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 Intel Corp.
7 * This file is part of the SCTP kernel implementation
9 * These functions manipulate sctp tsn mapping array.
11 * This SCTP implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This SCTP implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, see
25 * <http://www.gnu.org/licenses/>.
27 * Please send any bug reports or fixes you make to the
29 * lksctp developers <linux-sctp@vger.kernel.org>
31 * Written or modified by:
32 * Xin Long <lucien.xin@gmail.com>
35 #include <net/sctp/sctp.h>
36 #include <net/sctp/sm.h>
38 struct sctp_stream
*sctp_stream_new(__u16 incnt
, __u16 outcnt
, gfp_t gfp
)
40 struct sctp_stream
*stream
;
43 stream
= kzalloc(sizeof(*stream
), gfp
);
47 stream
->outcnt
= outcnt
;
48 stream
->out
= kcalloc(stream
->outcnt
, sizeof(*stream
->out
), gfp
);
53 for (i
= 0; i
< stream
->outcnt
; i
++)
54 stream
->out
[i
].state
= SCTP_STREAM_OPEN
;
56 stream
->incnt
= incnt
;
57 stream
->in
= kcalloc(stream
->incnt
, sizeof(*stream
->in
), gfp
);
67 void sctp_stream_free(struct sctp_stream
*stream
)
69 if (unlikely(!stream
))
77 void sctp_stream_clear(struct sctp_stream
*stream
)
81 for (i
= 0; i
< stream
->outcnt
; i
++)
82 stream
->out
[i
].ssn
= 0;
84 for (i
= 0; i
< stream
->incnt
; i
++)
85 stream
->in
[i
].ssn
= 0;
88 static int sctp_send_reconf(struct sctp_association
*asoc
,
89 struct sctp_chunk
*chunk
)
91 struct net
*net
= sock_net(asoc
->base
.sk
);
94 retval
= sctp_primitive_RECONF(net
, asoc
, chunk
);
96 sctp_chunk_free(chunk
);
101 int sctp_send_reset_streams(struct sctp_association
*asoc
,
102 struct sctp_reset_streams
*params
)
104 struct sctp_stream
*stream
= asoc
->stream
;
105 __u16 i
, str_nums
, *str_list
;
106 struct sctp_chunk
*chunk
;
107 int retval
= -EINVAL
;
110 if (!asoc
->peer
.reconf_capable
||
111 !(asoc
->strreset_enable
& SCTP_ENABLE_RESET_STREAM_REQ
)) {
112 retval
= -ENOPROTOOPT
;
116 if (asoc
->strreset_outstanding
) {
117 retval
= -EINPROGRESS
;
121 out
= params
->srs_flags
& SCTP_STREAM_RESET_OUTGOING
;
122 in
= params
->srs_flags
& SCTP_STREAM_RESET_INCOMING
;
126 str_nums
= params
->srs_number_streams
;
127 str_list
= params
->srs_stream_list
;
129 for (i
= 0; i
< str_nums
; i
++)
130 if (str_list
[i
] >= stream
->outcnt
)
134 for (i
= 0; i
< str_nums
; i
++)
135 if (str_list
[i
] >= stream
->incnt
)
138 for (i
= 0; i
< str_nums
; i
++)
139 str_list
[i
] = htons(str_list
[i
]);
141 chunk
= sctp_make_strreset_req(asoc
, str_nums
, str_list
, out
, in
);
143 for (i
= 0; i
< str_nums
; i
++)
144 str_list
[i
] = ntohs(str_list
[i
]);
153 for (i
= 0; i
< str_nums
; i
++)
154 stream
->out
[str_list
[i
]].state
=
157 for (i
= 0; i
< stream
->outcnt
; i
++)
158 stream
->out
[i
].state
= SCTP_STREAM_CLOSED
;
161 asoc
->strreset_chunk
= chunk
;
162 sctp_chunk_hold(asoc
->strreset_chunk
);
164 retval
= sctp_send_reconf(asoc
, chunk
);
166 sctp_chunk_put(asoc
->strreset_chunk
);
167 asoc
->strreset_chunk
= NULL
;
172 for (i
= 0; i
< str_nums
; i
++)
173 stream
->out
[str_list
[i
]].state
=
176 for (i
= 0; i
< stream
->outcnt
; i
++)
177 stream
->out
[i
].state
= SCTP_STREAM_OPEN
;
182 asoc
->strreset_outstanding
= out
+ in
;
188 int sctp_send_reset_assoc(struct sctp_association
*asoc
)
190 struct sctp_chunk
*chunk
= NULL
;
194 if (!asoc
->peer
.reconf_capable
||
195 !(asoc
->strreset_enable
& SCTP_ENABLE_RESET_ASSOC_REQ
))
198 if (asoc
->strreset_outstanding
)
201 chunk
= sctp_make_strreset_tsnreq(asoc
);
205 /* Block further xmit of data until this request is completed */
206 for (i
= 0; i
< asoc
->stream
->outcnt
; i
++)
207 asoc
->stream
->out
[i
].state
= SCTP_STREAM_CLOSED
;
209 asoc
->strreset_chunk
= chunk
;
210 sctp_chunk_hold(asoc
->strreset_chunk
);
212 retval
= sctp_send_reconf(asoc
, chunk
);
214 sctp_chunk_put(asoc
->strreset_chunk
);
215 asoc
->strreset_chunk
= NULL
;
217 for (i
= 0; i
< asoc
->stream
->outcnt
; i
++)
218 asoc
->stream
->out
[i
].state
= SCTP_STREAM_OPEN
;
223 asoc
->strreset_outstanding
= 1;
228 int sctp_send_add_streams(struct sctp_association
*asoc
,
229 struct sctp_add_streams
*params
)
231 struct sctp_stream
*stream
= asoc
->stream
;
232 struct sctp_chunk
*chunk
= NULL
;
233 int retval
= -ENOMEM
;
237 if (!asoc
->peer
.reconf_capable
||
238 !(asoc
->strreset_enable
& SCTP_ENABLE_CHANGE_ASSOC_REQ
)) {
239 retval
= -ENOPROTOOPT
;
243 if (asoc
->strreset_outstanding
) {
244 retval
= -EINPROGRESS
;
248 out
= params
->sas_outstrms
;
249 in
= params
->sas_instrms
;
250 outcnt
= stream
->outcnt
+ out
;
251 incnt
= stream
->incnt
+ in
;
252 if (outcnt
> SCTP_MAX_STREAM
|| incnt
> SCTP_MAX_STREAM
||
259 struct sctp_stream_out
*streamout
;
261 streamout
= krealloc(stream
->out
, outcnt
* sizeof(*streamout
),
266 memset(streamout
+ stream
->outcnt
, 0, out
* sizeof(*streamout
));
267 stream
->out
= streamout
;
271 struct sctp_stream_in
*streamin
;
273 streamin
= krealloc(stream
->in
, incnt
* sizeof(*streamin
),
278 memset(streamin
+ stream
->incnt
, 0, in
* sizeof(*streamin
));
279 stream
->in
= streamin
;
282 chunk
= sctp_make_strreset_addstrm(asoc
, out
, in
);
286 asoc
->strreset_chunk
= chunk
;
287 sctp_chunk_hold(asoc
->strreset_chunk
);
289 retval
= sctp_send_reconf(asoc
, chunk
);
291 sctp_chunk_put(asoc
->strreset_chunk
);
292 asoc
->strreset_chunk
= NULL
;
296 stream
->incnt
= incnt
;
297 stream
->outcnt
= outcnt
;
299 asoc
->strreset_outstanding
= !!out
+ !!in
;
305 static sctp_paramhdr_t
*sctp_chunk_lookup_strreset_param(
306 struct sctp_association
*asoc
, __u32 resp_seq
)
308 struct sctp_chunk
*chunk
= asoc
->strreset_chunk
;
309 struct sctp_reconf_chunk
*hdr
;
310 union sctp_params param
;
312 if (ntohl(resp_seq
) != asoc
->strreset_outseq
|| !chunk
)
315 hdr
= (struct sctp_reconf_chunk
*)chunk
->chunk_hdr
;
316 sctp_walk_params(param
, hdr
, params
) {
317 /* sctp_strreset_tsnreq is actually the basic structure
318 * of all stream reconf params, so it's safe to use it
319 * to access request_seq.
321 struct sctp_strreset_tsnreq
*req
= param
.v
;
323 if (req
->request_seq
== resp_seq
)
330 struct sctp_chunk
*sctp_process_strreset_outreq(
331 struct sctp_association
*asoc
,
332 union sctp_params param
,
333 struct sctp_ulpevent
**evp
)
335 struct sctp_strreset_outreq
*outreq
= param
.v
;
336 struct sctp_stream
*stream
= asoc
->stream
;
337 __u16 i
, nums
, flags
= 0, *str_p
= NULL
;
338 __u32 result
= SCTP_STRRESET_DENIED
;
341 request_seq
= ntohl(outreq
->request_seq
);
343 if (ntohl(outreq
->send_reset_at_tsn
) >
344 sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
)) {
345 result
= SCTP_STRRESET_IN_PROGRESS
;
349 if (request_seq
> asoc
->strreset_inseq
) {
350 result
= SCTP_STRRESET_ERR_BAD_SEQNO
;
352 } else if (request_seq
== asoc
->strreset_inseq
) {
353 asoc
->strreset_inseq
++;
356 /* Check strreset_enable after inseq inc, as sender cannot tell
357 * the peer doesn't enable strreset after receiving response with
358 * result denied, as well as to keep consistent with bsd.
360 if (!(asoc
->strreset_enable
& SCTP_ENABLE_RESET_STREAM_REQ
))
363 if (asoc
->strreset_chunk
) {
364 sctp_paramhdr_t
*param_hdr
;
365 struct sctp_transport
*t
;
367 param_hdr
= sctp_chunk_lookup_strreset_param(
368 asoc
, outreq
->response_seq
);
369 if (!param_hdr
|| param_hdr
->type
!=
370 SCTP_PARAM_RESET_IN_REQUEST
) {
371 /* same process with outstanding isn't 0 */
372 result
= SCTP_STRRESET_ERR_IN_PROGRESS
;
376 asoc
->strreset_outstanding
--;
377 asoc
->strreset_outseq
++;
379 if (!asoc
->strreset_outstanding
) {
380 t
= asoc
->strreset_chunk
->transport
;
381 if (del_timer(&t
->reconf_timer
))
382 sctp_transport_put(t
);
384 sctp_chunk_put(asoc
->strreset_chunk
);
385 asoc
->strreset_chunk
= NULL
;
388 flags
= SCTP_STREAM_RESET_INCOMING_SSN
;
391 nums
= (ntohs(param
.p
->length
) - sizeof(*outreq
)) / 2;
393 str_p
= outreq
->list_of_streams
;
394 for (i
= 0; i
< nums
; i
++) {
395 if (ntohs(str_p
[i
]) >= stream
->incnt
) {
396 result
= SCTP_STRRESET_ERR_WRONG_SSN
;
401 for (i
= 0; i
< nums
; i
++)
402 stream
->in
[ntohs(str_p
[i
])].ssn
= 0;
404 for (i
= 0; i
< stream
->incnt
; i
++)
405 stream
->in
[i
].ssn
= 0;
408 result
= SCTP_STRRESET_PERFORMED
;
410 *evp
= sctp_ulpevent_make_stream_reset_event(asoc
,
411 flags
| SCTP_STREAM_RESET_OUTGOING_SSN
, nums
, str_p
,
415 return sctp_make_strreset_resp(asoc
, result
, request_seq
);
418 struct sctp_chunk
*sctp_process_strreset_inreq(
419 struct sctp_association
*asoc
,
420 union sctp_params param
,
421 struct sctp_ulpevent
**evp
)
423 struct sctp_strreset_inreq
*inreq
= param
.v
;
424 struct sctp_stream
*stream
= asoc
->stream
;
425 __u32 result
= SCTP_STRRESET_DENIED
;
426 struct sctp_chunk
*chunk
= NULL
;
427 __u16 i
, nums
, *str_p
;
430 request_seq
= ntohl(inreq
->request_seq
);
431 if (request_seq
> asoc
->strreset_inseq
) {
432 result
= SCTP_STRRESET_ERR_BAD_SEQNO
;
434 } else if (request_seq
== asoc
->strreset_inseq
) {
435 asoc
->strreset_inseq
++;
438 if (!(asoc
->strreset_enable
& SCTP_ENABLE_RESET_STREAM_REQ
))
441 if (asoc
->strreset_outstanding
) {
442 result
= SCTP_STRRESET_ERR_IN_PROGRESS
;
446 nums
= (ntohs(param
.p
->length
) - sizeof(*inreq
)) / 2;
447 str_p
= inreq
->list_of_streams
;
448 for (i
= 0; i
< nums
; i
++) {
449 if (ntohs(str_p
[i
]) >= stream
->outcnt
) {
450 result
= SCTP_STRRESET_ERR_WRONG_SSN
;
455 chunk
= sctp_make_strreset_req(asoc
, nums
, str_p
, 1, 0);
460 for (i
= 0; i
< nums
; i
++)
461 stream
->out
[ntohs(str_p
[i
])].state
=
464 for (i
= 0; i
< stream
->outcnt
; i
++)
465 stream
->out
[i
].state
= SCTP_STREAM_CLOSED
;
467 asoc
->strreset_chunk
= chunk
;
468 asoc
->strreset_outstanding
= 1;
469 sctp_chunk_hold(asoc
->strreset_chunk
);
471 *evp
= sctp_ulpevent_make_stream_reset_event(asoc
,
472 SCTP_STREAM_RESET_INCOMING_SSN
, nums
, str_p
, GFP_ATOMIC
);
476 chunk
= sctp_make_strreset_resp(asoc
, result
, request_seq
);