tree 2c9e372601ba794894833b0618bc531a9f5d57c4
parent 06393009000779b00a558fd2f280882cc7dc2008
author Stephen Hemminger <shemminger@linux-foundation.org> 1192062646 -0700
committer David S. Miller <davem@davemloft.net> 1192062646 -0700

[INET]: local port range robustness

Expansion of original idea from Denis V. Lunev <den@openvz.org>

Add robustness and locking to the local_port_range sysctl.
1. Enforce that low < high when setting.
2. Use seqlock to ensure atomic update.

The locking might seem like overkill, but there are
cases where sysadmin might want to change value in the
middle of a DoS attack.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>