From: Florian Westphal Date: Mon, 4 Apr 2011 15:06:21 +0000 (+0200) Subject: netfilter: xt_conntrack: fix inverted conntrack direction test X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=96120d86fe302c006259baee9061eea9e1b9e486;p=linux-beck.git netfilter: xt_conntrack: fix inverted conntrack direction test --ctdir ORIGINAL matches REPLY packets, and vv: userspace sets "invert_flags &= ~XT_CONNTRACK_DIRECTION" in ORIGINAL case. Thus: (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) ^ !!(info->invert_flags & XT_CONNTRACK_DIRECTION)) yields "1 ^ 0", which is true -> returns false. Reproducer: iptables -I OUTPUT 1 -p tcp --syn -m conntrack --ctdir ORIGINAL Signed-off-by: Florian Westphal Signed-off-by: Patrick McHardy --- diff --git a/net/netfilter/xt_conntrack.c b/net/netfilter/xt_conntrack.c index 2c0086a4751e..481a86fdc409 100644 --- a/net/netfilter/xt_conntrack.c +++ b/net/netfilter/xt_conntrack.c @@ -195,7 +195,7 @@ conntrack_mt(const struct sk_buff *skb, struct xt_action_param *par, return info->match_flags & XT_CONNTRACK_STATE; if ((info->match_flags & XT_CONNTRACK_DIRECTION) && (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) ^ - !!(info->invert_flags & XT_CONNTRACK_DIRECTION)) + !(info->invert_flags & XT_CONNTRACK_DIRECTION)) return false; if (info->match_flags & XT_CONNTRACK_ORIGSRC)