Merge master.kernel.org:/home/rmk/linux-2.6-serial
[linux-2.6] / net / bridge / netfilter / ebtable_filter.c
1 /*
2  *  ebtable_filter
3  *
4  *      Authors:
5  *      Bart De Schuymer <bdschuym@pandora.be>
6  *
7  *  April, 2002
8  *
9  */
10
11 #include <linux/netfilter_bridge/ebtables.h>
12 #include <linux/module.h>
13
14 #define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
15    (1 << NF_BR_LOCAL_OUT))
16
17 static struct ebt_entries initial_chains[] =
18 {
19         {
20                 .name   = "INPUT",
21                 .policy = EBT_ACCEPT,
22         },
23         {
24                 .name   = "FORWARD",
25                 .policy = EBT_ACCEPT,
26         },
27         {
28                 .name   = "OUTPUT",
29                 .policy = EBT_ACCEPT,
30         },
31 };
32
33 static struct ebt_replace initial_table =
34 {
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
53 static struct ebt_table frame_filter =
54
55         .name           = "filter",
56         .table          = &initial_table,
57         .valid_hooks    = FILTER_VALID_HOOKS, 
58         .lock           = RW_LOCK_UNLOCKED,
59         .check          = check,
60         .me             = THIS_MODULE,
61 };
62
63 static unsigned int
64 ebt_hook (unsigned int hook, struct sk_buff **pskb, const struct net_device *in,
65    const struct net_device *out, int (*okfn)(struct sk_buff *))
66 {
67         return ebt_do_table(hook, pskb, in, out, &frame_filter);
68 }
69
70 static struct nf_hook_ops ebt_ops_filter[] = {
71         {
72                 .hook           = ebt_hook,
73                 .owner          = THIS_MODULE,
74                 .pf             = PF_BRIDGE,
75                 .hooknum        = NF_BR_LOCAL_IN,
76                 .priority       = NF_BR_PRI_FILTER_BRIDGED,
77         },
78         {
79                 .hook           = ebt_hook,
80                 .owner          = THIS_MODULE,
81                 .pf             = PF_BRIDGE,
82                 .hooknum        = NF_BR_FORWARD,
83                 .priority       = NF_BR_PRI_FILTER_BRIDGED,
84         },
85         {
86                 .hook           = ebt_hook,
87                 .owner          = THIS_MODULE,
88                 .pf             = PF_BRIDGE,
89                 .hooknum        = NF_BR_LOCAL_OUT,
90                 .priority       = NF_BR_PRI_FILTER_OTHER,
91         },
92 };
93
94 static int __init ebtable_filter_init(void)
95 {
96         int i, j, ret;
97
98         ret = ebt_register_table(&frame_filter);
99         if (ret < 0)
100                 return ret;
101         for (i = 0; i < ARRAY_SIZE(ebt_ops_filter); i++)
102                 if ((ret = nf_register_hook(&ebt_ops_filter[i])) < 0)
103                         goto cleanup;
104         return ret;
105 cleanup:
106         for (j = 0; j < i; j++)
107                 nf_unregister_hook(&ebt_ops_filter[j]);
108         ebt_unregister_table(&frame_filter);
109         return ret;
110 }
111
112 static void __exit ebtable_filter_fini(void)
113 {
114         int i;
115
116         for (i = 0; i < ARRAY_SIZE(ebt_ops_filter); i++)
117                 nf_unregister_hook(&ebt_ops_filter[i]);
118         ebt_unregister_table(&frame_filter);
119 }
120
121 module_init(ebtable_filter_init);
122 module_exit(ebtable_filter_fini);
123 MODULE_LICENSE("GPL");