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
work.
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: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 2c431ee..cfde934 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -720,6 +720,8 @@
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