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

#include <linux/kernel.h>
#include <linux/init.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 __exit ipv6_netfilter_fini(void)
{
	nf_unregister_queue_rerouter(PF_INET6);
}
Commit	Line	Data
020b4c12	1	#include <linux/kernel.h>
bb94aa16	2	#include <linux/init.h>
020b4c12	3	#include <linux/ipv6.h>
2cc7d573 HW	4	#include <linux/netfilter.h>
2cc7d573 HW	5	#include <linux/netfilter_ipv6.h>
020b4c12 HW	6	#include <net/dst.h>
	7	#include <net/ipv6.h>
	8	#include <net/ip6_route.h>
3e3850e9	9	#include <net/xfrm.h>
020b4c12 HW	10
	11	int ip6_route_me_harder(struct sk_buff *skb)
	12	{
	13	struct ipv6hdr *iph = skb->nh.ipv6h;
	14	struct dst_entry *dst;
	15	struct flowi fl = {
	16	.oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
	17	.nl_u =
	18	{ .ip6_u =
	19	{ .daddr = iph->daddr,
	20	.saddr = iph->saddr, } },
020b4c12 HW	21	};
	22
	23	dst = ip6_route_output(skb->sk, &fl);
	24
3e3850e9 PM	25	#ifdef CONFIG_XFRM
	26	if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
	27	xfrm_decode_session(skb, &fl, AF_INET6) == 0)
	28	if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
	29	return -1;
	30	#endif
	31
020b4c12 HW	32	if (dst->error) {
020b4c12 HW	33	IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
64ce2073	34	LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
020b4c12 HW	35	dst_release(dst);
	36	return -EINVAL;
	37	}
	38
	39	/* Drop old route. */
	40	dst_release(skb->dst);
	41
	42	skb->dst = dst;
	43	return 0;
	44	}
	45	EXPORT_SYMBOL(ip6_route_me_harder);
	46
2cc7d573 HW	47	/*
	48	* Extra routing may needed on local out, as the QUEUE target never
	49	* returns control to the table.
	50	*/
	51
	52	struct ip6_rt_info {
	53	struct in6_addr daddr;
	54	struct in6_addr saddr;
	55	};
	56
	57	static void save(const struct sk_buff skb, struct nf_info info)
	58	{
	59	struct ip6_rt_info *rt_info = nf_info_reroute(info);
	60
	61	if (info->hook == NF_IP6_LOCAL_OUT) {
	62	struct ipv6hdr *iph = skb->nh.ipv6h;
	63
	64	rt_info->daddr = iph->daddr;
	65	rt_info->saddr = iph->saddr;
	66	}
	67	}
	68
	69	static int reroute(struct sk_buff *pskb, const struct nf_info info)
	70	{
	71	struct ip6_rt_info *rt_info = nf_info_reroute(info);
	72
	73	if (info->hook == NF_IP6_LOCAL_OUT) {
	74	struct ipv6hdr iph = (pskb)->nh.ipv6h;
	75	if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) \|\|
	76	!ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
	77	return ip6_route_me_harder(*pskb);
	78	}
	79	return 0;
	80	}
	81
	82	static struct nf_queue_rerouter ip6_reroute = {
	83	.rer_size = sizeof(struct ip6_rt_info),
	84	.save = &save,
	85	.reroute = &reroute,
	86	};
	87
	88	int __init ipv6_netfilter_init(void)
	89	{
	90	return nf_register_queue_rerouter(PF_INET6, &ip6_reroute);
	91	}
	92
bb94aa16	93	void __exit ipv6_netfilter_fini(void)
2cc7d573 HW	94	{
	95	nf_unregister_queue_rerouter(PF_INET6);
	96	}