sctp: implement the receiver side for SACK-IMMEDIATELY extension
This patch implement the receiver side for SACK-IMMEDIATELY
extension:
Section 4.2. Receiver Side Considerations
On reception of an SCTP packet containing a DATA chunk with the I-bit
set, the receiver SHOULD NOT delay the sending of the corresponding
SACK chunk and SHOULD send it back immediately.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index d4df450..8ee24c9 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -2868,6 +2868,7 @@
sctp_cmd_seq_t *commands)
{
struct sctp_chunk *chunk = arg;
+ sctp_arg_t force = SCTP_NOFORCE();
int error;
if (!sctp_vtag_verify(chunk, asoc)) {
@@ -2901,6 +2902,9 @@
BUG();
}
+ if (chunk->chunk_hdr->flags & SCTP_DATA_SACK_IMM)
+ force = SCTP_FORCE();
+
if (asoc->autoclose) {
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE));
@@ -2929,7 +2933,7 @@
* more aggressive than the following algorithms allow.
*/
if (chunk->end_of_packet)
- sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE());
+ sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force);
return SCTP_DISPOSITION_CONSUME;
@@ -2954,7 +2958,7 @@
discard_noforce:
if (chunk->end_of_packet)
- sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE());
+ sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force);
return SCTP_DISPOSITION_DISCARD;
consume: