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/*
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
* Copyright (c) 2013 Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netfilter_bridge.h>
#include <net/netfilter/nf_tables.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/netfilter/nf_tables_ipv4.h>
#include <net/netfilter/nf_tables_ipv6.h>
static unsigned int
nft_do_chain_bridge(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, skb, state);
switch (eth_hdr(skb)->h_proto) {
case htons(ETH_P_IP):
nft_set_pktinfo_ipv4_validate(&pkt, skb);
break;
case htons(ETH_P_IPV6):
nft_set_pktinfo_ipv6_validate(&pkt, skb);
break;
default:
nft_set_pktinfo_unspec(&pkt, skb);
break;
}
return nft_do_chain(&pkt, priv);
}
static struct nft_af_info nft_af_bridge __read_mostly = {
.family = NFPROTO_BRIDGE,
.nhooks = NF_BR_NUMHOOKS,
.owner = THIS_MODULE,
};
static int nf_tables_bridge_init_net(struct net *net)
{
net->nft.bridge = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
if (net->nft.bridge == NULL)
return -ENOMEM;
memcpy(net->nft.bridge, &nft_af_bridge, sizeof(nft_af_bridge));
if (nft_register_afinfo(net, net->nft.bridge) < 0)
goto err;
return 0;
err:
kfree(net->nft.bridge);
return -ENOMEM;
}
static void nf_tables_bridge_exit_net(struct net *net)
{
nft_unregister_afinfo(net, net->nft.bridge);
kfree(net->nft.bridge);
}
static struct pernet_operations nf_tables_bridge_net_ops = {
.init = nf_tables_bridge_init_net,
.exit = nf_tables_bridge_exit_net,
};
static const struct nf_chain_type filter_bridge = {
.name = "filter",
.type = NFT_CHAIN_T_DEFAULT,
.family = NFPROTO_BRIDGE,
.owner = THIS_MODULE,
.hook_mask = (1 << NF_BR_PRE_ROUTING) |
(1 << NF_BR_LOCAL_IN) |
(1 << NF_BR_FORWARD) |
(1 << NF_BR_LOCAL_OUT) |
(1 << NF_BR_POST_ROUTING),
.hooks = {
[NF_BR_PRE_ROUTING] = nft_do_chain_bridge,
[NF_BR_LOCAL_IN] = nft_do_chain_bridge,
[NF_BR_FORWARD] = nft_do_chain_bridge,
[NF_BR_LOCAL_OUT] = nft_do_chain_bridge,
[NF_BR_POST_ROUTING] = nft_do_chain_bridge,
},
};
static int nf_br_reroute(struct net *net, struct sk_buff *skb,
const struct nf_queue_entry *entry)
{
return 0;
}
static const struct nf_afinfo nf_br_afinfo = {
.family = AF_BRIDGE,
.reroute = nf_br_reroute,
.route_key_size = 0,
};
static int __init nf_tables_bridge_init(void)
{
int ret;
nf_register_afinfo(&nf_br_afinfo);
ret = nft_register_chain_type(&filter_bridge);
if (ret < 0)
goto err1;
ret = register_pernet_subsys(&nf_tables_bridge_net_ops);
if (ret < 0)
goto err2;
return ret;
err2:
nft_unregister_chain_type(&filter_bridge);
err1:
nf_unregister_afinfo(&nf_br_afinfo);
return ret;
}
static void __exit nf_tables_bridge_exit(void)
{
unregister_pernet_subsys(&nf_tables_bridge_net_ops);
nft_unregister_chain_type(&filter_bridge);
nf_unregister_afinfo(&nf_br_afinfo);
}
module_init(nf_tables_bridge_init);
module_exit(nf_tables_bridge_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_FAMILY(AF_BRIDGE);
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