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96518518 PM |
1 | /* |
2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> | |
9370761c | 3 | * Copyright (c) 2012-2013 Pablo Neira Ayuso <pablo@netfilter.org> |
96518518 PM |
4 | * |
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. | |
8 | * | |
9 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
10 | */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/ip.h> | |
15 | #include <linux/netfilter_ipv4.h> | |
16 | #include <net/netfilter/nf_tables.h> | |
99633ab2 | 17 | #include <net/net_namespace.h> |
96518518 | 18 | #include <net/ip.h> |
0ca743a5 | 19 | #include <net/netfilter/nf_tables_ipv4.h> |
96518518 | 20 | |
06198b34 | 21 | static unsigned int nft_do_chain_ipv4(void *priv, |
3b088c4b | 22 | struct sk_buff *skb, |
238e54c9 | 23 | const struct nf_hook_state *state) |
3b088c4b PM |
24 | { |
25 | struct nft_pktinfo pkt; | |
26 | ||
6aa187f2 | 27 | nft_set_pktinfo_ipv4(&pkt, skb, state); |
3b088c4b | 28 | |
06198b34 | 29 | return nft_do_chain(&pkt, priv); |
3b088c4b PM |
30 | } |
31 | ||
06198b34 | 32 | static unsigned int nft_ipv4_output(void *priv, |
96518518 | 33 | struct sk_buff *skb, |
238e54c9 | 34 | const struct nf_hook_state *state) |
96518518 PM |
35 | { |
36 | if (unlikely(skb->len < sizeof(struct iphdr) || | |
37 | ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) { | |
38 | if (net_ratelimit()) | |
39 | pr_info("nf_tables_ipv4: ignoring short SOCK_RAW " | |
40 | "packet\n"); | |
41 | return NF_ACCEPT; | |
42 | } | |
43 | ||
06198b34 | 44 | return nft_do_chain_ipv4(priv, skb, state); |
96518518 PM |
45 | } |
46 | ||
1d49144c | 47 | struct nft_af_info nft_af_ipv4 __read_mostly = { |
96518518 PM |
48 | .family = NFPROTO_IPV4, |
49 | .nhooks = NF_INET_NUMHOOKS, | |
50 | .owner = THIS_MODULE, | |
115a60b1 | 51 | .nops = 1, |
96518518 | 52 | .hooks = { |
3b088c4b | 53 | [NF_INET_LOCAL_IN] = nft_do_chain_ipv4, |
96518518 | 54 | [NF_INET_LOCAL_OUT] = nft_ipv4_output, |
3b088c4b PM |
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, | |
96518518 PM |
58 | }, |
59 | }; | |
1d49144c | 60 | EXPORT_SYMBOL_GPL(nft_af_ipv4); |
96518518 | 61 | |
99633ab2 PNA |
62 | static int nf_tables_ipv4_init_net(struct net *net) |
63 | { | |
64 | net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL); | |
65 | if (net->nft.ipv4 == NULL) | |
66 | return -ENOMEM; | |
67 | ||
68 | memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4)); | |
69 | ||
70 | if (nft_register_afinfo(net, net->nft.ipv4) < 0) | |
71 | goto err; | |
72 | ||
73 | return 0; | |
74 | err: | |
75 | kfree(net->nft.ipv4); | |
76 | return -ENOMEM; | |
77 | } | |
78 | ||
79 | static void nf_tables_ipv4_exit_net(struct net *net) | |
80 | { | |
81 | nft_unregister_afinfo(net->nft.ipv4); | |
82 | kfree(net->nft.ipv4); | |
83 | } | |
84 | ||
85 | static struct pernet_operations nf_tables_ipv4_net_ops = { | |
86 | .init = nf_tables_ipv4_init_net, | |
87 | .exit = nf_tables_ipv4_exit_net, | |
88 | }; | |
0ca743a5 | 89 | |
2a37d755 | 90 | static const struct nf_chain_type filter_ipv4 = { |
9370761c PNA |
91 | .name = "filter", |
92 | .type = NFT_CHAIN_T_DEFAULT, | |
fa2c1de0 PM |
93 | .family = NFPROTO_IPV4, |
94 | .owner = THIS_MODULE, | |
9370761c PNA |
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), | |
9370761c PNA |
100 | }; |
101 | ||
96518518 PM |
102 | static int __init nf_tables_ipv4_init(void) |
103 | { | |
cf4dfa85 PNA |
104 | int ret; |
105 | ||
9370761c | 106 | nft_register_chain_type(&filter_ipv4); |
cf4dfa85 PNA |
107 | ret = register_pernet_subsys(&nf_tables_ipv4_net_ops); |
108 | if (ret < 0) | |
109 | nft_unregister_chain_type(&filter_ipv4); | |
110 | ||
111 | return ret; | |
96518518 PM |
112 | } |
113 | ||
114 | static void __exit nf_tables_ipv4_exit(void) | |
115 | { | |
99633ab2 | 116 | unregister_pernet_subsys(&nf_tables_ipv4_net_ops); |
9370761c | 117 | nft_unregister_chain_type(&filter_ipv4); |
96518518 PM |
118 | } |
119 | ||
120 | module_init(nf_tables_ipv4_init); | |
121 | module_exit(nf_tables_ipv4_exit); | |
122 | ||
123 | MODULE_LICENSE("GPL"); | |
124 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
125 | MODULE_ALIAS_NFT_FAMILY(AF_INET); |