1 /* SCTP kernel 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 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 * This SCTP 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 * This SCTP 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 <linux/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
,
80 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
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(ip_hdr(chunk
->skb
)->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 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
105 static const struct sctp_paramhdr prsctp_param
= {
106 SCTP_PARAM_FWD_TSN_SUPPORT
,
107 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
110 /* A helper 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
,
120 /* Cause code constants are now defined in network order. */
121 err
.cause
= cause_code
;
122 len
= sizeof(sctp_errhdr_t
) + paylen
;
123 err
.length
= htons(len
);
124 chunk
->subh
.err_hdr
= sctp_addto_chunk(chunk
, sizeof(sctp_errhdr_t
), &err
);
127 /* A helper to initialize an op error inside a
128 * provided chunk, as most cause codes will be embedded inside an
129 * abort chunk. Differs from sctp_init_cause in that it won't oops
130 * if there isn't enough space in the op error chunk
132 int sctp_init_cause_fixed(struct sctp_chunk
*chunk
, __be16 cause_code
,
138 /* Cause code constants are now defined in network order. */
139 err
.cause
= cause_code
;
140 len
= sizeof(sctp_errhdr_t
) + paylen
;
141 err
.length
= htons(len
);
143 if (skb_tailroom(chunk
->skb
) < len
)
145 chunk
->subh
.err_hdr
= sctp_addto_chunk_fixed(chunk
,
146 sizeof(sctp_errhdr_t
),
150 /* 3.3.2 Initiation (INIT) (1)
152 * This chunk is used to initiate a SCTP association between two
153 * endpoints. The format of the INIT chunk is shown below:
156 * 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
157 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
158 * | Type = 1 | Chunk Flags | Chunk Length |
159 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
161 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
162 * | Advertised Receiver Window Credit (a_rwnd) |
163 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
164 * | Number of Outbound Streams | Number of Inbound Streams |
165 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
167 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
169 * / Optional/Variable-Length Parameters /
171 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
174 * The INIT chunk contains the following parameters. Unless otherwise
175 * noted, each parameter MUST only be included once in the INIT chunk.
177 * Fixed Parameters Status
178 * ----------------------------------------------
179 * Initiate Tag Mandatory
180 * Advertised Receiver Window Credit Mandatory
181 * Number of Outbound Streams Mandatory
182 * Number of Inbound Streams Mandatory
183 * Initial TSN Mandatory
185 * Variable Parameters Status Type Value
186 * -------------------------------------------------------------
187 * IPv4 Address (Note 1) Optional 5
188 * IPv6 Address (Note 1) Optional 6
189 * Cookie Preservative Optional 9
190 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
191 * Host Name Address (Note 3) Optional 11
192 * Supported Address Types (Note 4) Optional 12
194 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
195 const struct sctp_bind_addr
*bp
,
196 gfp_t gfp
, int vparam_len
)
199 union sctp_params addrs
;
201 struct sctp_chunk
*retval
= NULL
;
202 int num_types
, addrs_len
= 0;
203 struct sctp_sock
*sp
;
204 sctp_supported_addrs_param_t sat
;
206 sctp_adaptation_ind_param_t aiparam
;
207 sctp_supported_ext_param_t ext_param
;
210 sctp_paramhdr_t
*auth_chunks
= NULL
,
213 /* RFC 2960 3.3.2 Initiation (INIT) (1)
215 * Note 1: The INIT chunks can contain multiple addresses that
216 * can be IPv4 and/or IPv6 in any combination.
220 /* Convert the provided bind address list to raw format. */
221 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
223 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
224 init
.a_rwnd
= htonl(asoc
->rwnd
);
225 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
226 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
227 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
229 /* How many address types are needed? */
230 sp
= sctp_sk(asoc
->base
.sk
);
231 num_types
= sp
->pf
->supported_addrs(sp
, types
);
233 chunksize
= sizeof(init
) + addrs_len
;
234 chunksize
+= WORD_ROUND(SCTP_SAT_LEN(num_types
));
235 chunksize
+= sizeof(ecap_param
);
237 if (sctp_prsctp_enable
)
238 chunksize
+= sizeof(prsctp_param
);
240 /* ADDIP: Section 4.2.7:
241 * An implementation supporting this extension [ADDIP] MUST list
242 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
243 * INIT-ACK parameters.
245 if (sctp_addip_enable
) {
246 extensions
[num_ext
] = SCTP_CID_ASCONF
;
247 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
251 if (sp
->adaptation_ind
)
252 chunksize
+= sizeof(aiparam
);
254 chunksize
+= vparam_len
;
256 /* Account for AUTH related parameters */
257 if (sctp_auth_enable
) {
258 /* Add random parameter length*/
259 chunksize
+= sizeof(asoc
->c
.auth_random
);
261 /* Add HMACS parameter length if any were defined */
262 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
263 if (auth_hmacs
->length
)
264 chunksize
+= WORD_ROUND(ntohs(auth_hmacs
->length
));
268 /* Add CHUNKS parameter length */
269 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
270 if (auth_chunks
->length
)
271 chunksize
+= WORD_ROUND(ntohs(auth_chunks
->length
));
275 extensions
[num_ext
] = SCTP_CID_AUTH
;
279 /* If we have any extensions to report, account for that */
281 chunksize
+= WORD_ROUND(sizeof(sctp_supported_ext_param_t
) +
284 /* RFC 2960 3.3.2 Initiation (INIT) (1)
286 * Note 3: An INIT chunk MUST NOT contain more than one Host
287 * Name address parameter. Moreover, the sender of the INIT
288 * MUST NOT combine any other address types with the Host Name
289 * address in the INIT. The receiver of INIT MUST ignore any
290 * other address types if the Host Name address parameter is
291 * present in the received INIT chunk.
293 * PLEASE DO NOT FIXME [This version does not support Host Name.]
296 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT
, 0, chunksize
);
300 retval
->subh
.init_hdr
=
301 sctp_addto_chunk(retval
, sizeof(init
), &init
);
302 retval
->param_hdr
.v
=
303 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
305 /* RFC 2960 3.3.2 Initiation (INIT) (1)
307 * Note 4: This parameter, when present, specifies all the
308 * address types the sending endpoint can support. The absence
309 * of this parameter indicates that the sending endpoint can
310 * support any address type.
312 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
313 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
314 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
315 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
317 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
319 /* Add the supported extensions parameter. Be nice and add this
320 * fist before addiding the parameters for the extensions themselves
323 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
324 ext_param
.param_hdr
.length
=
325 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
326 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
328 sctp_addto_param(retval
, num_ext
, extensions
);
331 if (sctp_prsctp_enable
)
332 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
334 if (sp
->adaptation_ind
) {
335 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
336 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
337 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
338 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
341 /* Add SCTP-AUTH chunks to the parameter list */
342 if (sctp_auth_enable
) {
343 sctp_addto_chunk(retval
, sizeof(asoc
->c
.auth_random
),
344 asoc
->c
.auth_random
);
346 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
349 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
357 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
358 const struct sctp_chunk
*chunk
,
359 gfp_t gfp
, int unkparam_len
)
361 sctp_inithdr_t initack
;
362 struct sctp_chunk
*retval
;
363 union sctp_params addrs
;
364 struct sctp_sock
*sp
;
366 sctp_cookie_param_t
*cookie
;
369 sctp_adaptation_ind_param_t aiparam
;
370 sctp_supported_ext_param_t ext_param
;
373 sctp_paramhdr_t
*auth_chunks
= NULL
,
379 /* Note: there may be no addresses to embed. */
380 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
382 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
383 initack
.a_rwnd
= htonl(asoc
->rwnd
);
384 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
385 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
386 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
388 /* FIXME: We really ought to build the cookie right
389 * into the packet instead of allocating more fresh memory.
391 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
396 /* Calculate the total size of allocation, include the reserved
397 * space for reporting unknown parameters if it is specified.
399 sp
= sctp_sk(asoc
->base
.sk
);
400 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
402 /* Tell peer that we'll do ECN only if peer advertised such cap. */
403 if (asoc
->peer
.ecn_capable
)
404 chunksize
+= sizeof(ecap_param
);
406 if (asoc
->peer
.prsctp_capable
)
407 chunksize
+= sizeof(prsctp_param
);
409 if (asoc
->peer
.asconf_capable
) {
410 extensions
[num_ext
] = SCTP_CID_ASCONF
;
411 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
415 if (sp
->adaptation_ind
)
416 chunksize
+= sizeof(aiparam
);
418 if (asoc
->peer
.auth_capable
) {
419 auth_random
= (sctp_paramhdr_t
*)asoc
->c
.auth_random
;
420 chunksize
+= ntohs(auth_random
->length
);
422 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
423 if (auth_hmacs
->length
)
424 chunksize
+= WORD_ROUND(ntohs(auth_hmacs
->length
));
428 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
429 if (auth_chunks
->length
)
430 chunksize
+= WORD_ROUND(ntohs(auth_chunks
->length
));
434 extensions
[num_ext
] = SCTP_CID_AUTH
;
439 chunksize
+= WORD_ROUND(sizeof(sctp_supported_ext_param_t
) +
442 /* Now allocate and fill out the chunk. */
443 retval
= sctp_make_chunk(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
);
447 /* Per the advice in RFC 2960 6.4, send this reply to
448 * the source of the INIT packet.
450 retval
->transport
= chunk
->transport
;
451 retval
->subh
.init_hdr
=
452 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
453 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
454 sctp_addto_chunk(retval
, cookie_len
, cookie
);
455 if (asoc
->peer
.ecn_capable
)
456 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
458 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
459 ext_param
.param_hdr
.length
=
460 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
461 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
463 sctp_addto_param(retval
, num_ext
, extensions
);
465 if (asoc
->peer
.prsctp_capable
)
466 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
468 if (sp
->adaptation_ind
) {
469 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
470 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
471 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
472 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
475 if (asoc
->peer
.auth_capable
) {
476 sctp_addto_chunk(retval
, ntohs(auth_random
->length
),
479 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
482 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
486 /* We need to remove the const qualifier at this point. */
487 retval
->asoc
= (struct sctp_association
*) asoc
;
489 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
491 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
492 * HEARTBEAT ACK, * etc.) to the same destination transport
493 * address from which it received the DATA or control chunk
494 * to which it is replying.
496 * [INIT ACK back to where the INIT came from.]
499 retval
->transport
= chunk
->transport
;
508 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
510 * This chunk is used only during the initialization of an association.
511 * It is sent by the initiator of an association to its peer to complete
512 * the initialization process. This chunk MUST precede any DATA chunk
513 * sent within the association, but MAY be bundled with one or more DATA
514 * chunks in the same packet.
517 * 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
518 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
519 * | Type = 10 |Chunk Flags | Length |
520 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
523 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
527 * Set to zero on transmit and ignored on receipt.
529 * Length: 16 bits (unsigned integer)
531 * Set to the size of the chunk in bytes, including the 4 bytes of
532 * the chunk header and the size of the Cookie.
534 * Cookie: variable size
536 * This field must contain the exact cookie received in the
537 * State Cookie parameter from the previous INIT ACK.
539 * An implementation SHOULD make the cookie as small as possible
540 * to insure interoperability.
542 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
543 const struct sctp_chunk
*chunk
)
545 struct sctp_chunk
*retval
;
549 cookie
= asoc
->peer
.cookie
;
550 cookie_len
= asoc
->peer
.cookie_len
;
552 /* Build a cookie echo chunk. */
553 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ECHO
, 0, cookie_len
);
556 retval
->subh
.cookie_hdr
=
557 sctp_addto_chunk(retval
, cookie_len
, cookie
);
559 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
561 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
562 * HEARTBEAT ACK, * etc.) to the same destination transport
563 * address from which it * received the DATA or control chunk
564 * to which it is replying.
566 * [COOKIE ECHO back to where the INIT ACK came from.]
569 retval
->transport
= chunk
->transport
;
575 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
577 * This chunk is used only during the initialization of an
578 * association. It is used to acknowledge the receipt of a COOKIE
579 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
580 * within the association, but MAY be bundled with one or more DATA
581 * chunks or SACK chunk in the same SCTP packet.
584 * 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
585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
586 * | Type = 11 |Chunk Flags | Length = 4 |
587 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
589 * Chunk Flags: 8 bits
591 * Set to zero on transmit and ignored on receipt.
593 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
594 const struct sctp_chunk
*chunk
)
596 struct sctp_chunk
*retval
;
598 retval
= sctp_make_chunk(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0);
600 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
602 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
603 * HEARTBEAT ACK, * etc.) to the same destination transport
604 * address from which it * received the DATA or control chunk
605 * to which it is replying.
607 * [COOKIE ACK back to where the COOKIE ECHO came from.]
610 retval
->transport
= chunk
->transport
;
616 * Appendix A: Explicit Congestion Notification:
619 * RFC 2481 details a specific bit for a sender to send in the header of
620 * its next outbound TCP segment to indicate to its peer that it has
621 * reduced its congestion window. This is termed the CWR bit. For
622 * SCTP the same indication is made by including the CWR chunk.
623 * This chunk contains one data element, i.e. the TSN number that
624 * was sent in the ECNE chunk. This element represents the lowest
625 * TSN number in the datagram that was originally marked with the
629 * 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
630 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
631 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
632 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
633 * | Lowest TSN Number |
634 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
636 * Note: The CWR is considered a Control chunk.
638 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
639 const __u32 lowest_tsn
,
640 const struct sctp_chunk
*chunk
)
642 struct sctp_chunk
*retval
;
645 cwr
.lowest_tsn
= htonl(lowest_tsn
);
646 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_CWR
, 0,
647 sizeof(sctp_cwrhdr_t
));
652 retval
->subh
.ecn_cwr_hdr
=
653 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
655 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
657 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
658 * HEARTBEAT ACK, * etc.) to the same destination transport
659 * address from which it * received the DATA or control chunk
660 * to which it is replying.
662 * [Report a reduced congestion window back to where the ECNE
666 retval
->transport
= chunk
->transport
;
672 /* Make an ECNE chunk. This is a congestion experienced report. */
673 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
674 const __u32 lowest_tsn
)
676 struct sctp_chunk
*retval
;
679 ecne
.lowest_tsn
= htonl(lowest_tsn
);
680 retval
= sctp_make_chunk(asoc
, SCTP_CID_ECN_ECNE
, 0,
681 sizeof(sctp_ecnehdr_t
));
684 retval
->subh
.ecne_hdr
=
685 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
691 /* Make a DATA chunk for the given association from the provided
692 * parameters. However, do not populate the data payload.
694 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
695 const struct sctp_sndrcvinfo
*sinfo
,
696 int data_len
, __u8 flags
, __u16 ssn
)
698 struct sctp_chunk
*retval
;
699 struct sctp_datahdr dp
;
702 /* We assign the TSN as LATE as possible, not here when
703 * creating the chunk.
706 dp
.stream
= htons(sinfo
->sinfo_stream
);
707 dp
.ppid
= sinfo
->sinfo_ppid
;
709 /* Set the flags for an unordered send. */
710 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
711 flags
|= SCTP_DATA_UNORDERED
;
716 chunk_len
= sizeof(dp
) + data_len
;
717 retval
= sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, chunk_len
);
721 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
722 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
728 /* Create a selective ackowledgement (SACK) for the given
729 * association. This reports on which TSN's we've seen to date,
730 * including duplicates and gaps.
732 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
734 struct sctp_chunk
*retval
;
735 struct sctp_sackhdr sack
;
738 __u16 num_gabs
, num_dup_tsns
;
739 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
740 struct sctp_gap_ack_block gabs
[SCTP_MAX_GABS
];
742 memset(gabs
, 0, sizeof(gabs
));
743 ctsn
= sctp_tsnmap_get_ctsn(map
);
744 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn
);
746 /* How much room is needed in the chunk? */
747 num_gabs
= sctp_tsnmap_num_gabs(map
, gabs
);
748 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
750 /* Initialize the SACK header. */
751 sack
.cum_tsn_ack
= htonl(ctsn
);
752 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
753 sack
.num_gap_ack_blocks
= htons(num_gabs
);
754 sack
.num_dup_tsns
= htons(num_dup_tsns
);
757 + sizeof(struct sctp_gap_ack_block
) * num_gabs
758 + sizeof(__u32
) * num_dup_tsns
;
760 /* Create the chunk. */
761 retval
= sctp_make_chunk(asoc
, SCTP_CID_SACK
, 0, len
);
765 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
767 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
768 * HEARTBEAT ACK, etc.) to the same destination transport
769 * address from which it received the DATA or control chunk to
770 * which it is replying. This rule should also be followed if
771 * the endpoint is bundling DATA chunks together with the
774 * However, when acknowledging multiple DATA chunks received
775 * in packets from different source addresses in a single
776 * SACK, the SACK chunk may be transmitted to one of the
777 * destination transport addresses from which the DATA or
778 * control chunks being acknowledged were received.
780 * [BUG: We do not implement the following paragraph.
781 * Perhaps we should remember the last transport we used for a
782 * SACK and avoid that (if possible) if we have seen any
783 * duplicates. --piggy]
785 * When a receiver of a duplicate DATA chunk sends a SACK to a
786 * multi- homed endpoint it MAY be beneficial to vary the
787 * destination address and not use the source address of the
788 * DATA chunk. The reason being that receiving a duplicate
789 * from a multi-homed endpoint might indicate that the return
790 * path (as specified in the source address of the DATA chunk)
791 * for the SACK is broken.
793 * [Send to the address from which we last received a DATA chunk.]
795 retval
->transport
= asoc
->peer
.last_data_from
;
797 retval
->subh
.sack_hdr
=
798 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
800 /* Add the gap ack block information. */
802 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
805 /* Add the duplicate TSN information. */
807 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
808 sctp_tsnmap_get_dups(map
));
814 /* Make a SHUTDOWN chunk. */
815 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
816 const struct sctp_chunk
*chunk
)
818 struct sctp_chunk
*retval
;
819 sctp_shutdownhdr_t shut
;
822 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
823 shut
.cum_tsn_ack
= htonl(ctsn
);
825 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN
, 0,
826 sizeof(sctp_shutdownhdr_t
));
830 retval
->subh
.shutdown_hdr
=
831 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
834 retval
->transport
= chunk
->transport
;
839 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
840 const struct sctp_chunk
*chunk
)
842 struct sctp_chunk
*retval
;
844 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0);
846 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
848 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
849 * HEARTBEAT ACK, * etc.) to the same destination transport
850 * address from which it * received the DATA or control chunk
851 * to which it is replying.
853 * [ACK back to where the SHUTDOWN came from.]
856 retval
->transport
= chunk
->transport
;
861 struct sctp_chunk
*sctp_make_shutdown_complete(
862 const struct sctp_association
*asoc
,
863 const struct sctp_chunk
*chunk
)
865 struct sctp_chunk
*retval
;
868 /* Set the T-bit if we have no association (vtag will be
871 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
873 retval
= sctp_make_chunk(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
, 0);
875 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
877 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
878 * HEARTBEAT ACK, * etc.) to the same destination transport
879 * address from which it * received the DATA or control chunk
880 * to which it is replying.
882 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
886 retval
->transport
= chunk
->transport
;
891 /* Create an ABORT. Note that we set the T bit if we have no
892 * association, except when responding to an INIT (sctpimpguide 2.41).
894 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
895 const struct sctp_chunk
*chunk
,
898 struct sctp_chunk
*retval
;
901 /* Set the T-bit if we have no association and 'chunk' is not
902 * an INIT (vtag will be reflected).
905 if (chunk
&& chunk
->chunk_hdr
&&
906 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
909 flags
= SCTP_CHUNK_FLAG_T
;
912 retval
= sctp_make_chunk(asoc
, SCTP_CID_ABORT
, flags
, hint
);
914 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
916 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
917 * HEARTBEAT ACK, * etc.) to the same destination transport
918 * address from which it * received the DATA or control chunk
919 * to which it is replying.
921 * [ABORT back to where the offender came from.]
924 retval
->transport
= chunk
->transport
;
929 /* Helper to create ABORT with a NO_USER_DATA error. */
930 struct sctp_chunk
*sctp_make_abort_no_data(
931 const struct sctp_association
*asoc
,
932 const struct sctp_chunk
*chunk
, __u32 tsn
)
934 struct sctp_chunk
*retval
;
937 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
943 /* Put the tsn back into network byte order. */
944 payload
= htonl(tsn
);
945 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
946 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
948 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
950 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
951 * HEARTBEAT ACK, * etc.) to the same destination transport
952 * address from which it * received the DATA or control chunk
953 * to which it is replying.
955 * [ABORT back to where the offender came from.]
958 retval
->transport
= chunk
->transport
;
964 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
965 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
966 const struct msghdr
*msg
,
969 struct sctp_chunk
*retval
;
970 void *payload
= NULL
;
973 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
978 /* Put the msg_iov together into payload. */
979 payload
= kmalloc(paylen
, GFP_KERNEL
);
983 err
= memcpy_fromiovec(payload
, msg
->msg_iov
, paylen
);
988 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
989 sctp_addto_chunk(retval
, paylen
, payload
);
999 sctp_chunk_free(retval
);
1005 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1008 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
1012 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1014 target
= skb_put(chunk
->skb
, len
);
1017 memcpy(target
, data
, len
);
1019 memset(target
, 0, len
);
1021 /* Adjust the chunk length field. */
1022 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
1023 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1028 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1029 struct sctp_chunk
*sctp_make_abort_violation(
1030 const struct sctp_association
*asoc
,
1031 const struct sctp_chunk
*chunk
,
1032 const __u8
*payload
,
1033 const size_t paylen
)
1035 struct sctp_chunk
*retval
;
1036 struct sctp_paramhdr phdr
;
1038 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
1039 + sizeof(sctp_paramhdr_t
));
1043 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
1044 + sizeof(sctp_paramhdr_t
));
1046 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
1047 phdr
.length
= chunk
->chunk_hdr
->length
;
1048 sctp_addto_chunk(retval
, paylen
, payload
);
1049 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
1055 struct sctp_chunk
*sctp_make_violation_paramlen(
1056 const struct sctp_association
*asoc
,
1057 const struct sctp_chunk
*chunk
,
1058 struct sctp_paramhdr
*param
)
1060 struct sctp_chunk
*retval
;
1061 static const char error
[] = "The following parameter had invalid length:";
1062 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
) +
1063 sizeof(sctp_paramhdr_t
);
1065 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1069 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
,
1070 sizeof(error
) + sizeof(sctp_paramhdr_t
));
1071 sctp_addto_chunk(retval
, sizeof(error
), error
);
1072 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), param
);
1078 /* Make a HEARTBEAT chunk. */
1079 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
1080 const struct sctp_transport
*transport
,
1081 const void *payload
, const size_t paylen
)
1083 struct sctp_chunk
*retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT
,
1089 /* Cast away the 'const', as this is just telling the chunk
1090 * what transport it belongs to.
1092 retval
->transport
= (struct sctp_transport
*) transport
;
1093 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1099 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
1100 const struct sctp_chunk
*chunk
,
1101 const void *payload
, const size_t paylen
)
1103 struct sctp_chunk
*retval
;
1105 retval
= sctp_make_chunk(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
);
1109 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1111 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1113 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1114 * HEARTBEAT ACK, * etc.) to the same destination transport
1115 * address from which it * received the DATA or control chunk
1116 * to which it is replying.
1118 * [HBACK back to where the HEARTBEAT came from.]
1121 retval
->transport
= chunk
->transport
;
1127 /* Create an Operation Error chunk with the specified space reserved.
1128 * This routine can be used for containing multiple causes in the chunk.
1130 static struct sctp_chunk
*sctp_make_op_error_space(
1131 const struct sctp_association
*asoc
,
1132 const struct sctp_chunk
*chunk
,
1135 struct sctp_chunk
*retval
;
1137 retval
= sctp_make_chunk(asoc
, SCTP_CID_ERROR
, 0,
1138 sizeof(sctp_errhdr_t
) + size
);
1142 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1144 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1145 * HEARTBEAT ACK, etc.) to the same destination transport
1146 * address from which it received the DATA or control chunk
1147 * to which it is replying.
1151 retval
->transport
= chunk
->transport
;
1157 /* Create an Operation Error chunk of a fixed size,
1158 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1159 * This is a helper function to allocate an error chunk for
1160 * for those invalid parameter codes in which we may not want
1161 * to report all the errors, if the incomming chunk is large
1163 static inline struct sctp_chunk
*sctp_make_op_error_fixed(
1164 const struct sctp_association
*asoc
,
1165 const struct sctp_chunk
*chunk
)
1167 size_t size
= asoc
? asoc
->pathmtu
: 0;
1170 size
= SCTP_DEFAULT_MAXSEGMENT
;
1172 return sctp_make_op_error_space(asoc
, chunk
, size
);
1175 /* Create an Operation Error chunk. */
1176 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1177 const struct sctp_chunk
*chunk
,
1178 __be16 cause_code
, const void *payload
,
1179 size_t paylen
, size_t reserve_tail
)
1181 struct sctp_chunk
*retval
;
1183 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
+ reserve_tail
);
1187 sctp_init_cause(retval
, cause_code
, paylen
+ reserve_tail
);
1188 sctp_addto_chunk(retval
, paylen
, payload
);
1190 sctp_addto_param(retval
, reserve_tail
, NULL
);
1196 struct sctp_chunk
*sctp_make_auth(const struct sctp_association
*asoc
)
1198 struct sctp_chunk
*retval
;
1199 struct sctp_hmac
*hmac_desc
;
1200 struct sctp_authhdr auth_hdr
;
1203 /* Get the first hmac that the peer told us to use */
1204 hmac_desc
= sctp_auth_asoc_get_hmac(asoc
);
1205 if (unlikely(!hmac_desc
))
1208 retval
= sctp_make_chunk(asoc
, SCTP_CID_AUTH
, 0,
1209 hmac_desc
->hmac_len
+ sizeof(sctp_authhdr_t
));
1213 auth_hdr
.hmac_id
= htons(hmac_desc
->hmac_id
);
1214 auth_hdr
.shkey_id
= htons(asoc
->active_key_id
);
1216 retval
->subh
.auth_hdr
= sctp_addto_chunk(retval
, sizeof(sctp_authhdr_t
),
1219 hmac
= skb_put(retval
->skb
, hmac_desc
->hmac_len
);
1220 memset(hmac
, 0, hmac_desc
->hmac_len
);
1222 /* Adjust the chunk header to include the empty MAC */
1223 retval
->chunk_hdr
->length
=
1224 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1225 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1231 /********************************************************************
1232 * 2nd Level Abstractions
1233 ********************************************************************/
1235 /* Turn an skb into a chunk.
1236 * FIXME: Eventually move the structure directly inside the skb->cb[].
1238 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1239 const struct sctp_association
*asoc
,
1242 struct sctp_chunk
*retval
;
1244 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, GFP_ATOMIC
);
1250 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb
);
1253 INIT_LIST_HEAD(&retval
->list
);
1255 retval
->asoc
= (struct sctp_association
*)asoc
;
1257 retval
->has_tsn
= 0;
1258 retval
->has_ssn
= 0;
1259 retval
->rtt_in_progress
= 0;
1260 retval
->sent_at
= 0;
1261 retval
->singleton
= 1;
1262 retval
->end_of_packet
= 0;
1263 retval
->ecn_ce_done
= 0;
1264 retval
->pdiscard
= 0;
1266 /* sctpimpguide-05.txt Section 2.8.2
1267 * M1) Each time a new DATA chunk is transmitted
1268 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1269 * 'TSN.Missing.Report' count will be used to determine missing chunks
1270 * and when to fast retransmit.
1272 retval
->tsn_missing_report
= 0;
1273 retval
->tsn_gap_acked
= 0;
1274 retval
->fast_retransmit
= SCTP_CAN_FRTX
;
1276 /* If this is a fragmented message, track all fragments
1277 * of the message (for SEND_FAILED).
1281 /* Polish the bead hole. */
1282 INIT_LIST_HEAD(&retval
->transmitted_list
);
1283 INIT_LIST_HEAD(&retval
->frag_list
);
1284 SCTP_DBG_OBJCNT_INC(chunk
);
1285 atomic_set(&retval
->refcnt
, 1);
1291 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1292 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1293 union sctp_addr
*dest
)
1295 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1296 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1299 /* Extract the source address from a chunk. */
1300 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1302 /* If we have a known transport, use that. */
1303 if (chunk
->transport
) {
1304 return &chunk
->transport
->ipaddr
;
1306 /* Otherwise, extract it from the IP header. */
1307 return &chunk
->source
;
1311 /* Create a new chunk, setting the type and flags headers from the
1312 * arguments, reserving enough space for a 'paylen' byte payload.
1315 struct sctp_chunk
*sctp_make_chunk(const struct sctp_association
*asoc
,
1316 __u8 type
, __u8 flags
, int paylen
)
1318 struct sctp_chunk
*retval
;
1319 sctp_chunkhdr_t
*chunk_hdr
;
1320 struct sk_buff
*skb
;
1323 /* No need to allocate LL here, as this is only a chunk. */
1324 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
),
1329 /* Make room for the chunk header. */
1330 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1331 chunk_hdr
->type
= type
;
1332 chunk_hdr
->flags
= flags
;
1333 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1335 sk
= asoc
? asoc
->base
.sk
: NULL
;
1336 retval
= sctp_chunkify(skb
, asoc
, sk
);
1342 retval
->chunk_hdr
= chunk_hdr
;
1343 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1345 /* Determine if the chunk needs to be authenticated */
1346 if (sctp_auth_send_cid(type
, asoc
))
1349 /* Set the skb to the belonging sock for accounting. */
1358 /* Release the memory occupied by a chunk. */
1359 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1361 BUG_ON(!list_empty(&chunk
->list
));
1362 list_del_init(&chunk
->transmitted_list
);
1364 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1365 dev_kfree_skb(chunk
->skb
);
1367 SCTP_DBG_OBJCNT_DEC(chunk
);
1368 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1371 /* Possibly, free the chunk. */
1372 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1374 /* Release our reference on the message tracker. */
1376 sctp_datamsg_put(chunk
->msg
);
1378 sctp_chunk_put(chunk
);
1381 /* Grab a reference to the chunk. */
1382 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1384 atomic_inc(&ch
->refcnt
);
1387 /* Release a reference to the chunk. */
1388 void sctp_chunk_put(struct sctp_chunk
*ch
)
1390 if (atomic_dec_and_test(&ch
->refcnt
))
1391 sctp_chunk_destroy(ch
);
1394 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1397 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1401 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1402 int padlen
= WORD_ROUND(chunklen
) - chunklen
;
1404 padding
= skb_put(chunk
->skb
, padlen
);
1405 target
= skb_put(chunk
->skb
, len
);
1407 memset(padding
, 0, padlen
);
1408 memcpy(target
, data
, len
);
1410 /* Adjust the chunk length field. */
1411 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1412 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1417 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1418 * space in the chunk
1420 void *sctp_addto_chunk_fixed(struct sctp_chunk
*chunk
,
1421 int len
, const void *data
)
1423 if (skb_tailroom(chunk
->skb
) >= len
)
1424 return sctp_addto_chunk(chunk
, len
, data
);
1429 /* Append bytes from user space to the end of a chunk. Will panic if
1430 * chunk is not big enough.
1431 * Returns a kernel err value.
1433 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int off
, int len
,
1439 /* Make room in chunk for data. */
1440 target
= skb_put(chunk
->skb
, len
);
1442 /* Copy data (whole iovec) into chunk */
1443 if ((err
= memcpy_fromiovecend(target
, data
, off
, len
)))
1446 /* Adjust the chunk length field. */
1447 chunk
->chunk_hdr
->length
=
1448 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1449 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1455 /* Helper function to assign a TSN if needed. This assumes that both
1456 * the data_hdr and association have already been assigned.
1458 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1460 struct sctp_datamsg
*msg
;
1461 struct sctp_chunk
*lchunk
;
1462 struct sctp_stream
*stream
;
1469 /* All fragments will be on the same stream */
1470 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1471 stream
= &chunk
->asoc
->ssnmap
->out
;
1473 /* Now assign the sequence number to the entire message.
1474 * All fragments must have the same stream sequence number.
1477 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1478 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1481 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1482 ssn
= sctp_ssn_next(stream
, sid
);
1484 ssn
= sctp_ssn_peek(stream
, sid
);
1487 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1488 lchunk
->has_ssn
= 1;
1492 /* Helper function to assign a TSN if needed. This assumes that both
1493 * the data_hdr and association have already been assigned.
1495 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1497 if (!chunk
->has_tsn
) {
1498 /* This is the last possible instant to
1501 chunk
->subh
.data_hdr
->tsn
=
1502 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1507 /* Create a CLOSED association to use with an incoming packet. */
1508 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1509 struct sctp_chunk
*chunk
,
1512 struct sctp_association
*asoc
;
1513 struct sk_buff
*skb
;
1517 /* Create the bare association. */
1518 scope
= sctp_scope(sctp_source(chunk
));
1519 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1524 /* Create an entry for the source address of the packet. */
1525 af
= sctp_get_af_specific(ipver2af(ip_hdr(skb
)->version
));
1528 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1533 sctp_association_free(asoc
);
1537 /* Build a cookie representing asoc.
1538 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1540 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1541 const struct sctp_association
*asoc
,
1542 const struct sctp_chunk
*init_chunk
,
1544 const __u8
*raw_addrs
, int addrs_len
)
1546 sctp_cookie_param_t
*retval
;
1547 struct sctp_signed_cookie
*cookie
;
1548 struct scatterlist sg
;
1549 int headersize
, bodysize
;
1550 unsigned int keylen
;
1553 /* Header size is static data prior to the actual cookie, including
1556 headersize
= sizeof(sctp_paramhdr_t
) +
1557 (sizeof(struct sctp_signed_cookie
) -
1558 sizeof(struct sctp_cookie
));
1559 bodysize
= sizeof(struct sctp_cookie
)
1560 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1562 /* Pad out the cookie to a multiple to make the signature
1563 * functions simpler to write.
1565 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1566 bodysize
+= SCTP_COOKIE_MULTIPLE
1567 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1568 *cookie_len
= headersize
+ bodysize
;
1570 /* Clear this memory since we are sending this data structure
1571 * out on the network.
1573 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1577 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1579 /* Set up the parameter header. */
1580 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1581 retval
->p
.length
= htons(*cookie_len
);
1583 /* Copy the cookie part of the association itself. */
1584 cookie
->c
= asoc
->c
;
1585 /* Save the raw address list length in the cookie. */
1586 cookie
->c
.raw_addr_list_len
= addrs_len
;
1588 /* Remember PR-SCTP capability. */
1589 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1591 /* Save adaptation indication in the cookie. */
1592 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1594 /* Set an expiration time for the cookie. */
1595 do_gettimeofday(&cookie
->c
.expiration
);
1596 TIMEVAL_ADD(asoc
->cookie_life
, cookie
->c
.expiration
);
1598 /* Copy the peer's init packet. */
1599 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1600 ntohs(init_chunk
->chunk_hdr
->length
));
1602 /* Copy the raw local address list of the association. */
1603 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1604 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1606 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1607 struct hash_desc desc
;
1609 /* Sign the message. */
1610 sg_init_one(&sg
, &cookie
->c
, bodysize
);
1611 keylen
= SCTP_SECRET_SIZE
;
1612 key
= (char *)ep
->secret_key
[ep
->current_key
];
1613 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1616 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1617 crypto_hash_digest(&desc
, &sg
, bodysize
, cookie
->signature
))
1630 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1631 struct sctp_association
*sctp_unpack_cookie(
1632 const struct sctp_endpoint
*ep
,
1633 const struct sctp_association
*asoc
,
1634 struct sctp_chunk
*chunk
, gfp_t gfp
,
1635 int *error
, struct sctp_chunk
**errp
)
1637 struct sctp_association
*retval
= NULL
;
1638 struct sctp_signed_cookie
*cookie
;
1639 struct sctp_cookie
*bear_cookie
;
1640 int headersize
, bodysize
, fixed_size
;
1641 __u8
*digest
= ep
->digest
;
1642 struct scatterlist sg
;
1643 unsigned int keylen
, len
;
1646 struct sk_buff
*skb
= chunk
->skb
;
1648 struct hash_desc desc
;
1650 /* Header size is static data prior to the actual cookie, including
1653 headersize
= sizeof(sctp_chunkhdr_t
) +
1654 (sizeof(struct sctp_signed_cookie
) -
1655 sizeof(struct sctp_cookie
));
1656 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1657 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1659 /* Verify that the chunk looks like it even has a cookie.
1660 * There must be enough room for our cookie and our peer's
1663 len
= ntohs(chunk
->chunk_hdr
->length
);
1664 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1667 /* Verify that the cookie has been padded out. */
1668 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1671 /* Process the cookie. */
1672 cookie
= chunk
->subh
.cookie_hdr
;
1673 bear_cookie
= &cookie
->c
;
1675 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1678 /* Check the signature. */
1679 keylen
= SCTP_SECRET_SIZE
;
1680 sg_init_one(&sg
, bear_cookie
, bodysize
);
1681 key
= (char *)ep
->secret_key
[ep
->current_key
];
1682 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1685 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1686 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1687 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1688 *error
= -SCTP_IERROR_NOMEM
;
1692 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1693 /* Try the previous key. */
1694 key
= (char *)ep
->secret_key
[ep
->last_key
];
1695 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1696 if (crypto_hash_setkey(desc
.tfm
, key
, keylen
) ||
1697 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1698 *error
= -SCTP_IERROR_NOMEM
;
1702 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1703 /* Yikes! Still bad signature! */
1704 *error
= -SCTP_IERROR_BAD_SIG
;
1710 /* IG Section 2.35.2:
1711 * 3) Compare the port numbers and the verification tag contained
1712 * within the COOKIE ECHO chunk to the actual port numbers and the
1713 * verification tag within the SCTP common header of the received
1714 * packet. If these values do not match the packet MUST be silently
1717 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1718 *error
= -SCTP_IERROR_BAD_TAG
;
1722 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1723 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1724 *error
= -SCTP_IERROR_BAD_PORTS
;
1728 /* Check to see if the cookie is stale. If there is already
1729 * an association, there is no need to check cookie's expiration
1730 * for init collision case of lost COOKIE ACK.
1731 * If skb has been timestamped, then use the stamp, otherwise
1732 * use current time. This introduces a small possibility that
1733 * that a cookie may be considered expired, but his would only slow
1734 * down the new association establishment instead of every packet.
1736 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1737 skb_get_timestamp(skb
, &tv
);
1739 do_gettimeofday(&tv
);
1741 if (!asoc
&& tv_lt(bear_cookie
->expiration
, tv
)) {
1743 * Section 3.3.10.3 Stale Cookie Error (3)
1747 * Stale Cookie Error: Indicates the receipt of a valid State
1748 * Cookie that has expired.
1750 len
= ntohs(chunk
->chunk_hdr
->length
);
1751 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1753 suseconds_t usecs
= (tv
.tv_sec
-
1754 bear_cookie
->expiration
.tv_sec
) * 1000000L +
1755 tv
.tv_usec
- bear_cookie
->expiration
.tv_usec
;
1756 __be32 n
= htonl(usecs
);
1758 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1760 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1761 *error
= -SCTP_IERROR_STALE_COOKIE
;
1763 *error
= -SCTP_IERROR_NOMEM
;
1768 /* Make a new base association. */
1769 scope
= sctp_scope(sctp_source(chunk
));
1770 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1772 *error
= -SCTP_IERROR_NOMEM
;
1776 /* Set up our peer's port number. */
1777 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1779 /* Populate the association from the cookie. */
1780 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1782 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1784 *error
= -SCTP_IERROR_NOMEM
;
1788 /* Also, add the destination address. */
1789 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1790 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1791 SCTP_ADDR_SRC
, GFP_ATOMIC
);
1794 retval
->next_tsn
= retval
->c
.initial_tsn
;
1795 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1796 retval
->addip_serial
= retval
->c
.initial_tsn
;
1797 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1798 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1799 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1801 /* The INIT stuff will be done by the side effects. */
1806 sctp_association_free(retval
);
1811 /* Yikes! The packet is either corrupt or deliberately
1814 *error
= -SCTP_IERROR_MALFORMED
;
1818 /********************************************************************
1819 * 3rd Level Abstractions
1820 ********************************************************************/
1822 struct __sctp_missing
{
1825 } __attribute__((packed
));
1828 * Report a missing mandatory parameter.
1830 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1831 sctp_param_t paramtype
,
1832 struct sctp_chunk
*chunk
,
1833 struct sctp_chunk
**errp
)
1835 struct __sctp_missing report
;
1838 len
= WORD_ROUND(sizeof(report
));
1840 /* Make an ERROR chunk, preparing enough room for
1841 * returning multiple unknown parameters.
1844 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1847 report
.num_missing
= htonl(1);
1848 report
.type
= paramtype
;
1849 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1851 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1854 /* Stop processing this chunk. */
1858 /* Report an Invalid Mandatory Parameter. */
1859 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1860 struct sctp_chunk
*chunk
,
1861 struct sctp_chunk
**errp
)
1863 /* Invalid Mandatory Parameter Error has no payload. */
1866 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1869 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1871 /* Stop processing this chunk. */
1875 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1876 struct sctp_paramhdr
*param
,
1877 const struct sctp_chunk
*chunk
,
1878 struct sctp_chunk
**errp
)
1880 /* This is a fatal error. Any accumulated non-fatal errors are
1884 sctp_chunk_free(*errp
);
1886 /* Create an error chunk and fill it in with our payload. */
1887 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1893 /* Do not attempt to handle the HOST_NAME parm. However, do
1894 * send back an indicator to the peer.
1896 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1897 union sctp_params param
,
1898 struct sctp_chunk
*chunk
,
1899 struct sctp_chunk
**errp
)
1901 __u16 len
= ntohs(param
.p
->length
);
1903 /* Processing of the HOST_NAME parameter will generate an
1904 * ABORT. If we've accumulated any non-fatal errors, they
1905 * would be unrecognized parameters and we should not include
1906 * them in the ABORT.
1909 sctp_chunk_free(*errp
);
1911 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1914 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1915 sctp_addto_chunk(*errp
, len
, param
.v
);
1918 /* Stop processing this chunk. */
1922 static int sctp_verify_ext_param(union sctp_params param
)
1924 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1926 int have_asconf
= 0;
1929 for (i
= 0; i
< num_ext
; i
++) {
1930 switch (param
.ext
->chunks
[i
]) {
1934 case SCTP_CID_ASCONF
:
1935 case SCTP_CID_ASCONF_ACK
:
1941 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1942 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1943 * only if ADD-IP is turned on and we are not backward-compatible
1946 if (sctp_addip_noauth
)
1949 if (sctp_addip_enable
&& !have_auth
&& have_asconf
)
1955 static void sctp_process_ext_param(struct sctp_association
*asoc
,
1956 union sctp_params param
)
1958 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1961 for (i
= 0; i
< num_ext
; i
++) {
1962 switch (param
.ext
->chunks
[i
]) {
1963 case SCTP_CID_FWD_TSN
:
1964 if (sctp_prsctp_enable
&&
1965 !asoc
->peer
.prsctp_capable
)
1966 asoc
->peer
.prsctp_capable
= 1;
1969 /* if the peer reports AUTH, assume that he
1972 if (sctp_auth_enable
)
1973 asoc
->peer
.auth_capable
= 1;
1975 case SCTP_CID_ASCONF
:
1976 case SCTP_CID_ASCONF_ACK
:
1977 if (sctp_addip_enable
)
1978 asoc
->peer
.asconf_capable
= 1;
1986 /* RFC 3.2.1 & the Implementers Guide 2.2.
1988 * The Parameter Types are encoded such that the
1989 * highest-order two bits specify the action that must be
1990 * taken if the processing endpoint does not recognize the
1993 * 00 - Stop processing this parameter; do not process any further
1994 * parameters within this chunk
1996 * 01 - Stop processing this parameter, do not process any further
1997 * parameters within this chunk, and report the unrecognized
1998 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2000 * 10 - Skip this parameter and continue processing.
2002 * 11 - Skip this parameter and continue processing but
2003 * report the unrecognized parameter in an
2004 * 'Unrecognized Parameter' ERROR chunk.
2007 * SCTP_IERROR_NO_ERROR - continue with the chunk
2008 * SCTP_IERROR_ERROR - stop and report an error.
2009 * SCTP_IERROR_NOMEME - out of memory.
2011 static sctp_ierror_t
sctp_process_unk_param(const struct sctp_association
*asoc
,
2012 union sctp_params param
,
2013 struct sctp_chunk
*chunk
,
2014 struct sctp_chunk
**errp
)
2016 int retval
= SCTP_IERROR_NO_ERROR
;
2018 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2019 case SCTP_PARAM_ACTION_DISCARD
:
2020 retval
= SCTP_IERROR_ERROR
;
2022 case SCTP_PARAM_ACTION_SKIP
:
2024 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2025 retval
= SCTP_IERROR_ERROR
;
2027 case SCTP_PARAM_ACTION_SKIP_ERR
:
2028 /* Make an ERROR chunk, preparing enough room for
2029 * returning multiple unknown parameters.
2032 *errp
= sctp_make_op_error_fixed(asoc
, chunk
);
2035 sctp_init_cause_fixed(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2036 WORD_ROUND(ntohs(param
.p
->length
)));
2037 sctp_addto_chunk_fixed(*errp
,
2038 WORD_ROUND(ntohs(param
.p
->length
)),
2041 /* If there is no memory for generating the ERROR
2042 * report as specified, an ABORT will be triggered
2043 * to the peer and the association won't be
2046 retval
= SCTP_IERROR_NOMEM
;
2056 /* Verify variable length parameters
2058 * SCTP_IERROR_ABORT - trigger an ABORT
2059 * SCTP_IERROR_NOMEM - out of memory (abort)
2060 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2061 * SCTP_IERROR_NO_ERROR - continue with the chunk
2063 static sctp_ierror_t
sctp_verify_param(const struct sctp_association
*asoc
,
2064 union sctp_params param
,
2066 struct sctp_chunk
*chunk
,
2067 struct sctp_chunk
**err_chunk
)
2069 struct sctp_hmac_algo_param
*hmacs
;
2070 int retval
= SCTP_IERROR_NO_ERROR
;
2071 __u16 n_elt
, id
= 0;
2074 /* FIXME - This routine is not looking at each parameter per the
2075 * chunk type, i.e., unrecognized parameters should be further
2076 * identified based on the chunk id.
2079 switch (param
.p
->type
) {
2080 case SCTP_PARAM_IPV4_ADDRESS
:
2081 case SCTP_PARAM_IPV6_ADDRESS
:
2082 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2083 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2084 case SCTP_PARAM_STATE_COOKIE
:
2085 case SCTP_PARAM_HEARTBEAT_INFO
:
2086 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2087 case SCTP_PARAM_ECN_CAPABLE
:
2088 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2091 case SCTP_PARAM_SUPPORTED_EXT
:
2092 if (!sctp_verify_ext_param(param
))
2093 return SCTP_IERROR_ABORT
;
2096 case SCTP_PARAM_SET_PRIMARY
:
2097 if (sctp_addip_enable
)
2101 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2102 /* Tell the peer, we won't support this param. */
2103 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2104 retval
= SCTP_IERROR_ABORT
;
2107 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2108 if (sctp_prsctp_enable
)
2112 case SCTP_PARAM_RANDOM
:
2113 if (!sctp_auth_enable
)
2116 /* SCTP-AUTH: Secion 6.1
2117 * If the random number is not 32 byte long the association
2118 * MUST be aborted. The ABORT chunk SHOULD contain the error
2119 * cause 'Protocol Violation'.
2121 if (SCTP_AUTH_RANDOM_LENGTH
!=
2122 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) {
2123 sctp_process_inv_paramlength(asoc
, param
.p
,
2125 retval
= SCTP_IERROR_ABORT
;
2129 case SCTP_PARAM_CHUNKS
:
2130 if (!sctp_auth_enable
)
2133 /* SCTP-AUTH: Section 3.2
2134 * The CHUNKS parameter MUST be included once in the INIT or
2135 * INIT-ACK chunk if the sender wants to receive authenticated
2136 * chunks. Its maximum length is 260 bytes.
2138 if (260 < ntohs(param
.p
->length
)) {
2139 sctp_process_inv_paramlength(asoc
, param
.p
,
2141 retval
= SCTP_IERROR_ABORT
;
2145 case SCTP_PARAM_HMAC_ALGO
:
2146 if (!sctp_auth_enable
)
2149 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2150 n_elt
= (ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) >> 1;
2152 /* SCTP-AUTH: Section 6.1
2153 * The HMAC algorithm based on SHA-1 MUST be supported and
2154 * included in the HMAC-ALGO parameter.
2156 for (i
= 0; i
< n_elt
; i
++) {
2157 id
= ntohs(hmacs
->hmac_ids
[i
]);
2159 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2163 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2164 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2166 retval
= SCTP_IERROR_ABORT
;
2171 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2172 ntohs(param
.p
->type
), cid
);
2173 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2179 /* Verify the INIT packet before we process it. */
2180 int sctp_verify_init(const struct sctp_association
*asoc
,
2182 sctp_init_chunk_t
*peer_init
,
2183 struct sctp_chunk
*chunk
,
2184 struct sctp_chunk
**errp
)
2186 union sctp_params param
;
2190 /* Verify stream values are non-zero. */
2191 if ((0 == peer_init
->init_hdr
.num_outbound_streams
) ||
2192 (0 == peer_init
->init_hdr
.num_inbound_streams
) ||
2193 (0 == peer_init
->init_hdr
.init_tag
) ||
2194 (SCTP_DEFAULT_MINWINDOW
> ntohl(peer_init
->init_hdr
.a_rwnd
))) {
2196 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2199 /* Check for missing mandatory parameters. */
2200 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2202 if (SCTP_PARAM_STATE_COOKIE
== param
.p
->type
)
2205 } /* for (loop through all parameters) */
2207 /* There is a possibility that a parameter length was bad and
2208 * in that case we would have stoped walking the parameters.
2209 * The current param.p would point at the bad one.
2210 * Current consensus on the mailing list is to generate a PROTOCOL
2211 * VIOLATION error. We build the ERROR chunk here and let the normal
2212 * error handling code build and send the packet.
2214 if (param
.v
!= (void*)chunk
->chunk_end
)
2215 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2217 /* The only missing mandatory param possible today is
2218 * the state cookie for an INIT-ACK chunk.
2220 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2221 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2224 /* Verify all the variable length parameters */
2225 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2227 result
= sctp_verify_param(asoc
, param
, cid
, chunk
, errp
);
2229 case SCTP_IERROR_ABORT
:
2230 case SCTP_IERROR_NOMEM
:
2232 case SCTP_IERROR_ERROR
:
2234 case SCTP_IERROR_NO_ERROR
:
2239 } /* for (loop through all parameters) */
2244 /* Unpack the parameters in an INIT packet into an association.
2245 * Returns 0 on failure, else success.
2246 * FIXME: This is an association method.
2248 int sctp_process_init(struct sctp_association
*asoc
, sctp_cid_t cid
,
2249 const union sctp_addr
*peer_addr
,
2250 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
2252 union sctp_params param
;
2253 struct sctp_transport
*transport
;
2254 struct list_head
*pos
, *temp
;
2257 /* We must include the address that the INIT packet came from.
2258 * This is the only address that matters for an INIT packet.
2259 * When processing a COOKIE ECHO, we retrieve the from address
2260 * of the INIT from the cookie.
2263 /* This implementation defaults to making the first transport
2264 * added as the primary transport. The source address seems to
2265 * be a a better choice than any of the embedded addresses.
2268 if(!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2272 /* Process the initialization parameters. */
2273 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2275 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2279 /* AUTH: After processing the parameters, make sure that we
2280 * have all the required info to potentially do authentications.
2282 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2283 !asoc
->peer
.peer_hmacs
))
2284 asoc
->peer
.auth_capable
= 0;
2286 /* In a non-backward compatible mode, if the peer claims
2287 * support for ADD-IP but not AUTH, the ADD-IP spec states
2288 * that we MUST ABORT the association. Section 6. The section
2289 * also give us an option to silently ignore the packet, which
2290 * is what we'll do here.
2292 if (!sctp_addip_noauth
&&
2293 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2294 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2296 SCTP_PARAM_SET_PRIMARY
);
2297 asoc
->peer
.asconf_capable
= 0;
2301 /* Walk list of transports, removing transports in the UNKNOWN state. */
2302 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2303 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2304 if (transport
->state
== SCTP_UNKNOWN
) {
2305 sctp_assoc_rm_peer(asoc
, transport
);
2309 /* The fixed INIT headers are always in network byte
2312 asoc
->peer
.i
.init_tag
=
2313 ntohl(peer_init
->init_hdr
.init_tag
);
2314 asoc
->peer
.i
.a_rwnd
=
2315 ntohl(peer_init
->init_hdr
.a_rwnd
);
2316 asoc
->peer
.i
.num_outbound_streams
=
2317 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2318 asoc
->peer
.i
.num_inbound_streams
=
2319 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2320 asoc
->peer
.i
.initial_tsn
=
2321 ntohl(peer_init
->init_hdr
.initial_tsn
);
2323 /* Apply the upper bounds for output streams based on peer's
2324 * number of inbound streams.
2326 if (asoc
->c
.sinit_num_ostreams
>
2327 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2328 asoc
->c
.sinit_num_ostreams
=
2329 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2332 if (asoc
->c
.sinit_max_instreams
>
2333 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2334 asoc
->c
.sinit_max_instreams
=
2335 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2338 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2339 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2341 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2342 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2344 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2345 cookie
= asoc
->peer
.cookie
;
2347 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2348 if (!asoc
->peer
.cookie
)
2352 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2353 * high (for example, implementations MAY use the size of the receiver
2354 * advertised window).
2356 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2358 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2361 /* Set up the TSN tracking pieces. */
2362 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2363 asoc
->peer
.i
.initial_tsn
, gfp
))
2366 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2368 * The stream sequence number in all the streams shall start
2369 * from 0 when the association is established. Also, when the
2370 * stream sequence number reaches the value 65535 the next
2371 * stream sequence number shall be set to 0.
2374 /* Allocate storage for the negotiated streams if it is not a temporary
2380 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
2381 asoc
->c
.sinit_num_ostreams
, gfp
);
2385 error
= sctp_assoc_set_id(asoc
, gfp
);
2390 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2392 * When an endpoint has an ASCONF signaled change to be sent to the
2393 * remote endpoint it should do the following:
2395 * A2) A serial number should be assigned to the Chunk. The serial
2396 * number should be a monotonically increasing number. All serial
2397 * numbers are defined to be initialized at the start of the
2398 * association to the same value as the Initial TSN.
2400 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2404 /* Release the transport structures. */
2405 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2406 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2407 if (transport
->state
!= SCTP_ACTIVE
)
2408 sctp_assoc_rm_peer(asoc
, transport
);
2416 /* Update asoc with the option described in param.
2418 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2420 * asoc is the association to update.
2421 * param is the variable length parameter to use for update.
2422 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2423 * If the current packet is an INIT we want to minimize the amount of
2424 * work we do. In particular, we should not build transport
2425 * structures for the addresses.
2427 static int sctp_process_param(struct sctp_association
*asoc
,
2428 union sctp_params param
,
2429 const union sctp_addr
*peer_addr
,
2432 union sctp_addr addr
;
2439 union sctp_addr_param
*addr_param
;
2440 struct sctp_transport
*t
;
2442 /* We maintain all INIT parameters in network byte order all the
2443 * time. This allows us to not worry about whether the parameters
2444 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2446 switch (param
.p
->type
) {
2447 case SCTP_PARAM_IPV6_ADDRESS
:
2448 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2452 case SCTP_PARAM_IPV4_ADDRESS
:
2453 /* v4 addresses are not allowed on v6-only socket */
2454 if (ipv6_only_sock(asoc
->base
.sk
))
2457 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2458 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2459 scope
= sctp_scope(peer_addr
);
2460 if (sctp_in_scope(&addr
, scope
))
2461 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2465 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2466 if (!sctp_cookie_preserve_enable
)
2469 stale
= ntohl(param
.life
->lifespan_increment
);
2471 /* Suggested Cookie Life span increment's unit is msec,
2474 asoc
->cookie_life
.tv_sec
+= stale
/ 1000;
2475 asoc
->cookie_life
.tv_usec
+= (stale
% 1000) * 1000;
2478 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2479 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2482 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2483 /* Turn off the default values first so we'll know which
2484 * ones are really set by the peer.
2486 asoc
->peer
.ipv4_address
= 0;
2487 asoc
->peer
.ipv6_address
= 0;
2489 /* Assume that peer supports the address family
2490 * by which it sends a packet.
2492 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2493 asoc
->peer
.ipv6_address
= 1;
2494 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2495 asoc
->peer
.ipv4_address
= 1;
2497 /* Cycle through address types; avoid divide by 0. */
2498 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2500 sat
/= sizeof(__u16
);
2502 for (i
= 0; i
< sat
; ++i
) {
2503 switch (param
.sat
->types
[i
]) {
2504 case SCTP_PARAM_IPV4_ADDRESS
:
2505 asoc
->peer
.ipv4_address
= 1;
2508 case SCTP_PARAM_IPV6_ADDRESS
:
2509 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2510 asoc
->peer
.ipv6_address
= 1;
2513 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2514 asoc
->peer
.hostname_address
= 1;
2517 default: /* Just ignore anything else. */
2523 case SCTP_PARAM_STATE_COOKIE
:
2524 asoc
->peer
.cookie_len
=
2525 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2526 asoc
->peer
.cookie
= param
.cookie
->body
;
2529 case SCTP_PARAM_HEARTBEAT_INFO
:
2530 /* Would be odd to receive, but it causes no problems. */
2533 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2534 /* Rejected during verify stage. */
2537 case SCTP_PARAM_ECN_CAPABLE
:
2538 asoc
->peer
.ecn_capable
= 1;
2541 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2542 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2545 case SCTP_PARAM_SET_PRIMARY
:
2546 if (!sctp_addip_enable
)
2549 addr_param
= param
.v
+ sizeof(sctp_addip_param_t
);
2551 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2552 af
->from_addr_param(&addr
, addr_param
,
2553 htons(asoc
->peer
.port
), 0);
2555 /* if the address is invalid, we can't process it.
2556 * XXX: see spec for what to do.
2558 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2561 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2565 sctp_assoc_set_primary(asoc
, t
);
2568 case SCTP_PARAM_SUPPORTED_EXT
:
2569 sctp_process_ext_param(asoc
, param
);
2572 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2573 if (sctp_prsctp_enable
) {
2574 asoc
->peer
.prsctp_capable
= 1;
2580 case SCTP_PARAM_RANDOM
:
2581 if (!sctp_auth_enable
)
2584 /* Save peer's random parameter */
2585 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2586 ntohs(param
.p
->length
), gfp
);
2587 if (!asoc
->peer
.peer_random
) {
2593 case SCTP_PARAM_HMAC_ALGO
:
2594 if (!sctp_auth_enable
)
2597 /* Save peer's HMAC list */
2598 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2599 ntohs(param
.p
->length
), gfp
);
2600 if (!asoc
->peer
.peer_hmacs
) {
2605 /* Set the default HMAC the peer requested*/
2606 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2609 case SCTP_PARAM_CHUNKS
:
2610 if (!sctp_auth_enable
)
2613 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2614 ntohs(param
.p
->length
), gfp
);
2615 if (!asoc
->peer
.peer_chunks
)
2620 /* Any unrecognized parameters should have been caught
2621 * and handled by sctp_verify_param() which should be
2622 * called prior to this routine. Simply log the error
2625 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2626 ntohs(param
.p
->type
), asoc
);
2633 /* Select a new verification tag. */
2634 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2636 /* I believe that this random number generator complies with RFC1750.
2637 * A tag of 0 is reserved for special cases (e.g. INIT).
2642 get_random_bytes(&x
, sizeof(__u32
));
2648 /* Select an initial TSN to send during startup. */
2649 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2653 get_random_bytes(&retval
, sizeof(__u32
));
2658 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2660 * 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
2661 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2662 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2663 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2665 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2666 * | Address Parameter |
2667 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2668 * | ASCONF Parameter #1 |
2669 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2673 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2674 * | ASCONF Parameter #N |
2675 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2677 * Address Parameter and other parameter will not be wrapped in this function
2679 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2680 union sctp_addr
*addr
,
2683 sctp_addiphdr_t asconf
;
2684 struct sctp_chunk
*retval
;
2685 int length
= sizeof(asconf
) + vparam_len
;
2686 union sctp_addr_param addrparam
;
2688 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2690 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2695 /* Create the chunk. */
2696 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF
, 0, length
);
2700 asconf
.serial
= htonl(asoc
->addip_serial
++);
2702 retval
->subh
.addip_hdr
=
2703 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2704 retval
->param_hdr
.v
=
2705 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2711 * 3.2.1 Add IP Address
2713 * 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
2714 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2715 * | Type = 0xC001 | Length = Variable |
2716 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2717 * | ASCONF-Request Correlation ID |
2718 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2719 * | Address Parameter |
2720 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2722 * 3.2.2 Delete IP Address
2724 * 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
2725 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2726 * | Type = 0xC002 | Length = Variable |
2727 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2728 * | ASCONF-Request Correlation ID |
2729 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2730 * | Address Parameter |
2731 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2734 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2735 union sctp_addr
*laddr
,
2736 struct sockaddr
*addrs
,
2740 sctp_addip_param_t param
;
2741 struct sctp_chunk
*retval
;
2742 union sctp_addr_param addr_param
;
2743 union sctp_addr
*addr
;
2746 int paramlen
= sizeof(param
);
2747 int addr_param_len
= 0;
2751 /* Get total length of all the address parameters. */
2753 for (i
= 0; i
< addrcnt
; i
++) {
2754 addr
= (union sctp_addr
*)addr_buf
;
2755 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2756 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2758 totallen
+= paramlen
;
2759 totallen
+= addr_param_len
;
2761 addr_buf
+= af
->sockaddr_len
;
2764 /* Create an asconf chunk with the required length. */
2765 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2769 /* Add the address parameters to the asconf chunk. */
2771 for (i
= 0; i
< addrcnt
; i
++) {
2772 addr
= (union sctp_addr
*)addr_buf
;
2773 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2774 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2775 param
.param_hdr
.type
= flags
;
2776 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2779 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2780 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2782 addr_buf
+= af
->sockaddr_len
;
2788 * 3.2.4 Set Primary IP Address
2790 * 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
2791 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2792 * | Type =0xC004 | Length = Variable |
2793 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2794 * | ASCONF-Request Correlation ID |
2795 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2796 * | Address Parameter |
2797 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2799 * Create an ASCONF chunk with Set Primary IP address parameter.
2801 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2802 union sctp_addr
*addr
)
2804 sctp_addip_param_t param
;
2805 struct sctp_chunk
*retval
;
2806 int len
= sizeof(param
);
2807 union sctp_addr_param addrparam
;
2809 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2811 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2816 /* Create the chunk and make asconf header. */
2817 retval
= sctp_make_asconf(asoc
, addr
, len
);
2821 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2822 param
.param_hdr
.length
= htons(len
);
2825 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2826 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2831 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2833 * 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
2834 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2835 * | Type = 0x80 | Chunk Flags | Chunk Length |
2836 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2838 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2839 * | ASCONF Parameter Response#1 |
2840 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2844 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2845 * | ASCONF Parameter Response#N |
2846 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2848 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2850 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2851 __u32 serial
, int vparam_len
)
2853 sctp_addiphdr_t asconf
;
2854 struct sctp_chunk
*retval
;
2855 int length
= sizeof(asconf
) + vparam_len
;
2857 /* Create the chunk. */
2858 retval
= sctp_make_chunk(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
);
2862 asconf
.serial
= htonl(serial
);
2864 retval
->subh
.addip_hdr
=
2865 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2870 /* Add response parameters to an ASCONF_ACK chunk. */
2871 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2872 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2874 sctp_addip_param_t ack_param
;
2875 sctp_errhdr_t err_param
;
2876 int asconf_param_len
= 0;
2877 int err_param_len
= 0;
2878 __be16 response_type
;
2880 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2881 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2883 response_type
= SCTP_PARAM_ERR_CAUSE
;
2884 err_param_len
= sizeof(err_param
);
2887 ntohs(asconf_param
->param_hdr
.length
);
2890 /* Add Success Indication or Error Cause Indication parameter. */
2891 ack_param
.param_hdr
.type
= response_type
;
2892 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2895 ack_param
.crr_id
= crr_id
;
2896 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2898 if (SCTP_ERROR_NO_ERROR
== err_code
)
2901 /* Add Error Cause parameter. */
2902 err_param
.cause
= err_code
;
2903 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2904 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2906 /* Add the failed TLV copied from ASCONF chunk. */
2908 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
2911 /* Process a asconf parameter. */
2912 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
2913 struct sctp_chunk
*asconf
,
2914 sctp_addip_param_t
*asconf_param
)
2916 struct sctp_transport
*peer
;
2918 union sctp_addr addr
;
2919 union sctp_addr_param
*addr_param
;
2921 addr_param
= (union sctp_addr_param
*)
2922 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
2924 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
2925 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
2926 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
2927 return SCTP_ERROR_UNKNOWN_PARAM
;
2929 switch (addr_param
->v4
.param_hdr
.type
) {
2930 case SCTP_PARAM_IPV6_ADDRESS
:
2931 if (!asoc
->peer
.ipv6_address
)
2932 return SCTP_ERROR_DNS_FAILED
;
2934 case SCTP_PARAM_IPV4_ADDRESS
:
2935 if (!asoc
->peer
.ipv4_address
)
2936 return SCTP_ERROR_DNS_FAILED
;
2939 return SCTP_ERROR_DNS_FAILED
;
2942 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
2944 return SCTP_ERROR_DNS_FAILED
;
2946 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
2948 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
2949 * or multicast address.
2950 * (note: wildcard is permitted and requires special handling so
2951 * make sure we check for that)
2953 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
2954 return SCTP_ERROR_DNS_FAILED
;
2956 switch (asconf_param
->param_hdr
.type
) {
2957 case SCTP_PARAM_ADD_IP
:
2959 * If the address 0.0.0.0 or ::0 is provided, the source
2960 * address of the packet MUST be added.
2962 if (af
->is_any(&addr
))
2963 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
2965 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
2966 * request and does not have the local resources to add this
2967 * new address to the association, it MUST return an Error
2968 * Cause TLV set to the new error code 'Operation Refused
2969 * Due to Resource Shortage'.
2972 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
2974 return SCTP_ERROR_RSRC_LOW
;
2976 /* Start the heartbeat timer. */
2977 if (!mod_timer(&peer
->hb_timer
, sctp_transport_timeout(peer
)))
2978 sctp_transport_hold(peer
);
2980 case SCTP_PARAM_DEL_IP
:
2981 /* ADDIP 4.3 D7) If a request is received to delete the
2982 * last remaining IP address of a peer endpoint, the receiver
2983 * MUST send an Error Cause TLV with the error cause set to the
2984 * new error code 'Request to Delete Last Remaining IP Address'.
2986 if (asoc
->peer
.transport_count
== 1)
2987 return SCTP_ERROR_DEL_LAST_IP
;
2989 /* ADDIP 4.3 D8) If a request is received to delete an IP
2990 * address which is also the source address of the IP packet
2991 * which contained the ASCONF chunk, the receiver MUST reject
2992 * this request. To reject the request the receiver MUST send
2993 * an Error Cause TLV set to the new error code 'Request to
2994 * Delete Source IP Address'
2996 if (sctp_cmp_addr_exact(sctp_source(asconf
), &addr
))
2997 return SCTP_ERROR_DEL_SRC_IP
;
3000 * If the address 0.0.0.0 or ::0 is provided, all
3001 * addresses of the peer except the source address of the
3002 * packet MUST be deleted.
3004 if (af
->is_any(&addr
)) {
3005 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3006 sctp_assoc_del_nonprimary_peers(asoc
,
3009 sctp_assoc_del_peer(asoc
, &addr
);
3011 case SCTP_PARAM_SET_PRIMARY
:
3012 /* ADDIP Section 4.2.4
3013 * If the address 0.0.0.0 or ::0 is provided, the receiver
3014 * MAY mark the source address of the packet as its
3017 if (af
->is_any(&addr
))
3018 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3020 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3022 return SCTP_ERROR_DNS_FAILED
;
3024 sctp_assoc_set_primary(asoc
, peer
);
3028 return SCTP_ERROR_NO_ERROR
;
3031 /* Verify the ASCONF packet before we process it. */
3032 int sctp_verify_asconf(const struct sctp_association
*asoc
,
3033 struct sctp_paramhdr
*param_hdr
, void *chunk_end
,
3034 struct sctp_paramhdr
**errp
) {
3035 sctp_addip_param_t
*asconf_param
;
3036 union sctp_params param
;
3039 param
.v
= (sctp_paramhdr_t
*) param_hdr
;
3040 while (param
.v
<= chunk_end
- sizeof(sctp_paramhdr_t
)) {
3041 length
= ntohs(param
.p
->length
);
3044 if (param
.v
> chunk_end
- length
||
3045 length
< sizeof(sctp_paramhdr_t
))
3048 switch (param
.p
->type
) {
3049 case SCTP_PARAM_ADD_IP
:
3050 case SCTP_PARAM_DEL_IP
:
3051 case SCTP_PARAM_SET_PRIMARY
:
3052 asconf_param
= (sctp_addip_param_t
*)param
.v
;
3053 plen
= ntohs(asconf_param
->param_hdr
.length
);
3054 if (plen
< sizeof(sctp_addip_param_t
) +
3055 sizeof(sctp_paramhdr_t
))
3058 case SCTP_PARAM_SUCCESS_REPORT
:
3059 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3060 if (length
!= sizeof(sctp_addip_param_t
))
3068 param
.v
+= WORD_ROUND(length
);
3071 if (param
.v
!= chunk_end
)
3077 /* Process an incoming ASCONF chunk with the next expected serial no. and
3078 * return an ASCONF_ACK chunk to be sent in response.
3080 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3081 struct sctp_chunk
*asconf
)
3083 sctp_addiphdr_t
*hdr
;
3084 union sctp_addr_param
*addr_param
;
3085 sctp_addip_param_t
*asconf_param
;
3086 struct sctp_chunk
*asconf_ack
;
3092 int all_param_pass
= 1;
3094 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) - sizeof(sctp_chunkhdr_t
);
3095 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
3096 serial
= ntohl(hdr
->serial
);
3098 /* Skip the addiphdr and store a pointer to address parameter. */
3099 length
= sizeof(sctp_addiphdr_t
);
3100 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3101 chunk_len
-= length
;
3103 /* Skip the address parameter and store a pointer to the first
3106 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
3107 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
3108 chunk_len
-= length
;
3110 /* create an ASCONF_ACK chunk.
3111 * Based on the definitions of parameters, we know that the size of
3112 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
3115 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 2);
3119 /* Process the TLVs contained within the ASCONF chunk. */
3120 while (chunk_len
> 0) {
3121 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3124 * If an error response is received for a TLV parameter,
3125 * all TLVs with no response before the failed TLV are
3126 * considered successful if not reported. All TLVs after
3127 * the failed response are considered unsuccessful unless
3128 * a specific success indication is present for the parameter.
3130 if (SCTP_ERROR_NO_ERROR
!= err_code
)
3133 if (!all_param_pass
)
3134 sctp_add_asconf_response(asconf_ack
,
3135 asconf_param
->crr_id
, err_code
,
3138 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3139 * an IP address sends an 'Out of Resource' in its response, it
3140 * MUST also fail any subsequent add or delete requests bundled
3143 if (SCTP_ERROR_RSRC_LOW
== err_code
)
3146 /* Move to the next ASCONF param. */
3147 length
= ntohs(asconf_param
->param_hdr
.length
);
3148 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
3150 chunk_len
-= length
;
3154 asoc
->peer
.addip_serial
++;
3156 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3157 * after freeing the reference to old asconf ack if any.
3160 sctp_chunk_hold(asconf_ack
);
3161 list_add_tail(&asconf_ack
->transmitted_list
,
3162 &asoc
->asconf_ack_list
);
3168 /* Process a asconf parameter that is successfully acked. */
3169 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3170 sctp_addip_param_t
*asconf_param
)
3173 union sctp_addr addr
;
3174 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3175 union sctp_addr_param
*addr_param
;
3176 struct sctp_transport
*transport
;
3177 struct sctp_sockaddr_entry
*saddr
;
3179 addr_param
= (union sctp_addr_param
*)
3180 ((void *)asconf_param
+ sizeof(sctp_addip_param_t
));
3182 /* We have checked the packet before, so we do not check again. */
3183 af
= sctp_get_af_specific(param_type2af(addr_param
->v4
.param_hdr
.type
));
3184 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3186 switch (asconf_param
->param_hdr
.type
) {
3187 case SCTP_PARAM_ADD_IP
:
3188 /* This is always done in BH context with a socket lock
3189 * held, so the list can not change.
3192 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3193 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3194 saddr
->state
= SCTP_ADDR_SRC
;
3197 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3199 if (transport
->state
== SCTP_ACTIVE
)
3201 dst_release(transport
->dst
);
3202 sctp_transport_route(transport
, NULL
,
3203 sctp_sk(asoc
->base
.sk
));
3206 case SCTP_PARAM_DEL_IP
:
3208 sctp_del_bind_addr(bp
, &addr
);
3210 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3212 dst_release(transport
->dst
);
3213 sctp_transport_route(transport
, NULL
,
3214 sctp_sk(asoc
->base
.sk
));
3222 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3223 * for the given asconf parameter. If there is no response for this parameter,
3224 * return the error code based on the third argument 'no_err'.
3226 * A7) If an error response is received for a TLV parameter, all TLVs with no
3227 * response before the failed TLV are considered successful if not reported.
3228 * All TLVs after the failed response are considered unsuccessful unless a
3229 * specific success indication is present for the parameter.
3231 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3232 sctp_addip_param_t
*asconf_param
,
3235 sctp_addip_param_t
*asconf_ack_param
;
3236 sctp_errhdr_t
*err_param
;
3242 err_code
= SCTP_ERROR_NO_ERROR
;
3244 err_code
= SCTP_ERROR_REQ_REFUSED
;
3246 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3247 sizeof(sctp_chunkhdr_t
);
3249 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3250 * the first asconf_ack parameter.
3252 length
= sizeof(sctp_addiphdr_t
);
3253 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
3255 asconf_ack_len
-= length
;
3257 while (asconf_ack_len
> 0) {
3258 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3259 switch(asconf_ack_param
->param_hdr
.type
) {
3260 case SCTP_PARAM_SUCCESS_REPORT
:
3261 return SCTP_ERROR_NO_ERROR
;
3262 case SCTP_PARAM_ERR_CAUSE
:
3263 length
= sizeof(sctp_addip_param_t
);
3264 err_param
= (sctp_errhdr_t
*)
3265 ((void *)asconf_ack_param
+ length
);
3266 asconf_ack_len
-= length
;
3267 if (asconf_ack_len
> 0)
3268 return err_param
->cause
;
3270 return SCTP_ERROR_INV_PARAM
;
3273 return SCTP_ERROR_INV_PARAM
;
3277 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3278 asconf_ack_param
= (sctp_addip_param_t
*)
3279 ((void *)asconf_ack_param
+ length
);
3280 asconf_ack_len
-= length
;
3286 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3287 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3288 struct sctp_chunk
*asconf_ack
)
3290 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3291 union sctp_addr_param
*addr_param
;
3292 sctp_addip_param_t
*asconf_param
;
3294 int asconf_len
= asconf
->skb
->len
;
3295 int all_param_pass
= 0;
3298 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3300 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3301 * a pointer to address parameter.
3303 length
= sizeof(sctp_addip_chunk_t
);
3304 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3305 asconf_len
-= length
;
3307 /* Skip the address parameter in the last asconf sent and store a
3308 * pointer to the first asconf parameter.
3310 length
= ntohs(addr_param
->v4
.param_hdr
.length
);
3311 asconf_param
= (sctp_addip_param_t
*)((void *)addr_param
+ length
);
3312 asconf_len
-= length
;
3315 * A8) If there is no response(s) to specific TLV parameter(s), and no
3316 * failures are indicated, then all request(s) are considered
3319 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
3322 /* Process the TLVs contained in the last sent ASCONF chunk. */
3323 while (asconf_len
> 0) {
3325 err_code
= SCTP_ERROR_NO_ERROR
;
3327 err_code
= sctp_get_asconf_response(asconf_ack
,
3330 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3335 case SCTP_ERROR_NO_ERROR
:
3336 sctp_asconf_param_success(asoc
, asconf_param
);
3339 case SCTP_ERROR_RSRC_LOW
:
3343 case SCTP_ERROR_UNKNOWN_PARAM
:
3344 /* Disable sending this type of asconf parameter in
3347 asoc
->peer
.addip_disabled_mask
|=
3348 asconf_param
->param_hdr
.type
;
3351 case SCTP_ERROR_REQ_REFUSED
:
3352 case SCTP_ERROR_DEL_LAST_IP
:
3353 case SCTP_ERROR_DEL_SRC_IP
:
3358 /* Skip the processed asconf parameter and move to the next
3361 length
= ntohs(asconf_param
->param_hdr
.length
);
3362 asconf_param
= (sctp_addip_param_t
*)((void *)asconf_param
+
3364 asconf_len
-= length
;
3367 /* Free the cached last sent asconf chunk. */
3368 list_del_init(&asconf
->transmitted_list
);
3369 sctp_chunk_free(asconf
);
3370 asoc
->addip_last_asconf
= NULL
;
3375 /* Make a FWD TSN chunk. */
3376 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3377 __u32 new_cum_tsn
, size_t nstreams
,
3378 struct sctp_fwdtsn_skip
*skiplist
)
3380 struct sctp_chunk
*retval
= NULL
;
3381 struct sctp_fwdtsn_chunk
*ftsn_chunk
;
3382 struct sctp_fwdtsn_hdr ftsn_hdr
;
3383 struct sctp_fwdtsn_skip skip
;
3387 hint
= (nstreams
+ 1) * sizeof(__u32
);
3389 retval
= sctp_make_chunk(asoc
, SCTP_CID_FWD_TSN
, 0, hint
);
3394 ftsn_chunk
= (struct sctp_fwdtsn_chunk
*)retval
->subh
.fwdtsn_hdr
;
3396 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3397 retval
->subh
.fwdtsn_hdr
=
3398 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3400 for (i
= 0; i
< nstreams
; i
++) {
3401 skip
.stream
= skiplist
[i
].stream
;
3402 skip
.ssn
= skiplist
[i
].ssn
;
3403 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);