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Linux/net/bridge/netfilter/ebtable_nat.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  ebtable_nat
  4  *
  5  *      Authors:
  6  *      Bart De Schuymer <bdschuym@pandora.be>
  7  *
  8  *  April, 2002
  9  *
 10  */
 11 
 12 #include <linux/netfilter_bridge/ebtables.h>
 13 #include <uapi/linux/netfilter_bridge.h>
 14 #include <linux/module.h>
 15 
 16 #define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
 17                          (1 << NF_BR_POST_ROUTING))
 18 
 19 static struct ebt_entries initial_chains[] = {
 20         {
 21                 .name   = "PREROUTING",
 22                 .policy = EBT_ACCEPT,
 23         },
 24         {
 25                 .name   = "OUTPUT",
 26                 .policy = EBT_ACCEPT,
 27         },
 28         {
 29                 .name   = "POSTROUTING",
 30                 .policy = EBT_ACCEPT,
 31         }
 32 };
 33 
 34 static struct ebt_replace_kernel initial_table = {
 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 const struct ebt_table frame_nat = {
 54         .name           = "nat",
 55         .table          = &initial_table,
 56         .valid_hooks    = NAT_VALID_HOOKS,
 57         .check          = check,
 58         .me             = THIS_MODULE,
 59 };
 60 
 61 static unsigned int
 62 ebt_nat_in(void *priv, struct sk_buff *skb,
 63            const struct nf_hook_state *state)
 64 {
 65         return ebt_do_table(skb, state, state->net->xt.frame_nat);
 66 }
 67 
 68 static unsigned int
 69 ebt_nat_out(void *priv, struct sk_buff *skb,
 70             const struct nf_hook_state *state)
 71 {
 72         return ebt_do_table(skb, state, state->net->xt.frame_nat);
 73 }
 74 
 75 static const struct nf_hook_ops ebt_ops_nat[] = {
 76         {
 77                 .hook           = ebt_nat_out,
 78                 .pf             = NFPROTO_BRIDGE,
 79                 .hooknum        = NF_BR_LOCAL_OUT,
 80                 .priority       = NF_BR_PRI_NAT_DST_OTHER,
 81         },
 82         {
 83                 .hook           = ebt_nat_out,
 84                 .pf             = NFPROTO_BRIDGE,
 85                 .hooknum        = NF_BR_POST_ROUTING,
 86                 .priority       = NF_BR_PRI_NAT_SRC,
 87         },
 88         {
 89                 .hook           = ebt_nat_in,
 90                 .pf             = NFPROTO_BRIDGE,
 91                 .hooknum        = NF_BR_PRE_ROUTING,
 92                 .priority       = NF_BR_PRI_NAT_DST_BRIDGED,
 93         },
 94 };
 95 
 96 static int __net_init frame_nat_net_init(struct net *net)
 97 {
 98         return ebt_register_table(net, &frame_nat, ebt_ops_nat,
 99                                   &net->xt.frame_nat);
100 }
101 
102 static void __net_exit frame_nat_net_exit(struct net *net)
103 {
104         ebt_unregister_table(net, net->xt.frame_nat, ebt_ops_nat);
105 }
106 
107 static struct pernet_operations frame_nat_net_ops = {
108         .init = frame_nat_net_init,
109         .exit = frame_nat_net_exit,
110 };
111 
112 static int __init ebtable_nat_init(void)
113 {
114         return register_pernet_subsys(&frame_nat_net_ops);
115 }
116 
117 static void __exit ebtable_nat_fini(void)
118 {
119         unregister_pernet_subsys(&frame_nat_net_ops);
120 }
121 
122 module_init(ebtable_nat_init);
123 module_exit(ebtable_nat_fini);
124 MODULE_LICENSE("GPL");
125 

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