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
;
186 /* RFC 2960 3.3.2 Initiation (INIT) (1)
188 * Note 1: The INIT chunks can contain multiple addresses that
189 * can be IPv4 and/or IPv6 in any combination.
193 /* Convert the provided bind address list to raw format. */
194 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
196 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
197 init
.a_rwnd
= htonl(asoc
->rwnd
);
198 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
199 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
200 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
202 /* How many address types are needed? */
203 sp
= sctp_sk(asoc
->base
.sk
);
204 num_types
= sp
->pf
->supported_addrs(sp
, types
);
206 chunksize
= sizeof(init
) + addrs_len
+ SCTP_SAT_LEN(num_types
);
207 chunksize
+= sizeof(ecap_param
);
208 if (sctp_prsctp_enable
) {
209 chunksize
+= sizeof(prsctp_param
);
210 extensions
[num_ext
] = SCTP_CID_FWD_TSN
;
213 /* ADDIP: Section 4.2.7:
214 * An implementation supporting this extension [ADDIP] MUST list
215 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
216 * INIT-ACK parameters.
217 * XXX: We don't support AUTH just yet, so don't list it. AUTH
218 * support should add it.
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 /* If we have any extensions to report, account for that */
231 chunksize
+= sizeof(sctp_supported_ext_param_t
) + num_ext
;
233 /* RFC 2960 3.3.2 Initiation (INIT) (1)
235 * Note 3: An INIT chunk MUST NOT contain more than one Host
236 * Name address parameter. Moreover, the sender of the INIT
237 * MUST NOT combine any other address types with the Host Name
238 * address in the INIT. The receiver of INIT MUST ignore any
239 * other address types if the Host Name address parameter is
240 * present in the received INIT chunk.
242 * PLEASE DO NOT FIXME [This version does not support Host Name.]
245 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT
, 0, chunksize
);
249 retval
->subh
.init_hdr
=
250 sctp_addto_chunk(retval
, sizeof(init
), &init
);
251 retval
->param_hdr
.v
=
252 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
254 /* RFC 2960 3.3.2 Initiation (INIT) (1)
256 * Note 4: This parameter, when present, specifies all the
257 * address types the sending endpoint can support. The absence
258 * of this parameter indicates that the sending endpoint can
259 * support any address type.
261 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
262 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
263 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
264 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
266 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
268 /* Add the supported extensions paramter. Be nice and add this
269 * fist before addiding the parameters for the extensions themselves
272 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
273 ext_param
.param_hdr
.length
=
274 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
275 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
277 sctp_addto_chunk(retval
, num_ext
, extensions
);
280 if (sctp_prsctp_enable
)
281 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
283 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
284 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
285 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
286 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
293 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
294 const struct sctp_chunk
*chunk
,
295 gfp_t gfp
, int unkparam_len
)
297 sctp_inithdr_t initack
;
298 struct sctp_chunk
*retval
;
299 union sctp_params addrs
;
301 sctp_cookie_param_t
*cookie
;
304 sctp_adaptation_ind_param_t aiparam
;
305 sctp_supported_ext_param_t ext_param
;
311 /* Note: there may be no addresses to embed. */
312 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
314 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
315 initack
.a_rwnd
= htonl(asoc
->rwnd
);
316 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
317 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
318 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
320 /* FIXME: We really ought to build the cookie right
321 * into the packet instead of allocating more fresh memory.
323 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
328 /* Calculate the total size of allocation, include the reserved
329 * space for reporting unknown parameters if it is specified.
331 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
333 /* Tell peer that we'll do ECN only if peer advertised such cap. */
334 if (asoc
->peer
.ecn_capable
)
335 chunksize
+= sizeof(ecap_param
);
337 /* Tell peer that we'll do PR-SCTP only if peer advertised. */
338 if (asoc
->peer
.prsctp_capable
) {
339 chunksize
+= sizeof(prsctp_param
);
340 extensions
[num_ext
] = SCTP_CID_FWD_TSN
;
344 if (sctp_addip_enable
) {
345 extensions
[num_ext
] = SCTP_CID_ASCONF
;
346 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
350 chunksize
+= sizeof(ext_param
) + num_ext
;
351 chunksize
+= sizeof(aiparam
);
353 /* Now allocate and fill out the chunk. */
354 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
);
358 /* Per the advice in RFC 2960 6.4, send this reply to
359 * the source of the INIT packet.
361 retval
->transport
= chunk
->transport
;
362 retval
->subh
.init_hdr
=
363 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
364 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
365 sctp_addto_chunk(retval
, cookie_len
, cookie
);
366 if (asoc
->peer
.ecn_capable
)
367 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
369 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
370 ext_param
.param_hdr
.length
=
371 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
372 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
374 sctp_addto_chunk(retval
, num_ext
, extensions
);
376 if (asoc
->peer
.prsctp_capable
)
377 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
379 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
380 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
381 aiparam
.adaptation_ind
= htonl(sctp_sk(asoc
->base
.sk
)->adaptation_ind
);
382 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
384 /* We need to remove the const qualifier at this point. */
385 retval
->asoc
= (struct sctp_association
*) asoc
;
387 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
389 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
390 * HEARTBEAT ACK, * etc.) to the same destination transport
391 * address from which it received the DATA or control chunk
392 * to which it is replying.
394 * [INIT ACK back to where the INIT came from.]
397 retval
->transport
= chunk
->transport
;
406 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
408 * This chunk is used only during the initialization of an association.
409 * It is sent by the initiator of an association to its peer to complete
410 * the initialization process. This chunk MUST precede any DATA chunk
411 * sent within the association, but MAY be bundled with one or more DATA
412 * chunks in the same packet.
415 * 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
416 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
417 * | Type = 10 |Chunk Flags | Length |
418 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
421 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
425 * Set to zero on transmit and ignored on receipt.
427 * Length: 16 bits (unsigned integer)
429 * Set to the size of the chunk in bytes, including the 4 bytes of
430 * the chunk header and the size of the Cookie.
432 * Cookie: variable size
434 * This field must contain the exact cookie received in the
435 * State Cookie parameter from the previous INIT ACK.
437 * An implementation SHOULD make the cookie as small as possible
438 * to insure interoperability.
440 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
441 const struct sctp_chunk
*chunk
)
443 struct sctp_chunk
*retval
;
447 cookie
= asoc
->peer
.cookie
;
448 cookie_len
= asoc
->peer
.cookie_len
;
450 /* Build a cookie echo chunk. */
451 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ECHO
, 0, cookie_len
);
454 retval
->subh
.cookie_hdr
=
455 sctp_addto_chunk(retval
, cookie_len
, cookie
);
457 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
459 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
460 * HEARTBEAT ACK, * etc.) to the same destination transport
461 * address from which it * received the DATA or control chunk
462 * to which it is replying.
464 * [COOKIE ECHO back to where the INIT ACK came from.]
467 retval
->transport
= chunk
->transport
;
473 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
475 * This chunk is used only during the initialization of an
476 * association. It is used to acknowledge the receipt of a COOKIE
477 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
478 * within the association, but MAY be bundled with one or more DATA
479 * chunks or SACK chunk in the same SCTP packet.
482 * 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
483 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
484 * | Type = 11 |Chunk Flags | Length = 4 |
485 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
487 * Chunk Flags: 8 bits
489 * Set to zero on transmit and ignored on receipt.
491 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
492 const struct sctp_chunk
*chunk
)
494 struct sctp_chunk
*retval
;
496 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0);
498 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
500 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
501 * HEARTBEAT ACK, * etc.) to the same destination transport
502 * address from which it * received the DATA or control chunk
503 * to which it is replying.
505 * [COOKIE ACK back to where the COOKIE ECHO came from.]
508 retval
->transport
= chunk
->transport
;
514 * Appendix A: Explicit Congestion Notification:
517 * RFC 2481 details a specific bit for a sender to send in the header of
518 * its next outbound TCP segment to indicate to its peer that it has
519 * reduced its congestion window. This is termed the CWR bit. For
520 * SCTP the same indication is made by including the CWR chunk.
521 * This chunk contains one data element, i.e. the TSN number that
522 * was sent in the ECNE chunk. This element represents the lowest
523 * TSN number in the datagram that was originally marked with the
527 * 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
528 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
529 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
530 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
531 * | Lowest TSN Number |
532 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
534 * Note: The CWR is considered a Control chunk.
536 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
537 const __u32 lowest_tsn
,
538 const struct sctp_chunk
*chunk
)
540 struct sctp_chunk
*retval
;
543 cwr
.lowest_tsn
= htonl(lowest_tsn
);
544 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_CWR
, 0,
545 sizeof(sctp_cwrhdr_t
));
550 retval
->subh
.ecn_cwr_hdr
=
551 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
553 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
555 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
556 * HEARTBEAT ACK, * etc.) to the same destination transport
557 * address from which it * received the DATA or control chunk
558 * to which it is replying.
560 * [Report a reduced congestion window back to where the ECNE
564 retval
->transport
= chunk
->transport
;
570 /* Make an ECNE chunk. This is a congestion experienced report. */
571 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
572 const __u32 lowest_tsn
)
574 struct sctp_chunk
*retval
;
577 ecne
.lowest_tsn
= htonl(lowest_tsn
);
578 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_ECNE
, 0,
579 sizeof(sctp_ecnehdr_t
));
582 retval
->subh
.ecne_hdr
=
583 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
589 /* Make a DATA chunk for the given association from the provided
590 * parameters. However, do not populate the data payload.
592 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
593 const struct sctp_sndrcvinfo
*sinfo
,
594 int data_len
, __u8 flags
, __u16 ssn
)
596 struct sctp_chunk
*retval
;
597 struct sctp_datahdr dp
;
600 /* We assign the TSN as LATE as possible, not here when
601 * creating the chunk.
604 dp
.stream
= htons(sinfo
->sinfo_stream
);
605 dp
.ppid
= sinfo
->sinfo_ppid
;
607 /* Set the flags for an unordered send. */
608 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
609 flags
|= SCTP_DATA_UNORDERED
;
614 chunk_len
= sizeof(dp
) + data_len
;
615 retval
= sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, chunk_len
);
619 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
620 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
626 /* Create a selective ackowledgement (SACK) for the given
627 * association. This reports on which TSN's we've seen to date,
628 * including duplicates and gaps.
630 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
632 struct sctp_chunk
*retval
;
633 struct sctp_sackhdr sack
;
636 __u16 num_gabs
, num_dup_tsns
;
637 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
639 ctsn
= sctp_tsnmap_get_ctsn(map
);
640 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn
);
642 /* How much room is needed in the chunk? */
643 num_gabs
= sctp_tsnmap_num_gabs(map
);
644 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
646 /* Initialize the SACK header. */
647 sack
.cum_tsn_ack
= htonl(ctsn
);
648 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
649 sack
.num_gap_ack_blocks
= htons(num_gabs
);
650 sack
.num_dup_tsns
= htons(num_dup_tsns
);
653 + sizeof(struct sctp_gap_ack_block
) * num_gabs
654 + sizeof(__u32
) * num_dup_tsns
;
656 /* Create the chunk. */
657 retval
= sctp_make_chunk(asoc
, SCTP_CID_SACK
, 0, len
);
661 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
663 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
664 * HEARTBEAT ACK, etc.) to the same destination transport
665 * address from which it received the DATA or control chunk to
666 * which it is replying. This rule should also be followed if
667 * the endpoint is bundling DATA chunks together with the
670 * However, when acknowledging multiple DATA chunks received
671 * in packets from different source addresses in a single
672 * SACK, the SACK chunk may be transmitted to one of the
673 * destination transport addresses from which the DATA or
674 * control chunks being acknowledged were received.
676 * [BUG: We do not implement the following paragraph.
677 * Perhaps we should remember the last transport we used for a
678 * SACK and avoid that (if possible) if we have seen any
679 * duplicates. --piggy]
681 * When a receiver of a duplicate DATA chunk sends a SACK to a
682 * multi- homed endpoint it MAY be beneficial to vary the
683 * destination address and not use the source address of the
684 * DATA chunk. The reason being that receiving a duplicate
685 * from a multi-homed endpoint might indicate that the return
686 * path (as specified in the source address of the DATA chunk)
687 * for the SACK is broken.
689 * [Send to the address from which we last received a DATA chunk.]
691 retval
->transport
= asoc
->peer
.last_data_from
;
693 retval
->subh
.sack_hdr
=
694 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
696 /* Add the gap ack block information. */
698 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
699 sctp_tsnmap_get_gabs(map
));
701 /* Add the duplicate TSN information. */
703 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
704 sctp_tsnmap_get_dups(map
));
710 /* Make a SHUTDOWN chunk. */
711 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
712 const struct sctp_chunk
*chunk
)
714 struct sctp_chunk
*retval
;
715 sctp_shutdownhdr_t shut
;
718 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
719 shut
.cum_tsn_ack
= htonl(ctsn
);
721 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN
, 0,
722 sizeof(sctp_shutdownhdr_t
));
726 retval
->subh
.shutdown_hdr
=
727 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
730 retval
->transport
= chunk
->transport
;
735 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
736 const struct sctp_chunk
*chunk
)
738 struct sctp_chunk
*retval
;
740 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0);
742 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
744 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
745 * HEARTBEAT ACK, * etc.) to the same destination transport
746 * address from which it * received the DATA or control chunk
747 * to which it is replying.
749 * [ACK back to where the SHUTDOWN came from.]
752 retval
->transport
= chunk
->transport
;
757 struct sctp_chunk
*sctp_make_shutdown_complete(
758 const struct sctp_association
*asoc
,
759 const struct sctp_chunk
*chunk
)
761 struct sctp_chunk
*retval
;
764 /* Set the T-bit if we have no association (vtag will be
767 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
769 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
, 0);
771 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
773 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
774 * HEARTBEAT ACK, * etc.) to the same destination transport
775 * address from which it * received the DATA or control chunk
776 * to which it is replying.
778 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
782 retval
->transport
= chunk
->transport
;
787 /* Create an ABORT. Note that we set the T bit if we have no
788 * association, except when responding to an INIT (sctpimpguide 2.41).
790 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
791 const struct sctp_chunk
*chunk
,
794 struct sctp_chunk
*retval
;
797 /* Set the T-bit if we have no association and 'chunk' is not
798 * an INIT (vtag will be reflected).
801 if (chunk
&& chunk
->chunk_hdr
&&
802 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
805 flags
= SCTP_CHUNK_FLAG_T
;
808 retval
= sctp_make_chunk(asoc
, SCTP_CID_ABORT
, flags
, hint
);
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 * [ABORT back to where the offender came from.]
820 retval
->transport
= chunk
->transport
;
825 /* Helper to create ABORT with a NO_USER_DATA error. */
826 struct sctp_chunk
*sctp_make_abort_no_data(
827 const struct sctp_association
*asoc
,
828 const struct sctp_chunk
*chunk
, __u32 tsn
)
830 struct sctp_chunk
*retval
;
833 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
839 /* Put the tsn back into network byte order. */
840 payload
= htonl(tsn
);
841 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
842 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
844 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
846 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
847 * HEARTBEAT ACK, * etc.) to the same destination transport
848 * address from which it * received the DATA or control chunk
849 * to which it is replying.
851 * [ABORT back to where the offender came from.]
854 retval
->transport
= chunk
->transport
;
860 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
861 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
862 const struct msghdr
*msg
,
865 struct sctp_chunk
*retval
;
866 void *payload
= NULL
;
869 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
874 /* Put the msg_iov together into payload. */
875 payload
= kmalloc(paylen
, GFP_KERNEL
);
879 err
= memcpy_fromiovec(payload
, msg
->msg_iov
, paylen
);
884 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
885 sctp_addto_chunk(retval
, paylen
, payload
);
895 sctp_chunk_free(retval
);
901 /* Append bytes to the end of a parameter. Will panic if chunk is not big
904 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
908 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
910 target
= skb_put(chunk
->skb
, len
);
912 memcpy(target
, data
, len
);
914 /* Adjust the chunk length field. */
915 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
916 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
921 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
922 struct sctp_chunk
*sctp_make_abort_violation(
923 const struct sctp_association
*asoc
,
924 const struct sctp_chunk
*chunk
,
928 struct sctp_chunk
*retval
;
929 struct sctp_paramhdr phdr
;
931 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
932 + sizeof(sctp_paramhdr_t
));
936 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
937 + sizeof(sctp_paramhdr_t
));
939 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
940 phdr
.length
= chunk
->chunk_hdr
->length
;
941 sctp_addto_chunk(retval
, paylen
, payload
);
942 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
948 /* Make a HEARTBEAT chunk. */
949 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
950 const struct sctp_transport
*transport
,
951 const void *payload
, const size_t paylen
)
953 struct sctp_chunk
*retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT
,
959 /* Cast away the 'const', as this is just telling the chunk
960 * what transport it belongs to.
962 retval
->transport
= (struct sctp_transport
*) transport
;
963 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
969 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
970 const struct sctp_chunk
*chunk
,
971 const void *payload
, const size_t paylen
)
973 struct sctp_chunk
*retval
;
975 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
);
979 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
981 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
983 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
984 * HEARTBEAT ACK, * etc.) to the same destination transport
985 * address from which it * received the DATA or control chunk
986 * to which it is replying.
988 * [HBACK back to where the HEARTBEAT came from.]
991 retval
->transport
= chunk
->transport
;
997 /* Create an Operation Error chunk with the specified space reserved.
998 * This routine can be used for containing multiple causes in the chunk.
1000 static struct sctp_chunk
*sctp_make_op_error_space(
1001 const struct sctp_association
*asoc
,
1002 const struct sctp_chunk
*chunk
,
1005 struct sctp_chunk
*retval
;
1007 retval
= sctp_make_chunk(asoc
, SCTP_CID_ERROR
, 0,
1008 sizeof(sctp_errhdr_t
) + size
);
1012 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1014 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1015 * HEARTBEAT ACK, etc.) to the same destination transport
1016 * address from which it received the DATA or control chunk
1017 * to which it is replying.
1021 retval
->transport
= chunk
->transport
;
1027 /* Create an Operation Error chunk. */
1028 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1029 const struct sctp_chunk
*chunk
,
1030 __be16 cause_code
, const void *payload
,
1033 struct sctp_chunk
*retval
;
1035 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
);
1039 sctp_init_cause(retval
, cause_code
, paylen
);
1040 sctp_addto_chunk(retval
, paylen
, payload
);
1046 /********************************************************************
1047 * 2nd Level Abstractions
1048 ********************************************************************/
1050 /* Turn an skb into a chunk.
1051 * FIXME: Eventually move the structure directly inside the skb->cb[].
1053 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1054 const struct sctp_association
*asoc
,
1057 struct sctp_chunk
*retval
;
1059 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, GFP_ATOMIC
);
1065 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb
);
1068 INIT_LIST_HEAD(&retval
->list
);
1070 retval
->asoc
= (struct sctp_association
*)asoc
;
1072 retval
->has_tsn
= 0;
1073 retval
->has_ssn
= 0;
1074 retval
->rtt_in_progress
= 0;
1075 retval
->sent_at
= 0;
1076 retval
->singleton
= 1;
1077 retval
->end_of_packet
= 0;
1078 retval
->ecn_ce_done
= 0;
1079 retval
->pdiscard
= 0;
1081 /* sctpimpguide-05.txt Section 2.8.2
1082 * M1) Each time a new DATA chunk is transmitted
1083 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1084 * 'TSN.Missing.Report' count will be used to determine missing chunks
1085 * and when to fast retransmit.
1087 retval
->tsn_missing_report
= 0;
1088 retval
->tsn_gap_acked
= 0;
1089 retval
->fast_retransmit
= 0;
1091 /* If this is a fragmented message, track all fragments
1092 * of the message (for SEND_FAILED).
1096 /* Polish the bead hole. */
1097 INIT_LIST_HEAD(&retval
->transmitted_list
);
1098 INIT_LIST_HEAD(&retval
->frag_list
);
1099 SCTP_DBG_OBJCNT_INC(chunk
);
1100 atomic_set(&retval
->refcnt
, 1);
1106 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1107 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1108 union sctp_addr
*dest
)
1110 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1111 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1114 /* Extract the source address from a chunk. */
1115 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1117 /* If we have a known transport, use that. */
1118 if (chunk
->transport
) {
1119 return &chunk
->transport
->ipaddr
;
1121 /* Otherwise, extract it from the IP header. */
1122 return &chunk
->source
;
1126 /* Create a new chunk, setting the type and flags headers from the
1127 * arguments, reserving enough space for a 'paylen' byte payload.
1130 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
1131 __u8 type
, __u8 flags
, int paylen
)
1133 struct sctp_chunk
*retval
;
1134 sctp_chunkhdr_t
*chunk_hdr
;
1135 struct sk_buff
*skb
;
1138 /* No need to allocate LL here, as this is only a chunk. */
1139 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
),
1144 /* Make room for the chunk header. */
1145 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1146 chunk_hdr
->type
= type
;
1147 chunk_hdr
->flags
= flags
;
1148 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1150 sk
= asoc
? asoc
->base
.sk
: NULL
;
1151 retval
= sctp_chunkify(skb
, asoc
, sk
);
1157 retval
->chunk_hdr
= chunk_hdr
;
1158 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1160 /* Set the skb to the belonging sock for accounting. */
1169 /* Release the memory occupied by a chunk. */
1170 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1172 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1173 dev_kfree_skb(chunk
->skb
);
1175 SCTP_DBG_OBJCNT_DEC(chunk
);
1176 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1179 /* Possibly, free the chunk. */
1180 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1182 BUG_ON(!list_empty(&chunk
->list
));
1183 list_del_init(&chunk
->transmitted_list
);
1185 /* Release our reference on the message tracker. */
1187 sctp_datamsg_put(chunk
->msg
);
1189 sctp_chunk_put(chunk
);
1192 /* Grab a reference to the chunk. */
1193 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1195 atomic_inc(&ch
->refcnt
);
1198 /* Release a reference to the chunk. */
1199 void sctp_chunk_put(struct sctp_chunk
*ch
)
1201 if (atomic_dec_and_test(&ch
->refcnt
))
1202 sctp_chunk_destroy(ch
);
1205 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1208 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1212 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1213 int padlen
= WORD_ROUND(chunklen
) - chunklen
;
1215 padding
= skb_put(chunk
->skb
, padlen
);
1216 target
= skb_put(chunk
->skb
, len
);
1218 memset(padding
, 0, padlen
);
1219 memcpy(target
, data
, len
);
1221 /* Adjust the chunk length field. */
1222 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1223 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1228 /* Append bytes from user space to the end of a chunk. Will panic if
1229 * chunk is not big enough.
1230 * Returns a kernel err value.
1232 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int off
, int len
,
1238 /* Make room in chunk for data. */
1239 target
= skb_put(chunk
->skb
, len
);
1241 /* Copy data (whole iovec) into chunk */
1242 if ((err
= memcpy_fromiovecend(target
, data
, off
, len
)))
1245 /* Adjust the chunk length field. */
1246 chunk
->chunk_hdr
->length
=
1247 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1248 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1254 /* Helper function to assign a TSN if needed. This assumes that both
1255 * the data_hdr and association have already been assigned.
1257 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1259 struct sctp_datamsg
*msg
;
1260 struct sctp_chunk
*lchunk
;
1261 struct sctp_stream
*stream
;
1268 /* All fragments will be on the same stream */
1269 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1270 stream
= &chunk
->asoc
->ssnmap
->out
;
1272 /* Now assign the sequence number to the entire message.
1273 * All fragments must have the same stream sequence number.
1276 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1277 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1280 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1281 ssn
= sctp_ssn_next(stream
, sid
);
1283 ssn
= sctp_ssn_peek(stream
, sid
);
1286 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1287 lchunk
->has_ssn
= 1;
1291 /* Helper function to assign a TSN if needed. This assumes that both
1292 * the data_hdr and association have already been assigned.
1294 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1296 if (!chunk
->has_tsn
) {
1297 /* This is the last possible instant to
1300 chunk
->subh
.data_hdr
->tsn
=
1301 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1306 /* Create a CLOSED association to use with an incoming packet. */
1307 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1308 struct sctp_chunk
*chunk
,
1311 struct sctp_association
*asoc
;
1312 struct sk_buff
*skb
;
1316 /* Create the bare association. */
1317 scope
= sctp_scope(sctp_source(chunk
));
1318 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1323 /* Create an entry for the source address of the packet. */
1324 af
= sctp_get_af_specific(ipver2af(ip_hdr(skb
)->version
));
1327 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1332 sctp_association_free(asoc
);
1336 /* Build a cookie representing asoc.
1337 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1339 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1340 const struct sctp_association
*asoc
,
1341 const struct sctp_chunk
*init_chunk
,
1343 const __u8
*raw_addrs
, int addrs_len
)
1345 sctp_cookie_param_t
*retval
;
1346 struct sctp_signed_cookie
*cookie
;
1347 struct scatterlist sg
;
1348 int headersize
, bodysize
;
1349 unsigned int keylen
;
1352 /* Header size is static data prior to the actual cookie, including
1355 headersize
= sizeof(sctp_paramhdr_t
) +
1356 (sizeof(struct sctp_signed_cookie
) -
1357 sizeof(struct sctp_cookie
));
1358 bodysize
= sizeof(struct sctp_cookie
)
1359 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1361 /* Pad out the cookie to a multiple to make the signature
1362 * functions simpler to write.
1364 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1365 bodysize
+= SCTP_COOKIE_MULTIPLE
1366 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1367 *cookie_len
= headersize
+ bodysize
;
1369 /* Clear this memory since we are sending this data structure
1370 * out on the network.
1372 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1376 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1378 /* Set up the parameter header. */
1379 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1380 retval
->p
.length
= htons(*cookie_len
);
1382 /* Copy the cookie part of the association itself. */
1383 cookie
->c
= asoc
->c
;
1384 /* Save the raw address list length in the cookie. */
1385 cookie
->c
.raw_addr_list_len
= addrs_len
;
1387 /* Remember PR-SCTP capability. */
1388 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1390 /* Save adaptation indication in the cookie. */
1391 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1393 /* Set an expiration time for the cookie. */
1394 do_gettimeofday(&cookie
->c
.expiration
);
1395 TIMEVAL_ADD(asoc
->cookie_life
, cookie
->c
.expiration
);
1397 /* Copy the peer's init packet. */
1398 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1399 ntohs(init_chunk
->chunk_hdr
->length
));
1401 /* Copy the raw local address list of the association. */
1402 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1403 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1405 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1406 struct hash_desc desc
;
1408 /* Sign the message. */
1409 sg
.page
= virt_to_page(&cookie
->c
);
1410 sg
.offset
= (unsigned long)(&cookie
->c
) % PAGE_SIZE
;
1411 sg
.length
= bodysize
;
1412 keylen
= SCTP_SECRET_SIZE
;
1413 key
= (char *)ep
->secret_key
[ep
->current_key
];
1414 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1417 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1418 crypto_hash_digest(&desc
, &sg
, bodysize
, cookie
->signature
))
1431 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1432 struct sctp_association
*sctp_unpack_cookie(
1433 const struct sctp_endpoint
*ep
,
1434 const struct sctp_association
*asoc
,
1435 struct sctp_chunk
*chunk
, gfp_t gfp
,
1436 int *error
, struct sctp_chunk
**errp
)
1438 struct sctp_association
*retval
= NULL
;
1439 struct sctp_signed_cookie
*cookie
;
1440 struct sctp_cookie
*bear_cookie
;
1441 int headersize
, bodysize
, fixed_size
;
1442 __u8
*digest
= ep
->digest
;
1443 struct scatterlist sg
;
1444 unsigned int keylen
, len
;
1447 struct sk_buff
*skb
= chunk
->skb
;
1449 struct hash_desc desc
;
1451 /* Header size is static data prior to the actual cookie, including
1454 headersize
= sizeof(sctp_chunkhdr_t
) +
1455 (sizeof(struct sctp_signed_cookie
) -
1456 sizeof(struct sctp_cookie
));
1457 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1458 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1460 /* Verify that the chunk looks like it even has a cookie.
1461 * There must be enough room for our cookie and our peer's
1464 len
= ntohs(chunk
->chunk_hdr
->length
);
1465 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1468 /* Verify that the cookie has been padded out. */
1469 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1472 /* Process the cookie. */
1473 cookie
= chunk
->subh
.cookie_hdr
;
1474 bear_cookie
= &cookie
->c
;
1476 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1479 /* Check the signature. */
1480 keylen
= SCTP_SECRET_SIZE
;
1481 sg
.page
= virt_to_page(bear_cookie
);
1482 sg
.offset
= (unsigned long)(bear_cookie
) % PAGE_SIZE
;
1483 sg
.length
= bodysize
;
1484 key
= (char *)ep
->secret_key
[ep
->current_key
];
1485 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1488 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1489 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1490 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1491 *error
= -SCTP_IERROR_NOMEM
;
1495 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1496 /* Try the previous key. */
1497 key
= (char *)ep
->secret_key
[ep
->last_key
];
1498 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1499 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1500 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1501 *error
= -SCTP_IERROR_NOMEM
;
1505 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1506 /* Yikes! Still bad signature! */
1507 *error
= -SCTP_IERROR_BAD_SIG
;
1513 /* IG Section 2.35.2:
1514 * 3) Compare the port numbers and the verification tag contained
1515 * within the COOKIE ECHO chunk to the actual port numbers and the
1516 * verification tag within the SCTP common header of the received
1517 * packet. If these values do not match the packet MUST be silently
1520 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1521 *error
= -SCTP_IERROR_BAD_TAG
;
1525 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1526 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1527 *error
= -SCTP_IERROR_BAD_PORTS
;
1531 /* Check to see if the cookie is stale. If there is already
1532 * an association, there is no need to check cookie's expiration
1533 * for init collision case of lost COOKIE ACK.
1534 * If skb has been timestamped, then use the stamp, otherwise
1535 * use current time. This introduces a small possibility that
1536 * that a cookie may be considered expired, but his would only slow
1537 * down the new association establishment instead of every packet.
1539 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1540 skb_get_timestamp(skb
, &tv
);
1542 do_gettimeofday(&tv
);
1544 if (!asoc
&& tv_lt(bear_cookie
->expiration
, tv
)) {
1546 * Section 3.3.10.3 Stale Cookie Error (3)
1550 * Stale Cookie Error: Indicates the receipt of a valid State
1551 * Cookie that has expired.
1553 len
= ntohs(chunk
->chunk_hdr
->length
);
1554 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1556 suseconds_t usecs
= (tv
.tv_sec
-
1557 bear_cookie
->expiration
.tv_sec
) * 1000000L +
1558 tv
.tv_usec
- bear_cookie
->expiration
.tv_usec
;
1559 __be32 n
= htonl(usecs
);
1561 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1563 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1564 *error
= -SCTP_IERROR_STALE_COOKIE
;
1566 *error
= -SCTP_IERROR_NOMEM
;
1571 /* Make a new base association. */
1572 scope
= sctp_scope(sctp_source(chunk
));
1573 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1575 *error
= -SCTP_IERROR_NOMEM
;
1579 /* Set up our peer's port number. */
1580 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1582 /* Populate the association from the cookie. */
1583 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1585 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1587 *error
= -SCTP_IERROR_NOMEM
;
1591 /* Also, add the destination address. */
1592 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1593 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
, 1,
1597 retval
->next_tsn
= retval
->c
.initial_tsn
;
1598 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1599 retval
->addip_serial
= retval
->c
.initial_tsn
;
1600 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1601 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1602 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1604 /* The INIT stuff will be done by the side effects. */
1609 sctp_association_free(retval
);
1614 /* Yikes! The packet is either corrupt or deliberately
1617 *error
= -SCTP_IERROR_MALFORMED
;
1621 /********************************************************************
1622 * 3rd Level Abstractions
1623 ********************************************************************/
1625 struct __sctp_missing
{
1628 } __attribute__((packed
));
1631 * Report a missing mandatory parameter.
1633 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1634 sctp_param_t paramtype
,
1635 struct sctp_chunk
*chunk
,
1636 struct sctp_chunk
**errp
)
1638 struct __sctp_missing report
;
1641 len
= WORD_ROUND(sizeof(report
));
1643 /* Make an ERROR chunk, preparing enough room for
1644 * returning multiple unknown parameters.
1647 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1650 report
.num_missing
= htonl(1);
1651 report
.type
= paramtype
;
1652 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1654 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1657 /* Stop processing this chunk. */
1661 /* Report an Invalid Mandatory Parameter. */
1662 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1663 struct sctp_chunk
*chunk
,
1664 struct sctp_chunk
**errp
)
1666 /* Invalid Mandatory Parameter Error has no payload. */
1669 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1672 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1674 /* Stop processing this chunk. */
1678 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1679 struct sctp_paramhdr
*param
,
1680 const struct sctp_chunk
*chunk
,
1681 struct sctp_chunk
**errp
)
1683 char error
[] = "The following parameter had invalid length:";
1684 size_t payload_len
= WORD_ROUND(sizeof(error
)) +
1685 sizeof(sctp_paramhdr_t
);
1688 /* Create an error chunk and fill it in with our payload. */
1690 *errp
= sctp_make_op_error_space(asoc
, chunk
, payload_len
);
1693 sctp_init_cause(*errp
, SCTP_ERROR_PROTO_VIOLATION
,
1694 sizeof(error
) + sizeof(sctp_paramhdr_t
));
1695 sctp_addto_chunk(*errp
, sizeof(error
), error
);
1696 sctp_addto_param(*errp
, sizeof(sctp_paramhdr_t
), param
);
1703 /* Do not attempt to handle the HOST_NAME parm. However, do
1704 * send back an indicator to the peer.
1706 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1707 union sctp_params param
,
1708 struct sctp_chunk
*chunk
,
1709 struct sctp_chunk
**errp
)
1711 __u16 len
= ntohs(param
.p
->length
);
1713 /* Make an ERROR chunk. */
1715 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1718 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1719 sctp_addto_chunk(*errp
, len
, param
.v
);
1722 /* Stop processing this chunk. */
1726 static void sctp_process_ext_param(struct sctp_association
*asoc
,
1727 union sctp_params param
)
1729 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1732 for (i
= 0; i
< num_ext
; i
++) {
1733 switch (param
.ext
->chunks
[i
]) {
1734 case SCTP_CID_FWD_TSN
:
1735 if (sctp_prsctp_enable
&&
1736 !asoc
->peer
.prsctp_capable
)
1737 asoc
->peer
.prsctp_capable
= 1;
1739 case SCTP_CID_ASCONF
:
1740 case SCTP_CID_ASCONF_ACK
:
1741 /* don't need to do anything for ASCONF */
1748 /* RFC 3.2.1 & the Implementers Guide 2.2.
1750 * The Parameter Types are encoded such that the
1751 * highest-order two bits specify the action that must be
1752 * taken if the processing endpoint does not recognize the
1755 * 00 - Stop processing this SCTP chunk and discard it,
1756 * do not process any further chunks within it.
1758 * 01 - Stop processing this SCTP chunk and discard it,
1759 * do not process any further chunks within it, and report
1760 * the unrecognized parameter in an 'Unrecognized
1761 * Parameter Type' (in either an ERROR or in the INIT ACK).
1763 * 10 - Skip this parameter and continue processing.
1765 * 11 - Skip this parameter and continue processing but
1766 * report the unrecognized parameter in an
1767 * 'Unrecognized Parameter Type' (in either an ERROR or in
1771 * 0 - discard the chunk
1772 * 1 - continue with the chunk
1774 static int sctp_process_unk_param(const struct sctp_association
*asoc
,
1775 union sctp_params param
,
1776 struct sctp_chunk
*chunk
,
1777 struct sctp_chunk
**errp
)
1781 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
1782 case SCTP_PARAM_ACTION_DISCARD
:
1785 case SCTP_PARAM_ACTION_DISCARD_ERR
:
1787 /* Make an ERROR chunk, preparing enough room for
1788 * returning multiple unknown parameters.
1791 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1792 ntohs(chunk
->chunk_hdr
->length
));
1795 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1796 WORD_ROUND(ntohs(param
.p
->length
)));
1797 sctp_addto_chunk(*errp
,
1798 WORD_ROUND(ntohs(param
.p
->length
)),
1803 case SCTP_PARAM_ACTION_SKIP
:
1805 case SCTP_PARAM_ACTION_SKIP_ERR
:
1806 /* Make an ERROR chunk, preparing enough room for
1807 * returning multiple unknown parameters.
1810 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1811 ntohs(chunk
->chunk_hdr
->length
));
1814 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1815 WORD_ROUND(ntohs(param
.p
->length
)));
1816 sctp_addto_chunk(*errp
,
1817 WORD_ROUND(ntohs(param
.p
->length
)),
1820 /* If there is no memory for generating the ERROR
1821 * report as specified, an ABORT will be triggered
1822 * to the peer and the association won't be
1836 /* Find unrecognized parameters in the chunk.
1838 * 0 - discard the chunk
1839 * 1 - continue with the chunk
1841 static int sctp_verify_param(const struct sctp_association
*asoc
,
1842 union sctp_params param
,
1844 struct sctp_chunk
*chunk
,
1845 struct sctp_chunk
**err_chunk
)
1849 /* FIXME - This routine is not looking at each parameter per the
1850 * chunk type, i.e., unrecognized parameters should be further
1851 * identified based on the chunk id.
1854 switch (param
.p
->type
) {
1855 case SCTP_PARAM_IPV4_ADDRESS
:
1856 case SCTP_PARAM_IPV6_ADDRESS
:
1857 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
1858 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
1859 case SCTP_PARAM_STATE_COOKIE
:
1860 case SCTP_PARAM_HEARTBEAT_INFO
:
1861 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
1862 case SCTP_PARAM_ECN_CAPABLE
:
1863 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
1864 case SCTP_PARAM_SUPPORTED_EXT
:
1867 case SCTP_PARAM_HOST_NAME_ADDRESS
:
1868 /* Tell the peer, we won't support this param. */
1869 return sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
1871 case SCTP_PARAM_FWD_TSN_SUPPORT
:
1872 if (sctp_prsctp_enable
)
1876 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
1877 ntohs(param
.p
->type
), cid
);
1878 return sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
1885 /* Verify the INIT packet before we process it. */
1886 int sctp_verify_init(const struct sctp_association
*asoc
,
1888 sctp_init_chunk_t
*peer_init
,
1889 struct sctp_chunk
*chunk
,
1890 struct sctp_chunk
**errp
)
1892 union sctp_params param
;
1895 /* Verify stream values are non-zero. */
1896 if ((0 == peer_init
->init_hdr
.num_outbound_streams
) ||
1897 (0 == peer_init
->init_hdr
.num_inbound_streams
) ||
1898 (0 == peer_init
->init_hdr
.init_tag
) ||
1899 (SCTP_DEFAULT_MINWINDOW
> ntohl(peer_init
->init_hdr
.a_rwnd
))) {
1901 sctp_process_inv_mandatory(asoc
, chunk
, errp
);
1905 /* Check for missing mandatory parameters. */
1906 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1908 if (SCTP_PARAM_STATE_COOKIE
== param
.p
->type
)
1911 } /* for (loop through all parameters) */
1913 /* There is a possibility that a parameter length was bad and
1914 * in that case we would have stoped walking the parameters.
1915 * The current param.p would point at the bad one.
1916 * Current consensus on the mailing list is to generate a PROTOCOL
1917 * VIOLATION error. We build the ERROR chunk here and let the normal
1918 * error handling code build and send the packet.
1920 if (param
.v
!= (void*)chunk
->chunk_end
) {
1921 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
1925 /* The only missing mandatory param possible today is
1926 * the state cookie for an INIT-ACK chunk.
1928 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
) {
1929 sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
1934 /* Find unrecognized parameters. */
1936 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1938 if (!sctp_verify_param(asoc
, param
, cid
, chunk
, errp
)) {
1939 if (SCTP_PARAM_HOST_NAME_ADDRESS
== param
.p
->type
)
1945 } /* for (loop through all parameters) */
1950 /* Unpack the parameters in an INIT packet into an association.
1951 * Returns 0 on failure, else success.
1952 * FIXME: This is an association method.
1954 int sctp_process_init(struct sctp_association
*asoc
, sctp_cid_t cid
,
1955 const union sctp_addr
*peer_addr
,
1956 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
1958 union sctp_params param
;
1959 struct sctp_transport
*transport
;
1960 struct list_head
*pos
, *temp
;
1963 /* We must include the address that the INIT packet came from.
1964 * This is the only address that matters for an INIT packet.
1965 * When processing a COOKIE ECHO, we retrieve the from address
1966 * of the INIT from the cookie.
1969 /* This implementation defaults to making the first transport
1970 * added as the primary transport. The source address seems to
1971 * be a a better choice than any of the embedded addresses.
1974 if(!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
1978 /* Process the initialization parameters. */
1980 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1982 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
1986 /* Walk list of transports, removing transports in the UNKNOWN state. */
1987 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
1988 transport
= list_entry(pos
, struct sctp_transport
, transports
);
1989 if (transport
->state
== SCTP_UNKNOWN
) {
1990 sctp_assoc_rm_peer(asoc
, transport
);
1994 /* The fixed INIT headers are always in network byte
1997 asoc
->peer
.i
.init_tag
=
1998 ntohl(peer_init
->init_hdr
.init_tag
);
1999 asoc
->peer
.i
.a_rwnd
=
2000 ntohl(peer_init
->init_hdr
.a_rwnd
);
2001 asoc
->peer
.i
.num_outbound_streams
=
2002 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2003 asoc
->peer
.i
.num_inbound_streams
=
2004 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2005 asoc
->peer
.i
.initial_tsn
=
2006 ntohl(peer_init
->init_hdr
.initial_tsn
);
2008 /* Apply the upper bounds for output streams based on peer's
2009 * number of inbound streams.
2011 if (asoc
->c
.sinit_num_ostreams
>
2012 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2013 asoc
->c
.sinit_num_ostreams
=
2014 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2017 if (asoc
->c
.sinit_max_instreams
>
2018 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2019 asoc
->c
.sinit_max_instreams
=
2020 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2023 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2024 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2026 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2027 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2029 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2030 cookie
= asoc
->peer
.cookie
;
2032 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2033 if (!asoc
->peer
.cookie
)
2037 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2038 * high (for example, implementations MAY use the size of the receiver
2039 * advertised window).
2041 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2042 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2043 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2046 /* Set up the TSN tracking pieces. */
2047 sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_SIZE
,
2048 asoc
->peer
.i
.initial_tsn
);
2050 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2052 * The stream sequence number in all the streams shall start
2053 * from 0 when the association is established. Also, when the
2054 * stream sequence number reaches the value 65535 the next
2055 * stream sequence number shall be set to 0.
2058 /* Allocate storage for the negotiated streams if it is not a temporary
2064 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
2065 asoc
->c
.sinit_num_ostreams
, gfp
);
2069 error
= sctp_assoc_set_id(asoc
, gfp
);
2074 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2076 * When an endpoint has an ASCONF signaled change to be sent to the
2077 * remote endpoint it should do the following:
2079 * A2) A serial number should be assigned to the Chunk. The serial
2080 * number should be a monotonically increasing number. All serial
2081 * numbers are defined to be initialized at the start of the
2082 * association to the same value as the Initial TSN.
2084 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2088 /* Release the transport structures. */
2089 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2090 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2092 sctp_transport_free(transport
);
2095 asoc
->peer
.transport_count
= 0;
2102 /* Update asoc with the option described in param.
2104 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2106 * asoc is the association to update.
2107 * param is the variable length parameter to use for update.
2108 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2109 * If the current packet is an INIT we want to minimize the amount of
2110 * work we do. In particular, we should not build transport
2111 * structures for the addresses.
2113 static int sctp_process_param(struct sctp_association
*asoc
,
2114 union sctp_params param
,
2115 const union sctp_addr
*peer_addr
,
2118 union sctp_addr addr
;
2126 /* We maintain all INIT parameters in network byte order all the
2127 * time. This allows us to not worry about whether the parameters
2128 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2130 switch (param
.p
->type
) {
2131 case SCTP_PARAM_IPV6_ADDRESS
:
2132 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2135 case SCTP_PARAM_IPV4_ADDRESS
:
2136 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2137 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2138 scope
= sctp_scope(peer_addr
);
2139 if (sctp_in_scope(&addr
, scope
))
2140 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2144 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2145 if (!sctp_cookie_preserve_enable
)
2148 stale
= ntohl(param
.life
->lifespan_increment
);
2150 /* Suggested Cookie Life span increment's unit is msec,
2153 asoc
->cookie_life
.tv_sec
+= stale
/ 1000;
2154 asoc
->cookie_life
.tv_usec
+= (stale
% 1000) * 1000;
2157 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2158 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2161 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2162 /* Turn off the default values first so we'll know which
2163 * ones are really set by the peer.
2165 asoc
->peer
.ipv4_address
= 0;
2166 asoc
->peer
.ipv6_address
= 0;
2168 /* Cycle through address types; avoid divide by 0. */
2169 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2171 sat
/= sizeof(__u16
);
2173 for (i
= 0; i
< sat
; ++i
) {
2174 switch (param
.sat
->types
[i
]) {
2175 case SCTP_PARAM_IPV4_ADDRESS
:
2176 asoc
->peer
.ipv4_address
= 1;
2179 case SCTP_PARAM_IPV6_ADDRESS
:
2180 asoc
->peer
.ipv6_address
= 1;
2183 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2184 asoc
->peer
.hostname_address
= 1;
2187 default: /* Just ignore anything else. */
2193 case SCTP_PARAM_STATE_COOKIE
:
2194 asoc
->peer
.cookie_len
=
2195 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2196 asoc
->peer
.cookie
= param
.cookie
->body
;
2199 case SCTP_PARAM_HEARTBEAT_INFO
:
2200 /* Would be odd to receive, but it causes no problems. */
2203 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2204 /* Rejected during verify stage. */
2207 case SCTP_PARAM_ECN_CAPABLE
:
2208 asoc
->peer
.ecn_capable
= 1;
2211 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2212 asoc
->peer
.adaptation_ind
= param
.aind
->adaptation_ind
;
2215 case SCTP_PARAM_SUPPORTED_EXT
:
2216 sctp_process_ext_param(asoc
, param
);
2219 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2220 if (sctp_prsctp_enable
) {
2221 asoc
->peer
.prsctp_capable
= 1;
2226 /* Any unrecognized parameters should have been caught
2227 * and handled by sctp_verify_param() which should be
2228 * called prior to this routine. Simply log the error
2231 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2232 ntohs(param
.p
->type
), asoc
);
2239 /* Select a new verification tag. */
2240 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2242 /* I believe that this random number generator complies with RFC1750.
2243 * A tag of 0 is reserved for special cases (e.g. INIT).
2248 get_random_bytes(&x
, sizeof(__u32
));
2254 /* Select an initial TSN to send during startup. */
2255 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2259 get_random_bytes(&retval
, sizeof(__u32
));
2264 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2266 * 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
2267 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2268 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2269 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2271 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2272 * | Address Parameter |
2273 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2274 * | ASCONF Parameter #1 |
2275 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2279 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2280 * | ASCONF Parameter #N |
2281 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2283 * Address Parameter and other parameter will not be wrapped in this function
2285 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2286 union sctp_addr
*addr
,
2289 sctp_addiphdr_t asconf
;
2290 struct sctp_chunk
*retval
;
2291 int length
= sizeof(asconf
) + vparam_len
;
2292 union sctp_addr_param addrparam
;
2294 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2296 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2301 /* Create the chunk. */
2302 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF
, 0, length
);
2306 asconf
.serial
= htonl(asoc
->addip_serial
++);
2308 retval
->subh
.addip_hdr
=
2309 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2310 retval
->param_hdr
.v
=
2311 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2317 * 3.2.1 Add IP Address
2319 * 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
2320 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2321 * | Type = 0xC001 | Length = Variable |
2322 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2323 * | ASCONF-Request Correlation ID |
2324 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2325 * | Address Parameter |
2326 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2328 * 3.2.2 Delete IP Address
2330 * 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
2331 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2332 * | Type = 0xC002 | Length = Variable |
2333 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2334 * | ASCONF-Request Correlation ID |
2335 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2336 * | Address Parameter |
2337 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2340 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2341 union sctp_addr
*laddr
,
2342 struct sockaddr
*addrs
,
2346 sctp_addip_param_t param
;
2347 struct sctp_chunk
*retval
;
2348 union sctp_addr_param addr_param
;
2349 union sctp_addr
*addr
;
2352 int paramlen
= sizeof(param
);
2353 int addr_param_len
= 0;
2357 /* Get total length of all the address parameters. */
2359 for (i
= 0; i
< addrcnt
; i
++) {
2360 addr
= (union sctp_addr
*)addr_buf
;
2361 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2362 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2364 totallen
+= paramlen
;
2365 totallen
+= addr_param_len
;
2367 addr_buf
+= af
->sockaddr_len
;
2370 /* Create an asconf chunk with the required length. */
2371 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2375 /* Add the address parameters to the asconf chunk. */
2377 for (i
= 0; i
< addrcnt
; i
++) {
2378 addr
= (union sctp_addr
*)addr_buf
;
2379 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2380 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2381 param
.param_hdr
.type
= flags
;
2382 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2385 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2386 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2388 addr_buf
+= af
->sockaddr_len
;
2394 * 3.2.4 Set Primary IP Address
2396 * 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
2397 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2398 * | Type =0xC004 | Length = Variable |
2399 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2400 * | ASCONF-Request Correlation ID |
2401 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2402 * | Address Parameter |
2403 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2405 * Create an ASCONF chunk with Set Primary IP address parameter.
2407 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2408 union sctp_addr
*addr
)
2410 sctp_addip_param_t param
;
2411 struct sctp_chunk
*retval
;
2412 int len
= sizeof(param
);
2413 union sctp_addr_param addrparam
;
2415 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2417 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2422 /* Create the chunk and make asconf header. */
2423 retval
= sctp_make_asconf(asoc
, addr
, len
);
2427 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2428 param
.param_hdr
.length
= htons(len
);
2431 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2432 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2437 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2439 * 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
2440 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2441 * | Type = 0x80 | Chunk Flags | Chunk Length |
2442 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2444 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2445 * | ASCONF Parameter Response#1 |
2446 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2450 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2451 * | ASCONF Parameter Response#N |
2452 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2454 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2456 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2457 __u32 serial
, int vparam_len
)
2459 sctp_addiphdr_t asconf
;
2460 struct sctp_chunk
*retval
;
2461 int length
= sizeof(asconf
) + vparam_len
;
2463 /* Create the chunk. */
2464 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
);
2468 asconf
.serial
= htonl(serial
);
2470 retval
->subh
.addip_hdr
=
2471 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2476 /* Add response parameters to an ASCONF_ACK chunk. */
2477 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2478 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2480 sctp_addip_param_t ack_param
;
2481 sctp_errhdr_t err_param
;
2482 int asconf_param_len
= 0;
2483 int err_param_len
= 0;
2484 __be16 response_type
;
2486 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2487 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2489 response_type
= SCTP_PARAM_ERR_CAUSE
;
2490 err_param_len
= sizeof(err_param
);
2493 ntohs(asconf_param
->param_hdr
.length
);
2496 /* Add Success Indication or Error Cause Indication parameter. */
2497 ack_param
.param_hdr
.type
= response_type
;
2498 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2501 ack_param
.crr_id
= crr_id
;
2502 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2504 if (SCTP_ERROR_NO_ERROR
== err_code
)
2507 /* Add Error Cause parameter. */
2508 err_param
.cause
= err_code
;
2509 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2510 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2512 /* Add the failed TLV copied from ASCONF chunk. */
2514 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
2517 /* Process a asconf parameter. */
2518 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
2519 struct sctp_chunk
*asconf
,
2520 sctp_addip_param_t
*asconf_param
)
2522 struct sctp_transport
*peer
;
2524 union sctp_addr addr
;
2525 struct list_head
*pos
;
2526 union sctp_addr_param
*addr_param
;
2528 addr_param
= (union sctp_addr_param
*)
2529 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2531 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2533 return SCTP_ERROR_INV_PARAM
;
2535 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
2536 switch (asconf_param
->param_hdr
.type
) {
2537 case SCTP_PARAM_ADD_IP
:
2538 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
2539 * request and does not have the local resources to add this
2540 * new address to the association, it MUST return an Error
2541 * Cause TLV set to the new error code 'Operation Refused
2542 * Due to Resource Shortage'.
2545 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
2547 return SCTP_ERROR_RSRC_LOW
;
2549 /* Start the heartbeat timer. */
2550 if (!mod_timer(&peer
->hb_timer
, sctp_transport_timeout(peer
)))
2551 sctp_transport_hold(peer
);
2553 case SCTP_PARAM_DEL_IP
:
2554 /* ADDIP 4.3 D7) If a request is received to delete the
2555 * last remaining IP address of a peer endpoint, the receiver
2556 * MUST send an Error Cause TLV with the error cause set to the
2557 * new error code 'Request to Delete Last Remaining IP Address'.
2559 pos
= asoc
->peer
.transport_addr_list
.next
;
2560 if (pos
->next
== &asoc
->peer
.transport_addr_list
)
2561 return SCTP_ERROR_DEL_LAST_IP
;
2563 /* ADDIP 4.3 D8) If a request is received to delete an IP
2564 * address which is also the source address of the IP packet
2565 * which contained the ASCONF chunk, the receiver MUST reject
2566 * this request. To reject the request the receiver MUST send
2567 * an Error Cause TLV set to the new error code 'Request to
2568 * Delete Source IP Address'
2570 if (sctp_cmp_addr_exact(sctp_source(asconf
), &addr
))
2571 return SCTP_ERROR_DEL_SRC_IP
;
2573 sctp_assoc_del_peer(asoc
, &addr
);
2575 case SCTP_PARAM_SET_PRIMARY
:
2576 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2578 return SCTP_ERROR_INV_PARAM
;
2580 sctp_assoc_set_primary(asoc
, peer
);
2583 return SCTP_ERROR_INV_PARAM
;
2587 return SCTP_ERROR_NO_ERROR
;
2590 /* Verify the ASCONF packet before we process it. */
2591 int sctp_verify_asconf(const struct sctp_association
*asoc
,
2592 struct sctp_paramhdr
*param_hdr
, void *chunk_end
,
2593 struct sctp_paramhdr
**errp
) {
2594 sctp_addip_param_t
*asconf_param
;
2595 union sctp_params param
;
2598 param
.v
= (sctp_paramhdr_t
*) param_hdr
;
2599 while (param
.v
<= chunk_end
- sizeof(sctp_paramhdr_t
)) {
2600 length
= ntohs(param
.p
->length
);
2603 if (param
.v
> chunk_end
- length
||
2604 length
< sizeof(sctp_paramhdr_t
))
2607 switch (param
.p
->type
) {
2608 case SCTP_PARAM_ADD_IP
:
2609 case SCTP_PARAM_DEL_IP
:
2610 case SCTP_PARAM_SET_PRIMARY
:
2611 asconf_param
= (sctp_addip_param_t
*)param
.v
;
2612 plen
= ntohs(asconf_param
->param_hdr
.length
);
2613 if (plen
< sizeof(sctp_addip_param_t
) +
2614 sizeof(sctp_paramhdr_t
))
2617 case SCTP_PARAM_SUCCESS_REPORT
:
2618 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2619 if (length
!= sizeof(sctp_addip_param_t
))
2627 param
.v
+= WORD_ROUND(length
);
2630 if (param
.v
!= chunk_end
)
2636 /* Process an incoming ASCONF chunk with the next expected serial no. and
2637 * return an ASCONF_ACK chunk to be sent in response.
2639 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
2640 struct sctp_chunk
*asconf
)
2642 sctp_addiphdr_t
*hdr
;
2643 union sctp_addr_param
*addr_param
;
2644 sctp_addip_param_t
*asconf_param
;
2645 struct sctp_chunk
*asconf_ack
;
2649 int chunk_len
= asconf
->skb
->len
;
2651 int all_param_pass
= 1;
2653 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
2654 serial
= ntohl(hdr
->serial
);
2656 /* Skip the addiphdr and store a pointer to address parameter. */
2657 length
= sizeof(sctp_addiphdr_t
);
2658 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
2659 chunk_len
-= length
;
2661 /* Skip the address parameter and store a pointer to the first
2664 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
2665 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
2666 chunk_len
-= length
;
2668 /* create an ASCONF_ACK chunk.
2669 * Based on the definitions of parameters, we know that the size of
2670 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
2673 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 2);
2677 /* Process the TLVs contained within the ASCONF chunk. */
2678 while (chunk_len
> 0) {
2679 err_code
= sctp_process_asconf_param(asoc
, asconf
,
2682 * If an error response is received for a TLV parameter,
2683 * all TLVs with no response before the failed TLV are
2684 * considered successful if not reported. All TLVs after
2685 * the failed response are considered unsuccessful unless
2686 * a specific success indication is present for the parameter.
2688 if (SCTP_ERROR_NO_ERROR
!= err_code
)
2691 if (!all_param_pass
)
2692 sctp_add_asconf_response(asconf_ack
,
2693 asconf_param
->crr_id
, err_code
,
2696 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
2697 * an IP address sends an 'Out of Resource' in its response, it
2698 * MUST also fail any subsequent add or delete requests bundled
2701 if (SCTP_ERROR_RSRC_LOW
== err_code
)
2704 /* Move to the next ASCONF param. */
2705 length
= ntohs(asconf_param
->param_hdr
.length
);
2706 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
2708 chunk_len
-= length
;
2712 asoc
->peer
.addip_serial
++;
2714 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
2715 * after freeing the reference to old asconf ack if any.
2718 if (asoc
->addip_last_asconf_ack
)
2719 sctp_chunk_free(asoc
->addip_last_asconf_ack
);
2721 sctp_chunk_hold(asconf_ack
);
2722 asoc
->addip_last_asconf_ack
= asconf_ack
;
2728 /* Process a asconf parameter that is successfully acked. */
2729 static int sctp_asconf_param_success(struct sctp_association
*asoc
,
2730 sctp_addip_param_t
*asconf_param
)
2733 union sctp_addr addr
;
2734 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
2735 union sctp_addr_param
*addr_param
;
2736 struct list_head
*pos
;
2737 struct sctp_transport
*transport
;
2738 struct sctp_sockaddr_entry
*saddr
;
2741 addr_param
= (union sctp_addr_param
*)
2742 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2744 /* We have checked the packet before, so we do not check again. */
2745 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2746 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
2748 switch (asconf_param
->param_hdr
.type
) {
2749 case SCTP_PARAM_ADD_IP
:
2750 /* This is always done in BH context with a socket lock
2751 * held, so the list can not change.
2753 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
2754 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
2755 saddr
->use_as_src
= 1;
2758 case SCTP_PARAM_DEL_IP
:
2759 retval
= sctp_del_bind_addr(bp
, &addr
, call_rcu_bh
);
2760 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2761 transport
= list_entry(pos
, struct sctp_transport
,
2763 dst_release(transport
->dst
);
2764 sctp_transport_route(transport
, NULL
,
2765 sctp_sk(asoc
->base
.sk
));
2775 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
2776 * for the given asconf parameter. If there is no response for this parameter,
2777 * return the error code based on the third argument 'no_err'.
2779 * A7) If an error response is received for a TLV parameter, all TLVs with no
2780 * response before the failed TLV are considered successful if not reported.
2781 * All TLVs after the failed response are considered unsuccessful unless a
2782 * specific success indication is present for the parameter.
2784 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
2785 sctp_addip_param_t
*asconf_param
,
2788 sctp_addip_param_t
*asconf_ack_param
;
2789 sctp_errhdr_t
*err_param
;
2791 int asconf_ack_len
= asconf_ack
->skb
->len
;
2795 err_code
= SCTP_ERROR_NO_ERROR
;
2797 err_code
= SCTP_ERROR_REQ_REFUSED
;
2799 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
2800 * the first asconf_ack parameter.
2802 length
= sizeof(sctp_addiphdr_t
);
2803 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
2805 asconf_ack_len
-= length
;
2807 while (asconf_ack_len
> 0) {
2808 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
2809 switch(asconf_ack_param
->param_hdr
.type
) {
2810 case SCTP_PARAM_SUCCESS_REPORT
:
2811 return SCTP_ERROR_NO_ERROR
;
2812 case SCTP_PARAM_ERR_CAUSE
:
2813 length
= sizeof(sctp_addip_param_t
);
2814 err_param
= (sctp_errhdr_t
*)
2815 ((void *)asconf_ack_param
+ length
);
2816 asconf_ack_len
-= length
;
2817 if (asconf_ack_len
> 0)
2818 return err_param
->cause
;
2820 return SCTP_ERROR_INV_PARAM
;
2823 return SCTP_ERROR_INV_PARAM
;
2827 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
2828 asconf_ack_param
= (sctp_addip_param_t
*)
2829 ((void *)asconf_ack_param
+ length
);
2830 asconf_ack_len
-= length
;
2836 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
2837 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
2838 struct sctp_chunk
*asconf_ack
)
2840 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
2841 union sctp_addr_param
*addr_param
;
2842 sctp_addip_param_t
*asconf_param
;
2844 int asconf_len
= asconf
->skb
->len
;
2845 int all_param_pass
= 0;
2848 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
2850 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
2851 * a pointer to address parameter.
2853 length
= sizeof(sctp_addip_chunk_t
);
2854 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
2855 asconf_len
-= length
;
2857 /* Skip the address parameter in the last asconf sent and store a
2858 * pointer to the first asconf paramter.
2860 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
2861 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
2862 asconf_len
-= length
;
2865 * A8) If there is no response(s) to specific TLV parameter(s), and no
2866 * failures are indicated, then all request(s) are considered
2869 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
2872 /* Process the TLVs contained in the last sent ASCONF chunk. */
2873 while (asconf_len
> 0) {
2875 err_code
= SCTP_ERROR_NO_ERROR
;
2877 err_code
= sctp_get_asconf_response(asconf_ack
,
2880 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
2885 case SCTP_ERROR_NO_ERROR
:
2886 retval
= sctp_asconf_param_success(asoc
, asconf_param
);
2889 case SCTP_ERROR_RSRC_LOW
:
2893 case SCTP_ERROR_INV_PARAM
:
2894 /* Disable sending this type of asconf parameter in
2897 asoc
->peer
.addip_disabled_mask
|=
2898 asconf_param
->param_hdr
.type
;
2901 case SCTP_ERROR_REQ_REFUSED
:
2902 case SCTP_ERROR_DEL_LAST_IP
:
2903 case SCTP_ERROR_DEL_SRC_IP
:
2908 /* Skip the processed asconf parameter and move to the next
2911 length
= ntohs(asconf_param
->param_hdr
.length
);
2912 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
2914 asconf_len
-= length
;
2917 /* Free the cached last sent asconf chunk. */
2918 sctp_chunk_free(asconf
);
2919 asoc
->addip_last_asconf
= NULL
;
2921 /* Send the next asconf chunk from the addip chunk queue. */
2922 if (!list_empty(&asoc
->addip_chunk_list
)) {
2923 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
2924 asconf
= list_entry(entry
, struct sctp_chunk
, list
);
2926 list_del_init(entry
);
2928 /* Hold the chunk until an ASCONF_ACK is received. */
2929 sctp_chunk_hold(asconf
);
2930 if (sctp_primitive_ASCONF(asoc
, asconf
))
2931 sctp_chunk_free(asconf
);
2933 asoc
->addip_last_asconf
= asconf
;
2939 /* Make a FWD TSN chunk. */
2940 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
2941 __u32 new_cum_tsn
, size_t nstreams
,
2942 struct sctp_fwdtsn_skip
*skiplist
)
2944 struct sctp_chunk
*retval
= NULL
;
2945 struct sctp_fwdtsn_chunk
*ftsn_chunk
;
2946 struct sctp_fwdtsn_hdr ftsn_hdr
;
2947 struct sctp_fwdtsn_skip skip
;
2951 hint
= (nstreams
+ 1) * sizeof(__u32
);
2953 retval
= sctp_make_chunk(asoc
, SCTP_CID_FWD_TSN
, 0, hint
);
2958 ftsn_chunk
= (struct sctp_fwdtsn_chunk
*)retval
->subh
.fwdtsn_hdr
;
2960 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
2961 retval
->subh
.fwdtsn_hdr
=
2962 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
2964 for (i
= 0; i
< nstreams
; i
++) {
2965 skip
.stream
= skiplist
[i
].stream
;
2966 skip
.ssn
= skiplist
[i
].ssn
;
2967 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);