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[NETFILTER]: iptable_raw: ignore short packets sent by SOCK_RAW sockets

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iptables matches and targets expect packets to have at least a full
IP header and a valid header length. Ignore packets sent through
raw sockets for which this isn't true as in the other tables.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-05-10 14:17:36 -07:00 committed by David S. Miller
parent 4a176c1a61
commit 802169a4b0
1 changed files with 20 additions and 1 deletions
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21
net/ipv4/netfilter/iptable_raw.c
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@ -5,6 +5,7 @@
*/
#include <linux/module.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <net/ip.h>
#define RAW_VALID_HOOKS ((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT))
@ -54,6 +55,24 @@ ipt_hook(unsigned int hook,
return ipt_do_table(pskb, hook, in, out, &packet_raw);
}
static unsigned int
ipt_local_hook(unsigned int hook,
struct sk_buff **pskb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
/* root is playing with raw sockets. */
if ((*pskb)->len < sizeof(struct iphdr) ||
ip_hdrlen(*pskb) < sizeof(struct iphdr)) {
if (net_ratelimit())
printk("iptable_raw: ignoring short SOCK_RAW"
"packet.\n");
return NF_ACCEPT;
}
return ipt_do_table(pskb, hook, in, out, &packet_raw);
}
/* 'raw' is the very first table. */
static struct nf_hook_ops ipt_ops[] = {
{
@ -64,7 +83,7 @@ static struct nf_hook_ops ipt_ops[] = {
.owner = THIS_MODULE,
},
{
.hook = ipt_hook,
.hook = ipt_local_hook,
.pf = PF_INET,
.hooknum = NF_IP_LOCAL_OUT,
.priority = NF_IP_PRI_RAW,