1 // SPDX-License-Identifier: GPL-2.0-only
3 * (C) 1999-2001 Paul `Rusty' Russell
4 * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
5 * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
7 * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6
8 * NAT funded by Astaro.
12 #include <linux/inetdevice.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/netdevice.h>
17 #include <linux/netfilter.h>
18 #include <linux/types.h>
19 #include <linux/netfilter_ipv4.h>
20 #include <linux/netfilter_ipv6.h>
21 #include <linux/netfilter/x_tables.h>
22 #include <net/addrconf.h>
23 #include <net/checksum.h>
24 #include <net/protocol.h>
25 #include <net/netfilter/nf_nat.h>
26 #include <net/netfilter/nf_nat_redirect.h>
29 redirect_tg6(struct sk_buff
*skb
, const struct xt_action_param
*par
)
31 return nf_nat_redirect_ipv6(skb
, par
->targinfo
, xt_hooknum(par
));
34 static int redirect_tg6_checkentry(const struct xt_tgchk_param
*par
)
36 const struct nf_nat_range2
*range
= par
->targinfo
;
38 if (range
->flags
& NF_NAT_RANGE_MAP_IPS
)
41 return nf_ct_netns_get(par
->net
, par
->family
);
44 static void redirect_tg_destroy(const struct xt_tgdtor_param
*par
)
46 nf_ct_netns_put(par
->net
, par
->family
);
49 /* FIXME: Take multiple ranges --RR */
50 static int redirect_tg4_check(const struct xt_tgchk_param
*par
)
52 const struct nf_nat_ipv4_multi_range_compat
*mr
= par
->targinfo
;
54 if (mr
->range
[0].flags
& NF_NAT_RANGE_MAP_IPS
) {
55 pr_debug("bad MAP_IPS.\n");
58 if (mr
->rangesize
!= 1) {
59 pr_debug("bad rangesize %u.\n", mr
->rangesize
);
62 return nf_ct_netns_get(par
->net
, par
->family
);
66 redirect_tg4(struct sk_buff
*skb
, const struct xt_action_param
*par
)
68 return nf_nat_redirect_ipv4(skb
, par
->targinfo
, xt_hooknum(par
));
71 static struct xt_target redirect_tg_reg
[] __read_mostly
= {
74 .family
= NFPROTO_IPV6
,
77 .checkentry
= redirect_tg6_checkentry
,
78 .destroy
= redirect_tg_destroy
,
79 .target
= redirect_tg6
,
80 .targetsize
= sizeof(struct nf_nat_range
),
81 .hooks
= (1 << NF_INET_PRE_ROUTING
) |
82 (1 << NF_INET_LOCAL_OUT
),
87 .family
= NFPROTO_IPV4
,
90 .target
= redirect_tg4
,
91 .checkentry
= redirect_tg4_check
,
92 .destroy
= redirect_tg_destroy
,
93 .targetsize
= sizeof(struct nf_nat_ipv4_multi_range_compat
),
94 .hooks
= (1 << NF_INET_PRE_ROUTING
) |
95 (1 << NF_INET_LOCAL_OUT
),
100 static int __init
redirect_tg_init(void)
102 return xt_register_targets(redirect_tg_reg
,
103 ARRAY_SIZE(redirect_tg_reg
));
106 static void __exit
redirect_tg_exit(void)
108 xt_unregister_targets(redirect_tg_reg
, ARRAY_SIZE(redirect_tg_reg
));
111 module_init(redirect_tg_init
);
112 module_exit(redirect_tg_exit
);
114 MODULE_LICENSE("GPL");
115 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
116 MODULE_DESCRIPTION("Xtables: Connection redirection to localhost");
117 MODULE_ALIAS("ip6t_REDIRECT");
118 MODULE_ALIAS("ipt_REDIRECT");