microblaze: uaccess: fix put_user and get_user macros
[linux-2.6.git] / net / bridge / netfilter / ebtable_nat.c
1 /*
2  *  ebtable_nat
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 NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
15    (1 << NF_BR_POST_ROUTING))
16
17 static struct ebt_entries initial_chains[] =
18 {
19         {
20                 .name   = "PREROUTING",
21                 .policy = EBT_ACCEPT,
22         },
23         {
24                 .name   = "OUTPUT",
25                 .policy = EBT_ACCEPT,
26         },
27         {
28                 .name   = "POSTROUTING",
29                 .policy = EBT_ACCEPT,
30         }
31 };
32
33 static struct ebt_replace_kernel initial_table =
34 {
35         .name           = "nat",
36         .valid_hooks    = NAT_VALID_HOOKS,
37         .entries_size   = 3 * sizeof(struct ebt_entries),
38         .hook_entry     = {
39                 [NF_BR_PRE_ROUTING]     = &initial_chains[0],
40                 [NF_BR_LOCAL_OUT]       = &initial_chains[1],
41                 [NF_BR_POST_ROUTING]    = &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 & ~NAT_VALID_HOOKS)
49                 return -EINVAL;
50         return 0;
51 }
52
53 static struct ebt_table frame_nat =
54 {
55         .name           = "nat",
56         .table          = &initial_table,
57         .valid_hooks    = NAT_VALID_HOOKS,
58         .check          = check,
59         .me             = THIS_MODULE,
60 };
61
62 static unsigned int
63 ebt_nat_in(unsigned int hook, struct sk_buff *skb, const struct net_device *in
64    , const struct net_device *out, int (*okfn)(struct sk_buff *))
65 {
66         return ebt_do_table(hook, skb, in, out, dev_net(in)->xt.frame_nat);
67 }
68
69 static unsigned int
70 ebt_nat_out(unsigned int hook, struct sk_buff *skb, const struct net_device *in
71    , const struct net_device *out, int (*okfn)(struct sk_buff *))
72 {
73         return ebt_do_table(hook, skb, in, out, dev_net(out)->xt.frame_nat);
74 }
75
76 static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
77         {
78                 .hook           = ebt_nat_out,
79                 .owner          = THIS_MODULE,
80                 .pf             = NFPROTO_BRIDGE,
81                 .hooknum        = NF_BR_LOCAL_OUT,
82                 .priority       = NF_BR_PRI_NAT_DST_OTHER,
83         },
84         {
85                 .hook           = ebt_nat_out,
86                 .owner          = THIS_MODULE,
87                 .pf             = NFPROTO_BRIDGE,
88                 .hooknum        = NF_BR_POST_ROUTING,
89                 .priority       = NF_BR_PRI_NAT_SRC,
90         },
91         {
92                 .hook           = ebt_nat_in,
93                 .owner          = THIS_MODULE,
94                 .pf             = NFPROTO_BRIDGE,
95                 .hooknum        = NF_BR_PRE_ROUTING,
96                 .priority       = NF_BR_PRI_NAT_DST_BRIDGED,
97         },
98 };
99
100 static int __net_init frame_nat_net_init(struct net *net)
101 {
102         net->xt.frame_nat = ebt_register_table(net, &frame_nat);
103         if (IS_ERR(net->xt.frame_nat))
104                 return PTR_ERR(net->xt.frame_nat);
105         return 0;
106 }
107
108 static void __net_exit frame_nat_net_exit(struct net *net)
109 {
110         ebt_unregister_table(net, net->xt.frame_nat);
111 }
112
113 static struct pernet_operations frame_nat_net_ops = {
114         .init = frame_nat_net_init,
115         .exit = frame_nat_net_exit,
116 };
117
118 static int __init ebtable_nat_init(void)
119 {
120         int ret;
121
122         ret = register_pernet_subsys(&frame_nat_net_ops);
123         if (ret < 0)
124                 return ret;
125         ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
126         if (ret < 0)
127                 unregister_pernet_subsys(&frame_nat_net_ops);
128         return ret;
129 }
130
131 static void __exit ebtable_nat_fini(void)
132 {
133         nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
134         unregister_pernet_subsys(&frame_nat_net_ops);
135 }
136
137 module_init(ebtable_nat_init);
138 module_exit(ebtable_nat_fini);
139 MODULE_LICENSE("GPL");