https://github.com/torvalds/linux
Tip revision: de46c33745f5e2ad594c72f2cf5f490861b16ce1 authored by Linus Torvalds on 26 April 2007, 03:08:32 UTC
Linux 2.6.21
Linux 2.6.21
Tip revision: de46c33
iptable_mangle.c
/*
* This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
*
* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
* Copyright (C) 2000-2004 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.
*
* Extended to all five netfilter hooks by Brad Chapman & Harald Welte
*/
#include <linux/module.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/route.h>
#include <linux/ip.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("iptables mangle table");
#define MANGLE_VALID_HOOKS ((1 << NF_IP_PRE_ROUTING) | \
(1 << NF_IP_LOCAL_IN) | \
(1 << NF_IP_FORWARD) | \
(1 << NF_IP_LOCAL_OUT) | \
(1 << NF_IP_POST_ROUTING))
/* Ouch - five different hooks? Maybe this should be a config option..... -- BC */
static struct
{
struct ipt_replace repl;
struct ipt_standard entries[5];
struct ipt_error term;
} initial_table __initdata
= { { "mangle", MANGLE_VALID_HOOKS, 6,
sizeof(struct ipt_standard) * 5 + sizeof(struct ipt_error),
{ [NF_IP_PRE_ROUTING] = 0,
[NF_IP_LOCAL_IN] = sizeof(struct ipt_standard),
[NF_IP_FORWARD] = sizeof(struct ipt_standard) * 2,
[NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 3,
[NF_IP_POST_ROUTING] = sizeof(struct ipt_standard) * 4 },
{ [NF_IP_PRE_ROUTING] = 0,
[NF_IP_LOCAL_IN] = sizeof(struct ipt_standard),
[NF_IP_FORWARD] = sizeof(struct ipt_standard) * 2,
[NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 3,
[NF_IP_POST_ROUTING] = sizeof(struct ipt_standard) * 4 },
0, NULL, { } },
{
/* PRE_ROUTING */
{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
0,
sizeof(struct ipt_entry),
sizeof(struct ipt_standard),
0, { 0, 0 }, { } },
{ { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
-NF_ACCEPT - 1 } },
/* LOCAL_IN */
{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
0,
sizeof(struct ipt_entry),
sizeof(struct ipt_standard),
0, { 0, 0 }, { } },
{ { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
-NF_ACCEPT - 1 } },
/* FORWARD */
{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
0,
sizeof(struct ipt_entry),
sizeof(struct ipt_standard),
0, { 0, 0 }, { } },
{ { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
-NF_ACCEPT - 1 } },
/* LOCAL_OUT */
{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
0,
sizeof(struct ipt_entry),
sizeof(struct ipt_standard),
0, { 0, 0 }, { } },
{ { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
-NF_ACCEPT - 1 } },
/* POST_ROUTING */
{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
0,
sizeof(struct ipt_entry),
sizeof(struct ipt_standard),
0, { 0, 0 }, { } },
{ { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
-NF_ACCEPT - 1 } },
},
/* ERROR */
{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
0,
sizeof(struct ipt_entry),
sizeof(struct ipt_error),
0, { 0, 0 }, { } },
{ { { { IPT_ALIGN(sizeof(struct ipt_error_target)), IPT_ERROR_TARGET } },
{ } },
"ERROR"
}
}
};
static struct xt_table packet_mangler = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
.lock = RW_LOCK_UNLOCKED,
.me = THIS_MODULE,
.af = AF_INET,
};
/* The work comes in here from netfilter.c. */
static unsigned int
ipt_route_hook(unsigned int hook,
struct sk_buff **pskb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
return ipt_do_table(pskb, hook, in, out, &packet_mangler);
}
static unsigned int
ipt_local_hook(unsigned int hook,
struct sk_buff **pskb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
unsigned int ret;
u_int8_t tos;
__be32 saddr, daddr;
u_int32_t mark;
/* root is playing with raw sockets. */
if ((*pskb)->len < sizeof(struct iphdr)
|| (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
if (net_ratelimit())
printk("ipt_hook: happy cracking.\n");
return NF_ACCEPT;
}
/* Save things which could affect route */
mark = (*pskb)->mark;
saddr = (*pskb)->nh.iph->saddr;
daddr = (*pskb)->nh.iph->daddr;
tos = (*pskb)->nh.iph->tos;
ret = ipt_do_table(pskb, hook, in, out, &packet_mangler);
/* Reroute for ANY change. */
if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE
&& ((*pskb)->nh.iph->saddr != saddr
|| (*pskb)->nh.iph->daddr != daddr
|| (*pskb)->mark != mark
|| (*pskb)->nh.iph->tos != tos))
if (ip_route_me_harder(pskb, RTN_UNSPEC))
ret = NF_DROP;
return ret;
}
static struct nf_hook_ops ipt_ops[] = {
{
.hook = ipt_route_hook,
.owner = THIS_MODULE,
.pf = PF_INET,
.hooknum = NF_IP_PRE_ROUTING,
.priority = NF_IP_PRI_MANGLE,
},
{
.hook = ipt_route_hook,
.owner = THIS_MODULE,
.pf = PF_INET,
.hooknum = NF_IP_LOCAL_IN,
.priority = NF_IP_PRI_MANGLE,
},
{
.hook = ipt_route_hook,
.owner = THIS_MODULE,
.pf = PF_INET,
.hooknum = NF_IP_FORWARD,
.priority = NF_IP_PRI_MANGLE,
},
{
.hook = ipt_local_hook,
.owner = THIS_MODULE,
.pf = PF_INET,
.hooknum = NF_IP_LOCAL_OUT,
.priority = NF_IP_PRI_MANGLE,
},
{
.hook = ipt_route_hook,
.owner = THIS_MODULE,
.pf = PF_INET,
.hooknum = NF_IP_POST_ROUTING,
.priority = NF_IP_PRI_MANGLE,
},
};
static int __init iptable_mangle_init(void)
{
int ret;
/* Register table */
ret = ipt_register_table(&packet_mangler, &initial_table.repl);
if (ret < 0)
return ret;
/* Register hooks */
ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
if (ret < 0)
goto cleanup_table;
return ret;
cleanup_table:
ipt_unregister_table(&packet_mangler);
return ret;
}
static void __exit iptable_mangle_fini(void)
{
nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
ipt_unregister_table(&packet_mangler);
}
module_init(iptable_mangle_init);
module_exit(iptable_mangle_fini);