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![Xin Long](/assets/img/avatar_default.png)
This patch is to implement Receiver-Side Procedures for the Incoming SSN Reset Request Parameter described in rfc6525 section 5.2.3. It's also to move str_list endian conversion out of sctp_make_strreset_req, so that sctp_make_strreset_req can be used more conveniently to process inreq. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
479 lines
11 KiB
C
479 lines
11 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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* These functions manipulate sctp tsn mapping array.
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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 <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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struct sctp_stream *sctp_stream_new(__u16 incnt, __u16 outcnt, gfp_t gfp)
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{
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struct sctp_stream *stream;
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int i;
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stream = kzalloc(sizeof(*stream), gfp);
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if (!stream)
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return NULL;
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stream->outcnt = outcnt;
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stream->out = kcalloc(stream->outcnt, sizeof(*stream->out), gfp);
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if (!stream->out) {
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kfree(stream);
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return NULL;
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}
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for (i = 0; i < stream->outcnt; i++)
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stream->out[i].state = SCTP_STREAM_OPEN;
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stream->incnt = incnt;
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stream->in = kcalloc(stream->incnt, sizeof(*stream->in), gfp);
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if (!stream->in) {
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kfree(stream->out);
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kfree(stream);
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return NULL;
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}
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return stream;
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}
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void sctp_stream_free(struct sctp_stream *stream)
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{
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if (unlikely(!stream))
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return;
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kfree(stream->out);
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kfree(stream->in);
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kfree(stream);
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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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stream->out[i].ssn = 0;
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for (i = 0; i < stream->incnt; i++)
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stream->in[i].ssn = 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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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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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 (out && str_nums)
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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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if (in && str_nums)
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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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for (i = 0; i < str_nums; i++)
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str_list[i] = htons(str_list[i]);
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chunk = sctp_make_strreset_req(asoc, str_nums, str_list, out, in);
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for (i = 0; i < str_nums; i++)
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str_list[i] = ntohs(str_list[i]);
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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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stream->out[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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stream->out[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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stream->out[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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stream->out[i].state = SCTP_STREAM_OPEN;
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goto out;
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}
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asoc->strreset_outstanding = out + in;
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out:
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return retval;
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}
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int sctp_send_reset_assoc(struct sctp_association *asoc)
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{
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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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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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if (asoc->strreset_outstanding)
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return -EINPROGRESS;
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chunk = sctp_make_strreset_tsnreq(asoc);
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if (!chunk)
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return -ENOMEM;
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/* Block further xmit of data until this request is completed */
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for (i = 0; i < asoc->stream->outcnt; i++)
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asoc->stream->out[i].state = SCTP_STREAM_CLOSED;
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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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for (i = 0; i < asoc->stream->outcnt; i++)
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asoc->stream->out[i].state = SCTP_STREAM_OPEN;
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return retval;
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}
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asoc->strreset_outstanding = 1;
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return 0;
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}
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int sctp_send_add_streams(struct sctp_association *asoc,
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struct sctp_add_streams *params)
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{
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struct sctp_stream *stream = asoc->stream;
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struct sctp_chunk *chunk = NULL;
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int retval = -ENOMEM;
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__u32 outcnt, incnt;
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__u16 out, in;
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if (!asoc->peer.reconf_capable ||
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!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_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->sas_outstrms;
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in = params->sas_instrms;
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outcnt = stream->outcnt + out;
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incnt = stream->incnt + in;
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if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
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(!out && !in)) {
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retval = -EINVAL;
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goto out;
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}
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if (out) {
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struct sctp_stream_out *streamout;
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streamout = krealloc(stream->out, outcnt * sizeof(*streamout),
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GFP_KERNEL);
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if (!streamout)
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goto out;
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memset(streamout + stream->outcnt, 0, out * sizeof(*streamout));
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stream->out = streamout;
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}
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if (in) {
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struct sctp_stream_in *streamin;
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streamin = krealloc(stream->in, incnt * sizeof(*streamin),
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GFP_KERNEL);
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if (!streamin)
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goto out;
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memset(streamin + stream->incnt, 0, in * sizeof(*streamin));
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stream->in = streamin;
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}
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chunk = sctp_make_strreset_addstrm(asoc, out, in);
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if (!chunk)
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goto out;
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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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goto out;
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}
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stream->incnt = incnt;
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stream->outcnt = outcnt;
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asoc->strreset_outstanding = !!out + !!in;
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out:
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return retval;
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}
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static sctp_paramhdr_t *sctp_chunk_lookup_strreset_param(
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struct sctp_association *asoc, __u32 resp_seq)
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{
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struct sctp_chunk *chunk = asoc->strreset_chunk;
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struct sctp_reconf_chunk *hdr;
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union sctp_params param;
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if (ntohl(resp_seq) != asoc->strreset_outseq || !chunk)
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return NULL;
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hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
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sctp_walk_params(param, hdr, params) {
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/* sctp_strreset_tsnreq is actually the basic structure
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* of all stream reconf params, so it's safe to use it
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* to access request_seq.
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*/
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struct sctp_strreset_tsnreq *req = param.v;
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if (req->request_seq == resp_seq)
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return param.v;
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}
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return NULL;
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}
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struct sctp_chunk *sctp_process_strreset_outreq(
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struct sctp_association *asoc,
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union sctp_params param,
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struct sctp_ulpevent **evp)
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{
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struct sctp_strreset_outreq *outreq = param.v;
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struct sctp_stream *stream = asoc->stream;
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__u16 i, nums, flags = 0, *str_p = NULL;
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__u32 result = SCTP_STRRESET_DENIED;
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__u32 request_seq;
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request_seq = ntohl(outreq->request_seq);
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if (ntohl(outreq->send_reset_at_tsn) >
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sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
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result = SCTP_STRRESET_IN_PROGRESS;
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goto out;
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}
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if (request_seq > asoc->strreset_inseq) {
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result = SCTP_STRRESET_ERR_BAD_SEQNO;
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goto out;
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} else if (request_seq == asoc->strreset_inseq) {
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asoc->strreset_inseq++;
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}
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/* Check strreset_enable after inseq inc, as sender cannot tell
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* the peer doesn't enable strreset after receiving response with
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* result denied, as well as to keep consistent with bsd.
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*/
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if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
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goto out;
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if (asoc->strreset_chunk) {
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sctp_paramhdr_t *param_hdr;
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struct sctp_transport *t;
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param_hdr = sctp_chunk_lookup_strreset_param(
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asoc, outreq->response_seq);
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if (!param_hdr || param_hdr->type !=
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SCTP_PARAM_RESET_IN_REQUEST) {
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/* same process with outstanding isn't 0 */
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result = SCTP_STRRESET_ERR_IN_PROGRESS;
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goto out;
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}
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asoc->strreset_outstanding--;
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asoc->strreset_outseq++;
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if (!asoc->strreset_outstanding) {
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t = asoc->strreset_chunk->transport;
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if (del_timer(&t->reconf_timer))
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sctp_transport_put(t);
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sctp_chunk_put(asoc->strreset_chunk);
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asoc->strreset_chunk = NULL;
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}
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flags = SCTP_STREAM_RESET_INCOMING_SSN;
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}
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nums = (ntohs(param.p->length) - sizeof(*outreq)) / 2;
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if (nums) {
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str_p = outreq->list_of_streams;
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for (i = 0; i < nums; i++) {
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if (ntohs(str_p[i]) >= stream->incnt) {
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result = SCTP_STRRESET_ERR_WRONG_SSN;
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goto out;
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}
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}
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for (i = 0; i < nums; i++)
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stream->in[ntohs(str_p[i])].ssn = 0;
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} else {
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for (i = 0; i < stream->incnt; i++)
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stream->in[i].ssn = 0;
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}
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result = SCTP_STRRESET_PERFORMED;
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*evp = sctp_ulpevent_make_stream_reset_event(asoc,
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flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
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GFP_ATOMIC);
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out:
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return sctp_make_strreset_resp(asoc, result, request_seq);
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}
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struct sctp_chunk *sctp_process_strreset_inreq(
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struct sctp_association *asoc,
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union sctp_params param,
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struct sctp_ulpevent **evp)
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{
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struct sctp_strreset_inreq *inreq = param.v;
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struct sctp_stream *stream = asoc->stream;
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__u32 result = SCTP_STRRESET_DENIED;
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struct sctp_chunk *chunk = NULL;
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__u16 i, nums, *str_p;
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__u32 request_seq;
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request_seq = ntohl(inreq->request_seq);
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if (request_seq > asoc->strreset_inseq) {
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result = SCTP_STRRESET_ERR_BAD_SEQNO;
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goto out;
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} else if (request_seq == asoc->strreset_inseq) {
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asoc->strreset_inseq++;
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}
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if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
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goto out;
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if (asoc->strreset_outstanding) {
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result = SCTP_STRRESET_ERR_IN_PROGRESS;
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goto out;
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}
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nums = (ntohs(param.p->length) - sizeof(*inreq)) / 2;
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str_p = inreq->list_of_streams;
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for (i = 0; i < nums; i++) {
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if (ntohs(str_p[i]) >= stream->outcnt) {
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result = SCTP_STRRESET_ERR_WRONG_SSN;
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goto out;
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}
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}
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chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
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if (!chunk)
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goto out;
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if (nums)
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for (i = 0; i < nums; i++)
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stream->out[ntohs(str_p[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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stream->out[i].state = SCTP_STREAM_CLOSED;
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asoc->strreset_chunk = chunk;
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asoc->strreset_outstanding = 1;
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sctp_chunk_hold(asoc->strreset_chunk);
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*evp = sctp_ulpevent_make_stream_reset_event(asoc,
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SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
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out:
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if (!chunk)
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chunk = sctp_make_strreset_resp(asoc, result, request_seq);
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return chunk;
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}
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