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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
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20
net/sctp/chunk.c
View file

@ -335,13 +335,27 @@ errout:
/* Check whether this message has expired. */
int sctp_chunk_abandoned(struct sctp_chunk *chunk)
{
struct sctp_datamsg *msg = chunk->msg;
if (!chunk->asoc->prsctp_enable ||
!SCTP_PR_POLICY(chunk->sinfo.sinfo_flags)) {
struct sctp_datamsg *msg = chunk->msg;
if (!msg->can_abandon)
return 0;
if (time_after(jiffies, msg->expires_at))
return 1;
if (!msg->can_abandon)
return 0;
}
if (time_after(jiffies, msg->expires_at))
if (SCTP_PR_TTL_ENABLED(chunk->sinfo.sinfo_flags) &&
time_after(jiffies, chunk->prsctp_param)) {
if (chunk->sent_count)
chunk->asoc->abandoned_sent[SCTP_PR_INDEX(TTL)]++;
else
chunk->asoc->abandoned_unsent[SCTP_PR_INDEX(TTL)]++;
return 1;
}
return 0;
}