[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/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>
#include <net/vrf.h>
#if IS_ENABLED(CONFIG_IPV6_MIP6)
#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, int oif,
					  const xfrm_address_t *saddr,
					  const xfrm_address_t *daddr)
{
	struct flowi6 fl6;
	struct dst_entry *dst;
	int err;

	memset(&fl6, 0, sizeof(fl6));
	fl6.flowi6_oif = oif;
	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, int oif,
			   xfrm_address_t *saddr, xfrm_address_t *daddr)
{
	struct dst_entry *dst;
	struct net_device *dev;

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

	dev = ip6_dst_idev(dst)->dev;
	ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
	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;
		path->path_cookie = rt6_get_cookie(rt);
	}

	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) {
		dev_put(dev);
		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;
	xdst->route_cookie = rt6_get_cookie(rt);
	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;
	const struct ipv6hdr *hdr = ipv6_hdr(skb);
	u16 offset = sizeof(*hdr);
	struct ipv6_opt_hdr *exthdr;
	const unsigned char *nh = skb_network_header(skb);
	u16 nhoff = IP6CB(skb)->nhoff;
	int oif = 0;
	u8 nexthdr;

	if (!nhoff)
		nhoff = offsetof(struct ipv6hdr, nexthdr);

	nexthdr = nh[nhoff];

	if (skb_dst(skb)) {
		oif = vrf_master_ifindex(skb_dst(skb)->dev) ?
			: skb_dst(skb)->dev->ifindex;
	}

	memset(fl6, 0, sizeof(struct flowi6));
	fl6->flowi6_mark = skb->mark;
	fl6->flowi6_oif = reverse ? skb->skb_iif : oif;

	fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
	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;

				nh = skb_network_header(skb);
				ports = (__be16 *)(nh + offset);
				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;

				nh = skb_network_header(skb);
				icmp = (u8 *)(nh + offset);
				fl6->fl6_icmp_type = icmp[0];
				fl6->fl6_icmp_code = icmp[1];
			}
			fl6->flowi6_proto = nexthdr;
			return;

#if IS_ENABLED(CONFIG_IPV6_MIP6)
		case IPPROTO_MH:
			offset += ipv6_optlen(exthdr);
			if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
				struct ip6_mh *mh;

				nh = skb_network_header(skb);
				mh = (struct ip6_mh *)(nh + offset);
				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, struct sock *sk,
			      struct sk_buff *skb, u32 mtu)
{
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
	struct dst_entry *path = xdst->route;

	path->ops->update_pmtu(path, sk, skb, mtu);
}

static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
			   struct sk_buff *skb)
{
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
	struct dst_entry *path = xdst->route;

	path->ops->redirect(path, sk, skb);
}

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);
	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,
	.gc =			xfrm6_garbage_collect,
	.update_pmtu =		xfrm6_update_pmtu,
	.redirect =		xfrm6_redirect,
	.cow_metrics =		dst_cow_metrics_generic,
	.destroy =		xfrm6_dst_destroy,
	.ifdown =		xfrm6_dst_ifdown,
	.local_out =		__ip6_local_out,
	.gc_thresh =		32768,
};

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 int __net_init xfrm6_net_init(struct net *net)
{
	struct ctl_table *table;
	struct ctl_table_header *hdr;

	table = xfrm6_policy_table;
	if (!net_eq(net, &init_net)) {
		table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
		if (!table)
			goto err_alloc;

		table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
	}

	hdr = register_net_sysctl(net, "net/ipv6", table);
	if (!hdr)
		goto err_reg;

	net->ipv6.sysctl.xfrm6_hdr = hdr;
	return 0;

err_reg:
	if (!net_eq(net, &init_net))
		kfree(table);
err_alloc:
	return -ENOMEM;
}

static void __net_exit xfrm6_net_exit(struct net *net)
{
	struct ctl_table *table;

	if (!net->ipv6.sysctl.xfrm6_hdr)
		return;

	table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg;
	unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr);
	if (!net_eq(net, &init_net))
		kfree(table);
}

static struct pernet_operations xfrm6_net_ops = {
	.init	= xfrm6_net_init,
	.exit	= xfrm6_net_exit,
};
#endif

int __init xfrm6_init(void)
{
	int ret;

	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;

	ret = xfrm6_protocol_init();
	if (ret)
		goto out_state;

#ifdef CONFIG_SYSCTL
	register_pernet_subsys(&xfrm6_net_ops);
#endif
out:
	return ret;
out_state:
	xfrm6_state_fini();
out_policy:
	xfrm6_policy_fini();
	goto out;
}

void xfrm6_fini(void)
{
#ifdef CONFIG_SYSCTL
	unregister_pernet_subsys(&xfrm6_net_ops);
#endif
	xfrm6_protocol_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
67ba4152 IM	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>
4ec3b28c	23	#include <net/vrf.h>
07a93626	24	#if IS_ENABLED(CONFIG_IPV6_MIP6)
2ce4272a MN	25	#include <net/mip6.h>
2ce4272a MN	26	#endif
1da177e4	27
1da177e4 LT	28	static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
1da177e4 LT	29
42a7b32b	30	static struct dst_entry xfrm6_dst_lookup(struct net net, int tos, int oif,
5e6b930f DM	31	const xfrm_address_t *saddr,
5e6b930f DM	32	const xfrm_address_t *daddr)
1da177e4	33	{
7e1dc7b6	34	struct flowi6 fl6;
66cdb3ca HX	35	struct dst_entry *dst;
	36	int err;
	37
7e1dc7b6	38	memset(&fl6, 0, sizeof(fl6));
42a7b32b	39	fl6.flowi6_oif = oif;
7e1dc7b6	40	memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
66cdb3ca	41	if (saddr)
7e1dc7b6	42	memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
66cdb3ca	43
4c9483b2	44	dst = ip6_route_output(net, NULL, &fl6);
66cdb3ca HX	45
	46	err = dst->error;
	47	if (dst->error) {
4251320f	48	dst_release(dst);
66cdb3ca HX	49	dst = ERR_PTR(err);
	50	}
	51
	52	return dst;
1da177e4 LT	53	}
1da177e4 LT	54
42a7b32b	55	static int xfrm6_get_saddr(struct net *net, int oif,
fbda33b2	56	xfrm_address_t saddr, xfrm_address_t daddr)
a1e59abf	57	{
66cdb3ca	58	struct dst_entry *dst;
191cd582	59	struct net_device *dev;
66cdb3ca	60
42a7b32b	61	dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr);
66cdb3ca HX	62	if (IS_ERR(dst))
	63	return -EHOSTUNREACH;
	64
191cd582	65	dev = ip6_dst_idev(dst)->dev;
15e318bd	66	ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
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) {
67ba4152	80	struct rt6_info rt = (struct rt6_info )dst;
b197df4f	81	path->path_cookie = rt6_get_cookie(rt);
a1b05140 MN	82	}
	83
	84	path->u.rt6.rt6i_nfheader_len = nfheader_len;
	85
	86	return 0;
	87	}
	88
87c1e12b	89	static int xfrm6_fill_dst(struct xfrm_dst xdst, struct net_device dev,
0c7b3eef	90	const struct flowi *fl)
25ee3286	91	{
67ba4152	92	struct rt6_info rt = (struct rt6_info )xdst->route;
1da177e4	93
25ee3286 HX	94	xdst->u.dst.dev = dev;
25ee3286 HX	95	dev_hold(dev);
1da177e4	96
bc8e4b95	97	xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
84c4a9df CW	98	if (!xdst->u.rt6.rt6i_idev) {
84c4a9df CW	99	dev_put(dev);
25ee3286	100	return -ENODEV;
84c4a9df	101	}
1da177e4	102
25ee3286 HX	103	/* Sheit... I remember I did this right. Apparently,
	104	* it was magically lost, so this code needs audit */
	105	xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST \|
	106	RTF_LOCAL);
	107	xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
	108	xdst->u.rt6.rt6i_node = rt->rt6i_node;
b197df4f	109	xdst->route_cookie = rt6_get_cookie(rt);
25ee3286 HX	110	xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
	111	xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
	112	xdst->u.rt6.rt6i_src = rt->rt6i_src;
1da177e4	113
1da177e4	114	return 0;
1da177e4 LT	115	}
	116
	117	static inline void
d5422efe	118	_decode_session6(struct sk_buff skb, struct flowi fl, int reverse)
1da177e4	119	{
7e1dc7b6	120	struct flowi6 *fl6 = &fl->u.ip6;
7e3a42a1	121	int onlyproto = 0;
b71d1d42	122	const struct ipv6hdr *hdr = ipv6_hdr(skb);
de3b7a06	123	u16 offset = sizeof(*hdr);
e3cae904	124	struct ipv6_opt_hdr *exthdr;
d56f90a7	125	const unsigned char *nh = skb_network_header(skb);
f8556919	126	u16 nhoff = IP6CB(skb)->nhoff;
84502b5e	127	int oif = 0;
f8556919 SK	128	u8 nexthdr;
	129
	130	if (!nhoff)
	131	nhoff = offsetof(struct ipv6hdr, nexthdr);
	132
	133	nexthdr = nh[nhoff];
84502b5e	134
4ec3b28c DA	135	if (skb_dst(skb)) {
	136	oif = vrf_master_ifindex(skb_dst(skb)->dev) ?
	137	: skb_dst(skb)->dev->ifindex;
	138	}
1da177e4	139
7e1dc7b6 DM	140	memset(fl6, 0, sizeof(struct flowi6));
7e1dc7b6 DM	141	fl6->flowi6_mark = skb->mark;
84502b5e	142	fl6->flowi6_oif = reverse ? skb->skb_iif : oif;
44b451f1	143
4e3fd7a0 AD	144	fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
4e3fd7a0 AD	145	fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
1da177e4	146
59cae009 WY	147	while (nh + offset + 1 < skb->data \|\|
59cae009 WY	148	pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
d56f90a7 ACM	149	nh = skb_network_header(skb);
d56f90a7 ACM	150	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
e3cae904	151
1da177e4	152	switch (nexthdr) {
7e3a42a1 ND	153	case NEXTHDR_FRAGMENT:
7e3a42a1 ND	154	onlyproto = 1;
1da177e4 LT	155	case NEXTHDR_ROUTING:
	156	case NEXTHDR_HOP:
	157	case NEXTHDR_DEST:
	158	offset += ipv6_optlen(exthdr);
	159	nexthdr = exthdr->nexthdr;
d56f90a7	160	exthdr = (struct ipv6_opt_hdr *)(nh + offset);
1da177e4 LT	161	break;
	162
	163	case IPPROTO_UDP:
ba4e58ec	164	case IPPROTO_UDPLITE:
1da177e4 LT	165	case IPPROTO_TCP:
1da177e4 LT	166	case IPPROTO_SCTP:
9e999993	167	case IPPROTO_DCCP:
59cae009 WY	168	if (!onlyproto && (nh + offset + 4 < skb->data \|\|
59cae009 WY	169	pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
789f2023	170	__be16 *ports;
1da177e4	171
789f2023 LR	172	nh = skb_network_header(skb);
789f2023 LR	173	ports = (__be16 *)(nh + offset);
1958b856 DM	174	fl6->fl6_sport = ports[!!reverse];
1958b856 DM	175	fl6->fl6_dport = ports[!reverse];
1da177e4	176	}
7e1dc7b6	177	fl6->flowi6_proto = nexthdr;
1da177e4 LT	178	return;
	179
	180	case IPPROTO_ICMPV6:
7e3a42a1	181	if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
789f2023	182	u8 *icmp;
1da177e4	183
789f2023 LR	184	nh = skb_network_header(skb);
789f2023 LR	185	icmp = (u8 *)(nh + offset);
1958b856 DM	186	fl6->fl6_icmp_type = icmp[0];
1958b856 DM	187	fl6->fl6_icmp_code = icmp[1];
1da177e4	188	}
7e1dc7b6	189	fl6->flowi6_proto = nexthdr;
1da177e4 LT	190	return;
1da177e4 LT	191
07a93626	192	#if IS_ENABLED(CONFIG_IPV6_MIP6)
2ce4272a	193	case IPPROTO_MH:
cd3bafc7	194	offset += ipv6_optlen(exthdr);
7e3a42a1	195	if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
2ce4272a	196	struct ip6_mh *mh;
2ce4272a	197
789f2023 LR	198	nh = skb_network_header(skb);
789f2023 LR	199	mh = (struct ip6_mh *)(nh + offset);
1958b856	200	fl6->fl6_mh_type = mh->ip6mh_type;
2ce4272a	201	}
7e1dc7b6	202	fl6->flowi6_proto = nexthdr;
2ce4272a MN	203	return;
	204	#endif
	205
1da177e4 LT	206	/* XXX Why are there these headers? */
	207	case IPPROTO_AH:
	208	case IPPROTO_ESP:
	209	case IPPROTO_COMP:
	210	default:
1958b856	211	fl6->fl6_ipsec_spi = 0;
7e1dc7b6	212	fl6->flowi6_proto = nexthdr;
1da177e4	213	return;
3ff50b79	214	}
1da177e4 LT	215	}
	216	}
	217
569d3645	218	static inline int xfrm6_garbage_collect(struct dst_ops *ops)
1da177e4	219	{
d7c7544c AD	220	struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
	221
	222	xfrm6_policy_afinfo.garbage_collect(net);
fc66f95c	223	return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
1da177e4 LT	224	}
1da177e4 LT	225
6700c270 DM	226	static void xfrm6_update_pmtu(struct dst_entry dst, struct sock sk,
6700c270 DM	227	struct sk_buff *skb, u32 mtu)
1da177e4 LT	228	{
	229	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	230	struct dst_entry *path = xdst->route;
	231
6700c270	232	path->ops->update_pmtu(path, sk, skb, mtu);
1da177e4 LT	233	}
1da177e4 LT	234
6700c270 DM	235	static void xfrm6_redirect(struct dst_entry dst, struct sock sk,
6700c270 DM	236	struct sk_buff *skb)
ec18d9a2 DM	237	{
	238	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	239	struct dst_entry *path = xdst->route;
	240
6700c270	241	path->ops->redirect(path, sk, skb);
ec18d9a2 DM	242	}
ec18d9a2 DM	243
aabc9761 HX	244	static void xfrm6_dst_destroy(struct dst_entry *dst)
	245	{
	246	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	247
	248	if (likely(xdst->u.rt6.rt6i_idev))
	249	in6_dev_put(xdst->u.rt6.rt6i_idev);
62fa8a84	250	dst_destroy_metrics_generic(dst);
aabc9761 HX	251	xfrm_dst_destroy(xdst);
	252	}
	253
	254	static void xfrm6_dst_ifdown(struct dst_entry dst, struct net_device dev,
	255	int unregister)
	256	{
	257	struct xfrm_dst *xdst;
	258
	259	if (!unregister)
	260	return;
	261
	262	xdst = (struct xfrm_dst *)dst;
	263	if (xdst->u.rt6.rt6i_idev->dev == dev) {
5a3e55d6	264	struct inet6_dev *loopback_idev =
c346dca1	265	in6_dev_get(dev_net(dev)->loopback_dev);
aabc9761 HX	266	BUG_ON(!loopback_idev);
	267
	268	do {
	269	in6_dev_put(xdst->u.rt6.rt6i_idev);
	270	xdst->u.rt6.rt6i_idev = loopback_idev;
	271	in6_dev_hold(loopback_idev);
	272	xdst = (struct xfrm_dst *)xdst->u.dst.child;
	273	} while (xdst->u.dst.xfrm);
	274
	275	__in6_dev_put(loopback_idev);
	276	}
	277
	278	xfrm_dst_ifdown(dst, dev);
	279	}
	280
1da177e4 LT	281	static struct dst_ops xfrm6_dst_ops = {
1da177e4 LT	282	.family = AF_INET6,
1da177e4 LT	283	.gc = xfrm6_garbage_collect,
1da177e4 LT	284	.update_pmtu = xfrm6_update_pmtu,
ec18d9a2	285	.redirect = xfrm6_redirect,
62fa8a84	286	.cow_metrics = dst_cow_metrics_generic,
aabc9761 HX	287	.destroy = xfrm6_dst_destroy,
aabc9761 HX	288	.ifdown = xfrm6_dst_ifdown,
862b82c6	289	.local_out = __ip6_local_out,
eeb1b733	290	.gc_thresh = 32768,
1da177e4 LT	291	};
	292
	293	static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	294	.family = AF_INET6,
1da177e4 LT	295	.dst_ops = &xfrm6_dst_ops,
1da177e4 LT	296	.dst_lookup = xfrm6_dst_lookup,
67ba4152	297	.get_saddr = xfrm6_get_saddr,
1da177e4	298	.decode_session = _decode_session6,
25ee3286	299	.get_tos = xfrm6_get_tos,
a1b05140	300	.init_path = xfrm6_init_path,
25ee3286	301	.fill_dst = xfrm6_fill_dst,
2774c131	302	.blackhole_route = ip6_blackhole_route,
1da177e4 LT	303	};
1da177e4 LT	304
0013caba	305	static int __init xfrm6_policy_init(void)
1da177e4	306	{
0013caba	307	return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
1da177e4 LT	308	}
	309
	310	static void xfrm6_policy_fini(void)
	311	{
	312	xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
	313	}
	314
db71789c	315	#ifdef CONFIG_SYSCTL
a44a4a00 NH	316	static struct ctl_table xfrm6_policy_table[] = {
a44a4a00 NH	317	{
a44a4a00	318	.procname = "xfrm6_gc_thresh",
67ba4152 IM	319	.data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
	320	.maxlen = sizeof(int),
	321	.mode = 0644,
a44a4a00 NH	322	.proc_handler = proc_dointvec,
	323	},
	324	{ }
	325	};
	326
8d068875 MK	327	static int __net_init xfrm6_net_init(struct net *net)
	328	{
	329	struct ctl_table *table;
	330	struct ctl_table_header *hdr;
	331
	332	table = xfrm6_policy_table;
	333	if (!net_eq(net, &init_net)) {
	334	table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
	335	if (!table)
	336	goto err_alloc;
	337
	338	table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
	339	}
	340
	341	hdr = register_net_sysctl(net, "net/ipv6", table);
	342	if (!hdr)
	343	goto err_reg;
	344
	345	net->ipv6.sysctl.xfrm6_hdr = hdr;
	346	return 0;
	347
	348	err_reg:
	349	if (!net_eq(net, &init_net))
	350	kfree(table);
	351	err_alloc:
	352	return -ENOMEM;
	353	}
	354
	355	static void __net_exit xfrm6_net_exit(struct net *net)
	356	{
	357	struct ctl_table *table;
	358
63159f29	359	if (!net->ipv6.sysctl.xfrm6_hdr)
8d068875 MK	360	return;
	361
	362	table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg;
	363	unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr);
	364	if (!net_eq(net, &init_net))
	365	kfree(table);
	366	}
	367
	368	static struct pernet_operations xfrm6_net_ops = {
	369	.init = xfrm6_net_init,
	370	.exit = xfrm6_net_exit,
	371	};
db71789c	372	#endif
a44a4a00	373
0013caba	374	int __init xfrm6_init(void)
1da177e4	375	{
0013caba	376	int ret;
c3813286	377
fc66f95c	378	dst_entries_init(&xfrm6_dst_ops);
d7c7544c AD	379
d7c7544c AD	380	ret = xfrm6_policy_init();
fc66f95c ED	381	if (ret) {
fc66f95c ED	382	dst_entries_destroy(&xfrm6_dst_ops);
d7c7544c	383	goto out;
fc66f95c	384	}
d7c7544c AD	385	ret = xfrm6_state_init();
	386	if (ret)
	387	goto out_policy;
	388
7e14ea15 SK	389	ret = xfrm6_protocol_init();
	390	if (ret)
	391	goto out_state;
	392
db71789c	393	#ifdef CONFIG_SYSCTL
8d068875	394	register_pernet_subsys(&xfrm6_net_ops);
db71789c	395	#endif
0013caba DL	396	out:
0013caba DL	397	return ret;
7e14ea15 SK	398	out_state:
7e14ea15 SK	399	xfrm6_state_fini();
0013caba DL	400	out_policy:
	401	xfrm6_policy_fini();
	402	goto out;
1da177e4 LT	403	}
	404
	405	void xfrm6_fini(void)
	406	{
db71789c	407	#ifdef CONFIG_SYSCTL
8d068875	408	unregister_pernet_subsys(&xfrm6_net_ops);
db71789c	409	#endif
7e14ea15	410	xfrm6_protocol_fini();
1da177e4 LT	411	xfrm6_policy_fini();
1da177e4 LT	412	xfrm6_state_fini();
fc66f95c	413	dst_entries_destroy(&xfrm6_dst_ops);
1da177e4	414	}