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[NETFILTER]: xt_pkttype: fix mismatches on locally generated packets 

Locally generated broadcast and multicast packets have pkttype set to
PACKET_LOOPBACK instead of PACKET_BROADCAST or PACKET_MULTICAST. This
causes the pkttype match to fail to match packets of either type.

The below patch remedies this by using the daddr as a hint as to
broadcast|multicast. While not pretty, this seems like the only way
to solve the problem short of just noting this as a limitation of the
match.

This resolves netfilter bugzilla #484

Signed-off-by: Phil Oester <kernel@linuxace.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Phil Oester 2006-07-24 22:54:14 -07:00 committed by David S. Miller
parent 8cf8fb5687
commit 28658c8967
1 changed files with 11 additions and 1 deletions
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12
net/netfilter/xt_pkttype.c
View File

@ -9,6 +9,8 @@
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/netfilter/xt_pkttype.h>
#include <linux/netfilter/x_tables.h>
@ -28,9 +30,17 @@ static int match(const struct sk_buff *skb,
unsigned int protoff,
int *hotdrop)
{
u_int8_t type;
const struct xt_pkttype_info *info = matchinfo;
return (skb->pkt_type == info->pkttype) ^ info->invert;
if (skb->pkt_type == PACKET_LOOPBACK)
type = (MULTICAST(skb->nh.iph->daddr)
? PACKET_MULTICAST
: PACKET_BROADCAST);
else
type = skb->pkt_type;
return (type == info->pkttype) ^ info->invert;
}
static struct xt_match pkttype_match = {