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sctp: implement prsctp TTL policy

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prsctp TTL policy is a policy to abandon chunks when they expire
at the specific time in local stack. It's similar with expires_at
in struct sctp_datamsg.

This patch uses sinfo->sinfo_timetolive to set the specific time for
TTL policy. sinfo->sinfo_timetolive is also used for msg->expires_at.
So if prsctp_enable or TTL policy is not enabled, msg->expires_at
still works as before.

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
2016-07-09 19:47:43 +08:00
committed by David S. Miller
parent 826d253d57
commit a6c2f79287
5 changed files with 43 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
net/sctp/sm_make_chunk.c
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@@ -711,6 +711,17 @@ nodata:
return retval;
}
static void sctp_set_prsctp_policy(struct sctp_chunk *chunk,
const struct sctp_sndrcvinfo *sinfo)
{
if (!chunk->asoc->prsctp_enable)
return;
if (SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags))
chunk->prsctp_param =
jiffies + msecs_to_jiffies(sinfo->sinfo_timetolive);
}
/* Make a DATA chunk for the given association from the provided
* parameters. However, do not populate the data payload.
*/
@@ -744,6 +755,7 @@ struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
sctp_set_prsctp_policy(retval, sinfo);
nodata:
return retval;