Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/module.h> |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 11 | #include <linux/netdevice.h> |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 12 | #include <net/netfilter/nf_tables.h> |
| 13 | #include <linux/ip.h> |
| 14 | #include <linux/ipv6.h> |
| 15 | #include <net/netfilter/nf_tables_ipv4.h> |
| 16 | #include <net/netfilter/nf_tables_ipv6.h> |
| 17 | |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 18 | static unsigned int |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 19 | nft_do_chain_netdev(void *priv, struct sk_buff *skb, |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 20 | const struct nf_hook_state *state) |
| 21 | { |
| 22 | struct nft_pktinfo pkt; |
| 23 | |
Pablo Neira Ayuso | aa47e42 | 2015-12-15 21:29:16 +0100 | [diff] [blame] | 24 | switch (skb->protocol) { |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 25 | case htons(ETH_P_IP): |
Pablo Neira Ayuso | ddc8b60 | 2016-09-09 12:42:51 +0200 | [diff] [blame] | 26 | nft_set_pktinfo_ipv4_validate(&pkt, skb, state); |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 27 | break; |
| 28 | case htons(ETH_P_IPV6): |
Pablo Neira Ayuso | ddc8b60 | 2016-09-09 12:42:51 +0200 | [diff] [blame] | 29 | nft_set_pktinfo_ipv6_validate(&pkt, skb, state); |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 30 | break; |
| 31 | default: |
Pablo Neira Ayuso | beac5af | 2016-09-09 12:42:49 +0200 | [diff] [blame] | 32 | nft_set_pktinfo_unspec(&pkt, skb, state); |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 33 | break; |
| 34 | } |
| 35 | |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 36 | return nft_do_chain(&pkt, priv); |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | static struct nft_af_info nft_af_netdev __read_mostly = { |
| 40 | .family = NFPROTO_NETDEV, |
| 41 | .nhooks = NF_NETDEV_NUMHOOKS, |
| 42 | .owner = THIS_MODULE, |
| 43 | .flags = NFT_AF_NEEDS_DEV, |
| 44 | .nops = 1, |
| 45 | .hooks = { |
| 46 | [NF_NETDEV_INGRESS] = nft_do_chain_netdev, |
| 47 | }, |
| 48 | }; |
| 49 | |
| 50 | static int nf_tables_netdev_init_net(struct net *net) |
| 51 | { |
| 52 | net->nft.netdev = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL); |
| 53 | if (net->nft.netdev == NULL) |
| 54 | return -ENOMEM; |
| 55 | |
| 56 | memcpy(net->nft.netdev, &nft_af_netdev, sizeof(nft_af_netdev)); |
| 57 | |
| 58 | if (nft_register_afinfo(net, net->nft.netdev) < 0) |
| 59 | goto err; |
| 60 | |
| 61 | return 0; |
| 62 | err: |
| 63 | kfree(net->nft.netdev); |
| 64 | return -ENOMEM; |
| 65 | } |
| 66 | |
| 67 | static void nf_tables_netdev_exit_net(struct net *net) |
| 68 | { |
Pablo Neira Ayuso | df05ef8 | 2015-12-15 19:39:32 +0100 | [diff] [blame] | 69 | nft_unregister_afinfo(net, net->nft.netdev); |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 70 | kfree(net->nft.netdev); |
| 71 | } |
| 72 | |
| 73 | static struct pernet_operations nf_tables_netdev_net_ops = { |
| 74 | .init = nf_tables_netdev_init_net, |
| 75 | .exit = nf_tables_netdev_exit_net, |
| 76 | }; |
| 77 | |
| 78 | static const struct nf_chain_type nft_filter_chain_netdev = { |
| 79 | .name = "filter", |
| 80 | .type = NFT_CHAIN_T_DEFAULT, |
| 81 | .family = NFPROTO_NETDEV, |
| 82 | .owner = THIS_MODULE, |
| 83 | .hook_mask = (1 << NF_NETDEV_INGRESS), |
| 84 | }; |
| 85 | |
Pablo Neira Ayuso | 5ebe0b0 | 2015-12-15 19:40:49 +0100 | [diff] [blame] | 86 | static void nft_netdev_event(unsigned long event, struct net_device *dev, |
| 87 | struct nft_ctx *ctx) |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 88 | { |
Pablo Neira Ayuso | 5ebe0b0 | 2015-12-15 19:40:49 +0100 | [diff] [blame] | 89 | struct nft_base_chain *basechain = nft_base_chain(ctx->chain); |
| 90 | |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 91 | switch (event) { |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 92 | case NETDEV_UNREGISTER: |
| 93 | if (strcmp(basechain->dev_name, dev->name) != 0) |
| 94 | return; |
| 95 | |
Pablo Neira Ayuso | 5ebe0b0 | 2015-12-15 19:40:49 +0100 | [diff] [blame] | 96 | __nft_release_basechain(ctx); |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 97 | break; |
| 98 | case NETDEV_CHANGENAME: |
| 99 | if (dev->ifindex != basechain->ops[0].dev->ifindex) |
| 100 | return; |
| 101 | |
| 102 | strncpy(basechain->dev_name, dev->name, IFNAMSIZ); |
| 103 | break; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | static int nf_tables_netdev_event(struct notifier_block *this, |
| 108 | unsigned long event, void *ptr) |
| 109 | { |
| 110 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 111 | struct nft_af_info *afi; |
| 112 | struct nft_table *table; |
Pablo Neira Ayuso | 5ebe0b0 | 2015-12-15 19:40:49 +0100 | [diff] [blame] | 113 | struct nft_chain *chain, *nr; |
| 114 | struct nft_ctx ctx = { |
| 115 | .net = dev_net(dev), |
| 116 | }; |
| 117 | |
| 118 | if (event != NETDEV_UNREGISTER && |
| 119 | event != NETDEV_CHANGENAME) |
| 120 | return NOTIFY_DONE; |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 121 | |
| 122 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 123 | list_for_each_entry(afi, &dev_net(dev)->nft.af_info, list) { |
Pablo Neira Ayuso | 5ebe0b0 | 2015-12-15 19:40:49 +0100 | [diff] [blame] | 124 | ctx.afi = afi; |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 125 | if (afi->family != NFPROTO_NETDEV) |
| 126 | continue; |
| 127 | |
| 128 | list_for_each_entry(table, &afi->tables, list) { |
Pablo Neira Ayuso | 5ebe0b0 | 2015-12-15 19:40:49 +0100 | [diff] [blame] | 129 | ctx.table = table; |
| 130 | list_for_each_entry_safe(chain, nr, &table->chains, list) { |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 131 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 132 | continue; |
| 133 | |
Pablo Neira Ayuso | 5ebe0b0 | 2015-12-15 19:40:49 +0100 | [diff] [blame] | 134 | ctx.chain = chain; |
| 135 | nft_netdev_event(event, dev, &ctx); |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 136 | } |
| 137 | } |
| 138 | } |
| 139 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 140 | |
| 141 | return NOTIFY_DONE; |
| 142 | } |
| 143 | |
| 144 | static struct notifier_block nf_tables_netdev_notifier = { |
| 145 | .notifier_call = nf_tables_netdev_event, |
| 146 | }; |
| 147 | |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 148 | static int __init nf_tables_netdev_init(void) |
| 149 | { |
| 150 | int ret; |
| 151 | |
Gao Feng | 23d0750 | 2016-09-10 10:04:30 +0800 | [diff] [blame] | 152 | ret = nft_register_chain_type(&nft_filter_chain_netdev); |
| 153 | if (ret) |
| 154 | return ret; |
| 155 | |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 156 | ret = register_pernet_subsys(&nf_tables_netdev_net_ops); |
Gao Feng | 4e6577d | 2016-09-09 23:25:09 +0800 | [diff] [blame] | 157 | if (ret) |
| 158 | goto err1; |
| 159 | |
| 160 | ret = register_netdevice_notifier(&nf_tables_netdev_notifier); |
| 161 | if (ret) |
| 162 | goto err2; |
| 163 | |
Pablo Neira Ayuso | 35b8153 | 2016-01-18 13:52:29 +0100 | [diff] [blame] | 164 | return 0; |
Gao Feng | 4e6577d | 2016-09-09 23:25:09 +0800 | [diff] [blame] | 165 | |
| 166 | err2: |
| 167 | unregister_pernet_subsys(&nf_tables_netdev_net_ops); |
| 168 | err1: |
| 169 | nft_unregister_chain_type(&nft_filter_chain_netdev); |
| 170 | return ret; |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | static void __exit nf_tables_netdev_exit(void) |
| 174 | { |
Pablo Neira Ayuso | 835b803 | 2015-06-15 12:12:01 +0200 | [diff] [blame] | 175 | unregister_netdevice_notifier(&nf_tables_netdev_notifier); |
Pablo Neira Ayuso | ed6c413 | 2015-05-26 18:41:40 +0200 | [diff] [blame] | 176 | unregister_pernet_subsys(&nf_tables_netdev_net_ops); |
| 177 | nft_unregister_chain_type(&nft_filter_chain_netdev); |
| 178 | } |
| 179 | |
| 180 | module_init(nf_tables_netdev_init); |
| 181 | module_exit(nf_tables_netdev_exit); |
| 182 | |
| 183 | MODULE_LICENSE("GPL"); |
| 184 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| 185 | MODULE_ALIAS_NFT_FAMILY(5); /* NFPROTO_NETDEV */ |