Release 4.14 net/netfilter/nf_nat_redirect.c
/*
* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
* Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
*
* 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.
*
* 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>
unsigned int
nf_nat_redirect_ipv4(struct sk_buff *skb,
const struct nf_nat_ipv4_multi_range_compat *mr,
unsigned int hooknum)
{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
__be32 newdst;
struct nf_nat_range newrange;
WARN_ON(hooknum != NF_INET_PRE_ROUTING &&
hooknum != NF_INET_LOCAL_OUT);
ct = nf_ct_get(skb, &ctinfo);
WARN_ON(!(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)));
/* Local packets: make them go to loopback */
if (hooknum == NF_INET_LOCAL_OUT) {
newdst = htonl(0x7F000001);
} else {
struct in_device *indev;
struct in_ifaddr *ifa;
newdst = 0;
rcu_read_lock();
indev = __in_dev_get_rcu(skb->dev);
if (indev && indev->ifa_list) {
ifa = indev->ifa_list;
newdst = ifa->ifa_local;
}
rcu_read_unlock();
if (!newdst)
return NF_DROP;
}
/* Transfer from original range. */
memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));
memset(&newrange.max_addr, 0, sizeof(newrange.max_addr));
newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS;
newrange.min_addr.ip = newdst;
newrange.max_addr.ip = newdst;
newrange.min_proto = mr->range[0].min;
newrange.max_proto = mr->range[0].max;
/* Hand modified range to generic setup. */
return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arturo Borrero Gonzalez | 246 | 95.35% | 1 | 33.33% |
| Varsha Rao | 8 | 3.10% | 1 | 33.33% |
| Munehisa Kamata | 4 | 1.55% | 1 | 33.33% |
| Total | 258 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv4);
static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT;
unsigned int
nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
unsigned int hooknum)
{
struct nf_nat_range newrange;
struct in6_addr newdst;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
if (hooknum == NF_INET_LOCAL_OUT) {
newdst = loopback_addr;
} else {
struct inet6_dev *idev;
struct inet6_ifaddr *ifa;
bool addr = false;
rcu_read_lock();
idev = __in6_dev_get(skb->dev);
if (idev != NULL) {
read_lock_bh(&idev->lock);
list_for_each_entry(ifa, &idev->addr_list, if_list) {
newdst = ifa->addr;
addr = true;
break;
}
read_unlock_bh(&idev->lock);
}
rcu_read_unlock();
if (!addr)
return NF_DROP;
}
newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS;
newrange.min_addr.in6 = newdst;
newrange.max_addr.in6 = newdst;
newrange.min_proto = range->min_proto;
newrange.max_proto = range->max_proto;
return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pablo Neira Ayuso | 183 | 91.96% | 1 | 50.00% |
| Liping Zhang | 16 | 8.04% | 1 | 50.00% |
| Total | 199 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv6);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arturo Borrero Gonzalez | 306 | 57.30% | 1 | 20.00% |
| Pablo Neira Ayuso | 200 | 37.45% | 1 | 20.00% |
| Liping Zhang | 16 | 3.00% | 1 | 20.00% |
| Varsha Rao | 8 | 1.50% | 1 | 20.00% |
| Munehisa Kamata | 4 | 0.75% | 1 | 20.00% |
| Total | 534 | 100.00% | 5 | 100.00% |
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