2 * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
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.
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/netdevice.h>
12 #include <net/netfilter/nf_tables.h>
14 #include <linux/ipv6.h>
15 #include <net/netfilter/nf_tables_ipv4.h>
16 #include <net/netfilter/nf_tables_ipv6.h>
19 nft_do_chain_netdev(void *priv
, struct sk_buff
*skb
,
20 const struct nf_hook_state
*state
)
22 struct nft_pktinfo pkt
;
24 switch (skb
->protocol
) {
26 nft_set_pktinfo_ipv4_validate(&pkt
, skb
, state
);
28 case htons(ETH_P_IPV6
):
29 nft_set_pktinfo_ipv6_validate(&pkt
, skb
, state
);
32 nft_set_pktinfo_unspec(&pkt
, skb
, state
);
36 return nft_do_chain(&pkt
, priv
);
39 static struct nft_af_info nft_af_netdev __read_mostly
= {
40 .family
= NFPROTO_NETDEV
,
41 .nhooks
= NF_NETDEV_NUMHOOKS
,
43 .flags
= NFT_AF_NEEDS_DEV
,
46 [NF_NETDEV_INGRESS
] = nft_do_chain_netdev
,
50 static int nf_tables_netdev_init_net(struct net
*net
)
52 net
->nft
.netdev
= kmalloc(sizeof(struct nft_af_info
), GFP_KERNEL
);
53 if (net
->nft
.netdev
== NULL
)
56 memcpy(net
->nft
.netdev
, &nft_af_netdev
, sizeof(nft_af_netdev
));
58 if (nft_register_afinfo(net
, net
->nft
.netdev
) < 0)
63 kfree(net
->nft
.netdev
);
67 static void nf_tables_netdev_exit_net(struct net
*net
)
69 nft_unregister_afinfo(net
, net
->nft
.netdev
);
70 kfree(net
->nft
.netdev
);
73 static struct pernet_operations nf_tables_netdev_net_ops
= {
74 .init
= nf_tables_netdev_init_net
,
75 .exit
= nf_tables_netdev_exit_net
,
78 static const struct nf_chain_type nft_filter_chain_netdev
= {
80 .type
= NFT_CHAIN_T_DEFAULT
,
81 .family
= NFPROTO_NETDEV
,
83 .hook_mask
= (1 << NF_NETDEV_INGRESS
),
86 static void nft_netdev_event(unsigned long event
, struct net_device
*dev
,
89 struct nft_base_chain
*basechain
= nft_base_chain(ctx
->chain
);
92 case NETDEV_UNREGISTER
:
93 if (strcmp(basechain
->dev_name
, dev
->name
) != 0)
96 __nft_release_basechain(ctx
);
98 case NETDEV_CHANGENAME
:
99 if (dev
->ifindex
!= basechain
->ops
[0].dev
->ifindex
)
102 strncpy(basechain
->dev_name
, dev
->name
, IFNAMSIZ
);
107 static int nf_tables_netdev_event(struct notifier_block
*this,
108 unsigned long event
, void *ptr
)
110 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
111 struct nft_af_info
*afi
;
112 struct nft_table
*table
;
113 struct nft_chain
*chain
, *nr
;
114 struct nft_ctx ctx
= {
118 if (event
!= NETDEV_UNREGISTER
&&
119 event
!= NETDEV_CHANGENAME
)
122 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
123 list_for_each_entry(afi
, &dev_net(dev
)->nft
.af_info
, list
) {
125 if (afi
->family
!= NFPROTO_NETDEV
)
128 list_for_each_entry(table
, &afi
->tables
, list
) {
130 list_for_each_entry_safe(chain
, nr
, &table
->chains
, list
) {
131 if (!(chain
->flags
& NFT_BASE_CHAIN
))
135 nft_netdev_event(event
, dev
, &ctx
);
139 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
144 static struct notifier_block nf_tables_netdev_notifier
= {
145 .notifier_call
= nf_tables_netdev_event
,
148 static int __init
nf_tables_netdev_init(void)
152 ret
= nft_register_chain_type(&nft_filter_chain_netdev
);
156 ret
= register_pernet_subsys(&nf_tables_netdev_net_ops
);
160 ret
= register_netdevice_notifier(&nf_tables_netdev_notifier
);
167 unregister_pernet_subsys(&nf_tables_netdev_net_ops
);
169 nft_unregister_chain_type(&nft_filter_chain_netdev
);
173 static void __exit
nf_tables_netdev_exit(void)
175 unregister_netdevice_notifier(&nf_tables_netdev_notifier
);
176 unregister_pernet_subsys(&nf_tables_netdev_net_ops
);
177 nft_unregister_chain_type(&nft_filter_chain_netdev
);
180 module_init(nf_tables_netdev_init
);
181 module_exit(nf_tables_netdev_exit
);
183 MODULE_LICENSE("GPL");
184 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
185 MODULE_ALIAS_NFT_FAMILY(5); /* NFPROTO_NETDEV */