123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118 |
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
- * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
- *
- * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6
- * NAT funded by Astaro.
- */
- #include <linux/if.h>
- #include <linux/inetdevice.h>
- #include <linux/ip.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/netdevice.h>
- #include <linux/netfilter.h>
- #include <linux/types.h>
- #include <linux/netfilter_ipv4.h>
- #include <linux/netfilter_ipv6.h>
- #include <linux/netfilter/x_tables.h>
- #include <net/addrconf.h>
- #include <net/checksum.h>
- #include <net/protocol.h>
- #include <net/netfilter/nf_nat.h>
- #include <net/netfilter/nf_nat_redirect.h>
- static unsigned int
- redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par)
- {
- return nf_nat_redirect_ipv6(skb, par->targinfo, xt_hooknum(par));
- }
- static int redirect_tg6_checkentry(const struct xt_tgchk_param *par)
- {
- const struct nf_nat_range2 *range = par->targinfo;
- if (range->flags & NF_NAT_RANGE_MAP_IPS)
- return -EINVAL;
- return nf_ct_netns_get(par->net, par->family);
- }
- static void redirect_tg_destroy(const struct xt_tgdtor_param *par)
- {
- nf_ct_netns_put(par->net, par->family);
- }
- /* FIXME: Take multiple ranges --RR */
- static int redirect_tg4_check(const struct xt_tgchk_param *par)
- {
- const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
- if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) {
- pr_debug("bad MAP_IPS.\n");
- return -EINVAL;
- }
- if (mr->rangesize != 1) {
- pr_debug("bad rangesize %u.\n", mr->rangesize);
- return -EINVAL;
- }
- return nf_ct_netns_get(par->net, par->family);
- }
- static unsigned int
- redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par)
- {
- return nf_nat_redirect_ipv4(skb, par->targinfo, xt_hooknum(par));
- }
- static struct xt_target redirect_tg_reg[] __read_mostly = {
- {
- .name = "REDIRECT",
- .family = NFPROTO_IPV6,
- .revision = 0,
- .table = "nat",
- .checkentry = redirect_tg6_checkentry,
- .destroy = redirect_tg_destroy,
- .target = redirect_tg6,
- .targetsize = sizeof(struct nf_nat_range),
- .hooks = (1 << NF_INET_PRE_ROUTING) |
- (1 << NF_INET_LOCAL_OUT),
- .me = THIS_MODULE,
- },
- {
- .name = "REDIRECT",
- .family = NFPROTO_IPV4,
- .revision = 0,
- .table = "nat",
- .target = redirect_tg4,
- .checkentry = redirect_tg4_check,
- .destroy = redirect_tg_destroy,
- .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
- .hooks = (1 << NF_INET_PRE_ROUTING) |
- (1 << NF_INET_LOCAL_OUT),
- .me = THIS_MODULE,
- },
- };
- static int __init redirect_tg_init(void)
- {
- return xt_register_targets(redirect_tg_reg,
- ARRAY_SIZE(redirect_tg_reg));
- }
- static void __exit redirect_tg_exit(void)
- {
- xt_unregister_targets(redirect_tg_reg, ARRAY_SIZE(redirect_tg_reg));
- }
- module_init(redirect_tg_init);
- module_exit(redirect_tg_exit);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
- MODULE_DESCRIPTION("Xtables: Connection redirection to localhost");
- MODULE_ALIAS("ip6t_REDIRECT");
- MODULE_ALIAS("ipt_REDIRECT");
|