[mirror_ubuntu-artful-kernel.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/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 struct in6_addr*
__xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr)
{
	return (x->type->remote_addr) ?
		(struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) :
		(struct in6_addr*)&x->id.daddr;
}

static inline struct in6_addr*
__xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
{
	return (x->type->local_addr) ?
		(struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) :
		(struct in6_addr*)&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 = 0;
	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, __xfrm6_bundle_addr_remote(xfrm[i], &fl->fl6_dst));

				ipv6_addr_copy(&fl_tunnel.fl6_src, __xfrm6_bundle_addr_local(xfrm[i], &fl->fl6_src));
				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;
	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)
			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;
		/* 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;
		x->u.rt6.rt6i_idev     = rt0->rt6i_idev;
		in6_dev_hold(rt0->rt6i_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 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>
1da177e4 LT	17	#include <net/xfrm.h>
	18	#include <net/ip.h>
	19	#include <net/ipv6.h>
	20	#include <net/ip6_route.h>
59fbb3a6	21	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
2ce4272a MN	22	#include <net/mip6.h>
2ce4272a MN	23	#endif
1da177e4 LT	24
	25	static struct dst_ops xfrm6_dst_ops;
	26	static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
	27
4251320f	28	static int xfrm6_dst_lookup(struct xfrm_dst *xdst, struct flowi fl)
1da177e4	29	{
4251320f VN	30	struct dst_entry *dst = ip6_route_output(NULL, fl);
	31	int err = dst->error;
	32	if (!err)
	33	xdst = (struct xfrm_dst ) dst;
	34	else
	35	dst_release(dst);
1da177e4 LT	36	return err;
	37	}
	38
a1e59abf PM	39	static int xfrm6_get_saddr(xfrm_address_t saddr, xfrm_address_t daddr)
	40	{
	41	struct rt6_info *rt;
	42	struct flowi fl_tunnel = {
	43	.nl_u = {
	44	.ip6_u = {
	45	.daddr = (struct in6_addr )&daddr->a6,
	46	},
	47	},
	48	};
	49
	50	if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
	51	ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
	52	(struct in6_addr *)&saddr->a6);
	53	dst_release(&rt->u.dst);
	54	return 0;
	55	}
	56	return -EHOSTUNREACH;
	57	}
	58
1da177e4 LT	59	static struct dst_entry *
	60	__xfrm6_find_bundle(struct flowi fl, struct xfrm_policy policy)
	61	{
	62	struct dst_entry *dst;
	63
	64	/* Still not clear if we should set fl->fl6_{src,dst}... */
	65	read_lock_bh(&policy->lock);
	66	for (dst = policy->bundles; dst; dst = dst->next) {
	67	struct xfrm_dst xdst = (struct xfrm_dst)dst;
	68	struct in6_addr fl_dst_prefix, fl_src_prefix;
	69
	70	ipv6_addr_prefix(&fl_dst_prefix,
	71	&fl->fl6_dst,
	72	xdst->u.rt6.rt6i_dst.plen);
	73	ipv6_addr_prefix(&fl_src_prefix,
	74	&fl->fl6_src,
	75	xdst->u.rt6.rt6i_src.plen);
	76	if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
	77	ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
5b368e61	78	xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
e53820de MN	79	(xdst->u.rt6.rt6i_dst.plen != 128 \|\|
e53820de MN	80	xdst->u.rt6.rt6i_src.plen != 128))) {
1da177e4 LT	81	dst_clone(dst);
	82	break;
	83	}
	84	}
	85	read_unlock_bh(&policy->lock);
	86	return dst;
	87	}
	88
99505a84 MN	89	static inline struct in6_addr*
	90	__xfrm6_bundle_addr_remote(struct xfrm_state x, struct in6_addr addr)
	91	{
	92	return (x->type->remote_addr) ?
	93	(struct in6_addr)x->type->remote_addr(x, (xfrm_address_t )addr) :
	94	(struct in6_addr*)&x->id.daddr;
	95	}
	96
	97	static inline struct in6_addr*
	98	__xfrm6_bundle_addr_local(struct xfrm_state x, struct in6_addr addr)
	99	{
	100	return (x->type->local_addr) ?
	101	(struct in6_addr)x->type->local_addr(x, (xfrm_address_t )addr) :
	102	(struct in6_addr*)&x->props.saddr;
	103	}
	104
1da177e4 LT	105	/* Allocate chain of dst_entry's, attach known xfrm's, calculate
	106	* all the metrics... Shortly, bundle a bundle.
	107	*/
	108
	109	static int
	110	__xfrm6_bundle_create(struct xfrm_policy policy, struct xfrm_state *xfrm, int nx,
	111	struct flowi fl, struct dst_entry *dst_p)
	112	{
	113	struct dst_entry dst, dst_prev;
	114	struct rt6_info rt0 = (struct rt6_info)(*dst_p);
	115	struct rt6_info *rt = rt0;
1da177e4 LT	116	struct flowi fl_tunnel = {
	117	.nl_u = {
	118	.ip6_u = {
c82f963e MK	119	.saddr = fl->fl6_src,
c82f963e MK	120	.daddr = fl->fl6_dst,
1da177e4 LT	121	}
	122	}
	123	};
	124	int i;
	125	int err = 0;
	126	int header_len = 0;
	127	int trailer_len = 0;
	128
	129	dst = dst_prev = NULL;
	130	dst_hold(&rt->u.dst);
	131
	132	for (i = 0; i < nx; i++) {
	133	struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
	134	struct xfrm_dst *xdst;
1da177e4 LT	135
	136	if (unlikely(dst1 == NULL)) {
	137	err = -ENOBUFS;
	138	dst_release(&rt->u.dst);
	139	goto error;
	140	}
	141
	142	if (!dst)
	143	dst = dst1;
	144	else {
	145	dst_prev->child = dst1;
	146	dst1->flags \|= DST_NOHASH;
	147	dst_clone(dst1);
	148	}
	149
	150	xdst = (struct xfrm_dst *)dst1;
	151	xdst->route = &rt->u.dst;
9d4a706d	152	xdst->genid = xfrm[i]->genid;
92d63dec HY	153	if (rt->rt6i_node)
92d63dec HY	154	xdst->route_cookie = rt->rt6i_node->fn_sernum;
1da177e4 LT	155
	156	dst1->next = dst_prev;
	157	dst_prev = dst1;
c82f963e	158
01488942	159	if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
b4ce9277 HX	160	((struct rt6_info *)dst)->nfheader_len +=
b4ce9277 HX	161	xfrm[i]->props.header_len;
01488942	162	header_len += xfrm[i]->props.header_len;
1da177e4 LT	163	trailer_len += xfrm[i]->props.trailer_len;
1da177e4 LT	164
1bfcb10f	165	if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
c82f963e MK	166	unsigned short encap_family = xfrm[i]->props.family;
	167	switch(encap_family) {
	168	case AF_INET:
	169	fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
	170	fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
	171	break;
	172	case AF_INET6:
bda390d5 MN	173	ipv6_addr_copy(&fl_tunnel.fl6_dst, __xfrm6_bundle_addr_remote(xfrm[i], &fl->fl6_dst));
bda390d5 MN	174
d3f23dfe	175	ipv6_addr_copy(&fl_tunnel.fl6_src, __xfrm6_bundle_addr_local(xfrm[i], &fl->fl6_src));
c82f963e MK	176	break;
	177	default:
	178	BUG_ON(1);
	179	}
	180
1da177e4	181	err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
c82f963e	182	&fl_tunnel, encap_family);
1da177e4 LT	183	if (err)
	184	goto error;
	185	} else
	186	dst_hold(&rt->u.dst);
	187	}
	188
	189	dst_prev->child = &rt->u.dst;
	190	dst->path = &rt->u.dst;
8ce68ceb HX	191
	192	/* Copy neighbour for reachability confirmation */
	193	dst->neighbour = neigh_clone(rt->u.dst.neighbour);
	194
92d63dec HY	195	if (rt->rt6i_node)
92d63dec HY	196	((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
1da177e4 LT	197
	198	*dst_p = dst;
	199	dst = dst_prev;
	200
	201	dst_prev = *dst_p;
	202	i = 0;
	203	for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
	204	struct xfrm_dst x = (struct xfrm_dst)dst_prev;
	205
	206	dst_prev->xfrm = xfrm[i++];
	207	dst_prev->dev = rt->u.dst.dev;
	208	if (rt->u.dst.dev)
	209	dev_hold(rt->u.dst.dev);
	210	dst_prev->obsolete = -1;
	211	dst_prev->flags \|= DST_HOST;
	212	dst_prev->lastuse = jiffies;
	213	dst_prev->header_len = header_len;
	214	dst_prev->trailer_len = trailer_len;
	215	memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
	216
1da177e4	217	dst_prev->input = rt->u.dst.input;
13996378	218	dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
1da177e4 LT	219	/* Sheit... I remember I did this right. Apparently,
1da177e4 LT	220	* it was magically lost, so this code needs audit */
1df2e445	221	x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTF_ANYCAST\|RTF_LOCAL);
1da177e4 LT	222	x->u.rt6.rt6i_metric = rt0->rt6i_metric;
	223	x->u.rt6.rt6i_node = rt0->rt6i_node;
	224	x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
1ab1457c	225	memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
1da177e4	226	x->u.rt6.rt6i_dst = rt0->rt6i_dst;
1ab1457c	227	x->u.rt6.rt6i_src = rt0->rt6i_src;
aabc9761 HX	228	x->u.rt6.rt6i_idev = rt0->rt6i_idev;
aabc9761 HX	229	in6_dev_hold(rt0->rt6i_idev);
01488942	230	header_len -= x->u.dst.xfrm->props.header_len;
1da177e4 LT	231	trailer_len -= x->u.dst.xfrm->props.trailer_len;
	232	}
	233
	234	xfrm_init_pmtu(dst);
	235	return 0;
	236
	237	error:
	238	if (dst)
	239	dst_free(dst);
	240	return err;
	241	}
	242
	243	static inline void
	244	_decode_session6(struct sk_buff skb, struct flowi fl)
	245	{
cfe1fc77	246	u16 offset = skb_network_header_len(skb);
0660e03f	247	struct ipv6hdr *hdr = ipv6_hdr(skb);
e3cae904	248	struct ipv6_opt_hdr *exthdr;
d56f90a7 ACM	249	const unsigned char *nh = skb_network_header(skb);
d56f90a7 ACM	250	u8 nexthdr = nh[IP6CB(skb)->nhoff];
1da177e4 LT	251
	252	memset(fl, 0, sizeof(struct flowi));
	253	ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
	254	ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
	255
d56f90a7 ACM	256	while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
	257	nh = skb_network_header(skb);
	258	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
e3cae904	259
1da177e4 LT	260	switch (nexthdr) {
	261	case NEXTHDR_ROUTING:
	262	case NEXTHDR_HOP:
	263	case NEXTHDR_DEST:
	264	offset += ipv6_optlen(exthdr);
	265	nexthdr = exthdr->nexthdr;
d56f90a7	266	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
1da177e4 LT	267	break;
	268
	269	case IPPROTO_UDP:
ba4e58ec	270	case IPPROTO_UDPLITE:
1da177e4 LT	271	case IPPROTO_TCP:
1da177e4 LT	272	case IPPROTO_SCTP:
9e999993	273	case IPPROTO_DCCP:
d56f90a7	274	if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
8c689a6e	275	__be16 ports = (__be16 )exthdr;
1da177e4 LT	276
	277	fl->fl_ip_sport = ports[0];
	278	fl->fl_ip_dport = ports[1];
	279	}
	280	fl->proto = nexthdr;
	281	return;
	282
	283	case IPPROTO_ICMPV6:
d56f90a7	284	if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
1da177e4 LT	285	u8 icmp = (u8 )exthdr;
	286
	287	fl->fl_icmp_type = icmp[0];
	288	fl->fl_icmp_code = icmp[1];
	289	}
	290	fl->proto = nexthdr;
	291	return;
	292
59fbb3a6	293	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
2ce4272a	294	case IPPROTO_MH:
d56f90a7	295	if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
2ce4272a MN	296	struct ip6_mh *mh;
	297	mh = (struct ip6_mh *)exthdr;
	298
	299	fl->fl_mh_type = mh->ip6mh_type;
	300	}
	301	fl->proto = nexthdr;
	302	return;
	303	#endif
	304
1da177e4 LT	305	/* XXX Why are there these headers? */
	306	case IPPROTO_AH:
	307	case IPPROTO_ESP:
	308	case IPPROTO_COMP:
	309	default:
	310	fl->fl_ipsec_spi = 0;
	311	fl->proto = nexthdr;
	312	return;
3ff50b79	313	}
1da177e4 LT	314	}
	315	}
	316
	317	static inline int xfrm6_garbage_collect(void)
	318	{
1da177e4	319	xfrm6_policy_afinfo.garbage_collect();
1da177e4 LT	320	return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
	321	}
	322
	323	static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
	324	{
	325	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	326	struct dst_entry *path = xdst->route;
	327
	328	path->ops->update_pmtu(path, mtu);
	329	}
	330
aabc9761 HX	331	static void xfrm6_dst_destroy(struct dst_entry *dst)
	332	{
	333	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	334
	335	if (likely(xdst->u.rt6.rt6i_idev))
	336	in6_dev_put(xdst->u.rt6.rt6i_idev);
	337	xfrm_dst_destroy(xdst);
	338	}
	339
	340	static void xfrm6_dst_ifdown(struct dst_entry dst, struct net_device dev,
	341	int unregister)
	342	{
	343	struct xfrm_dst *xdst;
	344
	345	if (!unregister)
	346	return;
	347
	348	xdst = (struct xfrm_dst *)dst;
	349	if (xdst->u.rt6.rt6i_idev->dev == dev) {
2774c7ab	350	struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
aabc9761 HX	351	BUG_ON(!loopback_idev);
	352
	353	do {
	354	in6_dev_put(xdst->u.rt6.rt6i_idev);
	355	xdst->u.rt6.rt6i_idev = loopback_idev;
	356	in6_dev_hold(loopback_idev);
	357	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	358	} while (xdst->u.dst.xfrm);
	359
	360	__in6_dev_put(loopback_idev);
	361	}
	362
	363	xfrm_dst_ifdown(dst, dev);
	364	}
	365
1da177e4 LT	366	static struct dst_ops xfrm6_dst_ops = {
	367	.family = AF_INET6,
	368	.protocol = __constant_htons(ETH_P_IPV6),
	369	.gc = xfrm6_garbage_collect,
	370	.update_pmtu = xfrm6_update_pmtu,
aabc9761 HX	371	.destroy = xfrm6_dst_destroy,
aabc9761 HX	372	.ifdown = xfrm6_dst_ifdown,
1da177e4 LT	373	.gc_thresh = 1024,
	374	.entry_size = sizeof(struct xfrm_dst),
	375	};
	376
	377	static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	378	.family = AF_INET6,
1da177e4 LT	379	.dst_ops = &xfrm6_dst_ops,
1da177e4 LT	380	.dst_lookup = xfrm6_dst_lookup,
a1e59abf	381	.get_saddr = xfrm6_get_saddr,
1da177e4 LT	382	.find_bundle = __xfrm6_find_bundle,
	383	.bundle_create = __xfrm6_bundle_create,
	384	.decode_session = _decode_session6,
	385	};
	386
	387	static void __init xfrm6_policy_init(void)
	388	{
	389	xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
	390	}
	391
	392	static void xfrm6_policy_fini(void)
	393	{
	394	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
	395	}
	396
	397	void __init xfrm6_init(void)
	398	{
	399	xfrm6_policy_init();
	400	xfrm6_state_init();
	401	}
	402
	403	void xfrm6_fini(void)
	404	{
	405	//xfrm6_input_fini();
	406	xfrm6_policy_fini();
	407	xfrm6_state_fini();
	408	}