[linux.git] / net / ipv6 / fib6_rules.c

/*
 * net/ipv6/fib6_rules.c	IPv6 Routing Policy Rules
 *
 * Copyright (C)2003-2006 Helsinki University of Technology
 * Copyright (C)2003-2006 USAGI/WIDE Project
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License as
 *	published by the Free Software Foundation, version 2.
 *
 * Authors
 *	Thomas Graf		<[email protected]>
 *	Ville Nuorvala		<[email protected]>
 */

#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/export.h>

#include <net/fib_rules.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/netlink.h>

struct fib6_rule {
	struct fib_rule		common;
	struct rt6key		src;
	struct rt6key		dst;
	u8			tclass;
};

static bool fib6_rule_matchall(const struct fib_rule *rule)
{
	struct fib6_rule *r = container_of(rule, struct fib6_rule, common);

	if (r->dst.plen || r->src.plen || r->tclass)
		return false;
	return fib_rule_matchall(rule);
}

bool fib6_rule_default(const struct fib_rule *rule)
{
	if (!fib6_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL ||
	    rule->l3mdev)
		return false;
	if (rule->table != RT6_TABLE_LOCAL && rule->table != RT6_TABLE_MAIN)
		return false;
	return true;
}
EXPORT_SYMBOL_GPL(fib6_rule_default);

int fib6_rules_dump(struct net *net, struct notifier_block *nb)
{
	return fib_rules_dump(net, nb, AF_INET6);
}

unsigned int fib6_rules_seq_read(struct net *net)
{
	return fib_rules_seq_read(net, AF_INET6);
}

struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
				   const struct sk_buff *skb,
				   int flags, pol_lookup_t lookup)
{
	if (net->ipv6.fib6_has_custom_rules) {
		struct fib_lookup_arg arg = {
			.lookup_ptr = lookup,
			.lookup_data = skb,
			.flags = FIB_LOOKUP_NOREF,
		};

		/* update flow if oif or iif point to device enslaved to l3mdev */
		l3mdev_update_flow(net, flowi6_to_flowi(fl6));

		fib_rules_lookup(net->ipv6.fib6_rules_ops,
				 flowi6_to_flowi(fl6), flags, &arg);

		if (arg.result)
			return arg.result;
	} else {
		struct rt6_info *rt;

		rt = lookup(net, net->ipv6.fib6_local_tbl, fl6, skb, flags);
		if (rt != net->ipv6.ip6_null_entry && rt->dst.error != -EAGAIN)
			return &rt->dst;
		ip6_rt_put(rt);
		rt = lookup(net, net->ipv6.fib6_main_tbl, fl6, skb, flags);
		if (rt->dst.error != -EAGAIN)
			return &rt->dst;
		ip6_rt_put(rt);
	}

	dst_hold(&net->ipv6.ip6_null_entry->dst);
	return &net->ipv6.ip6_null_entry->dst;
}

static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
			    int flags, struct fib_lookup_arg *arg)
{
	struct flowi6 *flp6 = &flp->u.ip6;
	struct rt6_info *rt = NULL;
	struct fib6_table *table;
	struct net *net = rule->fr_net;
	pol_lookup_t lookup = arg->lookup_ptr;
	int err = 0;
	u32 tb_id;

	switch (rule->action) {
	case FR_ACT_TO_TBL:
		break;
	case FR_ACT_UNREACHABLE:
		err = -ENETUNREACH;
		rt = net->ipv6.ip6_null_entry;
		goto discard_pkt;
	default:
	case FR_ACT_BLACKHOLE:
		err = -EINVAL;
		rt = net->ipv6.ip6_blk_hole_entry;
		goto discard_pkt;
	case FR_ACT_PROHIBIT:
		err = -EACCES;
		rt = net->ipv6.ip6_prohibit_entry;
		goto discard_pkt;
	}

	tb_id = fib_rule_get_table(rule, arg);
	table = fib6_get_table(net, tb_id);
	if (!table) {
		err = -EAGAIN;
		goto out;
	}

	rt = lookup(net, table, flp6, arg->lookup_data, flags);
	if (rt != net->ipv6.ip6_null_entry) {
		struct fib6_rule *r = (struct fib6_rule *)rule;

		/*
		 * If we need to find a source address for this traffic,
		 * we check the result if it meets requirement of the rule.
		 */
		if ((rule->flags & FIB_RULE_FIND_SADDR) &&
		    r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
			struct in6_addr saddr;

			if (ipv6_dev_get_saddr(net,
					       ip6_dst_idev(&rt->dst)->dev,
					       &flp6->daddr,
					       rt6_flags2srcprefs(flags),
					       &saddr))
				goto again;
			if (!ipv6_prefix_equal(&saddr, &r->src.addr,
					       r->src.plen))
				goto again;
			flp6->saddr = saddr;
		}
		err = rt->dst.error;
		if (err != -EAGAIN)
			goto out;
	}
again:
	ip6_rt_put(rt);
	err = -EAGAIN;
	rt = NULL;
	goto out;

discard_pkt:
	dst_hold(&rt->dst);
out:
	arg->result = rt;
	return err;
}

static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
{
	struct rt6_info *rt = (struct rt6_info *) arg->result;
	struct net_device *dev = NULL;

	if (rt->rt6i_idev)
		dev = rt->rt6i_idev->dev;

	/* do not accept result if the route does
	 * not meet the required prefix length
	 */
	if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
		goto suppress_route;

	/* do not accept result if the route uses a device
	 * belonging to a forbidden interface group
	 */
	if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
		goto suppress_route;

	return false;

suppress_route:
	ip6_rt_put(rt);
	return true;
}

static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
	struct fib6_rule *r = (struct fib6_rule *) rule;
	struct flowi6 *fl6 = &fl->u.ip6;

	if (r->dst.plen &&
	    !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
		return 0;

	/*
	 * If FIB_RULE_FIND_SADDR is set and we do not have a
	 * source address for the traffic, we defer check for
	 * source address.
	 */
	if (r->src.plen) {
		if (flags & RT6_LOOKUP_F_HAS_SADDR) {
			if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
					       r->src.plen))
				return 0;
		} else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
			return 0;
	}

	if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
		return 0;

	if (rule->ip_proto && (rule->ip_proto != fl6->flowi6_proto))
		return 0;

	if (fib_rule_port_range_set(&rule->sport_range) &&
	    !fib_rule_port_inrange(&rule->sport_range, fl6->fl6_sport))
		return 0;

	if (fib_rule_port_range_set(&rule->dport_range) &&
	    !fib_rule_port_inrange(&rule->dport_range, fl6->fl6_dport))
		return 0;

	return 1;
}

static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
	FRA_GENERIC_POLICY,
};

static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
			       struct fib_rule_hdr *frh,
			       struct nlattr **tb)
{
	int err = -EINVAL;
	struct net *net = sock_net(skb->sk);
	struct fib6_rule *rule6 = (struct fib6_rule *) rule;

	if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) {
		if (rule->table == RT6_TABLE_UNSPEC)
			goto errout;

		if (fib6_new_table(net, rule->table) == NULL) {
			err = -ENOBUFS;
			goto errout;
		}
	}

	if (frh->src_len)
		rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);

	if (frh->dst_len)
		rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);

	rule6->src.plen = frh->src_len;
	rule6->dst.plen = frh->dst_len;
	rule6->tclass = frh->tos;

	if (fib_rule_requires_fldissect(rule))
		net->ipv6.fib6_rules_require_fldissect++;

	net->ipv6.fib6_has_custom_rules = true;
	err = 0;
errout:
	return err;
}

static int fib6_rule_delete(struct fib_rule *rule)
{
	struct net *net = rule->fr_net;

	if (net->ipv6.fib6_rules_require_fldissect &&
	    fib_rule_requires_fldissect(rule))
		net->ipv6.fib6_rules_require_fldissect--;

	return 0;
}

static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
			     struct nlattr **tb)
{
	struct fib6_rule *rule6 = (struct fib6_rule *) rule;

	if (frh->src_len && (rule6->src.plen != frh->src_len))
		return 0;

	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
		return 0;

	if (frh->tos && (rule6->tclass != frh->tos))
		return 0;

	if (frh->src_len &&
	    nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
		return 0;

	if (frh->dst_len &&
	    nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
		return 0;

	return 1;
}

static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
			  struct fib_rule_hdr *frh)
{
	struct fib6_rule *rule6 = (struct fib6_rule *) rule;

	frh->dst_len = rule6->dst.plen;
	frh->src_len = rule6->src.plen;
	frh->tos = rule6->tclass;

	if ((rule6->dst.plen &&
	     nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
	    (rule6->src.plen &&
	     nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -ENOBUFS;
}

static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
{
	return nla_total_size(16) /* dst */
	       + nla_total_size(16); /* src */
}

static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
	.family			= AF_INET6,
	.rule_size		= sizeof(struct fib6_rule),
	.addr_size		= sizeof(struct in6_addr),
	.action			= fib6_rule_action,
	.match			= fib6_rule_match,
	.suppress		= fib6_rule_suppress,
	.configure		= fib6_rule_configure,
	.delete			= fib6_rule_delete,
	.compare		= fib6_rule_compare,
	.fill			= fib6_rule_fill,
	.nlmsg_payload		= fib6_rule_nlmsg_payload,
	.nlgroup		= RTNLGRP_IPV6_RULE,
	.policy			= fib6_rule_policy,
	.owner			= THIS_MODULE,
	.fro_net		= &init_net,
};

static int __net_init fib6_rules_net_init(struct net *net)
{
	struct fib_rules_ops *ops;
	int err = -ENOMEM;

	ops = fib_rules_register(&fib6_rules_ops_template, net);
	if (IS_ERR(ops))
		return PTR_ERR(ops);

	err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
	if (err)
		goto out_fib6_rules_ops;

	err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
	if (err)
		goto out_fib6_rules_ops;

	net->ipv6.fib6_rules_ops = ops;
	net->ipv6.fib6_rules_require_fldissect = 0;
out:
	return err;

out_fib6_rules_ops:
	fib_rules_unregister(ops);
	goto out;
}

static void __net_exit fib6_rules_net_exit(struct net *net)
{
	rtnl_lock();
	fib_rules_unregister(net->ipv6.fib6_rules_ops);
	rtnl_unlock();
}

static struct pernet_operations fib6_rules_net_ops = {
	.init = fib6_rules_net_init,
	.exit = fib6_rules_net_exit,
};

int __init fib6_rules_init(void)
{
	return register_pernet_subsys(&fib6_rules_net_ops);
}


void fib6_rules_cleanup(void)
{
	unregister_pernet_subsys(&fib6_rules_net_ops);
}
Commit	Line	Data
101367c2 TG	1	/*
	2	* net/ipv6/fib6_rules.c IPv6 Routing Policy Rules
	3	*
	4	* Copyright (C)2003-2006 Helsinki University of Technology
	5	* Copyright (C)2003-2006 USAGI/WIDE Project
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License as
	9	* published by the Free Software Foundation, version 2.
	10	*
	11	* Authors
	12	* Thomas Graf <[email protected]>
	13	* Ville Nuorvala <[email protected]>
	14	*/
	15
101367c2	16	#include <linux/netdevice.h>
dcb18f76	17	#include <linux/notifier.h>
bc3b2d7f	18	#include <linux/export.h>
101367c2 TG	19
	20	#include <net/fib_rules.h>
	21	#include <net/ipv6.h>
29f6af77	22	#include <net/addrconf.h>
101367c2 TG	23	#include <net/ip6_route.h>
	24	#include <net/netlink.h>
	25
911c8541	26	struct fib6_rule {
101367c2 TG	27	struct fib_rule common;
	28	struct rt6key src;
	29	struct rt6key dst;
	30	u8 tclass;
	31	};
	32
e3ea9731 IS	33	static bool fib6_rule_matchall(const struct fib_rule *rule)
	34	{
	35	struct fib6_rule *r = container_of(rule, struct fib6_rule, common);
	36
	37	if (r->dst.plen \|\| r->src.plen \|\| r->tclass)
	38	return false;
	39	return fib_rule_matchall(rule);
	40	}
	41
	42	bool fib6_rule_default(const struct fib_rule *rule)
	43	{
	44	if (!fib6_rule_matchall(rule) \|\| rule->action != FR_ACT_TO_TBL \|\|
	45	rule->l3mdev)
	46	return false;
	47	if (rule->table != RT6_TABLE_LOCAL && rule->table != RT6_TABLE_MAIN)
	48	return false;
	49	return true;
	50	}
	51	EXPORT_SYMBOL_GPL(fib6_rule_default);
	52
dcb18f76 IS	53	int fib6_rules_dump(struct net net, struct notifier_block nb)
	54	{
	55	return fib_rules_dump(net, nb, AF_INET6);
	56	}
	57
	58	unsigned int fib6_rules_seq_read(struct net *net)
	59	{
	60	return fib_rules_seq_read(net, AF_INET6);
	61	}
	62
4c9483b2	63	struct dst_entry fib6_rule_lookup(struct net net, struct flowi6 *fl6,
b75cc8f9	64	const struct sk_buff *skb,
58f09b78	65	int flags, pol_lookup_t lookup)
101367c2	66	{
feca7d8c VB	67	if (net->ipv6.fib6_has_custom_rules) {
	68	struct fib_lookup_arg arg = {
	69	.lookup_ptr = lookup,
b75cc8f9	70	.lookup_data = skb,
feca7d8c VB	71	.flags = FIB_LOOKUP_NOREF,
	72	};
	73
	74	/* update flow if oif or iif point to device enslaved to l3mdev */
	75	l3mdev_update_flow(net, flowi6_to_flowi(fl6));
	76
	77	fib_rules_lookup(net->ipv6.fib6_rules_ops,
	78	flowi6_to_flowi(fl6), flags, &arg);
	79
	80	if (arg.result)
	81	return arg.result;
	82	} else {
	83	struct rt6_info *rt;
	84
b75cc8f9	85	rt = lookup(net, net->ipv6.fib6_local_tbl, fl6, skb, flags);
feca7d8c VB	86	if (rt != net->ipv6.ip6_null_entry && rt->dst.error != -EAGAIN)
	87	return &rt->dst;
	88	ip6_rt_put(rt);
b75cc8f9	89	rt = lookup(net, net->ipv6.fib6_main_tbl, fl6, skb, flags);
feca7d8c VB	90	if (rt->dst.error != -EAGAIN)
	91	return &rt->dst;
	92	ip6_rt_put(rt);
	93	}
b1429553	94
07f61557 SP	95	dst_hold(&net->ipv6.ip6_null_entry->dst);
07f61557 SP	96	return &net->ipv6.ip6_null_entry->dst;
101367c2 TG	97	}
101367c2 TG	98
8ce11e6a AB	99	static int fib6_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	100	int flags, struct fib_lookup_arg *arg)
101367c2	101	{
4c9483b2	102	struct flowi6 *flp6 = &flp->u.ip6;
101367c2 TG	103	struct rt6_info *rt = NULL;
101367c2 TG	104	struct fib6_table *table;
8ed67789	105	struct net *net = rule->fr_net;
101367c2	106	pol_lookup_t lookup = arg->lookup_ptr;
46b3a421	107	int err = 0;
96c63fa7	108	u32 tb_id;
101367c2 TG	109
	110	switch (rule->action) {
	111	case FR_ACT_TO_TBL:
	112	break;
	113	case FR_ACT_UNREACHABLE:
46b3a421	114	err = -ENETUNREACH;
8ed67789	115	rt = net->ipv6.ip6_null_entry;
101367c2 TG	116	goto discard_pkt;
	117	default:
	118	case FR_ACT_BLACKHOLE:
46b3a421	119	err = -EINVAL;
8ed67789	120	rt = net->ipv6.ip6_blk_hole_entry;
101367c2 TG	121	goto discard_pkt;
101367c2 TG	122	case FR_ACT_PROHIBIT:
46b3a421	123	err = -EACCES;
8ed67789	124	rt = net->ipv6.ip6_prohibit_entry;
101367c2 TG	125	goto discard_pkt;
	126	}
	127
96c63fa7 DA	128	tb_id = fib_rule_get_table(rule, arg);
96c63fa7 DA	129	table = fib6_get_table(net, tb_id);
46b3a421 HFS	130	if (!table) {
	131	err = -EAGAIN;
	132	goto out;
	133	}
101367c2	134
b75cc8f9	135	rt = lookup(net, table, flp6, arg->lookup_data, flags);
8ed67789	136	if (rt != net->ipv6.ip6_null_entry) {
29f6af77 YH	137	struct fib6_rule r = (struct fib6_rule )rule;
	138
	139	/*
	140	* If we need to find a source address for this traffic,
	141	* we check the result if it meets requirement of the rule.
	142	*/
	143	if ((rule->flags & FIB_RULE_FIND_SADDR) &&
	144	r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
	145	struct in6_addr saddr;
7cbca67c	146
191cd582	147	if (ipv6_dev_get_saddr(net,
d8d1f30b	148	ip6_dst_idev(&rt->dst)->dev,
4c9483b2	149	&flp6->daddr,
0c9a2ac1	150	rt6_flags2srcprefs(flags),
7cbca67c	151	&saddr))
29f6af77 YH	152	goto again;
	153	if (!ipv6_prefix_equal(&saddr, &r->src.addr,
	154	r->src.plen))
	155	goto again;
4e3fd7a0	156	flp6->saddr = saddr;
29f6af77	157	}
73ba57bf	158	err = rt->dst.error;
07f61557 SP	159	if (err != -EAGAIN)
07f61557 SP	160	goto out;
29f6af77 YH	161	}
29f6af77 YH	162	again:
94e187c0	163	ip6_rt_put(rt);
46b3a421	164	err = -EAGAIN;
3226f688 PM	165	rt = NULL;
	166	goto out;
	167
101367c2	168	discard_pkt:
d8d1f30b	169	dst_hold(&rt->dst);
101367c2 TG	170	out:
101367c2 TG	171	arg->result = rt;
46b3a421	172	return err;
101367c2 TG	173	}
101367c2 TG	174
7764a45a ST	175	static bool fib6_rule_suppress(struct fib_rule rule, struct fib_lookup_arg arg)
	176	{
	177	struct rt6_info rt = (struct rt6_info ) arg->result;
673498b8 ST	178	struct net_device *dev = NULL;
	179
	180	if (rt->rt6i_idev)
	181	dev = rt->rt6i_idev->dev;
	182
7764a45a ST	183	/* do not accept result if the route does
	184	* not meet the required prefix length
	185	*/
73f5698e	186	if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
6ef94cfa ST	187	goto suppress_route;
	188
	189	/* do not accept result if the route uses a device
	190	* belonging to a forbidden interface group
	191	*/
	192	if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
	193	goto suppress_route;
	194
	195	return false;
	196
	197	suppress_route:
04f0888d ST	198	ip6_rt_put(rt);
04f0888d ST	199	return true;
7764a45a	200	}
101367c2 TG	201
	202	static int fib6_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	203	{
	204	struct fib6_rule r = (struct fib6_rule ) rule;
4c9483b2	205	struct flowi6 *fl6 = &fl->u.ip6;
101367c2	206
adaa70bb	207	if (r->dst.plen &&
4c9483b2	208	!ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
101367c2 TG	209	return 0;
101367c2 TG	210
29f6af77 YH	211	/*
	212	* If FIB_RULE_FIND_SADDR is set and we do not have a
	213	* source address for the traffic, we defer check for
	214	* source address.
	215	*/
adaa70bb	216	if (r->src.plen) {
29f6af77	217	if (flags & RT6_LOOKUP_F_HAS_SADDR) {
4c9483b2	218	if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
29f6af77 YH	219	r->src.plen))
	220	return 0;
	221	} else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
adaa70bb TG	222	return 0;
adaa70bb TG	223	}
101367c2	224
d76ed22b	225	if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
2cc67cc7 YH	226	return 0;
2cc67cc7 YH	227
bb0ad198 RP	228	if (rule->ip_proto && (rule->ip_proto != fl6->flowi6_proto))
	229	return 0;
	230
	231	if (fib_rule_port_range_set(&rule->sport_range) &&
	232	!fib_rule_port_inrange(&rule->sport_range, fl6->fl6_sport))
	233	return 0;
	234
	235	if (fib_rule_port_range_set(&rule->dport_range) &&
	236	!fib_rule_port_inrange(&rule->dport_range, fl6->fl6_dport))
	237	return 0;
	238
101367c2 TG	239	return 1;
	240	}
	241
ef7c79ed	242	static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
1f6c9557	243	FRA_GENERIC_POLICY,
101367c2 TG	244	};
	245
	246	static int fib6_rule_configure(struct fib_rule rule, struct sk_buff skb,
8b3521ee	247	struct fib_rule_hdr *frh,
101367c2 TG	248	struct nlattr **tb)
	249	{
	250	int err = -EINVAL;
3b1e0a65	251	struct net *net = sock_net(skb->sk);
101367c2 TG	252	struct fib6_rule rule6 = (struct fib6_rule ) rule;
101367c2 TG	253
96c63fa7	254	if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) {
101367c2 TG	255	if (rule->table == RT6_TABLE_UNSPEC)
	256	goto errout;
	257
dcabb819	258	if (fib6_new_table(net, rule->table) == NULL) {
101367c2 TG	259	err = -ENOBUFS;
	260	goto errout;
	261	}
	262	}
	263
e1701c68	264	if (frh->src_len)
67b61f6c	265	rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);
101367c2	266
e1701c68	267	if (frh->dst_len)
67b61f6c	268	rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);
101367c2 TG	269
	270	rule6->src.plen = frh->src_len;
	271	rule6->dst.plen = frh->dst_len;
	272	rule6->tclass = frh->tos;
	273
5e5d6fed RP	274	if (fib_rule_requires_fldissect(rule))
	275	net->ipv6.fib6_rules_require_fldissect++;
	276
feca7d8c	277	net->ipv6.fib6_has_custom_rules = true;
101367c2 TG	278	err = 0;
	279	errout:
	280	return err;
	281	}
	282
5e5d6fed RP	283	static int fib6_rule_delete(struct fib_rule *rule)
	284	{
	285	struct net *net = rule->fr_net;
	286
	287	if (net->ipv6.fib6_rules_require_fldissect &&
	288	fib_rule_requires_fldissect(rule))
	289	net->ipv6.fib6_rules_require_fldissect--;
	290
	291	return 0;
	292	}
	293
101367c2 TG	294	static int fib6_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
	295	struct nlattr **tb)
	296	{
	297	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	298
	299	if (frh->src_len && (rule6->src.plen != frh->src_len))
	300	return 0;
	301
	302	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
	303	return 0;
	304
	305	if (frh->tos && (rule6->tclass != frh->tos))
	306	return 0;
	307
e1701c68	308	if (frh->src_len &&
101367c2 TG	309	nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
	310	return 0;
	311
e1701c68	312	if (frh->dst_len &&
101367c2 TG	313	nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
	314	return 0;
	315
	316	return 1;
	317	}
	318
	319	static int fib6_rule_fill(struct fib_rule rule, struct sk_buff skb,
04af8cf6	320	struct fib_rule_hdr *frh)
101367c2 TG	321	{
	322	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	323
101367c2 TG	324	frh->dst_len = rule6->dst.plen;
	325	frh->src_len = rule6->src.plen;
	326	frh->tos = rule6->tclass;
	327
c78679e8	328	if ((rule6->dst.plen &&
930345ea	329	nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) \|\|
c78679e8	330	(rule6->src.plen &&
930345ea	331	nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
c78679e8	332	goto nla_put_failure;
101367c2 TG	333	return 0;
	334
	335	nla_put_failure:
	336	return -ENOBUFS;
	337	}
	338
339bf98f TG	339	static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
	340	{
	341	return nla_total_size(16) /* dst */
	342	+ nla_total_size(16); /* src */
	343	}
	344
04a6f82c	345	static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
25239cee	346	.family = AF_INET6,
101367c2	347	.rule_size = sizeof(struct fib6_rule),
e1701c68	348	.addr_size = sizeof(struct in6_addr),
101367c2 TG	349	.action = fib6_rule_action,
101367c2 TG	350	.match = fib6_rule_match,
7764a45a	351	.suppress = fib6_rule_suppress,
101367c2	352	.configure = fib6_rule_configure,
5e5d6fed	353	.delete = fib6_rule_delete,
101367c2 TG	354	.compare = fib6_rule_compare,
101367c2 TG	355	.fill = fib6_rule_fill,
339bf98f	356	.nlmsg_payload = fib6_rule_nlmsg_payload,
101367c2 TG	357	.nlgroup = RTNLGRP_IPV6_RULE,
101367c2 TG	358	.policy = fib6_rule_policy,
101367c2	359	.owner = THIS_MODULE,
03592383	360	.fro_net = &init_net,
101367c2 TG	361	};
101367c2 TG	362
2c8c1e72	363	static int __net_init fib6_rules_net_init(struct net *net)
101367c2	364	{
e9c5158a	365	struct fib_rules_ops *ops;
dcabb819	366	int err = -ENOMEM;
2994c638	367
e9c5158a EB	368	ops = fib_rules_register(&fib6_rules_ops_template, net);
	369	if (IS_ERR(ops))
	370	return PTR_ERR(ops);
eb5564b8	371
85b99092	372	err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
dcabb819 DL	373	if (err)
dcabb819 DL	374	goto out_fib6_rules_ops;
9eb87f3f	375
85b99092	376	err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
dcabb819	377	if (err)
e9c5158a	378	goto out_fib6_rules_ops;
9eb87f3f	379
85b99092	380	net->ipv6.fib6_rules_ops = ops;
5e5d6fed	381	net->ipv6.fib6_rules_require_fldissect = 0;
9eb87f3f	382	out:
dcabb819	383	return err;
9eb87f3f	384
dcabb819	385	out_fib6_rules_ops:
e9c5158a	386	fib_rules_unregister(ops);
9eb87f3f	387	goto out;
101367c2 TG	388	}
101367c2 TG	389
2c8c1e72	390	static void __net_exit fib6_rules_net_exit(struct net *net)
dcabb819	391	{
419df12f	392	rtnl_lock();
dcabb819	393	fib_rules_unregister(net->ipv6.fib6_rules_ops);
419df12f	394	rtnl_unlock();
dcabb819 DL	395	}
	396
	397	static struct pernet_operations fib6_rules_net_ops = {
	398	.init = fib6_rules_net_init,
	399	.exit = fib6_rules_net_exit,
	400	};
	401
	402	int __init fib6_rules_init(void)
	403	{
	404	return register_pernet_subsys(&fib6_rules_net_ops);
	405	}
	406
	407
101367c2 TG	408	void fib6_rules_cleanup(void)
101367c2 TG	409	{
ff4e1fb0	410	unregister_pernet_subsys(&fib6_rules_net_ops);
101367c2	411	}