| 1 | /* |
| 2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> |
| 3 | * Copyright (c) 2012-2013 Pablo Neira Ayuso <pablo@netfilter.org> |
| 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/net_namespace.h> |
| 18 | #include <net/ip.h> |
| 19 | #include <net/netfilter/nf_tables_ipv4.h> |
| 20 | |
| 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 | |
| 31 | return nft_do_chain_pktinfo(&pkt, ops); |
| 32 | } |
| 33 | |
| 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 | |
| 48 | return nft_do_chain_ipv4(ops, skb, in, out, okfn); |
| 49 | } |
| 50 | |
| 51 | struct nft_af_info nft_af_ipv4 __read_mostly = { |
| 52 | .family = NFPROTO_IPV4, |
| 53 | .nhooks = NF_INET_NUMHOOKS, |
| 54 | .owner = THIS_MODULE, |
| 55 | .nops = 1, |
| 56 | .hooks = { |
| 57 | [NF_INET_LOCAL_IN] = nft_do_chain_ipv4, |
| 58 | [NF_INET_LOCAL_OUT] = nft_ipv4_output, |
| 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, |
| 62 | }, |
| 63 | }; |
| 64 | EXPORT_SYMBOL_GPL(nft_af_ipv4); |
| 65 | |
| 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 | }; |
| 93 | |
| 94 | static struct nf_chain_type filter_ipv4 = { |
| 95 | .family = NFPROTO_IPV4, |
| 96 | .name = "filter", |
| 97 | .type = NFT_CHAIN_T_DEFAULT, |
| 98 | .me = THIS_MODULE, |
| 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), |
| 104 | }; |
| 105 | |
| 106 | static int __init nf_tables_ipv4_init(void) |
| 107 | { |
| 108 | nft_register_chain_type(&filter_ipv4); |
| 109 | return register_pernet_subsys(&nf_tables_ipv4_net_ops); |
| 110 | } |
| 111 | |
| 112 | static void __exit nf_tables_ipv4_exit(void) |
| 113 | { |
| 114 | unregister_pernet_subsys(&nf_tables_ipv4_net_ops); |
| 115 | nft_unregister_chain_type(&filter_ipv4); |
| 116 | } |
| 117 | |
| 118 | module_init(nf_tables_ipv4_init); |
| 119 | module_exit(nf_tables_ipv4_exit); |
| 120 | |
| 121 | MODULE_LICENSE("GPL"); |
| 122 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 123 | MODULE_ALIAS_NFT_FAMILY(AF_INET); |