d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
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* Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
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*
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* Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6
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* NAT funded by Astaro.
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*/
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#include <linux/if.h>
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#include <linux/inetdevice.h>
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#include <linux/ip.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/netfilter.h>
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#include <linux/types.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netfilter/x_tables.h>
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#include <net/addrconf.h>
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#include <net/checksum.h>
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#include <net/protocol.h>
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#include <net/netfilter/nf_nat.h>
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#include <net/netfilter/nf_nat_redirect.h>
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static unsigned int
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redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par)
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{
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return nf_nat_redirect_ipv6(skb, par->targinfo, xt_hooknum(par));
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}
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static int redirect_tg6_checkentry(const struct xt_tgchk_param *par)
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{
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const struct nf_nat_range2 *range = par->targinfo;
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if (range->flags & NF_NAT_RANGE_MAP_IPS)
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return -EINVAL;
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return nf_ct_netns_get(par->net, par->family);
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}
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static void redirect_tg_destroy(const struct xt_tgdtor_param *par)
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{
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nf_ct_netns_put(par->net, par->family);
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}
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/* FIXME: Take multiple ranges --RR */
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static int redirect_tg4_check(const struct xt_tgchk_param *par)
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{
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const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
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if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) {
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pr_debug("bad MAP_IPS.\n");
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return -EINVAL;
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}
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if (mr->rangesize != 1) {
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pr_debug("bad rangesize %u.\n", mr->rangesize);
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return -EINVAL;
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}
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return nf_ct_netns_get(par->net, par->family);
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}
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static unsigned int
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redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par)
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{
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return nf_nat_redirect_ipv4(skb, par->targinfo, xt_hooknum(par));
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}
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static struct xt_target redirect_tg_reg[] __read_mostly = {
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{
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.name = "REDIRECT",
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.family = NFPROTO_IPV6,
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.revision = 0,
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.table = "nat",
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.checkentry = redirect_tg6_checkentry,
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.destroy = redirect_tg_destroy,
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.target = redirect_tg6,
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.targetsize = sizeof(struct nf_nat_range),
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.hooks = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_OUT),
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.me = THIS_MODULE,
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},
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{
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.name = "REDIRECT",
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.family = NFPROTO_IPV4,
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.revision = 0,
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.table = "nat",
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.target = redirect_tg4,
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.checkentry = redirect_tg4_check,
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.destroy = redirect_tg_destroy,
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.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
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.hooks = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_OUT),
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.me = THIS_MODULE,
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},
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};
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static int __init redirect_tg_init(void)
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{
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return xt_register_targets(redirect_tg_reg,
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ARRAY_SIZE(redirect_tg_reg));
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}
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static void __exit redirect_tg_exit(void)
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{
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xt_unregister_targets(redirect_tg_reg, ARRAY_SIZE(redirect_tg_reg));
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}
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module_init(redirect_tg_init);
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module_exit(redirect_tg_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_DESCRIPTION("Xtables: Connection redirection to localhost");
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MODULE_ALIAS("ip6t_REDIRECT");
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MODULE_ALIAS("ipt_REDIRECT");
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