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authorXin Long <lucien.xin@gmail.com>2021-06-22 21:04:51 +0300
committerDavid S. Miller <davem@davemloft.net>2021-06-22 21:28:52 +0300
commit92548ec2f1f92d0c0b60ce59592b645571672568 (patch)
tree61452953d827760f72aee433d9d1ccc794fe244e /net/sctp/sm_statefuns.c
parentd9e2e410ae301d4b540e965daca51de0e65e8a26 (diff)
downloadlinux-92548ec2f1f92d0c0b60ce59592b645571672568.tar.xz
sctp: add the probe timer in transport for PLPMTUD
There are 3 timers described in rfc8899#section-5.1.1: PROBE_TIMER, PMTU_RAISE_TIMER, CONFIRMATION_TIMER This patches adds a 'probe_timer' in transport, and it works as either PROBE_TIMER or PMTU_RAISE_TIMER. At most time, it works as PROBE_TIMER and expires every a 'probe_interval' time to send the HB probe packet. When transport pl enters COMPLETE state, it works as PMTU_RAISE_TIMER and expires in 'probe_interval * 30' time to go back to SEARCH state and do searching again. SCTP HB is an acknowledged packet, CONFIRMATION_TIMER is not needed. The timer will start when transport pl enters BASE state and stop when it enters DISABLED state. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/sm_statefuns.c')
-rw-r--r--net/sctp/sm_statefuns.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 4f30388a0dd0..3b99eda50618 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -1095,6 +1095,23 @@ enum sctp_disposition sctp_sf_send_reconf(struct net *net,
return SCTP_DISPOSITION_CONSUME;
}
+/* send hb chunk with padding for PLPMUTD. */
+enum sctp_disposition sctp_sf_send_probe(struct net *net,
+ const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const union sctp_subtype type,
+ void *arg,
+ struct sctp_cmd_seq *commands)
+{
+ struct sctp_transport *transport = (struct sctp_transport *)arg;
+
+ /* The actual handling will be performed here in a later patch. */
+ sctp_add_cmd_sf(commands, SCTP_CMD_PROBE_TIMER_UPDATE,
+ SCTP_TRANSPORT(transport));
+
+ return SCTP_DISPOSITION_CONSUME;
+}
+
/*
* Process an heartbeat request.
*