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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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33
net/sctp/outqueue.c
View file

@ -915,22 +915,28 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
case SCTP_CID_ECN_ECNE:
case SCTP_CID_ASCONF:
case SCTP_CID_FWD_TSN:
case SCTP_CID_RECONF:
status = sctp_packet_transmit_chunk(packet, chunk,
one_packet, gfp);
if (status != SCTP_XMIT_OK) {
/* put the chunk back */
list_add(&chunk->list, &q->control_chunk_list);
} else {
asoc->stats.octrlchunks++;
/* PR-SCTP C5) If a FORWARD TSN is sent, the
* sender MUST assure that at least one T3-rtx
* timer is running.
*/
if (chunk->chunk_hdr->type == SCTP_CID_FWD_TSN) {
sctp_transport_reset_t3_rtx(transport);
transport->last_time_sent = jiffies;
}
break;
}
asoc->stats.octrlchunks++;
/* PR-SCTP C5) If a FORWARD TSN is sent, the
* sender MUST assure that at least one T3-rtx
* timer is running.
*/
if (chunk->chunk_hdr->type == SCTP_CID_FWD_TSN) {
sctp_transport_reset_t3_rtx(transport);
transport->last_time_sent = jiffies;
}
if (chunk == asoc->strreset_chunk)
sctp_transport_reset_reconf_timer(transport);
break;
default:
@ -1016,6 +1022,8 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
/* Finally, transmit new packets. */
while ((chunk = sctp_outq_dequeue_data(q)) != NULL) {
__u32 sid = ntohs(chunk->subh.data_hdr->stream);
/* RFC 2960 6.5 Every DATA chunk MUST carry a valid
* stream identifier.
*/
@ -1038,6 +1046,11 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
continue;
}
if (asoc->stream->out[sid].state == SCTP_STREAM_CLOSED) {
sctp_outq_head_data(q, chunk);
goto sctp_flush_out;
}
/* If there is a specified transport, use it.
* Otherwise, we want to use the active path.
*/