1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2002 Intel Corp.
7 * This file is part of the SCTP kernel implementation
9 * These functions work with the state functions in sctp_sm_statefuns.c
10 * to implement the state operations. These functions implement the
11 * steps which require modifying existing data structures.
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
30 * Please send any bug reports or fixes you make to the
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * C. Robin <chris@hundredacre.ac.uk>
41 * Jon Grimm <jgrimm@us.ibm.com>
42 * Xingang Guo <xingang.guo@intel.com>
43 * Dajiang Zhang <dajiang.zhang@nokia.com>
44 * Sridhar Samudrala <sri@us.ibm.com>
45 * Daisy Chang <daisyc@us.ibm.com>
46 * Ardelle Fan <ardelle.fan@intel.com>
47 * Kevin Gao <kevin.gao@intel.com>
49 * Any bugs reported given to us we will try to fix... any fixes shared will
50 * be incorporated into the next SCTP release.
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <linux/types.h>
56 #include <linux/kernel.h>
58 #include <linux/ipv6.h>
59 #include <linux/net.h>
60 #include <linux/inet.h>
61 #include <linux/scatterlist.h>
62 #include <linux/crypto.h>
63 #include <linux/slab.h>
66 #include <linux/skbuff.h>
67 #include <linux/random.h> /* for get_random_bytes */
68 #include <net/sctp/sctp.h>
69 #include <net/sctp/sm.h>
72 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
73 __u8 type
, __u8 flags
, int paylen
);
74 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
75 const struct sctp_association
*asoc
,
76 const struct sctp_chunk
*init_chunk
,
78 const __u8
*raw_addrs
, int addrs_len
);
79 static int sctp_process_param(struct sctp_association
*asoc
,
80 union sctp_params param
,
81 const union sctp_addr
*peer_addr
,
83 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
86 /* What was the inbound interface for this chunk? */
87 int sctp_chunk_iif(const struct sctp_chunk
*chunk
)
92 af
= sctp_get_af_specific(ipver2af(ip_hdr(chunk
->skb
)->version
));
94 iif
= af
->skb_iif(chunk
->skb
);
99 /* RFC 2960 3.3.2 Initiation (INIT) (1)
101 * Note 2: The ECN capable field is reserved for future use of
102 * Explicit Congestion Notification.
104 static const struct sctp_paramhdr ecap_param
= {
105 SCTP_PARAM_ECN_CAPABLE
,
106 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
108 static const struct sctp_paramhdr prsctp_param
= {
109 SCTP_PARAM_FWD_TSN_SUPPORT
,
110 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
113 /* A helper to initialize an op error inside a
114 * provided chunk, as most cause codes will be embedded inside an
117 void sctp_init_cause(struct sctp_chunk
*chunk
, __be16 cause_code
,
123 /* Cause code constants are now defined in network order. */
124 err
.cause
= cause_code
;
125 len
= sizeof(sctp_errhdr_t
) + paylen
;
126 err
.length
= htons(len
);
127 chunk
->subh
.err_hdr
= sctp_addto_chunk(chunk
, sizeof(sctp_errhdr_t
), &err
);
130 /* A helper to initialize an op error inside a
131 * provided chunk, as most cause codes will be embedded inside an
132 * abort chunk. Differs from sctp_init_cause in that it won't oops
133 * if there isn't enough space in the op error chunk
135 int sctp_init_cause_fixed(struct sctp_chunk
*chunk
, __be16 cause_code
,
141 /* Cause code constants are now defined in network order. */
142 err
.cause
= cause_code
;
143 len
= sizeof(sctp_errhdr_t
) + paylen
;
144 err
.length
= htons(len
);
146 if (skb_tailroom(chunk
->skb
) < len
)
148 chunk
->subh
.err_hdr
= sctp_addto_chunk_fixed(chunk
,
149 sizeof(sctp_errhdr_t
),
153 /* 3.3.2 Initiation (INIT) (1)
155 * This chunk is used to initiate a SCTP association between two
156 * endpoints. The format of the INIT chunk is shown below:
159 * 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
160 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
161 * | Type = 1 | Chunk Flags | Chunk Length |
162 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
164 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
165 * | Advertised Receiver Window Credit (a_rwnd) |
166 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
167 * | Number of Outbound Streams | Number of Inbound Streams |
168 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
170 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
172 * / Optional/Variable-Length Parameters /
174 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
177 * The INIT chunk contains the following parameters. Unless otherwise
178 * noted, each parameter MUST only be included once in the INIT chunk.
180 * Fixed Parameters Status
181 * ----------------------------------------------
182 * Initiate Tag Mandatory
183 * Advertised Receiver Window Credit Mandatory
184 * Number of Outbound Streams Mandatory
185 * Number of Inbound Streams Mandatory
186 * Initial TSN Mandatory
188 * Variable Parameters Status Type Value
189 * -------------------------------------------------------------
190 * IPv4 Address (Note 1) Optional 5
191 * IPv6 Address (Note 1) Optional 6
192 * Cookie Preservative Optional 9
193 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
194 * Host Name Address (Note 3) Optional 11
195 * Supported Address Types (Note 4) Optional 12
197 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
198 const struct sctp_bind_addr
*bp
,
199 gfp_t gfp
, int vparam_len
)
202 union sctp_params addrs
;
204 struct sctp_chunk
*retval
= NULL
;
205 int num_types
, addrs_len
= 0;
206 struct sctp_sock
*sp
;
207 sctp_supported_addrs_param_t sat
;
209 sctp_adaptation_ind_param_t aiparam
;
210 sctp_supported_ext_param_t ext_param
;
213 sctp_paramhdr_t
*auth_chunks
= NULL
,
216 /* RFC 2960 3.3.2 Initiation (INIT) (1)
218 * Note 1: The INIT chunks can contain multiple addresses that
219 * can be IPv4 and/or IPv6 in any combination.
223 /* Convert the provided bind address list to raw format. */
224 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
226 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
227 init
.a_rwnd
= htonl(asoc
->rwnd
);
228 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
229 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
230 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
232 /* How many address types are needed? */
233 sp
= sctp_sk(asoc
->base
.sk
);
234 num_types
= sp
->pf
->supported_addrs(sp
, types
);
236 chunksize
= sizeof(init
) + addrs_len
;
237 chunksize
+= WORD_ROUND(SCTP_SAT_LEN(num_types
));
238 chunksize
+= sizeof(ecap_param
);
240 if (sctp_prsctp_enable
)
241 chunksize
+= sizeof(prsctp_param
);
243 /* ADDIP: Section 4.2.7:
244 * An implementation supporting this extension [ADDIP] MUST list
245 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
246 * INIT-ACK parameters.
248 if (sctp_addip_enable
) {
249 extensions
[num_ext
] = SCTP_CID_ASCONF
;
250 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
254 if (sp
->adaptation_ind
)
255 chunksize
+= sizeof(aiparam
);
257 chunksize
+= vparam_len
;
259 /* Account for AUTH related parameters */
260 if (sctp_auth_enable
) {
261 /* Add random parameter length*/
262 chunksize
+= sizeof(asoc
->c
.auth_random
);
264 /* Add HMACS parameter length if any were defined */
265 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
266 if (auth_hmacs
->length
)
267 chunksize
+= WORD_ROUND(ntohs(auth_hmacs
->length
));
271 /* Add CHUNKS parameter length */
272 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
273 if (auth_chunks
->length
)
274 chunksize
+= WORD_ROUND(ntohs(auth_chunks
->length
));
278 extensions
[num_ext
] = SCTP_CID_AUTH
;
282 /* If we have any extensions to report, account for that */
284 chunksize
+= WORD_ROUND(sizeof(sctp_supported_ext_param_t
) +
287 /* RFC 2960 3.3.2 Initiation (INIT) (1)
289 * Note 3: An INIT chunk MUST NOT contain more than one Host
290 * Name address parameter. Moreover, the sender of the INIT
291 * MUST NOT combine any other address types with the Host Name
292 * address in the INIT. The receiver of INIT MUST ignore any
293 * other address types if the Host Name address parameter is
294 * present in the received INIT chunk.
296 * PLEASE DO NOT FIXME [This version does not support Host Name.]
299 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT
, 0, chunksize
);
303 retval
->subh
.init_hdr
=
304 sctp_addto_chunk(retval
, sizeof(init
), &init
);
305 retval
->param_hdr
.v
=
306 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
308 /* RFC 2960 3.3.2 Initiation (INIT) (1)
310 * Note 4: This parameter, when present, specifies all the
311 * address types the sending endpoint can support. The absence
312 * of this parameter indicates that the sending endpoint can
313 * support any address type.
315 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
316 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
317 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
318 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
320 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
322 /* Add the supported extensions parameter. Be nice and add this
323 * fist before addiding the parameters for the extensions themselves
326 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
327 ext_param
.param_hdr
.length
=
328 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
329 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
331 sctp_addto_param(retval
, num_ext
, extensions
);
334 if (sctp_prsctp_enable
)
335 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
337 if (sp
->adaptation_ind
) {
338 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
339 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
340 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
341 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
344 /* Add SCTP-AUTH chunks to the parameter list */
345 if (sctp_auth_enable
) {
346 sctp_addto_chunk(retval
, sizeof(asoc
->c
.auth_random
),
347 asoc
->c
.auth_random
);
349 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
352 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
360 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
361 const struct sctp_chunk
*chunk
,
362 gfp_t gfp
, int unkparam_len
)
364 sctp_inithdr_t initack
;
365 struct sctp_chunk
*retval
;
366 union sctp_params addrs
;
367 struct sctp_sock
*sp
;
369 sctp_cookie_param_t
*cookie
;
372 sctp_adaptation_ind_param_t aiparam
;
373 sctp_supported_ext_param_t ext_param
;
376 sctp_paramhdr_t
*auth_chunks
= NULL
,
382 /* Note: there may be no addresses to embed. */
383 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
385 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
386 initack
.a_rwnd
= htonl(asoc
->rwnd
);
387 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
388 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
389 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
391 /* FIXME: We really ought to build the cookie right
392 * into the packet instead of allocating more fresh memory.
394 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
399 /* Calculate the total size of allocation, include the reserved
400 * space for reporting unknown parameters if it is specified.
402 sp
= sctp_sk(asoc
->base
.sk
);
403 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
405 /* Tell peer that we'll do ECN only if peer advertised such cap. */
406 if (asoc
->peer
.ecn_capable
)
407 chunksize
+= sizeof(ecap_param
);
409 if (asoc
->peer
.prsctp_capable
)
410 chunksize
+= sizeof(prsctp_param
);
412 if (asoc
->peer
.asconf_capable
) {
413 extensions
[num_ext
] = SCTP_CID_ASCONF
;
414 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
418 if (sp
->adaptation_ind
)
419 chunksize
+= sizeof(aiparam
);
421 if (asoc
->peer
.auth_capable
) {
422 auth_random
= (sctp_paramhdr_t
*)asoc
->c
.auth_random
;
423 chunksize
+= ntohs(auth_random
->length
);
425 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
426 if (auth_hmacs
->length
)
427 chunksize
+= WORD_ROUND(ntohs(auth_hmacs
->length
));
431 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
432 if (auth_chunks
->length
)
433 chunksize
+= WORD_ROUND(ntohs(auth_chunks
->length
));
437 extensions
[num_ext
] = SCTP_CID_AUTH
;
442 chunksize
+= WORD_ROUND(sizeof(sctp_supported_ext_param_t
) +
445 /* Now allocate and fill out the chunk. */
446 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
);
450 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
452 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
453 * HEARTBEAT ACK, * etc.) to the same destination transport
454 * address from which it received the DATA or control chunk
455 * to which it is replying.
457 * [INIT ACK back to where the INIT came from.]
459 retval
->transport
= chunk
->transport
;
461 retval
->subh
.init_hdr
=
462 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
463 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
464 sctp_addto_chunk(retval
, cookie_len
, cookie
);
465 if (asoc
->peer
.ecn_capable
)
466 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
468 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
469 ext_param
.param_hdr
.length
=
470 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
471 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
473 sctp_addto_param(retval
, num_ext
, extensions
);
475 if (asoc
->peer
.prsctp_capable
)
476 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
478 if (sp
->adaptation_ind
) {
479 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
480 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
481 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
482 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
485 if (asoc
->peer
.auth_capable
) {
486 sctp_addto_chunk(retval
, ntohs(auth_random
->length
),
489 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
492 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
496 /* We need to remove the const qualifier at this point. */
497 retval
->asoc
= (struct sctp_association
*) asoc
;
506 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
508 * This chunk is used only during the initialization of an association.
509 * It is sent by the initiator of an association to its peer to complete
510 * the initialization process. This chunk MUST precede any DATA chunk
511 * sent within the association, but MAY be bundled with one or more DATA
512 * chunks in the same packet.
515 * 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
516 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
517 * | Type = 10 |Chunk Flags | Length |
518 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
521 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
525 * Set to zero on transmit and ignored on receipt.
527 * Length: 16 bits (unsigned integer)
529 * Set to the size of the chunk in bytes, including the 4 bytes of
530 * the chunk header and the size of the Cookie.
532 * Cookie: variable size
534 * This field must contain the exact cookie received in the
535 * State Cookie parameter from the previous INIT ACK.
537 * An implementation SHOULD make the cookie as small as possible
538 * to insure interoperability.
540 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
541 const struct sctp_chunk
*chunk
)
543 struct sctp_chunk
*retval
;
547 cookie
= asoc
->peer
.cookie
;
548 cookie_len
= asoc
->peer
.cookie_len
;
550 /* Build a cookie echo chunk. */
551 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ECHO
, 0, cookie_len
);
554 retval
->subh
.cookie_hdr
=
555 sctp_addto_chunk(retval
, cookie_len
, cookie
);
557 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
559 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
560 * HEARTBEAT ACK, * etc.) to the same destination transport
561 * address from which it * received the DATA or control chunk
562 * to which it is replying.
564 * [COOKIE ECHO back to where the INIT ACK came from.]
567 retval
->transport
= chunk
->transport
;
573 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
575 * This chunk is used only during the initialization of an
576 * association. It is used to acknowledge the receipt of a COOKIE
577 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
578 * within the association, but MAY be bundled with one or more DATA
579 * chunks or SACK chunk in the same SCTP packet.
582 * 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
583 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
584 * | Type = 11 |Chunk Flags | Length = 4 |
585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
587 * Chunk Flags: 8 bits
589 * Set to zero on transmit and ignored on receipt.
591 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
592 const struct sctp_chunk
*chunk
)
594 struct sctp_chunk
*retval
;
596 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0);
598 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
600 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
601 * HEARTBEAT ACK, * etc.) to the same destination transport
602 * address from which it * received the DATA or control chunk
603 * to which it is replying.
605 * [COOKIE ACK back to where the COOKIE ECHO came from.]
608 retval
->transport
= chunk
->transport
;
614 * Appendix A: Explicit Congestion Notification:
617 * RFC 2481 details a specific bit for a sender to send in the header of
618 * its next outbound TCP segment to indicate to its peer that it has
619 * reduced its congestion window. This is termed the CWR bit. For
620 * SCTP the same indication is made by including the CWR chunk.
621 * This chunk contains one data element, i.e. the TSN number that
622 * was sent in the ECNE chunk. This element represents the lowest
623 * TSN number in the datagram that was originally marked with the
627 * 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
628 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
629 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
630 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
631 * | Lowest TSN Number |
632 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
634 * Note: The CWR is considered a Control chunk.
636 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
637 const __u32 lowest_tsn
,
638 const struct sctp_chunk
*chunk
)
640 struct sctp_chunk
*retval
;
643 cwr
.lowest_tsn
= htonl(lowest_tsn
);
644 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_CWR
, 0,
645 sizeof(sctp_cwrhdr_t
));
650 retval
->subh
.ecn_cwr_hdr
=
651 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
653 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
655 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
656 * HEARTBEAT ACK, * etc.) to the same destination transport
657 * address from which it * received the DATA or control chunk
658 * to which it is replying.
660 * [Report a reduced congestion window back to where the ECNE
664 retval
->transport
= chunk
->transport
;
670 /* Make an ECNE chunk. This is a congestion experienced report. */
671 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
672 const __u32 lowest_tsn
)
674 struct sctp_chunk
*retval
;
677 ecne
.lowest_tsn
= htonl(lowest_tsn
);
678 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_ECNE
, 0,
679 sizeof(sctp_ecnehdr_t
));
682 retval
->subh
.ecne_hdr
=
683 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
689 /* Make a DATA chunk for the given association from the provided
690 * parameters. However, do not populate the data payload.
692 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
693 const struct sctp_sndrcvinfo
*sinfo
,
694 int data_len
, __u8 flags
, __u16 ssn
)
696 struct sctp_chunk
*retval
;
697 struct sctp_datahdr dp
;
700 /* We assign the TSN as LATE as possible, not here when
701 * creating the chunk.
704 dp
.stream
= htons(sinfo
->sinfo_stream
);
705 dp
.ppid
= sinfo
->sinfo_ppid
;
707 /* Set the flags for an unordered send. */
708 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
709 flags
|= SCTP_DATA_UNORDERED
;
714 chunk_len
= sizeof(dp
) + data_len
;
715 retval
= sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, chunk_len
);
719 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
720 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
726 /* Create a selective ackowledgement (SACK) for the given
727 * association. This reports on which TSN's we've seen to date,
728 * including duplicates and gaps.
730 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
732 struct sctp_chunk
*retval
;
733 struct sctp_sackhdr sack
;
736 __u16 num_gabs
, num_dup_tsns
;
737 struct sctp_association
*aptr
= (struct sctp_association
*)asoc
;
738 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
739 struct sctp_gap_ack_block gabs
[SCTP_MAX_GABS
];
740 struct sctp_transport
*trans
;
742 memset(gabs
, 0, sizeof(gabs
));
743 ctsn
= sctp_tsnmap_get_ctsn(map
);
744 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn
);
746 /* How much room is needed in the chunk? */
747 num_gabs
= sctp_tsnmap_num_gabs(map
, gabs
);
748 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
750 /* Initialize the SACK header. */
751 sack
.cum_tsn_ack
= htonl(ctsn
);
752 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
753 sack
.num_gap_ack_blocks
= htons(num_gabs
);
754 sack
.num_dup_tsns
= htons(num_dup_tsns
);
757 + sizeof(struct sctp_gap_ack_block
) * num_gabs
758 + sizeof(__u32
) * num_dup_tsns
;
760 /* Create the chunk. */
761 retval
= sctp_make_chunk(asoc
, SCTP_CID_SACK
, 0, len
);
765 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
767 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
768 * HEARTBEAT ACK, etc.) to the same destination transport
769 * address from which it received the DATA or control chunk to
770 * which it is replying. This rule should also be followed if
771 * the endpoint is bundling DATA chunks together with the
774 * However, when acknowledging multiple DATA chunks received
775 * in packets from different source addresses in a single
776 * SACK, the SACK chunk may be transmitted to one of the
777 * destination transport addresses from which the DATA or
778 * control chunks being acknowledged were received.
780 * [BUG: We do not implement the following paragraph.
781 * Perhaps we should remember the last transport we used for a
782 * SACK and avoid that (if possible) if we have seen any
783 * duplicates. --piggy]
785 * When a receiver of a duplicate DATA chunk sends a SACK to a
786 * multi- homed endpoint it MAY be beneficial to vary the
787 * destination address and not use the source address of the
788 * DATA chunk. The reason being that receiving a duplicate
789 * from a multi-homed endpoint might indicate that the return
790 * path (as specified in the source address of the DATA chunk)
791 * for the SACK is broken.
793 * [Send to the address from which we last received a DATA chunk.]
795 retval
->transport
= asoc
->peer
.last_data_from
;
797 retval
->subh
.sack_hdr
=
798 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
800 /* Add the gap ack block information. */
802 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
805 /* Add the duplicate TSN information. */
807 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
808 sctp_tsnmap_get_dups(map
));
810 /* Once we have a sack generated, check to see what our sack
811 * generation is, if its 0, reset the transports to 0, and reset
812 * the association generation to 1
814 * The idea is that zero is never used as a valid generation for the
815 * association so no transport will match after a wrap event like this,
816 * Until the next sack
818 if (++aptr
->peer
.sack_generation
== 0) {
819 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
821 trans
->sack_generation
= 0;
822 aptr
->peer
.sack_generation
= 1;
828 /* Make a SHUTDOWN chunk. */
829 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
830 const struct sctp_chunk
*chunk
)
832 struct sctp_chunk
*retval
;
833 sctp_shutdownhdr_t shut
;
836 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
837 shut
.cum_tsn_ack
= htonl(ctsn
);
839 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN
, 0,
840 sizeof(sctp_shutdownhdr_t
));
844 retval
->subh
.shutdown_hdr
=
845 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
848 retval
->transport
= chunk
->transport
;
853 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
854 const struct sctp_chunk
*chunk
)
856 struct sctp_chunk
*retval
;
858 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0);
860 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
862 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
863 * HEARTBEAT ACK, * etc.) to the same destination transport
864 * address from which it * received the DATA or control chunk
865 * to which it is replying.
867 * [ACK back to where the SHUTDOWN came from.]
870 retval
->transport
= chunk
->transport
;
875 struct sctp_chunk
*sctp_make_shutdown_complete(
876 const struct sctp_association
*asoc
,
877 const struct sctp_chunk
*chunk
)
879 struct sctp_chunk
*retval
;
882 /* Set the T-bit if we have no association (vtag will be
885 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
887 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
, 0);
889 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
891 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
892 * HEARTBEAT ACK, * etc.) to the same destination transport
893 * address from which it * received the DATA or control chunk
894 * to which it is replying.
896 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
900 retval
->transport
= chunk
->transport
;
905 /* Create an ABORT. Note that we set the T bit if we have no
906 * association, except when responding to an INIT (sctpimpguide 2.41).
908 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
909 const struct sctp_chunk
*chunk
,
912 struct sctp_chunk
*retval
;
915 /* Set the T-bit if we have no association and 'chunk' is not
916 * an INIT (vtag will be reflected).
919 if (chunk
&& chunk
->chunk_hdr
&&
920 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
923 flags
= SCTP_CHUNK_FLAG_T
;
926 retval
= sctp_make_chunk(asoc
, SCTP_CID_ABORT
, flags
, hint
);
928 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
930 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
931 * HEARTBEAT ACK, * etc.) to the same destination transport
932 * address from which it * received the DATA or control chunk
933 * to which it is replying.
935 * [ABORT back to where the offender came from.]
938 retval
->transport
= chunk
->transport
;
943 /* Helper to create ABORT with a NO_USER_DATA error. */
944 struct sctp_chunk
*sctp_make_abort_no_data(
945 const struct sctp_association
*asoc
,
946 const struct sctp_chunk
*chunk
, __u32 tsn
)
948 struct sctp_chunk
*retval
;
951 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
957 /* Put the tsn back into network byte order. */
958 payload
= htonl(tsn
);
959 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
960 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
962 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
964 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
965 * HEARTBEAT ACK, * etc.) to the same destination transport
966 * address from which it * received the DATA or control chunk
967 * to which it is replying.
969 * [ABORT back to where the offender came from.]
972 retval
->transport
= chunk
->transport
;
978 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
979 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
980 const struct msghdr
*msg
,
983 struct sctp_chunk
*retval
;
984 void *payload
= NULL
;
987 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
992 /* Put the msg_iov together into payload. */
993 payload
= kmalloc(paylen
, GFP_KERNEL
);
997 err
= memcpy_fromiovec(payload
, msg
->msg_iov
, paylen
);
1002 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
1003 sctp_addto_chunk(retval
, paylen
, payload
);
1013 sctp_chunk_free(retval
);
1019 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1022 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
1026 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1028 target
= skb_put(chunk
->skb
, len
);
1031 memcpy(target
, data
, len
);
1033 memset(target
, 0, len
);
1035 /* Adjust the chunk length field. */
1036 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
1037 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1042 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1043 struct sctp_chunk
*sctp_make_abort_violation(
1044 const struct sctp_association
*asoc
,
1045 const struct sctp_chunk
*chunk
,
1046 const __u8
*payload
,
1047 const size_t paylen
)
1049 struct sctp_chunk
*retval
;
1050 struct sctp_paramhdr phdr
;
1052 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
1053 + sizeof(sctp_paramhdr_t
));
1057 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
1058 + sizeof(sctp_paramhdr_t
));
1060 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
1061 phdr
.length
= chunk
->chunk_hdr
->length
;
1062 sctp_addto_chunk(retval
, paylen
, payload
);
1063 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
1069 struct sctp_chunk
*sctp_make_violation_paramlen(
1070 const struct sctp_association
*asoc
,
1071 const struct sctp_chunk
*chunk
,
1072 struct sctp_paramhdr
*param
)
1074 struct sctp_chunk
*retval
;
1075 static const char error
[] = "The following parameter had invalid length:";
1076 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
) +
1077 sizeof(sctp_paramhdr_t
);
1079 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1083 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
,
1084 sizeof(error
) + sizeof(sctp_paramhdr_t
));
1085 sctp_addto_chunk(retval
, sizeof(error
), error
);
1086 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), param
);
1092 /* Make a HEARTBEAT chunk. */
1093 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
1094 const struct sctp_transport
*transport
)
1096 struct sctp_chunk
*retval
;
1097 sctp_sender_hb_info_t hbinfo
;
1099 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT
, 0, sizeof(hbinfo
));
1104 hbinfo
.param_hdr
.type
= SCTP_PARAM_HEARTBEAT_INFO
;
1105 hbinfo
.param_hdr
.length
= htons(sizeof(sctp_sender_hb_info_t
));
1106 hbinfo
.daddr
= transport
->ipaddr
;
1107 hbinfo
.sent_at
= jiffies
;
1108 hbinfo
.hb_nonce
= transport
->hb_nonce
;
1110 /* Cast away the 'const', as this is just telling the chunk
1111 * what transport it belongs to.
1113 retval
->transport
= (struct sctp_transport
*) transport
;
1114 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, sizeof(hbinfo
),
1121 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
1122 const struct sctp_chunk
*chunk
,
1123 const void *payload
, const size_t paylen
)
1125 struct sctp_chunk
*retval
;
1127 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
);
1131 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1133 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1135 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1136 * HEARTBEAT ACK, * etc.) to the same destination transport
1137 * address from which it * received the DATA or control chunk
1138 * to which it is replying.
1140 * [HBACK back to where the HEARTBEAT came from.]
1143 retval
->transport
= chunk
->transport
;
1149 /* Create an Operation Error chunk with the specified space reserved.
1150 * This routine can be used for containing multiple causes in the chunk.
1152 static struct sctp_chunk
*sctp_make_op_error_space(
1153 const struct sctp_association
*asoc
,
1154 const struct sctp_chunk
*chunk
,
1157 struct sctp_chunk
*retval
;
1159 retval
= sctp_make_chunk(asoc
, SCTP_CID_ERROR
, 0,
1160 sizeof(sctp_errhdr_t
) + size
);
1164 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1166 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1167 * HEARTBEAT ACK, etc.) to the same destination transport
1168 * address from which it received the DATA or control chunk
1169 * to which it is replying.
1173 retval
->transport
= chunk
->transport
;
1179 /* Create an Operation Error chunk of a fixed size,
1180 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1181 * This is a helper function to allocate an error chunk for
1182 * for those invalid parameter codes in which we may not want
1183 * to report all the errors, if the incomming chunk is large
1185 static inline struct sctp_chunk
*sctp_make_op_error_fixed(
1186 const struct sctp_association
*asoc
,
1187 const struct sctp_chunk
*chunk
)
1189 size_t size
= asoc
? asoc
->pathmtu
: 0;
1192 size
= SCTP_DEFAULT_MAXSEGMENT
;
1194 return sctp_make_op_error_space(asoc
, chunk
, size
);
1197 /* Create an Operation Error chunk. */
1198 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1199 const struct sctp_chunk
*chunk
,
1200 __be16 cause_code
, const void *payload
,
1201 size_t paylen
, size_t reserve_tail
)
1203 struct sctp_chunk
*retval
;
1205 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
+ reserve_tail
);
1209 sctp_init_cause(retval
, cause_code
, paylen
+ reserve_tail
);
1210 sctp_addto_chunk(retval
, paylen
, payload
);
1212 sctp_addto_param(retval
, reserve_tail
, NULL
);
1218 struct sctp_chunk
*sctp_make_auth(const struct sctp_association
*asoc
)
1220 struct sctp_chunk
*retval
;
1221 struct sctp_hmac
*hmac_desc
;
1222 struct sctp_authhdr auth_hdr
;
1225 /* Get the first hmac that the peer told us to use */
1226 hmac_desc
= sctp_auth_asoc_get_hmac(asoc
);
1227 if (unlikely(!hmac_desc
))
1230 retval
= sctp_make_chunk(asoc
, SCTP_CID_AUTH
, 0,
1231 hmac_desc
->hmac_len
+ sizeof(sctp_authhdr_t
));
1235 auth_hdr
.hmac_id
= htons(hmac_desc
->hmac_id
);
1236 auth_hdr
.shkey_id
= htons(asoc
->active_key_id
);
1238 retval
->subh
.auth_hdr
= sctp_addto_chunk(retval
, sizeof(sctp_authhdr_t
),
1241 hmac
= skb_put(retval
->skb
, hmac_desc
->hmac_len
);
1242 memset(hmac
, 0, hmac_desc
->hmac_len
);
1244 /* Adjust the chunk header to include the empty MAC */
1245 retval
->chunk_hdr
->length
=
1246 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1247 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1253 /********************************************************************
1254 * 2nd Level Abstractions
1255 ********************************************************************/
1257 /* Turn an skb into a chunk.
1258 * FIXME: Eventually move the structure directly inside the skb->cb[].
1260 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1261 const struct sctp_association
*asoc
,
1264 struct sctp_chunk
*retval
;
1266 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, GFP_ATOMIC
);
1272 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb
);
1275 INIT_LIST_HEAD(&retval
->list
);
1277 retval
->asoc
= (struct sctp_association
*)asoc
;
1278 retval
->has_tsn
= 0;
1279 retval
->has_ssn
= 0;
1280 retval
->rtt_in_progress
= 0;
1281 retval
->sent_at
= 0;
1282 retval
->singleton
= 1;
1283 retval
->end_of_packet
= 0;
1284 retval
->ecn_ce_done
= 0;
1285 retval
->pdiscard
= 0;
1287 /* sctpimpguide-05.txt Section 2.8.2
1288 * M1) Each time a new DATA chunk is transmitted
1289 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1290 * 'TSN.Missing.Report' count will be used to determine missing chunks
1291 * and when to fast retransmit.
1293 retval
->tsn_missing_report
= 0;
1294 retval
->tsn_gap_acked
= 0;
1295 retval
->fast_retransmit
= SCTP_CAN_FRTX
;
1297 /* If this is a fragmented message, track all fragments
1298 * of the message (for SEND_FAILED).
1302 /* Polish the bead hole. */
1303 INIT_LIST_HEAD(&retval
->transmitted_list
);
1304 INIT_LIST_HEAD(&retval
->frag_list
);
1305 SCTP_DBG_OBJCNT_INC(chunk
);
1306 atomic_set(&retval
->refcnt
, 1);
1312 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1313 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1314 union sctp_addr
*dest
)
1316 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1317 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1320 /* Extract the source address from a chunk. */
1321 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1323 /* If we have a known transport, use that. */
1324 if (chunk
->transport
) {
1325 return &chunk
->transport
->ipaddr
;
1327 /* Otherwise, extract it from the IP header. */
1328 return &chunk
->source
;
1332 /* Create a new chunk, setting the type and flags headers from the
1333 * arguments, reserving enough space for a 'paylen' byte payload.
1336 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
1337 __u8 type
, __u8 flags
, int paylen
)
1339 struct sctp_chunk
*retval
;
1340 sctp_chunkhdr_t
*chunk_hdr
;
1341 struct sk_buff
*skb
;
1344 /* No need to allocate LL here, as this is only a chunk. */
1345 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
),
1350 /* Make room for the chunk header. */
1351 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1352 chunk_hdr
->type
= type
;
1353 chunk_hdr
->flags
= flags
;
1354 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1356 sk
= asoc
? asoc
->base
.sk
: NULL
;
1357 retval
= sctp_chunkify(skb
, asoc
, sk
);
1363 retval
->chunk_hdr
= chunk_hdr
;
1364 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1366 /* Determine if the chunk needs to be authenticated */
1367 if (sctp_auth_send_cid(type
, asoc
))
1370 /* Set the skb to the belonging sock for accounting. */
1379 /* Release the memory occupied by a chunk. */
1380 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1382 BUG_ON(!list_empty(&chunk
->list
));
1383 list_del_init(&chunk
->transmitted_list
);
1385 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1386 dev_kfree_skb(chunk
->skb
);
1388 SCTP_DBG_OBJCNT_DEC(chunk
);
1389 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1392 /* Possibly, free the chunk. */
1393 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1395 /* Release our reference on the message tracker. */
1397 sctp_datamsg_put(chunk
->msg
);
1399 sctp_chunk_put(chunk
);
1402 /* Grab a reference to the chunk. */
1403 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1405 atomic_inc(&ch
->refcnt
);
1408 /* Release a reference to the chunk. */
1409 void sctp_chunk_put(struct sctp_chunk
*ch
)
1411 if (atomic_dec_and_test(&ch
->refcnt
))
1412 sctp_chunk_destroy(ch
);
1415 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1418 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1422 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1423 int padlen
= WORD_ROUND(chunklen
) - chunklen
;
1425 padding
= skb_put(chunk
->skb
, padlen
);
1426 target
= skb_put(chunk
->skb
, len
);
1428 memset(padding
, 0, padlen
);
1429 memcpy(target
, data
, len
);
1431 /* Adjust the chunk length field. */
1432 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1433 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1438 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1439 * space in the chunk
1441 void *sctp_addto_chunk_fixed(struct sctp_chunk
*chunk
,
1442 int len
, const void *data
)
1444 if (skb_tailroom(chunk
->skb
) >= len
)
1445 return sctp_addto_chunk(chunk
, len
, data
);
1450 /* Append bytes from user space to the end of a chunk. Will panic if
1451 * chunk is not big enough.
1452 * Returns a kernel err value.
1454 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int off
, int len
,
1460 /* Make room in chunk for data. */
1461 target
= skb_put(chunk
->skb
, len
);
1463 /* Copy data (whole iovec) into chunk */
1464 if ((err
= memcpy_fromiovecend(target
, data
, off
, len
)))
1467 /* Adjust the chunk length field. */
1468 chunk
->chunk_hdr
->length
=
1469 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1470 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1476 /* Helper function to assign a TSN if needed. This assumes that both
1477 * the data_hdr and association have already been assigned.
1479 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1481 struct sctp_datamsg
*msg
;
1482 struct sctp_chunk
*lchunk
;
1483 struct sctp_stream
*stream
;
1490 /* All fragments will be on the same stream */
1491 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1492 stream
= &chunk
->asoc
->ssnmap
->out
;
1494 /* Now assign the sequence number to the entire message.
1495 * All fragments must have the same stream sequence number.
1498 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1499 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1502 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1503 ssn
= sctp_ssn_next(stream
, sid
);
1505 ssn
= sctp_ssn_peek(stream
, sid
);
1508 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1509 lchunk
->has_ssn
= 1;
1513 /* Helper function to assign a TSN if needed. This assumes that both
1514 * the data_hdr and association have already been assigned.
1516 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1518 if (!chunk
->has_tsn
) {
1519 /* This is the last possible instant to
1522 chunk
->subh
.data_hdr
->tsn
=
1523 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1528 /* Create a CLOSED association to use with an incoming packet. */
1529 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1530 struct sctp_chunk
*chunk
,
1533 struct sctp_association
*asoc
;
1534 struct sk_buff
*skb
;
1538 /* Create the bare association. */
1539 scope
= sctp_scope(sctp_source(chunk
));
1540 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1545 /* Create an entry for the source address of the packet. */
1546 af
= sctp_get_af_specific(ipver2af(ip_hdr(skb
)->version
));
1549 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1554 sctp_association_free(asoc
);
1558 /* Build a cookie representing asoc.
1559 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1561 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1562 const struct sctp_association
*asoc
,
1563 const struct sctp_chunk
*init_chunk
,
1565 const __u8
*raw_addrs
, int addrs_len
)
1567 sctp_cookie_param_t
*retval
;
1568 struct sctp_signed_cookie
*cookie
;
1569 struct scatterlist sg
;
1570 int headersize
, bodysize
;
1571 unsigned int keylen
;
1574 /* Header size is static data prior to the actual cookie, including
1577 headersize
= sizeof(sctp_paramhdr_t
) +
1578 (sizeof(struct sctp_signed_cookie
) -
1579 sizeof(struct sctp_cookie
));
1580 bodysize
= sizeof(struct sctp_cookie
)
1581 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1583 /* Pad out the cookie to a multiple to make the signature
1584 * functions simpler to write.
1586 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1587 bodysize
+= SCTP_COOKIE_MULTIPLE
1588 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1589 *cookie_len
= headersize
+ bodysize
;
1591 /* Clear this memory since we are sending this data structure
1592 * out on the network.
1594 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1598 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1600 /* Set up the parameter header. */
1601 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1602 retval
->p
.length
= htons(*cookie_len
);
1604 /* Copy the cookie part of the association itself. */
1605 cookie
->c
= asoc
->c
;
1606 /* Save the raw address list length in the cookie. */
1607 cookie
->c
.raw_addr_list_len
= addrs_len
;
1609 /* Remember PR-SCTP capability. */
1610 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1612 /* Save adaptation indication in the cookie. */
1613 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1615 /* Set an expiration time for the cookie. */
1616 do_gettimeofday(&cookie
->c
.expiration
);
1617 TIMEVAL_ADD(asoc
->cookie_life
, cookie
->c
.expiration
);
1619 /* Copy the peer's init packet. */
1620 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1621 ntohs(init_chunk
->chunk_hdr
->length
));
1623 /* Copy the raw local address list of the association. */
1624 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1625 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1627 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1628 struct hash_desc desc
;
1630 /* Sign the message. */
1631 sg_init_one(&sg
, &cookie
->c
, bodysize
);
1632 keylen
= SCTP_SECRET_SIZE
;
1633 key
= (char *)ep
->secret_key
[ep
->current_key
];
1634 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1637 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1638 crypto_hash_digest(&desc
, &sg
, bodysize
, cookie
->signature
))
1651 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1652 struct sctp_association
*sctp_unpack_cookie(
1653 const struct sctp_endpoint
*ep
,
1654 const struct sctp_association
*asoc
,
1655 struct sctp_chunk
*chunk
, gfp_t gfp
,
1656 int *error
, struct sctp_chunk
**errp
)
1658 struct sctp_association
*retval
= NULL
;
1659 struct sctp_signed_cookie
*cookie
;
1660 struct sctp_cookie
*bear_cookie
;
1661 int headersize
, bodysize
, fixed_size
;
1662 __u8
*digest
= ep
->digest
;
1663 struct scatterlist sg
;
1664 unsigned int keylen
, len
;
1667 struct sk_buff
*skb
= chunk
->skb
;
1669 struct hash_desc desc
;
1671 /* Header size is static data prior to the actual cookie, including
1674 headersize
= sizeof(sctp_chunkhdr_t
) +
1675 (sizeof(struct sctp_signed_cookie
) -
1676 sizeof(struct sctp_cookie
));
1677 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1678 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1680 /* Verify that the chunk looks like it even has a cookie.
1681 * There must be enough room for our cookie and our peer's
1684 len
= ntohs(chunk
->chunk_hdr
->length
);
1685 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1688 /* Verify that the cookie has been padded out. */
1689 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1692 /* Process the cookie. */
1693 cookie
= chunk
->subh
.cookie_hdr
;
1694 bear_cookie
= &cookie
->c
;
1696 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1699 /* Check the signature. */
1700 keylen
= SCTP_SECRET_SIZE
;
1701 sg_init_one(&sg
, bear_cookie
, bodysize
);
1702 key
= (char *)ep
->secret_key
[ep
->current_key
];
1703 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1706 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1707 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1708 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1709 *error
= -SCTP_IERROR_NOMEM
;
1713 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1714 /* Try the previous key. */
1715 key
= (char *)ep
->secret_key
[ep
->last_key
];
1716 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1717 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1718 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1719 *error
= -SCTP_IERROR_NOMEM
;
1723 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1724 /* Yikes! Still bad signature! */
1725 *error
= -SCTP_IERROR_BAD_SIG
;
1731 /* IG Section 2.35.2:
1732 * 3) Compare the port numbers and the verification tag contained
1733 * within the COOKIE ECHO chunk to the actual port numbers and the
1734 * verification tag within the SCTP common header of the received
1735 * packet. If these values do not match the packet MUST be silently
1738 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1739 *error
= -SCTP_IERROR_BAD_TAG
;
1743 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1744 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1745 *error
= -SCTP_IERROR_BAD_PORTS
;
1749 /* Check to see if the cookie is stale. If there is already
1750 * an association, there is no need to check cookie's expiration
1751 * for init collision case of lost COOKIE ACK.
1752 * If skb has been timestamped, then use the stamp, otherwise
1753 * use current time. This introduces a small possibility that
1754 * that a cookie may be considered expired, but his would only slow
1755 * down the new association establishment instead of every packet.
1757 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1758 skb_get_timestamp(skb
, &tv
);
1760 do_gettimeofday(&tv
);
1762 if (!asoc
&& tv_lt(bear_cookie
->expiration
, tv
)) {
1764 * Section 3.3.10.3 Stale Cookie Error (3)
1768 * Stale Cookie Error: Indicates the receipt of a valid State
1769 * Cookie that has expired.
1771 len
= ntohs(chunk
->chunk_hdr
->length
);
1772 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1774 suseconds_t usecs
= (tv
.tv_sec
-
1775 bear_cookie
->expiration
.tv_sec
) * 1000000L +
1776 tv
.tv_usec
- bear_cookie
->expiration
.tv_usec
;
1777 __be32 n
= htonl(usecs
);
1779 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1781 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1782 *error
= -SCTP_IERROR_STALE_COOKIE
;
1784 *error
= -SCTP_IERROR_NOMEM
;
1789 /* Make a new base association. */
1790 scope
= sctp_scope(sctp_source(chunk
));
1791 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1793 *error
= -SCTP_IERROR_NOMEM
;
1797 /* Set up our peer's port number. */
1798 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1800 /* Populate the association from the cookie. */
1801 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1803 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1805 *error
= -SCTP_IERROR_NOMEM
;
1809 /* Also, add the destination address. */
1810 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1811 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1812 SCTP_ADDR_SRC
, GFP_ATOMIC
);
1815 retval
->next_tsn
= retval
->c
.initial_tsn
;
1816 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1817 retval
->addip_serial
= retval
->c
.initial_tsn
;
1818 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1819 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1820 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1822 /* The INIT stuff will be done by the side effects. */
1827 sctp_association_free(retval
);
1832 /* Yikes! The packet is either corrupt or deliberately
1835 *error
= -SCTP_IERROR_MALFORMED
;
1839 /********************************************************************
1840 * 3rd Level Abstractions
1841 ********************************************************************/
1843 struct __sctp_missing
{
1849 * Report a missing mandatory parameter.
1851 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1852 sctp_param_t paramtype
,
1853 struct sctp_chunk
*chunk
,
1854 struct sctp_chunk
**errp
)
1856 struct __sctp_missing report
;
1859 len
= WORD_ROUND(sizeof(report
));
1861 /* Make an ERROR chunk, preparing enough room for
1862 * returning multiple unknown parameters.
1865 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1868 report
.num_missing
= htonl(1);
1869 report
.type
= paramtype
;
1870 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1872 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1875 /* Stop processing this chunk. */
1879 /* Report an Invalid Mandatory Parameter. */
1880 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1881 struct sctp_chunk
*chunk
,
1882 struct sctp_chunk
**errp
)
1884 /* Invalid Mandatory Parameter Error has no payload. */
1887 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1890 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1892 /* Stop processing this chunk. */
1896 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1897 struct sctp_paramhdr
*param
,
1898 const struct sctp_chunk
*chunk
,
1899 struct sctp_chunk
**errp
)
1901 /* This is a fatal error. Any accumulated non-fatal errors are
1905 sctp_chunk_free(*errp
);
1907 /* Create an error chunk and fill it in with our payload. */
1908 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1914 /* Do not attempt to handle the HOST_NAME parm. However, do
1915 * send back an indicator to the peer.
1917 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1918 union sctp_params param
,
1919 struct sctp_chunk
*chunk
,
1920 struct sctp_chunk
**errp
)
1922 __u16 len
= ntohs(param
.p
->length
);
1924 /* Processing of the HOST_NAME parameter will generate an
1925 * ABORT. If we've accumulated any non-fatal errors, they
1926 * would be unrecognized parameters and we should not include
1927 * them in the ABORT.
1930 sctp_chunk_free(*errp
);
1932 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1935 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1936 sctp_addto_chunk(*errp
, len
, param
.v
);
1939 /* Stop processing this chunk. */
1943 static int sctp_verify_ext_param(union sctp_params param
)
1945 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1947 int have_asconf
= 0;
1950 for (i
= 0; i
< num_ext
; i
++) {
1951 switch (param
.ext
->chunks
[i
]) {
1955 case SCTP_CID_ASCONF
:
1956 case SCTP_CID_ASCONF_ACK
:
1962 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1963 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1964 * only if ADD-IP is turned on and we are not backward-compatible
1967 if (sctp_addip_noauth
)
1970 if (sctp_addip_enable
&& !have_auth
&& have_asconf
)
1976 static void sctp_process_ext_param(struct sctp_association
*asoc
,
1977 union sctp_params param
)
1979 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1982 for (i
= 0; i
< num_ext
; i
++) {
1983 switch (param
.ext
->chunks
[i
]) {
1984 case SCTP_CID_FWD_TSN
:
1985 if (sctp_prsctp_enable
&&
1986 !asoc
->peer
.prsctp_capable
)
1987 asoc
->peer
.prsctp_capable
= 1;
1990 /* if the peer reports AUTH, assume that he
1993 if (sctp_auth_enable
)
1994 asoc
->peer
.auth_capable
= 1;
1996 case SCTP_CID_ASCONF
:
1997 case SCTP_CID_ASCONF_ACK
:
1998 if (sctp_addip_enable
)
1999 asoc
->peer
.asconf_capable
= 1;
2007 /* RFC 3.2.1 & the Implementers Guide 2.2.
2009 * The Parameter Types are encoded such that the
2010 * highest-order two bits specify the action that must be
2011 * taken if the processing endpoint does not recognize the
2014 * 00 - Stop processing this parameter; do not process any further
2015 * parameters within this chunk
2017 * 01 - Stop processing this parameter, do not process any further
2018 * parameters within this chunk, and report the unrecognized
2019 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2021 * 10 - Skip this parameter and continue processing.
2023 * 11 - Skip this parameter and continue processing but
2024 * report the unrecognized parameter in an
2025 * 'Unrecognized Parameter' ERROR chunk.
2028 * SCTP_IERROR_NO_ERROR - continue with the chunk
2029 * SCTP_IERROR_ERROR - stop and report an error.
2030 * SCTP_IERROR_NOMEME - out of memory.
2032 static sctp_ierror_t
sctp_process_unk_param(const struct sctp_association
*asoc
,
2033 union sctp_params param
,
2034 struct sctp_chunk
*chunk
,
2035 struct sctp_chunk
**errp
)
2037 int retval
= SCTP_IERROR_NO_ERROR
;
2039 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2040 case SCTP_PARAM_ACTION_DISCARD
:
2041 retval
= SCTP_IERROR_ERROR
;
2043 case SCTP_PARAM_ACTION_SKIP
:
2045 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2046 retval
= SCTP_IERROR_ERROR
;
2048 case SCTP_PARAM_ACTION_SKIP_ERR
:
2049 /* Make an ERROR chunk, preparing enough room for
2050 * returning multiple unknown parameters.
2053 *errp
= sctp_make_op_error_fixed(asoc
, chunk
);
2056 if (!sctp_init_cause_fixed(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2057 WORD_ROUND(ntohs(param
.p
->length
))))
2058 sctp_addto_chunk_fixed(*errp
,
2059 WORD_ROUND(ntohs(param
.p
->length
)),
2062 /* If there is no memory for generating the ERROR
2063 * report as specified, an ABORT will be triggered
2064 * to the peer and the association won't be
2067 retval
= SCTP_IERROR_NOMEM
;
2077 /* Verify variable length parameters
2079 * SCTP_IERROR_ABORT - trigger an ABORT
2080 * SCTP_IERROR_NOMEM - out of memory (abort)
2081 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2082 * SCTP_IERROR_NO_ERROR - continue with the chunk
2084 static sctp_ierror_t
sctp_verify_param(const struct sctp_association
*asoc
,
2085 union sctp_params param
,
2087 struct sctp_chunk
*chunk
,
2088 struct sctp_chunk
**err_chunk
)
2090 struct sctp_hmac_algo_param
*hmacs
;
2091 int retval
= SCTP_IERROR_NO_ERROR
;
2092 __u16 n_elt
, id
= 0;
2095 /* FIXME - This routine is not looking at each parameter per the
2096 * chunk type, i.e., unrecognized parameters should be further
2097 * identified based on the chunk id.
2100 switch (param
.p
->type
) {
2101 case SCTP_PARAM_IPV4_ADDRESS
:
2102 case SCTP_PARAM_IPV6_ADDRESS
:
2103 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2104 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2105 case SCTP_PARAM_STATE_COOKIE
:
2106 case SCTP_PARAM_HEARTBEAT_INFO
:
2107 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2108 case SCTP_PARAM_ECN_CAPABLE
:
2109 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2112 case SCTP_PARAM_SUPPORTED_EXT
:
2113 if (!sctp_verify_ext_param(param
))
2114 return SCTP_IERROR_ABORT
;
2117 case SCTP_PARAM_SET_PRIMARY
:
2118 if (sctp_addip_enable
)
2122 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2123 /* Tell the peer, we won't support this param. */
2124 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2125 retval
= SCTP_IERROR_ABORT
;
2128 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2129 if (sctp_prsctp_enable
)
2133 case SCTP_PARAM_RANDOM
:
2134 if (!sctp_auth_enable
)
2137 /* SCTP-AUTH: Secion 6.1
2138 * If the random number is not 32 byte long the association
2139 * MUST be aborted. The ABORT chunk SHOULD contain the error
2140 * cause 'Protocol Violation'.
2142 if (SCTP_AUTH_RANDOM_LENGTH
!=
2143 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) {
2144 sctp_process_inv_paramlength(asoc
, param
.p
,
2146 retval
= SCTP_IERROR_ABORT
;
2150 case SCTP_PARAM_CHUNKS
:
2151 if (!sctp_auth_enable
)
2154 /* SCTP-AUTH: Section 3.2
2155 * The CHUNKS parameter MUST be included once in the INIT or
2156 * INIT-ACK chunk if the sender wants to receive authenticated
2157 * chunks. Its maximum length is 260 bytes.
2159 if (260 < ntohs(param
.p
->length
)) {
2160 sctp_process_inv_paramlength(asoc
, param
.p
,
2162 retval
= SCTP_IERROR_ABORT
;
2166 case SCTP_PARAM_HMAC_ALGO
:
2167 if (!sctp_auth_enable
)
2170 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2171 n_elt
= (ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) >> 1;
2173 /* SCTP-AUTH: Section 6.1
2174 * The HMAC algorithm based on SHA-1 MUST be supported and
2175 * included in the HMAC-ALGO parameter.
2177 for (i
= 0; i
< n_elt
; i
++) {
2178 id
= ntohs(hmacs
->hmac_ids
[i
]);
2180 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2184 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2185 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2187 retval
= SCTP_IERROR_ABORT
;
2192 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2193 ntohs(param
.p
->type
), cid
);
2194 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2200 /* Verify the INIT packet before we process it. */
2201 int sctp_verify_init(const struct sctp_association
*asoc
,
2203 sctp_init_chunk_t
*peer_init
,
2204 struct sctp_chunk
*chunk
,
2205 struct sctp_chunk
**errp
)
2207 union sctp_params param
;
2211 /* Verify stream values are non-zero. */
2212 if ((0 == peer_init
->init_hdr
.num_outbound_streams
) ||
2213 (0 == peer_init
->init_hdr
.num_inbound_streams
) ||
2214 (0 == peer_init
->init_hdr
.init_tag
) ||
2215 (SCTP_DEFAULT_MINWINDOW
> ntohl(peer_init
->init_hdr
.a_rwnd
))) {
2217 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2220 /* Check for missing mandatory parameters. */
2221 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2223 if (SCTP_PARAM_STATE_COOKIE
== param
.p
->type
)
2226 } /* for (loop through all parameters) */
2228 /* There is a possibility that a parameter length was bad and
2229 * in that case we would have stoped walking the parameters.
2230 * The current param.p would point at the bad one.
2231 * Current consensus on the mailing list is to generate a PROTOCOL
2232 * VIOLATION error. We build the ERROR chunk here and let the normal
2233 * error handling code build and send the packet.
2235 if (param
.v
!= (void*)chunk
->chunk_end
)
2236 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2238 /* The only missing mandatory param possible today is
2239 * the state cookie for an INIT-ACK chunk.
2241 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2242 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2245 /* Verify all the variable length parameters */
2246 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2248 result
= sctp_verify_param(asoc
, param
, cid
, chunk
, errp
);
2250 case SCTP_IERROR_ABORT
:
2251 case SCTP_IERROR_NOMEM
:
2253 case SCTP_IERROR_ERROR
:
2255 case SCTP_IERROR_NO_ERROR
:
2260 } /* for (loop through all parameters) */
2265 /* Unpack the parameters in an INIT packet into an association.
2266 * Returns 0 on failure, else success.
2267 * FIXME: This is an association method.
2269 int sctp_process_init(struct sctp_association
*asoc
, struct sctp_chunk
*chunk
,
2270 const union sctp_addr
*peer_addr
,
2271 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
2273 union sctp_params param
;
2274 struct sctp_transport
*transport
;
2275 struct list_head
*pos
, *temp
;
2277 union sctp_addr addr
;
2281 /* We must include the address that the INIT packet came from.
2282 * This is the only address that matters for an INIT packet.
2283 * When processing a COOKIE ECHO, we retrieve the from address
2284 * of the INIT from the cookie.
2287 /* This implementation defaults to making the first transport
2288 * added as the primary transport. The source address seems to
2289 * be a a better choice than any of the embedded addresses.
2291 if(!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2294 if (sctp_cmp_addr_exact(sctp_source(chunk
), peer_addr
))
2297 /* Process the initialization parameters. */
2298 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2299 if (!src_match
&& (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
2300 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)) {
2301 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2302 af
->from_addr_param(&addr
, param
.addr
,
2303 chunk
->sctp_hdr
->source
, 0);
2304 if (sctp_cmp_addr_exact(sctp_source(chunk
), &addr
))
2308 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2312 /* source address of chunk may not match any valid address */
2316 /* AUTH: After processing the parameters, make sure that we
2317 * have all the required info to potentially do authentications.
2319 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2320 !asoc
->peer
.peer_hmacs
))
2321 asoc
->peer
.auth_capable
= 0;
2323 /* In a non-backward compatible mode, if the peer claims
2324 * support for ADD-IP but not AUTH, the ADD-IP spec states
2325 * that we MUST ABORT the association. Section 6. The section
2326 * also give us an option to silently ignore the packet, which
2327 * is what we'll do here.
2329 if (!sctp_addip_noauth
&&
2330 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2331 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2333 SCTP_PARAM_SET_PRIMARY
);
2334 asoc
->peer
.asconf_capable
= 0;
2338 /* Walk list of transports, removing transports in the UNKNOWN state. */
2339 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2340 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2341 if (transport
->state
== SCTP_UNKNOWN
) {
2342 sctp_assoc_rm_peer(asoc
, transport
);
2346 /* The fixed INIT headers are always in network byte
2349 asoc
->peer
.i
.init_tag
=
2350 ntohl(peer_init
->init_hdr
.init_tag
);
2351 asoc
->peer
.i
.a_rwnd
=
2352 ntohl(peer_init
->init_hdr
.a_rwnd
);
2353 asoc
->peer
.i
.num_outbound_streams
=
2354 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2355 asoc
->peer
.i
.num_inbound_streams
=
2356 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2357 asoc
->peer
.i
.initial_tsn
=
2358 ntohl(peer_init
->init_hdr
.initial_tsn
);
2360 /* Apply the upper bounds for output streams based on peer's
2361 * number of inbound streams.
2363 if (asoc
->c
.sinit_num_ostreams
>
2364 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2365 asoc
->c
.sinit_num_ostreams
=
2366 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2369 if (asoc
->c
.sinit_max_instreams
>
2370 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2371 asoc
->c
.sinit_max_instreams
=
2372 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2375 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2376 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2378 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2379 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2381 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2382 cookie
= asoc
->peer
.cookie
;
2384 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2385 if (!asoc
->peer
.cookie
)
2389 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2390 * high (for example, implementations MAY use the size of the receiver
2391 * advertised window).
2393 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2395 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2398 /* Set up the TSN tracking pieces. */
2399 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2400 asoc
->peer
.i
.initial_tsn
, gfp
))
2403 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2405 * The stream sequence number in all the streams shall start
2406 * from 0 when the association is established. Also, when the
2407 * stream sequence number reaches the value 65535 the next
2408 * stream sequence number shall be set to 0.
2411 /* Allocate storage for the negotiated streams if it is not a temporary
2417 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
2418 asoc
->c
.sinit_num_ostreams
, gfp
);
2422 error
= sctp_assoc_set_id(asoc
, gfp
);
2427 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2429 * When an endpoint has an ASCONF signaled change to be sent to the
2430 * remote endpoint it should do the following:
2432 * A2) A serial number should be assigned to the Chunk. The serial
2433 * number should be a monotonically increasing number. All serial
2434 * numbers are defined to be initialized at the start of the
2435 * association to the same value as the Initial TSN.
2437 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2441 /* Release the transport structures. */
2442 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2443 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2444 if (transport
->state
!= SCTP_ACTIVE
)
2445 sctp_assoc_rm_peer(asoc
, transport
);
2453 /* Update asoc with the option described in param.
2455 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2457 * asoc is the association to update.
2458 * param is the variable length parameter to use for update.
2459 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2460 * If the current packet is an INIT we want to minimize the amount of
2461 * work we do. In particular, we should not build transport
2462 * structures for the addresses.
2464 static int sctp_process_param(struct sctp_association
*asoc
,
2465 union sctp_params param
,
2466 const union sctp_addr
*peer_addr
,
2469 union sctp_addr addr
;
2476 union sctp_addr_param
*addr_param
;
2477 struct sctp_transport
*t
;
2479 /* We maintain all INIT parameters in network byte order all the
2480 * time. This allows us to not worry about whether the parameters
2481 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2483 switch (param
.p
->type
) {
2484 case SCTP_PARAM_IPV6_ADDRESS
:
2485 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2489 case SCTP_PARAM_IPV4_ADDRESS
:
2490 /* v4 addresses are not allowed on v6-only socket */
2491 if (ipv6_only_sock(asoc
->base
.sk
))
2494 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2495 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2496 scope
= sctp_scope(peer_addr
);
2497 if (sctp_in_scope(&addr
, scope
))
2498 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2502 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2503 if (!sctp_cookie_preserve_enable
)
2506 stale
= ntohl(param
.life
->lifespan_increment
);
2508 /* Suggested Cookie Life span increment's unit is msec,
2511 asoc
->cookie_life
.tv_sec
+= stale
/ 1000;
2512 asoc
->cookie_life
.tv_usec
+= (stale
% 1000) * 1000;
2515 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2516 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2519 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2520 /* Turn off the default values first so we'll know which
2521 * ones are really set by the peer.
2523 asoc
->peer
.ipv4_address
= 0;
2524 asoc
->peer
.ipv6_address
= 0;
2526 /* Assume that peer supports the address family
2527 * by which it sends a packet.
2529 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2530 asoc
->peer
.ipv6_address
= 1;
2531 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2532 asoc
->peer
.ipv4_address
= 1;
2534 /* Cycle through address types; avoid divide by 0. */
2535 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2537 sat
/= sizeof(__u16
);
2539 for (i
= 0; i
< sat
; ++i
) {
2540 switch (param
.sat
->types
[i
]) {
2541 case SCTP_PARAM_IPV4_ADDRESS
:
2542 asoc
->peer
.ipv4_address
= 1;
2545 case SCTP_PARAM_IPV6_ADDRESS
:
2546 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2547 asoc
->peer
.ipv6_address
= 1;
2550 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2551 asoc
->peer
.hostname_address
= 1;
2554 default: /* Just ignore anything else. */
2560 case SCTP_PARAM_STATE_COOKIE
:
2561 asoc
->peer
.cookie_len
=
2562 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2563 asoc
->peer
.cookie
= param
.cookie
->body
;
2566 case SCTP_PARAM_HEARTBEAT_INFO
:
2567 /* Would be odd to receive, but it causes no problems. */
2570 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2571 /* Rejected during verify stage. */
2574 case SCTP_PARAM_ECN_CAPABLE
:
2575 asoc
->peer
.ecn_capable
= 1;
2578 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2579 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2582 case SCTP_PARAM_SET_PRIMARY
:
2583 if (!sctp_addip_enable
)
2586 addr_param
= param
.v
+ sizeof(sctp_addip_param_t
);
2588 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2589 af
->from_addr_param(&addr
, addr_param
,
2590 htons(asoc
->peer
.port
), 0);
2592 /* if the address is invalid, we can't process it.
2593 * XXX: see spec for what to do.
2595 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2598 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2602 sctp_assoc_set_primary(asoc
, t
);
2605 case SCTP_PARAM_SUPPORTED_EXT
:
2606 sctp_process_ext_param(asoc
, param
);
2609 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2610 if (sctp_prsctp_enable
) {
2611 asoc
->peer
.prsctp_capable
= 1;
2617 case SCTP_PARAM_RANDOM
:
2618 if (!sctp_auth_enable
)
2621 /* Save peer's random parameter */
2622 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2623 ntohs(param
.p
->length
), gfp
);
2624 if (!asoc
->peer
.peer_random
) {
2630 case SCTP_PARAM_HMAC_ALGO
:
2631 if (!sctp_auth_enable
)
2634 /* Save peer's HMAC list */
2635 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2636 ntohs(param
.p
->length
), gfp
);
2637 if (!asoc
->peer
.peer_hmacs
) {
2642 /* Set the default HMAC the peer requested*/
2643 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2646 case SCTP_PARAM_CHUNKS
:
2647 if (!sctp_auth_enable
)
2650 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2651 ntohs(param
.p
->length
), gfp
);
2652 if (!asoc
->peer
.peer_chunks
)
2657 /* Any unrecognized parameters should have been caught
2658 * and handled by sctp_verify_param() which should be
2659 * called prior to this routine. Simply log the error
2662 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2663 ntohs(param
.p
->type
), asoc
);
2670 /* Select a new verification tag. */
2671 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2673 /* I believe that this random number generator complies with RFC1750.
2674 * A tag of 0 is reserved for special cases (e.g. INIT).
2679 get_random_bytes(&x
, sizeof(__u32
));
2685 /* Select an initial TSN to send during startup. */
2686 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2690 get_random_bytes(&retval
, sizeof(__u32
));
2695 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2697 * 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
2698 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2699 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2700 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2702 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2703 * | Address Parameter |
2704 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2705 * | ASCONF Parameter #1 |
2706 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2710 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2711 * | ASCONF Parameter #N |
2712 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2714 * Address Parameter and other parameter will not be wrapped in this function
2716 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2717 union sctp_addr
*addr
,
2720 sctp_addiphdr_t asconf
;
2721 struct sctp_chunk
*retval
;
2722 int length
= sizeof(asconf
) + vparam_len
;
2723 union sctp_addr_param addrparam
;
2725 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2727 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2732 /* Create the chunk. */
2733 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF
, 0, length
);
2737 asconf
.serial
= htonl(asoc
->addip_serial
++);
2739 retval
->subh
.addip_hdr
=
2740 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2741 retval
->param_hdr
.v
=
2742 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2748 * 3.2.1 Add IP Address
2750 * 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
2751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2752 * | Type = 0xC001 | Length = Variable |
2753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2754 * | ASCONF-Request Correlation ID |
2755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2756 * | Address Parameter |
2757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2759 * 3.2.2 Delete IP Address
2761 * 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
2762 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2763 * | Type = 0xC002 | Length = Variable |
2764 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2765 * | ASCONF-Request Correlation ID |
2766 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2767 * | Address Parameter |
2768 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2771 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2772 union sctp_addr
*laddr
,
2773 struct sockaddr
*addrs
,
2777 sctp_addip_param_t param
;
2778 struct sctp_chunk
*retval
;
2779 union sctp_addr_param addr_param
;
2780 union sctp_addr
*addr
;
2783 int paramlen
= sizeof(param
);
2784 int addr_param_len
= 0;
2789 /* Get total length of all the address parameters. */
2791 for (i
= 0; i
< addrcnt
; i
++) {
2793 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2794 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2796 totallen
+= paramlen
;
2797 totallen
+= addr_param_len
;
2799 addr_buf
+= af
->sockaddr_len
;
2800 if (asoc
->asconf_addr_del_pending
&& !del_pickup
) {
2801 /* reuse the parameter length from the same scope one */
2802 totallen
+= paramlen
;
2803 totallen
+= addr_param_len
;
2805 SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen
);
2809 /* Create an asconf chunk with the required length. */
2810 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2814 /* Add the address parameters to the asconf chunk. */
2816 for (i
= 0; i
< addrcnt
; i
++) {
2818 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2819 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2820 param
.param_hdr
.type
= flags
;
2821 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2824 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2825 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2827 addr_buf
+= af
->sockaddr_len
;
2829 if (flags
== SCTP_PARAM_ADD_IP
&& del_pickup
) {
2830 addr
= asoc
->asconf_addr_del_pending
;
2831 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2832 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2833 param
.param_hdr
.type
= SCTP_PARAM_DEL_IP
;
2834 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2837 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2838 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2844 * 3.2.4 Set Primary IP Address
2846 * 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
2847 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2848 * | Type =0xC004 | Length = Variable |
2849 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2850 * | ASCONF-Request Correlation ID |
2851 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2852 * | Address Parameter |
2853 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2855 * Create an ASCONF chunk with Set Primary IP address parameter.
2857 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2858 union sctp_addr
*addr
)
2860 sctp_addip_param_t param
;
2861 struct sctp_chunk
*retval
;
2862 int len
= sizeof(param
);
2863 union sctp_addr_param addrparam
;
2865 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2867 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2872 /* Create the chunk and make asconf header. */
2873 retval
= sctp_make_asconf(asoc
, addr
, len
);
2877 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2878 param
.param_hdr
.length
= htons(len
);
2881 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2882 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2887 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2889 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2890 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2891 * | Type = 0x80 | Chunk Flags | Chunk Length |
2892 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2894 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2895 * | ASCONF Parameter Response#1 |
2896 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2900 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2901 * | ASCONF Parameter Response#N |
2902 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2904 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2906 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2907 __u32 serial
, int vparam_len
)
2909 sctp_addiphdr_t asconf
;
2910 struct sctp_chunk
*retval
;
2911 int length
= sizeof(asconf
) + vparam_len
;
2913 /* Create the chunk. */
2914 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
);
2918 asconf
.serial
= htonl(serial
);
2920 retval
->subh
.addip_hdr
=
2921 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2926 /* Add response parameters to an ASCONF_ACK chunk. */
2927 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2928 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2930 sctp_addip_param_t ack_param
;
2931 sctp_errhdr_t err_param
;
2932 int asconf_param_len
= 0;
2933 int err_param_len
= 0;
2934 __be16 response_type
;
2936 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2937 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2939 response_type
= SCTP_PARAM_ERR_CAUSE
;
2940 err_param_len
= sizeof(err_param
);
2943 ntohs(asconf_param
->param_hdr
.length
);
2946 /* Add Success Indication or Error Cause Indication parameter. */
2947 ack_param
.param_hdr
.type
= response_type
;
2948 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2951 ack_param
.crr_id
= crr_id
;
2952 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2954 if (SCTP_ERROR_NO_ERROR
== err_code
)
2957 /* Add Error Cause parameter. */
2958 err_param
.cause
= err_code
;
2959 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2960 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2962 /* Add the failed TLV copied from ASCONF chunk. */
2964 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
2967 /* Process a asconf parameter. */
2968 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
2969 struct sctp_chunk
*asconf
,
2970 sctp_addip_param_t
*asconf_param
)
2972 struct sctp_transport
*peer
;
2974 union sctp_addr addr
;
2975 union sctp_addr_param
*addr_param
;
2977 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
2979 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
2980 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
2981 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
2982 return SCTP_ERROR_UNKNOWN_PARAM
;
2984 switch (addr_param
->p
.type
) {
2985 case SCTP_PARAM_IPV6_ADDRESS
:
2986 if (!asoc
->peer
.ipv6_address
)
2987 return SCTP_ERROR_DNS_FAILED
;
2989 case SCTP_PARAM_IPV4_ADDRESS
:
2990 if (!asoc
->peer
.ipv4_address
)
2991 return SCTP_ERROR_DNS_FAILED
;
2994 return SCTP_ERROR_DNS_FAILED
;
2997 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
2999 return SCTP_ERROR_DNS_FAILED
;
3001 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
3003 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3004 * or multicast address.
3005 * (note: wildcard is permitted and requires special handling so
3006 * make sure we check for that)
3008 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
3009 return SCTP_ERROR_DNS_FAILED
;
3011 switch (asconf_param
->param_hdr
.type
) {
3012 case SCTP_PARAM_ADD_IP
:
3014 * If the address 0.0.0.0 or ::0 is provided, the source
3015 * address of the packet MUST be added.
3017 if (af
->is_any(&addr
))
3018 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
3020 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3021 * request and does not have the local resources to add this
3022 * new address to the association, it MUST return an Error
3023 * Cause TLV set to the new error code 'Operation Refused
3024 * Due to Resource Shortage'.
3027 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
3029 return SCTP_ERROR_RSRC_LOW
;
3031 /* Start the heartbeat timer. */
3032 if (!mod_timer(&peer
->hb_timer
, sctp_transport_timeout(peer
)))
3033 sctp_transport_hold(peer
);
3034 asoc
->new_transport
= peer
;
3036 case SCTP_PARAM_DEL_IP
:
3037 /* ADDIP 4.3 D7) If a request is received to delete the
3038 * last remaining IP address of a peer endpoint, the receiver
3039 * MUST send an Error Cause TLV with the error cause set to the
3040 * new error code 'Request to Delete Last Remaining IP Address'.
3042 if (asoc
->peer
.transport_count
== 1)
3043 return SCTP_ERROR_DEL_LAST_IP
;
3045 /* ADDIP 4.3 D8) If a request is received to delete an IP
3046 * address which is also the source address of the IP packet
3047 * which contained the ASCONF chunk, the receiver MUST reject
3048 * this request. To reject the request the receiver MUST send
3049 * an Error Cause TLV set to the new error code 'Request to
3050 * Delete Source IP Address'
3052 if (sctp_cmp_addr_exact(&asconf
->source
, &addr
))
3053 return SCTP_ERROR_DEL_SRC_IP
;
3056 * If the address 0.0.0.0 or ::0 is provided, all
3057 * addresses of the peer except the source address of the
3058 * packet MUST be deleted.
3060 if (af
->is_any(&addr
)) {
3061 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3062 sctp_assoc_del_nonprimary_peers(asoc
,
3065 sctp_assoc_del_peer(asoc
, &addr
);
3067 case SCTP_PARAM_SET_PRIMARY
:
3068 /* ADDIP Section 4.2.4
3069 * If the address 0.0.0.0 or ::0 is provided, the receiver
3070 * MAY mark the source address of the packet as its
3073 if (af
->is_any(&addr
))
3074 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3076 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3078 return SCTP_ERROR_DNS_FAILED
;
3080 sctp_assoc_set_primary(asoc
, peer
);
3084 return SCTP_ERROR_NO_ERROR
;
3087 /* Verify the ASCONF packet before we process it. */
3088 int sctp_verify_asconf(const struct sctp_association
*asoc
,
3089 struct sctp_paramhdr
*param_hdr
, void *chunk_end
,
3090 struct sctp_paramhdr
**errp
) {
3091 sctp_addip_param_t
*asconf_param
;
3092 union sctp_params param
;
3095 param
.v
= (sctp_paramhdr_t
*) param_hdr
;
3096 while (param
.v
<= chunk_end
- sizeof(sctp_paramhdr_t
)) {
3097 length
= ntohs(param
.p
->length
);
3100 if (param
.v
> chunk_end
- length
||
3101 length
< sizeof(sctp_paramhdr_t
))
3104 switch (param
.p
->type
) {
3105 case SCTP_PARAM_ADD_IP
:
3106 case SCTP_PARAM_DEL_IP
:
3107 case SCTP_PARAM_SET_PRIMARY
:
3108 asconf_param
= (sctp_addip_param_t
*)param
.v
;
3109 plen
= ntohs(asconf_param
->param_hdr
.length
);
3110 if (plen
< sizeof(sctp_addip_param_t
) +
3111 sizeof(sctp_paramhdr_t
))
3114 case SCTP_PARAM_SUCCESS_REPORT
:
3115 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3116 if (length
!= sizeof(sctp_addip_param_t
))
3124 param
.v
+= WORD_ROUND(length
);
3127 if (param
.v
!= chunk_end
)
3133 /* Process an incoming ASCONF chunk with the next expected serial no. and
3134 * return an ASCONF_ACK chunk to be sent in response.
3136 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3137 struct sctp_chunk
*asconf
)
3139 sctp_addiphdr_t
*hdr
;
3140 union sctp_addr_param
*addr_param
;
3141 sctp_addip_param_t
*asconf_param
;
3142 struct sctp_chunk
*asconf_ack
;
3148 int all_param_pass
= 1;
3150 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) - sizeof(sctp_chunkhdr_t
);
3151 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
3152 serial
= ntohl(hdr
->serial
);
3154 /* Skip the addiphdr and store a pointer to address parameter. */
3155 length
= sizeof(sctp_addiphdr_t
);
3156 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3157 chunk_len
-= length
;
3159 /* Skip the address parameter and store a pointer to the first
3162 length
= ntohs(addr_param
->p
.length
);
3163 asconf_param
= (void *)addr_param
+ length
;
3164 chunk_len
-= length
;
3166 /* create an ASCONF_ACK chunk.
3167 * Based on the definitions of parameters, we know that the size of
3168 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3171 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 4);
3175 /* Process the TLVs contained within the ASCONF chunk. */
3176 while (chunk_len
> 0) {
3177 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3180 * If an error response is received for a TLV parameter,
3181 * all TLVs with no response before the failed TLV are
3182 * considered successful if not reported. All TLVs after
3183 * the failed response are considered unsuccessful unless
3184 * a specific success indication is present for the parameter.
3186 if (SCTP_ERROR_NO_ERROR
!= err_code
)
3189 if (!all_param_pass
)
3190 sctp_add_asconf_response(asconf_ack
,
3191 asconf_param
->crr_id
, err_code
,
3194 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3195 * an IP address sends an 'Out of Resource' in its response, it
3196 * MUST also fail any subsequent add or delete requests bundled
3199 if (SCTP_ERROR_RSRC_LOW
== err_code
)
3202 /* Move to the next ASCONF param. */
3203 length
= ntohs(asconf_param
->param_hdr
.length
);
3204 asconf_param
= (void *)asconf_param
+ length
;
3205 chunk_len
-= length
;
3209 asoc
->peer
.addip_serial
++;
3211 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3212 * after freeing the reference to old asconf ack if any.
3215 sctp_chunk_hold(asconf_ack
);
3216 list_add_tail(&asconf_ack
->transmitted_list
,
3217 &asoc
->asconf_ack_list
);
3223 /* Process a asconf parameter that is successfully acked. */
3224 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3225 sctp_addip_param_t
*asconf_param
)
3228 union sctp_addr addr
;
3229 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3230 union sctp_addr_param
*addr_param
;
3231 struct sctp_transport
*transport
;
3232 struct sctp_sockaddr_entry
*saddr
;
3234 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3236 /* We have checked the packet before, so we do not check again. */
3237 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3238 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3240 switch (asconf_param
->param_hdr
.type
) {
3241 case SCTP_PARAM_ADD_IP
:
3242 /* This is always done in BH context with a socket lock
3243 * held, so the list can not change.
3246 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3247 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3248 saddr
->state
= SCTP_ADDR_SRC
;
3251 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3253 dst_release(transport
->dst
);
3254 transport
->dst
= NULL
;
3257 case SCTP_PARAM_DEL_IP
:
3259 sctp_del_bind_addr(bp
, &addr
);
3260 if (asoc
->asconf_addr_del_pending
!= NULL
&&
3261 sctp_cmp_addr_exact(asoc
->asconf_addr_del_pending
, &addr
)) {
3262 kfree(asoc
->asconf_addr_del_pending
);
3263 asoc
->asconf_addr_del_pending
= NULL
;
3266 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3268 dst_release(transport
->dst
);
3269 transport
->dst
= NULL
;
3277 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3278 * for the given asconf parameter. If there is no response for this parameter,
3279 * return the error code based on the third argument 'no_err'.
3281 * A7) If an error response is received for a TLV parameter, all TLVs with no
3282 * response before the failed TLV are considered successful if not reported.
3283 * All TLVs after the failed response are considered unsuccessful unless a
3284 * specific success indication is present for the parameter.
3286 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3287 sctp_addip_param_t
*asconf_param
,
3290 sctp_addip_param_t
*asconf_ack_param
;
3291 sctp_errhdr_t
*err_param
;
3297 err_code
= SCTP_ERROR_NO_ERROR
;
3299 err_code
= SCTP_ERROR_REQ_REFUSED
;
3301 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3302 sizeof(sctp_chunkhdr_t
);
3304 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3305 * the first asconf_ack parameter.
3307 length
= sizeof(sctp_addiphdr_t
);
3308 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
3310 asconf_ack_len
-= length
;
3312 while (asconf_ack_len
> 0) {
3313 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3314 switch(asconf_ack_param
->param_hdr
.type
) {
3315 case SCTP_PARAM_SUCCESS_REPORT
:
3316 return SCTP_ERROR_NO_ERROR
;
3317 case SCTP_PARAM_ERR_CAUSE
:
3318 length
= sizeof(sctp_addip_param_t
);
3319 err_param
= (void *)asconf_ack_param
+ length
;
3320 asconf_ack_len
-= length
;
3321 if (asconf_ack_len
> 0)
3322 return err_param
->cause
;
3324 return SCTP_ERROR_INV_PARAM
;
3327 return SCTP_ERROR_INV_PARAM
;
3331 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3332 asconf_ack_param
= (void *)asconf_ack_param
+ length
;
3333 asconf_ack_len
-= length
;
3339 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3340 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3341 struct sctp_chunk
*asconf_ack
)
3343 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3344 union sctp_addr_param
*addr_param
;
3345 sctp_addip_param_t
*asconf_param
;
3347 int asconf_len
= asconf
->skb
->len
;
3348 int all_param_pass
= 0;
3351 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3353 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3354 * a pointer to address parameter.
3356 length
= sizeof(sctp_addip_chunk_t
);
3357 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3358 asconf_len
-= length
;
3360 /* Skip the address parameter in the last asconf sent and store a
3361 * pointer to the first asconf parameter.
3363 length
= ntohs(addr_param
->p
.length
);
3364 asconf_param
= (void *)addr_param
+ length
;
3365 asconf_len
-= length
;
3368 * A8) If there is no response(s) to specific TLV parameter(s), and no
3369 * failures are indicated, then all request(s) are considered
3372 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
3375 /* Process the TLVs contained in the last sent ASCONF chunk. */
3376 while (asconf_len
> 0) {
3378 err_code
= SCTP_ERROR_NO_ERROR
;
3380 err_code
= sctp_get_asconf_response(asconf_ack
,
3383 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3388 case SCTP_ERROR_NO_ERROR
:
3389 sctp_asconf_param_success(asoc
, asconf_param
);
3392 case SCTP_ERROR_RSRC_LOW
:
3396 case SCTP_ERROR_UNKNOWN_PARAM
:
3397 /* Disable sending this type of asconf parameter in
3400 asoc
->peer
.addip_disabled_mask
|=
3401 asconf_param
->param_hdr
.type
;
3404 case SCTP_ERROR_REQ_REFUSED
:
3405 case SCTP_ERROR_DEL_LAST_IP
:
3406 case SCTP_ERROR_DEL_SRC_IP
:
3411 /* Skip the processed asconf parameter and move to the next
3414 length
= ntohs(asconf_param
->param_hdr
.length
);
3415 asconf_param
= (void *)asconf_param
+ length
;
3416 asconf_len
-= length
;
3419 if (no_err
&& asoc
->src_out_of_asoc_ok
) {
3420 asoc
->src_out_of_asoc_ok
= 0;
3421 sctp_transport_immediate_rtx(asoc
->peer
.primary_path
);
3424 /* Free the cached last sent asconf chunk. */
3425 list_del_init(&asconf
->transmitted_list
);
3426 sctp_chunk_free(asconf
);
3427 asoc
->addip_last_asconf
= NULL
;
3432 /* Make a FWD TSN chunk. */
3433 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3434 __u32 new_cum_tsn
, size_t nstreams
,
3435 struct sctp_fwdtsn_skip
*skiplist
)
3437 struct sctp_chunk
*retval
= NULL
;
3438 struct sctp_fwdtsn_hdr ftsn_hdr
;
3439 struct sctp_fwdtsn_skip skip
;
3443 hint
= (nstreams
+ 1) * sizeof(__u32
);
3445 retval
= sctp_make_chunk(asoc
, SCTP_CID_FWD_TSN
, 0, hint
);
3450 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3451 retval
->subh
.fwdtsn_hdr
=
3452 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3454 for (i
= 0; i
< nstreams
; i
++) {
3455 skip
.stream
= skiplist
[i
].stream
;
3456 skip
.ssn
= skiplist
[i
].ssn
;
3457 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);