// SPDX-License-Identifier: GPL-2.0
/*
 * 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/l3mdev.h>

static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif,
					  const xfrm_address_t *saddr,
					  const xfrm_address_t *daddr,
					  u32 mark)
{
	struct flowi6 fl6;
	struct dst_entry *dst;
	int err;

	memset(&fl6, 0, sizeof(fl6));
	fl6.flowi6_oif = l3mdev_master_ifindex_by_index(net, oif);
	fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
	fl6.flowi6_mark = mark;
	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,
			   u32 mark)
{
	struct dst_entry *dst;
	struct net_device *dev;

	dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark);
	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_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->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;
	INIT_LIST_HEAD(&xdst->u.rt6.rt6i_uncached);
	rt6_uncached_list_add(&xdst->u.rt6);
	atomic_inc(&dev_net(dev)->ipv6.rt6_stats->fib_rt_uncache);

	return 0;
}

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);
	if (xdst->u.rt6.rt6i_uncached_list)
		rt6_uncached_list_del(&xdst->u.rt6);
	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);

		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 *)xfrm_dst_child(&xdst->u.dst);
		} while (xdst->u.dst.xfrm);

		__in6_dev_put(loopback_idev);
	}

	xfrm_dst_ifdown(dst, dev);
}

static struct dst_ops xfrm6_dst_ops_template = {
	.family =		AF_INET6,
	.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 const struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
	.dst_ops =		&xfrm6_dst_ops_template,
	.dst_lookup =		xfrm6_dst_lookup,
	.get_saddr =		xfrm6_get_saddr,
	.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, AF_INET6);
}

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_sysctl_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_sysctl_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);
}
#else /* CONFIG_SYSCTL */
static inline int xfrm6_net_sysctl_init(struct net *net)
{
	return 0;
}

static inline void xfrm6_net_sysctl_exit(struct net *net)
{
}
#endif

static int __net_init xfrm6_net_init(struct net *net)
{
	int ret;

	memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template,
	       sizeof(xfrm6_dst_ops_template));
	ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops);
	if (ret)
		return ret;

	ret = xfrm6_net_sysctl_init(net);
	if (ret)
		dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);

	return ret;
}

static void __net_exit xfrm6_net_exit(struct net *net)
{
	xfrm6_net_sysctl_exit(net);
	dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
}

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

int __init xfrm6_init(void)
{
	int ret;

	ret = xfrm6_policy_init();
	if (ret)
		goto out;
	ret = xfrm6_state_init();
	if (ret)
		goto out_policy;

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

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

void xfrm6_fini(void)
{
	unregister_pernet_subsys(&xfrm6_net_ops);
	xfrm6_protocol_fini();
	xfrm6_policy_fini();
	xfrm6_state_fini();
}