1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2002 Intel Corp.
8 * This file is part of the SCTP kernel implementation
10 * These functions work with the state functions in sctp_sm_statefuns.c
11 * to implement the state operations. These functions implement the
12 * steps which require modifying existing data structures.
14 * Please send any bug reports or fixes you make to the
16 * lksctp developers <linux-sctp@vger.kernel.org>
18 * Written or modified by:
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Karl Knutson <karl@athena.chicago.il.us>
21 * C. Robin <chris@hundredacre.ac.uk>
22 * Jon Grimm <jgrimm@us.ibm.com>
23 * Xingang Guo <xingang.guo@intel.com>
24 * Dajiang Zhang <dajiang.zhang@nokia.com>
25 * Sridhar Samudrala <sri@us.ibm.com>
26 * Daisy Chang <daisyc@us.ibm.com>
27 * Ardelle Fan <ardelle.fan@intel.com>
28 * Kevin Gao <kevin.gao@intel.com>
31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33 #include <crypto/hash.h>
34 #include <linux/types.h>
35 #include <linux/kernel.h>
37 #include <linux/ipv6.h>
38 #include <linux/net.h>
39 #include <linux/inet.h>
40 #include <linux/scatterlist.h>
41 #include <linux/slab.h>
44 #include <linux/skbuff.h>
45 #include <linux/random.h> /* for get_random_bytes */
46 #include <net/sctp/sctp.h>
47 #include <net/sctp/sm.h>
49 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
50 __u8 type, __u8 flags, int paylen,
52 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
53 __u8 flags, int paylen, gfp_t gfp);
54 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
55 __u8 type, __u8 flags, int paylen,
57 static struct sctp_cookie_param *sctp_pack_cookie(
58 const struct sctp_endpoint *ep,
59 const struct sctp_association *asoc,
60 const struct sctp_chunk *init_chunk,
62 const __u8 *raw_addrs, int addrs_len);
63 static int sctp_process_param(struct sctp_association *asoc,
64 union sctp_params param,
65 const union sctp_addr *peer_addr,
67 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
70 /* Control chunk destructor */
71 static void sctp_control_release_owner(struct sk_buff *skb)
73 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
76 struct sctp_shared_key *shkey = chunk->shkey;
77 struct sctp_association *asoc = chunk->asoc;
79 /* refcnt == 2 and !list_empty mean after this release, it's
80 * not being used anywhere, and it's time to notify userland
81 * that this shkey can be freed if it's been deactivated.
83 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
84 refcount_read(&shkey->refcnt) == 2) {
85 struct sctp_ulpevent *ev;
87 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
91 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
93 sctp_auth_shkey_release(chunk->shkey);
97 static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
99 struct sctp_association *asoc = chunk->asoc;
100 struct sk_buff *skb = chunk->skb;
102 /* TODO: properly account for control chunks.
103 * To do it right we'll need:
104 * 1) endpoint if association isn't known.
105 * 2) proper memory accounting.
107 * For now don't do anything for now.
110 chunk->shkey = asoc->shkey;
111 sctp_auth_shkey_hold(chunk->shkey);
113 skb->sk = asoc ? asoc->base.sk : NULL;
114 skb_shinfo(skb)->destructor_arg = chunk;
115 skb->destructor = sctp_control_release_owner;
118 /* What was the inbound interface for this chunk? */
119 int sctp_chunk_iif(const struct sctp_chunk *chunk)
121 struct sk_buff *skb = chunk->skb;
123 return SCTP_INPUT_CB(skb)->af->skb_iif(skb);
126 /* RFC 2960 3.3.2 Initiation (INIT) (1)
128 * Note 2: The ECN capable field is reserved for future use of
129 * Explicit Congestion Notification.
131 static const struct sctp_paramhdr ecap_param = {
132 SCTP_PARAM_ECN_CAPABLE,
133 cpu_to_be16(sizeof(struct sctp_paramhdr)),
135 static const struct sctp_paramhdr prsctp_param = {
136 SCTP_PARAM_FWD_TSN_SUPPORT,
137 cpu_to_be16(sizeof(struct sctp_paramhdr)),
140 /* A helper to initialize an op error inside a provided chunk, as most
141 * cause codes will be embedded inside an abort chunk.
143 int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
146 struct sctp_errhdr err;
149 /* Cause code constants are now defined in network order. */
150 err.cause = cause_code;
151 len = sizeof(err) + paylen;
152 err.length = htons(len);
154 if (skb_tailroom(chunk->skb) < len)
157 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err);
162 /* 3.3.2 Initiation (INIT) (1)
164 * This chunk is used to initiate a SCTP association between two
165 * endpoints. The format of the INIT chunk is shown below:
168 * 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
169 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
170 * | Type = 1 | Chunk Flags | Chunk Length |
171 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
173 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
174 * | Advertised Receiver Window Credit (a_rwnd) |
175 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
176 * | Number of Outbound Streams | Number of Inbound Streams |
177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
181 * / Optional/Variable-Length Parameters /
183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
186 * The INIT chunk contains the following parameters. Unless otherwise
187 * noted, each parameter MUST only be included once in the INIT chunk.
189 * Fixed Parameters Status
190 * ----------------------------------------------
191 * Initiate Tag Mandatory
192 * Advertised Receiver Window Credit Mandatory
193 * Number of Outbound Streams Mandatory
194 * Number of Inbound Streams Mandatory
195 * Initial TSN Mandatory
197 * Variable Parameters Status Type Value
198 * -------------------------------------------------------------
199 * IPv4 Address (Note 1) Optional 5
200 * IPv6 Address (Note 1) Optional 6
201 * Cookie Preservative Optional 9
202 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
203 * Host Name Address (Note 3) Optional 11
204 * Supported Address Types (Note 4) Optional 12
206 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
207 const struct sctp_bind_addr *bp,
208 gfp_t gfp, int vparam_len)
210 struct sctp_supported_ext_param ext_param;
211 struct sctp_adaptation_ind_param aiparam;
212 struct sctp_paramhdr *auth_chunks = NULL;
213 struct sctp_paramhdr *auth_hmacs = NULL;
214 struct sctp_supported_addrs_param sat;
215 struct sctp_endpoint *ep = asoc->ep;
216 struct sctp_chunk *retval = NULL;
217 int num_types, addrs_len = 0;
218 struct sctp_inithdr init;
219 union sctp_params addrs;
220 struct sctp_sock *sp;
226 /* RFC 2960 3.3.2 Initiation (INIT) (1)
228 * Note 1: The INIT chunks can contain multiple addresses that
229 * can be IPv4 and/or IPv6 in any combination.
232 /* Convert the provided bind address list to raw format. */
233 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
235 init.init_tag = htonl(asoc->c.my_vtag);
236 init.a_rwnd = htonl(asoc->rwnd);
237 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
238 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
239 init.initial_tsn = htonl(asoc->c.initial_tsn);
241 /* How many address types are needed? */
242 sp = sctp_sk(asoc->base.sk);
243 num_types = sp->pf->supported_addrs(sp, types);
245 chunksize = sizeof(init) + addrs_len;
246 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
248 if (asoc->ep->ecn_enable)
249 chunksize += sizeof(ecap_param);
251 if (asoc->ep->prsctp_enable)
252 chunksize += sizeof(prsctp_param);
254 /* ADDIP: Section 4.2.7:
255 * An implementation supporting this extension [ADDIP] MUST list
256 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
257 * INIT-ACK parameters.
259 if (asoc->ep->asconf_enable) {
260 extensions[num_ext] = SCTP_CID_ASCONF;
261 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
265 if (asoc->ep->reconf_enable) {
266 extensions[num_ext] = SCTP_CID_RECONF;
270 if (sp->adaptation_ind)
271 chunksize += sizeof(aiparam);
273 if (asoc->ep->intl_enable) {
274 extensions[num_ext] = SCTP_CID_I_DATA;
278 chunksize += vparam_len;
280 /* Account for AUTH related parameters */
281 if (ep->auth_enable) {
282 /* Add random parameter length*/
283 chunksize += sizeof(asoc->c.auth_random);
285 /* Add HMACS parameter length if any were defined */
286 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
287 if (auth_hmacs->length)
288 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
292 /* Add CHUNKS parameter length */
293 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
294 if (auth_chunks->length)
295 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
299 extensions[num_ext] = SCTP_CID_AUTH;
303 /* If we have any extensions to report, account for that */
305 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
307 /* RFC 2960 3.3.2 Initiation (INIT) (1)
309 * Note 3: An INIT chunk MUST NOT contain more than one Host
310 * Name address parameter. Moreover, the sender of the INIT
311 * MUST NOT combine any other address types with the Host Name
312 * address in the INIT. The receiver of INIT MUST ignore any
313 * other address types if the Host Name address parameter is
314 * present in the received INIT chunk.
316 * PLEASE DO NOT FIXME [This version does not support Host Name.]
319 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
323 retval->subh.init_hdr =
324 sctp_addto_chunk(retval, sizeof(init), &init);
325 retval->param_hdr.v =
326 sctp_addto_chunk(retval, addrs_len, addrs.v);
328 /* RFC 2960 3.3.2 Initiation (INIT) (1)
330 * Note 4: This parameter, when present, specifies all the
331 * address types the sending endpoint can support. The absence
332 * of this parameter indicates that the sending endpoint can
333 * support any address type.
335 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
336 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
337 sctp_addto_chunk(retval, sizeof(sat), &sat);
338 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
340 if (asoc->ep->ecn_enable)
341 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
343 /* Add the supported extensions parameter. Be nice and add this
344 * fist before addiding the parameters for the extensions themselves
347 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
348 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
349 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
350 sctp_addto_param(retval, num_ext, extensions);
353 if (asoc->ep->prsctp_enable)
354 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
356 if (sp->adaptation_ind) {
357 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
358 aiparam.param_hdr.length = htons(sizeof(aiparam));
359 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
360 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
363 /* Add SCTP-AUTH chunks to the parameter list */
364 if (ep->auth_enable) {
365 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
366 asoc->c.auth_random);
368 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
371 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
379 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
380 const struct sctp_chunk *chunk,
381 gfp_t gfp, int unkparam_len)
383 struct sctp_supported_ext_param ext_param;
384 struct sctp_adaptation_ind_param aiparam;
385 struct sctp_paramhdr *auth_chunks = NULL;
386 struct sctp_paramhdr *auth_random = NULL;
387 struct sctp_paramhdr *auth_hmacs = NULL;
388 struct sctp_chunk *retval = NULL;
389 struct sctp_cookie_param *cookie;
390 struct sctp_inithdr initack;
391 union sctp_params addrs;
392 struct sctp_sock *sp;
399 /* Note: there may be no addresses to embed. */
400 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
402 initack.init_tag = htonl(asoc->c.my_vtag);
403 initack.a_rwnd = htonl(asoc->rwnd);
404 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
405 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
406 initack.initial_tsn = htonl(asoc->c.initial_tsn);
408 /* FIXME: We really ought to build the cookie right
409 * into the packet instead of allocating more fresh memory.
411 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
416 /* Calculate the total size of allocation, include the reserved
417 * space for reporting unknown parameters if it is specified.
419 sp = sctp_sk(asoc->base.sk);
420 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
422 /* Tell peer that we'll do ECN only if peer advertised such cap. */
423 if (asoc->peer.ecn_capable)
424 chunksize += sizeof(ecap_param);
426 if (asoc->peer.prsctp_capable)
427 chunksize += sizeof(prsctp_param);
429 if (asoc->peer.asconf_capable) {
430 extensions[num_ext] = SCTP_CID_ASCONF;
431 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
435 if (asoc->peer.reconf_capable) {
436 extensions[num_ext] = SCTP_CID_RECONF;
440 if (sp->adaptation_ind)
441 chunksize += sizeof(aiparam);
443 if (asoc->peer.intl_capable) {
444 extensions[num_ext] = SCTP_CID_I_DATA;
448 if (asoc->peer.auth_capable) {
449 auth_random = (struct sctp_paramhdr *)asoc->c.auth_random;
450 chunksize += ntohs(auth_random->length);
452 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
453 if (auth_hmacs->length)
454 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
458 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
459 if (auth_chunks->length)
460 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
464 extensions[num_ext] = SCTP_CID_AUTH;
469 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
471 /* Now allocate and fill out the chunk. */
472 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
476 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
478 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
479 * HEARTBEAT ACK, * etc.) to the same destination transport
480 * address from which it received the DATA or control chunk
481 * to which it is replying.
483 * [INIT ACK back to where the INIT came from.]
485 if (chunk->transport)
487 sctp_assoc_lookup_paddr(asoc,
488 &chunk->transport->ipaddr);
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 = htons(sizeof(ext_param) + num_ext);
499 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
500 sctp_addto_param(retval, num_ext, extensions);
502 if (asoc->peer.prsctp_capable)
503 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
505 if (sp->adaptation_ind) {
506 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
507 aiparam.param_hdr.length = htons(sizeof(aiparam));
508 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
509 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
512 if (asoc->peer.auth_capable) {
513 sctp_addto_chunk(retval, ntohs(auth_random->length),
516 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
519 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
523 /* We need to remove the const qualifier at this point. */
524 retval->asoc = (struct sctp_association *) asoc;
533 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
535 * This chunk is used only during the initialization of an association.
536 * It is sent by the initiator of an association to its peer to complete
537 * the initialization process. This chunk MUST precede any DATA chunk
538 * sent within the association, but MAY be bundled with one or more DATA
539 * chunks in the same packet.
542 * 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
543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
544 * | Type = 10 |Chunk Flags | Length |
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552 * Set to zero on transmit and ignored on receipt.
554 * Length: 16 bits (unsigned integer)
556 * Set to the size of the chunk in bytes, including the 4 bytes of
557 * the chunk header and the size of the Cookie.
559 * Cookie: variable size
561 * This field must contain the exact cookie received in the
562 * State Cookie parameter from the previous INIT ACK.
564 * An implementation SHOULD make the cookie as small as possible
565 * to insure interoperability.
567 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
568 const struct sctp_chunk *chunk)
570 struct sctp_chunk *retval;
574 cookie = asoc->peer.cookie;
575 cookie_len = asoc->peer.cookie_len;
577 /* Build a cookie echo chunk. */
578 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
579 cookie_len, GFP_ATOMIC);
582 retval->subh.cookie_hdr =
583 sctp_addto_chunk(retval, cookie_len, cookie);
585 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
587 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
588 * HEARTBEAT ACK, * etc.) to the same destination transport
589 * address from which it * received the DATA or control chunk
590 * to which it is replying.
592 * [COOKIE ECHO back to where the INIT ACK came from.]
595 retval->transport = chunk->transport;
601 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
603 * This chunk is used only during the initialization of an
604 * association. It is used to acknowledge the receipt of a COOKIE
605 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
606 * within the association, but MAY be bundled with one or more DATA
607 * chunks or SACK chunk in the same SCTP packet.
610 * 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
611 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
612 * | Type = 11 |Chunk Flags | Length = 4 |
613 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
615 * Chunk Flags: 8 bits
617 * Set to zero on transmit and ignored on receipt.
619 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
620 const struct sctp_chunk *chunk)
622 struct sctp_chunk *retval;
624 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
626 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
628 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
629 * HEARTBEAT ACK, * etc.) to the same destination transport
630 * address from which it * received the DATA or control chunk
631 * to which it is replying.
633 * [COOKIE ACK back to where the COOKIE ECHO came from.]
635 if (retval && chunk && chunk->transport)
637 sctp_assoc_lookup_paddr(asoc,
638 &chunk->transport->ipaddr);
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;
671 struct sctp_cwrhdr cwr;
673 cwr.lowest_tsn = htonl(lowest_tsn);
674 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
675 sizeof(cwr), 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;
705 struct sctp_ecnehdr ecne;
707 ecne.lowest_tsn = htonl(lowest_tsn);
708 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
709 sizeof(ecne), 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(const struct sctp_association *asoc,
723 const struct sctp_sndrcvinfo *sinfo,
724 int len, __u8 flags, gfp_t gfp)
726 struct sctp_chunk *retval;
727 struct sctp_datahdr dp;
729 /* We assign the TSN as LATE as possible, not here when
730 * creating the chunk.
732 memset(&dp, 0, sizeof(dp));
733 dp.ppid = sinfo->sinfo_ppid;
734 dp.stream = htons(sinfo->sinfo_stream);
736 /* Set the flags for an unordered send. */
737 if (sinfo->sinfo_flags & SCTP_UNORDERED)
738 flags |= SCTP_DATA_UNORDERED;
740 retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp);
744 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
745 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
750 /* Create a selective ackowledgement (SACK) for the given
751 * association. This reports on which TSN's we've seen to date,
752 * including duplicates and gaps.
754 struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc)
756 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
757 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
758 __u16 num_gabs, num_dup_tsns;
759 struct sctp_transport *trans;
760 struct sctp_chunk *retval;
761 struct sctp_sackhdr sack;
765 memset(gabs, 0, sizeof(gabs));
766 ctsn = sctp_tsnmap_get_ctsn(map);
768 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
770 /* How much room is needed in the chunk? */
771 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
772 num_dup_tsns = sctp_tsnmap_num_dups(map);
774 /* Initialize the SACK header. */
775 sack.cum_tsn_ack = htonl(ctsn);
776 sack.a_rwnd = htonl(asoc->a_rwnd);
777 sack.num_gap_ack_blocks = htons(num_gabs);
778 sack.num_dup_tsns = htons(num_dup_tsns);
781 + sizeof(struct sctp_gap_ack_block) * num_gabs
782 + sizeof(__u32) * num_dup_tsns;
784 /* Create the chunk. */
785 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
789 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
791 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
792 * HEARTBEAT ACK, etc.) to the same destination transport
793 * address from which it received the DATA or control chunk to
794 * which it is replying. This rule should also be followed if
795 * the endpoint is bundling DATA chunks together with the
798 * However, when acknowledging multiple DATA chunks received
799 * in packets from different source addresses in a single
800 * SACK, the SACK chunk may be transmitted to one of the
801 * destination transport addresses from which the DATA or
802 * control chunks being acknowledged were received.
804 * [BUG: We do not implement the following paragraph.
805 * Perhaps we should remember the last transport we used for a
806 * SACK and avoid that (if possible) if we have seen any
807 * duplicates. --piggy]
809 * When a receiver of a duplicate DATA chunk sends a SACK to a
810 * multi- homed endpoint it MAY be beneficial to vary the
811 * destination address and not use the source address of the
812 * DATA chunk. The reason being that receiving a duplicate
813 * from a multi-homed endpoint might indicate that the return
814 * path (as specified in the source address of the DATA chunk)
815 * for the SACK is broken.
817 * [Send to the address from which we last received a DATA chunk.]
819 retval->transport = asoc->peer.last_data_from;
821 retval->subh.sack_hdr =
822 sctp_addto_chunk(retval, sizeof(sack), &sack);
824 /* Add the gap ack block information. */
826 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
829 /* Add the duplicate TSN information. */
831 asoc->stats.idupchunks += num_dup_tsns;
832 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
833 sctp_tsnmap_get_dups(map));
835 /* Once we have a sack generated, check to see what our sack
836 * generation is, if its 0, reset the transports to 0, and reset
837 * the association generation to 1
839 * The idea is that zero is never used as a valid generation for the
840 * association so no transport will match after a wrap event like this,
841 * Until the next sack
843 if (++asoc->peer.sack_generation == 0) {
844 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
846 trans->sack_generation = 0;
847 asoc->peer.sack_generation = 1;
853 /* Make a SHUTDOWN chunk. */
854 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
855 const struct sctp_chunk *chunk)
857 struct sctp_shutdownhdr shut;
858 struct sctp_chunk *retval;
861 if (chunk && chunk->asoc)
862 ctsn = sctp_tsnmap_get_ctsn(&chunk->asoc->peer.tsn_map);
864 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
866 shut.cum_tsn_ack = htonl(ctsn);
868 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
869 sizeof(shut), GFP_ATOMIC);
873 retval->subh.shutdown_hdr =
874 sctp_addto_chunk(retval, sizeof(shut), &shut);
877 retval->transport = chunk->transport;
882 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
883 const struct sctp_chunk *chunk)
885 struct sctp_chunk *retval;
887 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
890 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
892 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
893 * HEARTBEAT ACK, * etc.) to the same destination transport
894 * address from which it * received the DATA or control chunk
895 * to which it is replying.
897 * [ACK back to where the SHUTDOWN came from.]
900 retval->transport = chunk->transport;
905 struct sctp_chunk *sctp_make_shutdown_complete(
906 const struct sctp_association *asoc,
907 const struct sctp_chunk *chunk)
909 struct sctp_chunk *retval;
912 /* Set the T-bit if we have no association (vtag will be
915 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
917 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
920 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
922 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
923 * HEARTBEAT ACK, * etc.) to the same destination transport
924 * address from which it * received the DATA or control chunk
925 * to which it is replying.
927 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
931 retval->transport = chunk->transport;
936 /* Create an ABORT. Note that we set the T bit if we have no
937 * association, except when responding to an INIT (sctpimpguide 2.41).
939 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
940 const struct sctp_chunk *chunk,
943 struct sctp_chunk *retval;
946 /* Set the T-bit if we have no association and 'chunk' is not
947 * an INIT (vtag will be reflected).
950 if (chunk && chunk->chunk_hdr &&
951 chunk->chunk_hdr->type == SCTP_CID_INIT)
954 flags = SCTP_CHUNK_FLAG_T;
957 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
960 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
962 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
963 * HEARTBEAT ACK, * etc.) to the same destination transport
964 * address from which it * received the DATA or control chunk
965 * to which it is replying.
967 * [ABORT back to where the offender came from.]
970 retval->transport = chunk->transport;
975 /* Helper to create ABORT with a NO_USER_DATA error. */
976 struct sctp_chunk *sctp_make_abort_no_data(
977 const struct sctp_association *asoc,
978 const struct sctp_chunk *chunk,
981 struct sctp_chunk *retval;
984 retval = sctp_make_abort(asoc, chunk,
985 sizeof(struct sctp_errhdr) + sizeof(tsn));
990 /* Put the tsn back into network byte order. */
991 payload = htonl(tsn);
992 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
993 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
995 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
997 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
998 * HEARTBEAT ACK, * etc.) to the same destination transport
999 * address from which it * received the DATA or control chunk
1000 * to which it is replying.
1002 * [ABORT back to where the offender came from.]
1005 retval->transport = chunk->transport;
1011 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1012 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1016 struct sctp_chunk *retval;
1017 void *payload = NULL;
1020 retval = sctp_make_abort(asoc, NULL,
1021 sizeof(struct sctp_errhdr) + paylen);
1026 /* Put the msg_iov together into payload. */
1027 payload = kmalloc(paylen, GFP_KERNEL);
1031 err = memcpy_from_msg(payload, msg, paylen);
1036 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1037 sctp_addto_chunk(retval, paylen, payload);
1047 sctp_chunk_free(retval);
1053 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1056 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1059 int chunklen = ntohs(chunk->chunk_hdr->length);
1062 target = skb_put(chunk->skb, len);
1065 memcpy(target, data, len);
1067 memset(target, 0, len);
1069 /* Adjust the chunk length field. */
1070 chunk->chunk_hdr->length = htons(chunklen + len);
1071 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1076 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1077 struct sctp_chunk *sctp_make_abort_violation(
1078 const struct sctp_association *asoc,
1079 const struct sctp_chunk *chunk,
1080 const __u8 *payload,
1081 const size_t paylen)
1083 struct sctp_chunk *retval;
1084 struct sctp_paramhdr phdr;
1086 retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) +
1087 paylen + sizeof(phdr));
1091 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen +
1094 phdr.type = htons(chunk->chunk_hdr->type);
1095 phdr.length = chunk->chunk_hdr->length;
1096 sctp_addto_chunk(retval, paylen, payload);
1097 sctp_addto_param(retval, sizeof(phdr), &phdr);
1103 struct sctp_chunk *sctp_make_violation_paramlen(
1104 const struct sctp_association *asoc,
1105 const struct sctp_chunk *chunk,
1106 struct sctp_paramhdr *param)
1108 static const char error[] = "The following parameter had invalid length:";
1109 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) +
1111 struct sctp_chunk *retval;
1113 retval = sctp_make_abort(asoc, chunk, payload_len);
1117 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1118 sizeof(error) + sizeof(*param));
1119 sctp_addto_chunk(retval, sizeof(error), error);
1120 sctp_addto_param(retval, sizeof(*param), param);
1126 struct sctp_chunk *sctp_make_violation_max_retrans(
1127 const struct sctp_association *asoc,
1128 const struct sctp_chunk *chunk)
1130 static const char error[] = "Association exceeded its max_retrans count";
1131 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr);
1132 struct sctp_chunk *retval;
1134 retval = sctp_make_abort(asoc, chunk, payload_len);
1138 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1139 sctp_addto_chunk(retval, sizeof(error), error);
1145 /* Make a HEARTBEAT chunk. */
1146 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1147 const struct sctp_transport *transport)
1149 struct sctp_sender_hb_info hbinfo;
1150 struct sctp_chunk *retval;
1152 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1153 sizeof(hbinfo), GFP_ATOMIC);
1158 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1159 hbinfo.param_hdr.length = htons(sizeof(hbinfo));
1160 hbinfo.daddr = transport->ipaddr;
1161 hbinfo.sent_at = jiffies;
1162 hbinfo.hb_nonce = transport->hb_nonce;
1164 /* Cast away the 'const', as this is just telling the chunk
1165 * what transport it belongs to.
1167 retval->transport = (struct sctp_transport *) transport;
1168 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1175 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1176 const struct sctp_chunk *chunk,
1177 const void *payload,
1178 const size_t paylen)
1180 struct sctp_chunk *retval;
1182 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1187 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1189 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1191 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1192 * HEARTBEAT ACK, * etc.) to the same destination transport
1193 * address from which it * received the DATA or control chunk
1194 * to which it is replying.
1196 * [HBACK back to where the HEARTBEAT came from.]
1199 retval->transport = chunk->transport;
1205 /* Create an Operation Error chunk with the specified space reserved.
1206 * This routine can be used for containing multiple causes in the chunk.
1208 static struct sctp_chunk *sctp_make_op_error_space(
1209 const struct sctp_association *asoc,
1210 const struct sctp_chunk *chunk,
1213 struct sctp_chunk *retval;
1215 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1216 sizeof(struct sctp_errhdr) + size,
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, specifically,
1237 * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads.
1238 * This is a helper function to allocate an error chunk for for those
1239 * invalid parameter codes in which we may not want to report all the
1240 * errors, if the incoming chunk is large. If it can't fit in a single
1241 * packet, we ignore it.
1243 static inline struct sctp_chunk *sctp_make_op_error_limited(
1244 const struct sctp_association *asoc,
1245 const struct sctp_chunk *chunk)
1247 size_t size = SCTP_DEFAULT_MAXSEGMENT;
1248 struct sctp_sock *sp = NULL;
1251 size = min_t(size_t, size, asoc->pathmtu);
1252 sp = sctp_sk(asoc->base.sk);
1255 size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr));
1257 return sctp_make_op_error_space(asoc, chunk, size);
1260 /* Create an Operation Error chunk. */
1261 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1262 const struct sctp_chunk *chunk,
1263 __be16 cause_code, const void *payload,
1264 size_t paylen, size_t reserve_tail)
1266 struct sctp_chunk *retval;
1268 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1272 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1273 sctp_addto_chunk(retval, paylen, payload);
1275 sctp_addto_param(retval, reserve_tail, NULL);
1281 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc,
1284 struct sctp_authhdr auth_hdr;
1285 struct sctp_hmac *hmac_desc;
1286 struct sctp_chunk *retval;
1288 /* Get the first hmac that the peer told us to use */
1289 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1290 if (unlikely(!hmac_desc))
1293 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1294 hmac_desc->hmac_len + sizeof(auth_hdr),
1299 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1300 auth_hdr.shkey_id = htons(key_id);
1302 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr),
1305 skb_put_zero(retval->skb, hmac_desc->hmac_len);
1307 /* Adjust the chunk header to include the empty MAC */
1308 retval->chunk_hdr->length =
1309 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1310 retval->chunk_end = skb_tail_pointer(retval->skb);
1316 /********************************************************************
1317 * 2nd Level Abstractions
1318 ********************************************************************/
1320 /* Turn an skb into a chunk.
1321 * FIXME: Eventually move the structure directly inside the skb->cb[].
1323 * sctpimpguide-05.txt Section 2.8.2
1324 * M1) Each time a new DATA chunk is transmitted
1325 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1326 * 'TSN.Missing.Report' count will be used to determine missing chunks
1327 * and when to fast retransmit.
1330 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1331 const struct sctp_association *asoc,
1332 struct sock *sk, gfp_t gfp)
1334 struct sctp_chunk *retval;
1336 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1341 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1343 INIT_LIST_HEAD(&retval->list);
1345 retval->asoc = (struct sctp_association *)asoc;
1346 retval->singleton = 1;
1348 retval->fast_retransmit = SCTP_CAN_FRTX;
1350 /* Polish the bead hole. */
1351 INIT_LIST_HEAD(&retval->transmitted_list);
1352 INIT_LIST_HEAD(&retval->frag_list);
1353 SCTP_DBG_OBJCNT_INC(chunk);
1354 refcount_set(&retval->refcnt, 1);
1360 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1361 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1362 union sctp_addr *dest)
1364 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1365 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1368 /* Extract the source address from a chunk. */
1369 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1371 /* If we have a known transport, use that. */
1372 if (chunk->transport) {
1373 return &chunk->transport->ipaddr;
1375 /* Otherwise, extract it from the IP header. */
1376 return &chunk->source;
1380 /* Create a new chunk, setting the type and flags headers from the
1381 * arguments, reserving enough space for a 'paylen' byte payload.
1383 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1384 __u8 type, __u8 flags, int paylen,
1387 struct sctp_chunkhdr *chunk_hdr;
1388 struct sctp_chunk *retval;
1389 struct sk_buff *skb;
1393 chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen);
1394 if (chunklen > SCTP_MAX_CHUNK_LEN)
1397 /* No need to allocate LL here, as this is only a chunk. */
1398 skb = alloc_skb(chunklen, gfp);
1402 /* Make room for the chunk header. */
1403 chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr));
1404 chunk_hdr->type = type;
1405 chunk_hdr->flags = flags;
1406 chunk_hdr->length = htons(sizeof(*chunk_hdr));
1408 sk = asoc ? asoc->base.sk : NULL;
1409 retval = sctp_chunkify(skb, asoc, sk, gfp);
1415 retval->chunk_hdr = chunk_hdr;
1416 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr);
1418 /* Determine if the chunk needs to be authenticated */
1419 if (sctp_auth_send_cid(type, asoc))
1427 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1428 __u8 flags, int paylen, gfp_t gfp)
1430 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1433 struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,
1434 __u8 flags, int paylen, gfp_t gfp)
1436 return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp);
1439 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1440 __u8 type, __u8 flags, int paylen,
1443 struct sctp_chunk *chunk;
1445 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1447 sctp_control_set_owner_w(chunk);
1452 /* Release the memory occupied by a chunk. */
1453 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1455 BUG_ON(!list_empty(&chunk->list));
1456 list_del_init(&chunk->transmitted_list);
1458 consume_skb(chunk->skb);
1459 consume_skb(chunk->auth_chunk);
1461 SCTP_DBG_OBJCNT_DEC(chunk);
1462 kmem_cache_free(sctp_chunk_cachep, chunk);
1465 /* Possibly, free the chunk. */
1466 void sctp_chunk_free(struct sctp_chunk *chunk)
1468 /* Release our reference on the message tracker. */
1470 sctp_datamsg_put(chunk->msg);
1472 sctp_chunk_put(chunk);
1475 /* Grab a reference to the chunk. */
1476 void sctp_chunk_hold(struct sctp_chunk *ch)
1478 refcount_inc(&ch->refcnt);
1481 /* Release a reference to the chunk. */
1482 void sctp_chunk_put(struct sctp_chunk *ch)
1484 if (refcount_dec_and_test(&ch->refcnt))
1485 sctp_chunk_destroy(ch);
1488 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1491 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1493 int chunklen = ntohs(chunk->chunk_hdr->length);
1494 int padlen = SCTP_PAD4(chunklen) - chunklen;
1497 skb_put_zero(chunk->skb, padlen);
1498 target = skb_put_data(chunk->skb, data, len);
1500 /* Adjust the chunk length field. */
1501 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1502 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1507 /* Append bytes from user space to the end of a chunk. Will panic if
1508 * chunk is not big enough.
1509 * Returns a kernel err value.
1511 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1512 struct iov_iter *from)
1516 /* Make room in chunk for data. */
1517 target = skb_put(chunk->skb, len);
1519 /* Copy data (whole iovec) into chunk */
1520 if (!copy_from_iter_full(target, len, from))
1523 /* Adjust the chunk length field. */
1524 chunk->chunk_hdr->length =
1525 htons(ntohs(chunk->chunk_hdr->length) + len);
1526 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1531 /* Helper function to assign a TSN if needed. This assumes that both
1532 * the data_hdr and association have already been assigned.
1534 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1536 struct sctp_stream *stream;
1537 struct sctp_chunk *lchunk;
1538 struct sctp_datamsg *msg;
1544 /* All fragments will be on the same stream */
1545 sid = ntohs(chunk->subh.data_hdr->stream);
1546 stream = &chunk->asoc->stream;
1548 /* Now assign the sequence number to the entire message.
1549 * All fragments must have the same stream sequence number.
1552 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1553 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1556 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1557 ssn = sctp_ssn_next(stream, out, sid);
1559 ssn = sctp_ssn_peek(stream, out, sid);
1562 lchunk->subh.data_hdr->ssn = htons(ssn);
1563 lchunk->has_ssn = 1;
1567 /* Helper function to assign a TSN if needed. This assumes that both
1568 * the data_hdr and association have already been assigned.
1570 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1572 if (!chunk->has_tsn) {
1573 /* This is the last possible instant to
1576 chunk->subh.data_hdr->tsn =
1577 htonl(sctp_association_get_next_tsn(chunk->asoc));
1582 /* Create a CLOSED association to use with an incoming packet. */
1583 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1584 struct sctp_chunk *chunk,
1587 struct sctp_association *asoc;
1588 enum sctp_scope scope;
1589 struct sk_buff *skb;
1591 /* Create the bare association. */
1592 scope = sctp_scope(sctp_source(chunk));
1593 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1598 /* Create an entry for the source address of the packet. */
1599 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1605 /* Build a cookie representing asoc.
1606 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1608 static struct sctp_cookie_param *sctp_pack_cookie(
1609 const struct sctp_endpoint *ep,
1610 const struct sctp_association *asoc,
1611 const struct sctp_chunk *init_chunk,
1612 int *cookie_len, const __u8 *raw_addrs,
1615 struct sctp_signed_cookie *cookie;
1616 struct sctp_cookie_param *retval;
1617 int headersize, bodysize;
1619 /* Header size is static data prior to the actual cookie, including
1622 headersize = sizeof(struct sctp_paramhdr) +
1623 (sizeof(struct sctp_signed_cookie) -
1624 sizeof(struct sctp_cookie));
1625 bodysize = sizeof(struct sctp_cookie)
1626 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1628 /* Pad out the cookie to a multiple to make the signature
1629 * functions simpler to write.
1631 if (bodysize % SCTP_COOKIE_MULTIPLE)
1632 bodysize += SCTP_COOKIE_MULTIPLE
1633 - (bodysize % SCTP_COOKIE_MULTIPLE);
1634 *cookie_len = headersize + bodysize;
1636 /* Clear this memory since we are sending this data structure
1637 * out on the network.
1639 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1643 cookie = (struct sctp_signed_cookie *) retval->body;
1645 /* Set up the parameter header. */
1646 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1647 retval->p.length = htons(*cookie_len);
1649 /* Copy the cookie part of the association itself. */
1650 cookie->c = asoc->c;
1651 /* Save the raw address list length in the cookie. */
1652 cookie->c.raw_addr_list_len = addrs_len;
1654 /* Remember PR-SCTP capability. */
1655 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1657 /* Save adaptation indication in the cookie. */
1658 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1660 /* Set an expiration time for the cookie. */
1661 cookie->c.expiration = ktime_add(asoc->cookie_life,
1664 /* Copy the peer's init packet. */
1665 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1666 ntohs(init_chunk->chunk_hdr->length));
1668 /* Copy the raw local address list of the association. */
1669 memcpy((__u8 *)&cookie->c.peer_init[0] +
1670 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1672 if (sctp_sk(ep->base.sk)->hmac) {
1673 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1676 /* Sign the message. */
1677 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1679 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1680 sizeof(ep->secret_key)) ?:
1681 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1683 shash_desc_zero(desc);
1697 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1698 struct sctp_association *sctp_unpack_cookie(
1699 const struct sctp_endpoint *ep,
1700 const struct sctp_association *asoc,
1701 struct sctp_chunk *chunk, gfp_t gfp,
1702 int *error, struct sctp_chunk **errp)
1704 struct sctp_association *retval = NULL;
1705 int headersize, bodysize, fixed_size;
1706 struct sctp_signed_cookie *cookie;
1707 struct sk_buff *skb = chunk->skb;
1708 struct sctp_cookie *bear_cookie;
1709 __u8 *digest = ep->digest;
1710 enum sctp_scope scope;
1714 /* Header size is static data prior to the actual cookie, including
1717 headersize = sizeof(struct sctp_chunkhdr) +
1718 (sizeof(struct sctp_signed_cookie) -
1719 sizeof(struct sctp_cookie));
1720 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1721 fixed_size = headersize + sizeof(struct sctp_cookie);
1723 /* Verify that the chunk looks like it even has a cookie.
1724 * There must be enough room for our cookie and our peer's
1727 len = ntohs(chunk->chunk_hdr->length);
1728 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1731 /* Verify that the cookie has been padded out. */
1732 if (bodysize % SCTP_COOKIE_MULTIPLE)
1735 /* Process the cookie. */
1736 cookie = chunk->subh.cookie_hdr;
1737 bear_cookie = &cookie->c;
1739 if (!sctp_sk(ep->base.sk)->hmac)
1742 /* Check the signature. */
1744 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1747 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)) {
1799 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1800 __be32 n = htonl(usecs);
1803 * Section 3.3.10.3 Stale Cookie Error (3)
1807 * Stale Cookie Error: Indicates the receipt of a valid State
1808 * Cookie that has expired.
1810 *errp = sctp_make_op_error(asoc, chunk,
1811 SCTP_ERROR_STALE_COOKIE, &n,
1814 *error = -SCTP_IERROR_STALE_COOKIE;
1816 *error = -SCTP_IERROR_NOMEM;
1821 /* Make a new base association. */
1822 scope = sctp_scope(sctp_source(chunk));
1823 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1825 *error = -SCTP_IERROR_NOMEM;
1829 /* Set up our peer's port number. */
1830 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1832 /* Populate the association from the cookie. */
1833 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1835 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1837 *error = -SCTP_IERROR_NOMEM;
1841 /* Also, add the destination address. */
1842 if (list_empty(&retval->base.bind_addr.address_list)) {
1843 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1844 sizeof(chunk->dest), SCTP_ADDR_SRC,
1848 retval->next_tsn = retval->c.initial_tsn;
1849 retval->ctsn_ack_point = retval->next_tsn - 1;
1850 retval->addip_serial = retval->c.initial_tsn;
1851 retval->strreset_outseq = retval->c.initial_tsn;
1852 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1853 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1854 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1856 /* The INIT stuff will be done by the side effects. */
1861 sctp_association_free(retval);
1866 /* Yikes! The packet is either corrupt or deliberately
1869 *error = -SCTP_IERROR_MALFORMED;
1873 /********************************************************************
1874 * 3rd Level Abstractions
1875 ********************************************************************/
1877 struct __sctp_missing {
1883 * Report a missing mandatory parameter.
1885 static int sctp_process_missing_param(const struct sctp_association *asoc,
1886 enum sctp_param paramtype,
1887 struct sctp_chunk *chunk,
1888 struct sctp_chunk **errp)
1890 struct __sctp_missing report;
1893 len = SCTP_PAD4(sizeof(report));
1895 /* Make an ERROR chunk, preparing enough room for
1896 * returning multiple unknown parameters.
1899 *errp = sctp_make_op_error_space(asoc, chunk, len);
1902 report.num_missing = htonl(1);
1903 report.type = paramtype;
1904 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1906 sctp_addto_chunk(*errp, sizeof(report), &report);
1909 /* Stop processing this chunk. */
1913 /* Report an Invalid Mandatory Parameter. */
1914 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1915 struct sctp_chunk *chunk,
1916 struct sctp_chunk **errp)
1918 /* Invalid Mandatory Parameter Error has no payload. */
1921 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1924 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1926 /* Stop processing this chunk. */
1930 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1931 struct sctp_paramhdr *param,
1932 const struct sctp_chunk *chunk,
1933 struct sctp_chunk **errp)
1935 /* This is a fatal error. Any accumulated non-fatal errors are
1939 sctp_chunk_free(*errp);
1941 /* Create an error chunk and fill it in with our payload. */
1942 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1948 /* Do not attempt to handle the HOST_NAME parm. However, do
1949 * send back an indicator to the peer.
1951 static int sctp_process_hn_param(const struct sctp_association *asoc,
1952 union sctp_params param,
1953 struct sctp_chunk *chunk,
1954 struct sctp_chunk **errp)
1956 __u16 len = ntohs(param.p->length);
1958 /* Processing of the HOST_NAME parameter will generate an
1959 * ABORT. If we've accumulated any non-fatal errors, they
1960 * would be unrecognized parameters and we should not include
1961 * them in the ABORT.
1964 sctp_chunk_free(*errp);
1966 *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED,
1969 /* Stop processing this chunk. */
1973 static int sctp_verify_ext_param(struct net *net,
1974 const struct sctp_endpoint *ep,
1975 union sctp_params param)
1977 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
1978 int have_asconf = 0;
1982 for (i = 0; i < num_ext; i++) {
1983 switch (param.ext->chunks[i]) {
1987 case SCTP_CID_ASCONF:
1988 case SCTP_CID_ASCONF_ACK:
1994 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1995 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1996 * only if ADD-IP is turned on and we are not backward-compatible
1999 if (net->sctp.addip_noauth)
2002 if (ep->asconf_enable && !have_auth && have_asconf)
2008 static void sctp_process_ext_param(struct sctp_association *asoc,
2009 union sctp_params param)
2011 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2014 for (i = 0; i < num_ext; i++) {
2015 switch (param.ext->chunks[i]) {
2016 case SCTP_CID_RECONF:
2017 if (asoc->ep->reconf_enable)
2018 asoc->peer.reconf_capable = 1;
2020 case SCTP_CID_FWD_TSN:
2021 if (asoc->ep->prsctp_enable)
2022 asoc->peer.prsctp_capable = 1;
2025 /* if the peer reports AUTH, assume that he
2028 if (asoc->ep->auth_enable)
2029 asoc->peer.auth_capable = 1;
2031 case SCTP_CID_ASCONF:
2032 case SCTP_CID_ASCONF_ACK:
2033 if (asoc->ep->asconf_enable)
2034 asoc->peer.asconf_capable = 1;
2036 case SCTP_CID_I_DATA:
2037 if (asoc->ep->intl_enable)
2038 asoc->peer.intl_capable = 1;
2046 /* RFC 3.2.1 & the Implementers Guide 2.2.
2048 * The Parameter Types are encoded such that the
2049 * highest-order two bits specify the action that must be
2050 * taken if the processing endpoint does not recognize the
2053 * 00 - Stop processing this parameter; do not process any further
2054 * parameters within this chunk
2056 * 01 - Stop processing this parameter, do not process any further
2057 * parameters within this chunk, and report the unrecognized
2058 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2060 * 10 - Skip this parameter and continue processing.
2062 * 11 - Skip this parameter and continue processing but
2063 * report the unrecognized parameter in an
2064 * 'Unrecognized Parameter' ERROR chunk.
2067 * SCTP_IERROR_NO_ERROR - continue with the chunk
2068 * SCTP_IERROR_ERROR - stop and report an error.
2069 * SCTP_IERROR_NOMEME - out of memory.
2071 static enum sctp_ierror sctp_process_unk_param(
2072 const struct sctp_association *asoc,
2073 union sctp_params param,
2074 struct sctp_chunk *chunk,
2075 struct sctp_chunk **errp)
2077 int retval = SCTP_IERROR_NO_ERROR;
2079 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2080 case SCTP_PARAM_ACTION_DISCARD:
2081 retval = SCTP_IERROR_ERROR;
2083 case SCTP_PARAM_ACTION_SKIP:
2085 case SCTP_PARAM_ACTION_DISCARD_ERR:
2086 retval = SCTP_IERROR_ERROR;
2088 case SCTP_PARAM_ACTION_SKIP_ERR:
2089 /* Make an ERROR chunk, preparing enough room for
2090 * returning multiple unknown parameters.
2093 *errp = sctp_make_op_error_limited(asoc, chunk);
2095 /* If there is no memory for generating the
2096 * ERROR report as specified, an ABORT will be
2097 * triggered to the peer and the association
2098 * won't be established.
2100 retval = SCTP_IERROR_NOMEM;
2105 if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2106 ntohs(param.p->length)))
2107 sctp_addto_chunk(*errp, ntohs(param.p->length),
2117 /* Verify variable length parameters
2119 * SCTP_IERROR_ABORT - trigger an ABORT
2120 * SCTP_IERROR_NOMEM - out of memory (abort)
2121 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2122 * SCTP_IERROR_NO_ERROR - continue with the chunk
2124 static enum sctp_ierror sctp_verify_param(struct net *net,
2125 const struct sctp_endpoint *ep,
2126 const struct sctp_association *asoc,
2127 union sctp_params param,
2129 struct sctp_chunk *chunk,
2130 struct sctp_chunk **err_chunk)
2132 struct sctp_hmac_algo_param *hmacs;
2133 int retval = SCTP_IERROR_NO_ERROR;
2134 __u16 n_elt, id = 0;
2137 /* FIXME - This routine is not looking at each parameter per the
2138 * chunk type, i.e., unrecognized parameters should be further
2139 * identified based on the chunk id.
2142 switch (param.p->type) {
2143 case SCTP_PARAM_IPV4_ADDRESS:
2144 case SCTP_PARAM_IPV6_ADDRESS:
2145 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2146 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2147 case SCTP_PARAM_STATE_COOKIE:
2148 case SCTP_PARAM_HEARTBEAT_INFO:
2149 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2150 case SCTP_PARAM_ECN_CAPABLE:
2151 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2154 case SCTP_PARAM_SUPPORTED_EXT:
2155 if (!sctp_verify_ext_param(net, ep, param))
2156 return SCTP_IERROR_ABORT;
2159 case SCTP_PARAM_SET_PRIMARY:
2160 if (!ep->asconf_enable)
2163 if (ntohs(param.p->length) < sizeof(struct sctp_addip_param) +
2164 sizeof(struct sctp_paramhdr)) {
2165 sctp_process_inv_paramlength(asoc, param.p,
2167 retval = SCTP_IERROR_ABORT;
2171 case SCTP_PARAM_HOST_NAME_ADDRESS:
2172 /* Tell the peer, we won't support this param. */
2173 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2174 retval = SCTP_IERROR_ABORT;
2177 case SCTP_PARAM_FWD_TSN_SUPPORT:
2178 if (ep->prsctp_enable)
2182 case SCTP_PARAM_RANDOM:
2183 if (!ep->auth_enable)
2186 /* SCTP-AUTH: Secion 6.1
2187 * If the random number is not 32 byte long the association
2188 * MUST be aborted. The ABORT chunk SHOULD contain the error
2189 * cause 'Protocol Violation'.
2191 if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) -
2192 sizeof(struct sctp_paramhdr)) {
2193 sctp_process_inv_paramlength(asoc, param.p,
2195 retval = SCTP_IERROR_ABORT;
2199 case SCTP_PARAM_CHUNKS:
2200 if (!ep->auth_enable)
2203 /* SCTP-AUTH: Section 3.2
2204 * The CHUNKS parameter MUST be included once in the INIT or
2205 * INIT-ACK chunk if the sender wants to receive authenticated
2206 * chunks. Its maximum length is 260 bytes.
2208 if (260 < ntohs(param.p->length)) {
2209 sctp_process_inv_paramlength(asoc, param.p,
2211 retval = SCTP_IERROR_ABORT;
2215 case SCTP_PARAM_HMAC_ALGO:
2216 if (!ep->auth_enable)
2219 hmacs = (struct sctp_hmac_algo_param *)param.p;
2220 n_elt = (ntohs(param.p->length) -
2221 sizeof(struct sctp_paramhdr)) >> 1;
2223 /* SCTP-AUTH: Section 6.1
2224 * The HMAC algorithm based on SHA-1 MUST be supported and
2225 * included in the HMAC-ALGO parameter.
2227 for (i = 0; i < n_elt; i++) {
2228 id = ntohs(hmacs->hmac_ids[i]);
2230 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2234 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2235 sctp_process_inv_paramlength(asoc, param.p, chunk,
2237 retval = SCTP_IERROR_ABORT;
2242 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2243 __func__, ntohs(param.p->type), cid);
2245 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2251 /* Verify the INIT packet before we process it. */
2252 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2253 const struct sctp_association *asoc, enum sctp_cid cid,
2254 struct sctp_init_chunk *peer_init,
2255 struct sctp_chunk *chunk, struct sctp_chunk **errp)
2257 union sctp_params param;
2258 bool has_cookie = false;
2261 /* Check for missing mandatory parameters. Note: Initial TSN is
2262 * also mandatory, but is not checked here since the valid range
2263 * is 0..2**32-1. RFC4960, section 3.3.3.
2265 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2266 peer_init->init_hdr.num_inbound_streams == 0 ||
2267 peer_init->init_hdr.init_tag == 0 ||
2268 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2269 return sctp_process_inv_mandatory(asoc, chunk, errp);
2271 sctp_walk_params(param, peer_init, init_hdr.params) {
2272 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2276 /* There is a possibility that a parameter length was bad and
2277 * in that case we would have stoped walking the parameters.
2278 * The current param.p would point at the bad one.
2279 * Current consensus on the mailing list is to generate a PROTOCOL
2280 * VIOLATION error. We build the ERROR chunk here and let the normal
2281 * error handling code build and send the packet.
2283 if (param.v != (void *)chunk->chunk_end)
2284 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2286 /* The only missing mandatory param possible today is
2287 * the state cookie for an INIT-ACK chunk.
2289 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2290 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2293 /* Verify all the variable length parameters */
2294 sctp_walk_params(param, peer_init, init_hdr.params) {
2295 result = sctp_verify_param(net, ep, asoc, param, cid,
2298 case SCTP_IERROR_ABORT:
2299 case SCTP_IERROR_NOMEM:
2301 case SCTP_IERROR_ERROR:
2303 case SCTP_IERROR_NO_ERROR:
2308 } /* for (loop through all parameters) */
2313 /* Unpack the parameters in an INIT packet into an association.
2314 * Returns 0 on failure, else success.
2315 * FIXME: This is an association method.
2317 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2318 const union sctp_addr *peer_addr,
2319 struct sctp_init_chunk *peer_init, gfp_t gfp)
2321 struct net *net = sock_net(asoc->base.sk);
2322 struct sctp_transport *transport;
2323 struct list_head *pos, *temp;
2324 union sctp_params param;
2325 union sctp_addr addr;
2329 /* We must include the address that the INIT packet came from.
2330 * This is the only address that matters for an INIT packet.
2331 * When processing a COOKIE ECHO, we retrieve the from address
2332 * of the INIT from the cookie.
2335 /* This implementation defaults to making the first transport
2336 * added as the primary transport. The source address seems to
2337 * be a a better choice than any of the embedded addresses.
2339 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2342 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2345 /* Process the initialization parameters. */
2346 sctp_walk_params(param, peer_init, init_hdr.params) {
2348 (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2349 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2350 af = sctp_get_af_specific(param_type2af(param.p->type));
2351 if (!af->from_addr_param(&addr, param.addr,
2352 chunk->sctp_hdr->source, 0))
2354 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2358 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2362 /* source address of chunk may not match any valid address */
2366 /* AUTH: After processing the parameters, make sure that we
2367 * have all the required info to potentially do authentications.
2369 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2370 !asoc->peer.peer_hmacs))
2371 asoc->peer.auth_capable = 0;
2373 /* In a non-backward compatible mode, if the peer claims
2374 * support for ADD-IP but not AUTH, the ADD-IP spec states
2375 * that we MUST ABORT the association. Section 6. The section
2376 * also give us an option to silently ignore the packet, which
2377 * is what we'll do here.
2379 if (!net->sctp.addip_noauth &&
2380 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2381 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2383 SCTP_PARAM_SET_PRIMARY);
2384 asoc->peer.asconf_capable = 0;
2388 /* Walk list of transports, removing transports in the UNKNOWN state. */
2389 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2390 transport = list_entry(pos, struct sctp_transport, transports);
2391 if (transport->state == SCTP_UNKNOWN) {
2392 sctp_assoc_rm_peer(asoc, transport);
2396 /* The fixed INIT headers are always in network byte
2399 asoc->peer.i.init_tag =
2400 ntohl(peer_init->init_hdr.init_tag);
2401 asoc->peer.i.a_rwnd =
2402 ntohl(peer_init->init_hdr.a_rwnd);
2403 asoc->peer.i.num_outbound_streams =
2404 ntohs(peer_init->init_hdr.num_outbound_streams);
2405 asoc->peer.i.num_inbound_streams =
2406 ntohs(peer_init->init_hdr.num_inbound_streams);
2407 asoc->peer.i.initial_tsn =
2408 ntohl(peer_init->init_hdr.initial_tsn);
2410 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2412 /* Apply the upper bounds for output streams based on peer's
2413 * number of inbound streams.
2415 if (asoc->c.sinit_num_ostreams >
2416 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2417 asoc->c.sinit_num_ostreams =
2418 ntohs(peer_init->init_hdr.num_inbound_streams);
2421 if (asoc->c.sinit_max_instreams >
2422 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2423 asoc->c.sinit_max_instreams =
2424 ntohs(peer_init->init_hdr.num_outbound_streams);
2427 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2428 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2430 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2431 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
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 /* Update frag_point when stream_interleave may get changed. */
2460 sctp_assoc_update_frag_point(asoc);
2462 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2465 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2467 * When an endpoint has an ASCONF signaled change to be sent to the
2468 * remote endpoint it should do the following:
2470 * A2) A serial number should be assigned to the Chunk. The serial
2471 * number should be a monotonically increasing number. All serial
2472 * numbers are defined to be initialized at the start of the
2473 * association to the same value as the Initial TSN.
2475 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2479 /* Release the transport structures. */
2480 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2481 transport = list_entry(pos, struct sctp_transport, transports);
2482 if (transport->state != SCTP_ACTIVE)
2483 sctp_assoc_rm_peer(asoc, transport);
2491 /* Update asoc with the option described in param.
2493 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2495 * asoc is the association to update.
2496 * param is the variable length parameter to use for update.
2497 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2498 * If the current packet is an INIT we want to minimize the amount of
2499 * work we do. In particular, we should not build transport
2500 * structures for the addresses.
2502 static int sctp_process_param(struct sctp_association *asoc,
2503 union sctp_params param,
2504 const union sctp_addr *peer_addr,
2507 struct net *net = sock_net(asoc->base.sk);
2508 struct sctp_endpoint *ep = asoc->ep;
2509 union sctp_addr_param *addr_param;
2510 struct sctp_transport *t;
2511 enum sctp_scope scope;
2512 union sctp_addr addr;
2518 /* We maintain all INIT parameters in network byte order all the
2519 * time. This allows us to not worry about whether the parameters
2520 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2522 switch (param.p->type) {
2523 case SCTP_PARAM_IPV6_ADDRESS:
2524 if (PF_INET6 != asoc->base.sk->sk_family)
2528 case SCTP_PARAM_IPV4_ADDRESS:
2529 /* v4 addresses are not allowed on v6-only socket */
2530 if (ipv6_only_sock(asoc->base.sk))
2533 af = sctp_get_af_specific(param_type2af(param.p->type));
2534 if (!af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0))
2536 scope = sctp_scope(peer_addr);
2537 if (sctp_in_scope(net, &addr, scope))
2538 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2542 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2543 if (!net->sctp.cookie_preserve_enable)
2546 stale = ntohl(param.life->lifespan_increment);
2548 /* Suggested Cookie Life span increment's unit is msec,
2551 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2554 case SCTP_PARAM_HOST_NAME_ADDRESS:
2555 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2558 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2559 /* Turn off the default values first so we'll know which
2560 * ones are really set by the peer.
2562 asoc->peer.ipv4_address = 0;
2563 asoc->peer.ipv6_address = 0;
2565 /* Assume that peer supports the address family
2566 * by which it sends a packet.
2568 if (peer_addr->sa.sa_family == AF_INET6)
2569 asoc->peer.ipv6_address = 1;
2570 else if (peer_addr->sa.sa_family == AF_INET)
2571 asoc->peer.ipv4_address = 1;
2573 /* Cycle through address types; avoid divide by 0. */
2574 sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2576 sat /= sizeof(__u16);
2578 for (i = 0; i < sat; ++i) {
2579 switch (param.sat->types[i]) {
2580 case SCTP_PARAM_IPV4_ADDRESS:
2581 asoc->peer.ipv4_address = 1;
2584 case SCTP_PARAM_IPV6_ADDRESS:
2585 if (PF_INET6 == asoc->base.sk->sk_family)
2586 asoc->peer.ipv6_address = 1;
2589 case SCTP_PARAM_HOST_NAME_ADDRESS:
2590 asoc->peer.hostname_address = 1;
2593 default: /* Just ignore anything else. */
2599 case SCTP_PARAM_STATE_COOKIE:
2600 asoc->peer.cookie_len =
2601 ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2602 kfree(asoc->peer.cookie);
2603 asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp);
2604 if (!asoc->peer.cookie)
2608 case SCTP_PARAM_HEARTBEAT_INFO:
2609 /* Would be odd to receive, but it causes no problems. */
2612 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2613 /* Rejected during verify stage. */
2616 case SCTP_PARAM_ECN_CAPABLE:
2617 if (asoc->ep->ecn_enable) {
2618 asoc->peer.ecn_capable = 1;
2625 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2626 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2629 case SCTP_PARAM_SET_PRIMARY:
2630 if (!ep->asconf_enable)
2633 addr_param = param.v + sizeof(struct sctp_addip_param);
2635 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2639 if (!af->from_addr_param(&addr, addr_param,
2640 htons(asoc->peer.port), 0))
2643 if (!af->addr_valid(&addr, NULL, NULL))
2646 t = sctp_assoc_lookup_paddr(asoc, &addr);
2650 sctp_assoc_set_primary(asoc, t);
2653 case SCTP_PARAM_SUPPORTED_EXT:
2654 sctp_process_ext_param(asoc, param);
2657 case SCTP_PARAM_FWD_TSN_SUPPORT:
2658 if (asoc->ep->prsctp_enable) {
2659 asoc->peer.prsctp_capable = 1;
2665 case SCTP_PARAM_RANDOM:
2666 if (!ep->auth_enable)
2669 /* Save peer's random parameter */
2670 kfree(asoc->peer.peer_random);
2671 asoc->peer.peer_random = kmemdup(param.p,
2672 ntohs(param.p->length), gfp);
2673 if (!asoc->peer.peer_random) {
2679 case SCTP_PARAM_HMAC_ALGO:
2680 if (!ep->auth_enable)
2683 /* Save peer's HMAC list */
2684 kfree(asoc->peer.peer_hmacs);
2685 asoc->peer.peer_hmacs = kmemdup(param.p,
2686 ntohs(param.p->length), gfp);
2687 if (!asoc->peer.peer_hmacs) {
2692 /* Set the default HMAC the peer requested*/
2693 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2696 case SCTP_PARAM_CHUNKS:
2697 if (!ep->auth_enable)
2700 kfree(asoc->peer.peer_chunks);
2701 asoc->peer.peer_chunks = kmemdup(param.p,
2702 ntohs(param.p->length), gfp);
2703 if (!asoc->peer.peer_chunks)
2708 /* Any unrecognized parameters should have been caught
2709 * and handled by sctp_verify_param() which should be
2710 * called prior to this routine. Simply log the error
2713 pr_debug("%s: ignoring param:%d for association:%p.\n",
2714 __func__, ntohs(param.p->type), asoc);
2721 /* Select a new verification tag. */
2722 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2724 /* I believe that this random number generator complies with RFC1750.
2725 * A tag of 0 is reserved for special cases (e.g. INIT).
2730 get_random_bytes(&x, sizeof(__u32));
2736 /* Select an initial TSN to send during startup. */
2737 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2741 get_random_bytes(&retval, sizeof(__u32));
2746 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2748 * 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
2749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2750 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2754 * | Address Parameter |
2755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2756 * | ASCONF Parameter #1 |
2757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2761 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2762 * | ASCONF Parameter #N |
2763 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2765 * Address Parameter and other parameter will not be wrapped in this function
2767 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2768 union sctp_addr *addr,
2771 struct sctp_addiphdr asconf;
2772 struct sctp_chunk *retval;
2773 int length = sizeof(asconf) + vparam_len;
2774 union sctp_addr_param addrparam;
2776 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2778 addrlen = af->to_addr_param(addr, &addrparam);
2783 /* Create the chunk. */
2784 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2789 asconf.serial = htonl(asoc->addip_serial++);
2791 retval->subh.addip_hdr =
2792 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2793 retval->param_hdr.v =
2794 sctp_addto_chunk(retval, addrlen, &addrparam);
2800 * 3.2.1 Add IP Address
2802 * 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
2803 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2804 * | Type = 0xC001 | Length = Variable |
2805 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2806 * | ASCONF-Request Correlation ID |
2807 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2808 * | Address Parameter |
2809 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2811 * 3.2.2 Delete IP Address
2813 * 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
2814 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2815 * | Type = 0xC002 | Length = Variable |
2816 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2817 * | ASCONF-Request Correlation ID |
2818 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2819 * | Address Parameter |
2820 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2823 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2824 union sctp_addr *laddr,
2825 struct sockaddr *addrs,
2826 int addrcnt, __be16 flags)
2828 union sctp_addr_param addr_param;
2829 struct sctp_addip_param param;
2830 int paramlen = sizeof(param);
2831 struct sctp_chunk *retval;
2832 int addr_param_len = 0;
2833 union sctp_addr *addr;
2834 int totallen = 0, i;
2839 /* Get total length of all the address parameters. */
2841 for (i = 0; i < addrcnt; i++) {
2843 af = sctp_get_af_specific(addr->v4.sin_family);
2844 addr_param_len = af->to_addr_param(addr, &addr_param);
2846 totallen += paramlen;
2847 totallen += addr_param_len;
2849 addr_buf += af->sockaddr_len;
2850 if (asoc->asconf_addr_del_pending && !del_pickup) {
2851 /* reuse the parameter length from the same scope one */
2852 totallen += paramlen;
2853 totallen += addr_param_len;
2856 pr_debug("%s: picked same-scope del_pending addr, "
2857 "totallen for all addresses is %d\n",
2858 __func__, totallen);
2862 /* Create an asconf chunk with the required length. */
2863 retval = sctp_make_asconf(asoc, laddr, totallen);
2867 /* Add the address parameters to the asconf chunk. */
2869 for (i = 0; i < addrcnt; i++) {
2871 af = sctp_get_af_specific(addr->v4.sin_family);
2872 addr_param_len = af->to_addr_param(addr, &addr_param);
2873 param.param_hdr.type = flags;
2874 param.param_hdr.length = htons(paramlen + addr_param_len);
2875 param.crr_id = htonl(i);
2877 sctp_addto_chunk(retval, paramlen, ¶m);
2878 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2880 addr_buf += af->sockaddr_len;
2882 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2883 addr = asoc->asconf_addr_del_pending;
2884 af = sctp_get_af_specific(addr->v4.sin_family);
2885 addr_param_len = af->to_addr_param(addr, &addr_param);
2886 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2887 param.param_hdr.length = htons(paramlen + addr_param_len);
2888 param.crr_id = htonl(i);
2890 sctp_addto_chunk(retval, paramlen, ¶m);
2891 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2897 * 3.2.4 Set Primary IP Address
2899 * 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
2900 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2901 * | Type =0xC004 | Length = Variable |
2902 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2903 * | ASCONF-Request Correlation ID |
2904 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2905 * | Address Parameter |
2906 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2908 * Create an ASCONF chunk with Set Primary IP address parameter.
2910 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2911 union sctp_addr *addr)
2913 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2914 union sctp_addr_param addrparam;
2915 struct sctp_addip_param param;
2916 struct sctp_chunk *retval;
2917 int len = sizeof(param);
2920 addrlen = af->to_addr_param(addr, &addrparam);
2925 /* Create the chunk and make asconf header. */
2926 retval = sctp_make_asconf(asoc, addr, len);
2930 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2931 param.param_hdr.length = htons(len);
2934 sctp_addto_chunk(retval, sizeof(param), ¶m);
2935 sctp_addto_chunk(retval, addrlen, &addrparam);
2940 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2942 * 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
2943 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2944 * | Type = 0x80 | Chunk Flags | Chunk Length |
2945 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2947 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2948 * | ASCONF Parameter Response#1 |
2949 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2954 * | ASCONF Parameter Response#N |
2955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2957 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2959 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2960 __u32 serial, int vparam_len)
2962 struct sctp_addiphdr asconf;
2963 struct sctp_chunk *retval;
2964 int length = sizeof(asconf) + vparam_len;
2966 /* Create the chunk. */
2967 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2972 asconf.serial = htonl(serial);
2974 retval->subh.addip_hdr =
2975 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2980 /* Add response parameters to an ASCONF_ACK chunk. */
2981 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2983 struct sctp_addip_param *asconf_param)
2985 struct sctp_addip_param ack_param;
2986 struct sctp_errhdr err_param;
2987 int asconf_param_len = 0;
2988 int err_param_len = 0;
2989 __be16 response_type;
2991 if (SCTP_ERROR_NO_ERROR == err_code) {
2992 response_type = SCTP_PARAM_SUCCESS_REPORT;
2994 response_type = SCTP_PARAM_ERR_CAUSE;
2995 err_param_len = sizeof(err_param);
2998 ntohs(asconf_param->param_hdr.length);
3001 /* Add Success Indication or Error Cause Indication parameter. */
3002 ack_param.param_hdr.type = response_type;
3003 ack_param.param_hdr.length = htons(sizeof(ack_param) +
3006 ack_param.crr_id = crr_id;
3007 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
3009 if (SCTP_ERROR_NO_ERROR == err_code)
3012 /* Add Error Cause parameter. */
3013 err_param.cause = err_code;
3014 err_param.length = htons(err_param_len + asconf_param_len);
3015 sctp_addto_chunk(chunk, err_param_len, &err_param);
3017 /* Add the failed TLV copied from ASCONF chunk. */
3019 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3022 /* Process a asconf parameter. */
3023 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3024 struct sctp_chunk *asconf,
3025 struct sctp_addip_param *asconf_param)
3027 union sctp_addr_param *addr_param;
3028 struct sctp_transport *peer;
3029 union sctp_addr addr;
3032 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3034 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3035 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3036 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3037 return SCTP_ERROR_UNKNOWN_PARAM;
3039 switch (addr_param->p.type) {
3040 case SCTP_PARAM_IPV6_ADDRESS:
3041 if (!asoc->peer.ipv6_address)
3042 return SCTP_ERROR_DNS_FAILED;
3044 case SCTP_PARAM_IPV4_ADDRESS:
3045 if (!asoc->peer.ipv4_address)
3046 return SCTP_ERROR_DNS_FAILED;
3049 return SCTP_ERROR_DNS_FAILED;
3052 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3054 return SCTP_ERROR_DNS_FAILED;
3056 if (!af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0))
3057 return SCTP_ERROR_DNS_FAILED;
3059 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3060 * or multicast address.
3061 * (note: wildcard is permitted and requires special handling so
3062 * make sure we check for that)
3064 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3065 return SCTP_ERROR_DNS_FAILED;
3067 switch (asconf_param->param_hdr.type) {
3068 case SCTP_PARAM_ADD_IP:
3070 * If the address 0.0.0.0 or ::0 is provided, the source
3071 * address of the packet MUST be added.
3073 if (af->is_any(&addr))
3074 memcpy(&addr, &asconf->source, sizeof(addr));
3076 if (security_sctp_bind_connect(asoc->ep->base.sk,
3078 (struct sockaddr *)&addr,
3080 return SCTP_ERROR_REQ_REFUSED;
3082 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3083 * request and does not have the local resources to add this
3084 * new address to the association, it MUST return an Error
3085 * Cause TLV set to the new error code 'Operation Refused
3086 * Due to Resource Shortage'.
3089 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3091 return SCTP_ERROR_RSRC_LOW;
3093 /* Start the heartbeat timer. */
3094 sctp_transport_reset_hb_timer(peer);
3095 asoc->new_transport = peer;
3097 case SCTP_PARAM_DEL_IP:
3098 /* ADDIP 4.3 D7) If a request is received to delete the
3099 * last remaining IP address of a peer endpoint, the receiver
3100 * MUST send an Error Cause TLV with the error cause set to the
3101 * new error code 'Request to Delete Last Remaining IP Address'.
3103 if (asoc->peer.transport_count == 1)
3104 return SCTP_ERROR_DEL_LAST_IP;
3106 /* ADDIP 4.3 D8) If a request is received to delete an IP
3107 * address which is also the source address of the IP packet
3108 * which contained the ASCONF chunk, the receiver MUST reject
3109 * this request. To reject the request the receiver MUST send
3110 * an Error Cause TLV set to the new error code 'Request to
3111 * Delete Source IP Address'
3113 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3114 return SCTP_ERROR_DEL_SRC_IP;
3117 * If the address 0.0.0.0 or ::0 is provided, all
3118 * addresses of the peer except the source address of the
3119 * packet MUST be deleted.
3121 if (af->is_any(&addr)) {
3122 sctp_assoc_set_primary(asoc, asconf->transport);
3123 sctp_assoc_del_nonprimary_peers(asoc,
3125 return SCTP_ERROR_NO_ERROR;
3128 /* If the address is not part of the association, the
3129 * ASCONF-ACK with Error Cause Indication Parameter
3130 * which including cause of Unresolvable Address should
3133 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3135 return SCTP_ERROR_DNS_FAILED;
3137 sctp_assoc_rm_peer(asoc, peer);
3139 case SCTP_PARAM_SET_PRIMARY:
3140 /* ADDIP Section 4.2.4
3141 * If the address 0.0.0.0 or ::0 is provided, the receiver
3142 * MAY mark the source address of the packet as its
3145 if (af->is_any(&addr))
3146 memcpy(&addr, sctp_source(asconf), sizeof(addr));
3148 if (security_sctp_bind_connect(asoc->ep->base.sk,
3149 SCTP_PARAM_SET_PRIMARY,
3150 (struct sockaddr *)&addr,
3152 return SCTP_ERROR_REQ_REFUSED;
3154 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3156 return SCTP_ERROR_DNS_FAILED;
3158 sctp_assoc_set_primary(asoc, peer);
3162 return SCTP_ERROR_NO_ERROR;
3165 /* Verify the ASCONF packet before we process it. */
3166 bool sctp_verify_asconf(const struct sctp_association *asoc,
3167 struct sctp_chunk *chunk, bool addr_param_needed,
3168 struct sctp_paramhdr **errp)
3170 struct sctp_addip_chunk *addip;
3171 bool addr_param_seen = false;
3172 union sctp_params param;
3174 addip = (struct sctp_addip_chunk *)chunk->chunk_hdr;
3175 sctp_walk_params(param, addip, addip_hdr.params) {
3176 size_t length = ntohs(param.p->length);
3179 switch (param.p->type) {
3180 case SCTP_PARAM_ERR_CAUSE:
3182 case SCTP_PARAM_IPV4_ADDRESS:
3183 if (length != sizeof(struct sctp_ipv4addr_param))
3185 /* ensure there is only one addr param and it's in the
3186 * beginning of addip_hdr params, or we reject it.
3188 if (param.v != addip->addip_hdr.params)
3190 addr_param_seen = true;
3192 case SCTP_PARAM_IPV6_ADDRESS:
3193 if (length != sizeof(struct sctp_ipv6addr_param))
3195 if (param.v != addip->addip_hdr.params)
3197 addr_param_seen = true;
3199 case SCTP_PARAM_ADD_IP:
3200 case SCTP_PARAM_DEL_IP:
3201 case SCTP_PARAM_SET_PRIMARY:
3202 /* In ASCONF chunks, these need to be first. */
3203 if (addr_param_needed && !addr_param_seen)
3205 length = ntohs(param.addip->param_hdr.length);
3206 if (length < sizeof(struct sctp_addip_param) +
3210 case SCTP_PARAM_SUCCESS_REPORT:
3211 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3212 if (length != sizeof(struct sctp_addip_param))
3216 /* This is unkown to us, reject! */
3221 /* Remaining sanity checks. */
3222 if (addr_param_needed && !addr_param_seen)
3224 if (!addr_param_needed && addr_param_seen)
3226 if (param.v != chunk->chunk_end)
3232 /* Process an incoming ASCONF chunk with the next expected serial no. and
3233 * return an ASCONF_ACK chunk to be sent in response.
3235 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3236 struct sctp_chunk *asconf)
3238 union sctp_addr_param *addr_param;
3239 struct sctp_addip_chunk *addip;
3240 struct sctp_chunk *asconf_ack;
3241 bool all_param_pass = true;
3242 struct sctp_addiphdr *hdr;
3243 int length = 0, chunk_len;
3244 union sctp_params param;
3248 addip = (struct sctp_addip_chunk *)asconf->chunk_hdr;
3249 chunk_len = ntohs(asconf->chunk_hdr->length) -
3250 sizeof(struct sctp_chunkhdr);
3251 hdr = (struct sctp_addiphdr *)asconf->skb->data;
3252 serial = ntohl(hdr->serial);
3254 /* Skip the addiphdr and store a pointer to address parameter. */
3255 length = sizeof(*hdr);
3256 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3257 chunk_len -= length;
3259 /* Skip the address parameter and store a pointer to the first
3262 length = ntohs(addr_param->p.length);
3263 chunk_len -= length;
3265 /* create an ASCONF_ACK chunk.
3266 * Based on the definitions of parameters, we know that the size of
3267 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3270 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3274 /* Process the TLVs contained within the ASCONF chunk. */
3275 sctp_walk_params(param, addip, addip_hdr.params) {
3276 /* Skip preceeding address parameters. */
3277 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3278 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3281 err_code = sctp_process_asconf_param(asoc, asconf,
3284 * If an error response is received for a TLV parameter,
3285 * all TLVs with no response before the failed TLV are
3286 * considered successful if not reported. All TLVs after
3287 * the failed response are considered unsuccessful unless
3288 * a specific success indication is present for the parameter.
3290 if (err_code != SCTP_ERROR_NO_ERROR)
3291 all_param_pass = false;
3292 if (!all_param_pass)
3293 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3294 err_code, param.addip);
3296 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3297 * an IP address sends an 'Out of Resource' in its response, it
3298 * MUST also fail any subsequent add or delete requests bundled
3301 if (err_code == SCTP_ERROR_RSRC_LOW)
3305 asoc->peer.addip_serial++;
3307 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3308 * after freeing the reference to old asconf ack if any.
3311 sctp_chunk_hold(asconf_ack);
3312 list_add_tail(&asconf_ack->transmitted_list,
3313 &asoc->asconf_ack_list);
3319 /* Process a asconf parameter that is successfully acked. */
3320 static void sctp_asconf_param_success(struct sctp_association *asoc,
3321 struct sctp_addip_param *asconf_param)
3323 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3324 union sctp_addr_param *addr_param;
3325 struct sctp_sockaddr_entry *saddr;
3326 struct sctp_transport *transport;
3327 union sctp_addr addr;
3330 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3332 /* We have checked the packet before, so we do not check again. */
3333 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3334 if (!af->from_addr_param(&addr, addr_param, htons(bp->port), 0))
3337 switch (asconf_param->param_hdr.type) {
3338 case SCTP_PARAM_ADD_IP:
3339 /* This is always done in BH context with a socket lock
3340 * held, so the list can not change.
3343 list_for_each_entry(saddr, &bp->address_list, list) {
3344 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3345 saddr->state = SCTP_ADDR_SRC;
3348 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3350 sctp_transport_dst_release(transport);
3353 case SCTP_PARAM_DEL_IP:
3355 sctp_del_bind_addr(bp, &addr);
3356 if (asoc->asconf_addr_del_pending != NULL &&
3357 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3358 kfree(asoc->asconf_addr_del_pending);
3359 asoc->asconf_addr_del_pending = NULL;
3362 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3364 sctp_transport_dst_release(transport);
3372 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3373 * for the given asconf parameter. If there is no response for this parameter,
3374 * return the error code based on the third argument 'no_err'.
3376 * A7) If an error response is received for a TLV parameter, all TLVs with no
3377 * response before the failed TLV are considered successful if not reported.
3378 * All TLVs after the failed response are considered unsuccessful unless a
3379 * specific success indication is present for the parameter.
3381 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3382 struct sctp_addip_param *asconf_param,
3385 struct sctp_addip_param *asconf_ack_param;
3386 struct sctp_errhdr *err_param;
3392 err_code = SCTP_ERROR_NO_ERROR;
3394 err_code = SCTP_ERROR_REQ_REFUSED;
3396 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3397 sizeof(struct sctp_chunkhdr);
3399 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3400 * the first asconf_ack parameter.
3402 length = sizeof(struct sctp_addiphdr);
3403 asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data +
3405 asconf_ack_len -= length;
3407 while (asconf_ack_len > 0) {
3408 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3409 switch (asconf_ack_param->param_hdr.type) {
3410 case SCTP_PARAM_SUCCESS_REPORT:
3411 return SCTP_ERROR_NO_ERROR;
3412 case SCTP_PARAM_ERR_CAUSE:
3413 length = sizeof(*asconf_ack_param);
3414 err_param = (void *)asconf_ack_param + length;
3415 asconf_ack_len -= length;
3416 if (asconf_ack_len > 0)
3417 return err_param->cause;
3419 return SCTP_ERROR_INV_PARAM;
3422 return SCTP_ERROR_INV_PARAM;
3426 length = ntohs(asconf_ack_param->param_hdr.length);
3427 asconf_ack_param = (void *)asconf_ack_param + length;
3428 asconf_ack_len -= length;
3434 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3435 int sctp_process_asconf_ack(struct sctp_association *asoc,
3436 struct sctp_chunk *asconf_ack)
3438 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3439 struct sctp_addip_param *asconf_param;
3440 __be16 err_code = SCTP_ERROR_NO_ERROR;
3441 union sctp_addr_param *addr_param;
3442 int asconf_len = asconf->skb->len;
3443 int all_param_pass = 0;
3448 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3449 * a pointer to address parameter.
3451 length = sizeof(struct sctp_addip_chunk);
3452 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3453 asconf_len -= length;
3455 /* Skip the address parameter in the last asconf sent and store a
3456 * pointer to the first asconf parameter.
3458 length = ntohs(addr_param->p.length);
3459 asconf_param = (void *)addr_param + length;
3460 asconf_len -= length;
3463 * A8) If there is no response(s) to specific TLV parameter(s), and no
3464 * failures are indicated, then all request(s) are considered
3467 if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr))
3470 /* Process the TLVs contained in the last sent ASCONF chunk. */
3471 while (asconf_len > 0) {
3473 err_code = SCTP_ERROR_NO_ERROR;
3475 err_code = sctp_get_asconf_response(asconf_ack,
3478 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3483 case SCTP_ERROR_NO_ERROR:
3484 sctp_asconf_param_success(asoc, asconf_param);
3487 case SCTP_ERROR_RSRC_LOW:
3491 case SCTP_ERROR_UNKNOWN_PARAM:
3492 /* Disable sending this type of asconf parameter in
3495 asoc->peer.addip_disabled_mask |=
3496 asconf_param->param_hdr.type;
3499 case SCTP_ERROR_REQ_REFUSED:
3500 case SCTP_ERROR_DEL_LAST_IP:
3501 case SCTP_ERROR_DEL_SRC_IP:
3506 /* Skip the processed asconf parameter and move to the next
3509 length = ntohs(asconf_param->param_hdr.length);
3510 asconf_param = (void *)asconf_param + length;
3511 asconf_len -= length;
3514 if (no_err && asoc->src_out_of_asoc_ok) {
3515 asoc->src_out_of_asoc_ok = 0;
3516 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3519 /* Free the cached last sent asconf chunk. */
3520 list_del_init(&asconf->transmitted_list);
3521 sctp_chunk_free(asconf);
3522 asoc->addip_last_asconf = NULL;
3527 /* Make a FWD TSN chunk. */
3528 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3529 __u32 new_cum_tsn, size_t nstreams,
3530 struct sctp_fwdtsn_skip *skiplist)
3532 struct sctp_chunk *retval = NULL;
3533 struct sctp_fwdtsn_hdr ftsn_hdr;
3534 struct sctp_fwdtsn_skip skip;
3538 hint = (nstreams + 1) * sizeof(__u32);
3540 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3545 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3546 retval->subh.fwdtsn_hdr =
3547 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3549 for (i = 0; i < nstreams; i++) {
3550 skip.stream = skiplist[i].stream;
3551 skip.ssn = skiplist[i].ssn;
3552 sctp_addto_chunk(retval, sizeof(skip), &skip);
3558 struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
3559 __u32 new_cum_tsn, size_t nstreams,
3560 struct sctp_ifwdtsn_skip *skiplist)
3562 struct sctp_chunk *retval = NULL;
3563 struct sctp_ifwdtsn_hdr ftsn_hdr;
3566 hint = (nstreams + 1) * sizeof(__u32);
3568 retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint,
3573 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3574 retval->subh.ifwdtsn_hdr =
3575 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3577 sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist);
3582 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3584 * 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
3585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3586 * | Type = 130 | Chunk Flags | Chunk Length |
3587 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3589 * / Re-configuration Parameter /
3591 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3593 * / Re-configuration Parameter (optional) /
3595 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3597 static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc,
3600 struct sctp_reconf_chunk *reconf;
3601 struct sctp_chunk *retval;
3603 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3608 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3609 retval->param_hdr.v = reconf->params;
3614 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3616 * 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
3617 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3618 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3619 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3620 * | Re-configuration Request Sequence Number |
3621 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3622 * | Re-configuration Response Sequence Number |
3623 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3624 * | Sender's Last Assigned TSN |
3625 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3626 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3627 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3629 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3630 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3631 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3633 * RE-CONFIG 4.2 (STREAM IN RESET)
3635 * 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
3636 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3637 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3638 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3639 * | Re-configuration Request Sequence Number |
3640 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3641 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3642 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3644 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3645 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3646 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3648 struct sctp_chunk *sctp_make_strreset_req(
3649 const struct sctp_association *asoc,
3650 __u16 stream_num, __be16 *stream_list,
3653 __u16 stream_len = stream_num * sizeof(__u16);
3654 struct sctp_strreset_outreq outreq;
3655 struct sctp_strreset_inreq inreq;
3656 struct sctp_chunk *retval;
3657 __u16 outlen, inlen;
3659 outlen = (sizeof(outreq) + stream_len) * out;
3660 inlen = (sizeof(inreq) + stream_len) * in;
3662 retval = sctp_make_reconf(asoc, SCTP_PAD4(outlen) + SCTP_PAD4(inlen));
3667 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3668 outreq.param_hdr.length = htons(outlen);
3669 outreq.request_seq = htonl(asoc->strreset_outseq);
3670 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3671 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3673 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3676 sctp_addto_chunk(retval, stream_len, stream_list);
3680 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3681 inreq.param_hdr.length = htons(inlen);
3682 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3684 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3687 sctp_addto_chunk(retval, stream_len, stream_list);
3693 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3695 * 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
3696 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3697 * | Parameter Type = 15 | Parameter Length = 8 |
3698 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3699 * | Re-configuration Request Sequence Number |
3700 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3702 struct sctp_chunk *sctp_make_strreset_tsnreq(
3703 const struct sctp_association *asoc)
3705 struct sctp_strreset_tsnreq tsnreq;
3706 __u16 length = sizeof(tsnreq);
3707 struct sctp_chunk *retval;
3709 retval = sctp_make_reconf(asoc, length);
3713 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3714 tsnreq.param_hdr.length = htons(length);
3715 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3717 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3722 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3724 * 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
3725 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3726 * | Parameter Type = 17 | Parameter Length = 12 |
3727 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3728 * | Re-configuration Request Sequence Number |
3729 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3730 * | Number of new streams | Reserved |
3731 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3733 struct sctp_chunk *sctp_make_strreset_addstrm(
3734 const struct sctp_association *asoc,
3735 __u16 out, __u16 in)
3737 struct sctp_strreset_addstrm addstrm;
3738 __u16 size = sizeof(addstrm);
3739 struct sctp_chunk *retval;
3741 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3746 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3747 addstrm.param_hdr.length = htons(size);
3748 addstrm.number_of_streams = htons(out);
3749 addstrm.request_seq = htonl(asoc->strreset_outseq);
3750 addstrm.reserved = 0;
3752 sctp_addto_chunk(retval, size, &addstrm);
3756 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3757 addstrm.param_hdr.length = htons(size);
3758 addstrm.number_of_streams = htons(in);
3759 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3760 addstrm.reserved = 0;
3762 sctp_addto_chunk(retval, size, &addstrm);
3768 /* RE-CONFIG 4.4 (RESP)
3770 * 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
3771 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3772 * | Parameter Type = 16 | Parameter Length |
3773 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3774 * | Re-configuration Response Sequence Number |
3775 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3777 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3779 struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
3780 __u32 result, __u32 sn)
3782 struct sctp_strreset_resp resp;
3783 __u16 length = sizeof(resp);
3784 struct sctp_chunk *retval;
3786 retval = sctp_make_reconf(asoc, length);
3790 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3791 resp.param_hdr.length = htons(length);
3792 resp.response_seq = htonl(sn);
3793 resp.result = htonl(result);
3795 sctp_addto_chunk(retval, sizeof(resp), &resp);
3800 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3802 * 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
3803 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3804 * | Parameter Type = 16 | Parameter Length |
3805 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3806 * | Re-configuration Response Sequence Number |
3807 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3809 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3810 * | Sender's Next TSN (optional) |
3811 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3812 * | Receiver's Next TSN (optional) |
3813 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3815 struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
3816 __u32 result, __u32 sn,
3820 struct sctp_strreset_resptsn tsnresp;
3821 __u16 length = sizeof(tsnresp);
3822 struct sctp_chunk *retval;
3824 retval = sctp_make_reconf(asoc, length);
3828 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3829 tsnresp.param_hdr.length = htons(length);
3831 tsnresp.response_seq = htonl(sn);
3832 tsnresp.result = htonl(result);
3833 tsnresp.senders_next_tsn = htonl(sender_tsn);
3834 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3836 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3841 bool sctp_verify_reconf(const struct sctp_association *asoc,
3842 struct sctp_chunk *chunk,
3843 struct sctp_paramhdr **errp)
3845 struct sctp_reconf_chunk *hdr;
3846 union sctp_params param;
3850 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3851 sctp_walk_params(param, hdr, params) {
3852 __u16 length = ntohs(param.p->length);
3857 switch (param.p->type) {
3858 case SCTP_PARAM_RESET_OUT_REQUEST:
3859 if (length < sizeof(struct sctp_strreset_outreq) ||
3860 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3861 last != SCTP_PARAM_RESET_IN_REQUEST))
3864 case SCTP_PARAM_RESET_IN_REQUEST:
3865 if (length < sizeof(struct sctp_strreset_inreq) ||
3866 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3869 case SCTP_PARAM_RESET_RESPONSE:
3870 if ((length != sizeof(struct sctp_strreset_resp) &&
3871 length != sizeof(struct sctp_strreset_resptsn)) ||
3872 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3873 last != SCTP_PARAM_RESET_OUT_REQUEST))
3876 case SCTP_PARAM_RESET_TSN_REQUEST:
3878 sizeof(struct sctp_strreset_tsnreq) || last)
3881 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3882 if (length != sizeof(struct sctp_strreset_addstrm) ||
3883 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3886 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3887 if (length != sizeof(struct sctp_strreset_addstrm) ||
3888 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3895 last = param.p->type;