diff options
| author | Patrick McHardy <kaber@trash.net> | 2007-05-10 14:17:36 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-05-10 23:47:59 -0700 |
| commit | 802169a4b0f71d25a0f798a9c0657a565b1e79bc (patch) | |
| tree | ec2f1f9906463da2c00d351b2bfb6814a57246c2 | |
| parent | 4a176c1a61ed279f4d98b6adf9be84fb905d921c (diff) | |
[NETFILTER]: iptable_raw: ignore short packets sent by SOCK_RAW sockets
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>
| -rw-r--r-- | net/ipv4/netfilter/iptable_raw.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/net/ipv4/netfilter/iptable_raw.c b/net/ipv4/netfilter/iptable_raw.c index f7d28fd748e..d6e50339568 100644 --- a/net/ipv4/netfilter/iptable_raw.c +++ b/net/ipv4/netfilter/iptable_raw.c @@ -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, |