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sctp: implement sender-side procedures for SSN Reset Request Parameter

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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>
This commit is contained in:
Xin Long
2017-01-18 00:44:47 +08:00
committed by David S. Miller
parent 9fb657aec0
commit 7f9d68ac94
6 changed files with 149 additions and 10 deletions
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79
net/sctp/stream.c
View File

@@ -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;
}