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- /*
- * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
- *
- * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
- */
- #include <linux/module.h>
- #include <linux/netfilter_ipv4/ip_tables.h>
- #include <linux/slab.h>
- #include <net/ip.h>
- #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
- static const struct xt_table packet_raw = {
- .name = "raw",
- .valid_hooks = RAW_VALID_HOOKS,
- .me = THIS_MODULE,
- .af = NFPROTO_IPV4,
- .priority = NF_IP_PRI_RAW,
- };
- /* The work comes in here from netfilter.c. */
- static unsigned int
- iptable_raw_hook(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state)
- {
- if (state->hook == NF_INET_LOCAL_OUT &&
- (skb->len < sizeof(struct iphdr) ||
- ip_hdrlen(skb) < sizeof(struct iphdr)))
- /* root is playing with raw sockets. */
- return NF_ACCEPT;
- return ipt_do_table(skb, state, state->net->ipv4.iptable_raw);
- }
- static struct nf_hook_ops *rawtable_ops __read_mostly;
- static int __net_init iptable_raw_net_init(struct net *net)
- {
- struct ipt_replace *repl;
- repl = ipt_alloc_initial_table(&packet_raw);
- if (repl == NULL)
- return -ENOMEM;
- net->ipv4.iptable_raw =
- ipt_register_table(net, &packet_raw, repl);
- kfree(repl);
- return PTR_ERR_OR_ZERO(net->ipv4.iptable_raw);
- }
- static void __net_exit iptable_raw_net_exit(struct net *net)
- {
- ipt_unregister_table(net, net->ipv4.iptable_raw);
- }
- static struct pernet_operations iptable_raw_net_ops = {
- .init = iptable_raw_net_init,
- .exit = iptable_raw_net_exit,
- };
- static int __init iptable_raw_init(void)
- {
- int ret;
- ret = register_pernet_subsys(&iptable_raw_net_ops);
- if (ret < 0)
- return ret;
- /* Register hooks */
- rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook);
- if (IS_ERR(rawtable_ops)) {
- ret = PTR_ERR(rawtable_ops);
- unregister_pernet_subsys(&iptable_raw_net_ops);
- }
- return ret;
- }
- static void __exit iptable_raw_fini(void)
- {
- xt_hook_unlink(&packet_raw, rawtable_ops);
- unregister_pernet_subsys(&iptable_raw_net_ops);
- }
- module_init(iptable_raw_init);
- module_exit(iptable_raw_fini);
- MODULE_LICENSE("GPL");
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