Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 3 | * Copyright (c) 2012-2013 Pablo Neira Ayuso <pablo@netfilter.org> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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> |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 17 | #include <net/net_namespace.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 18 | #include <net/ip.h> |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 19 | #include <net/netfilter/nf_tables_ipv4.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 20 | |
Patrick McHardy | 3b088c4 | 2014-01-03 12:16:13 +0000 | [diff] [blame] | 21 | static unsigned int nft_do_chain_ipv4(const struct nf_hook_ops *ops, |
| 22 | struct sk_buff *skb, |
| 23 | const struct net_device *in, |
| 24 | const struct net_device *out, |
| 25 | int (*okfn)(struct sk_buff *)) |
| 26 | { |
| 27 | struct nft_pktinfo pkt; |
| 28 | |
| 29 | nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out); |
| 30 | |
Patrick McHardy | 3876d22 | 2014-01-09 18:42:43 +0000 | [diff] [blame] | 31 | return nft_do_chain(&pkt, ops); |
Patrick McHardy | 3b088c4 | 2014-01-03 12:16:13 +0000 | [diff] [blame] | 32 | } |
| 33 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 34 | static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops, |
| 35 | struct sk_buff *skb, |
| 36 | const struct net_device *in, |
| 37 | const struct net_device *out, |
| 38 | int (*okfn)(struct sk_buff *)) |
| 39 | { |
| 40 | if (unlikely(skb->len < sizeof(struct iphdr) || |
| 41 | ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) { |
| 42 | if (net_ratelimit()) |
| 43 | pr_info("nf_tables_ipv4: ignoring short SOCK_RAW " |
| 44 | "packet\n"); |
| 45 | return NF_ACCEPT; |
| 46 | } |
| 47 | |
Patrick McHardy | 3b088c4 | 2014-01-03 12:16:13 +0000 | [diff] [blame] | 48 | return nft_do_chain_ipv4(ops, skb, in, out, okfn); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 49 | } |
| 50 | |
Patrick McHardy | 1d49144 | 2014-01-03 12:16:16 +0000 | [diff] [blame] | 51 | struct nft_af_info nft_af_ipv4 __read_mostly = { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 52 | .family = NFPROTO_IPV4, |
| 53 | .nhooks = NF_INET_NUMHOOKS, |
| 54 | .owner = THIS_MODULE, |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 55 | .nops = 1, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 56 | .hooks = { |
Patrick McHardy | 3b088c4 | 2014-01-03 12:16:13 +0000 | [diff] [blame] | 57 | [NF_INET_LOCAL_IN] = nft_do_chain_ipv4, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 58 | [NF_INET_LOCAL_OUT] = nft_ipv4_output, |
Patrick McHardy | 3b088c4 | 2014-01-03 12:16:13 +0000 | [diff] [blame] | 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, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 62 | }, |
| 63 | }; |
Patrick McHardy | 1d49144 | 2014-01-03 12:16:16 +0000 | [diff] [blame] | 64 | EXPORT_SYMBOL_GPL(nft_af_ipv4); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 65 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 66 | static int nf_tables_ipv4_init_net(struct net *net) |
| 67 | { |
| 68 | net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL); |
| 69 | if (net->nft.ipv4 == NULL) |
| 70 | return -ENOMEM; |
| 71 | |
| 72 | memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4)); |
| 73 | |
| 74 | if (nft_register_afinfo(net, net->nft.ipv4) < 0) |
| 75 | goto err; |
| 76 | |
| 77 | return 0; |
| 78 | err: |
| 79 | kfree(net->nft.ipv4); |
| 80 | return -ENOMEM; |
| 81 | } |
| 82 | |
| 83 | static void nf_tables_ipv4_exit_net(struct net *net) |
| 84 | { |
| 85 | nft_unregister_afinfo(net->nft.ipv4); |
| 86 | kfree(net->nft.ipv4); |
| 87 | } |
| 88 | |
| 89 | static struct pernet_operations nf_tables_ipv4_net_ops = { |
| 90 | .init = nf_tables_ipv4_init_net, |
| 91 | .exit = nf_tables_ipv4_exit_net, |
| 92 | }; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 93 | |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 94 | static const struct nf_chain_type filter_ipv4 = { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 95 | .name = "filter", |
| 96 | .type = NFT_CHAIN_T_DEFAULT, |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 97 | .family = NFPROTO_IPV4, |
| 98 | .owner = THIS_MODULE, |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 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), |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 104 | }; |
| 105 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 106 | static int __init nf_tables_ipv4_init(void) |
| 107 | { |
Pablo Neira Ayuso | cf4dfa8 | 2014-01-09 20:32:19 +0100 | [diff] [blame] | 108 | int ret; |
| 109 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 110 | nft_register_chain_type(&filter_ipv4); |
Pablo Neira Ayuso | cf4dfa8 | 2014-01-09 20:32:19 +0100 | [diff] [blame] | 111 | ret = register_pernet_subsys(&nf_tables_ipv4_net_ops); |
| 112 | if (ret < 0) |
| 113 | nft_unregister_chain_type(&filter_ipv4); |
| 114 | |
| 115 | return ret; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | static void __exit nf_tables_ipv4_exit(void) |
| 119 | { |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 120 | unregister_pernet_subsys(&nf_tables_ipv4_net_ops); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 121 | nft_unregister_chain_type(&filter_ipv4); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | module_init(nf_tables_ipv4_init); |
| 125 | module_exit(nf_tables_ipv4_exit); |
| 126 | |
| 127 | MODULE_LICENSE("GPL"); |
| 128 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 129 | MODULE_ALIAS_NFT_FAMILY(AF_INET); |