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_ipv4_output(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 if (unlikely(skb->len < sizeof(struct iphdr) ||
30 ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) {
32 pr_info("nf_tables_ipv4: ignoring short SOCK_RAW "
36 nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
38 return nft_do_chain_pktinfo(&pkt, ops);
41 static struct nft_af_info nft_af_ipv4 __read_mostly = {
42 .family = NFPROTO_IPV4,
43 .nhooks = NF_INET_NUMHOOKS,
46 [NF_INET_LOCAL_OUT] = nft_ipv4_output,
50 static int nf_tables_ipv4_init_net(struct net *net)
52 net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
53 if (net->nft.ipv4 == NULL)
56 memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4));
58 if (nft_register_afinfo(net, net->nft.ipv4) < 0)
67 static void nf_tables_ipv4_exit_net(struct net *net)
69 nft_unregister_afinfo(net->nft.ipv4);
73 static struct pernet_operations nf_tables_ipv4_net_ops = {
74 .init = nf_tables_ipv4_init_net,
75 .exit = nf_tables_ipv4_exit_net,
79 nft_do_chain_ipv4(const struct nf_hook_ops *ops,
81 const struct net_device *in,
82 const struct net_device *out,
83 int (*okfn)(struct sk_buff *))
85 struct nft_pktinfo pkt;
87 nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
89 return nft_do_chain_pktinfo(&pkt, ops);
92 static struct nf_chain_type filter_ipv4 = {
93 .family = NFPROTO_IPV4,
95 .type = NFT_CHAIN_T_DEFAULT,
96 .hook_mask = (1 << NF_INET_LOCAL_IN) |
97 (1 << NF_INET_LOCAL_OUT) |
98 (1 << NF_INET_FORWARD) |
99 (1 << NF_INET_PRE_ROUTING) |
100 (1 << NF_INET_POST_ROUTING),
102 [NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
103 [NF_INET_LOCAL_OUT] = nft_ipv4_output,
104 [NF_INET_FORWARD] = nft_do_chain_ipv4,
105 [NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
106 [NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
110 static int __init nf_tables_ipv4_init(void)
112 nft_register_chain_type(&filter_ipv4);
113 return register_pernet_subsys(&nf_tables_ipv4_net_ops);
116 static void __exit nf_tables_ipv4_exit(void)
118 unregister_pernet_subsys(&nf_tables_ipv4_net_ops);
119 nft_unregister_chain_type(&filter_ipv4);
122 module_init(nf_tables_ipv4_init);
123 module_exit(nf_tables_ipv4_exit);
125 MODULE_LICENSE("GPL");
126 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
127 MODULE_ALIAS_NFT_FAMILY(AF_INET);