1 /*
2 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2013 Pablo Neira Ayuso <pablo@netfilter.org>
4 *
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.
8 *
9 * Development of this code funded by Astaro AG (http://www.astaro.com/)
10 */
11
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
21 static unsigned int
nft_do_chain_bridge(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)22 nft_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
43 static 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
nf_tables_bridge_init_net(struct net * net)57 static 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;
69 err:
70 kfree(net->nft.bridge);
71 return -ENOMEM;
72 }
73
nf_tables_bridge_exit_net(struct net * net)74 static 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
80 static struct pernet_operations nf_tables_bridge_net_ops = {
81 .init = nf_tables_bridge_init_net,
82 .exit = nf_tables_bridge_exit_net,
83 };
84
85 static 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
nf_br_saveroute(const struct sk_buff * skb,struct nf_queue_entry * entry)97 static void nf_br_saveroute(const struct sk_buff *skb,
98 struct nf_queue_entry *entry)
99 {
100 }
101
nf_br_reroute(struct net * net,struct sk_buff * skb,const struct nf_queue_entry * entry)102 static int nf_br_reroute(struct net *net, struct sk_buff *skb,
103 const struct nf_queue_entry *entry)
104 {
105 return 0;
106 }
107
nf_br_checksum(struct sk_buff * skb,unsigned int hook,unsigned int dataoff,u_int8_t protocol)108 static __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
nf_br_checksum_partial(struct sk_buff * skb,unsigned int hook,unsigned int dataoff,unsigned int len,u_int8_t protocol)114 static __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
nf_br_route(struct net * net,struct dst_entry ** dst,struct flowi * fl,bool strict __always_unused)121 static 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
127 static 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
nf_tables_bridge_init(void)137 static 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
152 err2:
153 nft_unregister_chain_type(&filter_bridge);
154 err1:
155 nf_unregister_afinfo(&nf_br_afinfo);
156 return ret;
157 }
158
nf_tables_bridge_exit(void)159 static 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
166 module_init(nf_tables_bridge_init);
167 module_exit(nf_tables_bridge_exit);
168
169 MODULE_LICENSE("GPL");
170 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
171 MODULE_ALIAS_NFT_FAMILY(AF_BRIDGE);
172