tcp/dccp: warn user for preferred ip_local_port_range
authorEric Dumazet <edumazet@google.com>
Wed, 27 May 2015 18:34:37 +0000 (11:34 -0700)
committerDavid S. Miller <davem@davemloft.net>
Wed, 27 May 2015 18:35:36 +0000 (14:35 -0400)
commited2dfd900992aa7b6b3d0abd8ec9a7e9d2c7f827
tree76e6fa096ffb9ab01b52b564c547c70a5803c0e4
parente2baad9e4b153c67dddc5ccf987395b842329c84
tcp/dccp: warn user for preferred ip_local_port_range

After commit 07f4c90062f8f ("tcp/dccp: try to not exhaust
ip_local_port_range in connect()") it is advised to have an even number
of ports described in /proc/sys/net/ipv4/ip_local_port_range

This means start/end values should have a different parity.

Let's warn sysadmins of this, so that they can update their settings
if they want to.

Suggested-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/netns/ipv4.h
net/ipv4/sysctl_net_ipv4.c