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 int sctp_stream_new(struct sctp_association *asoc, gfp_t gfp)
40 struct sctp_stream *stream;
43 stream = kzalloc(sizeof(*stream), gfp);
47 stream->outcnt = asoc->c.sinit_num_ostreams;
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 asoc->stream = stream;
61 int sctp_stream_init(struct sctp_association *asoc, gfp_t gfp)
63 struct sctp_stream *stream = asoc->stream;
66 /* Initial stream->out size may be very big, so free it and alloc
67 * a new one with new outcnt to save memory.
70 stream->outcnt = asoc->c.sinit_num_ostreams;
71 stream->out = kcalloc(stream->outcnt, sizeof(*stream->out), gfp);
75 for (i = 0; i < stream->outcnt; i++)
76 stream->out[i].state = SCTP_STREAM_OPEN;
78 stream->incnt = asoc->c.sinit_max_instreams;
79 stream->in = kcalloc(stream->incnt, sizeof(*stream->in), gfp);
94 void sctp_stream_free(struct sctp_stream *stream)
96 if (unlikely(!stream))
104 void sctp_stream_clear(struct sctp_stream *stream)
108 for (i = 0; i < stream->outcnt; i++)
109 stream->out[i].ssn = 0;
111 for (i = 0; i < stream->incnt; i++)
112 stream->in[i].ssn = 0;
115 static int sctp_send_reconf(struct sctp_association *asoc,
116 struct sctp_chunk *chunk)
118 struct net *net = sock_net(asoc->base.sk);
121 retval = sctp_primitive_RECONF(net, asoc, chunk);
123 sctp_chunk_free(chunk);
128 int sctp_send_reset_streams(struct sctp_association *asoc,
129 struct sctp_reset_streams *params)
131 struct sctp_stream *stream = asoc->stream;
132 __u16 i, str_nums, *str_list;
133 struct sctp_chunk *chunk;
134 int retval = -EINVAL;
137 if (!asoc->peer.reconf_capable ||
138 !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
139 retval = -ENOPROTOOPT;
143 if (asoc->strreset_outstanding) {
144 retval = -EINPROGRESS;
148 out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
149 in = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
153 str_nums = params->srs_number_streams;
154 str_list = params->srs_stream_list;
156 for (i = 0; i < str_nums; i++)
157 if (str_list[i] >= stream->outcnt)
161 for (i = 0; i < str_nums; i++)
162 if (str_list[i] >= stream->incnt)
165 for (i = 0; i < str_nums; i++)
166 str_list[i] = htons(str_list[i]);
168 chunk = sctp_make_strreset_req(asoc, str_nums, str_list, out, in);
170 for (i = 0; i < str_nums; i++)
171 str_list[i] = ntohs(str_list[i]);
180 for (i = 0; i < str_nums; i++)
181 stream->out[str_list[i]].state =
184 for (i = 0; i < stream->outcnt; i++)
185 stream->out[i].state = SCTP_STREAM_CLOSED;
188 asoc->strreset_chunk = chunk;
189 sctp_chunk_hold(asoc->strreset_chunk);
191 retval = sctp_send_reconf(asoc, chunk);
193 sctp_chunk_put(asoc->strreset_chunk);
194 asoc->strreset_chunk = NULL;
199 for (i = 0; i < str_nums; i++)
200 stream->out[str_list[i]].state =
203 for (i = 0; i < stream->outcnt; i++)
204 stream->out[i].state = SCTP_STREAM_OPEN;
209 asoc->strreset_outstanding = out + in;
215 int sctp_send_reset_assoc(struct sctp_association *asoc)
217 struct sctp_chunk *chunk = NULL;
221 if (!asoc->peer.reconf_capable ||
222 !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
225 if (asoc->strreset_outstanding)
228 chunk = sctp_make_strreset_tsnreq(asoc);
232 /* Block further xmit of data until this request is completed */
233 for (i = 0; i < asoc->stream->outcnt; i++)
234 asoc->stream->out[i].state = SCTP_STREAM_CLOSED;
236 asoc->strreset_chunk = chunk;
237 sctp_chunk_hold(asoc->strreset_chunk);
239 retval = sctp_send_reconf(asoc, chunk);
241 sctp_chunk_put(asoc->strreset_chunk);
242 asoc->strreset_chunk = NULL;
244 for (i = 0; i < asoc->stream->outcnt; i++)
245 asoc->stream->out[i].state = SCTP_STREAM_OPEN;
250 asoc->strreset_outstanding = 1;
255 int sctp_send_add_streams(struct sctp_association *asoc,
256 struct sctp_add_streams *params)
258 struct sctp_stream *stream = asoc->stream;
259 struct sctp_chunk *chunk = NULL;
260 int retval = -ENOMEM;
264 if (!asoc->peer.reconf_capable ||
265 !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
266 retval = -ENOPROTOOPT;
270 if (asoc->strreset_outstanding) {
271 retval = -EINPROGRESS;
275 out = params->sas_outstrms;
276 in = params->sas_instrms;
277 outcnt = stream->outcnt + out;
278 incnt = stream->incnt + in;
279 if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
286 struct sctp_stream_out *streamout;
288 streamout = krealloc(stream->out, outcnt * sizeof(*streamout),
293 memset(streamout + stream->outcnt, 0, out * sizeof(*streamout));
294 stream->out = streamout;
298 struct sctp_stream_in *streamin;
300 streamin = krealloc(stream->in, incnt * sizeof(*streamin),
305 memset(streamin + stream->incnt, 0, in * sizeof(*streamin));
306 stream->in = streamin;
309 chunk = sctp_make_strreset_addstrm(asoc, out, in);
313 asoc->strreset_chunk = chunk;
314 sctp_chunk_hold(asoc->strreset_chunk);
316 retval = sctp_send_reconf(asoc, chunk);
318 sctp_chunk_put(asoc->strreset_chunk);
319 asoc->strreset_chunk = NULL;
323 stream->incnt = incnt;
324 stream->outcnt = outcnt;
326 asoc->strreset_outstanding = !!out + !!in;
332 static sctp_paramhdr_t *sctp_chunk_lookup_strreset_param(
333 struct sctp_association *asoc, __u32 resp_seq)
335 struct sctp_chunk *chunk = asoc->strreset_chunk;
336 struct sctp_reconf_chunk *hdr;
337 union sctp_params param;
339 if (ntohl(resp_seq) != asoc->strreset_outseq || !chunk)
342 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
343 sctp_walk_params(param, hdr, params) {
344 /* sctp_strreset_tsnreq is actually the basic structure
345 * of all stream reconf params, so it's safe to use it
346 * to access request_seq.
348 struct sctp_strreset_tsnreq *req = param.v;
350 if (req->request_seq == resp_seq)
357 struct sctp_chunk *sctp_process_strreset_outreq(
358 struct sctp_association *asoc,
359 union sctp_params param,
360 struct sctp_ulpevent **evp)
362 struct sctp_strreset_outreq *outreq = param.v;
363 struct sctp_stream *stream = asoc->stream;
364 __u16 i, nums, flags = 0, *str_p = NULL;
365 __u32 result = SCTP_STRRESET_DENIED;
368 request_seq = ntohl(outreq->request_seq);
370 if (ntohl(outreq->send_reset_at_tsn) >
371 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
372 result = SCTP_STRRESET_IN_PROGRESS;
376 if (request_seq > asoc->strreset_inseq) {
377 result = SCTP_STRRESET_ERR_BAD_SEQNO;
379 } else if (request_seq == asoc->strreset_inseq) {
380 asoc->strreset_inseq++;
383 /* Check strreset_enable after inseq inc, as sender cannot tell
384 * the peer doesn't enable strreset after receiving response with
385 * result denied, as well as to keep consistent with bsd.
387 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
390 if (asoc->strreset_chunk) {
391 sctp_paramhdr_t *param_hdr;
392 struct sctp_transport *t;
394 param_hdr = sctp_chunk_lookup_strreset_param(
395 asoc, outreq->response_seq);
396 if (!param_hdr || param_hdr->type !=
397 SCTP_PARAM_RESET_IN_REQUEST) {
398 /* same process with outstanding isn't 0 */
399 result = SCTP_STRRESET_ERR_IN_PROGRESS;
403 asoc->strreset_outstanding--;
404 asoc->strreset_outseq++;
406 if (!asoc->strreset_outstanding) {
407 t = asoc->strreset_chunk->transport;
408 if (del_timer(&t->reconf_timer))
409 sctp_transport_put(t);
411 sctp_chunk_put(asoc->strreset_chunk);
412 asoc->strreset_chunk = NULL;
415 flags = SCTP_STREAM_RESET_INCOMING_SSN;
418 nums = (ntohs(param.p->length) - sizeof(*outreq)) / 2;
420 str_p = outreq->list_of_streams;
421 for (i = 0; i < nums; i++) {
422 if (ntohs(str_p[i]) >= stream->incnt) {
423 result = SCTP_STRRESET_ERR_WRONG_SSN;
428 for (i = 0; i < nums; i++)
429 stream->in[ntohs(str_p[i])].ssn = 0;
431 for (i = 0; i < stream->incnt; i++)
432 stream->in[i].ssn = 0;
435 result = SCTP_STRRESET_PERFORMED;
437 *evp = sctp_ulpevent_make_stream_reset_event(asoc,
438 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
442 return sctp_make_strreset_resp(asoc, result, request_seq);
445 struct sctp_chunk *sctp_process_strreset_inreq(
446 struct sctp_association *asoc,
447 union sctp_params param,
448 struct sctp_ulpevent **evp)
450 struct sctp_strreset_inreq *inreq = param.v;
451 struct sctp_stream *stream = asoc->stream;
452 __u32 result = SCTP_STRRESET_DENIED;
453 struct sctp_chunk *chunk = NULL;
454 __u16 i, nums, *str_p;
457 request_seq = ntohl(inreq->request_seq);
458 if (request_seq > asoc->strreset_inseq) {
459 result = SCTP_STRRESET_ERR_BAD_SEQNO;
461 } else if (request_seq == asoc->strreset_inseq) {
462 asoc->strreset_inseq++;
465 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
468 if (asoc->strreset_outstanding) {
469 result = SCTP_STRRESET_ERR_IN_PROGRESS;
473 nums = (ntohs(param.p->length) - sizeof(*inreq)) / 2;
474 str_p = inreq->list_of_streams;
475 for (i = 0; i < nums; i++) {
476 if (ntohs(str_p[i]) >= stream->outcnt) {
477 result = SCTP_STRRESET_ERR_WRONG_SSN;
482 chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
487 for (i = 0; i < nums; i++)
488 stream->out[ntohs(str_p[i])].state =
491 for (i = 0; i < stream->outcnt; i++)
492 stream->out[i].state = SCTP_STREAM_CLOSED;
494 asoc->strreset_chunk = chunk;
495 asoc->strreset_outstanding = 1;
496 sctp_chunk_hold(asoc->strreset_chunk);
498 *evp = sctp_ulpevent_make_stream_reset_event(asoc,
499 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
503 chunk = sctp_make_strreset_resp(asoc, result, request_seq);