1 /* SCTP kernel reference 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 reference 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 * The SCTP reference 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 * The SCTP reference 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 #include <linux/types.h>
54 #include <linux/kernel.h>
56 #include <linux/ipv6.h>
57 #include <linux/net.h>
58 #include <linux/inet.h>
59 #include <asm/scatterlist.h>
60 #include <linux/crypto.h>
63 #include <linux/skbuff.h>
64 #include <linux/random.h> /* for get_random_bytes */
65 #include <net/sctp/sctp.h>
66 #include <net/sctp/sm.h>
69 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
70 __u8 type
, __u8 flags
, int paylen
);
71 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
72 const struct sctp_association
*asoc
,
73 const struct sctp_chunk
*init_chunk
,
75 const __u8
*raw_addrs
, int addrs_len
);
76 static int sctp_process_param(struct sctp_association
*asoc
,
77 union sctp_params param
,
78 const union sctp_addr
*peer_addr
,
81 /* What was the inbound interface for this chunk? */
82 int sctp_chunk_iif(const struct sctp_chunk
*chunk
)
87 af
= sctp_get_af_specific(ipver2af(ip_hdr(chunk
->skb
)->version
));
89 iif
= af
->skb_iif(chunk
->skb
);
94 /* RFC 2960 3.3.2 Initiation (INIT) (1)
96 * Note 2: The ECN capable field is reserved for future use of
97 * Explicit Congestion Notification.
99 static const struct sctp_paramhdr ecap_param
= {
100 SCTP_PARAM_ECN_CAPABLE
,
101 __constant_htons(sizeof(struct sctp_paramhdr
)),
103 static const struct sctp_paramhdr prsctp_param
= {
104 SCTP_PARAM_FWD_TSN_SUPPORT
,
105 __constant_htons(sizeof(struct sctp_paramhdr
)),
108 /* A helper to initialize to initialize an op error inside a
109 * provided chunk, as most cause codes will be embedded inside an
112 void sctp_init_cause(struct sctp_chunk
*chunk
, __be16 cause_code
,
118 /* Cause code constants are now defined in network order. */
119 err
.cause
= cause_code
;
120 len
= sizeof(sctp_errhdr_t
) + paylen
;
121 err
.length
= htons(len
);
122 chunk
->subh
.err_hdr
= sctp_addto_chunk(chunk
, sizeof(sctp_errhdr_t
), &err
);
125 /* 3.3.2 Initiation (INIT) (1)
127 * This chunk is used to initiate a SCTP association between two
128 * endpoints. The format of the INIT chunk is shown below:
131 * 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
132 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
133 * | Type = 1 | Chunk Flags | Chunk Length |
134 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
136 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
137 * | Advertised Receiver Window Credit (a_rwnd) |
138 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
139 * | Number of Outbound Streams | Number of Inbound Streams |
140 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
142 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
144 * / Optional/Variable-Length Parameters /
146 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
149 * The INIT chunk contains the following parameters. Unless otherwise
150 * noted, each parameter MUST only be included once in the INIT chunk.
152 * Fixed Parameters Status
153 * ----------------------------------------------
154 * Initiate Tag Mandatory
155 * Advertised Receiver Window Credit Mandatory
156 * Number of Outbound Streams Mandatory
157 * Number of Inbound Streams Mandatory
158 * Initial TSN Mandatory
160 * Variable Parameters Status Type Value
161 * -------------------------------------------------------------
162 * IPv4 Address (Note 1) Optional 5
163 * IPv6 Address (Note 1) Optional 6
164 * Cookie Preservative Optional 9
165 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
166 * Host Name Address (Note 3) Optional 11
167 * Supported Address Types (Note 4) Optional 12
169 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
170 const struct sctp_bind_addr
*bp
,
171 gfp_t gfp
, int vparam_len
)
174 union sctp_params addrs
;
176 struct sctp_chunk
*retval
= NULL
;
177 int num_types
, addrs_len
= 0;
178 struct sctp_sock
*sp
;
179 sctp_supported_addrs_param_t sat
;
181 sctp_adaptation_ind_param_t aiparam
;
182 sctp_supported_ext_param_t ext_param
;
185 sctp_paramhdr_t
*auth_chunks
= NULL
,
188 /* RFC 2960 3.3.2 Initiation (INIT) (1)
190 * Note 1: The INIT chunks can contain multiple addresses that
191 * can be IPv4 and/or IPv6 in any combination.
195 /* Convert the provided bind address list to raw format. */
196 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
198 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
199 init
.a_rwnd
= htonl(asoc
->rwnd
);
200 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
201 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
202 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
204 /* How many address types are needed? */
205 sp
= sctp_sk(asoc
->base
.sk
);
206 num_types
= sp
->pf
->supported_addrs(sp
, types
);
208 chunksize
= sizeof(init
) + addrs_len
+ SCTP_SAT_LEN(num_types
);
209 chunksize
+= sizeof(ecap_param
);
210 if (sctp_prsctp_enable
) {
211 chunksize
+= sizeof(prsctp_param
);
212 extensions
[num_ext
] = SCTP_CID_FWD_TSN
;
215 /* ADDIP: Section 4.2.7:
216 * An implementation supporting this extension [ADDIP] MUST list
217 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
218 * INIT-ACK parameters.
220 if (sctp_addip_enable
) {
221 extensions
[num_ext
] = SCTP_CID_ASCONF
;
222 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
226 chunksize
+= sizeof(aiparam
);
227 chunksize
+= vparam_len
;
229 /* Account for AUTH related parameters */
230 if (sctp_auth_enable
) {
231 /* Add random parameter length*/
232 chunksize
+= sizeof(asoc
->c
.auth_random
);
234 /* Add HMACS parameter length if any were defined */
235 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
236 if (auth_hmacs
->length
)
237 chunksize
+= ntohs(auth_hmacs
->length
);
241 /* Add CHUNKS parameter length */
242 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
243 if (auth_chunks
->length
)
244 chunksize
+= ntohs(auth_chunks
->length
);
248 extensions
[num_ext
] = SCTP_CID_AUTH
;
252 /* If we have any extensions to report, account for that */
254 chunksize
+= sizeof(sctp_supported_ext_param_t
) + num_ext
;
256 /* RFC 2960 3.3.2 Initiation (INIT) (1)
258 * Note 3: An INIT chunk MUST NOT contain more than one Host
259 * Name address parameter. Moreover, the sender of the INIT
260 * MUST NOT combine any other address types with the Host Name
261 * address in the INIT. The receiver of INIT MUST ignore any
262 * other address types if the Host Name address parameter is
263 * present in the received INIT chunk.
265 * PLEASE DO NOT FIXME [This version does not support Host Name.]
268 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT
, 0, chunksize
);
272 retval
->subh
.init_hdr
=
273 sctp_addto_chunk(retval
, sizeof(init
), &init
);
274 retval
->param_hdr
.v
=
275 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
277 /* RFC 2960 3.3.2 Initiation (INIT) (1)
279 * Note 4: This parameter, when present, specifies all the
280 * address types the sending endpoint can support. The absence
281 * of this parameter indicates that the sending endpoint can
282 * support any address type.
284 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
285 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
286 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
287 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
289 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
291 /* Add the supported extensions paramter. Be nice and add this
292 * fist before addiding the parameters for the extensions themselves
295 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
296 ext_param
.param_hdr
.length
=
297 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
298 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
300 sctp_addto_chunk(retval
, num_ext
, extensions
);
303 if (sctp_prsctp_enable
)
304 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
306 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
307 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
308 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
309 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
311 /* Add SCTP-AUTH chunks to the parameter list */
312 if (sctp_auth_enable
) {
313 sctp_addto_chunk(retval
, sizeof(asoc
->c
.auth_random
),
314 asoc
->c
.auth_random
);
316 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
319 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
327 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
328 const struct sctp_chunk
*chunk
,
329 gfp_t gfp
, int unkparam_len
)
331 sctp_inithdr_t initack
;
332 struct sctp_chunk
*retval
;
333 union sctp_params addrs
;
335 sctp_cookie_param_t
*cookie
;
338 sctp_adaptation_ind_param_t aiparam
;
339 sctp_supported_ext_param_t ext_param
;
342 sctp_paramhdr_t
*auth_chunks
= NULL
,
348 /* Note: there may be no addresses to embed. */
349 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
351 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
352 initack
.a_rwnd
= htonl(asoc
->rwnd
);
353 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
354 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
355 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
357 /* FIXME: We really ought to build the cookie right
358 * into the packet instead of allocating more fresh memory.
360 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
365 /* Calculate the total size of allocation, include the reserved
366 * space for reporting unknown parameters if it is specified.
368 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
370 /* Tell peer that we'll do ECN only if peer advertised such cap. */
371 if (asoc
->peer
.ecn_capable
)
372 chunksize
+= sizeof(ecap_param
);
374 /* Tell peer that we'll do PR-SCTP only if peer advertised. */
375 if (asoc
->peer
.prsctp_capable
) {
376 chunksize
+= sizeof(prsctp_param
);
377 extensions
[num_ext
] = SCTP_CID_FWD_TSN
;
381 if (sctp_addip_enable
) {
382 extensions
[num_ext
] = SCTP_CID_ASCONF
;
383 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
387 chunksize
+= sizeof(ext_param
) + num_ext
;
388 chunksize
+= sizeof(aiparam
);
390 if (asoc
->peer
.auth_capable
) {
391 auth_random
= (sctp_paramhdr_t
*)asoc
->c
.auth_random
;
392 chunksize
+= ntohs(auth_random
->length
);
394 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
395 if (auth_hmacs
->length
)
396 chunksize
+= ntohs(auth_hmacs
->length
);
400 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
401 if (auth_chunks
->length
)
402 chunksize
+= ntohs(auth_chunks
->length
);
406 extensions
[num_ext
] = SCTP_CID_AUTH
;
410 /* Now allocate and fill out the chunk. */
411 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
);
415 /* Per the advice in RFC 2960 6.4, send this reply to
416 * the source of the INIT packet.
418 retval
->transport
= chunk
->transport
;
419 retval
->subh
.init_hdr
=
420 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
421 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
422 sctp_addto_chunk(retval
, cookie_len
, cookie
);
423 if (asoc
->peer
.ecn_capable
)
424 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
426 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
427 ext_param
.param_hdr
.length
=
428 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
429 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
431 sctp_addto_chunk(retval
, num_ext
, extensions
);
433 if (asoc
->peer
.prsctp_capable
)
434 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
436 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
437 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
438 aiparam
.adaptation_ind
= htonl(sctp_sk(asoc
->base
.sk
)->adaptation_ind
);
439 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
441 if (asoc
->peer
.auth_capable
) {
442 sctp_addto_chunk(retval
, ntohs(auth_random
->length
),
445 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
448 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
452 /* We need to remove the const qualifier at this point. */
453 retval
->asoc
= (struct sctp_association
*) asoc
;
455 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
457 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
458 * HEARTBEAT ACK, * etc.) to the same destination transport
459 * address from which it received the DATA or control chunk
460 * to which it is replying.
462 * [INIT ACK back to where the INIT came from.]
465 retval
->transport
= chunk
->transport
;
474 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
476 * This chunk is used only during the initialization of an association.
477 * It is sent by the initiator of an association to its peer to complete
478 * the initialization process. This chunk MUST precede any DATA chunk
479 * sent within the association, but MAY be bundled with one or more DATA
480 * chunks in the same packet.
483 * 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
484 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
485 * | Type = 10 |Chunk Flags | Length |
486 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
489 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
493 * Set to zero on transmit and ignored on receipt.
495 * Length: 16 bits (unsigned integer)
497 * Set to the size of the chunk in bytes, including the 4 bytes of
498 * the chunk header and the size of the Cookie.
500 * Cookie: variable size
502 * This field must contain the exact cookie received in the
503 * State Cookie parameter from the previous INIT ACK.
505 * An implementation SHOULD make the cookie as small as possible
506 * to insure interoperability.
508 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
509 const struct sctp_chunk
*chunk
)
511 struct sctp_chunk
*retval
;
515 cookie
= asoc
->peer
.cookie
;
516 cookie_len
= asoc
->peer
.cookie_len
;
518 /* Build a cookie echo chunk. */
519 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ECHO
, 0, cookie_len
);
522 retval
->subh
.cookie_hdr
=
523 sctp_addto_chunk(retval
, cookie_len
, cookie
);
525 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
527 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
528 * HEARTBEAT ACK, * etc.) to the same destination transport
529 * address from which it * received the DATA or control chunk
530 * to which it is replying.
532 * [COOKIE ECHO back to where the INIT ACK came from.]
535 retval
->transport
= chunk
->transport
;
541 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
543 * This chunk is used only during the initialization of an
544 * association. It is used to acknowledge the receipt of a COOKIE
545 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
546 * within the association, but MAY be bundled with one or more DATA
547 * chunks or SACK chunk in the same SCTP packet.
550 * 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
551 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552 * | Type = 11 |Chunk Flags | Length = 4 |
553 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
555 * Chunk Flags: 8 bits
557 * Set to zero on transmit and ignored on receipt.
559 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
560 const struct sctp_chunk
*chunk
)
562 struct sctp_chunk
*retval
;
564 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0);
566 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
568 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
569 * HEARTBEAT ACK, * etc.) to the same destination transport
570 * address from which it * received the DATA or control chunk
571 * to which it is replying.
573 * [COOKIE ACK back to where the COOKIE ECHO came from.]
576 retval
->transport
= chunk
->transport
;
582 * Appendix A: Explicit Congestion Notification:
585 * RFC 2481 details a specific bit for a sender to send in the header of
586 * its next outbound TCP segment to indicate to its peer that it has
587 * reduced its congestion window. This is termed the CWR bit. For
588 * SCTP the same indication is made by including the CWR chunk.
589 * This chunk contains one data element, i.e. the TSN number that
590 * was sent in the ECNE chunk. This element represents the lowest
591 * TSN number in the datagram that was originally marked with the
595 * 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
596 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
597 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
598 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
599 * | Lowest TSN Number |
600 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
602 * Note: The CWR is considered a Control chunk.
604 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
605 const __u32 lowest_tsn
,
606 const struct sctp_chunk
*chunk
)
608 struct sctp_chunk
*retval
;
611 cwr
.lowest_tsn
= htonl(lowest_tsn
);
612 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_CWR
, 0,
613 sizeof(sctp_cwrhdr_t
));
618 retval
->subh
.ecn_cwr_hdr
=
619 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
621 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
623 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
624 * HEARTBEAT ACK, * etc.) to the same destination transport
625 * address from which it * received the DATA or control chunk
626 * to which it is replying.
628 * [Report a reduced congestion window back to where the ECNE
632 retval
->transport
= chunk
->transport
;
638 /* Make an ECNE chunk. This is a congestion experienced report. */
639 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
640 const __u32 lowest_tsn
)
642 struct sctp_chunk
*retval
;
645 ecne
.lowest_tsn
= htonl(lowest_tsn
);
646 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_ECNE
, 0,
647 sizeof(sctp_ecnehdr_t
));
650 retval
->subh
.ecne_hdr
=
651 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
657 /* Make a DATA chunk for the given association from the provided
658 * parameters. However, do not populate the data payload.
660 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
661 const struct sctp_sndrcvinfo
*sinfo
,
662 int data_len
, __u8 flags
, __u16 ssn
)
664 struct sctp_chunk
*retval
;
665 struct sctp_datahdr dp
;
668 /* We assign the TSN as LATE as possible, not here when
669 * creating the chunk.
672 dp
.stream
= htons(sinfo
->sinfo_stream
);
673 dp
.ppid
= sinfo
->sinfo_ppid
;
675 /* Set the flags for an unordered send. */
676 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
677 flags
|= SCTP_DATA_UNORDERED
;
682 chunk_len
= sizeof(dp
) + data_len
;
683 retval
= sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, chunk_len
);
687 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
688 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
694 /* Create a selective ackowledgement (SACK) for the given
695 * association. This reports on which TSN's we've seen to date,
696 * including duplicates and gaps.
698 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
700 struct sctp_chunk
*retval
;
701 struct sctp_sackhdr sack
;
704 __u16 num_gabs
, num_dup_tsns
;
705 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
707 ctsn
= sctp_tsnmap_get_ctsn(map
);
708 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn
);
710 /* How much room is needed in the chunk? */
711 num_gabs
= sctp_tsnmap_num_gabs(map
);
712 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
714 /* Initialize the SACK header. */
715 sack
.cum_tsn_ack
= htonl(ctsn
);
716 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
717 sack
.num_gap_ack_blocks
= htons(num_gabs
);
718 sack
.num_dup_tsns
= htons(num_dup_tsns
);
721 + sizeof(struct sctp_gap_ack_block
) * num_gabs
722 + sizeof(__u32
) * num_dup_tsns
;
724 /* Create the chunk. */
725 retval
= sctp_make_chunk(asoc
, SCTP_CID_SACK
, 0, len
);
729 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
731 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
732 * HEARTBEAT ACK, etc.) to the same destination transport
733 * address from which it received the DATA or control chunk to
734 * which it is replying. This rule should also be followed if
735 * the endpoint is bundling DATA chunks together with the
738 * However, when acknowledging multiple DATA chunks received
739 * in packets from different source addresses in a single
740 * SACK, the SACK chunk may be transmitted to one of the
741 * destination transport addresses from which the DATA or
742 * control chunks being acknowledged were received.
744 * [BUG: We do not implement the following paragraph.
745 * Perhaps we should remember the last transport we used for a
746 * SACK and avoid that (if possible) if we have seen any
747 * duplicates. --piggy]
749 * When a receiver of a duplicate DATA chunk sends a SACK to a
750 * multi- homed endpoint it MAY be beneficial to vary the
751 * destination address and not use the source address of the
752 * DATA chunk. The reason being that receiving a duplicate
753 * from a multi-homed endpoint might indicate that the return
754 * path (as specified in the source address of the DATA chunk)
755 * for the SACK is broken.
757 * [Send to the address from which we last received a DATA chunk.]
759 retval
->transport
= asoc
->peer
.last_data_from
;
761 retval
->subh
.sack_hdr
=
762 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
764 /* Add the gap ack block information. */
766 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
767 sctp_tsnmap_get_gabs(map
));
769 /* Add the duplicate TSN information. */
771 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
772 sctp_tsnmap_get_dups(map
));
778 /* Make a SHUTDOWN chunk. */
779 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
780 const struct sctp_chunk
*chunk
)
782 struct sctp_chunk
*retval
;
783 sctp_shutdownhdr_t shut
;
786 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
787 shut
.cum_tsn_ack
= htonl(ctsn
);
789 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN
, 0,
790 sizeof(sctp_shutdownhdr_t
));
794 retval
->subh
.shutdown_hdr
=
795 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
798 retval
->transport
= chunk
->transport
;
803 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
804 const struct sctp_chunk
*chunk
)
806 struct sctp_chunk
*retval
;
808 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0);
810 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
812 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
813 * HEARTBEAT ACK, * etc.) to the same destination transport
814 * address from which it * received the DATA or control chunk
815 * to which it is replying.
817 * [ACK back to where the SHUTDOWN came from.]
820 retval
->transport
= chunk
->transport
;
825 struct sctp_chunk
*sctp_make_shutdown_complete(
826 const struct sctp_association
*asoc
,
827 const struct sctp_chunk
*chunk
)
829 struct sctp_chunk
*retval
;
832 /* Set the T-bit if we have no association (vtag will be
835 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
837 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
, 0);
839 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
841 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
842 * HEARTBEAT ACK, * etc.) to the same destination transport
843 * address from which it * received the DATA or control chunk
844 * to which it is replying.
846 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
850 retval
->transport
= chunk
->transport
;
855 /* Create an ABORT. Note that we set the T bit if we have no
856 * association, except when responding to an INIT (sctpimpguide 2.41).
858 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
859 const struct sctp_chunk
*chunk
,
862 struct sctp_chunk
*retval
;
865 /* Set the T-bit if we have no association and 'chunk' is not
866 * an INIT (vtag will be reflected).
869 if (chunk
&& chunk
->chunk_hdr
&&
870 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
873 flags
= SCTP_CHUNK_FLAG_T
;
876 retval
= sctp_make_chunk(asoc
, SCTP_CID_ABORT
, flags
, hint
);
878 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
880 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
881 * HEARTBEAT ACK, * etc.) to the same destination transport
882 * address from which it * received the DATA or control chunk
883 * to which it is replying.
885 * [ABORT back to where the offender came from.]
888 retval
->transport
= chunk
->transport
;
893 /* Helper to create ABORT with a NO_USER_DATA error. */
894 struct sctp_chunk
*sctp_make_abort_no_data(
895 const struct sctp_association
*asoc
,
896 const struct sctp_chunk
*chunk
, __u32 tsn
)
898 struct sctp_chunk
*retval
;
901 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
907 /* Put the tsn back into network byte order. */
908 payload
= htonl(tsn
);
909 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
910 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
912 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
914 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
915 * HEARTBEAT ACK, * etc.) to the same destination transport
916 * address from which it * received the DATA or control chunk
917 * to which it is replying.
919 * [ABORT back to where the offender came from.]
922 retval
->transport
= chunk
->transport
;
928 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
929 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
930 const struct msghdr
*msg
,
933 struct sctp_chunk
*retval
;
934 void *payload
= NULL
;
937 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
942 /* Put the msg_iov together into payload. */
943 payload
= kmalloc(paylen
, GFP_KERNEL
);
947 err
= memcpy_fromiovec(payload
, msg
->msg_iov
, paylen
);
952 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
953 sctp_addto_chunk(retval
, paylen
, payload
);
963 sctp_chunk_free(retval
);
969 /* Append bytes to the end of a parameter. Will panic if chunk is not big
972 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
976 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
978 target
= skb_put(chunk
->skb
, len
);
980 memcpy(target
, data
, len
);
982 /* Adjust the chunk length field. */
983 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
984 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
989 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
990 struct sctp_chunk
*sctp_make_abort_violation(
991 const struct sctp_association
*asoc
,
992 const struct sctp_chunk
*chunk
,
996 struct sctp_chunk
*retval
;
997 struct sctp_paramhdr phdr
;
999 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
1000 + sizeof(sctp_paramhdr_t
));
1004 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
1005 + sizeof(sctp_paramhdr_t
));
1007 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
1008 phdr
.length
= chunk
->chunk_hdr
->length
;
1009 sctp_addto_chunk(retval
, paylen
, payload
);
1010 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
1016 /* Make a HEARTBEAT chunk. */
1017 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
1018 const struct sctp_transport
*transport
,
1019 const void *payload
, const size_t paylen
)
1021 struct sctp_chunk
*retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT
,
1027 /* Cast away the 'const', as this is just telling the chunk
1028 * what transport it belongs to.
1030 retval
->transport
= (struct sctp_transport
*) transport
;
1031 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1037 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
1038 const struct sctp_chunk
*chunk
,
1039 const void *payload
, const size_t paylen
)
1041 struct sctp_chunk
*retval
;
1043 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
);
1047 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1049 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1051 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1052 * HEARTBEAT ACK, * etc.) to the same destination transport
1053 * address from which it * received the DATA or control chunk
1054 * to which it is replying.
1056 * [HBACK back to where the HEARTBEAT came from.]
1059 retval
->transport
= chunk
->transport
;
1065 /* Create an Operation Error chunk with the specified space reserved.
1066 * This routine can be used for containing multiple causes in the chunk.
1068 static struct sctp_chunk
*sctp_make_op_error_space(
1069 const struct sctp_association
*asoc
,
1070 const struct sctp_chunk
*chunk
,
1073 struct sctp_chunk
*retval
;
1075 retval
= sctp_make_chunk(asoc
, SCTP_CID_ERROR
, 0,
1076 sizeof(sctp_errhdr_t
) + size
);
1080 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1082 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1083 * HEARTBEAT ACK, etc.) to the same destination transport
1084 * address from which it received the DATA or control chunk
1085 * to which it is replying.
1089 retval
->transport
= chunk
->transport
;
1095 /* Create an Operation Error chunk. */
1096 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1097 const struct sctp_chunk
*chunk
,
1098 __be16 cause_code
, const void *payload
,
1101 struct sctp_chunk
*retval
;
1103 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
);
1107 sctp_init_cause(retval
, cause_code
, paylen
);
1108 sctp_addto_chunk(retval
, paylen
, payload
);
1114 struct sctp_chunk
*sctp_make_auth(const struct sctp_association
*asoc
)
1116 struct sctp_chunk
*retval
;
1117 struct sctp_hmac
*hmac_desc
;
1118 struct sctp_authhdr auth_hdr
;
1121 /* Get the first hmac that the peer told us to use */
1122 hmac_desc
= sctp_auth_asoc_get_hmac(asoc
);
1123 if (unlikely(!hmac_desc
))
1126 retval
= sctp_make_chunk(asoc
, SCTP_CID_AUTH
, 0,
1127 hmac_desc
->hmac_len
+ sizeof(sctp_authhdr_t
));
1131 auth_hdr
.hmac_id
= htons(hmac_desc
->hmac_id
);
1132 auth_hdr
.shkey_id
= htons(asoc
->active_key_id
);
1134 retval
->subh
.auth_hdr
= sctp_addto_chunk(retval
, sizeof(sctp_authhdr_t
),
1137 hmac
= skb_put(retval
->skb
, hmac_desc
->hmac_len
);
1138 memset(hmac
, 0, hmac_desc
->hmac_len
);
1140 /* Adjust the chunk header to include the empty MAC */
1141 retval
->chunk_hdr
->length
=
1142 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1143 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1149 /********************************************************************
1150 * 2nd Level Abstractions
1151 ********************************************************************/
1153 /* Turn an skb into a chunk.
1154 * FIXME: Eventually move the structure directly inside the skb->cb[].
1156 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1157 const struct sctp_association
*asoc
,
1160 struct sctp_chunk
*retval
;
1162 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, GFP_ATOMIC
);
1168 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb
);
1171 INIT_LIST_HEAD(&retval
->list
);
1173 retval
->asoc
= (struct sctp_association
*)asoc
;
1175 retval
->has_tsn
= 0;
1176 retval
->has_ssn
= 0;
1177 retval
->rtt_in_progress
= 0;
1178 retval
->sent_at
= 0;
1179 retval
->singleton
= 1;
1180 retval
->end_of_packet
= 0;
1181 retval
->ecn_ce_done
= 0;
1182 retval
->pdiscard
= 0;
1184 /* sctpimpguide-05.txt Section 2.8.2
1185 * M1) Each time a new DATA chunk is transmitted
1186 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1187 * 'TSN.Missing.Report' count will be used to determine missing chunks
1188 * and when to fast retransmit.
1190 retval
->tsn_missing_report
= 0;
1191 retval
->tsn_gap_acked
= 0;
1192 retval
->fast_retransmit
= 0;
1194 /* If this is a fragmented message, track all fragments
1195 * of the message (for SEND_FAILED).
1199 /* Polish the bead hole. */
1200 INIT_LIST_HEAD(&retval
->transmitted_list
);
1201 INIT_LIST_HEAD(&retval
->frag_list
);
1202 SCTP_DBG_OBJCNT_INC(chunk
);
1203 atomic_set(&retval
->refcnt
, 1);
1209 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1210 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1211 union sctp_addr
*dest
)
1213 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1214 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1217 /* Extract the source address from a chunk. */
1218 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1220 /* If we have a known transport, use that. */
1221 if (chunk
->transport
) {
1222 return &chunk
->transport
->ipaddr
;
1224 /* Otherwise, extract it from the IP header. */
1225 return &chunk
->source
;
1229 /* Create a new chunk, setting the type and flags headers from the
1230 * arguments, reserving enough space for a 'paylen' byte payload.
1233 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
1234 __u8 type
, __u8 flags
, int paylen
)
1236 struct sctp_chunk
*retval
;
1237 sctp_chunkhdr_t
*chunk_hdr
;
1238 struct sk_buff
*skb
;
1241 /* No need to allocate LL here, as this is only a chunk. */
1242 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
),
1247 /* Make room for the chunk header. */
1248 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1249 chunk_hdr
->type
= type
;
1250 chunk_hdr
->flags
= flags
;
1251 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1253 sk
= asoc
? asoc
->base
.sk
: NULL
;
1254 retval
= sctp_chunkify(skb
, asoc
, sk
);
1260 retval
->chunk_hdr
= chunk_hdr
;
1261 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1263 /* Determine if the chunk needs to be authenticated */
1264 if (sctp_auth_send_cid(type
, asoc
))
1267 /* Set the skb to the belonging sock for accounting. */
1276 /* Release the memory occupied by a chunk. */
1277 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1279 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1280 dev_kfree_skb(chunk
->skb
);
1282 SCTP_DBG_OBJCNT_DEC(chunk
);
1283 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1286 /* Possibly, free the chunk. */
1287 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1289 BUG_ON(!list_empty(&chunk
->list
));
1290 list_del_init(&chunk
->transmitted_list
);
1292 /* Release our reference on the message tracker. */
1294 sctp_datamsg_put(chunk
->msg
);
1296 sctp_chunk_put(chunk
);
1299 /* Grab a reference to the chunk. */
1300 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1302 atomic_inc(&ch
->refcnt
);
1305 /* Release a reference to the chunk. */
1306 void sctp_chunk_put(struct sctp_chunk
*ch
)
1308 if (atomic_dec_and_test(&ch
->refcnt
))
1309 sctp_chunk_destroy(ch
);
1312 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1315 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1319 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1320 int padlen
= WORD_ROUND(chunklen
) - chunklen
;
1322 padding
= skb_put(chunk
->skb
, padlen
);
1323 target
= skb_put(chunk
->skb
, len
);
1325 memset(padding
, 0, padlen
);
1326 memcpy(target
, data
, len
);
1328 /* Adjust the chunk length field. */
1329 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1330 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1335 /* Append bytes from user space to the end of a chunk. Will panic if
1336 * chunk is not big enough.
1337 * Returns a kernel err value.
1339 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int off
, int len
,
1345 /* Make room in chunk for data. */
1346 target
= skb_put(chunk
->skb
, len
);
1348 /* Copy data (whole iovec) into chunk */
1349 if ((err
= memcpy_fromiovecend(target
, data
, off
, len
)))
1352 /* Adjust the chunk length field. */
1353 chunk
->chunk_hdr
->length
=
1354 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1355 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1361 /* Helper function to assign a TSN if needed. This assumes that both
1362 * the data_hdr and association have already been assigned.
1364 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1366 struct sctp_datamsg
*msg
;
1367 struct sctp_chunk
*lchunk
;
1368 struct sctp_stream
*stream
;
1375 /* All fragments will be on the same stream */
1376 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1377 stream
= &chunk
->asoc
->ssnmap
->out
;
1379 /* Now assign the sequence number to the entire message.
1380 * All fragments must have the same stream sequence number.
1383 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1384 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1387 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1388 ssn
= sctp_ssn_next(stream
, sid
);
1390 ssn
= sctp_ssn_peek(stream
, sid
);
1393 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1394 lchunk
->has_ssn
= 1;
1398 /* Helper function to assign a TSN if needed. This assumes that both
1399 * the data_hdr and association have already been assigned.
1401 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1403 if (!chunk
->has_tsn
) {
1404 /* This is the last possible instant to
1407 chunk
->subh
.data_hdr
->tsn
=
1408 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1413 /* Create a CLOSED association to use with an incoming packet. */
1414 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1415 struct sctp_chunk
*chunk
,
1418 struct sctp_association
*asoc
;
1419 struct sk_buff
*skb
;
1423 /* Create the bare association. */
1424 scope
= sctp_scope(sctp_source(chunk
));
1425 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1430 /* Create an entry for the source address of the packet. */
1431 af
= sctp_get_af_specific(ipver2af(ip_hdr(skb
)->version
));
1434 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1439 sctp_association_free(asoc
);
1443 /* Build a cookie representing asoc.
1444 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1446 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1447 const struct sctp_association
*asoc
,
1448 const struct sctp_chunk
*init_chunk
,
1450 const __u8
*raw_addrs
, int addrs_len
)
1452 sctp_cookie_param_t
*retval
;
1453 struct sctp_signed_cookie
*cookie
;
1454 struct scatterlist sg
;
1455 int headersize
, bodysize
;
1456 unsigned int keylen
;
1459 /* Header size is static data prior to the actual cookie, including
1462 headersize
= sizeof(sctp_paramhdr_t
) +
1463 (sizeof(struct sctp_signed_cookie
) -
1464 sizeof(struct sctp_cookie
));
1465 bodysize
= sizeof(struct sctp_cookie
)
1466 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1468 /* Pad out the cookie to a multiple to make the signature
1469 * functions simpler to write.
1471 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1472 bodysize
+= SCTP_COOKIE_MULTIPLE
1473 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1474 *cookie_len
= headersize
+ bodysize
;
1476 /* Clear this memory since we are sending this data structure
1477 * out on the network.
1479 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1483 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1485 /* Set up the parameter header. */
1486 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1487 retval
->p
.length
= htons(*cookie_len
);
1489 /* Copy the cookie part of the association itself. */
1490 cookie
->c
= asoc
->c
;
1491 /* Save the raw address list length in the cookie. */
1492 cookie
->c
.raw_addr_list_len
= addrs_len
;
1494 /* Remember PR-SCTP capability. */
1495 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1497 /* Save adaptation indication in the cookie. */
1498 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1500 /* Set an expiration time for the cookie. */
1501 do_gettimeofday(&cookie
->c
.expiration
);
1502 TIMEVAL_ADD(asoc
->cookie_life
, cookie
->c
.expiration
);
1504 /* Copy the peer's init packet. */
1505 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1506 ntohs(init_chunk
->chunk_hdr
->length
));
1508 /* Copy the raw local address list of the association. */
1509 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1510 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1512 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1513 struct hash_desc desc
;
1515 /* Sign the message. */
1516 sg_init_table(&sg
, 1);
1517 sg_set_page(&sg
, virt_to_page(&cookie
->c
));
1518 sg
.offset
= (unsigned long)(&cookie
->c
) % PAGE_SIZE
;
1519 sg
.length
= bodysize
;
1520 keylen
= SCTP_SECRET_SIZE
;
1521 key
= (char *)ep
->secret_key
[ep
->current_key
];
1522 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1525 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1526 crypto_hash_digest(&desc
, &sg
, bodysize
, cookie
->signature
))
1539 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1540 struct sctp_association
*sctp_unpack_cookie(
1541 const struct sctp_endpoint
*ep
,
1542 const struct sctp_association
*asoc
,
1543 struct sctp_chunk
*chunk
, gfp_t gfp
,
1544 int *error
, struct sctp_chunk
**errp
)
1546 struct sctp_association
*retval
= NULL
;
1547 struct sctp_signed_cookie
*cookie
;
1548 struct sctp_cookie
*bear_cookie
;
1549 int headersize
, bodysize
, fixed_size
;
1550 __u8
*digest
= ep
->digest
;
1551 struct scatterlist sg
;
1552 unsigned int keylen
, len
;
1555 struct sk_buff
*skb
= chunk
->skb
;
1557 struct hash_desc desc
;
1559 /* Header size is static data prior to the actual cookie, including
1562 headersize
= sizeof(sctp_chunkhdr_t
) +
1563 (sizeof(struct sctp_signed_cookie
) -
1564 sizeof(struct sctp_cookie
));
1565 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1566 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1568 /* Verify that the chunk looks like it even has a cookie.
1569 * There must be enough room for our cookie and our peer's
1572 len
= ntohs(chunk
->chunk_hdr
->length
);
1573 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1576 /* Verify that the cookie has been padded out. */
1577 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1580 /* Process the cookie. */
1581 cookie
= chunk
->subh
.cookie_hdr
;
1582 bear_cookie
= &cookie
->c
;
1584 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1587 /* Check the signature. */
1588 keylen
= SCTP_SECRET_SIZE
;
1589 sg_init_table(&sg
, 1);
1590 sg_set_page(&sg
, virt_to_page(bear_cookie
));
1591 sg
.offset
= (unsigned long)(bear_cookie
) % PAGE_SIZE
;
1592 sg
.length
= bodysize
;
1593 key
= (char *)ep
->secret_key
[ep
->current_key
];
1594 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1597 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1598 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1599 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1600 *error
= -SCTP_IERROR_NOMEM
;
1604 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1605 /* Try the previous key. */
1606 key
= (char *)ep
->secret_key
[ep
->last_key
];
1607 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1608 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1609 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1610 *error
= -SCTP_IERROR_NOMEM
;
1614 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1615 /* Yikes! Still bad signature! */
1616 *error
= -SCTP_IERROR_BAD_SIG
;
1622 /* IG Section 2.35.2:
1623 * 3) Compare the port numbers and the verification tag contained
1624 * within the COOKIE ECHO chunk to the actual port numbers and the
1625 * verification tag within the SCTP common header of the received
1626 * packet. If these values do not match the packet MUST be silently
1629 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1630 *error
= -SCTP_IERROR_BAD_TAG
;
1634 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1635 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1636 *error
= -SCTP_IERROR_BAD_PORTS
;
1640 /* Check to see if the cookie is stale. If there is already
1641 * an association, there is no need to check cookie's expiration
1642 * for init collision case of lost COOKIE ACK.
1643 * If skb has been timestamped, then use the stamp, otherwise
1644 * use current time. This introduces a small possibility that
1645 * that a cookie may be considered expired, but his would only slow
1646 * down the new association establishment instead of every packet.
1648 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1649 skb_get_timestamp(skb
, &tv
);
1651 do_gettimeofday(&tv
);
1653 if (!asoc
&& tv_lt(bear_cookie
->expiration
, tv
)) {
1655 * Section 3.3.10.3 Stale Cookie Error (3)
1659 * Stale Cookie Error: Indicates the receipt of a valid State
1660 * Cookie that has expired.
1662 len
= ntohs(chunk
->chunk_hdr
->length
);
1663 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1665 suseconds_t usecs
= (tv
.tv_sec
-
1666 bear_cookie
->expiration
.tv_sec
) * 1000000L +
1667 tv
.tv_usec
- bear_cookie
->expiration
.tv_usec
;
1668 __be32 n
= htonl(usecs
);
1670 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1672 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1673 *error
= -SCTP_IERROR_STALE_COOKIE
;
1675 *error
= -SCTP_IERROR_NOMEM
;
1680 /* Make a new base association. */
1681 scope
= sctp_scope(sctp_source(chunk
));
1682 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1684 *error
= -SCTP_IERROR_NOMEM
;
1688 /* Set up our peer's port number. */
1689 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1691 /* Populate the association from the cookie. */
1692 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1694 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1696 *error
= -SCTP_IERROR_NOMEM
;
1700 /* Also, add the destination address. */
1701 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1702 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
, 1,
1706 retval
->next_tsn
= retval
->c
.initial_tsn
;
1707 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1708 retval
->addip_serial
= retval
->c
.initial_tsn
;
1709 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1710 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1711 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1713 /* The INIT stuff will be done by the side effects. */
1718 sctp_association_free(retval
);
1723 /* Yikes! The packet is either corrupt or deliberately
1726 *error
= -SCTP_IERROR_MALFORMED
;
1730 /********************************************************************
1731 * 3rd Level Abstractions
1732 ********************************************************************/
1734 struct __sctp_missing
{
1737 } __attribute__((packed
));
1740 * Report a missing mandatory parameter.
1742 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1743 sctp_param_t paramtype
,
1744 struct sctp_chunk
*chunk
,
1745 struct sctp_chunk
**errp
)
1747 struct __sctp_missing report
;
1750 len
= WORD_ROUND(sizeof(report
));
1752 /* Make an ERROR chunk, preparing enough room for
1753 * returning multiple unknown parameters.
1756 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1759 report
.num_missing
= htonl(1);
1760 report
.type
= paramtype
;
1761 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1763 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1766 /* Stop processing this chunk. */
1770 /* Report an Invalid Mandatory Parameter. */
1771 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1772 struct sctp_chunk
*chunk
,
1773 struct sctp_chunk
**errp
)
1775 /* Invalid Mandatory Parameter Error has no payload. */
1778 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1781 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1783 /* Stop processing this chunk. */
1787 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1788 struct sctp_paramhdr
*param
,
1789 const struct sctp_chunk
*chunk
,
1790 struct sctp_chunk
**errp
)
1792 char error
[] = "The following parameter had invalid length:";
1793 size_t payload_len
= WORD_ROUND(sizeof(error
)) +
1794 sizeof(sctp_paramhdr_t
);
1797 /* Create an error chunk and fill it in with our payload. */
1799 *errp
= sctp_make_op_error_space(asoc
, chunk
, payload_len
);
1802 sctp_init_cause(*errp
, SCTP_ERROR_PROTO_VIOLATION
,
1803 sizeof(error
) + sizeof(sctp_paramhdr_t
));
1804 sctp_addto_chunk(*errp
, sizeof(error
), error
);
1805 sctp_addto_param(*errp
, sizeof(sctp_paramhdr_t
), param
);
1812 /* Do not attempt to handle the HOST_NAME parm. However, do
1813 * send back an indicator to the peer.
1815 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1816 union sctp_params param
,
1817 struct sctp_chunk
*chunk
,
1818 struct sctp_chunk
**errp
)
1820 __u16 len
= ntohs(param
.p
->length
);
1822 /* Make an ERROR chunk. */
1824 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1827 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1828 sctp_addto_chunk(*errp
, len
, param
.v
);
1831 /* Stop processing this chunk. */
1835 static void sctp_process_ext_param(struct sctp_association
*asoc
,
1836 union sctp_params param
)
1838 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1841 for (i
= 0; i
< num_ext
; i
++) {
1842 switch (param
.ext
->chunks
[i
]) {
1843 case SCTP_CID_FWD_TSN
:
1844 if (sctp_prsctp_enable
&&
1845 !asoc
->peer
.prsctp_capable
)
1846 asoc
->peer
.prsctp_capable
= 1;
1849 /* if the peer reports AUTH, assume that he
1852 asoc
->peer
.auth_capable
= 1;
1854 case SCTP_CID_ASCONF
:
1855 case SCTP_CID_ASCONF_ACK
:
1856 asoc
->peer
.addip_capable
= 1;
1864 /* RFC 3.2.1 & the Implementers Guide 2.2.
1866 * The Parameter Types are encoded such that the
1867 * highest-order two bits specify the action that must be
1868 * taken if the processing endpoint does not recognize the
1871 * 00 - Stop processing this SCTP chunk and discard it,
1872 * do not process any further chunks within it.
1874 * 01 - Stop processing this SCTP chunk and discard it,
1875 * do not process any further chunks within it, and report
1876 * the unrecognized parameter in an 'Unrecognized
1877 * Parameter Type' (in either an ERROR or in the INIT ACK).
1879 * 10 - Skip this parameter and continue processing.
1881 * 11 - Skip this parameter and continue processing but
1882 * report the unrecognized parameter in an
1883 * 'Unrecognized Parameter Type' (in either an ERROR or in
1887 * 0 - discard the chunk
1888 * 1 - continue with the chunk
1890 static int sctp_process_unk_param(const struct sctp_association
*asoc
,
1891 union sctp_params param
,
1892 struct sctp_chunk
*chunk
,
1893 struct sctp_chunk
**errp
)
1897 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
1898 case SCTP_PARAM_ACTION_DISCARD
:
1901 case SCTP_PARAM_ACTION_DISCARD_ERR
:
1903 /* Make an ERROR chunk, preparing enough room for
1904 * returning multiple unknown parameters.
1907 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1908 ntohs(chunk
->chunk_hdr
->length
));
1911 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1912 WORD_ROUND(ntohs(param
.p
->length
)));
1913 sctp_addto_chunk(*errp
,
1914 WORD_ROUND(ntohs(param
.p
->length
)),
1919 case SCTP_PARAM_ACTION_SKIP
:
1921 case SCTP_PARAM_ACTION_SKIP_ERR
:
1922 /* Make an ERROR chunk, preparing enough room for
1923 * returning multiple unknown parameters.
1926 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1927 ntohs(chunk
->chunk_hdr
->length
));
1930 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1931 WORD_ROUND(ntohs(param
.p
->length
)));
1932 sctp_addto_chunk(*errp
,
1933 WORD_ROUND(ntohs(param
.p
->length
)),
1936 /* If there is no memory for generating the ERROR
1937 * report as specified, an ABORT will be triggered
1938 * to the peer and the association won't be
1952 /* Find unrecognized parameters in the chunk.
1954 * 0 - discard the chunk
1955 * 1 - continue with the chunk
1957 static int sctp_verify_param(const struct sctp_association
*asoc
,
1958 union sctp_params param
,
1960 struct sctp_chunk
*chunk
,
1961 struct sctp_chunk
**err_chunk
)
1965 /* FIXME - This routine is not looking at each parameter per the
1966 * chunk type, i.e., unrecognized parameters should be further
1967 * identified based on the chunk id.
1970 switch (param
.p
->type
) {
1971 case SCTP_PARAM_IPV4_ADDRESS
:
1972 case SCTP_PARAM_IPV6_ADDRESS
:
1973 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
1974 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
1975 case SCTP_PARAM_STATE_COOKIE
:
1976 case SCTP_PARAM_HEARTBEAT_INFO
:
1977 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
1978 case SCTP_PARAM_ECN_CAPABLE
:
1979 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
1980 case SCTP_PARAM_SUPPORTED_EXT
:
1983 case SCTP_PARAM_HOST_NAME_ADDRESS
:
1984 /* Tell the peer, we won't support this param. */
1985 return sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
1987 case SCTP_PARAM_FWD_TSN_SUPPORT
:
1988 if (sctp_prsctp_enable
)
1992 case SCTP_PARAM_RANDOM
:
1993 if (!sctp_auth_enable
)
1996 /* SCTP-AUTH: Secion 6.1
1997 * If the random number is not 32 byte long the association
1998 * MUST be aborted. The ABORT chunk SHOULD contain the error
1999 * cause 'Protocol Violation'.
2001 if (SCTP_AUTH_RANDOM_LENGTH
!=
2002 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
))
2003 return sctp_process_inv_paramlength(asoc
, param
.p
,
2007 case SCTP_PARAM_CHUNKS
:
2008 if (!sctp_auth_enable
)
2011 /* SCTP-AUTH: Section 3.2
2012 * The CHUNKS parameter MUST be included once in the INIT or
2013 * INIT-ACK chunk if the sender wants to receive authenticated
2014 * chunks. Its maximum length is 260 bytes.
2016 if (260 < ntohs(param
.p
->length
))
2017 return sctp_process_inv_paramlength(asoc
, param
.p
,
2021 case SCTP_PARAM_HMAC_ALGO
:
2022 if (!sctp_auth_enable
)
2027 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2028 ntohs(param
.p
->type
), cid
);
2029 return sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2036 /* Verify the INIT packet before we process it. */
2037 int sctp_verify_init(const struct sctp_association
*asoc
,
2039 sctp_init_chunk_t
*peer_init
,
2040 struct sctp_chunk
*chunk
,
2041 struct sctp_chunk
**errp
)
2043 union sctp_params param
;
2046 /* Verify stream values are non-zero. */
2047 if ((0 == peer_init
->init_hdr
.num_outbound_streams
) ||
2048 (0 == peer_init
->init_hdr
.num_inbound_streams
) ||
2049 (0 == peer_init
->init_hdr
.init_tag
) ||
2050 (SCTP_DEFAULT_MINWINDOW
> ntohl(peer_init
->init_hdr
.a_rwnd
))) {
2052 sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2056 /* Check for missing mandatory parameters. */
2057 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2059 if (SCTP_PARAM_STATE_COOKIE
== param
.p
->type
)
2062 } /* for (loop through all parameters) */
2064 /* There is a possibility that a parameter length was bad and
2065 * in that case we would have stoped walking the parameters.
2066 * The current param.p would point at the bad one.
2067 * Current consensus on the mailing list is to generate a PROTOCOL
2068 * VIOLATION error. We build the ERROR chunk here and let the normal
2069 * error handling code build and send the packet.
2071 if (param
.v
!= (void*)chunk
->chunk_end
) {
2072 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2076 /* The only missing mandatory param possible today is
2077 * the state cookie for an INIT-ACK chunk.
2079 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
) {
2080 sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2085 /* Find unrecognized parameters. */
2087 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2089 if (!sctp_verify_param(asoc
, param
, cid
, chunk
, errp
)) {
2090 if (SCTP_PARAM_HOST_NAME_ADDRESS
== param
.p
->type
)
2096 } /* for (loop through all parameters) */
2101 /* Unpack the parameters in an INIT packet into an association.
2102 * Returns 0 on failure, else success.
2103 * FIXME: This is an association method.
2105 int sctp_process_init(struct sctp_association
*asoc
, sctp_cid_t cid
,
2106 const union sctp_addr
*peer_addr
,
2107 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
2109 union sctp_params param
;
2110 struct sctp_transport
*transport
;
2111 struct list_head
*pos
, *temp
;
2114 /* We must include the address that the INIT packet came from.
2115 * This is the only address that matters for an INIT packet.
2116 * When processing a COOKIE ECHO, we retrieve the from address
2117 * of the INIT from the cookie.
2120 /* This implementation defaults to making the first transport
2121 * added as the primary transport. The source address seems to
2122 * be a a better choice than any of the embedded addresses.
2125 if(!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2129 /* Process the initialization parameters. */
2130 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2132 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2136 /* AUTH: After processing the parameters, make sure that we
2137 * have all the required info to potentially do authentications.
2139 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2140 !asoc
->peer
.peer_hmacs
))
2141 asoc
->peer
.auth_capable
= 0;
2144 /* If the peer claims support for ADD-IP without support
2145 * for AUTH, disable support for ADD-IP.
2147 if (asoc
->peer
.addip_capable
&& !asoc
->peer
.auth_capable
) {
2148 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2150 SCTP_PARAM_SET_PRIMARY
);
2153 /* Walk list of transports, removing transports in the UNKNOWN state. */
2154 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2155 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2156 if (transport
->state
== SCTP_UNKNOWN
) {
2157 sctp_assoc_rm_peer(asoc
, transport
);
2161 /* The fixed INIT headers are always in network byte
2164 asoc
->peer
.i
.init_tag
=
2165 ntohl(peer_init
->init_hdr
.init_tag
);
2166 asoc
->peer
.i
.a_rwnd
=
2167 ntohl(peer_init
->init_hdr
.a_rwnd
);
2168 asoc
->peer
.i
.num_outbound_streams
=
2169 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2170 asoc
->peer
.i
.num_inbound_streams
=
2171 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2172 asoc
->peer
.i
.initial_tsn
=
2173 ntohl(peer_init
->init_hdr
.initial_tsn
);
2175 /* Apply the upper bounds for output streams based on peer's
2176 * number of inbound streams.
2178 if (asoc
->c
.sinit_num_ostreams
>
2179 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2180 asoc
->c
.sinit_num_ostreams
=
2181 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2184 if (asoc
->c
.sinit_max_instreams
>
2185 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2186 asoc
->c
.sinit_max_instreams
=
2187 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2190 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2191 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2193 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2194 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2196 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2197 cookie
= asoc
->peer
.cookie
;
2199 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2200 if (!asoc
->peer
.cookie
)
2204 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2205 * high (for example, implementations MAY use the size of the receiver
2206 * advertised window).
2208 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2209 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2210 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2213 /* Set up the TSN tracking pieces. */
2214 sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_SIZE
,
2215 asoc
->peer
.i
.initial_tsn
);
2217 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2219 * The stream sequence number in all the streams shall start
2220 * from 0 when the association is established. Also, when the
2221 * stream sequence number reaches the value 65535 the next
2222 * stream sequence number shall be set to 0.
2225 /* Allocate storage for the negotiated streams if it is not a temporary
2231 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
2232 asoc
->c
.sinit_num_ostreams
, gfp
);
2236 error
= sctp_assoc_set_id(asoc
, gfp
);
2241 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2243 * When an endpoint has an ASCONF signaled change to be sent to the
2244 * remote endpoint it should do the following:
2246 * A2) A serial number should be assigned to the Chunk. The serial
2247 * number should be a monotonically increasing number. All serial
2248 * numbers are defined to be initialized at the start of the
2249 * association to the same value as the Initial TSN.
2251 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2255 /* Release the transport structures. */
2256 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2257 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2259 sctp_transport_free(transport
);
2262 asoc
->peer
.transport_count
= 0;
2269 /* Update asoc with the option described in param.
2271 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2273 * asoc is the association to update.
2274 * param is the variable length parameter to use for update.
2275 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2276 * If the current packet is an INIT we want to minimize the amount of
2277 * work we do. In particular, we should not build transport
2278 * structures for the addresses.
2280 static int sctp_process_param(struct sctp_association
*asoc
,
2281 union sctp_params param
,
2282 const union sctp_addr
*peer_addr
,
2285 union sctp_addr addr
;
2293 /* We maintain all INIT parameters in network byte order all the
2294 * time. This allows us to not worry about whether the parameters
2295 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2297 switch (param
.p
->type
) {
2298 case SCTP_PARAM_IPV6_ADDRESS
:
2299 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2302 case SCTP_PARAM_IPV4_ADDRESS
:
2303 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2304 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2305 scope
= sctp_scope(peer_addr
);
2306 if (sctp_in_scope(&addr
, scope
))
2307 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2311 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2312 if (!sctp_cookie_preserve_enable
)
2315 stale
= ntohl(param
.life
->lifespan_increment
);
2317 /* Suggested Cookie Life span increment's unit is msec,
2320 asoc
->cookie_life
.tv_sec
+= stale
/ 1000;
2321 asoc
->cookie_life
.tv_usec
+= (stale
% 1000) * 1000;
2324 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2325 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2328 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2329 /* Turn off the default values first so we'll know which
2330 * ones are really set by the peer.
2332 asoc
->peer
.ipv4_address
= 0;
2333 asoc
->peer
.ipv6_address
= 0;
2335 /* Cycle through address types; avoid divide by 0. */
2336 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2338 sat
/= sizeof(__u16
);
2340 for (i
= 0; i
< sat
; ++i
) {
2341 switch (param
.sat
->types
[i
]) {
2342 case SCTP_PARAM_IPV4_ADDRESS
:
2343 asoc
->peer
.ipv4_address
= 1;
2346 case SCTP_PARAM_IPV6_ADDRESS
:
2347 asoc
->peer
.ipv6_address
= 1;
2350 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2351 asoc
->peer
.hostname_address
= 1;
2354 default: /* Just ignore anything else. */
2360 case SCTP_PARAM_STATE_COOKIE
:
2361 asoc
->peer
.cookie_len
=
2362 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2363 asoc
->peer
.cookie
= param
.cookie
->body
;
2366 case SCTP_PARAM_HEARTBEAT_INFO
:
2367 /* Would be odd to receive, but it causes no problems. */
2370 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2371 /* Rejected during verify stage. */
2374 case SCTP_PARAM_ECN_CAPABLE
:
2375 asoc
->peer
.ecn_capable
= 1;
2378 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2379 asoc
->peer
.adaptation_ind
= param
.aind
->adaptation_ind
;
2382 case SCTP_PARAM_SUPPORTED_EXT
:
2383 sctp_process_ext_param(asoc
, param
);
2386 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2387 if (sctp_prsctp_enable
) {
2388 asoc
->peer
.prsctp_capable
= 1;
2394 case SCTP_PARAM_RANDOM
:
2395 if (!sctp_auth_enable
)
2398 /* Save peer's random parameter */
2399 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2400 ntohs(param
.p
->length
), gfp
);
2401 if (!asoc
->peer
.peer_random
) {
2407 case SCTP_PARAM_HMAC_ALGO
:
2408 if (!sctp_auth_enable
)
2411 /* Save peer's HMAC list */
2412 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2413 ntohs(param
.p
->length
), gfp
);
2414 if (!asoc
->peer
.peer_hmacs
) {
2419 /* Set the default HMAC the peer requested*/
2420 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2423 case SCTP_PARAM_CHUNKS
:
2424 if (!sctp_auth_enable
)
2427 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2428 ntohs(param
.p
->length
), gfp
);
2429 if (!asoc
->peer
.peer_chunks
)
2434 /* Any unrecognized parameters should have been caught
2435 * and handled by sctp_verify_param() which should be
2436 * called prior to this routine. Simply log the error
2439 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2440 ntohs(param
.p
->type
), asoc
);
2447 /* Select a new verification tag. */
2448 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2450 /* I believe that this random number generator complies with RFC1750.
2451 * A tag of 0 is reserved for special cases (e.g. INIT).
2456 get_random_bytes(&x
, sizeof(__u32
));
2462 /* Select an initial TSN to send during startup. */
2463 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2467 get_random_bytes(&retval
, sizeof(__u32
));
2472 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2474 * 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
2475 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2476 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2477 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2479 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2480 * | Address Parameter |
2481 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2482 * | ASCONF Parameter #1 |
2483 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2487 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2488 * | ASCONF Parameter #N |
2489 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2491 * Address Parameter and other parameter will not be wrapped in this function
2493 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2494 union sctp_addr
*addr
,
2497 sctp_addiphdr_t asconf
;
2498 struct sctp_chunk
*retval
;
2499 int length
= sizeof(asconf
) + vparam_len
;
2500 union sctp_addr_param addrparam
;
2502 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2504 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2509 /* Create the chunk. */
2510 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF
, 0, length
);
2514 asconf
.serial
= htonl(asoc
->addip_serial
++);
2516 retval
->subh
.addip_hdr
=
2517 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2518 retval
->param_hdr
.v
=
2519 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2525 * 3.2.1 Add IP Address
2527 * 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
2528 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2529 * | Type = 0xC001 | Length = Variable |
2530 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2531 * | ASCONF-Request Correlation ID |
2532 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2533 * | Address Parameter |
2534 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2536 * 3.2.2 Delete IP Address
2538 * 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
2539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2540 * | Type = 0xC002 | Length = Variable |
2541 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2542 * | ASCONF-Request Correlation ID |
2543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2544 * | Address Parameter |
2545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2548 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2549 union sctp_addr
*laddr
,
2550 struct sockaddr
*addrs
,
2554 sctp_addip_param_t param
;
2555 struct sctp_chunk
*retval
;
2556 union sctp_addr_param addr_param
;
2557 union sctp_addr
*addr
;
2560 int paramlen
= sizeof(param
);
2561 int addr_param_len
= 0;
2565 /* Get total length of all the address parameters. */
2567 for (i
= 0; i
< addrcnt
; i
++) {
2568 addr
= (union sctp_addr
*)addr_buf
;
2569 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2570 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2572 totallen
+= paramlen
;
2573 totallen
+= addr_param_len
;
2575 addr_buf
+= af
->sockaddr_len
;
2578 /* Create an asconf chunk with the required length. */
2579 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2583 /* Add the address parameters to the asconf chunk. */
2585 for (i
= 0; i
< addrcnt
; i
++) {
2586 addr
= (union sctp_addr
*)addr_buf
;
2587 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2588 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2589 param
.param_hdr
.type
= flags
;
2590 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2593 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2594 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2596 addr_buf
+= af
->sockaddr_len
;
2602 * 3.2.4 Set Primary IP Address
2604 * 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
2605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2606 * | Type =0xC004 | Length = Variable |
2607 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2608 * | ASCONF-Request Correlation ID |
2609 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2610 * | Address Parameter |
2611 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2613 * Create an ASCONF chunk with Set Primary IP address parameter.
2615 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2616 union sctp_addr
*addr
)
2618 sctp_addip_param_t param
;
2619 struct sctp_chunk
*retval
;
2620 int len
= sizeof(param
);
2621 union sctp_addr_param addrparam
;
2623 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2625 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2630 /* Create the chunk and make asconf header. */
2631 retval
= sctp_make_asconf(asoc
, addr
, len
);
2635 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2636 param
.param_hdr
.length
= htons(len
);
2639 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2640 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2645 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2647 * 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
2648 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2649 * | Type = 0x80 | Chunk Flags | Chunk Length |
2650 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2652 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2653 * | ASCONF Parameter Response#1 |
2654 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2659 * | ASCONF Parameter Response#N |
2660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2662 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2664 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2665 __u32 serial
, int vparam_len
)
2667 sctp_addiphdr_t asconf
;
2668 struct sctp_chunk
*retval
;
2669 int length
= sizeof(asconf
) + vparam_len
;
2671 /* Create the chunk. */
2672 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
);
2676 asconf
.serial
= htonl(serial
);
2678 retval
->subh
.addip_hdr
=
2679 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2684 /* Add response parameters to an ASCONF_ACK chunk. */
2685 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2686 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2688 sctp_addip_param_t ack_param
;
2689 sctp_errhdr_t err_param
;
2690 int asconf_param_len
= 0;
2691 int err_param_len
= 0;
2692 __be16 response_type
;
2694 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2695 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2697 response_type
= SCTP_PARAM_ERR_CAUSE
;
2698 err_param_len
= sizeof(err_param
);
2701 ntohs(asconf_param
->param_hdr
.length
);
2704 /* Add Success Indication or Error Cause Indication parameter. */
2705 ack_param
.param_hdr
.type
= response_type
;
2706 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2709 ack_param
.crr_id
= crr_id
;
2710 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2712 if (SCTP_ERROR_NO_ERROR
== err_code
)
2715 /* Add Error Cause parameter. */
2716 err_param
.cause
= err_code
;
2717 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2718 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2720 /* Add the failed TLV copied from ASCONF chunk. */
2722 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
2725 /* Process a asconf parameter. */
2726 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
2727 struct sctp_chunk
*asconf
,
2728 sctp_addip_param_t
*asconf_param
)
2730 struct sctp_transport
*peer
;
2732 union sctp_addr addr
;
2733 struct list_head
*pos
;
2734 union sctp_addr_param
*addr_param
;
2736 addr_param
= (union sctp_addr_param
*)
2737 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2739 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2741 return SCTP_ERROR_INV_PARAM
;
2743 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
2744 switch (asconf_param
->param_hdr
.type
) {
2745 case SCTP_PARAM_ADD_IP
:
2746 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
2747 * request and does not have the local resources to add this
2748 * new address to the association, it MUST return an Error
2749 * Cause TLV set to the new error code 'Operation Refused
2750 * Due to Resource Shortage'.
2753 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
2755 return SCTP_ERROR_RSRC_LOW
;
2757 /* Start the heartbeat timer. */
2758 if (!mod_timer(&peer
->hb_timer
, sctp_transport_timeout(peer
)))
2759 sctp_transport_hold(peer
);
2761 case SCTP_PARAM_DEL_IP
:
2762 /* ADDIP 4.3 D7) If a request is received to delete the
2763 * last remaining IP address of a peer endpoint, the receiver
2764 * MUST send an Error Cause TLV with the error cause set to the
2765 * new error code 'Request to Delete Last Remaining IP Address'.
2767 pos
= asoc
->peer
.transport_addr_list
.next
;
2768 if (pos
->next
== &asoc
->peer
.transport_addr_list
)
2769 return SCTP_ERROR_DEL_LAST_IP
;
2771 /* ADDIP 4.3 D8) If a request is received to delete an IP
2772 * address which is also the source address of the IP packet
2773 * which contained the ASCONF chunk, the receiver MUST reject
2774 * this request. To reject the request the receiver MUST send
2775 * an Error Cause TLV set to the new error code 'Request to
2776 * Delete Source IP Address'
2778 if (sctp_cmp_addr_exact(sctp_source(asconf
), &addr
))
2779 return SCTP_ERROR_DEL_SRC_IP
;
2781 sctp_assoc_del_peer(asoc
, &addr
);
2783 case SCTP_PARAM_SET_PRIMARY
:
2784 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2786 return SCTP_ERROR_INV_PARAM
;
2788 sctp_assoc_set_primary(asoc
, peer
);
2791 return SCTP_ERROR_INV_PARAM
;
2795 return SCTP_ERROR_NO_ERROR
;
2798 /* Verify the ASCONF packet before we process it. */
2799 int sctp_verify_asconf(const struct sctp_association
*asoc
,
2800 struct sctp_paramhdr
*param_hdr
, void *chunk_end
,
2801 struct sctp_paramhdr
**errp
) {
2802 sctp_addip_param_t
*asconf_param
;
2803 union sctp_params param
;
2806 param
.v
= (sctp_paramhdr_t
*) param_hdr
;
2807 while (param
.v
<= chunk_end
- sizeof(sctp_paramhdr_t
)) {
2808 length
= ntohs(param
.p
->length
);
2811 if (param
.v
> chunk_end
- length
||
2812 length
< sizeof(sctp_paramhdr_t
))
2815 switch (param
.p
->type
) {
2816 case SCTP_PARAM_ADD_IP
:
2817 case SCTP_PARAM_DEL_IP
:
2818 case SCTP_PARAM_SET_PRIMARY
:
2819 asconf_param
= (sctp_addip_param_t
*)param
.v
;
2820 plen
= ntohs(asconf_param
->param_hdr
.length
);
2821 if (plen
< sizeof(sctp_addip_param_t
) +
2822 sizeof(sctp_paramhdr_t
))
2825 case SCTP_PARAM_SUCCESS_REPORT
:
2826 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2827 if (length
!= sizeof(sctp_addip_param_t
))
2835 param
.v
+= WORD_ROUND(length
);
2838 if (param
.v
!= chunk_end
)
2844 /* Process an incoming ASCONF chunk with the next expected serial no. and
2845 * return an ASCONF_ACK chunk to be sent in response.
2847 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
2848 struct sctp_chunk
*asconf
)
2850 sctp_addiphdr_t
*hdr
;
2851 union sctp_addr_param
*addr_param
;
2852 sctp_addip_param_t
*asconf_param
;
2853 struct sctp_chunk
*asconf_ack
;
2857 int chunk_len
= asconf
->skb
->len
;
2859 int all_param_pass
= 1;
2861 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
2862 serial
= ntohl(hdr
->serial
);
2864 /* Skip the addiphdr and store a pointer to address parameter. */
2865 length
= sizeof(sctp_addiphdr_t
);
2866 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
2867 chunk_len
-= length
;
2869 /* Skip the address parameter and store a pointer to the first
2872 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
2873 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
2874 chunk_len
-= length
;
2876 /* create an ASCONF_ACK chunk.
2877 * Based on the definitions of parameters, we know that the size of
2878 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
2881 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 2);
2885 /* Process the TLVs contained within the ASCONF chunk. */
2886 while (chunk_len
> 0) {
2887 err_code
= sctp_process_asconf_param(asoc
, asconf
,
2890 * If an error response is received for a TLV parameter,
2891 * all TLVs with no response before the failed TLV are
2892 * considered successful if not reported. All TLVs after
2893 * the failed response are considered unsuccessful unless
2894 * a specific success indication is present for the parameter.
2896 if (SCTP_ERROR_NO_ERROR
!= err_code
)
2899 if (!all_param_pass
)
2900 sctp_add_asconf_response(asconf_ack
,
2901 asconf_param
->crr_id
, err_code
,
2904 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
2905 * an IP address sends an 'Out of Resource' in its response, it
2906 * MUST also fail any subsequent add or delete requests bundled
2909 if (SCTP_ERROR_RSRC_LOW
== err_code
)
2912 /* Move to the next ASCONF param. */
2913 length
= ntohs(asconf_param
->param_hdr
.length
);
2914 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
2916 chunk_len
-= length
;
2920 asoc
->peer
.addip_serial
++;
2922 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
2923 * after freeing the reference to old asconf ack if any.
2926 if (asoc
->addip_last_asconf_ack
)
2927 sctp_chunk_free(asoc
->addip_last_asconf_ack
);
2929 sctp_chunk_hold(asconf_ack
);
2930 asoc
->addip_last_asconf_ack
= asconf_ack
;
2936 /* Process a asconf parameter that is successfully acked. */
2937 static int sctp_asconf_param_success(struct sctp_association
*asoc
,
2938 sctp_addip_param_t
*asconf_param
)
2941 union sctp_addr addr
;
2942 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
2943 union sctp_addr_param
*addr_param
;
2944 struct list_head
*pos
;
2945 struct sctp_transport
*transport
;
2946 struct sctp_sockaddr_entry
*saddr
;
2949 addr_param
= (union sctp_addr_param
*)
2950 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2952 /* We have checked the packet before, so we do not check again. */
2953 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2954 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
2956 switch (asconf_param
->param_hdr
.type
) {
2957 case SCTP_PARAM_ADD_IP
:
2958 /* This is always done in BH context with a socket lock
2959 * held, so the list can not change.
2961 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
2962 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
2963 saddr
->use_as_src
= 1;
2966 case SCTP_PARAM_DEL_IP
:
2967 retval
= sctp_del_bind_addr(bp
, &addr
, call_rcu_bh
);
2968 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2969 transport
= list_entry(pos
, struct sctp_transport
,
2971 dst_release(transport
->dst
);
2972 sctp_transport_route(transport
, NULL
,
2973 sctp_sk(asoc
->base
.sk
));
2983 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
2984 * for the given asconf parameter. If there is no response for this parameter,
2985 * return the error code based on the third argument 'no_err'.
2987 * A7) If an error response is received for a TLV parameter, all TLVs with no
2988 * response before the failed TLV are considered successful if not reported.
2989 * All TLVs after the failed response are considered unsuccessful unless a
2990 * specific success indication is present for the parameter.
2992 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
2993 sctp_addip_param_t
*asconf_param
,
2996 sctp_addip_param_t
*asconf_ack_param
;
2997 sctp_errhdr_t
*err_param
;
2999 int asconf_ack_len
= asconf_ack
->skb
->len
;
3003 err_code
= SCTP_ERROR_NO_ERROR
;
3005 err_code
= SCTP_ERROR_REQ_REFUSED
;
3007 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3008 * the first asconf_ack parameter.
3010 length
= sizeof(sctp_addiphdr_t
);
3011 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
3013 asconf_ack_len
-= length
;
3015 while (asconf_ack_len
> 0) {
3016 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3017 switch(asconf_ack_param
->param_hdr
.type
) {
3018 case SCTP_PARAM_SUCCESS_REPORT
:
3019 return SCTP_ERROR_NO_ERROR
;
3020 case SCTP_PARAM_ERR_CAUSE
:
3021 length
= sizeof(sctp_addip_param_t
);
3022 err_param
= (sctp_errhdr_t
*)
3023 ((void *)asconf_ack_param
+ length
);
3024 asconf_ack_len
-= length
;
3025 if (asconf_ack_len
> 0)
3026 return err_param
->cause
;
3028 return SCTP_ERROR_INV_PARAM
;
3031 return SCTP_ERROR_INV_PARAM
;
3035 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3036 asconf_ack_param
= (sctp_addip_param_t
*)
3037 ((void *)asconf_ack_param
+ length
);
3038 asconf_ack_len
-= length
;
3044 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3045 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3046 struct sctp_chunk
*asconf_ack
)
3048 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3049 union sctp_addr_param
*addr_param
;
3050 sctp_addip_param_t
*asconf_param
;
3052 int asconf_len
= asconf
->skb
->len
;
3053 int all_param_pass
= 0;
3056 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3058 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3059 * a pointer to address parameter.
3061 length
= sizeof(sctp_addip_chunk_t
);
3062 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3063 asconf_len
-= length
;
3065 /* Skip the address parameter in the last asconf sent and store a
3066 * pointer to the first asconf paramter.
3068 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
3069 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
3070 asconf_len
-= length
;
3073 * A8) If there is no response(s) to specific TLV parameter(s), and no
3074 * failures are indicated, then all request(s) are considered
3077 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
3080 /* Process the TLVs contained in the last sent ASCONF chunk. */
3081 while (asconf_len
> 0) {
3083 err_code
= SCTP_ERROR_NO_ERROR
;
3085 err_code
= sctp_get_asconf_response(asconf_ack
,
3088 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3093 case SCTP_ERROR_NO_ERROR
:
3094 retval
= sctp_asconf_param_success(asoc
, asconf_param
);
3097 case SCTP_ERROR_RSRC_LOW
:
3101 case SCTP_ERROR_INV_PARAM
:
3102 /* Disable sending this type of asconf parameter in
3105 asoc
->peer
.addip_disabled_mask
|=
3106 asconf_param
->param_hdr
.type
;
3109 case SCTP_ERROR_REQ_REFUSED
:
3110 case SCTP_ERROR_DEL_LAST_IP
:
3111 case SCTP_ERROR_DEL_SRC_IP
:
3116 /* Skip the processed asconf parameter and move to the next
3119 length
= ntohs(asconf_param
->param_hdr
.length
);
3120 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
3122 asconf_len
-= length
;
3125 /* Free the cached last sent asconf chunk. */
3126 sctp_chunk_free(asconf
);
3127 asoc
->addip_last_asconf
= NULL
;
3129 /* Send the next asconf chunk from the addip chunk queue. */
3130 if (!list_empty(&asoc
->addip_chunk_list
)) {
3131 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
3132 asconf
= list_entry(entry
, struct sctp_chunk
, list
);
3134 list_del_init(entry
);
3136 /* Hold the chunk until an ASCONF_ACK is received. */
3137 sctp_chunk_hold(asconf
);
3138 if (sctp_primitive_ASCONF(asoc
, asconf
))
3139 sctp_chunk_free(asconf
);
3141 asoc
->addip_last_asconf
= asconf
;
3147 /* Make a FWD TSN chunk. */
3148 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3149 __u32 new_cum_tsn
, size_t nstreams
,
3150 struct sctp_fwdtsn_skip
*skiplist
)
3152 struct sctp_chunk
*retval
= NULL
;
3153 struct sctp_fwdtsn_chunk
*ftsn_chunk
;
3154 struct sctp_fwdtsn_hdr ftsn_hdr
;
3155 struct sctp_fwdtsn_skip skip
;
3159 hint
= (nstreams
+ 1) * sizeof(__u32
);
3161 retval
= sctp_make_chunk(asoc
, SCTP_CID_FWD_TSN
, 0, hint
);
3166 ftsn_chunk
= (struct sctp_fwdtsn_chunk
*)retval
->subh
.fwdtsn_hdr
;
3168 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3169 retval
->subh
.fwdtsn_hdr
=
3170 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3172 for (i
= 0; i
< nstreams
; i
++) {
3173 skip
.stream
= skiplist
[i
].stream
;
3174 skip
.ssn
= skiplist
[i
].ssn
;
3175 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);