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authorXin Long <lucien.xin@gmail.com>2017-01-17 19:44:47 +0300
committerDavid S. Miller <davem@davemloft.net>2017-01-18 22:55:11 +0300
commit7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 (patch)
tree08007191a5e6a018f08dd26919305175b5a14b23 /net/sctp/stream.c
parent9fb657aec0e20b4ed4401c44a4140f8d7b7a9ca0 (diff)
downloadlinux-7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137.tar.xz
sctp: implement sender-side procedures for SSN Reset Request Parameter
This patch is to implement sender-side procedures for the Outgoing and Incoming SSN Reset Request Parameter described in rfc6525 section 5.1.2 and 5.1.3. It is also add sockopt SCTP_RESET_STREAMS in rfc6525 section 6.3.2 for users. Note that the new asoc member strreset_outstanding is to make sure only one reconf request chunk on the fly as rfc6525 section 5.1.1 demands. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/stream.c')
-rw-r--r--net/sctp/stream.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index f86de43cbbe5..13d5e07dcd7d 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -33,6 +33,7 @@
*/
#include <net/sctp/sctp.h>
+#include <net/sctp/sm.h>
struct sctp_stream *sctp_stream_new(__u16 incnt, __u16 outcnt, gfp_t gfp)
{
@@ -83,3 +84,81 @@ void sctp_stream_clear(struct sctp_stream *stream)
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;
+}