sctp: implement prsctp TTL policy
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>
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index 1eb94bf..2698d12 100644
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -335,13 +335,27 @@
/* 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)
+ if (!msg->can_abandon)
+ return 0;
+
+ if (time_after(jiffies, msg->expires_at))
+ return 1;
+
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;
}
diff --git a/net/sctp/output.c b/net/sctp/output.c
index 2e9223b..7425f6c 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -316,6 +316,8 @@
packet->has_data = 1;
/* timestamp the chunk for rtx purposes */
chunk->sent_at = jiffies;
+ /* Mainly used for prsctp RTX policy */
+ chunk->sent_count++;
break;
case SCTP_CID_COOKIE_ECHO:
packet->has_cookie_echo = 1;
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 0e3045e..2c431ee 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -711,6 +711,17 @@
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 @@
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;
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c3167c4..0861429 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -7099,7 +7099,7 @@
if (cmsgs->srinfo->sinfo_flags &
~(SCTP_UNORDERED | SCTP_ADDR_OVER |
- SCTP_SACK_IMMEDIATELY |
+ SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
SCTP_ABORT | SCTP_EOF))
return -EINVAL;
break;
@@ -7123,7 +7123,7 @@
if (cmsgs->sinfo->snd_flags &
~(SCTP_UNORDERED | SCTP_ADDR_OVER |
- SCTP_SACK_IMMEDIATELY |
+ SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
SCTP_ABORT | SCTP_EOF))
return -EINVAL;
break;