xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

sctp: Fix the RTO-doubling on idle-link heartbeats

Browse Source 
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>
This commit is contained in:
Vlad Yasevich
2009-02-13 08:33:43 +00:00
committed by David S. Miller
parent 4458f04c02
commit faee47cdbf
3 changed files with 19 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/sctp/structs.h
View File

@@ -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;