[deliverable/linux.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

	if (err == -ESRCH)
		err = -ENETUNREACH;

	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
49dd18ba PM	65
	66	if (err == -ESRCH)
	67	err = -ENETUNREACH;
	68
e1ef4bf2 TG	69	return err;
e1ef4bf2 TG	70	}
f4530fa5	71	EXPORT_SYMBOL_GPL(__fib_lookup);
e1ef4bf2	72
8ce11e6a AB	73	static int fib4_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	74	int flags, struct fib_lookup_arg *arg)
1da177e4	75	{
e1ef4bf2 TG	76	int err = -EAGAIN;
	77	struct fib_table *tbl;
	78
	79	switch (rule->action) {
	80	case FR_ACT_TO_TBL:
	81	break;
	82
	83	case FR_ACT_UNREACHABLE:
	84	err = -ENETUNREACH;
	85	goto errout;
	86
	87	case FR_ACT_PROHIBIT:
	88	err = -EACCES;
	89	goto errout;
	90
	91	case FR_ACT_BLACKHOLE:
	92	default:
	93	err = -EINVAL;
	94	goto errout;
1da177e4	95	}
e1ef4bf2	96
6a31d2a9 ED	97	tbl = fib_get_table(rule->fr_net, rule->table);
6a31d2a9 ED	98	if (!tbl)
e1ef4bf2 TG	99	goto errout;
e1ef4bf2 TG	100
22bd5b9b	101	err = fib_table_lookup(tbl, &flp->u.ip4, (struct fib_result *) arg->result, arg->flags);
e1ef4bf2 TG	102	if (err > 0)
	103	err = -EAGAIN;
	104	errout:
1da177e4 LT	105	return err;
	106	}
	107
7764a45a ST	108	static bool fib4_rule_suppress(struct fib_rule rule, struct fib_lookup_arg arg)
7764a45a ST	109	{
6ef94cfa	110	struct fib_result result = (struct fib_result ) arg->result;
673498b8 ST	111	struct net_device *dev = NULL;
	112
	113	if (result->fi)
	114	dev = result->fi->fib_dev;
6ef94cfa	115
7764a45a ST	116	/* do not accept result if the route does
	117	* not meet the required prefix length
	118	*/
73f5698e	119	if (result->prefixlen <= rule->suppress_prefixlen)
6ef94cfa ST	120	goto suppress_route;
	121
	122	/* do not accept result if the route uses a device
	123	* belonging to a forbidden interface group
	124	*/
	125	if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
	126	goto suppress_route;
	127
7764a45a	128	return false;
6ef94cfa ST	129
	130	suppress_route:
	131	if (!(arg->flags & FIB_LOOKUP_NOREF))
	132	fib_info_put(result->fi);
	133	return true;
7764a45a	134	}
e1ef4bf2	135
e1ef4bf2 TG	136	static int fib4_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	137	{
	138	struct fib4_rule r = (struct fib4_rule ) rule;
9ade2286 DM	139	struct flowi4 *fl4 = &fl->u.ip4;
	140	__be32 daddr = fl4->daddr;
	141	__be32 saddr = fl4->saddr;
e1ef4bf2 TG	142
	143	if (((saddr ^ r->src) & r->srcmask) \|\|
	144	((daddr ^ r->dst) & r->dstmask))
	145	return 0;
	146
9ade2286	147	if (r->tos && (r->tos != fl4->flowi4_tos))
e1ef4bf2 TG	148	return 0;
e1ef4bf2 TG	149
e1ef4bf2 TG	150	return 1;
e1ef4bf2 TG	151	}
1da177e4	152
8ad4942c	153	static struct fib_table fib_empty_table(struct net net)
1da177e4	154	{
2dfe55b4	155	u32 id;
1da177e4 LT	156
1da177e4 LT	157	for (id = 1; id <= RT_TABLE_MAX; id++)
8ad4942c DL	158	if (fib_get_table(net, id) == NULL)
8ad4942c DL	159	return fib_new_table(net, id);
1da177e4 LT	160	return NULL;
	161	}
	162
ef7c79ed	163	static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
1f6c9557	164	FRA_GENERIC_POLICY,
e1ef4bf2 TG	165	[FRA_FLOW] = { .type = NLA_U32 },
e1ef4bf2 TG	166	};
7b204afd	167
e1ef4bf2	168	static int fib4_rule_configure(struct fib_rule rule, struct sk_buff skb,
8b3521ee	169	struct fib_rule_hdr *frh,
e1ef4bf2	170	struct nlattr **tb)
1da177e4	171	{
3b1e0a65	172	struct net *net = sock_net(skb->sk);
e1ef4bf2 TG	173	int err = -EINVAL;
e1ef4bf2 TG	174	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	175
e1701c68	176	if (frh->tos & ~IPTOS_TOS_MASK)
e1ef4bf2	177	goto errout;
7b204afd	178
e1ef4bf2 TG	179	if (rule->table == RT_TABLE_UNSPEC) {
	180	if (rule->action == FR_ACT_TO_TBL) {
	181	struct fib_table *table;
1da177e4	182
e4e4971c	183	table = fib_empty_table(net);
e1ef4bf2 TG	184	if (table == NULL) {
	185	err = -ENOBUFS;
	186	goto errout;
	187	}
1da177e4	188
e1ef4bf2	189	rule->table = table->tb_id;
1da177e4 LT	190	}
	191	}
	192
e1701c68	193	if (frh->src_len)
45d60b9e	194	rule4->src = nla_get_be32(tb[FRA_SRC]);
7b204afd	195
e1701c68	196	if (frh->dst_len)
45d60b9e	197	rule4->dst = nla_get_be32(tb[FRA_DST]);
7b204afd	198
c7066f70	199	#ifdef CONFIG_IP_ROUTE_CLASSID
7a9bc9b8	200	if (tb[FRA_FLOW]) {
e1ef4bf2	201	rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
7a9bc9b8	202	if (rule4->tclassid)
f4530fa5	203	net->ipv4.fib_num_tclassid_users++;
7a9bc9b8	204	}
1da177e4 LT	205	#endif
1da177e4 LT	206
e1ef4bf2 TG	207	rule4->src_len = frh->src_len;
	208	rule4->srcmask = inet_make_mask(rule4->src_len);
	209	rule4->dst_len = frh->dst_len;
	210	rule4->dstmask = inet_make_mask(rule4->dst_len);
	211	rule4->tos = frh->tos;
7b204afd	212
f4530fa5	213	net->ipv4.fib_has_custom_rules = true;
e1ef4bf2 TG	214	err = 0;
	215	errout:
	216	return err;
1da177e4 LT	217	}
1da177e4 LT	218
7a9bc9b8 DM	219	static void fib4_rule_delete(struct fib_rule *rule)
7a9bc9b8 DM	220	{
f4530fa5	221	struct net *net = rule->fr_net;
7a9bc9b8 DM	222	#ifdef CONFIG_IP_ROUTE_CLASSID
	223	struct fib4_rule rule4 = (struct fib4_rule ) rule;
	224
	225	if (rule4->tclassid)
f4530fa5	226	net->ipv4.fib_num_tclassid_users--;
7a9bc9b8	227	#endif
f4530fa5	228	net->ipv4.fib_has_custom_rules = true;
7a9bc9b8 DM	229	}
7a9bc9b8 DM	230
e1ef4bf2 TG	231	static int fib4_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
e1ef4bf2 TG	232	struct nlattr **tb)
1da177e4	233	{
e1ef4bf2	234	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	235
e1ef4bf2 TG	236	if (frh->src_len && (rule4->src_len != frh->src_len))
e1ef4bf2 TG	237	return 0;
1da177e4	238
e1ef4bf2 TG	239	if (frh->dst_len && (rule4->dst_len != frh->dst_len))
e1ef4bf2 TG	240	return 0;
7b204afd	241
e1ef4bf2 TG	242	if (frh->tos && (rule4->tos != frh->tos))
e1ef4bf2 TG	243	return 0;
7b204afd	244
c7066f70	245	#ifdef CONFIG_IP_ROUTE_CLASSID
e1ef4bf2 TG	246	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
	247	return 0;
	248	#endif
1da177e4	249
e1701c68	250	if (frh->src_len && (rule4->src != nla_get_be32(tb[FRA_SRC])))
e1ef4bf2	251	return 0;
1da177e4	252
e1701c68	253	if (frh->dst_len && (rule4->dst != nla_get_be32(tb[FRA_DST])))
e1ef4bf2	254	return 0;
1da177e4	255
e1ef4bf2	256	return 1;
1da177e4 LT	257	}
1da177e4 LT	258
e1ef4bf2	259	static int fib4_rule_fill(struct fib_rule rule, struct sk_buff skb,
04af8cf6	260	struct fib_rule_hdr *frh)
e1ef4bf2 TG	261	{
e1ef4bf2 TG	262	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	263
e1ef4bf2 TG	264	frh->dst_len = rule4->dst_len;
	265	frh->src_len = rule4->src_len;
	266	frh->tos = rule4->tos;
1da177e4	267
f3756b79 DM	268	if ((rule4->dst_len &&
	269	nla_put_be32(skb, FRA_DST, rule4->dst)) \|\|
	270	(rule4->src_len &&
	271	nla_put_be32(skb, FRA_SRC, rule4->src)))
	272	goto nla_put_failure;
c7066f70	273	#ifdef CONFIG_IP_ROUTE_CLASSID
f3756b79 DM	274	if (rule4->tclassid &&
	275	nla_put_u32(skb, FRA_FLOW, rule4->tclassid))
	276	goto nla_put_failure;
1da177e4	277	#endif
e1ef4bf2	278	return 0;
1da177e4	279
e1ef4bf2 TG	280	nla_put_failure:
e1ef4bf2 TG	281	return -ENOBUFS;
1da177e4 LT	282	}
1da177e4 LT	283
339bf98f TG	284	static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
	285	{
	286	return nla_total_size(4) /* dst */
	287	+ nla_total_size(4) /* src */
	288	+ nla_total_size(4); /* flow */
	289	}
	290
ae299fc0	291	static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
73417f61	292	{
bafa6d9d	293	rt_cache_flush(ops->fro_net);
73417f61 TG	294	}
73417f61 TG	295
04a6f82c	296	static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
25239cee	297	.family = AF_INET,
e1ef4bf2	298	.rule_size = sizeof(struct fib4_rule),
e1701c68	299	.addr_size = sizeof(u32),
e1ef4bf2	300	.action = fib4_rule_action,
7764a45a	301	.suppress = fib4_rule_suppress,
e1ef4bf2 TG	302	.match = fib4_rule_match,
e1ef4bf2 TG	303	.configure = fib4_rule_configure,
7a9bc9b8	304	.delete = fib4_rule_delete,
e1ef4bf2 TG	305	.compare = fib4_rule_compare,
e1ef4bf2 TG	306	.fill = fib4_rule_fill,
d8a566be	307	.default_pref = fib_default_rule_pref,
339bf98f	308	.nlmsg_payload = fib4_rule_nlmsg_payload,
73417f61	309	.flush_cache = fib4_rule_flush_cache,
e1ef4bf2 TG	310	.nlgroup = RTNLGRP_IPV4_RULE,
e1ef4bf2 TG	311	.policy = fib4_rule_policy,
e1ef4bf2 TG	312	.owner = THIS_MODULE,
	313	};
	314
e4e4971c	315	static int fib_default_rules_init(struct fib_rules_ops *ops)
1da177e4	316	{
2994c638 DL	317	int err;
2994c638 DL	318
5adef180	319	err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
2994c638 DL	320	if (err < 0)
2994c638 DL	321	return err;
e4e4971c	322	err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
2994c638 DL	323	if (err < 0)
2994c638 DL	324	return err;
e4e4971c	325	err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
2994c638 DL	326	if (err < 0)
	327	return err;
	328	return 0;
	329	}
1da177e4	330
7b1a74fd	331	int __net_init fib4_rules_init(struct net *net)
2994c638	332	{
dbb50165	333	int err;
e4e4971c DL	334	struct fib_rules_ops *ops;
e4e4971c DL	335
e9c5158a EB	336	ops = fib_rules_register(&fib4_rules_ops_template, net);
	337	if (IS_ERR(ops))
	338	return PTR_ERR(ops);
dbb50165	339
e4e4971c	340	err = fib_default_rules_init(ops);
dbb50165 DL	341	if (err < 0)
dbb50165 DL	342	goto fail;
e4e4971c	343	net->ipv4.rules_ops = ops;
f4530fa5	344	net->ipv4.fib_has_custom_rules = false;
dbb50165 DL	345	return 0;
	346
	347	fail:
	348	/* also cleans all rules already added */
9e3a5487	349	fib_rules_unregister(ops);
dbb50165	350	return err;
1da177e4	351	}
7b1a74fd DL	352
	353	void __net_exit fib4_rules_exit(struct net *net)
	354	{
9e3a5487	355	fib_rules_unregister(net->ipv4.rules_ops);
7b1a74fd	356	}