Commit 01aadb3a authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: implement prsctp RTX policy

prsctp RTX policy is a policy to abandon chunks when they are
retransmitted beyond the max count.

This patch uses sent_count to count how many times one chunk has
been sent, and prsctp_param is the max rtx count, which is from
sinfo->sinfo_timetolive in sctp_set_prsctp_policy(). So similar
to TTL policy, if RTX policy is enabled, msg->expire_at won't

Then in sctp_chunk_abandoned, this patch checks if chunk->sent_count
is bigger than chunk->prsctp_param to abandon this chunk.
Signed-off-by: default avatarXin Long <>
Signed-off-by: default avatarDavid S. Miller <>
parent a6c2f792
......@@ -355,6 +355,10 @@ int sctp_chunk_abandoned(struct sctp_chunk *chunk)
return 1;
} else if (SCTP_PR_RTX_ENABLED(chunk->sinfo.sinfo_flags) &&
chunk->sent_count > chunk->prsctp_param) {
return 1;
return 0;
......@@ -720,6 +720,8 @@ static void sctp_set_prsctp_policy(struct sctp_chunk *chunk,
if (SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags))
chunk->prsctp_param =
jiffies + msecs_to_jiffies(sinfo->sinfo_timetolive);
else if (SCTP_PR_RTX_ENABLED(sinfo->sinfo_flags))
chunk->prsctp_param = sinfo->sinfo_timetolive;
/* Make a DATA chunk for the given association from the provided
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