[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>
#ifdef CONFIG_IPV6_MIP6
#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 **dst, struct flowi *fl)
{
	int err = 0;
	*dst = (struct xfrm_dst*)ip6_route_output(NULL, fl);
	if (!*dst)
		err = -ENETUNREACH;
	return err;
}

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(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;
}

static inline void
__xfrm6_bundle_len_inc(int *len, int *nflen, struct xfrm_state *x)
{
	if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
		*nflen += x->props.header_len;
	else
		*len += x->props.header_len;
}

static inline void
__xfrm6_bundle_len_dec(int *len, int *nflen, struct xfrm_state *x)
{
	if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
		*nflen -= x->props.header_len;
	else
		*len -= x->props.header_len;
}

/* 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 in6_addr *remote = &fl->fl6_dst;
	struct in6_addr *local  = &fl->fl6_src;
	struct flowi fl_tunnel = {
		.nl_u = {
			.ip6_u = {
				.saddr = *local,
				.daddr = *remote
			}
		}
	};
	int i;
	int err = 0;
	int header_len = 0;
	int nfheader_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;
		int tunnel = 0;

		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]->props.mode != XFRM_MODE_TRANSPORT) {
			remote = __xfrm6_bundle_addr_remote(xfrm[i], remote);
			local  = __xfrm6_bundle_addr_local(xfrm[i], local);
			tunnel = 1;
		}
		__xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
		trailer_len += xfrm[i]->props.trailer_len;

		if (tunnel) {
			ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
			ipv6_addr_copy(&fl_tunnel.fl6_src, local);
			err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
					      &fl_tunnel, AF_INET6);
			if (err)
				goto error;
		} else
			dst_hold(&rt->u.dst);
	}

	dst_prev->child = &rt->u.dst;
	dst->path = &rt->u.dst;
	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->nfheader_len	= nfheader_len;
		dst_prev->trailer_len	= trailer_len;
		memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));

		/* Copy neighbour for reachability confirmation */
		dst_prev->neighbour	= neigh_clone(rt->u.dst.neighbour);
		dst_prev->input		= rt->u.dst.input;
		dst_prev->output	= xfrm6_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&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_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);
		__xfrm6_bundle_len_dec(&header_len, &nfheader_len, x->u.dst.xfrm);
		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->h.raw - skb->nh.raw;
	struct ipv6hdr *hdr = skb->nh.ipv6h;
	struct ipv6_opt_hdr *exthdr;
	u8 nexthdr = skb->nh.raw[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, skb->nh.raw + offset + 1 - skb->data)) {
		exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);

		switch (nexthdr) {
		case NEXTHDR_ROUTING:
		case NEXTHDR_HOP:
		case NEXTHDR_DEST:
			offset += ipv6_optlen(exthdr);
			nexthdr = exthdr->nexthdr;
			exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
			break;

		case IPPROTO_UDP:
		case IPPROTO_TCP:
		case IPPROTO_SCTP:
		case IPPROTO_DCCP:
			if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
				u16 *ports = (u16 *)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, skb->nh.raw + offset + 2 - skb->data)) {
				u8 *icmp = (u8 *)exthdr;

				fl->fl_icmp_type = icmp[0];
				fl->fl_icmp_code = icmp[1];
			}
			fl->proto = nexthdr;
			return;

#ifdef CONFIG_IPV6_MIP6
		case IPPROTO_MH:
			if (pskb_may_pull(skb, skb->nh.raw + 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(&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,
	.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
	11	*
	12	*/
	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>
2ce4272a MN	21	#ifdef CONFIG_IPV6_MIP6
	22	#include <net/mip6.h>
	23	#endif
1da177e4 LT	24
	25	static struct dst_ops xfrm6_dst_ops;
	26	static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
	27
1da177e4 LT	28	static int xfrm6_dst_lookup(struct xfrm_dst *dst, struct flowi fl)
	29	{
	30	int err = 0;
	31	dst = (struct xfrm_dst)ip6_route_output(NULL, fl);
	32	if (!*dst)
	33	err = -ENETUNREACH;
	34	return err;
	35	}
	36
	37	static struct dst_entry *
	38	__xfrm6_find_bundle(struct flowi fl, struct xfrm_policy policy)
	39	{
	40	struct dst_entry *dst;
	41
	42	/* Still not clear if we should set fl->fl6_{src,dst}... */
	43	read_lock_bh(&policy->lock);
	44	for (dst = policy->bundles; dst; dst = dst->next) {
	45	struct xfrm_dst xdst = (struct xfrm_dst)dst;
	46	struct in6_addr fl_dst_prefix, fl_src_prefix;
	47
	48	ipv6_addr_prefix(&fl_dst_prefix,
	49	&fl->fl6_dst,
	50	xdst->u.rt6.rt6i_dst.plen);
	51	ipv6_addr_prefix(&fl_src_prefix,
	52	&fl->fl6_src,
	53	xdst->u.rt6.rt6i_src.plen);
	54	if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
	55	ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
e53820de MN	56	xfrm_bundle_ok(xdst, fl, AF_INET6,
	57	(xdst->u.rt6.rt6i_dst.plen != 128 \|\|
	58	xdst->u.rt6.rt6i_src.plen != 128))) {
1da177e4 LT	59	dst_clone(dst);
	60	break;
	61	}
	62	}
	63	read_unlock_bh(&policy->lock);
	64	return dst;
	65	}
	66
99505a84 MN	67	static inline struct in6_addr*
	68	__xfrm6_bundle_addr_remote(struct xfrm_state x, struct in6_addr addr)
	69	{
	70	return (x->type->remote_addr) ?
	71	(struct in6_addr)x->type->remote_addr(x, (xfrm_address_t )addr) :
	72	(struct in6_addr*)&x->id.daddr;
	73	}
	74
	75	static inline struct in6_addr*
	76	__xfrm6_bundle_addr_local(struct xfrm_state x, struct in6_addr addr)
	77	{
	78	return (x->type->local_addr) ?
	79	(struct in6_addr)x->type->local_addr(x, (xfrm_address_t )addr) :
	80	(struct in6_addr*)&x->props.saddr;
	81	}
	82
1b5c2299 MN	83	static inline void
	84	__xfrm6_bundle_len_inc(int len, int nflen, struct xfrm_state *x)
	85	{
	86	if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
	87	*nflen += x->props.header_len;
	88	else
	89	*len += x->props.header_len;
	90	}
	91
	92	static inline void
	93	__xfrm6_bundle_len_dec(int len, int nflen, struct xfrm_state *x)
	94	{
	95	if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
	96	*nflen -= x->props.header_len;
	97	else
	98	*len -= x->props.header_len;
	99	}
	100
1da177e4 LT	101	/* Allocate chain of dst_entry's, attach known xfrm's, calculate
	102	* all the metrics... Shortly, bundle a bundle.
	103	*/
	104
	105	static int
	106	__xfrm6_bundle_create(struct xfrm_policy policy, struct xfrm_state *xfrm, int nx,
	107	struct flowi fl, struct dst_entry *dst_p)
	108	{
	109	struct dst_entry dst, dst_prev;
	110	struct rt6_info rt0 = (struct rt6_info)(*dst_p);
	111	struct rt6_info *rt = rt0;
	112	struct in6_addr *remote = &fl->fl6_dst;
	113	struct in6_addr *local = &fl->fl6_src;
	114	struct flowi fl_tunnel = {
	115	.nl_u = {
	116	.ip6_u = {
	117	.saddr = *local,
	118	.daddr = *remote
	119	}
	120	}
	121	};
	122	int i;
	123	int err = 0;
	124	int header_len = 0;
1b5c2299	125	int nfheader_len = 0;
1da177e4 LT	126	int trailer_len = 0;
	127
	128	dst = dst_prev = NULL;
	129	dst_hold(&rt->u.dst);
	130
	131	for (i = 0; i < nx; i++) {
	132	struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
	133	struct xfrm_dst *xdst;
	134	int tunnel = 0;
	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;
7e49e6de	158	if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
99505a84 MN	159	remote = __xfrm6_bundle_addr_remote(xfrm[i], remote);
99505a84 MN	160	local = __xfrm6_bundle_addr_local(xfrm[i], local);
1da177e4 LT	161	tunnel = 1;
1da177e4 LT	162	}
1b5c2299	163	__xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
1da177e4 LT	164	trailer_len += xfrm[i]->props.trailer_len;
	165
	166	if (tunnel) {
	167	ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
	168	ipv6_addr_copy(&fl_tunnel.fl6_src, local);
	169	err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
	170	&fl_tunnel, AF_INET6);
	171	if (err)
	172	goto error;
	173	} else
	174	dst_hold(&rt->u.dst);
	175	}
	176
	177	dst_prev->child = &rt->u.dst;
	178	dst->path = &rt->u.dst;
92d63dec HY	179	if (rt->rt6i_node)
92d63dec HY	180	((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
1da177e4 LT	181
	182	*dst_p = dst;
	183	dst = dst_prev;
	184
	185	dst_prev = *dst_p;
	186	i = 0;
	187	for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
	188	struct xfrm_dst x = (struct xfrm_dst)dst_prev;
	189
	190	dst_prev->xfrm = xfrm[i++];
	191	dst_prev->dev = rt->u.dst.dev;
	192	if (rt->u.dst.dev)
	193	dev_hold(rt->u.dst.dev);
	194	dst_prev->obsolete = -1;
	195	dst_prev->flags \|= DST_HOST;
	196	dst_prev->lastuse = jiffies;
	197	dst_prev->header_len = header_len;
1b5c2299	198	dst_prev->nfheader_len = nfheader_len;
1da177e4 LT	199	dst_prev->trailer_len = trailer_len;
	200	memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
	201
	202	/* Copy neighbour for reachability confirmation */
	203	dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
	204	dst_prev->input = rt->u.dst.input;
	205	dst_prev->output = xfrm6_output;
	206	/* Sheit... I remember I did this right. Apparently,
	207	* it was magically lost, so this code needs audit */
	208	x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST\|RTCF_MULTICAST\|RTCF_LOCAL);
	209	x->u.rt6.rt6i_metric = rt0->rt6i_metric;
	210	x->u.rt6.rt6i_node = rt0->rt6i_node;
	211	x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
	212	memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
	213	x->u.rt6.rt6i_dst = rt0->rt6i_dst;
	214	x->u.rt6.rt6i_src = rt0->rt6i_src;
aabc9761 HX	215	x->u.rt6.rt6i_idev = rt0->rt6i_idev;
aabc9761 HX	216	in6_dev_hold(rt0->rt6i_idev);
1b5c2299	217	__xfrm6_bundle_len_dec(&header_len, &nfheader_len, x->u.dst.xfrm);
1da177e4 LT	218	trailer_len -= x->u.dst.xfrm->props.trailer_len;
	219	}
	220
	221	xfrm_init_pmtu(dst);
	222	return 0;
	223
	224	error:
	225	if (dst)
	226	dst_free(dst);
	227	return err;
	228	}
	229
	230	static inline void
	231	_decode_session6(struct sk_buff skb, struct flowi fl)
	232	{
e5d25a90	233	u16 offset = skb->h.raw - skb->nh.raw;
1da177e4	234	struct ipv6hdr *hdr = skb->nh.ipv6h;
e3cae904	235	struct ipv6_opt_hdr *exthdr;
e5d25a90	236	u8 nexthdr = skb->nh.raw[IP6CB(skb)->nhoff];
1da177e4 LT	237
	238	memset(fl, 0, sizeof(struct flowi));
	239	ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
	240	ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
	241
	242	while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
e3cae904 YH	243	exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
e3cae904 YH	244
1da177e4 LT	245	switch (nexthdr) {
	246	case NEXTHDR_ROUTING:
	247	case NEXTHDR_HOP:
	248	case NEXTHDR_DEST:
	249	offset += ipv6_optlen(exthdr);
	250	nexthdr = exthdr->nexthdr;
	251	exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
	252	break;
	253
	254	case IPPROTO_UDP:
	255	case IPPROTO_TCP:
	256	case IPPROTO_SCTP:
9e999993	257	case IPPROTO_DCCP:
1da177e4 LT	258	if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
	259	u16 ports = (u16 )exthdr;
	260
	261	fl->fl_ip_sport = ports[0];
	262	fl->fl_ip_dport = ports[1];
	263	}
	264	fl->proto = nexthdr;
	265	return;
	266
	267	case IPPROTO_ICMPV6:
	268	if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) {
	269	u8 icmp = (u8 )exthdr;
	270
	271	fl->fl_icmp_type = icmp[0];
	272	fl->fl_icmp_code = icmp[1];
	273	}
	274	fl->proto = nexthdr;
	275	return;
	276
2ce4272a MN	277	#ifdef CONFIG_IPV6_MIP6
	278	case IPPROTO_MH:
	279	if (pskb_may_pull(skb, skb->nh.raw + offset + 3 - skb->data)) {
	280	struct ip6_mh *mh;
	281	mh = (struct ip6_mh *)exthdr;
	282
	283	fl->fl_mh_type = mh->ip6mh_type;
	284	}
	285	fl->proto = nexthdr;
	286	return;
	287	#endif
	288
1da177e4 LT	289	/* XXX Why are there these headers? */
	290	case IPPROTO_AH:
	291	case IPPROTO_ESP:
	292	case IPPROTO_COMP:
	293	default:
	294	fl->fl_ipsec_spi = 0;
	295	fl->proto = nexthdr;
	296	return;
	297	};
	298	}
	299	}
	300
	301	static inline int xfrm6_garbage_collect(void)
	302	{
1da177e4	303	xfrm6_policy_afinfo.garbage_collect();
1da177e4 LT	304	return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
	305	}
	306
	307	static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
	308	{
	309	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	310	struct dst_entry *path = xdst->route;
	311
	312	path->ops->update_pmtu(path, mtu);
	313	}
	314
aabc9761 HX	315	static void xfrm6_dst_destroy(struct dst_entry *dst)
	316	{
	317	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	318
	319	if (likely(xdst->u.rt6.rt6i_idev))
	320	in6_dev_put(xdst->u.rt6.rt6i_idev);
	321	xfrm_dst_destroy(xdst);
	322	}
	323
	324	static void xfrm6_dst_ifdown(struct dst_entry dst, struct net_device dev,
	325	int unregister)
	326	{
	327	struct xfrm_dst *xdst;
	328
	329	if (!unregister)
	330	return;
	331
	332	xdst = (struct xfrm_dst *)dst;
	333	if (xdst->u.rt6.rt6i_idev->dev == dev) {
	334	struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
	335	BUG_ON(!loopback_idev);
	336
	337	do {
	338	in6_dev_put(xdst->u.rt6.rt6i_idev);
	339	xdst->u.rt6.rt6i_idev = loopback_idev;
	340	in6_dev_hold(loopback_idev);
	341	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	342	} while (xdst->u.dst.xfrm);
	343
	344	__in6_dev_put(loopback_idev);
	345	}
	346
	347	xfrm_dst_ifdown(dst, dev);
	348	}
	349
1da177e4 LT	350	static struct dst_ops xfrm6_dst_ops = {
	351	.family = AF_INET6,
	352	.protocol = __constant_htons(ETH_P_IPV6),
	353	.gc = xfrm6_garbage_collect,
	354	.update_pmtu = xfrm6_update_pmtu,
aabc9761 HX	355	.destroy = xfrm6_dst_destroy,
aabc9761 HX	356	.ifdown = xfrm6_dst_ifdown,
1da177e4 LT	357	.gc_thresh = 1024,
	358	.entry_size = sizeof(struct xfrm_dst),
	359	};
	360
	361	static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	362	.family = AF_INET6,
1da177e4 LT	363	.dst_ops = &xfrm6_dst_ops,
	364	.dst_lookup = xfrm6_dst_lookup,
	365	.find_bundle = __xfrm6_find_bundle,
	366	.bundle_create = __xfrm6_bundle_create,
	367	.decode_session = _decode_session6,
	368	};
	369
	370	static void __init xfrm6_policy_init(void)
	371	{
	372	xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
	373	}
	374
	375	static void xfrm6_policy_fini(void)
	376	{
	377	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
	378	}
	379
	380	void __init xfrm6_init(void)
	381	{
	382	xfrm6_policy_init();
	383	xfrm6_state_init();
	384	}
	385
	386	void xfrm6_fini(void)
	387	{
	388	//xfrm6_input_fini();
	389	xfrm6_policy_fini();
	390	xfrm6_state_fini();
	391	}