| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 211/241] netfilter: nf_nat: don't check for port change on ICMP tuples | Date | Thu, 13 Dec 2012 11:59:36 -0200 |
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3.5.7.2 -stable review patch. If anyone has any objections, please let me know.
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From: Ulrich Weber <ulrich.weber@sophos.com>
commit 38fe36a248ec3228f8e6507955d7ceb0432d2000 upstream.
ICMP tuples have id in src and type/code in dst. So comparing src.u.all with dst.u.all will always fail here and ip_xfrm_me_harder() is called for every ICMP packet, even if there was no NAT.
This patch is a backport of:
[ 38fe36a netfilter: nf_nat: don't check for port change on ICMP tuples ]
Signed-off-by: Ulrich Weber <ulrich.weber@sophos.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- net/ipv4/netfilter/nf_nat_standalone.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c index 3828a42..da4098f 100644 --- a/net/ipv4/netfilter/nf_nat_standalone.c +++ b/net/ipv4/netfilter/nf_nat_standalone.c @@ -194,7 +194,8 @@ nf_nat_out(unsigned int hooknum, if ((ct->tuplehash[dir].tuple.src.u3.ip != ct->tuplehash[!dir].tuple.dst.u3.ip) || - (ct->tuplehash[dir].tuple.src.u.all != + (ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP && + ct->tuplehash[dir].tuple.src.u.all != ct->tuplehash[!dir].tuple.dst.u.all) ) return ip_xfrm_me_harder(skb) == 0 ? ret : NF_DROP; @@ -230,7 +231,8 @@ nf_nat_local_fn(unsigned int hooknum, ret = NF_DROP; } #ifdef CONFIG_XFRM - else if (ct->tuplehash[dir].tuple.dst.u.all != + else if (ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP && + ct->tuplehash[dir].tuple.dst.u.all != ct->tuplehash[!dir].tuple.src.u.all) if (ip_xfrm_me_harder(skb)) ret = NF_DROP; -- 1.7.9.5
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