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> |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame^] | 18 | #include <net/net_namespace.h> |
| 19 | #include <net/netfilter/nf_tables_ipv4.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 20 | |
| 21 | static unsigned int nft_ipv4_output(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 | { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame^] | 27 | struct nft_pktinfo pkt; |
| 28 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 29 | if (unlikely(skb->len < sizeof(struct iphdr) || |
| 30 | ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) { |
| 31 | if (net_ratelimit()) |
| 32 | pr_info("nf_tables_ipv4: ignoring short SOCK_RAW " |
| 33 | "packet\n"); |
| 34 | return NF_ACCEPT; |
| 35 | } |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame^] | 36 | nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 37 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame^] | 38 | return nft_do_chain_pktinfo(&pkt, ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 39 | } |
| 40 | |
| 41 | static struct nft_af_info nft_af_ipv4 __read_mostly = { |
| 42 | .family = NFPROTO_IPV4, |
| 43 | .nhooks = NF_INET_NUMHOOKS, |
| 44 | .owner = THIS_MODULE, |
| 45 | .hooks = { |
| 46 | [NF_INET_LOCAL_OUT] = nft_ipv4_output, |
| 47 | }, |
| 48 | }; |
| 49 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame^] | 50 | |
| 51 | static unsigned int |
| 52 | nft_do_chain_ipv4(const struct nf_hook_ops *ops, |
| 53 | struct sk_buff *skb, |
| 54 | const struct net_device *in, |
| 55 | const struct net_device *out, |
| 56 | int (*okfn)(struct sk_buff *)) |
| 57 | { |
| 58 | struct nft_pktinfo pkt; |
| 59 | |
| 60 | nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out); |
| 61 | |
| 62 | return nft_do_chain_pktinfo(&pkt, ops); |
| 63 | } |
| 64 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 65 | static struct nf_chain_type filter_ipv4 = { |
| 66 | .family = NFPROTO_IPV4, |
| 67 | .name = "filter", |
| 68 | .type = NFT_CHAIN_T_DEFAULT, |
| 69 | .hook_mask = (1 << NF_INET_LOCAL_IN) | |
| 70 | (1 << NF_INET_LOCAL_OUT) | |
| 71 | (1 << NF_INET_FORWARD) | |
| 72 | (1 << NF_INET_PRE_ROUTING) | |
| 73 | (1 << NF_INET_POST_ROUTING), |
| 74 | .fn = { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame^] | 75 | [NF_INET_LOCAL_IN] = nft_do_chain_ipv4, |
| 76 | [NF_INET_LOCAL_OUT] = nft_ipv4_output, |
| 77 | [NF_INET_FORWARD] = nft_do_chain_ipv4, |
| 78 | [NF_INET_PRE_ROUTING] = nft_do_chain_ipv4, |
| 79 | [NF_INET_POST_ROUTING] = nft_do_chain_ipv4, |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 80 | }, |
| 81 | }; |
| 82 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 83 | static int __init nf_tables_ipv4_init(void) |
| 84 | { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 85 | nft_register_chain_type(&filter_ipv4); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 86 | return nft_register_afinfo(&nft_af_ipv4); |
| 87 | } |
| 88 | |
| 89 | static void __exit nf_tables_ipv4_exit(void) |
| 90 | { |
| 91 | nft_unregister_afinfo(&nft_af_ipv4); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 92 | nft_unregister_chain_type(&filter_ipv4); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | module_init(nf_tables_ipv4_init); |
| 96 | module_exit(nf_tables_ipv4_exit); |
| 97 | |
| 98 | MODULE_LICENSE("GPL"); |
| 99 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 100 | MODULE_ALIAS_NFT_FAMILY(AF_INET); |