[linux.git] / net / ipv6 / xfrm6_policy.c

/*
 * xfrm6_policy.c: based on xfrm4_policy.c
 *
 * Authors:
 *	Mitsuru KANDA @USAGI
 * 	Kazunori MIYAZAWA @USAGI
 * 	Kunihiro Ishiguro <[email protected]>
 * 		IPv6 support
 * 	YOSHIFUJI Hideaki
 * 		Split up af-specific portion
 *
 */

#include <linux/err.h>
#include <linux/kernel.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 xfrm_policy_afinfo xfrm6_policy_afinfo;

static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos,
					  const xfrm_address_t *saddr,
					  const xfrm_address_t *daddr)
{
	struct flowi6 fl6;
	struct dst_entry *dst;
	int err;

	memset(&fl6, 0, sizeof(fl6));
	memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
	if (saddr)
		memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));

	dst = ip6_route_output(net, NULL, &fl6);

	err = dst->error;
	if (dst->error) {
		dst_release(dst);
		dst = ERR_PTR(err);
	}

	return dst;
}

static int xfrm6_get_saddr(struct net *net,
			   xfrm_address_t *saddr, xfrm_address_t *daddr)
{
	struct dst_entry *dst;
	struct net_device *dev;

	dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
	if (IS_ERR(dst))
		return -EHOSTUNREACH;

	dev = ip6_dst_idev(dst)->dev;
	ipv6_dev_get_saddr(dev_net(dev), dev,
			   (struct in6_addr *)&daddr->a6, 0,
			   (struct in6_addr *)&saddr->a6);
	dst_release(dst);
	return 0;
}

static int xfrm6_get_tos(const struct flowi *fl)
{
	return 0;
}

static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
			   int nfheader_len)
{
	if (dst->ops->family == AF_INET6) {
		struct rt6_info *rt = (struct rt6_info*)dst;
		if (rt->rt6i_node)
			path->path_cookie = rt->rt6i_node->fn_sernum;
	}

	path->u.rt6.rt6i_nfheader_len = nfheader_len;

	return 0;
}

static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
			  const struct flowi *fl)
{
	struct rt6_info *rt = (struct rt6_info*)xdst->route;

	xdst->u.dst.dev = dev;
	dev_hold(dev);

	xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
	if (!xdst->u.rt6.rt6i_idev)
		return -ENODEV;

	xdst->u.rt6.rt6i_peer = rt->rt6i_peer;
	if (rt->rt6i_peer)
		atomic_inc(&rt->rt6i_peer->refcnt);

	/* Sheit... I remember I did this right. Apparently,
	 * it was magically lost, so this code needs audit */
	xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
						   RTF_LOCAL);
	xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
	xdst->u.rt6.rt6i_node = rt->rt6i_node;
	if (rt->rt6i_node)
		xdst->route_cookie = rt->rt6i_node->fn_sernum;
	xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
	xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
	xdst->u.rt6.rt6i_src = rt->rt6i_src;

	return 0;
}

static inline void
_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
{
	struct flowi6 *fl6 = &fl->u.ip6;
	int onlyproto = 0;
	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(fl6, 0, sizeof(struct flowi6));
	fl6->flowi6_mark = skb->mark;

	ipv6_addr_copy(&fl6->daddr, reverse ? &hdr->saddr : &hdr->daddr);
	ipv6_addr_copy(&fl6->saddr, reverse ? &hdr->daddr : &hdr->saddr);

	while (nh + offset + 1 < skb->data ||
	       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_FRAGMENT:
			onlyproto = 1;
		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 (!onlyproto && (nh + offset + 4 < skb->data ||
			     pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
				__be16 *ports = (__be16 *)exthdr;

				fl6->fl6_sport = ports[!!reverse];
				fl6->fl6_dport = ports[!reverse];
			}
			fl6->flowi6_proto = nexthdr;
			return;

		case IPPROTO_ICMPV6:
			if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
				u8 *icmp = (u8 *)exthdr;

				fl6->fl6_icmp_type = icmp[0];
				fl6->fl6_icmp_code = icmp[1];
			}
			fl6->flowi6_proto = nexthdr;
			return;

#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
		case IPPROTO_MH:
			if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
				struct ip6_mh *mh;
				mh = (struct ip6_mh *)exthdr;

				fl6->fl6_mh_type = mh->ip6mh_type;
			}
			fl6->flowi6_proto = nexthdr;
			return;
#endif

		/* XXX Why are there these headers? */
		case IPPROTO_AH:
		case IPPROTO_ESP:
		case IPPROTO_COMP:
		default:
			fl6->fl6_ipsec_spi = 0;
			fl6->flowi6_proto = nexthdr;
			return;
		}
	}
}

static inline int xfrm6_garbage_collect(struct dst_ops *ops)
{
	struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);

	xfrm6_policy_afinfo.garbage_collect(net);
	return dst_entries_get_fast(ops) > 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);
	dst_destroy_metrics_generic(dst);
	if (likely(xdst->u.rt6.rt6i_peer))
		inet_putpeer(xdst->u.rt6.rt6i_peer);
	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(dev_net(dev)->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 =		cpu_to_be16(ETH_P_IPV6),
	.gc =			xfrm6_garbage_collect,
	.update_pmtu =		xfrm6_update_pmtu,
	.cow_metrics =		dst_cow_metrics_generic,
	.destroy =		xfrm6_dst_destroy,
	.ifdown =		xfrm6_dst_ifdown,
	.local_out =		__ip6_local_out,
	.gc_thresh =		1024,
};

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,
	.decode_session =	_decode_session6,
	.get_tos =		xfrm6_get_tos,
	.init_path =		xfrm6_init_path,
	.fill_dst =		xfrm6_fill_dst,
	.blackhole_route =	ip6_blackhole_route,
};

static int __init xfrm6_policy_init(void)
{
	return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
}

static void xfrm6_policy_fini(void)
{
	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
}

#ifdef CONFIG_SYSCTL
static struct ctl_table xfrm6_policy_table[] = {
	{
		.procname       = "xfrm6_gc_thresh",
		.data	   	= &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
		.maxlen	 	= sizeof(int),
		.mode	   	= 0644,
		.proc_handler   = proc_dointvec,
	},
	{ }
};

static struct ctl_table_header *sysctl_hdr;
#endif

int __init xfrm6_init(void)
{
	int ret;
	unsigned int gc_thresh;

	/*
	 * We need a good default value for the xfrm6 gc threshold.
	 * In ipv4 we set it to the route hash table size * 8, which
	 * is half the size of the maximaum route cache for ipv4.  It
	 * would be good to do the same thing for v6, except the table is
	 * constructed differently here.  Here each table for a net namespace
	 * can have FIB_TABLE_HASHSZ entries, so lets go with the same
	 * computation that we used for ipv4 here.  Also, lets keep the initial
	 * gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
	 * to that as a minimum as well
	 */
	gc_thresh = FIB6_TABLE_HASHSZ * 8;
	xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
	dst_entries_init(&xfrm6_dst_ops);

	ret = xfrm6_policy_init();
	if (ret) {
		dst_entries_destroy(&xfrm6_dst_ops);
		goto out;
	}
	ret = xfrm6_state_init();
	if (ret)
		goto out_policy;

#ifdef CONFIG_SYSCTL
	sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
						xfrm6_policy_table);
#endif
out:
	return ret;
out_policy:
	xfrm6_policy_fini();
	goto out;
}

void xfrm6_fini(void)
{
#ifdef CONFIG_SYSCTL
	if (sysctl_hdr)
		unregister_net_sysctl_table(sysctl_hdr);
#endif
	//xfrm6_input_fini();
	xfrm6_policy_fini();
	xfrm6_state_fini();
	dst_entries_destroy(&xfrm6_dst_ops);
}
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 <[email protected]>
	8	* IPv6 support
	9	* YOSHIFUJI Hideaki
	10	* Split up af-specific portion
1ab1457c	11	*
1da177e4 LT	12	*/
1da177e4 LT	13
66cdb3ca HX	14	#include <linux/err.h>
66cdb3ca HX	15	#include <linux/kernel.h>
aabc9761 HX	16	#include <linux/netdevice.h>
aabc9761 HX	17	#include <net/addrconf.h>
45ff5a3f	18	#include <net/dst.h>
1da177e4 LT	19	#include <net/xfrm.h>
	20	#include <net/ip.h>
	21	#include <net/ipv6.h>
	22	#include <net/ip6_route.h>
59fbb3a6	23	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
2ce4272a MN	24	#include <net/mip6.h>
2ce4272a MN	25	#endif
1da177e4	26
1da177e4 LT	27	static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
1da177e4 LT	28
c5b3cf46	29	static struct dst_entry xfrm6_dst_lookup(struct net net, int tos,
5e6b930f DM	30	const xfrm_address_t *saddr,
5e6b930f DM	31	const xfrm_address_t *daddr)
1da177e4	32	{
7e1dc7b6	33	struct flowi6 fl6;
66cdb3ca HX	34	struct dst_entry *dst;
	35	int err;
	36
7e1dc7b6 DM	37	memset(&fl6, 0, sizeof(fl6));
7e1dc7b6 DM	38	memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
66cdb3ca	39	if (saddr)
7e1dc7b6	40	memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
66cdb3ca	41
4c9483b2	42	dst = ip6_route_output(net, NULL, &fl6);
66cdb3ca HX	43
	44	err = dst->error;
	45	if (dst->error) {
4251320f	46	dst_release(dst);
66cdb3ca HX	47	dst = ERR_PTR(err);
	48	}
	49
	50	return dst;
1da177e4 LT	51	}
1da177e4 LT	52
fbda33b2 AD	53	static int xfrm6_get_saddr(struct net *net,
fbda33b2 AD	54	xfrm_address_t saddr, xfrm_address_t daddr)
a1e59abf	55	{
66cdb3ca	56	struct dst_entry *dst;
191cd582	57	struct net_device *dev;
66cdb3ca	58
fbda33b2	59	dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
66cdb3ca HX	60	if (IS_ERR(dst))
	61	return -EHOSTUNREACH;
	62
191cd582 BH	63	dev = ip6_dst_idev(dst)->dev;
191cd582 BH	64	ipv6_dev_get_saddr(dev_net(dev), dev,
7cbca67c	65	(struct in6_addr *)&daddr->a6, 0,
5e5f3f0f	66	(struct in6_addr *)&saddr->a6);
66cdb3ca HX	67	dst_release(dst);
66cdb3ca HX	68	return 0;
a1e59abf PM	69	}
a1e59abf PM	70
05d84025	71	static int xfrm6_get_tos(const struct flowi *fl)
1da177e4	72	{
25ee3286 HX	73	return 0;
25ee3286 HX	74	}
1da177e4	75
a1b05140 MN	76	static int xfrm6_init_path(struct xfrm_dst path, struct dst_entry dst,
	77	int nfheader_len)
	78	{
	79	if (dst->ops->family == AF_INET6) {
	80	struct rt6_info rt = (struct rt6_info)dst;
	81	if (rt->rt6i_node)
	82	path->path_cookie = rt->rt6i_node->fn_sernum;
	83	}
	84
	85	path->u.rt6.rt6i_nfheader_len = nfheader_len;
	86
	87	return 0;
	88	}
	89
87c1e12b	90	static int xfrm6_fill_dst(struct xfrm_dst xdst, struct net_device dev,
0c7b3eef	91	const struct flowi *fl)
25ee3286 HX	92	{
25ee3286 HX	93	struct rt6_info rt = (struct rt6_info)xdst->route;
1da177e4	94
25ee3286 HX	95	xdst->u.dst.dev = dev;
25ee3286 HX	96	dev_hold(dev);
1da177e4	97
bc8e4b95	98	xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
25ee3286 HX	99	if (!xdst->u.rt6.rt6i_idev)
25ee3286 HX	100	return -ENODEV;
1da177e4	101
7cc2edb8 DM	102	xdst->u.rt6.rt6i_peer = rt->rt6i_peer;
	103	if (rt->rt6i_peer)
	104	atomic_inc(&rt->rt6i_peer->refcnt);
	105
25ee3286 HX	106	/* Sheit... I remember I did this right. Apparently,
	107	* it was magically lost, so this code needs audit */
	108	xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST \|
	109	RTF_LOCAL);
	110	xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
	111	xdst->u.rt6.rt6i_node = rt->rt6i_node;
a1b05140 MN	112	if (rt->rt6i_node)
a1b05140 MN	113	xdst->route_cookie = rt->rt6i_node->fn_sernum;
25ee3286 HX	114	xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
	115	xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
	116	xdst->u.rt6.rt6i_src = rt->rt6i_src;
1da177e4	117
1da177e4	118	return 0;
1da177e4 LT	119	}
	120
	121	static inline void
d5422efe	122	_decode_session6(struct sk_buff skb, struct flowi fl, int reverse)
1da177e4	123	{
7e1dc7b6	124	struct flowi6 *fl6 = &fl->u.ip6;
7e3a42a1	125	int onlyproto = 0;
cfe1fc77	126	u16 offset = skb_network_header_len(skb);
0660e03f	127	struct ipv6hdr *hdr = ipv6_hdr(skb);
e3cae904	128	struct ipv6_opt_hdr *exthdr;
d56f90a7 ACM	129	const unsigned char *nh = skb_network_header(skb);
d56f90a7 ACM	130	u8 nexthdr = nh[IP6CB(skb)->nhoff];
1da177e4	131
7e1dc7b6 DM	132	memset(fl6, 0, sizeof(struct flowi6));
7e1dc7b6 DM	133	fl6->flowi6_mark = skb->mark;
44b451f1	134
7e1dc7b6 DM	135	ipv6_addr_copy(&fl6->daddr, reverse ? &hdr->saddr : &hdr->daddr);
7e1dc7b6 DM	136	ipv6_addr_copy(&fl6->saddr, reverse ? &hdr->daddr : &hdr->saddr);
1da177e4	137
59cae009 WY	138	while (nh + offset + 1 < skb->data \|\|
59cae009 WY	139	pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
d56f90a7 ACM	140	nh = skb_network_header(skb);
d56f90a7 ACM	141	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
e3cae904	142
1da177e4	143	switch (nexthdr) {
7e3a42a1 ND	144	case NEXTHDR_FRAGMENT:
7e3a42a1 ND	145	onlyproto = 1;
1da177e4 LT	146	case NEXTHDR_ROUTING:
	147	case NEXTHDR_HOP:
	148	case NEXTHDR_DEST:
	149	offset += ipv6_optlen(exthdr);
	150	nexthdr = exthdr->nexthdr;
d56f90a7	151	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
1da177e4 LT	152	break;
	153
	154	case IPPROTO_UDP:
ba4e58ec	155	case IPPROTO_UDPLITE:
1da177e4 LT	156	case IPPROTO_TCP:
1da177e4 LT	157	case IPPROTO_SCTP:
9e999993	158	case IPPROTO_DCCP:
59cae009 WY	159	if (!onlyproto && (nh + offset + 4 < skb->data \|\|
59cae009 WY	160	pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
8c689a6e	161	__be16 ports = (__be16 )exthdr;
1da177e4	162
1958b856 DM	163	fl6->fl6_sport = ports[!!reverse];
1958b856 DM	164	fl6->fl6_dport = ports[!reverse];
1da177e4	165	}
7e1dc7b6	166	fl6->flowi6_proto = nexthdr;
1da177e4 LT	167	return;
	168
	169	case IPPROTO_ICMPV6:
7e3a42a1	170	if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
1da177e4 LT	171	u8 icmp = (u8 )exthdr;
1da177e4 LT	172
1958b856 DM	173	fl6->fl6_icmp_type = icmp[0];
1958b856 DM	174	fl6->fl6_icmp_code = icmp[1];
1da177e4	175	}
7e1dc7b6	176	fl6->flowi6_proto = nexthdr;
1da177e4 LT	177	return;
1da177e4 LT	178
59fbb3a6	179	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
2ce4272a	180	case IPPROTO_MH:
7e3a42a1	181	if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
2ce4272a MN	182	struct ip6_mh *mh;
	183	mh = (struct ip6_mh *)exthdr;
	184
1958b856	185	fl6->fl6_mh_type = mh->ip6mh_type;
2ce4272a	186	}
7e1dc7b6	187	fl6->flowi6_proto = nexthdr;
2ce4272a MN	188	return;
	189	#endif
	190
1da177e4 LT	191	/* XXX Why are there these headers? */
	192	case IPPROTO_AH:
	193	case IPPROTO_ESP:
	194	case IPPROTO_COMP:
	195	default:
1958b856	196	fl6->fl6_ipsec_spi = 0;
7e1dc7b6	197	fl6->flowi6_proto = nexthdr;
1da177e4	198	return;
3ff50b79	199	}
1da177e4 LT	200	}
	201	}
	202
569d3645	203	static inline int xfrm6_garbage_collect(struct dst_ops *ops)
1da177e4	204	{
d7c7544c AD	205	struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
	206
	207	xfrm6_policy_afinfo.garbage_collect(net);
fc66f95c	208	return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
1da177e4 LT	209	}
	210
	211	static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
	212	{
	213	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	214	struct dst_entry *path = xdst->route;
	215
	216	path->ops->update_pmtu(path, mtu);
	217	}
	218
aabc9761 HX	219	static void xfrm6_dst_destroy(struct dst_entry *dst)
	220	{
	221	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	222
	223	if (likely(xdst->u.rt6.rt6i_idev))
	224	in6_dev_put(xdst->u.rt6.rt6i_idev);
62fa8a84	225	dst_destroy_metrics_generic(dst);
7cc2edb8 DM	226	if (likely(xdst->u.rt6.rt6i_peer))
7cc2edb8 DM	227	inet_putpeer(xdst->u.rt6.rt6i_peer);
aabc9761 HX	228	xfrm_dst_destroy(xdst);
	229	}
	230
	231	static void xfrm6_dst_ifdown(struct dst_entry dst, struct net_device dev,
	232	int unregister)
	233	{
	234	struct xfrm_dst *xdst;
	235
	236	if (!unregister)
	237	return;
	238
	239	xdst = (struct xfrm_dst *)dst;
	240	if (xdst->u.rt6.rt6i_idev->dev == dev) {
5a3e55d6	241	struct inet6_dev *loopback_idev =
c346dca1	242	in6_dev_get(dev_net(dev)->loopback_dev);
aabc9761 HX	243	BUG_ON(!loopback_idev);
	244
	245	do {
	246	in6_dev_put(xdst->u.rt6.rt6i_idev);
	247	xdst->u.rt6.rt6i_idev = loopback_idev;
	248	in6_dev_hold(loopback_idev);
	249	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	250	} while (xdst->u.dst.xfrm);
	251
	252	__in6_dev_put(loopback_idev);
	253	}
	254
	255	xfrm_dst_ifdown(dst, dev);
	256	}
	257
1da177e4 LT	258	static struct dst_ops xfrm6_dst_ops = {
1da177e4 LT	259	.family = AF_INET6,
09640e63	260	.protocol = cpu_to_be16(ETH_P_IPV6),
1da177e4 LT	261	.gc = xfrm6_garbage_collect,
1da177e4 LT	262	.update_pmtu = xfrm6_update_pmtu,
62fa8a84	263	.cow_metrics = dst_cow_metrics_generic,
aabc9761 HX	264	.destroy = xfrm6_dst_destroy,
aabc9761 HX	265	.ifdown = xfrm6_dst_ifdown,
862b82c6	266	.local_out = __ip6_local_out,
1da177e4	267	.gc_thresh = 1024,
1da177e4 LT	268	};
	269
	270	static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	271	.family = AF_INET6,
1da177e4 LT	272	.dst_ops = &xfrm6_dst_ops,
1da177e4 LT	273	.dst_lookup = xfrm6_dst_lookup,
a1e59abf	274	.get_saddr = xfrm6_get_saddr,
1da177e4	275	.decode_session = _decode_session6,
25ee3286	276	.get_tos = xfrm6_get_tos,
a1b05140	277	.init_path = xfrm6_init_path,
25ee3286	278	.fill_dst = xfrm6_fill_dst,
2774c131	279	.blackhole_route = ip6_blackhole_route,
1da177e4 LT	280	};
1da177e4 LT	281
0013caba	282	static int __init xfrm6_policy_init(void)
1da177e4	283	{
0013caba	284	return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
1da177e4 LT	285	}
	286
	287	static void xfrm6_policy_fini(void)
	288	{
	289	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
	290	}
	291
db71789c	292	#ifdef CONFIG_SYSCTL
a44a4a00 NH	293	static struct ctl_table xfrm6_policy_table[] = {
a44a4a00 NH	294	{
a44a4a00	295	.procname = "xfrm6_gc_thresh",
d7c7544c	296	.data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
a44a4a00 NH	297	.maxlen = sizeof(int),
	298	.mode = 0644,
	299	.proc_handler = proc_dointvec,
	300	},
	301	{ }
	302	};
	303
	304	static struct ctl_table_header *sysctl_hdr;
db71789c	305	#endif
a44a4a00	306
0013caba	307	int __init xfrm6_init(void)
1da177e4	308	{
0013caba	309	int ret;
a33bc5c1	310	unsigned int gc_thresh;
0013caba	311
a33bc5c1 NH	312	/*
	313	* We need a good default value for the xfrm6 gc threshold.
	314	* In ipv4 we set it to the route hash table size * 8, which
	315	* is half the size of the maximaum route cache for ipv4. It
	316	* would be good to do the same thing for v6, except the table is
	317	* constructed differently here. Here each table for a net namespace
	318	* can have FIB_TABLE_HASHSZ entries, so lets go with the same
	319	* computation that we used for ipv4 here. Also, lets keep the initial
	320	* gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
	321	* to that as a minimum as well
	322	*/
	323	gc_thresh = FIB6_TABLE_HASHSZ * 8;
	324	xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
fc66f95c	325	dst_entries_init(&xfrm6_dst_ops);
d7c7544c AD	326
d7c7544c AD	327	ret = xfrm6_policy_init();
fc66f95c ED	328	if (ret) {
fc66f95c ED	329	dst_entries_destroy(&xfrm6_dst_ops);
d7c7544c	330	goto out;
fc66f95c	331	}
d7c7544c AD	332	ret = xfrm6_state_init();
	333	if (ret)
	334	goto out_policy;
	335
db71789c	336	#ifdef CONFIG_SYSCTL
a44a4a00 NH	337	sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
a44a4a00 NH	338	xfrm6_policy_table);
db71789c	339	#endif
0013caba DL	340	out:
	341	return ret;
	342	out_policy:
	343	xfrm6_policy_fini();
	344	goto out;
1da177e4 LT	345	}
	346
	347	void xfrm6_fini(void)
	348	{
db71789c	349	#ifdef CONFIG_SYSCTL
a44a4a00 NH	350	if (sysctl_hdr)
a44a4a00 NH	351	unregister_net_sysctl_table(sysctl_hdr);
db71789c	352	#endif
1da177e4 LT	353	//xfrm6_input_fini();
	354	xfrm6_policy_fini();
	355	xfrm6_state_fini();
fc66f95c	356	dst_entries_destroy(&xfrm6_dst_ops);
1da177e4	357	}