[mirror_ubuntu-artful-kernel.git] / net / ipv6 / xfrm6_policy.c

/*
 * xfrm6_policy.c: based on xfrm4_policy.c
 *
 * Authors:
 *	Mitsuru KANDA @USAGI
 * 	Kazunori MIYAZAWA @USAGI
 * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 * 		IPv6 support
 * 	YOSHIFUJI Hideaki
 * 		Split up af-specific portion
 * 
 */

#include <linux/compiler.h>
#include <linux/config.h>
#include <linux/netdevice.h>
#include <net/addrconf.h>
#include <net/xfrm.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>

static struct dst_ops xfrm6_dst_ops;
static struct xfrm_policy_afinfo xfrm6_policy_afinfo;

static struct xfrm_type_map xfrm6_type_map = { .lock = RW_LOCK_UNLOCKED };

static int xfrm6_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
{
	int err = 0;
	*dst = (struct xfrm_dst*)ip6_route_output(NULL, fl);
	if (!*dst)
		err = -ENETUNREACH;
	return err;
}

static struct dst_entry *
__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
{
	struct dst_entry *dst;

	/* Still not clear if we should set fl->fl6_{src,dst}... */
	read_lock_bh(&policy->lock);
	for (dst = policy->bundles; dst; dst = dst->next) {
		struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
		struct in6_addr fl_dst_prefix, fl_src_prefix;

		ipv6_addr_prefix(&fl_dst_prefix,
				 &fl->fl6_dst,
				 xdst->u.rt6.rt6i_dst.plen);
		ipv6_addr_prefix(&fl_src_prefix,
				 &fl->fl6_src,
				 xdst->u.rt6.rt6i_src.plen);
		if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
		    ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
		    xfrm_bundle_ok(xdst, fl, AF_INET6)) {
			dst_clone(dst);
			break;
		}
	}
	read_unlock_bh(&policy->lock);
	return dst;
}

/* Allocate chain of dst_entry's, attach known xfrm's, calculate
 * all the metrics... Shortly, bundle a bundle.
 */

static int
__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
		      struct flowi *fl, struct dst_entry **dst_p)
{
	struct dst_entry *dst, *dst_prev;
	struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
	struct rt6_info *rt  = rt0;
	struct in6_addr *remote = &fl->fl6_dst;
	struct in6_addr *local  = &fl->fl6_src;
	struct flowi fl_tunnel = {
		.nl_u = {
			.ip6_u = {
				.saddr = *local,
				.daddr = *remote
			}
		}
	};
	int i;
	int err = 0;
	int header_len = 0;
	int trailer_len = 0;

	dst = dst_prev = NULL;
	dst_hold(&rt->u.dst);

	for (i = 0; i < nx; i++) {
		struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
		struct xfrm_dst *xdst;
		int tunnel = 0;

		if (unlikely(dst1 == NULL)) {
			err = -ENOBUFS;
			dst_release(&rt->u.dst);
			goto error;
		}

		if (!dst)
			dst = dst1;
		else {
			dst_prev->child = dst1;
			dst1->flags |= DST_NOHASH;
			dst_clone(dst1);
		}

		xdst = (struct xfrm_dst *)dst1;
		xdst->route = &rt->u.dst;
		if (rt->rt6i_node)
			xdst->route_cookie = rt->rt6i_node->fn_sernum;

		dst1->next = dst_prev;
		dst_prev = dst1;
		if (xfrm[i]->props.mode) {
			remote = (struct in6_addr*)&xfrm[i]->id.daddr;
			local  = (struct in6_addr*)&xfrm[i]->props.saddr;
			tunnel = 1;
		}
		header_len += xfrm[i]->props.header_len;
		trailer_len += xfrm[i]->props.trailer_len;

		if (tunnel) {
			ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
			ipv6_addr_copy(&fl_tunnel.fl6_src, local);
			err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
					      &fl_tunnel, AF_INET6);
			if (err)
				goto error;
		} else
			dst_hold(&rt->u.dst);
	}

	dst_prev->child = &rt->u.dst;
	dst->path = &rt->u.dst;
	if (rt->rt6i_node)
		((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;

	*dst_p = dst;
	dst = dst_prev;

	dst_prev = *dst_p;
	i = 0;
	for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
		struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;

		dst_prev->xfrm = xfrm[i++];
		dst_prev->dev = rt->u.dst.dev;
		if (rt->u.dst.dev)
			dev_hold(rt->u.dst.dev);
		dst_prev->obsolete	= -1;
		dst_prev->flags	       |= DST_HOST;
		dst_prev->lastuse	= jiffies;
		dst_prev->header_len	= header_len;
		dst_prev->trailer_len	= trailer_len;
		memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));

		/* Copy neighbour for reachability confirmation */
		dst_prev->neighbour	= neigh_clone(rt->u.dst.neighbour);
		dst_prev->input		= rt->u.dst.input;
		dst_prev->output	= xfrm6_output;
		/* Sheit... I remember I did this right. Apparently,
		 * it was magically lost, so this code needs audit */
		x->u.rt6.rt6i_flags    = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
		x->u.rt6.rt6i_metric   = rt0->rt6i_metric;
		x->u.rt6.rt6i_node     = rt0->rt6i_node;
		x->u.rt6.rt6i_gateway  = rt0->rt6i_gateway;
		memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway)); 
		x->u.rt6.rt6i_dst      = rt0->rt6i_dst;
		x->u.rt6.rt6i_src      = rt0->rt6i_src;	
		x->u.rt6.rt6i_idev     = rt0->rt6i_idev;
		in6_dev_hold(rt0->rt6i_idev);
		header_len -= x->u.dst.xfrm->props.header_len;
		trailer_len -= x->u.dst.xfrm->props.trailer_len;
	}

	xfrm_init_pmtu(dst);
	return 0;

error:
	if (dst)
		dst_free(dst);
	return err;
}

static inline void
_decode_session6(struct sk_buff *skb, struct flowi *fl)
{
	u16 offset = sizeof(struct ipv6hdr);
	struct ipv6hdr *hdr = skb->nh.ipv6h;
	struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
	u8 nexthdr = skb->nh.ipv6h->nexthdr;

	memset(fl, 0, sizeof(struct flowi));
	ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
	ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);

	while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
		switch (nexthdr) {
		case NEXTHDR_ROUTING:
		case NEXTHDR_HOP:
		case NEXTHDR_DEST:
			offset += ipv6_optlen(exthdr);
			nexthdr = exthdr->nexthdr;
			exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
			break;

		case IPPROTO_UDP:
		case IPPROTO_TCP:
		case IPPROTO_SCTP:
		case IPPROTO_DCCP:
			if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
				u16 *ports = (u16 *)exthdr;

				fl->fl_ip_sport = ports[0];
				fl->fl_ip_dport = ports[1];
			}
			fl->proto = nexthdr;
			return;

		case IPPROTO_ICMPV6:
			if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) {
				u8 *icmp = (u8 *)exthdr;

				fl->fl_icmp_type = icmp[0];
				fl->fl_icmp_code = icmp[1];
			}
			fl->proto = nexthdr;
			return;

		/* XXX Why are there these headers? */
		case IPPROTO_AH:
		case IPPROTO_ESP:
		case IPPROTO_COMP:
		default:
			fl->fl_ipsec_spi = 0;
			fl->proto = nexthdr;
			return;
		};
	}
}

static inline int xfrm6_garbage_collect(void)
{
	read_lock(&xfrm6_policy_afinfo.lock);
	xfrm6_policy_afinfo.garbage_collect();
	read_unlock(&xfrm6_policy_afinfo.lock);
	return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
}

static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
{
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
	struct dst_entry *path = xdst->route;

	path->ops->update_pmtu(path, mtu);
}

static void xfrm6_dst_destroy(struct dst_entry *dst)
{
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;

	if (likely(xdst->u.rt6.rt6i_idev))
		in6_dev_put(xdst->u.rt6.rt6i_idev);
	xfrm_dst_destroy(xdst);
}

static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
			     int unregister)
{
	struct xfrm_dst *xdst;

	if (!unregister)
		return;

	xdst = (struct xfrm_dst *)dst;
	if (xdst->u.rt6.rt6i_idev->dev == dev) {
		struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
		BUG_ON(!loopback_idev);

		do {
			in6_dev_put(xdst->u.rt6.rt6i_idev);
			xdst->u.rt6.rt6i_idev = loopback_idev;
			in6_dev_hold(loopback_idev);
			xdst = (struct xfrm_dst *)xdst->u.dst.child;
		} while (xdst->u.dst.xfrm);

		__in6_dev_put(loopback_idev);
	}

	xfrm_dst_ifdown(dst, dev);
}

static struct dst_ops xfrm6_dst_ops = {
	.family =		AF_INET6,
	.protocol =		__constant_htons(ETH_P_IPV6),
	.gc =			xfrm6_garbage_collect,
	.update_pmtu =		xfrm6_update_pmtu,
	.destroy =		xfrm6_dst_destroy,
	.ifdown =		xfrm6_dst_ifdown,
	.gc_thresh =		1024,
	.entry_size =		sizeof(struct xfrm_dst),
};

static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	.family =		AF_INET6,
	.lock = 		RW_LOCK_UNLOCKED,
	.type_map = 		&xfrm6_type_map,
	.dst_ops =		&xfrm6_dst_ops,
	.dst_lookup =		xfrm6_dst_lookup,
	.find_bundle =		__xfrm6_find_bundle,
	.bundle_create =	__xfrm6_bundle_create,
	.decode_session =	_decode_session6,
};

static void __init xfrm6_policy_init(void)
{
	xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
}

static void xfrm6_policy_fini(void)
{
	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
}

void __init xfrm6_init(void)
{
	xfrm6_policy_init();
	xfrm6_state_init();
}

void xfrm6_fini(void)
{
	//xfrm6_input_fini();
	xfrm6_policy_fini();
	xfrm6_state_fini();
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* xfrm6_policy.c: based on xfrm4_policy.c
	3	*
	4	* Authors:
	5	* Mitsuru KANDA @USAGI
	6	* Kazunori MIYAZAWA @USAGI
	7	* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
	8	* IPv6 support
	9	* YOSHIFUJI Hideaki
	10	* Split up af-specific portion
	11	*
	12	*/
	13
aabc9761	14	#include <linux/compiler.h>
1da177e4	15	#include <linux/config.h>
aabc9761 HX	16	#include <linux/netdevice.h>
aabc9761 HX	17	#include <net/addrconf.h>
1da177e4 LT	18	#include <net/xfrm.h>
	19	#include <net/ip.h>
	20	#include <net/ipv6.h>
	21	#include <net/ip6_route.h>
	22
	23	static struct dst_ops xfrm6_dst_ops;
	24	static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
	25
	26	static struct xfrm_type_map xfrm6_type_map = { .lock = RW_LOCK_UNLOCKED };
	27
	28	static int xfrm6_dst_lookup(struct xfrm_dst *dst, struct flowi fl)
	29	{
	30	int err = 0;
	31	dst = (struct xfrm_dst)ip6_route_output(NULL, fl);
	32	if (!*dst)
	33	err = -ENETUNREACH;
	34	return err;
	35	}
	36
	37	static struct dst_entry *
	38	__xfrm6_find_bundle(struct flowi fl, struct xfrm_policy policy)
	39	{
	40	struct dst_entry *dst;
	41
	42	/* Still not clear if we should set fl->fl6_{src,dst}... */
	43	read_lock_bh(&policy->lock);
	44	for (dst = policy->bundles; dst; dst = dst->next) {
	45	struct xfrm_dst xdst = (struct xfrm_dst)dst;
	46	struct in6_addr fl_dst_prefix, fl_src_prefix;
	47
	48	ipv6_addr_prefix(&fl_dst_prefix,
	49	&fl->fl6_dst,
	50	xdst->u.rt6.rt6i_dst.plen);
	51	ipv6_addr_prefix(&fl_src_prefix,
	52	&fl->fl6_src,
	53	xdst->u.rt6.rt6i_src.plen);
	54	if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
	55	ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
	56	xfrm_bundle_ok(xdst, fl, AF_INET6)) {
	57	dst_clone(dst);
	58	break;
	59	}
	60	}
	61	read_unlock_bh(&policy->lock);
	62	return dst;
	63	}
	64
	65	/* Allocate chain of dst_entry's, attach known xfrm's, calculate
	66	* all the metrics... Shortly, bundle a bundle.
	67	*/
	68
	69	static int
	70	__xfrm6_bundle_create(struct xfrm_policy policy, struct xfrm_state *xfrm, int nx,
	71	struct flowi fl, struct dst_entry *dst_p)
	72	{
	73	struct dst_entry dst, dst_prev;
	74	struct rt6_info rt0 = (struct rt6_info)(*dst_p);
	75	struct rt6_info *rt = rt0;
	76	struct in6_addr *remote = &fl->fl6_dst;
	77	struct in6_addr *local = &fl->fl6_src;
	78	struct flowi fl_tunnel = {
	79	.nl_u = {
	80	.ip6_u = {
	81	.saddr = *local,
82	.daddr = *remote
83	}
84	}
85	};
86	int i;
87	int err = 0;
88	int header_len = 0;
89	int trailer_len = 0;
90
91	dst = dst_prev = NULL;
92	dst_hold(&rt->u.dst);
93
94	for (i = 0; i < nx; i++) {
95	struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
96	struct xfrm_dst *xdst;
97	int tunnel = 0;
98
99	if (unlikely(dst1 == NULL)) {
100	err = -ENOBUFS;
101	dst_release(&rt->u.dst);
102	goto error;
103	}
104
105	if (!dst)
106	dst = dst1;
107	else {
108	dst_prev->child = dst1;
109	dst1->flags \|= DST_NOHASH;
110	dst_clone(dst1);
111	}
112
113	xdst = (struct xfrm_dst *)dst1;
114	xdst->route = &rt->u.dst;
92d63dec HY	115	if (rt->rt6i_node)
92d63dec HY	116	xdst->route_cookie = rt->rt6i_node->fn_sernum;
1da177e4 LT	117
	118	dst1->next = dst_prev;
	119	dst_prev = dst1;
	120	if (xfrm[i]->props.mode) {
	121	remote = (struct in6_addr*)&xfrm[i]->id.daddr;
	122	local = (struct in6_addr*)&xfrm[i]->props.saddr;
	123	tunnel = 1;
	124	}
	125	header_len += xfrm[i]->props.header_len;
	126	trailer_len += xfrm[i]->props.trailer_len;
	127
	128	if (tunnel) {
	129	ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
	130	ipv6_addr_copy(&fl_tunnel.fl6_src, local);
	131	err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
	132	&fl_tunnel, AF_INET6);
	133	if (err)
	134	goto error;
	135	} else
	136	dst_hold(&rt->u.dst);
	137	}
	138
	139	dst_prev->child = &rt->u.dst;
	140	dst->path = &rt->u.dst;
92d63dec HY	141	if (rt->rt6i_node)
92d63dec HY	142	((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
1da177e4 LT	143
	144	*dst_p = dst;
	145	dst = dst_prev;
	146
	147	dst_prev = *dst_p;
	148	i = 0;
	149	for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
	150	struct xfrm_dst x = (struct xfrm_dst)dst_prev;
	151
	152	dst_prev->xfrm = xfrm[i++];
	153	dst_prev->dev = rt->u.dst.dev;
	154	if (rt->u.dst.dev)
	155	dev_hold(rt->u.dst.dev);
	156	dst_prev->obsolete = -1;
	157	dst_prev->flags \|= DST_HOST;
	158	dst_prev->lastuse = jiffies;
	159	dst_prev->header_len = header_len;
	160	dst_prev->trailer_len = trailer_len;
	161	memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
	162
	163	/* Copy neighbour for reachability confirmation */
	164	dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
	165	dst_prev->input = rt->u.dst.input;
	166	dst_prev->output = xfrm6_output;
	167	/* Sheit... I remember I did this right. Apparently,
	168	* it was magically lost, so this code needs audit */
	169	x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST\|RTCF_MULTICAST\|RTCF_LOCAL);
	170	x->u.rt6.rt6i_metric = rt0->rt6i_metric;
	171	x->u.rt6.rt6i_node = rt0->rt6i_node;
	172	x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
	173	memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
	174	x->u.rt6.rt6i_dst = rt0->rt6i_dst;
	175	x->u.rt6.rt6i_src = rt0->rt6i_src;
aabc9761 HX	176	x->u.rt6.rt6i_idev = rt0->rt6i_idev;
aabc9761 HX	177	in6_dev_hold(rt0->rt6i_idev);
1da177e4 LT	178	header_len -= x->u.dst.xfrm->props.header_len;
	179	trailer_len -= x->u.dst.xfrm->props.trailer_len;
	180	}
	181
	182	xfrm_init_pmtu(dst);
	183	return 0;
	184
	185	error:
	186	if (dst)
	187	dst_free(dst);
	188	return err;
	189	}
	190
	191	static inline void
	192	_decode_session6(struct sk_buff skb, struct flowi fl)
	193	{
	194	u16 offset = sizeof(struct ipv6hdr);
	195	struct ipv6hdr *hdr = skb->nh.ipv6h;
	196	struct ipv6_opt_hdr exthdr = (struct ipv6_opt_hdr)(skb->nh.raw + offset);
	197	u8 nexthdr = skb->nh.ipv6h->nexthdr;
	198
	199	memset(fl, 0, sizeof(struct flowi));
	200	ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
	201	ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
	202
	203	while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
	204	switch (nexthdr) {
	205	case NEXTHDR_ROUTING:
	206	case NEXTHDR_HOP:
	207	case NEXTHDR_DEST:
	208	offset += ipv6_optlen(exthdr);
	209	nexthdr = exthdr->nexthdr;
	210	exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
	211	break;
	212
	213	case IPPROTO_UDP:
	214	case IPPROTO_TCP:
	215	case IPPROTO_SCTP:
9e999993	216	case IPPROTO_DCCP:
1da177e4 LT	217	if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
	218	u16 ports = (u16 )exthdr;
	219
	220	fl->fl_ip_sport = ports[0];
	221	fl->fl_ip_dport = ports[1];
	222	}
	223	fl->proto = nexthdr;
	224	return;
	225
	226	case IPPROTO_ICMPV6:
	227	if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) {
	228	u8 icmp = (u8 )exthdr;
	229
	230	fl->fl_icmp_type = icmp[0];
	231	fl->fl_icmp_code = icmp[1];
	232	}
	233	fl->proto = nexthdr;
	234	return;
	235
	236	/* XXX Why are there these headers? */
	237	case IPPROTO_AH:
	238	case IPPROTO_ESP:
	239	case IPPROTO_COMP:
	240	default:
	241	fl->fl_ipsec_spi = 0;
	242	fl->proto = nexthdr;
	243	return;
	244	};
	245	}
	246	}
	247
	248	static inline int xfrm6_garbage_collect(void)
	249	{
	250	read_lock(&xfrm6_policy_afinfo.lock);
	251	xfrm6_policy_afinfo.garbage_collect();
	252	read_unlock(&xfrm6_policy_afinfo.lock);
	253	return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
	254	}
	255
	256	static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
	257	{
	258	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	259	struct dst_entry *path = xdst->route;
	260
	261	path->ops->update_pmtu(path, mtu);
	262	}
	263
aabc9761 HX	264	static void xfrm6_dst_destroy(struct dst_entry *dst)
	265	{
	266	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	267
	268	if (likely(xdst->u.rt6.rt6i_idev))
	269	in6_dev_put(xdst->u.rt6.rt6i_idev);
	270	xfrm_dst_destroy(xdst);
	271	}
	272
	273	static void xfrm6_dst_ifdown(struct dst_entry dst, struct net_device dev,
	274	int unregister)
	275	{
	276	struct xfrm_dst *xdst;
	277
	278	if (!unregister)
	279	return;
	280
	281	xdst = (struct xfrm_dst *)dst;
	282	if (xdst->u.rt6.rt6i_idev->dev == dev) {
	283	struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
	284	BUG_ON(!loopback_idev);
	285
	286	do {
	287	in6_dev_put(xdst->u.rt6.rt6i_idev);
	288	xdst->u.rt6.rt6i_idev = loopback_idev;
	289	in6_dev_hold(loopback_idev);
	290	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	291	} while (xdst->u.dst.xfrm);
	292
	293	__in6_dev_put(loopback_idev);
	294	}
	295
	296	xfrm_dst_ifdown(dst, dev);
	297	}
	298
1da177e4 LT	299	static struct dst_ops xfrm6_dst_ops = {
	300	.family = AF_INET6,
	301	.protocol = __constant_htons(ETH_P_IPV6),
	302	.gc = xfrm6_garbage_collect,
	303	.update_pmtu = xfrm6_update_pmtu,
aabc9761 HX	304	.destroy = xfrm6_dst_destroy,
aabc9761 HX	305	.ifdown = xfrm6_dst_ifdown,
1da177e4 LT	306	.gc_thresh = 1024,
	307	.entry_size = sizeof(struct xfrm_dst),
	308	};
	309
	310	static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	311	.family = AF_INET6,
	312	.lock = RW_LOCK_UNLOCKED,
	313	.type_map = &xfrm6_type_map,
	314	.dst_ops = &xfrm6_dst_ops,
	315	.dst_lookup = xfrm6_dst_lookup,
	316	.find_bundle = __xfrm6_find_bundle,
	317	.bundle_create = __xfrm6_bundle_create,
	318	.decode_session = _decode_session6,
	319	};
	320
	321	static void __init xfrm6_policy_init(void)
	322	{
	323	xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
	324	}
	325
	326	static void xfrm6_policy_fini(void)
	327	{
	328	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
	329	}
	330
	331	void __init xfrm6_init(void)
	332	{
	333	xfrm6_policy_init();
	334	xfrm6_state_init();
	335	}
	336
	337	void xfrm6_fini(void)
	338	{
	339	//xfrm6_input_fini();
	340	xfrm6_policy_fini();
	341	xfrm6_state_fini();
	342	}