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
, __be16 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 gfp_t 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
);
261 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
262 const struct sctp_chunk
*chunk
,
263 gfp_t gfp
, int unkparam_len
)
265 sctp_inithdr_t initack
;
266 struct sctp_chunk
*retval
;
267 union sctp_params addrs
;
269 sctp_cookie_param_t
*cookie
;
272 sctp_adaption_ind_param_t aiparam
;
276 /* Note: there may be no addresses to embed. */
277 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
279 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
280 initack
.a_rwnd
= htonl(asoc
->rwnd
);
281 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
282 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
283 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
285 /* FIXME: We really ought to build the cookie right
286 * into the packet instead of allocating more fresh memory.
288 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
293 /* Calculate the total size of allocation, include the reserved
294 * space for reporting unknown parameters if it is specified.
296 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
298 /* Tell peer that we'll do ECN only if peer advertised such cap. */
299 if (asoc
->peer
.ecn_capable
)
300 chunksize
+= sizeof(ecap_param
);
302 /* Tell peer that we'll do PR-SCTP only if peer advertised. */
303 if (asoc
->peer
.prsctp_capable
)
304 chunksize
+= sizeof(prsctp_param
);
306 chunksize
+= sizeof(aiparam
);
308 /* Now allocate and fill out the chunk. */
309 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
);
313 /* Per the advice in RFC 2960 6.4, send this reply to
314 * the source of the INIT packet.
316 retval
->transport
= chunk
->transport
;
317 retval
->subh
.init_hdr
=
318 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
319 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
320 sctp_addto_chunk(retval
, cookie_len
, cookie
);
321 if (asoc
->peer
.ecn_capable
)
322 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
323 if (asoc
->peer
.prsctp_capable
)
324 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
326 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTION_LAYER_IND
;
327 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
328 aiparam
.adaption_ind
= htonl(sctp_sk(asoc
->base
.sk
)->adaption_ind
);
329 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
331 /* We need to remove the const qualifier at this point. */
332 retval
->asoc
= (struct sctp_association
*) asoc
;
334 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
336 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
337 * HEARTBEAT ACK, * etc.) to the same destination transport
338 * address from which it received the DATA or control chunk
339 * to which it is replying.
341 * [INIT ACK back to where the INIT came from.]
344 retval
->transport
= chunk
->transport
;
353 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
355 * This chunk is used only during the initialization of an association.
356 * It is sent by the initiator of an association to its peer to complete
357 * the initialization process. This chunk MUST precede any DATA chunk
358 * sent within the association, but MAY be bundled with one or more DATA
359 * chunks in the same packet.
362 * 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
363 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
364 * | Type = 10 |Chunk Flags | Length |
365 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
368 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
372 * Set to zero on transmit and ignored on receipt.
374 * Length: 16 bits (unsigned integer)
376 * Set to the size of the chunk in bytes, including the 4 bytes of
377 * the chunk header and the size of the Cookie.
379 * Cookie: variable size
381 * This field must contain the exact cookie received in the
382 * State Cookie parameter from the previous INIT ACK.
384 * An implementation SHOULD make the cookie as small as possible
385 * to insure interoperability.
387 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
388 const struct sctp_chunk
*chunk
)
390 struct sctp_chunk
*retval
;
394 cookie
= asoc
->peer
.cookie
;
395 cookie_len
= asoc
->peer
.cookie_len
;
397 /* Build a cookie echo chunk. */
398 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ECHO
, 0, cookie_len
);
401 retval
->subh
.cookie_hdr
=
402 sctp_addto_chunk(retval
, cookie_len
, cookie
);
404 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
406 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
407 * HEARTBEAT ACK, * etc.) to the same destination transport
408 * address from which it * received the DATA or control chunk
409 * to which it is replying.
411 * [COOKIE ECHO back to where the INIT ACK came from.]
414 retval
->transport
= chunk
->transport
;
420 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
422 * This chunk is used only during the initialization of an
423 * association. It is used to acknowledge the receipt of a COOKIE
424 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
425 * within the association, but MAY be bundled with one or more DATA
426 * chunks or SACK chunk in the same SCTP packet.
429 * 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
430 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
431 * | Type = 11 |Chunk Flags | Length = 4 |
432 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
434 * Chunk Flags: 8 bits
436 * Set to zero on transmit and ignored on receipt.
438 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
439 const struct sctp_chunk
*chunk
)
441 struct sctp_chunk
*retval
;
443 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0);
445 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
447 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
448 * HEARTBEAT ACK, * etc.) to the same destination transport
449 * address from which it * received the DATA or control chunk
450 * to which it is replying.
452 * [COOKIE ACK back to where the COOKIE ECHO came from.]
455 retval
->transport
= chunk
->transport
;
461 * Appendix A: Explicit Congestion Notification:
464 * RFC 2481 details a specific bit for a sender to send in the header of
465 * its next outbound TCP segment to indicate to its peer that it has
466 * reduced its congestion window. This is termed the CWR bit. For
467 * SCTP the same indication is made by including the CWR chunk.
468 * This chunk contains one data element, i.e. the TSN number that
469 * was sent in the ECNE chunk. This element represents the lowest
470 * TSN number in the datagram that was originally marked with the
474 * 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
475 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
476 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
477 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
478 * | Lowest TSN Number |
479 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
481 * Note: The CWR is considered a Control chunk.
483 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
484 const __u32 lowest_tsn
,
485 const struct sctp_chunk
*chunk
)
487 struct sctp_chunk
*retval
;
490 cwr
.lowest_tsn
= htonl(lowest_tsn
);
491 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_CWR
, 0,
492 sizeof(sctp_cwrhdr_t
));
497 retval
->subh
.ecn_cwr_hdr
=
498 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
500 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
502 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
503 * HEARTBEAT ACK, * etc.) to the same destination transport
504 * address from which it * received the DATA or control chunk
505 * to which it is replying.
507 * [Report a reduced congestion window back to where the ECNE
511 retval
->transport
= chunk
->transport
;
517 /* Make an ECNE chunk. This is a congestion experienced report. */
518 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
519 const __u32 lowest_tsn
)
521 struct sctp_chunk
*retval
;
524 ecne
.lowest_tsn
= htonl(lowest_tsn
);
525 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_ECNE
, 0,
526 sizeof(sctp_ecnehdr_t
));
529 retval
->subh
.ecne_hdr
=
530 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
536 /* Make a DATA chunk for the given association from the provided
537 * parameters. However, do not populate the data payload.
539 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
540 const struct sctp_sndrcvinfo
*sinfo
,
541 int data_len
, __u8 flags
, __u16 ssn
)
543 struct sctp_chunk
*retval
;
544 struct sctp_datahdr dp
;
547 /* We assign the TSN as LATE as possible, not here when
548 * creating the chunk.
551 dp
.stream
= htons(sinfo
->sinfo_stream
);
552 dp
.ppid
= sinfo
->sinfo_ppid
;
554 /* Set the flags for an unordered send. */
555 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
556 flags
|= SCTP_DATA_UNORDERED
;
561 chunk_len
= sizeof(dp
) + data_len
;
562 retval
= sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, chunk_len
);
566 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
567 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
573 /* Create a selective ackowledgement (SACK) for the given
574 * association. This reports on which TSN's we've seen to date,
575 * including duplicates and gaps.
577 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
579 struct sctp_chunk
*retval
;
580 struct sctp_sackhdr sack
;
583 __u16 num_gabs
, num_dup_tsns
;
584 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
586 ctsn
= sctp_tsnmap_get_ctsn(map
);
587 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn
);
589 /* How much room is needed in the chunk? */
590 num_gabs
= sctp_tsnmap_num_gabs(map
);
591 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
593 /* Initialize the SACK header. */
594 sack
.cum_tsn_ack
= htonl(ctsn
);
595 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
596 sack
.num_gap_ack_blocks
= htons(num_gabs
);
597 sack
.num_dup_tsns
= htons(num_dup_tsns
);
600 + sizeof(struct sctp_gap_ack_block
) * num_gabs
601 + sizeof(__u32
) * num_dup_tsns
;
603 /* Create the chunk. */
604 retval
= sctp_make_chunk(asoc
, SCTP_CID_SACK
, 0, len
);
608 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
610 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
611 * HEARTBEAT ACK, etc.) to the same destination transport
612 * address from which it received the DATA or control chunk to
613 * which it is replying. This rule should also be followed if
614 * the endpoint is bundling DATA chunks together with the
617 * However, when acknowledging multiple DATA chunks received
618 * in packets from different source addresses in a single
619 * SACK, the SACK chunk may be transmitted to one of the
620 * destination transport addresses from which the DATA or
621 * control chunks being acknowledged were received.
623 * [BUG: We do not implement the following paragraph.
624 * Perhaps we should remember the last transport we used for a
625 * SACK and avoid that (if possible) if we have seen any
626 * duplicates. --piggy]
628 * When a receiver of a duplicate DATA chunk sends a SACK to a
629 * multi- homed endpoint it MAY be beneficial to vary the
630 * destination address and not use the source address of the
631 * DATA chunk. The reason being that receiving a duplicate
632 * from a multi-homed endpoint might indicate that the return
633 * path (as specified in the source address of the DATA chunk)
634 * for the SACK is broken.
636 * [Send to the address from which we last received a DATA chunk.]
638 retval
->transport
= asoc
->peer
.last_data_from
;
640 retval
->subh
.sack_hdr
=
641 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
643 /* Add the gap ack block information. */
645 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
646 sctp_tsnmap_get_gabs(map
));
648 /* Add the duplicate TSN information. */
650 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
651 sctp_tsnmap_get_dups(map
));
657 /* Make a SHUTDOWN chunk. */
658 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
659 const struct sctp_chunk
*chunk
)
661 struct sctp_chunk
*retval
;
662 sctp_shutdownhdr_t shut
;
665 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
666 shut
.cum_tsn_ack
= htonl(ctsn
);
668 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN
, 0,
669 sizeof(sctp_shutdownhdr_t
));
673 retval
->subh
.shutdown_hdr
=
674 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
677 retval
->transport
= chunk
->transport
;
682 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
683 const struct sctp_chunk
*chunk
)
685 struct sctp_chunk
*retval
;
687 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0);
689 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
691 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
692 * HEARTBEAT ACK, * etc.) to the same destination transport
693 * address from which it * received the DATA or control chunk
694 * to which it is replying.
696 * [ACK back to where the SHUTDOWN came from.]
699 retval
->transport
= chunk
->transport
;
704 struct sctp_chunk
*sctp_make_shutdown_complete(
705 const struct sctp_association
*asoc
,
706 const struct sctp_chunk
*chunk
)
708 struct sctp_chunk
*retval
;
711 /* Set the T-bit if we have no association (vtag will be
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
735 * association, except when responding to an INIT (sctpimpguide 2.41).
737 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
738 const struct sctp_chunk
*chunk
,
741 struct sctp_chunk
*retval
;
744 /* Set the T-bit if we have no association and 'chunk' is not
745 * an INIT (vtag will be reflected).
748 if (chunk
&& chunk
->chunk_hdr
&&
749 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
752 flags
= SCTP_CHUNK_FLAG_T
;
755 retval
= sctp_make_chunk(asoc
, SCTP_CID_ABORT
, flags
, hint
);
757 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
759 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
760 * HEARTBEAT ACK, * etc.) to the same destination transport
761 * address from which it * received the DATA or control chunk
762 * to which it is replying.
764 * [ABORT back to where the offender came from.]
767 retval
->transport
= chunk
->transport
;
772 /* Helper to create ABORT with a NO_USER_DATA error. */
773 struct sctp_chunk
*sctp_make_abort_no_data(
774 const struct sctp_association
*asoc
,
775 const struct sctp_chunk
*chunk
, __u32 tsn
)
777 struct sctp_chunk
*retval
;
780 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
786 /* Put the tsn back into network byte order. */
787 payload
= htonl(tsn
);
788 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, (const void *)&payload
,
791 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
793 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
794 * HEARTBEAT ACK, * etc.) to the same destination transport
795 * address from which it * received the DATA or control chunk
796 * to which it is replying.
798 * [ABORT back to where the offender came from.]
801 retval
->transport
= chunk
->transport
;
807 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
808 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
809 const struct msghdr
*msg
,
812 struct sctp_chunk
*retval
;
813 void *payload
= NULL
;
816 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
821 /* Put the msg_iov together into payload. */
822 payload
= kmalloc(paylen
, GFP_KERNEL
);
826 err
= memcpy_fromiovec(payload
, msg
->msg_iov
, paylen
);
831 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, payload
, paylen
);
841 sctp_chunk_free(retval
);
847 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
848 struct sctp_chunk
*sctp_make_abort_violation(
849 const struct sctp_association
*asoc
,
850 const struct sctp_chunk
*chunk
,
854 struct sctp_chunk
*retval
;
855 struct sctp_paramhdr phdr
;
857 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
858 + sizeof(sctp_chunkhdr_t
));
862 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, payload
, paylen
);
864 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
865 phdr
.length
= chunk
->chunk_hdr
->length
;
866 sctp_addto_chunk(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
872 /* Make a HEARTBEAT chunk. */
873 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
874 const struct sctp_transport
*transport
,
875 const void *payload
, const size_t paylen
)
877 struct sctp_chunk
*retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT
,
883 /* Cast away the 'const', as this is just telling the chunk
884 * what transport it belongs to.
886 retval
->transport
= (struct sctp_transport
*) transport
;
887 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
893 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
894 const struct sctp_chunk
*chunk
,
895 const void *payload
, const size_t paylen
)
897 struct sctp_chunk
*retval
;
899 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
);
903 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
905 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
907 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
908 * HEARTBEAT ACK, * etc.) to the same destination transport
909 * address from which it * received the DATA or control chunk
910 * to which it is replying.
912 * [HBACK back to where the HEARTBEAT came from.]
915 retval
->transport
= chunk
->transport
;
921 /* Create an Operation Error chunk with the specified space reserved.
922 * This routine can be used for containing multiple causes in the chunk.
924 static struct sctp_chunk
*sctp_make_op_error_space(
925 const struct sctp_association
*asoc
,
926 const struct sctp_chunk
*chunk
,
929 struct sctp_chunk
*retval
;
931 retval
= sctp_make_chunk(asoc
, SCTP_CID_ERROR
, 0,
932 sizeof(sctp_errhdr_t
) + size
);
936 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
938 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
939 * HEARTBEAT ACK, etc.) to the same destination transport
940 * address from which it received the DATA or control chunk
941 * to which it is replying.
945 retval
->transport
= chunk
->transport
;
951 /* Create an Operation Error chunk. */
952 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
953 const struct sctp_chunk
*chunk
,
954 __be16 cause_code
, const void *payload
,
957 struct sctp_chunk
*retval
;
959 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
);
963 sctp_init_cause(retval
, cause_code
, payload
, paylen
);
969 /********************************************************************
970 * 2nd Level Abstractions
971 ********************************************************************/
973 /* Turn an skb into a chunk.
974 * FIXME: Eventually move the structure directly inside the skb->cb[].
976 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
977 const struct sctp_association
*asoc
,
980 struct sctp_chunk
*retval
;
982 retval
= kmem_cache_alloc(sctp_chunk_cachep
, SLAB_ATOMIC
);
986 memset(retval
, 0, sizeof(struct sctp_chunk
));
989 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb
);
992 INIT_LIST_HEAD(&retval
->list
);
994 retval
->asoc
= (struct sctp_association
*)asoc
;
998 retval
->rtt_in_progress
= 0;
1000 retval
->singleton
= 1;
1001 retval
->end_of_packet
= 0;
1002 retval
->ecn_ce_done
= 0;
1003 retval
->pdiscard
= 0;
1005 /* sctpimpguide-05.txt Section 2.8.2
1006 * M1) Each time a new DATA chunk is transmitted
1007 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1008 * 'TSN.Missing.Report' count will be used to determine missing chunks
1009 * and when to fast retransmit.
1011 retval
->tsn_missing_report
= 0;
1012 retval
->tsn_gap_acked
= 0;
1013 retval
->fast_retransmit
= 0;
1015 /* If this is a fragmented message, track all fragments
1016 * of the message (for SEND_FAILED).
1020 /* Polish the bead hole. */
1021 INIT_LIST_HEAD(&retval
->transmitted_list
);
1022 INIT_LIST_HEAD(&retval
->frag_list
);
1023 SCTP_DBG_OBJCNT_INC(chunk
);
1024 atomic_set(&retval
->refcnt
, 1);
1030 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1031 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1032 union sctp_addr
*dest
)
1034 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1035 flip_to_h(&chunk
->source_h
, &chunk
->source
);
1036 flip_to_h(&chunk
->dest
, dest
);
1039 /* Extract the source address from a chunk. */
1040 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1042 /* If we have a known transport, use that. */
1043 if (chunk
->transport
) {
1044 return &chunk
->transport
->ipaddr_h
;
1046 /* Otherwise, extract it from the IP header. */
1047 return &chunk
->source_h
;
1051 /* Create a new chunk, setting the type and flags headers from the
1052 * arguments, reserving enough space for a 'paylen' byte payload.
1055 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
1056 __u8 type
, __u8 flags
, int paylen
)
1058 struct sctp_chunk
*retval
;
1059 sctp_chunkhdr_t
*chunk_hdr
;
1060 struct sk_buff
*skb
;
1063 /* No need to allocate LL here, as this is only a chunk. */
1064 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
),
1069 /* Make room for the chunk header. */
1070 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1071 chunk_hdr
->type
= type
;
1072 chunk_hdr
->flags
= flags
;
1073 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1075 sk
= asoc
? asoc
->base
.sk
: NULL
;
1076 retval
= sctp_chunkify(skb
, asoc
, sk
);
1082 retval
->chunk_hdr
= chunk_hdr
;
1083 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1085 /* Set the skb to the belonging sock for accounting. */
1094 /* Release the memory occupied by a chunk. */
1095 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1097 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1098 dev_kfree_skb(chunk
->skb
);
1100 SCTP_DBG_OBJCNT_DEC(chunk
);
1101 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1104 /* Possibly, free the chunk. */
1105 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1107 BUG_ON(!list_empty(&chunk
->list
));
1108 list_del_init(&chunk
->transmitted_list
);
1110 /* Release our reference on the message tracker. */
1112 sctp_datamsg_put(chunk
->msg
);
1114 sctp_chunk_put(chunk
);
1117 /* Grab a reference to the chunk. */
1118 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1120 atomic_inc(&ch
->refcnt
);
1123 /* Release a reference to the chunk. */
1124 void sctp_chunk_put(struct sctp_chunk
*ch
)
1126 if (atomic_dec_and_test(&ch
->refcnt
))
1127 sctp_chunk_destroy(ch
);
1130 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1133 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1137 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1138 int padlen
= chunklen
% 4;
1140 padding
= skb_put(chunk
->skb
, padlen
);
1141 target
= skb_put(chunk
->skb
, len
);
1143 memset(padding
, 0, padlen
);
1144 memcpy(target
, data
, len
);
1146 /* Adjust the chunk length field. */
1147 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1148 chunk
->chunk_end
= chunk
->skb
->tail
;
1153 /* Append bytes from user space to the end of a chunk. Will panic if
1154 * chunk is not big enough.
1155 * Returns a kernel err value.
1157 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int off
, int len
,
1163 /* Make room in chunk for data. */
1164 target
= skb_put(chunk
->skb
, len
);
1166 /* Copy data (whole iovec) into chunk */
1167 if ((err
= memcpy_fromiovecend(target
, data
, off
, len
)))
1170 /* Adjust the chunk length field. */
1171 chunk
->chunk_hdr
->length
=
1172 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1173 chunk
->chunk_end
= chunk
->skb
->tail
;
1179 /* Helper function to assign a TSN if needed. This assumes that both
1180 * the data_hdr and association have already been assigned.
1182 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1190 /* This is the last possible instant to assign a SSN. */
1191 if (chunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1194 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1195 if (chunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1196 ssn
= sctp_ssn_next(&chunk
->asoc
->ssnmap
->out
, sid
);
1198 ssn
= sctp_ssn_peek(&chunk
->asoc
->ssnmap
->out
, sid
);
1202 chunk
->subh
.data_hdr
->ssn
= ssn
;
1206 /* Helper function to assign a TSN if needed. This assumes that both
1207 * the data_hdr and association have already been assigned.
1209 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1211 if (!chunk
->has_tsn
) {
1212 /* This is the last possible instant to
1215 chunk
->subh
.data_hdr
->tsn
=
1216 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1221 /* Create a CLOSED association to use with an incoming packet. */
1222 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1223 struct sctp_chunk
*chunk
,
1226 struct sctp_association
*asoc
;
1227 struct sk_buff
*skb
;
1231 /* Create the bare association. */
1232 scope
= sctp_scope(sctp_source(chunk
));
1233 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1238 /* Create an entry for the source address of the packet. */
1239 af
= sctp_get_af_specific(ipver2af(skb
->nh
.iph
->version
));
1242 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1247 sctp_association_free(asoc
);
1251 /* Build a cookie representing asoc.
1252 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1254 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1255 const struct sctp_association
*asoc
,
1256 const struct sctp_chunk
*init_chunk
,
1258 const __u8
*raw_addrs
, int addrs_len
)
1260 sctp_cookie_param_t
*retval
;
1261 struct sctp_signed_cookie
*cookie
;
1262 struct scatterlist sg
;
1263 int headersize
, bodysize
;
1264 unsigned int keylen
;
1267 /* Header size is static data prior to the actual cookie, including
1270 headersize
= sizeof(sctp_paramhdr_t
) +
1271 (sizeof(struct sctp_signed_cookie
) -
1272 sizeof(struct sctp_cookie
));
1273 bodysize
= sizeof(struct sctp_cookie
)
1274 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1276 /* Pad out the cookie to a multiple to make the signature
1277 * functions simpler to write.
1279 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1280 bodysize
+= SCTP_COOKIE_MULTIPLE
1281 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1282 *cookie_len
= headersize
+ bodysize
;
1284 retval
= kmalloc(*cookie_len
, GFP_ATOMIC
);
1289 /* Clear this memory since we are sending this data structure
1290 * out on the network.
1292 memset(retval
, 0x00, *cookie_len
);
1293 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1295 /* Set up the parameter header. */
1296 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1297 retval
->p
.length
= htons(*cookie_len
);
1299 /* Copy the cookie part of the association itself. */
1300 cookie
->c
= asoc
->c
;
1301 /* Save the raw address list length in the cookie. */
1302 cookie
->c
.raw_addr_list_len
= addrs_len
;
1304 /* Remember PR-SCTP capability. */
1305 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1307 /* Save adaption indication in the cookie. */
1308 cookie
->c
.adaption_ind
= asoc
->peer
.adaption_ind
;
1310 /* Set an expiration time for the cookie. */
1311 do_gettimeofday(&cookie
->c
.expiration
);
1312 TIMEVAL_ADD(asoc
->cookie_life
, cookie
->c
.expiration
);
1314 /* Copy the peer's init packet. */
1315 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1316 ntohs(init_chunk
->chunk_hdr
->length
));
1318 /* Copy the raw local address list of the association. */
1319 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1320 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1322 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1323 struct hash_desc desc
;
1325 /* Sign the message. */
1326 sg
.page
= virt_to_page(&cookie
->c
);
1327 sg
.offset
= (unsigned long)(&cookie
->c
) % PAGE_SIZE
;
1328 sg
.length
= bodysize
;
1329 keylen
= SCTP_SECRET_SIZE
;
1330 key
= (char *)ep
->secret_key
[ep
->current_key
];
1331 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1334 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1335 crypto_hash_digest(&desc
, &sg
, bodysize
, cookie
->signature
))
1348 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1349 struct sctp_association
*sctp_unpack_cookie(
1350 const struct sctp_endpoint
*ep
,
1351 const struct sctp_association
*asoc
,
1352 struct sctp_chunk
*chunk
, gfp_t gfp
,
1353 int *error
, struct sctp_chunk
**errp
)
1355 struct sctp_association
*retval
= NULL
;
1356 struct sctp_signed_cookie
*cookie
;
1357 struct sctp_cookie
*bear_cookie
;
1358 int headersize
, bodysize
, fixed_size
;
1359 __u8
*digest
= ep
->digest
;
1360 struct scatterlist sg
;
1361 unsigned int keylen
, len
;
1364 struct sk_buff
*skb
= chunk
->skb
;
1366 struct hash_desc desc
;
1368 /* Header size is static data prior to the actual cookie, including
1371 headersize
= sizeof(sctp_chunkhdr_t
) +
1372 (sizeof(struct sctp_signed_cookie
) -
1373 sizeof(struct sctp_cookie
));
1374 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1375 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1377 /* Verify that the chunk looks like it even has a cookie.
1378 * There must be enough room for our cookie and our peer's
1381 len
= ntohs(chunk
->chunk_hdr
->length
);
1382 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1385 /* Verify that the cookie has been padded out. */
1386 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1389 /* Process the cookie. */
1390 cookie
= chunk
->subh
.cookie_hdr
;
1391 bear_cookie
= &cookie
->c
;
1393 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1396 /* Check the signature. */
1397 keylen
= SCTP_SECRET_SIZE
;
1398 sg
.page
= virt_to_page(bear_cookie
);
1399 sg
.offset
= (unsigned long)(bear_cookie
) % PAGE_SIZE
;
1400 sg
.length
= bodysize
;
1401 key
= (char *)ep
->secret_key
[ep
->current_key
];
1402 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
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 /* Try the previous key. */
1414 key
= (char *)ep
->secret_key
[ep
->last_key
];
1415 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1416 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1417 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1418 *error
= -SCTP_IERROR_NOMEM
;
1422 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1423 /* Yikes! Still bad signature! */
1424 *error
= -SCTP_IERROR_BAD_SIG
;
1430 /* IG Section 2.35.2:
1431 * 3) Compare the port numbers and the verification tag contained
1432 * within the COOKIE ECHO chunk to the actual port numbers and the
1433 * verification tag within the SCTP common header of the received
1434 * packet. If these values do not match the packet MUST be silently
1437 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1438 *error
= -SCTP_IERROR_BAD_TAG
;
1442 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1443 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1444 *error
= -SCTP_IERROR_BAD_PORTS
;
1448 /* Check to see if the cookie is stale. If there is already
1449 * an association, there is no need to check cookie's expiration
1450 * for init collision case of lost COOKIE ACK.
1451 * If skb has been timestamped, then use the stamp, otherwise
1452 * use current time. This introduces a small possibility that
1453 * that a cookie may be considered expired, but his would only slow
1454 * down the new association establishment instead of every packet.
1456 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1457 skb_get_timestamp(skb
, &tv
);
1459 do_gettimeofday(&tv
);
1461 if (!asoc
&& tv_lt(bear_cookie
->expiration
, tv
)) {
1464 * Section 3.3.10.3 Stale Cookie Error (3)
1468 * Stale Cookie Error: Indicates the receipt of a valid State
1469 * Cookie that has expired.
1471 len
= ntohs(chunk
->chunk_hdr
->length
);
1472 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1474 suseconds_t usecs
= (tv
.tv_sec
-
1475 bear_cookie
->expiration
.tv_sec
) * 1000000L +
1476 tv
.tv_usec
- bear_cookie
->expiration
.tv_usec
;
1478 usecs
= htonl(usecs
);
1479 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1480 &usecs
, sizeof(usecs
));
1481 *error
= -SCTP_IERROR_STALE_COOKIE
;
1483 *error
= -SCTP_IERROR_NOMEM
;
1488 /* Make a new base association. */
1489 scope
= sctp_scope(sctp_source(chunk
));
1490 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1492 *error
= -SCTP_IERROR_NOMEM
;
1496 /* Set up our peer's port number. */
1497 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1499 /* Populate the association from the cookie. */
1500 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1502 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1504 *error
= -SCTP_IERROR_NOMEM
;
1508 /* Also, add the destination address. */
1509 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1510 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
, 1,
1514 retval
->next_tsn
= retval
->c
.initial_tsn
;
1515 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1516 retval
->addip_serial
= retval
->c
.initial_tsn
;
1517 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1518 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1519 retval
->peer
.adaption_ind
= retval
->c
.adaption_ind
;
1521 /* The INIT stuff will be done by the side effects. */
1526 sctp_association_free(retval
);
1531 /* Yikes! The packet is either corrupt or deliberately
1534 *error
= -SCTP_IERROR_MALFORMED
;
1538 /********************************************************************
1539 * 3rd Level Abstractions
1540 ********************************************************************/
1542 struct __sctp_missing
{
1545 } __attribute__((packed
));
1548 * Report a missing mandatory parameter.
1550 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1551 sctp_param_t paramtype
,
1552 struct sctp_chunk
*chunk
,
1553 struct sctp_chunk
**errp
)
1555 struct __sctp_missing report
;
1558 len
= WORD_ROUND(sizeof(report
));
1560 /* Make an ERROR chunk, preparing enough room for
1561 * returning multiple unknown parameters.
1564 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1567 report
.num_missing
= htonl(1);
1568 report
.type
= paramtype
;
1569 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
,
1570 &report
, sizeof(report
));
1573 /* Stop processing this chunk. */
1577 /* Report an Invalid Mandatory Parameter. */
1578 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1579 struct sctp_chunk
*chunk
,
1580 struct sctp_chunk
**errp
)
1582 /* Invalid Mandatory Parameter Error has no payload. */
1585 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1588 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, NULL
, 0);
1590 /* Stop processing this chunk. */
1594 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1595 struct sctp_paramhdr
*param
,
1596 const struct sctp_chunk
*chunk
,
1597 struct sctp_chunk
**errp
)
1599 char error
[] = "The following parameter had invalid length:";
1600 size_t payload_len
= WORD_ROUND(sizeof(error
)) +
1601 sizeof(sctp_paramhdr_t
);
1604 /* Create an error chunk and fill it in with our payload. */
1606 *errp
= sctp_make_op_error_space(asoc
, chunk
, payload_len
);
1609 sctp_init_cause(*errp
, SCTP_ERROR_PROTO_VIOLATION
, error
,
1611 sctp_addto_chunk(*errp
, sizeof(sctp_paramhdr_t
), param
);
1618 /* Do not attempt to handle the HOST_NAME parm. However, do
1619 * send back an indicator to the peer.
1621 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1622 union sctp_params param
,
1623 struct sctp_chunk
*chunk
,
1624 struct sctp_chunk
**errp
)
1626 __u16 len
= ntohs(param
.p
->length
);
1628 /* Make an ERROR chunk. */
1630 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1633 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
,
1636 /* Stop processing this chunk. */
1640 /* RFC 3.2.1 & the Implementers Guide 2.2.
1642 * The Parameter Types are encoded such that the
1643 * highest-order two bits specify the action that must be
1644 * taken if the processing endpoint does not recognize the
1647 * 00 - Stop processing this SCTP chunk and discard it,
1648 * do not process any further chunks within it.
1650 * 01 - Stop processing this SCTP chunk and discard it,
1651 * do not process any further chunks within it, and report
1652 * the unrecognized parameter in an 'Unrecognized
1653 * Parameter Type' (in either an ERROR or in the INIT ACK).
1655 * 10 - Skip this parameter and continue processing.
1657 * 11 - Skip this parameter and continue processing but
1658 * report the unrecognized parameter in an
1659 * 'Unrecognized Parameter Type' (in either an ERROR or in
1663 * 0 - discard the chunk
1664 * 1 - continue with the chunk
1666 static int sctp_process_unk_param(const struct sctp_association
*asoc
,
1667 union sctp_params param
,
1668 struct sctp_chunk
*chunk
,
1669 struct sctp_chunk
**errp
)
1673 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
1674 case SCTP_PARAM_ACTION_DISCARD
:
1677 case SCTP_PARAM_ACTION_DISCARD_ERR
:
1679 /* Make an ERROR chunk, preparing enough room for
1680 * returning multiple unknown parameters.
1683 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1684 ntohs(chunk
->chunk_hdr
->length
));
1687 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1689 WORD_ROUND(ntohs(param
.p
->length
)));
1692 case SCTP_PARAM_ACTION_SKIP
:
1694 case SCTP_PARAM_ACTION_SKIP_ERR
:
1695 /* Make an ERROR chunk, preparing enough room for
1696 * returning multiple unknown parameters.
1699 *errp
= sctp_make_op_error_space(asoc
, chunk
,
1700 ntohs(chunk
->chunk_hdr
->length
));
1703 sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
1705 WORD_ROUND(ntohs(param
.p
->length
)));
1707 /* If there is no memory for generating the ERROR
1708 * report as specified, an ABORT will be triggered
1709 * to the peer and the association won't be
1723 /* Find unrecognized parameters in the chunk.
1725 * 0 - discard the chunk
1726 * 1 - continue with the chunk
1728 static int sctp_verify_param(const struct sctp_association
*asoc
,
1729 union sctp_params param
,
1731 struct sctp_chunk
*chunk
,
1732 struct sctp_chunk
**err_chunk
)
1736 /* FIXME - This routine is not looking at each parameter per the
1737 * chunk type, i.e., unrecognized parameters should be further
1738 * identified based on the chunk id.
1741 switch (param
.p
->type
) {
1742 case SCTP_PARAM_IPV4_ADDRESS
:
1743 case SCTP_PARAM_IPV6_ADDRESS
:
1744 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
1745 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
1746 case SCTP_PARAM_STATE_COOKIE
:
1747 case SCTP_PARAM_HEARTBEAT_INFO
:
1748 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
1749 case SCTP_PARAM_ECN_CAPABLE
:
1750 case SCTP_PARAM_ADAPTION_LAYER_IND
:
1753 case SCTP_PARAM_HOST_NAME_ADDRESS
:
1754 /* Tell the peer, we won't support this param. */
1755 return sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
1756 case SCTP_PARAM_FWD_TSN_SUPPORT
:
1757 if (sctp_prsctp_enable
)
1761 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
1762 ntohs(param
.p
->type
), cid
);
1763 return sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
1770 /* Verify the INIT packet before we process it. */
1771 int sctp_verify_init(const struct sctp_association
*asoc
,
1773 sctp_init_chunk_t
*peer_init
,
1774 struct sctp_chunk
*chunk
,
1775 struct sctp_chunk
**errp
)
1777 union sctp_params param
;
1780 /* Verify stream values are non-zero. */
1781 if ((0 == peer_init
->init_hdr
.num_outbound_streams
) ||
1782 (0 == peer_init
->init_hdr
.num_inbound_streams
)) {
1784 sctp_process_inv_mandatory(asoc
, chunk
, errp
);
1788 /* Check for missing mandatory parameters. */
1789 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1791 if (SCTP_PARAM_STATE_COOKIE
== param
.p
->type
)
1794 } /* for (loop through all parameters) */
1796 /* There is a possibility that a parameter length was bad and
1797 * in that case we would have stoped walking the parameters.
1798 * The current param.p would point at the bad one.
1799 * Current consensus on the mailing list is to generate a PROTOCOL
1800 * VIOLATION error. We build the ERROR chunk here and let the normal
1801 * error handling code build and send the packet.
1803 if (param
.v
< (void*)chunk
->chunk_end
- sizeof(sctp_paramhdr_t
)) {
1804 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
1808 /* The only missing mandatory param possible today is
1809 * the state cookie for an INIT-ACK chunk.
1811 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
) {
1812 sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
1817 /* Find unrecognized parameters. */
1819 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1821 if (!sctp_verify_param(asoc
, param
, cid
, chunk
, errp
)) {
1822 if (SCTP_PARAM_HOST_NAME_ADDRESS
== param
.p
->type
)
1828 } /* for (loop through all parameters) */
1833 /* Unpack the parameters in an INIT packet into an association.
1834 * Returns 0 on failure, else success.
1835 * FIXME: This is an association method.
1837 int sctp_process_init(struct sctp_association
*asoc
, sctp_cid_t cid
,
1838 const union sctp_addr
*peer_addr
,
1839 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
1841 union sctp_params param
;
1842 struct sctp_transport
*transport
;
1843 struct list_head
*pos
, *temp
;
1846 /* We must include the address that the INIT packet came from.
1847 * This is the only address that matters for an INIT packet.
1848 * When processing a COOKIE ECHO, we retrieve the from address
1849 * of the INIT from the cookie.
1852 /* This implementation defaults to making the first transport
1853 * added as the primary transport. The source address seems to
1854 * be a a better choice than any of the embedded addresses.
1857 if(!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
1860 /* Process the initialization parameters. */
1862 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
1864 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
1868 /* Walk list of transports, removing transports in the UNKNOWN state. */
1869 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
1870 transport
= list_entry(pos
, struct sctp_transport
, transports
);
1871 if (transport
->state
== SCTP_UNKNOWN
) {
1872 sctp_assoc_rm_peer(asoc
, transport
);
1876 /* The fixed INIT headers are always in network byte
1879 asoc
->peer
.i
.init_tag
=
1880 ntohl(peer_init
->init_hdr
.init_tag
);
1881 asoc
->peer
.i
.a_rwnd
=
1882 ntohl(peer_init
->init_hdr
.a_rwnd
);
1883 asoc
->peer
.i
.num_outbound_streams
=
1884 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
1885 asoc
->peer
.i
.num_inbound_streams
=
1886 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
1887 asoc
->peer
.i
.initial_tsn
=
1888 ntohl(peer_init
->init_hdr
.initial_tsn
);
1890 /* Apply the upper bounds for output streams based on peer's
1891 * number of inbound streams.
1893 if (asoc
->c
.sinit_num_ostreams
>
1894 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
1895 asoc
->c
.sinit_num_ostreams
=
1896 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
1899 if (asoc
->c
.sinit_max_instreams
>
1900 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
1901 asoc
->c
.sinit_max_instreams
=
1902 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
1905 /* Copy Initiation tag from INIT to VT_peer in cookie. */
1906 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
1908 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
1909 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
1911 /* Copy cookie in case we need to resend COOKIE-ECHO. */
1912 cookie
= asoc
->peer
.cookie
;
1914 asoc
->peer
.cookie
= kmalloc(asoc
->peer
.cookie_len
, gfp
);
1915 if (!asoc
->peer
.cookie
)
1917 memcpy(asoc
->peer
.cookie
, cookie
, asoc
->peer
.cookie_len
);
1920 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
1921 * high (for example, implementations MAY use the size of the receiver
1922 * advertised window).
1924 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
1925 transport
= list_entry(pos
, struct sctp_transport
, transports
);
1926 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
1929 /* Set up the TSN tracking pieces. */
1930 sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_SIZE
,
1931 asoc
->peer
.i
.initial_tsn
);
1933 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
1935 * The stream sequence number in all the streams shall start
1936 * from 0 when the association is established. Also, when the
1937 * stream sequence number reaches the value 65535 the next
1938 * stream sequence number shall be set to 0.
1941 /* Allocate storage for the negotiated streams if it is not a temporary
1948 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
1949 asoc
->c
.sinit_num_ostreams
, gfp
);
1954 if (unlikely(!idr_pre_get(&sctp_assocs_id
, gfp
)))
1956 spin_lock_bh(&sctp_assocs_id_lock
);
1957 error
= idr_get_new_above(&sctp_assocs_id
, (void *)asoc
, 1,
1959 spin_unlock_bh(&sctp_assocs_id_lock
);
1960 if (error
== -EAGAIN
)
1965 asoc
->assoc_id
= (sctp_assoc_t
) assoc_id
;
1968 /* ADDIP Section 4.1 ASCONF Chunk Procedures
1970 * When an endpoint has an ASCONF signaled change to be sent to the
1971 * remote endpoint it should do the following:
1973 * A2) A serial number should be assigned to the Chunk. The serial
1974 * number should be a monotonically increasing number. All serial
1975 * numbers are defined to be initialized at the start of the
1976 * association to the same value as the Initial TSN.
1978 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
1982 /* Release the transport structures. */
1983 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
1984 transport
= list_entry(pos
, struct sctp_transport
, transports
);
1986 sctp_transport_free(transport
);
1989 asoc
->peer
.transport_count
= 0;
1996 /* Update asoc with the option described in param.
1998 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2000 * asoc is the association to update.
2001 * param is the variable length parameter to use for update.
2002 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2003 * If the current packet is an INIT we want to minimize the amount of
2004 * work we do. In particular, we should not build transport
2005 * structures for the addresses.
2007 static int sctp_process_param(struct sctp_association
*asoc
,
2008 union sctp_params param
,
2009 const union sctp_addr
*peer_addr
,
2012 union sctp_addr addr
;
2020 /* We maintain all INIT parameters in network byte order all the
2021 * time. This allows us to not worry about whether the parameters
2022 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2024 switch (param
.p
->type
) {
2025 case SCTP_PARAM_IPV6_ADDRESS
:
2026 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2029 case SCTP_PARAM_IPV4_ADDRESS
:
2030 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2031 af
->from_addr_param(&addr
, param
.addr
, asoc
->peer
.port
, 0);
2032 scope
= sctp_scope(peer_addr
);
2033 if (sctp_in_scope(&addr
, scope
))
2034 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2038 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2039 if (!sctp_cookie_preserve_enable
)
2042 stale
= ntohl(param
.life
->lifespan_increment
);
2044 /* Suggested Cookie Life span increment's unit is msec,
2047 asoc
->cookie_life
.tv_sec
+= stale
/ 1000;
2048 asoc
->cookie_life
.tv_usec
+= (stale
% 1000) * 1000;
2051 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2052 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2055 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2056 /* Turn off the default values first so we'll know which
2057 * ones are really set by the peer.
2059 asoc
->peer
.ipv4_address
= 0;
2060 asoc
->peer
.ipv6_address
= 0;
2062 /* Cycle through address types; avoid divide by 0. */
2063 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2065 sat
/= sizeof(__u16
);
2067 for (i
= 0; i
< sat
; ++i
) {
2068 switch (param
.sat
->types
[i
]) {
2069 case SCTP_PARAM_IPV4_ADDRESS
:
2070 asoc
->peer
.ipv4_address
= 1;
2073 case SCTP_PARAM_IPV6_ADDRESS
:
2074 asoc
->peer
.ipv6_address
= 1;
2077 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2078 asoc
->peer
.hostname_address
= 1;
2081 default: /* Just ignore anything else. */
2087 case SCTP_PARAM_STATE_COOKIE
:
2088 asoc
->peer
.cookie_len
=
2089 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2090 asoc
->peer
.cookie
= param
.cookie
->body
;
2093 case SCTP_PARAM_HEARTBEAT_INFO
:
2094 /* Would be odd to receive, but it causes no problems. */
2097 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2098 /* Rejected during verify stage. */
2101 case SCTP_PARAM_ECN_CAPABLE
:
2102 asoc
->peer
.ecn_capable
= 1;
2105 case SCTP_PARAM_ADAPTION_LAYER_IND
:
2106 asoc
->peer
.adaption_ind
= param
.aind
->adaption_ind
;
2109 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2110 if (sctp_prsctp_enable
) {
2111 asoc
->peer
.prsctp_capable
= 1;
2116 /* Any unrecognized parameters should have been caught
2117 * and handled by sctp_verify_param() which should be
2118 * called prior to this routine. Simply log the error
2121 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2122 ntohs(param
.p
->type
), asoc
);
2129 /* Select a new verification tag. */
2130 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2132 /* I believe that this random number generator complies with RFC1750.
2133 * A tag of 0 is reserved for special cases (e.g. INIT).
2138 get_random_bytes(&x
, sizeof(__u32
));
2144 /* Select an initial TSN to send during startup. */
2145 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2149 get_random_bytes(&retval
, sizeof(__u32
));
2154 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2156 * 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
2157 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2158 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2159 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2161 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2162 * | Address Parameter |
2163 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2164 * | ASCONF Parameter #1 |
2165 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2169 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2170 * | ASCONF Parameter #N |
2171 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2173 * Address Parameter and other parameter will not be wrapped in this function
2175 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2176 union sctp_addr
*addr
,
2179 sctp_addiphdr_t asconf
;
2180 struct sctp_chunk
*retval
;
2181 int length
= sizeof(asconf
) + vparam_len
;
2182 union sctp_addr_param addrparam
;
2184 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2186 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2191 /* Create the chunk. */
2192 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF
, 0, length
);
2196 asconf
.serial
= htonl(asoc
->addip_serial
++);
2198 retval
->subh
.addip_hdr
=
2199 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2200 retval
->param_hdr
.v
=
2201 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2207 * 3.2.1 Add IP Address
2209 * 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
2210 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2211 * | Type = 0xC001 | Length = Variable |
2212 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2213 * | ASCONF-Request Correlation ID |
2214 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2215 * | Address Parameter |
2216 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2218 * 3.2.2 Delete IP Address
2220 * 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
2221 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2222 * | Type = 0xC002 | Length = Variable |
2223 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2224 * | ASCONF-Request Correlation ID |
2225 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2226 * | Address Parameter |
2227 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2230 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2231 union sctp_addr
*laddr
,
2232 struct sockaddr
*addrs
,
2236 sctp_addip_param_t param
;
2237 struct sctp_chunk
*retval
;
2238 union sctp_addr_param addr_param
;
2239 union sctp_addr
*addr
;
2242 int paramlen
= sizeof(param
);
2243 int addr_param_len
= 0;
2247 /* Get total length of all the address parameters. */
2249 for (i
= 0; i
< addrcnt
; i
++) {
2250 addr
= (union sctp_addr
*)addr_buf
;
2251 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2252 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2254 totallen
+= paramlen
;
2255 totallen
+= addr_param_len
;
2257 addr_buf
+= af
->sockaddr_len
;
2260 /* Create an asconf chunk with the required length. */
2261 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2265 /* Add the address parameters to the asconf chunk. */
2267 for (i
= 0; i
< addrcnt
; i
++) {
2268 addr
= (union sctp_addr
*)addr_buf
;
2269 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2270 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2271 param
.param_hdr
.type
= flags
;
2272 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2275 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2276 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2278 addr_buf
+= af
->sockaddr_len
;
2284 * 3.2.4 Set Primary IP Address
2286 * 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
2287 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2288 * | Type =0xC004 | Length = Variable |
2289 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2290 * | ASCONF-Request Correlation ID |
2291 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2292 * | Address Parameter |
2293 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2295 * Create an ASCONF chunk with Set Primary IP address parameter.
2297 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2298 union sctp_addr
*addr
)
2300 sctp_addip_param_t param
;
2301 struct sctp_chunk
*retval
;
2302 int len
= sizeof(param
);
2303 union sctp_addr_param addrparam
;
2305 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2307 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2312 /* Create the chunk and make asconf header. */
2313 retval
= sctp_make_asconf(asoc
, addr
, len
);
2317 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2318 param
.param_hdr
.length
= htons(len
);
2321 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2322 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2327 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2329 * 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
2330 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2331 * | Type = 0x80 | Chunk Flags | Chunk Length |
2332 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2334 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2335 * | ASCONF Parameter Response#1 |
2336 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2340 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2341 * | ASCONF Parameter Response#N |
2342 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2344 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2346 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2347 __u32 serial
, int vparam_len
)
2349 sctp_addiphdr_t asconf
;
2350 struct sctp_chunk
*retval
;
2351 int length
= sizeof(asconf
) + vparam_len
;
2353 /* Create the chunk. */
2354 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
);
2358 asconf
.serial
= htonl(serial
);
2360 retval
->subh
.addip_hdr
=
2361 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2366 /* Add response parameters to an ASCONF_ACK chunk. */
2367 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __u32 crr_id
,
2368 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2370 sctp_addip_param_t ack_param
;
2371 sctp_errhdr_t err_param
;
2372 int asconf_param_len
= 0;
2373 int err_param_len
= 0;
2374 __be16 response_type
;
2376 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2377 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2379 response_type
= SCTP_PARAM_ERR_CAUSE
;
2380 err_param_len
= sizeof(err_param
);
2383 ntohs(asconf_param
->param_hdr
.length
);
2386 /* Add Success Indication or Error Cause Indication parameter. */
2387 ack_param
.param_hdr
.type
= response_type
;
2388 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2391 ack_param
.crr_id
= crr_id
;
2392 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2394 if (SCTP_ERROR_NO_ERROR
== err_code
)
2397 /* Add Error Cause parameter. */
2398 err_param
.cause
= err_code
;
2399 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2400 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2402 /* Add the failed TLV copied from ASCONF chunk. */
2404 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
2407 /* Process a asconf parameter. */
2408 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
2409 struct sctp_chunk
*asconf
,
2410 sctp_addip_param_t
*asconf_param
)
2412 struct sctp_transport
*peer
;
2414 union sctp_addr addr
;
2415 struct list_head
*pos
;
2416 union sctp_addr_param
*addr_param
;
2417 union sctp_addr tmp
, tmp_addr
;
2419 addr_param
= (union sctp_addr_param
*)
2420 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2422 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2424 return SCTP_ERROR_INV_PARAM
;
2426 af
->from_addr_param(&addr
, addr_param
, asoc
->peer
.port
, 0);
2427 flip_to_n(&tmp_addr
, &addr
);
2428 switch (asconf_param
->param_hdr
.type
) {
2429 case SCTP_PARAM_ADD_IP
:
2430 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
2431 * request and does not have the local resources to add this
2432 * new address to the association, it MUST return an Error
2433 * Cause TLV set to the new error code 'Operation Refused
2434 * Due to Resource Shortage'.
2437 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
2439 return SCTP_ERROR_RSRC_LOW
;
2441 /* Start the heartbeat timer. */
2442 if (!mod_timer(&peer
->hb_timer
, sctp_transport_timeout(peer
)))
2443 sctp_transport_hold(peer
);
2445 case SCTP_PARAM_DEL_IP
:
2446 /* ADDIP 4.3 D7) If a request is received to delete the
2447 * last remaining IP address of a peer endpoint, the receiver
2448 * MUST send an Error Cause TLV with the error cause set to the
2449 * new error code 'Request to Delete Last Remaining IP Address'.
2451 pos
= asoc
->peer
.transport_addr_list
.next
;
2452 if (pos
->next
== &asoc
->peer
.transport_addr_list
)
2453 return SCTP_ERROR_DEL_LAST_IP
;
2455 /* ADDIP 4.3 D8) If a request is received to delete an IP
2456 * address which is also the source address of the IP packet
2457 * which contained the ASCONF chunk, the receiver MUST reject
2458 * this request. To reject the request the receiver MUST send
2459 * an Error Cause TLV set to the new error code 'Request to
2460 * Delete Source IP Address'
2462 flip_to_n(&tmp
, sctp_source(asconf
));
2463 if (sctp_cmp_addr_exact(&tmp
, &tmp_addr
))
2464 return SCTP_ERROR_DEL_SRC_IP
;
2466 sctp_assoc_del_peer(asoc
, &tmp_addr
);
2468 case SCTP_PARAM_SET_PRIMARY
:
2469 peer
= sctp_assoc_lookup_paddr(asoc
, &tmp_addr
);
2471 return SCTP_ERROR_INV_PARAM
;
2473 sctp_assoc_set_primary(asoc
, peer
);
2476 return SCTP_ERROR_INV_PARAM
;
2480 return SCTP_ERROR_NO_ERROR
;
2483 /* Process an incoming ASCONF chunk with the next expected serial no. and
2484 * return an ASCONF_ACK chunk to be sent in response.
2486 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
2487 struct sctp_chunk
*asconf
)
2489 sctp_addiphdr_t
*hdr
;
2490 union sctp_addr_param
*addr_param
;
2491 sctp_addip_param_t
*asconf_param
;
2492 struct sctp_chunk
*asconf_ack
;
2496 int chunk_len
= asconf
->skb
->len
;
2498 int all_param_pass
= 1;
2500 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
2501 serial
= ntohl(hdr
->serial
);
2503 /* Skip the addiphdr and store a pointer to address parameter. */
2504 length
= sizeof(sctp_addiphdr_t
);
2505 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
2506 chunk_len
-= length
;
2508 /* Skip the address parameter and store a pointer to the first
2511 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
2512 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
2513 chunk_len
-= length
;
2515 /* create an ASCONF_ACK chunk.
2516 * Based on the definitions of parameters, we know that the size of
2517 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
2520 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 2);
2524 /* Process the TLVs contained within the ASCONF chunk. */
2525 while (chunk_len
> 0) {
2526 err_code
= sctp_process_asconf_param(asoc
, asconf
,
2529 * If an error response is received for a TLV parameter,
2530 * all TLVs with no response before the failed TLV are
2531 * considered successful if not reported. All TLVs after
2532 * the failed response are considered unsuccessful unless
2533 * a specific success indication is present for the parameter.
2535 if (SCTP_ERROR_NO_ERROR
!= err_code
)
2538 if (!all_param_pass
)
2539 sctp_add_asconf_response(asconf_ack
,
2540 asconf_param
->crr_id
, err_code
,
2543 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
2544 * an IP address sends an 'Out of Resource' in its response, it
2545 * MUST also fail any subsequent add or delete requests bundled
2548 if (SCTP_ERROR_RSRC_LOW
== err_code
)
2551 /* Move to the next ASCONF param. */
2552 length
= ntohs(asconf_param
->param_hdr
.length
);
2553 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
2555 chunk_len
-= length
;
2559 asoc
->peer
.addip_serial
++;
2561 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
2562 * after freeing the reference to old asconf ack if any.
2565 if (asoc
->addip_last_asconf_ack
)
2566 sctp_chunk_free(asoc
->addip_last_asconf_ack
);
2568 sctp_chunk_hold(asconf_ack
);
2569 asoc
->addip_last_asconf_ack
= asconf_ack
;
2575 /* Process a asconf parameter that is successfully acked. */
2576 static int sctp_asconf_param_success(struct sctp_association
*asoc
,
2577 sctp_addip_param_t
*asconf_param
)
2580 union sctp_addr addr
;
2581 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
2582 union sctp_addr_param
*addr_param
;
2583 struct list_head
*pos
;
2584 struct sctp_transport
*transport
;
2585 struct sctp_sockaddr_entry
*saddr
;
2587 union sctp_addr tmp
;
2589 addr_param
= (union sctp_addr_param
*)
2590 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2592 /* We have checked the packet before, so we do not check again. */
2593 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2594 af
->from_addr_param(&addr
, addr_param
, bp
->port
, 0);
2595 flip_to_n(&tmp
, &addr
);
2597 switch (asconf_param
->param_hdr
.type
) {
2598 case SCTP_PARAM_ADD_IP
:
2599 sctp_local_bh_disable();
2600 sctp_write_lock(&asoc
->base
.addr_lock
);
2601 list_for_each(pos
, &bp
->address_list
) {
2602 saddr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
2603 if (sctp_cmp_addr_exact(&saddr
->a
, &tmp
))
2604 saddr
->use_as_src
= 1;
2606 sctp_write_unlock(&asoc
->base
.addr_lock
);
2607 sctp_local_bh_enable();
2609 case SCTP_PARAM_DEL_IP
:
2610 sctp_local_bh_disable();
2611 sctp_write_lock(&asoc
->base
.addr_lock
);
2612 retval
= sctp_del_bind_addr(bp
, &tmp
);
2613 sctp_write_unlock(&asoc
->base
.addr_lock
);
2614 sctp_local_bh_enable();
2615 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
2616 transport
= list_entry(pos
, struct sctp_transport
,
2618 dst_release(transport
->dst
);
2619 sctp_transport_route(transport
, NULL
,
2620 sctp_sk(asoc
->base
.sk
));
2630 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
2631 * for the given asconf parameter. If there is no response for this parameter,
2632 * return the error code based on the third argument 'no_err'.
2634 * A7) If an error response is received for a TLV parameter, all TLVs with no
2635 * response before the failed TLV are considered successful if not reported.
2636 * All TLVs after the failed response are considered unsuccessful unless a
2637 * specific success indication is present for the parameter.
2639 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
2640 sctp_addip_param_t
*asconf_param
,
2643 sctp_addip_param_t
*asconf_ack_param
;
2644 sctp_errhdr_t
*err_param
;
2646 int asconf_ack_len
= asconf_ack
->skb
->len
;
2650 err_code
= SCTP_ERROR_NO_ERROR
;
2652 err_code
= SCTP_ERROR_REQ_REFUSED
;
2654 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
2655 * the first asconf_ack parameter.
2657 length
= sizeof(sctp_addiphdr_t
);
2658 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
2660 asconf_ack_len
-= length
;
2662 while (asconf_ack_len
> 0) {
2663 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
2664 switch(asconf_ack_param
->param_hdr
.type
) {
2665 case SCTP_PARAM_SUCCESS_REPORT
:
2666 return SCTP_ERROR_NO_ERROR
;
2667 case SCTP_PARAM_ERR_CAUSE
:
2668 length
= sizeof(sctp_addip_param_t
);
2669 err_param
= (sctp_errhdr_t
*)
2670 ((void *)asconf_ack_param
+ length
);
2671 asconf_ack_len
-= length
;
2672 if (asconf_ack_len
> 0)
2673 return err_param
->cause
;
2675 return SCTP_ERROR_INV_PARAM
;
2678 return SCTP_ERROR_INV_PARAM
;
2682 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
2683 asconf_ack_param
= (sctp_addip_param_t
*)
2684 ((void *)asconf_ack_param
+ length
);
2685 asconf_ack_len
-= length
;
2691 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
2692 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
2693 struct sctp_chunk
*asconf_ack
)
2695 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
2696 union sctp_addr_param
*addr_param
;
2697 sctp_addip_param_t
*asconf_param
;
2699 int asconf_len
= asconf
->skb
->len
;
2700 int all_param_pass
= 0;
2703 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
2705 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
2706 * a pointer to address parameter.
2708 length
= sizeof(sctp_addip_chunk_t
);
2709 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
2710 asconf_len
-= length
;
2712 /* Skip the address parameter in the last asconf sent and store a
2713 * pointer to the first asconf paramter.
2715 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
2716 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
2717 asconf_len
-= length
;
2720 * A8) If there is no response(s) to specific TLV parameter(s), and no
2721 * failures are indicated, then all request(s) are considered
2724 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
2727 /* Process the TLVs contained in the last sent ASCONF chunk. */
2728 while (asconf_len
> 0) {
2730 err_code
= SCTP_ERROR_NO_ERROR
;
2732 err_code
= sctp_get_asconf_response(asconf_ack
,
2735 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
2740 case SCTP_ERROR_NO_ERROR
:
2741 retval
= sctp_asconf_param_success(asoc
, asconf_param
);
2744 case SCTP_ERROR_RSRC_LOW
:
2748 case SCTP_ERROR_INV_PARAM
:
2749 /* Disable sending this type of asconf parameter in
2752 asoc
->peer
.addip_disabled_mask
|=
2753 asconf_param
->param_hdr
.type
;
2756 case SCTP_ERROR_REQ_REFUSED
:
2757 case SCTP_ERROR_DEL_LAST_IP
:
2758 case SCTP_ERROR_DEL_SRC_IP
:
2763 /* Skip the processed asconf parameter and move to the next
2766 length
= ntohs(asconf_param
->param_hdr
.length
);
2767 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
2769 asconf_len
-= length
;
2772 /* Free the cached last sent asconf chunk. */
2773 sctp_chunk_free(asconf
);
2774 asoc
->addip_last_asconf
= NULL
;
2776 /* Send the next asconf chunk from the addip chunk queue. */
2777 if (!list_empty(&asoc
->addip_chunk_list
)) {
2778 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
2779 asconf
= list_entry(entry
, struct sctp_chunk
, list
);
2781 list_del_init(entry
);
2783 /* Hold the chunk until an ASCONF_ACK is received. */
2784 sctp_chunk_hold(asconf
);
2785 if (sctp_primitive_ASCONF(asoc
, asconf
))
2786 sctp_chunk_free(asconf
);
2788 asoc
->addip_last_asconf
= asconf
;
2794 /* Make a FWD TSN chunk. */
2795 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
2796 __u32 new_cum_tsn
, size_t nstreams
,
2797 struct sctp_fwdtsn_skip
*skiplist
)
2799 struct sctp_chunk
*retval
= NULL
;
2800 struct sctp_fwdtsn_chunk
*ftsn_chunk
;
2801 struct sctp_fwdtsn_hdr ftsn_hdr
;
2802 struct sctp_fwdtsn_skip skip
;
2806 hint
= (nstreams
+ 1) * sizeof(__u32
);
2808 retval
= sctp_make_chunk(asoc
, SCTP_CID_FWD_TSN
, 0, hint
);
2813 ftsn_chunk
= (struct sctp_fwdtsn_chunk
*)retval
->subh
.fwdtsn_hdr
;
2815 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
2816 retval
->subh
.fwdtsn_hdr
=
2817 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
2819 for (i
= 0; i
< nstreams
; i
++) {
2820 skip
.stream
= skiplist
[i
].stream
;
2821 skip
.ssn
= skiplist
[i
].ssn
;
2822 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);