Release 4.8 net/netfilter/xt_NETMAP.c
/*
* (C) 2000-2001 Svenning Soerensen <svenning@post5.tele.dk>
* 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.
*/
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/ipv6.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_nat.h>
static unsigned int
netmap_tg6(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct nf_nat_range *range = par->targinfo;
struct nf_nat_range newrange;
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
union nf_inet_addr new_addr, netmask;
unsigned int i;
ct = nf_ct_get(skb, &ctinfo);
for (i = 0; i < ARRAY_SIZE(range->min_addr.ip6); i++)
netmask.ip6[i] = ~(range->min_addr.ip6[i] ^
range->max_addr.ip6[i]);
if (par->hooknum == NF_INET_PRE_ROUTING ||
par->hooknum == NF_INET_LOCAL_OUT)
new_addr.in6 = ipv6_hdr(skb)->daddr;
else
new_addr.in6 = ipv6_hdr(skb)->saddr;
for (i = 0; i < ARRAY_SIZE(new_addr.ip6); i++) {
new_addr.ip6[i] &= ~netmask.ip6[i];
new_addr.ip6[i] |= range->min_addr.ip6[i] &
netmask.ip6[i];
}
newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS;
newrange.min_addr = new_addr;
newrange.max_addr = new_addr;
newrange.min_proto = range->min_proto;
newrange.max_proto = range->max_proto;
return nf_nat_setup_info(ct, &newrange, HOOK2MANIP(par->hooknum));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jan engelhardt | jan engelhardt | 249 | 96.51% | 1 | 50.00% |
| harald welte | harald welte | 9 | 3.49% | 1 | 50.00% |
| Total | 258 | 100.00% | 2 | 100.00% |
static int netmap_tg6_checkentry(const struct xt_tgchk_param *par)
{
const struct nf_nat_range *range = par->targinfo;
if (!(range->flags & NF_NAT_RANGE_MAP_IPS))
return -EINVAL;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 25 | 62.50% | 1 | 14.29% |
| jan engelhardt | jan engelhardt | 12 | 30.00% | 4 | 57.14% |
| patrick mchardy | patrick mchardy | 3 | 7.50% | 2 | 28.57% |
| Total | 40 | 100.00% | 7 | 100.00% |
static unsigned int
netmap_tg4(struct sk_buff *skb, const struct xt_action_param *par)
{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
__be32 new_ip, netmask;
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
struct nf_nat_range newrange;
NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING ||
par->hooknum == NF_INET_POST_ROUTING ||
par->hooknum == NF_INET_LOCAL_OUT ||
par->hooknum == NF_INET_LOCAL_IN);
ct = nf_ct_get(skb, &ctinfo);
netmask = ~(mr->range[0].min_ip ^ mr->range[0].max_ip);
if (par->hooknum == NF_INET_PRE_ROUTING ||
par->hooknum == NF_INET_LOCAL_OUT)
new_ip = ip_hdr(skb)->daddr & ~netmask;
else
new_ip = ip_hdr(skb)->saddr & ~netmask;
new_ip |= mr->range[0].min_ip & netmask;
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 = new_ip;
newrange.max_addr.ip = new_ip;
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, HOOK2MANIP(par->hooknum));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 151 | 56.77% | 1 | 7.14% |
| patrick mchardy | patrick mchardy | 81 | 30.45% | 6 | 42.86% |
| jan engelhardt | jan engelhardt | 17 | 6.39% | 3 | 21.43% |
| gary wayne smith | gary wayne smith | 6 | 2.26% | 1 | 7.14% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 6 | 2.26% | 1 | 7.14% |
| herbert xu | herbert xu | 4 | 1.50% | 1 | 7.14% |
| al viro | al viro | 1 | 0.38% | 1 | 7.14% |
| Total | 266 | 100.00% | 14 | 100.00% |
static int netmap_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 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jan engelhardt | jan engelhardt | 75 | 100.00% | 1 | 100.00% |
| Total | 75 | 100.00% | 1 | 100.00% |
static struct xt_target netmap_tg_reg[] __read_mostly = {
{
.name = "NETMAP",
.family = NFPROTO_IPV6,
.revision = 0,
.target = netmap_tg6,
.targetsize = sizeof(struct nf_nat_range),
.table = "nat",
.hooks = (1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_LOCAL_IN),
.checkentry = netmap_tg6_checkentry,
.me = THIS_MODULE,
},
{
.name = "NETMAP",
.family = NFPROTO_IPV4,
.revision = 0,
.target = netmap_tg4,
.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
.table = "nat",
.hooks = (1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_LOCAL_IN),
.checkentry = netmap_tg4_check,
.me = THIS_MODULE,
},
};
static int __init netmap_tg_init(void)
{
return xt_register_targets(netmap_tg_reg, ARRAY_SIZE(netmap_tg_reg));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 12 | 60.00% | 1 | 33.33% |
| jan engelhardt | jan engelhardt | 8 | 40.00% | 2 | 66.67% |
| Total | 20 | 100.00% | 3 | 100.00% |
static void netmap_tg_exit(void)
{
xt_unregister_targets(netmap_tg_reg, ARRAY_SIZE(netmap_tg_reg));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| harald welte | harald welte | 10 | 55.56% | 1 | 33.33% |
| jan engelhardt | jan engelhardt | 8 | 44.44% | 2 | 66.67% |
| Total | 18 | 100.00% | 3 | 100.00% |
module_init(netmap_tg_init);
module_exit(netmap_tg_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Xtables: 1:1 NAT mapping of subnets");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS("ip6t_NETMAP");
MODULE_ALIAS("ipt_NETMAP");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jan engelhardt | jan engelhardt | 500 | 55.68% | 9 | 36.00% |
| harald welte | harald welte | 251 | 27.95% | 1 | 4.00% |
| patrick mchardy | patrick mchardy | 128 | 14.25% | 10 | 40.00% |
| gary wayne smith | gary wayne smith | 6 | 0.67% | 1 | 4.00% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 6 | 0.67% | 1 | 4.00% |
| herbert xu | herbert xu | 4 | 0.45% | 1 | 4.00% |
| jozsef kadlecsik | jozsef kadlecsik | 2 | 0.22% | 1 | 4.00% |
| al viro | al viro | 1 | 0.11% | 1 | 4.00% |
| Total | 898 | 100.00% | 25 | 100.00% |
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