783 * If skb has been timestamped, then use the stamp, otherwise
1784 * use current time. This introduces a small possibility that
1785 * that a cookie may be considered expired, but his would only slow
1786 * down the new association establishment instead of every packet.
1788 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1789 kt = skb_get_ktime(skb);
1791 kt = ktime_get_real();
1793 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
1795 * Section 3.3.10.3 Stale Cookie Error (3)
1799 * Stale Cookie Error: Indicates the receipt of a valid State
1800 * Cookie that has expired.
1802 len = ntohs(chunk->chunk_hdr->length);
1803 *errp = sctp_make_op_error_space(asoc, chunk, len);
1805 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1806 __be32 n = htonl(usecs);
1808 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
1810 sctp_addto_chunk(*errp, sizeof(n), &n);
1811 *error = -SCTP_IERROR_STALE_COOKIE;
1813 *error = -SCTP_IERROR_NOMEM;
1818 /* Make a new base association. */
1819 scope = sctp_scope(sctp_source(chunk));
1820 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1822 *error = -SCTP_IERROR_NOMEM;
1826 /* Set up our peer's port number. */
1827 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1829 /* Populate the association from the cookie. */
1830 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1832 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1834 *error = -SCTP_IERROR_NOMEM;
1838 /* Also, add the destination address. */
1839 if (list_empty(&retval->base.bind_addr.address_list)) {
1840 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1841 sizeof(chunk->dest), SCTP_ADDR_SRC,
1845 retval->next_tsn = retval->c.initial_tsn;
1846 retval->ctsn_ack_point = retval->next_tsn - 1;
1847 retval->addip_serial = retval->c.initial_tsn;
1848 retval->strreset_outseq = retval->c.initial_tsn;
1849 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1850 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1851 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1853 /* The INIT stuff will be done by the side effects. */
1858 sctp_association_free(retval);
1863 /* Yikes! The packet is either corrupt or deliberately
1866 *error = -SCTP_IERROR_MALFORMED;
1870 /********************************************************************
1871 * 3rd Level Abstractions
1872 ********************************************************************/
1874 struct __sctp_missing {
1880 * Report a missing mandatory parameter.
1882 static int sctp_process_missing_param(const struct sctp_association *asoc,
1883 enum sctp_param paramtype,
1884 struct sctp_chunk *chunk,
1885 struct sctp_chunk **errp)
1887 struct __sctp_missing report;
1890 len = SCTP_PAD4(sizeof(report));
1892 /* Make an ERROR chunk, preparing enough room for
1893 * returning multiple unknown parameters.
1896 *errp = sctp_make_op_error_space(asoc, chunk, len);
1899 report.num_missing = htonl(1);
1900 report.type = paramtype;
1901 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1903 sctp_addto_chunk(*errp, sizeof(report), &report);
1906 /* Stop processing this chunk. */
1910 /* Report an Invalid Mandatory Parameter. */
1911 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1912 struct sctp_chunk *chunk,
1913 struct sctp_chunk **errp)
1915 /* Invalid Mandatory Parameter Error has no payload. */
1918 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1921 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1923 /* Stop processing this chunk. */
1927 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1928 struct sctp_paramhdr *param,
1929 const struct sctp_chunk *chunk,
1930 struct sctp_chunk **errp)
1932 /* This is a fatal error. Any accumulated non-fatal errors are
1936 sctp_chunk_free(*errp);
1938 /* Create an error chunk and fill it in with our payload. */
1939 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1945 /* Do not attempt to handle the HOST_NAME parm. However, do
1946 * send back an indicator to the peer.
1948 static int sctp_process_hn_param(const struct sctp_association *asoc,
1949 union sctp_params param,
1950 struct sctp_chunk *chunk,
1951 struct sctp_chunk **errp)
1953 __u16 len = ntohs(param.p->length);
1955 /* Processing of the HOST_NAME parameter will generate an
1956 * ABORT. If we've accumulated any non-fatal errors, they
1957 * would be unrecognized parameters and we should not include
1958 * them in the ABORT.
1961 sctp_chunk_free(*errp);
1963 *errp = sctp_make_op_error_space(asoc, chunk, len);
1966 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1967 sctp_addto_chunk(*errp, len, param.v);
1970 /* Stop processing this chunk. */
1974 static int sctp_verify_ext_param(struct net *net, union sctp_params param)
1976 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
1978 int have_asconf = 0;
1981 for (i = 0; i < num_ext; i++) {
1982 switch (param.ext->chunks[i]) {
1986 case SCTP_CID_ASCONF:
1987 case SCTP_CID_ASCONF_ACK:
1993 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1994 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1995 * only if ADD-IP is turned on and we are not backward-compatible
1998 if (net->sctp.addip_noauth)
2001 if (net->sctp.addip_enable && !have_auth && have_asconf)
2007 static void sctp_process_ext_param(struct sctp_association *asoc,
2008 union sctp_params param)
2010 struct net *net = sock_net(asoc->base.sk);
2011 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2014 for (i = 0; i < num_ext; i++) {
2015 switch (param.ext->chunks[i]) {
2016 case SCTP_CID_RECONF:
2017 if (asoc->reconf_enable &&
2018 !asoc->peer.reconf_capable)
2019 asoc->peer.reconf_capable = 1;
2021 case SCTP_CID_FWD_TSN:
2022 if (asoc->prsctp_enable && !asoc->peer.prsctp_capable)
2023 asoc->peer.prsctp_capable = 1;
2026 /* if the peer reports AUTH, assume that he
2029 if (asoc->ep->auth_enable)
2030 asoc->peer.auth_capable = 1;
2032 case SCTP_CID_ASCONF:
2033 case SCTP_CID_ASCONF_ACK:
2034 if (net->sctp.addip_enable)
2035 asoc->peer.asconf_capable = 1;
2043 /* RFC 3.2.1 & the Implementers Guide 2.2.
2045 * The Parameter Types are encoded such that the
2046 * highest-order two bits specify the action that must be
2047 * taken if the processing endpoint does not recognize the
2050 * 00 - Stop processing this parameter; do not process any further
2051 * parameters within this chunk
2053 * 01 - Stop processing this parameter, do not process any further
2054 * parameters within this chunk, and report the unrecognized
2055 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2057 * 10 - Skip this parameter and continue processing.
2059 * 11 - Skip this parameter and continue processing but
2060 * report the unrecognized parameter in an
2061 * 'Unrecognized Parameter' ERROR chunk.
2064 * SCTP_IERROR_NO_ERROR - continue with the chunk
2065 * SCTP_IERROR_ERROR - stop and report an error.
2066 * SCTP_IERROR_NOMEME - out of memory.
2068 static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2069 union sctp_params param,
2070 struct sctp_chunk *chunk,
2071 struct sctp_chunk **errp)
2073 int retval = SCTP_IERROR_NO_ERROR;
2075 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2076 case SCTP_PARAM_ACTION_DISCARD:
2077 retval = SCTP_IERROR_ERROR;
2079 case SCTP_PARAM_ACTION_SKIP:
2081 case SCTP_PARAM_ACTION_DISCARD_ERR:
2082 retval = SCTP_IERROR_ERROR;
2084 case SCTP_PARAM_ACTION_SKIP_ERR:
2085 /* Make an ERROR chunk, preparing enough room for
2086 * returning multiple unknown parameters.
2089 *errp = sctp_make_op_error_fixed(asoc, chunk);
2092 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2093 SCTP_PAD4(ntohs(param.p->length))))
2094 sctp_addto_chunk_fixed(*errp,
2095 SCTP_PAD4(ntohs(param.p->length)),
2098 /* If there is no memory for generating the ERROR
2099 * report as specified, an ABORT will be triggered
2100 * to the peer and the association won't be
2103 retval = SCTP_IERROR_NOMEM;
2113 /* Verify variable length parameters
2115 * SCTP_IERROR_ABORT - trigger an ABORT
2116 * SCTP_IERROR_NOMEM - out of memory (abort)
2117 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2118 * SCTP_IERROR_NO_ERROR - continue with the chunk
2120 static sctp_ierror_t sctp_verify_param(struct net *net,
2121 const struct sctp_endpoint *ep,
2122 const struct sctp_association *asoc,
2123 union sctp_params param,
2125 struct sctp_chunk *chunk,
2126 struct sctp_chunk **err_chunk)
2128 struct sctp_hmac_algo_param *hmacs;
2129 int retval = SCTP_IERROR_NO_ERROR;
2130 __u16 n_elt, id = 0;
2133 /* FIXME - This routine is not looking at each parameter per the
2134 * chunk type, i.e., unrecognized parameters should be further
2135 * identified based on the chunk id.
2138 switch (param.p->type) {
2139 case SCTP_PARAM_IPV4_ADDRESS:
2140 case SCTP_PARAM_IPV6_ADDRESS:
2141 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2142 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2143 case SCTP_PARAM_STATE_COOKIE:
2144 case SCTP_PARAM_HEARTBEAT_INFO:
2145 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2146 case SCTP_PARAM_ECN_CAPABLE:
2147 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2150 case SCTP_PARAM_SUPPORTED_EXT:
2151 if (!sctp_verify_ext_param(net, param))
2152 return SCTP_IERROR_ABORT;
2155 case SCTP_PARAM_SET_PRIMARY:
2156 if (net->sctp.addip_enable)
2160 case SCTP_PARAM_HOST_NAME_ADDRESS:
2161 /* Tell the peer, we won't support this param. */
2162 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2163 retval = SCTP_IERROR_ABORT;
2166 case SCTP_PARAM_FWD_TSN_SUPPORT:
2167 if (ep->prsctp_enable)
2171 case SCTP_PARAM_RANDOM:
2172 if (!ep->auth_enable)
2175 /* SCTP-AUTH: Secion 6.1
2176 * If the random number is not 32 byte long the association
2177 * MUST be aborted. The ABORT chunk SHOULD contain the error
2178 * cause 'Protocol Violation'.
2180 if (SCTP_AUTH_RANDOM_LENGTH !=
2181 ntohs(param.p->length) - sizeof(struct sctp_paramhdr)) {
2182 sctp_process_inv_paramlength(asoc, param.p,
2184 retval = SCTP_IERROR_ABORT;
2188 case SCTP_PARAM_CHUNKS:
2189 if (!ep->auth_enable)
2192 /* SCTP-AUTH: Section 3.2
2193 * The CHUNKS parameter MUST be included once in the INIT or
2194 * INIT-ACK chunk if the sender wants to receive authenticated
2195 * chunks. Its maximum length is 260 bytes.
2197 if (260 < ntohs(param.p->length)) {
2198 sctp_process_inv_paramlength(asoc, param.p,
2200 retval = SCTP_IERROR_ABORT;
2204 case SCTP_PARAM_HMAC_ALGO:
2205 if (!ep->auth_enable)
2208 hmacs = (struct sctp_hmac_algo_param *)param.p;
2209 n_elt = (ntohs(param.p->length) -
2210 sizeof(struct sctp_paramhdr)) >> 1;
2212 /* SCTP-AUTH: Section 6.1
2213 * The HMAC algorithm based on SHA-1 MUST be supported and
2214 * included in the HMAC-ALGO parameter.
2216 for (i = 0; i < n_elt; i++) {
2217 id = ntohs(hmacs->hmac_ids[i]);
2219 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2223 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2224 sctp_process_inv_paramlength(asoc, param.p, chunk,
2226 retval = SCTP_IERROR_ABORT;
2231 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2232 __func__, ntohs(param.p->type), cid);
2234 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2240 /* Verify the INIT packet before we process it. */
2241 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2242 const struct sctp_association *asoc, enum sctp_cid cid,
2243 struct sctp_init_chunk *peer_init,
2244 struct sctp_chunk *chunk, struct sctp_chunk **errp)
2246 union sctp_params param;
2247 bool has_cookie = false;
2250 /* Check for missing mandatory parameters. Note: Initial TSN is
2251 * also mandatory, but is not checked here since the valid range
2252 * is 0..2**32-1. RFC4960, section 3.3.3.
2254 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2255 peer_init->init_hdr.num_inbound_streams == 0 ||
2256 peer_init->init_hdr.init_tag == 0 ||
2257 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2258 return sctp_process_inv_mandatory(asoc, chunk, errp);
2260 sctp_walk_params(param, peer_init, init_hdr.params) {
2261 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2265 /* There is a possibility that a parameter length was bad and
2266 * in that case we would have stoped walking the parameters.
2267 * The current param.p would point at the bad one.
2268 * Current consensus on the mailing list is to generate a PROTOCOL
2269 * VIOLATION error. We build the ERROR chunk here and let the normal
2270 * error handling code build and send the packet.
2272 if (param.v != (void *)chunk->chunk_end)
2273 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2275 /* The only missing mandatory param possible today is
2276 * the state cookie for an INIT-ACK chunk.
2278 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2279 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2282 /* Verify all the variable length parameters */
2283 sctp_walk_params(param, peer_init, init_hdr.params) {
2284 result = sctp_verify_param(net, ep, asoc, param, cid,
2287 case SCTP_IERROR_ABORT:
2288 case SCTP_IERROR_NOMEM:
2290 case SCTP_IERROR_ERROR:
2292 case SCTP_IERROR_NO_ERROR:
2297 } /* for (loop through all parameters) */
2302 /* Unpack the parameters in an INIT packet into an association.
2303 * Returns 0 on failure, else success.
2304 * FIXME: This is an association method.
2306 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2307 const union sctp_addr *peer_addr,
2308 struct sctp_init_chunk *peer_init, gfp_t gfp)
2310 struct net *net = sock_net(asoc->base.sk);
2311 union sctp_params param;
2312 struct sctp_transport *transport;
2313 struct list_head *pos, *temp;
2315 union sctp_addr addr;
2319 /* We must include the address that the INIT packet came from.
2320 * This is the only address that matters for an INIT packet.
2321 * When processing a COOKIE ECHO, we retrieve the from address
2322 * of the INIT from the cookie.
2325 /* This implementation defaults to making the first transport
2326 * added as the primary transport. The source address seems to
2327 * be a a better choice than any of the embedded addresses.
2329 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2332 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2335 /* Process the initialization parameters. */
2336 sctp_walk_params(param, peer_init, init_hdr.params) {
2337 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2338 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2339 af = sctp_get_af_specific(param_type2af(param.p->type));
2340 af->from_addr_param(&addr, param.addr,
2341 chunk->sctp_hdr->source, 0);
2342 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2346 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2350 /* source address of chunk may not match any valid address */
2354 /* AUTH: After processing the parameters, make sure that we
2355 * have all the required info to potentially do authentications.
2357 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2358 !asoc->peer.peer_hmacs))
2359 asoc->peer.auth_capable = 0;
2361 /* In a non-backward compatible mode, if the peer claims
2362 * support for ADD-IP but not AUTH, the ADD-IP spec states
2363 * that we MUST ABORT the association. Section 6. The section
2364 * also give us an option to silently ignore the packet, which
2365 * is what we'll do here.
2367 if (!net->sctp.addip_noauth &&
2368 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2369 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2371 SCTP_PARAM_SET_PRIMARY);
2372 asoc->peer.asconf_capable = 0;
2376 /* Walk list of transports, removing transports in the UNKNOWN state. */
2377 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2378 transport = list_entry(pos, struct sctp_transport, transports);
2379 if (transport->state == SCTP_UNKNOWN) {
2380 sctp_assoc_rm_peer(asoc, transport);
2384 /* The fixed INIT headers are always in network byte
2387 asoc->peer.i.init_tag =
2388 ntohl(peer_init->init_hdr.init_tag);
2389 asoc->peer.i.a_rwnd =
2390 ntohl(peer_init->init_hdr.a_rwnd);
2391 asoc->peer.i.num_outbound_streams =
2392 ntohs(peer_init->init_hdr.num_outbound_streams);
2393 asoc->peer.i.num_inbound_streams =
2394 ntohs(peer_init->init_hdr.num_inbound_streams);
2395 asoc->peer.i.initial_tsn =
2396 ntohl(peer_init->init_hdr.initial_tsn);
2398 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2400 /* Apply the upper bounds for output streams based on peer's
2401 * number of inbound streams.
2403 if (asoc->c.sinit_num_ostreams >
2404 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2405 asoc->c.sinit_num_ostreams =
2406 ntohs(peer_init->init_hdr.num_inbound_streams);
2409 if (asoc->c.sinit_max_instreams >
2410 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2411 asoc->c.sinit_max_instreams =
2412 ntohs(peer_init->init_hdr.num_outbound_streams);
2415 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2416 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2418 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2419 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2421 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2422 cookie = asoc->peer.cookie;
2424 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
2425 if (!asoc->peer.cookie)
2429 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2430 * high (for example, implementations MAY use the size of the receiver
2431 * advertised window).
2433 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2435 transport->ssthresh = asoc->peer.i.a_rwnd;
2438 /* Set up the TSN tracking pieces. */
2439 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2440 asoc->peer.i.initial_tsn, gfp))
2443 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2445 * The stream sequence number in all the streams shall start
2446 * from 0 when the association is established. Also, when the
2447 * stream sequence number reaches the value 65535 the next
2448 * stream sequence number shall be set to 0.
2451 if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
2452 asoc->c.sinit_max_instreams, gfp))
2455 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2458 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2460 * When an endpoint has an ASCONF signaled change to be sent to the
2461 * remote endpoint it should do the following:
2463 * A2) A serial number should be assigned to the Chunk. The serial
2464 * number should be a monotonically increasing number. All serial
2465 * numbers are defined to be initialized at the start of the
2466 * association to the same value as the Initial TSN.
2468 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2472 /* Release the transport structures. */
2473 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2474 transport = list_entry(pos, struct sctp_transport, transports);
2475 if (transport->state != SCTP_ACTIVE)
2476 sctp_assoc_rm_peer(asoc, transport);
2484 /* Update asoc with the option described in param.
2486 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2488 * asoc is the association to update.
2489 * param is the variable length parameter to use for update.
2490 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2491 * If the current packet is an INIT we want to minimize the amount of
2492 * work we do. In particular, we should not build transport
2493 * structures for the addresses.
2495 static int sctp_process_param(struct sctp_association *asoc,
2496 union sctp_params param,
2497 const union sctp_addr *peer_addr,
2500 struct net *net = sock_net(asoc->base.sk);
2501 union sctp_addr addr;
2508 union sctp_addr_param *addr_param;
2509 struct sctp_transport *t;
2510 struct sctp_endpoint *ep = asoc->ep;
2512 /* We maintain all INIT parameters in network byte order all the
2513 * time. This allows us to not worry about whether the parameters
2514 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2516 switch (param.p->type) {
2517 case SCTP_PARAM_IPV6_ADDRESS:
2518 if (PF_INET6 != asoc->base.sk->sk_family)
2522 case SCTP_PARAM_IPV4_ADDRESS:
2523 /* v4 addresses are not allowed on v6-only socket */
2524 if (ipv6_only_sock(asoc->base.sk))
2527 af = sctp_get_af_specific(param_type2af(param.p->type));
2528 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
2529 scope = sctp_scope(peer_addr);
2530 if (sctp_in_scope(net, &addr, scope))
2531 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2535 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2536 if (!net->sctp.cookie_preserve_enable)
2539 stale = ntohl(param.life->lifespan_increment);
2541 /* Suggested Cookie Life span increment's unit is msec,
2544 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2547 case SCTP_PARAM_HOST_NAME_ADDRESS:
2548 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2551 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2552 /* Turn off the default values first so we'll know which
2553 * ones are really set by the peer.
2555 asoc->peer.ipv4_address = 0;
2556 asoc->peer.ipv6_address = 0;
2558 /* Assume that peer supports the address family
2559 * by which it sends a packet.
2561 if (peer_addr->sa.sa_family == AF_INET6)
2562 asoc->peer.ipv6_address = 1;
2563 else if (peer_addr->sa.sa_family == AF_INET)
2564 asoc->peer.ipv4_address = 1;
2566 /* Cycle through address types; avoid divide by 0. */
2567 sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2569 sat /= sizeof(__u16);
2571 for (i = 0; i < sat; ++i) {
2572 switch (param.sat->types[i]) {
2573 case SCTP_PARAM_IPV4_ADDRESS:
2574 asoc->peer.ipv4_address = 1;
2577 case SCTP_PARAM_IPV6_ADDRESS:
2578 if (PF_INET6 == asoc->base.sk->sk_family)
2579 asoc->peer.ipv6_address = 1;
2582 case SCTP_PARAM_HOST_NAME_ADDRESS:
2583 asoc->peer.hostname_address = 1;
2586 default: /* Just ignore anything else. */
2592 case SCTP_PARAM_STATE_COOKIE:
2593 asoc->peer.cookie_len =
2594 ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2595 asoc->peer.cookie = param.cookie->body;
2598 case SCTP_PARAM_HEARTBEAT_INFO:
2599 /* Would be odd to receive, but it causes no problems. */
2602 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2603 /* Rejected during verify stage. */
2606 case SCTP_PARAM_ECN_CAPABLE:
2607 asoc->peer.ecn_capable = 1;
2610 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2611 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2614 case SCTP_PARAM_SET_PRIMARY:
2615 if (!net->sctp.addip_enable)
2618 addr_param = param.v + sizeof(struct sctp_addip_param);
2620 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2624 af->from_addr_param(&addr, addr_param,
2625 htons(asoc->peer.port), 0);
2627 /* if the address is invalid, we can't process it.
2628 * XXX: see spec for what to do.
2630 if (!af->addr_valid(&addr, NULL, NULL))
2633 t = sctp_assoc_lookup_paddr(asoc, &addr);
2637 sctp_assoc_set_primary(asoc, t);
2640 case SCTP_PARAM_SUPPORTED_EXT:
2641 sctp_process_ext_param(asoc, param);
2644 case SCTP_PARAM_FWD_TSN_SUPPORT:
2645 if (asoc->prsctp_enable) {
2646 asoc->peer.prsctp_capable = 1;
2652 case SCTP_PARAM_RANDOM:
2653 if (!ep->auth_enable)
2656 /* Save peer's random parameter */
2657 asoc->peer.peer_random = kmemdup(param.p,
2658 ntohs(param.p->length), gfp);
2659 if (!asoc->peer.peer_random) {
2665 case SCTP_PARAM_HMAC_ALGO:
2666 if (!ep->auth_enable)
2669 /* Save peer's HMAC list */
2670 asoc->peer.peer_hmacs = kmemdup(param.p,
2671 ntohs(param.p->length), gfp);
2672 if (!asoc->peer.peer_hmacs) {
2677 /* Set the default HMAC the peer requested*/
2678 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2681 case SCTP_PARAM_CHUNKS:
2682 if (!ep->auth_enable)
2685 asoc->peer.peer_chunks = kmemdup(param.p,
2686 ntohs(param.p->length), gfp);
2687 if (!asoc->peer.peer_chunks)
2692 /* Any unrecognized parameters should have been caught
2693 * and handled by sctp_verify_param() which should be
2694 * called prior to this routine. Simply log the error
2697 pr_debug("%s: ignoring param:%d for association:%p.\n",
2698 __func__, ntohs(param.p->type), asoc);
2705 /* Select a new verification tag. */
2706 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2708 /* I believe that this random number generator complies with RFC1750.
2709 * A tag of 0 is reserved for special cases (e.g. INIT).
2714 get_random_bytes(&x, sizeof(__u32));
2720 /* Select an initial TSN to send during startup. */
2721 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2725 get_random_bytes(&retval, sizeof(__u32));
2730 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2732 * 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
2733 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2734 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2735 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2737 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2738 * | Address Parameter |
2739 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2740 * | ASCONF Parameter #1 |
2741 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2745 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2746 * | ASCONF Parameter #N |
2747 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2749 * Address Parameter and other parameter will not be wrapped in this function
2751 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2752 union sctp_addr *addr,
2755 struct sctp_addiphdr asconf;
2756 struct sctp_chunk *retval;
2757 int length = sizeof(asconf) + vparam_len;
2758 union sctp_addr_param addrparam;
2760 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2762 addrlen = af->to_addr_param(addr, &addrparam);
2767 /* Create the chunk. */
2768 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2773 asconf.serial = htonl(asoc->addip_serial++);
2775 retval->subh.addip_hdr =
2776 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2777 retval->param_hdr.v =
2778 sctp_addto_chunk(retval, addrlen, &addrparam);
2784 * 3.2.1 Add IP Address
2786 * 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
2787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2788 * | Type = 0xC001 | Length = Variable |
2789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2790 * | ASCONF-Request Correlation ID |
2791 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2792 * | Address Parameter |
2793 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2795 * 3.2.2 Delete IP Address
2797 * 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
2798 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2799 * | Type = 0xC002 | Length = Variable |
2800 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2801 * | ASCONF-Request Correlation ID |
2802 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2803 * | Address Parameter |
2804 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2807 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2808 union sctp_addr *laddr,
2809 struct sockaddr *addrs,
2813 struct sctp_addip_param param;
2814 struct sctp_chunk *retval;
2815 union sctp_addr_param addr_param;
2816 union sctp_addr *addr;
2819 int paramlen = sizeof(param);
2820 int addr_param_len = 0;
2825 /* Get total length of all the address parameters. */
2827 for (i = 0; i < addrcnt; i++) {
2829 af = sctp_get_af_specific(addr->v4.sin_family);
2830 addr_param_len = af->to_addr_param(addr, &addr_param);
2832 totallen += paramlen;
2833 totallen += addr_param_len;
2835 addr_buf += af->sockaddr_len;
2836 if (asoc->asconf_addr_del_pending && !del_pickup) {
2837 /* reuse the parameter length from the same scope one */
2838 totallen += paramlen;
2839 totallen += addr_param_len;
2842 pr_debug("%s: picked same-scope del_pending addr, "
2843 "totallen for all addresses is %d\n",
2844 __func__, totallen);
2848 /* Create an asconf chunk with the required length. */
2849 retval = sctp_make_asconf(asoc, laddr, totallen);
2853 /* Add the address parameters to the asconf chunk. */
2855 for (i = 0; i < addrcnt; i++) {
2857 af = sctp_get_af_specific(addr->v4.sin_family);
2858 addr_param_len = af->to_addr_param(addr, &addr_param);
2859 param.param_hdr.type = flags;
2860 param.param_hdr.length = htons(paramlen + addr_param_len);
2863 sctp_addto_chunk(retval, paramlen, ¶m);
2864 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2866 addr_buf += af->sockaddr_len;
2868 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2869 addr = asoc->asconf_addr_del_pending;
2870 af = sctp_get_af_specific(addr->v4.sin_family);
2871 addr_param_len = af->to_addr_param(addr, &addr_param);
2872 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2873 param.param_hdr.length = htons(paramlen + addr_param_len);
2876 sctp_addto_chunk(retval, paramlen, ¶m);
2877 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2883 * 3.2.4 Set Primary IP Address
2885 * 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
2886 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2887 * | Type =0xC004 | Length = Variable |
2888 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2889 * | ASCONF-Request Correlation ID |
2890 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2891 * | Address Parameter |
2892 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2894 * Create an ASCONF chunk with Set Primary IP address parameter.
2896 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2897 union sctp_addr *addr)
2899 struct sctp_addip_param param;
2900 struct sctp_chunk *retval;
2901 int len = sizeof(param);
2902 union sctp_addr_param addrparam;
2904 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2906 addrlen = af->to_addr_param(addr, &addrparam);
2911 /* Create the chunk and make asconf header. */
2912 retval = sctp_make_asconf(asoc, addr, len);
2916 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2917 param.param_hdr.length = htons(len);
2920 sctp_addto_chunk(retval, sizeof(param), ¶m);
2921 sctp_addto_chunk(retval, addrlen, &addrparam);
2926 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2928 * 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
2929 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2930 * | Type = 0x80 | Chunk Flags | Chunk Length |
2931 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2933 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2934 * | ASCONF Parameter Response#1 |
2935 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2939 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2940 * | ASCONF Parameter Response#N |
2941 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2943 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2945 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2946 __u32 serial, int vparam_len)
2948 struct sctp_addiphdr asconf;
2949 struct sctp_chunk *retval;
2950 int length = sizeof(asconf) + vparam_len;
2952 /* Create the chunk. */
2953 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2958 asconf.serial = htonl(serial);
2960 retval->subh.addip_hdr =
2961 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2966 /* Add response parameters to an ASCONF_ACK chunk. */
2967 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2969 struct sctp_addip_param *asconf_param)
2971 struct sctp_addip_param ack_param;
2972 struct sctp_errhdr err_param;
2973 int asconf_param_len = 0;
2974 int err_param_len = 0;
2975 __be16 response_type;
2977 if (SCTP_ERROR_NO_ERROR == err_code) {
2978 response_type = SCTP_PARAM_SUCCESS_REPORT;
2980 response_type = SCTP_PARAM_ERR_CAUSE;
2981 err_param_len = sizeof(err_param);
2984 ntohs(asconf_param->param_hdr.length);
2987 /* Add Success Indication or Error Cause Indication parameter. */
2988 ack_param.param_hdr.type = response_type;
2989 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2992 ack_param.crr_id = crr_id;
2993 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2995 if (SCTP_ERROR_NO_ERROR == err_code)
2998 /* Add Error Cause parameter. */
2999 err_param.cause = err_code;
3000 err_param.length = htons(err_param_len + asconf_param_len);
3001 sctp_addto_chunk(chunk, err_param_len, &err_param);
3003 /* Add the failed TLV copied from ASCONF chunk. */
3005 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3008 /* Process a asconf parameter. */
3009 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3010 struct sctp_chunk *asconf,
3011 struct sctp_addip_param *asconf_param)
3013 struct sctp_transport *peer;
3015 union sctp_addr addr;
3016 union sctp_addr_param *addr_param;
3018 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3020 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3021 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3022 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3023 return SCTP_ERROR_UNKNOWN_PARAM;
3025 switch (addr_param->p.type) {
3026 case SCTP_PARAM_IPV6_ADDRESS:
3027 if (!asoc->peer.ipv6_address)
3028 return SCTP_ERROR_DNS_FAILED;
3030 case SCTP_PARAM_IPV4_ADDRESS:
3031 if (!asoc->peer.ipv4_address)
3032 return SCTP_ERROR_DNS_FAILED;
3035 return SCTP_ERROR_DNS_FAILED;
3038 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3040 return SCTP_ERROR_DNS_FAILED;
3042 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
3044 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3045 * or multicast address.
3046 * (note: wildcard is permitted and requires special handling so
3047 * make sure we check for that)
3049 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3050 return SCTP_ERROR_DNS_FAILED;
3052 switch (asconf_param->param_hdr.type) {
3053 case SCTP_PARAM_ADD_IP:
3055 * If the address 0.0.0.0 or ::0 is provided, the source
3056 * address of the packet MUST be added.
3058 if (af->is_any(&addr))
3059 memcpy(&addr, &asconf->source, sizeof(addr));
3061 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3062 * request and does not have the local resources to add this
3063 * new address to the association, it MUST return an Error
3064 * Cause TLV set to the new error code 'Operation Refused
3065 * Due to Resource Shortage'.
3068 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3070 return SCTP_ERROR_RSRC_LOW;
3072 /* Start the heartbeat timer. */
3073 sctp_transport_reset_hb_timer(peer);
3074 asoc->new_transport = peer;
3076 case SCTP_PARAM_DEL_IP:
3077 /* ADDIP 4.3 D7) If a request is received to delete the
3078 * last remaining IP address of a peer endpoint, the receiver
3079 * MUST send an Error Cause TLV with the error cause set to the
3080 * new error code 'Request to Delete Last Remaining IP Address'.
3082 if (asoc->peer.transport_count == 1)
3083 return SCTP_ERROR_DEL_LAST_IP;
3085 /* ADDIP 4.3 D8) If a request is received to delete an IP
3086 * address which is also the source address of the IP packet
3087 * which contained the ASCONF chunk, the receiver MUST reject
3088 * this request. To reject the request the receiver MUST send
3089 * an Error Cause TLV set to the new error code 'Request to
3090 * Delete Source IP Address'
3092 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3093 return SCTP_ERROR_DEL_SRC_IP;
3096 * If the address 0.0.0.0 or ::0 is provided, all
3097 * addresses of the peer except the source address of the
3098 * packet MUST be deleted.
3100 if (af->is_any(&addr)) {
3101 sctp_assoc_set_primary(asoc, asconf->transport);
3102 sctp_assoc_del_nonprimary_peers(asoc,
3104 return SCTP_ERROR_NO_ERROR;
3107 /* If the address is not part of the association, the
3108 * ASCONF-ACK with Error Cause Indication Parameter
3109 * which including cause of Unresolvable Address should
3112 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3114 return SCTP_ERROR_DNS_FAILED;
3116 sctp_assoc_rm_peer(asoc, peer);
3118 case SCTP_PARAM_SET_PRIMARY:
3119 /* ADDIP Section 4.2.4
3120 * If the address 0.0.0.0 or ::0 is provided, the receiver
3121 * MAY mark the source address of the packet as its
3124 if (af->is_any(&addr))
3125 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3127 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3129 return SCTP_ERROR_DNS_FAILED;
3131 sctp_assoc_set_primary(asoc, peer);
3135 return SCTP_ERROR_NO_ERROR;
3138 /* Verify the ASCONF packet before we process it. */
3139 bool sctp_verify_asconf(const struct sctp_association *asoc,
3140 struct sctp_chunk *chunk, bool addr_param_needed,
3141 struct sctp_paramhdr **errp)
3143 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr;
3144 union sctp_params param;
3145 bool addr_param_seen = false;
3147 sctp_walk_params(param, addip, addip_hdr.params) {
3148 size_t length = ntohs(param.p->length);
3151 switch (param.p->type) {
3152 case SCTP_PARAM_ERR_CAUSE:
3154 case SCTP_PARAM_IPV4_ADDRESS:
3155 if (length != sizeof(struct sctp_ipv4addr_param))
3157 /* ensure there is only one addr param and it's in the
3158 * beginning of addip_hdr params, or we reject it.
3160 if (param.v != addip->addip_hdr.params)
3162 addr_param_seen = true;
3164 case SCTP_PARAM_IPV6_ADDRESS:
3165 if (length != sizeof(struct sctp_ipv6addr_param))
3167 if (param.v != addip->addip_hdr.params)
3169 addr_param_seen = true;
3171 case SCTP_PARAM_ADD_IP:
3172 case SCTP_PARAM_DEL_IP:
3173 case SCTP_PARAM_SET_PRIMARY:
3174 /* In ASCONF chunks, these need to be first. */
3175 if (addr_param_needed && !addr_param_seen)
3177 length = ntohs(param.addip->param_hdr.length);
3178 if (length < sizeof(struct sctp_addip_param) +
3182 case SCTP_PARAM_SUCCESS_REPORT:
3183 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3184 if (length != sizeof(struct sctp_addip_param))
3188 /* This is unkown to us, reject! */
3193 /* Remaining sanity checks. */
3194 if (addr_param_needed && !addr_param_seen)
3196 if (!addr_param_needed && addr_param_seen)
3198 if (param.v != chunk->chunk_end)
3204 /* Process an incoming ASCONF chunk with the next expected serial no. and
3205 * return an ASCONF_ACK chunk to be sent in response.
3207 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3208 struct sctp_chunk *asconf)
3210 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr;
3211 bool all_param_pass = true;
3212 union sctp_params param;
3213 struct sctp_addiphdr *hdr;
3214 union sctp_addr_param *addr_param;
3215 struct sctp_chunk *asconf_ack;
3221 chunk_len = ntohs(asconf->chunk_hdr->length) -
3222 sizeof(struct sctp_chunkhdr);
3223 hdr = (struct sctp_addiphdr *)asconf->skb->data;
3224 serial = ntohl(hdr->serial);
3226 /* Skip the addiphdr and store a pointer to address parameter. */
3227 length = sizeof(*hdr);
3228 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3229 chunk_len -= length;
3231 /* Skip the address parameter and store a pointer to the first
3234 length = ntohs(addr_param->p.length);
3235 chunk_len -= length;
3237 /* create an ASCONF_ACK chunk.
3238 * Based on the definitions of parameters, we know that the size of
3239 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3242 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3246 /* Process the TLVs contained within the ASCONF chunk. */
3247 sctp_walk_params(param, addip, addip_hdr.params) {
3248 /* Skip preceeding address parameters. */
3249 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3250 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3253 err_code = sctp_process_asconf_param(asoc, asconf,
3256 * If an error response is received for a TLV parameter,
3257 * all TLVs with no response before the failed TLV are
3258 * considered successful if not reported. All TLVs after
3259 * the failed response are considered unsuccessful unless
3260 * a specific success indication is present for the parameter.
3262 if (err_code != SCTP_ERROR_NO_ERROR)
3263 all_param_pass = false;
3264 if (!all_param_pass)
3265 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3266 err_code, param.addip);
3268 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3269 * an IP address sends an 'Out of Resource' in its response, it
3270 * MUST also fail any subsequent add or delete requests bundled
3273 if (err_code == SCTP_ERROR_RSRC_LOW)
3277 asoc->peer.addip_serial++;
3279 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3280 * after freeing the reference to old asconf ack if any.
3283 sctp_chunk_hold(asconf_ack);
3284 list_add_tail(&asconf_ack->transmitted_list,
3285 &asoc->asconf_ack_list);
3291 /* Process a asconf parameter that is successfully acked. */
3292 static void sctp_asconf_param_success(struct sctp_association *asoc,
3293 struct sctp_addip_param *asconf_param)
3296 union sctp_addr addr;
3297 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3298 union sctp_addr_param *addr_param;
3299 struct sctp_transport *transport;
3300 struct sctp_sockaddr_entry *saddr;
3302 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3304 /* We have checked the packet before, so we do not check again. */
3305 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3306 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
3308 switch (asconf_param->param_hdr.type) {
3309 case SCTP_PARAM_ADD_IP:
3310 /* This is always done in BH context with a socket lock
3311 * held, so the list can not change.
3314 list_for_each_entry(saddr, &bp->address_list, list) {
3315 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3316 saddr->state = SCTP_ADDR_SRC;
3319 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3321 sctp_transport_dst_release(transport);
3324 case SCTP_PARAM_DEL_IP:
3326 sctp_del_bind_addr(bp, &addr);
3327 if (asoc->asconf_addr_del_pending != NULL &&
3328 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3329 kfree(asoc->asconf_addr_del_pending);
3330 asoc->asconf_addr_del_pending = NULL;
3333 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3335 sctp_transport_dst_release(transport);
3343 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3344 * for the given asconf parameter. If there is no response for this parameter,
3345 * return the error code based on the third argument 'no_err'.
3347 * A7) If an error response is received for a TLV parameter, all TLVs with no
3348 * response before the failed TLV are considered successful if not reported.
3349 * All TLVs after the failed response are considered unsuccessful unless a
3350 * specific success indication is present for the parameter.
3352 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3353 struct sctp_addip_param *asconf_param,
3356 struct sctp_addip_param *asconf_ack_param;
3357 struct sctp_errhdr *err_param;
3363 err_code = SCTP_ERROR_NO_ERROR;
3365 err_code = SCTP_ERROR_REQ_REFUSED;
3367 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3368 sizeof(struct sctp_chunkhdr);
3370 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3371 * the first asconf_ack parameter.
3373 length = sizeof(struct sctp_addiphdr);
3374 asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data +
3376 asconf_ack_len -= length;
3378 while (asconf_ack_len > 0) {
3379 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3380 switch (asconf_ack_param->param_hdr.type) {
3381 case SCTP_PARAM_SUCCESS_REPORT:
3382 return SCTP_ERROR_NO_ERROR;
3383 case SCTP_PARAM_ERR_CAUSE:
3384 length = sizeof(*asconf_ack_param);
3385 err_param = (void *)asconf_ack_param + length;
3386 asconf_ack_len -= length;
3387 if (asconf_ack_len > 0)
3388 return err_param->cause;
3390 return SCTP_ERROR_INV_PARAM;
3393 return SCTP_ERROR_INV_PARAM;
3397 length = ntohs(asconf_ack_param->param_hdr.length);
3398 asconf_ack_param = (void *)asconf_ack_param + length;
3399 asconf_ack_len -= length;
3405 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3406 int sctp_process_asconf_ack(struct sctp_association *asoc,
3407 struct sctp_chunk *asconf_ack)
3409 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3410 union sctp_addr_param *addr_param;
3411 struct sctp_addip_param *asconf_param;
3413 int asconf_len = asconf->skb->len;
3414 int all_param_pass = 0;
3417 __be16 err_code = SCTP_ERROR_NO_ERROR;
3419 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3420 * a pointer to address parameter.
3422 length = sizeof(sctp_addip_chunk_t);
3423 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3424 asconf_len -= length;
3426 /* Skip the address parameter in the last asconf sent and store a
3427 * pointer to the first asconf parameter.
3429 length = ntohs(addr_param->p.length);
3430 asconf_param = (void *)addr_param + length;
3431 asconf_len -= length;
3434 * A8) If there is no response(s) to specific TLV parameter(s), and no
3435 * failures are indicated, then all request(s) are considered
3438 if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr))
3441 /* Process the TLVs contained in the last sent ASCONF chunk. */
3442 while (asconf_len > 0) {
3444 err_code = SCTP_ERROR_NO_ERROR;
3446 err_code = sctp_get_asconf_response(asconf_ack,
3449 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3454 case SCTP_ERROR_NO_ERROR:
3455 sctp_asconf_param_success(asoc, asconf_param);
3458 case SCTP_ERROR_RSRC_LOW:
3462 case SCTP_ERROR_UNKNOWN_PARAM:
3463 /* Disable sending this type of asconf parameter in
3466 asoc->peer.addip_disabled_mask |=
3467 asconf_param->param_hdr.type;
3470 case SCTP_ERROR_REQ_REFUSED:
3471 case SCTP_ERROR_DEL_LAST_IP:
3472 case SCTP_ERROR_DEL_SRC_IP:
3477 /* Skip the processed asconf parameter and move to the next
3480 length = ntohs(asconf_param->param_hdr.length);
3481 asconf_param = (void *)asconf_param + length;
3482 asconf_len -= length;
3485 if (no_err && asoc->src_out_of_asoc_ok) {
3486 asoc->src_out_of_asoc_ok = 0;
3487 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3490 /* Free the cached last sent asconf chunk. */
3491 list_del_init(&asconf->transmitted_list);
3492 sctp_chunk_free(asconf);
3493 asoc->addip_last_asconf = NULL;
3498 /* Make a FWD TSN chunk. */
3499 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3500 __u32 new_cum_tsn, size_t nstreams,
3501 struct sctp_fwdtsn_skip *skiplist)
3503 struct sctp_chunk *retval = NULL;
3504 struct sctp_fwdtsn_hdr ftsn_hdr;
3505 struct sctp_fwdtsn_skip skip;
3509 hint = (nstreams + 1) * sizeof(__u32);
3511 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3516 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3517 retval->subh.fwdtsn_hdr =
3518 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3520 for (i = 0; i < nstreams; i++) {
3521 skip.stream = skiplist[i].stream;
3522 skip.ssn = skiplist[i].ssn;
3523 sctp_addto_chunk(retval, sizeof(skip), &skip);
3529 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3531 * 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
3532 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3533 * | Type = 130 | Chunk Flags | Chunk Length |
3534 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3536 * / Re-configuration Parameter /
3538 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3540 * / Re-configuration Parameter (optional) /
3542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3544 static struct sctp_chunk *sctp_make_reconf(
3545 const struct sctp_association *asoc,
3548 struct sctp_reconf_chunk *reconf;
3549 struct sctp_chunk *retval;
3551 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3556 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3557 retval->param_hdr.v = reconf->params;
3562 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3564 * 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
3565 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3566 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3567 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3568 * | Re-configuration Request Sequence Number |
3569 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3570 * | Re-configuration Response Sequence Number |
3571 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3572 * | Sender's Last Assigned TSN |
3573 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3574 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3575 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3577 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3578 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3579 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3581 * RE-CONFIG 4.2 (STREAM IN RESET)
3583 * 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
3584 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3585 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3586 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3587 * | Re-configuration Request Sequence Number |
3588 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3589 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3590 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3592 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3593 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3594 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3596 struct sctp_chunk *sctp_make_strreset_req(
3597 const struct sctp_association *asoc,
3598 __u16 stream_num, __u16 *stream_list,
3601 struct sctp_strreset_outreq outreq;
3602 __u16 stream_len = stream_num * 2;
3603 struct sctp_strreset_inreq inreq;
3604 struct sctp_chunk *retval;
3605 __u16 outlen, inlen;
3607 outlen = (sizeof(outreq) + stream_len) * out;
3608 inlen = (sizeof(inreq) + stream_len) * in;
3610 retval = sctp_make_reconf(asoc, outlen + inlen);
3615 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3616 outreq.param_hdr.length = htons(outlen);
3617 outreq.request_seq = htonl(asoc->strreset_outseq);
3618 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3619 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3621 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3624 sctp_addto_chunk(retval, stream_len, stream_list);
3628 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3629 inreq.param_hdr.length = htons(inlen);
3630 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3632 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3635 sctp_addto_chunk(retval, stream_len, stream_list);
3641 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3643 * 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
3644 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3645 * | Parameter Type = 15 | Parameter Length = 8 |
3646 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3647 * | Re-configuration Request Sequence Number |
3648 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3650 struct sctp_chunk *sctp_make_strreset_tsnreq(
3651 const struct sctp_association *asoc)
3653 struct sctp_strreset_tsnreq tsnreq;
3654 __u16 length = sizeof(tsnreq);
3655 struct sctp_chunk *retval;
3657 retval = sctp_make_reconf(asoc, length);
3661 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3662 tsnreq.param_hdr.length = htons(length);
3663 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3665 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3670 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3672 * 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
3673 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3674 * | Parameter Type = 17 | Parameter Length = 12 |
3675 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3676 * | Re-configuration Request Sequence Number |
3677 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3678 * | Number of new streams | Reserved |
3679 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3681 struct sctp_chunk *sctp_make_strreset_addstrm(
3682 const struct sctp_association *asoc,
3683 __u16 out, __u16 in)
3685 struct sctp_strreset_addstrm addstrm;
3686 __u16 size = sizeof(addstrm);
3687 struct sctp_chunk *retval;
3689 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3694 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3695 addstrm.param_hdr.length = htons(size);
3696 addstrm.number_of_streams = htons(out);
3697 addstrm.request_seq = htonl(asoc->strreset_outseq);
3698 addstrm.reserved = 0;
3700 sctp_addto_chunk(retval, size, &addstrm);
3704 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3705 addstrm.param_hdr.length = htons(size);
3706 addstrm.number_of_streams = htons(in);
3707 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3708 addstrm.reserved = 0;
3710 sctp_addto_chunk(retval, size, &addstrm);
3716 /* RE-CONFIG 4.4 (RESP)
3718 * 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
3719 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3720 * | Parameter Type = 16 | Parameter Length |
3721 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3722 * | Re-configuration Response Sequence Number |
3723 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3725 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3727 struct sctp_chunk *sctp_make_strreset_resp(
3728 const struct sctp_association *asoc,
3729 __u32 result, __u32 sn)
3731 struct sctp_strreset_resp resp;
3732 __u16 length = sizeof(resp);
3733 struct sctp_chunk *retval;
3735 retval = sctp_make_reconf(asoc, length);
3739 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3740 resp.param_hdr.length = htons(length);
3741 resp.response_seq = htonl(sn);
3742 resp.result = htonl(result);
3744 sctp_addto_chunk(retval, sizeof(resp), &resp);
3749 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3751 * 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
3752 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3753 * | Parameter Type = 16 | Parameter Length |
3754 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3755 * | Re-configuration Response Sequence Number |
3756 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3758 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3759 * | Sender's Next TSN (optional) |
3760 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3761 * | Receiver's Next TSN (optional) |
3762 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3764 struct sctp_chunk *sctp_make_strreset_tsnresp(
3765 struct sctp_association *asoc,
3766 __u32 result, __u32 sn,
3767 __u32 sender_tsn, __u32 receiver_tsn)
3769 struct sctp_strreset_resptsn tsnresp;
3770 __u16 length = sizeof(tsnresp);
3771 struct sctp_chunk *retval;
3773 retval = sctp_make_reconf(asoc, length);
3777 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3778 tsnresp.param_hdr.length = htons(length);
3780 tsnresp.response_seq = htonl(sn);
3781 tsnresp.result = htonl(result);
3782 tsnresp.senders_next_tsn = htonl(sender_tsn);
3783 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3785 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3790 bool sctp_verify_reconf(const struct sctp_association *asoc,
3791 struct sctp_chunk *chunk,
3792 struct sctp_paramhdr **errp)
3794 struct sctp_reconf_chunk *hdr;
3795 union sctp_params param;
3796 __u16 last = 0, cnt = 0;
3798 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3799 sctp_walk_params(param, hdr, params) {
3800 __u16 length = ntohs(param.p->length);
3805 switch (param.p->type) {
3806 case SCTP_PARAM_RESET_OUT_REQUEST:
3807 if (length < sizeof(struct sctp_strreset_outreq) ||
3808 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3809 last != SCTP_PARAM_RESET_IN_REQUEST))
3812 case SCTP_PARAM_RESET_IN_REQUEST:
3813 if (length < sizeof(struct sctp_strreset_inreq) ||
3814 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3817 case SCTP_PARAM_RESET_RESPONSE:
3818 if ((length != sizeof(struct sctp_strreset_resp) &&
3819 length != sizeof(struct sctp_strreset_resptsn)) ||
3820 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3821 last != SCTP_PARAM_RESET_OUT_REQUEST))
3824 case SCTP_PARAM_RESET_TSN_REQUEST:
3826 sizeof(struct sctp_strreset_tsnreq) || last)
3829 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3830 if (length != sizeof(struct sctp_strreset_addstrm) ||
3831 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3834 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3835 if (length != sizeof(struct sctp_strreset_addstrm) ||
3836 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3843 last = param.p->type;