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 static 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
)
201 struct net
*net
= sock_net(asoc
->base
.sk
);
203 union sctp_params addrs
;
205 struct sctp_chunk
*retval
= NULL
;
206 int num_types
, addrs_len
= 0;
207 struct sctp_sock
*sp
;
208 sctp_supported_addrs_param_t sat
;
210 sctp_adaptation_ind_param_t aiparam
;
211 sctp_supported_ext_param_t ext_param
;
214 sctp_paramhdr_t
*auth_chunks
= NULL
,
217 /* RFC 2960 3.3.2 Initiation (INIT) (1)
219 * Note 1: The INIT chunks can contain multiple addresses that
220 * can be IPv4 and/or IPv6 in any combination.
224 /* Convert the provided bind address list to raw format. */
225 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
227 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
228 init
.a_rwnd
= htonl(asoc
->rwnd
);
229 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
230 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
231 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
233 /* How many address types are needed? */
234 sp
= sctp_sk(asoc
->base
.sk
);
235 num_types
= sp
->pf
->supported_addrs(sp
, types
);
237 chunksize
= sizeof(init
) + addrs_len
;
238 chunksize
+= WORD_ROUND(SCTP_SAT_LEN(num_types
));
239 chunksize
+= sizeof(ecap_param
);
241 if (net
->sctp
.prsctp_enable
)
242 chunksize
+= sizeof(prsctp_param
);
244 /* ADDIP: Section 4.2.7:
245 * An implementation supporting this extension [ADDIP] MUST list
246 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
247 * INIT-ACK parameters.
249 if (net
->sctp
.addip_enable
) {
250 extensions
[num_ext
] = SCTP_CID_ASCONF
;
251 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
255 if (sp
->adaptation_ind
)
256 chunksize
+= sizeof(aiparam
);
258 chunksize
+= vparam_len
;
260 /* Account for AUTH related parameters */
261 if (net
->sctp
.auth_enable
) {
262 /* Add random parameter length*/
263 chunksize
+= sizeof(asoc
->c
.auth_random
);
265 /* Add HMACS parameter length if any were defined */
266 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
267 if (auth_hmacs
->length
)
268 chunksize
+= WORD_ROUND(ntohs(auth_hmacs
->length
));
272 /* Add CHUNKS parameter length */
273 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
274 if (auth_chunks
->length
)
275 chunksize
+= WORD_ROUND(ntohs(auth_chunks
->length
));
279 extensions
[num_ext
] = SCTP_CID_AUTH
;
283 /* If we have any extensions to report, account for that */
285 chunksize
+= WORD_ROUND(sizeof(sctp_supported_ext_param_t
) +
288 /* RFC 2960 3.3.2 Initiation (INIT) (1)
290 * Note 3: An INIT chunk MUST NOT contain more than one Host
291 * Name address parameter. Moreover, the sender of the INIT
292 * MUST NOT combine any other address types with the Host Name
293 * address in the INIT. The receiver of INIT MUST ignore any
294 * other address types if the Host Name address parameter is
295 * present in the received INIT chunk.
297 * PLEASE DO NOT FIXME [This version does not support Host Name.]
300 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT
, 0, chunksize
);
304 retval
->subh
.init_hdr
=
305 sctp_addto_chunk(retval
, sizeof(init
), &init
);
306 retval
->param_hdr
.v
=
307 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
309 /* RFC 2960 3.3.2 Initiation (INIT) (1)
311 * Note 4: This parameter, when present, specifies all the
312 * address types the sending endpoint can support. The absence
313 * of this parameter indicates that the sending endpoint can
314 * support any address type.
316 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
317 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
318 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
319 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
321 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
323 /* Add the supported extensions parameter. Be nice and add this
324 * fist before addiding the parameters for the extensions themselves
327 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
328 ext_param
.param_hdr
.length
=
329 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
330 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
332 sctp_addto_param(retval
, num_ext
, extensions
);
335 if (net
->sctp
.prsctp_enable
)
336 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
338 if (sp
->adaptation_ind
) {
339 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
340 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
341 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
342 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
345 /* Add SCTP-AUTH chunks to the parameter list */
346 if (net
->sctp
.auth_enable
) {
347 sctp_addto_chunk(retval
, sizeof(asoc
->c
.auth_random
),
348 asoc
->c
.auth_random
);
350 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
353 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
361 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
362 const struct sctp_chunk
*chunk
,
363 gfp_t gfp
, int unkparam_len
)
365 sctp_inithdr_t initack
;
366 struct sctp_chunk
*retval
;
367 union sctp_params addrs
;
368 struct sctp_sock
*sp
;
370 sctp_cookie_param_t
*cookie
;
373 sctp_adaptation_ind_param_t aiparam
;
374 sctp_supported_ext_param_t ext_param
;
377 sctp_paramhdr_t
*auth_chunks
= NULL
,
383 /* Note: there may be no addresses to embed. */
384 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
386 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
387 initack
.a_rwnd
= htonl(asoc
->rwnd
);
388 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
389 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
390 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
392 /* FIXME: We really ought to build the cookie right
393 * into the packet instead of allocating more fresh memory.
395 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
400 /* Calculate the total size of allocation, include the reserved
401 * space for reporting unknown parameters if it is specified.
403 sp
= sctp_sk(asoc
->base
.sk
);
404 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
406 /* Tell peer that we'll do ECN only if peer advertised such cap. */
407 if (asoc
->peer
.ecn_capable
)
408 chunksize
+= sizeof(ecap_param
);
410 if (asoc
->peer
.prsctp_capable
)
411 chunksize
+= sizeof(prsctp_param
);
413 if (asoc
->peer
.asconf_capable
) {
414 extensions
[num_ext
] = SCTP_CID_ASCONF
;
415 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
419 if (sp
->adaptation_ind
)
420 chunksize
+= sizeof(aiparam
);
422 if (asoc
->peer
.auth_capable
) {
423 auth_random
= (sctp_paramhdr_t
*)asoc
->c
.auth_random
;
424 chunksize
+= ntohs(auth_random
->length
);
426 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
427 if (auth_hmacs
->length
)
428 chunksize
+= WORD_ROUND(ntohs(auth_hmacs
->length
));
432 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
433 if (auth_chunks
->length
)
434 chunksize
+= WORD_ROUND(ntohs(auth_chunks
->length
));
438 extensions
[num_ext
] = SCTP_CID_AUTH
;
443 chunksize
+= WORD_ROUND(sizeof(sctp_supported_ext_param_t
) +
446 /* Now allocate and fill out the chunk. */
447 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
);
451 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
453 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
454 * HEARTBEAT ACK, * etc.) to the same destination transport
455 * address from which it received the DATA or control chunk
456 * to which it is replying.
458 * [INIT ACK back to where the INIT came from.]
460 retval
->transport
= chunk
->transport
;
462 retval
->subh
.init_hdr
=
463 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
464 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
465 sctp_addto_chunk(retval
, cookie_len
, cookie
);
466 if (asoc
->peer
.ecn_capable
)
467 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
469 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
470 ext_param
.param_hdr
.length
=
471 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
472 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
474 sctp_addto_param(retval
, num_ext
, extensions
);
476 if (asoc
->peer
.prsctp_capable
)
477 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
479 if (sp
->adaptation_ind
) {
480 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
481 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
482 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
483 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
486 if (asoc
->peer
.auth_capable
) {
487 sctp_addto_chunk(retval
, ntohs(auth_random
->length
),
490 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
493 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
497 /* We need to remove the const qualifier at this point. */
498 retval
->asoc
= (struct sctp_association
*) asoc
;
507 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
509 * This chunk is used only during the initialization of an association.
510 * It is sent by the initiator of an association to its peer to complete
511 * the initialization process. This chunk MUST precede any DATA chunk
512 * sent within the association, but MAY be bundled with one or more DATA
513 * chunks in the same packet.
516 * 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
517 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
518 * | Type = 10 |Chunk Flags | Length |
519 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
522 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
526 * Set to zero on transmit and ignored on receipt.
528 * Length: 16 bits (unsigned integer)
530 * Set to the size of the chunk in bytes, including the 4 bytes of
531 * the chunk header and the size of the Cookie.
533 * Cookie: variable size
535 * This field must contain the exact cookie received in the
536 * State Cookie parameter from the previous INIT ACK.
538 * An implementation SHOULD make the cookie as small as possible
539 * to insure interoperability.
541 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
542 const struct sctp_chunk
*chunk
)
544 struct sctp_chunk
*retval
;
548 cookie
= asoc
->peer
.cookie
;
549 cookie_len
= asoc
->peer
.cookie_len
;
551 /* Build a cookie echo chunk. */
552 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ECHO
, 0, cookie_len
);
555 retval
->subh
.cookie_hdr
=
556 sctp_addto_chunk(retval
, cookie_len
, cookie
);
558 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
560 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
561 * HEARTBEAT ACK, * etc.) to the same destination transport
562 * address from which it * received the DATA or control chunk
563 * to which it is replying.
565 * [COOKIE ECHO back to where the INIT ACK came from.]
568 retval
->transport
= chunk
->transport
;
574 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
576 * This chunk is used only during the initialization of an
577 * association. It is used to acknowledge the receipt of a COOKIE
578 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
579 * within the association, but MAY be bundled with one or more DATA
580 * chunks or SACK chunk in the same SCTP packet.
583 * 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
584 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
585 * | Type = 11 |Chunk Flags | Length = 4 |
586 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
588 * Chunk Flags: 8 bits
590 * Set to zero on transmit and ignored on receipt.
592 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
593 const struct sctp_chunk
*chunk
)
595 struct sctp_chunk
*retval
;
597 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0);
599 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
601 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
602 * HEARTBEAT ACK, * etc.) to the same destination transport
603 * address from which it * received the DATA or control chunk
604 * to which it is replying.
606 * [COOKIE ACK back to where the COOKIE ECHO came from.]
609 retval
->transport
= chunk
->transport
;
615 * Appendix A: Explicit Congestion Notification:
618 * RFC 2481 details a specific bit for a sender to send in the header of
619 * its next outbound TCP segment to indicate to its peer that it has
620 * reduced its congestion window. This is termed the CWR bit. For
621 * SCTP the same indication is made by including the CWR chunk.
622 * This chunk contains one data element, i.e. the TSN number that
623 * was sent in the ECNE chunk. This element represents the lowest
624 * TSN number in the datagram that was originally marked with the
628 * 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
629 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
630 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
631 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
632 * | Lowest TSN Number |
633 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
635 * Note: The CWR is considered a Control chunk.
637 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
638 const __u32 lowest_tsn
,
639 const struct sctp_chunk
*chunk
)
641 struct sctp_chunk
*retval
;
644 cwr
.lowest_tsn
= htonl(lowest_tsn
);
645 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_CWR
, 0,
646 sizeof(sctp_cwrhdr_t
));
651 retval
->subh
.ecn_cwr_hdr
=
652 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
654 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
656 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
657 * HEARTBEAT ACK, * etc.) to the same destination transport
658 * address from which it * received the DATA or control chunk
659 * to which it is replying.
661 * [Report a reduced congestion window back to where the ECNE
665 retval
->transport
= chunk
->transport
;
671 /* Make an ECNE chunk. This is a congestion experienced report. */
672 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
673 const __u32 lowest_tsn
)
675 struct sctp_chunk
*retval
;
678 ecne
.lowest_tsn
= htonl(lowest_tsn
);
679 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_ECNE
, 0,
680 sizeof(sctp_ecnehdr_t
));
683 retval
->subh
.ecne_hdr
=
684 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
690 /* Make a DATA chunk for the given association from the provided
691 * parameters. However, do not populate the data payload.
693 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
694 const struct sctp_sndrcvinfo
*sinfo
,
695 int data_len
, __u8 flags
, __u16 ssn
)
697 struct sctp_chunk
*retval
;
698 struct sctp_datahdr dp
;
701 /* We assign the TSN as LATE as possible, not here when
702 * creating the chunk.
705 dp
.stream
= htons(sinfo
->sinfo_stream
);
706 dp
.ppid
= sinfo
->sinfo_ppid
;
708 /* Set the flags for an unordered send. */
709 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
710 flags
|= SCTP_DATA_UNORDERED
;
715 chunk_len
= sizeof(dp
) + data_len
;
716 retval
= sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, chunk_len
);
720 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
721 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
727 /* Create a selective ackowledgement (SACK) for the given
728 * association. This reports on which TSN's we've seen to date,
729 * including duplicates and gaps.
731 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
733 struct sctp_chunk
*retval
;
734 struct sctp_sackhdr sack
;
737 __u16 num_gabs
, num_dup_tsns
;
738 struct sctp_association
*aptr
= (struct sctp_association
*)asoc
;
739 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
740 struct sctp_gap_ack_block gabs
[SCTP_MAX_GABS
];
741 struct sctp_transport
*trans
;
743 memset(gabs
, 0, sizeof(gabs
));
744 ctsn
= sctp_tsnmap_get_ctsn(map
);
745 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn
);
747 /* How much room is needed in the chunk? */
748 num_gabs
= sctp_tsnmap_num_gabs(map
, gabs
);
749 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
751 /* Initialize the SACK header. */
752 sack
.cum_tsn_ack
= htonl(ctsn
);
753 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
754 sack
.num_gap_ack_blocks
= htons(num_gabs
);
755 sack
.num_dup_tsns
= htons(num_dup_tsns
);
758 + sizeof(struct sctp_gap_ack_block
) * num_gabs
759 + sizeof(__u32
) * num_dup_tsns
;
761 /* Create the chunk. */
762 retval
= sctp_make_chunk(asoc
, SCTP_CID_SACK
, 0, len
);
766 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
768 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
769 * HEARTBEAT ACK, etc.) to the same destination transport
770 * address from which it received the DATA or control chunk to
771 * which it is replying. This rule should also be followed if
772 * the endpoint is bundling DATA chunks together with the
775 * However, when acknowledging multiple DATA chunks received
776 * in packets from different source addresses in a single
777 * SACK, the SACK chunk may be transmitted to one of the
778 * destination transport addresses from which the DATA or
779 * control chunks being acknowledged were received.
781 * [BUG: We do not implement the following paragraph.
782 * Perhaps we should remember the last transport we used for a
783 * SACK and avoid that (if possible) if we have seen any
784 * duplicates. --piggy]
786 * When a receiver of a duplicate DATA chunk sends a SACK to a
787 * multi- homed endpoint it MAY be beneficial to vary the
788 * destination address and not use the source address of the
789 * DATA chunk. The reason being that receiving a duplicate
790 * from a multi-homed endpoint might indicate that the return
791 * path (as specified in the source address of the DATA chunk)
792 * for the SACK is broken.
794 * [Send to the address from which we last received a DATA chunk.]
796 retval
->transport
= asoc
->peer
.last_data_from
;
798 retval
->subh
.sack_hdr
=
799 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
801 /* Add the gap ack block information. */
803 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
806 /* Add the duplicate TSN information. */
808 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
809 sctp_tsnmap_get_dups(map
));
811 /* Once we have a sack generated, check to see what our sack
812 * generation is, if its 0, reset the transports to 0, and reset
813 * the association generation to 1
815 * The idea is that zero is never used as a valid generation for the
816 * association so no transport will match after a wrap event like this,
817 * Until the next sack
819 if (++aptr
->peer
.sack_generation
== 0) {
820 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
822 trans
->sack_generation
= 0;
823 aptr
->peer
.sack_generation
= 1;
829 /* Make a SHUTDOWN chunk. */
830 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
831 const struct sctp_chunk
*chunk
)
833 struct sctp_chunk
*retval
;
834 sctp_shutdownhdr_t shut
;
837 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
838 shut
.cum_tsn_ack
= htonl(ctsn
);
840 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN
, 0,
841 sizeof(sctp_shutdownhdr_t
));
845 retval
->subh
.shutdown_hdr
=
846 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
849 retval
->transport
= chunk
->transport
;
854 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
855 const struct sctp_chunk
*chunk
)
857 struct sctp_chunk
*retval
;
859 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0);
861 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
863 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
864 * HEARTBEAT ACK, * etc.) to the same destination transport
865 * address from which it * received the DATA or control chunk
866 * to which it is replying.
868 * [ACK back to where the SHUTDOWN came from.]
871 retval
->transport
= chunk
->transport
;
876 struct sctp_chunk
*sctp_make_shutdown_complete(
877 const struct sctp_association
*asoc
,
878 const struct sctp_chunk
*chunk
)
880 struct sctp_chunk
*retval
;
883 /* Set the T-bit if we have no association (vtag will be
886 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
888 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
, 0);
890 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
892 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
893 * HEARTBEAT ACK, * etc.) to the same destination transport
894 * address from which it * received the DATA or control chunk
895 * to which it is replying.
897 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
901 retval
->transport
= chunk
->transport
;
906 /* Create an ABORT. Note that we set the T bit if we have no
907 * association, except when responding to an INIT (sctpimpguide 2.41).
909 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
910 const struct sctp_chunk
*chunk
,
913 struct sctp_chunk
*retval
;
916 /* Set the T-bit if we have no association and 'chunk' is not
917 * an INIT (vtag will be reflected).
920 if (chunk
&& chunk
->chunk_hdr
&&
921 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
924 flags
= SCTP_CHUNK_FLAG_T
;
927 retval
= sctp_make_chunk(asoc
, SCTP_CID_ABORT
, flags
, hint
);
929 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
931 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
932 * HEARTBEAT ACK, * etc.) to the same destination transport
933 * address from which it * received the DATA or control chunk
934 * to which it is replying.
936 * [ABORT back to where the offender came from.]
939 retval
->transport
= chunk
->transport
;
944 /* Helper to create ABORT with a NO_USER_DATA error. */
945 struct sctp_chunk
*sctp_make_abort_no_data(
946 const struct sctp_association
*asoc
,
947 const struct sctp_chunk
*chunk
, __u32 tsn
)
949 struct sctp_chunk
*retval
;
952 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
958 /* Put the tsn back into network byte order. */
959 payload
= htonl(tsn
);
960 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
961 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
963 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
965 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
966 * HEARTBEAT ACK, * etc.) to the same destination transport
967 * address from which it * received the DATA or control chunk
968 * to which it is replying.
970 * [ABORT back to where the offender came from.]
973 retval
->transport
= chunk
->transport
;
979 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
980 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
981 const struct msghdr
*msg
,
984 struct sctp_chunk
*retval
;
985 void *payload
= NULL
;
988 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
993 /* Put the msg_iov together into payload. */
994 payload
= kmalloc(paylen
, GFP_KERNEL
);
998 err
= memcpy_fromiovec(payload
, msg
->msg_iov
, paylen
);
1003 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
1004 sctp_addto_chunk(retval
, paylen
, payload
);
1014 sctp_chunk_free(retval
);
1020 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1023 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
1027 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1029 target
= skb_put(chunk
->skb
, len
);
1032 memcpy(target
, data
, len
);
1034 memset(target
, 0, len
);
1036 /* Adjust the chunk length field. */
1037 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
1038 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1043 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1044 struct sctp_chunk
*sctp_make_abort_violation(
1045 const struct sctp_association
*asoc
,
1046 const struct sctp_chunk
*chunk
,
1047 const __u8
*payload
,
1048 const size_t paylen
)
1050 struct sctp_chunk
*retval
;
1051 struct sctp_paramhdr phdr
;
1053 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
1054 + sizeof(sctp_paramhdr_t
));
1058 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
1059 + sizeof(sctp_paramhdr_t
));
1061 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
1062 phdr
.length
= chunk
->chunk_hdr
->length
;
1063 sctp_addto_chunk(retval
, paylen
, payload
);
1064 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
1070 struct sctp_chunk
*sctp_make_violation_paramlen(
1071 const struct sctp_association
*asoc
,
1072 const struct sctp_chunk
*chunk
,
1073 struct sctp_paramhdr
*param
)
1075 struct sctp_chunk
*retval
;
1076 static const char error
[] = "The following parameter had invalid length:";
1077 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
) +
1078 sizeof(sctp_paramhdr_t
);
1080 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1084 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
,
1085 sizeof(error
) + sizeof(sctp_paramhdr_t
));
1086 sctp_addto_chunk(retval
, sizeof(error
), error
);
1087 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), param
);
1093 struct sctp_chunk
*sctp_make_violation_max_retrans(
1094 const struct sctp_association
*asoc
,
1095 const struct sctp_chunk
*chunk
)
1097 struct sctp_chunk
*retval
;
1098 static const char error
[] = "Association exceeded its max_retans count";
1099 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
);
1101 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1105 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, sizeof(error
));
1106 sctp_addto_chunk(retval
, sizeof(error
), error
);
1112 /* Make a HEARTBEAT chunk. */
1113 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
1114 const struct sctp_transport
*transport
)
1116 struct sctp_chunk
*retval
;
1117 sctp_sender_hb_info_t hbinfo
;
1119 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT
, 0, sizeof(hbinfo
));
1124 hbinfo
.param_hdr
.type
= SCTP_PARAM_HEARTBEAT_INFO
;
1125 hbinfo
.param_hdr
.length
= htons(sizeof(sctp_sender_hb_info_t
));
1126 hbinfo
.daddr
= transport
->ipaddr
;
1127 hbinfo
.sent_at
= jiffies
;
1128 hbinfo
.hb_nonce
= transport
->hb_nonce
;
1130 /* Cast away the 'const', as this is just telling the chunk
1131 * what transport it belongs to.
1133 retval
->transport
= (struct sctp_transport
*) transport
;
1134 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, sizeof(hbinfo
),
1141 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
1142 const struct sctp_chunk
*chunk
,
1143 const void *payload
, const size_t paylen
)
1145 struct sctp_chunk
*retval
;
1147 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
);
1151 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1153 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1155 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1156 * HEARTBEAT ACK, * etc.) to the same destination transport
1157 * address from which it * received the DATA or control chunk
1158 * to which it is replying.
1160 * [HBACK back to where the HEARTBEAT came from.]
1163 retval
->transport
= chunk
->transport
;
1169 /* Create an Operation Error chunk with the specified space reserved.
1170 * This routine can be used for containing multiple causes in the chunk.
1172 static struct sctp_chunk
*sctp_make_op_error_space(
1173 const struct sctp_association
*asoc
,
1174 const struct sctp_chunk
*chunk
,
1177 struct sctp_chunk
*retval
;
1179 retval
= sctp_make_chunk(asoc
, SCTP_CID_ERROR
, 0,
1180 sizeof(sctp_errhdr_t
) + size
);
1184 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1186 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1187 * HEARTBEAT ACK, etc.) to the same destination transport
1188 * address from which it received the DATA or control chunk
1189 * to which it is replying.
1193 retval
->transport
= chunk
->transport
;
1199 /* Create an Operation Error chunk of a fixed size,
1200 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1201 * This is a helper function to allocate an error chunk for
1202 * for those invalid parameter codes in which we may not want
1203 * to report all the errors, if the incomming chunk is large
1205 static inline struct sctp_chunk
*sctp_make_op_error_fixed(
1206 const struct sctp_association
*asoc
,
1207 const struct sctp_chunk
*chunk
)
1209 size_t size
= asoc
? asoc
->pathmtu
: 0;
1212 size
= SCTP_DEFAULT_MAXSEGMENT
;
1214 return sctp_make_op_error_space(asoc
, chunk
, size
);
1217 /* Create an Operation Error chunk. */
1218 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1219 const struct sctp_chunk
*chunk
,
1220 __be16 cause_code
, const void *payload
,
1221 size_t paylen
, size_t reserve_tail
)
1223 struct sctp_chunk
*retval
;
1225 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
+ reserve_tail
);
1229 sctp_init_cause(retval
, cause_code
, paylen
+ reserve_tail
);
1230 sctp_addto_chunk(retval
, paylen
, payload
);
1232 sctp_addto_param(retval
, reserve_tail
, NULL
);
1238 struct sctp_chunk
*sctp_make_auth(const struct sctp_association
*asoc
)
1240 struct sctp_chunk
*retval
;
1241 struct sctp_hmac
*hmac_desc
;
1242 struct sctp_authhdr auth_hdr
;
1245 /* Get the first hmac that the peer told us to use */
1246 hmac_desc
= sctp_auth_asoc_get_hmac(asoc
);
1247 if (unlikely(!hmac_desc
))
1250 retval
= sctp_make_chunk(asoc
, SCTP_CID_AUTH
, 0,
1251 hmac_desc
->hmac_len
+ sizeof(sctp_authhdr_t
));
1255 auth_hdr
.hmac_id
= htons(hmac_desc
->hmac_id
);
1256 auth_hdr
.shkey_id
= htons(asoc
->active_key_id
);
1258 retval
->subh
.auth_hdr
= sctp_addto_chunk(retval
, sizeof(sctp_authhdr_t
),
1261 hmac
= skb_put(retval
->skb
, hmac_desc
->hmac_len
);
1262 memset(hmac
, 0, hmac_desc
->hmac_len
);
1264 /* Adjust the chunk header to include the empty MAC */
1265 retval
->chunk_hdr
->length
=
1266 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1267 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1273 /********************************************************************
1274 * 2nd Level Abstractions
1275 ********************************************************************/
1277 /* Turn an skb into a chunk.
1278 * FIXME: Eventually move the structure directly inside the skb->cb[].
1280 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1281 const struct sctp_association
*asoc
,
1284 struct sctp_chunk
*retval
;
1286 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, GFP_ATOMIC
);
1292 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb
);
1295 INIT_LIST_HEAD(&retval
->list
);
1297 retval
->asoc
= (struct sctp_association
*)asoc
;
1298 retval
->has_tsn
= 0;
1299 retval
->has_ssn
= 0;
1300 retval
->rtt_in_progress
= 0;
1301 retval
->sent_at
= 0;
1302 retval
->singleton
= 1;
1303 retval
->end_of_packet
= 0;
1304 retval
->ecn_ce_done
= 0;
1305 retval
->pdiscard
= 0;
1307 /* sctpimpguide-05.txt Section 2.8.2
1308 * M1) Each time a new DATA chunk is transmitted
1309 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1310 * 'TSN.Missing.Report' count will be used to determine missing chunks
1311 * and when to fast retransmit.
1313 retval
->tsn_missing_report
= 0;
1314 retval
->tsn_gap_acked
= 0;
1315 retval
->fast_retransmit
= SCTP_CAN_FRTX
;
1317 /* If this is a fragmented message, track all fragments
1318 * of the message (for SEND_FAILED).
1322 /* Polish the bead hole. */
1323 INIT_LIST_HEAD(&retval
->transmitted_list
);
1324 INIT_LIST_HEAD(&retval
->frag_list
);
1325 SCTP_DBG_OBJCNT_INC(chunk
);
1326 atomic_set(&retval
->refcnt
, 1);
1332 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1333 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1334 union sctp_addr
*dest
)
1336 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1337 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1340 /* Extract the source address from a chunk. */
1341 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1343 /* If we have a known transport, use that. */
1344 if (chunk
->transport
) {
1345 return &chunk
->transport
->ipaddr
;
1347 /* Otherwise, extract it from the IP header. */
1348 return &chunk
->source
;
1352 /* Create a new chunk, setting the type and flags headers from the
1353 * arguments, reserving enough space for a 'paylen' byte payload.
1356 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
1357 __u8 type
, __u8 flags
, int paylen
)
1359 struct sctp_chunk
*retval
;
1360 sctp_chunkhdr_t
*chunk_hdr
;
1361 struct sk_buff
*skb
;
1364 /* No need to allocate LL here, as this is only a chunk. */
1365 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
),
1370 /* Make room for the chunk header. */
1371 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1372 chunk_hdr
->type
= type
;
1373 chunk_hdr
->flags
= flags
;
1374 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1376 sk
= asoc
? asoc
->base
.sk
: NULL
;
1377 retval
= sctp_chunkify(skb
, asoc
, sk
);
1383 retval
->chunk_hdr
= chunk_hdr
;
1384 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1386 /* Determine if the chunk needs to be authenticated */
1387 if (sctp_auth_send_cid(type
, asoc
))
1390 /* Set the skb to the belonging sock for accounting. */
1399 /* Release the memory occupied by a chunk. */
1400 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1402 BUG_ON(!list_empty(&chunk
->list
));
1403 list_del_init(&chunk
->transmitted_list
);
1405 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1406 dev_kfree_skb(chunk
->skb
);
1408 SCTP_DBG_OBJCNT_DEC(chunk
);
1409 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1412 /* Possibly, free the chunk. */
1413 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1415 /* Release our reference on the message tracker. */
1417 sctp_datamsg_put(chunk
->msg
);
1419 sctp_chunk_put(chunk
);
1422 /* Grab a reference to the chunk. */
1423 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1425 atomic_inc(&ch
->refcnt
);
1428 /* Release a reference to the chunk. */
1429 void sctp_chunk_put(struct sctp_chunk
*ch
)
1431 if (atomic_dec_and_test(&ch
->refcnt
))
1432 sctp_chunk_destroy(ch
);
1435 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1438 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1442 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1443 int padlen
= WORD_ROUND(chunklen
) - chunklen
;
1445 padding
= skb_put(chunk
->skb
, padlen
);
1446 target
= skb_put(chunk
->skb
, len
);
1448 memset(padding
, 0, padlen
);
1449 memcpy(target
, data
, len
);
1451 /* Adjust the chunk length field. */
1452 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1453 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1458 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1459 * space in the chunk
1461 void *sctp_addto_chunk_fixed(struct sctp_chunk
*chunk
,
1462 int len
, const void *data
)
1464 if (skb_tailroom(chunk
->skb
) >= len
)
1465 return sctp_addto_chunk(chunk
, len
, data
);
1470 /* Append bytes from user space to the end of a chunk. Will panic if
1471 * chunk is not big enough.
1472 * Returns a kernel err value.
1474 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int off
, int len
,
1480 /* Make room in chunk for data. */
1481 target
= skb_put(chunk
->skb
, len
);
1483 /* Copy data (whole iovec) into chunk */
1484 if ((err
= memcpy_fromiovecend(target
, data
, off
, len
)))
1487 /* Adjust the chunk length field. */
1488 chunk
->chunk_hdr
->length
=
1489 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1490 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1496 /* Helper function to assign a TSN if needed. This assumes that both
1497 * the data_hdr and association have already been assigned.
1499 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1501 struct sctp_datamsg
*msg
;
1502 struct sctp_chunk
*lchunk
;
1503 struct sctp_stream
*stream
;
1510 /* All fragments will be on the same stream */
1511 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1512 stream
= &chunk
->asoc
->ssnmap
->out
;
1514 /* Now assign the sequence number to the entire message.
1515 * All fragments must have the same stream sequence number.
1518 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1519 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1522 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1523 ssn
= sctp_ssn_next(stream
, sid
);
1525 ssn
= sctp_ssn_peek(stream
, sid
);
1528 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1529 lchunk
->has_ssn
= 1;
1533 /* Helper function to assign a TSN if needed. This assumes that both
1534 * the data_hdr and association have already been assigned.
1536 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1538 if (!chunk
->has_tsn
) {
1539 /* This is the last possible instant to
1542 chunk
->subh
.data_hdr
->tsn
=
1543 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1548 /* Create a CLOSED association to use with an incoming packet. */
1549 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1550 struct sctp_chunk
*chunk
,
1553 struct sctp_association
*asoc
;
1554 struct sk_buff
*skb
;
1558 /* Create the bare association. */
1559 scope
= sctp_scope(sctp_source(chunk
));
1560 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1565 /* Create an entry for the source address of the packet. */
1566 af
= sctp_get_af_specific(ipver2af(ip_hdr(skb
)->version
));
1569 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1574 sctp_association_free(asoc
);
1578 /* Build a cookie representing asoc.
1579 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1581 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1582 const struct sctp_association
*asoc
,
1583 const struct sctp_chunk
*init_chunk
,
1585 const __u8
*raw_addrs
, int addrs_len
)
1587 sctp_cookie_param_t
*retval
;
1588 struct sctp_signed_cookie
*cookie
;
1589 struct scatterlist sg
;
1590 int headersize
, bodysize
;
1591 unsigned int keylen
;
1594 /* Header size is static data prior to the actual cookie, including
1597 headersize
= sizeof(sctp_paramhdr_t
) +
1598 (sizeof(struct sctp_signed_cookie
) -
1599 sizeof(struct sctp_cookie
));
1600 bodysize
= sizeof(struct sctp_cookie
)
1601 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1603 /* Pad out the cookie to a multiple to make the signature
1604 * functions simpler to write.
1606 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1607 bodysize
+= SCTP_COOKIE_MULTIPLE
1608 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1609 *cookie_len
= headersize
+ bodysize
;
1611 /* Clear this memory since we are sending this data structure
1612 * out on the network.
1614 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1618 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1620 /* Set up the parameter header. */
1621 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1622 retval
->p
.length
= htons(*cookie_len
);
1624 /* Copy the cookie part of the association itself. */
1625 cookie
->c
= asoc
->c
;
1626 /* Save the raw address list length in the cookie. */
1627 cookie
->c
.raw_addr_list_len
= addrs_len
;
1629 /* Remember PR-SCTP capability. */
1630 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1632 /* Save adaptation indication in the cookie. */
1633 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1635 /* Set an expiration time for the cookie. */
1636 do_gettimeofday(&cookie
->c
.expiration
);
1637 TIMEVAL_ADD(asoc
->cookie_life
, cookie
->c
.expiration
);
1639 /* Copy the peer's init packet. */
1640 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1641 ntohs(init_chunk
->chunk_hdr
->length
));
1643 /* Copy the raw local address list of the association. */
1644 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1645 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1647 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1648 struct hash_desc desc
;
1650 /* Sign the message. */
1651 sg_init_one(&sg
, &cookie
->c
, bodysize
);
1652 keylen
= SCTP_SECRET_SIZE
;
1653 key
= (char *)ep
->secret_key
[ep
->current_key
];
1654 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1657 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1658 crypto_hash_digest(&desc
, &sg
, bodysize
, cookie
->signature
))
1671 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1672 struct sctp_association
*sctp_unpack_cookie(
1673 const struct sctp_endpoint
*ep
,
1674 const struct sctp_association
*asoc
,
1675 struct sctp_chunk
*chunk
, gfp_t gfp
,
1676 int *error
, struct sctp_chunk
**errp
)
1678 struct sctp_association
*retval
= NULL
;
1679 struct sctp_signed_cookie
*cookie
;
1680 struct sctp_cookie
*bear_cookie
;
1681 int headersize
, bodysize
, fixed_size
;
1682 __u8
*digest
= ep
->digest
;
1683 struct scatterlist sg
;
1684 unsigned int keylen
, len
;
1687 struct sk_buff
*skb
= chunk
->skb
;
1689 struct hash_desc desc
;
1691 /* Header size is static data prior to the actual cookie, including
1694 headersize
= sizeof(sctp_chunkhdr_t
) +
1695 (sizeof(struct sctp_signed_cookie
) -
1696 sizeof(struct sctp_cookie
));
1697 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1698 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1700 /* Verify that the chunk looks like it even has a cookie.
1701 * There must be enough room for our cookie and our peer's
1704 len
= ntohs(chunk
->chunk_hdr
->length
);
1705 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1708 /* Verify that the cookie has been padded out. */
1709 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1712 /* Process the cookie. */
1713 cookie
= chunk
->subh
.cookie_hdr
;
1714 bear_cookie
= &cookie
->c
;
1716 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1719 /* Check the signature. */
1720 keylen
= SCTP_SECRET_SIZE
;
1721 sg_init_one(&sg
, bear_cookie
, bodysize
);
1722 key
= (char *)ep
->secret_key
[ep
->current_key
];
1723 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1726 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1727 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1728 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1729 *error
= -SCTP_IERROR_NOMEM
;
1733 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1734 /* Try the previous key. */
1735 key
= (char *)ep
->secret_key
[ep
->last_key
];
1736 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1737 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1738 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1739 *error
= -SCTP_IERROR_NOMEM
;
1743 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1744 /* Yikes! Still bad signature! */
1745 *error
= -SCTP_IERROR_BAD_SIG
;
1751 /* IG Section 2.35.2:
1752 * 3) Compare the port numbers and the verification tag contained
1753 * within the COOKIE ECHO chunk to the actual port numbers and the
1754 * verification tag within the SCTP common header of the received
1755 * packet. If these values do not match the packet MUST be silently
1758 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1759 *error
= -SCTP_IERROR_BAD_TAG
;
1763 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1764 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1765 *error
= -SCTP_IERROR_BAD_PORTS
;
1769 /* Check to see if the cookie is stale. If there is already
1770 * an association, there is no need to check cookie's expiration
1771 * for init collision case of lost COOKIE ACK.
1772 * If skb has been timestamped, then use the stamp, otherwise
1773 * use current time. This introduces a small possibility that
1774 * that a cookie may be considered expired, but his would only slow
1775 * down the new association establishment instead of every packet.
1777 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1778 skb_get_timestamp(skb
, &tv
);
1780 do_gettimeofday(&tv
);
1782 if (!asoc
&& tv_lt(bear_cookie
->expiration
, tv
)) {
1784 * Section 3.3.10.3 Stale Cookie Error (3)
1788 * Stale Cookie Error: Indicates the receipt of a valid State
1789 * Cookie that has expired.
1791 len
= ntohs(chunk
->chunk_hdr
->length
);
1792 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1794 suseconds_t usecs
= (tv
.tv_sec
-
1795 bear_cookie
->expiration
.tv_sec
) * 1000000L +
1796 tv
.tv_usec
- bear_cookie
->expiration
.tv_usec
;
1797 __be32 n
= htonl(usecs
);
1799 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1801 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1802 *error
= -SCTP_IERROR_STALE_COOKIE
;
1804 *error
= -SCTP_IERROR_NOMEM
;
1809 /* Make a new base association. */
1810 scope
= sctp_scope(sctp_source(chunk
));
1811 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1813 *error
= -SCTP_IERROR_NOMEM
;
1817 /* Set up our peer's port number. */
1818 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1820 /* Populate the association from the cookie. */
1821 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1823 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1825 *error
= -SCTP_IERROR_NOMEM
;
1829 /* Also, add the destination address. */
1830 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1831 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1832 SCTP_ADDR_SRC
, GFP_ATOMIC
);
1835 retval
->next_tsn
= retval
->c
.initial_tsn
;
1836 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1837 retval
->addip_serial
= retval
->c
.initial_tsn
;
1838 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1839 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1840 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1842 /* The INIT stuff will be done by the side effects. */
1847 sctp_association_free(retval
);
1852 /* Yikes! The packet is either corrupt or deliberately
1855 *error
= -SCTP_IERROR_MALFORMED
;
1859 /********************************************************************
1860 * 3rd Level Abstractions
1861 ********************************************************************/
1863 struct __sctp_missing
{
1869 * Report a missing mandatory parameter.
1871 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1872 sctp_param_t paramtype
,
1873 struct sctp_chunk
*chunk
,
1874 struct sctp_chunk
**errp
)
1876 struct __sctp_missing report
;
1879 len
= WORD_ROUND(sizeof(report
));
1881 /* Make an ERROR chunk, preparing enough room for
1882 * returning multiple unknown parameters.
1885 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1888 report
.num_missing
= htonl(1);
1889 report
.type
= paramtype
;
1890 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1892 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1895 /* Stop processing this chunk. */
1899 /* Report an Invalid Mandatory Parameter. */
1900 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1901 struct sctp_chunk
*chunk
,
1902 struct sctp_chunk
**errp
)
1904 /* Invalid Mandatory Parameter Error has no payload. */
1907 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1910 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1912 /* Stop processing this chunk. */
1916 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1917 struct sctp_paramhdr
*param
,
1918 const struct sctp_chunk
*chunk
,
1919 struct sctp_chunk
**errp
)
1921 /* This is a fatal error. Any accumulated non-fatal errors are
1925 sctp_chunk_free(*errp
);
1927 /* Create an error chunk and fill it in with our payload. */
1928 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1934 /* Do not attempt to handle the HOST_NAME parm. However, do
1935 * send back an indicator to the peer.
1937 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1938 union sctp_params param
,
1939 struct sctp_chunk
*chunk
,
1940 struct sctp_chunk
**errp
)
1942 __u16 len
= ntohs(param
.p
->length
);
1944 /* Processing of the HOST_NAME parameter will generate an
1945 * ABORT. If we've accumulated any non-fatal errors, they
1946 * would be unrecognized parameters and we should not include
1947 * them in the ABORT.
1950 sctp_chunk_free(*errp
);
1952 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1955 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1956 sctp_addto_chunk(*errp
, len
, param
.v
);
1959 /* Stop processing this chunk. */
1963 static int sctp_verify_ext_param(struct net
*net
, union sctp_params param
)
1965 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1967 int have_asconf
= 0;
1970 for (i
= 0; i
< num_ext
; i
++) {
1971 switch (param
.ext
->chunks
[i
]) {
1975 case SCTP_CID_ASCONF
:
1976 case SCTP_CID_ASCONF_ACK
:
1982 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1983 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1984 * only if ADD-IP is turned on and we are not backward-compatible
1987 if (net
->sctp
.addip_noauth
)
1990 if (net
->sctp
.addip_enable
&& !have_auth
&& have_asconf
)
1996 static void sctp_process_ext_param(struct sctp_association
*asoc
,
1997 union sctp_params param
)
1999 struct net
*net
= sock_net(asoc
->base
.sk
);
2000 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2003 for (i
= 0; i
< num_ext
; i
++) {
2004 switch (param
.ext
->chunks
[i
]) {
2005 case SCTP_CID_FWD_TSN
:
2006 if (net
->sctp
.prsctp_enable
&&
2007 !asoc
->peer
.prsctp_capable
)
2008 asoc
->peer
.prsctp_capable
= 1;
2011 /* if the peer reports AUTH, assume that he
2014 if (net
->sctp
.auth_enable
)
2015 asoc
->peer
.auth_capable
= 1;
2017 case SCTP_CID_ASCONF
:
2018 case SCTP_CID_ASCONF_ACK
:
2019 if (net
->sctp
.addip_enable
)
2020 asoc
->peer
.asconf_capable
= 1;
2028 /* RFC 3.2.1 & the Implementers Guide 2.2.
2030 * The Parameter Types are encoded such that the
2031 * highest-order two bits specify the action that must be
2032 * taken if the processing endpoint does not recognize the
2035 * 00 - Stop processing this parameter; do not process any further
2036 * parameters within this chunk
2038 * 01 - Stop processing this parameter, do not process any further
2039 * parameters within this chunk, and report the unrecognized
2040 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2042 * 10 - Skip this parameter and continue processing.
2044 * 11 - Skip this parameter and continue processing but
2045 * report the unrecognized parameter in an
2046 * 'Unrecognized Parameter' ERROR chunk.
2049 * SCTP_IERROR_NO_ERROR - continue with the chunk
2050 * SCTP_IERROR_ERROR - stop and report an error.
2051 * SCTP_IERROR_NOMEME - out of memory.
2053 static sctp_ierror_t
sctp_process_unk_param(const struct sctp_association
*asoc
,
2054 union sctp_params param
,
2055 struct sctp_chunk
*chunk
,
2056 struct sctp_chunk
**errp
)
2058 int retval
= SCTP_IERROR_NO_ERROR
;
2060 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2061 case SCTP_PARAM_ACTION_DISCARD
:
2062 retval
= SCTP_IERROR_ERROR
;
2064 case SCTP_PARAM_ACTION_SKIP
:
2066 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2067 retval
= SCTP_IERROR_ERROR
;
2069 case SCTP_PARAM_ACTION_SKIP_ERR
:
2070 /* Make an ERROR chunk, preparing enough room for
2071 * returning multiple unknown parameters.
2074 *errp
= sctp_make_op_error_fixed(asoc
, chunk
);
2077 if (!sctp_init_cause_fixed(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2078 WORD_ROUND(ntohs(param
.p
->length
))))
2079 sctp_addto_chunk_fixed(*errp
,
2080 WORD_ROUND(ntohs(param
.p
->length
)),
2083 /* If there is no memory for generating the ERROR
2084 * report as specified, an ABORT will be triggered
2085 * to the peer and the association won't be
2088 retval
= SCTP_IERROR_NOMEM
;
2098 /* Verify variable length parameters
2100 * SCTP_IERROR_ABORT - trigger an ABORT
2101 * SCTP_IERROR_NOMEM - out of memory (abort)
2102 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2103 * SCTP_IERROR_NO_ERROR - continue with the chunk
2105 static sctp_ierror_t
sctp_verify_param(struct net
*net
,
2106 const struct sctp_association
*asoc
,
2107 union sctp_params param
,
2109 struct sctp_chunk
*chunk
,
2110 struct sctp_chunk
**err_chunk
)
2112 struct sctp_hmac_algo_param
*hmacs
;
2113 int retval
= SCTP_IERROR_NO_ERROR
;
2114 __u16 n_elt
, id
= 0;
2117 /* FIXME - This routine is not looking at each parameter per the
2118 * chunk type, i.e., unrecognized parameters should be further
2119 * identified based on the chunk id.
2122 switch (param
.p
->type
) {
2123 case SCTP_PARAM_IPV4_ADDRESS
:
2124 case SCTP_PARAM_IPV6_ADDRESS
:
2125 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2126 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2127 case SCTP_PARAM_STATE_COOKIE
:
2128 case SCTP_PARAM_HEARTBEAT_INFO
:
2129 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2130 case SCTP_PARAM_ECN_CAPABLE
:
2131 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2134 case SCTP_PARAM_SUPPORTED_EXT
:
2135 if (!sctp_verify_ext_param(net
, param
))
2136 return SCTP_IERROR_ABORT
;
2139 case SCTP_PARAM_SET_PRIMARY
:
2140 if (net
->sctp
.addip_enable
)
2144 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2145 /* Tell the peer, we won't support this param. */
2146 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2147 retval
= SCTP_IERROR_ABORT
;
2150 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2151 if (net
->sctp
.prsctp_enable
)
2155 case SCTP_PARAM_RANDOM
:
2156 if (!net
->sctp
.auth_enable
)
2159 /* SCTP-AUTH: Secion 6.1
2160 * If the random number is not 32 byte long the association
2161 * MUST be aborted. The ABORT chunk SHOULD contain the error
2162 * cause 'Protocol Violation'.
2164 if (SCTP_AUTH_RANDOM_LENGTH
!=
2165 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) {
2166 sctp_process_inv_paramlength(asoc
, param
.p
,
2168 retval
= SCTP_IERROR_ABORT
;
2172 case SCTP_PARAM_CHUNKS
:
2173 if (!net
->sctp
.auth_enable
)
2176 /* SCTP-AUTH: Section 3.2
2177 * The CHUNKS parameter MUST be included once in the INIT or
2178 * INIT-ACK chunk if the sender wants to receive authenticated
2179 * chunks. Its maximum length is 260 bytes.
2181 if (260 < ntohs(param
.p
->length
)) {
2182 sctp_process_inv_paramlength(asoc
, param
.p
,
2184 retval
= SCTP_IERROR_ABORT
;
2188 case SCTP_PARAM_HMAC_ALGO
:
2189 if (!net
->sctp
.auth_enable
)
2192 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2193 n_elt
= (ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) >> 1;
2195 /* SCTP-AUTH: Section 6.1
2196 * The HMAC algorithm based on SHA-1 MUST be supported and
2197 * included in the HMAC-ALGO parameter.
2199 for (i
= 0; i
< n_elt
; i
++) {
2200 id
= ntohs(hmacs
->hmac_ids
[i
]);
2202 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2206 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2207 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2209 retval
= SCTP_IERROR_ABORT
;
2214 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2215 ntohs(param
.p
->type
), cid
);
2216 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2222 /* Verify the INIT packet before we process it. */
2223 int sctp_verify_init(struct net
*net
, const struct sctp_association
*asoc
,
2225 sctp_init_chunk_t
*peer_init
,
2226 struct sctp_chunk
*chunk
,
2227 struct sctp_chunk
**errp
)
2229 union sctp_params param
;
2233 /* Verify stream values are non-zero. */
2234 if ((0 == peer_init
->init_hdr
.num_outbound_streams
) ||
2235 (0 == peer_init
->init_hdr
.num_inbound_streams
) ||
2236 (0 == peer_init
->init_hdr
.init_tag
) ||
2237 (SCTP_DEFAULT_MINWINDOW
> ntohl(peer_init
->init_hdr
.a_rwnd
))) {
2239 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2242 /* Check for missing mandatory parameters. */
2243 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2245 if (SCTP_PARAM_STATE_COOKIE
== param
.p
->type
)
2248 } /* for (loop through all parameters) */
2250 /* There is a possibility that a parameter length was bad and
2251 * in that case we would have stoped walking the parameters.
2252 * The current param.p would point at the bad one.
2253 * Current consensus on the mailing list is to generate a PROTOCOL
2254 * VIOLATION error. We build the ERROR chunk here and let the normal
2255 * error handling code build and send the packet.
2257 if (param
.v
!= (void*)chunk
->chunk_end
)
2258 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2260 /* The only missing mandatory param possible today is
2261 * the state cookie for an INIT-ACK chunk.
2263 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2264 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2267 /* Verify all the variable length parameters */
2268 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2270 result
= sctp_verify_param(net
, asoc
, param
, cid
, chunk
, errp
);
2272 case SCTP_IERROR_ABORT
:
2273 case SCTP_IERROR_NOMEM
:
2275 case SCTP_IERROR_ERROR
:
2277 case SCTP_IERROR_NO_ERROR
:
2282 } /* for (loop through all parameters) */
2287 /* Unpack the parameters in an INIT packet into an association.
2288 * Returns 0 on failure, else success.
2289 * FIXME: This is an association method.
2291 int sctp_process_init(struct sctp_association
*asoc
, struct sctp_chunk
*chunk
,
2292 const union sctp_addr
*peer_addr
,
2293 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
2295 struct net
*net
= sock_net(asoc
->base
.sk
);
2296 union sctp_params param
;
2297 struct sctp_transport
*transport
;
2298 struct list_head
*pos
, *temp
;
2300 union sctp_addr addr
;
2304 /* We must include the address that the INIT packet came from.
2305 * This is the only address that matters for an INIT packet.
2306 * When processing a COOKIE ECHO, we retrieve the from address
2307 * of the INIT from the cookie.
2310 /* This implementation defaults to making the first transport
2311 * added as the primary transport. The source address seems to
2312 * be a a better choice than any of the embedded addresses.
2314 if(!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2317 if (sctp_cmp_addr_exact(sctp_source(chunk
), peer_addr
))
2320 /* Process the initialization parameters. */
2321 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2322 if (!src_match
&& (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
2323 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)) {
2324 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2325 af
->from_addr_param(&addr
, param
.addr
,
2326 chunk
->sctp_hdr
->source
, 0);
2327 if (sctp_cmp_addr_exact(sctp_source(chunk
), &addr
))
2331 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2335 /* source address of chunk may not match any valid address */
2339 /* AUTH: After processing the parameters, make sure that we
2340 * have all the required info to potentially do authentications.
2342 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2343 !asoc
->peer
.peer_hmacs
))
2344 asoc
->peer
.auth_capable
= 0;
2346 /* In a non-backward compatible mode, if the peer claims
2347 * support for ADD-IP but not AUTH, the ADD-IP spec states
2348 * that we MUST ABORT the association. Section 6. The section
2349 * also give us an option to silently ignore the packet, which
2350 * is what we'll do here.
2352 if (!net
->sctp
.addip_noauth
&&
2353 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2354 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2356 SCTP_PARAM_SET_PRIMARY
);
2357 asoc
->peer
.asconf_capable
= 0;
2361 /* Walk list of transports, removing transports in the UNKNOWN state. */
2362 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2363 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2364 if (transport
->state
== SCTP_UNKNOWN
) {
2365 sctp_assoc_rm_peer(asoc
, transport
);
2369 /* The fixed INIT headers are always in network byte
2372 asoc
->peer
.i
.init_tag
=
2373 ntohl(peer_init
->init_hdr
.init_tag
);
2374 asoc
->peer
.i
.a_rwnd
=
2375 ntohl(peer_init
->init_hdr
.a_rwnd
);
2376 asoc
->peer
.i
.num_outbound_streams
=
2377 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2378 asoc
->peer
.i
.num_inbound_streams
=
2379 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2380 asoc
->peer
.i
.initial_tsn
=
2381 ntohl(peer_init
->init_hdr
.initial_tsn
);
2383 /* Apply the upper bounds for output streams based on peer's
2384 * number of inbound streams.
2386 if (asoc
->c
.sinit_num_ostreams
>
2387 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2388 asoc
->c
.sinit_num_ostreams
=
2389 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2392 if (asoc
->c
.sinit_max_instreams
>
2393 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2394 asoc
->c
.sinit_max_instreams
=
2395 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2398 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2399 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2401 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2402 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2404 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2405 cookie
= asoc
->peer
.cookie
;
2407 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2408 if (!asoc
->peer
.cookie
)
2412 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2413 * high (for example, implementations MAY use the size of the receiver
2414 * advertised window).
2416 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2418 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2421 /* Set up the TSN tracking pieces. */
2422 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2423 asoc
->peer
.i
.initial_tsn
, gfp
))
2426 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2428 * The stream sequence number in all the streams shall start
2429 * from 0 when the association is established. Also, when the
2430 * stream sequence number reaches the value 65535 the next
2431 * stream sequence number shall be set to 0.
2434 /* Allocate storage for the negotiated streams if it is not a temporary
2440 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
2441 asoc
->c
.sinit_num_ostreams
, gfp
);
2445 error
= sctp_assoc_set_id(asoc
, gfp
);
2450 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2452 * When an endpoint has an ASCONF signaled change to be sent to the
2453 * remote endpoint it should do the following:
2455 * A2) A serial number should be assigned to the Chunk. The serial
2456 * number should be a monotonically increasing number. All serial
2457 * numbers are defined to be initialized at the start of the
2458 * association to the same value as the Initial TSN.
2460 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2464 /* Release the transport structures. */
2465 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2466 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2467 if (transport
->state
!= SCTP_ACTIVE
)
2468 sctp_assoc_rm_peer(asoc
, transport
);
2476 /* Update asoc with the option described in param.
2478 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2480 * asoc is the association to update.
2481 * param is the variable length parameter to use for update.
2482 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2483 * If the current packet is an INIT we want to minimize the amount of
2484 * work we do. In particular, we should not build transport
2485 * structures for the addresses.
2487 static int sctp_process_param(struct sctp_association
*asoc
,
2488 union sctp_params param
,
2489 const union sctp_addr
*peer_addr
,
2492 struct net
*net
= sock_net(asoc
->base
.sk
);
2493 union sctp_addr addr
;
2500 union sctp_addr_param
*addr_param
;
2501 struct sctp_transport
*t
;
2503 /* We maintain all INIT parameters in network byte order all the
2504 * time. This allows us to not worry about whether the parameters
2505 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2507 switch (param
.p
->type
) {
2508 case SCTP_PARAM_IPV6_ADDRESS
:
2509 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2513 case SCTP_PARAM_IPV4_ADDRESS
:
2514 /* v4 addresses are not allowed on v6-only socket */
2515 if (ipv6_only_sock(asoc
->base
.sk
))
2518 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2519 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2520 scope
= sctp_scope(peer_addr
);
2521 if (sctp_in_scope(net
, &addr
, scope
))
2522 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2526 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2527 if (!net
->sctp
.cookie_preserve_enable
)
2530 stale
= ntohl(param
.life
->lifespan_increment
);
2532 /* Suggested Cookie Life span increment's unit is msec,
2535 asoc
->cookie_life
.tv_sec
+= stale
/ 1000;
2536 asoc
->cookie_life
.tv_usec
+= (stale
% 1000) * 1000;
2539 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2540 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2543 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2544 /* Turn off the default values first so we'll know which
2545 * ones are really set by the peer.
2547 asoc
->peer
.ipv4_address
= 0;
2548 asoc
->peer
.ipv6_address
= 0;
2550 /* Assume that peer supports the address family
2551 * by which it sends a packet.
2553 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2554 asoc
->peer
.ipv6_address
= 1;
2555 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2556 asoc
->peer
.ipv4_address
= 1;
2558 /* Cycle through address types; avoid divide by 0. */
2559 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2561 sat
/= sizeof(__u16
);
2563 for (i
= 0; i
< sat
; ++i
) {
2564 switch (param
.sat
->types
[i
]) {
2565 case SCTP_PARAM_IPV4_ADDRESS
:
2566 asoc
->peer
.ipv4_address
= 1;
2569 case SCTP_PARAM_IPV6_ADDRESS
:
2570 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2571 asoc
->peer
.ipv6_address
= 1;
2574 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2575 asoc
->peer
.hostname_address
= 1;
2578 default: /* Just ignore anything else. */
2584 case SCTP_PARAM_STATE_COOKIE
:
2585 asoc
->peer
.cookie_len
=
2586 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2587 asoc
->peer
.cookie
= param
.cookie
->body
;
2590 case SCTP_PARAM_HEARTBEAT_INFO
:
2591 /* Would be odd to receive, but it causes no problems. */
2594 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2595 /* Rejected during verify stage. */
2598 case SCTP_PARAM_ECN_CAPABLE
:
2599 asoc
->peer
.ecn_capable
= 1;
2602 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2603 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2606 case SCTP_PARAM_SET_PRIMARY
:
2607 if (!net
->sctp
.addip_enable
)
2610 addr_param
= param
.v
+ sizeof(sctp_addip_param_t
);
2612 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2613 af
->from_addr_param(&addr
, addr_param
,
2614 htons(asoc
->peer
.port
), 0);
2616 /* if the address is invalid, we can't process it.
2617 * XXX: see spec for what to do.
2619 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2622 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2626 sctp_assoc_set_primary(asoc
, t
);
2629 case SCTP_PARAM_SUPPORTED_EXT
:
2630 sctp_process_ext_param(asoc
, param
);
2633 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2634 if (net
->sctp
.prsctp_enable
) {
2635 asoc
->peer
.prsctp_capable
= 1;
2641 case SCTP_PARAM_RANDOM
:
2642 if (!net
->sctp
.auth_enable
)
2645 /* Save peer's random parameter */
2646 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2647 ntohs(param
.p
->length
), gfp
);
2648 if (!asoc
->peer
.peer_random
) {
2654 case SCTP_PARAM_HMAC_ALGO
:
2655 if (!net
->sctp
.auth_enable
)
2658 /* Save peer's HMAC list */
2659 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2660 ntohs(param
.p
->length
), gfp
);
2661 if (!asoc
->peer
.peer_hmacs
) {
2666 /* Set the default HMAC the peer requested*/
2667 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2670 case SCTP_PARAM_CHUNKS
:
2671 if (!net
->sctp
.auth_enable
)
2674 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2675 ntohs(param
.p
->length
), gfp
);
2676 if (!asoc
->peer
.peer_chunks
)
2681 /* Any unrecognized parameters should have been caught
2682 * and handled by sctp_verify_param() which should be
2683 * called prior to this routine. Simply log the error
2686 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2687 ntohs(param
.p
->type
), asoc
);
2694 /* Select a new verification tag. */
2695 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2697 /* I believe that this random number generator complies with RFC1750.
2698 * A tag of 0 is reserved for special cases (e.g. INIT).
2703 get_random_bytes(&x
, sizeof(__u32
));
2709 /* Select an initial TSN to send during startup. */
2710 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2714 get_random_bytes(&retval
, sizeof(__u32
));
2719 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2721 * 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
2722 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2723 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2724 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2726 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2727 * | Address Parameter |
2728 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2729 * | ASCONF Parameter #1 |
2730 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2734 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2735 * | ASCONF Parameter #N |
2736 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2738 * Address Parameter and other parameter will not be wrapped in this function
2740 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2741 union sctp_addr
*addr
,
2744 sctp_addiphdr_t asconf
;
2745 struct sctp_chunk
*retval
;
2746 int length
= sizeof(asconf
) + vparam_len
;
2747 union sctp_addr_param addrparam
;
2749 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2751 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2756 /* Create the chunk. */
2757 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF
, 0, length
);
2761 asconf
.serial
= htonl(asoc
->addip_serial
++);
2763 retval
->subh
.addip_hdr
=
2764 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2765 retval
->param_hdr
.v
=
2766 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2772 * 3.2.1 Add IP Address
2774 * 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
2775 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2776 * | Type = 0xC001 | Length = Variable |
2777 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2778 * | ASCONF-Request Correlation ID |
2779 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2780 * | Address Parameter |
2781 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2783 * 3.2.2 Delete IP Address
2785 * 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
2786 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2787 * | Type = 0xC002 | Length = Variable |
2788 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2789 * | ASCONF-Request Correlation ID |
2790 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2791 * | Address Parameter |
2792 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2795 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2796 union sctp_addr
*laddr
,
2797 struct sockaddr
*addrs
,
2801 sctp_addip_param_t param
;
2802 struct sctp_chunk
*retval
;
2803 union sctp_addr_param addr_param
;
2804 union sctp_addr
*addr
;
2807 int paramlen
= sizeof(param
);
2808 int addr_param_len
= 0;
2813 /* Get total length of all the address parameters. */
2815 for (i
= 0; i
< addrcnt
; i
++) {
2817 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2818 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2820 totallen
+= paramlen
;
2821 totallen
+= addr_param_len
;
2823 addr_buf
+= af
->sockaddr_len
;
2824 if (asoc
->asconf_addr_del_pending
&& !del_pickup
) {
2825 /* reuse the parameter length from the same scope one */
2826 totallen
+= paramlen
;
2827 totallen
+= addr_param_len
;
2829 SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen
);
2833 /* Create an asconf chunk with the required length. */
2834 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2838 /* Add the address parameters to the asconf chunk. */
2840 for (i
= 0; i
< addrcnt
; i
++) {
2842 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2843 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2844 param
.param_hdr
.type
= flags
;
2845 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2848 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2849 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2851 addr_buf
+= af
->sockaddr_len
;
2853 if (flags
== SCTP_PARAM_ADD_IP
&& del_pickup
) {
2854 addr
= asoc
->asconf_addr_del_pending
;
2855 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2856 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2857 param
.param_hdr
.type
= SCTP_PARAM_DEL_IP
;
2858 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2861 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2862 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2868 * 3.2.4 Set Primary IP Address
2870 * 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
2871 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2872 * | Type =0xC004 | Length = Variable |
2873 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2874 * | ASCONF-Request Correlation ID |
2875 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2876 * | Address Parameter |
2877 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2879 * Create an ASCONF chunk with Set Primary IP address parameter.
2881 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2882 union sctp_addr
*addr
)
2884 sctp_addip_param_t param
;
2885 struct sctp_chunk
*retval
;
2886 int len
= sizeof(param
);
2887 union sctp_addr_param addrparam
;
2889 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2891 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2896 /* Create the chunk and make asconf header. */
2897 retval
= sctp_make_asconf(asoc
, addr
, len
);
2901 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2902 param
.param_hdr
.length
= htons(len
);
2905 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2906 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2911 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2913 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2914 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2915 * | Type = 0x80 | Chunk Flags | Chunk Length |
2916 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2918 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2919 * | ASCONF Parameter Response#1 |
2920 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2924 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2925 * | ASCONF Parameter Response#N |
2926 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2928 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2930 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2931 __u32 serial
, int vparam_len
)
2933 sctp_addiphdr_t asconf
;
2934 struct sctp_chunk
*retval
;
2935 int length
= sizeof(asconf
) + vparam_len
;
2937 /* Create the chunk. */
2938 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
);
2942 asconf
.serial
= htonl(serial
);
2944 retval
->subh
.addip_hdr
=
2945 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2950 /* Add response parameters to an ASCONF_ACK chunk. */
2951 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2952 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2954 sctp_addip_param_t ack_param
;
2955 sctp_errhdr_t err_param
;
2956 int asconf_param_len
= 0;
2957 int err_param_len
= 0;
2958 __be16 response_type
;
2960 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2961 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2963 response_type
= SCTP_PARAM_ERR_CAUSE
;
2964 err_param_len
= sizeof(err_param
);
2967 ntohs(asconf_param
->param_hdr
.length
);
2970 /* Add Success Indication or Error Cause Indication parameter. */
2971 ack_param
.param_hdr
.type
= response_type
;
2972 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2975 ack_param
.crr_id
= crr_id
;
2976 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2978 if (SCTP_ERROR_NO_ERROR
== err_code
)
2981 /* Add Error Cause parameter. */
2982 err_param
.cause
= err_code
;
2983 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2984 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2986 /* Add the failed TLV copied from ASCONF chunk. */
2988 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
2991 /* Process a asconf parameter. */
2992 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
2993 struct sctp_chunk
*asconf
,
2994 sctp_addip_param_t
*asconf_param
)
2996 struct sctp_transport
*peer
;
2998 union sctp_addr addr
;
2999 union sctp_addr_param
*addr_param
;
3001 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3003 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
3004 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
3005 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
3006 return SCTP_ERROR_UNKNOWN_PARAM
;
3008 switch (addr_param
->p
.type
) {
3009 case SCTP_PARAM_IPV6_ADDRESS
:
3010 if (!asoc
->peer
.ipv6_address
)
3011 return SCTP_ERROR_DNS_FAILED
;
3013 case SCTP_PARAM_IPV4_ADDRESS
:
3014 if (!asoc
->peer
.ipv4_address
)
3015 return SCTP_ERROR_DNS_FAILED
;
3018 return SCTP_ERROR_DNS_FAILED
;
3021 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3023 return SCTP_ERROR_DNS_FAILED
;
3025 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
3027 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3028 * or multicast address.
3029 * (note: wildcard is permitted and requires special handling so
3030 * make sure we check for that)
3032 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
3033 return SCTP_ERROR_DNS_FAILED
;
3035 switch (asconf_param
->param_hdr
.type
) {
3036 case SCTP_PARAM_ADD_IP
:
3038 * If the address 0.0.0.0 or ::0 is provided, the source
3039 * address of the packet MUST be added.
3041 if (af
->is_any(&addr
))
3042 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
3044 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3045 * request and does not have the local resources to add this
3046 * new address to the association, it MUST return an Error
3047 * Cause TLV set to the new error code 'Operation Refused
3048 * Due to Resource Shortage'.
3051 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
3053 return SCTP_ERROR_RSRC_LOW
;
3055 /* Start the heartbeat timer. */
3056 if (!mod_timer(&peer
->hb_timer
, sctp_transport_timeout(peer
)))
3057 sctp_transport_hold(peer
);
3058 asoc
->new_transport
= peer
;
3060 case SCTP_PARAM_DEL_IP
:
3061 /* ADDIP 4.3 D7) If a request is received to delete the
3062 * last remaining IP address of a peer endpoint, the receiver
3063 * MUST send an Error Cause TLV with the error cause set to the
3064 * new error code 'Request to Delete Last Remaining IP Address'.
3066 if (asoc
->peer
.transport_count
== 1)
3067 return SCTP_ERROR_DEL_LAST_IP
;
3069 /* ADDIP 4.3 D8) If a request is received to delete an IP
3070 * address which is also the source address of the IP packet
3071 * which contained the ASCONF chunk, the receiver MUST reject
3072 * this request. To reject the request the receiver MUST send
3073 * an Error Cause TLV set to the new error code 'Request to
3074 * Delete Source IP Address'
3076 if (sctp_cmp_addr_exact(&asconf
->source
, &addr
))
3077 return SCTP_ERROR_DEL_SRC_IP
;
3080 * If the address 0.0.0.0 or ::0 is provided, all
3081 * addresses of the peer except the source address of the
3082 * packet MUST be deleted.
3084 if (af
->is_any(&addr
)) {
3085 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3086 sctp_assoc_del_nonprimary_peers(asoc
,
3089 sctp_assoc_del_peer(asoc
, &addr
);
3091 case SCTP_PARAM_SET_PRIMARY
:
3092 /* ADDIP Section 4.2.4
3093 * If the address 0.0.0.0 or ::0 is provided, the receiver
3094 * MAY mark the source address of the packet as its
3097 if (af
->is_any(&addr
))
3098 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3100 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3102 return SCTP_ERROR_DNS_FAILED
;
3104 sctp_assoc_set_primary(asoc
, peer
);
3108 return SCTP_ERROR_NO_ERROR
;
3111 /* Verify the ASCONF packet before we process it. */
3112 int sctp_verify_asconf(const struct sctp_association
*asoc
,
3113 struct sctp_paramhdr
*param_hdr
, void *chunk_end
,
3114 struct sctp_paramhdr
**errp
) {
3115 sctp_addip_param_t
*asconf_param
;
3116 union sctp_params param
;
3119 param
.v
= (sctp_paramhdr_t
*) param_hdr
;
3120 while (param
.v
<= chunk_end
- sizeof(sctp_paramhdr_t
)) {
3121 length
= ntohs(param
.p
->length
);
3124 if (param
.v
> chunk_end
- length
||
3125 length
< sizeof(sctp_paramhdr_t
))
3128 switch (param
.p
->type
) {
3129 case SCTP_PARAM_ADD_IP
:
3130 case SCTP_PARAM_DEL_IP
:
3131 case SCTP_PARAM_SET_PRIMARY
:
3132 asconf_param
= (sctp_addip_param_t
*)param
.v
;
3133 plen
= ntohs(asconf_param
->param_hdr
.length
);
3134 if (plen
< sizeof(sctp_addip_param_t
) +
3135 sizeof(sctp_paramhdr_t
))
3138 case SCTP_PARAM_SUCCESS_REPORT
:
3139 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3140 if (length
!= sizeof(sctp_addip_param_t
))
3148 param
.v
+= WORD_ROUND(length
);
3151 if (param
.v
!= chunk_end
)
3157 /* Process an incoming ASCONF chunk with the next expected serial no. and
3158 * return an ASCONF_ACK chunk to be sent in response.
3160 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3161 struct sctp_chunk
*asconf
)
3163 sctp_addiphdr_t
*hdr
;
3164 union sctp_addr_param
*addr_param
;
3165 sctp_addip_param_t
*asconf_param
;
3166 struct sctp_chunk
*asconf_ack
;
3172 int all_param_pass
= 1;
3174 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) - sizeof(sctp_chunkhdr_t
);
3175 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
3176 serial
= ntohl(hdr
->serial
);
3178 /* Skip the addiphdr and store a pointer to address parameter. */
3179 length
= sizeof(sctp_addiphdr_t
);
3180 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3181 chunk_len
-= length
;
3183 /* Skip the address parameter and store a pointer to the first
3186 length
= ntohs(addr_param
->p
.length
);
3187 asconf_param
= (void *)addr_param
+ length
;
3188 chunk_len
-= length
;
3190 /* create an ASCONF_ACK chunk.
3191 * Based on the definitions of parameters, we know that the size of
3192 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3195 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 4);
3199 /* Process the TLVs contained within the ASCONF chunk. */
3200 while (chunk_len
> 0) {
3201 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3204 * If an error response is received for a TLV parameter,
3205 * all TLVs with no response before the failed TLV are
3206 * considered successful if not reported. All TLVs after
3207 * the failed response are considered unsuccessful unless
3208 * a specific success indication is present for the parameter.
3210 if (SCTP_ERROR_NO_ERROR
!= err_code
)
3213 if (!all_param_pass
)
3214 sctp_add_asconf_response(asconf_ack
,
3215 asconf_param
->crr_id
, err_code
,
3218 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3219 * an IP address sends an 'Out of Resource' in its response, it
3220 * MUST also fail any subsequent add or delete requests bundled
3223 if (SCTP_ERROR_RSRC_LOW
== err_code
)
3226 /* Move to the next ASCONF param. */
3227 length
= ntohs(asconf_param
->param_hdr
.length
);
3228 asconf_param
= (void *)asconf_param
+ length
;
3229 chunk_len
-= length
;
3233 asoc
->peer
.addip_serial
++;
3235 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3236 * after freeing the reference to old asconf ack if any.
3239 sctp_chunk_hold(asconf_ack
);
3240 list_add_tail(&asconf_ack
->transmitted_list
,
3241 &asoc
->asconf_ack_list
);
3247 /* Process a asconf parameter that is successfully acked. */
3248 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3249 sctp_addip_param_t
*asconf_param
)
3252 union sctp_addr addr
;
3253 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3254 union sctp_addr_param
*addr_param
;
3255 struct sctp_transport
*transport
;
3256 struct sctp_sockaddr_entry
*saddr
;
3258 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3260 /* We have checked the packet before, so we do not check again. */
3261 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3262 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3264 switch (asconf_param
->param_hdr
.type
) {
3265 case SCTP_PARAM_ADD_IP
:
3266 /* This is always done in BH context with a socket lock
3267 * held, so the list can not change.
3270 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3271 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3272 saddr
->state
= SCTP_ADDR_SRC
;
3275 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3277 dst_release(transport
->dst
);
3278 transport
->dst
= NULL
;
3281 case SCTP_PARAM_DEL_IP
:
3283 sctp_del_bind_addr(bp
, &addr
);
3284 if (asoc
->asconf_addr_del_pending
!= NULL
&&
3285 sctp_cmp_addr_exact(asoc
->asconf_addr_del_pending
, &addr
)) {
3286 kfree(asoc
->asconf_addr_del_pending
);
3287 asoc
->asconf_addr_del_pending
= NULL
;
3290 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3292 dst_release(transport
->dst
);
3293 transport
->dst
= NULL
;
3301 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3302 * for the given asconf parameter. If there is no response for this parameter,
3303 * return the error code based on the third argument 'no_err'.
3305 * A7) If an error response is received for a TLV parameter, all TLVs with no
3306 * response before the failed TLV are considered successful if not reported.
3307 * All TLVs after the failed response are considered unsuccessful unless a
3308 * specific success indication is present for the parameter.
3310 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3311 sctp_addip_param_t
*asconf_param
,
3314 sctp_addip_param_t
*asconf_ack_param
;
3315 sctp_errhdr_t
*err_param
;
3321 err_code
= SCTP_ERROR_NO_ERROR
;
3323 err_code
= SCTP_ERROR_REQ_REFUSED
;
3325 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3326 sizeof(sctp_chunkhdr_t
);
3328 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3329 * the first asconf_ack parameter.
3331 length
= sizeof(sctp_addiphdr_t
);
3332 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
3334 asconf_ack_len
-= length
;
3336 while (asconf_ack_len
> 0) {
3337 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3338 switch(asconf_ack_param
->param_hdr
.type
) {
3339 case SCTP_PARAM_SUCCESS_REPORT
:
3340 return SCTP_ERROR_NO_ERROR
;
3341 case SCTP_PARAM_ERR_CAUSE
:
3342 length
= sizeof(sctp_addip_param_t
);
3343 err_param
= (void *)asconf_ack_param
+ length
;
3344 asconf_ack_len
-= length
;
3345 if (asconf_ack_len
> 0)
3346 return err_param
->cause
;
3348 return SCTP_ERROR_INV_PARAM
;
3351 return SCTP_ERROR_INV_PARAM
;
3355 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3356 asconf_ack_param
= (void *)asconf_ack_param
+ length
;
3357 asconf_ack_len
-= length
;
3363 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3364 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3365 struct sctp_chunk
*asconf_ack
)
3367 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3368 union sctp_addr_param
*addr_param
;
3369 sctp_addip_param_t
*asconf_param
;
3371 int asconf_len
= asconf
->skb
->len
;
3372 int all_param_pass
= 0;
3375 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3377 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3378 * a pointer to address parameter.
3380 length
= sizeof(sctp_addip_chunk_t
);
3381 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3382 asconf_len
-= length
;
3384 /* Skip the address parameter in the last asconf sent and store a
3385 * pointer to the first asconf parameter.
3387 length
= ntohs(addr_param
->p
.length
);
3388 asconf_param
= (void *)addr_param
+ length
;
3389 asconf_len
-= length
;
3392 * A8) If there is no response(s) to specific TLV parameter(s), and no
3393 * failures are indicated, then all request(s) are considered
3396 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
3399 /* Process the TLVs contained in the last sent ASCONF chunk. */
3400 while (asconf_len
> 0) {
3402 err_code
= SCTP_ERROR_NO_ERROR
;
3404 err_code
= sctp_get_asconf_response(asconf_ack
,
3407 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3412 case SCTP_ERROR_NO_ERROR
:
3413 sctp_asconf_param_success(asoc
, asconf_param
);
3416 case SCTP_ERROR_RSRC_LOW
:
3420 case SCTP_ERROR_UNKNOWN_PARAM
:
3421 /* Disable sending this type of asconf parameter in
3424 asoc
->peer
.addip_disabled_mask
|=
3425 asconf_param
->param_hdr
.type
;
3428 case SCTP_ERROR_REQ_REFUSED
:
3429 case SCTP_ERROR_DEL_LAST_IP
:
3430 case SCTP_ERROR_DEL_SRC_IP
:
3435 /* Skip the processed asconf parameter and move to the next
3438 length
= ntohs(asconf_param
->param_hdr
.length
);
3439 asconf_param
= (void *)asconf_param
+ length
;
3440 asconf_len
-= length
;
3443 if (no_err
&& asoc
->src_out_of_asoc_ok
) {
3444 asoc
->src_out_of_asoc_ok
= 0;
3445 sctp_transport_immediate_rtx(asoc
->peer
.primary_path
);
3448 /* Free the cached last sent asconf chunk. */
3449 list_del_init(&asconf
->transmitted_list
);
3450 sctp_chunk_free(asconf
);
3451 asoc
->addip_last_asconf
= NULL
;
3456 /* Make a FWD TSN chunk. */
3457 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3458 __u32 new_cum_tsn
, size_t nstreams
,
3459 struct sctp_fwdtsn_skip
*skiplist
)
3461 struct sctp_chunk
*retval
= NULL
;
3462 struct sctp_fwdtsn_hdr ftsn_hdr
;
3463 struct sctp_fwdtsn_skip skip
;
3467 hint
= (nstreams
+ 1) * sizeof(__u32
);
3469 retval
= sctp_make_chunk(asoc
, SCTP_CID_FWD_TSN
, 0, hint
);
3474 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3475 retval
->subh
.fwdtsn_hdr
=
3476 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3478 for (i
= 0; i
< nstreams
; i
++) {
3479 skip
.stream
= skiplist
[i
].stream
;
3480 skip
.ssn
= skiplist
[i
].ssn
;
3481 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);