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
);