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>
68 extern kmem_cache_t
*sctp_chunk_cachep
;
71 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
72 __u8 type
, __u8 flags
, int paylen
);
73 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
74 const struct sctp_association
*asoc
,
75 const struct sctp_chunk
*init_chunk
,
77 const __u8
*raw_addrs
, int addrs_len
);
78 static int sctp_process_param(struct sctp_association
*asoc
,
79 union sctp_params param
,
80 const union sctp_addr
*peer_addr
,
83 /* What was the inbound interface for this chunk? */
84 int sctp_chunk_iif(const struct sctp_chunk
*chunk
)
89 af
= sctp_get_af_specific(ipver2af(chunk
->skb
->nh
.iph
->version
));
91 iif
= af
->skb_iif(chunk
->skb
);
96 /* RFC 2960 3.3.2 Initiation (INIT) (1)
98 * Note 2: The ECN capable field is reserved for future use of
99 * Explicit Congestion Notification.
101 static const struct sctp_paramhdr ecap_param
= {
102 SCTP_PARAM_ECN_CAPABLE
,
103 __constant_htons(sizeof(struct sctp_paramhdr
)),
105 static const struct sctp_paramhdr prsctp_param
= {
106 SCTP_PARAM_FWD_TSN_SUPPORT
,
107 __constant_htons(sizeof(struct sctp_paramhdr
)),
110 /* A helper to initialize to initialize an op error inside a
111 * provided chunk, as most cause codes will be embedded inside an
114 void sctp_init_cause(struct sctp_chunk
*chunk
, __u16 cause_code
,
115 const void *payload
, size_t paylen
)
121 /* Cause code constants are now defined in network order. */
122 err
.cause
= cause_code
;
123 len
= sizeof(sctp_errhdr_t
) + paylen
;
125 err
.length
= htons(len
);
127 sctp_addto_chunk(chunk
, sizeof(sctp_errhdr_t
), &err
);
128 chunk
->subh
.err_hdr
= sctp_addto_chunk(chunk
, paylen
, payload
);
131 /* 3.3.2 Initiation (INIT) (1)
133 * This chunk is used to initiate a SCTP association between two
134 * endpoints. The format of the INIT chunk is shown below:
137 * 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
138 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
139 * | Type = 1 | Chunk Flags | Chunk Length |
140 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
142 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
143 * | Advertised Receiver Window Credit (a_rwnd) |
144 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
145 * | Number of Outbound Streams | Number of Inbound Streams |
146 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
148 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
150 * / Optional/Variable-Length Parameters /
152 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
155 * The INIT chunk contains the following parameters. Unless otherwise
156 * noted, each parameter MUST only be included once in the INIT chunk.
158 * Fixed Parameters Status
159 * ----------------------------------------------
160 * Initiate Tag Mandatory
161 * Advertised Receiver Window Credit Mandatory
162 * Number of Outbound Streams Mandatory
163 * Number of Inbound Streams Mandatory
164 * Initial TSN Mandatory
166 * Variable Parameters Status Type Value
167 * -------------------------------------------------------------
168 * IPv4 Address (Note 1) Optional 5
169 * IPv6 Address (Note 1) Optional 6
170 * Cookie Preservative Optional 9
171 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
172 * Host Name Address (Note 3) Optional 11
173 * Supported Address Types (Note 4) Optional 12
175 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
176 const struct sctp_bind_addr
*bp
,
177 int gfp
, int vparam_len
)
180 union sctp_params addrs
;
182 struct sctp_chunk
*retval
= NULL
;
183 int num_types
, addrs_len
= 0;
184 struct sctp_sock
*sp
;
185 sctp_supported_addrs_param_t sat
;
187 sctp_adaption_ind_param_t aiparam
;
189 /* RFC 2960 3.3.2 Initiation (INIT) (1)
191 * Note 1: The INIT chunks can contain multiple addresses that
192 * can be IPv4 and/or IPv6 in any combination.
196 /* Convert the provided bind address list to raw format. */
197 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
199 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
200 init
.a_rwnd
= htonl(asoc
->rwnd
);
201 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
202 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
203 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
205 /* How many address types are needed? */
206 sp
= sctp_sk(asoc
->base
.sk
);
207 num_types
= sp
->pf
->supported_addrs(sp
, types
);
209 chunksize
= sizeof(init
) + addrs_len
+ SCTP_SAT_LEN(num_types
);
210 chunksize
+= sizeof(ecap_param
);
211 if (sctp_prsctp_enable
)
212 chunksize
+= sizeof(prsctp_param
);
213 chunksize
+= sizeof(aiparam
);
214 chunksize
+= vparam_len
;
216 /* RFC 2960 3.3.2 Initiation (INIT) (1)
218 * Note 3: An INIT chunk MUST NOT contain more than one Host
219 * Name address parameter. Moreover, the sender of the INIT
220 * MUST NOT combine any other address types with the Host Name
221 * address in the INIT. The receiver of INIT MUST ignore any
222 * other address types if the Host Name address parameter is
223 * present in the received INIT chunk.
225 * PLEASE DO NOT FIXME [This version does not support Host Name.]
228 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT
, 0, chunksize
);
232 retval
->subh
.init_hdr
=
233 sctp_addto_chunk(retval
, sizeof(init
), &init
);
234 retval
->param_hdr
.v
=
235 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
237 /* RFC 2960 3.3.2 Initiation (INIT) (1)
239 * Note 4: This parameter, when present, specifies all the
240 * address types the sending endpoint can support. The absence
241 * of this parameter indicates that the sending endpoint can
242 * support any address type.
244 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
245 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
246 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
247 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
249 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
250 if (sctp_prsctp_enable
)
251 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
252 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTION_LAYER_IND
;
253 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
254 aiparam
.adaption_ind
= htonl(sp
->adaption_ind
);
255 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
262 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
263 const struct sctp_chunk
*chunk
,
264 int gfp
, int unkparam_len
)
266 sctp_inithdr_t initack
;
267 struct sctp_chunk
*retval
;
268 union sctp_params addrs
;
270 sctp_cookie_param_t
*cookie
;
273 sctp_adaption_ind_param_t aiparam
;
277 /* Note: there may be no addresses to embed. */
278 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
280 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
281 initack
.a_rwnd
= htonl(asoc
->rwnd
);
282 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
283 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
284 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
286 /* FIXME: We really ought to build the cookie right
287 * into the packet instead of allocating more fresh memory.
289 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
294 /* Calculate the total size of allocation, include the reserved
295 * space for reporting unknown parameters if it is specified.
297 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
299 /* Tell peer that we'll do ECN only if peer advertised such cap. */
300 if (asoc
->peer
.ecn_capable
)
301 chunksize
+= sizeof(ecap_param
);
303 /* Tell peer that we'll do PR-SCTP only if peer advertised. */
304 if (asoc
->peer
.prsctp_capable
)
305 chunksize
+= sizeof(prsctp_param
);
307 chunksize
+= sizeof(aiparam
);
309 /* Now allocate and fill out the chunk. */
310 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
);
314 /* Per the advice in RFC 2960 6.4, send this reply to
315 * the source of the INIT packet.
317 retval
->transport
= chunk
->transport
;
318 retval
->subh
.init_hdr
=
319 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
320 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
321 sctp_addto_chunk(retval
, cookie_len
, cookie
);
322 if (asoc
->peer
.ecn_capable
)
323 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
324 if (asoc
->peer
.prsctp_capable
)
325 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
327 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTION_LAYER_IND
;
328 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
329 aiparam
.adaption_ind
= htonl(sctp_sk(asoc
->base
.sk
)->adaption_ind
);
330 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
332 /* We need to remove the const qualifier at this point. */
333 retval
->asoc
= (struct sctp_association
*) asoc
;
335 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
337 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
338 * HEARTBEAT ACK, * etc.) to the same destination transport
339 * address from which it received the DATA or control chunk
340 * to which it is replying.
342 * [INIT ACK back to where the INIT came from.]
345 retval
->transport
= chunk
->transport
;
355 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
357 * This chunk is used only during the initialization of an association.
358 * It is sent by the initiator of an association to its peer to complete
359 * the initialization process. This chunk MUST precede any DATA chunk
360 * sent within the association, but MAY be bundled with one or more DATA
361 * chunks in the same packet.
364 * 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
365 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
366 * | Type = 10 |Chunk Flags | Length |
367 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
370 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
374 * Set to zero on transmit and ignored on receipt.
376 * Length: 16 bits (unsigned integer)
378 * Set to the size of the chunk in bytes, including the 4 bytes of
379 * the chunk header and the size of the Cookie.
381 * Cookie: variable size
383 * This field must contain the exact cookie received in the
384 * State Cookie parameter from the previous INIT ACK.
386 * An implementation SHOULD make the cookie as small as possible
387 * to insure interoperability.
389 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
390 const struct sctp_chunk
*chunk
)
392 struct sctp_chunk
*retval
;
396 cookie
= asoc
->peer
.cookie
;
397 cookie_len
= asoc
->peer
.cookie_len
;
399 /* Build a cookie echo chunk. */
400 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ECHO
, 0, cookie_len
);
403 retval
->subh
.cookie_hdr
=
404 sctp_addto_chunk(retval
, cookie_len
, cookie
);
406 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
408 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
409 * HEARTBEAT ACK, * etc.) to the same destination transport
410 * address from which it * received the DATA or control chunk
411 * to which it is replying.
413 * [COOKIE ECHO back to where the INIT ACK came from.]
416 retval
->transport
= chunk
->transport
;
422 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
424 * This chunk is used only during the initialization of an
425 * association. It is used to acknowledge the receipt of a COOKIE
426 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
427 * within the association, but MAY be bundled with one or more DATA
428 * chunks or SACK chunk in the same SCTP packet.
431 * 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
432 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
433 * | Type = 11 |Chunk Flags | Length = 4 |
434 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
436 * Chunk Flags: 8 bits
438 * Set to zero on transmit and ignored on receipt.
440 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
441 const struct sctp_chunk
*chunk
)
443 struct sctp_chunk
*retval
;
445 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0);
447 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
449 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
450 * HEARTBEAT ACK, * etc.) to the same destination transport
451 * address from which it * received the DATA or control chunk
452 * to which it is replying.
454 * [COOKIE ACK back to where the COOKIE ECHO came from.]
457 retval
->transport
= chunk
->transport
;
463 * Appendix A: Explicit Congestion Notification:
466 * RFC 2481 details a specific bit for a sender to send in the header of
467 * its next outbound TCP segment to indicate to its peer that it has
468 * reduced its congestion window. This is termed the CWR bit. For
469 * SCTP the same indication is made by including the CWR chunk.
470 * This chunk contains one data element, i.e. the TSN number that
471 * was sent in the ECNE chunk. This element represents the lowest
472 * TSN number in the datagram that was originally marked with the
476 * 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
477 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
478 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
479 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
480 * | Lowest TSN Number |
481 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
483 * Note: The CWR is considered a Control chunk.
485 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
486 const __u32 lowest_tsn
,
487 const struct sctp_chunk
*chunk
)
489 struct sctp_chunk
*retval
;
492 cwr
.lowest_tsn
= htonl(lowest_tsn
);
493 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_CWR
, 0,
494 sizeof(sctp_cwrhdr_t
));
499 retval
->subh
.ecn_cwr_hdr
=
500 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
502 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
504 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
505 * HEARTBEAT ACK, * etc.) to the same destination transport
506 * address from which it * received the DATA or control chunk
507 * to which it is replying.
509 * [Report a reduced congestion window back to where the ECNE
513 retval
->transport
= chunk
->transport
;
519 /* Make an ECNE chunk. This is a congestion experienced report. */
520 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
521 const __u32 lowest_tsn
)
523 struct sctp_chunk
*retval
;
526 ecne
.lowest_tsn
= htonl(lowest_tsn
);
527 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_ECNE
, 0,
528 sizeof(sctp_ecnehdr_t
));
531 retval
->subh
.ecne_hdr
=
532 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
538 /* Make a DATA chunk for the given association from the provided
539 * parameters. However, do not populate the data payload.
541 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
542 const struct sctp_sndrcvinfo
*sinfo
,
543 int data_len
, __u8 flags
, __u16 ssn
)
545 struct sctp_chunk
*retval
;
546 struct sctp_datahdr dp
;
549 /* We assign the TSN as LATE as possible, not here when
550 * creating the chunk.
553 dp
.stream
= htons(sinfo
->sinfo_stream
);
554 dp
.ppid
= sinfo
->sinfo_ppid
;
556 /* Set the flags for an unordered send. */
557 if (sinfo
->sinfo_flags
& MSG_UNORDERED
) {
558 flags
|= SCTP_DATA_UNORDERED
;
563 chunk_len
= sizeof(dp
) + data_len
;
564 retval
= sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, chunk_len
);
568 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
569 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
575 /* Create a selective ackowledgement (SACK) for the given
576 * association. This reports on which TSN's we've seen to date,
577 * including duplicates and gaps.
579 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
581 struct sctp_chunk
*retval
;
582 struct sctp_sackhdr sack
;
585 __u16 num_gabs
, num_dup_tsns
;
586 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
588 ctsn
= sctp_tsnmap_get_ctsn(map
);
589 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn
);
591 /* How much room is needed in the chunk? */
592 num_gabs
= sctp_tsnmap_num_gabs(map
);
593 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
595 /* Initialize the SACK header. */
596 sack
.cum_tsn_ack
= htonl(ctsn
);
597 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
598 sack
.num_gap_ack_blocks
= htons(num_gabs
);
599 sack
.num_dup_tsns
= htons(num_dup_tsns
);
602 + sizeof(struct sctp_gap_ack_block
) * num_gabs
603 + sizeof(__u32
) * num_dup_tsns
;
605 /* Create the chunk. */
606 retval
= sctp_make_chunk(asoc
, SCTP_CID_SACK
, 0, len
);
610 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
612 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
613 * HEARTBEAT ACK, etc.) to the same destination transport
614 * address from which it received the DATA or control chunk to
615 * which it is replying. This rule should also be followed if
616 * the endpoint is bundling DATA chunks together with the
619 * However, when acknowledging multiple DATA chunks received
620 * in packets from different source addresses in a single
621 * SACK, the SACK chunk may be transmitted to one of the
622 * destination transport addresses from which the DATA or
623 * control chunks being acknowledged were received.
625 * [BUG: We do not implement the following paragraph.
626 * Perhaps we should remember the last transport we used for a
627 * SACK and avoid that (if possible) if we have seen any
628 * duplicates. --piggy]
630 * When a receiver of a duplicate DATA chunk sends a SACK to a
631 * multi- homed endpoint it MAY be beneficial to vary the
632 * destination address and not use the source address of the
633 * DATA chunk. The reason being that receiving a duplicate
634 * from a multi-homed endpoint might indicate that the return
635 * path (as specified in the source address of the DATA chunk)
636 * for the SACK is broken.
638 * [Send to the address from which we last received a DATA chunk.]
640 retval
->transport
= asoc
->peer
.last_data_from
;
642 retval
->subh
.sack_hdr
=
643 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
645 /* Add the gap ack block information. */
647 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
648 sctp_tsnmap_get_gabs(map
));
650 /* Add the duplicate TSN information. */
652 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
653 sctp_tsnmap_get_dups(map
));
659 /* Make a SHUTDOWN chunk. */
660 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
661 const struct sctp_chunk
*chunk
)
663 struct sctp_chunk
*retval
;
664 sctp_shutdownhdr_t shut
;
667 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
668 shut
.cum_tsn_ack
= htonl(ctsn
);
670 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN
, 0,
671 sizeof(sctp_shutdownhdr_t
));
675 retval
->subh
.shutdown_hdr
=
676 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
679 retval
->transport
= chunk
->transport
;
684 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
685 const struct sctp_chunk
*chunk
)
687 struct sctp_chunk
*retval
;
689 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0);
691 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
693 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
694 * HEARTBEAT ACK, * etc.) to the same destination transport
695 * address from which it * received the DATA or control chunk
696 * to which it is replying.
698 * [ACK back to where the SHUTDOWN came from.]
701 retval
->transport
= chunk
->transport
;
706 struct sctp_chunk
*sctp_make_shutdown_complete(
707 const struct sctp_association
*asoc
,
708 const struct sctp_chunk
*chunk
)
710 struct sctp_chunk
*retval
;
713 /* Maybe set the T-bit if we have no association. */
714 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
716 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
, 0);
718 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
720 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
721 * HEARTBEAT ACK, * etc.) to the same destination transport
722 * address from which it * received the DATA or control chunk
723 * to which it is replying.
725 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
729 retval
->transport
= chunk
->transport
;
734 /* Create an ABORT. Note that we set the T bit if we have no
737 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
738 const struct sctp_chunk
*chunk
,
741 struct sctp_chunk
*retval
;
744 /* Maybe set the T-bit if we have no association. */
745 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
747 retval
= sctp_make_chunk(asoc
, SCTP_CID_ABORT
, flags
, hint
);
749 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
751 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
752 * HEARTBEAT ACK, * etc.) to the same destination transport
753 * address from which it * received the DATA or control chunk
754 * to which it is replying.
756 * [ABORT back to where the offender came from.]
759 retval
->transport
= chunk
->transport
;
764 /* Helper to create ABORT with a NO_USER_DATA error. */
765 struct sctp_chunk
*sctp_make_abort_no_data(
766 const struct sctp_association
*asoc
,
767 const struct sctp_chunk
*chunk
, __u32 tsn
)
769 struct sctp_chunk
*retval
;
772 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
778 /* Put the tsn back into network byte order. */
779 payload
= htonl(tsn
);
780 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, (const void *)&payload
,
783 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
785 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
786 * HEARTBEAT ACK, * etc.) to the same destination transport
787 * address from which it * received the DATA or control chunk
788 * to which it is replying.
790 * [ABORT back to where the offender came from.]
793 retval
->transport
= chunk
->transport
;
799 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
800 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
801 const struct sctp_chunk
*chunk
,
802 const struct msghdr
*msg
)
804 struct sctp_chunk
*retval
;
805 void *payload
= NULL
, *payoff
;
807 struct iovec
*iov
= NULL
;
812 iovlen
= msg
->msg_iovlen
;
813 paylen
= get_user_iov_size(iov
, iovlen
);
816 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
);
821 /* Put the msg_iov together into payload. */
822 payload
= kmalloc(paylen
, GFP_ATOMIC
);
827 for (; iovlen
> 0; --iovlen
) {
828 if (copy_from_user(payoff
, iov
->iov_base
,iov
->iov_len
))
830 payoff
+= iov
->iov_len
;
835 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, payload
, paylen
);
845 sctp_chunk_free(retval
);
851 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
852 struct sctp_chunk
*sctp_make_abort_violation(
853 const struct sctp_association
*asoc
,
854 const struct sctp_chunk
*chunk
,
858 struct sctp_chunk
*retval
;
859 struct sctp_paramhdr phdr
;
861 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
862 + sizeof(sctp_chunkhdr_t
));
866 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, payload
, paylen
);
868 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
869 phdr
.length
= chunk
->chunk_hdr
->length
;
870 sctp_addto_chunk(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
876 /* Make a HEARTBEAT chunk. */
877 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
878 const struct sctp_transport
*transport
,
879 const void *payload
, const size_t paylen
)
881 struct sctp_chunk
*retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT
,
887 /* Cast away the 'const', as this is just telling the chunk
888 * what transport it belongs to.
890 retval
->transport
= (struct sctp_transport
*) transport
;
891 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
897 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
898 const struct sctp_chunk
*chunk
,
899 const void *payload
, const size_t paylen
)
901 struct sctp_chunk
*retval
;
903 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
);
907 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
909 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
911 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
912 * HEARTBEAT ACK, * etc.) to the same destination transport
913 * address from which it * received the DATA or control chunk
914 * to which it is replying.
916 * [HBACK back to where the HEARTBEAT came from.]
919 retval
->transport
= chunk
->transport
;
925 /* Create an Operation Error chunk with the specified space reserved.
926 * This routine can be used for containing multiple causes in the chunk.
928 static struct sctp_chunk
*sctp_make_op_error_space(
929 const struct sctp_association
*asoc
,
930 const struct sctp_chunk
*chunk
,
933 struct sctp_chunk
*retval
;
935 retval
= sctp_make_chunk(asoc
, SCTP_CID_ERROR
, 0,
936 sizeof(sctp_errhdr_t
) + size
);
940 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
942 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
943 * HEARTBEAT ACK, etc.) to the same destination transport
944 * address from which it received the DATA or control chunk
945 * to which it is replying.
949 retval
->transport
= chunk
->transport
;
955 /* Create an Operation Error chunk. */
956 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
957 const struct sctp_chunk
*chunk
,
958 __u16 cause_code
, const void *payload
,
961 struct sctp_chunk
*retval
;
963 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
);
967 sctp_init_cause(retval
, cause_code
, payload
, paylen
);
973 /********************************************************************
974 * 2nd Level Abstractions
975 ********************************************************************/
977 /* Turn an skb into a chunk.
978 * FIXME: Eventually move the structure directly inside the skb->cb[].
980 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
981 const struct sctp_association
*asoc
,
984 struct sctp_chunk
*retval
;
986 retval
= kmem_cache_alloc(sctp_chunk_cachep
, SLAB_ATOMIC
);
990 memset(retval
, 0, sizeof(struct sctp_chunk
));
993 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb
);
997 retval
->asoc
= (struct sctp_association
*)asoc
;
1000 retval
->has_ssn
= 0;
1001 retval
->rtt_in_progress
= 0;
1002 retval
->sent_at
= 0;
1003 retval
->singleton
= 1;
1004 retval
->end_of_packet
= 0;
1005 retval
->ecn_ce_done
= 0;
1006 retval
->pdiscard
= 0;
1008 /* sctpimpguide-05.txt Section 2.8.2
1009 * M1) Each time a new DATA chunk is transmitted
1010 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1011 * 'TSN.Missing.Report' count will be used to determine missing chunks
1012 * and when to fast retransmit.
1014 retval
->tsn_missing_report
= 0;
1015 retval
->tsn_gap_acked
= 0;
1016 retval
->fast_retransmit
= 0;
1018 /* If this is a fragmented message, track all fragments
1019 * of the message (for SEND_FAILED).
1023 /* Polish the bead hole. */
1024 INIT_LIST_HEAD(&retval
->transmitted_list
);
1025 INIT_LIST_HEAD(&retval
->frag_list
);
1026 SCTP_DBG_OBJCNT_INC(chunk
);
1027 atomic_set(&retval
->refcnt
, 1);
1033 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1034 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1035 union sctp_addr
*dest
)
1037 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1038 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1041 /* Extract the source address from a chunk. */
1042 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1044 /* If we have a known transport, use that. */
1045 if (chunk
->transport
) {
1046 return &chunk
->transport
->ipaddr
;
1048 /* Otherwise, extract it from the IP header. */
1049 return &chunk
->source
;
1053 /* Create a new chunk, setting the type and flags headers from the
1054 * arguments, reserving enough space for a 'paylen' byte payload.
1057 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
1058 __u8 type
, __u8 flags
, int paylen
)
1060 struct sctp_chunk
*retval
;
1061 sctp_chunkhdr_t
*chunk_hdr
;
1062 struct sk_buff
*skb
;
1065 /* No need to allocate LL here, as this is only a chunk. */
1066 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
),
1071 /* Make room for the chunk header. */
1072 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1073 chunk_hdr
->type
= type
;
1074 chunk_hdr
->flags
= flags
;
1075 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1077 sk
= asoc
? asoc
->base
.sk
: NULL
;
1078 retval
= sctp_chunkify(skb
, asoc
, sk
);
1084 retval
->chunk_hdr
= chunk_hdr
;
1085 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1087 /* Set the skb to the belonging sock for accounting. */
1096 /* Release the memory occupied by a chunk. */
1097 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1099 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1100 dev_kfree_skb(chunk
->skb
);
1102 SCTP_DBG_OBJCNT_DEC(chunk
);
1103 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1106 /* Possibly, free the chunk. */
1107 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1109 /* Make sure that we are not on any list. */
1110 skb_unlink((struct sk_buff
*) chunk
);
1111 list_del_init(&chunk
->transmitted_list
);
1113 /* Release our reference on the message tracker. */
1115 sctp_datamsg_put(chunk
->msg
);
1117 sctp_chunk_put(chunk
);
1120 /* Grab a reference to the chunk. */
1121 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1123 atomic_inc(&ch
->refcnt
);
1126 /* Release a reference to the chunk. */
1127 void sctp_chunk_put(struct sctp_chunk
*ch
)
1129 if (atomic_dec_and_test(&ch
->refcnt
))
1130 sctp_chunk_destroy(ch
);
1133 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1136 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1140 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1141 int padlen
= chunklen
% 4;
1143 padding
= skb_put(chunk
->skb
, padlen
);
1144 target
= skb_put(chunk
->skb
, len
);
1146 memset(padding
, 0, padlen
);
1147 memcpy(target
, data
, len
);
1149 /* Adjust the chunk length field. */
1150 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1151 chunk
->chunk_end
= chunk
->skb
->tail
;
1156 /* Append bytes from user space to the end of a chunk. Will panic if
1157 * chunk is not big enough.
1158 * Returns a kernel err value.
1160 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int off
, int len
,
1166 /* Make room in chunk for data. */
1167 target
= skb_put(chunk
->skb
, len
);
1169 /* Copy data (whole iovec) into chunk */
1170 if ((err
= memcpy_fromiovecend(target
, data
, off
, len
)))
1173 /* Adjust the chunk length field. */
1174 chunk
->chunk_hdr
->length
=
1175 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1176 chunk
->chunk_end
= chunk
->skb
->tail
;
1182 /* Helper function to assign a TSN if needed. This assumes that both
1183 * the data_hdr and association have already been assigned.
1185 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1193 /* This is the last possible instant to assign a SSN. */
1194 if (chunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1197 sid
= htons(chunk
->subh
.data_hdr
->stream
);
1198 if (chunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1199 ssn
= sctp_ssn_next(&chunk
->asoc
->ssnmap
->out
, sid
);
1201 ssn
= sctp_ssn_peek(&chunk
->asoc
->ssnmap
->out
, sid
);
1205 chunk
->subh
.data_hdr
->ssn
= ssn
;
1209 /* Helper function to assign a TSN if needed. This assumes that both
1210 * the data_hdr and association have already been assigned.
1212 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1214 if (!chunk
->has_tsn
) {
1215 /* This is the last possible instant to
1218 chunk
->subh
.data_hdr
->tsn
=
1219 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1224 /* Create a CLOSED association to use with an incoming packet. */
1225 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1226 struct sctp_chunk
*chunk
, int gfp
)
1228 struct sctp_association
*asoc
;
1229 struct sk_buff
*skb
;
1233 /* Create the bare association. */
1234 scope
= sctp_scope(sctp_source(chunk
));
1235 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1240 /* Create an entry for the source address of the packet. */
1241 af
= sctp_get_af_specific(ipver2af(skb
->nh
.iph
->version
));
1244 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1249 sctp_association_free(asoc
);
1253 /* Build a cookie representing asoc.
1254 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1256 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1257 const struct sctp_association
*asoc
,
1258 const struct sctp_chunk
*init_chunk
,
1260 const __u8
*raw_addrs
, int addrs_len
)
1262 sctp_cookie_param_t
*retval
;
1263 struct sctp_signed_cookie
*cookie
;
1264 struct scatterlist sg
;
1265 int headersize
, bodysize
;
1266 unsigned int keylen
;
1269 headersize
= sizeof(sctp_paramhdr_t
) + SCTP_SECRET_SIZE
;
1270 bodysize
= sizeof(struct sctp_cookie
)
1271 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1273 /* Pad out the cookie to a multiple to make the signature
1274 * functions simpler to write.
1276 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1277 bodysize
+= SCTP_COOKIE_MULTIPLE
1278 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1279 *cookie_len
= headersize
+ bodysize
;
1281 retval
= (sctp_cookie_param_t
*)kmalloc(*cookie_len
, GFP_ATOMIC
);
1288 /* Clear this memory since we are sending this data structure
1289 * out on the network.
1291 memset(retval
, 0x00, *cookie_len
);
1292 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1294 /* Set up the parameter header. */
1295 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1296 retval
->p
.length
= htons(*cookie_len
);
1298 /* Copy the cookie part of the association itself. */
1299 cookie
->c
= asoc
->c
;
1300 /* Save the raw address list length in the cookie. */
1301 cookie
->c
.raw_addr_list_len
= addrs_len
;
1303 /* Remember PR-SCTP capability. */
1304 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1306 /* Save adaption indication in the cookie. */
1307 cookie
->c
.adaption_ind
= asoc
->peer
.adaption_ind
;
1309 /* Set an expiration time for the cookie. */
1310 do_gettimeofday(&cookie
->c
.expiration
);
1311 TIMEVAL_ADD(asoc
->cookie_life
, cookie
->c
.expiration
);
1313 /* Copy the peer's init packet. */
1314 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1315 ntohs(init_chunk
->chunk_hdr
->length
));
1317 /* Copy the raw local address list of the association. */
1318 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1319 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1321 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1322 /* Sign the message. */
1323 sg
.page
= virt_to_page(&cookie
->c
);
1324 sg
.offset
= (unsigned long)(&cookie
->c
) % PAGE_SIZE
;
1325 sg
.length
= bodysize
;
1326 keylen
= SCTP_SECRET_SIZE
;
1327 key
= (char *)ep
->secret_key
[ep
->current_key
];
1329 sctp_crypto_hmac(sctp_sk(ep
->base
.sk
)->hmac
, key
, &keylen
,
1330 &sg
, 1, cookie
->signature
);
1337 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1338 struct sctp_association
*sctp_unpack_cookie(
1339 const struct sctp_endpoint
*ep
,
1340 const struct sctp_association
*asoc
,
1341 struct sctp_chunk
*chunk
, int gfp
,
1342 int *error
, struct sctp_chunk
**errp
)
1344 struct sctp_association
*retval
= NULL
;
1345 struct sctp_signed_cookie
*cookie
;
1346 struct sctp_cookie
*bear_cookie
;
1347 int headersize
, bodysize
, fixed_size
;
1348 __u8 digest
[SCTP_SIGNATURE_SIZE
];
1349 struct scatterlist sg
;
1350 unsigned int keylen
, len
;
1353 struct sk_buff
*skb
= chunk
->skb
;
1355 headersize
= sizeof(sctp_chunkhdr_t
) + SCTP_SECRET_SIZE
;
1356 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1357 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1359 /* Verify that the chunk looks like it even has a cookie.
1360 * There must be enough room for our cookie and our peer's
1363 len
= ntohs(chunk
->chunk_hdr
->length
);
1364 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1367 /* Verify that the cookie has been padded out. */
1368 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1371 /* Process the cookie. */
1372 cookie
= chunk
->subh
.cookie_hdr
;
1373 bear_cookie
= &cookie
->c
;
1375 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1378 /* Check the signature. */
1379 keylen
= SCTP_SECRET_SIZE
;
1380 sg
.page
= virt_to_page(bear_cookie
);
1381 sg
.offset
= (unsigned long)(bear_cookie
) % PAGE_SIZE
;
1382 sg
.length
= bodysize
;
1383 key
= (char *)ep
->secret_key
[ep
->current_key
];
1385 memset(digest
, 0x00, sizeof(digest
));
1386 sctp_crypto_hmac(sctp_sk(ep
->base
.sk
)->hmac
, key
, &keylen
, &sg
,
1389 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1390 /* Try the previous key. */
1391 key
= (char *)ep
->secret_key
[ep
->last_key
];
1392 memset(digest
, 0x00, sizeof(digest
));
1393 sctp_crypto_hmac(sctp_sk(ep
->base
.sk
)->hmac
, key
, &keylen
,
1396 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1397 /* Yikes! Still bad signature! */
1398 *error
= -SCTP_IERROR_BAD_SIG
;
1404 /* IG Section 2.35.2:
1405 * 3) Compare the port numbers and the verification tag contained
1406 * within the COOKIE ECHO chunk to the actual port numbers and the
1407 * verification tag within the SCTP common header of the received
1408 * packet. If these values do not match the packet MUST be silently
1411 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1412 *error
= -SCTP_IERROR_BAD_TAG
;
1416 if (ntohs(chunk
->sctp_hdr
->source
) != bear_cookie
->peer_addr
.v4
.sin_port
||
1417 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1418 *error
= -SCTP_IERROR_BAD_PORTS
;
1422 /* Check to see if the cookie is stale. If there is already
1423 * an association, there is no need to check cookie's expiration
1424 * for init collision case of lost COOKIE ACK.
1426 if (!asoc
&& tv_lt(bear_cookie
->expiration
, skb
->stamp
)) {
1429 * Section 3.3.10.3 Stale Cookie Error (3)
1433 * Stale Cookie Error: Indicates the receipt of a valid State
1434 * Cookie that has expired.
1436 len
= ntohs(chunk
->chunk_hdr
->length
);
1437 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1439 suseconds_t usecs
= (skb
->stamp
.tv_sec
-
1440 bear_cookie
->expiration
.tv_sec
) * 1000000L +
1441 skb
->stamp
.tv_usec
-
1442 bear_cookie
->expiration
.tv_usec
;
1444 usecs
= htonl(usecs
);
1445 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1446 &usecs
, sizeof(usecs
));
1447 *error
= -SCTP_IERROR_STALE_COOKIE
;
1449 *error
= -SCTP_IERROR_NOMEM
;
1454 /* Make a new base association. */
1455 scope
= sctp_scope(sctp_source(chunk
));
1456 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1458 *error
= -SCTP_IERROR_NOMEM
;
1462 /* Set up our peer's port number. */
1463 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1465 /* Populate the association from the cookie. */
1466 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1468 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1470 *error
= -SCTP_IERROR_NOMEM
;
1474 /* Also, add the destination address. */
1475 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1476 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1480 retval
->next_tsn
= retval
->c
.initial_tsn
;
1481 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1482 retval
->addip_serial
= retval
->c
.initial_tsn
;
1483 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1484 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1485 retval
->peer
.adaption_ind
= retval
->c
.adaption_ind
;
1487 /* The INIT stuff will be done by the side effects. */
1492 sctp_association_free(retval
);
1497 /* Yikes! The packet is either corrupt or deliberately
1500 *error
= -SCTP_IERROR_MALFORMED
;
1504 /********************************************************************
1505 * 3rd Level Abstractions
1506 ********************************************************************/
1508 struct __sctp_missing
{
1511 } __attribute__((packed
));
1514 * Report a missing mandatory parameter.
1516 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1517 sctp_param_t paramtype
,
1518 struct sctp_chunk
*chunk
,
1519 struct sctp_chunk
**errp
)
1521 struct __sctp_missing report
;
1524 len
= WORD_ROUND(sizeof(report
));
1526 /* Make an ERROR chunk, preparing enough room for
1527 * returning multiple unknown parameters.
1530 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1533 report
.num_missing
= htonl(1);
1534 report
.type
= paramtype
;
1535 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
,
1536 &report
, sizeof(report
));
1539 /* Stop processing this chunk. */
1543 /* Report an Invalid Mandatory Parameter. */
1544 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1545 struct sctp_chunk
*chunk
,
1546 struct sctp_chunk
**errp
)
1548 /* Invalid Mandatory Parameter Error has no payload. */
1551 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1554 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, NULL
, 0);
1556 /* Stop processing this chunk. */
1560 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1561 struct sctp_paramhdr
*param
,
1562 const struct sctp_chunk
*chunk
,
1563 struct sctp_chunk
**errp
)
1565 char error
[] = "The following parameter had invalid length:";
1566 size_t payload_len
= WORD_ROUND(sizeof(error
)) +
1567 sizeof(sctp_paramhdr_t
);
1570 /* Create an error chunk and fill it in with our payload. */
1572 *errp
= sctp_make_op_error_space(asoc
, chunk
, payload_len
);
1575 sctp_init_cause(*errp
, SCTP_ERROR_PROTO_VIOLATION
, error
,
1577 sctp_addto_chunk(*errp
, sizeof(sctp_paramhdr_t
), param
);
1584 /* Do not attempt to handle the HOST_NAME parm. However, do
1585 * send back an indicator to the peer.
1587 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1588 union sctp_params param
,
1589 struct sctp_chunk
*chunk
,
1590 struct sctp_chunk
**errp
)
1592 __u16 len
= ntohs(param
.p
->length
);
1594 /* Make an ERROR chunk. */
1596 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1599 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
,
1602 /* Stop processing this chunk. */
1606 /* RFC 3.2.1 & the Implementers Guide 2.2.
1608 * The Parameter Types are encoded such that the
1609 * highest-order two bits specify the action that must be
1610 * taken if the processing endpoint does not recognize the
1613 * 00 - Stop processing this SCTP chunk and discard it,
1614 * do not process any further chunks within it.
1616 * 01 - Stop processing this SCTP chunk and discard it,
1617 * do not process any further chunks within it, and report
1618 * the unrecognized parameter in an 'Unrecognized
1619 * Parameter Type' (in either an ERROR or in the INIT ACK).
1621 * 10 - Skip this parameter and continue processing.
1623 * 11 - Skip this parameter and continue processing but
1624 * report the unrecognized parameter in an
1625 * 'Unrecognized Parameter Type' (in either an ERROR or in
1629 * 0 - discard the chunk
1630 * 1 - continue with the chunk
1632 static int sctp_process_unk_param(const struct sctp_association
*asoc
,
1633 union sctp_params param
,
1634 struct sctp_chunk
*chunk
,
1635 struct sctp_chunk
**errp
)
1639 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
1640 case SCTP_PARAM_ACTION_DISCARD
:
1643 case SCTP_PARAM_ACTION_DISCARD_ERR
:
1645 /* Make an ERROR chunk, preparing enough room for
1646 * returning multiple unknown parameters.
1649 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1650 ntohs(chunk
->chunk_hdr
->length
));
1653 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1655 WORD_ROUND(ntohs(param
.p
->length
)));
1658 case SCTP_PARAM_ACTION_SKIP
:
1660 case SCTP_PARAM_ACTION_SKIP_ERR
:
1661 /* Make an ERROR chunk, preparing enough room for
1662 * returning multiple unknown parameters.
1665 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1666 ntohs(chunk
->chunk_hdr
->length
));
1669 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1671 WORD_ROUND(ntohs(param
.p
->length
)));
1673 /* If there is no memory for generating the ERROR
1674 * report as specified, an ABORT will be triggered
1675 * to the peer and the association won't be
1689 /* Find unrecognized parameters in the chunk.
1691 * 0 - discard the chunk
1692 * 1 - continue with the chunk
1694 static int sctp_verify_param(const struct sctp_association
*asoc
,
1695 union sctp_params param
,
1697 struct sctp_chunk
*chunk
,
1698 struct sctp_chunk
**err_chunk
)
1702 /* FIXME - This routine is not looking at each parameter per the
1703 * chunk type, i.e., unrecognized parameters should be further
1704 * identified based on the chunk id.
1707 switch (param
.p
->type
) {
1708 case SCTP_PARAM_IPV4_ADDRESS
:
1709 case SCTP_PARAM_IPV6_ADDRESS
:
1710 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
1711 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
1712 case SCTP_PARAM_STATE_COOKIE
:
1713 case SCTP_PARAM_HEARTBEAT_INFO
:
1714 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
1715 case SCTP_PARAM_ECN_CAPABLE
:
1716 case SCTP_PARAM_ADAPTION_LAYER_IND
:
1719 case SCTP_PARAM_HOST_NAME_ADDRESS
:
1720 /* Tell the peer, we won't support this param. */
1721 return sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
1722 case SCTP_PARAM_FWD_TSN_SUPPORT
:
1723 if (sctp_prsctp_enable
)
1727 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
1728 ntohs(param
.p
->type
), cid
);
1729 return sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
1736 /* Verify the INIT packet before we process it. */
1737 int sctp_verify_init(const struct sctp_association
*asoc
,
1739 sctp_init_chunk_t
*peer_init
,
1740 struct sctp_chunk
*chunk
,
1741 struct sctp_chunk
**errp
)
1743 union sctp_params param
;
1746 /* Verify stream values are non-zero. */
1747 if ((0 == peer_init
->init_hdr
.num_outbound_streams
) ||
1748 (0 == peer_init
->init_hdr
.num_inbound_streams
)) {
1750 sctp_process_inv_mandatory(asoc
, chunk
, errp
);
1754 /* Check for missing mandatory parameters. */
1755 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1757 if (SCTP_PARAM_STATE_COOKIE
== param
.p
->type
)
1760 } /* for (loop through all parameters) */
1762 /* There is a possibility that a parameter length was bad and
1763 * in that case we would have stoped walking the parameters.
1764 * The current param.p would point at the bad one.
1765 * Current consensus on the mailing list is to generate a PROTOCOL
1766 * VIOLATION error. We build the ERROR chunk here and let the normal
1767 * error handling code build and send the packet.
1769 if (param
.v
< (void*)chunk
->chunk_end
- sizeof(sctp_paramhdr_t
)) {
1770 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
1774 /* The only missing mandatory param possible today is
1775 * the state cookie for an INIT-ACK chunk.
1777 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
) {
1778 sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
1783 /* Find unrecognized parameters. */
1785 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1787 if (!sctp_verify_param(asoc
, param
, cid
, chunk
, errp
)) {
1788 if (SCTP_PARAM_HOST_NAME_ADDRESS
== param
.p
->type
)
1794 } /* for (loop through all parameters) */
1799 /* Unpack the parameters in an INIT packet into an association.
1800 * Returns 0 on failure, else success.
1801 * FIXME: This is an association method.
1803 int sctp_process_init(struct sctp_association
*asoc
, sctp_cid_t cid
,
1804 const union sctp_addr
*peer_addr
,
1805 sctp_init_chunk_t
*peer_init
, int gfp
)
1807 union sctp_params param
;
1808 struct sctp_transport
*transport
;
1809 struct list_head
*pos
, *temp
;
1812 /* We must include the address that the INIT packet came from.
1813 * This is the only address that matters for an INIT packet.
1814 * When processing a COOKIE ECHO, we retrieve the from address
1815 * of the INIT from the cookie.
1818 /* This implementation defaults to making the first transport
1819 * added as the primary transport. The source address seems to
1820 * be a a better choice than any of the embedded addresses.
1823 if(!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
))
1826 /* Process the initialization parameters. */
1828 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1830 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
1834 /* The fixed INIT headers are always in network byte
1837 asoc
->peer
.i
.init_tag
=
1838 ntohl(peer_init
->init_hdr
.init_tag
);
1839 asoc
->peer
.i
.a_rwnd
=
1840 ntohl(peer_init
->init_hdr
.a_rwnd
);
1841 asoc
->peer
.i
.num_outbound_streams
=
1842 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
1843 asoc
->peer
.i
.num_inbound_streams
=
1844 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
1845 asoc
->peer
.i
.initial_tsn
=
1846 ntohl(peer_init
->init_hdr
.initial_tsn
);
1848 /* Apply the upper bounds for output streams based on peer's
1849 * number of inbound streams.
1851 if (asoc
->c
.sinit_num_ostreams
>
1852 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
1853 asoc
->c
.sinit_num_ostreams
=
1854 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
1857 if (asoc
->c
.sinit_max_instreams
>
1858 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
1859 asoc
->c
.sinit_max_instreams
=
1860 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
1863 /* Copy Initiation tag from INIT to VT_peer in cookie. */
1864 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
1866 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
1867 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
1869 /* Copy cookie in case we need to resend COOKIE-ECHO. */
1870 cookie
= asoc
->peer
.cookie
;
1872 asoc
->peer
.cookie
= kmalloc(asoc
->peer
.cookie_len
, gfp
);
1873 if (!asoc
->peer
.cookie
)
1875 memcpy(asoc
->peer
.cookie
, cookie
, asoc
->peer
.cookie_len
);
1878 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
1879 * high (for example, implementations MAY use the size of the receiver
1880 * advertised window).
1882 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
1883 transport
= list_entry(pos
, struct sctp_transport
, transports
);
1884 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
1887 /* Set up the TSN tracking pieces. */
1888 sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_SIZE
,
1889 asoc
->peer
.i
.initial_tsn
);
1891 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
1893 * The stream sequence number in all the streams shall start
1894 * from 0 when the association is established. Also, when the
1895 * stream sequence number reaches the value 65535 the next
1896 * stream sequence number shall be set to 0.
1899 /* Allocate storage for the negotiated streams if it is not a temporary * association.
1905 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
1906 asoc
->c
.sinit_num_ostreams
, gfp
);
1911 if (unlikely(!idr_pre_get(&sctp_assocs_id
, gfp
)))
1913 spin_lock_bh(&sctp_assocs_id_lock
);
1914 error
= idr_get_new_above(&sctp_assocs_id
, (void *)asoc
, 1,
1916 spin_unlock_bh(&sctp_assocs_id_lock
);
1917 if (error
== -EAGAIN
)
1922 asoc
->assoc_id
= (sctp_assoc_t
) assoc_id
;
1925 /* ADDIP Section 4.1 ASCONF Chunk Procedures
1927 * When an endpoint has an ASCONF signaled change to be sent to the
1928 * remote endpoint it should do the following:
1930 * A2) A serial number should be assigned to the Chunk. The serial
1931 * number should be a monotonically increasing number. All serial
1932 * numbers are defined to be initialized at the start of the
1933 * association to the same value as the Initial TSN.
1935 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
1939 /* Release the transport structures. */
1940 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
1941 transport
= list_entry(pos
, struct sctp_transport
, transports
);
1943 sctp_transport_free(transport
);
1950 /* Update asoc with the option described in param.
1952 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
1954 * asoc is the association to update.
1955 * param is the variable length parameter to use for update.
1956 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
1957 * If the current packet is an INIT we want to minimize the amount of
1958 * work we do. In particular, we should not build transport
1959 * structures for the addresses.
1961 static int sctp_process_param(struct sctp_association
*asoc
,
1962 union sctp_params param
,
1963 const union sctp_addr
*peer_addr
,
1966 union sctp_addr addr
;
1974 /* We maintain all INIT parameters in network byte order all the
1975 * time. This allows us to not worry about whether the parameters
1976 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
1978 switch (param
.p
->type
) {
1979 case SCTP_PARAM_IPV6_ADDRESS
:
1980 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
1983 case SCTP_PARAM_IPV4_ADDRESS
:
1984 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
1985 af
->from_addr_param(&addr
, param
.addr
, asoc
->peer
.port
, 0);
1986 scope
= sctp_scope(peer_addr
);
1987 if (sctp_in_scope(&addr
, scope
))
1988 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
))
1992 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
1993 if (!sctp_cookie_preserve_enable
)
1996 stale
= ntohl(param
.life
->lifespan_increment
);
1998 /* Suggested Cookie Life span increment's unit is msec,
2001 asoc
->cookie_life
.tv_sec
+= stale
/ 1000;
2002 asoc
->cookie_life
.tv_usec
+= (stale
% 1000) * 1000;
2005 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2006 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2009 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2010 /* Turn off the default values first so we'll know which
2011 * ones are really set by the peer.
2013 asoc
->peer
.ipv4_address
= 0;
2014 asoc
->peer
.ipv6_address
= 0;
2016 /* Cycle through address types; avoid divide by 0. */
2017 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2019 sat
/= sizeof(__u16
);
2021 for (i
= 0; i
< sat
; ++i
) {
2022 switch (param
.sat
->types
[i
]) {
2023 case SCTP_PARAM_IPV4_ADDRESS
:
2024 asoc
->peer
.ipv4_address
= 1;
2027 case SCTP_PARAM_IPV6_ADDRESS
:
2028 asoc
->peer
.ipv6_address
= 1;
2031 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2032 asoc
->peer
.hostname_address
= 1;
2035 default: /* Just ignore anything else. */
2041 case SCTP_PARAM_STATE_COOKIE
:
2042 asoc
->peer
.cookie_len
=
2043 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2044 asoc
->peer
.cookie
= param
.cookie
->body
;
2047 case SCTP_PARAM_HEARTBEAT_INFO
:
2048 /* Would be odd to receive, but it causes no problems. */
2051 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2052 /* Rejected during verify stage. */
2055 case SCTP_PARAM_ECN_CAPABLE
:
2056 asoc
->peer
.ecn_capable
= 1;
2059 case SCTP_PARAM_ADAPTION_LAYER_IND
:
2060 asoc
->peer
.adaption_ind
= param
.aind
->adaption_ind
;
2063 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2064 if (sctp_prsctp_enable
) {
2065 asoc
->peer
.prsctp_capable
= 1;
2070 /* Any unrecognized parameters should have been caught
2071 * and handled by sctp_verify_param() which should be
2072 * called prior to this routine. Simply log the error
2075 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2076 ntohs(param
.p
->type
), asoc
);
2083 /* Select a new verification tag. */
2084 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2086 /* I believe that this random number generator complies with RFC1750.
2087 * A tag of 0 is reserved for special cases (e.g. INIT).
2092 get_random_bytes(&x
, sizeof(__u32
));
2098 /* Select an initial TSN to send during startup. */
2099 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2103 get_random_bytes(&retval
, sizeof(__u32
));
2108 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2110 * 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
2111 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2112 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2113 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2115 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2116 * | Address Parameter |
2117 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2118 * | ASCONF Parameter #1 |
2119 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2123 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2124 * | ASCONF Parameter #N |
2125 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2127 * Address Parameter and other parameter will not be wrapped in this function
2129 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2130 union sctp_addr
*addr
,
2133 sctp_addiphdr_t asconf
;
2134 struct sctp_chunk
*retval
;
2135 int length
= sizeof(asconf
) + vparam_len
;
2136 union sctp_addr_param addrparam
;
2138 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2140 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2145 /* Create the chunk. */
2146 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF
, 0, length
);
2150 asconf
.serial
= htonl(asoc
->addip_serial
++);
2152 retval
->subh
.addip_hdr
=
2153 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2154 retval
->param_hdr
.v
=
2155 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2161 * 3.2.1 Add IP Address
2163 * 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
2164 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2165 * | Type = 0xC001 | Length = Variable |
2166 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2167 * | ASCONF-Request Correlation ID |
2168 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2169 * | Address Parameter |
2170 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2172 * 3.2.2 Delete IP Address
2174 * 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
2175 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2176 * | Type = 0xC002 | Length = Variable |
2177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2178 * | ASCONF-Request Correlation ID |
2179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2180 * | Address Parameter |
2181 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2184 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2185 union sctp_addr
*laddr
,
2186 struct sockaddr
*addrs
,
2190 sctp_addip_param_t param
;
2191 struct sctp_chunk
*retval
;
2192 union sctp_addr_param addr_param
;
2193 union sctp_addr
*addr
;
2196 int paramlen
= sizeof(param
);
2197 int addr_param_len
= 0;
2201 /* Get total length of all the address parameters. */
2203 for (i
= 0; i
< addrcnt
; i
++) {
2204 addr
= (union sctp_addr
*)addr_buf
;
2205 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2206 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2208 totallen
+= paramlen
;
2209 totallen
+= addr_param_len
;
2211 addr_buf
+= af
->sockaddr_len
;
2214 /* Create an asconf chunk with the required length. */
2215 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2219 /* Add the address parameters to the asconf chunk. */
2221 for (i
= 0; i
< addrcnt
; i
++) {
2222 addr
= (union sctp_addr
*)addr_buf
;
2223 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2224 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2225 param
.param_hdr
.type
= flags
;
2226 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2229 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2230 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2232 addr_buf
+= af
->sockaddr_len
;
2238 * 3.2.4 Set Primary IP Address
2240 * 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
2241 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2242 * | Type =0xC004 | Length = Variable |
2243 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2244 * | ASCONF-Request Correlation ID |
2245 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2246 * | Address Parameter |
2247 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2249 * Create an ASCONF chunk with Set Primary IP address parameter.
2251 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2252 union sctp_addr
*addr
)
2254 sctp_addip_param_t param
;
2255 struct sctp_chunk
*retval
;
2256 int len
= sizeof(param
);
2257 union sctp_addr_param addrparam
;
2259 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2261 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2266 /* Create the chunk and make asconf header. */
2267 retval
= sctp_make_asconf(asoc
, addr
, len
);
2271 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2272 param
.param_hdr
.length
= htons(len
);
2275 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2276 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2281 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2283 * 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
2284 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2285 * | Type = 0x80 | Chunk Flags | Chunk Length |
2286 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2288 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2289 * | ASCONF Parameter Response#1 |
2290 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2294 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2295 * | ASCONF Parameter Response#N |
2296 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2298 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2300 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2301 __u32 serial
, int vparam_len
)
2303 sctp_addiphdr_t asconf
;
2304 struct sctp_chunk
*retval
;
2305 int length
= sizeof(asconf
) + vparam_len
;
2307 /* Create the chunk. */
2308 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
);
2312 asconf
.serial
= htonl(serial
);
2314 retval
->subh
.addip_hdr
=
2315 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2320 /* Add response parameters to an ASCONF_ACK chunk. */
2321 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __u32 crr_id
,
2322 __u16 err_code
, sctp_addip_param_t
*asconf_param
)
2324 sctp_addip_param_t ack_param
;
2325 sctp_errhdr_t err_param
;
2326 int asconf_param_len
= 0;
2327 int err_param_len
= 0;
2328 __u16 response_type
;
2330 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2331 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2333 response_type
= SCTP_PARAM_ERR_CAUSE
;
2334 err_param_len
= sizeof(err_param
);
2337 ntohs(asconf_param
->param_hdr
.length
);
2340 /* Add Success Indication or Error Cause Indication parameter. */
2341 ack_param
.param_hdr
.type
= response_type
;
2342 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2345 ack_param
.crr_id
= crr_id
;
2346 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2348 if (SCTP_ERROR_NO_ERROR
== err_code
)
2351 /* Add Error Cause parameter. */
2352 err_param
.cause
= err_code
;
2353 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2354 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2356 /* Add the failed TLV copied from ASCONF chunk. */
2358 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
2361 /* Process a asconf parameter. */
2362 static __u16
sctp_process_asconf_param(struct sctp_association
*asoc
,
2363 struct sctp_chunk
*asconf
,
2364 sctp_addip_param_t
*asconf_param
)
2366 struct sctp_transport
*peer
;
2368 union sctp_addr addr
;
2369 struct list_head
*pos
;
2370 union sctp_addr_param
*addr_param
;
2372 addr_param
= (union sctp_addr_param
*)
2373 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2375 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2377 return SCTP_ERROR_INV_PARAM
;
2379 af
->from_addr_param(&addr
, addr_param
, asoc
->peer
.port
, 0);
2380 switch (asconf_param
->param_hdr
.type
) {
2381 case SCTP_PARAM_ADD_IP
:
2382 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
2383 * request and does not have the local resources to add this
2384 * new address to the association, it MUST return an Error
2385 * Cause TLV set to the new error code 'Operation Refused
2386 * Due to Resource Shortage'.
2389 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
);
2391 return SCTP_ERROR_RSRC_LOW
;
2393 /* Start the heartbeat timer. */
2394 if (!mod_timer(&peer
->hb_timer
, sctp_transport_timeout(peer
)))
2395 sctp_transport_hold(peer
);
2397 case SCTP_PARAM_DEL_IP
:
2398 /* ADDIP 4.3 D7) If a request is received to delete the
2399 * last remaining IP address of a peer endpoint, the receiver
2400 * MUST send an Error Cause TLV with the error cause set to the
2401 * new error code 'Request to Delete Last Remaining IP Address'.
2403 pos
= asoc
->peer
.transport_addr_list
.next
;
2404 if (pos
->next
== &asoc
->peer
.transport_addr_list
)
2405 return SCTP_ERROR_DEL_LAST_IP
;
2407 /* ADDIP 4.3 D8) If a request is received to delete an IP
2408 * address which is also the source address of the IP packet
2409 * which contained the ASCONF chunk, the receiver MUST reject
2410 * this request. To reject the request the receiver MUST send
2411 * an Error Cause TLV set to the new error code 'Request to
2412 * Delete Source IP Address'
2414 if (sctp_cmp_addr_exact(sctp_source(asconf
), &addr
))
2415 return SCTP_ERROR_DEL_SRC_IP
;
2417 sctp_assoc_del_peer(asoc
, &addr
);
2419 case SCTP_PARAM_SET_PRIMARY
:
2420 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2422 return SCTP_ERROR_INV_PARAM
;
2424 sctp_assoc_set_primary(asoc
, peer
);
2427 return SCTP_ERROR_INV_PARAM
;
2431 return SCTP_ERROR_NO_ERROR
;
2434 /* Process an incoming ASCONF chunk with the next expected serial no. and
2435 * return an ASCONF_ACK chunk to be sent in response.
2437 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
2438 struct sctp_chunk
*asconf
)
2440 sctp_addiphdr_t
*hdr
;
2441 union sctp_addr_param
*addr_param
;
2442 sctp_addip_param_t
*asconf_param
;
2443 struct sctp_chunk
*asconf_ack
;
2447 int chunk_len
= asconf
->skb
->len
;
2449 int all_param_pass
= 1;
2451 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
2452 serial
= ntohl(hdr
->serial
);
2454 /* Skip the addiphdr and store a pointer to address parameter. */
2455 length
= sizeof(sctp_addiphdr_t
);
2456 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
2457 chunk_len
-= length
;
2459 /* Skip the address parameter and store a pointer to the first
2462 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
2463 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
2464 chunk_len
-= length
;
2466 /* create an ASCONF_ACK chunk.
2467 * Based on the definitions of parameters, we know that the size of
2468 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
2471 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 2);
2475 /* Process the TLVs contained within the ASCONF chunk. */
2476 while (chunk_len
> 0) {
2477 err_code
= sctp_process_asconf_param(asoc
, asconf
,
2480 * If an error response is received for a TLV parameter,
2481 * all TLVs with no response before the failed TLV are
2482 * considered successful if not reported. All TLVs after
2483 * the failed response are considered unsuccessful unless
2484 * a specific success indication is present for the parameter.
2486 if (SCTP_ERROR_NO_ERROR
!= err_code
)
2489 if (!all_param_pass
)
2490 sctp_add_asconf_response(asconf_ack
,
2491 asconf_param
->crr_id
, err_code
,
2494 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
2495 * an IP address sends an 'Out of Resource' in its response, it
2496 * MUST also fail any subsequent add or delete requests bundled
2499 if (SCTP_ERROR_RSRC_LOW
== err_code
)
2502 /* Move to the next ASCONF param. */
2503 length
= ntohs(asconf_param
->param_hdr
.length
);
2504 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
2506 chunk_len
-= length
;
2510 asoc
->peer
.addip_serial
++;
2512 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
2513 * after freeing the reference to old asconf ack if any.
2516 if (asoc
->addip_last_asconf_ack
)
2517 sctp_chunk_free(asoc
->addip_last_asconf_ack
);
2519 sctp_chunk_hold(asconf_ack
);
2520 asoc
->addip_last_asconf_ack
= asconf_ack
;
2526 /* Process a asconf parameter that is successfully acked. */
2527 static int sctp_asconf_param_success(struct sctp_association
*asoc
,
2528 sctp_addip_param_t
*asconf_param
)
2531 union sctp_addr addr
;
2532 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
2533 union sctp_addr_param
*addr_param
;
2534 struct list_head
*pos
;
2535 struct sctp_transport
*transport
;
2538 addr_param
= (union sctp_addr_param
*)
2539 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2541 /* We have checked the packet before, so we do not check again. */
2542 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2543 af
->from_addr_param(&addr
, addr_param
, bp
->port
, 0);
2545 switch (asconf_param
->param_hdr
.type
) {
2546 case SCTP_PARAM_ADD_IP
:
2547 sctp_local_bh_disable();
2548 sctp_write_lock(&asoc
->base
.addr_lock
);
2549 retval
= sctp_add_bind_addr(bp
, &addr
, GFP_ATOMIC
);
2550 sctp_write_unlock(&asoc
->base
.addr_lock
);
2551 sctp_local_bh_enable();
2553 case SCTP_PARAM_DEL_IP
:
2554 sctp_local_bh_disable();
2555 sctp_write_lock(&asoc
->base
.addr_lock
);
2556 retval
= sctp_del_bind_addr(bp
, &addr
);
2557 sctp_write_unlock(&asoc
->base
.addr_lock
);
2558 sctp_local_bh_enable();
2559 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2560 transport
= list_entry(pos
, struct sctp_transport
,
2562 sctp_transport_route(transport
, NULL
,
2563 sctp_sk(asoc
->base
.sk
));
2573 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
2574 * for the given asconf parameter. If there is no response for this parameter,
2575 * return the error code based on the third argument 'no_err'.
2577 * A7) If an error response is received for a TLV parameter, all TLVs with no
2578 * response before the failed TLV are considered successful if not reported.
2579 * All TLVs after the failed response are considered unsuccessful unless a
2580 * specific success indication is present for the parameter.
2582 static __u16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
2583 sctp_addip_param_t
*asconf_param
,
2586 sctp_addip_param_t
*asconf_ack_param
;
2587 sctp_errhdr_t
*err_param
;
2589 int asconf_ack_len
= asconf_ack
->skb
->len
;
2593 err_code
= SCTP_ERROR_NO_ERROR
;
2595 err_code
= SCTP_ERROR_REQ_REFUSED
;
2597 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
2598 * the first asconf_ack parameter.
2600 length
= sizeof(sctp_addiphdr_t
);
2601 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
2603 asconf_ack_len
-= length
;
2605 while (asconf_ack_len
> 0) {
2606 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
2607 switch(asconf_ack_param
->param_hdr
.type
) {
2608 case SCTP_PARAM_SUCCESS_REPORT
:
2609 return SCTP_ERROR_NO_ERROR
;
2610 case SCTP_PARAM_ERR_CAUSE
:
2611 length
= sizeof(sctp_addip_param_t
);
2612 err_param
= (sctp_errhdr_t
*)
2613 ((void *)asconf_ack_param
+ length
);
2614 asconf_ack_len
-= length
;
2615 if (asconf_ack_len
> 0)
2616 return err_param
->cause
;
2618 return SCTP_ERROR_INV_PARAM
;
2621 return SCTP_ERROR_INV_PARAM
;
2625 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
2626 asconf_ack_param
= (sctp_addip_param_t
*)
2627 ((void *)asconf_ack_param
+ length
);
2628 asconf_ack_len
-= length
;
2634 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
2635 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
2636 struct sctp_chunk
*asconf_ack
)
2638 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
2639 union sctp_addr_param
*addr_param
;
2640 sctp_addip_param_t
*asconf_param
;
2642 int asconf_len
= asconf
->skb
->len
;
2643 int all_param_pass
= 0;
2646 __u16 err_code
= SCTP_ERROR_NO_ERROR
;
2648 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
2649 * a pointer to address parameter.
2651 length
= sizeof(sctp_addip_chunk_t
);
2652 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
2653 asconf_len
-= length
;
2655 /* Skip the address parameter in the last asconf sent and store a
2656 * pointer to the first asconf paramter.
2658 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
2659 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
2660 asconf_len
-= length
;
2663 * A8) If there is no response(s) to specific TLV parameter(s), and no
2664 * failures are indicated, then all request(s) are considered
2667 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
2670 /* Process the TLVs contained in the last sent ASCONF chunk. */
2671 while (asconf_len
> 0) {
2673 err_code
= SCTP_ERROR_NO_ERROR
;
2675 err_code
= sctp_get_asconf_response(asconf_ack
,
2678 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
2683 case SCTP_ERROR_NO_ERROR
:
2684 retval
= sctp_asconf_param_success(asoc
, asconf_param
);
2687 case SCTP_ERROR_RSRC_LOW
:
2691 case SCTP_ERROR_INV_PARAM
:
2692 /* Disable sending this type of asconf parameter in
2695 asoc
->peer
.addip_disabled_mask
|=
2696 asconf_param
->param_hdr
.type
;
2699 case SCTP_ERROR_REQ_REFUSED
:
2700 case SCTP_ERROR_DEL_LAST_IP
:
2701 case SCTP_ERROR_DEL_SRC_IP
:
2706 /* Skip the processed asconf parameter and move to the next
2709 length
= ntohs(asconf_param
->param_hdr
.length
);
2710 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
2712 asconf_len
-= length
;
2715 /* Free the cached last sent asconf chunk. */
2716 sctp_chunk_free(asconf
);
2717 asoc
->addip_last_asconf
= NULL
;
2719 /* Send the next asconf chunk from the addip chunk queue. */
2720 asconf
= (struct sctp_chunk
*)__skb_dequeue(&asoc
->addip_chunks
);
2722 /* Hold the chunk until an ASCONF_ACK is received. */
2723 sctp_chunk_hold(asconf
);
2724 if (sctp_primitive_ASCONF(asoc
, asconf
))
2725 sctp_chunk_free(asconf
);
2727 asoc
->addip_last_asconf
= asconf
;
2733 /* Make a FWD TSN chunk. */
2734 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
2735 __u32 new_cum_tsn
, size_t nstreams
,
2736 struct sctp_fwdtsn_skip
*skiplist
)
2738 struct sctp_chunk
*retval
= NULL
;
2739 struct sctp_fwdtsn_chunk
*ftsn_chunk
;
2740 struct sctp_fwdtsn_hdr ftsn_hdr
;
2741 struct sctp_fwdtsn_skip skip
;
2745 hint
= (nstreams
+ 1) * sizeof(__u32
);
2747 /* Maybe set the T-bit if we have no association. */
2748 retval
= sctp_make_chunk(asoc
, SCTP_CID_FWD_TSN
, 0, hint
);
2753 ftsn_chunk
= (struct sctp_fwdtsn_chunk
*)retval
->subh
.fwdtsn_hdr
;
2755 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
2756 retval
->subh
.fwdtsn_hdr
=
2757 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
2759 for (i
= 0; i
< nstreams
; i
++) {
2760 skip
.stream
= skiplist
[i
].stream
;
2761 skip
.ssn
= skiplist
[i
].ssn
;
2762 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);