From 01aadb3af6e1b10970c1f7e510b5097c8f725d64 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Sat, 9 Jul 2016 19:47:44 +0800 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- net/sctp/chunk.c | 4 ++++ net/sctp/sm_make_chunk.c | 2 ++ 2 files changed, 6 insertions(+) diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c index 2698d122e201..b3692b55a8d2 100644 --- a/net/sctp/chunk.c +++ b/net/sctp/chunk.c @@ -355,6 +355,10 @@ int sctp_chunk_abandoned(struct sctp_chunk *chunk) else chunk->asoc->abandoned_unsent[SCTP_PR_INDEX(TTL)]++; return 1; + } else if (SCTP_PR_RTX_ENABLED(chunk->sinfo.sinfo_flags) && + chunk->sent_count > chunk->prsctp_param) { + chunk->asoc->abandoned_sent[SCTP_PR_INDEX(RTX)]++; + return 1; } return 0; diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 2c431eef3a50..cfde934af5c5 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -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