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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * ebtable_filter | |
4 | * | |
5 | * Authors: | |
6 | * Bart De Schuymer <bdschuym@pandora.be> | |
7 | * | |
8 | * April, 2002 | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/netfilter_bridge/ebtables.h> | |
94276fa8 | 13 | #include <uapi/linux/netfilter_bridge.h> |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | ||
16 | #define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \ | |
052a4bc4 | 17 | (1 << NF_BR_LOCAL_OUT)) |
1da177e4 | 18 | |
97ad8b53 | 19 | static struct ebt_entries initial_chains[] = { |
1da177e4 LT |
20 | { |
21 | .name = "INPUT", | |
22 | .policy = EBT_ACCEPT, | |
23 | }, | |
24 | { | |
25 | .name = "FORWARD", | |
26 | .policy = EBT_ACCEPT, | |
27 | }, | |
28 | { | |
29 | .name = "OUTPUT", | |
30 | .policy = EBT_ACCEPT, | |
31 | }, | |
32 | }; | |
33 | ||
97ad8b53 | 34 | static struct ebt_replace_kernel initial_table = { |
1da177e4 LT |
35 | .name = "filter", |
36 | .valid_hooks = FILTER_VALID_HOOKS, | |
37 | .entries_size = 3 * sizeof(struct ebt_entries), | |
38 | .hook_entry = { | |
39 | [NF_BR_LOCAL_IN] = &initial_chains[0], | |
40 | [NF_BR_FORWARD] = &initial_chains[1], | |
41 | [NF_BR_LOCAL_OUT] = &initial_chains[2], | |
42 | }, | |
43 | .entries = (char *)initial_chains, | |
44 | }; | |
45 | ||
46 | static int check(const struct ebt_table_info *info, unsigned int valid_hooks) | |
47 | { | |
48 | if (valid_hooks & ~FILTER_VALID_HOOKS) | |
49 | return -EINVAL; | |
50 | return 0; | |
51 | } | |
52 | ||
97ad8b53 | 53 | static const struct ebt_table frame_filter = { |
1da177e4 LT |
54 | .name = "filter", |
55 | .table = &initial_table, | |
9d6f229f | 56 | .valid_hooks = FILTER_VALID_HOOKS, |
1da177e4 LT |
57 | .check = check, |
58 | .me = THIS_MODULE, | |
59 | }; | |
60 | ||
61 | static unsigned int | |
06198b34 | 62 | ebt_in_hook(void *priv, struct sk_buff *skb, |
238e54c9 | 63 | const struct nf_hook_state *state) |
1da177e4 | 64 | { |
97b59c3a | 65 | return ebt_do_table(skb, state, state->net->xt.frame_filter); |
4aad1093 AD |
66 | } |
67 | ||
68 | static unsigned int | |
06198b34 | 69 | ebt_out_hook(void *priv, struct sk_buff *skb, |
238e54c9 | 70 | const struct nf_hook_state *state) |
4aad1093 | 71 | { |
97b59c3a | 72 | return ebt_do_table(skb, state, state->net->xt.frame_filter); |
1da177e4 LT |
73 | } |
74 | ||
591bb278 | 75 | static const struct nf_hook_ops ebt_ops_filter[] = { |
1da177e4 | 76 | { |
4aad1093 | 77 | .hook = ebt_in_hook, |
24c232d8 | 78 | .pf = NFPROTO_BRIDGE, |
1da177e4 LT |
79 | .hooknum = NF_BR_LOCAL_IN, |
80 | .priority = NF_BR_PRI_FILTER_BRIDGED, | |
81 | }, | |
82 | { | |
4aad1093 | 83 | .hook = ebt_in_hook, |
24c232d8 | 84 | .pf = NFPROTO_BRIDGE, |
1da177e4 LT |
85 | .hooknum = NF_BR_FORWARD, |
86 | .priority = NF_BR_PRI_FILTER_BRIDGED, | |
87 | }, | |
88 | { | |
4aad1093 | 89 | .hook = ebt_out_hook, |
24c232d8 | 90 | .pf = NFPROTO_BRIDGE, |
1da177e4 LT |
91 | .hooknum = NF_BR_LOCAL_OUT, |
92 | .priority = NF_BR_PRI_FILTER_OTHER, | |
93 | }, | |
94 | }; | |
95 | ||
4aad1093 AD |
96 | static int __net_init frame_filter_net_init(struct net *net) |
97 | { | |
e6b72ee8 AS |
98 | return ebt_register_table(net, &frame_filter, ebt_ops_filter, |
99 | &net->xt.frame_filter); | |
4aad1093 AD |
100 | } |
101 | ||
102 | static void __net_exit frame_filter_net_exit(struct net *net) | |
103 | { | |
aee12a0a | 104 | ebt_unregister_table(net, net->xt.frame_filter, ebt_ops_filter); |
4aad1093 AD |
105 | } |
106 | ||
107 | static struct pernet_operations frame_filter_net_ops = { | |
108 | .init = frame_filter_net_init, | |
109 | .exit = frame_filter_net_exit, | |
110 | }; | |
111 | ||
65b4b4e8 | 112 | static int __init ebtable_filter_init(void) |
1da177e4 | 113 | { |
aee12a0a | 114 | return register_pernet_subsys(&frame_filter_net_ops); |
1da177e4 LT |
115 | } |
116 | ||
65b4b4e8 | 117 | static void __exit ebtable_filter_fini(void) |
1da177e4 | 118 | { |
4aad1093 | 119 | unregister_pernet_subsys(&frame_filter_net_ops); |
1da177e4 LT |
120 | } |
121 | ||
65b4b4e8 AM |
122 | module_init(ebtable_filter_init); |
123 | module_exit(ebtable_filter_fini); | |
1da177e4 | 124 | MODULE_LICENSE("GPL"); |