netfilter: ip6tables: add NETMAP target
Signed-off-by: Patrick McHardy <kaber@trash.net>
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@ -156,6 +156,16 @@ config IP6_NF_TARGET_MASQUERADE
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To compile it as a module, choose M here. If unsure, say N.
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config IP6_NF_TARGET_NETMAP
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tristate "NETMAP target support"
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depends on NF_NAT_IPV6
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help
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NETMAP is an implementation of static 1:1 NAT mapping of network
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addresses. It maps the network address part, while keeping the host
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address part intact.
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To compile it as a module, choose M here. If unsure, say N.
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config IP6_NF_TARGET_REDIRECT
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tristate "REDIRECT target support"
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depends on NF_NAT_IPV6
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@ -35,5 +35,6 @@ obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o
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# targets
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obj-$(CONFIG_IP6_NF_TARGET_MASQUERADE) += ip6t_MASQUERADE.o
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obj-$(CONFIG_IP6_NF_TARGET_NETMAP) += ip6t_NETMAP.o
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obj-$(CONFIG_IP6_NF_TARGET_REDIRECT) += ip6t_REDIRECT.o
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obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
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94
net/ipv6/netfilter/ip6t_NETMAP.c
Normal file
94
net/ipv6/netfilter/ip6t_NETMAP.c
Normal file
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@ -0,0 +1,94 @@
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/*
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* Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Based on Svenning Soerensen's IPv4 NETMAP target. Development of IPv6
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* NAT funded by Astaro.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/ipv6.h>
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#include <linux/netfilter.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/netfilter/nf_nat.h>
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static unsigned int
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netmap_tg6(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct nf_nat_range *range = par->targinfo;
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struct nf_nat_range newrange;
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struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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union nf_inet_addr new_addr, netmask;
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unsigned int i;
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ct = nf_ct_get(skb, &ctinfo);
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for (i = 0; i < ARRAY_SIZE(range->min_addr.ip6); i++)
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netmask.ip6[i] = ~(range->min_addr.ip6[i] ^
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range->max_addr.ip6[i]);
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if (par->hooknum == NF_INET_PRE_ROUTING ||
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par->hooknum == NF_INET_LOCAL_OUT)
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new_addr.in6 = ipv6_hdr(skb)->daddr;
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else
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new_addr.in6 = ipv6_hdr(skb)->saddr;
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for (i = 0; i < ARRAY_SIZE(new_addr.ip6); i++) {
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new_addr.ip6[i] &= ~netmask.ip6[i];
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new_addr.ip6[i] |= range->min_addr.ip6[i] &
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netmask.ip6[i];
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}
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newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS;
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newrange.min_addr = new_addr;
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newrange.max_addr = new_addr;
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newrange.min_proto = range->min_proto;
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newrange.max_proto = range->max_proto;
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return nf_nat_setup_info(ct, &newrange, HOOK2MANIP(par->hooknum));
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}
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static int netmap_tg6_checkentry(const struct xt_tgchk_param *par)
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{
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const struct nf_nat_range *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 0;
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}
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static struct xt_target netmap_tg6_reg __read_mostly = {
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.name = "NETMAP",
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.family = NFPROTO_IPV6,
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.target = netmap_tg6,
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.targetsize = sizeof(struct nf_nat_range),
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.table = "nat",
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.hooks = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_POST_ROUTING) |
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(1 << NF_INET_LOCAL_OUT) |
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(1 << NF_INET_LOCAL_IN),
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.checkentry = netmap_tg6_checkentry,
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.me = THIS_MODULE,
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};
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static int __init netmap_tg6_init(void)
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{
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return xt_register_target(&netmap_tg6_reg);
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}
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static void netmap_tg6_exit(void)
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{
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xt_unregister_target(&netmap_tg6_reg);
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}
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module_init(netmap_tg6_init);
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module_exit(netmap_tg6_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Xtables: 1:1 NAT mapping of IPv6 subnets");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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