[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, unsigned int flags)
{
	struct fib_lookup_arg arg = {
		.result = res,
		.flags = flags,
	};
	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:
		return -ENETUNREACH;

	case FR_ACT_PROHIBIT:
		return -EACCES;

	case FR_ACT_BLACKHOLE:
	default:
		return -EINVAL;
	}

	rcu_read_lock();

	tbl = fib_get_table(rule->fr_net, rule->table);
	if (tbl)
		err = fib_table_lookup(tbl, &flp->u.ip4,
				       (struct fib_result *)arg->result,
				       arg->flags);

	rcu_read_unlock();
	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))
			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;

	/* split local/main if they are not already split */
	err = fib_unmerge(net);
	if (err)
		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) {
				err = -ENOBUFS;
				goto errout;
			}

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

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

	if (frh->dst_len)
		rule4->dst = nla_get_in_addr(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;
	fib_flush_external(rule->fr_net);

	err = 0;
errout:
	return err;
}

static int fib4_rule_delete(struct fib_rule *rule)
{
	struct net *net = rule->fr_net;
	int err;

	/* split local/main if they are not already split */
	err = fib_unmerge(net);
	if (err)
		goto errout;

#ifdef CONFIG_IP_ROUTE_CLASSID
	if (((struct fib4_rule *)rule)->tclassid)
		net->ipv4.fib_num_tclassid_users--;
#endif
	net->ipv4.fib_has_custom_rules = true;
	fib_flush_external(rule->fr_net);
errout:
	return err;
}

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_in_addr(tb[FRA_SRC])))
		return 0;

	if (frh->dst_len && (rule4->dst != nla_get_in_addr(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_in_addr(skb, FRA_DST, rule4->dst)) ||
	    (rule4->src_len &&
	     nla_put_in_addr(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,
	.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
0eeb075f AG	50	int __fib_lookup(struct net net, struct flowi4 flp,
0eeb075f AG	51	struct fib_result *res, unsigned int flags)
e1ef4bf2 TG	52	{
	53	struct fib_lookup_arg arg = {
	54	.result = res,
0eeb075f	55	.flags = flags,
e1ef4bf2 TG	56	};
e1ef4bf2 TG	57	int err;
1da177e4	58
22bd5b9b	59	err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg);
85b91b03 DM	60	#ifdef CONFIG_IP_ROUTE_CLASSID
	61	if (arg.rule)
	62	res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid;
	63	else
	64	res->tclassid = 0;
	65	#endif
49dd18ba PM	66
	67	if (err == -ESRCH)
	68	err = -ENETUNREACH;
	69
e1ef4bf2 TG	70	return err;
e1ef4bf2 TG	71	}
f4530fa5	72	EXPORT_SYMBOL_GPL(__fib_lookup);
e1ef4bf2	73
8ce11e6a AB	74	static int fib4_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	75	int flags, struct fib_lookup_arg *arg)
1da177e4	76	{
e1ef4bf2 TG	77	int err = -EAGAIN;
	78	struct fib_table *tbl;
	79
	80	switch (rule->action) {
	81	case FR_ACT_TO_TBL:
	82	break;
	83
	84	case FR_ACT_UNREACHABLE:
345e9b54	85	return -ENETUNREACH;
e1ef4bf2 TG	86
e1ef4bf2 TG	87	case FR_ACT_PROHIBIT:
345e9b54	88	return -EACCES;
e1ef4bf2 TG	89
	90	case FR_ACT_BLACKHOLE:
	91	default:
345e9b54	92	return -EINVAL;
1da177e4	93	}
e1ef4bf2	94
345e9b54 AD	95	rcu_read_lock();
345e9b54 AD	96
6a31d2a9	97	tbl = fib_get_table(rule->fr_net, rule->table);
345e9b54 AD	98	if (tbl)
	99	err = fib_table_lookup(tbl, &flp->u.ip4,
	100	(struct fib_result *)arg->result,
	101	arg->flags);
e1ef4bf2	102
345e9b54	103	rcu_read_unlock();
1da177e4 LT	104	return err;
	105	}
	106
7764a45a ST	107	static bool fib4_rule_suppress(struct fib_rule rule, struct fib_lookup_arg arg)
7764a45a ST	108	{
6ef94cfa	109	struct fib_result result = (struct fib_result ) arg->result;
673498b8 ST	110	struct net_device *dev = NULL;
	111
	112	if (result->fi)
	113	dev = result->fi->fib_dev;
6ef94cfa	114
7764a45a ST	115	/* do not accept result if the route does
	116	* not meet the required prefix length
	117	*/
73f5698e	118	if (result->prefixlen <= rule->suppress_prefixlen)
6ef94cfa ST	119	goto suppress_route;
	120
	121	/* do not accept result if the route uses a device
	122	* belonging to a forbidden interface group
	123	*/
	124	if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
	125	goto suppress_route;
	126
7764a45a	127	return false;
6ef94cfa ST	128
	129	suppress_route:
	130	if (!(arg->flags & FIB_LOOKUP_NOREF))
	131	fib_info_put(result->fi);
	132	return true;
7764a45a	133	}
e1ef4bf2	134
e1ef4bf2 TG	135	static int fib4_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	136	{
	137	struct fib4_rule r = (struct fib4_rule ) rule;
9ade2286 DM	138	struct flowi4 *fl4 = &fl->u.ip4;
	139	__be32 daddr = fl4->daddr;
	140	__be32 saddr = fl4->saddr;
e1ef4bf2 TG	141
	142	if (((saddr ^ r->src) & r->srcmask) \|\|
	143	((daddr ^ r->dst) & r->dstmask))
	144	return 0;
	145
9ade2286	146	if (r->tos && (r->tos != fl4->flowi4_tos))
e1ef4bf2 TG	147	return 0;
e1ef4bf2 TG	148
e1ef4bf2 TG	149	return 1;
e1ef4bf2 TG	150	}
1da177e4	151
8ad4942c	152	static struct fib_table fib_empty_table(struct net net)
1da177e4	153	{
2dfe55b4	154	u32 id;
1da177e4 LT	155
1da177e4 LT	156	for (id = 1; id <= RT_TABLE_MAX; id++)
51456b29	157	if (!fib_get_table(net, id))
8ad4942c	158	return fib_new_table(net, id);
1da177e4 LT	159	return NULL;
	160	}
	161
ef7c79ed	162	static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
1f6c9557	163	FRA_GENERIC_POLICY,
e1ef4bf2 TG	164	[FRA_FLOW] = { .type = NLA_U32 },
e1ef4bf2 TG	165	};
7b204afd	166
e1ef4bf2	167	static int fib4_rule_configure(struct fib_rule rule, struct sk_buff skb,
8b3521ee	168	struct fib_rule_hdr *frh,
e1ef4bf2	169	struct nlattr **tb)
1da177e4	170	{
3b1e0a65	171	struct net *net = sock_net(skb->sk);
e1ef4bf2 TG	172	int err = -EINVAL;
e1ef4bf2 TG	173	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	174
e1701c68	175	if (frh->tos & ~IPTOS_TOS_MASK)
e1ef4bf2	176	goto errout;
7b204afd	177
0ddcf43d AD	178	/* split local/main if they are not already split */
	179	err = fib_unmerge(net);
	180	if (err)
	181	goto errout;
	182
e1ef4bf2 TG	183	if (rule->table == RT_TABLE_UNSPEC) {
	184	if (rule->action == FR_ACT_TO_TBL) {
	185	struct fib_table *table;
1da177e4	186
e4e4971c	187	table = fib_empty_table(net);
51456b29	188	if (!table) {
e1ef4bf2 TG	189	err = -ENOBUFS;
	190	goto errout;
	191	}
1da177e4	192
e1ef4bf2	193	rule->table = table->tb_id;
1da177e4 LT	194	}
	195	}
	196
e1701c68	197	if (frh->src_len)
67b61f6c	198	rule4->src = nla_get_in_addr(tb[FRA_SRC]);
7b204afd	199
e1701c68	200	if (frh->dst_len)
67b61f6c	201	rule4->dst = nla_get_in_addr(tb[FRA_DST]);
7b204afd	202
c7066f70	203	#ifdef CONFIG_IP_ROUTE_CLASSID
7a9bc9b8	204	if (tb[FRA_FLOW]) {
e1ef4bf2	205	rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
7a9bc9b8	206	if (rule4->tclassid)
f4530fa5	207	net->ipv4.fib_num_tclassid_users++;
7a9bc9b8	208	}
1da177e4 LT	209	#endif
1da177e4 LT	210
e1ef4bf2 TG	211	rule4->src_len = frh->src_len;
	212	rule4->srcmask = inet_make_mask(rule4->src_len);
	213	rule4->dst_len = frh->dst_len;
	214	rule4->dstmask = inet_make_mask(rule4->dst_len);
	215	rule4->tos = frh->tos;
7b204afd	216
f4530fa5	217	net->ipv4.fib_has_custom_rules = true;
104616e7 SF	218	fib_flush_external(rule->fr_net);
104616e7 SF	219
e1ef4bf2 TG	220	err = 0;
	221	errout:
	222	return err;
1da177e4 LT	223	}
1da177e4 LT	224
0ddcf43d	225	static int fib4_rule_delete(struct fib_rule *rule)
7a9bc9b8	226	{
f4530fa5	227	struct net *net = rule->fr_net;
0ddcf43d	228	int err;
7a9bc9b8	229
0ddcf43d AD	230	/* split local/main if they are not already split */
	231	err = fib_unmerge(net);
	232	if (err)
	233	goto errout;
	234
	235	#ifdef CONFIG_IP_ROUTE_CLASSID
	236	if (((struct fib4_rule *)rule)->tclassid)
f4530fa5	237	net->ipv4.fib_num_tclassid_users--;
7a9bc9b8	238	#endif
f4530fa5	239	net->ipv4.fib_has_custom_rules = true;
104616e7	240	fib_flush_external(rule->fr_net);
0ddcf43d AD	241	errout:
0ddcf43d AD	242	return err;
7a9bc9b8 DM	243	}
7a9bc9b8 DM	244
e1ef4bf2 TG	245	static int fib4_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
e1ef4bf2 TG	246	struct nlattr **tb)
1da177e4	247	{
e1ef4bf2	248	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	249
e1ef4bf2 TG	250	if (frh->src_len && (rule4->src_len != frh->src_len))
e1ef4bf2 TG	251	return 0;
1da177e4	252
e1ef4bf2 TG	253	if (frh->dst_len && (rule4->dst_len != frh->dst_len))
e1ef4bf2 TG	254	return 0;
7b204afd	255
e1ef4bf2 TG	256	if (frh->tos && (rule4->tos != frh->tos))
e1ef4bf2 TG	257	return 0;
7b204afd	258
c7066f70	259	#ifdef CONFIG_IP_ROUTE_CLASSID
e1ef4bf2 TG	260	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
	261	return 0;
	262	#endif
1da177e4	263
67b61f6c	264	if (frh->src_len && (rule4->src != nla_get_in_addr(tb[FRA_SRC])))
e1ef4bf2	265	return 0;
1da177e4	266
67b61f6c	267	if (frh->dst_len && (rule4->dst != nla_get_in_addr(tb[FRA_DST])))
e1ef4bf2	268	return 0;
1da177e4	269
e1ef4bf2	270	return 1;
1da177e4 LT	271	}
1da177e4 LT	272
e1ef4bf2	273	static int fib4_rule_fill(struct fib_rule rule, struct sk_buff skb,
04af8cf6	274	struct fib_rule_hdr *frh)
e1ef4bf2 TG	275	{
e1ef4bf2 TG	276	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	277
e1ef4bf2 TG	278	frh->dst_len = rule4->dst_len;
	279	frh->src_len = rule4->src_len;
	280	frh->tos = rule4->tos;
1da177e4	281
f3756b79	282	if ((rule4->dst_len &&
930345ea	283	nla_put_in_addr(skb, FRA_DST, rule4->dst)) \|\|
f3756b79	284	(rule4->src_len &&
930345ea	285	nla_put_in_addr(skb, FRA_SRC, rule4->src)))
f3756b79	286	goto nla_put_failure;
c7066f70	287	#ifdef CONFIG_IP_ROUTE_CLASSID
f3756b79 DM	288	if (rule4->tclassid &&
	289	nla_put_u32(skb, FRA_FLOW, rule4->tclassid))
	290	goto nla_put_failure;
1da177e4	291	#endif
e1ef4bf2	292	return 0;
1da177e4	293
e1ef4bf2 TG	294	nla_put_failure:
e1ef4bf2 TG	295	return -ENOBUFS;
1da177e4 LT	296	}
1da177e4 LT	297
339bf98f TG	298	static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
	299	{
	300	return nla_total_size(4) /* dst */
	301	+ nla_total_size(4) /* src */
	302	+ nla_total_size(4); /* flow */
	303	}
	304
ae299fc0	305	static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
73417f61	306	{
bafa6d9d	307	rt_cache_flush(ops->fro_net);
73417f61 TG	308	}
73417f61 TG	309
04a6f82c	310	static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
25239cee	311	.family = AF_INET,
e1ef4bf2	312	.rule_size = sizeof(struct fib4_rule),
e1701c68	313	.addr_size = sizeof(u32),
e1ef4bf2	314	.action = fib4_rule_action,
7764a45a	315	.suppress = fib4_rule_suppress,
e1ef4bf2 TG	316	.match = fib4_rule_match,
e1ef4bf2 TG	317	.configure = fib4_rule_configure,
7a9bc9b8	318	.delete = fib4_rule_delete,
e1ef4bf2 TG	319	.compare = fib4_rule_compare,
e1ef4bf2 TG	320	.fill = fib4_rule_fill,
339bf98f	321	.nlmsg_payload = fib4_rule_nlmsg_payload,
73417f61	322	.flush_cache = fib4_rule_flush_cache,
e1ef4bf2 TG	323	.nlgroup = RTNLGRP_IPV4_RULE,
e1ef4bf2 TG	324	.policy = fib4_rule_policy,
e1ef4bf2 TG	325	.owner = THIS_MODULE,
	326	};
	327
e4e4971c	328	static int fib_default_rules_init(struct fib_rules_ops *ops)
1da177e4	329	{
2994c638 DL	330	int err;
2994c638 DL	331
5adef180	332	err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
2994c638 DL	333	if (err < 0)
2994c638 DL	334	return err;
e4e4971c	335	err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
2994c638 DL	336	if (err < 0)
2994c638 DL	337	return err;
e4e4971c	338	err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
2994c638 DL	339	if (err < 0)
	340	return err;
	341	return 0;
	342	}
1da177e4	343
7b1a74fd	344	int __net_init fib4_rules_init(struct net *net)
2994c638	345	{
dbb50165	346	int err;
e4e4971c DL	347	struct fib_rules_ops *ops;
e4e4971c DL	348
e9c5158a EB	349	ops = fib_rules_register(&fib4_rules_ops_template, net);
	350	if (IS_ERR(ops))
	351	return PTR_ERR(ops);
dbb50165	352
e4e4971c	353	err = fib_default_rules_init(ops);
dbb50165 DL	354	if (err < 0)
dbb50165 DL	355	goto fail;
e4e4971c	356	net->ipv4.rules_ops = ops;
f4530fa5	357	net->ipv4.fib_has_custom_rules = false;
dbb50165 DL	358	return 0;
	359
	360	fail:
	361	/* also cleans all rules already added */
9e3a5487	362	fib_rules_unregister(ops);
dbb50165	363	return err;
1da177e4	364	}
7b1a74fd DL	365
	366	void __net_exit fib4_rules_exit(struct net *net)
	367	{
9e3a5487	368	fib_rules_unregister(net->ipv4.rules_ops);
7b1a74fd	369	}