[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;
	u32 tb_id;

	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();

	tb_id = fib_rule_get_table(rule, arg);
	tbl = fib_get_table(rule->fr_net, tb_id);
	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 && !rule->l3mdev) {
		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;
e1ef4bf2 TG	78	struct fib_table *tbl;
96c63fa7	79	u32 tb_id;
e1ef4bf2 TG	80
	81	switch (rule->action) {
	82	case FR_ACT_TO_TBL:
	83	break;
	84
	85	case FR_ACT_UNREACHABLE:
345e9b54	86	return -ENETUNREACH;
e1ef4bf2 TG	87
e1ef4bf2 TG	88	case FR_ACT_PROHIBIT:
345e9b54	89	return -EACCES;
e1ef4bf2 TG	90
	91	case FR_ACT_BLACKHOLE:
	92	default:
345e9b54	93	return -EINVAL;
1da177e4	94	}
e1ef4bf2	95
345e9b54 AD	96	rcu_read_lock();
345e9b54 AD	97
96c63fa7 DA	98	tb_id = fib_rule_get_table(rule, arg);
96c63fa7 DA	99	tbl = fib_get_table(rule->fr_net, tb_id);
345e9b54 AD	100	if (tbl)
	101	err = fib_table_lookup(tbl, &flp->u.ip4,
	102	(struct fib_result *)arg->result,
	103	arg->flags);
e1ef4bf2	104
345e9b54	105	rcu_read_unlock();
1da177e4 LT	106	return err;
	107	}
	108
7764a45a ST	109	static bool fib4_rule_suppress(struct fib_rule rule, struct fib_lookup_arg arg)
7764a45a ST	110	{
6ef94cfa	111	struct fib_result result = (struct fib_result ) arg->result;
673498b8 ST	112	struct net_device *dev = NULL;
	113
	114	if (result->fi)
	115	dev = result->fi->fib_dev;
6ef94cfa	116
7764a45a ST	117	/* do not accept result if the route does
	118	* not meet the required prefix length
	119	*/
73f5698e	120	if (result->prefixlen <= rule->suppress_prefixlen)
6ef94cfa ST	121	goto suppress_route;
	122
	123	/* do not accept result if the route uses a device
	124	* belonging to a forbidden interface group
	125	*/
	126	if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
	127	goto suppress_route;
	128
7764a45a	129	return false;
6ef94cfa ST	130
	131	suppress_route:
	132	if (!(arg->flags & FIB_LOOKUP_NOREF))
	133	fib_info_put(result->fi);
	134	return true;
7764a45a	135	}
e1ef4bf2	136
e1ef4bf2 TG	137	static int fib4_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	138	{
	139	struct fib4_rule r = (struct fib4_rule ) rule;
9ade2286 DM	140	struct flowi4 *fl4 = &fl->u.ip4;
	141	__be32 daddr = fl4->daddr;
	142	__be32 saddr = fl4->saddr;
e1ef4bf2 TG	143
	144	if (((saddr ^ r->src) & r->srcmask) \|\|
	145	((daddr ^ r->dst) & r->dstmask))
	146	return 0;
	147
9ade2286	148	if (r->tos && (r->tos != fl4->flowi4_tos))
e1ef4bf2 TG	149	return 0;
e1ef4bf2 TG	150
e1ef4bf2 TG	151	return 1;
e1ef4bf2 TG	152	}
1da177e4	153
8ad4942c	154	static struct fib_table fib_empty_table(struct net net)
1da177e4	155	{
2dfe55b4	156	u32 id;
1da177e4 LT	157
1da177e4 LT	158	for (id = 1; id <= RT_TABLE_MAX; id++)
51456b29	159	if (!fib_get_table(net, id))
8ad4942c	160	return fib_new_table(net, id);
1da177e4 LT	161	return NULL;
	162	}
	163
ef7c79ed	164	static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
1f6c9557	165	FRA_GENERIC_POLICY,
e1ef4bf2 TG	166	[FRA_FLOW] = { .type = NLA_U32 },
e1ef4bf2 TG	167	};
7b204afd	168
e1ef4bf2	169	static int fib4_rule_configure(struct fib_rule rule, struct sk_buff skb,
8b3521ee	170	struct fib_rule_hdr *frh,
e1ef4bf2	171	struct nlattr **tb)
1da177e4	172	{
3b1e0a65	173	struct net *net = sock_net(skb->sk);
e1ef4bf2 TG	174	int err = -EINVAL;
e1ef4bf2 TG	175	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	176
e1701c68	177	if (frh->tos & ~IPTOS_TOS_MASK)
e1ef4bf2	178	goto errout;
7b204afd	179
0ddcf43d AD	180	/* split local/main if they are not already split */
	181	err = fib_unmerge(net);
	182	if (err)
	183	goto errout;
	184
96c63fa7	185	if (rule->table == RT_TABLE_UNSPEC && !rule->l3mdev) {
e1ef4bf2 TG	186	if (rule->action == FR_ACT_TO_TBL) {
e1ef4bf2 TG	187	struct fib_table *table;
1da177e4	188
e4e4971c	189	table = fib_empty_table(net);
51456b29	190	if (!table) {
e1ef4bf2 TG	191	err = -ENOBUFS;
	192	goto errout;
	193	}
1da177e4	194
e1ef4bf2	195	rule->table = table->tb_id;
1da177e4 LT	196	}
	197	}
	198
e1701c68	199	if (frh->src_len)
67b61f6c	200	rule4->src = nla_get_in_addr(tb[FRA_SRC]);
7b204afd	201
e1701c68	202	if (frh->dst_len)
67b61f6c	203	rule4->dst = nla_get_in_addr(tb[FRA_DST]);
7b204afd	204
c7066f70	205	#ifdef CONFIG_IP_ROUTE_CLASSID
7a9bc9b8	206	if (tb[FRA_FLOW]) {
e1ef4bf2	207	rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
7a9bc9b8	208	if (rule4->tclassid)
f4530fa5	209	net->ipv4.fib_num_tclassid_users++;
7a9bc9b8	210	}
1da177e4 LT	211	#endif
1da177e4 LT	212
e1ef4bf2 TG	213	rule4->src_len = frh->src_len;
	214	rule4->srcmask = inet_make_mask(rule4->src_len);
	215	rule4->dst_len = frh->dst_len;
	216	rule4->dstmask = inet_make_mask(rule4->dst_len);
	217	rule4->tos = frh->tos;
7b204afd	218
f4530fa5	219	net->ipv4.fib_has_custom_rules = true;
104616e7 SF	220	fib_flush_external(rule->fr_net);
104616e7 SF	221
e1ef4bf2 TG	222	err = 0;
	223	errout:
	224	return err;
1da177e4 LT	225	}
1da177e4 LT	226
0ddcf43d	227	static int fib4_rule_delete(struct fib_rule *rule)
7a9bc9b8	228	{
f4530fa5	229	struct net *net = rule->fr_net;
0ddcf43d	230	int err;
7a9bc9b8	231
0ddcf43d AD	232	/* split local/main if they are not already split */
	233	err = fib_unmerge(net);
	234	if (err)
	235	goto errout;
	236
	237	#ifdef CONFIG_IP_ROUTE_CLASSID
	238	if (((struct fib4_rule *)rule)->tclassid)
f4530fa5	239	net->ipv4.fib_num_tclassid_users--;
7a9bc9b8	240	#endif
f4530fa5	241	net->ipv4.fib_has_custom_rules = true;
104616e7	242	fib_flush_external(rule->fr_net);
0ddcf43d AD	243	errout:
0ddcf43d AD	244	return err;
7a9bc9b8 DM	245	}
7a9bc9b8 DM	246
e1ef4bf2 TG	247	static int fib4_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
e1ef4bf2 TG	248	struct nlattr **tb)
1da177e4	249	{
e1ef4bf2	250	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	251
e1ef4bf2 TG	252	if (frh->src_len && (rule4->src_len != frh->src_len))
e1ef4bf2 TG	253	return 0;
1da177e4	254
e1ef4bf2 TG	255	if (frh->dst_len && (rule4->dst_len != frh->dst_len))
e1ef4bf2 TG	256	return 0;
7b204afd	257
e1ef4bf2 TG	258	if (frh->tos && (rule4->tos != frh->tos))
e1ef4bf2 TG	259	return 0;
7b204afd	260
c7066f70	261	#ifdef CONFIG_IP_ROUTE_CLASSID
e1ef4bf2 TG	262	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
	263	return 0;
	264	#endif
1da177e4	265
67b61f6c	266	if (frh->src_len && (rule4->src != nla_get_in_addr(tb[FRA_SRC])))
e1ef4bf2	267	return 0;
1da177e4	268
67b61f6c	269	if (frh->dst_len && (rule4->dst != nla_get_in_addr(tb[FRA_DST])))
e1ef4bf2	270	return 0;
1da177e4	271
e1ef4bf2	272	return 1;
1da177e4 LT	273	}
1da177e4 LT	274
e1ef4bf2	275	static int fib4_rule_fill(struct fib_rule rule, struct sk_buff skb,
04af8cf6	276	struct fib_rule_hdr *frh)
e1ef4bf2 TG	277	{
e1ef4bf2 TG	278	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	279
e1ef4bf2 TG	280	frh->dst_len = rule4->dst_len;
	281	frh->src_len = rule4->src_len;
	282	frh->tos = rule4->tos;
1da177e4	283
f3756b79	284	if ((rule4->dst_len &&
930345ea	285	nla_put_in_addr(skb, FRA_DST, rule4->dst)) \|\|
f3756b79	286	(rule4->src_len &&
930345ea	287	nla_put_in_addr(skb, FRA_SRC, rule4->src)))
f3756b79	288	goto nla_put_failure;
c7066f70	289	#ifdef CONFIG_IP_ROUTE_CLASSID
f3756b79 DM	290	if (rule4->tclassid &&
	291	nla_put_u32(skb, FRA_FLOW, rule4->tclassid))
	292	goto nla_put_failure;
1da177e4	293	#endif
e1ef4bf2	294	return 0;
1da177e4	295
e1ef4bf2 TG	296	nla_put_failure:
e1ef4bf2 TG	297	return -ENOBUFS;
1da177e4 LT	298	}
1da177e4 LT	299
339bf98f TG	300	static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
	301	{
	302	return nla_total_size(4) /* dst */
	303	+ nla_total_size(4) /* src */
	304	+ nla_total_size(4); /* flow */
	305	}
	306
ae299fc0	307	static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
73417f61	308	{
bafa6d9d	309	rt_cache_flush(ops->fro_net);
73417f61 TG	310	}
73417f61 TG	311
04a6f82c	312	static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
25239cee	313	.family = AF_INET,
e1ef4bf2	314	.rule_size = sizeof(struct fib4_rule),
e1701c68	315	.addr_size = sizeof(u32),
e1ef4bf2	316	.action = fib4_rule_action,
7764a45a	317	.suppress = fib4_rule_suppress,
e1ef4bf2 TG	318	.match = fib4_rule_match,
e1ef4bf2 TG	319	.configure = fib4_rule_configure,
7a9bc9b8	320	.delete = fib4_rule_delete,
e1ef4bf2 TG	321	.compare = fib4_rule_compare,
e1ef4bf2 TG	322	.fill = fib4_rule_fill,
339bf98f	323	.nlmsg_payload = fib4_rule_nlmsg_payload,
73417f61	324	.flush_cache = fib4_rule_flush_cache,
e1ef4bf2 TG	325	.nlgroup = RTNLGRP_IPV4_RULE,
e1ef4bf2 TG	326	.policy = fib4_rule_policy,
e1ef4bf2 TG	327	.owner = THIS_MODULE,
	328	};
	329
e4e4971c	330	static int fib_default_rules_init(struct fib_rules_ops *ops)
1da177e4	331	{
2994c638 DL	332	int err;
2994c638 DL	333
5adef180	334	err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
2994c638 DL	335	if (err < 0)
2994c638 DL	336	return err;
e4e4971c	337	err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
2994c638 DL	338	if (err < 0)
2994c638 DL	339	return err;
e4e4971c	340	err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
2994c638 DL	341	if (err < 0)
	342	return err;
	343	return 0;
	344	}
1da177e4	345
7b1a74fd	346	int __net_init fib4_rules_init(struct net *net)
2994c638	347	{
dbb50165	348	int err;
e4e4971c DL	349	struct fib_rules_ops *ops;
e4e4971c DL	350
e9c5158a EB	351	ops = fib_rules_register(&fib4_rules_ops_template, net);
	352	if (IS_ERR(ops))
	353	return PTR_ERR(ops);
dbb50165	354
e4e4971c	355	err = fib_default_rules_init(ops);
dbb50165 DL	356	if (err < 0)
dbb50165 DL	357	goto fail;
e4e4971c	358	net->ipv4.rules_ops = ops;
f4530fa5	359	net->ipv4.fib_has_custom_rules = false;
dbb50165 DL	360	return 0;
	361
	362	fail:
	363	/* also cleans all rules already added */
9e3a5487	364	fib_rules_unregister(ops);
dbb50165	365	return err;
1da177e4	366	}
7b1a74fd DL	367
	368	void __net_exit fib4_rules_exit(struct net *net)
	369	{
9e3a5487	370	fib_rules_unregister(net->ipv4.rules_ops);
7b1a74fd	371	}