net/ipv6/xfrm6_policy.c - kernel/msm-4.19 - Gitiles

 /*
  * 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/err.h>
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <net/addrconf.h>
 #include <net/dst.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
 #include <net/ipv6.h>
 #include <net/ip6_route.h>
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 #include <net/mip6.h>
 #endif

 static struct dst_ops xfrm6_dst_ops;
 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;

 static struct dst_entry *xfrm6_dst_lookup(int tos, xfrm_address_t *saddr,
 					  xfrm_address_t *daddr)
 {
 	struct flowi fl = {};
 	struct dst_entry *dst;
 	int err;

 	memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
 	if (saddr)
 		memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));

 	dst = ip6_route_output(NULL, &fl);

 	err = dst->error;
 	if (dst->error) {
 		dst_release(dst);
 		dst = ERR_PTR(err);
 	}

 	return dst;
 }

 static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
 {
 	struct dst_entry *dst;

 	dst = xfrm6_dst_lookup(0, NULL, daddr);
 	if (IS_ERR(dst))
 		return -EHOSTUNREACH;

 	ipv6_get_saddr(dst, (struct in6_addr *)&daddr->a6,
 		       (struct in6_addr *)&saddr->a6);
 	dst_release(dst);
 	return 0;
 }

 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(policy, xdst, fl, AF_INET6,
 				   (xdst->u.rt6.rt6i_dst.plen != 128 ||
 				    xdst->u.rt6.rt6i_src.plen != 128))) {
 			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;
 	int i;
 	int err;
 	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;

 		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;
 		xdst->genid = xfrm[i]->genid;
 		if (rt->rt6i_node)
 			xdst->route_cookie = rt->rt6i_node->fn_sernum;

 		dst1->next = dst_prev;
 		dst_prev = dst1;

 		if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
 			((struct rt6_info *)dst)->nfheader_len +=
 				xfrm[i]->props.header_len;
 		header_len += xfrm[i]->props.header_len;
 		trailer_len += xfrm[i]->props.trailer_len;

 		if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
 			dst1 = xfrm_dst_lookup(xfrm[i], 0);
 			err = PTR_ERR(dst1);
 			if (IS_ERR(dst1))
 				goto error;

 			rt = (struct rt6_info *)dst1;
 		} else
 			dst_hold(&rt->u.dst);
 	}

 	dst_prev->child = &rt->u.dst;
 	dst->path = &rt->u.dst;

 	/* Copy neighbour for reachability confirmation */
 	dst->neighbour = neigh_clone(rt->u.dst.neighbour);

 	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;
 	err = -ENODEV;
 	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)
 			goto error;
 		dev_hold(rt->u.dst.dev);

 		x->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
 		if (!x->u.rt6.rt6i_idev)
 			goto error;

 		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));

 		dst_prev->input = dst_discard;
 		dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->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&(RTF_ANYCAST|RTF_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;
 		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 = skb_network_header_len(skb);
 	struct ipv6hdr *hdr = ipv6_hdr(skb);
 	struct ipv6_opt_hdr *exthdr;
 	const unsigned char *nh = skb_network_header(skb);
 	u8 nexthdr = nh[IP6CB(skb)->nhoff];

 	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, nh + offset + 1 - skb->data)) {
 		nh = skb_network_header(skb);
 		exthdr = (struct ipv6_opt_hdr *)(nh + offset);

 		switch (nexthdr) {
 		case NEXTHDR_ROUTING:
 		case NEXTHDR_HOP:
 		case NEXTHDR_DEST:
 			offset += ipv6_optlen(exthdr);
 			nexthdr = exthdr->nexthdr;
 			exthdr = (struct ipv6_opt_hdr *)(nh + offset);
 			break;

 		case IPPROTO_UDP:
 		case IPPROTO_UDPLITE:
 		case IPPROTO_TCP:
 		case IPPROTO_SCTP:
 		case IPPROTO_DCCP:
 			if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
 				__be16 *ports = (__be16 *)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, nh + offset + 2 - skb->data)) {
 				u8 *icmp = (u8 *)exthdr;

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

 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 		case IPPROTO_MH:
 			if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
 				struct ip6_mh *mh;
 				mh = (struct ip6_mh *)exthdr;

 				fl->fl_mh_type = mh->ip6mh_type;
 			}
 			fl->proto = nexthdr;
 			return;
 #endif

 		/* 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)
 {
 	xfrm6_policy_afinfo.garbage_collect();
 	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(init_net.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,
 	.dst_ops =		&xfrm6_dst_ops,
 	.dst_lookup =		xfrm6_dst_lookup,
 	.get_saddr = 		xfrm6_get_saddr,
 	.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();
 }
	/*
	* 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/err.h>
	#include <linux/kernel.h>
	#include <linux/netdevice.h>
	#include <net/addrconf.h>
	#include <net/dst.h>
	#include <net/xfrm.h>
	#include <net/ip.h>
	#include <net/ipv6.h>
	#include <net/ip6_route.h>
	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
	#include <net/mip6.h>
	#endif

	static struct dst_ops xfrm6_dst_ops;
	static struct xfrm_policy_afinfo xfrm6_policy_afinfo;

	static struct dst_entry xfrm6_dst_lookup(int tos, xfrm_address_t saddr,
	xfrm_address_t *daddr)
	{
	struct flowi fl = {};
	struct dst_entry *dst;
	int err;

	memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
	if (saddr)
	memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));

	dst = ip6_route_output(NULL, &fl);

	err = dst->error;
	if (dst->error) {
	dst_release(dst);
	dst = ERR_PTR(err);
	}

	return dst;
	}

	static int xfrm6_get_saddr(xfrm_address_t saddr, xfrm_address_t daddr)
	{
	struct dst_entry *dst;

	dst = xfrm6_dst_lookup(0, NULL, daddr);
	if (IS_ERR(dst))
	return -EHOSTUNREACH;

	ipv6_get_saddr(dst, (struct in6_addr *)&daddr->a6,
	(struct in6_addr *)&saddr->a6);
	dst_release(dst);
	return 0;
	}

	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(policy, xdst, fl, AF_INET6,
	(xdst->u.rt6.rt6i_dst.plen != 128 \|\|
	xdst->u.rt6.rt6i_src.plen != 128))) {
	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;
	int i;
	int err;
	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;

	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;
	xdst->genid = xfrm[i]->genid;
	if (rt->rt6i_node)
	xdst->route_cookie = rt->rt6i_node->fn_sernum;

	dst1->next = dst_prev;
	dst_prev = dst1;

	if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
	((struct rt6_info *)dst)->nfheader_len +=
	xfrm[i]->props.header_len;
	header_len += xfrm[i]->props.header_len;
	trailer_len += xfrm[i]->props.trailer_len;

	if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
	dst1 = xfrm_dst_lookup(xfrm[i], 0);
	err = PTR_ERR(dst1);
	if (IS_ERR(dst1))
	goto error;

	rt = (struct rt6_info *)dst1;
	} else
	dst_hold(&rt->u.dst);
	}

	dst_prev->child = &rt->u.dst;
	dst->path = &rt->u.dst;

	/* Copy neighbour for reachability confirmation */
	dst->neighbour = neigh_clone(rt->u.dst.neighbour);

	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;
	err = -ENODEV;
	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)
	goto error;
	dev_hold(rt->u.dst.dev);

	x->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
	if (!x->u.rt6.rt6i_idev)
	goto error;

	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));

	dst_prev->input = dst_discard;
	dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->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&(RTF_ANYCAST\|RTF_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;
	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 = skb_network_header_len(skb);
	struct ipv6hdr *hdr = ipv6_hdr(skb);
	struct ipv6_opt_hdr *exthdr;
	const unsigned char *nh = skb_network_header(skb);
	u8 nexthdr = nh[IP6CB(skb)->nhoff];

	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, nh + offset + 1 - skb->data)) {
	nh = skb_network_header(skb);
	exthdr = (struct ipv6_opt_hdr *)(nh + offset);

	switch (nexthdr) {
	case NEXTHDR_ROUTING:
	case NEXTHDR_HOP:
	case NEXTHDR_DEST:
	offset += ipv6_optlen(exthdr);
	nexthdr = exthdr->nexthdr;
	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
	break;

	case IPPROTO_UDP:
	case IPPROTO_UDPLITE:
	case IPPROTO_TCP:
	case IPPROTO_SCTP:
	case IPPROTO_DCCP:
	if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
	__be16 ports = (__be16 )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, nh + offset + 2 - skb->data)) {
	u8 icmp = (u8 )exthdr;

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

	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
	case IPPROTO_MH:
	if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
	struct ip6_mh *mh;
	mh = (struct ip6_mh *)exthdr;

	fl->fl_mh_type = mh->ip6mh_type;
	}
	fl->proto = nexthdr;
	return;
	#endif

	/* 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)
	{
	xfrm6_policy_afinfo.garbage_collect();
	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(init_net.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,
	.dst_ops = &xfrm6_dst_ops,
	.dst_lookup = xfrm6_dst_lookup,
	.get_saddr = xfrm6_get_saddr,
	.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();
	}