net, netfilter: Remove redundant goto in ebt_ulog_packet
[linux-2.6.git] / net / bridge / netfilter / ebt_redirect.c
1 /*
2  *  ebt_redirect
3  *
4  *      Authors:
5  *      Bart De Schuymer <bdschuym@pandora.be>
6  *
7  *  April, 2002
8  *
9  */
10 #include <linux/module.h>
11 #include <net/sock.h>
12 #include "../br_private.h"
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/x_tables.h>
15 #include <linux/netfilter_bridge/ebtables.h>
16 #include <linux/netfilter_bridge/ebt_redirect.h>
17
18 static unsigned int
19 ebt_redirect_tg(struct sk_buff *skb, const struct xt_action_param *par)
20 {
21         const struct ebt_redirect_info *info = par->targinfo;
22
23         if (!skb_make_writable(skb, 0))
24                 return EBT_DROP;
25
26         if (par->hooknum != NF_BR_BROUTING)
27                 /* rcu_read_lock()ed by nf_hook_slow */
28                 memcpy(eth_hdr(skb)->h_dest,
29                        br_port_get_rcu(par->in)->br->dev->dev_addr, ETH_ALEN);
30         else
31                 memcpy(eth_hdr(skb)->h_dest, par->in->dev_addr, ETH_ALEN);
32         skb->pkt_type = PACKET_HOST;
33         return info->target;
34 }
35
36 static int ebt_redirect_tg_check(const struct xt_tgchk_param *par)
37 {
38         const struct ebt_redirect_info *info = par->targinfo;
39         unsigned int hook_mask;
40
41         if (BASE_CHAIN && info->target == EBT_RETURN)
42                 return -EINVAL;
43
44         hook_mask = par->hook_mask & ~(1 << NF_BR_NUMHOOKS);
45         if ((strcmp(par->table, "nat") != 0 ||
46             hook_mask & ~(1 << NF_BR_PRE_ROUTING)) &&
47             (strcmp(par->table, "broute") != 0 ||
48             hook_mask & ~(1 << NF_BR_BROUTING)))
49                 return -EINVAL;
50         if (INVALID_TARGET)
51                 return -EINVAL;
52         return 0;
53 }
54
55 static struct xt_target ebt_redirect_tg_reg __read_mostly = {
56         .name           = "redirect",
57         .revision       = 0,
58         .family         = NFPROTO_BRIDGE,
59         .hooks          = (1 << NF_BR_NUMHOOKS) | (1 << NF_BR_PRE_ROUTING) |
60                           (1 << NF_BR_BROUTING),
61         .target         = ebt_redirect_tg,
62         .checkentry     = ebt_redirect_tg_check,
63         .targetsize     = sizeof(struct ebt_redirect_info),
64         .me             = THIS_MODULE,
65 };
66
67 static int __init ebt_redirect_init(void)
68 {
69         return xt_register_target(&ebt_redirect_tg_reg);
70 }
71
72 static void __exit ebt_redirect_fini(void)
73 {
74         xt_unregister_target(&ebt_redirect_tg_reg);
75 }
76
77 module_init(ebt_redirect_init);
78 module_exit(ebt_redirect_fini);
79 MODULE_DESCRIPTION("Ebtables: Packet redirection to localhost");
80 MODULE_LICENSE("GPL");