[net-next-2.6.git] / net / ipv6 / netfilter.c

#include <linux/config.h>
#include <linux/init.h>

#ifdef CONFIG_NETFILTER

#include <linux/kernel.h>
#include <linux/ipv6.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
#include <net/dst.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <net/xfrm.h>

int ip6_route_me_harder(struct sk_buff *skb)
{
	struct ipv6hdr *iph = skb->nh.ipv6h;
	struct dst_entry *dst;
	struct flowi fl = {
		.oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
		.nl_u =
		{ .ip6_u =
		  { .daddr = iph->daddr,
		    .saddr = iph->saddr, } },
	};

	dst = ip6_route_output(skb->sk, &fl);

#ifdef CONFIG_XFRM
	if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
	    xfrm_decode_session(skb, &fl, AF_INET6) == 0)
		if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
			return -1;
#endif

	if (dst->error) {
		IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
		LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
		dst_release(dst);
		return -EINVAL;
	}

	/* Drop old route. */
	dst_release(skb->dst);

	skb->dst = dst;
	return 0;
}
EXPORT_SYMBOL(ip6_route_me_harder);

/*
 * Extra routing may needed on local out, as the QUEUE target never
 * returns control to the table.
 */

struct ip6_rt_info {
	struct in6_addr daddr;
	struct in6_addr saddr;
};

static void save(const struct sk_buff *skb, struct nf_info *info)
{
	struct ip6_rt_info *rt_info = nf_info_reroute(info);

	if (info->hook == NF_IP6_LOCAL_OUT) {
		struct ipv6hdr *iph = skb->nh.ipv6h;

		rt_info->daddr = iph->daddr;
		rt_info->saddr = iph->saddr;
	}
}

static int reroute(struct sk_buff **pskb, const struct nf_info *info)
{
	struct ip6_rt_info *rt_info = nf_info_reroute(info);

	if (info->hook == NF_IP6_LOCAL_OUT) {
		struct ipv6hdr *iph = (*pskb)->nh.ipv6h;
		if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
		    !ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
			return ip6_route_me_harder(*pskb);
	}
	return 0;
}

static struct nf_queue_rerouter ip6_reroute = {
	.rer_size	= sizeof(struct ip6_rt_info),
	.save 		= &save,
	.reroute	= &reroute,
};

int __init ipv6_netfilter_init(void)
{
	return nf_register_queue_rerouter(PF_INET6, &ip6_reroute);
}

void ipv6_netfilter_fini(void)
{
	nf_unregister_queue_rerouter(PF_INET6);
}

#else /* CONFIG_NETFILTER */
int __init ipv6_netfilter_init(void)
{
	return 0;
}

void ipv6_netfilter_fini(void)
{
}
#endif /* CONFIG_NETFILTER */
Commit	Line	Data
020b4c12 HW	1	#include <linux/config.h>
	2	#include <linux/init.h>
	3
	4	#ifdef CONFIG_NETFILTER
	5
	6	#include <linux/kernel.h>
	7	#include <linux/ipv6.h>
2cc7d573 HW	8	#include <linux/netfilter.h>
2cc7d573 HW	9	#include <linux/netfilter_ipv6.h>
020b4c12 HW	10	#include <net/dst.h>
	11	#include <net/ipv6.h>
	12	#include <net/ip6_route.h>
3e3850e9	13	#include <net/xfrm.h>
020b4c12 HW	14
	15	int ip6_route_me_harder(struct sk_buff *skb)
	16	{
	17	struct ipv6hdr *iph = skb->nh.ipv6h;
	18	struct dst_entry *dst;
	19	struct flowi fl = {
	20	.oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
	21	.nl_u =
	22	{ .ip6_u =
	23	{ .daddr = iph->daddr,
	24	.saddr = iph->saddr, } },
020b4c12 HW	25	};
	26
	27	dst = ip6_route_output(skb->sk, &fl);
	28
3e3850e9 PM	29	#ifdef CONFIG_XFRM
	30	if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
	31	xfrm_decode_session(skb, &fl, AF_INET6) == 0)
	32	if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
	33	return -1;
	34	#endif
	35
020b4c12 HW	36	if (dst->error) {
020b4c12 HW	37	IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
64ce2073	38	LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
020b4c12 HW	39	dst_release(dst);
	40	return -EINVAL;
	41	}
	42
	43	/* Drop old route. */
	44	dst_release(skb->dst);
	45
	46	skb->dst = dst;
	47	return 0;
	48	}
	49	EXPORT_SYMBOL(ip6_route_me_harder);
	50
2cc7d573 HW	51	/*
	52	* Extra routing may needed on local out, as the QUEUE target never
	53	* returns control to the table.
	54	*/
	55
	56	struct ip6_rt_info {
	57	struct in6_addr daddr;
	58	struct in6_addr saddr;
	59	};
	60
	61	static void save(const struct sk_buff skb, struct nf_info info)
	62	{
	63	struct ip6_rt_info *rt_info = nf_info_reroute(info);
	64
	65	if (info->hook == NF_IP6_LOCAL_OUT) {
	66	struct ipv6hdr *iph = skb->nh.ipv6h;
	67
	68	rt_info->daddr = iph->daddr;
	69	rt_info->saddr = iph->saddr;
	70	}
	71	}
	72
	73	static int reroute(struct sk_buff *pskb, const struct nf_info info)
	74	{
	75	struct ip6_rt_info *rt_info = nf_info_reroute(info);
	76
	77	if (info->hook == NF_IP6_LOCAL_OUT) {
	78	struct ipv6hdr iph = (pskb)->nh.ipv6h;
	79	if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) \|\|
	80	!ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
	81	return ip6_route_me_harder(*pskb);
	82	}
	83	return 0;
	84	}
	85
	86	static struct nf_queue_rerouter ip6_reroute = {
	87	.rer_size = sizeof(struct ip6_rt_info),
	88	.save = &save,
	89	.reroute = &reroute,
	90	};
	91
	92	int __init ipv6_netfilter_init(void)
	93	{
	94	return nf_register_queue_rerouter(PF_INET6, &ip6_reroute);
	95	}
	96
	97	void ipv6_netfilter_fini(void)
	98	{
	99	nf_unregister_queue_rerouter(PF_INET6);
	100	}
	101
	102	#else /* CONFIG_NETFILTER */
	103	int __init ipv6_netfilter_init(void)
	104	{
	105	return 0;
	106	}
	107
	108	void ipv6_netfilter_fini(void)
	109	{
	110	}
020b4c12	111	#endif /* CONFIG_NETFILTER */