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> |
| 17 | #include <net/ip.h> |
| 18 | |
| 19 | static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops, |
| 20 | struct sk_buff *skb, |
| 21 | const struct net_device *in, |
| 22 | const struct net_device *out, |
| 23 | int (*okfn)(struct sk_buff *)) |
| 24 | { |
| 25 | if (unlikely(skb->len < sizeof(struct iphdr) || |
| 26 | ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) { |
| 27 | if (net_ratelimit()) |
| 28 | pr_info("nf_tables_ipv4: ignoring short SOCK_RAW " |
| 29 | "packet\n"); |
| 30 | return NF_ACCEPT; |
| 31 | } |
| 32 | |
| 33 | return nft_do_chain(ops, skb, in, out, okfn); |
| 34 | } |
| 35 | |
| 36 | static struct nft_af_info nft_af_ipv4 __read_mostly = { |
| 37 | .family = NFPROTO_IPV4, |
| 38 | .nhooks = NF_INET_NUMHOOKS, |
| 39 | .owner = THIS_MODULE, |
| 40 | .hooks = { |
| 41 | [NF_INET_LOCAL_OUT] = nft_ipv4_output, |
| 42 | }, |
| 43 | }; |
| 44 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame^] | 45 | static struct nf_chain_type filter_ipv4 = { |
| 46 | .family = NFPROTO_IPV4, |
| 47 | .name = "filter", |
| 48 | .type = NFT_CHAIN_T_DEFAULT, |
| 49 | .hook_mask = (1 << NF_INET_LOCAL_IN) | |
| 50 | (1 << NF_INET_LOCAL_OUT) | |
| 51 | (1 << NF_INET_FORWARD) | |
| 52 | (1 << NF_INET_PRE_ROUTING) | |
| 53 | (1 << NF_INET_POST_ROUTING), |
| 54 | .fn = { |
| 55 | [NF_INET_LOCAL_IN] = nft_do_chain, |
| 56 | [NF_INET_LOCAL_OUT] = nft_do_chain, |
| 57 | [NF_INET_FORWARD] = nft_do_chain, |
| 58 | [NF_INET_PRE_ROUTING] = nft_do_chain, |
| 59 | [NF_INET_POST_ROUTING] = nft_do_chain, |
| 60 | }, |
| 61 | }; |
| 62 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 63 | static int __init nf_tables_ipv4_init(void) |
| 64 | { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame^] | 65 | nft_register_chain_type(&filter_ipv4); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 66 | return nft_register_afinfo(&nft_af_ipv4); |
| 67 | } |
| 68 | |
| 69 | static void __exit nf_tables_ipv4_exit(void) |
| 70 | { |
| 71 | nft_unregister_afinfo(&nft_af_ipv4); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame^] | 72 | nft_unregister_chain_type(&filter_ipv4); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | module_init(nf_tables_ipv4_init); |
| 76 | module_exit(nf_tables_ipv4_exit); |
| 77 | |
| 78 | MODULE_LICENSE("GPL"); |
| 79 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 80 | MODULE_ALIAS_NFT_FAMILY(AF_INET); |