2 * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
4 * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
6 #include <linux/module.h>
7 #include <linux/netfilter_ipv4/ip_tables.h>
8 #include <linux/slab.h>
11 #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
13 static const struct xt_table packet_raw = {
15 .valid_hooks = RAW_VALID_HOOKS,
18 .priority = NF_IP_PRI_RAW,
21 /* The work comes in here from netfilter.c. */
23 iptable_raw_hook(void *priv, struct sk_buff *skb,
24 const struct nf_hook_state *state)
26 if (state->hook == NF_INET_LOCAL_OUT &&
27 (skb->len < sizeof(struct iphdr) ||
28 ip_hdrlen(skb) < sizeof(struct iphdr)))
29 /* root is playing with raw sockets. */
32 return ipt_do_table(skb, state, state->net->ipv4.iptable_raw);
35 static struct nf_hook_ops *rawtable_ops __read_mostly;
37 static int __net_init iptable_raw_net_init(struct net *net)
39 struct ipt_replace *repl;
41 repl = ipt_alloc_initial_table(&packet_raw);
44 net->ipv4.iptable_raw =
45 ipt_register_table(net, &packet_raw, repl);
47 return PTR_ERR_OR_ZERO(net->ipv4.iptable_raw);
50 static void __net_exit iptable_raw_net_exit(struct net *net)
52 ipt_unregister_table(net, net->ipv4.iptable_raw);
55 static struct pernet_operations iptable_raw_net_ops = {
56 .init = iptable_raw_net_init,
57 .exit = iptable_raw_net_exit,
60 static int __init iptable_raw_init(void)
64 ret = register_pernet_subsys(&iptable_raw_net_ops);
69 rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook);
70 if (IS_ERR(rawtable_ops)) {
71 ret = PTR_ERR(rawtable_ops);
72 unregister_pernet_subsys(&iptable_raw_net_ops);
78 static void __exit iptable_raw_fini(void)
80 xt_hook_unlink(&packet_raw, rawtable_ops);
81 unregister_pernet_subsys(&iptable_raw_net_ops);
84 module_init(iptable_raw_init);
85 module_exit(iptable_raw_fini);
86 MODULE_LICENSE("GPL");