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authorVlad Yasevich <vladislav.yasevich@hp.com>2009-02-13 08:33:43 +0000
committerDavid S. Miller <davem@davemloft.net>2009-02-16 00:03:10 -0800
commitfaee47cdbfe8d74a1573c2f81ea6dbb08d735be6 (patch)
tree6a95e8f91087cd3d584fc89f9bc06355d371d82a /include/net/sctp
parent4458f04c02a46c679a90ef71f866a415c192deb4 (diff)
sctp: Fix the RTO-doubling on idle-link heartbeats
SCTP incorrectly doubles rto ever time a Hearbeat chunk is generated. However RFC 4960 states: On an idle destination address that is allowed to heartbeat, it is recommended that a HEARTBEAT chunk is sent once per RTO of that destination address plus the protocol parameter 'HB.interval', with jittering of +/- 50% of the RTO value, and exponential backoff of the RTO if the previous HEARTBEAT is unanswered. Essentially, of if the heartbean is unacknowledged, do we double the RTO. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sctp')
-rw-r--r--include/net/sctp/structs.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 9f70d54fcef..23f08fe1d50 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -910,8 +910,10 @@ struct sctp_transport {
* should be set. Every time the RTT
* calculation completes (i.e. the DATA chunk
* is SACK'd) clear this flag.
+ * hb_sent : a flag that signals that we have a pending heartbeat.
*/
__u8 rto_pending;
+ __u8 hb_sent;
/* Flag to track the current fast recovery state */
__u8 fast_recovery;