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- /* Masquerade. Simple mapping which alters range to a local IP address
- (depending on route). */
- /* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
- *
- * 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.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/types.h>
- #include <linux/inetdevice.h>
- #include <linux/ip.h>
- #include <linux/timer.h>
- #include <linux/module.h>
- #include <linux/netfilter.h>
- #include <net/protocol.h>
- #include <net/ip.h>
- #include <net/checksum.h>
- #include <net/route.h>
- #include <linux/netfilter_ipv4.h>
- #include <linux/netfilter/x_tables.h>
- #include <net/netfilter/nf_nat.h>
- #include <net/netfilter/ipv4/nf_nat_masquerade.h>
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
- MODULE_DESCRIPTION("Xtables: automatic-address SNAT");
- /* FIXME: Multiple targets. --RR */
- static int masquerade_tg_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 0;
- }
- static unsigned int
- masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par)
- {
- struct nf_nat_range range;
- const struct nf_nat_ipv4_multi_range_compat *mr;
- mr = par->targinfo;
- range.flags = mr->range[0].flags;
- range.min_proto = mr->range[0].min;
- range.max_proto = mr->range[0].max;
- return nf_nat_masquerade_ipv4(skb, par->hooknum, &range, par->out);
- }
- static struct xt_target masquerade_tg_reg __read_mostly = {
- .name = "MASQUERADE",
- .family = NFPROTO_IPV4,
- .target = masquerade_tg,
- .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
- .table = "nat",
- .hooks = 1 << NF_INET_POST_ROUTING,
- .checkentry = masquerade_tg_check,
- .me = THIS_MODULE,
- };
- static int __init masquerade_tg_init(void)
- {
- int ret;
- ret = xt_register_target(&masquerade_tg_reg);
- if (ret == 0)
- nf_nat_masquerade_ipv4_register_notifier();
- return ret;
- }
- static void __exit masquerade_tg_exit(void)
- {
- xt_unregister_target(&masquerade_tg_reg);
- nf_nat_masquerade_ipv4_unregister_notifier();
- }
- module_init(masquerade_tg_init);
- module_exit(masquerade_tg_exit);
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