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 int __net_init iptable_raw_table_init(struct net *net);
15 static const struct xt_table packet_raw = {
17 .valid_hooks = RAW_VALID_HOOKS,
20 .priority = NF_IP_PRI_RAW,
21 .table_init = iptable_raw_table_init,
24 /* The work comes in here from netfilter.c. */
26 iptable_raw_hook(void *priv, struct sk_buff *skb,
27 const struct nf_hook_state *state)
29 if (state->hook == NF_INET_LOCAL_OUT &&
30 (skb->len < sizeof(struct iphdr) ||
31 ip_hdrlen(skb) < sizeof(struct iphdr)))
32 /* root is playing with raw sockets. */
35 return ipt_do_table(skb, state, state->net->ipv4.iptable_raw);
38 static struct nf_hook_ops *rawtable_ops __read_mostly;
40 static int __net_init iptable_raw_table_init(struct net *net)
42 struct ipt_replace *repl;
45 if (net->ipv4.iptable_raw)
48 repl = ipt_alloc_initial_table(&packet_raw);
51 ret = ipt_register_table(net, &packet_raw, repl, rawtable_ops,
52 &net->ipv4.iptable_raw);
57 static void __net_exit iptable_raw_net_exit(struct net *net)
59 if (!net->ipv4.iptable_raw)
61 ipt_unregister_table(net, net->ipv4.iptable_raw, rawtable_ops);
62 net->ipv4.iptable_raw = NULL;
65 static struct pernet_operations iptable_raw_net_ops = {
66 .exit = iptable_raw_net_exit,
69 static int __init iptable_raw_init(void)
73 rawtable_ops = xt_hook_ops_alloc(&packet_raw, iptable_raw_hook);
74 if (IS_ERR(rawtable_ops))
75 return PTR_ERR(rawtable_ops);
77 ret = register_pernet_subsys(&iptable_raw_net_ops);
83 ret = iptable_raw_table_init(&init_net);
85 unregister_pernet_subsys(&iptable_raw_net_ops);
92 static void __exit iptable_raw_fini(void)
94 unregister_pernet_subsys(&iptable_raw_net_ops);
98 module_init(iptable_raw_init);
99 module_exit(iptable_raw_fini);
100 MODULE_LICENSE("GPL");