[linux-block.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/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 dst_ops xfrm6_dst_ops;
static struct xfrm_policy_afinfo xfrm6_policy_afinfo;

static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos,
					  xfrm_address_t *saddr,
					  xfrm_address_t *daddr)
{
	struct flowi fl = {};
	struct dst_entry *dst;
	int err;

	memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
	if (saddr)
		memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));

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

	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 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 int xfrm6_get_tos(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)
{
	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(rt->u.dst.dev);
	if (!xdst->u.rt6.rt6i_idev)
		return -ENODEV;

	/* 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)
{
	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(fl, 0, sizeof(struct flowi));
	ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
	ipv6_addr_copy(&fl->fl6_src, 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;

				fl->fl_ip_sport = ports[!!reverse];
				fl->fl_ip_dport = ports[!reverse];
			}
			fl->proto = nexthdr;
			return;

		case IPPROTO_ICMPV6:
			if (!onlyproto && 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 (!onlyproto && 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(struct dst_ops *ops)
{
	xfrm6_policy_afinfo.garbage_collect(&init_net);
	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(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,
	.destroy =		xfrm6_dst_destroy,
	.ifdown =		xfrm6_dst_ifdown,
	.local_out =		__ip6_local_out,
	.gc_thresh =		1024,
	.entries =		ATOMIC_INIT(0),
};

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

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);
}

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

static struct ctl_table_header *sysctl_hdr;

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

	ret = xfrm6_policy_init();
	if (ret)
		goto out;

	ret = xfrm6_state_init();
	if (ret)
		goto out_policy;
	/*
	 * 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;

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

void xfrm6_fini(void)
{
	if (sysctl_hdr)
		unregister_net_sysctl_table(sysctl_hdr);
	//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
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 LT	26
	27	static struct dst_ops xfrm6_dst_ops;
	28	static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
	29
c5b3cf46 AD	30	static struct dst_entry xfrm6_dst_lookup(struct net net, int tos,
c5b3cf46 AD	31	xfrm_address_t *saddr,
66cdb3ca	32	xfrm_address_t *daddr)
1da177e4	33	{
66cdb3ca HX	34	struct flowi fl = {};
	35	struct dst_entry *dst;
	36	int err;
	37
	38	memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
	39	if (saddr)
	40	memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));
	41
c5b3cf46	42	dst = ip6_route_output(net, NULL, &fl);
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
1da177e4 LT	71	static struct dst_entry *
	72	__xfrm6_find_bundle(struct flowi fl, struct xfrm_policy policy)
	73	{
	74	struct dst_entry *dst;
	75
	76	/* Still not clear if we should set fl->fl6_{src,dst}... */
	77	read_lock_bh(&policy->lock);
	78	for (dst = policy->bundles; dst; dst = dst->next) {
	79	struct xfrm_dst xdst = (struct xfrm_dst)dst;
	80	struct in6_addr fl_dst_prefix, fl_src_prefix;
	81
	82	ipv6_addr_prefix(&fl_dst_prefix,
	83	&fl->fl6_dst,
	84	xdst->u.rt6.rt6i_dst.plen);
	85	ipv6_addr_prefix(&fl_src_prefix,
	86	&fl->fl6_src,
	87	xdst->u.rt6.rt6i_src.plen);
	88	if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
	89	ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
5b368e61	90	xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
e53820de MN	91	(xdst->u.rt6.rt6i_dst.plen != 128 \|\|
e53820de MN	92	xdst->u.rt6.rt6i_src.plen != 128))) {
1da177e4 LT	93	dst_clone(dst);
	94	break;
	95	}
	96	}
	97	read_unlock_bh(&policy->lock);
	98	return dst;
	99	}
	100
25ee3286	101	static int xfrm6_get_tos(struct flowi *fl)
1da177e4	102	{
25ee3286 HX	103	return 0;
25ee3286 HX	104	}
1da177e4	105
a1b05140 MN	106	static int xfrm6_init_path(struct xfrm_dst path, struct dst_entry dst,
	107	int nfheader_len)
	108	{
	109	if (dst->ops->family == AF_INET6) {
	110	struct rt6_info rt = (struct rt6_info)dst;
	111	if (rt->rt6i_node)
	112	path->path_cookie = rt->rt6i_node->fn_sernum;
	113	}
	114
	115	path->u.rt6.rt6i_nfheader_len = nfheader_len;
	116
	117	return 0;
	118	}
	119
25ee3286 HX	120	static int xfrm6_fill_dst(struct xfrm_dst xdst, struct net_device dev)
	121	{
	122	struct rt6_info rt = (struct rt6_info)xdst->route;
1da177e4	123
25ee3286 HX	124	xdst->u.dst.dev = dev;
25ee3286 HX	125	dev_hold(dev);
1da177e4	126
25ee3286 HX	127	xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
	128	if (!xdst->u.rt6.rt6i_idev)
	129	return -ENODEV;
1da177e4	130
25ee3286 HX	131	/* Sheit... I remember I did this right. Apparently,
	132	* it was magically lost, so this code needs audit */
	133	xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST \|
	134	RTF_LOCAL);
	135	xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
	136	xdst->u.rt6.rt6i_node = rt->rt6i_node;
a1b05140 MN	137	if (rt->rt6i_node)
a1b05140 MN	138	xdst->route_cookie = rt->rt6i_node->fn_sernum;
25ee3286 HX	139	xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
	140	xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
	141	xdst->u.rt6.rt6i_src = rt->rt6i_src;
1da177e4	142
1da177e4	143	return 0;
1da177e4 LT	144	}
	145
	146	static inline void
d5422efe	147	_decode_session6(struct sk_buff skb, struct flowi fl, int reverse)
1da177e4	148	{
7e3a42a1	149	int onlyproto = 0;
cfe1fc77	150	u16 offset = skb_network_header_len(skb);
0660e03f	151	struct ipv6hdr *hdr = ipv6_hdr(skb);
e3cae904	152	struct ipv6_opt_hdr *exthdr;
d56f90a7 ACM	153	const unsigned char *nh = skb_network_header(skb);
d56f90a7 ACM	154	u8 nexthdr = nh[IP6CB(skb)->nhoff];
1da177e4 LT	155
1da177e4 LT	156	memset(fl, 0, sizeof(struct flowi));
d5422efe HX	157	ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
d5422efe HX	158	ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);
1da177e4	159
59cae009 WY	160	while (nh + offset + 1 < skb->data \|\|
59cae009 WY	161	pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
d56f90a7 ACM	162	nh = skb_network_header(skb);
d56f90a7 ACM	163	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
e3cae904	164
1da177e4	165	switch (nexthdr) {
7e3a42a1 ND	166	case NEXTHDR_FRAGMENT:
7e3a42a1 ND	167	onlyproto = 1;
1da177e4 LT	168	case NEXTHDR_ROUTING:
	169	case NEXTHDR_HOP:
	170	case NEXTHDR_DEST:
	171	offset += ipv6_optlen(exthdr);
	172	nexthdr = exthdr->nexthdr;
d56f90a7	173	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
1da177e4 LT	174	break;
	175
	176	case IPPROTO_UDP:
ba4e58ec	177	case IPPROTO_UDPLITE:
1da177e4 LT	178	case IPPROTO_TCP:
1da177e4 LT	179	case IPPROTO_SCTP:
9e999993	180	case IPPROTO_DCCP:
59cae009 WY	181	if (!onlyproto && (nh + offset + 4 < skb->data \|\|
59cae009 WY	182	pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
8c689a6e	183	__be16 ports = (__be16 )exthdr;
1da177e4	184
d5422efe HX	185	fl->fl_ip_sport = ports[!!reverse];
d5422efe HX	186	fl->fl_ip_dport = ports[!reverse];
1da177e4 LT	187	}
	188	fl->proto = nexthdr;
	189	return;
	190
	191	case IPPROTO_ICMPV6:
7e3a42a1	192	if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
1da177e4 LT	193	u8 icmp = (u8 )exthdr;
	194
	195	fl->fl_icmp_type = icmp[0];
	196	fl->fl_icmp_code = icmp[1];
	197	}
	198	fl->proto = nexthdr;
	199	return;
	200
59fbb3a6	201	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
2ce4272a	202	case IPPROTO_MH:
7e3a42a1	203	if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
2ce4272a MN	204	struct ip6_mh *mh;
	205	mh = (struct ip6_mh *)exthdr;
	206
	207	fl->fl_mh_type = mh->ip6mh_type;
	208	}
	209	fl->proto = nexthdr;
	210	return;
	211	#endif
	212
1da177e4 LT	213	/* XXX Why are there these headers? */
	214	case IPPROTO_AH:
	215	case IPPROTO_ESP:
	216	case IPPROTO_COMP:
	217	default:
	218	fl->fl_ipsec_spi = 0;
	219	fl->proto = nexthdr;
	220	return;
3ff50b79	221	}
1da177e4 LT	222	}
	223	}
	224
569d3645	225	static inline int xfrm6_garbage_collect(struct dst_ops *ops)
1da177e4	226	{
ddcfd796	227	xfrm6_policy_afinfo.garbage_collect(&init_net);
1da177e4 LT	228	return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
	229	}
	230
	231	static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
	232	{
	233	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	234	struct dst_entry *path = xdst->route;
	235
	236	path->ops->update_pmtu(path, mtu);
	237	}
	238
aabc9761 HX	239	static void xfrm6_dst_destroy(struct dst_entry *dst)
	240	{
	241	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	242
	243	if (likely(xdst->u.rt6.rt6i_idev))
	244	in6_dev_put(xdst->u.rt6.rt6i_idev);
	245	xfrm_dst_destroy(xdst);
	246	}
	247
	248	static void xfrm6_dst_ifdown(struct dst_entry dst, struct net_device dev,
	249	int unregister)
	250	{
	251	struct xfrm_dst *xdst;
	252
	253	if (!unregister)
	254	return;
	255
	256	xdst = (struct xfrm_dst *)dst;
	257	if (xdst->u.rt6.rt6i_idev->dev == dev) {
5a3e55d6	258	struct inet6_dev *loopback_idev =
c346dca1	259	in6_dev_get(dev_net(dev)->loopback_dev);
aabc9761 HX	260	BUG_ON(!loopback_idev);
	261
	262	do {
	263	in6_dev_put(xdst->u.rt6.rt6i_idev);
	264	xdst->u.rt6.rt6i_idev = loopback_idev;
	265	in6_dev_hold(loopback_idev);
	266	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	267	} while (xdst->u.dst.xfrm);
	268
	269	__in6_dev_put(loopback_idev);
	270	}
	271
	272	xfrm_dst_ifdown(dst, dev);
	273	}
	274
1da177e4 LT	275	static struct dst_ops xfrm6_dst_ops = {
1da177e4 LT	276	.family = AF_INET6,
09640e63	277	.protocol = cpu_to_be16(ETH_P_IPV6),
1da177e4 LT	278	.gc = xfrm6_garbage_collect,
1da177e4 LT	279	.update_pmtu = xfrm6_update_pmtu,
aabc9761 HX	280	.destroy = xfrm6_dst_destroy,
aabc9761 HX	281	.ifdown = xfrm6_dst_ifdown,
862b82c6	282	.local_out = __ip6_local_out,
1da177e4	283	.gc_thresh = 1024,
e2422970	284	.entries = ATOMIC_INIT(0),
1da177e4 LT	285	};
	286
	287	static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	288	.family = AF_INET6,
1da177e4 LT	289	.dst_ops = &xfrm6_dst_ops,
1da177e4 LT	290	.dst_lookup = xfrm6_dst_lookup,
a1e59abf	291	.get_saddr = xfrm6_get_saddr,
1da177e4	292	.find_bundle = __xfrm6_find_bundle,
1da177e4	293	.decode_session = _decode_session6,
25ee3286	294	.get_tos = xfrm6_get_tos,
a1b05140	295	.init_path = xfrm6_init_path,
25ee3286	296	.fill_dst = xfrm6_fill_dst,
1da177e4 LT	297	};
1da177e4 LT	298
0013caba	299	static int __init xfrm6_policy_init(void)
1da177e4	300	{
0013caba	301	return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
1da177e4 LT	302	}
	303
	304	static void xfrm6_policy_fini(void)
	305	{
	306	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
	307	}
	308
a44a4a00 NH	309	static struct ctl_table xfrm6_policy_table[] = {
	310	{
	311	.ctl_name = CTL_UNNUMBERED,
	312	.procname = "xfrm6_gc_thresh",
	313	.data = &xfrm6_dst_ops.gc_thresh,
	314	.maxlen = sizeof(int),
	315	.mode = 0644,
	316	.proc_handler = proc_dointvec,
	317	},
	318	{ }
	319	};
	320
	321	static struct ctl_table_header *sysctl_hdr;
	322
0013caba	323	int __init xfrm6_init(void)
1da177e4	324	{
0013caba	325	int ret;
a33bc5c1	326	unsigned int gc_thresh;
0013caba DL	327
	328	ret = xfrm6_policy_init();
	329	if (ret)
	330	goto out;
	331
	332	ret = xfrm6_state_init();
	333	if (ret)
	334	goto out_policy;
a33bc5c1 NH	335	/*
	336	* We need a good default value for the xfrm6 gc threshold.
	337	* In ipv4 we set it to the route hash table size * 8, which
	338	* is half the size of the maximaum route cache for ipv4. It
	339	* would be good to do the same thing for v6, except the table is
	340	* constructed differently here. Here each table for a net namespace
	341	* can have FIB_TABLE_HASHSZ entries, so lets go with the same
	342	* computation that we used for ipv4 here. Also, lets keep the initial
	343	* gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
	344	* to that as a minimum as well
	345	*/
	346	gc_thresh = FIB6_TABLE_HASHSZ * 8;
	347	xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
	348
a44a4a00 NH	349	sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
a44a4a00 NH	350	xfrm6_policy_table);
0013caba DL	351	out:
	352	return ret;
	353	out_policy:
	354	xfrm6_policy_fini();
	355	goto out;
1da177e4 LT	356	}
	357
	358	void xfrm6_fini(void)
	359	{
a44a4a00 NH	360	if (sysctl_hdr)
a44a4a00 NH	361	unregister_net_sysctl_table(sysctl_hdr);
1da177e4 LT	362	//xfrm6_input_fini();
	363	xfrm6_policy_fini();
	364	xfrm6_state_fini();
	365	}