[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/err.h>
#include <linux/kernel.h>
#include <linux/inetdevice.h>
#include <net/dst.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 struct dst_entry *xfrm4_dst_lookup(int tos, xfrm_address_t *saddr,
					  xfrm_address_t *daddr)
{
	struct flowi fl = {
		.nl_u = {
			.ip4_u = {
				.tos = tos,
				.daddr = daddr->a4,
			},
		},
	};
	struct dst_entry *dst;
	struct rtable *rt;
	int err;

	if (saddr)
		fl.fl4_src = saddr->a4;

	err = __ip_route_output_key(&rt, &fl);
	dst = &rt->u.dst;
	if (err)
		dst = ERR_PTR(err);
	return dst;
}

static int xfrm4_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
{
	struct dst_entry *dst;
	struct rtable *rt;

	dst = xfrm4_dst_lookup(0, NULL, daddr);
	if (IS_ERR(dst))
		return -EHOSTUNREACH;

	rt = (struct rtable *)dst;
	saddr->a4 = rt->rt_src;
	dst_release(dst);
	return 0;
}

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;
	int 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) {
			dst1 = xfrm_dst_lookup(xfrm[i], tos);
			err = PTR_ERR(dst1);
			if (IS_ERR(dst1))
				goto error;

			rt = (struct rtable *)dst1;
		} 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;
	err = -ENODEV;
	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)
			goto error;
		dev_hold(rt->u.dst.dev);

		x->u.rt.idev = in_dev_get(rt->u.dst.dev);
		if (!x->u.rt.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;
		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;
		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
66cdb3ca HX	11	#include <linux/err.h>
66cdb3ca HX	12	#include <linux/kernel.h>
aabc9761	13	#include <linux/inetdevice.h>
45ff5a3f	14	#include <net/dst.h>
1da177e4 LT	15	#include <net/xfrm.h>
	16	#include <net/ip.h>
	17
	18	static struct dst_ops xfrm4_dst_ops;
	19	static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
	20
66cdb3ca HX	21	static struct dst_entry xfrm4_dst_lookup(int tos, xfrm_address_t saddr,
66cdb3ca HX	22	xfrm_address_t *daddr)
1da177e4	23	{
66cdb3ca	24	struct flowi fl = {
a1e59abf PM	25	.nl_u = {
a1e59abf PM	26	.ip4_u = {
66cdb3ca	27	.tos = tos,
a1e59abf PM	28	.daddr = daddr->a4,
	29	},
	30	},
	31	};
66cdb3ca HX	32	struct dst_entry *dst;
	33	struct rtable *rt;
	34	int err;
a1e59abf	35
66cdb3ca HX	36	if (saddr)
	37	fl.fl4_src = saddr->a4;
	38
	39	err = __ip_route_output_key(&rt, &fl);
	40	dst = &rt->u.dst;
	41	if (err)
	42	dst = ERR_PTR(err);
	43	return dst;
	44	}
	45
	46	static int xfrm4_get_saddr(xfrm_address_t saddr, xfrm_address_t daddr)
	47	{
	48	struct dst_entry *dst;
	49	struct rtable *rt;
	50
	51	dst = xfrm4_dst_lookup(0, NULL, daddr);
	52	if (IS_ERR(dst))
	53	return -EHOSTUNREACH;
	54
	55	rt = (struct rtable *)dst;
	56	saddr->a4 = rt->rt_src;
	57	dst_release(dst);
	58	return 0;
a1e59abf PM	59	}
a1e59abf PM	60
1da177e4 LT	61	static struct dst_entry *
	62	__xfrm4_find_bundle(struct flowi fl, struct xfrm_policy policy)
	63	{
	64	struct dst_entry *dst;
	65
	66	read_lock_bh(&policy->lock);
	67	for (dst = policy->bundles; dst; dst = dst->next) {
	68	struct xfrm_dst xdst = (struct xfrm_dst)dst;
	69	if (xdst->u.rt.fl.oif == fl->oif && /XXX/
	70	xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
e905a9ed YH	71	xdst->u.rt.fl.fl4_src == fl->fl4_src &&
e905a9ed YH	72	xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
5b368e61	73	xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
1da177e4 LT	74	dst_clone(dst);
	75	break;
	76	}
	77	}
	78	read_unlock_bh(&policy->lock);
	79	return dst;
	80	}
	81
	82	/* Allocate chain of dst_entry's, attach known xfrm's, calculate
	83	* all the metrics... Shortly, bundle a bundle.
	84	*/
	85
	86	static int
	87	__xfrm4_bundle_create(struct xfrm_policy policy, struct xfrm_state *xfrm, int nx,
	88	struct flowi fl, struct dst_entry *dst_p)
	89	{
	90	struct dst_entry dst, dst_prev;
	91	struct rtable rt0 = (struct rtable)(*dst_p);
	92	struct rtable *rt = rt0;
66cdb3ca	93	int tos = fl->fl4_tos;
1da177e4 LT	94	int i;
	95	int err;
	96	int header_len = 0;
	97	int trailer_len = 0;
	98
	99	dst = dst_prev = NULL;
	100	dst_hold(&rt->u.dst);
	101
	102	for (i = 0; i < nx; i++) {
	103	struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops);
	104	struct xfrm_dst *xdst;
1da177e4 LT	105
	106	if (unlikely(dst1 == NULL)) {
	107	err = -ENOBUFS;
	108	dst_release(&rt->u.dst);
	109	goto error;
	110	}
	111
	112	if (!dst)
	113	dst = dst1;
	114	else {
	115	dst_prev->child = dst1;
	116	dst1->flags \|= DST_NOHASH;
	117	dst_clone(dst1);
	118	}
	119
	120	xdst = (struct xfrm_dst *)dst1;
	121	xdst->route = &rt->u.dst;
9d4a706d	122	xdst->genid = xfrm[i]->genid;
1da177e4 LT	123
	124	dst1->next = dst_prev;
	125	dst_prev = dst1;
43372262	126
1da177e4 LT	127	header_len += xfrm[i]->props.header_len;
	128	trailer_len += xfrm[i]->props.trailer_len;
	129
1bfcb10f	130	if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
66cdb3ca HX	131	dst1 = xfrm_dst_lookup(xfrm[i], tos);
	132	err = PTR_ERR(dst1);
	133	if (IS_ERR(dst1))
1da177e4	134	goto error;
66cdb3ca HX	135
66cdb3ca HX	136	rt = (struct rtable *)dst1;
1da177e4 LT	137	} else
	138	dst_hold(&rt->u.dst);
	139	}
	140
	141	dst_prev->child = &rt->u.dst;
	142	dst->path = &rt->u.dst;
	143
8ce68ceb HX	144	/* Copy neighbout for reachability confirmation */
	145	dst->neighbour = neigh_clone(rt->u.dst.neighbour);
	146
1da177e4 LT	147	*dst_p = dst;
	148	dst = dst_prev;
	149
	150	dst_prev = *dst_p;
	151	i = 0;
fff69388	152	err = -ENODEV;
1da177e4 LT	153	for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
	154	struct xfrm_dst x = (struct xfrm_dst)dst_prev;
	155	x->u.rt.fl = *fl;
	156
	157	dst_prev->xfrm = xfrm[i++];
	158	dst_prev->dev = rt->u.dst.dev;
fff69388 HX	159	if (!rt->u.dst.dev)
	160	goto error;
	161	dev_hold(rt->u.dst.dev);
	162
	163	x->u.rt.idev = in_dev_get(rt->u.dst.dev);
	164	if (!x->u.rt.idev)
	165	goto error;
	166
1da177e4 LT	167	dst_prev->obsolete = -1;
	168	dst_prev->flags \|= DST_HOST;
	169	dst_prev->lastuse = jiffies;
	170	dst_prev->header_len = header_len;
	171	dst_prev->trailer_len = trailer_len;
	172	memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
	173
45ff5a3f	174	dst_prev->input = dst_discard;
13996378	175	dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
ed3e37dd HX	176	if (rt0->peer)
	177	atomic_inc(&rt0->peer->refcnt);
	178	x->u.rt.peer = rt0->peer;
1da177e4 LT	179	/* Sheit... I remember I did this right. Apparently,
	180	* it was magically lost, so this code needs audit */
	181	x->u.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST\|RTCF_MULTICAST\|RTCF_LOCAL);
ed3e37dd	182	x->u.rt.rt_type = rt0->rt_type;
1da177e4 LT	183	x->u.rt.rt_src = rt0->rt_src;
1da177e4 LT	184	x->u.rt.rt_dst = rt0->rt_dst;
ed3e37dd	185	x->u.rt.rt_gateway = rt0->rt_gateway;
1da177e4 LT	186	x->u.rt.rt_spec_dst = rt0->rt_spec_dst;
	187	header_len -= x->u.dst.xfrm->props.header_len;
	188	trailer_len -= x->u.dst.xfrm->props.trailer_len;
	189	}
	190
	191	xfrm_init_pmtu(dst);
	192	return 0;
	193
	194	error:
	195	if (dst)
	196	dst_free(dst);
	197	return err;
	198	}
	199
	200	static void
	201	_decode_session4(struct sk_buff skb, struct flowi fl)
	202	{
eddc9ec5	203	struct iphdr *iph = ip_hdr(skb);
d56f90a7	204	u8 xprth = skb_network_header(skb) + iph->ihl 4;
1da177e4 LT	205
	206	memset(fl, 0, sizeof(struct flowi));
	207	if (!(iph->frag_off & htons(IP_MF \| IP_OFFSET))) {
	208	switch (iph->protocol) {
	209	case IPPROTO_UDP:
ba4e58ec	210	case IPPROTO_UDPLITE:
1da177e4 LT	211	case IPPROTO_TCP:
1da177e4 LT	212	case IPPROTO_SCTP:
9e999993	213	case IPPROTO_DCCP:
1da177e4	214	if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
8c689a6e	215	__be16 ports = (__be16 )xprth;
1da177e4 LT	216
	217	fl->fl_ip_sport = ports[0];
	218	fl->fl_ip_dport = ports[1];
	219	}
	220	break;
	221
	222	case IPPROTO_ICMP:
	223	if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
	224	u8 *icmp = xprth;
	225
	226	fl->fl_icmp_type = icmp[0];
	227	fl->fl_icmp_code = icmp[1];
	228	}
	229	break;
	230
	231	case IPPROTO_ESP:
	232	if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
4324a174	233	__be32 ehdr = (__be32 )xprth;
1da177e4 LT	234
	235	fl->fl_ipsec_spi = ehdr[0];
	236	}
	237	break;
	238
	239	case IPPROTO_AH:
	240	if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
4324a174	241	__be32 ah_hdr = (__be32)xprth;
1da177e4 LT	242
	243	fl->fl_ipsec_spi = ah_hdr[1];
	244	}
	245	break;
	246
	247	case IPPROTO_COMP:
	248	if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
4324a174	249	__be16 ipcomp_hdr = (__be16 )xprth;
1da177e4	250
4195f814	251	fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
1da177e4 LT	252	}
	253	break;
	254	default:
	255	fl->fl_ipsec_spi = 0;
	256	break;
3ff50b79	257	}
1da177e4 LT	258	}
	259	fl->proto = iph->protocol;
	260	fl->fl4_dst = iph->daddr;
	261	fl->fl4_src = iph->saddr;
4da3089f	262	fl->fl4_tos = iph->tos;
1da177e4 LT	263	}
	264
	265	static inline int xfrm4_garbage_collect(void)
	266	{
1da177e4	267	xfrm4_policy_afinfo.garbage_collect();
1da177e4 LT	268	return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
	269	}
	270
	271	static void xfrm4_update_pmtu(struct dst_entry *dst, u32 mtu)
	272	{
	273	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	274	struct dst_entry *path = xdst->route;
	275
	276	path->ops->update_pmtu(path, mtu);
	277	}
	278
aabc9761 HX	279	static void xfrm4_dst_destroy(struct dst_entry *dst)
	280	{
	281	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	282
	283	if (likely(xdst->u.rt.idev))
	284	in_dev_put(xdst->u.rt.idev);
ed3e37dd	285	if (likely(xdst->u.rt.peer))
26db1677	286	inet_putpeer(xdst->u.rt.peer);
aabc9761 HX	287	xfrm_dst_destroy(xdst);
	288	}
	289
	290	static void xfrm4_dst_ifdown(struct dst_entry dst, struct net_device dev,
	291	int unregister)
	292	{
	293	struct xfrm_dst *xdst;
	294
	295	if (!unregister)
	296	return;
	297
	298	xdst = (struct xfrm_dst *)dst;
	299	if (xdst->u.rt.idev->dev == dev) {
2774c7ab	300	struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
aabc9761 HX	301	BUG_ON(!loopback_idev);
	302
	303	do {
	304	in_dev_put(xdst->u.rt.idev);
	305	xdst->u.rt.idev = loopback_idev;
	306	in_dev_hold(loopback_idev);
	307	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	308	} while (xdst->u.dst.xfrm);
	309
	310	__in_dev_put(loopback_idev);
	311	}
	312
	313	xfrm_dst_ifdown(dst, dev);
	314	}
	315
1da177e4 LT	316	static struct dst_ops xfrm4_dst_ops = {
	317	.family = AF_INET,
	318	.protocol = __constant_htons(ETH_P_IP),
	319	.gc = xfrm4_garbage_collect,
	320	.update_pmtu = xfrm4_update_pmtu,
aabc9761 HX	321	.destroy = xfrm4_dst_destroy,
aabc9761 HX	322	.ifdown = xfrm4_dst_ifdown,
1da177e4 LT	323	.gc_thresh = 1024,
	324	.entry_size = sizeof(struct xfrm_dst),
	325	};
	326
	327	static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
	328	.family = AF_INET,
1da177e4 LT	329	.dst_ops = &xfrm4_dst_ops,
1da177e4 LT	330	.dst_lookup = xfrm4_dst_lookup,
a1e59abf	331	.get_saddr = xfrm4_get_saddr,
1da177e4 LT	332	.find_bundle = __xfrm4_find_bundle,
	333	.bundle_create = __xfrm4_bundle_create,
	334	.decode_session = _decode_session4,
	335	};
	336
	337	static void __init xfrm4_policy_init(void)
	338	{
	339	xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
	340	}
	341
	342	static void __exit xfrm4_policy_fini(void)
	343	{
	344	xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
	345	}
	346
	347	void __init xfrm4_init(void)
	348	{
	349	xfrm4_state_init();
	350	xfrm4_policy_init();
	351	}
	352