1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2002 Intel Corp.
7 * This file is part of the SCTP kernel implementation
9 * These functions work with the state functions in sctp_sm_statefuns.c
10 * to implement the state operations. These functions implement the
11 * steps which require modifying existing data structures.
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <linux-sctp@vger.kernel.org>
33 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * C. Robin <chris@hundredacre.ac.uk>
37 * Jon Grimm <jgrimm@us.ibm.com>
38 * Xingang Guo <xingang.guo@intel.com>
39 * Dajiang Zhang <dajiang.zhang@nokia.com>
40 * Sridhar Samudrala <sri@us.ibm.com>
41 * Daisy Chang <daisyc@us.ibm.com>
42 * Ardelle Fan <ardelle.fan@intel.com>
43 * Kevin Gao <kevin.gao@intel.com>
46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48 #include <crypto/hash.h>
49 #include <linux/types.h>
50 #include <linux/kernel.h>
52 #include <linux/ipv6.h>
53 #include <linux/net.h>
54 #include <linux/inet.h>
55 #include <linux/scatterlist.h>
56 #include <linux/slab.h>
59 #include <linux/skbuff.h>
60 #include <linux/random.h> /* for get_random_bytes */
61 #include <net/sctp/sctp.h>
62 #include <net/sctp/sm.h>
64 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
65 __u8 type, __u8 flags, int paylen,
67 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
68 __u8 flags, int paylen, gfp_t gfp);
69 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
70 __u8 type, __u8 flags, int paylen,
72 static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
73 const struct sctp_association *asoc,
74 const struct sctp_chunk *init_chunk,
76 const __u8 *raw_addrs, int addrs_len);
77 static int sctp_process_param(struct sctp_association *asoc,
78 union sctp_params param,
79 const union sctp_addr *peer_addr,
81 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
83 static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len,
86 /* Control chunk destructor */
87 static void sctp_control_release_owner(struct sk_buff *skb)
89 /*TODO: do memory release */
92 static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
94 struct sctp_association *asoc = chunk->asoc;
95 struct sk_buff *skb = chunk->skb;
97 /* TODO: properly account for control chunks.
98 * To do it right we'll need:
99 * 1) endpoint if association isn't known.
100 * 2) proper memory accounting.
102 * For now don't do anything for now.
104 skb->sk = asoc ? asoc->base.sk : NULL;
105 skb->destructor = sctp_control_release_owner;
108 /* What was the inbound interface for this chunk? */
109 int sctp_chunk_iif(const struct sctp_chunk *chunk)
111 struct sk_buff *skb = chunk->skb;
113 return SCTP_INPUT_CB(skb)->af->skb_iif(skb);
116 /* RFC 2960 3.3.2 Initiation (INIT) (1)
118 * Note 2: The ECN capable field is reserved for future use of
119 * Explicit Congestion Notification.
121 static const struct sctp_paramhdr ecap_param = {
122 SCTP_PARAM_ECN_CAPABLE,
123 cpu_to_be16(sizeof(struct sctp_paramhdr)),
125 static const struct sctp_paramhdr prsctp_param = {
126 SCTP_PARAM_FWD_TSN_SUPPORT,
127 cpu_to_be16(sizeof(struct sctp_paramhdr)),
130 /* A helper to initialize an op error inside a
131 * provided chunk, as most cause codes will be embedded inside an
134 void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
140 /* Cause code constants are now defined in network order. */
141 err.cause = cause_code;
142 len = sizeof(sctp_errhdr_t) + paylen;
143 err.length = htons(len);
144 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
147 /* A helper to initialize an op error inside a
148 * provided chunk, as most cause codes will be embedded inside an
149 * abort chunk. Differs from sctp_init_cause in that it won't oops
150 * if there isn't enough space in the op error chunk
152 static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
158 /* Cause code constants are now defined in network order. */
159 err.cause = cause_code;
160 len = sizeof(sctp_errhdr_t) + paylen;
161 err.length = htons(len);
163 if (skb_tailroom(chunk->skb) < len)
165 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
166 sizeof(sctp_errhdr_t),
170 /* 3.3.2 Initiation (INIT) (1)
172 * This chunk is used to initiate a SCTP association between two
173 * endpoints. The format of the INIT chunk is shown below:
176 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
178 * | Type = 1 | Chunk Flags | Chunk Length |
179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
181 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
182 * | Advertised Receiver Window Credit (a_rwnd) |
183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
184 * | Number of Outbound Streams | Number of Inbound Streams |
185 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
187 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
189 * / Optional/Variable-Length Parameters /
191 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
194 * The INIT chunk contains the following parameters. Unless otherwise
195 * noted, each parameter MUST only be included once in the INIT chunk.
197 * Fixed Parameters Status
198 * ----------------------------------------------
199 * Initiate Tag Mandatory
200 * Advertised Receiver Window Credit Mandatory
201 * Number of Outbound Streams Mandatory
202 * Number of Inbound Streams Mandatory
203 * Initial TSN Mandatory
205 * Variable Parameters Status Type Value
206 * -------------------------------------------------------------
207 * IPv4 Address (Note 1) Optional 5
208 * IPv6 Address (Note 1) Optional 6
209 * Cookie Preservative Optional 9
210 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
211 * Host Name Address (Note 3) Optional 11
212 * Supported Address Types (Note 4) Optional 12
214 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
215 const struct sctp_bind_addr *bp,
216 gfp_t gfp, int vparam_len)
218 struct net *net = sock_net(asoc->base.sk);
219 struct sctp_endpoint *ep = asoc->ep;
221 union sctp_params addrs;
223 struct sctp_chunk *retval = NULL;
224 int num_types, addrs_len = 0;
225 struct sctp_sock *sp;
226 sctp_supported_addrs_param_t sat;
228 sctp_adaptation_ind_param_t aiparam;
229 sctp_supported_ext_param_t ext_param;
232 sctp_paramhdr_t *auth_chunks = NULL,
235 /* RFC 2960 3.3.2 Initiation (INIT) (1)
237 * Note 1: The INIT chunks can contain multiple addresses that
238 * can be IPv4 and/or IPv6 in any combination.
242 /* Convert the provided bind address list to raw format. */
243 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
245 init.init_tag = htonl(asoc->c.my_vtag);
246 init.a_rwnd = htonl(asoc->rwnd);
247 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
248 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
249 init.initial_tsn = htonl(asoc->c.initial_tsn);
251 /* How many address types are needed? */
252 sp = sctp_sk(asoc->base.sk);
253 num_types = sp->pf->supported_addrs(sp, types);
255 chunksize = sizeof(init) + addrs_len;
256 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
257 chunksize += sizeof(ecap_param);
259 if (asoc->prsctp_enable)
260 chunksize += sizeof(prsctp_param);
262 /* ADDIP: Section 4.2.7:
263 * An implementation supporting this extension [ADDIP] MUST list
264 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
265 * INIT-ACK parameters.
267 if (net->sctp.addip_enable) {
268 extensions[num_ext] = SCTP_CID_ASCONF;
269 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
273 if (asoc->reconf_enable) {
274 extensions[num_ext] = SCTP_CID_RECONF;
278 if (sp->adaptation_ind)
279 chunksize += sizeof(aiparam);
281 chunksize += vparam_len;
283 /* Account for AUTH related parameters */
284 if (ep->auth_enable) {
285 /* Add random parameter length*/
286 chunksize += sizeof(asoc->c.auth_random);
288 /* Add HMACS parameter length if any were defined */
289 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
290 if (auth_hmacs->length)
291 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
295 /* Add CHUNKS parameter length */
296 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
297 if (auth_chunks->length)
298 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
302 extensions[num_ext] = SCTP_CID_AUTH;
306 /* If we have any extensions to report, account for that */
308 chunksize += SCTP_PAD4(sizeof(sctp_supported_ext_param_t) +
311 /* RFC 2960 3.3.2 Initiation (INIT) (1)
313 * Note 3: An INIT chunk MUST NOT contain more than one Host
314 * Name address parameter. Moreover, the sender of the INIT
315 * MUST NOT combine any other address types with the Host Name
316 * address in the INIT. The receiver of INIT MUST ignore any
317 * other address types if the Host Name address parameter is
318 * present in the received INIT chunk.
320 * PLEASE DO NOT FIXME [This version does not support Host Name.]
323 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
327 retval->subh.init_hdr =
328 sctp_addto_chunk(retval, sizeof(init), &init);
329 retval->param_hdr.v =
330 sctp_addto_chunk(retval, addrs_len, addrs.v);
332 /* RFC 2960 3.3.2 Initiation (INIT) (1)
334 * Note 4: This parameter, when present, specifies all the
335 * address types the sending endpoint can support. The absence
336 * of this parameter indicates that the sending endpoint can
337 * support any address type.
339 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
340 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
341 sctp_addto_chunk(retval, sizeof(sat), &sat);
342 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
344 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
346 /* Add the supported extensions parameter. Be nice and add this
347 * fist before addiding the parameters for the extensions themselves
350 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
351 ext_param.param_hdr.length =
352 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
353 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
355 sctp_addto_param(retval, num_ext, extensions);
358 if (asoc->prsctp_enable)
359 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
361 if (sp->adaptation_ind) {
362 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
363 aiparam.param_hdr.length = htons(sizeof(aiparam));
364 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
365 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
368 /* Add SCTP-AUTH chunks to the parameter list */
369 if (ep->auth_enable) {
370 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
371 asoc->c.auth_random);
373 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
376 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
384 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
385 const struct sctp_chunk *chunk,
386 gfp_t gfp, int unkparam_len)
388 sctp_inithdr_t initack;
389 struct sctp_chunk *retval;
390 union sctp_params addrs;
391 struct sctp_sock *sp;
393 sctp_cookie_param_t *cookie;
396 sctp_adaptation_ind_param_t aiparam;
397 sctp_supported_ext_param_t ext_param;
400 sctp_paramhdr_t *auth_chunks = NULL,
406 /* Note: there may be no addresses to embed. */
407 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
409 initack.init_tag = htonl(asoc->c.my_vtag);
410 initack.a_rwnd = htonl(asoc->rwnd);
411 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
412 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
413 initack.initial_tsn = htonl(asoc->c.initial_tsn);
415 /* FIXME: We really ought to build the cookie right
416 * into the packet instead of allocating more fresh memory.
418 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
423 /* Calculate the total size of allocation, include the reserved
424 * space for reporting unknown parameters if it is specified.
426 sp = sctp_sk(asoc->base.sk);
427 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
429 /* Tell peer that we'll do ECN only if peer advertised such cap. */
430 if (asoc->peer.ecn_capable)
431 chunksize += sizeof(ecap_param);
433 if (asoc->peer.prsctp_capable)
434 chunksize += sizeof(prsctp_param);
436 if (asoc->peer.asconf_capable) {
437 extensions[num_ext] = SCTP_CID_ASCONF;
438 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
442 if (asoc->peer.reconf_capable) {
443 extensions[num_ext] = SCTP_CID_RECONF;
447 if (sp->adaptation_ind)
448 chunksize += sizeof(aiparam);
450 if (asoc->peer.auth_capable) {
451 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
452 chunksize += ntohs(auth_random->length);
454 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
455 if (auth_hmacs->length)
456 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
460 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
461 if (auth_chunks->length)
462 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
466 extensions[num_ext] = SCTP_CID_AUTH;
471 chunksize += SCTP_PAD4(sizeof(sctp_supported_ext_param_t) +
474 /* Now allocate and fill out the chunk. */
475 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
479 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
481 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
482 * HEARTBEAT ACK, * etc.) to the same destination transport
483 * address from which it received the DATA or control chunk
484 * to which it is replying.
486 * [INIT ACK back to where the INIT came from.]
488 retval->transport = chunk->transport;
490 retval->subh.init_hdr =
491 sctp_addto_chunk(retval, sizeof(initack), &initack);
492 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
493 sctp_addto_chunk(retval, cookie_len, cookie);
494 if (asoc->peer.ecn_capable)
495 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
497 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
498 ext_param.param_hdr.length =
499 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
500 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
502 sctp_addto_param(retval, num_ext, extensions);
504 if (asoc->peer.prsctp_capable)
505 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
507 if (sp->adaptation_ind) {
508 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
509 aiparam.param_hdr.length = htons(sizeof(aiparam));
510 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
511 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
514 if (asoc->peer.auth_capable) {
515 sctp_addto_chunk(retval, ntohs(auth_random->length),
518 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
521 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
525 /* We need to remove the const qualifier at this point. */
526 retval->asoc = (struct sctp_association *) asoc;
535 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
537 * This chunk is used only during the initialization of an association.
538 * It is sent by the initiator of an association to its peer to complete
539 * the initialization process. This chunk MUST precede any DATA chunk
540 * sent within the association, but MAY be bundled with one or more DATA
541 * chunks in the same packet.
544 * 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
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * | Type = 10 |Chunk Flags | Length |
547 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
554 * Set to zero on transmit and ignored on receipt.
556 * Length: 16 bits (unsigned integer)
558 * Set to the size of the chunk in bytes, including the 4 bytes of
559 * the chunk header and the size of the Cookie.
561 * Cookie: variable size
563 * This field must contain the exact cookie received in the
564 * State Cookie parameter from the previous INIT ACK.
566 * An implementation SHOULD make the cookie as small as possible
567 * to insure interoperability.
569 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
570 const struct sctp_chunk *chunk)
572 struct sctp_chunk *retval;
576 cookie = asoc->peer.cookie;
577 cookie_len = asoc->peer.cookie_len;
579 /* Build a cookie echo chunk. */
580 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
581 cookie_len, GFP_ATOMIC);
584 retval->subh.cookie_hdr =
585 sctp_addto_chunk(retval, cookie_len, cookie);
587 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
589 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
590 * HEARTBEAT ACK, * etc.) to the same destination transport
591 * address from which it * received the DATA or control chunk
592 * to which it is replying.
594 * [COOKIE ECHO back to where the INIT ACK came from.]
597 retval->transport = chunk->transport;
603 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
605 * This chunk is used only during the initialization of an
606 * association. It is used to acknowledge the receipt of a COOKIE
607 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
608 * within the association, but MAY be bundled with one or more DATA
609 * chunks or SACK chunk in the same SCTP packet.
612 * 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
613 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
614 * | Type = 11 |Chunk Flags | Length = 4 |
615 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
617 * Chunk Flags: 8 bits
619 * Set to zero on transmit and ignored on receipt.
621 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
622 const struct sctp_chunk *chunk)
624 struct sctp_chunk *retval;
626 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
628 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
630 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
631 * HEARTBEAT ACK, * etc.) to the same destination transport
632 * address from which it * received the DATA or control chunk
633 * to which it is replying.
635 * [COOKIE ACK back to where the COOKIE ECHO came from.]
638 retval->transport = chunk->transport;
644 * Appendix A: Explicit Congestion Notification:
647 * RFC 2481 details a specific bit for a sender to send in the header of
648 * its next outbound TCP segment to indicate to its peer that it has
649 * reduced its congestion window. This is termed the CWR bit. For
650 * SCTP the same indication is made by including the CWR chunk.
651 * This chunk contains one data element, i.e. the TSN number that
652 * was sent in the ECNE chunk. This element represents the lowest
653 * TSN number in the datagram that was originally marked with the
657 * 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
658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
661 * | Lowest TSN Number |
662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
664 * Note: The CWR is considered a Control chunk.
666 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
667 const __u32 lowest_tsn,
668 const struct sctp_chunk *chunk)
670 struct sctp_chunk *retval;
673 cwr.lowest_tsn = htonl(lowest_tsn);
674 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
675 sizeof(sctp_cwrhdr_t), GFP_ATOMIC);
680 retval->subh.ecn_cwr_hdr =
681 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
683 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
685 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
686 * HEARTBEAT ACK, * etc.) to the same destination transport
687 * address from which it * received the DATA or control chunk
688 * to which it is replying.
690 * [Report a reduced congestion window back to where the ECNE
694 retval->transport = chunk->transport;
700 /* Make an ECNE chunk. This is a congestion experienced report. */
701 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
702 const __u32 lowest_tsn)
704 struct sctp_chunk *retval;
707 ecne.lowest_tsn = htonl(lowest_tsn);
708 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
709 sizeof(sctp_ecnehdr_t), GFP_ATOMIC);
712 retval->subh.ecne_hdr =
713 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
719 /* Make a DATA chunk for the given association from the provided
720 * parameters. However, do not populate the data payload.
722 struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
723 const struct sctp_sndrcvinfo *sinfo,
724 int data_len, __u8 flags, __u16 ssn,
727 struct sctp_chunk *retval;
728 struct sctp_datahdr dp;
731 /* We assign the TSN as LATE as possible, not here when
732 * creating the chunk.
735 dp.stream = htons(sinfo->sinfo_stream);
736 dp.ppid = sinfo->sinfo_ppid;
738 /* Set the flags for an unordered send. */
739 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
740 flags |= SCTP_DATA_UNORDERED;
745 chunk_len = sizeof(dp) + data_len;
746 retval = sctp_make_data(asoc, flags, chunk_len, gfp);
750 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
751 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
757 /* Create a selective ackowledgement (SACK) for the given
758 * association. This reports on which TSN's we've seen to date,
759 * including duplicates and gaps.
761 struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
763 struct sctp_chunk *retval;
764 struct sctp_sackhdr sack;
767 __u16 num_gabs, num_dup_tsns;
768 struct sctp_association *aptr = (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 struct sctp_transport *trans;
773 memset(gabs, 0, sizeof(gabs));
774 ctsn = sctp_tsnmap_get_ctsn(map);
776 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
778 /* How much room is needed in the chunk? */
779 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
780 num_dup_tsns = sctp_tsnmap_num_dups(map);
782 /* Initialize the SACK header. */
783 sack.cum_tsn_ack = htonl(ctsn);
784 sack.a_rwnd = htonl(asoc->a_rwnd);
785 sack.num_gap_ack_blocks = htons(num_gabs);
786 sack.num_dup_tsns = htons(num_dup_tsns);
789 + sizeof(struct sctp_gap_ack_block) * num_gabs
790 + sizeof(__u32) * num_dup_tsns;
792 /* Create the chunk. */
793 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
797 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
799 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
800 * HEARTBEAT ACK, etc.) to the same destination transport
801 * address from which it received the DATA or control chunk to
802 * which it is replying. This rule should also be followed if
803 * the endpoint is bundling DATA chunks together with the
806 * However, when acknowledging multiple DATA chunks received
807 * in packets from different source addresses in a single
808 * SACK, the SACK chunk may be transmitted to one of the
809 * destination transport addresses from which the DATA or
810 * control chunks being acknowledged were received.
812 * [BUG: We do not implement the following paragraph.
813 * Perhaps we should remember the last transport we used for a
814 * SACK and avoid that (if possible) if we have seen any
815 * duplicates. --piggy]
817 * When a receiver of a duplicate DATA chunk sends a SACK to a
818 * multi- homed endpoint it MAY be beneficial to vary the
819 * destination address and not use the source address of the
820 * DATA chunk. The reason being that receiving a duplicate
821 * from a multi-homed endpoint might indicate that the return
822 * path (as specified in the source address of the DATA chunk)
823 * for the SACK is broken.
825 * [Send to the address from which we last received a DATA chunk.]
827 retval->transport = asoc->peer.last_data_from;
829 retval->subh.sack_hdr =
830 sctp_addto_chunk(retval, sizeof(sack), &sack);
832 /* Add the gap ack block information. */
834 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
837 /* Add the duplicate TSN information. */
839 aptr->stats.idupchunks += num_dup_tsns;
840 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
841 sctp_tsnmap_get_dups(map));
843 /* Once we have a sack generated, check to see what our sack
844 * generation is, if its 0, reset the transports to 0, and reset
845 * the association generation to 1
847 * The idea is that zero is never used as a valid generation for the
848 * association so no transport will match after a wrap event like this,
849 * Until the next sack
851 if (++aptr->peer.sack_generation == 0) {
852 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
854 trans->sack_generation = 0;
855 aptr->peer.sack_generation = 1;
861 /* Make a SHUTDOWN chunk. */
862 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
863 const struct sctp_chunk *chunk)
865 struct sctp_chunk *retval;
866 sctp_shutdownhdr_t shut;
869 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
870 shut.cum_tsn_ack = htonl(ctsn);
872 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
873 sizeof(sctp_shutdownhdr_t), GFP_ATOMIC);
877 retval->subh.shutdown_hdr =
878 sctp_addto_chunk(retval, sizeof(shut), &shut);
881 retval->transport = chunk->transport;
886 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
887 const struct sctp_chunk *chunk)
889 struct sctp_chunk *retval;
891 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
894 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
896 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
897 * HEARTBEAT ACK, * etc.) to the same destination transport
898 * address from which it * received the DATA or control chunk
899 * to which it is replying.
901 * [ACK back to where the SHUTDOWN came from.]
904 retval->transport = chunk->transport;
909 struct sctp_chunk *sctp_make_shutdown_complete(
910 const struct sctp_association *asoc,
911 const struct sctp_chunk *chunk)
913 struct sctp_chunk *retval;
916 /* Set the T-bit if we have no association (vtag will be
919 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
921 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
924 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
926 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
927 * HEARTBEAT ACK, * etc.) to the same destination transport
928 * address from which it * received the DATA or control chunk
929 * to which it is replying.
931 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
935 retval->transport = chunk->transport;
940 /* Create an ABORT. Note that we set the T bit if we have no
941 * association, except when responding to an INIT (sctpimpguide 2.41).
943 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
944 const struct sctp_chunk *chunk,
947 struct sctp_chunk *retval;
950 /* Set the T-bit if we have no association and 'chunk' is not
951 * an INIT (vtag will be reflected).
954 if (chunk && chunk->chunk_hdr &&
955 chunk->chunk_hdr->type == SCTP_CID_INIT)
958 flags = SCTP_CHUNK_FLAG_T;
961 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
964 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
966 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
967 * HEARTBEAT ACK, * etc.) to the same destination transport
968 * address from which it * received the DATA or control chunk
969 * to which it is replying.
971 * [ABORT back to where the offender came from.]
974 retval->transport = chunk->transport;
979 /* Helper to create ABORT with a NO_USER_DATA error. */
980 struct sctp_chunk *sctp_make_abort_no_data(
981 const struct sctp_association *asoc,
982 const struct sctp_chunk *chunk, __u32 tsn)
984 struct sctp_chunk *retval;
987 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
993 /* Put the tsn back into network byte order. */
994 payload = htonl(tsn);
995 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
996 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
998 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1000 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1001 * HEARTBEAT ACK, * etc.) to the same destination transport
1002 * address from which it * received the DATA or control chunk
1003 * to which it is replying.
1005 * [ABORT back to where the offender came from.]
1008 retval->transport = chunk->transport;
1014 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1015 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1019 struct sctp_chunk *retval;
1020 void *payload = NULL;
1023 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
1028 /* Put the msg_iov together into payload. */
1029 payload = kmalloc(paylen, GFP_KERNEL);
1033 err = memcpy_from_msg(payload, msg, paylen);
1038 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1039 sctp_addto_chunk(retval, paylen, payload);
1049 sctp_chunk_free(retval);
1055 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1058 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1062 int chunklen = ntohs(chunk->chunk_hdr->length);
1064 target = skb_put(chunk->skb, len);
1067 memcpy(target, data, len);
1069 memset(target, 0, len);
1071 /* Adjust the chunk length field. */
1072 chunk->chunk_hdr->length = htons(chunklen + len);
1073 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1078 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1079 struct sctp_chunk *sctp_make_abort_violation(
1080 const struct sctp_association *asoc,
1081 const struct sctp_chunk *chunk,
1082 const __u8 *payload,
1083 const size_t paylen)
1085 struct sctp_chunk *retval;
1086 struct sctp_paramhdr phdr;
1088 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
1089 + sizeof(sctp_paramhdr_t));
1093 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1094 + sizeof(sctp_paramhdr_t));
1096 phdr.type = htons(chunk->chunk_hdr->type);
1097 phdr.length = chunk->chunk_hdr->length;
1098 sctp_addto_chunk(retval, paylen, payload);
1099 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1105 struct sctp_chunk *sctp_make_violation_paramlen(
1106 const struct sctp_association *asoc,
1107 const struct sctp_chunk *chunk,
1108 struct sctp_paramhdr *param)
1110 struct sctp_chunk *retval;
1111 static const char error[] = "The following parameter had invalid length:";
1112 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1113 sizeof(sctp_paramhdr_t);
1115 retval = sctp_make_abort(asoc, chunk, payload_len);
1119 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1120 sizeof(error) + sizeof(sctp_paramhdr_t));
1121 sctp_addto_chunk(retval, sizeof(error), error);
1122 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1128 struct sctp_chunk *sctp_make_violation_max_retrans(
1129 const struct sctp_association *asoc,
1130 const struct sctp_chunk *chunk)
1132 struct sctp_chunk *retval;
1133 static const char error[] = "Association exceeded its max_retans count";
1134 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t);
1136 retval = sctp_make_abort(asoc, chunk, payload_len);
1140 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1141 sctp_addto_chunk(retval, sizeof(error), error);
1147 /* Make a HEARTBEAT chunk. */
1148 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1149 const struct sctp_transport *transport)
1151 struct sctp_chunk *retval;
1152 sctp_sender_hb_info_t hbinfo;
1154 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1155 sizeof(hbinfo), GFP_ATOMIC);
1160 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1161 hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
1162 hbinfo.daddr = transport->ipaddr;
1163 hbinfo.sent_at = jiffies;
1164 hbinfo.hb_nonce = transport->hb_nonce;
1166 /* Cast away the 'const', as this is just telling the chunk
1167 * what transport it belongs to.
1169 retval->transport = (struct sctp_transport *) transport;
1170 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1177 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1178 const struct sctp_chunk *chunk,
1179 const void *payload, const size_t paylen)
1181 struct sctp_chunk *retval;
1183 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1188 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1190 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1192 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1193 * HEARTBEAT ACK, * etc.) to the same destination transport
1194 * address from which it * received the DATA or control chunk
1195 * to which it is replying.
1197 * [HBACK back to where the HEARTBEAT came from.]
1200 retval->transport = chunk->transport;
1206 /* Create an Operation Error chunk with the specified space reserved.
1207 * This routine can be used for containing multiple causes in the chunk.
1209 static struct sctp_chunk *sctp_make_op_error_space(
1210 const struct sctp_association *asoc,
1211 const struct sctp_chunk *chunk,
1214 struct sctp_chunk *retval;
1216 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1217 sizeof(sctp_errhdr_t) + size, GFP_ATOMIC);
1221 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1223 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1224 * HEARTBEAT ACK, etc.) to the same destination transport
1225 * address from which it received the DATA or control chunk
1226 * to which it is replying.
1230 retval->transport = chunk->transport;
1236 /* Create an Operation Error chunk of a fixed size,
1237 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1238 * This is a helper function to allocate an error chunk for
1239 * for those invalid parameter codes in which we may not want
1240 * to report all the errors, if the incoming chunk is large
1242 static inline struct sctp_chunk *sctp_make_op_error_fixed(
1243 const struct sctp_association *asoc,
1244 const struct sctp_chunk *chunk)
1246 size_t size = asoc ? asoc->pathmtu : 0;
1249 size = SCTP_DEFAULT_MAXSEGMENT;
1251 return sctp_make_op_error_space(asoc, chunk, size);
1254 /* Create an Operation Error chunk. */
1255 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1256 const struct sctp_chunk *chunk,
1257 __be16 cause_code, const void *payload,
1258 size_t paylen, size_t reserve_tail)
1260 struct sctp_chunk *retval;
1262 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1266 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1267 sctp_addto_chunk(retval, paylen, payload);
1269 sctp_addto_param(retval, reserve_tail, NULL);
1275 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1277 struct sctp_chunk *retval;
1278 struct sctp_hmac *hmac_desc;
1279 struct sctp_authhdr auth_hdr;
1282 /* Get the first hmac that the peer told us to use */
1283 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1284 if (unlikely(!hmac_desc))
1287 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1288 hmac_desc->hmac_len + sizeof(sctp_authhdr_t),
1293 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1294 auth_hdr.shkey_id = htons(asoc->active_key_id);
1296 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1299 hmac = skb_put_zero(retval->skb, hmac_desc->hmac_len);
1301 /* Adjust the chunk header to include the empty MAC */
1302 retval->chunk_hdr->length =
1303 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1304 retval->chunk_end = skb_tail_pointer(retval->skb);
1310 /********************************************************************
1311 * 2nd Level Abstractions
1312 ********************************************************************/
1314 /* Turn an skb into a chunk.
1315 * FIXME: Eventually move the structure directly inside the skb->cb[].
1317 * sctpimpguide-05.txt Section 2.8.2
1318 * M1) Each time a new DATA chunk is transmitted
1319 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1320 * 'TSN.Missing.Report' count will be used to determine missing chunks
1321 * and when to fast retransmit.
1324 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1325 const struct sctp_association *asoc,
1326 struct sock *sk, gfp_t gfp)
1328 struct sctp_chunk *retval;
1330 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1335 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1337 INIT_LIST_HEAD(&retval->list);
1339 retval->asoc = (struct sctp_association *)asoc;
1340 retval->singleton = 1;
1342 retval->fast_retransmit = SCTP_CAN_FRTX;
1344 /* Polish the bead hole. */
1345 INIT_LIST_HEAD(&retval->transmitted_list);
1346 INIT_LIST_HEAD(&retval->frag_list);
1347 SCTP_DBG_OBJCNT_INC(chunk);
1348 atomic_set(&retval->refcnt, 1);
1354 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1355 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1356 union sctp_addr *dest)
1358 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1359 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1362 /* Extract the source address from a chunk. */
1363 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1365 /* If we have a known transport, use that. */
1366 if (chunk->transport) {
1367 return &chunk->transport->ipaddr;
1369 /* Otherwise, extract it from the IP header. */
1370 return &chunk->source;
1374 /* Create a new chunk, setting the type and flags headers from the
1375 * arguments, reserving enough space for a 'paylen' byte payload.
1377 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1378 __u8 type, __u8 flags, int paylen,
1381 struct sctp_chunk *retval;
1382 sctp_chunkhdr_t *chunk_hdr;
1383 struct sk_buff *skb;
1386 /* No need to allocate LL here, as this is only a chunk. */
1387 skb = alloc_skb(SCTP_PAD4(sizeof(sctp_chunkhdr_t) + paylen), gfp);
1391 /* Make room for the chunk header. */
1392 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1393 chunk_hdr->type = type;
1394 chunk_hdr->flags = flags;
1395 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1397 sk = asoc ? asoc->base.sk : NULL;
1398 retval = sctp_chunkify(skb, asoc, sk, gfp);
1404 retval->chunk_hdr = chunk_hdr;
1405 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1407 /* Determine if the chunk needs to be authenticated */
1408 if (sctp_auth_send_cid(type, asoc))
1416 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1417 __u8 flags, int paylen, gfp_t gfp)
1419 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1422 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1423 __u8 type, __u8 flags, int paylen,
1426 struct sctp_chunk *chunk;
1428 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1430 sctp_control_set_owner_w(chunk);
1435 /* Release the memory occupied by a chunk. */
1436 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1438 BUG_ON(!list_empty(&chunk->list));
1439 list_del_init(&chunk->transmitted_list);
1441 consume_skb(chunk->skb);
1442 consume_skb(chunk->auth_chunk);
1444 SCTP_DBG_OBJCNT_DEC(chunk);
1445 kmem_cache_free(sctp_chunk_cachep, chunk);
1448 /* Possibly, free the chunk. */
1449 void sctp_chunk_free(struct sctp_chunk *chunk)
1451 /* Release our reference on the message tracker. */
1453 sctp_datamsg_put(chunk->msg);
1455 sctp_chunk_put(chunk);
1458 /* Grab a reference to the chunk. */
1459 void sctp_chunk_hold(struct sctp_chunk *ch)
1461 atomic_inc(&ch->refcnt);
1464 /* Release a reference to the chunk. */
1465 void sctp_chunk_put(struct sctp_chunk *ch)
1467 if (atomic_dec_and_test(&ch->refcnt))
1468 sctp_chunk_destroy(ch);
1471 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1474 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1478 int chunklen = ntohs(chunk->chunk_hdr->length);
1479 int padlen = SCTP_PAD4(chunklen) - chunklen;
1481 padding = skb_put_zero(chunk->skb, padlen);
1482 target = skb_put(chunk->skb, len);
1484 memcpy(target, data, len);
1486 /* Adjust the chunk length field. */
1487 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1488 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1493 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1494 * space in the chunk
1496 static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1497 int len, const void *data)
1499 if (skb_tailroom(chunk->skb) >= len)
1500 return sctp_addto_chunk(chunk, len, data);
1505 /* Append bytes from user space to the end of a chunk. Will panic if
1506 * chunk is not big enough.
1507 * Returns a kernel err value.
1509 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1510 struct iov_iter *from)
1514 /* Make room in chunk for data. */
1515 target = skb_put(chunk->skb, len);
1517 /* Copy data (whole iovec) into chunk */
1518 if (!copy_from_iter_full(target, len, from))
1521 /* Adjust the chunk length field. */
1522 chunk->chunk_hdr->length =
1523 htons(ntohs(chunk->chunk_hdr->length) + len);
1524 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1529 /* Helper function to assign a TSN if needed. This assumes that both
1530 * the data_hdr and association have already been assigned.
1532 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1534 struct sctp_datamsg *msg;
1535 struct sctp_chunk *lchunk;
1536 struct sctp_stream *stream;
1543 /* All fragments will be on the same stream */
1544 sid = ntohs(chunk->subh.data_hdr->stream);
1545 stream = &chunk->asoc->stream;
1547 /* Now assign the sequence number to the entire message.
1548 * All fragments must have the same stream sequence number.
1551 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1552 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1555 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1556 ssn = sctp_ssn_next(stream, out, sid);
1558 ssn = sctp_ssn_peek(stream, out, sid);
1561 lchunk->subh.data_hdr->ssn = htons(ssn);
1562 lchunk->has_ssn = 1;
1566 /* Helper function to assign a TSN if needed. This assumes that both
1567 * the data_hdr and association have already been assigned.
1569 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1571 if (!chunk->has_tsn) {
1572 /* This is the last possible instant to
1575 chunk->subh.data_hdr->tsn =
1576 htonl(sctp_association_get_next_tsn(chunk->asoc));
1581 /* Create a CLOSED association to use with an incoming packet. */
1582 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1583 struct sctp_chunk *chunk,
1586 struct sctp_association *asoc;
1587 struct sk_buff *skb;
1590 /* Create the bare association. */
1591 scope = sctp_scope(sctp_source(chunk));
1592 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1597 /* Create an entry for the source address of the packet. */
1598 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1604 /* Build a cookie representing asoc.
1605 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1607 static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1608 const struct sctp_association *asoc,
1609 const struct sctp_chunk *init_chunk,
1611 const __u8 *raw_addrs, int addrs_len)
1613 sctp_cookie_param_t *retval;
1614 struct sctp_signed_cookie *cookie;
1615 int headersize, bodysize;
1617 /* Header size is static data prior to the actual cookie, including
1620 headersize = sizeof(sctp_paramhdr_t) +
1621 (sizeof(struct sctp_signed_cookie) -
1622 sizeof(struct sctp_cookie));
1623 bodysize = sizeof(struct sctp_cookie)
1624 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1626 /* Pad out the cookie to a multiple to make the signature
1627 * functions simpler to write.
1629 if (bodysize % SCTP_COOKIE_MULTIPLE)
1630 bodysize += SCTP_COOKIE_MULTIPLE
1631 - (bodysize % SCTP_COOKIE_MULTIPLE);
1632 *cookie_len = headersize + bodysize;
1634 /* Clear this memory since we are sending this data structure
1635 * out on the network.
1637 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1641 cookie = (struct sctp_signed_cookie *) retval->body;
1643 /* Set up the parameter header. */
1644 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1645 retval->p.length = htons(*cookie_len);
1647 /* Copy the cookie part of the association itself. */
1648 cookie->c = asoc->c;
1649 /* Save the raw address list length in the cookie. */
1650 cookie->c.raw_addr_list_len = addrs_len;
1652 /* Remember PR-SCTP capability. */
1653 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1655 /* Save adaptation indication in the cookie. */
1656 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1658 /* Set an expiration time for the cookie. */
1659 cookie->c.expiration = ktime_add(asoc->cookie_life,
1662 /* Copy the peer's init packet. */
1663 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1664 ntohs(init_chunk->chunk_hdr->length));
1666 /* Copy the raw local address list of the association. */
1667 memcpy((__u8 *)&cookie->c.peer_init[0] +
1668 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1670 if (sctp_sk(ep->base.sk)->hmac) {
1671 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1674 /* Sign the message. */
1675 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1678 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1679 sizeof(ep->secret_key)) ?:
1680 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1682 shash_desc_zero(desc);
1696 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1697 struct sctp_association *sctp_unpack_cookie(
1698 const struct sctp_endpoint *ep,
1699 const struct sctp_association *asoc,
1700 struct sctp_chunk *chunk, gfp_t gfp,
1701 int *error, struct sctp_chunk **errp)
1703 struct sctp_association *retval = NULL;
1704 struct sctp_signed_cookie *cookie;
1705 struct sctp_cookie *bear_cookie;
1706 int headersize, bodysize, fixed_size;
1707 __u8 *digest = ep->digest;
1710 struct sk_buff *skb = chunk->skb;
1713 /* Header size is static data prior to the actual cookie, including
1716 headersize = sizeof(sctp_chunkhdr_t) +
1717 (sizeof(struct sctp_signed_cookie) -
1718 sizeof(struct sctp_cookie));
1719 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1720 fixed_size = headersize + sizeof(struct sctp_cookie);
1722 /* Verify that the chunk looks like it even has a cookie.
1723 * There must be enough room for our cookie and our peer's
1726 len = ntohs(chunk->chunk_hdr->length);
1727 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1730 /* Verify that the cookie has been padded out. */
1731 if (bodysize % SCTP_COOKIE_MULTIPLE)
1734 /* Process the cookie. */
1735 cookie = chunk->subh.cookie_hdr;
1736 bear_cookie = &cookie->c;
1738 if (!sctp_sk(ep->base.sk)->hmac)
1741 /* Check the signature. */
1743 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1746 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1749 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1750 sizeof(ep->secret_key)) ?:
1751 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1753 shash_desc_zero(desc);
1756 *error = -SCTP_IERROR_NOMEM;
1761 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1762 *error = -SCTP_IERROR_BAD_SIG;
1767 /* IG Section 2.35.2:
1768 * 3) Compare the port numbers and the verification tag contained
1769 * within the COOKIE ECHO chunk to the actual port numbers and the
1770 * verification tag within the SCTP common header of the received
1771 * packet. If these values do not match the packet MUST be silently
1774 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1775 *error = -SCTP_IERROR_BAD_TAG;
1779 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1780 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1781 *error = -SCTP_IERROR_BAD_PORTS;
1785 /* Check to see if the cookie is stale. If there is already
1786 * an association, there is no need to check cookie's expiration
1787 * for init collision case of lost COOKIE ACK.
1788 * If skb has been timestamped, then use the stamp, otherwise
1789 * use current time. This introduces a small possibility that
1790 * that a cookie may be considered expired, but his would only slow
1791 * down the new association establishment instead of every packet.
1793 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1794 kt = skb_get_ktime(skb);
1796 kt = ktime_get_real();
1798 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
1800 * Section 3.3.10.3 Stale Cookie Error (3)
1804 * Stale Cookie Error: Indicates the receipt of a valid State
1805 * Cookie that has expired.
1807 len = ntohs(chunk->chunk_hdr->length);
1808 *errp = sctp_make_op_error_space(asoc, chunk, len);
1810 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1811 __be32 n = htonl(usecs);
1813 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
1815 sctp_addto_chunk(*errp, sizeof(n), &n);
1816 *error = -SCTP_IERROR_STALE_COOKIE;
1818 *error = -SCTP_IERROR_NOMEM;
1823 /* Make a new base association. */
1824 scope = sctp_scope(sctp_source(chunk));
1825 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1827 *error = -SCTP_IERROR_NOMEM;
1831 /* Set up our peer's port number. */
1832 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1834 /* Populate the association from the cookie. */
1835 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1837 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1839 *error = -SCTP_IERROR_NOMEM;
1843 /* Also, add the destination address. */
1844 if (list_empty(&retval->base.bind_addr.address_list)) {
1845 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1846 sizeof(chunk->dest), SCTP_ADDR_SRC,
1850 retval->next_tsn = retval->c.initial_tsn;
1851 retval->ctsn_ack_point = retval->next_tsn - 1;
1852 retval->addip_serial = retval->c.initial_tsn;
1853 retval->strreset_outseq = retval->c.initial_tsn;
1854 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1855 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1856 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1858 /* The INIT stuff will be done by the side effects. */
1863 sctp_association_free(retval);
1868 /* Yikes! The packet is either corrupt or deliberately
1871 *error = -SCTP_IERROR_MALFORMED;
1875 /********************************************************************
1876 * 3rd Level Abstractions
1877 ********************************************************************/
1879 struct __sctp_missing {
1885 * Report a missing mandatory parameter.
1887 static int sctp_process_missing_param(const struct sctp_association *asoc,
1888 sctp_param_t paramtype,
1889 struct sctp_chunk *chunk,
1890 struct sctp_chunk **errp)
1892 struct __sctp_missing report;
1895 len = SCTP_PAD4(sizeof(report));
1897 /* Make an ERROR chunk, preparing enough room for
1898 * returning multiple unknown parameters.
1901 *errp = sctp_make_op_error_space(asoc, chunk, len);
1904 report.num_missing = htonl(1);
1905 report.type = paramtype;
1906 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1908 sctp_addto_chunk(*errp, sizeof(report), &report);
1911 /* Stop processing this chunk. */
1915 /* Report an Invalid Mandatory Parameter. */
1916 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1917 struct sctp_chunk *chunk,
1918 struct sctp_chunk **errp)
1920 /* Invalid Mandatory Parameter Error has no payload. */
1923 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1926 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1928 /* Stop processing this chunk. */
1932 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1933 struct sctp_paramhdr *param,
1934 const struct sctp_chunk *chunk,
1935 struct sctp_chunk **errp)
1937 /* This is a fatal error. Any accumulated non-fatal errors are
1941 sctp_chunk_free(*errp);
1943 /* Create an error chunk and fill it in with our payload. */
1944 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1950 /* Do not attempt to handle the HOST_NAME parm. However, do
1951 * send back an indicator to the peer.
1953 static int sctp_process_hn_param(const struct sctp_association *asoc,
1954 union sctp_params param,
1955 struct sctp_chunk *chunk,
1956 struct sctp_chunk **errp)
1958 __u16 len = ntohs(param.p->length);
1960 /* Processing of the HOST_NAME parameter will generate an
1961 * ABORT. If we've accumulated any non-fatal errors, they
1962 * would be unrecognized parameters and we should not include
1963 * them in the ABORT.
1966 sctp_chunk_free(*errp);
1968 *errp = sctp_make_op_error_space(asoc, chunk, len);
1971 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1972 sctp_addto_chunk(*errp, len, param.v);
1975 /* Stop processing this chunk. */
1979 static int sctp_verify_ext_param(struct net *net, union sctp_params param)
1981 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1983 int have_asconf = 0;
1986 for (i = 0; i < num_ext; i++) {
1987 switch (param.ext->chunks[i]) {
1991 case SCTP_CID_ASCONF:
1992 case SCTP_CID_ASCONF_ACK:
1998 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1999 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
2000 * only if ADD-IP is turned on and we are not backward-compatible
2003 if (net->sctp.addip_noauth)
2006 if (net->sctp.addip_enable && !have_auth && have_asconf)
2012 static void sctp_process_ext_param(struct sctp_association *asoc,
2013 union sctp_params param)
2015 struct net *net = sock_net(asoc->base.sk);
2016 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2019 for (i = 0; i < num_ext; i++) {
2020 switch (param.ext->chunks[i]) {
2021 case SCTP_CID_RECONF:
2022 if (asoc->reconf_enable &&
2023 !asoc->peer.reconf_capable)
2024 asoc->peer.reconf_capable = 1;
2026 case SCTP_CID_FWD_TSN:
2027 if (asoc->prsctp_enable && !asoc->peer.prsctp_capable)
2028 asoc->peer.prsctp_capable = 1;
2031 /* if the peer reports AUTH, assume that he
2034 if (asoc->ep->auth_enable)
2035 asoc->peer.auth_capable = 1;
2037 case SCTP_CID_ASCONF:
2038 case SCTP_CID_ASCONF_ACK:
2039 if (net->sctp.addip_enable)
2040 asoc->peer.asconf_capable = 1;
2048 /* RFC 3.2.1 & the Implementers Guide 2.2.
2050 * The Parameter Types are encoded such that the
2051 * highest-order two bits specify the action that must be
2052 * taken if the processing endpoint does not recognize the
2055 * 00 - Stop processing this parameter; do not process any further
2056 * parameters within this chunk
2058 * 01 - Stop processing this parameter, do not process any further
2059 * parameters within this chunk, and report the unrecognized
2060 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2062 * 10 - Skip this parameter and continue processing.
2064 * 11 - Skip this parameter and continue processing but
2065 * report the unrecognized parameter in an
2066 * 'Unrecognized Parameter' ERROR chunk.
2069 * SCTP_IERROR_NO_ERROR - continue with the chunk
2070 * SCTP_IERROR_ERROR - stop and report an error.
2071 * SCTP_IERROR_NOMEME - out of memory.
2073 static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2074 union sctp_params param,
2075 struct sctp_chunk *chunk,
2076 struct sctp_chunk **errp)
2078 int retval = SCTP_IERROR_NO_ERROR;
2080 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2081 case SCTP_PARAM_ACTION_DISCARD:
2082 retval = SCTP_IERROR_ERROR;
2084 case SCTP_PARAM_ACTION_SKIP:
2086 case SCTP_PARAM_ACTION_DISCARD_ERR:
2087 retval = SCTP_IERROR_ERROR;
2089 case SCTP_PARAM_ACTION_SKIP_ERR:
2090 /* Make an ERROR chunk, preparing enough room for
2091 * returning multiple unknown parameters.
2094 *errp = sctp_make_op_error_fixed(asoc, chunk);
2097 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2098 SCTP_PAD4(ntohs(param.p->length))))
2099 sctp_addto_chunk_fixed(*errp,
2100 SCTP_PAD4(ntohs(param.p->length)),
2103 /* If there is no memory for generating the ERROR
2104 * report as specified, an ABORT will be triggered
2105 * to the peer and the association won't be
2108 retval = SCTP_IERROR_NOMEM;
2118 /* Verify variable length parameters
2120 * SCTP_IERROR_ABORT - trigger an ABORT
2121 * SCTP_IERROR_NOMEM - out of memory (abort)
2122 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2123 * SCTP_IERROR_NO_ERROR - continue with the chunk
2125 static sctp_ierror_t sctp_verify_param(struct net *net,
2126 const struct sctp_endpoint *ep,
2127 const struct sctp_association *asoc,
2128 union sctp_params param,
2130 struct sctp_chunk *chunk,
2131 struct sctp_chunk **err_chunk)
2133 struct sctp_hmac_algo_param *hmacs;
2134 int retval = SCTP_IERROR_NO_ERROR;
2135 __u16 n_elt, id = 0;
2138 /* FIXME - This routine is not looking at each parameter per the
2139 * chunk type, i.e., unrecognized parameters should be further
2140 * identified based on the chunk id.
2143 switch (param.p->type) {
2144 case SCTP_PARAM_IPV4_ADDRESS:
2145 case SCTP_PARAM_IPV6_ADDRESS:
2146 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2147 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2148 case SCTP_PARAM_STATE_COOKIE:
2149 case SCTP_PARAM_HEARTBEAT_INFO:
2150 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2151 case SCTP_PARAM_ECN_CAPABLE:
2152 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2155 case SCTP_PARAM_SUPPORTED_EXT:
2156 if (!sctp_verify_ext_param(net, param))
2157 return SCTP_IERROR_ABORT;
2160 case SCTP_PARAM_SET_PRIMARY:
2161 if (net->sctp.addip_enable)
2165 case SCTP_PARAM_HOST_NAME_ADDRESS:
2166 /* Tell the peer, we won't support this param. */
2167 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2168 retval = SCTP_IERROR_ABORT;
2171 case SCTP_PARAM_FWD_TSN_SUPPORT:
2172 if (ep->prsctp_enable)
2176 case SCTP_PARAM_RANDOM:
2177 if (!ep->auth_enable)
2180 /* SCTP-AUTH: Secion 6.1
2181 * If the random number is not 32 byte long the association
2182 * MUST be aborted. The ABORT chunk SHOULD contain the error
2183 * cause 'Protocol Violation'.
2185 if (SCTP_AUTH_RANDOM_LENGTH !=
2186 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2187 sctp_process_inv_paramlength(asoc, param.p,
2189 retval = SCTP_IERROR_ABORT;
2193 case SCTP_PARAM_CHUNKS:
2194 if (!ep->auth_enable)
2197 /* SCTP-AUTH: Section 3.2
2198 * The CHUNKS parameter MUST be included once in the INIT or
2199 * INIT-ACK chunk if the sender wants to receive authenticated
2200 * chunks. Its maximum length is 260 bytes.
2202 if (260 < ntohs(param.p->length)) {
2203 sctp_process_inv_paramlength(asoc, param.p,
2205 retval = SCTP_IERROR_ABORT;
2209 case SCTP_PARAM_HMAC_ALGO:
2210 if (!ep->auth_enable)
2213 hmacs = (struct sctp_hmac_algo_param *)param.p;
2214 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2216 /* SCTP-AUTH: Section 6.1
2217 * The HMAC algorithm based on SHA-1 MUST be supported and
2218 * included in the HMAC-ALGO parameter.
2220 for (i = 0; i < n_elt; i++) {
2221 id = ntohs(hmacs->hmac_ids[i]);
2223 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2227 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2228 sctp_process_inv_paramlength(asoc, param.p, chunk,
2230 retval = SCTP_IERROR_ABORT;
2235 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2236 __func__, ntohs(param.p->type), cid);
2238 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2244 /* Verify the INIT packet before we process it. */
2245 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2246 const struct sctp_association *asoc, sctp_cid_t cid,
2247 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk,
2248 struct sctp_chunk **errp)
2250 union sctp_params param;
2251 bool has_cookie = false;
2254 /* Check for missing mandatory parameters. Note: Initial TSN is
2255 * also mandatory, but is not checked here since the valid range
2256 * is 0..2**32-1. RFC4960, section 3.3.3.
2258 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2259 peer_init->init_hdr.num_inbound_streams == 0 ||
2260 peer_init->init_hdr.init_tag == 0 ||
2261 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2262 return sctp_process_inv_mandatory(asoc, chunk, errp);
2264 sctp_walk_params(param, peer_init, init_hdr.params) {
2265 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2269 /* There is a possibility that a parameter length was bad and
2270 * in that case we would have stoped walking the parameters.
2271 * The current param.p would point at the bad one.
2272 * Current consensus on the mailing list is to generate a PROTOCOL
2273 * VIOLATION error. We build the ERROR chunk here and let the normal
2274 * error handling code build and send the packet.
2276 if (param.v != (void *)chunk->chunk_end)
2277 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2279 /* The only missing mandatory param possible today is
2280 * the state cookie for an INIT-ACK chunk.
2282 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2283 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2286 /* Verify all the variable length parameters */
2287 sctp_walk_params(param, peer_init, init_hdr.params) {
2288 result = sctp_verify_param(net, ep, asoc, param, cid,
2291 case SCTP_IERROR_ABORT:
2292 case SCTP_IERROR_NOMEM:
2294 case SCTP_IERROR_ERROR:
2296 case SCTP_IERROR_NO_ERROR:
2301 } /* for (loop through all parameters) */
2306 /* Unpack the parameters in an INIT packet into an association.
2307 * Returns 0 on failure, else success.
2308 * FIXME: This is an association method.
2310 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2311 const union sctp_addr *peer_addr,
2312 sctp_init_chunk_t *peer_init, gfp_t gfp)
2314 struct net *net = sock_net(asoc->base.sk);
2315 union sctp_params param;
2316 struct sctp_transport *transport;
2317 struct list_head *pos, *temp;
2319 union sctp_addr addr;
2323 /* We must include the address that the INIT packet came from.
2324 * This is the only address that matters for an INIT packet.
2325 * When processing a COOKIE ECHO, we retrieve the from address
2326 * of the INIT from the cookie.
2329 /* This implementation defaults to making the first transport
2330 * added as the primary transport. The source address seems to
2331 * be a a better choice than any of the embedded addresses.
2333 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2336 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2339 /* Process the initialization parameters. */
2340 sctp_walk_params(param, peer_init, init_hdr.params) {
2341 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2342 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2343 af = sctp_get_af_specific(param_type2af(param.p->type));
2344 af->from_addr_param(&addr, param.addr,
2345 chunk->sctp_hdr->source, 0);
2346 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2350 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2354 /* source address of chunk may not match any valid address */
2358 /* AUTH: After processing the parameters, make sure that we
2359 * have all the required info to potentially do authentications.
2361 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2362 !asoc->peer.peer_hmacs))
2363 asoc->peer.auth_capable = 0;
2365 /* In a non-backward compatible mode, if the peer claims
2366 * support for ADD-IP but not AUTH, the ADD-IP spec states
2367 * that we MUST ABORT the association. Section 6. The section
2368 * also give us an option to silently ignore the packet, which
2369 * is what we'll do here.
2371 if (!net->sctp.addip_noauth &&
2372 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2373 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2375 SCTP_PARAM_SET_PRIMARY);
2376 asoc->peer.asconf_capable = 0;
2380 /* Walk list of transports, removing transports in the UNKNOWN state. */
2381 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2382 transport = list_entry(pos, struct sctp_transport, transports);
2383 if (transport->state == SCTP_UNKNOWN) {
2384 sctp_assoc_rm_peer(asoc, transport);
2388 /* The fixed INIT headers are always in network byte
2391 asoc->peer.i.init_tag =
2392 ntohl(peer_init->init_hdr.init_tag);
2393 asoc->peer.i.a_rwnd =
2394 ntohl(peer_init->init_hdr.a_rwnd);
2395 asoc->peer.i.num_outbound_streams =
2396 ntohs(peer_init->init_hdr.num_outbound_streams);
2397 asoc->peer.i.num_inbound_streams =
2398 ntohs(peer_init->init_hdr.num_inbound_streams);
2399 asoc->peer.i.initial_tsn =
2400 ntohl(peer_init->init_hdr.initial_tsn);
2402 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2404 /* Apply the upper bounds for output streams based on peer's
2405 * number of inbound streams.
2407 if (asoc->c.sinit_num_ostreams >
2408 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2409 asoc->c.sinit_num_ostreams =
2410 ntohs(peer_init->init_hdr.num_inbound_streams);
2413 if (asoc->c.sinit_max_instreams >
2414 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2415 asoc->c.sinit_max_instreams =
2416 ntohs(peer_init->init_hdr.num_outbound_streams);
2419 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2420 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2422 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2423 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2425 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2426 cookie = asoc->peer.cookie;
2428 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
2429 if (!asoc->peer.cookie)
2433 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2434 * high (for example, implementations MAY use the size of the receiver
2435 * advertised window).
2437 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2439 transport->ssthresh = asoc->peer.i.a_rwnd;
2442 /* Set up the TSN tracking pieces. */
2443 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2444 asoc->peer.i.initial_tsn, gfp))
2447 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2449 * The stream sequence number in all the streams shall start
2450 * from 0 when the association is established. Also, when the
2451 * stream sequence number reaches the value 65535 the next
2452 * stream sequence number shall be set to 0.
2455 if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
2456 asoc->c.sinit_max_instreams, gfp))
2459 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2462 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2464 * When an endpoint has an ASCONF signaled change to be sent to the
2465 * remote endpoint it should do the following:
2467 * A2) A serial number should be assigned to the Chunk. The serial
2468 * number should be a monotonically increasing number. All serial
2469 * numbers are defined to be initialized at the start of the
2470 * association to the same value as the Initial TSN.
2472 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2476 /* Release the transport structures. */
2477 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2478 transport = list_entry(pos, struct sctp_transport, transports);
2479 if (transport->state != SCTP_ACTIVE)
2480 sctp_assoc_rm_peer(asoc, transport);
2488 /* Update asoc with the option described in param.
2490 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2492 * asoc is the association to update.
2493 * param is the variable length parameter to use for update.
2494 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2495 * If the current packet is an INIT we want to minimize the amount of
2496 * work we do. In particular, we should not build transport
2497 * structures for the addresses.
2499 static int sctp_process_param(struct sctp_association *asoc,
2500 union sctp_params param,
2501 const union sctp_addr *peer_addr,
2504 struct net *net = sock_net(asoc->base.sk);
2505 union sctp_addr addr;
2512 union sctp_addr_param *addr_param;
2513 struct sctp_transport *t;
2514 struct sctp_endpoint *ep = asoc->ep;
2516 /* We maintain all INIT parameters in network byte order all the
2517 * time. This allows us to not worry about whether the parameters
2518 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2520 switch (param.p->type) {
2521 case SCTP_PARAM_IPV6_ADDRESS:
2522 if (PF_INET6 != asoc->base.sk->sk_family)
2526 case SCTP_PARAM_IPV4_ADDRESS:
2527 /* v4 addresses are not allowed on v6-only socket */
2528 if (ipv6_only_sock(asoc->base.sk))
2531 af = sctp_get_af_specific(param_type2af(param.p->type));
2532 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
2533 scope = sctp_scope(peer_addr);
2534 if (sctp_in_scope(net, &addr, scope))
2535 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2539 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2540 if (!net->sctp.cookie_preserve_enable)
2543 stale = ntohl(param.life->lifespan_increment);
2545 /* Suggested Cookie Life span increment's unit is msec,
2548 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2551 case SCTP_PARAM_HOST_NAME_ADDRESS:
2552 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2555 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2556 /* Turn off the default values first so we'll know which
2557 * ones are really set by the peer.
2559 asoc->peer.ipv4_address = 0;
2560 asoc->peer.ipv6_address = 0;
2562 /* Assume that peer supports the address family
2563 * by which it sends a packet.
2565 if (peer_addr->sa.sa_family == AF_INET6)
2566 asoc->peer.ipv6_address = 1;
2567 else if (peer_addr->sa.sa_family == AF_INET)
2568 asoc->peer.ipv4_address = 1;
2570 /* Cycle through address types; avoid divide by 0. */
2571 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2573 sat /= sizeof(__u16);
2575 for (i = 0; i < sat; ++i) {
2576 switch (param.sat->types[i]) {
2577 case SCTP_PARAM_IPV4_ADDRESS:
2578 asoc->peer.ipv4_address = 1;
2581 case SCTP_PARAM_IPV6_ADDRESS:
2582 if (PF_INET6 == asoc->base.sk->sk_family)
2583 asoc->peer.ipv6_address = 1;
2586 case SCTP_PARAM_HOST_NAME_ADDRESS:
2587 asoc->peer.hostname_address = 1;
2590 default: /* Just ignore anything else. */
2596 case SCTP_PARAM_STATE_COOKIE:
2597 asoc->peer.cookie_len =
2598 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2599 asoc->peer.cookie = param.cookie->body;
2602 case SCTP_PARAM_HEARTBEAT_INFO:
2603 /* Would be odd to receive, but it causes no problems. */
2606 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2607 /* Rejected during verify stage. */
2610 case SCTP_PARAM_ECN_CAPABLE:
2611 asoc->peer.ecn_capable = 1;
2614 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2615 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2618 case SCTP_PARAM_SET_PRIMARY:
2619 if (!net->sctp.addip_enable)
2622 addr_param = param.v + sizeof(sctp_addip_param_t);
2624 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2628 af->from_addr_param(&addr, addr_param,
2629 htons(asoc->peer.port), 0);
2631 /* if the address is invalid, we can't process it.
2632 * XXX: see spec for what to do.
2634 if (!af->addr_valid(&addr, NULL, NULL))
2637 t = sctp_assoc_lookup_paddr(asoc, &addr);
2641 sctp_assoc_set_primary(asoc, t);
2644 case SCTP_PARAM_SUPPORTED_EXT:
2645 sctp_process_ext_param(asoc, param);
2648 case SCTP_PARAM_FWD_TSN_SUPPORT:
2649 if (asoc->prsctp_enable) {
2650 asoc->peer.prsctp_capable = 1;
2656 case SCTP_PARAM_RANDOM:
2657 if (!ep->auth_enable)
2660 /* Save peer's random parameter */
2661 asoc->peer.peer_random = kmemdup(param.p,
2662 ntohs(param.p->length), gfp);
2663 if (!asoc->peer.peer_random) {
2669 case SCTP_PARAM_HMAC_ALGO:
2670 if (!ep->auth_enable)
2673 /* Save peer's HMAC list */
2674 asoc->peer.peer_hmacs = kmemdup(param.p,
2675 ntohs(param.p->length), gfp);
2676 if (!asoc->peer.peer_hmacs) {
2681 /* Set the default HMAC the peer requested*/
2682 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2685 case SCTP_PARAM_CHUNKS:
2686 if (!ep->auth_enable)
2689 asoc->peer.peer_chunks = kmemdup(param.p,
2690 ntohs(param.p->length), gfp);
2691 if (!asoc->peer.peer_chunks)
2696 /* Any unrecognized parameters should have been caught
2697 * and handled by sctp_verify_param() which should be
2698 * called prior to this routine. Simply log the error
2701 pr_debug("%s: ignoring param:%d for association:%p.\n",
2702 __func__, ntohs(param.p->type), asoc);
2709 /* Select a new verification tag. */
2710 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2712 /* I believe that this random number generator complies with RFC1750.
2713 * A tag of 0 is reserved for special cases (e.g. INIT).
2718 get_random_bytes(&x, sizeof(__u32));
2724 /* Select an initial TSN to send during startup. */
2725 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2729 get_random_bytes(&retval, sizeof(__u32));
2734 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2736 * 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
2737 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2738 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2739 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2741 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2742 * | Address Parameter |
2743 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2744 * | ASCONF Parameter #1 |
2745 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2750 * | ASCONF Parameter #N |
2751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2753 * Address Parameter and other parameter will not be wrapped in this function
2755 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2756 union sctp_addr *addr,
2759 sctp_addiphdr_t asconf;
2760 struct sctp_chunk *retval;
2761 int length = sizeof(asconf) + vparam_len;
2762 union sctp_addr_param addrparam;
2764 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2766 addrlen = af->to_addr_param(addr, &addrparam);
2771 /* Create the chunk. */
2772 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2777 asconf.serial = htonl(asoc->addip_serial++);
2779 retval->subh.addip_hdr =
2780 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2781 retval->param_hdr.v =
2782 sctp_addto_chunk(retval, addrlen, &addrparam);
2788 * 3.2.1 Add IP Address
2790 * 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
2791 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2792 * | Type = 0xC001 | Length = Variable |
2793 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2794 * | ASCONF-Request Correlation ID |
2795 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2796 * | Address Parameter |
2797 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2799 * 3.2.2 Delete IP Address
2801 * 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
2802 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2803 * | Type = 0xC002 | Length = Variable |
2804 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2805 * | ASCONF-Request Correlation ID |
2806 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2807 * | Address Parameter |
2808 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2811 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2812 union sctp_addr *laddr,
2813 struct sockaddr *addrs,
2817 sctp_addip_param_t param;
2818 struct sctp_chunk *retval;
2819 union sctp_addr_param addr_param;
2820 union sctp_addr *addr;
2823 int paramlen = sizeof(param);
2824 int addr_param_len = 0;
2829 /* Get total length of all the address parameters. */
2831 for (i = 0; i < addrcnt; i++) {
2833 af = sctp_get_af_specific(addr->v4.sin_family);
2834 addr_param_len = af->to_addr_param(addr, &addr_param);
2836 totallen += paramlen;
2837 totallen += addr_param_len;
2839 addr_buf += af->sockaddr_len;
2840 if (asoc->asconf_addr_del_pending && !del_pickup) {
2841 /* reuse the parameter length from the same scope one */
2842 totallen += paramlen;
2843 totallen += addr_param_len;
2846 pr_debug("%s: picked same-scope del_pending addr, "
2847 "totallen for all addresses is %d\n",
2848 __func__, totallen);
2852 /* Create an asconf chunk with the required length. */
2853 retval = sctp_make_asconf(asoc, laddr, totallen);
2857 /* Add the address parameters to the asconf chunk. */
2859 for (i = 0; i < addrcnt; i++) {
2861 af = sctp_get_af_specific(addr->v4.sin_family);
2862 addr_param_len = af->to_addr_param(addr, &addr_param);
2863 param.param_hdr.type = flags;
2864 param.param_hdr.length = htons(paramlen + addr_param_len);
2867 sctp_addto_chunk(retval, paramlen, ¶m);
2868 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2870 addr_buf += af->sockaddr_len;
2872 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2873 addr = asoc->asconf_addr_del_pending;
2874 af = sctp_get_af_specific(addr->v4.sin_family);
2875 addr_param_len = af->to_addr_param(addr, &addr_param);
2876 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2877 param.param_hdr.length = htons(paramlen + addr_param_len);
2880 sctp_addto_chunk(retval, paramlen, ¶m);
2881 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2887 * 3.2.4 Set Primary IP Address
2889 * 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
2890 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2891 * | Type =0xC004 | Length = Variable |
2892 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2893 * | ASCONF-Request Correlation ID |
2894 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2895 * | Address Parameter |
2896 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2898 * Create an ASCONF chunk with Set Primary IP address parameter.
2900 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2901 union sctp_addr *addr)
2903 sctp_addip_param_t param;
2904 struct sctp_chunk *retval;
2905 int len = sizeof(param);
2906 union sctp_addr_param addrparam;
2908 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2910 addrlen = af->to_addr_param(addr, &addrparam);
2915 /* Create the chunk and make asconf header. */
2916 retval = sctp_make_asconf(asoc, addr, len);
2920 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2921 param.param_hdr.length = htons(len);
2924 sctp_addto_chunk(retval, sizeof(param), ¶m);
2925 sctp_addto_chunk(retval, addrlen, &addrparam);
2930 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2932 * 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
2933 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2934 * | Type = 0x80 | Chunk Flags | Chunk Length |
2935 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2937 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2938 * | ASCONF Parameter Response#1 |
2939 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2943 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2944 * | ASCONF Parameter Response#N |
2945 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2947 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2949 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2950 __u32 serial, int vparam_len)
2952 sctp_addiphdr_t asconf;
2953 struct sctp_chunk *retval;
2954 int length = sizeof(asconf) + vparam_len;
2956 /* Create the chunk. */
2957 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2962 asconf.serial = htonl(serial);
2964 retval->subh.addip_hdr =
2965 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2970 /* Add response parameters to an ASCONF_ACK chunk. */
2971 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2972 __be16 err_code, sctp_addip_param_t *asconf_param)
2974 sctp_addip_param_t ack_param;
2975 sctp_errhdr_t err_param;
2976 int asconf_param_len = 0;
2977 int err_param_len = 0;
2978 __be16 response_type;
2980 if (SCTP_ERROR_NO_ERROR == err_code) {
2981 response_type = SCTP_PARAM_SUCCESS_REPORT;
2983 response_type = SCTP_PARAM_ERR_CAUSE;
2984 err_param_len = sizeof(err_param);
2987 ntohs(asconf_param->param_hdr.length);
2990 /* Add Success Indication or Error Cause Indication parameter. */
2991 ack_param.param_hdr.type = response_type;
2992 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2995 ack_param.crr_id = crr_id;
2996 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2998 if (SCTP_ERROR_NO_ERROR == err_code)
3001 /* Add Error Cause parameter. */
3002 err_param.cause = err_code;
3003 err_param.length = htons(err_param_len + asconf_param_len);
3004 sctp_addto_chunk(chunk, err_param_len, &err_param);
3006 /* Add the failed TLV copied from ASCONF chunk. */
3008 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3011 /* Process a asconf parameter. */
3012 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3013 struct sctp_chunk *asconf,
3014 sctp_addip_param_t *asconf_param)
3016 struct sctp_transport *peer;
3018 union sctp_addr addr;
3019 union sctp_addr_param *addr_param;
3021 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
3023 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3024 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3025 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3026 return SCTP_ERROR_UNKNOWN_PARAM;
3028 switch (addr_param->p.type) {
3029 case SCTP_PARAM_IPV6_ADDRESS:
3030 if (!asoc->peer.ipv6_address)
3031 return SCTP_ERROR_DNS_FAILED;
3033 case SCTP_PARAM_IPV4_ADDRESS:
3034 if (!asoc->peer.ipv4_address)
3035 return SCTP_ERROR_DNS_FAILED;
3038 return SCTP_ERROR_DNS_FAILED;
3041 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3043 return SCTP_ERROR_DNS_FAILED;
3045 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
3047 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3048 * or multicast address.
3049 * (note: wildcard is permitted and requires special handling so
3050 * make sure we check for that)
3052 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3053 return SCTP_ERROR_DNS_FAILED;
3055 switch (asconf_param->param_hdr.type) {
3056 case SCTP_PARAM_ADD_IP:
3058 * If the address 0.0.0.0 or ::0 is provided, the source
3059 * address of the packet MUST be added.
3061 if (af->is_any(&addr))
3062 memcpy(&addr, &asconf->source, sizeof(addr));
3064 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3065 * request and does not have the local resources to add this
3066 * new address to the association, it MUST return an Error
3067 * Cause TLV set to the new error code 'Operation Refused
3068 * Due to Resource Shortage'.
3071 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3073 return SCTP_ERROR_RSRC_LOW;
3075 /* Start the heartbeat timer. */
3076 sctp_transport_reset_hb_timer(peer);
3077 asoc->new_transport = peer;
3079 case SCTP_PARAM_DEL_IP:
3080 /* ADDIP 4.3 D7) If a request is received to delete the
3081 * last remaining IP address of a peer endpoint, the receiver
3082 * MUST send an Error Cause TLV with the error cause set to the
3083 * new error code 'Request to Delete Last Remaining IP Address'.
3085 if (asoc->peer.transport_count == 1)
3086 return SCTP_ERROR_DEL_LAST_IP;
3088 /* ADDIP 4.3 D8) If a request is received to delete an IP
3089 * address which is also the source address of the IP packet
3090 * which contained the ASCONF chunk, the receiver MUST reject
3091 * this request. To reject the request the receiver MUST send
3092 * an Error Cause TLV set to the new error code 'Request to
3093 * Delete Source IP Address'
3095 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3096 return SCTP_ERROR_DEL_SRC_IP;
3099 * If the address 0.0.0.0 or ::0 is provided, all
3100 * addresses of the peer except the source address of the
3101 * packet MUST be deleted.
3103 if (af->is_any(&addr)) {
3104 sctp_assoc_set_primary(asoc, asconf->transport);
3105 sctp_assoc_del_nonprimary_peers(asoc,
3107 return SCTP_ERROR_NO_ERROR;
3110 /* If the address is not part of the association, the
3111 * ASCONF-ACK with Error Cause Indication Parameter
3112 * which including cause of Unresolvable Address should
3115 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3117 return SCTP_ERROR_DNS_FAILED;
3119 sctp_assoc_rm_peer(asoc, peer);
3121 case SCTP_PARAM_SET_PRIMARY:
3122 /* ADDIP Section 4.2.4
3123 * If the address 0.0.0.0 or ::0 is provided, the receiver
3124 * MAY mark the source address of the packet as its
3127 if (af->is_any(&addr))
3128 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3130 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3132 return SCTP_ERROR_DNS_FAILED;
3134 sctp_assoc_set_primary(asoc, peer);
3138 return SCTP_ERROR_NO_ERROR;
3141 /* Verify the ASCONF packet before we process it. */
3142 bool sctp_verify_asconf(const struct sctp_association *asoc,
3143 struct sctp_chunk *chunk, bool addr_param_needed,
3144 struct sctp_paramhdr **errp)
3146 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr;
3147 union sctp_params param;
3148 bool addr_param_seen = false;
3150 sctp_walk_params(param, addip, addip_hdr.params) {
3151 size_t length = ntohs(param.p->length);
3154 switch (param.p->type) {
3155 case SCTP_PARAM_ERR_CAUSE:
3157 case SCTP_PARAM_IPV4_ADDRESS:
3158 if (length != sizeof(sctp_ipv4addr_param_t))
3160 /* ensure there is only one addr param and it's in the
3161 * beginning of addip_hdr params, or we reject it.
3163 if (param.v != addip->addip_hdr.params)
3165 addr_param_seen = true;
3167 case SCTP_PARAM_IPV6_ADDRESS:
3168 if (length != sizeof(sctp_ipv6addr_param_t))
3170 if (param.v != addip->addip_hdr.params)
3172 addr_param_seen = true;
3174 case SCTP_PARAM_ADD_IP:
3175 case SCTP_PARAM_DEL_IP:
3176 case SCTP_PARAM_SET_PRIMARY:
3177 /* In ASCONF chunks, these need to be first. */
3178 if (addr_param_needed && !addr_param_seen)
3180 length = ntohs(param.addip->param_hdr.length);
3181 if (length < sizeof(sctp_addip_param_t) +
3182 sizeof(sctp_paramhdr_t))
3185 case SCTP_PARAM_SUCCESS_REPORT:
3186 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3187 if (length != sizeof(sctp_addip_param_t))
3191 /* This is unkown to us, reject! */
3196 /* Remaining sanity checks. */
3197 if (addr_param_needed && !addr_param_seen)
3199 if (!addr_param_needed && addr_param_seen)
3201 if (param.v != chunk->chunk_end)
3207 /* Process an incoming ASCONF chunk with the next expected serial no. and
3208 * return an ASCONF_ACK chunk to be sent in response.
3210 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3211 struct sctp_chunk *asconf)
3213 sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr;
3214 bool all_param_pass = true;
3215 union sctp_params param;
3216 sctp_addiphdr_t *hdr;
3217 union sctp_addr_param *addr_param;
3218 struct sctp_chunk *asconf_ack;
3224 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
3225 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3226 serial = ntohl(hdr->serial);
3228 /* Skip the addiphdr and store a pointer to address parameter. */
3229 length = sizeof(sctp_addiphdr_t);
3230 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3231 chunk_len -= length;
3233 /* Skip the address parameter and store a pointer to the first
3236 length = ntohs(addr_param->p.length);
3237 chunk_len -= length;
3239 /* create an ASCONF_ACK chunk.
3240 * Based on the definitions of parameters, we know that the size of
3241 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3244 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3248 /* Process the TLVs contained within the ASCONF chunk. */
3249 sctp_walk_params(param, addip, addip_hdr.params) {
3250 /* Skip preceeding address parameters. */
3251 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3252 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3255 err_code = sctp_process_asconf_param(asoc, asconf,
3258 * If an error response is received for a TLV parameter,
3259 * all TLVs with no response before the failed TLV are
3260 * considered successful if not reported. All TLVs after
3261 * the failed response are considered unsuccessful unless
3262 * a specific success indication is present for the parameter.
3264 if (err_code != SCTP_ERROR_NO_ERROR)
3265 all_param_pass = false;
3266 if (!all_param_pass)
3267 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3268 err_code, param.addip);
3270 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3271 * an IP address sends an 'Out of Resource' in its response, it
3272 * MUST also fail any subsequent add or delete requests bundled
3275 if (err_code == SCTP_ERROR_RSRC_LOW)
3279 asoc->peer.addip_serial++;
3281 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3282 * after freeing the reference to old asconf ack if any.
3285 sctp_chunk_hold(asconf_ack);
3286 list_add_tail(&asconf_ack->transmitted_list,
3287 &asoc->asconf_ack_list);
3293 /* Process a asconf parameter that is successfully acked. */
3294 static void sctp_asconf_param_success(struct sctp_association *asoc,
3295 sctp_addip_param_t *asconf_param)
3298 union sctp_addr addr;
3299 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3300 union sctp_addr_param *addr_param;
3301 struct sctp_transport *transport;
3302 struct sctp_sockaddr_entry *saddr;
3304 addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t);
3306 /* We have checked the packet before, so we do not check again. */
3307 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3308 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
3310 switch (asconf_param->param_hdr.type) {
3311 case SCTP_PARAM_ADD_IP:
3312 /* This is always done in BH context with a socket lock
3313 * held, so the list can not change.
3316 list_for_each_entry(saddr, &bp->address_list, list) {
3317 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3318 saddr->state = SCTP_ADDR_SRC;
3321 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3323 sctp_transport_dst_release(transport);
3326 case SCTP_PARAM_DEL_IP:
3328 sctp_del_bind_addr(bp, &addr);
3329 if (asoc->asconf_addr_del_pending != NULL &&
3330 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3331 kfree(asoc->asconf_addr_del_pending);
3332 asoc->asconf_addr_del_pending = NULL;
3335 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3337 sctp_transport_dst_release(transport);
3345 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3346 * for the given asconf parameter. If there is no response for this parameter,
3347 * return the error code based on the third argument 'no_err'.
3349 * A7) If an error response is received for a TLV parameter, all TLVs with no
3350 * response before the failed TLV are considered successful if not reported.
3351 * All TLVs after the failed response are considered unsuccessful unless a
3352 * specific success indication is present for the parameter.
3354 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3355 sctp_addip_param_t *asconf_param,
3358 sctp_addip_param_t *asconf_ack_param;
3359 sctp_errhdr_t *err_param;
3365 err_code = SCTP_ERROR_NO_ERROR;
3367 err_code = SCTP_ERROR_REQ_REFUSED;
3369 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3370 sizeof(sctp_chunkhdr_t);
3372 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3373 * the first asconf_ack parameter.
3375 length = sizeof(sctp_addiphdr_t);
3376 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3378 asconf_ack_len -= length;
3380 while (asconf_ack_len > 0) {
3381 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3382 switch (asconf_ack_param->param_hdr.type) {
3383 case SCTP_PARAM_SUCCESS_REPORT:
3384 return SCTP_ERROR_NO_ERROR;
3385 case SCTP_PARAM_ERR_CAUSE:
3386 length = sizeof(sctp_addip_param_t);
3387 err_param = (void *)asconf_ack_param + length;
3388 asconf_ack_len -= length;
3389 if (asconf_ack_len > 0)
3390 return err_param->cause;
3392 return SCTP_ERROR_INV_PARAM;
3395 return SCTP_ERROR_INV_PARAM;
3399 length = ntohs(asconf_ack_param->param_hdr.length);
3400 asconf_ack_param = (void *)asconf_ack_param + length;
3401 asconf_ack_len -= length;
3407 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3408 int sctp_process_asconf_ack(struct sctp_association *asoc,
3409 struct sctp_chunk *asconf_ack)
3411 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3412 union sctp_addr_param *addr_param;
3413 sctp_addip_param_t *asconf_param;
3415 int asconf_len = asconf->skb->len;
3416 int all_param_pass = 0;
3419 __be16 err_code = SCTP_ERROR_NO_ERROR;
3421 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3422 * a pointer to address parameter.
3424 length = sizeof(sctp_addip_chunk_t);
3425 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3426 asconf_len -= length;
3428 /* Skip the address parameter in the last asconf sent and store a
3429 * pointer to the first asconf parameter.
3431 length = ntohs(addr_param->p.length);
3432 asconf_param = (void *)addr_param + length;
3433 asconf_len -= length;
3436 * A8) If there is no response(s) to specific TLV parameter(s), and no
3437 * failures are indicated, then all request(s) are considered
3440 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3443 /* Process the TLVs contained in the last sent ASCONF chunk. */
3444 while (asconf_len > 0) {
3446 err_code = SCTP_ERROR_NO_ERROR;
3448 err_code = sctp_get_asconf_response(asconf_ack,
3451 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3456 case SCTP_ERROR_NO_ERROR:
3457 sctp_asconf_param_success(asoc, asconf_param);
3460 case SCTP_ERROR_RSRC_LOW:
3464 case SCTP_ERROR_UNKNOWN_PARAM:
3465 /* Disable sending this type of asconf parameter in
3468 asoc->peer.addip_disabled_mask |=
3469 asconf_param->param_hdr.type;
3472 case SCTP_ERROR_REQ_REFUSED:
3473 case SCTP_ERROR_DEL_LAST_IP:
3474 case SCTP_ERROR_DEL_SRC_IP:
3479 /* Skip the processed asconf parameter and move to the next
3482 length = ntohs(asconf_param->param_hdr.length);
3483 asconf_param = (void *)asconf_param + length;
3484 asconf_len -= length;
3487 if (no_err && asoc->src_out_of_asoc_ok) {
3488 asoc->src_out_of_asoc_ok = 0;
3489 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3492 /* Free the cached last sent asconf chunk. */
3493 list_del_init(&asconf->transmitted_list);
3494 sctp_chunk_free(asconf);
3495 asoc->addip_last_asconf = NULL;
3500 /* Make a FWD TSN chunk. */
3501 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3502 __u32 new_cum_tsn, size_t nstreams,
3503 struct sctp_fwdtsn_skip *skiplist)
3505 struct sctp_chunk *retval = NULL;
3506 struct sctp_fwdtsn_hdr ftsn_hdr;
3507 struct sctp_fwdtsn_skip skip;
3511 hint = (nstreams + 1) * sizeof(__u32);
3513 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3518 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3519 retval->subh.fwdtsn_hdr =
3520 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3522 for (i = 0; i < nstreams; i++) {
3523 skip.stream = skiplist[i].stream;
3524 skip.ssn = skiplist[i].ssn;
3525 sctp_addto_chunk(retval, sizeof(skip), &skip);
3531 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3533 * 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
3534 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3535 * | Type = 130 | Chunk Flags | Chunk Length |
3536 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3538 * / Re-configuration Parameter /
3540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3542 * / Re-configuration Parameter (optional) /
3544 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3546 static struct sctp_chunk *sctp_make_reconf(
3547 const struct sctp_association *asoc,
3550 struct sctp_reconf_chunk *reconf;
3551 struct sctp_chunk *retval;
3553 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3558 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3559 retval->param_hdr.v = reconf->params;
3564 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3566 * 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
3567 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3568 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3569 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3570 * | Re-configuration Request Sequence Number |
3571 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3572 * | Re-configuration Response Sequence Number |
3573 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3574 * | Sender's Last Assigned TSN |
3575 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3576 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3577 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3579 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3580 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3581 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3583 * RE-CONFIG 4.2 (STREAM IN RESET)
3585 * 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
3586 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3587 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3588 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3589 * | Re-configuration Request Sequence Number |
3590 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3591 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3592 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3594 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3595 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3596 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3598 struct sctp_chunk *sctp_make_strreset_req(
3599 const struct sctp_association *asoc,
3600 __u16 stream_num, __u16 *stream_list,
3603 struct sctp_strreset_outreq outreq;
3604 __u16 stream_len = stream_num * 2;
3605 struct sctp_strreset_inreq inreq;
3606 struct sctp_chunk *retval;
3607 __u16 outlen, inlen;
3609 outlen = (sizeof(outreq) + stream_len) * out;
3610 inlen = (sizeof(inreq) + stream_len) * in;
3612 retval = sctp_make_reconf(asoc, outlen + inlen);
3617 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3618 outreq.param_hdr.length = htons(outlen);
3619 outreq.request_seq = htonl(asoc->strreset_outseq);
3620 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3621 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3623 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3626 sctp_addto_chunk(retval, stream_len, stream_list);
3630 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3631 inreq.param_hdr.length = htons(inlen);
3632 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3634 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3637 sctp_addto_chunk(retval, stream_len, stream_list);
3643 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3645 * 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
3646 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3647 * | Parameter Type = 15 | Parameter Length = 8 |
3648 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3649 * | Re-configuration Request Sequence Number |
3650 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3652 struct sctp_chunk *sctp_make_strreset_tsnreq(
3653 const struct sctp_association *asoc)
3655 struct sctp_strreset_tsnreq tsnreq;
3656 __u16 length = sizeof(tsnreq);
3657 struct sctp_chunk *retval;
3659 retval = sctp_make_reconf(asoc, length);
3663 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3664 tsnreq.param_hdr.length = htons(length);
3665 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3667 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3672 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3674 * 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
3675 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3676 * | Parameter Type = 17 | Parameter Length = 12 |
3677 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3678 * | Re-configuration Request Sequence Number |
3679 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3680 * | Number of new streams | Reserved |
3681 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3683 struct sctp_chunk *sctp_make_strreset_addstrm(
3684 const struct sctp_association *asoc,
3685 __u16 out, __u16 in)
3687 struct sctp_strreset_addstrm addstrm;
3688 __u16 size = sizeof(addstrm);
3689 struct sctp_chunk *retval;
3691 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3696 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3697 addstrm.param_hdr.length = htons(size);
3698 addstrm.number_of_streams = htons(out);
3699 addstrm.request_seq = htonl(asoc->strreset_outseq);
3700 addstrm.reserved = 0;
3702 sctp_addto_chunk(retval, size, &addstrm);
3706 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3707 addstrm.param_hdr.length = htons(size);
3708 addstrm.number_of_streams = htons(in);
3709 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3710 addstrm.reserved = 0;
3712 sctp_addto_chunk(retval, size, &addstrm);
3718 /* RE-CONFIG 4.4 (RESP)
3720 * 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
3721 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3722 * | Parameter Type = 16 | Parameter Length |
3723 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3724 * | Re-configuration Response Sequence Number |
3725 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3727 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3729 struct sctp_chunk *sctp_make_strreset_resp(
3730 const struct sctp_association *asoc,
3731 __u32 result, __u32 sn)
3733 struct sctp_strreset_resp resp;
3734 __u16 length = sizeof(resp);
3735 struct sctp_chunk *retval;
3737 retval = sctp_make_reconf(asoc, length);
3741 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3742 resp.param_hdr.length = htons(length);
3743 resp.response_seq = htonl(sn);
3744 resp.result = htonl(result);
3746 sctp_addto_chunk(retval, sizeof(resp), &resp);
3751 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3753 * 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
3754 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3755 * | Parameter Type = 16 | Parameter Length |
3756 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3757 * | Re-configuration Response Sequence Number |
3758 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3760 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3761 * | Sender's Next TSN (optional) |
3762 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3763 * | Receiver's Next TSN (optional) |
3764 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3766 struct sctp_chunk *sctp_make_strreset_tsnresp(
3767 struct sctp_association *asoc,
3768 __u32 result, __u32 sn,
3769 __u32 sender_tsn, __u32 receiver_tsn)
3771 struct sctp_strreset_resptsn tsnresp;
3772 __u16 length = sizeof(tsnresp);
3773 struct sctp_chunk *retval;
3775 retval = sctp_make_reconf(asoc, length);
3779 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3780 tsnresp.param_hdr.length = htons(length);
3782 tsnresp.response_seq = htonl(sn);
3783 tsnresp.result = htonl(result);
3784 tsnresp.senders_next_tsn = htonl(sender_tsn);
3785 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3787 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3792 bool sctp_verify_reconf(const struct sctp_association *asoc,
3793 struct sctp_chunk *chunk,
3794 struct sctp_paramhdr **errp)
3796 struct sctp_reconf_chunk *hdr;
3797 union sctp_params param;
3798 __u16 last = 0, cnt = 0;
3800 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3801 sctp_walk_params(param, hdr, params) {
3802 __u16 length = ntohs(param.p->length);
3807 switch (param.p->type) {
3808 case SCTP_PARAM_RESET_OUT_REQUEST:
3809 if (length < sizeof(struct sctp_strreset_outreq) ||
3810 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3811 last != SCTP_PARAM_RESET_IN_REQUEST))
3814 case SCTP_PARAM_RESET_IN_REQUEST:
3815 if (length < sizeof(struct sctp_strreset_inreq) ||
3816 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3819 case SCTP_PARAM_RESET_RESPONSE:
3820 if ((length != sizeof(struct sctp_strreset_resp) &&
3821 length != sizeof(struct sctp_strreset_resptsn)) ||
3822 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3823 last != SCTP_PARAM_RESET_OUT_REQUEST))
3826 case SCTP_PARAM_RESET_TSN_REQUEST:
3828 sizeof(struct sctp_strreset_tsnreq) || last)
3831 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3832 if (length != sizeof(struct sctp_strreset_addstrm) ||
3833 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3836 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3837 if (length != sizeof(struct sctp_strreset_addstrm) ||
3838 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3845 last = param.p->type;