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(const struct nf_hook_ops *ops,
23 const struct net_device *in,
24 const struct net_device *out,
25 int (*okfn)(struct sk_buff *))
27 struct nft_pktinfo pkt;
29 nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
31 return nft_do_chain(&pkt, ops);
34 static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops,
36 const struct net_device *in,
37 const struct net_device *out,
38 int (*okfn)(struct sk_buff *))
40 if (unlikely(skb->len < sizeof(struct iphdr) ||
41 ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) {
43 pr_info("nf_tables_ipv4: ignoring short SOCK_RAW "
48 return nft_do_chain_ipv4(ops, skb, in, out, okfn);
51 struct nft_af_info nft_af_ipv4 __read_mostly = {
52 .family = NFPROTO_IPV4,
53 .nhooks = NF_INET_NUMHOOKS,
57 [NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
58 [NF_INET_LOCAL_OUT] = nft_ipv4_output,
59 [NF_INET_FORWARD] = nft_do_chain_ipv4,
60 [NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
61 [NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
64 EXPORT_SYMBOL_GPL(nft_af_ipv4);
66 static int nf_tables_ipv4_init_net(struct net *net)
68 net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
69 if (net->nft.ipv4 == NULL)
72 memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4));
74 if (nft_register_afinfo(net, net->nft.ipv4) < 0)
83 static void nf_tables_ipv4_exit_net(struct net *net)
85 nft_unregister_afinfo(net->nft.ipv4);
89 static struct pernet_operations nf_tables_ipv4_net_ops = {
90 .init = nf_tables_ipv4_init_net,
91 .exit = nf_tables_ipv4_exit_net,
94 static const struct nf_chain_type filter_ipv4 = {
96 .type = NFT_CHAIN_T_DEFAULT,
97 .family = NFPROTO_IPV4,
99 .hook_mask = (1 << NF_INET_LOCAL_IN) |
100 (1 << NF_INET_LOCAL_OUT) |
101 (1 << NF_INET_FORWARD) |
102 (1 << NF_INET_PRE_ROUTING) |
103 (1 << NF_INET_POST_ROUTING),
106 static int __init nf_tables_ipv4_init(void)
110 nft_register_chain_type(&filter_ipv4);
111 ret = register_pernet_subsys(&nf_tables_ipv4_net_ops);
113 nft_unregister_chain_type(&filter_ipv4);
118 static void __exit nf_tables_ipv4_exit(void)
120 unregister_pernet_subsys(&nf_tables_ipv4_net_ops);
121 nft_unregister_chain_type(&filter_ipv4);
124 module_init(nf_tables_ipv4_init);
125 module_exit(nf_tables_ipv4_exit);
127 MODULE_LICENSE("GPL");
128 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
129 MODULE_ALIAS_NFT_FAMILY(AF_INET);