diff options
Diffstat (limited to 'net/sctp/stream.c')
| -rw-r--r-- | net/sctp/stream.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/net/sctp/stream.c b/net/sctp/stream.c new file mode 100644 index 000000000000..13d5e07dcd7d --- /dev/null +++ b/net/sctp/stream.c @@ -0,0 +1,164 @@ +/* SCTP kernel implementation + * (C) Copyright IBM Corp. 2001, 2004 + * Copyright (c) 1999-2000 Cisco, Inc. + * Copyright (c) 1999-2001 Motorola, Inc. + * Copyright (c) 2001 Intel Corp. + * + * This file is part of the SCTP kernel implementation + * + * These functions manipulate sctp tsn mapping array. + * + * This SCTP implementation is free software; + * you can redistribute it and/or modify it under the terms of + * the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This SCTP implementation is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; without even the implied + * ************************ + * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU CC; see the file COPYING. If not, see + * <http://www.gnu.org/licenses/>. + * + * Please send any bug reports or fixes you make to the + * email address(es): + * lksctp developers <linux-sctp@vger.kernel.org> + * + * Written or modified by: + * Xin Long <lucien.xin@gmail.com> + */ + +#include <net/sctp/sctp.h> +#include <net/sctp/sm.h> + +struct sctp_stream *sctp_stream_new(__u16 incnt, __u16 outcnt, gfp_t gfp) +{ + struct sctp_stream *stream; + int i; + + stream = kzalloc(sizeof(*stream), gfp); + if (!stream) + return NULL; + + stream->outcnt = outcnt; + stream->out = kcalloc(stream->outcnt, sizeof(*stream->out), gfp); + if (!stream->out) { + kfree(stream); + return NULL; + } + for (i = 0; i < stream->outcnt; i++) + stream->out[i].state = SCTP_STREAM_OPEN; + + stream->incnt = incnt; + stream->in = kcalloc(stream->incnt, sizeof(*stream->in), gfp); + if (!stream->in) { + kfree(stream->out); + kfree(stream); + return NULL; + } + + return stream; +} + +void sctp_stream_free(struct sctp_stream *stream) +{ + if (unlikely(!stream)) + return; + + kfree(stream->out); + kfree(stream->in); + kfree(stream); +} + +void sctp_stream_clear(struct sctp_stream *stream) +{ + int i; + + for (i = 0; i < stream->outcnt; i++) + stream->out[i].ssn = 0; + + for (i = 0; i < stream->incnt; i++) + stream->in[i].ssn = 0; +} + +static int sctp_send_reconf(struct sctp_association *asoc, + struct sctp_chunk *chunk) +{ + struct net *net = sock_net(asoc->base.sk); + int retval = 0; + + retval = sctp_primitive_RECONF(net, asoc, chunk); + if (retval) + sctp_chunk_free(chunk); + + return retval; +} + +int sctp_send_reset_streams(struct sctp_association *asoc, + struct sctp_reset_streams *params) +{ + struct sctp_stream *stream = asoc->stream; + __u16 i, str_nums, *str_list; + struct sctp_chunk *chunk; + int retval = -EINVAL; + bool out, in; + + if (!asoc->peer.reconf_capable || + !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) { + retval = -ENOPROTOOPT; + goto out; + } + + if (asoc->strreset_outstanding) { + retval = -EINPROGRESS; + goto out; + } + + out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING; + in = params->srs_flags & SCTP_STREAM_RESET_INCOMING; + if (!out && !in) + goto out; + + str_nums = params->srs_number_streams; + str_list = params->srs_stream_list; + if (out && str_nums) + for (i = 0; i < str_nums; i++) + if (str_list[i] >= stream->outcnt) + goto out; + + if (in && str_nums) + for (i = 0; i < str_nums; i++) + if (str_list[i] >= stream->incnt) + goto out; + + chunk = sctp_make_strreset_req(asoc, str_nums, str_list, out, in); + if (!chunk) + goto out; + + if (out) { + if (str_nums) + for (i = 0; i < str_nums; i++) + stream->out[str_list[i]].state = + SCTP_STREAM_CLOSED; + else + for (i = 0; i < stream->outcnt; i++) + stream->out[i].state = SCTP_STREAM_CLOSED; + } + + asoc->strreset_outstanding = out + in; + 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; + } + +out: + return retval; +} |