[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv4 / netfilter / iptable_raw.c

/*
 * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
 *
 * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
 */
#include <linux/module.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/slab.h>
#include <net/ip.h>

#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))

static const struct xt_table packet_raw = {
	.name = "raw",
	.valid_hooks =  RAW_VALID_HOOKS,
	.me = THIS_MODULE,
	.af = NFPROTO_IPV4,
	.priority = NF_IP_PRI_RAW,
};

/* The work comes in here from netfilter.c. */
static unsigned int
iptable_raw_hook(unsigned int hook, struct sk_buff *skb,
		 const struct net_device *in, const struct net_device *out,
		 int (*okfn)(struct sk_buff *))
{
	const struct net *net;

	if (hook == NF_INET_LOCAL_OUT && 
	    (skb->len < sizeof(struct iphdr) ||
	     ip_hdrlen(skb) < sizeof(struct iphdr)))
		/* root is playing with raw sockets. */
		return NF_ACCEPT;

	net = dev_net((in != NULL) ? in : out);
	return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_raw);
}

static struct nf_hook_ops *rawtable_ops __read_mostly;

static int __net_init iptable_raw_net_init(struct net *net)
{
	struct ipt_replace *repl;

	repl = ipt_alloc_initial_table(&packet_raw);
	if (repl == NULL)
		return -ENOMEM;
	net->ipv4.iptable_raw =
		ipt_register_table(net, &packet_raw, repl);
	kfree(repl);
	if (IS_ERR(net->ipv4.iptable_raw))
		return PTR_ERR(net->ipv4.iptable_raw);
	return 0;
}

static void __net_exit iptable_raw_net_exit(struct net *net)
{
	ipt_unregister_table(net, net->ipv4.iptable_raw);
}

static struct pernet_operations iptable_raw_net_ops = {
	.init = iptable_raw_net_init,
	.exit = iptable_raw_net_exit,
};

static int __init iptable_raw_init(void)
{
	int ret;

	ret = register_pernet_subsys(&iptable_raw_net_ops);
	if (ret < 0)
		return ret;

	/* Register hooks */
	rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook);
	if (IS_ERR(rawtable_ops)) {
		ret = PTR_ERR(rawtable_ops);
		goto cleanup_table;
	}

	return ret;

 cleanup_table:
	unregister_pernet_subsys(&iptable_raw_net_ops);
	return ret;
}

static void __exit iptable_raw_fini(void)
{
	xt_hook_unlink(&packet_raw, rawtable_ops);
	unregister_pernet_subsys(&iptable_raw_net_ops);
}

module_init(iptable_raw_init);
module_exit(iptable_raw_fini);
MODULE_LICENSE("GPL");
Commit	Line	Data
e905a9ed	1	/*
1da177e4 LT	2	* 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
	3	*
	4	* Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
	5	*/
	6	#include <linux/module.h>
	7	#include <linux/netfilter_ipv4/ip_tables.h>
5a0e3ad6	8	#include <linux/slab.h>
802169a4	9	#include <net/ip.h>
1da177e4	10
6e23ae2a	11	#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) \| (1 << NF_INET_LOCAL_OUT))
1da177e4	12
35aad0ff	13	static const struct xt_table packet_raw = {
e905a9ed YH	14	.name = "raw",
e905a9ed YH	15	.valid_hooks = RAW_VALID_HOOKS,
2e4e6a17	16	.me = THIS_MODULE,
f88e6a8a	17	.af = NFPROTO_IPV4,
2b95efe7	18	.priority = NF_IP_PRI_RAW,
1da177e4 LT	19	};
	20
	21	/* The work comes in here from netfilter.c. */
	22	static unsigned int
737535c5 JE	23	iptable_raw_hook(unsigned int hook, struct sk_buff *skb,
	24	const struct net_device in, const struct net_device out,
	25	int (okfn)(struct sk_buff ))
1da177e4	26	{
2b21e051	27	const struct net *net;
1da177e4	28
2b21e051 JE	29	if (hook == NF_INET_LOCAL_OUT &&
	30	(skb->len < sizeof(struct iphdr) \|\|
	31	ip_hdrlen(skb) < sizeof(struct iphdr)))
	32	/* root is playing with raw sockets. */
802169a4	33	return NF_ACCEPT;
2b21e051 JE	34
	35	net = dev_net((in != NULL) ? in : out);
	36	return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_raw);
802169a4 PM	37	}
802169a4 PM	38
2b95efe7	39	static struct nf_hook_ops *rawtable_ops __read_mostly;
1da177e4	40
9335f047 AD	41	static int __net_init iptable_raw_net_init(struct net *net)
9335f047 AD	42	{
e3eaa991 JE	43	struct ipt_replace *repl;
	44
	45	repl = ipt_alloc_initial_table(&packet_raw);
	46	if (repl == NULL)
	47	return -ENOMEM;
9335f047	48	net->ipv4.iptable_raw =
e3eaa991 JE	49	ipt_register_table(net, &packet_raw, repl);
e3eaa991 JE	50	kfree(repl);
9335f047 AD	51	if (IS_ERR(net->ipv4.iptable_raw))
	52	return PTR_ERR(net->ipv4.iptable_raw);
	53	return 0;
	54	}
	55
	56	static void __net_exit iptable_raw_net_exit(struct net *net)
	57	{
f54e9367	58	ipt_unregister_table(net, net->ipv4.iptable_raw);
9335f047 AD	59	}
	60
	61	static struct pernet_operations iptable_raw_net_ops = {
	62	.init = iptable_raw_net_init,
	63	.exit = iptable_raw_net_exit,
	64	};
	65
65b4b4e8	66	static int __init iptable_raw_init(void)
1da177e4 LT	67	{
	68	int ret;
	69
9335f047 AD	70	ret = register_pernet_subsys(&iptable_raw_net_ops);
	71	if (ret < 0)
	72	return ret;
1da177e4 LT	73
1da177e4 LT	74	/* Register hooks */
2b95efe7 JE	75	rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook);
	76	if (IS_ERR(rawtable_ops)) {
	77	ret = PTR_ERR(rawtable_ops);
1da177e4	78	goto cleanup_table;
2b95efe7	79	}
1da177e4	80
1da177e4 LT	81	return ret;
1da177e4 LT	82
1da177e4	83	cleanup_table:
9335f047	84	unregister_pernet_subsys(&iptable_raw_net_ops);
1da177e4 LT	85	return ret;
	86	}
	87
65b4b4e8	88	static void __exit iptable_raw_fini(void)
1da177e4	89	{
2b95efe7	90	xt_hook_unlink(&packet_raw, rawtable_ops);
9335f047	91	unregister_pernet_subsys(&iptable_raw_net_ops);
1da177e4 LT	92	}
1da177e4 LT	93
65b4b4e8 AM	94	module_init(iptable_raw_init);
65b4b4e8 AM	95	module_exit(iptable_raw_fini);
1da177e4	96	MODULE_LICENSE("GPL");