net/ipv4/xfrm4_policy.c - kernel/msm-4.19 - Gitiles

 /*
  * xfrm4_policy.c
  *
  * Changes:
  *	Kazunori MIYAZAWA @USAGI
  * 	YOSHIFUJI Hideaki @USAGI
  *		Split up af-specific portion
  *
  */

 #include <linux/compiler.h>
 #include <linux/inetdevice.h>
 #include <net/xfrm.h>
 #include <net/ip.h>

 static struct dst_ops xfrm4_dst_ops;
 static struct xfrm_policy_afinfo xfrm4_policy_afinfo;

 static int xfrm4_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
 {
 	return __ip_route_output_key((struct rtable**)dst, fl);
 }

 static int xfrm4_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
 {
 	struct rtable *rt;
 	struct flowi fl_tunnel = {
 		.nl_u = {
 			.ip4_u = {
 				.daddr = daddr->a4,
 			},
 		},
 	};

 	if (!xfrm4_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
 		saddr->a4 = rt->rt_src;
 		dst_release(&rt->u.dst);
 		return 0;
 	}
 	return -EHOSTUNREACH;
 }

 static struct dst_entry *
 __xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
 {
 	struct dst_entry *dst;

 	read_lock_bh(&policy->lock);
 	for (dst = policy->bundles; dst; dst = dst->next) {
 		struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
 		if (xdst->u.rt.fl.oif == fl->oif &&	/*XXX*/
 		    xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
 		    xdst->u.rt.fl.fl4_src == fl->fl4_src &&
 		    xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
 		    xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
 			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
 __xfrm4_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 rtable *rt0 = (struct rtable*)(*dst_p);
 	struct rtable *rt = rt0;
 	struct flowi fl_tunnel = {
 		.nl_u = {
 			.ip4_u = {
 				.saddr = fl->fl4_src,
 				.daddr = fl->fl4_dst,
 				.tos = fl->fl4_tos
 			}
 		}
 	};
 	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(&xfrm4_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;

 		dst1->next = dst_prev;
 		dst_prev = dst1;

 		header_len += xfrm[i]->props.header_len;
 		trailer_len += xfrm[i]->props.trailer_len;

 		if (xfrm[i]->props.mode == XFRM_MODE_TUNNEL) {
 			unsigned short encap_family = xfrm[i]->props.family;
 			switch (encap_family) {
 			case AF_INET:
 				fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
 				fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
 				break;
 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 			case AF_INET6:
 				ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr*)&xfrm[i]->id.daddr.a6);
 				ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr*)&xfrm[i]->props.saddr.a6);
 				break;
 #endif
 			default:
 				BUG_ON(1);
 			}
 			err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
 					      &fl_tunnel, encap_family);
 			if (err)
 				goto error;
 		} else
 			dst_hold(&rt->u.dst);
 	}

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

 	*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;
 		struct xfrm_state_afinfo *afinfo;
 		x->u.rt.fl = *fl;

 		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->nfheader_len	= 0;
 		dst_prev->trailer_len	= trailer_len;
 		memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));

 		/* Copy neighbout for reachability confirmation */
 		dst_prev->neighbour	= neigh_clone(rt->u.dst.neighbour);
 		dst_prev->input		= rt->u.dst.input;
 		/* XXX: When IPv6 module can be unloaded, we should manage reference
 		 * to xfrm6_output in afinfo->output. Miyazawa
 		 * */
 		afinfo = xfrm_state_get_afinfo(dst_prev->xfrm->props.family);
 		if (!afinfo) {
 			dst = *dst_p;
 			err = -EAFNOSUPPORT;
 			goto error;
 		}
 		dst_prev->output = afinfo->output;
 		xfrm_state_put_afinfo(afinfo);
 		if (dst_prev->xfrm->props.family == AF_INET && rt->peer)
 			atomic_inc(&rt->peer->refcnt);
 		x->u.rt.peer = rt->peer;
 		/* Sheit... I remember I did this right. Apparently,
 		 * it was magically lost, so this code needs audit */
 		x->u.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
 		x->u.rt.rt_type = rt->rt_type;
 		x->u.rt.rt_src = rt0->rt_src;
 		x->u.rt.rt_dst = rt0->rt_dst;
 		x->u.rt.rt_gateway = rt->rt_gateway;
 		x->u.rt.rt_spec_dst = rt0->rt_spec_dst;
 		x->u.rt.idev = rt0->idev;
 		in_dev_hold(rt0->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 void
 _decode_session4(struct sk_buff *skb, struct flowi *fl)
 {
 	struct iphdr *iph = ip_hdr(skb);
 	u8 *xprth = skb_network_header(skb) + iph->ihl * 4;

 	memset(fl, 0, sizeof(struct flowi));
 	if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
 		switch (iph->protocol) {
 		case IPPROTO_UDP:
 		case IPPROTO_UDPLITE:
 		case IPPROTO_TCP:
 		case IPPROTO_SCTP:
 		case IPPROTO_DCCP:
 			if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
 				__be16 *ports = (__be16 *)xprth;

 				fl->fl_ip_sport = ports[0];
 				fl->fl_ip_dport = ports[1];
 			}
 			break;

 		case IPPROTO_ICMP:
 			if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
 				u8 *icmp = xprth;

 				fl->fl_icmp_type = icmp[0];
 				fl->fl_icmp_code = icmp[1];
 			}
 			break;

 		case IPPROTO_ESP:
 			if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
 				__be32 *ehdr = (__be32 *)xprth;

 				fl->fl_ipsec_spi = ehdr[0];
 			}
 			break;

 		case IPPROTO_AH:
 			if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
 				__be32 *ah_hdr = (__be32*)xprth;

 				fl->fl_ipsec_spi = ah_hdr[1];
 			}
 			break;

 		case IPPROTO_COMP:
 			if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
 				__be16 *ipcomp_hdr = (__be16 *)xprth;

 				fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
 			}
 			break;
 		default:
 			fl->fl_ipsec_spi = 0;
 			break;
 		}
 	}
 	fl->proto = iph->protocol;
 	fl->fl4_dst = iph->daddr;
 	fl->fl4_src = iph->saddr;
 	fl->fl4_tos = iph->tos;
 }

 static inline int xfrm4_garbage_collect(void)
 {
 	xfrm4_policy_afinfo.garbage_collect();
 	return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
 }

 static void xfrm4_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 xfrm4_dst_destroy(struct dst_entry *dst)
 {
 	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;

 	if (likely(xdst->u.rt.idev))
 		in_dev_put(xdst->u.rt.idev);
 	if (dst->xfrm && dst->xfrm->props.family == AF_INET && likely(xdst->u.rt.peer))
 		inet_putpeer(xdst->u.rt.peer);
 	xfrm_dst_destroy(xdst);
 }

 static void xfrm4_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.rt.idev->dev == dev) {
 		struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
 		BUG_ON(!loopback_idev);

 		do {
 			in_dev_put(xdst->u.rt.idev);
 			xdst->u.rt.idev = loopback_idev;
 			in_dev_hold(loopback_idev);
 			xdst = (struct xfrm_dst *)xdst->u.dst.child;
 		} while (xdst->u.dst.xfrm);

 		__in_dev_put(loopback_idev);
 	}

 	xfrm_dst_ifdown(dst, dev);
 }

 static struct dst_ops xfrm4_dst_ops = {
 	.family =		AF_INET,
 	.protocol =		__constant_htons(ETH_P_IP),
 	.gc =			xfrm4_garbage_collect,
 	.update_pmtu =		xfrm4_update_pmtu,
 	.destroy =		xfrm4_dst_destroy,
 	.ifdown =		xfrm4_dst_ifdown,
 	.gc_thresh =		1024,
 	.entry_size =		sizeof(struct xfrm_dst),
 };

 static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
 	.family = 		AF_INET,
 	.dst_ops =		&xfrm4_dst_ops,
 	.dst_lookup =		xfrm4_dst_lookup,
 	.get_saddr =		xfrm4_get_saddr,
 	.find_bundle = 		__xfrm4_find_bundle,
 	.bundle_create =	__xfrm4_bundle_create,
 	.decode_session =	_decode_session4,
 };

 static void __init xfrm4_policy_init(void)
 {
 	xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
 }

 static void __exit xfrm4_policy_fini(void)
 {
 	xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
 }

 void __init xfrm4_init(void)
 {
 	xfrm4_state_init();
 	xfrm4_policy_init();
 }
	/*
	* xfrm4_policy.c
	*
	* Changes:
	* Kazunori MIYAZAWA @USAGI
	* YOSHIFUJI Hideaki @USAGI
	* Split up af-specific portion
	*
	*/

	#include <linux/compiler.h>
	#include <linux/inetdevice.h>
	#include <net/xfrm.h>
	#include <net/ip.h>

	static struct dst_ops xfrm4_dst_ops;
	static struct xfrm_policy_afinfo xfrm4_policy_afinfo;

	static int xfrm4_dst_lookup(struct xfrm_dst *dst, struct flowi fl)
	{
	return __ip_route_output_key((struct rtable**)dst, fl);
	}

	static int xfrm4_get_saddr(xfrm_address_t saddr, xfrm_address_t daddr)
	{
	struct rtable *rt;
	struct flowi fl_tunnel = {
	.nl_u = {
	.ip4_u = {
	.daddr = daddr->a4,
	},
	},
	};

	if (!xfrm4_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
	saddr->a4 = rt->rt_src;
	dst_release(&rt->u.dst);
	return 0;
	}
	return -EHOSTUNREACH;
	}

	static struct dst_entry *
	__xfrm4_find_bundle(struct flowi fl, struct xfrm_policy policy)
	{
	struct dst_entry *dst;

	read_lock_bh(&policy->lock);
	for (dst = policy->bundles; dst; dst = dst->next) {
	struct xfrm_dst xdst = (struct xfrm_dst)dst;
	if (xdst->u.rt.fl.oif == fl->oif && /XXX/
	xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
	xdst->u.rt.fl.fl4_src == fl->fl4_src &&
	xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
	xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
	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
	__xfrm4_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 rtable rt0 = (struct rtable)(*dst_p);
	struct rtable *rt = rt0;
	struct flowi fl_tunnel = {
	.nl_u = {
	.ip4_u = {
	.saddr = fl->fl4_src,
	.daddr = fl->fl4_dst,
	.tos = fl->fl4_tos
	}
	}
	};
	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(&xfrm4_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;

	dst1->next = dst_prev;
	dst_prev = dst1;

	header_len += xfrm[i]->props.header_len;
	trailer_len += xfrm[i]->props.trailer_len;

	if (xfrm[i]->props.mode == XFRM_MODE_TUNNEL) {
	unsigned short encap_family = xfrm[i]->props.family;
	switch (encap_family) {
	case AF_INET:
	fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
	fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
	break;
	#if defined(CONFIG_IPV6) \|\| defined (CONFIG_IPV6_MODULE)
	case AF_INET6:
	ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr*)&xfrm[i]->id.daddr.a6);
	ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr*)&xfrm[i]->props.saddr.a6);
	break;
	#endif
	default:
	BUG_ON(1);
	}
	err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
	&fl_tunnel, encap_family);
	if (err)
	goto error;
	} else
	dst_hold(&rt->u.dst);
	}

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

	*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;
	struct xfrm_state_afinfo *afinfo;
	x->u.rt.fl = *fl;

	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->nfheader_len = 0;
	dst_prev->trailer_len = trailer_len;
	memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));

	/* Copy neighbout for reachability confirmation */
	dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
	dst_prev->input = rt->u.dst.input;
	/* XXX: When IPv6 module can be unloaded, we should manage reference
	* to xfrm6_output in afinfo->output. Miyazawa
	* */
	afinfo = xfrm_state_get_afinfo(dst_prev->xfrm->props.family);
	if (!afinfo) {
	dst = *dst_p;
	err = -EAFNOSUPPORT;
	goto error;
	}
	dst_prev->output = afinfo->output;
	xfrm_state_put_afinfo(afinfo);
	if (dst_prev->xfrm->props.family == AF_INET && rt->peer)
	atomic_inc(&rt->peer->refcnt);
	x->u.rt.peer = rt->peer;
	/* Sheit... I remember I did this right. Apparently,
	* it was magically lost, so this code needs audit */
	x->u.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST\|RTCF_MULTICAST\|RTCF_LOCAL);
	x->u.rt.rt_type = rt->rt_type;
	x->u.rt.rt_src = rt0->rt_src;
	x->u.rt.rt_dst = rt0->rt_dst;
	x->u.rt.rt_gateway = rt->rt_gateway;
	x->u.rt.rt_spec_dst = rt0->rt_spec_dst;
	x->u.rt.idev = rt0->idev;
	in_dev_hold(rt0->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 void
	_decode_session4(struct sk_buff skb, struct flowi fl)
	{
	struct iphdr *iph = ip_hdr(skb);
	u8 xprth = skb_network_header(skb) + iph->ihl 4;

	memset(fl, 0, sizeof(struct flowi));
	if (!(iph->frag_off & htons(IP_MF \| IP_OFFSET))) {
	switch (iph->protocol) {
	case IPPROTO_UDP:
	case IPPROTO_UDPLITE:
	case IPPROTO_TCP:
	case IPPROTO_SCTP:
	case IPPROTO_DCCP:
	if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
	__be16 ports = (__be16 )xprth;

	fl->fl_ip_sport = ports[0];
	fl->fl_ip_dport = ports[1];
	}
	break;

	case IPPROTO_ICMP:
	if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
	u8 *icmp = xprth;

	fl->fl_icmp_type = icmp[0];
	fl->fl_icmp_code = icmp[1];
	}
	break;

	case IPPROTO_ESP:
	if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
	__be32 ehdr = (__be32 )xprth;

	fl->fl_ipsec_spi = ehdr[0];
	}
	break;

	case IPPROTO_AH:
	if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
	__be32 ah_hdr = (__be32)xprth;

	fl->fl_ipsec_spi = ah_hdr[1];
	}
	break;

	case IPPROTO_COMP:
	if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
	__be16 ipcomp_hdr = (__be16 )xprth;

	fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
	}
	break;
	default:
	fl->fl_ipsec_spi = 0;
	break;
	}
	}
	fl->proto = iph->protocol;
	fl->fl4_dst = iph->daddr;
	fl->fl4_src = iph->saddr;
	fl->fl4_tos = iph->tos;
	}

	static inline int xfrm4_garbage_collect(void)
	{
	xfrm4_policy_afinfo.garbage_collect();
	return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
	}

	static void xfrm4_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 xfrm4_dst_destroy(struct dst_entry *dst)
	{
	struct xfrm_dst xdst = (struct xfrm_dst )dst;

	if (likely(xdst->u.rt.idev))
	in_dev_put(xdst->u.rt.idev);
	if (dst->xfrm && dst->xfrm->props.family == AF_INET && likely(xdst->u.rt.peer))
	inet_putpeer(xdst->u.rt.peer);
	xfrm_dst_destroy(xdst);
	}

	static void xfrm4_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.rt.idev->dev == dev) {
	struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
	BUG_ON(!loopback_idev);

	do {
	in_dev_put(xdst->u.rt.idev);
	xdst->u.rt.idev = loopback_idev;
	in_dev_hold(loopback_idev);
	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	} while (xdst->u.dst.xfrm);

	__in_dev_put(loopback_idev);
	}

	xfrm_dst_ifdown(dst, dev);
	}

	static struct dst_ops xfrm4_dst_ops = {
	.family = AF_INET,
	.protocol = __constant_htons(ETH_P_IP),
	.gc = xfrm4_garbage_collect,
	.update_pmtu = xfrm4_update_pmtu,
	.destroy = xfrm4_dst_destroy,
	.ifdown = xfrm4_dst_ifdown,
	.gc_thresh = 1024,
	.entry_size = sizeof(struct xfrm_dst),
	};

	static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
	.family = AF_INET,
	.dst_ops = &xfrm4_dst_ops,
	.dst_lookup = xfrm4_dst_lookup,
	.get_saddr = xfrm4_get_saddr,
	.find_bundle = __xfrm4_find_bundle,
	.bundle_create = __xfrm4_bundle_create,
	.decode_session = _decode_session4,
	};

	static void __init xfrm4_policy_init(void)
	{
	xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
	}

	static void __exit xfrm4_policy_fini(void)
	{
	xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
	}

	void __init xfrm4_init(void)
	{
	xfrm4_state_init();
	xfrm4_policy_init();
	}