[mirror_ubuntu-bionic-kernel.git] / net / ipv4 / fib_rules.c

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		IPv4 Forwarding Information Base: policy rules.
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *		Thomas Graf <tgraf@suug.ch>
 *
 *		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; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Fixes:
 *		Rani Assaf	:	local_rule cannot be deleted
 *		Marc Boucher	:	routing by fwmark
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/export.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/ip_fib.h>
#include <net/fib_rules.h>

struct fib4_rule {
	struct fib_rule		common;
	u8			dst_len;
	u8			src_len;
	u8			tos;
	__be32			src;
	__be32			srcmask;
	__be32			dst;
	__be32			dstmask;
#ifdef CONFIG_IP_ROUTE_CLASSID
	u32			tclassid;
#endif
};

int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
{
	struct fib_lookup_arg arg = {
		.result = res,
		.flags = FIB_LOOKUP_NOREF,
	};
	int err;

	err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg);
#ifdef CONFIG_IP_ROUTE_CLASSID
	if (arg.rule)
		res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid;
	else
		res->tclassid = 0;
#endif
	return err;
}
EXPORT_SYMBOL_GPL(__fib_lookup);

static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
			    int flags, struct fib_lookup_arg *arg)
{
	int err = -EAGAIN;
	struct fib_table *tbl;

	switch (rule->action) {
	case FR_ACT_TO_TBL:
		break;

	case FR_ACT_UNREACHABLE:
		err = -ENETUNREACH;
		goto errout;

	case FR_ACT_PROHIBIT:
		err = -EACCES;
		goto errout;

	case FR_ACT_BLACKHOLE:
	default:
		err = -EINVAL;
		goto errout;
	}

	tbl = fib_get_table(rule->fr_net, rule->table);
	if (!tbl)
		goto errout;

	err = fib_table_lookup(tbl, &flp->u.ip4, (struct fib_result *) arg->result, arg->flags);
	if (err > 0)
		err = -EAGAIN;
errout:
	return err;
}

static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
{
	struct fib_result *result = (struct fib_result *) arg->result;
	struct net_device *dev = NULL;

	if (result->fi)
		dev = result->fi->fib_dev;

	/* do not accept result if the route does
	 * not meet the required prefix length
	 */
	if (result->prefixlen <= 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:
	if (!(arg->flags & FIB_LOOKUP_NOREF))
		fib_info_put(result->fi);
	return true;
}

static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
	struct fib4_rule *r = (struct fib4_rule *) rule;
	struct flowi4 *fl4 = &fl->u.ip4;
	__be32 daddr = fl4->daddr;
	__be32 saddr = fl4->saddr;

	if (((saddr ^ r->src) & r->srcmask) ||
	    ((daddr ^ r->dst) & r->dstmask))
		return 0;

	if (r->tos && (r->tos != fl4->flowi4_tos))
		return 0;

	return 1;
}

static struct fib_table *fib_empty_table(struct net *net)
{
	u32 id;

	for (id = 1; id <= RT_TABLE_MAX; id++)
		if (fib_get_table(net, id) == NULL)
			return fib_new_table(net, id);
	return NULL;
}

static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
	FRA_GENERIC_POLICY,
	[FRA_FLOW]	= { .type = NLA_U32 },
};

static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
			       struct fib_rule_hdr *frh,
			       struct nlattr **tb)
{
	struct net *net = sock_net(skb->sk);
	int err = -EINVAL;
	struct fib4_rule *rule4 = (struct fib4_rule *) rule;

	if (frh->tos & ~IPTOS_TOS_MASK)
		goto errout;

	if (rule->table == RT_TABLE_UNSPEC) {
		if (rule->action == FR_ACT_TO_TBL) {
			struct fib_table *table;

			table = fib_empty_table(net);
			if (table == NULL) {
				err = -ENOBUFS;
				goto errout;
			}

			rule->table = table->tb_id;
		}
	}

	if (frh->src_len)
		rule4->src = nla_get_be32(tb[FRA_SRC]);

	if (frh->dst_len)
		rule4->dst = nla_get_be32(tb[FRA_DST]);

#ifdef CONFIG_IP_ROUTE_CLASSID
	if (tb[FRA_FLOW]) {
		rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
		if (rule4->tclassid)
			net->ipv4.fib_num_tclassid_users++;
	}
#endif

	rule4->src_len = frh->src_len;
	rule4->srcmask = inet_make_mask(rule4->src_len);
	rule4->dst_len = frh->dst_len;
	rule4->dstmask = inet_make_mask(rule4->dst_len);
	rule4->tos = frh->tos;

	net->ipv4.fib_has_custom_rules = true;
	err = 0;
errout:
	return err;
}

static void fib4_rule_delete(struct fib_rule *rule)
{
	struct net *net = rule->fr_net;
#ifdef CONFIG_IP_ROUTE_CLASSID
	struct fib4_rule *rule4 = (struct fib4_rule *) rule;

	if (rule4->tclassid)
		net->ipv4.fib_num_tclassid_users--;
#endif
	net->ipv4.fib_has_custom_rules = true;
}

static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
			     struct nlattr **tb)
{
	struct fib4_rule *rule4 = (struct fib4_rule *) rule;

	if (frh->src_len && (rule4->src_len != frh->src_len))
		return 0;

	if (frh->dst_len && (rule4->dst_len != frh->dst_len))
		return 0;

	if (frh->tos && (rule4->tos != frh->tos))
		return 0;

#ifdef CONFIG_IP_ROUTE_CLASSID
	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
		return 0;
#endif

	if (frh->src_len && (rule4->src != nla_get_be32(tb[FRA_SRC])))
		return 0;

	if (frh->dst_len && (rule4->dst != nla_get_be32(tb[FRA_DST])))
		return 0;

	return 1;
}

static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
			  struct fib_rule_hdr *frh)
{
	struct fib4_rule *rule4 = (struct fib4_rule *) rule;

	frh->dst_len = rule4->dst_len;
	frh->src_len = rule4->src_len;
	frh->tos = rule4->tos;

	if ((rule4->dst_len &&
	     nla_put_be32(skb, FRA_DST, rule4->dst)) ||
	    (rule4->src_len &&
	     nla_put_be32(skb, FRA_SRC, rule4->src)))
		goto nla_put_failure;
#ifdef CONFIG_IP_ROUTE_CLASSID
	if (rule4->tclassid &&
	    nla_put_u32(skb, FRA_FLOW, rule4->tclassid))
		goto nla_put_failure;
#endif
	return 0;

nla_put_failure:
	return -ENOBUFS;
}

static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
{
	return nla_total_size(4) /* dst */
	       + nla_total_size(4) /* src */
	       + nla_total_size(4); /* flow */
}

static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
{
	rt_cache_flush(ops->fro_net);
}

static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
	.family		= AF_INET,
	.rule_size	= sizeof(struct fib4_rule),
	.addr_size	= sizeof(u32),
	.action		= fib4_rule_action,
	.suppress	= fib4_rule_suppress,
	.match		= fib4_rule_match,
	.configure	= fib4_rule_configure,
	.delete		= fib4_rule_delete,
	.compare	= fib4_rule_compare,
	.fill		= fib4_rule_fill,
	.default_pref	= fib_default_rule_pref,
	.nlmsg_payload	= fib4_rule_nlmsg_payload,
	.flush_cache	= fib4_rule_flush_cache,
	.nlgroup	= RTNLGRP_IPV4_RULE,
	.policy		= fib4_rule_policy,
	.owner		= THIS_MODULE,
};

static int fib_default_rules_init(struct fib_rules_ops *ops)
{
	int err;

	err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
	if (err < 0)
		return err;
	err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
	if (err < 0)
		return err;
	err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
	if (err < 0)
		return err;
	return 0;
}

int __net_init fib4_rules_init(struct net *net)
{
	int err;
	struct fib_rules_ops *ops;

	ops = fib_rules_register(&fib4_rules_ops_template, net);
	if (IS_ERR(ops))
		return PTR_ERR(ops);

	err = fib_default_rules_init(ops);
	if (err < 0)
		goto fail;
	net->ipv4.rules_ops = ops;
	net->ipv4.fib_has_custom_rules = false;
	return 0;

fail:
	/* also cleans all rules already added */
	fib_rules_unregister(ops);
	return err;
}

void __net_exit fib4_rules_exit(struct net *net)
{
	fib_rules_unregister(net->ipv4.rules_ops);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* IPv4 Forwarding Information Base: policy rules.
	7	*
1da177e4	8	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6a31d2a9	9	* Thomas Graf <tgraf@suug.ch>
1da177e4 LT	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version
	14	* 2 of the License, or (at your option) any later version.
	15	*
	16	* Fixes:
6a31d2a9	17	* Rani Assaf : local_rule cannot be deleted
1da177e4 LT	18	* Marc Boucher : routing by fwmark
	19	*/
	20
1da177e4 LT	21	#include <linux/types.h>
1da177e4 LT	22	#include <linux/kernel.h>
1da177e4	23	#include <linux/netdevice.h>
1da177e4	24	#include <linux/netlink.h>
e1ef4bf2	25	#include <linux/inetdevice.h>
1da177e4	26	#include <linux/init.h>
7b204afd RO	27	#include <linux/list.h>
7b204afd RO	28	#include <linux/rcupdate.h>
bc3b2d7f	29	#include <linux/export.h>
1da177e4	30	#include <net/ip.h>
1da177e4 LT	31	#include <net/route.h>
1da177e4 LT	32	#include <net/tcp.h>
1da177e4	33	#include <net/ip_fib.h>
e1ef4bf2	34	#include <net/fib_rules.h>
1da177e4	35
6a31d2a9	36	struct fib4_rule {
e1ef4bf2 TG	37	struct fib_rule common;
	38	u8 dst_len;
	39	u8 src_len;
	40	u8 tos;
81f7bf6c AV	41	__be32 src;
	42	__be32 srcmask;
	43	__be32 dst;
	44	__be32 dstmask;
c7066f70	45	#ifdef CONFIG_IP_ROUTE_CLASSID
e1ef4bf2	46	u32 tclassid;
1da177e4	47	#endif
1da177e4 LT	48	};
1da177e4 LT	49
f4530fa5	50	int __fib_lookup(struct net net, struct flowi4 flp, struct fib_result *res)
e1ef4bf2 TG	51	{
	52	struct fib_lookup_arg arg = {
	53	.result = res,
ebc0ffae	54	.flags = FIB_LOOKUP_NOREF,
e1ef4bf2 TG	55	};
e1ef4bf2 TG	56	int err;
1da177e4	57
22bd5b9b	58	err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg);
85b91b03 DM	59	#ifdef CONFIG_IP_ROUTE_CLASSID
	60	if (arg.rule)
	61	res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid;
	62	else
	63	res->tclassid = 0;
	64	#endif
e1ef4bf2 TG	65	return err;
e1ef4bf2 TG	66	}
f4530fa5	67	EXPORT_SYMBOL_GPL(__fib_lookup);
e1ef4bf2	68
8ce11e6a AB	69	static int fib4_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	70	int flags, struct fib_lookup_arg *arg)
1da177e4	71	{
e1ef4bf2 TG	72	int err = -EAGAIN;
	73	struct fib_table *tbl;
	74
	75	switch (rule->action) {
	76	case FR_ACT_TO_TBL:
	77	break;
	78
	79	case FR_ACT_UNREACHABLE:
	80	err = -ENETUNREACH;
	81	goto errout;
	82
	83	case FR_ACT_PROHIBIT:
	84	err = -EACCES;
	85	goto errout;
	86
	87	case FR_ACT_BLACKHOLE:
	88	default:
	89	err = -EINVAL;
	90	goto errout;
1da177e4	91	}
e1ef4bf2	92
6a31d2a9 ED	93	tbl = fib_get_table(rule->fr_net, rule->table);
6a31d2a9 ED	94	if (!tbl)
e1ef4bf2 TG	95	goto errout;
e1ef4bf2 TG	96
22bd5b9b	97	err = fib_table_lookup(tbl, &flp->u.ip4, (struct fib_result *) arg->result, arg->flags);
e1ef4bf2 TG	98	if (err > 0)
	99	err = -EAGAIN;
	100	errout:
1da177e4 LT	101	return err;
	102	}
	103
7764a45a ST	104	static bool fib4_rule_suppress(struct fib_rule rule, struct fib_lookup_arg arg)
7764a45a ST	105	{
6ef94cfa	106	struct fib_result result = (struct fib_result ) arg->result;
673498b8 ST	107	struct net_device *dev = NULL;
	108
	109	if (result->fi)
	110	dev = result->fi->fib_dev;
6ef94cfa	111
7764a45a ST	112	/* do not accept result if the route does
	113	* not meet the required prefix length
	114	*/
73f5698e	115	if (result->prefixlen <= rule->suppress_prefixlen)
6ef94cfa ST	116	goto suppress_route;
	117
	118	/* do not accept result if the route uses a device
	119	* belonging to a forbidden interface group
	120	*/
	121	if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
	122	goto suppress_route;
	123
7764a45a	124	return false;
6ef94cfa ST	125
	126	suppress_route:
	127	if (!(arg->flags & FIB_LOOKUP_NOREF))
	128	fib_info_put(result->fi);
	129	return true;
7764a45a	130	}
e1ef4bf2	131
e1ef4bf2 TG	132	static int fib4_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	133	{
	134	struct fib4_rule r = (struct fib4_rule ) rule;
9ade2286 DM	135	struct flowi4 *fl4 = &fl->u.ip4;
	136	__be32 daddr = fl4->daddr;
	137	__be32 saddr = fl4->saddr;
e1ef4bf2 TG	138
	139	if (((saddr ^ r->src) & r->srcmask) \|\|
	140	((daddr ^ r->dst) & r->dstmask))
	141	return 0;
	142
9ade2286	143	if (r->tos && (r->tos != fl4->flowi4_tos))
e1ef4bf2 TG	144	return 0;
e1ef4bf2 TG	145
e1ef4bf2 TG	146	return 1;
e1ef4bf2 TG	147	}
1da177e4	148
8ad4942c	149	static struct fib_table fib_empty_table(struct net net)
1da177e4	150	{
2dfe55b4	151	u32 id;
1da177e4 LT	152
1da177e4 LT	153	for (id = 1; id <= RT_TABLE_MAX; id++)
8ad4942c DL	154	if (fib_get_table(net, id) == NULL)
8ad4942c DL	155	return fib_new_table(net, id);
1da177e4 LT	156	return NULL;
	157	}
	158
ef7c79ed	159	static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
1f6c9557	160	FRA_GENERIC_POLICY,
e1ef4bf2 TG	161	[FRA_FLOW] = { .type = NLA_U32 },
e1ef4bf2 TG	162	};
7b204afd	163
e1ef4bf2	164	static int fib4_rule_configure(struct fib_rule rule, struct sk_buff skb,
8b3521ee	165	struct fib_rule_hdr *frh,
e1ef4bf2	166	struct nlattr **tb)
1da177e4	167	{
3b1e0a65	168	struct net *net = sock_net(skb->sk);
e1ef4bf2 TG	169	int err = -EINVAL;
e1ef4bf2 TG	170	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	171
e1701c68	172	if (frh->tos & ~IPTOS_TOS_MASK)
e1ef4bf2	173	goto errout;
7b204afd	174
e1ef4bf2 TG	175	if (rule->table == RT_TABLE_UNSPEC) {
	176	if (rule->action == FR_ACT_TO_TBL) {
	177	struct fib_table *table;
1da177e4	178
e4e4971c	179	table = fib_empty_table(net);
e1ef4bf2 TG	180	if (table == NULL) {
	181	err = -ENOBUFS;
	182	goto errout;
	183	}
1da177e4	184
e1ef4bf2	185	rule->table = table->tb_id;
1da177e4 LT	186	}
	187	}
	188
e1701c68	189	if (frh->src_len)
45d60b9e	190	rule4->src = nla_get_be32(tb[FRA_SRC]);
7b204afd	191
e1701c68	192	if (frh->dst_len)
45d60b9e	193	rule4->dst = nla_get_be32(tb[FRA_DST]);
7b204afd	194
c7066f70	195	#ifdef CONFIG_IP_ROUTE_CLASSID
7a9bc9b8	196	if (tb[FRA_FLOW]) {
e1ef4bf2	197	rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
7a9bc9b8	198	if (rule4->tclassid)
f4530fa5	199	net->ipv4.fib_num_tclassid_users++;
7a9bc9b8	200	}
1da177e4 LT	201	#endif
1da177e4 LT	202
e1ef4bf2 TG	203	rule4->src_len = frh->src_len;
	204	rule4->srcmask = inet_make_mask(rule4->src_len);
	205	rule4->dst_len = frh->dst_len;
	206	rule4->dstmask = inet_make_mask(rule4->dst_len);
	207	rule4->tos = frh->tos;
7b204afd	208
f4530fa5	209	net->ipv4.fib_has_custom_rules = true;
e1ef4bf2 TG	210	err = 0;
	211	errout:
	212	return err;
1da177e4 LT	213	}
1da177e4 LT	214
7a9bc9b8 DM	215	static void fib4_rule_delete(struct fib_rule *rule)
7a9bc9b8 DM	216	{
f4530fa5	217	struct net *net = rule->fr_net;
7a9bc9b8 DM	218	#ifdef CONFIG_IP_ROUTE_CLASSID
	219	struct fib4_rule rule4 = (struct fib4_rule ) rule;
	220
	221	if (rule4->tclassid)
f4530fa5	222	net->ipv4.fib_num_tclassid_users--;
7a9bc9b8	223	#endif
f4530fa5	224	net->ipv4.fib_has_custom_rules = true;
7a9bc9b8 DM	225	}
7a9bc9b8 DM	226
e1ef4bf2 TG	227	static int fib4_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
e1ef4bf2 TG	228	struct nlattr **tb)
1da177e4	229	{
e1ef4bf2	230	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	231
e1ef4bf2 TG	232	if (frh->src_len && (rule4->src_len != frh->src_len))
e1ef4bf2 TG	233	return 0;
1da177e4	234
e1ef4bf2 TG	235	if (frh->dst_len && (rule4->dst_len != frh->dst_len))
e1ef4bf2 TG	236	return 0;
7b204afd	237
e1ef4bf2 TG	238	if (frh->tos && (rule4->tos != frh->tos))
e1ef4bf2 TG	239	return 0;
7b204afd	240
c7066f70	241	#ifdef CONFIG_IP_ROUTE_CLASSID
e1ef4bf2 TG	242	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
	243	return 0;
	244	#endif
1da177e4	245
e1701c68	246	if (frh->src_len && (rule4->src != nla_get_be32(tb[FRA_SRC])))
e1ef4bf2	247	return 0;
1da177e4	248
e1701c68	249	if (frh->dst_len && (rule4->dst != nla_get_be32(tb[FRA_DST])))
e1ef4bf2	250	return 0;
1da177e4	251
e1ef4bf2	252	return 1;
1da177e4 LT	253	}
1da177e4 LT	254
e1ef4bf2	255	static int fib4_rule_fill(struct fib_rule rule, struct sk_buff skb,
04af8cf6	256	struct fib_rule_hdr *frh)
e1ef4bf2 TG	257	{
e1ef4bf2 TG	258	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	259
e1ef4bf2 TG	260	frh->dst_len = rule4->dst_len;
	261	frh->src_len = rule4->src_len;
	262	frh->tos = rule4->tos;
1da177e4	263
f3756b79 DM	264	if ((rule4->dst_len &&
	265	nla_put_be32(skb, FRA_DST, rule4->dst)) \|\|
	266	(rule4->src_len &&
	267	nla_put_be32(skb, FRA_SRC, rule4->src)))
	268	goto nla_put_failure;
c7066f70	269	#ifdef CONFIG_IP_ROUTE_CLASSID
f3756b79 DM	270	if (rule4->tclassid &&
	271	nla_put_u32(skb, FRA_FLOW, rule4->tclassid))
	272	goto nla_put_failure;
1da177e4	273	#endif
e1ef4bf2	274	return 0;
1da177e4	275
e1ef4bf2 TG	276	nla_put_failure:
e1ef4bf2 TG	277	return -ENOBUFS;
1da177e4 LT	278	}
1da177e4 LT	279
339bf98f TG	280	static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
	281	{
	282	return nla_total_size(4) /* dst */
	283	+ nla_total_size(4) /* src */
	284	+ nla_total_size(4); /* flow */
	285	}
	286
ae299fc0	287	static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
73417f61	288	{
bafa6d9d	289	rt_cache_flush(ops->fro_net);
73417f61 TG	290	}
73417f61 TG	291
04a6f82c	292	static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
25239cee	293	.family = AF_INET,
e1ef4bf2	294	.rule_size = sizeof(struct fib4_rule),
e1701c68	295	.addr_size = sizeof(u32),
e1ef4bf2	296	.action = fib4_rule_action,
7764a45a	297	.suppress = fib4_rule_suppress,
e1ef4bf2 TG	298	.match = fib4_rule_match,
e1ef4bf2 TG	299	.configure = fib4_rule_configure,
7a9bc9b8	300	.delete = fib4_rule_delete,
e1ef4bf2 TG	301	.compare = fib4_rule_compare,
e1ef4bf2 TG	302	.fill = fib4_rule_fill,
d8a566be	303	.default_pref = fib_default_rule_pref,
339bf98f	304	.nlmsg_payload = fib4_rule_nlmsg_payload,
73417f61	305	.flush_cache = fib4_rule_flush_cache,
e1ef4bf2 TG	306	.nlgroup = RTNLGRP_IPV4_RULE,
e1ef4bf2 TG	307	.policy = fib4_rule_policy,
e1ef4bf2 TG	308	.owner = THIS_MODULE,
	309	};
	310
e4e4971c	311	static int fib_default_rules_init(struct fib_rules_ops *ops)
1da177e4	312	{
2994c638 DL	313	int err;
2994c638 DL	314
5adef180	315	err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
2994c638 DL	316	if (err < 0)
2994c638 DL	317	return err;
e4e4971c	318	err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
2994c638 DL	319	if (err < 0)
2994c638 DL	320	return err;
e4e4971c	321	err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
2994c638 DL	322	if (err < 0)
	323	return err;
	324	return 0;
	325	}
1da177e4	326
7b1a74fd	327	int __net_init fib4_rules_init(struct net *net)
2994c638	328	{
dbb50165	329	int err;
e4e4971c DL	330	struct fib_rules_ops *ops;
e4e4971c DL	331
e9c5158a EB	332	ops = fib_rules_register(&fib4_rules_ops_template, net);
	333	if (IS_ERR(ops))
	334	return PTR_ERR(ops);
dbb50165	335
e4e4971c	336	err = fib_default_rules_init(ops);
dbb50165 DL	337	if (err < 0)
dbb50165 DL	338	goto fail;
e4e4971c	339	net->ipv4.rules_ops = ops;
f4530fa5	340	net->ipv4.fib_has_custom_rules = false;
dbb50165 DL	341	return 0;
	342
	343	fail:
	344	/* also cleans all rules already added */
9e3a5487	345	fib_rules_unregister(ops);
dbb50165	346	return err;
1da177e4	347	}
7b1a74fd DL	348
	349	void __net_exit fib4_rules_exit(struct net *net)
	350	{
9e3a5487	351	fib_rules_unregister(net->ipv4.rules_ops);
7b1a74fd	352	}