[net-next-2.6.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 <net/ip.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/ip_fib.h>
#include <net/fib_rules.h>

static struct fib_rules_ops fib4_rules_ops;

struct fib4_rule
{
	struct fib_rule		common;
	u8			dst_len;
	u8			src_len;
	u8			tos;
	u32			src;
	u32			srcmask;
	u32			dst;
	u32			dstmask;
#ifdef CONFIG_IP_ROUTE_FWMARK
	u32			fwmark;
	u32			fwmask;
#endif
#ifdef CONFIG_NET_CLS_ROUTE
	u32			tclassid;
#endif
};

static struct fib4_rule default_rule = {
	.common = {
		.refcnt =	ATOMIC_INIT(2),
		.pref =		0x7FFF,
		.table =	RT_TABLE_DEFAULT,
		.action =	FR_ACT_TO_TBL,
	},
};

static struct fib4_rule main_rule = {
	.common = {
		.refcnt =	ATOMIC_INIT(2),
		.pref =		0x7FFE,
		.table =	RT_TABLE_MAIN,
		.action =	FR_ACT_TO_TBL,
	},
};

static struct fib4_rule local_rule = {
	.common = {
		.refcnt =	ATOMIC_INIT(2),
		.table =	RT_TABLE_LOCAL,
		.action =	FR_ACT_TO_TBL,
		.flags =	FIB_RULE_PERMANENT,
	},
};

static LIST_HEAD(fib4_rules);

#ifdef CONFIG_NET_CLS_ROUTE
u32 fib_rules_tclass(struct fib_result *res)
{
	return res->r ? ((struct fib4_rule *) res->r)->tclassid : 0;
}
#endif

int fib_lookup(struct flowi *flp, struct fib_result *res)
{
	struct fib_lookup_arg arg = {
		.result = res,
	};
	int err;

	err = fib_rules_lookup(&fib4_rules_ops, flp, 0, &arg);
	res->r = arg.rule;

	return err;
}

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;
	}

	if ((tbl = fib_get_table(rule->table)) == NULL)
		goto errout;

	err = tbl->tb_lookup(tbl, flp, (struct fib_result *) arg->result);
	if (err > 0)
		err = -EAGAIN;
errout:
	return err;
}


void fib_select_default(const struct flowi *flp, struct fib_result *res)
{
	if (res->r && res->r->action == FR_ACT_TO_TBL &&
	    FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) {
		struct fib_table *tb;
		if ((tb = fib_get_table(res->r->table)) != NULL)
			tb->tb_select_default(tb, flp, res);
	}
}

static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
	struct fib4_rule *r = (struct fib4_rule *) rule;
	u32 daddr = fl->fl4_dst;
	u32 saddr = fl->fl4_src;

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

	if (r->tos && (r->tos != fl->fl4_tos))
		return 0;

#ifdef CONFIG_IP_ROUTE_FWMARK
	if ((r->fwmark ^ fl->fl4_fwmark) & r->fwmask)
		return 0;
#endif

	return 1;
}

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

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

static struct nla_policy fib4_rule_policy[FRA_MAX+1] __read_mostly = {
	[FRA_IFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
	[FRA_PRIORITY]	= { .type = NLA_U32 },
	[FRA_SRC]	= { .type = NLA_U32 },
	[FRA_DST]	= { .type = NLA_U32 },
	[FRA_FWMARK]	= { .type = NLA_U32 },
	[FRA_FWMASK]	= { .type = NLA_U32 },
	[FRA_FLOW]	= { .type = NLA_U32 },
	[FRA_TABLE]	= { .type = NLA_U32 },
};

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

	if (frh->src_len > 32 || frh->dst_len > 32 ||
	    (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();
			if (table == NULL) {
				err = -ENOBUFS;
				goto errout;
			}

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

	if (tb[FRA_SRC])
		rule4->src = nla_get_u32(tb[FRA_SRC]);

	if (tb[FRA_DST])
		rule4->dst = nla_get_u32(tb[FRA_DST]);

#ifdef CONFIG_IP_ROUTE_FWMARK
	if (tb[FRA_FWMARK]) {
		rule4->fwmark = nla_get_u32(tb[FRA_FWMARK]);
		if (rule4->fwmark)
			/* compatibility: if the mark value is non-zero all bits
			 * are compared unless a mask is explicitly specified.
			 */
			rule4->fwmask = 0xFFFFFFFF;
	}

	if (tb[FRA_FWMASK])
		rule4->fwmask = nla_get_u32(tb[FRA_FWMASK]);
#endif

#ifdef CONFIG_NET_CLS_ROUTE
	if (tb[FRA_FLOW])
		rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
#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;

	err = 0;
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_FWMARK
	if (tb[FRA_FWMARK] && (rule4->fwmark != nla_get_u32(tb[FRA_FWMARK])))
		return 0;

	if (tb[FRA_FWMASK] && (rule4->fwmask != nla_get_u32(tb[FRA_FWMASK])))
		return 0;
#endif

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

	if (tb[FRA_SRC] && (rule4->src != nla_get_u32(tb[FRA_SRC])))
		return 0;

	if (tb[FRA_DST] && (rule4->dst != nla_get_u32(tb[FRA_DST])))
		return 0;

	return 1;
}

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

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

#ifdef CONFIG_IP_ROUTE_FWMARK
	if (rule4->fwmark)
		NLA_PUT_U32(skb, FRA_FWMARK, rule4->fwmark);

	if (rule4->fwmask || rule4->fwmark)
		NLA_PUT_U32(skb, FRA_FWMASK, rule4->fwmask);
#endif

	if (rule4->dst_len)
		NLA_PUT_U32(skb, FRA_DST, rule4->dst);

	if (rule4->src_len)
		NLA_PUT_U32(skb, FRA_SRC, rule4->src);

#ifdef CONFIG_NET_CLS_ROUTE
	if (rule4->tclassid)
		NLA_PUT_U32(skb, FRA_FLOW, rule4->tclassid);
#endif
	return 0;

nla_put_failure:
	return -ENOBUFS;
}

int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	return fib_rules_dump(skb, cb, AF_INET);
}

static u32 fib4_rule_default_pref(void)
{
	struct list_head *pos;
	struct fib_rule *rule;

	if (!list_empty(&fib4_rules)) {
		pos = fib4_rules.next;
		if (pos->next != &fib4_rules) {
			rule = list_entry(pos->next, struct fib_rule, list);
			if (rule->pref)
				return rule->pref - 1;
		}
	}

	return 0;
}

static struct fib_rules_ops fib4_rules_ops = {
	.family		= AF_INET,
	.rule_size	= sizeof(struct fib4_rule),
	.action		= fib4_rule_action,
	.match		= fib4_rule_match,
	.configure	= fib4_rule_configure,
	.compare	= fib4_rule_compare,
	.fill		= fib4_rule_fill,
	.default_pref	= fib4_rule_default_pref,
	.nlgroup	= RTNLGRP_IPV4_RULE,
	.policy		= fib4_rule_policy,
	.rules_list	= &fib4_rules,
	.owner		= THIS_MODULE,
};

void __init fib4_rules_init(void)
{
	list_add_tail(&local_rule.common.list, &fib4_rules);
	list_add_tail(&main_rule.common.list, &fib4_rules);
	list_add_tail(&default_rule.common.list, &fib4_rules);

	fib_rules_register(&fib4_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>
e1ef4bf2	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:
	17	* Rani Assaf : local_rule cannot be deleted
	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>
1da177e4	29	#include <net/ip.h>
1da177e4 LT	30	#include <net/route.h>
1da177e4 LT	31	#include <net/tcp.h>
1da177e4	32	#include <net/ip_fib.h>
e1ef4bf2	33	#include <net/fib_rules.h>
1da177e4	34
e1ef4bf2	35	static struct fib_rules_ops fib4_rules_ops;
1da177e4	36
e1ef4bf2	37	struct fib4_rule
1da177e4	38	{
e1ef4bf2 TG	39	struct fib_rule common;
	40	u8 dst_len;
	41	u8 src_len;
	42	u8 tos;
	43	u32 src;
	44	u32 srcmask;
	45	u32 dst;
	46	u32 dstmask;
1da177e4	47	#ifdef CONFIG_IP_ROUTE_FWMARK
e1ef4bf2	48	u32 fwmark;
bbfb39cb	49	u32 fwmask;
1da177e4	50	#endif
1da177e4	51	#ifdef CONFIG_NET_CLS_ROUTE
e1ef4bf2	52	u32 tclassid;
1da177e4	53	#endif
1da177e4 LT	54	};
1da177e4 LT	55
e1ef4bf2 TG	56	static struct fib4_rule default_rule = {
	57	.common = {
	58	.refcnt = ATOMIC_INIT(2),
	59	.pref = 0x7FFF,
	60	.table = RT_TABLE_DEFAULT,
	61	.action = FR_ACT_TO_TBL,
	62	},
1da177e4 LT	63	};
1da177e4 LT	64
e1ef4bf2 TG	65	static struct fib4_rule main_rule = {
	66	.common = {
	67	.refcnt = ATOMIC_INIT(2),
	68	.pref = 0x7FFE,
	69	.table = RT_TABLE_MAIN,
	70	.action = FR_ACT_TO_TBL,
	71	},
1da177e4 LT	72	};
1da177e4 LT	73
e1ef4bf2 TG	74	static struct fib4_rule local_rule = {
	75	.common = {
	76	.refcnt = ATOMIC_INIT(2),
	77	.table = RT_TABLE_LOCAL,
	78	.action = FR_ACT_TO_TBL,
	79	.flags = FIB_RULE_PERMANENT,
	80	},
1da177e4 LT	81	};
1da177e4 LT	82
e1ef4bf2 TG	83	static LIST_HEAD(fib4_rules);
	84
	85	#ifdef CONFIG_NET_CLS_ROUTE
	86	u32 fib_rules_tclass(struct fib_result *res)
	87	{
	88	return res->r ? ((struct fib4_rule *) res->r)->tclassid : 0;
	89	}
	90	#endif
7b204afd	91
e1ef4bf2 TG	92	int fib_lookup(struct flowi flp, struct fib_result res)
	93	{
	94	struct fib_lookup_arg arg = {
	95	.result = res,
	96	};
	97	int err;
1da177e4	98
e1ef4bf2 TG	99	err = fib_rules_lookup(&fib4_rules_ops, flp, 0, &arg);
e1ef4bf2 TG	100	res->r = arg.rule;
a5cdc030	101
e1ef4bf2 TG	102	return err;
	103	}
	104
8ce11e6a AB	105	static int fib4_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	106	int flags, struct fib_lookup_arg *arg)
1da177e4	107	{
e1ef4bf2 TG	108	int err = -EAGAIN;
	109	struct fib_table *tbl;
	110
	111	switch (rule->action) {
	112	case FR_ACT_TO_TBL:
	113	break;
	114
	115	case FR_ACT_UNREACHABLE:
	116	err = -ENETUNREACH;
	117	goto errout;
	118
	119	case FR_ACT_PROHIBIT:
	120	err = -EACCES;
	121	goto errout;
	122
	123	case FR_ACT_BLACKHOLE:
	124	default:
	125	err = -EINVAL;
	126	goto errout;
1da177e4	127	}
e1ef4bf2 TG	128
	129	if ((tbl = fib_get_table(rule->table)) == NULL)
	130	goto errout;
	131
	132	err = tbl->tb_lookup(tbl, flp, (struct fib_result *) arg->result);
	133	if (err > 0)
	134	err = -EAGAIN;
	135	errout:
1da177e4 LT	136	return err;
	137	}
	138
e1ef4bf2 TG	139
	140	void fib_select_default(const struct flowi flp, struct fib_result res)
	141	{
	142	if (res->r && res->r->action == FR_ACT_TO_TBL &&
	143	FIB_RES_GW(res) && FIB_RES_NH(res).nh_scope == RT_SCOPE_LINK) {
	144	struct fib_table *tb;
	145	if ((tb = fib_get_table(res->r->table)) != NULL)
	146	tb->tb_select_default(tb, flp, res);
	147	}
	148	}
	149
	150	static int fib4_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	151	{
	152	struct fib4_rule r = (struct fib4_rule ) rule;
	153	u32 daddr = fl->fl4_dst;
	154	u32 saddr = fl->fl4_src;
	155
	156	if (((saddr ^ r->src) & r->srcmask) \|\|
	157	((daddr ^ r->dst) & r->dstmask))
	158	return 0;
	159
	160	if (r->tos && (r->tos != fl->fl4_tos))
	161	return 0;
	162
	163	#ifdef CONFIG_IP_ROUTE_FWMARK
bbfb39cb	164	if ((r->fwmark ^ fl->fl4_fwmark) & r->fwmask)
e1ef4bf2 TG	165	return 0;
	166	#endif
	167
	168	return 1;
	169	}
1da177e4 LT	170
	171	static struct fib_table *fib_empty_table(void)
	172	{
2dfe55b4	173	u32 id;
1da177e4 LT	174
1da177e4 LT	175	for (id = 1; id <= RT_TABLE_MAX; id++)
1af5a8c4 PM	176	if (fib_get_table(id) == NULL)
1af5a8c4 PM	177	return fib_new_table(id);
1da177e4 LT	178	return NULL;
	179	}
	180
e1ef4bf2	181	static struct nla_policy fib4_rule_policy[FRA_MAX+1] __read_mostly = {
5176f91e	182	[FRA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
e1ef4bf2 TG	183	[FRA_PRIORITY] = { .type = NLA_U32 },
	184	[FRA_SRC] = { .type = NLA_U32 },
	185	[FRA_DST] = { .type = NLA_U32 },
	186	[FRA_FWMARK] = { .type = NLA_U32 },
bbfb39cb	187	[FRA_FWMASK] = { .type = NLA_U32 },
e1ef4bf2	188	[FRA_FLOW] = { .type = NLA_U32 },
9e762a4a	189	[FRA_TABLE] = { .type = NLA_U32 },
e1ef4bf2	190	};
7b204afd	191
e1ef4bf2 TG	192	static int fib4_rule_configure(struct fib_rule rule, struct sk_buff skb,
	193	struct nlmsghdr nlh, struct fib_rule_hdr frh,
	194	struct nlattr **tb)
1da177e4	195	{
e1ef4bf2 TG	196	int err = -EINVAL;
e1ef4bf2 TG	197	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	198
e1ef4bf2 TG	199	if (frh->src_len > 32 \|\| frh->dst_len > 32 \|\|
	200	(frh->tos & ~IPTOS_TOS_MASK))
	201	goto errout;
7b204afd	202
e1ef4bf2 TG	203	if (rule->table == RT_TABLE_UNSPEC) {
	204	if (rule->action == FR_ACT_TO_TBL) {
	205	struct fib_table *table;
1da177e4	206
e1ef4bf2 TG	207	table = fib_empty_table();
	208	if (table == NULL) {
	209	err = -ENOBUFS;
	210	goto errout;
	211	}
1da177e4	212
e1ef4bf2	213	rule->table = table->tb_id;
1da177e4 LT	214	}
	215	}
	216
e1ef4bf2 TG	217	if (tb[FRA_SRC])
e1ef4bf2 TG	218	rule4->src = nla_get_u32(tb[FRA_SRC]);
7b204afd	219
e1ef4bf2 TG	220	if (tb[FRA_DST])
e1ef4bf2 TG	221	rule4->dst = nla_get_u32(tb[FRA_DST]);
7b204afd	222
e1ef4bf2	223	#ifdef CONFIG_IP_ROUTE_FWMARK
bbfb39cb	224	if (tb[FRA_FWMARK]) {
e1ef4bf2	225	rule4->fwmark = nla_get_u32(tb[FRA_FWMARK]);
bbfb39cb PM	226	if (rule4->fwmark)
	227	/* compatibility: if the mark value is non-zero all bits
	228	* are compared unless a mask is explicitly specified.
	229	*/
	230	rule4->fwmask = 0xFFFFFFFF;
	231	}
	232
	233	if (tb[FRA_FWMASK])
	234	rule4->fwmask = nla_get_u32(tb[FRA_FWMASK]);
e1ef4bf2	235	#endif
1da177e4 LT	236
1da177e4 LT	237	#ifdef CONFIG_NET_CLS_ROUTE
e1ef4bf2 TG	238	if (tb[FRA_FLOW])
e1ef4bf2 TG	239	rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
1da177e4 LT	240	#endif
1da177e4 LT	241
e1ef4bf2 TG	242	rule4->src_len = frh->src_len;
	243	rule4->srcmask = inet_make_mask(rule4->src_len);
	244	rule4->dst_len = frh->dst_len;
	245	rule4->dstmask = inet_make_mask(rule4->dst_len);
	246	rule4->tos = frh->tos;
7b204afd	247
e1ef4bf2 TG	248	err = 0;
	249	errout:
	250	return err;
1da177e4 LT	251	}
1da177e4 LT	252
e1ef4bf2 TG	253	static int fib4_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
e1ef4bf2 TG	254	struct nlattr **tb)
1da177e4	255	{
e1ef4bf2	256	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	257
e1ef4bf2 TG	258	if (frh->src_len && (rule4->src_len != frh->src_len))
e1ef4bf2 TG	259	return 0;
1da177e4	260
e1ef4bf2 TG	261	if (frh->dst_len && (rule4->dst_len != frh->dst_len))
e1ef4bf2 TG	262	return 0;
7b204afd	263
e1ef4bf2 TG	264	if (frh->tos && (rule4->tos != frh->tos))
e1ef4bf2 TG	265	return 0;
7b204afd	266
1da177e4	267	#ifdef CONFIG_IP_ROUTE_FWMARK
e1ef4bf2 TG	268	if (tb[FRA_FWMARK] && (rule4->fwmark != nla_get_u32(tb[FRA_FWMARK])))
e1ef4bf2 TG	269	return 0;
bbfb39cb PM	270
	271	if (tb[FRA_FWMASK] && (rule4->fwmask != nla_get_u32(tb[FRA_FWMASK])))
	272	return 0;
1da177e4	273	#endif
1da177e4	274
e1ef4bf2 TG	275	#ifdef CONFIG_NET_CLS_ROUTE
	276	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
	277	return 0;
	278	#endif
1da177e4	279
e1ef4bf2 TG	280	if (tb[FRA_SRC] && (rule4->src != nla_get_u32(tb[FRA_SRC])))
e1ef4bf2 TG	281	return 0;
1da177e4	282
e1ef4bf2 TG	283	if (tb[FRA_DST] && (rule4->dst != nla_get_u32(tb[FRA_DST])))
e1ef4bf2 TG	284	return 0;
1da177e4	285
e1ef4bf2	286	return 1;
1da177e4 LT	287	}
1da177e4 LT	288
e1ef4bf2 TG	289	static int fib4_rule_fill(struct fib_rule rule, struct sk_buff skb,
	290	struct nlmsghdr nlh, struct fib_rule_hdr frh)
	291	{
	292	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	293
e1ef4bf2 TG	294	frh->family = AF_INET;
	295	frh->dst_len = rule4->dst_len;
	296	frh->src_len = rule4->src_len;
	297	frh->tos = rule4->tos;
1da177e4	298
1da177e4	299	#ifdef CONFIG_IP_ROUTE_FWMARK
e1ef4bf2 TG	300	if (rule4->fwmark)
e1ef4bf2 TG	301	NLA_PUT_U32(skb, FRA_FWMARK, rule4->fwmark);
bbfb39cb PM	302
	303	if (rule4->fwmask \|\| rule4->fwmark)
	304	NLA_PUT_U32(skb, FRA_FWMASK, rule4->fwmask);
1da177e4	305	#endif
e1ef4bf2 TG	306
	307	if (rule4->dst_len)
	308	NLA_PUT_U32(skb, FRA_DST, rule4->dst);
	309
	310	if (rule4->src_len)
	311	NLA_PUT_U32(skb, FRA_SRC, rule4->src);
	312
1da177e4	313	#ifdef CONFIG_NET_CLS_ROUTE
e1ef4bf2 TG	314	if (rule4->tclassid)
e1ef4bf2 TG	315	NLA_PUT_U32(skb, FRA_FLOW, rule4->tclassid);
1da177e4	316	#endif
e1ef4bf2	317	return 0;
1da177e4	318
e1ef4bf2 TG	319	nla_put_failure:
e1ef4bf2 TG	320	return -ENOBUFS;
1da177e4 LT	321	}
1da177e4 LT	322
e1ef4bf2 TG	323	int fib4_rules_dump(struct sk_buff skb, struct netlink_callback cb)
	324	{
	325	return fib_rules_dump(skb, cb, AF_INET);
	326	}
7b204afd	327
e1ef4bf2	328	static u32 fib4_rule_default_pref(void)
a5cdc030	329	{
e1ef4bf2 TG	330	struct list_head *pos;
	331	struct fib_rule *rule;
	332
	333	if (!list_empty(&fib4_rules)) {
	334	pos = fib4_rules.next;
	335	if (pos->next != &fib4_rules) {
	336	rule = list_entry(pos->next, struct fib_rule, list);
	337	if (rule->pref)
	338	return rule->pref - 1;
	339	}
a5cdc030	340	}
e1ef4bf2 TG	341
e1ef4bf2 TG	342	return 0;
a5cdc030 PM	343	}
a5cdc030 PM	344
e1ef4bf2 TG	345	static struct fib_rules_ops fib4_rules_ops = {
	346	.family = AF_INET,
	347	.rule_size = sizeof(struct fib4_rule),
	348	.action = fib4_rule_action,
	349	.match = fib4_rule_match,
	350	.configure = fib4_rule_configure,
	351	.compare = fib4_rule_compare,
	352	.fill = fib4_rule_fill,
	353	.default_pref = fib4_rule_default_pref,
	354	.nlgroup = RTNLGRP_IPV4_RULE,
	355	.policy = fib4_rule_policy,
	356	.rules_list = &fib4_rules,
	357	.owner = THIS_MODULE,
	358	};
	359
	360	void __init fib4_rules_init(void)
1da177e4	361	{
e1ef4bf2 TG	362	list_add_tail(&local_rule.common.list, &fib4_rules);
	363	list_add_tail(&main_rule.common.list, &fib4_rules);
	364	list_add_tail(&default_rule.common.list, &fib4_rules);
1da177e4	365
e1ef4bf2	366	fib_rules_register(&fib4_rules_ops);
1da177e4	367	}