projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 2cbc78a2 JE |
1 | /* |
| 2 | * (C) 1999-2001 Paul `Rusty' Russell | |
| 3 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> | |
| 4 | * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6 | |
| 11 | * NAT funded by Astaro. | |
| 12 | */ | |
| 13 | ||
| 14 | #include <linux/if.h> | |
| 15 | #include <linux/inetdevice.h> | |
| 16 | #include <linux/ip.h> | |
| 17 | #include <linux/kernel.h> | |
| 18 | #include <linux/module.h> | |
| 19 | #include <linux/netdevice.h> | |
| 20 | #include <linux/netfilter.h> | |
| 21 | #include <linux/types.h> | |
| 22 | #include <linux/netfilter_ipv4.h> | |
| 23 | #include <linux/netfilter_ipv6.h> | |
| 24 | #include <linux/netfilter/x_tables.h> | |
| 25 | #include <net/addrconf.h> | |
| 26 | #include <net/checksum.h> | |
| 27 | #include <net/protocol.h> | |
| 28 | #include <net/netfilter/nf_nat.h> | |
| 8b13eddf | 29 | #include <net/netfilter/ipv4/nf_nat_redirect.h> |
| 9de920ed | 30 | #include <net/netfilter/ipv6/nf_nat_redirect.h> |
| 2cbc78a2 JE |
31 | |
| 32 | static unsigned int | |
| 33 | redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par) | |
| 34 | { | |
| 9de920ed | 35 | return nf_nat_redirect_ipv6(skb, par->targinfo, par->hooknum); |
| 2cbc78a2 JE |
36 | } |
| 37 | ||
| 38 | static int redirect_tg6_checkentry(const struct xt_tgchk_param *par) | |
| 39 | { | |
| 40 | const struct nf_nat_range *range = par->targinfo; | |
| 41 | ||
| 42 | if (range->flags & NF_NAT_RANGE_MAP_IPS) | |
| 43 | return -EINVAL; | |
| 44 | return 0; | |
| 45 | } | |
| 46 | ||
| 47 | /* FIXME: Take multiple ranges --RR */ | |
| 48 | static int redirect_tg4_check(const struct xt_tgchk_param *par) | |
| 49 | { | |
| 50 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; | |
| 51 | ||
| 52 | if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) { | |
| 53 | pr_debug("bad MAP_IPS.\n"); | |
| 54 | return -EINVAL; | |
| 55 | } | |
| 56 | if (mr->rangesize != 1) { | |
| 57 | pr_debug("bad rangesize %u.\n", mr->rangesize); | |
| 58 | return -EINVAL; | |
| 59 | } | |
| 60 | return 0; | |
| 61 | } | |
| 62 | ||
| 63 | static unsigned int | |
| 64 | redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par) | |
| 65 | { | |
| 8b13eddf | 66 | return nf_nat_redirect_ipv4(skb, par->targinfo, par->hooknum); |
| 2cbc78a2 JE |
67 | } |
| 68 | ||
| 69 | static struct xt_target redirect_tg_reg[] __read_mostly = { | |
| 70 | { | |
| 71 | .name = "REDIRECT", | |
| 72 | .family = NFPROTO_IPV6, | |
| 73 | .revision = 0, | |
| 74 | .table = "nat", | |
| 75 | .checkentry = redirect_tg6_checkentry, | |
| 76 | .target = redirect_tg6, | |
| 77 | .targetsize = sizeof(struct nf_nat_range), | |
| 78 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
| 79 | (1 << NF_INET_LOCAL_OUT), | |
| 80 | .me = THIS_MODULE, | |
| 81 | }, | |
| 82 | { | |
| 83 | .name = "REDIRECT", | |
| 84 | .family = NFPROTO_IPV4, | |
| 85 | .revision = 0, | |
| 86 | .table = "nat", | |
| 87 | .target = redirect_tg4, | |
| 88 | .checkentry = redirect_tg4_check, | |
| 89 | .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), | |
| 90 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
| 91 | (1 << NF_INET_LOCAL_OUT), | |
| 92 | .me = THIS_MODULE, | |
| 93 | }, | |
| 94 | }; | |
| 95 | ||
| 96 | static int __init redirect_tg_init(void) | |
| 97 | { | |
| 98 | return xt_register_targets(redirect_tg_reg, | |
| 99 | ARRAY_SIZE(redirect_tg_reg)); | |
| 100 | } | |
| 101 | ||
| 102 | static void __exit redirect_tg_exit(void) | |
| 103 | { | |
| 104 | xt_unregister_targets(redirect_tg_reg, ARRAY_SIZE(redirect_tg_reg)); | |
| 105 | } | |
| 106 | ||
| 107 | module_init(redirect_tg_init); | |
| 108 | module_exit(redirect_tg_exit); | |
| 109 | ||
| 110 | MODULE_LICENSE("GPL"); | |
| 111 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
| 112 | MODULE_DESCRIPTION("Xtables: Connection redirection to localhost"); | |
| 113 | MODULE_ALIAS("ip6t_REDIRECT"); | |
| 114 | MODULE_ALIAS("ipt_REDIRECT"); |