[net-next-2.6.git] / net / ipv4 / xfrm4_policy.c

/*
 * 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_TRANSPORT) {
			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;

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

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

		dst_prev->input		= rt->u.dst.input;
		dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
		if (rt0->peer)
			atomic_inc(&rt0->peer->refcnt);
		x->u.rt.peer = rt0->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 = rt0->rt_type;
		x->u.rt.rt_src = rt0->rt_src;
		x->u.rt.rt_dst = rt0->rt_dst;
		x->u.rt.rt_gateway = rt0->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 (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();
}
Commit	Line	Data
e905a9ed	1	/*
1da177e4 LT	2	* xfrm4_policy.c
	3	*
	4	* Changes:
	5	* Kazunori MIYAZAWA @USAGI
	6	* YOSHIFUJI Hideaki @USAGI
	7	* Split up af-specific portion
e905a9ed	8	*
1da177e4 LT	9	*/
1da177e4 LT	10
aabc9761	11	#include <linux/compiler.h>
aabc9761	12	#include <linux/inetdevice.h>
1da177e4 LT	13	#include <net/xfrm.h>
	14	#include <net/ip.h>
	15
	16	static struct dst_ops xfrm4_dst_ops;
	17	static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
	18
1da177e4 LT	19	static int xfrm4_dst_lookup(struct xfrm_dst *dst, struct flowi fl)
	20	{
	21	return __ip_route_output_key((struct rtable**)dst, fl);
	22	}
	23
a1e59abf PM	24	static int xfrm4_get_saddr(xfrm_address_t saddr, xfrm_address_t daddr)
	25	{
	26	struct rtable *rt;
	27	struct flowi fl_tunnel = {
	28	.nl_u = {
	29	.ip4_u = {
	30	.daddr = daddr->a4,
	31	},
	32	},
	33	};
	34
	35	if (!xfrm4_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
	36	saddr->a4 = rt->rt_src;
	37	dst_release(&rt->u.dst);
	38	return 0;
	39	}
	40	return -EHOSTUNREACH;
	41	}
	42
1da177e4 LT	43	static struct dst_entry *
	44	__xfrm4_find_bundle(struct flowi fl, struct xfrm_policy policy)
	45	{
	46	struct dst_entry *dst;
	47
	48	read_lock_bh(&policy->lock);
	49	for (dst = policy->bundles; dst; dst = dst->next) {
	50	struct xfrm_dst xdst = (struct xfrm_dst)dst;
	51	if (xdst->u.rt.fl.oif == fl->oif && /XXX/
	52	xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
e905a9ed YH	53	xdst->u.rt.fl.fl4_src == fl->fl4_src &&
e905a9ed YH	54	xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
5b368e61	55	xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
1da177e4 LT	56	dst_clone(dst);
	57	break;
	58	}
	59	}
	60	read_unlock_bh(&policy->lock);
	61	return dst;
	62	}
	63
	64	/* Allocate chain of dst_entry's, attach known xfrm's, calculate
	65	* all the metrics... Shortly, bundle a bundle.
	66	*/
	67
	68	static int
	69	__xfrm4_bundle_create(struct xfrm_policy policy, struct xfrm_state *xfrm, int nx,
	70	struct flowi fl, struct dst_entry *dst_p)
	71	{
	72	struct dst_entry dst, dst_prev;
	73	struct rtable rt0 = (struct rtable)(*dst_p);
	74	struct rtable *rt = rt0;
1da177e4 LT	75	struct flowi fl_tunnel = {
	76	.nl_u = {
	77	.ip4_u = {
43372262 MK	78	.saddr = fl->fl4_src,
43372262 MK	79	.daddr = fl->fl4_dst,
4da3089f	80	.tos = fl->fl4_tos
1da177e4 LT	81	}
	82	}
	83	};
	84	int i;
	85	int err;
	86	int header_len = 0;
	87	int trailer_len = 0;
	88
	89	dst = dst_prev = NULL;
	90	dst_hold(&rt->u.dst);
	91
	92	for (i = 0; i < nx; i++) {
	93	struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops);
	94	struct xfrm_dst *xdst;
1da177e4 LT	95
	96	if (unlikely(dst1 == NULL)) {
	97	err = -ENOBUFS;
	98	dst_release(&rt->u.dst);
	99	goto error;
	100	}
	101
	102	if (!dst)
	103	dst = dst1;
	104	else {
	105	dst_prev->child = dst1;
	106	dst1->flags \|= DST_NOHASH;
	107	dst_clone(dst1);
	108	}
	109
	110	xdst = (struct xfrm_dst *)dst1;
	111	xdst->route = &rt->u.dst;
9d4a706d	112	xdst->genid = xfrm[i]->genid;
1da177e4 LT	113
	114	dst1->next = dst_prev;
	115	dst_prev = dst1;
43372262	116
1da177e4 LT	117	header_len += xfrm[i]->props.header_len;
	118	trailer_len += xfrm[i]->props.trailer_len;
	119
1bfcb10f	120	if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
43372262	121	unsigned short encap_family = xfrm[i]->props.family;
132adf54	122	switch (encap_family) {
43372262 MK	123	case AF_INET:
	124	fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
	125	fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
	126	break;
	127	#if defined(CONFIG_IPV6) \|\| defined (CONFIG_IPV6_MODULE)
	128	case AF_INET6:
	129	ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr*)&xfrm[i]->id.daddr.a6);
	130	ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr*)&xfrm[i]->props.saddr.a6);
	131	break;
	132	#endif
	133	default:
	134	BUG_ON(1);
	135	}
1da177e4	136	err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
43372262	137	&fl_tunnel, encap_family);
1da177e4 LT	138	if (err)
	139	goto error;
	140	} else
	141	dst_hold(&rt->u.dst);
	142	}
	143
	144	dst_prev->child = &rt->u.dst;
	145	dst->path = &rt->u.dst;
	146
8ce68ceb HX	147	/* Copy neighbout for reachability confirmation */
	148	dst->neighbour = neigh_clone(rt->u.dst.neighbour);
	149
1da177e4 LT	150	*dst_p = dst;
	151	dst = dst_prev;
	152
	153	dst_prev = *dst_p;
	154	i = 0;
	155	for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
	156	struct xfrm_dst x = (struct xfrm_dst)dst_prev;
	157	x->u.rt.fl = *fl;
	158
	159	dst_prev->xfrm = xfrm[i++];
	160	dst_prev->dev = rt->u.dst.dev;
	161	if (rt->u.dst.dev)
	162	dev_hold(rt->u.dst.dev);
	163	dst_prev->obsolete = -1;
	164	dst_prev->flags \|= DST_HOST;
	165	dst_prev->lastuse = jiffies;
	166	dst_prev->header_len = header_len;
	167	dst_prev->trailer_len = trailer_len;
	168	memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
	169
1da177e4	170	dst_prev->input = rt->u.dst.input;
13996378	171	dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
ed3e37dd HX	172	if (rt0->peer)
	173	atomic_inc(&rt0->peer->refcnt);
	174	x->u.rt.peer = rt0->peer;
1da177e4 LT	175	/* Sheit... I remember I did this right. Apparently,
	176	* it was magically lost, so this code needs audit */
	177	x->u.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST\|RTCF_MULTICAST\|RTCF_LOCAL);
ed3e37dd	178	x->u.rt.rt_type = rt0->rt_type;
1da177e4 LT	179	x->u.rt.rt_src = rt0->rt_src;
1da177e4 LT	180	x->u.rt.rt_dst = rt0->rt_dst;
ed3e37dd	181	x->u.rt.rt_gateway = rt0->rt_gateway;
1da177e4	182	x->u.rt.rt_spec_dst = rt0->rt_spec_dst;
aabc9761 HX	183	x->u.rt.idev = rt0->idev;
aabc9761 HX	184	in_dev_hold(rt0->idev);
1da177e4 LT	185	header_len -= x->u.dst.xfrm->props.header_len;
	186	trailer_len -= x->u.dst.xfrm->props.trailer_len;
	187	}
	188
	189	xfrm_init_pmtu(dst);
	190	return 0;
	191
	192	error:
	193	if (dst)
	194	dst_free(dst);
	195	return err;
	196	}
	197
	198	static void
	199	_decode_session4(struct sk_buff skb, struct flowi fl)
	200	{
eddc9ec5	201	struct iphdr *iph = ip_hdr(skb);
d56f90a7	202	u8 xprth = skb_network_header(skb) + iph->ihl 4;
1da177e4 LT	203
	204	memset(fl, 0, sizeof(struct flowi));
	205	if (!(iph->frag_off & htons(IP_MF \| IP_OFFSET))) {
	206	switch (iph->protocol) {
	207	case IPPROTO_UDP:
ba4e58ec	208	case IPPROTO_UDPLITE:
1da177e4 LT	209	case IPPROTO_TCP:
1da177e4 LT	210	case IPPROTO_SCTP:
9e999993	211	case IPPROTO_DCCP:
1da177e4	212	if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
8c689a6e	213	__be16 ports = (__be16 )xprth;
1da177e4 LT	214
	215	fl->fl_ip_sport = ports[0];
	216	fl->fl_ip_dport = ports[1];
	217	}
	218	break;
	219
	220	case IPPROTO_ICMP:
	221	if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
	222	u8 *icmp = xprth;
	223
	224	fl->fl_icmp_type = icmp[0];
	225	fl->fl_icmp_code = icmp[1];
	226	}
	227	break;
	228
	229	case IPPROTO_ESP:
	230	if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
4324a174	231	__be32 ehdr = (__be32 )xprth;
1da177e4 LT	232
	233	fl->fl_ipsec_spi = ehdr[0];
	234	}
	235	break;
	236
	237	case IPPROTO_AH:
	238	if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
4324a174	239	__be32 ah_hdr = (__be32)xprth;
1da177e4 LT	240
	241	fl->fl_ipsec_spi = ah_hdr[1];
	242	}
	243	break;
	244
	245	case IPPROTO_COMP:
	246	if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
4324a174	247	__be16 ipcomp_hdr = (__be16 )xprth;
1da177e4	248
4195f814	249	fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
1da177e4 LT	250	}
	251	break;
	252	default:
	253	fl->fl_ipsec_spi = 0;
	254	break;
3ff50b79	255	}
1da177e4 LT	256	}
	257	fl->proto = iph->protocol;
	258	fl->fl4_dst = iph->daddr;
	259	fl->fl4_src = iph->saddr;
4da3089f	260	fl->fl4_tos = iph->tos;
1da177e4 LT	261	}
	262
	263	static inline int xfrm4_garbage_collect(void)
	264	{
1da177e4	265	xfrm4_policy_afinfo.garbage_collect();
1da177e4 LT	266	return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
	267	}
	268
	269	static void xfrm4_update_pmtu(struct dst_entry *dst, u32 mtu)
	270	{
	271	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	272	struct dst_entry *path = xdst->route;
	273
	274	path->ops->update_pmtu(path, mtu);
	275	}
	276
aabc9761 HX	277	static void xfrm4_dst_destroy(struct dst_entry *dst)
	278	{
	279	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	280
	281	if (likely(xdst->u.rt.idev))
	282	in_dev_put(xdst->u.rt.idev);
ed3e37dd	283	if (likely(xdst->u.rt.peer))
26db1677	284	inet_putpeer(xdst->u.rt.peer);
aabc9761 HX	285	xfrm_dst_destroy(xdst);
	286	}
	287
	288	static void xfrm4_dst_ifdown(struct dst_entry dst, struct net_device dev,
	289	int unregister)
	290	{
	291	struct xfrm_dst *xdst;
	292
	293	if (!unregister)
	294	return;
	295
	296	xdst = (struct xfrm_dst *)dst;
	297	if (xdst->u.rt.idev->dev == dev) {
2774c7ab	298	struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
aabc9761 HX	299	BUG_ON(!loopback_idev);
	300
	301	do {
	302	in_dev_put(xdst->u.rt.idev);
	303	xdst->u.rt.idev = loopback_idev;
	304	in_dev_hold(loopback_idev);
	305	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	306	} while (xdst->u.dst.xfrm);
	307
	308	__in_dev_put(loopback_idev);
	309	}
	310
	311	xfrm_dst_ifdown(dst, dev);
	312	}
	313
1da177e4 LT	314	static struct dst_ops xfrm4_dst_ops = {
	315	.family = AF_INET,
	316	.protocol = __constant_htons(ETH_P_IP),
	317	.gc = xfrm4_garbage_collect,
	318	.update_pmtu = xfrm4_update_pmtu,
aabc9761 HX	319	.destroy = xfrm4_dst_destroy,
aabc9761 HX	320	.ifdown = xfrm4_dst_ifdown,
1da177e4 LT	321	.gc_thresh = 1024,
	322	.entry_size = sizeof(struct xfrm_dst),
	323	};
	324
	325	static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
	326	.family = AF_INET,
1da177e4 LT	327	.dst_ops = &xfrm4_dst_ops,
1da177e4 LT	328	.dst_lookup = xfrm4_dst_lookup,
a1e59abf	329	.get_saddr = xfrm4_get_saddr,
1da177e4 LT	330	.find_bundle = __xfrm4_find_bundle,
	331	.bundle_create = __xfrm4_bundle_create,
	332	.decode_session = _decode_session4,
	333	};
	334
	335	static void __init xfrm4_policy_init(void)
	336	{
	337	xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
	338	}
	339
	340	static void __exit xfrm4_policy_fini(void)
	341	{
	342	xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
	343	}
	344
	345	void __init xfrm4_init(void)
	346	{
	347	xfrm4_state_init();
	348	xfrm4_policy_init();
	349	}
	350