143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/*
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* Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <net/netfilter/nf_tables.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <net/netfilter/nf_tables_ipv4.h>
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#include <net/netfilter/nf_tables_ipv6.h>
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static unsigned int
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nft_do_chain_netdev(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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struct nft_pktinfo pkt;
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nft_set_pktinfo(&pkt, skb, state);
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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nft_set_pktinfo_ipv4_validate(&pkt, skb);
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break;
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case htons(ETH_P_IPV6):
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nft_set_pktinfo_ipv6_validate(&pkt, skb);
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break;
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default:
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nft_set_pktinfo_unspec(&pkt, skb);
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break;
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}
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return nft_do_chain(&pkt, priv);
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}
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static const struct nf_chain_type nft_filter_chain_netdev = {
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.name = "filter",
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.type = NFT_CHAIN_T_DEFAULT,
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.family = NFPROTO_NETDEV,
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.owner = THIS_MODULE,
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.hook_mask = (1 << NF_NETDEV_INGRESS),
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.hooks = {
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[NF_NETDEV_INGRESS] = nft_do_chain_netdev,
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},
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};
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static void nft_netdev_event(unsigned long event, struct net_device *dev,
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struct nft_ctx *ctx)
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{
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struct nft_base_chain *basechain = nft_base_chain(ctx->chain);
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switch (event) {
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case NETDEV_UNREGISTER:
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if (strcmp(basechain->dev_name, dev->name) != 0)
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return;
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__nft_release_basechain(ctx);
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break;
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case NETDEV_CHANGENAME:
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if (dev->ifindex != basechain->ops.dev->ifindex)
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return;
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strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
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break;
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}
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}
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static int nf_tables_netdev_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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struct nft_table *table;
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struct nft_chain *chain, *nr;
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struct nft_ctx ctx = {
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.net = dev_net(dev),
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};
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if (event != NETDEV_UNREGISTER &&
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event != NETDEV_CHANGENAME)
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return NOTIFY_DONE;
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nfnl_lock(NFNL_SUBSYS_NFTABLES);
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list_for_each_entry(table, &ctx.net->nft.tables, list) {
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if (table->family != NFPROTO_NETDEV)
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continue;
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ctx.family = table->family;
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ctx.table = table;
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list_for_each_entry_safe(chain, nr, &table->chains, list) {
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if (!nft_is_base_chain(chain))
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continue;
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ctx.chain = chain;
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nft_netdev_event(event, dev, &ctx);
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}
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}
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nfnl_unlock(NFNL_SUBSYS_NFTABLES);
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return NOTIFY_DONE;
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}
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static struct notifier_block nf_tables_netdev_notifier = {
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.notifier_call = nf_tables_netdev_event,
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};
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static int __init nf_tables_netdev_init(void)
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{
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int ret;
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ret = nft_register_chain_type(&nft_filter_chain_netdev);
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if (ret)
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return ret;
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ret = register_netdevice_notifier(&nf_tables_netdev_notifier);
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if (ret)
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goto err_register_netdevice_notifier;
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return 0;
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err_register_netdevice_notifier:
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nft_unregister_chain_type(&nft_filter_chain_netdev);
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return ret;
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}
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static void __exit nf_tables_netdev_exit(void)
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{
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unregister_netdevice_notifier(&nf_tables_netdev_notifier);
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nft_unregister_chain_type(&nft_filter_chain_netdev);
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}
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module_init(nf_tables_netdev_init);
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module_exit(nf_tables_netdev_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
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MODULE_ALIAS_NFT_CHAIN(5, "filter"); /* NFPROTO_NETDEV */
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