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Release 4.11 net/sctp/stream.c

Directory: net/sctp
/* 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>


int sctp_stream_new(struct sctp_association *asoc, gfp_t gfp) { struct sctp_stream *stream; int i; stream = kzalloc(sizeof(*stream), gfp); if (!stream) return -ENOMEM; stream->outcnt = asoc->c.sinit_num_ostreams; stream->out = kcalloc(stream->outcnt, sizeof(*stream->out), gfp); if (!stream->out) { kfree(stream); return -ENOMEM; } for (i = 0; i < stream->outcnt; i++) stream->out[i].state = SCTP_STREAM_OPEN; asoc->stream = stream; return 0; }

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int sctp_stream_init(struct sctp_association *asoc, gfp_t gfp) { struct sctp_stream *stream = asoc->stream; int i; /* Initial stream->out size may be very big, so free it and alloc * a new one with new outcnt to save memory. */ kfree(stream->out); stream->outcnt = asoc->c.sinit_num_ostreams; stream->out = kcalloc(stream->outcnt, sizeof(*stream->out), gfp); if (!stream->out) goto nomem; for (i = 0; i < stream->outcnt; i++) stream->out[i].state = SCTP_STREAM_OPEN; stream->incnt = asoc->c.sinit_max_instreams; stream->in = kcalloc(stream->incnt, sizeof(*stream->in), gfp); if (!stream->in) { kfree(stream->out); goto nomem; } return 0; nomem: asoc->stream = NULL; kfree(stream); return -ENOMEM; }

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void sctp_stream_free(struct sctp_stream *stream) { if (unlikely(!stream)) return; kfree(stream->out); kfree(stream->in); kfree(stream); }

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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; }

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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; }

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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; for (i = 0; i < str_nums; i++) str_list[i] = htons(str_list[i]); chunk = sctp_make_strreset_req(asoc, str_nums, str_list, out, in); for (i = 0; i < str_nums; i++) str_list[i] = ntohs(str_list[i]); if (!chunk) { retval = -ENOMEM; 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_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++) stream->out[str_list[i]].state = SCTP_STREAM_OPEN; else for (i = 0; i < stream->outcnt; i++) stream->out[i].state = SCTP_STREAM_OPEN; goto out; } asoc->strreset_outstanding = out + in; out: return retval; }

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int sctp_send_reset_assoc(struct sctp_association *asoc) { 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; chunk = sctp_make_strreset_tsnreq(asoc); if (!chunk) return -ENOMEM; /* Block further xmit of data until this request is completed */ for (i = 0; i < asoc->stream->outcnt; i++) asoc->stream->out[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 < asoc->stream->outcnt; i++) asoc->stream->out[i].state = SCTP_STREAM_OPEN; return retval; } asoc->strreset_outstanding = 1; return 0; }

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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 = -ENOMEM; __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) { struct sctp_stream_out *streamout; streamout = krealloc(stream->out, outcnt * sizeof(*streamout), GFP_KERNEL); if (!streamout) goto out; memset(streamout + stream->outcnt, 0, out * sizeof(*streamout)); stream->out = streamout; } if (in) { struct sctp_stream_in *streamin; streamin = krealloc(stream->in, incnt * sizeof(*streamin), GFP_KERNEL); if (!streamin) goto out; memset(streamin + stream->incnt, 0, in * sizeof(*streamin)); stream->in = streamin; } chunk = sctp_make_strreset_addstrm(asoc, out, in); if (!chunk) 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; }

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static sctp_paramhdr_t *sctp_chunk_lookup_strreset_param( struct sctp_association *asoc, __u32 resp_seq) { struct sctp_chunk *chunk = asoc->strreset_chunk; struct sctp_reconf_chunk *hdr; union sctp_params param; if (ntohl(resp_seq) != asoc->strreset_outseq || !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 (req->request_seq == resp_seq) return param.v; } return NULL; }

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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; __u16 i, nums, flags = 0, *str_p = NULL; __u32 result = SCTP_STRRESET_DENIED; __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 out; } if (request_seq > asoc->strreset_inseq) { result = SCTP_STRRESET_ERR_BAD_SEQNO; goto out; } else if (request_seq == asoc->strreset_inseq) { 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) { sctp_paramhdr_t *param_hdr; struct sctp_transport *t; param_hdr = sctp_chunk_lookup_strreset_param( asoc, outreq->response_seq); if (!param_hdr || param_hdr->type != 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) { 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)) / 2; 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++) stream->in[ntohs(str_p[i])].ssn = 0; } else { for (i = 0; i < stream->incnt; i++) stream->in[i].ssn = 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: return sctp_make_strreset_resp(asoc, result, request_seq); }

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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; __u16 i, nums, *str_p; __u32 request_seq; request_seq = ntohl(inreq->request_seq); if (request_seq > asoc->strreset_inseq) { result = SCTP_STRRESET_ERR_BAD_SEQNO; goto out; } else if (request_seq == asoc->strreset_inseq) { 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)) / 2; 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; } } chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0); if (!chunk) goto out; if (nums) for (i = 0; i < nums; i++) stream->out[ntohs(str_p[i])].state = SCTP_STREAM_CLOSED; else for (i = 0; i < stream->outcnt; i++) stream->out[i].state = SCTP_STREAM_CLOSED; asoc->strreset_chunk = chunk; asoc->strreset_outstanding = 1; sctp_chunk_hold(asoc->strreset_chunk); *evp = sctp_ulpevent_make_stream_reset_event(asoc, SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC); out: if (!chunk) chunk = sctp_make_strreset_resp(asoc, result, request_seq); return chunk; }

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Directory: net/sctp
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