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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 <linux/ip.h>
17#include <linux/ipv6.h>
18#include <net/netfilter/nf_tables_ipv4.h>
19#include <net/netfilter/nf_tables_ipv6.h>
20
21static unsigned int
22nft_do_chain_bridge(void *priv,
23 struct sk_buff *skb,
24 const struct nf_hook_state *state)
25{
26 struct nft_pktinfo pkt;
27
28 switch (eth_hdr(skb)->h_proto) {
29 case htons(ETH_P_IP):
30 nft_set_pktinfo_ipv4_validate(&pkt, skb, state);
31 break;
32 case htons(ETH_P_IPV6):
33 nft_set_pktinfo_ipv6_validate(&pkt, skb, state);
34 break;
35 default:
36 nft_set_pktinfo_unspec(&pkt, skb, state);
37 break;
38 }
39
40 return nft_do_chain(&pkt, priv);
41}
42
43static struct nft_af_info nft_af_bridge __read_mostly = {
44 .family = NFPROTO_BRIDGE,
45 .nhooks = NF_BR_NUMHOOKS,
46 .owner = THIS_MODULE,
47 .nops = 1,
48 .hooks = {
49 [NF_BR_PRE_ROUTING] = nft_do_chain_bridge,
50 [NF_BR_LOCAL_IN] = nft_do_chain_bridge,
51 [NF_BR_FORWARD] = nft_do_chain_bridge,
52 [NF_BR_LOCAL_OUT] = nft_do_chain_bridge,
53 [NF_BR_POST_ROUTING] = nft_do_chain_bridge,
54 },
55};
56
57static int nf_tables_bridge_init_net(struct net *net)
58{
59 net->nft.bridge = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
60 if (net->nft.bridge == NULL)
61 return -ENOMEM;
62
63 memcpy(net->nft.bridge, &nft_af_bridge, sizeof(nft_af_bridge));
64
65 if (nft_register_afinfo(net, net->nft.bridge) < 0)
66 goto err;
67
68 return 0;
69err:
70 kfree(net->nft.bridge);
71 return -ENOMEM;
72}
73
74static void nf_tables_bridge_exit_net(struct net *net)
75{
76 nft_unregister_afinfo(net, net->nft.bridge);
77 kfree(net->nft.bridge);
78}
79
80static struct pernet_operations nf_tables_bridge_net_ops = {
81 .init = nf_tables_bridge_init_net,
82 .exit = nf_tables_bridge_exit_net,
83};
84
85static const struct nf_chain_type filter_bridge = {
86 .name = "filter",
87 .type = NFT_CHAIN_T_DEFAULT,
88 .family = NFPROTO_BRIDGE,
89 .owner = THIS_MODULE,
90 .hook_mask = (1 << NF_BR_PRE_ROUTING) |
91 (1 << NF_BR_LOCAL_IN) |
92 (1 << NF_BR_FORWARD) |
93 (1 << NF_BR_LOCAL_OUT) |
94 (1 << NF_BR_POST_ROUTING),
95};
96
97static void nf_br_saveroute(const struct sk_buff *skb,
98 struct nf_queue_entry *entry)
99{
100}
101
102static int nf_br_reroute(struct net *net, struct sk_buff *skb,
103 const struct nf_queue_entry *entry)
104{
105 return 0;
106}
107
108static __sum16 nf_br_checksum(struct sk_buff *skb, unsigned int hook,
109 unsigned int dataoff, u_int8_t protocol)
110{
111 return 0;
112}
113
114static __sum16 nf_br_checksum_partial(struct sk_buff *skb, unsigned int hook,
115 unsigned int dataoff, unsigned int len,
116 u_int8_t protocol)
117{
118 return 0;
119}
120
121static int nf_br_route(struct net *net, struct dst_entry **dst,
122 struct flowi *fl, bool strict __always_unused)
123{
124 return 0;
125}
126
127static const struct nf_afinfo nf_br_afinfo = {
128 .family = AF_BRIDGE,
129 .checksum = nf_br_checksum,
130 .checksum_partial = nf_br_checksum_partial,
131 .route = nf_br_route,
132 .saveroute = nf_br_saveroute,
133 .reroute = nf_br_reroute,
134 .route_key_size = 0,
135};
136
137static int __init nf_tables_bridge_init(void)
138{
139 int ret;
140
141 nf_register_afinfo(&nf_br_afinfo);
142 ret = nft_register_chain_type(&filter_bridge);
143 if (ret < 0)
144 goto err1;
145
146 ret = register_pernet_subsys(&nf_tables_bridge_net_ops);
147 if (ret < 0)
148 goto err2;
149
150 return ret;
151
152err2:
153 nft_unregister_chain_type(&filter_bridge);
154err1:
155 nf_unregister_afinfo(&nf_br_afinfo);
156 return ret;
157}
158
159static void __exit nf_tables_bridge_exit(void)
160{
161 unregister_pernet_subsys(&nf_tables_bridge_net_ops);
162 nft_unregister_chain_type(&filter_bridge);
163 nf_unregister_afinfo(&nf_br_afinfo);
164}
165
166module_init(nf_tables_bridge_init);
167module_exit(nf_tables_bridge_exit);
168
169MODULE_LICENSE("GPL");
170MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
171MODULE_ALIAS_NFT_FAMILY(AF_BRIDGE);
172
