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_supported_ext_param ext_param;
221 struct sctp_adaptation_ind_param aiparam;
222 struct sctp_paramhdr *auth_chunks = NULL;
223 struct sctp_paramhdr *auth_hmacs = NULL;
224 struct sctp_supported_addrs_param sat;
225 struct sctp_endpoint *ep = asoc->ep;
226 struct sctp_chunk *retval = NULL;
227 int num_types, addrs_len = 0;
228 struct sctp_inithdr init;
229 union sctp_params addrs;
230 struct sctp_sock *sp;
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.
242 /* Convert the provided bind address list to raw format. */
243 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
245 init.init_tag = htonl(asoc->c.my_vtag);
246 init.a_rwnd = htonl(asoc->rwnd);
247 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
248 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
249 init.initial_tsn = htonl(asoc->c.initial_tsn);
251 /* How many address types are needed? */
252 sp = sctp_sk(asoc->base.sk);
253 num_types = sp->pf->supported_addrs(sp, types);
255 chunksize = sizeof(init) + addrs_len;
256 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
257 chunksize += sizeof(ecap_param);
259 if (asoc->prsctp_enable)
260 chunksize += sizeof(prsctp_param);
262 /* ADDIP: Section 4.2.7:
263 * An implementation supporting this extension [ADDIP] MUST list
264 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
265 * INIT-ACK parameters.
267 if (net->sctp.addip_enable) {
268 extensions[num_ext] = SCTP_CID_ASCONF;
269 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
273 if (asoc->reconf_enable) {
274 extensions[num_ext] = SCTP_CID_RECONF;
278 if (sp->adaptation_ind)
279 chunksize += sizeof(aiparam);
281 chunksize += vparam_len;
283 /* Account for AUTH related parameters */
284 if (ep->auth_enable) {
285 /* Add random parameter length*/
286 chunksize += sizeof(asoc->c.auth_random);
288 /* Add HMACS parameter length if any were defined */
289 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
290 if (auth_hmacs->length)
291 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
295 /* Add CHUNKS parameter length */
296 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
297 if (auth_chunks->length)
298 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
302 extensions[num_ext] = SCTP_CID_AUTH;
306 /* If we have any extensions to report, account for that */
308 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
310 /* RFC 2960 3.3.2 Initiation (INIT) (1)
312 * Note 3: An INIT chunk MUST NOT contain more than one Host
313 * Name address parameter. Moreover, the sender of the INIT
314 * MUST NOT combine any other address types with the Host Name
315 * address in the INIT. The receiver of INIT MUST ignore any
316 * other address types if the Host Name address parameter is
317 * present in the received INIT chunk.
319 * PLEASE DO NOT FIXME [This version does not support Host Name.]
322 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
326 retval->subh.init_hdr =
327 sctp_addto_chunk(retval, sizeof(init), &init);
328 retval->param_hdr.v =
329 sctp_addto_chunk(retval, addrs_len, addrs.v);
331 /* RFC 2960 3.3.2 Initiation (INIT) (1)
333 * Note 4: This parameter, when present, specifies all the
334 * address types the sending endpoint can support. The absence
335 * of this parameter indicates that the sending endpoint can
336 * support any address type.
338 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
339 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
340 sctp_addto_chunk(retval, sizeof(sat), &sat);
341 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
343 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
345 /* Add the supported extensions parameter. Be nice and add this
346 * fist before addiding the parameters for the extensions themselves
349 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
350 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
351 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
352 sctp_addto_param(retval, num_ext, extensions);
355 if (asoc->prsctp_enable)
356 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
358 if (sp->adaptation_ind) {
359 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
360 aiparam.param_hdr.length = htons(sizeof(aiparam));
361 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
362 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
365 /* Add SCTP-AUTH chunks to the parameter list */
366 if (ep->auth_enable) {
367 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
368 asoc->c.auth_random);
370 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
373 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
381 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
382 const struct sctp_chunk *chunk,
383 gfp_t gfp, int unkparam_len)
385 struct sctp_supported_ext_param ext_param;
386 struct sctp_adaptation_ind_param aiparam;
387 struct sctp_paramhdr *auth_chunks = NULL;
388 struct sctp_paramhdr *auth_random = NULL;
389 struct sctp_paramhdr *auth_hmacs = NULL;
390 struct sctp_chunk *retval = NULL;
391 struct sctp_cookie_param *cookie;
392 struct sctp_inithdr initack;
393 union sctp_params addrs;
394 struct sctp_sock *sp;
401 /* Note: there may be no addresses to embed. */
402 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
404 initack.init_tag = htonl(asoc->c.my_vtag);
405 initack.a_rwnd = htonl(asoc->rwnd);
406 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
407 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
408 initack.initial_tsn = htonl(asoc->c.initial_tsn);
410 /* FIXME: We really ought to build the cookie right
411 * into the packet instead of allocating more fresh memory.
413 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
418 /* Calculate the total size of allocation, include the reserved
419 * space for reporting unknown parameters if it is specified.
421 sp = sctp_sk(asoc->base.sk);
422 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
424 /* Tell peer that we'll do ECN only if peer advertised such cap. */
425 if (asoc->peer.ecn_capable)
426 chunksize += sizeof(ecap_param);
428 if (asoc->peer.prsctp_capable)
429 chunksize += sizeof(prsctp_param);
431 if (asoc->peer.asconf_capable) {
432 extensions[num_ext] = SCTP_CID_ASCONF;
433 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
437 if (asoc->peer.reconf_capable) {
438 extensions[num_ext] = SCTP_CID_RECONF;
442 if (sp->adaptation_ind)
443 chunksize += sizeof(aiparam);
445 if (asoc->peer.auth_capable) {
446 auth_random = (struct sctp_paramhdr *)asoc->c.auth_random;
447 chunksize += ntohs(auth_random->length);
449 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
450 if (auth_hmacs->length)
451 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
455 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
456 if (auth_chunks->length)
457 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
461 extensions[num_ext] = SCTP_CID_AUTH;
466 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
468 /* Now allocate and fill out the chunk. */
469 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
473 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
475 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
476 * HEARTBEAT ACK, * etc.) to the same destination transport
477 * address from which it received the DATA or control chunk
478 * to which it is replying.
480 * [INIT ACK back to where the INIT came from.]
482 retval->transport = chunk->transport;
484 retval->subh.init_hdr =
485 sctp_addto_chunk(retval, sizeof(initack), &initack);
486 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
487 sctp_addto_chunk(retval, cookie_len, cookie);
488 if (asoc->peer.ecn_capable)
489 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
491 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
492 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
493 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
494 sctp_addto_param(retval, num_ext, extensions);
496 if (asoc->peer.prsctp_capable)
497 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
499 if (sp->adaptation_ind) {
500 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
501 aiparam.param_hdr.length = htons(sizeof(aiparam));
502 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
503 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
506 if (asoc->peer.auth_capable) {
507 sctp_addto_chunk(retval, ntohs(auth_random->length),
510 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
513 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
517 /* We need to remove the const qualifier at this point. */
518 retval->asoc = (struct sctp_association *) asoc;
527 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
529 * This chunk is used only during the initialization of an association.
530 * It is sent by the initiator of an association to its peer to complete
531 * the initialization process. This chunk MUST precede any DATA chunk
532 * sent within the association, but MAY be bundled with one or more DATA
533 * chunks in the same packet.
536 * 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
537 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
538 * | Type = 10 |Chunk Flags | Length |
539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * Set to zero on transmit and ignored on receipt.
548 * Length: 16 bits (unsigned integer)
550 * Set to the size of the chunk in bytes, including the 4 bytes of
551 * the chunk header and the size of the Cookie.
553 * Cookie: variable size
555 * This field must contain the exact cookie received in the
556 * State Cookie parameter from the previous INIT ACK.
558 * An implementation SHOULD make the cookie as small as possible
559 * to insure interoperability.
561 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
562 const struct sctp_chunk *chunk)
564 struct sctp_chunk *retval;
568 cookie = asoc->peer.cookie;
569 cookie_len = asoc->peer.cookie_len;
571 /* Build a cookie echo chunk. */
572 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
573 cookie_len, GFP_ATOMIC);
576 retval->subh.cookie_hdr =
577 sctp_addto_chunk(retval, cookie_len, cookie);
579 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
581 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
582 * HEARTBEAT ACK, * etc.) to the same destination transport
583 * address from which it * received the DATA or control chunk
584 * to which it is replying.
586 * [COOKIE ECHO back to where the INIT ACK came from.]
589 retval->transport = chunk->transport;
595 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
597 * This chunk is used only during the initialization of an
598 * association. It is used to acknowledge the receipt of a COOKIE
599 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
600 * within the association, but MAY be bundled with one or more DATA
601 * chunks or SACK chunk in the same SCTP packet.
604 * 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
605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
606 * | Type = 11 |Chunk Flags | Length = 4 |
607 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
609 * Chunk Flags: 8 bits
611 * Set to zero on transmit and ignored on receipt.
613 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
614 const struct sctp_chunk *chunk)
616 struct sctp_chunk *retval;
618 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
620 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
622 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
623 * HEARTBEAT ACK, * etc.) to the same destination transport
624 * address from which it * received the DATA or control chunk
625 * to which it is replying.
627 * [COOKIE ACK back to where the COOKIE ECHO came from.]
630 retval->transport = chunk->transport;
636 * Appendix A: Explicit Congestion Notification:
639 * RFC 2481 details a specific bit for a sender to send in the header of
640 * its next outbound TCP segment to indicate to its peer that it has
641 * reduced its congestion window. This is termed the CWR bit. For
642 * SCTP the same indication is made by including the CWR chunk.
643 * This chunk contains one data element, i.e. the TSN number that
644 * was sent in the ECNE chunk. This element represents the lowest
645 * TSN number in the datagram that was originally marked with the
649 * 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
650 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
651 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
652 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
653 * | Lowest TSN Number |
654 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
656 * Note: The CWR is considered a Control chunk.
658 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
659 const __u32 lowest_tsn,
660 const struct sctp_chunk *chunk)
662 struct sctp_chunk *retval;
663 struct sctp_cwrhdr cwr;
665 cwr.lowest_tsn = htonl(lowest_tsn);
666 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
667 sizeof(cwr), GFP_ATOMIC);
672 retval->subh.ecn_cwr_hdr =
673 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
675 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
677 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
678 * HEARTBEAT ACK, * etc.) to the same destination transport
679 * address from which it * received the DATA or control chunk
680 * to which it is replying.
682 * [Report a reduced congestion window back to where the ECNE
686 retval->transport = chunk->transport;
692 /* Make an ECNE chunk. This is a congestion experienced report. */
693 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
694 const __u32 lowest_tsn)
696 struct sctp_chunk *retval;
697 struct sctp_ecnehdr ecne;
699 ecne.lowest_tsn = htonl(lowest_tsn);
700 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
701 sizeof(ecne), GFP_ATOMIC);
704 retval->subh.ecne_hdr =
705 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
711 /* Make a DATA chunk for the given association from the provided
712 * parameters. However, do not populate the data payload.
714 struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
715 const struct sctp_sndrcvinfo *sinfo,
716 int data_len, __u8 flags, __u16 ssn,
719 struct sctp_chunk *retval;
720 struct sctp_datahdr dp;
723 /* We assign the TSN as LATE as possible, not here when
724 * creating the chunk.
727 dp.stream = htons(sinfo->sinfo_stream);
728 dp.ppid = sinfo->sinfo_ppid;
730 /* Set the flags for an unordered send. */
731 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
732 flags |= SCTP_DATA_UNORDERED;
737 chunk_len = sizeof(dp) + data_len;
738 retval = sctp_make_data(asoc, flags, chunk_len, gfp);
742 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
743 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
749 /* Create a selective ackowledgement (SACK) for the given
750 * association. This reports on which TSN's we've seen to date,
751 * including duplicates and gaps.
753 struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
755 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
756 struct sctp_association *aptr = (struct sctp_association *)asoc;
757 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
758 __u16 num_gabs, num_dup_tsns;
759 struct sctp_transport *trans;
760 struct sctp_chunk *retval;
761 struct sctp_sackhdr sack;
765 memset(gabs, 0, sizeof(gabs));
766 ctsn = sctp_tsnmap_get_ctsn(map);
768 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
770 /* How much room is needed in the chunk? */
771 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
772 num_dup_tsns = sctp_tsnmap_num_dups(map);
774 /* Initialize the SACK header. */
775 sack.cum_tsn_ack = htonl(ctsn);
776 sack.a_rwnd = htonl(asoc->a_rwnd);
777 sack.num_gap_ack_blocks = htons(num_gabs);
778 sack.num_dup_tsns = htons(num_dup_tsns);
781 + sizeof(struct sctp_gap_ack_block) * num_gabs
782 + sizeof(__u32) * num_dup_tsns;
784 /* Create the chunk. */
785 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
789 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
791 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
792 * HEARTBEAT ACK, etc.) to the same destination transport
793 * address from which it received the DATA or control chunk to
794 * which it is replying. This rule should also be followed if
795 * the endpoint is bundling DATA chunks together with the
798 * However, when acknowledging multiple DATA chunks received
799 * in packets from different source addresses in a single
800 * SACK, the SACK chunk may be transmitted to one of the
801 * destination transport addresses from which the DATA or
802 * control chunks being acknowledged were received.
804 * [BUG: We do not implement the following paragraph.
805 * Perhaps we should remember the last transport we used for a
806 * SACK and avoid that (if possible) if we have seen any
807 * duplicates. --piggy]
809 * When a receiver of a duplicate DATA chunk sends a SACK to a
810 * multi- homed endpoint it MAY be beneficial to vary the
811 * destination address and not use the source address of the
812 * DATA chunk. The reason being that receiving a duplicate
813 * from a multi-homed endpoint might indicate that the return
814 * path (as specified in the source address of the DATA chunk)
815 * for the SACK is broken.
817 * [Send to the address from which we last received a DATA chunk.]
819 retval->transport = asoc->peer.last_data_from;
821 retval->subh.sack_hdr =
822 sctp_addto_chunk(retval, sizeof(sack), &sack);
824 /* Add the gap ack block information. */
826 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
829 /* Add the duplicate TSN information. */
831 aptr->stats.idupchunks += num_dup_tsns;
832 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
833 sctp_tsnmap_get_dups(map));
835 /* Once we have a sack generated, check to see what our sack
836 * generation is, if its 0, reset the transports to 0, and reset
837 * the association generation to 1
839 * The idea is that zero is never used as a valid generation for the
840 * association so no transport will match after a wrap event like this,
841 * Until the next sack
843 if (++aptr->peer.sack_generation == 0) {
844 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
846 trans->sack_generation = 0;
847 aptr->peer.sack_generation = 1;
853 /* Make a SHUTDOWN chunk. */
854 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
855 const struct sctp_chunk *chunk)
857 struct sctp_shutdownhdr shut;
858 struct sctp_chunk *retval;
861 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
862 shut.cum_tsn_ack = htonl(ctsn);
864 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
865 sizeof(shut), GFP_ATOMIC);
869 retval->subh.shutdown_hdr =
870 sctp_addto_chunk(retval, sizeof(shut), &shut);
873 retval->transport = chunk->transport;
878 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
879 const struct sctp_chunk *chunk)
881 struct sctp_chunk *retval;
883 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
886 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
888 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
889 * HEARTBEAT ACK, * etc.) to the same destination transport
890 * address from which it * received the DATA or control chunk
891 * to which it is replying.
893 * [ACK back to where the SHUTDOWN came from.]
896 retval->transport = chunk->transport;
901 struct sctp_chunk *sctp_make_shutdown_complete(
902 const struct sctp_association *asoc,
903 const struct sctp_chunk *chunk)
905 struct sctp_chunk *retval;
908 /* Set the T-bit if we have no association (vtag will be
911 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
913 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
916 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
918 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
919 * HEARTBEAT ACK, * etc.) to the same destination transport
920 * address from which it * received the DATA or control chunk
921 * to which it is replying.
923 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
927 retval->transport = chunk->transport;
932 /* Create an ABORT. Note that we set the T bit if we have no
933 * association, except when responding to an INIT (sctpimpguide 2.41).
935 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
936 const struct sctp_chunk *chunk,
939 struct sctp_chunk *retval;
942 /* Set the T-bit if we have no association and 'chunk' is not
943 * an INIT (vtag will be reflected).
946 if (chunk && chunk->chunk_hdr &&
947 chunk->chunk_hdr->type == SCTP_CID_INIT)
950 flags = SCTP_CHUNK_FLAG_T;
953 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
956 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
958 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
959 * HEARTBEAT ACK, * etc.) to the same destination transport
960 * address from which it * received the DATA or control chunk
961 * to which it is replying.
963 * [ABORT back to where the offender came from.]
966 retval->transport = chunk->transport;
971 /* Helper to create ABORT with a NO_USER_DATA error. */
972 struct sctp_chunk *sctp_make_abort_no_data(
973 const struct sctp_association *asoc,
974 const struct sctp_chunk *chunk,
977 struct sctp_chunk *retval;
980 retval = sctp_make_abort(asoc, chunk,
981 sizeof(struct sctp_errhdr) + sizeof(tsn));
986 /* Put the tsn back into network byte order. */
987 payload = htonl(tsn);
988 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
989 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
991 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
993 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
994 * HEARTBEAT ACK, * etc.) to the same destination transport
995 * address from which it * received the DATA or control chunk
996 * to which it is replying.
998 * [ABORT back to where the offender came from.]
1001 retval->transport = chunk->transport;
1007 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1008 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1012 struct sctp_chunk *retval;
1013 void *payload = NULL;
1016 retval = sctp_make_abort(asoc, NULL,
1017 sizeof(struct sctp_errhdr) + paylen);
1022 /* Put the msg_iov together into payload. */
1023 payload = kmalloc(paylen, GFP_KERNEL);
1027 err = memcpy_from_msg(payload, msg, paylen);
1032 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1033 sctp_addto_chunk(retval, paylen, payload);
1043 sctp_chunk_free(retval);
1049 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1052 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1055 int chunklen = ntohs(chunk->chunk_hdr->length);
1058 target = skb_put(chunk->skb, len);
1061 memcpy(target, data, len);
1063 memset(target, 0, len);
1065 /* Adjust the chunk length field. */
1066 chunk->chunk_hdr->length = htons(chunklen + len);
1067 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1072 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1073 struct sctp_chunk *sctp_make_abort_violation(
1074 const struct sctp_association *asoc,
1075 const struct sctp_chunk *chunk,
1076 const __u8 *payload,
1077 const size_t paylen)
1079 struct sctp_chunk *retval;
1080 struct sctp_paramhdr phdr;
1082 retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) +
1083 paylen + sizeof(phdr));
1087 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen +
1090 phdr.type = htons(chunk->chunk_hdr->type);
1091 phdr.length = chunk->chunk_hdr->length;
1092 sctp_addto_chunk(retval, paylen, payload);
1093 sctp_addto_param(retval, sizeof(phdr), &phdr);
1099 struct sctp_chunk *sctp_make_violation_paramlen(
1100 const struct sctp_association *asoc,
1101 const struct sctp_chunk *chunk,
1102 struct sctp_paramhdr *param)
1104 static const char error[] = "The following parameter had invalid length:";
1105 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) +
1107 struct sctp_chunk *retval;
1109 retval = sctp_make_abort(asoc, chunk, payload_len);
1113 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1114 sizeof(error) + sizeof(*param));
1115 sctp_addto_chunk(retval, sizeof(error), error);
1116 sctp_addto_param(retval, sizeof(*param), param);
1122 struct sctp_chunk *sctp_make_violation_max_retrans(
1123 const struct sctp_association *asoc,
1124 const struct sctp_chunk *chunk)
1126 static const char error[] = "Association exceeded its max_retans count";
1127 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr);
1128 struct sctp_chunk *retval;
1130 retval = sctp_make_abort(asoc, chunk, payload_len);
1134 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1135 sctp_addto_chunk(retval, sizeof(error), error);
1141 /* Make a HEARTBEAT chunk. */
1142 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1143 const struct sctp_transport *transport)
1145 struct sctp_sender_hb_info hbinfo;
1146 struct sctp_chunk *retval;
1148 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1149 sizeof(hbinfo), GFP_ATOMIC);
1154 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1155 hbinfo.param_hdr.length = htons(sizeof(hbinfo));
1156 hbinfo.daddr = transport->ipaddr;
1157 hbinfo.sent_at = jiffies;
1158 hbinfo.hb_nonce = transport->hb_nonce;
1160 /* Cast away the 'const', as this is just telling the chunk
1161 * what transport it belongs to.
1163 retval->transport = (struct sctp_transport *) transport;
1164 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1171 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1172 const struct sctp_chunk *chunk,
1173 const void *payload,
1174 const size_t paylen)
1176 struct sctp_chunk *retval;
1178 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1183 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1185 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1187 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1188 * HEARTBEAT ACK, * etc.) to the same destination transport
1189 * address from which it * received the DATA or control chunk
1190 * to which it is replying.
1192 * [HBACK back to where the HEARTBEAT came from.]
1195 retval->transport = chunk->transport;
1201 /* Create an Operation Error chunk with the specified space reserved.
1202 * This routine can be used for containing multiple causes in the chunk.
1204 static struct sctp_chunk *sctp_make_op_error_space(
1205 const struct sctp_association *asoc,
1206 const struct sctp_chunk *chunk,
1209 struct sctp_chunk *retval;
1211 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1212 sizeof(struct sctp_errhdr) + size,
1217 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1219 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1220 * HEARTBEAT ACK, etc.) to the same destination transport
1221 * address from which it received the DATA or control chunk
1222 * to which it is replying.
1226 retval->transport = chunk->transport;
1232 /* Create an Operation Error chunk of a fixed size,
1233 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1234 * This is a helper function to allocate an error chunk for
1235 * for those invalid parameter codes in which we may not want
1236 * to report all the errors, if the incoming chunk is large
1238 static inline struct sctp_chunk *sctp_make_op_error_fixed(
1239 const struct sctp_association *asoc,
1240 const struct sctp_chunk *chunk)
1242 size_t size = asoc ? asoc->pathmtu : 0;
1245 size = SCTP_DEFAULT_MAXSEGMENT;
1247 return sctp_make_op_error_space(asoc, chunk, size);
1250 /* Create an Operation Error chunk. */
1251 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1252 const struct sctp_chunk *chunk,
1253 __be16 cause_code, const void *payload,
1254 size_t paylen, size_t reserve_tail)
1256 struct sctp_chunk *retval;
1258 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1262 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1263 sctp_addto_chunk(retval, paylen, payload);
1265 sctp_addto_param(retval, reserve_tail, NULL);
1271 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1273 struct sctp_authhdr auth_hdr;
1274 struct sctp_hmac *hmac_desc;
1275 struct sctp_chunk *retval;
1278 /* Get the first hmac that the peer told us to use */
1279 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1280 if (unlikely(!hmac_desc))
1283 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1284 hmac_desc->hmac_len + sizeof(auth_hdr),
1289 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1290 auth_hdr.shkey_id = htons(asoc->active_key_id);
1292 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr),
1295 hmac = skb_put_zero(retval->skb, hmac_desc->hmac_len);
1297 /* Adjust the chunk header to include the empty MAC */
1298 retval->chunk_hdr->length =
1299 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1300 retval->chunk_end = skb_tail_pointer(retval->skb);
1306 /********************************************************************
1307 * 2nd Level Abstractions
1308 ********************************************************************/
1310 /* Turn an skb into a chunk.
1311 * FIXME: Eventually move the structure directly inside the skb->cb[].
1313 * sctpimpguide-05.txt Section 2.8.2
1314 * M1) Each time a new DATA chunk is transmitted
1315 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1316 * 'TSN.Missing.Report' count will be used to determine missing chunks
1317 * and when to fast retransmit.
1320 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1321 const struct sctp_association *asoc,
1322 struct sock *sk, gfp_t gfp)
1324 struct sctp_chunk *retval;
1326 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1331 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1333 INIT_LIST_HEAD(&retval->list);
1335 retval->asoc = (struct sctp_association *)asoc;
1336 retval->singleton = 1;
1338 retval->fast_retransmit = SCTP_CAN_FRTX;
1340 /* Polish the bead hole. */
1341 INIT_LIST_HEAD(&retval->transmitted_list);
1342 INIT_LIST_HEAD(&retval->frag_list);
1343 SCTP_DBG_OBJCNT_INC(chunk);
1344 refcount_set(&retval->refcnt, 1);
1350 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1351 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1352 union sctp_addr *dest)
1354 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1355 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1358 /* Extract the source address from a chunk. */
1359 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1361 /* If we have a known transport, use that. */
1362 if (chunk->transport) {
1363 return &chunk->transport->ipaddr;
1365 /* Otherwise, extract it from the IP header. */
1366 return &chunk->source;
1370 /* Create a new chunk, setting the type and flags headers from the
1371 * arguments, reserving enough space for a 'paylen' byte payload.
1373 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1374 __u8 type, __u8 flags, int paylen,
1377 struct sctp_chunkhdr *chunk_hdr;
1378 struct sctp_chunk *retval;
1379 struct sk_buff *skb;
1382 /* No need to allocate LL here, as this is only a chunk. */
1383 skb = alloc_skb(SCTP_PAD4(sizeof(*chunk_hdr) + paylen), gfp);
1387 /* Make room for the chunk header. */
1388 chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr));
1389 chunk_hdr->type = type;
1390 chunk_hdr->flags = flags;
1391 chunk_hdr->length = htons(sizeof(*chunk_hdr));
1393 sk = asoc ? asoc->base.sk : NULL;
1394 retval = sctp_chunkify(skb, asoc, sk, gfp);
1400 retval->chunk_hdr = chunk_hdr;
1401 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr);
1403 /* Determine if the chunk needs to be authenticated */
1404 if (sctp_auth_send_cid(type, asoc))
1412 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1413 __u8 flags, int paylen, gfp_t gfp)
1415 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1418 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1419 __u8 type, __u8 flags, int paylen,
1422 struct sctp_chunk *chunk;
1424 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1426 sctp_control_set_owner_w(chunk);
1431 /* Release the memory occupied by a chunk. */
1432 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1434 BUG_ON(!list_empty(&chunk->list));
1435 list_del_init(&chunk->transmitted_list);
1437 consume_skb(chunk->skb);
1438 consume_skb(chunk->auth_chunk);
1440 SCTP_DBG_OBJCNT_DEC(chunk);
1441 kmem_cache_free(sctp_chunk_cachep, chunk);
1444 /* Possibly, free the chunk. */
1445 void sctp_chunk_free(struct sctp_chunk *chunk)
1447 /* Release our reference on the message tracker. */
1449 sctp_datamsg_put(chunk->msg);
1451 sctp_chunk_put(chunk);
1454 /* Grab a reference to the chunk. */
1455 void sctp_chunk_hold(struct sctp_chunk *ch)
1457 refcount_inc(&ch->refcnt);
1460 /* Release a reference to the chunk. */
1461 void sctp_chunk_put(struct sctp_chunk *ch)
1463 if (refcount_dec_and_test(&ch->refcnt))
1464 sctp_chunk_destroy(ch);
1467 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1470 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1472 int chunklen = ntohs(chunk->chunk_hdr->length);
1473 int padlen = SCTP_PAD4(chunklen) - chunklen;
1476 skb_put_zero(chunk->skb, padlen);
1477 target = skb_put_data(chunk->skb, data, len);
1479 /* Adjust the chunk length field. */
1480 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1481 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1486 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1487 * space in the chunk
1489 static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1490 int len, const void *data)
1492 if (skb_tailroom(chunk->skb) >= len)
1493 return sctp_addto_chunk(chunk, len, data);
1498 /* Append bytes from user space to the end of a chunk. Will panic if
1499 * chunk is not big enough.
1500 * Returns a kernel err value.
1502 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1503 struct iov_iter *from)
1507 /* Make room in chunk for data. */
1508 target = skb_put(chunk->skb, len);
1510 /* Copy data (whole iovec) into chunk */
1511 if (!copy_from_iter_full(target, len, from))
1514 /* Adjust the chunk length field. */
1515 chunk->chunk_hdr->length =
1516 htons(ntohs(chunk->chunk_hdr->length) + len);
1517 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1522 /* Helper function to assign a TSN if needed. This assumes that both
1523 * the data_hdr and association have already been assigned.
1525 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1527 struct sctp_stream *stream;
1528 struct sctp_chunk *lchunk;
1529 struct sctp_datamsg *msg;
1535 /* All fragments will be on the same stream */
1536 sid = ntohs(chunk->subh.data_hdr->stream);
1537 stream = &chunk->asoc->stream;
1539 /* Now assign the sequence number to the entire message.
1540 * All fragments must have the same stream sequence number.
1543 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1544 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1547 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1548 ssn = sctp_ssn_next(stream, out, sid);
1550 ssn = sctp_ssn_peek(stream, out, sid);
1553 lchunk->subh.data_hdr->ssn = htons(ssn);
1554 lchunk->has_ssn = 1;
1558 /* Helper function to assign a TSN if needed. This assumes that both
1559 * the data_hdr and association have already been assigned.
1561 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1563 if (!chunk->has_tsn) {
1564 /* This is the last possible instant to
1567 chunk->subh.data_hdr->tsn =
1568 htonl(sctp_association_get_next_tsn(chunk->asoc));
1573 /* Create a CLOSED association to use with an incoming packet. */
1574 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1575 struct sctp_chunk *chunk,
1578 struct sctp_association *asoc;
1579 enum sctp_scope scope;
1580 struct sk_buff *skb;
1582 /* Create the bare association. */
1583 scope = sctp_scope(sctp_source(chunk));
1584 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1589 /* Create an entry for the source address of the packet. */
1590 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1596 /* Build a cookie representing asoc.
1597 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1599 static struct sctp_cookie_param *sctp_pack_cookie(
1600 const struct sctp_endpoint *ep,
1601 const struct sctp_association *asoc,
1602 const struct sctp_chunk *init_chunk,
1603 int *cookie_len, const __u8 *raw_addrs,
1606 struct sctp_signed_cookie *cookie;
1607 struct sctp_cookie_param *retval;
1608 int headersize, bodysize;
1610 /* Header size is static data prior to the actual cookie, including
1613 headersize = sizeof(struct sctp_paramhdr) +
1614 (sizeof(struct sctp_signed_cookie) -
1615 sizeof(struct sctp_cookie));
1616 bodysize = sizeof(struct sctp_cookie)
1617 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1619 /* Pad out the cookie to a multiple to make the signature
1620 * functions simpler to write.
1622 if (bodysize % SCTP_COOKIE_MULTIPLE)
1623 bodysize += SCTP_COOKIE_MULTIPLE
1624 - (bodysize % SCTP_COOKIE_MULTIPLE);
1625 *cookie_len = headersize + bodysize;
1627 /* Clear this memory since we are sending this data structure
1628 * out on the network.
1630 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1634 cookie = (struct sctp_signed_cookie *) retval->body;
1636 /* Set up the parameter header. */
1637 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1638 retval->p.length = htons(*cookie_len);
1640 /* Copy the cookie part of the association itself. */
1641 cookie->c = asoc->c;
1642 /* Save the raw address list length in the cookie. */
1643 cookie->c.raw_addr_list_len = addrs_len;
1645 /* Remember PR-SCTP capability. */
1646 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1648 /* Save adaptation indication in the cookie. */
1649 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1651 /* Set an expiration time for the cookie. */
1652 cookie->c.expiration = ktime_add(asoc->cookie_life,
1655 /* Copy the peer's init packet. */
1656 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1657 ntohs(init_chunk->chunk_hdr->length));
1659 /* Copy the raw local address list of the association. */
1660 memcpy((__u8 *)&cookie->c.peer_init[0] +
1661 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1663 if (sctp_sk(ep->base.sk)->hmac) {
1664 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1667 /* Sign the message. */
1668 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1671 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1672 sizeof(ep->secret_key)) ?:
1673 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1675 shash_desc_zero(desc);
1689 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1690 struct sctp_association *sctp_unpack_cookie(
1691 const struct sctp_endpoint *ep,
1692 const struct sctp_association *asoc,
1693 struct sctp_chunk *chunk, gfp_t gfp,
1694 int *error, struct sctp_chunk **errp)
1696 struct sctp_association *retval = NULL;
1697 int headersize, bodysize, fixed_size;
1698 struct sctp_signed_cookie *cookie;
1699 struct sk_buff *skb = chunk->skb;
1700 struct sctp_cookie *bear_cookie;
1701 __u8 *digest = ep->digest;
1702 enum sctp_scope scope;
1706 /* Header size is static data prior to the actual cookie, including
1709 headersize = sizeof(struct sctp_chunkhdr) +
1710 (sizeof(struct sctp_signed_cookie) -
1711 sizeof(struct sctp_cookie));
1712 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1713 fixed_size = headersize + sizeof(struct sctp_cookie);
1715 /* Verify that the chunk looks like it even has a cookie.
1716 * There must be enough room for our cookie and our peer's
1719 len = ntohs(chunk->chunk_hdr->length);
1720 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1723 /* Verify that the cookie has been padded out. */
1724 if (bodysize % SCTP_COOKIE_MULTIPLE)
1727 /* Process the cookie. */
1728 cookie = chunk->subh.cookie_hdr;
1729 bear_cookie = &cookie->c;
1731 if (!sctp_sk(ep->base.sk)->hmac)
1734 /* Check the signature. */
1736 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1739 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1742 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1743 sizeof(ep->secret_key)) ?:
1744 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1746 shash_desc_zero(desc);
1749 *error = -SCTP_IERROR_NOMEM;
1754 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1755 *error = -SCTP_IERROR_BAD_SIG;
1760 /* IG Section 2.35.2:
1761 * 3) Compare the port numbers and the verification tag contained
1762 * within the COOKIE ECHO chunk to the actual port numbers and the
1763 * verification tag within the SCTP common header of the received
1764 * packet. If these values do not match the packet MUST be silently
1767 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1768 *error = -SCTP_IERROR_BAD_TAG;
1772 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1773 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1774 *error = -SCTP_IERROR_BAD_PORTS;
1778 /* Check to see if the cookie is stale. If there is already
1779 * an association, there is no need to check cookie's expiration
1780 * for init collision case of lost COOKIE ACK.
1781 * If skb has been timestamped, then use the stamp, otherwise
1782 * use current time. This introduces a small possibility that
1783 * that a cookie may be considered expired, but his would only slow
1784 * down the new association establishment instead of every packet.
1786 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1787 kt = skb_get_ktime(skb);
1789 kt = ktime_get_real();
1791 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
1793 * Section 3.3.10.3 Stale Cookie Error (3)
1797 * Stale Cookie Error: Indicates the receipt of a valid State
1798 * Cookie that has expired.
1800 len = ntohs(chunk->chunk_hdr->length);
1801 *errp = sctp_make_op_error_space(asoc, chunk, len);
1803 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1804 __be32 n = htonl(usecs);
1806 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
1808 sctp_addto_chunk(*errp, sizeof(n), &n);
1809 *error = -SCTP_IERROR_STALE_COOKIE;
1811 *error = -SCTP_IERROR_NOMEM;
1816 /* Make a new base association. */
1817 scope = sctp_scope(sctp_source(chunk));
1818 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1820 *error = -SCTP_IERROR_NOMEM;
1824 /* Set up our peer's port number. */
1825 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1827 /* Populate the association from the cookie. */
1828 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1830 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1832 *error = -SCTP_IERROR_NOMEM;
1836 /* Also, add the destination address. */
1837 if (list_empty(&retval->base.bind_addr.address_list)) {
1838 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1839 sizeof(chunk->dest), SCTP_ADDR_SRC,
1843 retval->next_tsn = retval->c.initial_tsn;
1844 retval->ctsn_ack_point = retval->next_tsn - 1;
1845 retval->addip_serial = retval->c.initial_tsn;
1846 retval->strreset_outseq = retval->c.initial_tsn;
1847 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1848 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1849 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1851 /* The INIT stuff will be done by the side effects. */
1856 sctp_association_free(retval);
1861 /* Yikes! The packet is either corrupt or deliberately
1864 *error = -SCTP_IERROR_MALFORMED;
1868 /********************************************************************
1869 * 3rd Level Abstractions
1870 ********************************************************************/
1872 struct __sctp_missing {
1878 * Report a missing mandatory parameter.
1880 static int sctp_process_missing_param(const struct sctp_association *asoc,
1881 enum sctp_param paramtype,
1882 struct sctp_chunk *chunk,
1883 struct sctp_chunk **errp)
1885 struct __sctp_missing report;
1888 len = SCTP_PAD4(sizeof(report));
1890 /* Make an ERROR chunk, preparing enough room for
1891 * returning multiple unknown parameters.
1894 *errp = sctp_make_op_error_space(asoc, chunk, len);
1897 report.num_missing = htonl(1);
1898 report.type = paramtype;
1899 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1901 sctp_addto_chunk(*errp, sizeof(report), &report);
1904 /* Stop processing this chunk. */
1908 /* Report an Invalid Mandatory Parameter. */
1909 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1910 struct sctp_chunk *chunk,
1911 struct sctp_chunk **errp)
1913 /* Invalid Mandatory Parameter Error has no payload. */
1916 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1919 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1921 /* Stop processing this chunk. */
1925 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1926 struct sctp_paramhdr *param,
1927 const struct sctp_chunk *chunk,
1928 struct sctp_chunk **errp)
1930 /* This is a fatal error. Any accumulated non-fatal errors are
1934 sctp_chunk_free(*errp);
1936 /* Create an error chunk and fill it in with our payload. */
1937 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1943 /* Do not attempt to handle the HOST_NAME parm. However, do
1944 * send back an indicator to the peer.
1946 static int sctp_process_hn_param(const struct sctp_association *asoc,
1947 union sctp_params param,
1948 struct sctp_chunk *chunk,
1949 struct sctp_chunk **errp)
1951 __u16 len = ntohs(param.p->length);
1953 /* Processing of the HOST_NAME parameter will generate an
1954 * ABORT. If we've accumulated any non-fatal errors, they
1955 * would be unrecognized parameters and we should not include
1956 * them in the ABORT.
1959 sctp_chunk_free(*errp);
1961 *errp = sctp_make_op_error_space(asoc, chunk, len);
1964 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1965 sctp_addto_chunk(*errp, len, param.v);
1968 /* Stop processing this chunk. */
1972 static int sctp_verify_ext_param(struct net *net, union sctp_params param)
1974 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
1975 int have_asconf = 0;
1979 for (i = 0; i < num_ext; i++) {
1980 switch (param.ext->chunks[i]) {
1984 case SCTP_CID_ASCONF:
1985 case SCTP_CID_ASCONF_ACK:
1991 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1992 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1993 * only if ADD-IP is turned on and we are not backward-compatible
1996 if (net->sctp.addip_noauth)
1999 if (net->sctp.addip_enable && !have_auth && have_asconf)
2005 static void sctp_process_ext_param(struct sctp_association *asoc,
2006 union sctp_params param)
2008 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2009 struct net *net = sock_net(asoc->base.sk);
2012 for (i = 0; i < num_ext; i++) {
2013 switch (param.ext->chunks[i]) {
2014 case SCTP_CID_RECONF:
2015 if (asoc->reconf_enable &&
2016 !asoc->peer.reconf_capable)
2017 asoc->peer.reconf_capable = 1;
2019 case SCTP_CID_FWD_TSN:
2020 if (asoc->prsctp_enable && !asoc->peer.prsctp_capable)
2021 asoc->peer.prsctp_capable = 1;
2024 /* if the peer reports AUTH, assume that he
2027 if (asoc->ep->auth_enable)
2028 asoc->peer.auth_capable = 1;
2030 case SCTP_CID_ASCONF:
2031 case SCTP_CID_ASCONF_ACK:
2032 if (net->sctp.addip_enable)
2033 asoc->peer.asconf_capable = 1;
2041 /* RFC 3.2.1 & the Implementers Guide 2.2.
2043 * The Parameter Types are encoded such that the
2044 * highest-order two bits specify the action that must be
2045 * taken if the processing endpoint does not recognize the
2048 * 00 - Stop processing this parameter; do not process any further
2049 * parameters within this chunk
2051 * 01 - Stop processing this parameter, do not process any further
2052 * parameters within this chunk, and report the unrecognized
2053 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2055 * 10 - Skip this parameter and continue processing.
2057 * 11 - Skip this parameter and continue processing but
2058 * report the unrecognized parameter in an
2059 * 'Unrecognized Parameter' ERROR chunk.
2062 * SCTP_IERROR_NO_ERROR - continue with the chunk
2063 * SCTP_IERROR_ERROR - stop and report an error.
2064 * SCTP_IERROR_NOMEME - out of memory.
2066 static enum sctp_ierror sctp_process_unk_param(
2067 const struct sctp_association *asoc,
2068 union sctp_params param,
2069 struct sctp_chunk *chunk,
2070 struct sctp_chunk **errp)
2072 int retval = SCTP_IERROR_NO_ERROR;
2074 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2075 case SCTP_PARAM_ACTION_DISCARD:
2076 retval = SCTP_IERROR_ERROR;
2078 case SCTP_PARAM_ACTION_SKIP:
2080 case SCTP_PARAM_ACTION_DISCARD_ERR:
2081 retval = SCTP_IERROR_ERROR;
2083 case SCTP_PARAM_ACTION_SKIP_ERR:
2084 /* Make an ERROR chunk, preparing enough room for
2085 * returning multiple unknown parameters.
2088 *errp = sctp_make_op_error_fixed(asoc, chunk);
2091 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2092 SCTP_PAD4(ntohs(param.p->length))))
2093 sctp_addto_chunk_fixed(*errp,
2094 SCTP_PAD4(ntohs(param.p->length)),
2097 /* If there is no memory for generating the ERROR
2098 * report as specified, an ABORT will be triggered
2099 * to the peer and the association won't be
2102 retval = SCTP_IERROR_NOMEM;
2112 /* Verify variable length parameters
2114 * SCTP_IERROR_ABORT - trigger an ABORT
2115 * SCTP_IERROR_NOMEM - out of memory (abort)
2116 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2117 * SCTP_IERROR_NO_ERROR - continue with the chunk
2119 static enum sctp_ierror sctp_verify_param(struct net *net,
2120 const struct sctp_endpoint *ep,
2121 const struct sctp_association *asoc,
2122 union sctp_params param,
2124 struct sctp_chunk *chunk,
2125 struct sctp_chunk **err_chunk)
2127 struct sctp_hmac_algo_param *hmacs;
2128 int retval = SCTP_IERROR_NO_ERROR;
2129 __u16 n_elt, id = 0;
2132 /* FIXME - This routine is not looking at each parameter per the
2133 * chunk type, i.e., unrecognized parameters should be further
2134 * identified based on the chunk id.
2137 switch (param.p->type) {
2138 case SCTP_PARAM_IPV4_ADDRESS:
2139 case SCTP_PARAM_IPV6_ADDRESS:
2140 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2141 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2142 case SCTP_PARAM_STATE_COOKIE:
2143 case SCTP_PARAM_HEARTBEAT_INFO:
2144 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2145 case SCTP_PARAM_ECN_CAPABLE:
2146 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2149 case SCTP_PARAM_SUPPORTED_EXT:
2150 if (!sctp_verify_ext_param(net, param))
2151 return SCTP_IERROR_ABORT;
2154 case SCTP_PARAM_SET_PRIMARY:
2155 if (net->sctp.addip_enable)
2159 case SCTP_PARAM_HOST_NAME_ADDRESS:
2160 /* Tell the peer, we won't support this param. */
2161 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2162 retval = SCTP_IERROR_ABORT;
2165 case SCTP_PARAM_FWD_TSN_SUPPORT:
2166 if (ep->prsctp_enable)
2170 case SCTP_PARAM_RANDOM:
2171 if (!ep->auth_enable)
2174 /* SCTP-AUTH: Secion 6.1
2175 * If the random number is not 32 byte long the association
2176 * MUST be aborted. The ABORT chunk SHOULD contain the error
2177 * cause 'Protocol Violation'.
2179 if (SCTP_AUTH_RANDOM_LENGTH !=
2180 ntohs(param.p->length) - sizeof(struct sctp_paramhdr)) {
2181 sctp_process_inv_paramlength(asoc, param.p,
2183 retval = SCTP_IERROR_ABORT;
2187 case SCTP_PARAM_CHUNKS:
2188 if (!ep->auth_enable)
2191 /* SCTP-AUTH: Section 3.2
2192 * The CHUNKS parameter MUST be included once in the INIT or
2193 * INIT-ACK chunk if the sender wants to receive authenticated
2194 * chunks. Its maximum length is 260 bytes.
2196 if (260 < ntohs(param.p->length)) {
2197 sctp_process_inv_paramlength(asoc, param.p,
2199 retval = SCTP_IERROR_ABORT;
2203 case SCTP_PARAM_HMAC_ALGO:
2204 if (!ep->auth_enable)
2207 hmacs = (struct sctp_hmac_algo_param *)param.p;
2208 n_elt = (ntohs(param.p->length) -
2209 sizeof(struct sctp_paramhdr)) >> 1;
2211 /* SCTP-AUTH: Section 6.1
2212 * The HMAC algorithm based on SHA-1 MUST be supported and
2213 * included in the HMAC-ALGO parameter.
2215 for (i = 0; i < n_elt; i++) {
2216 id = ntohs(hmacs->hmac_ids[i]);
2218 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2222 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2223 sctp_process_inv_paramlength(asoc, param.p, chunk,
2225 retval = SCTP_IERROR_ABORT;
2230 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2231 __func__, ntohs(param.p->type), cid);
2233 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2239 /* Verify the INIT packet before we process it. */
2240 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2241 const struct sctp_association *asoc, enum sctp_cid cid,
2242 struct sctp_init_chunk *peer_init,
2243 struct sctp_chunk *chunk, struct sctp_chunk **errp)
2245 union sctp_params param;
2246 bool has_cookie = false;
2249 /* Check for missing mandatory parameters. Note: Initial TSN is
2250 * also mandatory, but is not checked here since the valid range
2251 * is 0..2**32-1. RFC4960, section 3.3.3.
2253 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2254 peer_init->init_hdr.num_inbound_streams == 0 ||
2255 peer_init->init_hdr.init_tag == 0 ||
2256 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2257 return sctp_process_inv_mandatory(asoc, chunk, errp);
2259 sctp_walk_params(param, peer_init, init_hdr.params) {
2260 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2264 /* There is a possibility that a parameter length was bad and
2265 * in that case we would have stoped walking the parameters.
2266 * The current param.p would point at the bad one.
2267 * Current consensus on the mailing list is to generate a PROTOCOL
2268 * VIOLATION error. We build the ERROR chunk here and let the normal
2269 * error handling code build and send the packet.
2271 if (param.v != (void *)chunk->chunk_end)
2272 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2274 /* The only missing mandatory param possible today is
2275 * the state cookie for an INIT-ACK chunk.
2277 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2278 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2281 /* Verify all the variable length parameters */
2282 sctp_walk_params(param, peer_init, init_hdr.params) {
2283 result = sctp_verify_param(net, ep, asoc, param, cid,
2286 case SCTP_IERROR_ABORT:
2287 case SCTP_IERROR_NOMEM:
2289 case SCTP_IERROR_ERROR:
2291 case SCTP_IERROR_NO_ERROR:
2296 } /* for (loop through all parameters) */
2301 /* Unpack the parameters in an INIT packet into an association.
2302 * Returns 0 on failure, else success.
2303 * FIXME: This is an association method.
2305 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2306 const union sctp_addr *peer_addr,
2307 struct sctp_init_chunk *peer_init, gfp_t gfp)
2309 struct net *net = sock_net(asoc->base.sk);
2310 struct sctp_transport *transport;
2311 struct list_head *pos, *temp;
2312 union sctp_params param;
2313 union sctp_addr addr;
2318 /* We must include the address that the INIT packet came from.
2319 * This is the only address that matters for an INIT packet.
2320 * When processing a COOKIE ECHO, we retrieve the from address
2321 * of the INIT from the cookie.
2324 /* This implementation defaults to making the first transport
2325 * added as the primary transport. The source address seems to
2326 * be a a better choice than any of the embedded addresses.
2328 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2331 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2334 /* Process the initialization parameters. */
2335 sctp_walk_params(param, peer_init, init_hdr.params) {
2336 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2337 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2338 af = sctp_get_af_specific(param_type2af(param.p->type));
2339 af->from_addr_param(&addr, param.addr,
2340 chunk->sctp_hdr->source, 0);
2341 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2345 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2349 /* source address of chunk may not match any valid address */
2353 /* AUTH: After processing the parameters, make sure that we
2354 * have all the required info to potentially do authentications.
2356 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2357 !asoc->peer.peer_hmacs))
2358 asoc->peer.auth_capable = 0;
2360 /* In a non-backward compatible mode, if the peer claims
2361 * support for ADD-IP but not AUTH, the ADD-IP spec states
2362 * that we MUST ABORT the association. Section 6. The section
2363 * also give us an option to silently ignore the packet, which
2364 * is what we'll do here.
2366 if (!net->sctp.addip_noauth &&
2367 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2368 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2370 SCTP_PARAM_SET_PRIMARY);
2371 asoc->peer.asconf_capable = 0;
2375 /* Walk list of transports, removing transports in the UNKNOWN state. */
2376 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2377 transport = list_entry(pos, struct sctp_transport, transports);
2378 if (transport->state == SCTP_UNKNOWN) {
2379 sctp_assoc_rm_peer(asoc, transport);
2383 /* The fixed INIT headers are always in network byte
2386 asoc->peer.i.init_tag =
2387 ntohl(peer_init->init_hdr.init_tag);
2388 asoc->peer.i.a_rwnd =
2389 ntohl(peer_init->init_hdr.a_rwnd);
2390 asoc->peer.i.num_outbound_streams =
2391 ntohs(peer_init->init_hdr.num_outbound_streams);
2392 asoc->peer.i.num_inbound_streams =
2393 ntohs(peer_init->init_hdr.num_inbound_streams);
2394 asoc->peer.i.initial_tsn =
2395 ntohl(peer_init->init_hdr.initial_tsn);
2397 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2399 /* Apply the upper bounds for output streams based on peer's
2400 * number of inbound streams.
2402 if (asoc->c.sinit_num_ostreams >
2403 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2404 asoc->c.sinit_num_ostreams =
2405 ntohs(peer_init->init_hdr.num_inbound_streams);
2408 if (asoc->c.sinit_max_instreams >
2409 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2410 asoc->c.sinit_max_instreams =
2411 ntohs(peer_init->init_hdr.num_outbound_streams);
2414 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2415 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2417 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2418 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2420 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2421 cookie = asoc->peer.cookie;
2423 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
2424 if (!asoc->peer.cookie)
2428 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2429 * high (for example, implementations MAY use the size of the receiver
2430 * advertised window).
2432 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2434 transport->ssthresh = asoc->peer.i.a_rwnd;
2437 /* Set up the TSN tracking pieces. */
2438 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2439 asoc->peer.i.initial_tsn, gfp))
2442 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2444 * The stream sequence number in all the streams shall start
2445 * from 0 when the association is established. Also, when the
2446 * stream sequence number reaches the value 65535 the next
2447 * stream sequence number shall be set to 0.
2450 if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
2451 asoc->c.sinit_max_instreams, gfp))
2454 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2457 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2459 * When an endpoint has an ASCONF signaled change to be sent to the
2460 * remote endpoint it should do the following:
2462 * A2) A serial number should be assigned to the Chunk. The serial
2463 * number should be a monotonically increasing number. All serial
2464 * numbers are defined to be initialized at the start of the
2465 * association to the same value as the Initial TSN.
2467 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2471 /* Release the transport structures. */
2472 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2473 transport = list_entry(pos, struct sctp_transport, transports);
2474 if (transport->state != SCTP_ACTIVE)
2475 sctp_assoc_rm_peer(asoc, transport);
2483 /* Update asoc with the option described in param.
2485 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2487 * asoc is the association to update.
2488 * param is the variable length parameter to use for update.
2489 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2490 * If the current packet is an INIT we want to minimize the amount of
2491 * work we do. In particular, we should not build transport
2492 * structures for the addresses.
2494 static int sctp_process_param(struct sctp_association *asoc,
2495 union sctp_params param,
2496 const union sctp_addr *peer_addr,
2499 struct net *net = sock_net(asoc->base.sk);
2500 struct sctp_endpoint *ep = asoc->ep;
2501 union sctp_addr_param *addr_param;
2502 struct sctp_transport *t;
2503 enum sctp_scope scope;
2504 union sctp_addr addr;
2510 /* We maintain all INIT parameters in network byte order all the
2511 * time. This allows us to not worry about whether the parameters
2512 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2514 switch (param.p->type) {
2515 case SCTP_PARAM_IPV6_ADDRESS:
2516 if (PF_INET6 != asoc->base.sk->sk_family)
2520 case SCTP_PARAM_IPV4_ADDRESS:
2521 /* v4 addresses are not allowed on v6-only socket */
2522 if (ipv6_only_sock(asoc->base.sk))
2525 af = sctp_get_af_specific(param_type2af(param.p->type));
2526 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
2527 scope = sctp_scope(peer_addr);
2528 if (sctp_in_scope(net, &addr, scope))
2529 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2533 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2534 if (!net->sctp.cookie_preserve_enable)
2537 stale = ntohl(param.life->lifespan_increment);
2539 /* Suggested Cookie Life span increment's unit is msec,
2542 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2545 case SCTP_PARAM_HOST_NAME_ADDRESS:
2546 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2549 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2550 /* Turn off the default values first so we'll know which
2551 * ones are really set by the peer.
2553 asoc->peer.ipv4_address = 0;
2554 asoc->peer.ipv6_address = 0;
2556 /* Assume that peer supports the address family
2557 * by which it sends a packet.
2559 if (peer_addr->sa.sa_family == AF_INET6)
2560 asoc->peer.ipv6_address = 1;
2561 else if (peer_addr->sa.sa_family == AF_INET)
2562 asoc->peer.ipv4_address = 1;
2564 /* Cycle through address types; avoid divide by 0. */
2565 sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2567 sat /= sizeof(__u16);
2569 for (i = 0; i < sat; ++i) {
2570 switch (param.sat->types[i]) {
2571 case SCTP_PARAM_IPV4_ADDRESS:
2572 asoc->peer.ipv4_address = 1;
2575 case SCTP_PARAM_IPV6_ADDRESS:
2576 if (PF_INET6 == asoc->base.sk->sk_family)
2577 asoc->peer.ipv6_address = 1;
2580 case SCTP_PARAM_HOST_NAME_ADDRESS:
2581 asoc->peer.hostname_address = 1;
2584 default: /* Just ignore anything else. */
2590 case SCTP_PARAM_STATE_COOKIE:
2591 asoc->peer.cookie_len =
2592 ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2593 asoc->peer.cookie = param.cookie->body;
2596 case SCTP_PARAM_HEARTBEAT_INFO:
2597 /* Would be odd to receive, but it causes no problems. */
2600 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2601 /* Rejected during verify stage. */
2604 case SCTP_PARAM_ECN_CAPABLE:
2605 asoc->peer.ecn_capable = 1;
2608 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2609 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2612 case SCTP_PARAM_SET_PRIMARY:
2613 if (!net->sctp.addip_enable)
2616 addr_param = param.v + sizeof(struct sctp_addip_param);
2618 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2622 af->from_addr_param(&addr, addr_param,
2623 htons(asoc->peer.port), 0);
2625 /* if the address is invalid, we can't process it.
2626 * XXX: see spec for what to do.
2628 if (!af->addr_valid(&addr, NULL, NULL))
2631 t = sctp_assoc_lookup_paddr(asoc, &addr);
2635 sctp_assoc_set_primary(asoc, t);
2638 case SCTP_PARAM_SUPPORTED_EXT:
2639 sctp_process_ext_param(asoc, param);
2642 case SCTP_PARAM_FWD_TSN_SUPPORT:
2643 if (asoc->prsctp_enable) {
2644 asoc->peer.prsctp_capable = 1;
2650 case SCTP_PARAM_RANDOM:
2651 if (!ep->auth_enable)
2654 /* Save peer's random parameter */
2655 asoc->peer.peer_random = kmemdup(param.p,
2656 ntohs(param.p->length), gfp);
2657 if (!asoc->peer.peer_random) {
2663 case SCTP_PARAM_HMAC_ALGO:
2664 if (!ep->auth_enable)
2667 /* Save peer's HMAC list */
2668 asoc->peer.peer_hmacs = kmemdup(param.p,
2669 ntohs(param.p->length), gfp);
2670 if (!asoc->peer.peer_hmacs) {
2675 /* Set the default HMAC the peer requested*/
2676 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2679 case SCTP_PARAM_CHUNKS:
2680 if (!ep->auth_enable)
2683 asoc->peer.peer_chunks = kmemdup(param.p,
2684 ntohs(param.p->length), gfp);
2685 if (!asoc->peer.peer_chunks)
2690 /* Any unrecognized parameters should have been caught
2691 * and handled by sctp_verify_param() which should be
2692 * called prior to this routine. Simply log the error
2695 pr_debug("%s: ignoring param:%d for association:%p.\n",
2696 __func__, ntohs(param.p->type), asoc);
2703 /* Select a new verification tag. */
2704 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2706 /* I believe that this random number generator complies with RFC1750.
2707 * A tag of 0 is reserved for special cases (e.g. INIT).
2712 get_random_bytes(&x, sizeof(__u32));
2718 /* Select an initial TSN to send during startup. */
2719 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2723 get_random_bytes(&retval, sizeof(__u32));
2728 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2730 * 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
2731 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2732 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2733 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2735 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2736 * | Address Parameter |
2737 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2738 * | ASCONF Parameter #1 |
2739 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2743 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2744 * | ASCONF Parameter #N |
2745 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2747 * Address Parameter and other parameter will not be wrapped in this function
2749 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2750 union sctp_addr *addr,
2753 struct sctp_addiphdr asconf;
2754 struct sctp_chunk *retval;
2755 int length = sizeof(asconf) + vparam_len;
2756 union sctp_addr_param addrparam;
2758 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2760 addrlen = af->to_addr_param(addr, &addrparam);
2765 /* Create the chunk. */
2766 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2771 asconf.serial = htonl(asoc->addip_serial++);
2773 retval->subh.addip_hdr =
2774 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2775 retval->param_hdr.v =
2776 sctp_addto_chunk(retval, addrlen, &addrparam);
2782 * 3.2.1 Add IP Address
2784 * 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
2785 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2786 * | Type = 0xC001 | Length = Variable |
2787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2788 * | ASCONF-Request Correlation ID |
2789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2790 * | Address Parameter |
2791 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2793 * 3.2.2 Delete IP Address
2795 * 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
2796 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2797 * | Type = 0xC002 | Length = Variable |
2798 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2799 * | ASCONF-Request Correlation ID |
2800 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2801 * | Address Parameter |
2802 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2805 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2806 union sctp_addr *laddr,
2807 struct sockaddr *addrs,
2808 int addrcnt, __be16 flags)
2810 union sctp_addr_param addr_param;
2811 struct sctp_addip_param param;
2812 int paramlen = sizeof(param);
2813 struct sctp_chunk *retval;
2814 int addr_param_len = 0;
2815 union sctp_addr *addr;
2816 int totallen = 0, i;
2821 /* Get total length of all the address parameters. */
2823 for (i = 0; i < addrcnt; i++) {
2825 af = sctp_get_af_specific(addr->v4.sin_family);
2826 addr_param_len = af->to_addr_param(addr, &addr_param);
2828 totallen += paramlen;
2829 totallen += addr_param_len;
2831 addr_buf += af->sockaddr_len;
2832 if (asoc->asconf_addr_del_pending && !del_pickup) {
2833 /* reuse the parameter length from the same scope one */
2834 totallen += paramlen;
2835 totallen += addr_param_len;
2838 pr_debug("%s: picked same-scope del_pending addr, "
2839 "totallen for all addresses is %d\n",
2840 __func__, totallen);
2844 /* Create an asconf chunk with the required length. */
2845 retval = sctp_make_asconf(asoc, laddr, totallen);
2849 /* Add the address parameters to the asconf chunk. */
2851 for (i = 0; i < addrcnt; i++) {
2853 af = sctp_get_af_specific(addr->v4.sin_family);
2854 addr_param_len = af->to_addr_param(addr, &addr_param);
2855 param.param_hdr.type = flags;
2856 param.param_hdr.length = htons(paramlen + addr_param_len);
2859 sctp_addto_chunk(retval, paramlen, ¶m);
2860 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2862 addr_buf += af->sockaddr_len;
2864 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2865 addr = asoc->asconf_addr_del_pending;
2866 af = sctp_get_af_specific(addr->v4.sin_family);
2867 addr_param_len = af->to_addr_param(addr, &addr_param);
2868 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2869 param.param_hdr.length = htons(paramlen + addr_param_len);
2872 sctp_addto_chunk(retval, paramlen, ¶m);
2873 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2879 * 3.2.4 Set Primary IP Address
2881 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2882 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2883 * | Type =0xC004 | Length = Variable |
2884 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2885 * | ASCONF-Request Correlation ID |
2886 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2887 * | Address Parameter |
2888 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2890 * Create an ASCONF chunk with Set Primary IP address parameter.
2892 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2893 union sctp_addr *addr)
2895 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2896 union sctp_addr_param addrparam;
2897 struct sctp_addip_param param;
2898 struct sctp_chunk *retval;
2899 int len = sizeof(param);
2902 addrlen = af->to_addr_param(addr, &addrparam);
2907 /* Create the chunk and make asconf header. */
2908 retval = sctp_make_asconf(asoc, addr, len);
2912 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2913 param.param_hdr.length = htons(len);
2916 sctp_addto_chunk(retval, sizeof(param), ¶m);
2917 sctp_addto_chunk(retval, addrlen, &addrparam);
2922 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2924 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2925 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2926 * | Type = 0x80 | Chunk Flags | Chunk Length |
2927 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2929 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2930 * | ASCONF Parameter Response#1 |
2931 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2935 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2936 * | ASCONF Parameter Response#N |
2937 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2939 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2941 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2942 __u32 serial, int vparam_len)
2944 struct sctp_addiphdr asconf;
2945 struct sctp_chunk *retval;
2946 int length = sizeof(asconf) + vparam_len;
2948 /* Create the chunk. */
2949 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2954 asconf.serial = htonl(serial);
2956 retval->subh.addip_hdr =
2957 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2962 /* Add response parameters to an ASCONF_ACK chunk. */
2963 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2965 struct sctp_addip_param *asconf_param)
2967 struct sctp_addip_param ack_param;
2968 struct sctp_errhdr err_param;
2969 int asconf_param_len = 0;
2970 int err_param_len = 0;
2971 __be16 response_type;
2973 if (SCTP_ERROR_NO_ERROR == err_code) {
2974 response_type = SCTP_PARAM_SUCCESS_REPORT;
2976 response_type = SCTP_PARAM_ERR_CAUSE;
2977 err_param_len = sizeof(err_param);
2980 ntohs(asconf_param->param_hdr.length);
2983 /* Add Success Indication or Error Cause Indication parameter. */
2984 ack_param.param_hdr.type = response_type;
2985 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2988 ack_param.crr_id = crr_id;
2989 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2991 if (SCTP_ERROR_NO_ERROR == err_code)
2994 /* Add Error Cause parameter. */
2995 err_param.cause = err_code;
2996 err_param.length = htons(err_param_len + asconf_param_len);
2997 sctp_addto_chunk(chunk, err_param_len, &err_param);
2999 /* Add the failed TLV copied from ASCONF chunk. */
3001 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3004 /* Process a asconf parameter. */
3005 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3006 struct sctp_chunk *asconf,
3007 struct sctp_addip_param *asconf_param)
3009 union sctp_addr_param *addr_param;
3010 struct sctp_transport *peer;
3011 union sctp_addr addr;
3014 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3016 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3017 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3018 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3019 return SCTP_ERROR_UNKNOWN_PARAM;
3021 switch (addr_param->p.type) {
3022 case SCTP_PARAM_IPV6_ADDRESS:
3023 if (!asoc->peer.ipv6_address)
3024 return SCTP_ERROR_DNS_FAILED;
3026 case SCTP_PARAM_IPV4_ADDRESS:
3027 if (!asoc->peer.ipv4_address)
3028 return SCTP_ERROR_DNS_FAILED;
3031 return SCTP_ERROR_DNS_FAILED;
3034 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3036 return SCTP_ERROR_DNS_FAILED;
3038 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
3040 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3041 * or multicast address.
3042 * (note: wildcard is permitted and requires special handling so
3043 * make sure we check for that)
3045 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3046 return SCTP_ERROR_DNS_FAILED;
3048 switch (asconf_param->param_hdr.type) {
3049 case SCTP_PARAM_ADD_IP:
3051 * If the address 0.0.0.0 or ::0 is provided, the source
3052 * address of the packet MUST be added.
3054 if (af->is_any(&addr))
3055 memcpy(&addr, &asconf->source, sizeof(addr));
3057 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3058 * request and does not have the local resources to add this
3059 * new address to the association, it MUST return an Error
3060 * Cause TLV set to the new error code 'Operation Refused
3061 * Due to Resource Shortage'.
3064 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3066 return SCTP_ERROR_RSRC_LOW;
3068 /* Start the heartbeat timer. */
3069 sctp_transport_reset_hb_timer(peer);
3070 asoc->new_transport = peer;
3072 case SCTP_PARAM_DEL_IP:
3073 /* ADDIP 4.3 D7) If a request is received to delete the
3074 * last remaining IP address of a peer endpoint, the receiver
3075 * MUST send an Error Cause TLV with the error cause set to the
3076 * new error code 'Request to Delete Last Remaining IP Address'.
3078 if (asoc->peer.transport_count == 1)
3079 return SCTP_ERROR_DEL_LAST_IP;
3081 /* ADDIP 4.3 D8) If a request is received to delete an IP
3082 * address which is also the source address of the IP packet
3083 * which contained the ASCONF chunk, the receiver MUST reject
3084 * this request. To reject the request the receiver MUST send
3085 * an Error Cause TLV set to the new error code 'Request to
3086 * Delete Source IP Address'
3088 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3089 return SCTP_ERROR_DEL_SRC_IP;
3092 * If the address 0.0.0.0 or ::0 is provided, all
3093 * addresses of the peer except the source address of the
3094 * packet MUST be deleted.
3096 if (af->is_any(&addr)) {
3097 sctp_assoc_set_primary(asoc, asconf->transport);
3098 sctp_assoc_del_nonprimary_peers(asoc,
3100 return SCTP_ERROR_NO_ERROR;
3103 /* If the address is not part of the association, the
3104 * ASCONF-ACK with Error Cause Indication Parameter
3105 * which including cause of Unresolvable Address should
3108 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3110 return SCTP_ERROR_DNS_FAILED;
3112 sctp_assoc_rm_peer(asoc, peer);
3114 case SCTP_PARAM_SET_PRIMARY:
3115 /* ADDIP Section 4.2.4
3116 * If the address 0.0.0.0 or ::0 is provided, the receiver
3117 * MAY mark the source address of the packet as its
3120 if (af->is_any(&addr))
3121 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3123 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3125 return SCTP_ERROR_DNS_FAILED;
3127 sctp_assoc_set_primary(asoc, peer);
3131 return SCTP_ERROR_NO_ERROR;
3134 /* Verify the ASCONF packet before we process it. */
3135 bool sctp_verify_asconf(const struct sctp_association *asoc,
3136 struct sctp_chunk *chunk, bool addr_param_needed,
3137 struct sctp_paramhdr **errp)
3139 struct sctp_addip_chunk *addip;
3140 bool addr_param_seen = false;
3141 union sctp_params param;
3143 addip = (struct sctp_addip_chunk *)chunk->chunk_hdr;
3144 sctp_walk_params(param, addip, addip_hdr.params) {
3145 size_t length = ntohs(param.p->length);
3148 switch (param.p->type) {
3149 case SCTP_PARAM_ERR_CAUSE:
3151 case SCTP_PARAM_IPV4_ADDRESS:
3152 if (length != sizeof(struct sctp_ipv4addr_param))
3154 /* ensure there is only one addr param and it's in the
3155 * beginning of addip_hdr params, or we reject it.
3157 if (param.v != addip->addip_hdr.params)
3159 addr_param_seen = true;
3161 case SCTP_PARAM_IPV6_ADDRESS:
3162 if (length != sizeof(struct sctp_ipv6addr_param))
3164 if (param.v != addip->addip_hdr.params)
3166 addr_param_seen = true;
3168 case SCTP_PARAM_ADD_IP:
3169 case SCTP_PARAM_DEL_IP:
3170 case SCTP_PARAM_SET_PRIMARY:
3171 /* In ASCONF chunks, these need to be first. */
3172 if (addr_param_needed && !addr_param_seen)
3174 length = ntohs(param.addip->param_hdr.length);
3175 if (length < sizeof(struct sctp_addip_param) +
3179 case SCTP_PARAM_SUCCESS_REPORT:
3180 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3181 if (length != sizeof(struct sctp_addip_param))
3185 /* This is unkown to us, reject! */
3190 /* Remaining sanity checks. */
3191 if (addr_param_needed && !addr_param_seen)
3193 if (!addr_param_needed && addr_param_seen)
3195 if (param.v != chunk->chunk_end)
3201 /* Process an incoming ASCONF chunk with the next expected serial no. and
3202 * return an ASCONF_ACK chunk to be sent in response.
3204 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3205 struct sctp_chunk *asconf)
3207 union sctp_addr_param *addr_param;
3208 struct sctp_addip_chunk *addip;
3209 struct sctp_chunk *asconf_ack;
3210 bool all_param_pass = true;
3211 struct sctp_addiphdr *hdr;
3212 int length = 0, chunk_len;
3213 union sctp_params param;
3217 addip = (struct sctp_addip_chunk *)asconf->chunk_hdr;
3218 chunk_len = ntohs(asconf->chunk_hdr->length) -
3219 sizeof(struct sctp_chunkhdr);
3220 hdr = (struct sctp_addiphdr *)asconf->skb->data;
3221 serial = ntohl(hdr->serial);
3223 /* Skip the addiphdr and store a pointer to address parameter. */
3224 length = sizeof(*hdr);
3225 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3226 chunk_len -= length;
3228 /* Skip the address parameter and store a pointer to the first
3231 length = ntohs(addr_param->p.length);
3232 chunk_len -= length;
3234 /* create an ASCONF_ACK chunk.
3235 * Based on the definitions of parameters, we know that the size of
3236 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3239 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3243 /* Process the TLVs contained within the ASCONF chunk. */
3244 sctp_walk_params(param, addip, addip_hdr.params) {
3245 /* Skip preceeding address parameters. */
3246 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3247 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3250 err_code = sctp_process_asconf_param(asoc, asconf,
3253 * If an error response is received for a TLV parameter,
3254 * all TLVs with no response before the failed TLV are
3255 * considered successful if not reported. All TLVs after
3256 * the failed response are considered unsuccessful unless
3257 * a specific success indication is present for the parameter.
3259 if (err_code != SCTP_ERROR_NO_ERROR)
3260 all_param_pass = false;
3261 if (!all_param_pass)
3262 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3263 err_code, param.addip);
3265 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3266 * an IP address sends an 'Out of Resource' in its response, it
3267 * MUST also fail any subsequent add or delete requests bundled
3270 if (err_code == SCTP_ERROR_RSRC_LOW)
3274 asoc->peer.addip_serial++;
3276 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3277 * after freeing the reference to old asconf ack if any.
3280 sctp_chunk_hold(asconf_ack);
3281 list_add_tail(&asconf_ack->transmitted_list,
3282 &asoc->asconf_ack_list);
3288 /* Process a asconf parameter that is successfully acked. */
3289 static void sctp_asconf_param_success(struct sctp_association *asoc,
3290 struct sctp_addip_param *asconf_param)
3292 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3293 union sctp_addr_param *addr_param;
3294 struct sctp_sockaddr_entry *saddr;
3295 struct sctp_transport *transport;
3296 union sctp_addr addr;
3299 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3301 /* We have checked the packet before, so we do not check again. */
3302 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3303 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
3305 switch (asconf_param->param_hdr.type) {
3306 case SCTP_PARAM_ADD_IP:
3307 /* This is always done in BH context with a socket lock
3308 * held, so the list can not change.
3311 list_for_each_entry(saddr, &bp->address_list, list) {
3312 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3313 saddr->state = SCTP_ADDR_SRC;
3316 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3318 sctp_transport_dst_release(transport);
3321 case SCTP_PARAM_DEL_IP:
3323 sctp_del_bind_addr(bp, &addr);
3324 if (asoc->asconf_addr_del_pending != NULL &&
3325 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3326 kfree(asoc->asconf_addr_del_pending);
3327 asoc->asconf_addr_del_pending = NULL;
3330 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3332 sctp_transport_dst_release(transport);
3340 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3341 * for the given asconf parameter. If there is no response for this parameter,
3342 * return the error code based on the third argument 'no_err'.
3344 * A7) If an error response is received for a TLV parameter, all TLVs with no
3345 * response before the failed TLV are considered successful if not reported.
3346 * All TLVs after the failed response are considered unsuccessful unless a
3347 * specific success indication is present for the parameter.
3349 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3350 struct sctp_addip_param *asconf_param,
3353 struct sctp_addip_param *asconf_ack_param;
3354 struct sctp_errhdr *err_param;
3360 err_code = SCTP_ERROR_NO_ERROR;
3362 err_code = SCTP_ERROR_REQ_REFUSED;
3364 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3365 sizeof(struct sctp_chunkhdr);
3367 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3368 * the first asconf_ack parameter.
3370 length = sizeof(struct sctp_addiphdr);
3371 asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data +
3373 asconf_ack_len -= length;
3375 while (asconf_ack_len > 0) {
3376 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3377 switch (asconf_ack_param->param_hdr.type) {
3378 case SCTP_PARAM_SUCCESS_REPORT:
3379 return SCTP_ERROR_NO_ERROR;
3380 case SCTP_PARAM_ERR_CAUSE:
3381 length = sizeof(*asconf_ack_param);
3382 err_param = (void *)asconf_ack_param + length;
3383 asconf_ack_len -= length;
3384 if (asconf_ack_len > 0)
3385 return err_param->cause;
3387 return SCTP_ERROR_INV_PARAM;
3390 return SCTP_ERROR_INV_PARAM;
3394 length = ntohs(asconf_ack_param->param_hdr.length);
3395 asconf_ack_param = (void *)asconf_ack_param + length;
3396 asconf_ack_len -= length;
3402 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3403 int sctp_process_asconf_ack(struct sctp_association *asoc,
3404 struct sctp_chunk *asconf_ack)
3406 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3407 struct sctp_addip_param *asconf_param;
3408 __be16 err_code = SCTP_ERROR_NO_ERROR;
3409 union sctp_addr_param *addr_param;
3410 int asconf_len = asconf->skb->len;
3411 int all_param_pass = 0;
3416 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3417 * a pointer to address parameter.
3419 length = sizeof(struct sctp_addip_chunk);
3420 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3421 asconf_len -= length;
3423 /* Skip the address parameter in the last asconf sent and store a
3424 * pointer to the first asconf parameter.
3426 length = ntohs(addr_param->p.length);
3427 asconf_param = (void *)addr_param + length;
3428 asconf_len -= length;
3431 * A8) If there is no response(s) to specific TLV parameter(s), and no
3432 * failures are indicated, then all request(s) are considered
3435 if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr))
3438 /* Process the TLVs contained in the last sent ASCONF chunk. */
3439 while (asconf_len > 0) {
3441 err_code = SCTP_ERROR_NO_ERROR;
3443 err_code = sctp_get_asconf_response(asconf_ack,
3446 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3451 case SCTP_ERROR_NO_ERROR:
3452 sctp_asconf_param_success(asoc, asconf_param);
3455 case SCTP_ERROR_RSRC_LOW:
3459 case SCTP_ERROR_UNKNOWN_PARAM:
3460 /* Disable sending this type of asconf parameter in
3463 asoc->peer.addip_disabled_mask |=
3464 asconf_param->param_hdr.type;
3467 case SCTP_ERROR_REQ_REFUSED:
3468 case SCTP_ERROR_DEL_LAST_IP:
3469 case SCTP_ERROR_DEL_SRC_IP:
3474 /* Skip the processed asconf parameter and move to the next
3477 length = ntohs(asconf_param->param_hdr.length);
3478 asconf_param = (void *)asconf_param + length;
3479 asconf_len -= length;
3482 if (no_err && asoc->src_out_of_asoc_ok) {
3483 asoc->src_out_of_asoc_ok = 0;
3484 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3487 /* Free the cached last sent asconf chunk. */
3488 list_del_init(&asconf->transmitted_list);
3489 sctp_chunk_free(asconf);
3490 asoc->addip_last_asconf = NULL;
3495 /* Make a FWD TSN chunk. */
3496 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3497 __u32 new_cum_tsn, size_t nstreams,
3498 struct sctp_fwdtsn_skip *skiplist)
3500 struct sctp_chunk *retval = NULL;
3501 struct sctp_fwdtsn_hdr ftsn_hdr;
3502 struct sctp_fwdtsn_skip skip;
3506 hint = (nstreams + 1) * sizeof(__u32);
3508 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3513 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3514 retval->subh.fwdtsn_hdr =
3515 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3517 for (i = 0; i < nstreams; i++) {
3518 skip.stream = skiplist[i].stream;
3519 skip.ssn = skiplist[i].ssn;
3520 sctp_addto_chunk(retval, sizeof(skip), &skip);
3526 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3528 * 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
3529 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3530 * | Type = 130 | Chunk Flags | Chunk Length |
3531 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3533 * / Re-configuration Parameter /
3535 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3537 * / Re-configuration Parameter (optional) /
3539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3541 static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc,
3544 struct sctp_reconf_chunk *reconf;
3545 struct sctp_chunk *retval;
3547 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3552 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3553 retval->param_hdr.v = reconf->params;
3558 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3560 * 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
3561 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3562 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3563 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3564 * | Re-configuration Request Sequence Number |
3565 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3566 * | Re-configuration Response Sequence Number |
3567 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3568 * | Sender's Last Assigned TSN |
3569 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3570 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3571 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3573 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3574 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3575 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3577 * RE-CONFIG 4.2 (STREAM IN RESET)
3579 * 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
3580 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3581 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3582 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3583 * | Re-configuration Request Sequence Number |
3584 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3585 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3586 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3588 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3589 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3590 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3592 struct sctp_chunk *sctp_make_strreset_req(
3593 const struct sctp_association *asoc,
3594 __u16 stream_num, __u16 *stream_list,
3597 struct sctp_strreset_outreq outreq;
3598 __u16 stream_len = stream_num * 2;
3599 struct sctp_strreset_inreq inreq;
3600 struct sctp_chunk *retval;
3601 __u16 outlen, inlen;
3603 outlen = (sizeof(outreq) + stream_len) * out;
3604 inlen = (sizeof(inreq) + stream_len) * in;
3606 retval = sctp_make_reconf(asoc, outlen + inlen);
3611 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3612 outreq.param_hdr.length = htons(outlen);
3613 outreq.request_seq = htonl(asoc->strreset_outseq);
3614 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3615 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3617 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3620 sctp_addto_chunk(retval, stream_len, stream_list);
3624 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3625 inreq.param_hdr.length = htons(inlen);
3626 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3628 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3631 sctp_addto_chunk(retval, stream_len, stream_list);
3637 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3639 * 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
3640 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3641 * | Parameter Type = 15 | Parameter Length = 8 |
3642 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3643 * | Re-configuration Request Sequence Number |
3644 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3646 struct sctp_chunk *sctp_make_strreset_tsnreq(
3647 const struct sctp_association *asoc)
3649 struct sctp_strreset_tsnreq tsnreq;
3650 __u16 length = sizeof(tsnreq);
3651 struct sctp_chunk *retval;
3653 retval = sctp_make_reconf(asoc, length);
3657 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3658 tsnreq.param_hdr.length = htons(length);
3659 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3661 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3666 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3668 * 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
3669 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3670 * | Parameter Type = 17 | Parameter Length = 12 |
3671 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3672 * | Re-configuration Request Sequence Number |
3673 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3674 * | Number of new streams | Reserved |
3675 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3677 struct sctp_chunk *sctp_make_strreset_addstrm(
3678 const struct sctp_association *asoc,
3679 __u16 out, __u16 in)
3681 struct sctp_strreset_addstrm addstrm;
3682 __u16 size = sizeof(addstrm);
3683 struct sctp_chunk *retval;
3685 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3690 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3691 addstrm.param_hdr.length = htons(size);
3692 addstrm.number_of_streams = htons(out);
3693 addstrm.request_seq = htonl(asoc->strreset_outseq);
3694 addstrm.reserved = 0;
3696 sctp_addto_chunk(retval, size, &addstrm);
3700 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3701 addstrm.param_hdr.length = htons(size);
3702 addstrm.number_of_streams = htons(in);
3703 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3704 addstrm.reserved = 0;
3706 sctp_addto_chunk(retval, size, &addstrm);
3712 /* RE-CONFIG 4.4 (RESP)
3714 * 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
3715 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3716 * | Parameter Type = 16 | Parameter Length |
3717 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3718 * | Re-configuration Response Sequence Number |
3719 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3721 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3723 struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
3724 __u32 result, __u32 sn)
3726 struct sctp_strreset_resp resp;
3727 __u16 length = sizeof(resp);
3728 struct sctp_chunk *retval;
3730 retval = sctp_make_reconf(asoc, length);
3734 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3735 resp.param_hdr.length = htons(length);
3736 resp.response_seq = htonl(sn);
3737 resp.result = htonl(result);
3739 sctp_addto_chunk(retval, sizeof(resp), &resp);
3744 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3746 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
3747 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3748 * | Parameter Type = 16 | Parameter Length |
3749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3750 * | Re-configuration Response Sequence Number |
3751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3754 * | Sender's Next TSN (optional) |
3755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3756 * | Receiver's Next TSN (optional) |
3757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3759 struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
3760 __u32 result, __u32 sn,
3764 struct sctp_strreset_resptsn tsnresp;
3765 __u16 length = sizeof(tsnresp);
3766 struct sctp_chunk *retval;
3768 retval = sctp_make_reconf(asoc, length);
3772 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3773 tsnresp.param_hdr.length = htons(length);
3775 tsnresp.response_seq = htonl(sn);
3776 tsnresp.result = htonl(result);
3777 tsnresp.senders_next_tsn = htonl(sender_tsn);
3778 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3780 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3785 bool sctp_verify_reconf(const struct sctp_association *asoc,
3786 struct sctp_chunk *chunk,
3787 struct sctp_paramhdr **errp)
3789 struct sctp_reconf_chunk *hdr;
3790 union sctp_params param;
3791 __u16 last = 0, cnt = 0;
3793 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3794 sctp_walk_params(param, hdr, params) {
3795 __u16 length = ntohs(param.p->length);
3800 switch (param.p->type) {
3801 case SCTP_PARAM_RESET_OUT_REQUEST:
3802 if (length < sizeof(struct sctp_strreset_outreq) ||
3803 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3804 last != SCTP_PARAM_RESET_IN_REQUEST))
3807 case SCTP_PARAM_RESET_IN_REQUEST:
3808 if (length < sizeof(struct sctp_strreset_inreq) ||
3809 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3812 case SCTP_PARAM_RESET_RESPONSE:
3813 if ((length != sizeof(struct sctp_strreset_resp) &&
3814 length != sizeof(struct sctp_strreset_resptsn)) ||
3815 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3816 last != SCTP_PARAM_RESET_OUT_REQUEST))
3819 case SCTP_PARAM_RESET_TSN_REQUEST:
3821 sizeof(struct sctp_strreset_tsnreq) || last)
3824 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3825 if (length != sizeof(struct sctp_strreset_addstrm) ||
3826 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3829 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3830 if (length != sizeof(struct sctp_strreset_addstrm) ||
3831 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3838 last = param.p->type;