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1089 lines
26 KiB
1089 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* SCTP kernel implementation |
|
* (C) Copyright IBM Corp. 2001, 2004 |
|
* 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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* Please send any bug reports or fixes you make to the |
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* email address(es): |
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* lksctp developers <[email protected]> |
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* |
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* Written or modified by: |
|
* Xin Long <[email protected]> |
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*/ |
|
|
|
#include <linux/list.h> |
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#include <net/sctp/sctp.h> |
|
#include <net/sctp/sm.h> |
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#include <net/sctp/stream_sched.h> |
|
|
|
static void sctp_stream_shrink_out(struct sctp_stream *stream, __u16 outcnt) |
|
{ |
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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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|
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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); |
|
|
|
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. |
|
*/ |
|
|
|
/* 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 && |
|
SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags)) |
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asoc->sent_cnt_removable--; |
|
|
|
sctp_chunk_free(ch); |
|
} |
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} |
|
|
|
/* Migrates chunks from stream queues to new stream queues if needed, |
|
* but not across associations. Also, removes those chunks to streams |
|
* higher than the new max. |
|
*/ |
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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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int i; |
|
|
|
if (stream->outcnt > outcnt) |
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sctp_stream_shrink_out(stream, outcnt); |
|
|
|
if (new) { |
|
/* Here we actually move the old ext stuff into the new |
|
* buffer, because we want to keep it. Then |
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* sctp_stream_update will swap ->out pointers. |
|
*/ |
|
for (i = 0; i < outcnt; i++) { |
|
kfree(SCTP_SO(new, i)->ext); |
|
SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext; |
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SCTP_SO(stream, i)->ext = NULL; |
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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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SCTP_SO(stream, i)->ext = NULL; |
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} |
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} |
|
|
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static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt, |
|
gfp_t gfp) |
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{ |
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int ret; |
|
|
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if (outcnt <= stream->outcnt) |
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goto out; |
|
|
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ret = genradix_prealloc(&stream->out, outcnt, gfp); |
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if (ret) |
|
return ret; |
|
|
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out: |
|
stream->outcnt = outcnt; |
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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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int ret; |
|
|
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if (incnt <= stream->incnt) |
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goto out; |
|
|
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ret = genradix_prealloc(&stream->in, incnt, gfp); |
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if (ret) |
|
return ret; |
|
|
|
out: |
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stream->incnt = incnt; |
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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, |
|
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 handle_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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|
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ret = sctp_stream_alloc_out(stream, outcnt, gfp); |
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if (ret) |
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goto out_err; |
|
|
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for (i = 0; i < stream->outcnt; i++) |
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SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN; |
|
|
|
handle_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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goto in_err; |
|
|
|
goto out; |
|
|
|
in_err: |
|
sched->free(stream); |
|
genradix_free(&stream->in); |
|
out_err: |
|
genradix_free(&stream->out); |
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stream->outcnt = 0; |
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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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struct sctp_stream_out_ext *soute; |
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int ret; |
|
|
|
soute = kzalloc(sizeof(*soute), GFP_KERNEL); |
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if (!soute) |
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return -ENOMEM; |
|
SCTP_SO(stream, sid)->ext = soute; |
|
|
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ret = sctp_sched_init_sid(stream, sid, GFP_KERNEL); |
|
if (ret) { |
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kfree(SCTP_SO(stream, sid)->ext); |
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SCTP_SO(stream, sid)->ext = NULL; |
|
} |
|
|
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return ret; |
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} |
|
|
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void sctp_stream_free(struct sctp_stream *stream) |
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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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genradix_free(&stream->out); |
|
genradix_free(&stream->in); |
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} |
|
|
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void sctp_stream_clear(struct sctp_stream *stream) |
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{ |
|
int i; |
|
|
|
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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for (i = 0; i < stream->incnt; i++) |
|
SCTP_SI(stream, i)->mid = 0; |
|
} |
|
|
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void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new) |
|
{ |
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struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); |
|
|
|
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.tree.root = NULL; |
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new->in.tree.root = NULL; |
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new->outcnt = 0; |
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new->incnt = 0; |
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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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int retval = 0; |
|
|
|
retval = sctp_primitive_RECONF(asoc->base.net, asoc, chunk); |
|
if (retval) |
|
sctp_chunk_free(chunk); |
|
|
|
return retval; |
|
} |
|
|
|
static bool sctp_stream_outq_is_empty(struct sctp_stream *stream, |
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__u16 str_nums, __be16 *str_list) |
|
{ |
|
struct sctp_association *asoc; |
|
__u16 i; |
|
|
|
asoc = container_of(stream, struct sctp_association, stream); |
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if (!asoc->outqueue.out_qlen) |
|
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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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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if (asoc->strreset_outstanding) { |
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retval = -EINPROGRESS; |
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goto out; |
|
} |
|
|
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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) |
|
goto out; |
|
|
|
str_nums = params->srs_number_streams; |
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str_list = params->srs_stream_list; |
|
if (str_nums) { |
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int param_len = 0; |
|
|
|
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; |
|
|
|
param_len = str_nums * sizeof(__u16) + |
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sizeof(struct sctp_strreset_outreq); |
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} |
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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 - |
|
sizeof(struct sctp_reconf_chunk)) |
|
goto out; |
|
} |
|
|
|
nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL); |
|
if (!nstr_list) { |
|
retval = -ENOMEM; |
|
goto out; |
|
} |
|
|
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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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kfree(nstr_list); |
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retval = -EAGAIN; |
|
goto out; |
|
} |
|
|
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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) { |
|
retval = -ENOMEM; |
|
goto out; |
|
} |
|
|
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if (out) { |
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if (str_nums) |
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for (i = 0; i < str_nums; i++) |
|
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; |
|
} |
|
|
|
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; |
|
if (!out) |
|
goto out; |
|
|
|
if (str_nums) |
|
for (i = 0; i < str_nums; i++) |
|
SCTP_SO(stream, str_list[i])->state = |
|
SCTP_STREAM_OPEN; |
|
else |
|
for (i = 0; i < stream->outcnt; i++) |
|
SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN; |
|
|
|
goto out; |
|
} |
|
|
|
asoc->strreset_outstanding = out + in; |
|
|
|
out: |
|
return retval; |
|
} |
|
|
|
int sctp_send_reset_assoc(struct sctp_association *asoc) |
|
{ |
|
struct sctp_stream *stream = &asoc->stream; |
|
struct sctp_chunk *chunk = NULL; |
|
int retval; |
|
__u16 i; |
|
|
|
if (!asoc->peer.reconf_capable || |
|
!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) |
|
return -ENOPROTOOPT; |
|
|
|
if (asoc->strreset_outstanding) |
|
return -EINPROGRESS; |
|
|
|
if (!sctp_outq_is_empty(&asoc->outqueue)) |
|
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++) |
|
SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED; |
|
|
|
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; |
|
|
|
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 || |
|
!(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; |
|
} |
|
|
|
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; |
|
__be16 *str_p = NULL; |
|
__u32 request_seq; |
|
__u16 i, nums; |
|
|
|
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; |
|
|
|
nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16); |
|
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; |
|
} |
|
} |
|
|
|
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; |
|
} |
|
} |
|
|
|
if (nums) |
|
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, |
|
SCTP_STREAM_RESET_INCOMING_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; |
|
|
|
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; |
|
|
|
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; |
|
|
|
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; |
|
} |
|
} |
|
|
|
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; |
|
|
|
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); |
|
|
|
flags |= SCTP_STREAM_RESET_INCOMING_SSN; |
|
|
|
*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 { |
|
sctp_stream_shrink_out(stream, number); |
|
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; |
|
}
|
|
|