tree 2d6be092933a6540dce90a36c10548859f09cc9e
parent 37bc4f8dfa72fb43b84381abca39cfdbbc8ff2df
author Phil Oester <kernel@linuxace.com> 1370322567 +0000
committer Pablo Neira Ayuso <pablo@netfilter.org> 1370433562 +0200

netfilter: xt_TCPMSS: Fix violation of RFC879 in absence of MSS option

The clamp-mss-to-pmtu option of the xt_TCPMSS target can cause issues
connecting to websites if there was no MSS option present in the
original SYN packet from the client. In these cases, it may add a
MSS higher than the default specified in RFC879. Fix this by never
setting a value > 536 if no MSS option was specified by the client.

This closes netfilter's bugzilla #662.

Signed-off-by: Phil Oester <kernel@linuxace.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>