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
,
113 const void *payload
, size_t paylen
)
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
);
123 sctp_addto_chunk(chunk
, paylen
, payload
);
126 /* 3.3.2 Initiation (INIT) (1)
128 * This chunk is used to initiate a SCTP association between two
129 * endpoints. The format of the INIT chunk is shown below:
132 * 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
133 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
134 * | Type = 1 | Chunk Flags | Chunk Length |
135 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
137 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
138 * | Advertised Receiver Window Credit (a_rwnd) |
139 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
140 * | Number of Outbound Streams | Number of Inbound Streams |
141 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
143 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
145 * / Optional/Variable-Length Parameters /
147 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
150 * The INIT chunk contains the following parameters. Unless otherwise
151 * noted, each parameter MUST only be included once in the INIT chunk.
153 * Fixed Parameters Status
154 * ----------------------------------------------
155 * Initiate Tag Mandatory
156 * Advertised Receiver Window Credit Mandatory
157 * Number of Outbound Streams Mandatory
158 * Number of Inbound Streams Mandatory
159 * Initial TSN Mandatory
161 * Variable Parameters Status Type Value
162 * -------------------------------------------------------------
163 * IPv4 Address (Note 1) Optional 5
164 * IPv6 Address (Note 1) Optional 6
165 * Cookie Preservative Optional 9
166 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
167 * Host Name Address (Note 3) Optional 11
168 * Supported Address Types (Note 4) Optional 12
170 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
171 const struct sctp_bind_addr
*bp
,
172 gfp_t gfp
, int vparam_len
)
175 union sctp_params addrs
;
177 struct sctp_chunk
*retval
= NULL
;
178 int num_types
, addrs_len
= 0;
179 struct sctp_sock
*sp
;
180 sctp_supported_addrs_param_t sat
;
182 sctp_adaptation_ind_param_t aiparam
;
184 /* RFC 2960 3.3.2 Initiation (INIT) (1)
186 * Note 1: The INIT chunks can contain multiple addresses that
187 * can be IPv4 and/or IPv6 in any combination.
191 /* Convert the provided bind address list to raw format. */
192 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
194 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
195 init
.a_rwnd
= htonl(asoc
->rwnd
);
196 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
197 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
198 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
200 /* How many address types are needed? */
201 sp
= sctp_sk(asoc
->base
.sk
);
202 num_types
= sp
->pf
->supported_addrs(sp
, types
);
204 chunksize
= sizeof(init
) + addrs_len
+ SCTP_SAT_LEN(num_types
);
205 chunksize
+= sizeof(ecap_param
);
206 if (sctp_prsctp_enable
)
207 chunksize
+= sizeof(prsctp_param
);
208 chunksize
+= sizeof(aiparam
);
209 chunksize
+= vparam_len
;
211 /* RFC 2960 3.3.2 Initiation (INIT) (1)
213 * Note 3: An INIT chunk MUST NOT contain more than one Host
214 * Name address parameter. Moreover, the sender of the INIT
215 * MUST NOT combine any other address types with the Host Name
216 * address in the INIT. The receiver of INIT MUST ignore any
217 * other address types if the Host Name address parameter is
218 * present in the received INIT chunk.
220 * PLEASE DO NOT FIXME [This version does not support Host Name.]
223 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT
, 0, chunksize
);
227 retval
->subh
.init_hdr
=
228 sctp_addto_chunk(retval
, sizeof(init
), &init
);
229 retval
->param_hdr
.v
=
230 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
232 /* RFC 2960 3.3.2 Initiation (INIT) (1)
234 * Note 4: This parameter, when present, specifies all the
235 * address types the sending endpoint can support. The absence
236 * of this parameter indicates that the sending endpoint can
237 * support any address type.
239 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
240 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
241 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
242 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
244 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
245 if (sctp_prsctp_enable
)
246 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
247 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
248 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
249 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
250 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
256 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
257 const struct sctp_chunk
*chunk
,
258 gfp_t gfp
, int unkparam_len
)
260 sctp_inithdr_t initack
;
261 struct sctp_chunk
*retval
;
262 union sctp_params addrs
;
264 sctp_cookie_param_t
*cookie
;
267 sctp_adaptation_ind_param_t aiparam
;
271 /* Note: there may be no addresses to embed. */
272 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
274 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
275 initack
.a_rwnd
= htonl(asoc
->rwnd
);
276 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
277 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
278 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
280 /* FIXME: We really ought to build the cookie right
281 * into the packet instead of allocating more fresh memory.
283 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
288 /* Calculate the total size of allocation, include the reserved
289 * space for reporting unknown parameters if it is specified.
291 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
293 /* Tell peer that we'll do ECN only if peer advertised such cap. */
294 if (asoc
->peer
.ecn_capable
)
295 chunksize
+= sizeof(ecap_param
);
297 /* Tell peer that we'll do PR-SCTP only if peer advertised. */
298 if (asoc
->peer
.prsctp_capable
)
299 chunksize
+= sizeof(prsctp_param
);
301 chunksize
+= sizeof(aiparam
);
303 /* Now allocate and fill out the chunk. */
304 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
);
308 /* Per the advice in RFC 2960 6.4, send this reply to
309 * the source of the INIT packet.
311 retval
->transport
= chunk
->transport
;
312 retval
->subh
.init_hdr
=
313 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
314 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
315 sctp_addto_chunk(retval
, cookie_len
, cookie
);
316 if (asoc
->peer
.ecn_capable
)
317 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
318 if (asoc
->peer
.prsctp_capable
)
319 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
321 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
322 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
323 aiparam
.adaptation_ind
= htonl(sctp_sk(asoc
->base
.sk
)->adaptation_ind
);
324 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
326 /* We need to remove the const qualifier at this point. */
327 retval
->asoc
= (struct sctp_association
*) asoc
;
329 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
331 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
332 * HEARTBEAT ACK, * etc.) to the same destination transport
333 * address from which it received the DATA or control chunk
334 * to which it is replying.
336 * [INIT ACK back to where the INIT came from.]
339 retval
->transport
= chunk
->transport
;
348 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
350 * This chunk is used only during the initialization of an association.
351 * It is sent by the initiator of an association to its peer to complete
352 * the initialization process. This chunk MUST precede any DATA chunk
353 * sent within the association, but MAY be bundled with one or more DATA
354 * chunks in the same packet.
357 * 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
358 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
359 * | Type = 10 |Chunk Flags | Length |
360 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
363 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
367 * Set to zero on transmit and ignored on receipt.
369 * Length: 16 bits (unsigned integer)
371 * Set to the size of the chunk in bytes, including the 4 bytes of
372 * the chunk header and the size of the Cookie.
374 * Cookie: variable size
376 * This field must contain the exact cookie received in the
377 * State Cookie parameter from the previous INIT ACK.
379 * An implementation SHOULD make the cookie as small as possible
380 * to insure interoperability.
382 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
383 const struct sctp_chunk
*chunk
)
385 struct sctp_chunk
*retval
;
389 cookie
= asoc
->peer
.cookie
;
390 cookie_len
= asoc
->peer
.cookie_len
;
392 /* Build a cookie echo chunk. */
393 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ECHO
, 0, cookie_len
);
396 retval
->subh
.cookie_hdr
=
397 sctp_addto_chunk(retval
, cookie_len
, cookie
);
399 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
401 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
402 * HEARTBEAT ACK, * etc.) to the same destination transport
403 * address from which it * received the DATA or control chunk
404 * to which it is replying.
406 * [COOKIE ECHO back to where the INIT ACK came from.]
409 retval
->transport
= chunk
->transport
;
415 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
417 * This chunk is used only during the initialization of an
418 * association. It is used to acknowledge the receipt of a COOKIE
419 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
420 * within the association, but MAY be bundled with one or more DATA
421 * chunks or SACK chunk in the same SCTP packet.
424 * 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
425 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
426 * | Type = 11 |Chunk Flags | Length = 4 |
427 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
429 * Chunk Flags: 8 bits
431 * Set to zero on transmit and ignored on receipt.
433 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
434 const struct sctp_chunk
*chunk
)
436 struct sctp_chunk
*retval
;
438 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0);
440 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
442 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
443 * HEARTBEAT ACK, * etc.) to the same destination transport
444 * address from which it * received the DATA or control chunk
445 * to which it is replying.
447 * [COOKIE ACK back to where the COOKIE ECHO came from.]
450 retval
->transport
= chunk
->transport
;
456 * Appendix A: Explicit Congestion Notification:
459 * RFC 2481 details a specific bit for a sender to send in the header of
460 * its next outbound TCP segment to indicate to its peer that it has
461 * reduced its congestion window. This is termed the CWR bit. For
462 * SCTP the same indication is made by including the CWR chunk.
463 * This chunk contains one data element, i.e. the TSN number that
464 * was sent in the ECNE chunk. This element represents the lowest
465 * TSN number in the datagram that was originally marked with the
469 * 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
470 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
471 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
472 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
473 * | Lowest TSN Number |
474 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
476 * Note: The CWR is considered a Control chunk.
478 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
479 const __u32 lowest_tsn
,
480 const struct sctp_chunk
*chunk
)
482 struct sctp_chunk
*retval
;
485 cwr
.lowest_tsn
= htonl(lowest_tsn
);
486 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_CWR
, 0,
487 sizeof(sctp_cwrhdr_t
));
492 retval
->subh
.ecn_cwr_hdr
=
493 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
495 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
497 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
498 * HEARTBEAT ACK, * etc.) to the same destination transport
499 * address from which it * received the DATA or control chunk
500 * to which it is replying.
502 * [Report a reduced congestion window back to where the ECNE
506 retval
->transport
= chunk
->transport
;
512 /* Make an ECNE chunk. This is a congestion experienced report. */
513 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
514 const __u32 lowest_tsn
)
516 struct sctp_chunk
*retval
;
519 ecne
.lowest_tsn
= htonl(lowest_tsn
);
520 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_ECNE
, 0,
521 sizeof(sctp_ecnehdr_t
));
524 retval
->subh
.ecne_hdr
=
525 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
531 /* Make a DATA chunk for the given association from the provided
532 * parameters. However, do not populate the data payload.
534 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
535 const struct sctp_sndrcvinfo
*sinfo
,
536 int data_len
, __u8 flags
, __u16 ssn
)
538 struct sctp_chunk
*retval
;
539 struct sctp_datahdr dp
;
542 /* We assign the TSN as LATE as possible, not here when
543 * creating the chunk.
546 dp
.stream
= htons(sinfo
->sinfo_stream
);
547 dp
.ppid
= sinfo
->sinfo_ppid
;
549 /* Set the flags for an unordered send. */
550 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
551 flags
|= SCTP_DATA_UNORDERED
;
556 chunk_len
= sizeof(dp
) + data_len
;
557 retval
= sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, chunk_len
);
561 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
562 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
568 /* Create a selective ackowledgement (SACK) for the given
569 * association. This reports on which TSN's we've seen to date,
570 * including duplicates and gaps.
572 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
574 struct sctp_chunk
*retval
;
575 struct sctp_sackhdr sack
;
578 __u16 num_gabs
, num_dup_tsns
;
579 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
581 ctsn
= sctp_tsnmap_get_ctsn(map
);
582 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn
);
584 /* How much room is needed in the chunk? */
585 num_gabs
= sctp_tsnmap_num_gabs(map
);
586 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
588 /* Initialize the SACK header. */
589 sack
.cum_tsn_ack
= htonl(ctsn
);
590 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
591 sack
.num_gap_ack_blocks
= htons(num_gabs
);
592 sack
.num_dup_tsns
= htons(num_dup_tsns
);
595 + sizeof(struct sctp_gap_ack_block
) * num_gabs
596 + sizeof(__u32
) * num_dup_tsns
;
598 /* Create the chunk. */
599 retval
= sctp_make_chunk(asoc
, SCTP_CID_SACK
, 0, len
);
603 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
605 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
606 * HEARTBEAT ACK, etc.) to the same destination transport
607 * address from which it received the DATA or control chunk to
608 * which it is replying. This rule should also be followed if
609 * the endpoint is bundling DATA chunks together with the
612 * However, when acknowledging multiple DATA chunks received
613 * in packets from different source addresses in a single
614 * SACK, the SACK chunk may be transmitted to one of the
615 * destination transport addresses from which the DATA or
616 * control chunks being acknowledged were received.
618 * [BUG: We do not implement the following paragraph.
619 * Perhaps we should remember the last transport we used for a
620 * SACK and avoid that (if possible) if we have seen any
621 * duplicates. --piggy]
623 * When a receiver of a duplicate DATA chunk sends a SACK to a
624 * multi- homed endpoint it MAY be beneficial to vary the
625 * destination address and not use the source address of the
626 * DATA chunk. The reason being that receiving a duplicate
627 * from a multi-homed endpoint might indicate that the return
628 * path (as specified in the source address of the DATA chunk)
629 * for the SACK is broken.
631 * [Send to the address from which we last received a DATA chunk.]
633 retval
->transport
= asoc
->peer
.last_data_from
;
635 retval
->subh
.sack_hdr
=
636 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
638 /* Add the gap ack block information. */
640 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
641 sctp_tsnmap_get_gabs(map
));
643 /* Add the duplicate TSN information. */
645 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
646 sctp_tsnmap_get_dups(map
));
652 /* Make a SHUTDOWN chunk. */
653 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
654 const struct sctp_chunk
*chunk
)
656 struct sctp_chunk
*retval
;
657 sctp_shutdownhdr_t shut
;
660 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
661 shut
.cum_tsn_ack
= htonl(ctsn
);
663 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN
, 0,
664 sizeof(sctp_shutdownhdr_t
));
668 retval
->subh
.shutdown_hdr
=
669 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
672 retval
->transport
= chunk
->transport
;
677 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
678 const struct sctp_chunk
*chunk
)
680 struct sctp_chunk
*retval
;
682 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0);
684 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
686 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
687 * HEARTBEAT ACK, * etc.) to the same destination transport
688 * address from which it * received the DATA or control chunk
689 * to which it is replying.
691 * [ACK back to where the SHUTDOWN came from.]
694 retval
->transport
= chunk
->transport
;
699 struct sctp_chunk
*sctp_make_shutdown_complete(
700 const struct sctp_association
*asoc
,
701 const struct sctp_chunk
*chunk
)
703 struct sctp_chunk
*retval
;
706 /* Set the T-bit if we have no association (vtag will be
709 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
711 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
, 0);
713 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
715 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
716 * HEARTBEAT ACK, * etc.) to the same destination transport
717 * address from which it * received the DATA or control chunk
718 * to which it is replying.
720 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
724 retval
->transport
= chunk
->transport
;
729 /* Create an ABORT. Note that we set the T bit if we have no
730 * association, except when responding to an INIT (sctpimpguide 2.41).
732 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
733 const struct sctp_chunk
*chunk
,
736 struct sctp_chunk
*retval
;
739 /* Set the T-bit if we have no association and 'chunk' is not
740 * an INIT (vtag will be reflected).
743 if (chunk
&& chunk
->chunk_hdr
&&
744 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
747 flags
= SCTP_CHUNK_FLAG_T
;
750 retval
= sctp_make_chunk(asoc
, SCTP_CID_ABORT
, flags
, hint
);
752 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
754 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
755 * HEARTBEAT ACK, * etc.) to the same destination transport
756 * address from which it * received the DATA or control chunk
757 * to which it is replying.
759 * [ABORT back to where the offender came from.]
762 retval
->transport
= chunk
->transport
;
767 /* Helper to create ABORT with a NO_USER_DATA error. */
768 struct sctp_chunk
*sctp_make_abort_no_data(
769 const struct sctp_association
*asoc
,
770 const struct sctp_chunk
*chunk
, __u32 tsn
)
772 struct sctp_chunk
*retval
;
775 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
781 /* Put the tsn back into network byte order. */
782 payload
= htonl(tsn
);
783 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, (const void *)&payload
,
786 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
788 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
789 * HEARTBEAT ACK, * etc.) to the same destination transport
790 * address from which it * received the DATA or control chunk
791 * to which it is replying.
793 * [ABORT back to where the offender came from.]
796 retval
->transport
= chunk
->transport
;
802 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
803 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
804 const struct msghdr
*msg
,
807 struct sctp_chunk
*retval
;
808 void *payload
= NULL
;
811 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
816 /* Put the msg_iov together into payload. */
817 payload
= kmalloc(paylen
, GFP_KERNEL
);
821 err
= memcpy_fromiovec(payload
, msg
->msg_iov
, paylen
);
826 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, payload
, paylen
);
836 sctp_chunk_free(retval
);
842 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
843 struct sctp_chunk
*sctp_make_abort_violation(
844 const struct sctp_association
*asoc
,
845 const struct sctp_chunk
*chunk
,
849 struct sctp_chunk
*retval
;
850 struct sctp_paramhdr phdr
;
852 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
853 + sizeof(sctp_chunkhdr_t
));
857 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, payload
, paylen
);
859 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
860 phdr
.length
= chunk
->chunk_hdr
->length
;
861 sctp_addto_chunk(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
867 /* Make a HEARTBEAT chunk. */
868 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
869 const struct sctp_transport
*transport
,
870 const void *payload
, const size_t paylen
)
872 struct sctp_chunk
*retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT
,
878 /* Cast away the 'const', as this is just telling the chunk
879 * what transport it belongs to.
881 retval
->transport
= (struct sctp_transport
*) transport
;
882 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
888 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
889 const struct sctp_chunk
*chunk
,
890 const void *payload
, const size_t paylen
)
892 struct sctp_chunk
*retval
;
894 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
);
898 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
900 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
902 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
903 * HEARTBEAT ACK, * etc.) to the same destination transport
904 * address from which it * received the DATA or control chunk
905 * to which it is replying.
907 * [HBACK back to where the HEARTBEAT came from.]
910 retval
->transport
= chunk
->transport
;
916 /* Create an Operation Error chunk with the specified space reserved.
917 * This routine can be used for containing multiple causes in the chunk.
919 static struct sctp_chunk
*sctp_make_op_error_space(
920 const struct sctp_association
*asoc
,
921 const struct sctp_chunk
*chunk
,
924 struct sctp_chunk
*retval
;
926 retval
= sctp_make_chunk(asoc
, SCTP_CID_ERROR
, 0,
927 sizeof(sctp_errhdr_t
) + size
);
931 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
933 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
934 * HEARTBEAT ACK, etc.) to the same destination transport
935 * address from which it received the DATA or control chunk
936 * to which it is replying.
940 retval
->transport
= chunk
->transport
;
946 /* Create an Operation Error chunk. */
947 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
948 const struct sctp_chunk
*chunk
,
949 __be16 cause_code
, const void *payload
,
952 struct sctp_chunk
*retval
;
954 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
);
958 sctp_init_cause(retval
, cause_code
, payload
, paylen
);
964 /********************************************************************
965 * 2nd Level Abstractions
966 ********************************************************************/
968 /* Turn an skb into a chunk.
969 * FIXME: Eventually move the structure directly inside the skb->cb[].
971 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
972 const struct sctp_association
*asoc
,
975 struct sctp_chunk
*retval
;
977 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, GFP_ATOMIC
);
983 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb
);
986 INIT_LIST_HEAD(&retval
->list
);
988 retval
->asoc
= (struct sctp_association
*)asoc
;
992 retval
->rtt_in_progress
= 0;
994 retval
->singleton
= 1;
995 retval
->end_of_packet
= 0;
996 retval
->ecn_ce_done
= 0;
997 retval
->pdiscard
= 0;
999 /* sctpimpguide-05.txt Section 2.8.2
1000 * M1) Each time a new DATA chunk is transmitted
1001 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1002 * 'TSN.Missing.Report' count will be used to determine missing chunks
1003 * and when to fast retransmit.
1005 retval
->tsn_missing_report
= 0;
1006 retval
->tsn_gap_acked
= 0;
1007 retval
->fast_retransmit
= 0;
1009 /* If this is a fragmented message, track all fragments
1010 * of the message (for SEND_FAILED).
1014 /* Polish the bead hole. */
1015 INIT_LIST_HEAD(&retval
->transmitted_list
);
1016 INIT_LIST_HEAD(&retval
->frag_list
);
1017 SCTP_DBG_OBJCNT_INC(chunk
);
1018 atomic_set(&retval
->refcnt
, 1);
1024 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1025 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1026 union sctp_addr
*dest
)
1028 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1029 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1032 /* Extract the source address from a chunk. */
1033 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1035 /* If we have a known transport, use that. */
1036 if (chunk
->transport
) {
1037 return &chunk
->transport
->ipaddr
;
1039 /* Otherwise, extract it from the IP header. */
1040 return &chunk
->source
;
1044 /* Create a new chunk, setting the type and flags headers from the
1045 * arguments, reserving enough space for a 'paylen' byte payload.
1048 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
1049 __u8 type
, __u8 flags
, int paylen
)
1051 struct sctp_chunk
*retval
;
1052 sctp_chunkhdr_t
*chunk_hdr
;
1053 struct sk_buff
*skb
;
1056 /* No need to allocate LL here, as this is only a chunk. */
1057 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
),
1062 /* Make room for the chunk header. */
1063 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1064 chunk_hdr
->type
= type
;
1065 chunk_hdr
->flags
= flags
;
1066 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1068 sk
= asoc
? asoc
->base
.sk
: NULL
;
1069 retval
= sctp_chunkify(skb
, asoc
, sk
);
1075 retval
->chunk_hdr
= chunk_hdr
;
1076 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1078 /* Set the skb to the belonging sock for accounting. */
1087 /* Release the memory occupied by a chunk. */
1088 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1090 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1091 dev_kfree_skb(chunk
->skb
);
1093 SCTP_DBG_OBJCNT_DEC(chunk
);
1094 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1097 /* Possibly, free the chunk. */
1098 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1100 BUG_ON(!list_empty(&chunk
->list
));
1101 list_del_init(&chunk
->transmitted_list
);
1103 /* Release our reference on the message tracker. */
1105 sctp_datamsg_put(chunk
->msg
);
1107 sctp_chunk_put(chunk
);
1110 /* Grab a reference to the chunk. */
1111 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1113 atomic_inc(&ch
->refcnt
);
1116 /* Release a reference to the chunk. */
1117 void sctp_chunk_put(struct sctp_chunk
*ch
)
1119 if (atomic_dec_and_test(&ch
->refcnt
))
1120 sctp_chunk_destroy(ch
);
1123 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1126 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1130 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1131 int padlen
= chunklen
% 4;
1133 padding
= skb_put(chunk
->skb
, padlen
);
1134 target
= skb_put(chunk
->skb
, len
);
1136 memset(padding
, 0, padlen
);
1137 memcpy(target
, data
, len
);
1139 /* Adjust the chunk length field. */
1140 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1141 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1146 /* Append bytes from user space to the end of a chunk. Will panic if
1147 * chunk is not big enough.
1148 * Returns a kernel err value.
1150 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int off
, int len
,
1156 /* Make room in chunk for data. */
1157 target
= skb_put(chunk
->skb
, len
);
1159 /* Copy data (whole iovec) into chunk */
1160 if ((err
= memcpy_fromiovecend(target
, data
, off
, len
)))
1163 /* Adjust the chunk length field. */
1164 chunk
->chunk_hdr
->length
=
1165 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1166 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1172 /* Helper function to assign a TSN if needed. This assumes that both
1173 * the data_hdr and association have already been assigned.
1175 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1183 /* This is the last possible instant to assign a SSN. */
1184 if (chunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1187 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1188 if (chunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1189 ssn
= sctp_ssn_next(&chunk
->asoc
->ssnmap
->out
, sid
);
1191 ssn
= sctp_ssn_peek(&chunk
->asoc
->ssnmap
->out
, sid
);
1194 chunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1198 /* Helper function to assign a TSN if needed. This assumes that both
1199 * the data_hdr and association have already been assigned.
1201 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1203 if (!chunk
->has_tsn
) {
1204 /* This is the last possible instant to
1207 chunk
->subh
.data_hdr
->tsn
=
1208 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1213 /* Create a CLOSED association to use with an incoming packet. */
1214 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1215 struct sctp_chunk
*chunk
,
1218 struct sctp_association
*asoc
;
1219 struct sk_buff
*skb
;
1223 /* Create the bare association. */
1224 scope
= sctp_scope(sctp_source(chunk
));
1225 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1230 /* Create an entry for the source address of the packet. */
1231 af
= sctp_get_af_specific(ipver2af(ip_hdr(skb
)->version
));
1234 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1239 sctp_association_free(asoc
);
1243 /* Build a cookie representing asoc.
1244 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1246 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1247 const struct sctp_association
*asoc
,
1248 const struct sctp_chunk
*init_chunk
,
1250 const __u8
*raw_addrs
, int addrs_len
)
1252 sctp_cookie_param_t
*retval
;
1253 struct sctp_signed_cookie
*cookie
;
1254 struct scatterlist sg
;
1255 int headersize
, bodysize
;
1256 unsigned int keylen
;
1259 /* Header size is static data prior to the actual cookie, including
1262 headersize
= sizeof(sctp_paramhdr_t
) +
1263 (sizeof(struct sctp_signed_cookie
) -
1264 sizeof(struct sctp_cookie
));
1265 bodysize
= sizeof(struct sctp_cookie
)
1266 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1268 /* Pad out the cookie to a multiple to make the signature
1269 * functions simpler to write.
1271 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1272 bodysize
+= SCTP_COOKIE_MULTIPLE
1273 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1274 *cookie_len
= headersize
+ bodysize
;
1276 /* Clear this memory since we are sending this data structure
1277 * out on the network.
1279 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1283 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1285 /* Set up the parameter header. */
1286 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1287 retval
->p
.length
= htons(*cookie_len
);
1289 /* Copy the cookie part of the association itself. */
1290 cookie
->c
= asoc
->c
;
1291 /* Save the raw address list length in the cookie. */
1292 cookie
->c
.raw_addr_list_len
= addrs_len
;
1294 /* Remember PR-SCTP capability. */
1295 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1297 /* Save adaptation indication in the cookie. */
1298 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1300 /* Set an expiration time for the cookie. */
1301 do_gettimeofday(&cookie
->c
.expiration
);
1302 TIMEVAL_ADD(asoc
->cookie_life
, cookie
->c
.expiration
);
1304 /* Copy the peer's init packet. */
1305 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1306 ntohs(init_chunk
->chunk_hdr
->length
));
1308 /* Copy the raw local address list of the association. */
1309 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1310 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1312 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1313 struct hash_desc desc
;
1315 /* Sign the message. */
1316 sg
.page
= virt_to_page(&cookie
->c
);
1317 sg
.offset
= (unsigned long)(&cookie
->c
) % PAGE_SIZE
;
1318 sg
.length
= bodysize
;
1319 keylen
= SCTP_SECRET_SIZE
;
1320 key
= (char *)ep
->secret_key
[ep
->current_key
];
1321 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1324 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1325 crypto_hash_digest(&desc
, &sg
, bodysize
, cookie
->signature
))
1338 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1339 struct sctp_association
*sctp_unpack_cookie(
1340 const struct sctp_endpoint
*ep
,
1341 const struct sctp_association
*asoc
,
1342 struct sctp_chunk
*chunk
, gfp_t gfp
,
1343 int *error
, struct sctp_chunk
**errp
)
1345 struct sctp_association
*retval
= NULL
;
1346 struct sctp_signed_cookie
*cookie
;
1347 struct sctp_cookie
*bear_cookie
;
1348 int headersize
, bodysize
, fixed_size
;
1349 __u8
*digest
= ep
->digest
;
1350 struct scatterlist sg
;
1351 unsigned int keylen
, len
;
1354 struct sk_buff
*skb
= chunk
->skb
;
1356 struct hash_desc desc
;
1358 /* Header size is static data prior to the actual cookie, including
1361 headersize
= sizeof(sctp_chunkhdr_t
) +
1362 (sizeof(struct sctp_signed_cookie
) -
1363 sizeof(struct sctp_cookie
));
1364 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1365 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1367 /* Verify that the chunk looks like it even has a cookie.
1368 * There must be enough room for our cookie and our peer's
1371 len
= ntohs(chunk
->chunk_hdr
->length
);
1372 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1375 /* Verify that the cookie has been padded out. */
1376 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1379 /* Process the cookie. */
1380 cookie
= chunk
->subh
.cookie_hdr
;
1381 bear_cookie
= &cookie
->c
;
1383 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1386 /* Check the signature. */
1387 keylen
= SCTP_SECRET_SIZE
;
1388 sg
.page
= virt_to_page(bear_cookie
);
1389 sg
.offset
= (unsigned long)(bear_cookie
) % PAGE_SIZE
;
1390 sg
.length
= bodysize
;
1391 key
= (char *)ep
->secret_key
[ep
->current_key
];
1392 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1395 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1396 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1397 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1398 *error
= -SCTP_IERROR_NOMEM
;
1402 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1403 /* Try the previous key. */
1404 key
= (char *)ep
->secret_key
[ep
->last_key
];
1405 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1406 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1407 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1408 *error
= -SCTP_IERROR_NOMEM
;
1412 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1413 /* Yikes! Still bad signature! */
1414 *error
= -SCTP_IERROR_BAD_SIG
;
1420 /* IG Section 2.35.2:
1421 * 3) Compare the port numbers and the verification tag contained
1422 * within the COOKIE ECHO chunk to the actual port numbers and the
1423 * verification tag within the SCTP common header of the received
1424 * packet. If these values do not match the packet MUST be silently
1427 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1428 *error
= -SCTP_IERROR_BAD_TAG
;
1432 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1433 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1434 *error
= -SCTP_IERROR_BAD_PORTS
;
1438 /* Check to see if the cookie is stale. If there is already
1439 * an association, there is no need to check cookie's expiration
1440 * for init collision case of lost COOKIE ACK.
1441 * If skb has been timestamped, then use the stamp, otherwise
1442 * use current time. This introduces a small possibility that
1443 * that a cookie may be considered expired, but his would only slow
1444 * down the new association establishment instead of every packet.
1446 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1447 skb_get_timestamp(skb
, &tv
);
1449 do_gettimeofday(&tv
);
1451 if (!asoc
&& tv_lt(bear_cookie
->expiration
, tv
)) {
1453 * Section 3.3.10.3 Stale Cookie Error (3)
1457 * Stale Cookie Error: Indicates the receipt of a valid State
1458 * Cookie that has expired.
1460 len
= ntohs(chunk
->chunk_hdr
->length
);
1461 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1463 suseconds_t usecs
= (tv
.tv_sec
-
1464 bear_cookie
->expiration
.tv_sec
) * 1000000L +
1465 tv
.tv_usec
- bear_cookie
->expiration
.tv_usec
;
1466 __be32 n
= htonl(usecs
);
1468 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1470 *error
= -SCTP_IERROR_STALE_COOKIE
;
1472 *error
= -SCTP_IERROR_NOMEM
;
1477 /* Make a new base association. */
1478 scope
= sctp_scope(sctp_source(chunk
));
1479 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1481 *error
= -SCTP_IERROR_NOMEM
;
1485 /* Set up our peer's port number. */
1486 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1488 /* Populate the association from the cookie. */
1489 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1491 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1493 *error
= -SCTP_IERROR_NOMEM
;
1497 /* Also, add the destination address. */
1498 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1499 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
, 1,
1503 retval
->next_tsn
= retval
->c
.initial_tsn
;
1504 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1505 retval
->addip_serial
= retval
->c
.initial_tsn
;
1506 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1507 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1508 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1510 /* The INIT stuff will be done by the side effects. */
1515 sctp_association_free(retval
);
1520 /* Yikes! The packet is either corrupt or deliberately
1523 *error
= -SCTP_IERROR_MALFORMED
;
1527 /********************************************************************
1528 * 3rd Level Abstractions
1529 ********************************************************************/
1531 struct __sctp_missing
{
1534 } __attribute__((packed
));
1537 * Report a missing mandatory parameter.
1539 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1540 sctp_param_t paramtype
,
1541 struct sctp_chunk
*chunk
,
1542 struct sctp_chunk
**errp
)
1544 struct __sctp_missing report
;
1547 len
= WORD_ROUND(sizeof(report
));
1549 /* Make an ERROR chunk, preparing enough room for
1550 * returning multiple unknown parameters.
1553 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1556 report
.num_missing
= htonl(1);
1557 report
.type
= paramtype
;
1558 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1559 &report
, sizeof(report
));
1562 /* Stop processing this chunk. */
1566 /* Report an Invalid Mandatory Parameter. */
1567 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1568 struct sctp_chunk
*chunk
,
1569 struct sctp_chunk
**errp
)
1571 /* Invalid Mandatory Parameter Error has no payload. */
1574 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1577 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, NULL
, 0);
1579 /* Stop processing this chunk. */
1583 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1584 struct sctp_paramhdr
*param
,
1585 const struct sctp_chunk
*chunk
,
1586 struct sctp_chunk
**errp
)
1588 char error
[] = "The following parameter had invalid length:";
1589 size_t payload_len
= WORD_ROUND(sizeof(error
)) +
1590 sizeof(sctp_paramhdr_t
);
1593 /* Create an error chunk and fill it in with our payload. */
1595 *errp
= sctp_make_op_error_space(asoc
, chunk
, payload_len
);
1598 sctp_init_cause(*errp
, SCTP_ERROR_PROTO_VIOLATION
, error
,
1600 sctp_addto_chunk(*errp
, sizeof(sctp_paramhdr_t
), param
);
1607 /* Do not attempt to handle the HOST_NAME parm. However, do
1608 * send back an indicator to the peer.
1610 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1611 union sctp_params param
,
1612 struct sctp_chunk
*chunk
,
1613 struct sctp_chunk
**errp
)
1615 __u16 len
= ntohs(param
.p
->length
);
1617 /* Make an ERROR chunk. */
1619 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1622 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
,
1625 /* Stop processing this chunk. */
1629 /* RFC 3.2.1 & the Implementers Guide 2.2.
1631 * The Parameter Types are encoded such that the
1632 * highest-order two bits specify the action that must be
1633 * taken if the processing endpoint does not recognize the
1636 * 00 - Stop processing this SCTP chunk and discard it,
1637 * do not process any further chunks within it.
1639 * 01 - Stop processing this SCTP chunk and discard it,
1640 * do not process any further chunks within it, and report
1641 * the unrecognized parameter in an 'Unrecognized
1642 * Parameter Type' (in either an ERROR or in the INIT ACK).
1644 * 10 - Skip this parameter and continue processing.
1646 * 11 - Skip this parameter and continue processing but
1647 * report the unrecognized parameter in an
1648 * 'Unrecognized Parameter Type' (in either an ERROR or in
1652 * 0 - discard the chunk
1653 * 1 - continue with the chunk
1655 static int sctp_process_unk_param(const struct sctp_association
*asoc
,
1656 union sctp_params param
,
1657 struct sctp_chunk
*chunk
,
1658 struct sctp_chunk
**errp
)
1662 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
1663 case SCTP_PARAM_ACTION_DISCARD
:
1666 case SCTP_PARAM_ACTION_DISCARD_ERR
:
1668 /* Make an ERROR chunk, preparing enough room for
1669 * returning multiple unknown parameters.
1672 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1673 ntohs(chunk
->chunk_hdr
->length
));
1676 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1678 WORD_ROUND(ntohs(param
.p
->length
)));
1681 case SCTP_PARAM_ACTION_SKIP
:
1683 case SCTP_PARAM_ACTION_SKIP_ERR
:
1684 /* Make an ERROR chunk, preparing enough room for
1685 * returning multiple unknown parameters.
1688 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1689 ntohs(chunk
->chunk_hdr
->length
));
1692 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1694 WORD_ROUND(ntohs(param
.p
->length
)));
1696 /* If there is no memory for generating the ERROR
1697 * report as specified, an ABORT will be triggered
1698 * to the peer and the association won't be
1712 /* Find unrecognized parameters in the chunk.
1714 * 0 - discard the chunk
1715 * 1 - continue with the chunk
1717 static int sctp_verify_param(const struct sctp_association
*asoc
,
1718 union sctp_params param
,
1720 struct sctp_chunk
*chunk
,
1721 struct sctp_chunk
**err_chunk
)
1725 /* FIXME - This routine is not looking at each parameter per the
1726 * chunk type, i.e., unrecognized parameters should be further
1727 * identified based on the chunk id.
1730 switch (param
.p
->type
) {
1731 case SCTP_PARAM_IPV4_ADDRESS
:
1732 case SCTP_PARAM_IPV6_ADDRESS
:
1733 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
1734 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
1735 case SCTP_PARAM_STATE_COOKIE
:
1736 case SCTP_PARAM_HEARTBEAT_INFO
:
1737 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
1738 case SCTP_PARAM_ECN_CAPABLE
:
1739 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
1742 case SCTP_PARAM_HOST_NAME_ADDRESS
:
1743 /* Tell the peer, we won't support this param. */
1744 return sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
1745 case SCTP_PARAM_FWD_TSN_SUPPORT
:
1746 if (sctp_prsctp_enable
)
1750 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
1751 ntohs(param
.p
->type
), cid
);
1752 return sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
1759 /* Verify the INIT packet before we process it. */
1760 int sctp_verify_init(const struct sctp_association
*asoc
,
1762 sctp_init_chunk_t
*peer_init
,
1763 struct sctp_chunk
*chunk
,
1764 struct sctp_chunk
**errp
)
1766 union sctp_params param
;
1769 /* Verify stream values are non-zero. */
1770 if ((0 == peer_init
->init_hdr
.num_outbound_streams
) ||
1771 (0 == peer_init
->init_hdr
.num_inbound_streams
) ||
1772 (0 == peer_init
->init_hdr
.init_tag
) ||
1773 (SCTP_DEFAULT_MINWINDOW
> ntohl(peer_init
->init_hdr
.a_rwnd
))) {
1775 sctp_process_inv_mandatory(asoc
, chunk
, errp
);
1779 /* Check for missing mandatory parameters. */
1780 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1782 if (SCTP_PARAM_STATE_COOKIE
== param
.p
->type
)
1785 } /* for (loop through all parameters) */
1787 /* There is a possibility that a parameter length was bad and
1788 * in that case we would have stoped walking the parameters.
1789 * The current param.p would point at the bad one.
1790 * Current consensus on the mailing list is to generate a PROTOCOL
1791 * VIOLATION error. We build the ERROR chunk here and let the normal
1792 * error handling code build and send the packet.
1794 if (param
.v
< (void*)chunk
->chunk_end
- sizeof(sctp_paramhdr_t
)) {
1795 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
1799 /* The only missing mandatory param possible today is
1800 * the state cookie for an INIT-ACK chunk.
1802 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
) {
1803 sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
1808 /* Find unrecognized parameters. */
1810 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1812 if (!sctp_verify_param(asoc
, param
, cid
, chunk
, errp
)) {
1813 if (SCTP_PARAM_HOST_NAME_ADDRESS
== param
.p
->type
)
1819 } /* for (loop through all parameters) */
1824 /* Unpack the parameters in an INIT packet into an association.
1825 * Returns 0 on failure, else success.
1826 * FIXME: This is an association method.
1828 int sctp_process_init(struct sctp_association
*asoc
, sctp_cid_t cid
,
1829 const union sctp_addr
*peer_addr
,
1830 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
1832 union sctp_params param
;
1833 struct sctp_transport
*transport
;
1834 struct list_head
*pos
, *temp
;
1837 /* We must include the address that the INIT packet came from.
1838 * This is the only address that matters for an INIT packet.
1839 * When processing a COOKIE ECHO, we retrieve the from address
1840 * of the INIT from the cookie.
1843 /* This implementation defaults to making the first transport
1844 * added as the primary transport. The source address seems to
1845 * be a a better choice than any of the embedded addresses.
1848 if(!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
1852 /* Process the initialization parameters. */
1854 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1856 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
1860 /* Walk list of transports, removing transports in the UNKNOWN state. */
1861 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
1862 transport
= list_entry(pos
, struct sctp_transport
, transports
);
1863 if (transport
->state
== SCTP_UNKNOWN
) {
1864 sctp_assoc_rm_peer(asoc
, transport
);
1868 /* The fixed INIT headers are always in network byte
1871 asoc
->peer
.i
.init_tag
=
1872 ntohl(peer_init
->init_hdr
.init_tag
);
1873 asoc
->peer
.i
.a_rwnd
=
1874 ntohl(peer_init
->init_hdr
.a_rwnd
);
1875 asoc
->peer
.i
.num_outbound_streams
=
1876 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
1877 asoc
->peer
.i
.num_inbound_streams
=
1878 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
1879 asoc
->peer
.i
.initial_tsn
=
1880 ntohl(peer_init
->init_hdr
.initial_tsn
);
1882 /* Apply the upper bounds for output streams based on peer's
1883 * number of inbound streams.
1885 if (asoc
->c
.sinit_num_ostreams
>
1886 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
1887 asoc
->c
.sinit_num_ostreams
=
1888 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
1891 if (asoc
->c
.sinit_max_instreams
>
1892 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
1893 asoc
->c
.sinit_max_instreams
=
1894 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
1897 /* Copy Initiation tag from INIT to VT_peer in cookie. */
1898 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
1900 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
1901 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
1903 /* Copy cookie in case we need to resend COOKIE-ECHO. */
1904 cookie
= asoc
->peer
.cookie
;
1906 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
1907 if (!asoc
->peer
.cookie
)
1911 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
1912 * high (for example, implementations MAY use the size of the receiver
1913 * advertised window).
1915 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
1916 transport
= list_entry(pos
, struct sctp_transport
, transports
);
1917 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
1920 /* Set up the TSN tracking pieces. */
1921 sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_SIZE
,
1922 asoc
->peer
.i
.initial_tsn
);
1924 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
1926 * The stream sequence number in all the streams shall start
1927 * from 0 when the association is established. Also, when the
1928 * stream sequence number reaches the value 65535 the next
1929 * stream sequence number shall be set to 0.
1932 /* Allocate storage for the negotiated streams if it is not a temporary
1938 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
1939 asoc
->c
.sinit_num_ostreams
, gfp
);
1943 error
= sctp_assoc_set_id(asoc
, gfp
);
1948 /* ADDIP Section 4.1 ASCONF Chunk Procedures
1950 * When an endpoint has an ASCONF signaled change to be sent to the
1951 * remote endpoint it should do the following:
1953 * A2) A serial number should be assigned to the Chunk. The serial
1954 * number should be a monotonically increasing number. All serial
1955 * numbers are defined to be initialized at the start of the
1956 * association to the same value as the Initial TSN.
1958 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
1962 /* Release the transport structures. */
1963 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
1964 transport
= list_entry(pos
, struct sctp_transport
, transports
);
1966 sctp_transport_free(transport
);
1969 asoc
->peer
.transport_count
= 0;
1976 /* Update asoc with the option described in param.
1978 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
1980 * asoc is the association to update.
1981 * param is the variable length parameter to use for update.
1982 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
1983 * If the current packet is an INIT we want to minimize the amount of
1984 * work we do. In particular, we should not build transport
1985 * structures for the addresses.
1987 static int sctp_process_param(struct sctp_association
*asoc
,
1988 union sctp_params param
,
1989 const union sctp_addr
*peer_addr
,
1992 union sctp_addr addr
;
2000 /* We maintain all INIT parameters in network byte order all the
2001 * time. This allows us to not worry about whether the parameters
2002 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2004 switch (param
.p
->type
) {
2005 case SCTP_PARAM_IPV6_ADDRESS
:
2006 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2009 case SCTP_PARAM_IPV4_ADDRESS
:
2010 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2011 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2012 scope
= sctp_scope(peer_addr
);
2013 if (sctp_in_scope(&addr
, scope
))
2014 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2018 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2019 if (!sctp_cookie_preserve_enable
)
2022 stale
= ntohl(param
.life
->lifespan_increment
);
2024 /* Suggested Cookie Life span increment's unit is msec,
2027 asoc
->cookie_life
.tv_sec
+= stale
/ 1000;
2028 asoc
->cookie_life
.tv_usec
+= (stale
% 1000) * 1000;
2031 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2032 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2035 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2036 /* Turn off the default values first so we'll know which
2037 * ones are really set by the peer.
2039 asoc
->peer
.ipv4_address
= 0;
2040 asoc
->peer
.ipv6_address
= 0;
2042 /* Cycle through address types; avoid divide by 0. */
2043 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2045 sat
/= sizeof(__u16
);
2047 for (i
= 0; i
< sat
; ++i
) {
2048 switch (param
.sat
->types
[i
]) {
2049 case SCTP_PARAM_IPV4_ADDRESS
:
2050 asoc
->peer
.ipv4_address
= 1;
2053 case SCTP_PARAM_IPV6_ADDRESS
:
2054 asoc
->peer
.ipv6_address
= 1;
2057 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2058 asoc
->peer
.hostname_address
= 1;
2061 default: /* Just ignore anything else. */
2067 case SCTP_PARAM_STATE_COOKIE
:
2068 asoc
->peer
.cookie_len
=
2069 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2070 asoc
->peer
.cookie
= param
.cookie
->body
;
2073 case SCTP_PARAM_HEARTBEAT_INFO
:
2074 /* Would be odd to receive, but it causes no problems. */
2077 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2078 /* Rejected during verify stage. */
2081 case SCTP_PARAM_ECN_CAPABLE
:
2082 asoc
->peer
.ecn_capable
= 1;
2085 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2086 asoc
->peer
.adaptation_ind
= param
.aind
->adaptation_ind
;
2089 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2090 if (sctp_prsctp_enable
) {
2091 asoc
->peer
.prsctp_capable
= 1;
2096 /* Any unrecognized parameters should have been caught
2097 * and handled by sctp_verify_param() which should be
2098 * called prior to this routine. Simply log the error
2101 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2102 ntohs(param
.p
->type
), asoc
);
2109 /* Select a new verification tag. */
2110 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2112 /* I believe that this random number generator complies with RFC1750.
2113 * A tag of 0 is reserved for special cases (e.g. INIT).
2118 get_random_bytes(&x
, sizeof(__u32
));
2124 /* Select an initial TSN to send during startup. */
2125 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2129 get_random_bytes(&retval
, sizeof(__u32
));
2134 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2136 * 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
2137 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2138 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2139 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2141 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2142 * | Address Parameter |
2143 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2144 * | ASCONF Parameter #1 |
2145 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2149 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2150 * | ASCONF Parameter #N |
2151 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2153 * Address Parameter and other parameter will not be wrapped in this function
2155 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2156 union sctp_addr
*addr
,
2159 sctp_addiphdr_t asconf
;
2160 struct sctp_chunk
*retval
;
2161 int length
= sizeof(asconf
) + vparam_len
;
2162 union sctp_addr_param addrparam
;
2164 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2166 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2171 /* Create the chunk. */
2172 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF
, 0, length
);
2176 asconf
.serial
= htonl(asoc
->addip_serial
++);
2178 retval
->subh
.addip_hdr
=
2179 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2180 retval
->param_hdr
.v
=
2181 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2187 * 3.2.1 Add IP Address
2189 * 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
2190 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2191 * | Type = 0xC001 | Length = Variable |
2192 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2193 * | ASCONF-Request Correlation ID |
2194 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2195 * | Address Parameter |
2196 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2198 * 3.2.2 Delete IP Address
2200 * 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
2201 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2202 * | Type = 0xC002 | Length = Variable |
2203 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2204 * | ASCONF-Request Correlation ID |
2205 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2206 * | Address Parameter |
2207 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2210 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2211 union sctp_addr
*laddr
,
2212 struct sockaddr
*addrs
,
2216 sctp_addip_param_t param
;
2217 struct sctp_chunk
*retval
;
2218 union sctp_addr_param addr_param
;
2219 union sctp_addr
*addr
;
2222 int paramlen
= sizeof(param
);
2223 int addr_param_len
= 0;
2227 /* Get total length of all the address parameters. */
2229 for (i
= 0; i
< addrcnt
; i
++) {
2230 addr
= (union sctp_addr
*)addr_buf
;
2231 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2232 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2234 totallen
+= paramlen
;
2235 totallen
+= addr_param_len
;
2237 addr_buf
+= af
->sockaddr_len
;
2240 /* Create an asconf chunk with the required length. */
2241 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2245 /* Add the address parameters to the asconf chunk. */
2247 for (i
= 0; i
< addrcnt
; i
++) {
2248 addr
= (union sctp_addr
*)addr_buf
;
2249 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2250 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2251 param
.param_hdr
.type
= flags
;
2252 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2255 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2256 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2258 addr_buf
+= af
->sockaddr_len
;
2264 * 3.2.4 Set Primary IP Address
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 =0xC004 | Length = Variable |
2269 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2270 * | ASCONF-Request Correlation ID |
2271 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2272 * | Address Parameter |
2273 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2275 * Create an ASCONF chunk with Set Primary IP address parameter.
2277 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2278 union sctp_addr
*addr
)
2280 sctp_addip_param_t param
;
2281 struct sctp_chunk
*retval
;
2282 int len
= sizeof(param
);
2283 union sctp_addr_param addrparam
;
2285 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2287 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2292 /* Create the chunk and make asconf header. */
2293 retval
= sctp_make_asconf(asoc
, addr
, len
);
2297 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2298 param
.param_hdr
.length
= htons(len
);
2301 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2302 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2307 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2309 * 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
2310 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2311 * | Type = 0x80 | Chunk Flags | Chunk Length |
2312 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2314 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2315 * | ASCONF Parameter Response#1 |
2316 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2320 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2321 * | ASCONF Parameter Response#N |
2322 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2324 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2326 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2327 __u32 serial
, int vparam_len
)
2329 sctp_addiphdr_t asconf
;
2330 struct sctp_chunk
*retval
;
2331 int length
= sizeof(asconf
) + vparam_len
;
2333 /* Create the chunk. */
2334 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
);
2338 asconf
.serial
= htonl(serial
);
2340 retval
->subh
.addip_hdr
=
2341 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2346 /* Add response parameters to an ASCONF_ACK chunk. */
2347 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2348 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2350 sctp_addip_param_t ack_param
;
2351 sctp_errhdr_t err_param
;
2352 int asconf_param_len
= 0;
2353 int err_param_len
= 0;
2354 __be16 response_type
;
2356 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2357 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2359 response_type
= SCTP_PARAM_ERR_CAUSE
;
2360 err_param_len
= sizeof(err_param
);
2363 ntohs(asconf_param
->param_hdr
.length
);
2366 /* Add Success Indication or Error Cause Indication parameter. */
2367 ack_param
.param_hdr
.type
= response_type
;
2368 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2371 ack_param
.crr_id
= crr_id
;
2372 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2374 if (SCTP_ERROR_NO_ERROR
== err_code
)
2377 /* Add Error Cause parameter. */
2378 err_param
.cause
= err_code
;
2379 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2380 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2382 /* Add the failed TLV copied from ASCONF chunk. */
2384 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
2387 /* Process a asconf parameter. */
2388 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
2389 struct sctp_chunk
*asconf
,
2390 sctp_addip_param_t
*asconf_param
)
2392 struct sctp_transport
*peer
;
2394 union sctp_addr addr
;
2395 struct list_head
*pos
;
2396 union sctp_addr_param
*addr_param
;
2398 addr_param
= (union sctp_addr_param
*)
2399 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2401 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2403 return SCTP_ERROR_INV_PARAM
;
2405 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
2406 switch (asconf_param
->param_hdr
.type
) {
2407 case SCTP_PARAM_ADD_IP
:
2408 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
2409 * request and does not have the local resources to add this
2410 * new address to the association, it MUST return an Error
2411 * Cause TLV set to the new error code 'Operation Refused
2412 * Due to Resource Shortage'.
2415 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
2417 return SCTP_ERROR_RSRC_LOW
;
2419 /* Start the heartbeat timer. */
2420 if (!mod_timer(&peer
->hb_timer
, sctp_transport_timeout(peer
)))
2421 sctp_transport_hold(peer
);
2423 case SCTP_PARAM_DEL_IP
:
2424 /* ADDIP 4.3 D7) If a request is received to delete the
2425 * last remaining IP address of a peer endpoint, the receiver
2426 * MUST send an Error Cause TLV with the error cause set to the
2427 * new error code 'Request to Delete Last Remaining IP Address'.
2429 pos
= asoc
->peer
.transport_addr_list
.next
;
2430 if (pos
->next
== &asoc
->peer
.transport_addr_list
)
2431 return SCTP_ERROR_DEL_LAST_IP
;
2433 /* ADDIP 4.3 D8) If a request is received to delete an IP
2434 * address which is also the source address of the IP packet
2435 * which contained the ASCONF chunk, the receiver MUST reject
2436 * this request. To reject the request the receiver MUST send
2437 * an Error Cause TLV set to the new error code 'Request to
2438 * Delete Source IP Address'
2440 if (sctp_cmp_addr_exact(sctp_source(asconf
), &addr
))
2441 return SCTP_ERROR_DEL_SRC_IP
;
2443 sctp_assoc_del_peer(asoc
, &addr
);
2445 case SCTP_PARAM_SET_PRIMARY
:
2446 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2448 return SCTP_ERROR_INV_PARAM
;
2450 sctp_assoc_set_primary(asoc
, peer
);
2453 return SCTP_ERROR_INV_PARAM
;
2457 return SCTP_ERROR_NO_ERROR
;
2460 /* Process an incoming ASCONF chunk with the next expected serial no. and
2461 * return an ASCONF_ACK chunk to be sent in response.
2463 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
2464 struct sctp_chunk
*asconf
)
2466 sctp_addiphdr_t
*hdr
;
2467 union sctp_addr_param
*addr_param
;
2468 sctp_addip_param_t
*asconf_param
;
2469 struct sctp_chunk
*asconf_ack
;
2473 int chunk_len
= asconf
->skb
->len
;
2475 int all_param_pass
= 1;
2477 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
2478 serial
= ntohl(hdr
->serial
);
2480 /* Skip the addiphdr and store a pointer to address parameter. */
2481 length
= sizeof(sctp_addiphdr_t
);
2482 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
2483 chunk_len
-= length
;
2485 /* Skip the address parameter and store a pointer to the first
2488 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
2489 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
2490 chunk_len
-= length
;
2492 /* create an ASCONF_ACK chunk.
2493 * Based on the definitions of parameters, we know that the size of
2494 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
2497 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 2);
2501 /* Process the TLVs contained within the ASCONF chunk. */
2502 while (chunk_len
> 0) {
2503 err_code
= sctp_process_asconf_param(asoc
, asconf
,
2506 * If an error response is received for a TLV parameter,
2507 * all TLVs with no response before the failed TLV are
2508 * considered successful if not reported. All TLVs after
2509 * the failed response are considered unsuccessful unless
2510 * a specific success indication is present for the parameter.
2512 if (SCTP_ERROR_NO_ERROR
!= err_code
)
2515 if (!all_param_pass
)
2516 sctp_add_asconf_response(asconf_ack
,
2517 asconf_param
->crr_id
, err_code
,
2520 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
2521 * an IP address sends an 'Out of Resource' in its response, it
2522 * MUST also fail any subsequent add or delete requests bundled
2525 if (SCTP_ERROR_RSRC_LOW
== err_code
)
2528 /* Move to the next ASCONF param. */
2529 length
= ntohs(asconf_param
->param_hdr
.length
);
2530 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
2532 chunk_len
-= length
;
2536 asoc
->peer
.addip_serial
++;
2538 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
2539 * after freeing the reference to old asconf ack if any.
2542 if (asoc
->addip_last_asconf_ack
)
2543 sctp_chunk_free(asoc
->addip_last_asconf_ack
);
2545 sctp_chunk_hold(asconf_ack
);
2546 asoc
->addip_last_asconf_ack
= asconf_ack
;
2552 /* Process a asconf parameter that is successfully acked. */
2553 static int sctp_asconf_param_success(struct sctp_association
*asoc
,
2554 sctp_addip_param_t
*asconf_param
)
2557 union sctp_addr addr
;
2558 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
2559 union sctp_addr_param
*addr_param
;
2560 struct list_head
*pos
;
2561 struct sctp_transport
*transport
;
2562 struct sctp_sockaddr_entry
*saddr
;
2565 addr_param
= (union sctp_addr_param
*)
2566 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2568 /* We have checked the packet before, so we do not check again. */
2569 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2570 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
2572 switch (asconf_param
->param_hdr
.type
) {
2573 case SCTP_PARAM_ADD_IP
:
2574 sctp_local_bh_disable();
2575 sctp_write_lock(&asoc
->base
.addr_lock
);
2576 list_for_each(pos
, &bp
->address_list
) {
2577 saddr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
2578 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
2579 saddr
->use_as_src
= 1;
2581 sctp_write_unlock(&asoc
->base
.addr_lock
);
2582 sctp_local_bh_enable();
2584 case SCTP_PARAM_DEL_IP
:
2585 sctp_local_bh_disable();
2586 sctp_write_lock(&asoc
->base
.addr_lock
);
2587 retval
= sctp_del_bind_addr(bp
, &addr
);
2588 sctp_write_unlock(&asoc
->base
.addr_lock
);
2589 sctp_local_bh_enable();
2590 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2591 transport
= list_entry(pos
, struct sctp_transport
,
2593 dst_release(transport
->dst
);
2594 sctp_transport_route(transport
, NULL
,
2595 sctp_sk(asoc
->base
.sk
));
2605 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
2606 * for the given asconf parameter. If there is no response for this parameter,
2607 * return the error code based on the third argument 'no_err'.
2609 * A7) If an error response is received for a TLV parameter, all TLVs with no
2610 * response before the failed TLV are considered successful if not reported.
2611 * All TLVs after the failed response are considered unsuccessful unless a
2612 * specific success indication is present for the parameter.
2614 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
2615 sctp_addip_param_t
*asconf_param
,
2618 sctp_addip_param_t
*asconf_ack_param
;
2619 sctp_errhdr_t
*err_param
;
2621 int asconf_ack_len
= asconf_ack
->skb
->len
;
2625 err_code
= SCTP_ERROR_NO_ERROR
;
2627 err_code
= SCTP_ERROR_REQ_REFUSED
;
2629 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
2630 * the first asconf_ack parameter.
2632 length
= sizeof(sctp_addiphdr_t
);
2633 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
2635 asconf_ack_len
-= length
;
2637 while (asconf_ack_len
> 0) {
2638 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
2639 switch(asconf_ack_param
->param_hdr
.type
) {
2640 case SCTP_PARAM_SUCCESS_REPORT
:
2641 return SCTP_ERROR_NO_ERROR
;
2642 case SCTP_PARAM_ERR_CAUSE
:
2643 length
= sizeof(sctp_addip_param_t
);
2644 err_param
= (sctp_errhdr_t
*)
2645 ((void *)asconf_ack_param
+ length
);
2646 asconf_ack_len
-= length
;
2647 if (asconf_ack_len
> 0)
2648 return err_param
->cause
;
2650 return SCTP_ERROR_INV_PARAM
;
2653 return SCTP_ERROR_INV_PARAM
;
2657 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
2658 asconf_ack_param
= (sctp_addip_param_t
*)
2659 ((void *)asconf_ack_param
+ length
);
2660 asconf_ack_len
-= length
;
2666 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
2667 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
2668 struct sctp_chunk
*asconf_ack
)
2670 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
2671 union sctp_addr_param
*addr_param
;
2672 sctp_addip_param_t
*asconf_param
;
2674 int asconf_len
= asconf
->skb
->len
;
2675 int all_param_pass
= 0;
2678 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
2680 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
2681 * a pointer to address parameter.
2683 length
= sizeof(sctp_addip_chunk_t
);
2684 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
2685 asconf_len
-= length
;
2687 /* Skip the address parameter in the last asconf sent and store a
2688 * pointer to the first asconf paramter.
2690 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
2691 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
2692 asconf_len
-= length
;
2695 * A8) If there is no response(s) to specific TLV parameter(s), and no
2696 * failures are indicated, then all request(s) are considered
2699 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
2702 /* Process the TLVs contained in the last sent ASCONF chunk. */
2703 while (asconf_len
> 0) {
2705 err_code
= SCTP_ERROR_NO_ERROR
;
2707 err_code
= sctp_get_asconf_response(asconf_ack
,
2710 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
2715 case SCTP_ERROR_NO_ERROR
:
2716 retval
= sctp_asconf_param_success(asoc
, asconf_param
);
2719 case SCTP_ERROR_RSRC_LOW
:
2723 case SCTP_ERROR_INV_PARAM
:
2724 /* Disable sending this type of asconf parameter in
2727 asoc
->peer
.addip_disabled_mask
|=
2728 asconf_param
->param_hdr
.type
;
2731 case SCTP_ERROR_REQ_REFUSED
:
2732 case SCTP_ERROR_DEL_LAST_IP
:
2733 case SCTP_ERROR_DEL_SRC_IP
:
2738 /* Skip the processed asconf parameter and move to the next
2741 length
= ntohs(asconf_param
->param_hdr
.length
);
2742 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
2744 asconf_len
-= length
;
2747 /* Free the cached last sent asconf chunk. */
2748 sctp_chunk_free(asconf
);
2749 asoc
->addip_last_asconf
= NULL
;
2751 /* Send the next asconf chunk from the addip chunk queue. */
2752 if (!list_empty(&asoc
->addip_chunk_list
)) {
2753 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
2754 asconf
= list_entry(entry
, struct sctp_chunk
, list
);
2756 list_del_init(entry
);
2758 /* Hold the chunk until an ASCONF_ACK is received. */
2759 sctp_chunk_hold(asconf
);
2760 if (sctp_primitive_ASCONF(asoc
, asconf
))
2761 sctp_chunk_free(asconf
);
2763 asoc
->addip_last_asconf
= asconf
;
2769 /* Make a FWD TSN chunk. */
2770 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
2771 __u32 new_cum_tsn
, size_t nstreams
,
2772 struct sctp_fwdtsn_skip
*skiplist
)
2774 struct sctp_chunk
*retval
= NULL
;
2775 struct sctp_fwdtsn_chunk
*ftsn_chunk
;
2776 struct sctp_fwdtsn_hdr ftsn_hdr
;
2777 struct sctp_fwdtsn_skip skip
;
2781 hint
= (nstreams
+ 1) * sizeof(__u32
);
2783 retval
= sctp_make_chunk(asoc
, SCTP_CID_FWD_TSN
, 0, hint
);
2788 ftsn_chunk
= (struct sctp_fwdtsn_chunk
*)retval
->subh
.fwdtsn_hdr
;
2790 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
2791 retval
->subh
.fwdtsn_hdr
=
2792 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
2794 for (i
= 0; i
< nstreams
; i
++) {
2795 skip
.stream
= skiplist
[i
].stream
;
2796 skip
.ssn
= skiplist
[i
].ssn
;
2797 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);