Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * ebt_redirect | |
4 | * | |
5 | * Authors: | |
6 | * Bart De Schuymer <bdschuym@pandora.be> | |
7 | * | |
8 | * April, 2002 | |
9 | * | |
10 | */ | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <net/sock.h> | |
13 | #include "../br_private.h" | |
18219d3f JE |
14 | #include <linux/netfilter.h> |
15 | #include <linux/netfilter/x_tables.h> | |
16 | #include <linux/netfilter_bridge/ebtables.h> | |
17 | #include <linux/netfilter_bridge/ebt_redirect.h> | |
1da177e4 | 18 | |
2d06d4a5 | 19 | static unsigned int |
4b560b44 | 20 | ebt_redirect_tg(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 21 | { |
7eb35586 | 22 | const struct ebt_redirect_info *info = par->targinfo; |
1da177e4 | 23 | |
eb1197bc | 24 | if (!skb_make_writable(skb, 0)) |
1b04ab45 | 25 | return EBT_DROP; |
1da177e4 | 26 | |
613dbd95 | 27 | if (xt_hooknum(par) != NF_BR_BROUTING) |
e2361cb9 | 28 | /* rcu_read_lock()ed by nf_hook_thresh */ |
04091142 | 29 | ether_addr_copy(eth_hdr(skb)->h_dest, |
613dbd95 | 30 | br_port_get_rcu(xt_in(par))->br->dev->dev_addr); |
1da177e4 | 31 | else |
613dbd95 | 32 | ether_addr_copy(eth_hdr(skb)->h_dest, xt_in(par)->dev_addr); |
3db05fea | 33 | skb->pkt_type = PACKET_HOST; |
1da177e4 LT |
34 | return info->target; |
35 | } | |
36 | ||
135367b8 | 37 | static int ebt_redirect_tg_check(const struct xt_tgchk_param *par) |
1da177e4 | 38 | { |
af5d6dc2 JE |
39 | const struct ebt_redirect_info *info = par->targinfo; |
40 | unsigned int hook_mask; | |
1da177e4 | 41 | |
1da177e4 | 42 | if (BASE_CHAIN && info->target == EBT_RETURN) |
d6b00a53 | 43 | return -EINVAL; |
af5d6dc2 JE |
44 | |
45 | hook_mask = par->hook_mask & ~(1 << NF_BR_NUMHOOKS); | |
46 | if ((strcmp(par->table, "nat") != 0 || | |
47 | hook_mask & ~(1 << NF_BR_PRE_ROUTING)) && | |
48 | (strcmp(par->table, "broute") != 0 || | |
49 | hook_mask & ~(1 << NF_BR_BROUTING))) | |
d6b00a53 | 50 | return -EINVAL; |
e15b9c50 | 51 | if (ebt_invalid_target(info->target)) |
d6b00a53 JE |
52 | return -EINVAL; |
53 | return 0; | |
1da177e4 LT |
54 | } |
55 | ||
043ef46c JE |
56 | static struct xt_target ebt_redirect_tg_reg __read_mostly = { |
57 | .name = "redirect", | |
001a18d3 JE |
58 | .revision = 0, |
59 | .family = NFPROTO_BRIDGE, | |
f2ff525c JE |
60 | .hooks = (1 << NF_BR_NUMHOOKS) | (1 << NF_BR_PRE_ROUTING) | |
61 | (1 << NF_BR_BROUTING), | |
2d06d4a5 JE |
62 | .target = ebt_redirect_tg, |
63 | .checkentry = ebt_redirect_tg_check, | |
fc0e3df4 | 64 | .targetsize = sizeof(struct ebt_redirect_info), |
1da177e4 LT |
65 | .me = THIS_MODULE, |
66 | }; | |
67 | ||
65b4b4e8 | 68 | static int __init ebt_redirect_init(void) |
1da177e4 | 69 | { |
043ef46c | 70 | return xt_register_target(&ebt_redirect_tg_reg); |
1da177e4 LT |
71 | } |
72 | ||
65b4b4e8 | 73 | static void __exit ebt_redirect_fini(void) |
1da177e4 | 74 | { |
043ef46c | 75 | xt_unregister_target(&ebt_redirect_tg_reg); |
1da177e4 LT |
76 | } |
77 | ||
65b4b4e8 AM |
78 | module_init(ebt_redirect_init); |
79 | module_exit(ebt_redirect_fini); | |
f776c4cd | 80 | MODULE_DESCRIPTION("Ebtables: Packet redirection to localhost"); |
1da177e4 | 81 | MODULE_LICENSE("GPL"); |