[deliverable/linux.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/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 int xfrm6_dst_lookup(struct xfrm_dst **xdst, struct flowi *fl)
{
	struct dst_entry *dst = ip6_route_output(NULL, fl);
	int err = dst->error;
	if (!err)
		*xdst = (struct xfrm_dst *) dst;
	else
		dst_release(dst);
	return err;
}

static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
{
	struct rt6_info *rt;
	struct flowi fl_tunnel = {
		.nl_u = {
			.ip6_u = {
				.daddr = *(struct in6_addr *)&daddr->a6,
			},
		},
	};

	if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
		ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
			       (struct in6_addr *)&saddr->a6);
		dst_release(&rt->u.dst);
		return 0;
	}
	return -EHOSTUNREACH;
}

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;
}

static inline xfrm_address_t *__xfrm6_bundle_addr_remote(struct xfrm_state *x)
{
	return (x->type->flags & XFRM_TYPE_REMOTE_COADDR) ? x->coaddr :
							    &x->id.daddr;
}

static inline xfrm_address_t *__xfrm6_bundle_addr_local(struct xfrm_state *x)
{
	return (x->type->flags & XFRM_TYPE_LOCAL_COADDR) ? x->coaddr :
							   &x->props.saddr;
}

/* 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 flowi fl_tunnel = {
		.nl_u = {
			.ip6_u = {
				.saddr = fl->fl6_src,
				.daddr = fl->fl6_dst,
			}
		}
	};
	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) {
			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;
			case AF_INET6:
				ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr *)__xfrm6_bundle_addr_remote(xfrm[i]));

				ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr *)__xfrm6_bundle_addr_local(xfrm[i]));
				break;
			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 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();
}
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
1ab1457c	11	*
1da177e4 LT	12	*/
1da177e4 LT	13
aabc9761	14	#include <linux/compiler.h>
aabc9761 HX	15	#include <linux/netdevice.h>
aabc9761 HX	16	#include <net/addrconf.h>
45ff5a3f	17	#include <net/dst.h>
1da177e4 LT	18	#include <net/xfrm.h>
	19	#include <net/ip.h>
	20	#include <net/ipv6.h>
	21	#include <net/ip6_route.h>
59fbb3a6	22	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
2ce4272a MN	23	#include <net/mip6.h>
2ce4272a MN	24	#endif
1da177e4 LT	25
	26	static struct dst_ops xfrm6_dst_ops;
	27	static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
	28
4251320f	29	static int xfrm6_dst_lookup(struct xfrm_dst *xdst, struct flowi fl)
1da177e4	30	{
4251320f VN	31	struct dst_entry *dst = ip6_route_output(NULL, fl);
	32	int err = dst->error;
	33	if (!err)
	34	xdst = (struct xfrm_dst ) dst;
	35	else
	36	dst_release(dst);
1da177e4 LT	37	return err;
	38	}
	39
a1e59abf PM	40	static int xfrm6_get_saddr(xfrm_address_t saddr, xfrm_address_t daddr)
	41	{
	42	struct rt6_info *rt;
	43	struct flowi fl_tunnel = {
	44	.nl_u = {
	45	.ip6_u = {
	46	.daddr = (struct in6_addr )&daddr->a6,
	47	},
	48	},
	49	};
	50
	51	if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
	52	ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
	53	(struct in6_addr *)&saddr->a6);
	54	dst_release(&rt->u.dst);
	55	return 0;
	56	}
	57	return -EHOSTUNREACH;
	58	}
	59
1da177e4 LT	60	static struct dst_entry *
	61	__xfrm6_find_bundle(struct flowi fl, struct xfrm_policy policy)
	62	{
	63	struct dst_entry *dst;
	64
	65	/* Still not clear if we should set fl->fl6_{src,dst}... */
	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	struct in6_addr fl_dst_prefix, fl_src_prefix;
	70
	71	ipv6_addr_prefix(&fl_dst_prefix,
	72	&fl->fl6_dst,
	73	xdst->u.rt6.rt6i_dst.plen);
	74	ipv6_addr_prefix(&fl_src_prefix,
	75	&fl->fl6_src,
	76	xdst->u.rt6.rt6i_src.plen);
	77	if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
	78	ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
5b368e61	79	xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
e53820de MN	80	(xdst->u.rt6.rt6i_dst.plen != 128 \|\|
e53820de MN	81	xdst->u.rt6.rt6i_src.plen != 128))) {
1da177e4 LT	82	dst_clone(dst);
	83	break;
	84	}
	85	}
	86	read_unlock_bh(&policy->lock);
	87	return dst;
	88	}
	89
f04e7e8d	90	static inline xfrm_address_t __xfrm6_bundle_addr_remote(struct xfrm_state x)
99505a84	91	{
f04e7e8d HX	92	return (x->type->flags & XFRM_TYPE_REMOTE_COADDR) ? x->coaddr :
f04e7e8d HX	93	&x->id.daddr;
99505a84 MN	94	}
99505a84 MN	95
f04e7e8d	96	static inline xfrm_address_t __xfrm6_bundle_addr_local(struct xfrm_state x)
99505a84	97	{
f04e7e8d HX	98	return (x->type->flags & XFRM_TYPE_LOCAL_COADDR) ? x->coaddr :
f04e7e8d HX	99	&x->props.saddr;
99505a84 MN	100	}
99505a84 MN	101
1da177e4 LT	102	/* Allocate chain of dst_entry's, attach known xfrm's, calculate
	103	* all the metrics... Shortly, bundle a bundle.
	104	*/
	105
	106	static int
	107	__xfrm6_bundle_create(struct xfrm_policy policy, struct xfrm_state *xfrm, int nx,
	108	struct flowi fl, struct dst_entry *dst_p)
	109	{
	110	struct dst_entry dst, dst_prev;
	111	struct rt6_info rt0 = (struct rt6_info)(*dst_p);
	112	struct rt6_info *rt = rt0;
1da177e4 LT	113	struct flowi fl_tunnel = {
	114	.nl_u = {
	115	.ip6_u = {
c82f963e MK	116	.saddr = fl->fl6_src,
c82f963e MK	117	.daddr = fl->fl6_dst,
1da177e4 LT	118	}
	119	}
	120	};
	121	int i;
fff69388	122	int err;
1da177e4 LT	123	int header_len = 0;
	124	int trailer_len = 0;
	125
	126	dst = dst_prev = NULL;
	127	dst_hold(&rt->u.dst);
	128
	129	for (i = 0; i < nx; i++) {
	130	struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
	131	struct xfrm_dst *xdst;
1da177e4 LT	132
	133	if (unlikely(dst1 == NULL)) {
	134	err = -ENOBUFS;
	135	dst_release(&rt->u.dst);
	136	goto error;
	137	}
	138
	139	if (!dst)
	140	dst = dst1;
	141	else {
	142	dst_prev->child = dst1;
	143	dst1->flags \|= DST_NOHASH;
	144	dst_clone(dst1);
	145	}
	146
	147	xdst = (struct xfrm_dst *)dst1;
	148	xdst->route = &rt->u.dst;
9d4a706d	149	xdst->genid = xfrm[i]->genid;
92d63dec HY	150	if (rt->rt6i_node)
92d63dec HY	151	xdst->route_cookie = rt->rt6i_node->fn_sernum;
1da177e4 LT	152
	153	dst1->next = dst_prev;
	154	dst_prev = dst1;
c82f963e	155
01488942	156	if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
b4ce9277 HX	157	((struct rt6_info *)dst)->nfheader_len +=
b4ce9277 HX	158	xfrm[i]->props.header_len;
01488942	159	header_len += xfrm[i]->props.header_len;
1da177e4 LT	160	trailer_len += xfrm[i]->props.trailer_len;
1da177e4 LT	161
1bfcb10f	162	if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
c82f963e MK	163	unsigned short encap_family = xfrm[i]->props.family;
	164	switch(encap_family) {
	165	case AF_INET:
	166	fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
	167	fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
	168	break;
	169	case AF_INET6:
f04e7e8d	170	ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr *)__xfrm6_bundle_addr_remote(xfrm[i]));
bda390d5	171
f04e7e8d	172	ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr *)__xfrm6_bundle_addr_local(xfrm[i]));
c82f963e MK	173	break;
	174	default:
	175	BUG_ON(1);
	176	}
	177
1da177e4	178	err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
c82f963e	179	&fl_tunnel, encap_family);
1da177e4 LT	180	if (err)
	181	goto error;
	182	} else
	183	dst_hold(&rt->u.dst);
	184	}
	185
	186	dst_prev->child = &rt->u.dst;
	187	dst->path = &rt->u.dst;
8ce68ceb HX	188
	189	/* Copy neighbour for reachability confirmation */
	190	dst->neighbour = neigh_clone(rt->u.dst.neighbour);
	191
92d63dec HY	192	if (rt->rt6i_node)
92d63dec HY	193	((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
1da177e4 LT	194
	195	*dst_p = dst;
	196	dst = dst_prev;
	197
	198	dst_prev = *dst_p;
	199	i = 0;
fff69388	200	err = -ENODEV;
1da177e4 LT	201	for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
	202	struct xfrm_dst x = (struct xfrm_dst)dst_prev;
	203
	204	dst_prev->xfrm = xfrm[i++];
	205	dst_prev->dev = rt->u.dst.dev;
fff69388 HX	206	if (!rt->u.dst.dev)
	207	goto error;
	208	dev_hold(rt->u.dst.dev);
	209
	210	x->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
	211	if (!x->u.rt6.rt6i_idev)
	212	goto error;
	213
1da177e4 LT	214	dst_prev->obsolete = -1;
	215	dst_prev->flags \|= DST_HOST;
	216	dst_prev->lastuse = jiffies;
	217	dst_prev->header_len = header_len;
	218	dst_prev->trailer_len = trailer_len;
	219	memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
	220
45ff5a3f	221	dst_prev->input = dst_discard;
13996378	222	dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
1da177e4 LT	223	/* Sheit... I remember I did this right. Apparently,
1da177e4 LT	224	* it was magically lost, so this code needs audit */
1df2e445	225	x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTF_ANYCAST\|RTF_LOCAL);
1da177e4 LT	226	x->u.rt6.rt6i_metric = rt0->rt6i_metric;
	227	x->u.rt6.rt6i_node = rt0->rt6i_node;
	228	x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
1ab1457c	229	memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
1da177e4	230	x->u.rt6.rt6i_dst = rt0->rt6i_dst;
1ab1457c	231	x->u.rt6.rt6i_src = rt0->rt6i_src;
01488942	232	header_len -= x->u.dst.xfrm->props.header_len;
1da177e4 LT	233	trailer_len -= x->u.dst.xfrm->props.trailer_len;
	234	}
	235
	236	xfrm_init_pmtu(dst);
	237	return 0;
	238
	239	error:
	240	if (dst)
	241	dst_free(dst);
	242	return err;
	243	}
	244
	245	static inline void
	246	_decode_session6(struct sk_buff skb, struct flowi fl)
	247	{
cfe1fc77	248	u16 offset = skb_network_header_len(skb);
0660e03f	249	struct ipv6hdr *hdr = ipv6_hdr(skb);
e3cae904	250	struct ipv6_opt_hdr *exthdr;
d56f90a7 ACM	251	const unsigned char *nh = skb_network_header(skb);
d56f90a7 ACM	252	u8 nexthdr = nh[IP6CB(skb)->nhoff];
1da177e4 LT	253
	254	memset(fl, 0, sizeof(struct flowi));
	255	ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
	256	ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
	257
d56f90a7 ACM	258	while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
	259	nh = skb_network_header(skb);
	260	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
e3cae904	261
1da177e4 LT	262	switch (nexthdr) {
	263	case NEXTHDR_ROUTING:
	264	case NEXTHDR_HOP:
	265	case NEXTHDR_DEST:
	266	offset += ipv6_optlen(exthdr);
	267	nexthdr = exthdr->nexthdr;
d56f90a7	268	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
1da177e4 LT	269	break;
	270
	271	case IPPROTO_UDP:
ba4e58ec	272	case IPPROTO_UDPLITE:
1da177e4 LT	273	case IPPROTO_TCP:
1da177e4 LT	274	case IPPROTO_SCTP:
9e999993	275	case IPPROTO_DCCP:
d56f90a7	276	if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
8c689a6e	277	__be16 ports = (__be16 )exthdr;
1da177e4 LT	278
	279	fl->fl_ip_sport = ports[0];
	280	fl->fl_ip_dport = ports[1];
	281	}
	282	fl->proto = nexthdr;
	283	return;
	284
	285	case IPPROTO_ICMPV6:
d56f90a7	286	if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
1da177e4 LT	287	u8 icmp = (u8 )exthdr;
	288
	289	fl->fl_icmp_type = icmp[0];
	290	fl->fl_icmp_code = icmp[1];
	291	}
	292	fl->proto = nexthdr;
	293	return;
	294
59fbb3a6	295	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
2ce4272a	296	case IPPROTO_MH:
d56f90a7	297	if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
2ce4272a MN	298	struct ip6_mh *mh;
	299	mh = (struct ip6_mh *)exthdr;
	300
	301	fl->fl_mh_type = mh->ip6mh_type;
	302	}
	303	fl->proto = nexthdr;
	304	return;
	305	#endif
	306
1da177e4 LT	307	/* XXX Why are there these headers? */
	308	case IPPROTO_AH:
	309	case IPPROTO_ESP:
	310	case IPPROTO_COMP:
	311	default:
	312	fl->fl_ipsec_spi = 0;
	313	fl->proto = nexthdr;
	314	return;
3ff50b79	315	}
1da177e4 LT	316	}
	317	}
	318
	319	static inline int xfrm6_garbage_collect(void)
	320	{
1da177e4	321	xfrm6_policy_afinfo.garbage_collect();
1da177e4 LT	322	return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
	323	}
	324
	325	static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
	326	{
	327	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	328	struct dst_entry *path = xdst->route;
	329
	330	path->ops->update_pmtu(path, mtu);
	331	}
	332
aabc9761 HX	333	static void xfrm6_dst_destroy(struct dst_entry *dst)
	334	{
	335	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	336
	337	if (likely(xdst->u.rt6.rt6i_idev))
	338	in6_dev_put(xdst->u.rt6.rt6i_idev);
	339	xfrm_dst_destroy(xdst);
	340	}
	341
	342	static void xfrm6_dst_ifdown(struct dst_entry dst, struct net_device dev,
	343	int unregister)
	344	{
	345	struct xfrm_dst *xdst;
	346
	347	if (!unregister)
	348	return;
	349
	350	xdst = (struct xfrm_dst *)dst;
	351	if (xdst->u.rt6.rt6i_idev->dev == dev) {
2774c7ab	352	struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
aabc9761 HX	353	BUG_ON(!loopback_idev);
	354
	355	do {
	356	in6_dev_put(xdst->u.rt6.rt6i_idev);
	357	xdst->u.rt6.rt6i_idev = loopback_idev;
	358	in6_dev_hold(loopback_idev);
	359	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	360	} while (xdst->u.dst.xfrm);
	361
	362	__in6_dev_put(loopback_idev);
	363	}
	364
	365	xfrm_dst_ifdown(dst, dev);
	366	}
	367
1da177e4 LT	368	static struct dst_ops xfrm6_dst_ops = {
	369	.family = AF_INET6,
	370	.protocol = __constant_htons(ETH_P_IPV6),
	371	.gc = xfrm6_garbage_collect,
	372	.update_pmtu = xfrm6_update_pmtu,
aabc9761 HX	373	.destroy = xfrm6_dst_destroy,
aabc9761 HX	374	.ifdown = xfrm6_dst_ifdown,
1da177e4 LT	375	.gc_thresh = 1024,
	376	.entry_size = sizeof(struct xfrm_dst),
	377	};
	378
	379	static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	380	.family = AF_INET6,
1da177e4 LT	381	.dst_ops = &xfrm6_dst_ops,
1da177e4 LT	382	.dst_lookup = xfrm6_dst_lookup,
a1e59abf	383	.get_saddr = xfrm6_get_saddr,
1da177e4 LT	384	.find_bundle = __xfrm6_find_bundle,
	385	.bundle_create = __xfrm6_bundle_create,
	386	.decode_session = _decode_session6,
	387	};
	388
	389	static void __init xfrm6_policy_init(void)
	390	{
	391	xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
	392	}
	393
	394	static void xfrm6_policy_fini(void)
	395	{
	396	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
	397	}
	398
	399	void __init xfrm6_init(void)
	400	{
	401	xfrm6_policy_init();
	402	xfrm6_state_init();
	403	}
	404
	405	void xfrm6_fini(void)
	406	{
	407	//xfrm6_input_fini();
	408	xfrm6_policy_fini();
	409	xfrm6_state_fini();
	410	}