2 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2013 Pablo Neira Ayuso <pablo@netfilter.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Development of this code funded by Astaro AG (http://www.astaro.com/)
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/netfilter_bridge.h>
15 #include <net/netfilter/nf_tables.h>
16 #include <net/netfilter/nf_tables_bridge.h>
18 #include <linux/ipv6.h>
19 #include <net/netfilter/nf_tables_ipv4.h>
20 #include <net/netfilter/nf_tables_ipv6.h>
22 int nft_bridge_iphdr_validate(struct sk_buff
*skb
)
27 if (!pskb_may_pull(skb
, sizeof(struct iphdr
)))
31 if (iph
->ihl
< 5 || iph
->version
!= 4)
34 len
= ntohs(iph
->tot_len
);
37 else if (len
< (iph
->ihl
*4))
40 if (!pskb_may_pull(skb
, iph
->ihl
*4))
45 EXPORT_SYMBOL_GPL(nft_bridge_iphdr_validate
);
47 int nft_bridge_ip6hdr_validate(struct sk_buff
*skb
)
52 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
56 if (hdr
->version
!= 6)
59 pkt_len
= ntohs(hdr
->payload_len
);
60 if (pkt_len
+ sizeof(struct ipv6hdr
) > skb
->len
)
65 EXPORT_SYMBOL_GPL(nft_bridge_ip6hdr_validate
);
67 static inline void nft_bridge_set_pktinfo_ipv4(struct nft_pktinfo
*pkt
,
69 const struct nf_hook_state
*state
)
71 if (nft_bridge_iphdr_validate(skb
))
72 nft_set_pktinfo_ipv4(pkt
, skb
, state
);
74 nft_set_pktinfo(pkt
, skb
, state
);
77 static inline void nft_bridge_set_pktinfo_ipv6(struct nft_pktinfo
*pkt
,
79 const struct nf_hook_state
*state
)
81 #if IS_ENABLED(CONFIG_IPV6)
82 if (nft_bridge_ip6hdr_validate(skb
) &&
83 nft_set_pktinfo_ipv6(pkt
, skb
, state
) == 0)
86 nft_set_pktinfo(pkt
, skb
, state
);
90 nft_do_chain_bridge(void *priv
,
92 const struct nf_hook_state
*state
)
94 struct nft_pktinfo pkt
;
96 switch (eth_hdr(skb
)->h_proto
) {
98 nft_bridge_set_pktinfo_ipv4(&pkt
, skb
, state
);
100 case htons(ETH_P_IPV6
):
101 nft_bridge_set_pktinfo_ipv6(&pkt
, skb
, state
);
104 nft_set_pktinfo(&pkt
, skb
, state
);
108 return nft_do_chain(&pkt
, priv
);
111 static struct nft_af_info nft_af_bridge __read_mostly
= {
112 .family
= NFPROTO_BRIDGE
,
113 .nhooks
= NF_BR_NUMHOOKS
,
114 .owner
= THIS_MODULE
,
117 [NF_BR_PRE_ROUTING
] = nft_do_chain_bridge
,
118 [NF_BR_LOCAL_IN
] = nft_do_chain_bridge
,
119 [NF_BR_FORWARD
] = nft_do_chain_bridge
,
120 [NF_BR_LOCAL_OUT
] = nft_do_chain_bridge
,
121 [NF_BR_POST_ROUTING
] = nft_do_chain_bridge
,
125 static int nf_tables_bridge_init_net(struct net
*net
)
127 net
->nft
.bridge
= kmalloc(sizeof(struct nft_af_info
), GFP_KERNEL
);
128 if (net
->nft
.bridge
== NULL
)
131 memcpy(net
->nft
.bridge
, &nft_af_bridge
, sizeof(nft_af_bridge
));
133 if (nft_register_afinfo(net
, net
->nft
.bridge
) < 0)
138 kfree(net
->nft
.bridge
);
142 static void nf_tables_bridge_exit_net(struct net
*net
)
144 nft_unregister_afinfo(net
, net
->nft
.bridge
);
145 kfree(net
->nft
.bridge
);
148 static struct pernet_operations nf_tables_bridge_net_ops
= {
149 .init
= nf_tables_bridge_init_net
,
150 .exit
= nf_tables_bridge_exit_net
,
153 static const struct nf_chain_type filter_bridge
= {
155 .type
= NFT_CHAIN_T_DEFAULT
,
156 .family
= NFPROTO_BRIDGE
,
157 .owner
= THIS_MODULE
,
158 .hook_mask
= (1 << NF_BR_PRE_ROUTING
) |
159 (1 << NF_BR_LOCAL_IN
) |
160 (1 << NF_BR_FORWARD
) |
161 (1 << NF_BR_LOCAL_OUT
) |
162 (1 << NF_BR_POST_ROUTING
),
165 static int __init
nf_tables_bridge_init(void)
169 nft_register_chain_type(&filter_bridge
);
170 ret
= register_pernet_subsys(&nf_tables_bridge_net_ops
);
172 nft_unregister_chain_type(&filter_bridge
);
177 static void __exit
nf_tables_bridge_exit(void)
179 unregister_pernet_subsys(&nf_tables_bridge_net_ops
);
180 nft_unregister_chain_type(&filter_bridge
);
183 module_init(nf_tables_bridge_init
);
184 module_exit(nf_tables_bridge_exit
);
186 MODULE_LICENSE("GPL");
187 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
188 MODULE_ALIAS_NFT_FAMILY(AF_BRIDGE
);