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_netdev_set_pktinfo_ipv4(struct nft_pktinfo
*pkt
,
20 const struct nf_hook_ops
*ops
, struct sk_buff
*skb
,
21 const struct nf_hook_state
*state
)
23 struct iphdr
*iph
, _iph
;
26 nft_set_pktinfo(pkt
, ops
, skb
, state
);
28 iph
= skb_header_pointer(skb
, skb_network_offset(skb
), sizeof(*iph
),
34 if (iph
->ihl
< 5 || iph
->version
!= 4)
37 len
= ntohs(iph
->tot_len
);
44 pkt
->tprot
= iph
->protocol
;
45 pkt
->xt
.thoff
= thoff
;
46 pkt
->xt
.fragoff
= ntohs(iph
->frag_off
) & IP_OFFSET
;
50 __nft_netdev_set_pktinfo_ipv6(struct nft_pktinfo
*pkt
,
51 const struct nf_hook_ops
*ops
,
53 const struct nf_hook_state
*state
)
55 #if IS_ENABLED(CONFIG_IPV6)
56 struct ipv6hdr
*ip6h
, _ip6h
;
57 unsigned int thoff
= 0;
58 unsigned short frag_off
;
62 ip6h
= skb_header_pointer(skb
, skb_network_offset(skb
), sizeof(*ip6h
),
67 if (ip6h
->version
!= 6)
70 pkt_len
= ntohs(ip6h
->payload_len
);
71 if (pkt_len
+ sizeof(*ip6h
) > skb
->len
)
74 protohdr
= ipv6_find_hdr(pkt
->skb
, &thoff
, -1, &frag_off
, NULL
);
78 pkt
->tprot
= protohdr
;
79 pkt
->xt
.thoff
= thoff
;
80 pkt
->xt
.fragoff
= frag_off
;
84 static inline void nft_netdev_set_pktinfo_ipv6(struct nft_pktinfo
*pkt
,
85 const struct nf_hook_ops
*ops
,
87 const struct nf_hook_state
*state
)
89 nft_set_pktinfo(pkt
, ops
, skb
, state
);
90 __nft_netdev_set_pktinfo_ipv6(pkt
, ops
, skb
, state
);
94 nft_do_chain_netdev(const struct nf_hook_ops
*ops
, struct sk_buff
*skb
,
95 const struct nf_hook_state
*state
)
97 struct nft_pktinfo pkt
;
99 switch (eth_hdr(skb
)->h_proto
) {
100 case htons(ETH_P_IP
):
101 nft_netdev_set_pktinfo_ipv4(&pkt
, ops
, skb
, state
);
103 case htons(ETH_P_IPV6
):
104 nft_netdev_set_pktinfo_ipv6(&pkt
, ops
, skb
, state
);
107 nft_set_pktinfo(&pkt
, ops
, skb
, state
);
111 return nft_do_chain(&pkt
, ops
);
114 static struct nft_af_info nft_af_netdev __read_mostly
= {
115 .family
= NFPROTO_NETDEV
,
116 .nhooks
= NF_NETDEV_NUMHOOKS
,
117 .owner
= THIS_MODULE
,
118 .flags
= NFT_AF_NEEDS_DEV
,
121 [NF_NETDEV_INGRESS
] = nft_do_chain_netdev
,
125 static int nf_tables_netdev_init_net(struct net
*net
)
127 net
->nft
.netdev
= kmalloc(sizeof(struct nft_af_info
), GFP_KERNEL
);
128 if (net
->nft
.netdev
== NULL
)
131 memcpy(net
->nft
.netdev
, &nft_af_netdev
, sizeof(nft_af_netdev
));
133 if (nft_register_afinfo(net
, net
->nft
.netdev
) < 0)
138 kfree(net
->nft
.netdev
);
142 static void nf_tables_netdev_exit_net(struct net
*net
)
144 nft_unregister_afinfo(net
->nft
.netdev
);
145 kfree(net
->nft
.netdev
);
148 static struct pernet_operations nf_tables_netdev_net_ops
= {
149 .init
= nf_tables_netdev_init_net
,
150 .exit
= nf_tables_netdev_exit_net
,
153 static const struct nf_chain_type nft_filter_chain_netdev
= {
155 .type
= NFT_CHAIN_T_DEFAULT
,
156 .family
= NFPROTO_NETDEV
,
157 .owner
= THIS_MODULE
,
158 .hook_mask
= (1 << NF_NETDEV_INGRESS
),
161 static void nft_netdev_event(unsigned long event
, struct nft_af_info
*afi
,
162 struct net_device
*dev
, struct nft_table
*table
,
163 struct nft_base_chain
*basechain
)
166 case NETDEV_REGISTER
:
167 if (strcmp(basechain
->dev_name
, dev
->name
) != 0)
170 BUG_ON(!(basechain
->flags
& NFT_BASECHAIN_DISABLED
));
173 basechain
->ops
[0].dev
= dev
;
174 basechain
->flags
&= ~NFT_BASECHAIN_DISABLED
;
175 if (!(table
->flags
& NFT_TABLE_F_DORMANT
))
176 nft_register_basechain(basechain
, afi
->nops
);
178 case NETDEV_UNREGISTER
:
179 if (strcmp(basechain
->dev_name
, dev
->name
) != 0)
182 BUG_ON(basechain
->flags
& NFT_BASECHAIN_DISABLED
);
184 if (!(table
->flags
& NFT_TABLE_F_DORMANT
))
185 nft_unregister_basechain(basechain
, afi
->nops
);
187 dev_put(basechain
->ops
[0].dev
);
188 basechain
->ops
[0].dev
= NULL
;
189 basechain
->flags
|= NFT_BASECHAIN_DISABLED
;
191 case NETDEV_CHANGENAME
:
192 if (dev
->ifindex
!= basechain
->ops
[0].dev
->ifindex
)
195 strncpy(basechain
->dev_name
, dev
->name
, IFNAMSIZ
);
200 static int nf_tables_netdev_event(struct notifier_block
*this,
201 unsigned long event
, void *ptr
)
203 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
204 struct nft_af_info
*afi
;
205 struct nft_table
*table
;
206 struct nft_chain
*chain
;
208 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
209 list_for_each_entry(afi
, &dev_net(dev
)->nft
.af_info
, list
) {
210 if (afi
->family
!= NFPROTO_NETDEV
)
213 list_for_each_entry(table
, &afi
->tables
, list
) {
214 list_for_each_entry(chain
, &table
->chains
, list
) {
215 if (!(chain
->flags
& NFT_BASE_CHAIN
))
218 nft_netdev_event(event
, afi
, dev
, table
,
219 nft_base_chain(chain
));
223 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
228 static struct notifier_block nf_tables_netdev_notifier
= {
229 .notifier_call
= nf_tables_netdev_event
,
232 static int __init
nf_tables_netdev_init(void)
236 nft_register_chain_type(&nft_filter_chain_netdev
);
237 ret
= register_pernet_subsys(&nf_tables_netdev_net_ops
);
239 nft_unregister_chain_type(&nft_filter_chain_netdev
);
241 register_netdevice_notifier(&nf_tables_netdev_notifier
);
246 static void __exit
nf_tables_netdev_exit(void)
248 unregister_netdevice_notifier(&nf_tables_netdev_notifier
);
249 unregister_pernet_subsys(&nf_tables_netdev_net_ops
);
250 nft_unregister_chain_type(&nft_filter_chain_netdev
);
253 module_init(nf_tables_netdev_init
);
254 module_exit(nf_tables_netdev_exit
);
256 MODULE_LICENSE("GPL");
257 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
258 MODULE_ALIAS_NFT_FAMILY(5); /* NFPROTO_NETDEV */