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sctp: implement the receiver side for SACK-IMMEDIATELY extension

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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>
This commit is contained in:
Wei Yongjun 2009-11-23 15:53:53 -05:00 committed by Vlad Yasevich
parent 475cba4ec8
commit 6dc7694f9d
1 changed files with 6 additions and 2 deletions
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8
net/sctp/sm_statefuns.c
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@ -2868,6 +2868,7 @@ sctp_disposition_t sctp_sf_eat_data_6_2(const struct sctp_endpoint *ep,
sctp_cmd_seq_t *commands) sctp_cmd_seq_t *commands)
{ {
struct sctp_chunk *chunk = arg; struct sctp_chunk *chunk = arg;
sctp_arg_t force = SCTP_NOFORCE();
int error; int error;
if (!sctp_vtag_verify(chunk, asoc)) { if (!sctp_vtag_verify(chunk, asoc)) {
@ -2901,6 +2902,9 @@ sctp_disposition_t sctp_sf_eat_data_6_2(const struct sctp_endpoint *ep,
BUG(); BUG();
} }
if (chunk->chunk_hdr->flags & SCTP_DATA_SACK_IMM)
force = SCTP_FORCE();
if (asoc->autoclose) { if (asoc->autoclose) {
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE));
@ -2929,7 +2933,7 @@ sctp_disposition_t sctp_sf_eat_data_6_2(const struct sctp_endpoint *ep,
* more aggressive than the following algorithms allow. * more aggressive than the following algorithms allow.
*/ */
if (chunk->end_of_packet) 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; return SCTP_DISPOSITION_CONSUME;
@ -2954,7 +2958,7 @@ discard_force:
discard_noforce: discard_noforce:
if (chunk->end_of_packet) 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; return SCTP_DISPOSITION_DISCARD;
consume: consume: