[EBTABLES] Don't match tcp/udp source/destination port for IP fragments

Signed-off-by: Bart De Schuymer <bdschuym@pandora.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/bridge/netfilter/ebt_ip.c b/net/bridge/netfilter/ebt_ip.c
index 7323805b9726..f158fe67dd60 100644
--- a/net/bridge/netfilter/ebt_ip.c
+++ b/net/bridge/netfilter/ebt_ip.c
@@ -15,6 +15,7 @@
 #include <linux/netfilter_bridge/ebtables.h>
 #include <linux/netfilter_bridge/ebt_ip.h>
 #include <linux/ip.h>
+#include <net/ip.h>
 #include <linux/in.h>
 #include <linux/module.h>
 
@@ -51,6 +52,8 @@ static int ebt_filter_ip(const struct sk_buff *skb, const struct net_device *in,
                 if (!(info->bitmask & EBT_IP_DPORT) &&
                     !(info->bitmask & EBT_IP_SPORT))
                         return EBT_MATCH;
+                if (ntohs(ih->frag_off) & IP_OFFSET)
+                        return EBT_NOMATCH;
                 pptr = skb_header_pointer(skb, ih->ihl*4,
                                           sizeof(_ports), &_ports);
                 if (pptr == NULL)