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,
85 /* Control chunk destructor */
86 static void sctp_control_release_owner(struct sk_buff *skb)
88 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
91 struct sctp_shared_key *shkey = chunk->shkey;
92 struct sctp_association *asoc = chunk->asoc;
94 /* refcnt == 2 and !list_empty mean after this release, it's
95 * not being used anywhere, and it's time to notify userland
96 * that this shkey can be freed if it's been deactivated.
98 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
99 refcount_read(&shkey->refcnt) == 2) {
100 struct sctp_ulpevent *ev;
102 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
106 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
108 sctp_auth_shkey_release(chunk->shkey);
112 static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
114 struct sctp_association *asoc = chunk->asoc;
115 struct sk_buff *skb = chunk->skb;
117 /* TODO: properly account for control chunks.
118 * To do it right we'll need:
119 * 1) endpoint if association isn't known.
120 * 2) proper memory accounting.
122 * For now don't do anything for now.
125 chunk->shkey = asoc->shkey;
126 sctp_auth_shkey_hold(chunk->shkey);
128 skb->sk = asoc ? asoc->base.sk : NULL;
129 skb_shinfo(skb)->destructor_arg = chunk;
130 skb->destructor = sctp_control_release_owner;
133 /* What was the inbound interface for this chunk? */
134 int sctp_chunk_iif(const struct sctp_chunk *chunk)
136 struct sk_buff *skb = chunk->skb;
138 return SCTP_INPUT_CB(skb)->af->skb_iif(skb);
141 /* RFC 2960 3.3.2 Initiation (INIT) (1)
143 * Note 2: The ECN capable field is reserved for future use of
144 * Explicit Congestion Notification.
146 static const struct sctp_paramhdr ecap_param = {
147 SCTP_PARAM_ECN_CAPABLE,
148 cpu_to_be16(sizeof(struct sctp_paramhdr)),
150 static const struct sctp_paramhdr prsctp_param = {
151 SCTP_PARAM_FWD_TSN_SUPPORT,
152 cpu_to_be16(sizeof(struct sctp_paramhdr)),
155 /* A helper to initialize an op error inside a provided chunk, as most
156 * cause codes will be embedded inside an abort chunk.
158 int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
161 struct sctp_errhdr err;
164 /* Cause code constants are now defined in network order. */
165 err.cause = cause_code;
166 len = sizeof(err) + paylen;
167 err.length = htons(len);
169 if (skb_tailroom(chunk->skb) < len)
172 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err);
177 /* 3.3.2 Initiation (INIT) (1)
179 * This chunk is used to initiate a SCTP association between two
180 * endpoints. The format of the INIT chunk is shown below:
183 * 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
184 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
185 * | Type = 1 | Chunk Flags | Chunk Length |
186 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
188 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
189 * | Advertised Receiver Window Credit (a_rwnd) |
190 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
191 * | Number of Outbound Streams | Number of Inbound Streams |
192 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
194 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
196 * / Optional/Variable-Length Parameters /
198 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
201 * The INIT chunk contains the following parameters. Unless otherwise
202 * noted, each parameter MUST only be included once in the INIT chunk.
204 * Fixed Parameters Status
205 * ----------------------------------------------
206 * Initiate Tag Mandatory
207 * Advertised Receiver Window Credit Mandatory
208 * Number of Outbound Streams Mandatory
209 * Number of Inbound Streams Mandatory
210 * Initial TSN Mandatory
212 * Variable Parameters Status Type Value
213 * -------------------------------------------------------------
214 * IPv4 Address (Note 1) Optional 5
215 * IPv6 Address (Note 1) Optional 6
216 * Cookie Preservative Optional 9
217 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
218 * Host Name Address (Note 3) Optional 11
219 * Supported Address Types (Note 4) Optional 12
221 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
222 const struct sctp_bind_addr *bp,
223 gfp_t gfp, int vparam_len)
225 struct net *net = sock_net(asoc->base.sk);
226 struct sctp_supported_ext_param ext_param;
227 struct sctp_adaptation_ind_param aiparam;
228 struct sctp_paramhdr *auth_chunks = NULL;
229 struct sctp_paramhdr *auth_hmacs = NULL;
230 struct sctp_supported_addrs_param sat;
231 struct sctp_endpoint *ep = asoc->ep;
232 struct sctp_chunk *retval = NULL;
233 int num_types, addrs_len = 0;
234 struct sctp_inithdr init;
235 union sctp_params addrs;
236 struct sctp_sock *sp;
242 /* RFC 2960 3.3.2 Initiation (INIT) (1)
244 * Note 1: The INIT chunks can contain multiple addresses that
245 * can be IPv4 and/or IPv6 in any combination.
248 /* Convert the provided bind address list to raw format. */
249 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
251 init.init_tag = htonl(asoc->c.my_vtag);
252 init.a_rwnd = htonl(asoc->rwnd);
253 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
254 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
255 init.initial_tsn = htonl(asoc->c.initial_tsn);
257 /* How many address types are needed? */
258 sp = sctp_sk(asoc->base.sk);
259 num_types = sp->pf->supported_addrs(sp, types);
261 chunksize = sizeof(init) + addrs_len;
262 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
263 chunksize += sizeof(ecap_param);
265 if (asoc->prsctp_enable)
266 chunksize += sizeof(prsctp_param);
268 /* ADDIP: Section 4.2.7:
269 * An implementation supporting this extension [ADDIP] MUST list
270 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
271 * INIT-ACK parameters.
273 if (net->sctp.addip_enable) {
274 extensions[num_ext] = SCTP_CID_ASCONF;
275 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
279 if (asoc->reconf_enable) {
280 extensions[num_ext] = SCTP_CID_RECONF;
284 if (sp->adaptation_ind)
285 chunksize += sizeof(aiparam);
287 if (sp->strm_interleave) {
288 extensions[num_ext] = SCTP_CID_I_DATA;
292 chunksize += vparam_len;
294 /* Account for AUTH related parameters */
295 if (ep->auth_enable) {
296 /* Add random parameter length*/
297 chunksize += sizeof(asoc->c.auth_random);
299 /* Add HMACS parameter length if any were defined */
300 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
301 if (auth_hmacs->length)
302 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
306 /* Add CHUNKS parameter length */
307 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
308 if (auth_chunks->length)
309 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
313 extensions[num_ext] = SCTP_CID_AUTH;
317 /* If we have any extensions to report, account for that */
319 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
321 /* RFC 2960 3.3.2 Initiation (INIT) (1)
323 * Note 3: An INIT chunk MUST NOT contain more than one Host
324 * Name address parameter. Moreover, the sender of the INIT
325 * MUST NOT combine any other address types with the Host Name
326 * address in the INIT. The receiver of INIT MUST ignore any
327 * other address types if the Host Name address parameter is
328 * present in the received INIT chunk.
330 * PLEASE DO NOT FIXME [This version does not support Host Name.]
333 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
337 retval->subh.init_hdr =
338 sctp_addto_chunk(retval, sizeof(init), &init);
339 retval->param_hdr.v =
340 sctp_addto_chunk(retval, addrs_len, addrs.v);
342 /* RFC 2960 3.3.2 Initiation (INIT) (1)
344 * Note 4: This parameter, when present, specifies all the
345 * address types the sending endpoint can support. The absence
346 * of this parameter indicates that the sending endpoint can
347 * support any address type.
349 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
350 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
351 sctp_addto_chunk(retval, sizeof(sat), &sat);
352 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
354 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
356 /* Add the supported extensions parameter. Be nice and add this
357 * fist before addiding the parameters for the extensions themselves
360 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
361 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
362 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
363 sctp_addto_param(retval, num_ext, extensions);
366 if (asoc->prsctp_enable)
367 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
369 if (sp->adaptation_ind) {
370 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
371 aiparam.param_hdr.length = htons(sizeof(aiparam));
372 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
373 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
376 /* Add SCTP-AUTH chunks to the parameter list */
377 if (ep->auth_enable) {
378 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
379 asoc->c.auth_random);
381 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
384 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
392 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
393 const struct sctp_chunk *chunk,
394 gfp_t gfp, int unkparam_len)
396 struct sctp_supported_ext_param ext_param;
397 struct sctp_adaptation_ind_param aiparam;
398 struct sctp_paramhdr *auth_chunks = NULL;
399 struct sctp_paramhdr *auth_random = NULL;
400 struct sctp_paramhdr *auth_hmacs = NULL;
401 struct sctp_chunk *retval = NULL;
402 struct sctp_cookie_param *cookie;
403 struct sctp_inithdr initack;
404 union sctp_params addrs;
405 struct sctp_sock *sp;
412 /* Note: there may be no addresses to embed. */
413 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
415 initack.init_tag = htonl(asoc->c.my_vtag);
416 initack.a_rwnd = htonl(asoc->rwnd);
417 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
418 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
419 initack.initial_tsn = htonl(asoc->c.initial_tsn);
421 /* FIXME: We really ought to build the cookie right
422 * into the packet instead of allocating more fresh memory.
424 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
429 /* Calculate the total size of allocation, include the reserved
430 * space for reporting unknown parameters if it is specified.
432 sp = sctp_sk(asoc->base.sk);
433 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
435 /* Tell peer that we'll do ECN only if peer advertised such cap. */
436 if (asoc->peer.ecn_capable)
437 chunksize += sizeof(ecap_param);
439 if (asoc->peer.prsctp_capable)
440 chunksize += sizeof(prsctp_param);
442 if (asoc->peer.asconf_capable) {
443 extensions[num_ext] = SCTP_CID_ASCONF;
444 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
448 if (asoc->peer.reconf_capable) {
449 extensions[num_ext] = SCTP_CID_RECONF;
453 if (sp->adaptation_ind)
454 chunksize += sizeof(aiparam);
456 if (asoc->intl_enable) {
457 extensions[num_ext] = SCTP_CID_I_DATA;
461 if (asoc->peer.auth_capable) {
462 auth_random = (struct sctp_paramhdr *)asoc->c.auth_random;
463 chunksize += ntohs(auth_random->length);
465 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
466 if (auth_hmacs->length)
467 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
471 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
472 if (auth_chunks->length)
473 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
477 extensions[num_ext] = SCTP_CID_AUTH;
482 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
484 /* Now allocate and fill out the chunk. */
485 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
489 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
491 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
492 * HEARTBEAT ACK, * etc.) to the same destination transport
493 * address from which it received the DATA or control chunk
494 * to which it is replying.
496 * [INIT ACK back to where the INIT came from.]
498 if (chunk->transport)
500 sctp_assoc_lookup_paddr(asoc,
501 &chunk->transport->ipaddr);
503 retval->subh.init_hdr =
504 sctp_addto_chunk(retval, sizeof(initack), &initack);
505 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
506 sctp_addto_chunk(retval, cookie_len, cookie);
507 if (asoc->peer.ecn_capable)
508 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
510 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
511 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
512 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
513 sctp_addto_param(retval, num_ext, extensions);
515 if (asoc->peer.prsctp_capable)
516 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
518 if (sp->adaptation_ind) {
519 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
520 aiparam.param_hdr.length = htons(sizeof(aiparam));
521 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
522 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
525 if (asoc->peer.auth_capable) {
526 sctp_addto_chunk(retval, ntohs(auth_random->length),
529 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
532 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
536 /* We need to remove the const qualifier at this point. */
537 retval->asoc = (struct sctp_association *) asoc;
546 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
548 * This chunk is used only during the initialization of an association.
549 * It is sent by the initiator of an association to its peer to complete
550 * the initialization process. This chunk MUST precede any DATA chunk
551 * sent within the association, but MAY be bundled with one or more DATA
552 * chunks in the same packet.
555 * 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
556 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
557 * | Type = 10 |Chunk Flags | Length |
558 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
561 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
565 * Set to zero on transmit and ignored on receipt.
567 * Length: 16 bits (unsigned integer)
569 * Set to the size of the chunk in bytes, including the 4 bytes of
570 * the chunk header and the size of the Cookie.
572 * Cookie: variable size
574 * This field must contain the exact cookie received in the
575 * State Cookie parameter from the previous INIT ACK.
577 * An implementation SHOULD make the cookie as small as possible
578 * to insure interoperability.
580 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
581 const struct sctp_chunk *chunk)
583 struct sctp_chunk *retval;
587 cookie = asoc->peer.cookie;
588 cookie_len = asoc->peer.cookie_len;
590 /* Build a cookie echo chunk. */
591 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
592 cookie_len, GFP_ATOMIC);
595 retval->subh.cookie_hdr =
596 sctp_addto_chunk(retval, cookie_len, cookie);
598 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
600 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
601 * HEARTBEAT ACK, * etc.) to the same destination transport
602 * address from which it * received the DATA or control chunk
603 * to which it is replying.
605 * [COOKIE ECHO back to where the INIT ACK came from.]
608 retval->transport = chunk->transport;
614 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
616 * This chunk is used only during the initialization of an
617 * association. It is used to acknowledge the receipt of a COOKIE
618 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
619 * within the association, but MAY be bundled with one or more DATA
620 * chunks or SACK chunk in the same SCTP packet.
623 * 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
624 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
625 * | Type = 11 |Chunk Flags | Length = 4 |
626 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
628 * Chunk Flags: 8 bits
630 * Set to zero on transmit and ignored on receipt.
632 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
633 const struct sctp_chunk *chunk)
635 struct sctp_chunk *retval;
637 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
639 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
641 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
642 * HEARTBEAT ACK, * etc.) to the same destination transport
643 * address from which it * received the DATA or control chunk
644 * to which it is replying.
646 * [COOKIE ACK back to where the COOKIE ECHO came from.]
648 if (retval && chunk && chunk->transport)
650 sctp_assoc_lookup_paddr(asoc,
651 &chunk->transport->ipaddr);
657 * Appendix A: Explicit Congestion Notification:
660 * RFC 2481 details a specific bit for a sender to send in the header of
661 * its next outbound TCP segment to indicate to its peer that it has
662 * reduced its congestion window. This is termed the CWR bit. For
663 * SCTP the same indication is made by including the CWR chunk.
664 * This chunk contains one data element, i.e. the TSN number that
665 * was sent in the ECNE chunk. This element represents the lowest
666 * TSN number in the datagram that was originally marked with the
670 * 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
671 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
672 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
673 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
674 * | Lowest TSN Number |
675 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
677 * Note: The CWR is considered a Control chunk.
679 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
680 const __u32 lowest_tsn,
681 const struct sctp_chunk *chunk)
683 struct sctp_chunk *retval;
684 struct sctp_cwrhdr cwr;
686 cwr.lowest_tsn = htonl(lowest_tsn);
687 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
688 sizeof(cwr), GFP_ATOMIC);
693 retval->subh.ecn_cwr_hdr =
694 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
696 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
698 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
699 * HEARTBEAT ACK, * etc.) to the same destination transport
700 * address from which it * received the DATA or control chunk
701 * to which it is replying.
703 * [Report a reduced congestion window back to where the ECNE
707 retval->transport = chunk->transport;
713 /* Make an ECNE chunk. This is a congestion experienced report. */
714 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
715 const __u32 lowest_tsn)
717 struct sctp_chunk *retval;
718 struct sctp_ecnehdr ecne;
720 ecne.lowest_tsn = htonl(lowest_tsn);
721 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
722 sizeof(ecne), GFP_ATOMIC);
725 retval->subh.ecne_hdr =
726 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
732 /* Make a DATA chunk for the given association from the provided
733 * parameters. However, do not populate the data payload.
735 struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc,
736 const struct sctp_sndrcvinfo *sinfo,
737 int len, __u8 flags, gfp_t gfp)
739 struct sctp_chunk *retval;
740 struct sctp_datahdr dp;
742 /* We assign the TSN as LATE as possible, not here when
743 * creating the chunk.
745 memset(&dp, 0, sizeof(dp));
746 dp.ppid = sinfo->sinfo_ppid;
747 dp.stream = htons(sinfo->sinfo_stream);
749 /* Set the flags for an unordered send. */
750 if (sinfo->sinfo_flags & SCTP_UNORDERED)
751 flags |= SCTP_DATA_UNORDERED;
753 retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp);
757 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
758 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
763 /* Create a selective ackowledgement (SACK) for the given
764 * association. This reports on which TSN's we've seen to date,
765 * including duplicates and gaps.
767 struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc)
769 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
770 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
771 __u16 num_gabs, num_dup_tsns;
772 struct sctp_transport *trans;
773 struct sctp_chunk *retval;
774 struct sctp_sackhdr sack;
778 memset(gabs, 0, sizeof(gabs));
779 ctsn = sctp_tsnmap_get_ctsn(map);
781 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
783 /* How much room is needed in the chunk? */
784 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
785 num_dup_tsns = sctp_tsnmap_num_dups(map);
787 /* Initialize the SACK header. */
788 sack.cum_tsn_ack = htonl(ctsn);
789 sack.a_rwnd = htonl(asoc->a_rwnd);
790 sack.num_gap_ack_blocks = htons(num_gabs);
791 sack.num_dup_tsns = htons(num_dup_tsns);
794 + sizeof(struct sctp_gap_ack_block) * num_gabs
795 + sizeof(__u32) * num_dup_tsns;
797 /* Create the chunk. */
798 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
802 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
804 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
805 * HEARTBEAT ACK, etc.) to the same destination transport
806 * address from which it received the DATA or control chunk to
807 * which it is replying. This rule should also be followed if
808 * the endpoint is bundling DATA chunks together with the
811 * However, when acknowledging multiple DATA chunks received
812 * in packets from different source addresses in a single
813 * SACK, the SACK chunk may be transmitted to one of the
814 * destination transport addresses from which the DATA or
815 * control chunks being acknowledged were received.
817 * [BUG: We do not implement the following paragraph.
818 * Perhaps we should remember the last transport we used for a
819 * SACK and avoid that (if possible) if we have seen any
820 * duplicates. --piggy]
822 * When a receiver of a duplicate DATA chunk sends a SACK to a
823 * multi- homed endpoint it MAY be beneficial to vary the
824 * destination address and not use the source address of the
825 * DATA chunk. The reason being that receiving a duplicate
826 * from a multi-homed endpoint might indicate that the return
827 * path (as specified in the source address of the DATA chunk)
828 * for the SACK is broken.
830 * [Send to the address from which we last received a DATA chunk.]
832 retval->transport = asoc->peer.last_data_from;
834 retval->subh.sack_hdr =
835 sctp_addto_chunk(retval, sizeof(sack), &sack);
837 /* Add the gap ack block information. */
839 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
842 /* Add the duplicate TSN information. */
844 asoc->stats.idupchunks += num_dup_tsns;
845 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
846 sctp_tsnmap_get_dups(map));
848 /* Once we have a sack generated, check to see what our sack
849 * generation is, if its 0, reset the transports to 0, and reset
850 * the association generation to 1
852 * The idea is that zero is never used as a valid generation for the
853 * association so no transport will match after a wrap event like this,
854 * Until the next sack
856 if (++asoc->peer.sack_generation == 0) {
857 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
859 trans->sack_generation = 0;
860 asoc->peer.sack_generation = 1;
866 /* Make a SHUTDOWN chunk. */
867 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
868 const struct sctp_chunk *chunk)
870 struct sctp_shutdownhdr shut;
871 struct sctp_chunk *retval;
874 if (chunk && chunk->asoc)
875 ctsn = sctp_tsnmap_get_ctsn(&chunk->asoc->peer.tsn_map);
877 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
879 shut.cum_tsn_ack = htonl(ctsn);
881 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
882 sizeof(shut), GFP_ATOMIC);
886 retval->subh.shutdown_hdr =
887 sctp_addto_chunk(retval, sizeof(shut), &shut);
890 retval->transport = chunk->transport;
895 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
896 const struct sctp_chunk *chunk)
898 struct sctp_chunk *retval;
900 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
903 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
905 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
906 * HEARTBEAT ACK, * etc.) to the same destination transport
907 * address from which it * received the DATA or control chunk
908 * to which it is replying.
910 * [ACK back to where the SHUTDOWN came from.]
913 retval->transport = chunk->transport;
918 struct sctp_chunk *sctp_make_shutdown_complete(
919 const struct sctp_association *asoc,
920 const struct sctp_chunk *chunk)
922 struct sctp_chunk *retval;
925 /* Set the T-bit if we have no association (vtag will be
928 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
930 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
933 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
935 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
936 * HEARTBEAT ACK, * etc.) to the same destination transport
937 * address from which it * received the DATA or control chunk
938 * to which it is replying.
940 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
944 retval->transport = chunk->transport;
949 /* Create an ABORT. Note that we set the T bit if we have no
950 * association, except when responding to an INIT (sctpimpguide 2.41).
952 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
953 const struct sctp_chunk *chunk,
956 struct sctp_chunk *retval;
959 /* Set the T-bit if we have no association and 'chunk' is not
960 * an INIT (vtag will be reflected).
963 if (chunk && chunk->chunk_hdr &&
964 chunk->chunk_hdr->type == SCTP_CID_INIT)
967 flags = SCTP_CHUNK_FLAG_T;
970 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
973 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
975 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
976 * HEARTBEAT ACK, * etc.) to the same destination transport
977 * address from which it * received the DATA or control chunk
978 * to which it is replying.
980 * [ABORT back to where the offender came from.]
983 retval->transport = chunk->transport;
988 /* Helper to create ABORT with a NO_USER_DATA error. */
989 struct sctp_chunk *sctp_make_abort_no_data(
990 const struct sctp_association *asoc,
991 const struct sctp_chunk *chunk,
994 struct sctp_chunk *retval;
997 retval = sctp_make_abort(asoc, chunk,
998 sizeof(struct sctp_errhdr) + sizeof(tsn));
1003 /* Put the tsn back into network byte order. */
1004 payload = htonl(tsn);
1005 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
1006 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
1008 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1010 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1011 * HEARTBEAT ACK, * etc.) to the same destination transport
1012 * address from which it * received the DATA or control chunk
1013 * to which it is replying.
1015 * [ABORT back to where the offender came from.]
1018 retval->transport = chunk->transport;
1024 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1025 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1029 struct sctp_chunk *retval;
1030 void *payload = NULL;
1033 retval = sctp_make_abort(asoc, NULL,
1034 sizeof(struct sctp_errhdr) + paylen);
1039 /* Put the msg_iov together into payload. */
1040 payload = kmalloc(paylen, GFP_KERNEL);
1044 err = memcpy_from_msg(payload, msg, paylen);
1049 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1050 sctp_addto_chunk(retval, paylen, payload);
1060 sctp_chunk_free(retval);
1066 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1069 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1072 int chunklen = ntohs(chunk->chunk_hdr->length);
1075 target = skb_put(chunk->skb, len);
1078 memcpy(target, data, len);
1080 memset(target, 0, len);
1082 /* Adjust the chunk length field. */
1083 chunk->chunk_hdr->length = htons(chunklen + len);
1084 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1089 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1090 struct sctp_chunk *sctp_make_abort_violation(
1091 const struct sctp_association *asoc,
1092 const struct sctp_chunk *chunk,
1093 const __u8 *payload,
1094 const size_t paylen)
1096 struct sctp_chunk *retval;
1097 struct sctp_paramhdr phdr;
1099 retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) +
1100 paylen + sizeof(phdr));
1104 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen +
1107 phdr.type = htons(chunk->chunk_hdr->type);
1108 phdr.length = chunk->chunk_hdr->length;
1109 sctp_addto_chunk(retval, paylen, payload);
1110 sctp_addto_param(retval, sizeof(phdr), &phdr);
1116 struct sctp_chunk *sctp_make_violation_paramlen(
1117 const struct sctp_association *asoc,
1118 const struct sctp_chunk *chunk,
1119 struct sctp_paramhdr *param)
1121 static const char error[] = "The following parameter had invalid length:";
1122 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) +
1124 struct sctp_chunk *retval;
1126 retval = sctp_make_abort(asoc, chunk, payload_len);
1130 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1131 sizeof(error) + sizeof(*param));
1132 sctp_addto_chunk(retval, sizeof(error), error);
1133 sctp_addto_param(retval, sizeof(*param), param);
1139 struct sctp_chunk *sctp_make_violation_max_retrans(
1140 const struct sctp_association *asoc,
1141 const struct sctp_chunk *chunk)
1143 static const char error[] = "Association exceeded its max_retrans count";
1144 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr);
1145 struct sctp_chunk *retval;
1147 retval = sctp_make_abort(asoc, chunk, payload_len);
1151 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1152 sctp_addto_chunk(retval, sizeof(error), error);
1158 /* Make a HEARTBEAT chunk. */
1159 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1160 const struct sctp_transport *transport)
1162 struct sctp_sender_hb_info hbinfo;
1163 struct sctp_chunk *retval;
1165 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1166 sizeof(hbinfo), GFP_ATOMIC);
1171 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1172 hbinfo.param_hdr.length = htons(sizeof(hbinfo));
1173 hbinfo.daddr = transport->ipaddr;
1174 hbinfo.sent_at = jiffies;
1175 hbinfo.hb_nonce = transport->hb_nonce;
1177 /* Cast away the 'const', as this is just telling the chunk
1178 * what transport it belongs to.
1180 retval->transport = (struct sctp_transport *) transport;
1181 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1188 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1189 const struct sctp_chunk *chunk,
1190 const void *payload,
1191 const size_t paylen)
1193 struct sctp_chunk *retval;
1195 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1200 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1202 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1204 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1205 * HEARTBEAT ACK, * etc.) to the same destination transport
1206 * address from which it * received the DATA or control chunk
1207 * to which it is replying.
1209 * [HBACK back to where the HEARTBEAT came from.]
1212 retval->transport = chunk->transport;
1218 /* Create an Operation Error chunk with the specified space reserved.
1219 * This routine can be used for containing multiple causes in the chunk.
1221 static struct sctp_chunk *sctp_make_op_error_space(
1222 const struct sctp_association *asoc,
1223 const struct sctp_chunk *chunk,
1226 struct sctp_chunk *retval;
1228 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1229 sizeof(struct sctp_errhdr) + size,
1234 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1236 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1237 * HEARTBEAT ACK, etc.) to the same destination transport
1238 * address from which it received the DATA or control chunk
1239 * to which it is replying.
1243 retval->transport = chunk->transport;
1249 /* Create an Operation Error chunk of a fixed size, specifically,
1250 * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads.
1251 * This is a helper function to allocate an error chunk for for those
1252 * invalid parameter codes in which we may not want to report all the
1253 * errors, if the incoming chunk is large. If it can't fit in a single
1254 * packet, we ignore it.
1256 static inline struct sctp_chunk *sctp_make_op_error_limited(
1257 const struct sctp_association *asoc,
1258 const struct sctp_chunk *chunk)
1260 size_t size = SCTP_DEFAULT_MAXSEGMENT;
1261 struct sctp_sock *sp = NULL;
1264 size = min_t(size_t, size, asoc->pathmtu);
1265 sp = sctp_sk(asoc->base.sk);
1268 size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr));
1270 return sctp_make_op_error_space(asoc, chunk, size);
1273 /* Create an Operation Error chunk. */
1274 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1275 const struct sctp_chunk *chunk,
1276 __be16 cause_code, const void *payload,
1277 size_t paylen, size_t reserve_tail)
1279 struct sctp_chunk *retval;
1281 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1285 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1286 sctp_addto_chunk(retval, paylen, payload);
1288 sctp_addto_param(retval, reserve_tail, NULL);
1294 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc,
1297 struct sctp_authhdr auth_hdr;
1298 struct sctp_hmac *hmac_desc;
1299 struct sctp_chunk *retval;
1301 /* Get the first hmac that the peer told us to use */
1302 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1303 if (unlikely(!hmac_desc))
1306 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1307 hmac_desc->hmac_len + sizeof(auth_hdr),
1312 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1313 auth_hdr.shkey_id = htons(key_id);
1315 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr),
1318 skb_put_zero(retval->skb, hmac_desc->hmac_len);
1320 /* Adjust the chunk header to include the empty MAC */
1321 retval->chunk_hdr->length =
1322 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1323 retval->chunk_end = skb_tail_pointer(retval->skb);
1329 /********************************************************************
1330 * 2nd Level Abstractions
1331 ********************************************************************/
1333 /* Turn an skb into a chunk.
1334 * FIXME: Eventually move the structure directly inside the skb->cb[].
1336 * sctpimpguide-05.txt Section 2.8.2
1337 * M1) Each time a new DATA chunk is transmitted
1338 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1339 * 'TSN.Missing.Report' count will be used to determine missing chunks
1340 * and when to fast retransmit.
1343 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1344 const struct sctp_association *asoc,
1345 struct sock *sk, gfp_t gfp)
1347 struct sctp_chunk *retval;
1349 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1354 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1356 INIT_LIST_HEAD(&retval->list);
1358 retval->asoc = (struct sctp_association *)asoc;
1359 retval->singleton = 1;
1361 retval->fast_retransmit = SCTP_CAN_FRTX;
1363 /* Polish the bead hole. */
1364 INIT_LIST_HEAD(&retval->transmitted_list);
1365 INIT_LIST_HEAD(&retval->frag_list);
1366 SCTP_DBG_OBJCNT_INC(chunk);
1367 refcount_set(&retval->refcnt, 1);
1373 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1374 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1375 union sctp_addr *dest)
1377 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1378 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1381 /* Extract the source address from a chunk. */
1382 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1384 /* If we have a known transport, use that. */
1385 if (chunk->transport) {
1386 return &chunk->transport->ipaddr;
1388 /* Otherwise, extract it from the IP header. */
1389 return &chunk->source;
1393 /* Create a new chunk, setting the type and flags headers from the
1394 * arguments, reserving enough space for a 'paylen' byte payload.
1396 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1397 __u8 type, __u8 flags, int paylen,
1400 struct sctp_chunkhdr *chunk_hdr;
1401 struct sctp_chunk *retval;
1402 struct sk_buff *skb;
1406 chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen);
1407 if (chunklen > SCTP_MAX_CHUNK_LEN)
1410 /* No need to allocate LL here, as this is only a chunk. */
1411 skb = alloc_skb(chunklen, gfp);
1415 /* Make room for the chunk header. */
1416 chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr));
1417 chunk_hdr->type = type;
1418 chunk_hdr->flags = flags;
1419 chunk_hdr->length = htons(sizeof(*chunk_hdr));
1421 sk = asoc ? asoc->base.sk : NULL;
1422 retval = sctp_chunkify(skb, asoc, sk, gfp);
1428 retval->chunk_hdr = chunk_hdr;
1429 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr);
1431 /* Determine if the chunk needs to be authenticated */
1432 if (sctp_auth_send_cid(type, asoc))
1440 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1441 __u8 flags, int paylen, gfp_t gfp)
1443 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1446 struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,
1447 __u8 flags, int paylen, gfp_t gfp)
1449 return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp);
1452 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1453 __u8 type, __u8 flags, int paylen,
1456 struct sctp_chunk *chunk;
1458 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1460 sctp_control_set_owner_w(chunk);
1465 /* Release the memory occupied by a chunk. */
1466 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1468 BUG_ON(!list_empty(&chunk->list));
1469 list_del_init(&chunk->transmitted_list);
1471 consume_skb(chunk->skb);
1472 consume_skb(chunk->auth_chunk);
1474 SCTP_DBG_OBJCNT_DEC(chunk);
1475 kmem_cache_free(sctp_chunk_cachep, chunk);
1478 /* Possibly, free the chunk. */
1479 void sctp_chunk_free(struct sctp_chunk *chunk)
1481 /* Release our reference on the message tracker. */
1483 sctp_datamsg_put(chunk->msg);
1485 sctp_chunk_put(chunk);
1488 /* Grab a reference to the chunk. */
1489 void sctp_chunk_hold(struct sctp_chunk *ch)
1491 refcount_inc(&ch->refcnt);
1494 /* Release a reference to the chunk. */
1495 void sctp_chunk_put(struct sctp_chunk *ch)
1497 if (refcount_dec_and_test(&ch->refcnt))
1498 sctp_chunk_destroy(ch);
1501 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1504 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1506 int chunklen = ntohs(chunk->chunk_hdr->length);
1507 int padlen = SCTP_PAD4(chunklen) - chunklen;
1510 skb_put_zero(chunk->skb, padlen);
1511 target = skb_put_data(chunk->skb, data, len);
1513 /* Adjust the chunk length field. */
1514 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1515 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1520 /* Append bytes from user space to the end of a chunk. Will panic if
1521 * chunk is not big enough.
1522 * Returns a kernel err value.
1524 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1525 struct iov_iter *from)
1529 /* Make room in chunk for data. */
1530 target = skb_put(chunk->skb, len);
1532 /* Copy data (whole iovec) into chunk */
1533 if (!copy_from_iter_full(target, len, from))
1536 /* Adjust the chunk length field. */
1537 chunk->chunk_hdr->length =
1538 htons(ntohs(chunk->chunk_hdr->length) + len);
1539 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1544 /* Helper function to assign a TSN if needed. This assumes that both
1545 * the data_hdr and association have already been assigned.
1547 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1549 struct sctp_stream *stream;
1550 struct sctp_chunk *lchunk;
1551 struct sctp_datamsg *msg;
1557 /* All fragments will be on the same stream */
1558 sid = ntohs(chunk->subh.data_hdr->stream);
1559 stream = &chunk->asoc->stream;
1561 /* Now assign the sequence number to the entire message.
1562 * All fragments must have the same stream sequence number.
1565 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1566 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1569 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1570 ssn = sctp_ssn_next(stream, out, sid);
1572 ssn = sctp_ssn_peek(stream, out, sid);
1575 lchunk->subh.data_hdr->ssn = htons(ssn);
1576 lchunk->has_ssn = 1;
1580 /* Helper function to assign a TSN if needed. This assumes that both
1581 * the data_hdr and association have already been assigned.
1583 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1585 if (!chunk->has_tsn) {
1586 /* This is the last possible instant to
1589 chunk->subh.data_hdr->tsn =
1590 htonl(sctp_association_get_next_tsn(chunk->asoc));
1595 /* Create a CLOSED association to use with an incoming packet. */
1596 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1597 struct sctp_chunk *chunk,
1600 struct sctp_association *asoc;
1601 enum sctp_scope scope;
1602 struct sk_buff *skb;
1604 /* Create the bare association. */
1605 scope = sctp_scope(sctp_source(chunk));
1606 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1611 /* Create an entry for the source address of the packet. */
1612 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1618 /* Build a cookie representing asoc.
1619 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1621 static struct sctp_cookie_param *sctp_pack_cookie(
1622 const struct sctp_endpoint *ep,
1623 const struct sctp_association *asoc,
1624 const struct sctp_chunk *init_chunk,
1625 int *cookie_len, const __u8 *raw_addrs,
1628 struct sctp_signed_cookie *cookie;
1629 struct sctp_cookie_param *retval;
1630 int headersize, bodysize;
1632 /* Header size is static data prior to the actual cookie, including
1635 headersize = sizeof(struct sctp_paramhdr) +
1636 (sizeof(struct sctp_signed_cookie) -
1637 sizeof(struct sctp_cookie));
1638 bodysize = sizeof(struct sctp_cookie)
1639 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1641 /* Pad out the cookie to a multiple to make the signature
1642 * functions simpler to write.
1644 if (bodysize % SCTP_COOKIE_MULTIPLE)
1645 bodysize += SCTP_COOKIE_MULTIPLE
1646 - (bodysize % SCTP_COOKIE_MULTIPLE);
1647 *cookie_len = headersize + bodysize;
1649 /* Clear this memory since we are sending this data structure
1650 * out on the network.
1652 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1656 cookie = (struct sctp_signed_cookie *) retval->body;
1658 /* Set up the parameter header. */
1659 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1660 retval->p.length = htons(*cookie_len);
1662 /* Copy the cookie part of the association itself. */
1663 cookie->c = asoc->c;
1664 /* Save the raw address list length in the cookie. */
1665 cookie->c.raw_addr_list_len = addrs_len;
1667 /* Remember PR-SCTP capability. */
1668 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1670 /* Save adaptation indication in the cookie. */
1671 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1673 /* Set an expiration time for the cookie. */
1674 cookie->c.expiration = ktime_add(asoc->cookie_life,
1677 /* Copy the peer's init packet. */
1678 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1679 ntohs(init_chunk->chunk_hdr->length));
1681 /* Copy the raw local address list of the association. */
1682 memcpy((__u8 *)&cookie->c.peer_init[0] +
1683 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1685 if (sctp_sk(ep->base.sk)->hmac) {
1686 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1689 /* Sign the message. */
1690 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1693 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1694 sizeof(ep->secret_key)) ?:
1695 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1697 shash_desc_zero(desc);
1711 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1712 struct sctp_association *sctp_unpack_cookie(
1713 const struct sctp_endpoint *ep,
1714 const struct sctp_association *asoc,
1715 struct sctp_chunk *chunk, gfp_t gfp,
1716 int *error, struct sctp_chunk **errp)
1718 struct sctp_association *retval = NULL;
1719 int headersize, bodysize, fixed_size;
1720 struct sctp_signed_cookie *cookie;
1721 struct sk_buff *skb = chunk->skb;
1722 struct sctp_cookie *bear_cookie;
1723 __u8 *digest = ep->digest;
1724 enum sctp_scope scope;
1728 /* Header size is static data prior to the actual cookie, including
1731 headersize = sizeof(struct sctp_chunkhdr) +
1732 (sizeof(struct sctp_signed_cookie) -
1733 sizeof(struct sctp_cookie));
1734 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1735 fixed_size = headersize + sizeof(struct sctp_cookie);
1737 /* Verify that the chunk looks like it even has a cookie.
1738 * There must be enough room for our cookie and our peer's
1741 len = ntohs(chunk->chunk_hdr->length);
1742 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1745 /* Verify that the cookie has been padded out. */
1746 if (bodysize % SCTP_COOKIE_MULTIPLE)
1749 /* Process the cookie. */
1750 cookie = chunk->subh.cookie_hdr;
1751 bear_cookie = &cookie->c;
1753 if (!sctp_sk(ep->base.sk)->hmac)
1756 /* Check the signature. */
1758 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1761 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1764 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1765 sizeof(ep->secret_key)) ?:
1766 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1768 shash_desc_zero(desc);
1771 *error = -SCTP_IERROR_NOMEM;
1776 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1777 *error = -SCTP_IERROR_BAD_SIG;
1782 /* IG Section 2.35.2:
1783 * 3) Compare the port numbers and the verification tag contained
1784 * within the COOKIE ECHO chunk to the actual port numbers and the
1785 * verification tag within the SCTP common header of the received
1786 * packet. If these values do not match the packet MUST be silently
1789 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1790 *error = -SCTP_IERROR_BAD_TAG;
1794 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1795 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1796 *error = -SCTP_IERROR_BAD_PORTS;
1800 /* Check to see if the cookie is stale. If there is already
1801 * an association, there is no need to check cookie's expiration
1802 * for init collision case of lost COOKIE ACK.
1803 * If skb has been timestamped, then use the stamp, otherwise
1804 * use current time. This introduces a small possibility that
1805 * that a cookie may be considered expired, but his would only slow
1806 * down the new association establishment instead of every packet.
1808 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1809 kt = skb_get_ktime(skb);
1811 kt = ktime_get_real();
1813 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
1814 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1815 __be32 n = htonl(usecs);
1818 * Section 3.3.10.3 Stale Cookie Error (3)
1822 * Stale Cookie Error: Indicates the receipt of a valid State
1823 * Cookie that has expired.
1825 *errp = sctp_make_op_error(asoc, chunk,
1826 SCTP_ERROR_STALE_COOKIE, &n,
1829 *error = -SCTP_IERROR_STALE_COOKIE;
1831 *error = -SCTP_IERROR_NOMEM;
1836 /* Make a new base association. */
1837 scope = sctp_scope(sctp_source(chunk));
1838 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1840 *error = -SCTP_IERROR_NOMEM;
1844 /* Set up our peer's port number. */
1845 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1847 /* Populate the association from the cookie. */
1848 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1850 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1852 *error = -SCTP_IERROR_NOMEM;
1856 /* Also, add the destination address. */
1857 if (list_empty(&retval->base.bind_addr.address_list)) {
1858 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1859 sizeof(chunk->dest), SCTP_ADDR_SRC,
1863 retval->next_tsn = retval->c.initial_tsn;
1864 retval->ctsn_ack_point = retval->next_tsn - 1;
1865 retval->addip_serial = retval->c.initial_tsn;
1866 retval->strreset_outseq = retval->c.initial_tsn;
1867 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1868 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1869 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1871 /* The INIT stuff will be done by the side effects. */
1876 sctp_association_free(retval);
1881 /* Yikes! The packet is either corrupt or deliberately
1884 *error = -SCTP_IERROR_MALFORMED;
1888 /********************************************************************
1889 * 3rd Level Abstractions
1890 ********************************************************************/
1892 struct __sctp_missing {
1898 * Report a missing mandatory parameter.
1900 static int sctp_process_missing_param(const struct sctp_association *asoc,
1901 enum sctp_param paramtype,
1902 struct sctp_chunk *chunk,
1903 struct sctp_chunk **errp)
1905 struct __sctp_missing report;
1908 len = SCTP_PAD4(sizeof(report));
1910 /* Make an ERROR chunk, preparing enough room for
1911 * returning multiple unknown parameters.
1914 *errp = sctp_make_op_error_space(asoc, chunk, len);
1917 report.num_missing = htonl(1);
1918 report.type = paramtype;
1919 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1921 sctp_addto_chunk(*errp, sizeof(report), &report);
1924 /* Stop processing this chunk. */
1928 /* Report an Invalid Mandatory Parameter. */
1929 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1930 struct sctp_chunk *chunk,
1931 struct sctp_chunk **errp)
1933 /* Invalid Mandatory Parameter Error has no payload. */
1936 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1939 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1941 /* Stop processing this chunk. */
1945 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1946 struct sctp_paramhdr *param,
1947 const struct sctp_chunk *chunk,
1948 struct sctp_chunk **errp)
1950 /* This is a fatal error. Any accumulated non-fatal errors are
1954 sctp_chunk_free(*errp);
1956 /* Create an error chunk and fill it in with our payload. */
1957 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1963 /* Do not attempt to handle the HOST_NAME parm. However, do
1964 * send back an indicator to the peer.
1966 static int sctp_process_hn_param(const struct sctp_association *asoc,
1967 union sctp_params param,
1968 struct sctp_chunk *chunk,
1969 struct sctp_chunk **errp)
1971 __u16 len = ntohs(param.p->length);
1973 /* Processing of the HOST_NAME parameter will generate an
1974 * ABORT. If we've accumulated any non-fatal errors, they
1975 * would be unrecognized parameters and we should not include
1976 * them in the ABORT.
1979 sctp_chunk_free(*errp);
1981 *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED,
1984 /* Stop processing this chunk. */
1988 static int sctp_verify_ext_param(struct net *net, union sctp_params param)
1990 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
1991 int have_asconf = 0;
1995 for (i = 0; i < num_ext; i++) {
1996 switch (param.ext->chunks[i]) {
2000 case SCTP_CID_ASCONF:
2001 case SCTP_CID_ASCONF_ACK:
2007 /* ADD-IP Security: The draft requires us to ABORT or ignore the
2008 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
2009 * only if ADD-IP is turned on and we are not backward-compatible
2012 if (net->sctp.addip_noauth)
2015 if (net->sctp.addip_enable && !have_auth && have_asconf)
2021 static void sctp_process_ext_param(struct sctp_association *asoc,
2022 union sctp_params param)
2024 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2025 struct net *net = sock_net(asoc->base.sk);
2028 for (i = 0; i < num_ext; i++) {
2029 switch (param.ext->chunks[i]) {
2030 case SCTP_CID_RECONF:
2031 if (asoc->reconf_enable &&
2032 !asoc->peer.reconf_capable)
2033 asoc->peer.reconf_capable = 1;
2035 case SCTP_CID_FWD_TSN:
2036 if (asoc->prsctp_enable && !asoc->peer.prsctp_capable)
2037 asoc->peer.prsctp_capable = 1;
2040 /* if the peer reports AUTH, assume that he
2043 if (asoc->ep->auth_enable)
2044 asoc->peer.auth_capable = 1;
2046 case SCTP_CID_ASCONF:
2047 case SCTP_CID_ASCONF_ACK:
2048 if (net->sctp.addip_enable)
2049 asoc->peer.asconf_capable = 1;
2051 case SCTP_CID_I_DATA:
2052 if (sctp_sk(asoc->base.sk)->strm_interleave)
2053 asoc->intl_enable = 1;
2061 /* RFC 3.2.1 & the Implementers Guide 2.2.
2063 * The Parameter Types are encoded such that the
2064 * highest-order two bits specify the action that must be
2065 * taken if the processing endpoint does not recognize the
2068 * 00 - Stop processing this parameter; do not process any further
2069 * parameters within this chunk
2071 * 01 - Stop processing this parameter, do not process any further
2072 * parameters within this chunk, and report the unrecognized
2073 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2075 * 10 - Skip this parameter and continue processing.
2077 * 11 - Skip this parameter and continue processing but
2078 * report the unrecognized parameter in an
2079 * 'Unrecognized Parameter' ERROR chunk.
2082 * SCTP_IERROR_NO_ERROR - continue with the chunk
2083 * SCTP_IERROR_ERROR - stop and report an error.
2084 * SCTP_IERROR_NOMEME - out of memory.
2086 static enum sctp_ierror sctp_process_unk_param(
2087 const struct sctp_association *asoc,
2088 union sctp_params param,
2089 struct sctp_chunk *chunk,
2090 struct sctp_chunk **errp)
2092 int retval = SCTP_IERROR_NO_ERROR;
2094 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2095 case SCTP_PARAM_ACTION_DISCARD:
2096 retval = SCTP_IERROR_ERROR;
2098 case SCTP_PARAM_ACTION_SKIP:
2100 case SCTP_PARAM_ACTION_DISCARD_ERR:
2101 retval = SCTP_IERROR_ERROR;
2103 case SCTP_PARAM_ACTION_SKIP_ERR:
2104 /* Make an ERROR chunk, preparing enough room for
2105 * returning multiple unknown parameters.
2108 *errp = sctp_make_op_error_limited(asoc, chunk);
2110 /* If there is no memory for generating the
2111 * ERROR report as specified, an ABORT will be
2112 * triggered to the peer and the association
2113 * won't be established.
2115 retval = SCTP_IERROR_NOMEM;
2120 if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2121 ntohs(param.p->length)))
2122 sctp_addto_chunk(*errp, ntohs(param.p->length),
2132 /* Verify variable length parameters
2134 * SCTP_IERROR_ABORT - trigger an ABORT
2135 * SCTP_IERROR_NOMEM - out of memory (abort)
2136 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2137 * SCTP_IERROR_NO_ERROR - continue with the chunk
2139 static enum sctp_ierror sctp_verify_param(struct net *net,
2140 const struct sctp_endpoint *ep,
2141 const struct sctp_association *asoc,
2142 union sctp_params param,
2144 struct sctp_chunk *chunk,
2145 struct sctp_chunk **err_chunk)
2147 struct sctp_hmac_algo_param *hmacs;
2148 int retval = SCTP_IERROR_NO_ERROR;
2149 __u16 n_elt, id = 0;
2152 /* FIXME - This routine is not looking at each parameter per the
2153 * chunk type, i.e., unrecognized parameters should be further
2154 * identified based on the chunk id.
2157 switch (param.p->type) {
2158 case SCTP_PARAM_IPV4_ADDRESS:
2159 case SCTP_PARAM_IPV6_ADDRESS:
2160 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2161 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2162 case SCTP_PARAM_STATE_COOKIE:
2163 case SCTP_PARAM_HEARTBEAT_INFO:
2164 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2165 case SCTP_PARAM_ECN_CAPABLE:
2166 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2169 case SCTP_PARAM_SUPPORTED_EXT:
2170 if (!sctp_verify_ext_param(net, param))
2171 return SCTP_IERROR_ABORT;
2174 case SCTP_PARAM_SET_PRIMARY:
2175 if (!net->sctp.addip_enable)
2178 if (ntohs(param.p->length) < sizeof(struct sctp_addip_param) +
2179 sizeof(struct sctp_paramhdr)) {
2180 sctp_process_inv_paramlength(asoc, param.p,
2182 retval = SCTP_IERROR_ABORT;
2186 case SCTP_PARAM_HOST_NAME_ADDRESS:
2187 /* Tell the peer, we won't support this param. */
2188 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2189 retval = SCTP_IERROR_ABORT;
2192 case SCTP_PARAM_FWD_TSN_SUPPORT:
2193 if (ep->prsctp_enable)
2197 case SCTP_PARAM_RANDOM:
2198 if (!ep->auth_enable)
2201 /* SCTP-AUTH: Secion 6.1
2202 * If the random number is not 32 byte long the association
2203 * MUST be aborted. The ABORT chunk SHOULD contain the error
2204 * cause 'Protocol Violation'.
2206 if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) -
2207 sizeof(struct sctp_paramhdr)) {
2208 sctp_process_inv_paramlength(asoc, param.p,
2210 retval = SCTP_IERROR_ABORT;
2214 case SCTP_PARAM_CHUNKS:
2215 if (!ep->auth_enable)
2218 /* SCTP-AUTH: Section 3.2
2219 * The CHUNKS parameter MUST be included once in the INIT or
2220 * INIT-ACK chunk if the sender wants to receive authenticated
2221 * chunks. Its maximum length is 260 bytes.
2223 if (260 < ntohs(param.p->length)) {
2224 sctp_process_inv_paramlength(asoc, param.p,
2226 retval = SCTP_IERROR_ABORT;
2230 case SCTP_PARAM_HMAC_ALGO:
2231 if (!ep->auth_enable)
2234 hmacs = (struct sctp_hmac_algo_param *)param.p;
2235 n_elt = (ntohs(param.p->length) -
2236 sizeof(struct sctp_paramhdr)) >> 1;
2238 /* SCTP-AUTH: Section 6.1
2239 * The HMAC algorithm based on SHA-1 MUST be supported and
2240 * included in the HMAC-ALGO parameter.
2242 for (i = 0; i < n_elt; i++) {
2243 id = ntohs(hmacs->hmac_ids[i]);
2245 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2249 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2250 sctp_process_inv_paramlength(asoc, param.p, chunk,
2252 retval = SCTP_IERROR_ABORT;
2257 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2258 __func__, ntohs(param.p->type), cid);
2260 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2266 /* Verify the INIT packet before we process it. */
2267 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2268 const struct sctp_association *asoc, enum sctp_cid cid,
2269 struct sctp_init_chunk *peer_init,
2270 struct sctp_chunk *chunk, struct sctp_chunk **errp)
2272 union sctp_params param;
2273 bool has_cookie = false;
2276 /* Check for missing mandatory parameters. Note: Initial TSN is
2277 * also mandatory, but is not checked here since the valid range
2278 * is 0..2**32-1. RFC4960, section 3.3.3.
2280 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2281 peer_init->init_hdr.num_inbound_streams == 0 ||
2282 peer_init->init_hdr.init_tag == 0 ||
2283 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2284 return sctp_process_inv_mandatory(asoc, chunk, errp);
2286 sctp_walk_params(param, peer_init, init_hdr.params) {
2287 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2291 /* There is a possibility that a parameter length was bad and
2292 * in that case we would have stoped walking the parameters.
2293 * The current param.p would point at the bad one.
2294 * Current consensus on the mailing list is to generate a PROTOCOL
2295 * VIOLATION error. We build the ERROR chunk here and let the normal
2296 * error handling code build and send the packet.
2298 if (param.v != (void *)chunk->chunk_end)
2299 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2301 /* The only missing mandatory param possible today is
2302 * the state cookie for an INIT-ACK chunk.
2304 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2305 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2308 /* Verify all the variable length parameters */
2309 sctp_walk_params(param, peer_init, init_hdr.params) {
2310 result = sctp_verify_param(net, ep, asoc, param, cid,
2313 case SCTP_IERROR_ABORT:
2314 case SCTP_IERROR_NOMEM:
2316 case SCTP_IERROR_ERROR:
2318 case SCTP_IERROR_NO_ERROR:
2323 } /* for (loop through all parameters) */
2328 /* Unpack the parameters in an INIT packet into an association.
2329 * Returns 0 on failure, else success.
2330 * FIXME: This is an association method.
2332 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2333 const union sctp_addr *peer_addr,
2334 struct sctp_init_chunk *peer_init, gfp_t gfp)
2336 struct net *net = sock_net(asoc->base.sk);
2337 struct sctp_transport *transport;
2338 struct list_head *pos, *temp;
2339 union sctp_params param;
2340 union sctp_addr addr;
2344 /* We must include the address that the INIT packet came from.
2345 * This is the only address that matters for an INIT packet.
2346 * When processing a COOKIE ECHO, we retrieve the from address
2347 * of the INIT from the cookie.
2350 /* This implementation defaults to making the first transport
2351 * added as the primary transport. The source address seems to
2352 * be a a better choice than any of the embedded addresses.
2354 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2357 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2360 /* Process the initialization parameters. */
2361 sctp_walk_params(param, peer_init, init_hdr.params) {
2363 (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2364 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2365 af = sctp_get_af_specific(param_type2af(param.p->type));
2366 if (!af->from_addr_param(&addr, param.addr,
2367 chunk->sctp_hdr->source, 0))
2369 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2373 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2377 /* source address of chunk may not match any valid address */
2381 /* AUTH: After processing the parameters, make sure that we
2382 * have all the required info to potentially do authentications.
2384 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2385 !asoc->peer.peer_hmacs))
2386 asoc->peer.auth_capable = 0;
2388 /* In a non-backward compatible mode, if the peer claims
2389 * support for ADD-IP but not AUTH, the ADD-IP spec states
2390 * that we MUST ABORT the association. Section 6. The section
2391 * also give us an option to silently ignore the packet, which
2392 * is what we'll do here.
2394 if (!net->sctp.addip_noauth &&
2395 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2396 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2398 SCTP_PARAM_SET_PRIMARY);
2399 asoc->peer.asconf_capable = 0;
2403 /* Walk list of transports, removing transports in the UNKNOWN state. */
2404 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2405 transport = list_entry(pos, struct sctp_transport, transports);
2406 if (transport->state == SCTP_UNKNOWN) {
2407 sctp_assoc_rm_peer(asoc, transport);
2411 /* The fixed INIT headers are always in network byte
2414 asoc->peer.i.init_tag =
2415 ntohl(peer_init->init_hdr.init_tag);
2416 asoc->peer.i.a_rwnd =
2417 ntohl(peer_init->init_hdr.a_rwnd);
2418 asoc->peer.i.num_outbound_streams =
2419 ntohs(peer_init->init_hdr.num_outbound_streams);
2420 asoc->peer.i.num_inbound_streams =
2421 ntohs(peer_init->init_hdr.num_inbound_streams);
2422 asoc->peer.i.initial_tsn =
2423 ntohl(peer_init->init_hdr.initial_tsn);
2425 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2427 /* Apply the upper bounds for output streams based on peer's
2428 * number of inbound streams.
2430 if (asoc->c.sinit_num_ostreams >
2431 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2432 asoc->c.sinit_num_ostreams =
2433 ntohs(peer_init->init_hdr.num_inbound_streams);
2436 if (asoc->c.sinit_max_instreams >
2437 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2438 asoc->c.sinit_max_instreams =
2439 ntohs(peer_init->init_hdr.num_outbound_streams);
2442 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2443 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2445 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2446 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2448 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2449 * high (for example, implementations MAY use the size of the receiver
2450 * advertised window).
2452 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2454 transport->ssthresh = asoc->peer.i.a_rwnd;
2457 /* Set up the TSN tracking pieces. */
2458 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2459 asoc->peer.i.initial_tsn, gfp))
2462 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2464 * The stream sequence number in all the streams shall start
2465 * from 0 when the association is established. Also, when the
2466 * stream sequence number reaches the value 65535 the next
2467 * stream sequence number shall be set to 0.
2470 if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
2471 asoc->c.sinit_max_instreams, gfp))
2474 /* Update frag_point when stream_interleave may get changed. */
2475 sctp_assoc_update_frag_point(asoc);
2477 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2480 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2482 * When an endpoint has an ASCONF signaled change to be sent to the
2483 * remote endpoint it should do the following:
2485 * A2) A serial number should be assigned to the Chunk. The serial
2486 * number should be a monotonically increasing number. All serial
2487 * numbers are defined to be initialized at the start of the
2488 * association to the same value as the Initial TSN.
2490 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2494 /* Release the transport structures. */
2495 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2496 transport = list_entry(pos, struct sctp_transport, transports);
2497 if (transport->state != SCTP_ACTIVE)
2498 sctp_assoc_rm_peer(asoc, transport);
2506 /* Update asoc with the option described in param.
2508 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2510 * asoc is the association to update.
2511 * param is the variable length parameter to use for update.
2512 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2513 * If the current packet is an INIT we want to minimize the amount of
2514 * work we do. In particular, we should not build transport
2515 * structures for the addresses.
2517 static int sctp_process_param(struct sctp_association *asoc,
2518 union sctp_params param,
2519 const union sctp_addr *peer_addr,
2522 struct net *net = sock_net(asoc->base.sk);
2523 struct sctp_endpoint *ep = asoc->ep;
2524 union sctp_addr_param *addr_param;
2525 struct sctp_transport *t;
2526 enum sctp_scope scope;
2527 union sctp_addr addr;
2533 /* We maintain all INIT parameters in network byte order all the
2534 * time. This allows us to not worry about whether the parameters
2535 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2537 switch (param.p->type) {
2538 case SCTP_PARAM_IPV6_ADDRESS:
2539 if (PF_INET6 != asoc->base.sk->sk_family)
2543 case SCTP_PARAM_IPV4_ADDRESS:
2544 /* v4 addresses are not allowed on v6-only socket */
2545 if (ipv6_only_sock(asoc->base.sk))
2548 af = sctp_get_af_specific(param_type2af(param.p->type));
2549 if (!af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0))
2551 scope = sctp_scope(peer_addr);
2552 if (sctp_in_scope(net, &addr, scope))
2553 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2557 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2558 if (!net->sctp.cookie_preserve_enable)
2561 stale = ntohl(param.life->lifespan_increment);
2563 /* Suggested Cookie Life span increment's unit is msec,
2566 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2569 case SCTP_PARAM_HOST_NAME_ADDRESS:
2570 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2573 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2574 /* Turn off the default values first so we'll know which
2575 * ones are really set by the peer.
2577 asoc->peer.ipv4_address = 0;
2578 asoc->peer.ipv6_address = 0;
2580 /* Assume that peer supports the address family
2581 * by which it sends a packet.
2583 if (peer_addr->sa.sa_family == AF_INET6)
2584 asoc->peer.ipv6_address = 1;
2585 else if (peer_addr->sa.sa_family == AF_INET)
2586 asoc->peer.ipv4_address = 1;
2588 /* Cycle through address types; avoid divide by 0. */
2589 sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2591 sat /= sizeof(__u16);
2593 for (i = 0; i < sat; ++i) {
2594 switch (param.sat->types[i]) {
2595 case SCTP_PARAM_IPV4_ADDRESS:
2596 asoc->peer.ipv4_address = 1;
2599 case SCTP_PARAM_IPV6_ADDRESS:
2600 if (PF_INET6 == asoc->base.sk->sk_family)
2601 asoc->peer.ipv6_address = 1;
2604 case SCTP_PARAM_HOST_NAME_ADDRESS:
2605 asoc->peer.hostname_address = 1;
2608 default: /* Just ignore anything else. */
2614 case SCTP_PARAM_STATE_COOKIE:
2615 asoc->peer.cookie_len =
2616 ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2617 if (asoc->peer.cookie)
2618 kfree(asoc->peer.cookie);
2619 asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp);
2620 if (!asoc->peer.cookie)
2624 case SCTP_PARAM_HEARTBEAT_INFO:
2625 /* Would be odd to receive, but it causes no problems. */
2628 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2629 /* Rejected during verify stage. */
2632 case SCTP_PARAM_ECN_CAPABLE:
2633 asoc->peer.ecn_capable = 1;
2636 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2637 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2640 case SCTP_PARAM_SET_PRIMARY:
2641 if (!net->sctp.addip_enable)
2644 addr_param = param.v + sizeof(struct sctp_addip_param);
2646 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2650 if (!af->from_addr_param(&addr, addr_param,
2651 htons(asoc->peer.port), 0))
2654 if (!af->addr_valid(&addr, NULL, NULL))
2657 t = sctp_assoc_lookup_paddr(asoc, &addr);
2661 sctp_assoc_set_primary(asoc, t);
2664 case SCTP_PARAM_SUPPORTED_EXT:
2665 sctp_process_ext_param(asoc, param);
2668 case SCTP_PARAM_FWD_TSN_SUPPORT:
2669 if (asoc->prsctp_enable) {
2670 asoc->peer.prsctp_capable = 1;
2676 case SCTP_PARAM_RANDOM:
2677 if (!ep->auth_enable)
2680 /* Save peer's random parameter */
2681 if (asoc->peer.peer_random)
2682 kfree(asoc->peer.peer_random);
2683 asoc->peer.peer_random = kmemdup(param.p,
2684 ntohs(param.p->length), gfp);
2685 if (!asoc->peer.peer_random) {
2691 case SCTP_PARAM_HMAC_ALGO:
2692 if (!ep->auth_enable)
2695 /* Save peer's HMAC list */
2696 if (asoc->peer.peer_hmacs)
2697 kfree(asoc->peer.peer_hmacs);
2698 asoc->peer.peer_hmacs = kmemdup(param.p,
2699 ntohs(param.p->length), gfp);
2700 if (!asoc->peer.peer_hmacs) {
2705 /* Set the default HMAC the peer requested*/
2706 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2709 case SCTP_PARAM_CHUNKS:
2710 if (!ep->auth_enable)
2713 if (asoc->peer.peer_chunks)
2714 kfree(asoc->peer.peer_chunks);
2715 asoc->peer.peer_chunks = kmemdup(param.p,
2716 ntohs(param.p->length), gfp);
2717 if (!asoc->peer.peer_chunks)
2722 /* Any unrecognized parameters should have been caught
2723 * and handled by sctp_verify_param() which should be
2724 * called prior to this routine. Simply log the error
2727 pr_debug("%s: ignoring param:%d for association:%p.\n",
2728 __func__, ntohs(param.p->type), asoc);
2735 /* Select a new verification tag. */
2736 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2738 /* I believe that this random number generator complies with RFC1750.
2739 * A tag of 0 is reserved for special cases (e.g. INIT).
2744 get_random_bytes(&x, sizeof(__u32));
2750 /* Select an initial TSN to send during startup. */
2751 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2755 get_random_bytes(&retval, sizeof(__u32));
2760 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2762 * 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
2763 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2764 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2765 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2767 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2768 * | Address Parameter |
2769 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2770 * | ASCONF Parameter #1 |
2771 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2775 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2776 * | ASCONF Parameter #N |
2777 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2779 * Address Parameter and other parameter will not be wrapped in this function
2781 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2782 union sctp_addr *addr,
2785 struct sctp_addiphdr asconf;
2786 struct sctp_chunk *retval;
2787 int length = sizeof(asconf) + vparam_len;
2788 union sctp_addr_param addrparam;
2790 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2792 addrlen = af->to_addr_param(addr, &addrparam);
2797 /* Create the chunk. */
2798 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2803 asconf.serial = htonl(asoc->addip_serial++);
2805 retval->subh.addip_hdr =
2806 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2807 retval->param_hdr.v =
2808 sctp_addto_chunk(retval, addrlen, &addrparam);
2814 * 3.2.1 Add IP Address
2816 * 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
2817 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2818 * | Type = 0xC001 | Length = Variable |
2819 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2820 * | ASCONF-Request Correlation ID |
2821 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2822 * | Address Parameter |
2823 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2825 * 3.2.2 Delete IP Address
2827 * 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
2828 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2829 * | Type = 0xC002 | Length = Variable |
2830 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2831 * | ASCONF-Request Correlation ID |
2832 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2833 * | Address Parameter |
2834 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2837 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2838 union sctp_addr *laddr,
2839 struct sockaddr *addrs,
2840 int addrcnt, __be16 flags)
2842 union sctp_addr_param addr_param;
2843 struct sctp_addip_param param;
2844 int paramlen = sizeof(param);
2845 struct sctp_chunk *retval;
2846 int addr_param_len = 0;
2847 union sctp_addr *addr;
2848 int totallen = 0, i;
2853 /* Get total length of all the address parameters. */
2855 for (i = 0; i < addrcnt; i++) {
2857 af = sctp_get_af_specific(addr->v4.sin_family);
2858 addr_param_len = af->to_addr_param(addr, &addr_param);
2860 totallen += paramlen;
2861 totallen += addr_param_len;
2863 addr_buf += af->sockaddr_len;
2864 if (asoc->asconf_addr_del_pending && !del_pickup) {
2865 /* reuse the parameter length from the same scope one */
2866 totallen += paramlen;
2867 totallen += addr_param_len;
2870 pr_debug("%s: picked same-scope del_pending addr, "
2871 "totallen for all addresses is %d\n",
2872 __func__, totallen);
2876 /* Create an asconf chunk with the required length. */
2877 retval = sctp_make_asconf(asoc, laddr, totallen);
2881 /* Add the address parameters to the asconf chunk. */
2883 for (i = 0; i < addrcnt; i++) {
2885 af = sctp_get_af_specific(addr->v4.sin_family);
2886 addr_param_len = af->to_addr_param(addr, &addr_param);
2887 param.param_hdr.type = flags;
2888 param.param_hdr.length = htons(paramlen + addr_param_len);
2889 param.crr_id = htonl(i);
2891 sctp_addto_chunk(retval, paramlen, ¶m);
2892 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2894 addr_buf += af->sockaddr_len;
2896 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2897 addr = asoc->asconf_addr_del_pending;
2898 af = sctp_get_af_specific(addr->v4.sin_family);
2899 addr_param_len = af->to_addr_param(addr, &addr_param);
2900 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2901 param.param_hdr.length = htons(paramlen + addr_param_len);
2902 param.crr_id = htonl(i);
2904 sctp_addto_chunk(retval, paramlen, ¶m);
2905 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2911 * 3.2.4 Set Primary IP Address
2913 * 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
2914 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2915 * | Type =0xC004 | Length = Variable |
2916 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2917 * | ASCONF-Request Correlation ID |
2918 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2919 * | Address Parameter |
2920 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2922 * Create an ASCONF chunk with Set Primary IP address parameter.
2924 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2925 union sctp_addr *addr)
2927 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2928 union sctp_addr_param addrparam;
2929 struct sctp_addip_param param;
2930 struct sctp_chunk *retval;
2931 int len = sizeof(param);
2934 addrlen = af->to_addr_param(addr, &addrparam);
2939 /* Create the chunk and make asconf header. */
2940 retval = sctp_make_asconf(asoc, addr, len);
2944 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2945 param.param_hdr.length = htons(len);
2948 sctp_addto_chunk(retval, sizeof(param), ¶m);
2949 sctp_addto_chunk(retval, addrlen, &addrparam);
2954 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2956 * 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
2957 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2958 * | Type = 0x80 | Chunk Flags | Chunk Length |
2959 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2961 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2962 * | ASCONF Parameter Response#1 |
2963 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2967 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2968 * | ASCONF Parameter Response#N |
2969 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2971 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2973 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2974 __u32 serial, int vparam_len)
2976 struct sctp_addiphdr asconf;
2977 struct sctp_chunk *retval;
2978 int length = sizeof(asconf) + vparam_len;
2980 /* Create the chunk. */
2981 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2986 asconf.serial = htonl(serial);
2988 retval->subh.addip_hdr =
2989 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2994 /* Add response parameters to an ASCONF_ACK chunk. */
2995 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2997 struct sctp_addip_param *asconf_param)
2999 struct sctp_addip_param ack_param;
3000 struct sctp_errhdr err_param;
3001 int asconf_param_len = 0;
3002 int err_param_len = 0;
3003 __be16 response_type;
3005 if (SCTP_ERROR_NO_ERROR == err_code) {
3006 response_type = SCTP_PARAM_SUCCESS_REPORT;
3008 response_type = SCTP_PARAM_ERR_CAUSE;
3009 err_param_len = sizeof(err_param);
3012 ntohs(asconf_param->param_hdr.length);
3015 /* Add Success Indication or Error Cause Indication parameter. */
3016 ack_param.param_hdr.type = response_type;
3017 ack_param.param_hdr.length = htons(sizeof(ack_param) +
3020 ack_param.crr_id = crr_id;
3021 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
3023 if (SCTP_ERROR_NO_ERROR == err_code)
3026 /* Add Error Cause parameter. */
3027 err_param.cause = err_code;
3028 err_param.length = htons(err_param_len + asconf_param_len);
3029 sctp_addto_chunk(chunk, err_param_len, &err_param);
3031 /* Add the failed TLV copied from ASCONF chunk. */
3033 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3036 /* Process a asconf parameter. */
3037 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3038 struct sctp_chunk *asconf,
3039 struct sctp_addip_param *asconf_param)
3041 union sctp_addr_param *addr_param;
3042 struct sctp_transport *peer;
3043 union sctp_addr addr;
3046 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3048 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3049 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3050 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3051 return SCTP_ERROR_UNKNOWN_PARAM;
3053 switch (addr_param->p.type) {
3054 case SCTP_PARAM_IPV6_ADDRESS:
3055 if (!asoc->peer.ipv6_address)
3056 return SCTP_ERROR_DNS_FAILED;
3058 case SCTP_PARAM_IPV4_ADDRESS:
3059 if (!asoc->peer.ipv4_address)
3060 return SCTP_ERROR_DNS_FAILED;
3063 return SCTP_ERROR_DNS_FAILED;
3066 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3068 return SCTP_ERROR_DNS_FAILED;
3070 if (!af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0))
3071 return SCTP_ERROR_DNS_FAILED;
3073 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3074 * or multicast address.
3075 * (note: wildcard is permitted and requires special handling so
3076 * make sure we check for that)
3078 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3079 return SCTP_ERROR_DNS_FAILED;
3081 switch (asconf_param->param_hdr.type) {
3082 case SCTP_PARAM_ADD_IP:
3084 * If the address 0.0.0.0 or ::0 is provided, the source
3085 * address of the packet MUST be added.
3087 if (af->is_any(&addr))
3088 memcpy(&addr, &asconf->source, sizeof(addr));
3090 if (security_sctp_bind_connect(asoc->ep->base.sk,
3092 (struct sockaddr *)&addr,
3094 return SCTP_ERROR_REQ_REFUSED;
3096 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3097 * request and does not have the local resources to add this
3098 * new address to the association, it MUST return an Error
3099 * Cause TLV set to the new error code 'Operation Refused
3100 * Due to Resource Shortage'.
3103 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3105 return SCTP_ERROR_RSRC_LOW;
3107 /* Start the heartbeat timer. */
3108 sctp_transport_reset_hb_timer(peer);
3109 asoc->new_transport = peer;
3111 case SCTP_PARAM_DEL_IP:
3112 /* ADDIP 4.3 D7) If a request is received to delete the
3113 * last remaining IP address of a peer endpoint, the receiver
3114 * MUST send an Error Cause TLV with the error cause set to the
3115 * new error code 'Request to Delete Last Remaining IP Address'.
3117 if (asoc->peer.transport_count == 1)
3118 return SCTP_ERROR_DEL_LAST_IP;
3120 /* ADDIP 4.3 D8) If a request is received to delete an IP
3121 * address which is also the source address of the IP packet
3122 * which contained the ASCONF chunk, the receiver MUST reject
3123 * this request. To reject the request the receiver MUST send
3124 * an Error Cause TLV set to the new error code 'Request to
3125 * Delete Source IP Address'
3127 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3128 return SCTP_ERROR_DEL_SRC_IP;
3131 * If the address 0.0.0.0 or ::0 is provided, all
3132 * addresses of the peer except the source address of the
3133 * packet MUST be deleted.
3135 if (af->is_any(&addr)) {
3136 sctp_assoc_set_primary(asoc, asconf->transport);
3137 sctp_assoc_del_nonprimary_peers(asoc,
3139 return SCTP_ERROR_NO_ERROR;
3142 /* If the address is not part of the association, the
3143 * ASCONF-ACK with Error Cause Indication Parameter
3144 * which including cause of Unresolvable Address should
3147 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3149 return SCTP_ERROR_DNS_FAILED;
3151 sctp_assoc_rm_peer(asoc, peer);
3153 case SCTP_PARAM_SET_PRIMARY:
3154 /* ADDIP Section 4.2.4
3155 * If the address 0.0.0.0 or ::0 is provided, the receiver
3156 * MAY mark the source address of the packet as its
3159 if (af->is_any(&addr))
3160 memcpy(&addr, sctp_source(asconf), sizeof(addr));
3162 if (security_sctp_bind_connect(asoc->ep->base.sk,
3163 SCTP_PARAM_SET_PRIMARY,
3164 (struct sockaddr *)&addr,
3166 return SCTP_ERROR_REQ_REFUSED;
3168 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3170 return SCTP_ERROR_DNS_FAILED;
3172 sctp_assoc_set_primary(asoc, peer);
3176 return SCTP_ERROR_NO_ERROR;
3179 /* Verify the ASCONF packet before we process it. */
3180 bool sctp_verify_asconf(const struct sctp_association *asoc,
3181 struct sctp_chunk *chunk, bool addr_param_needed,
3182 struct sctp_paramhdr **errp)
3184 struct sctp_addip_chunk *addip;
3185 bool addr_param_seen = false;
3186 union sctp_params param;
3188 addip = (struct sctp_addip_chunk *)chunk->chunk_hdr;
3189 sctp_walk_params(param, addip, addip_hdr.params) {
3190 size_t length = ntohs(param.p->length);
3193 switch (param.p->type) {
3194 case SCTP_PARAM_ERR_CAUSE:
3196 case SCTP_PARAM_IPV4_ADDRESS:
3197 if (length != sizeof(struct sctp_ipv4addr_param))
3199 /* ensure there is only one addr param and it's in the
3200 * beginning of addip_hdr params, or we reject it.
3202 if (param.v != addip->addip_hdr.params)
3204 addr_param_seen = true;
3206 case SCTP_PARAM_IPV6_ADDRESS:
3207 if (length != sizeof(struct sctp_ipv6addr_param))
3209 if (param.v != addip->addip_hdr.params)
3211 addr_param_seen = true;
3213 case SCTP_PARAM_ADD_IP:
3214 case SCTP_PARAM_DEL_IP:
3215 case SCTP_PARAM_SET_PRIMARY:
3216 /* In ASCONF chunks, these need to be first. */
3217 if (addr_param_needed && !addr_param_seen)
3219 length = ntohs(param.addip->param_hdr.length);
3220 if (length < sizeof(struct sctp_addip_param) +
3224 case SCTP_PARAM_SUCCESS_REPORT:
3225 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3226 if (length != sizeof(struct sctp_addip_param))
3230 /* This is unkown to us, reject! */
3235 /* Remaining sanity checks. */
3236 if (addr_param_needed && !addr_param_seen)
3238 if (!addr_param_needed && addr_param_seen)
3240 if (param.v != chunk->chunk_end)
3246 /* Process an incoming ASCONF chunk with the next expected serial no. and
3247 * return an ASCONF_ACK chunk to be sent in response.
3249 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3250 struct sctp_chunk *asconf)
3252 union sctp_addr_param *addr_param;
3253 struct sctp_addip_chunk *addip;
3254 struct sctp_chunk *asconf_ack;
3255 bool all_param_pass = true;
3256 struct sctp_addiphdr *hdr;
3257 int length = 0, chunk_len;
3258 union sctp_params param;
3262 addip = (struct sctp_addip_chunk *)asconf->chunk_hdr;
3263 chunk_len = ntohs(asconf->chunk_hdr->length) -
3264 sizeof(struct sctp_chunkhdr);
3265 hdr = (struct sctp_addiphdr *)asconf->skb->data;
3266 serial = ntohl(hdr->serial);
3268 /* Skip the addiphdr and store a pointer to address parameter. */
3269 length = sizeof(*hdr);
3270 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3271 chunk_len -= length;
3273 /* Skip the address parameter and store a pointer to the first
3276 length = ntohs(addr_param->p.length);
3277 chunk_len -= length;
3279 /* create an ASCONF_ACK chunk.
3280 * Based on the definitions of parameters, we know that the size of
3281 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3284 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3288 /* Process the TLVs contained within the ASCONF chunk. */
3289 sctp_walk_params(param, addip, addip_hdr.params) {
3290 /* Skip preceeding address parameters. */
3291 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3292 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3295 err_code = sctp_process_asconf_param(asoc, asconf,
3298 * If an error response is received for a TLV parameter,
3299 * all TLVs with no response before the failed TLV are
3300 * considered successful if not reported. All TLVs after
3301 * the failed response are considered unsuccessful unless
3302 * a specific success indication is present for the parameter.
3304 if (err_code != SCTP_ERROR_NO_ERROR)
3305 all_param_pass = false;
3306 if (!all_param_pass)
3307 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3308 err_code, param.addip);
3310 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3311 * an IP address sends an 'Out of Resource' in its response, it
3312 * MUST also fail any subsequent add or delete requests bundled
3315 if (err_code == SCTP_ERROR_RSRC_LOW)
3319 asoc->peer.addip_serial++;
3321 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3322 * after freeing the reference to old asconf ack if any.
3325 sctp_chunk_hold(asconf_ack);
3326 list_add_tail(&asconf_ack->transmitted_list,
3327 &asoc->asconf_ack_list);
3333 /* Process a asconf parameter that is successfully acked. */
3334 static void sctp_asconf_param_success(struct sctp_association *asoc,
3335 struct sctp_addip_param *asconf_param)
3337 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3338 union sctp_addr_param *addr_param;
3339 struct sctp_sockaddr_entry *saddr;
3340 struct sctp_transport *transport;
3341 union sctp_addr addr;
3344 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3346 /* We have checked the packet before, so we do not check again. */
3347 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3348 if (!af->from_addr_param(&addr, addr_param, htons(bp->port), 0))
3351 switch (asconf_param->param_hdr.type) {
3352 case SCTP_PARAM_ADD_IP:
3353 /* This is always done in BH context with a socket lock
3354 * held, so the list can not change.
3357 list_for_each_entry(saddr, &bp->address_list, list) {
3358 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3359 saddr->state = SCTP_ADDR_SRC;
3362 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3364 sctp_transport_dst_release(transport);
3367 case SCTP_PARAM_DEL_IP:
3369 sctp_del_bind_addr(bp, &addr);
3370 if (asoc->asconf_addr_del_pending != NULL &&
3371 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3372 kfree(asoc->asconf_addr_del_pending);
3373 asoc->asconf_addr_del_pending = NULL;
3376 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3378 sctp_transport_dst_release(transport);
3386 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3387 * for the given asconf parameter. If there is no response for this parameter,
3388 * return the error code based on the third argument 'no_err'.
3390 * A7) If an error response is received for a TLV parameter, all TLVs with no
3391 * response before the failed TLV are considered successful if not reported.
3392 * All TLVs after the failed response are considered unsuccessful unless a
3393 * specific success indication is present for the parameter.
3395 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3396 struct sctp_addip_param *asconf_param,
3399 struct sctp_addip_param *asconf_ack_param;
3400 struct sctp_errhdr *err_param;
3406 err_code = SCTP_ERROR_NO_ERROR;
3408 err_code = SCTP_ERROR_REQ_REFUSED;
3410 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3411 sizeof(struct sctp_chunkhdr);
3413 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3414 * the first asconf_ack parameter.
3416 length = sizeof(struct sctp_addiphdr);
3417 asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data +
3419 asconf_ack_len -= length;
3421 while (asconf_ack_len > 0) {
3422 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3423 switch (asconf_ack_param->param_hdr.type) {
3424 case SCTP_PARAM_SUCCESS_REPORT:
3425 return SCTP_ERROR_NO_ERROR;
3426 case SCTP_PARAM_ERR_CAUSE:
3427 length = sizeof(*asconf_ack_param);
3428 err_param = (void *)asconf_ack_param + length;
3429 asconf_ack_len -= length;
3430 if (asconf_ack_len > 0)
3431 return err_param->cause;
3433 return SCTP_ERROR_INV_PARAM;
3436 return SCTP_ERROR_INV_PARAM;
3440 length = ntohs(asconf_ack_param->param_hdr.length);
3441 asconf_ack_param = (void *)asconf_ack_param + length;
3442 asconf_ack_len -= length;
3448 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3449 int sctp_process_asconf_ack(struct sctp_association *asoc,
3450 struct sctp_chunk *asconf_ack)
3452 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3453 struct sctp_addip_param *asconf_param;
3454 __be16 err_code = SCTP_ERROR_NO_ERROR;
3455 union sctp_addr_param *addr_param;
3456 int asconf_len = asconf->skb->len;
3457 int all_param_pass = 0;
3462 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3463 * a pointer to address parameter.
3465 length = sizeof(struct sctp_addip_chunk);
3466 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3467 asconf_len -= length;
3469 /* Skip the address parameter in the last asconf sent and store a
3470 * pointer to the first asconf parameter.
3472 length = ntohs(addr_param->p.length);
3473 asconf_param = (void *)addr_param + length;
3474 asconf_len -= length;
3477 * A8) If there is no response(s) to specific TLV parameter(s), and no
3478 * failures are indicated, then all request(s) are considered
3481 if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr))
3484 /* Process the TLVs contained in the last sent ASCONF chunk. */
3485 while (asconf_len > 0) {
3487 err_code = SCTP_ERROR_NO_ERROR;
3489 err_code = sctp_get_asconf_response(asconf_ack,
3492 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3497 case SCTP_ERROR_NO_ERROR:
3498 sctp_asconf_param_success(asoc, asconf_param);
3501 case SCTP_ERROR_RSRC_LOW:
3505 case SCTP_ERROR_UNKNOWN_PARAM:
3506 /* Disable sending this type of asconf parameter in
3509 asoc->peer.addip_disabled_mask |=
3510 asconf_param->param_hdr.type;
3513 case SCTP_ERROR_REQ_REFUSED:
3514 case SCTP_ERROR_DEL_LAST_IP:
3515 case SCTP_ERROR_DEL_SRC_IP:
3520 /* Skip the processed asconf parameter and move to the next
3523 length = ntohs(asconf_param->param_hdr.length);
3524 asconf_param = (void *)asconf_param + length;
3525 asconf_len -= length;
3528 if (no_err && asoc->src_out_of_asoc_ok) {
3529 asoc->src_out_of_asoc_ok = 0;
3530 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3533 /* Free the cached last sent asconf chunk. */
3534 list_del_init(&asconf->transmitted_list);
3535 sctp_chunk_free(asconf);
3536 asoc->addip_last_asconf = NULL;
3541 /* Make a FWD TSN chunk. */
3542 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3543 __u32 new_cum_tsn, size_t nstreams,
3544 struct sctp_fwdtsn_skip *skiplist)
3546 struct sctp_chunk *retval = NULL;
3547 struct sctp_fwdtsn_hdr ftsn_hdr;
3548 struct sctp_fwdtsn_skip skip;
3552 hint = (nstreams + 1) * sizeof(__u32);
3554 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3559 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3560 retval->subh.fwdtsn_hdr =
3561 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3563 for (i = 0; i < nstreams; i++) {
3564 skip.stream = skiplist[i].stream;
3565 skip.ssn = skiplist[i].ssn;
3566 sctp_addto_chunk(retval, sizeof(skip), &skip);
3572 struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
3573 __u32 new_cum_tsn, size_t nstreams,
3574 struct sctp_ifwdtsn_skip *skiplist)
3576 struct sctp_chunk *retval = NULL;
3577 struct sctp_ifwdtsn_hdr ftsn_hdr;
3580 hint = (nstreams + 1) * sizeof(__u32);
3582 retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint,
3587 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3588 retval->subh.ifwdtsn_hdr =
3589 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3591 sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist);
3596 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3598 * 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
3599 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3600 * | Type = 130 | Chunk Flags | Chunk Length |
3601 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3603 * / Re-configuration Parameter /
3605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3607 * / Re-configuration Parameter (optional) /
3609 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3611 static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc,
3614 struct sctp_reconf_chunk *reconf;
3615 struct sctp_chunk *retval;
3617 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3622 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3623 retval->param_hdr.v = reconf->params;
3628 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3630 * 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
3631 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3632 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3633 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3634 * | Re-configuration Request Sequence Number |
3635 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3636 * | Re-configuration Response Sequence Number |
3637 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3638 * | Sender's Last Assigned TSN |
3639 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3640 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3641 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3643 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3644 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3645 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3647 * RE-CONFIG 4.2 (STREAM IN RESET)
3649 * 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
3650 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3651 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3652 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3653 * | Re-configuration Request Sequence Number |
3654 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3655 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3656 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3659 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3662 struct sctp_chunk *sctp_make_strreset_req(
3663 const struct sctp_association *asoc,
3664 __u16 stream_num, __be16 *stream_list,
3667 __u16 stream_len = stream_num * sizeof(__u16);
3668 struct sctp_strreset_outreq outreq;
3669 struct sctp_strreset_inreq inreq;
3670 struct sctp_chunk *retval;
3671 __u16 outlen, inlen;
3673 outlen = (sizeof(outreq) + stream_len) * out;
3674 inlen = (sizeof(inreq) + stream_len) * in;
3676 retval = sctp_make_reconf(asoc, SCTP_PAD4(outlen) + SCTP_PAD4(inlen));
3681 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3682 outreq.param_hdr.length = htons(outlen);
3683 outreq.request_seq = htonl(asoc->strreset_outseq);
3684 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3685 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3687 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3690 sctp_addto_chunk(retval, stream_len, stream_list);
3694 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3695 inreq.param_hdr.length = htons(inlen);
3696 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3698 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3701 sctp_addto_chunk(retval, stream_len, stream_list);
3707 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3709 * 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
3710 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3711 * | Parameter Type = 15 | Parameter Length = 8 |
3712 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3713 * | Re-configuration Request Sequence Number |
3714 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3716 struct sctp_chunk *sctp_make_strreset_tsnreq(
3717 const struct sctp_association *asoc)
3719 struct sctp_strreset_tsnreq tsnreq;
3720 __u16 length = sizeof(tsnreq);
3721 struct sctp_chunk *retval;
3723 retval = sctp_make_reconf(asoc, length);
3727 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3728 tsnreq.param_hdr.length = htons(length);
3729 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3731 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3736 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3738 * 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
3739 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3740 * | Parameter Type = 17 | Parameter Length = 12 |
3741 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3742 * | Re-configuration Request Sequence Number |
3743 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3744 * | Number of new streams | Reserved |
3745 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3747 struct sctp_chunk *sctp_make_strreset_addstrm(
3748 const struct sctp_association *asoc,
3749 __u16 out, __u16 in)
3751 struct sctp_strreset_addstrm addstrm;
3752 __u16 size = sizeof(addstrm);
3753 struct sctp_chunk *retval;
3755 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3760 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3761 addstrm.param_hdr.length = htons(size);
3762 addstrm.number_of_streams = htons(out);
3763 addstrm.request_seq = htonl(asoc->strreset_outseq);
3764 addstrm.reserved = 0;
3766 sctp_addto_chunk(retval, size, &addstrm);
3770 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3771 addstrm.param_hdr.length = htons(size);
3772 addstrm.number_of_streams = htons(in);
3773 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3774 addstrm.reserved = 0;
3776 sctp_addto_chunk(retval, size, &addstrm);
3782 /* RE-CONFIG 4.4 (RESP)
3784 * 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
3785 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3786 * | Parameter Type = 16 | Parameter Length |
3787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3788 * | Re-configuration Response Sequence Number |
3789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3791 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3793 struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
3794 __u32 result, __u32 sn)
3796 struct sctp_strreset_resp resp;
3797 __u16 length = sizeof(resp);
3798 struct sctp_chunk *retval;
3800 retval = sctp_make_reconf(asoc, length);
3804 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3805 resp.param_hdr.length = htons(length);
3806 resp.response_seq = htonl(sn);
3807 resp.result = htonl(result);
3809 sctp_addto_chunk(retval, sizeof(resp), &resp);
3814 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3816 * 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
3817 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3818 * | Parameter Type = 16 | Parameter Length |
3819 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3820 * | Re-configuration Response Sequence Number |
3821 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3823 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3824 * | Sender's Next TSN (optional) |
3825 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3826 * | Receiver's Next TSN (optional) |
3827 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3829 struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
3830 __u32 result, __u32 sn,
3834 struct sctp_strreset_resptsn tsnresp;
3835 __u16 length = sizeof(tsnresp);
3836 struct sctp_chunk *retval;
3838 retval = sctp_make_reconf(asoc, length);
3842 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3843 tsnresp.param_hdr.length = htons(length);
3845 tsnresp.response_seq = htonl(sn);
3846 tsnresp.result = htonl(result);
3847 tsnresp.senders_next_tsn = htonl(sender_tsn);
3848 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3850 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3855 bool sctp_verify_reconf(const struct sctp_association *asoc,
3856 struct sctp_chunk *chunk,
3857 struct sctp_paramhdr **errp)
3859 struct sctp_reconf_chunk *hdr;
3860 union sctp_params param;
3864 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3865 sctp_walk_params(param, hdr, params) {
3866 __u16 length = ntohs(param.p->length);
3871 switch (param.p->type) {
3872 case SCTP_PARAM_RESET_OUT_REQUEST:
3873 if (length < sizeof(struct sctp_strreset_outreq) ||
3874 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3875 last != SCTP_PARAM_RESET_IN_REQUEST))
3878 case SCTP_PARAM_RESET_IN_REQUEST:
3879 if (length < sizeof(struct sctp_strreset_inreq) ||
3880 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3883 case SCTP_PARAM_RESET_RESPONSE:
3884 if ((length != sizeof(struct sctp_strreset_resp) &&
3885 length != sizeof(struct sctp_strreset_resptsn)) ||
3886 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3887 last != SCTP_PARAM_RESET_OUT_REQUEST))
3890 case SCTP_PARAM_RESET_TSN_REQUEST:
3892 sizeof(struct sctp_strreset_tsnreq) || last)
3895 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3896 if (length != sizeof(struct sctp_strreset_addstrm) ||
3897 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3900 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3901 if (length != sizeof(struct sctp_strreset_addstrm) ||
3902 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3909 last = param.p->type;