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| author | David Howells | 2017-11-24 11:18:42 +0100 |
|---|---|---|
| committer | David Howells | 2017-11-24 11:18:42 +0100 |
| commit | 415f44e43282a16ec0808c7ccfd401762e587437 (patch) | |
| tree | f6ccecc27740451b869f783156394569c3161a78 /security/inode.c | |
| parent | rxrpc: Add a timeout for detecting lost ACKs/lost DATA (diff) | |
| download | kernel-qcow2-linux-415f44e43282a16ec0808c7ccfd401762e587437.tar.gz kernel-qcow2-linux-415f44e43282a16ec0808c7ccfd401762e587437.tar.xz kernel-qcow2-linux-415f44e43282a16ec0808c7ccfd401762e587437.zip | |
rxrpc: Add keepalive for a call
We need to transmit a packet every so often to act as a keepalive for the
peer (which has a timeout from the last time it received a packet) and also
to prevent any intervening firewalls from closing the route.
Do this by resetting a timer every time we transmit a packet. If the timer
ever expires, we transmit a PING ACK packet and thereby also elicit a PING
RESPONSE ACK from the other side - which prevents our last-rx timeout from
expiring.
The timer is set to 1/6 of the last-rx timeout so that we can detect the
other side going away if it misses 6 replies in a row.
This is particularly necessary for servers where the processing of the
service function may take a significant amount of time.
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'security/inode.c')
0 files changed, 0 insertions, 0 deletions