2 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2012-2013 Pablo Neira Ayuso <pablo@netfilter.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Development of this code funded by Astaro AG (http://www.astaro.com/)
12 #include <linux/init.h>
13 #include <linux/module.h>
15 #include <linux/netfilter_ipv4.h>
16 #include <net/netfilter/nf_tables.h>
17 #include <net/net_namespace.h>
19 #include <net/netfilter/nf_tables_ipv4.h>
21 static unsigned int nft_do_chain_ipv4(void *priv,
23 const struct nf_hook_state *state)
25 struct nft_pktinfo pkt;
27 nft_set_pktinfo_ipv4(&pkt, skb, state);
29 return nft_do_chain(&pkt, priv);
32 static unsigned int nft_ipv4_output(void *priv,
34 const struct nf_hook_state *state)
36 if (unlikely(skb->len < sizeof(struct iphdr) ||
37 ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) {
39 pr_info("nf_tables_ipv4: ignoring short SOCK_RAW "
44 return nft_do_chain_ipv4(priv, skb, state);
47 struct nft_af_info nft_af_ipv4 __read_mostly = {
48 .family = NFPROTO_IPV4,
49 .nhooks = NF_INET_NUMHOOKS,
53 [NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
54 [NF_INET_LOCAL_OUT] = nft_ipv4_output,
55 [NF_INET_FORWARD] = nft_do_chain_ipv4,
56 [NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
57 [NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
60 EXPORT_SYMBOL_GPL(nft_af_ipv4);
62 static int nf_tables_ipv4_init_net(struct net *net)
64 net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
65 if (net->nft.ipv4 == NULL)
68 memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4));
70 if (nft_register_afinfo(net, net->nft.ipv4) < 0)
79 static void nf_tables_ipv4_exit_net(struct net *net)
81 nft_unregister_afinfo(net, net->nft.ipv4);
85 static struct pernet_operations nf_tables_ipv4_net_ops = {
86 .init = nf_tables_ipv4_init_net,
87 .exit = nf_tables_ipv4_exit_net,
90 static const struct nf_chain_type filter_ipv4 = {
92 .type = NFT_CHAIN_T_DEFAULT,
93 .family = NFPROTO_IPV4,
95 .hook_mask = (1 << NF_INET_LOCAL_IN) |
96 (1 << NF_INET_LOCAL_OUT) |
97 (1 << NF_INET_FORWARD) |
98 (1 << NF_INET_PRE_ROUTING) |
99 (1 << NF_INET_POST_ROUTING),
102 static int __init nf_tables_ipv4_init(void)
106 ret = nft_register_chain_type(&filter_ipv4);
110 ret = register_pernet_subsys(&nf_tables_ipv4_net_ops);
112 nft_unregister_chain_type(&filter_ipv4);
117 static void __exit nf_tables_ipv4_exit(void)
119 unregister_pernet_subsys(&nf_tables_ipv4_net_ops);
120 nft_unregister_chain_type(&filter_ipv4);
123 module_init(nf_tables_ipv4_init);
124 module_exit(nf_tables_ipv4_exit);
126 MODULE_LICENSE("GPL");
127 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
128 MODULE_ALIAS_NFT_FAMILY(AF_INET);