From 242bd2d519d7194633e309286ba7ba29a1ad63e8 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Thu, 9 Feb 2017 01:18:20 +0800 Subject: sctp: implement sender-side procedures for Add Incoming/Outgoing Streams Request Parameter This patch is to implement Sender-Side Procedures for the Add Outgoing and Incoming Streams Request Parameter described in rfc6525 section 5.1.5-5.1.6. It is also to add sockopt SCTP_ADD_STREAMS in rfc6525 section 6.3.4 for users. Signed-off-by: Xin Long Acked-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller --- net/sctp/stream.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) (limited to 'net/sctp/stream.c') diff --git a/net/sctp/stream.c b/net/sctp/stream.c index 53e49fc2f0a3..eb02490245ba 100644 --- a/net/sctp/stream.c +++ b/net/sctp/stream.c @@ -217,3 +217,80 @@ int sctp_send_reset_assoc(struct sctp_association *asoc) 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 = -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; +} -- cgit v1.2.3