ipv4: Create probe timer for tcp PMTU as per RFC4821
authorFan Du <fan.du@intel.com>
Fri, 6 Mar 2015 03:18:24 +0000 (11:18 +0800)
committerDavid S. Miller <davem@davemloft.net>
Fri, 6 Mar 2015 19:57:42 +0000 (14:57 -0500)
commit05cbc0db03e82128f2e7e353d4194dd24a1627fe
tree33c79cec0d026feb0435042794ca4c4ef9e556ce
parent6b58e0a5f32dedb609438bb9c9c82aa6e23381f2
ipv4: Create probe timer for tcp PMTU as per RFC4821

As per RFC4821 7.3.  Selecting Probe Size, a probe timer should
be armed once probing has converged. Once this timer expired,
probing again to take advantage of any path PMTU change. The
recommended probing interval is 10 minutes per RFC1981. Probing
interval could be sysctled by sysctl_tcp_probe_interval.

Eric Dumazet suggested to implement pseudo timer based on 32bits
jiffies tcp_time_stamp instead of using classic timer for such
rare event.

Signed-off-by: Fan Du <fan.du@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/inet_connection_sock.h
include/net/netns/ipv4.h
include/net/tcp.h
net/ipv4/sysctl_net_ipv4.c
net/ipv4/tcp_ipv4.c
net/ipv4/tcp_output.c
net/ipv4/tcp_timer.c