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![Konstantin Khorenko](/assets/img/avatar_default.png)
This path replaces physically contiguous memory arrays allocated using kmalloc_array() with flexible arrays. This enables to avoid memory allocation failures on the systems under a memory stress. Signed-off-by: Oleg Babin <obabin@virtuozzo.com> Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1158 lines
28 KiB
C
1158 lines
28 KiB
C
/* SCTP kernel implementation
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* (C) Copyright IBM Corp. 2001, 2004
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001 Intel Corp.
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*
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* This file is part of the SCTP kernel implementation
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*
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* This file contains sctp stream maniuplation primitives and helpers.
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Xin Long <lucien.xin@gmail.com>
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*/
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#include <linux/list.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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#include <net/sctp/stream_sched.h>
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static struct flex_array *fa_alloc(size_t elem_size, size_t elem_count,
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gfp_t gfp)
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{
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struct flex_array *result;
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int err;
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result = flex_array_alloc(elem_size, elem_count, gfp);
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if (result) {
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err = flex_array_prealloc(result, 0, elem_count, gfp);
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if (err) {
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flex_array_free(result);
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result = NULL;
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}
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}
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return result;
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}
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static void fa_free(struct flex_array *fa)
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{
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if (fa)
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flex_array_free(fa);
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}
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static void fa_copy(struct flex_array *fa, struct flex_array *from,
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size_t index, size_t count)
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{
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void *elem;
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while (count--) {
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elem = flex_array_get(from, index);
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flex_array_put(fa, index, elem, 0);
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index++;
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}
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}
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static void fa_zero(struct flex_array *fa, size_t index, size_t count)
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{
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void *elem;
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while (count--) {
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elem = flex_array_get(fa, index);
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memset(elem, 0, fa->element_size);
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index++;
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}
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}
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/* Migrates chunks from stream queues to new stream queues if needed,
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* but not across associations. Also, removes those chunks to streams
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* higher than the new max.
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*/
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static void sctp_stream_outq_migrate(struct sctp_stream *stream,
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struct sctp_stream *new, __u16 outcnt)
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{
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struct sctp_association *asoc;
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struct sctp_chunk *ch, *temp;
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struct sctp_outq *outq;
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int i;
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asoc = container_of(stream, struct sctp_association, stream);
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outq = &asoc->outqueue;
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list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) {
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__u16 sid = sctp_chunk_stream_no(ch);
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if (sid < outcnt)
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continue;
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sctp_sched_dequeue_common(outq, ch);
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/* No need to call dequeue_done here because
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* the chunks are not scheduled by now.
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*/
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/* Mark as failed send. */
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sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM);
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if (asoc->peer.prsctp_capable &&
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SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
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asoc->sent_cnt_removable--;
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sctp_chunk_free(ch);
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}
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if (new) {
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/* Here we actually move the old ext stuff into the new
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* buffer, because we want to keep it. Then
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* sctp_stream_update will swap ->out pointers.
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*/
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for (i = 0; i < outcnt; i++) {
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kfree(SCTP_SO(new, i)->ext);
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SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext;
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SCTP_SO(stream, i)->ext = NULL;
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}
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}
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for (i = outcnt; i < stream->outcnt; i++)
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kfree(SCTP_SO(stream, i)->ext);
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}
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static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
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gfp_t gfp)
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{
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struct flex_array *out;
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size_t elem_size = sizeof(struct sctp_stream_out);
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out = fa_alloc(elem_size, outcnt, gfp);
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if (!out)
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return -ENOMEM;
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if (stream->out) {
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fa_copy(out, stream->out, 0, min(outcnt, stream->outcnt));
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fa_free(stream->out);
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}
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if (outcnt > stream->outcnt)
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fa_zero(out, stream->outcnt, (outcnt - stream->outcnt));
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stream->out = out;
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return 0;
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}
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static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
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gfp_t gfp)
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{
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struct flex_array *in;
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size_t elem_size = sizeof(struct sctp_stream_in);
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in = fa_alloc(elem_size, incnt, gfp);
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if (!in)
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return -ENOMEM;
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if (stream->in) {
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fa_copy(in, stream->in, 0, min(incnt, stream->incnt));
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fa_free(stream->in);
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}
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if (incnt > stream->incnt)
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fa_zero(in, stream->incnt, (incnt - stream->incnt));
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stream->in = in;
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return 0;
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}
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int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
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gfp_t gfp)
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{
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struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
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int i, ret = 0;
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gfp |= __GFP_NOWARN;
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/* Initial stream->out size may be very big, so free it and alloc
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* a new one with new outcnt to save memory if needed.
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*/
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if (outcnt == stream->outcnt)
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goto in;
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/* Filter out chunks queued on streams that won't exist anymore */
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sched->unsched_all(stream);
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sctp_stream_outq_migrate(stream, NULL, outcnt);
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sched->sched_all(stream);
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ret = sctp_stream_alloc_out(stream, outcnt, gfp);
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if (ret)
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goto out;
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stream->outcnt = outcnt;
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for (i = 0; i < stream->outcnt; i++)
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SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
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sched->init(stream);
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in:
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sctp_stream_interleave_init(stream);
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if (!incnt)
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goto out;
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ret = sctp_stream_alloc_in(stream, incnt, gfp);
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if (ret) {
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sched->free(stream);
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fa_free(stream->out);
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stream->out = NULL;
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stream->outcnt = 0;
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goto out;
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}
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stream->incnt = incnt;
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out:
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return ret;
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}
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int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
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{
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struct sctp_stream_out_ext *soute;
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soute = kzalloc(sizeof(*soute), GFP_KERNEL);
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if (!soute)
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return -ENOMEM;
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SCTP_SO(stream, sid)->ext = soute;
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return sctp_sched_init_sid(stream, sid, GFP_KERNEL);
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}
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void sctp_stream_free(struct sctp_stream *stream)
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{
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struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
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int i;
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sched->free(stream);
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for (i = 0; i < stream->outcnt; i++)
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kfree(SCTP_SO(stream, i)->ext);
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fa_free(stream->out);
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fa_free(stream->in);
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}
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void sctp_stream_clear(struct sctp_stream *stream)
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{
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int i;
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for (i = 0; i < stream->outcnt; i++) {
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SCTP_SO(stream, i)->mid = 0;
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SCTP_SO(stream, i)->mid_uo = 0;
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}
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for (i = 0; i < stream->incnt; i++)
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SCTP_SI(stream, i)->mid = 0;
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}
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void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
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{
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struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
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sched->unsched_all(stream);
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sctp_stream_outq_migrate(stream, new, new->outcnt);
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sctp_stream_free(stream);
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stream->out = new->out;
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stream->in = new->in;
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stream->outcnt = new->outcnt;
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stream->incnt = new->incnt;
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sched->sched_all(stream);
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new->out = NULL;
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new->in = NULL;
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new->outcnt = 0;
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new->incnt = 0;
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}
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static int sctp_send_reconf(struct sctp_association *asoc,
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struct sctp_chunk *chunk)
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{
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struct net *net = sock_net(asoc->base.sk);
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int retval = 0;
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retval = sctp_primitive_RECONF(net, asoc, chunk);
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if (retval)
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sctp_chunk_free(chunk);
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return retval;
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}
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static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
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__u16 str_nums, __be16 *str_list)
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{
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struct sctp_association *asoc;
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__u16 i;
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asoc = container_of(stream, struct sctp_association, stream);
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if (!asoc->outqueue.out_qlen)
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return true;
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if (!str_nums)
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return false;
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for (i = 0; i < str_nums; i++) {
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__u16 sid = ntohs(str_list[i]);
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if (SCTP_SO(stream, sid)->ext &&
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!list_empty(&SCTP_SO(stream, sid)->ext->outq))
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return false;
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}
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return true;
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}
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int sctp_send_reset_streams(struct sctp_association *asoc,
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struct sctp_reset_streams *params)
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{
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struct sctp_stream *stream = &asoc->stream;
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__u16 i, str_nums, *str_list;
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struct sctp_chunk *chunk;
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int retval = -EINVAL;
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__be16 *nstr_list;
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bool out, in;
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if (!asoc->peer.reconf_capable ||
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!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
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retval = -ENOPROTOOPT;
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goto out;
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}
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if (asoc->strreset_outstanding) {
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retval = -EINPROGRESS;
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goto out;
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}
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out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
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in = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
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if (!out && !in)
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goto out;
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str_nums = params->srs_number_streams;
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str_list = params->srs_stream_list;
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if (str_nums) {
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int param_len = 0;
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if (out) {
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for (i = 0; i < str_nums; i++)
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if (str_list[i] >= stream->outcnt)
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goto out;
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param_len = str_nums * sizeof(__u16) +
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sizeof(struct sctp_strreset_outreq);
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}
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if (in) {
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for (i = 0; i < str_nums; i++)
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if (str_list[i] >= stream->incnt)
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goto out;
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param_len += str_nums * sizeof(__u16) +
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sizeof(struct sctp_strreset_inreq);
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}
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if (param_len > SCTP_MAX_CHUNK_LEN -
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sizeof(struct sctp_reconf_chunk))
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goto out;
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}
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nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
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if (!nstr_list) {
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retval = -ENOMEM;
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goto out;
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}
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for (i = 0; i < str_nums; i++)
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nstr_list[i] = htons(str_list[i]);
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if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
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retval = -EAGAIN;
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goto out;
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}
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chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
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kfree(nstr_list);
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if (!chunk) {
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retval = -ENOMEM;
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goto out;
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}
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if (out) {
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if (str_nums)
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for (i = 0; i < str_nums; i++)
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SCTP_SO(stream, str_list[i])->state =
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SCTP_STREAM_CLOSED;
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else
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for (i = 0; i < stream->outcnt; i++)
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SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
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}
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asoc->strreset_chunk = chunk;
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sctp_chunk_hold(asoc->strreset_chunk);
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retval = sctp_send_reconf(asoc, chunk);
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if (retval) {
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sctp_chunk_put(asoc->strreset_chunk);
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asoc->strreset_chunk = NULL;
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if (!out)
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goto out;
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if (str_nums)
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for (i = 0; i < str_nums; i++)
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SCTP_SO(stream, str_list[i])->state =
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SCTP_STREAM_OPEN;
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else
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for (i = 0; i < stream->outcnt; i++)
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SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
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|
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goto out;
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}
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|
|
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asoc->strreset_outstanding = out + in;
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|
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out:
|
|
return retval;
|
|
}
|
|
|
|
int sctp_send_reset_assoc(struct sctp_association *asoc)
|
|
{
|
|
struct sctp_stream *stream = &asoc->stream;
|
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struct sctp_chunk *chunk = NULL;
|
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int retval;
|
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__u16 i;
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|
|
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if (!asoc->peer.reconf_capable ||
|
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!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
|
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return -ENOPROTOOPT;
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|
|
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if (asoc->strreset_outstanding)
|
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return -EINPROGRESS;
|
|
|
|
if (!sctp_outq_is_empty(&asoc->outqueue))
|
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return -EAGAIN;
|
|
|
|
chunk = sctp_make_strreset_tsnreq(asoc);
|
|
if (!chunk)
|
|
return -ENOMEM;
|
|
|
|
/* Block further xmit of data until this request is completed */
|
|
for (i = 0; i < stream->outcnt; i++)
|
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SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
|
|
|
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asoc->strreset_chunk = chunk;
|
|
sctp_chunk_hold(asoc->strreset_chunk);
|
|
|
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retval = sctp_send_reconf(asoc, chunk);
|
|
if (retval) {
|
|
sctp_chunk_put(asoc->strreset_chunk);
|
|
asoc->strreset_chunk = NULL;
|
|
|
|
for (i = 0; i < stream->outcnt; i++)
|
|
SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
|
|
|
|
return retval;
|
|
}
|
|
|
|
asoc->strreset_outstanding = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sctp_send_add_streams(struct sctp_association *asoc,
|
|
struct sctp_add_streams *params)
|
|
{
|
|
struct sctp_stream *stream = &asoc->stream;
|
|
struct sctp_chunk *chunk = NULL;
|
|
int retval;
|
|
__u32 outcnt, incnt;
|
|
__u16 out, in;
|
|
|
|
if (!asoc->peer.reconf_capable ||
|
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!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
|
|
retval = -ENOPROTOOPT;
|
|
goto out;
|
|
}
|
|
|
|
if (asoc->strreset_outstanding) {
|
|
retval = -EINPROGRESS;
|
|
goto out;
|
|
}
|
|
|
|
out = params->sas_outstrms;
|
|
in = params->sas_instrms;
|
|
outcnt = stream->outcnt + out;
|
|
incnt = stream->incnt + in;
|
|
if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
|
|
(!out && !in)) {
|
|
retval = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (out) {
|
|
retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
|
|
if (retval)
|
|
goto out;
|
|
}
|
|
|
|
chunk = sctp_make_strreset_addstrm(asoc, out, in);
|
|
if (!chunk) {
|
|
retval = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
asoc->strreset_chunk = chunk;
|
|
sctp_chunk_hold(asoc->strreset_chunk);
|
|
|
|
retval = sctp_send_reconf(asoc, chunk);
|
|
if (retval) {
|
|
sctp_chunk_put(asoc->strreset_chunk);
|
|
asoc->strreset_chunk = NULL;
|
|
goto out;
|
|
}
|
|
|
|
stream->incnt = incnt;
|
|
stream->outcnt = outcnt;
|
|
|
|
asoc->strreset_outstanding = !!out + !!in;
|
|
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
|
|
struct sctp_association *asoc, __be32 resp_seq,
|
|
__be16 type)
|
|
{
|
|
struct sctp_chunk *chunk = asoc->strreset_chunk;
|
|
struct sctp_reconf_chunk *hdr;
|
|
union sctp_params param;
|
|
|
|
if (!chunk)
|
|
return NULL;
|
|
|
|
hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
|
|
sctp_walk_params(param, hdr, params) {
|
|
/* sctp_strreset_tsnreq is actually the basic structure
|
|
* of all stream reconf params, so it's safe to use it
|
|
* to access request_seq.
|
|
*/
|
|
struct sctp_strreset_tsnreq *req = param.v;
|
|
|
|
if ((!resp_seq || req->request_seq == resp_seq) &&
|
|
(!type || type == req->param_hdr.type))
|
|
return param.v;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void sctp_update_strreset_result(struct sctp_association *asoc,
|
|
__u32 result)
|
|
{
|
|
asoc->strreset_result[1] = asoc->strreset_result[0];
|
|
asoc->strreset_result[0] = result;
|
|
}
|
|
|
|
struct sctp_chunk *sctp_process_strreset_outreq(
|
|
struct sctp_association *asoc,
|
|
union sctp_params param,
|
|
struct sctp_ulpevent **evp)
|
|
{
|
|
struct sctp_strreset_outreq *outreq = param.v;
|
|
struct sctp_stream *stream = &asoc->stream;
|
|
__u32 result = SCTP_STRRESET_DENIED;
|
|
__u16 i, nums, flags = 0;
|
|
__be16 *str_p = NULL;
|
|
__u32 request_seq;
|
|
|
|
request_seq = ntohl(outreq->request_seq);
|
|
|
|
if (ntohl(outreq->send_reset_at_tsn) >
|
|
sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
|
|
result = SCTP_STRRESET_IN_PROGRESS;
|
|
goto err;
|
|
}
|
|
|
|
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
|
|
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
|
|
result = SCTP_STRRESET_ERR_BAD_SEQNO;
|
|
goto err;
|
|
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
|
|
i = asoc->strreset_inseq - request_seq - 1;
|
|
result = asoc->strreset_result[i];
|
|
goto err;
|
|
}
|
|
asoc->strreset_inseq++;
|
|
|
|
/* Check strreset_enable after inseq inc, as sender cannot tell
|
|
* the peer doesn't enable strreset after receiving response with
|
|
* result denied, as well as to keep consistent with bsd.
|
|
*/
|
|
if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
|
|
goto out;
|
|
|
|
if (asoc->strreset_chunk) {
|
|
if (!sctp_chunk_lookup_strreset_param(
|
|
asoc, outreq->response_seq,
|
|
SCTP_PARAM_RESET_IN_REQUEST)) {
|
|
/* same process with outstanding isn't 0 */
|
|
result = SCTP_STRRESET_ERR_IN_PROGRESS;
|
|
goto out;
|
|
}
|
|
|
|
asoc->strreset_outstanding--;
|
|
asoc->strreset_outseq++;
|
|
|
|
if (!asoc->strreset_outstanding) {
|
|
struct sctp_transport *t;
|
|
|
|
t = asoc->strreset_chunk->transport;
|
|
if (del_timer(&t->reconf_timer))
|
|
sctp_transport_put(t);
|
|
|
|
sctp_chunk_put(asoc->strreset_chunk);
|
|
asoc->strreset_chunk = NULL;
|
|
}
|
|
|
|
flags = SCTP_STREAM_RESET_INCOMING_SSN;
|
|
}
|
|
|
|
nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
|
|
if (nums) {
|
|
str_p = outreq->list_of_streams;
|
|
for (i = 0; i < nums; i++) {
|
|
if (ntohs(str_p[i]) >= stream->incnt) {
|
|
result = SCTP_STRRESET_ERR_WRONG_SSN;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < nums; i++)
|
|
SCTP_SI(stream, ntohs(str_p[i]))->mid = 0;
|
|
} else {
|
|
for (i = 0; i < stream->incnt; i++)
|
|
SCTP_SI(stream, i)->mid = 0;
|
|
}
|
|
|
|
result = SCTP_STRRESET_PERFORMED;
|
|
|
|
*evp = sctp_ulpevent_make_stream_reset_event(asoc,
|
|
flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
|
|
GFP_ATOMIC);
|
|
|
|
out:
|
|
sctp_update_strreset_result(asoc, result);
|
|
err:
|
|
return sctp_make_strreset_resp(asoc, result, request_seq);
|
|
}
|
|
|
|
struct sctp_chunk *sctp_process_strreset_inreq(
|
|
struct sctp_association *asoc,
|
|
union sctp_params param,
|
|
struct sctp_ulpevent **evp)
|
|
{
|
|
struct sctp_strreset_inreq *inreq = param.v;
|
|
struct sctp_stream *stream = &asoc->stream;
|
|
__u32 result = SCTP_STRRESET_DENIED;
|
|
struct sctp_chunk *chunk = NULL;
|
|
__u32 request_seq;
|
|
__u16 i, nums;
|
|
__be16 *str_p;
|
|
|
|
request_seq = ntohl(inreq->request_seq);
|
|
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
|
|
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
|
|
result = SCTP_STRRESET_ERR_BAD_SEQNO;
|
|
goto err;
|
|
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
|
|
i = asoc->strreset_inseq - request_seq - 1;
|
|
result = asoc->strreset_result[i];
|
|
if (result == SCTP_STRRESET_PERFORMED)
|
|
return NULL;
|
|
goto err;
|
|
}
|
|
asoc->strreset_inseq++;
|
|
|
|
if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
|
|
goto out;
|
|
|
|
if (asoc->strreset_outstanding) {
|
|
result = SCTP_STRRESET_ERR_IN_PROGRESS;
|
|
goto out;
|
|
}
|
|
|
|
nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
|
|
str_p = inreq->list_of_streams;
|
|
for (i = 0; i < nums; i++) {
|
|
if (ntohs(str_p[i]) >= stream->outcnt) {
|
|
result = SCTP_STRRESET_ERR_WRONG_SSN;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
|
|
result = SCTP_STRRESET_IN_PROGRESS;
|
|
asoc->strreset_inseq--;
|
|
goto err;
|
|
}
|
|
|
|
chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
|
|
if (!chunk)
|
|
goto out;
|
|
|
|
if (nums)
|
|
for (i = 0; i < nums; i++)
|
|
SCTP_SO(stream, ntohs(str_p[i]))->state =
|
|
SCTP_STREAM_CLOSED;
|
|
else
|
|
for (i = 0; i < stream->outcnt; i++)
|
|
SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
|
|
|
|
asoc->strreset_chunk = chunk;
|
|
asoc->strreset_outstanding = 1;
|
|
sctp_chunk_hold(asoc->strreset_chunk);
|
|
|
|
result = SCTP_STRRESET_PERFORMED;
|
|
|
|
*evp = sctp_ulpevent_make_stream_reset_event(asoc,
|
|
SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
|
|
|
|
out:
|
|
sctp_update_strreset_result(asoc, result);
|
|
err:
|
|
if (!chunk)
|
|
chunk = sctp_make_strreset_resp(asoc, result, request_seq);
|
|
|
|
return chunk;
|
|
}
|
|
|
|
struct sctp_chunk *sctp_process_strreset_tsnreq(
|
|
struct sctp_association *asoc,
|
|
union sctp_params param,
|
|
struct sctp_ulpevent **evp)
|
|
{
|
|
__u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
|
|
struct sctp_strreset_tsnreq *tsnreq = param.v;
|
|
struct sctp_stream *stream = &asoc->stream;
|
|
__u32 result = SCTP_STRRESET_DENIED;
|
|
__u32 request_seq;
|
|
__u16 i;
|
|
|
|
request_seq = ntohl(tsnreq->request_seq);
|
|
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
|
|
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
|
|
result = SCTP_STRRESET_ERR_BAD_SEQNO;
|
|
goto err;
|
|
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
|
|
i = asoc->strreset_inseq - request_seq - 1;
|
|
result = asoc->strreset_result[i];
|
|
if (result == SCTP_STRRESET_PERFORMED) {
|
|
next_tsn = asoc->ctsn_ack_point + 1;
|
|
init_tsn =
|
|
sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
|
|
}
|
|
goto err;
|
|
}
|
|
|
|
if (!sctp_outq_is_empty(&asoc->outqueue)) {
|
|
result = SCTP_STRRESET_IN_PROGRESS;
|
|
goto err;
|
|
}
|
|
|
|
asoc->strreset_inseq++;
|
|
|
|
if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
|
|
goto out;
|
|
|
|
if (asoc->strreset_outstanding) {
|
|
result = SCTP_STRRESET_ERR_IN_PROGRESS;
|
|
goto out;
|
|
}
|
|
|
|
/* G4: The same processing as though a FWD-TSN chunk (as defined in
|
|
* [RFC3758]) with all streams affected and a new cumulative TSN
|
|
* ACK of the Receiver's Next TSN minus 1 were received MUST be
|
|
* performed.
|
|
*/
|
|
max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
|
|
asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen);
|
|
|
|
/* G1: Compute an appropriate value for the Receiver's Next TSN -- the
|
|
* TSN that the peer should use to send the next DATA chunk. The
|
|
* value SHOULD be the smallest TSN not acknowledged by the
|
|
* receiver of the request plus 2^31.
|
|
*/
|
|
init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
|
|
sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
|
|
init_tsn, GFP_ATOMIC);
|
|
|
|
/* G3: The same processing as though a SACK chunk with no gap report
|
|
* and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
|
|
* received MUST be performed.
|
|
*/
|
|
sctp_outq_free(&asoc->outqueue);
|
|
|
|
/* G2: Compute an appropriate value for the local endpoint's next TSN,
|
|
* i.e., the next TSN assigned by the receiver of the SSN/TSN reset
|
|
* chunk. The value SHOULD be the highest TSN sent by the receiver
|
|
* of the request plus 1.
|
|
*/
|
|
next_tsn = asoc->next_tsn;
|
|
asoc->ctsn_ack_point = next_tsn - 1;
|
|
asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
|
|
|
|
/* G5: The next expected and outgoing SSNs MUST be reset to 0 for all
|
|
* incoming and outgoing streams.
|
|
*/
|
|
for (i = 0; i < stream->outcnt; i++) {
|
|
SCTP_SO(stream, i)->mid = 0;
|
|
SCTP_SO(stream, i)->mid_uo = 0;
|
|
}
|
|
for (i = 0; i < stream->incnt; i++)
|
|
SCTP_SI(stream, i)->mid = 0;
|
|
|
|
result = SCTP_STRRESET_PERFORMED;
|
|
|
|
*evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
|
|
next_tsn, GFP_ATOMIC);
|
|
|
|
out:
|
|
sctp_update_strreset_result(asoc, result);
|
|
err:
|
|
return sctp_make_strreset_tsnresp(asoc, result, request_seq,
|
|
next_tsn, init_tsn);
|
|
}
|
|
|
|
struct sctp_chunk *sctp_process_strreset_addstrm_out(
|
|
struct sctp_association *asoc,
|
|
union sctp_params param,
|
|
struct sctp_ulpevent **evp)
|
|
{
|
|
struct sctp_strreset_addstrm *addstrm = param.v;
|
|
struct sctp_stream *stream = &asoc->stream;
|
|
__u32 result = SCTP_STRRESET_DENIED;
|
|
__u32 request_seq, incnt;
|
|
__u16 in, i;
|
|
|
|
request_seq = ntohl(addstrm->request_seq);
|
|
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
|
|
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
|
|
result = SCTP_STRRESET_ERR_BAD_SEQNO;
|
|
goto err;
|
|
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
|
|
i = asoc->strreset_inseq - request_seq - 1;
|
|
result = asoc->strreset_result[i];
|
|
goto err;
|
|
}
|
|
asoc->strreset_inseq++;
|
|
|
|
if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
|
|
goto out;
|
|
|
|
if (asoc->strreset_chunk) {
|
|
if (!sctp_chunk_lookup_strreset_param(
|
|
asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
|
|
/* same process with outstanding isn't 0 */
|
|
result = SCTP_STRRESET_ERR_IN_PROGRESS;
|
|
goto out;
|
|
}
|
|
|
|
asoc->strreset_outstanding--;
|
|
asoc->strreset_outseq++;
|
|
|
|
if (!asoc->strreset_outstanding) {
|
|
struct sctp_transport *t;
|
|
|
|
t = asoc->strreset_chunk->transport;
|
|
if (del_timer(&t->reconf_timer))
|
|
sctp_transport_put(t);
|
|
|
|
sctp_chunk_put(asoc->strreset_chunk);
|
|
asoc->strreset_chunk = NULL;
|
|
}
|
|
}
|
|
|
|
in = ntohs(addstrm->number_of_streams);
|
|
incnt = stream->incnt + in;
|
|
if (!in || incnt > SCTP_MAX_STREAM)
|
|
goto out;
|
|
|
|
if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
|
|
goto out;
|
|
|
|
stream->incnt = incnt;
|
|
|
|
result = SCTP_STRRESET_PERFORMED;
|
|
|
|
*evp = sctp_ulpevent_make_stream_change_event(asoc,
|
|
0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
|
|
|
|
out:
|
|
sctp_update_strreset_result(asoc, result);
|
|
err:
|
|
return sctp_make_strreset_resp(asoc, result, request_seq);
|
|
}
|
|
|
|
struct sctp_chunk *sctp_process_strreset_addstrm_in(
|
|
struct sctp_association *asoc,
|
|
union sctp_params param,
|
|
struct sctp_ulpevent **evp)
|
|
{
|
|
struct sctp_strreset_addstrm *addstrm = param.v;
|
|
struct sctp_stream *stream = &asoc->stream;
|
|
__u32 result = SCTP_STRRESET_DENIED;
|
|
struct sctp_chunk *chunk = NULL;
|
|
__u32 request_seq, outcnt;
|
|
__u16 out, i;
|
|
int ret;
|
|
|
|
request_seq = ntohl(addstrm->request_seq);
|
|
if (TSN_lt(asoc->strreset_inseq, request_seq) ||
|
|
TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
|
|
result = SCTP_STRRESET_ERR_BAD_SEQNO;
|
|
goto err;
|
|
} else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
|
|
i = asoc->strreset_inseq - request_seq - 1;
|
|
result = asoc->strreset_result[i];
|
|
if (result == SCTP_STRRESET_PERFORMED)
|
|
return NULL;
|
|
goto err;
|
|
}
|
|
asoc->strreset_inseq++;
|
|
|
|
if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
|
|
goto out;
|
|
|
|
if (asoc->strreset_outstanding) {
|
|
result = SCTP_STRRESET_ERR_IN_PROGRESS;
|
|
goto out;
|
|
}
|
|
|
|
out = ntohs(addstrm->number_of_streams);
|
|
outcnt = stream->outcnt + out;
|
|
if (!out || outcnt > SCTP_MAX_STREAM)
|
|
goto out;
|
|
|
|
ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
|
|
if (ret)
|
|
goto out;
|
|
|
|
chunk = sctp_make_strreset_addstrm(asoc, out, 0);
|
|
if (!chunk)
|
|
goto out;
|
|
|
|
asoc->strreset_chunk = chunk;
|
|
asoc->strreset_outstanding = 1;
|
|
sctp_chunk_hold(asoc->strreset_chunk);
|
|
|
|
stream->outcnt = outcnt;
|
|
|
|
result = SCTP_STRRESET_PERFORMED;
|
|
|
|
*evp = sctp_ulpevent_make_stream_change_event(asoc,
|
|
0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
|
|
|
|
out:
|
|
sctp_update_strreset_result(asoc, result);
|
|
err:
|
|
if (!chunk)
|
|
chunk = sctp_make_strreset_resp(asoc, result, request_seq);
|
|
|
|
return chunk;
|
|
}
|
|
|
|
struct sctp_chunk *sctp_process_strreset_resp(
|
|
struct sctp_association *asoc,
|
|
union sctp_params param,
|
|
struct sctp_ulpevent **evp)
|
|
{
|
|
struct sctp_stream *stream = &asoc->stream;
|
|
struct sctp_strreset_resp *resp = param.v;
|
|
struct sctp_transport *t;
|
|
__u16 i, nums, flags = 0;
|
|
struct sctp_paramhdr *req;
|
|
__u32 result;
|
|
|
|
req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
|
|
if (!req)
|
|
return NULL;
|
|
|
|
result = ntohl(resp->result);
|
|
if (result != SCTP_STRRESET_PERFORMED) {
|
|
/* if in progress, do nothing but retransmit */
|
|
if (result == SCTP_STRRESET_IN_PROGRESS)
|
|
return NULL;
|
|
else if (result == SCTP_STRRESET_DENIED)
|
|
flags = SCTP_STREAM_RESET_DENIED;
|
|
else
|
|
flags = SCTP_STREAM_RESET_FAILED;
|
|
}
|
|
|
|
if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
|
|
struct sctp_strreset_outreq *outreq;
|
|
__be16 *str_p;
|
|
|
|
outreq = (struct sctp_strreset_outreq *)req;
|
|
str_p = outreq->list_of_streams;
|
|
nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
|
|
sizeof(__u16);
|
|
|
|
if (result == SCTP_STRRESET_PERFORMED) {
|
|
struct sctp_stream_out *sout;
|
|
if (nums) {
|
|
for (i = 0; i < nums; i++) {
|
|
sout = SCTP_SO(stream, ntohs(str_p[i]));
|
|
sout->mid = 0;
|
|
sout->mid_uo = 0;
|
|
}
|
|
} else {
|
|
for (i = 0; i < stream->outcnt; i++) {
|
|
sout = SCTP_SO(stream, i);
|
|
sout->mid = 0;
|
|
sout->mid_uo = 0;
|
|
}
|
|
}
|
|
|
|
flags = SCTP_STREAM_RESET_OUTGOING_SSN;
|
|
}
|
|
|
|
for (i = 0; i < stream->outcnt; i++)
|
|
SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
|
|
|
|
*evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
|
|
nums, str_p, GFP_ATOMIC);
|
|
} else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
|
|
struct sctp_strreset_inreq *inreq;
|
|
__be16 *str_p;
|
|
|
|
/* if the result is performed, it's impossible for inreq */
|
|
if (result == SCTP_STRRESET_PERFORMED)
|
|
return NULL;
|
|
|
|
inreq = (struct sctp_strreset_inreq *)req;
|
|
str_p = inreq->list_of_streams;
|
|
nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
|
|
sizeof(__u16);
|
|
|
|
*evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
|
|
nums, str_p, GFP_ATOMIC);
|
|
} else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
|
|
struct sctp_strreset_resptsn *resptsn;
|
|
__u32 stsn, rtsn;
|
|
|
|
/* check for resptsn, as sctp_verify_reconf didn't do it*/
|
|
if (ntohs(param.p->length) != sizeof(*resptsn))
|
|
return NULL;
|
|
|
|
resptsn = (struct sctp_strreset_resptsn *)resp;
|
|
stsn = ntohl(resptsn->senders_next_tsn);
|
|
rtsn = ntohl(resptsn->receivers_next_tsn);
|
|
|
|
if (result == SCTP_STRRESET_PERFORMED) {
|
|
__u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
|
|
&asoc->peer.tsn_map);
|
|
LIST_HEAD(temp);
|
|
|
|
asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
|
|
|
|
sctp_tsnmap_init(&asoc->peer.tsn_map,
|
|
SCTP_TSN_MAP_INITIAL,
|
|
stsn, GFP_ATOMIC);
|
|
|
|
/* Clean up sacked and abandoned queues only. As the
|
|
* out_chunk_list may not be empty, splice it to temp,
|
|
* then get it back after sctp_outq_free is done.
|
|
*/
|
|
list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
|
|
sctp_outq_free(&asoc->outqueue);
|
|
list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
|
|
|
|
asoc->next_tsn = rtsn;
|
|
asoc->ctsn_ack_point = asoc->next_tsn - 1;
|
|
asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
|
|
|
|
for (i = 0; i < stream->outcnt; i++) {
|
|
SCTP_SO(stream, i)->mid = 0;
|
|
SCTP_SO(stream, i)->mid_uo = 0;
|
|
}
|
|
for (i = 0; i < stream->incnt; i++)
|
|
SCTP_SI(stream, i)->mid = 0;
|
|
}
|
|
|
|
for (i = 0; i < stream->outcnt; i++)
|
|
SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
|
|
|
|
*evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
|
|
stsn, rtsn, GFP_ATOMIC);
|
|
} else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
|
|
struct sctp_strreset_addstrm *addstrm;
|
|
__u16 number;
|
|
|
|
addstrm = (struct sctp_strreset_addstrm *)req;
|
|
nums = ntohs(addstrm->number_of_streams);
|
|
number = stream->outcnt - nums;
|
|
|
|
if (result == SCTP_STRRESET_PERFORMED)
|
|
for (i = number; i < stream->outcnt; i++)
|
|
SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
|
|
else
|
|
stream->outcnt = number;
|
|
|
|
*evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
|
|
0, nums, GFP_ATOMIC);
|
|
} else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
|
|
struct sctp_strreset_addstrm *addstrm;
|
|
|
|
/* if the result is performed, it's impossible for addstrm in
|
|
* request.
|
|
*/
|
|
if (result == SCTP_STRRESET_PERFORMED)
|
|
return NULL;
|
|
|
|
addstrm = (struct sctp_strreset_addstrm *)req;
|
|
nums = ntohs(addstrm->number_of_streams);
|
|
|
|
*evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
|
|
nums, 0, GFP_ATOMIC);
|
|
}
|
|
|
|
asoc->strreset_outstanding--;
|
|
asoc->strreset_outseq++;
|
|
|
|
/* remove everything for this reconf request */
|
|
if (!asoc->strreset_outstanding) {
|
|
t = asoc->strreset_chunk->transport;
|
|
if (del_timer(&t->reconf_timer))
|
|
sctp_transport_put(t);
|
|
|
|
sctp_chunk_put(asoc->strreset_chunk);
|
|
asoc->strreset_chunk = NULL;
|
|
}
|
|
|
|
return NULL;
|
|
}
|