[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 <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;
	__be32			src;
	__be32			srcmask;
	__be32			dst;
	__be32			dstmask;
	u32			fwmark;
	u32			fwmask;
#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;
	__be32 daddr = fl->fl4_dst;
	__be32 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;

	if ((r->fwmark ^ fl->mark) & r->fwmask)
		return 0;

	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_be32(tb[FRA_SRC]);

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

	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]);

#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;

	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;

#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_be32(tb[FRA_SRC])))
		return 0;

	if (tb[FRA_DST] && (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 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;

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

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

	if (rule4->dst_len)
		NLA_PUT_BE32(skb, FRA_DST, rule4->dst);

	if (rule4->src_len)
		NLA_PUT_BE32(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;
81f7bf6c AV	43	__be32 src;
	44	__be32 srcmask;
	45	__be32 dst;
	46	__be32 dstmask;
e1ef4bf2	47	u32 fwmark;
bbfb39cb	48	u32 fwmask;
1da177e4	49	#ifdef CONFIG_NET_CLS_ROUTE
e1ef4bf2	50	u32 tclassid;
1da177e4	51	#endif
1da177e4 LT	52	};
1da177e4 LT	53
e1ef4bf2 TG	54	static struct fib4_rule default_rule = {
	55	.common = {
	56	.refcnt = ATOMIC_INIT(2),
	57	.pref = 0x7FFF,
	58	.table = RT_TABLE_DEFAULT,
	59	.action = FR_ACT_TO_TBL,
	60	},
1da177e4 LT	61	};
1da177e4 LT	62
e1ef4bf2 TG	63	static struct fib4_rule main_rule = {
	64	.common = {
	65	.refcnt = ATOMIC_INIT(2),
	66	.pref = 0x7FFE,
	67	.table = RT_TABLE_MAIN,
	68	.action = FR_ACT_TO_TBL,
	69	},
1da177e4 LT	70	};
1da177e4 LT	71
e1ef4bf2 TG	72	static struct fib4_rule local_rule = {
	73	.common = {
	74	.refcnt = ATOMIC_INIT(2),
	75	.table = RT_TABLE_LOCAL,
	76	.action = FR_ACT_TO_TBL,
	77	.flags = FIB_RULE_PERMANENT,
	78	},
1da177e4 LT	79	};
1da177e4 LT	80
e1ef4bf2 TG	81	static LIST_HEAD(fib4_rules);
	82
	83	#ifdef CONFIG_NET_CLS_ROUTE
	84	u32 fib_rules_tclass(struct fib_result *res)
	85	{
	86	return res->r ? ((struct fib4_rule *) res->r)->tclassid : 0;
	87	}
	88	#endif
7b204afd	89
e1ef4bf2 TG	90	int fib_lookup(struct flowi flp, struct fib_result res)
	91	{
	92	struct fib_lookup_arg arg = {
	93	.result = res,
	94	};
	95	int err;
1da177e4	96
e1ef4bf2 TG	97	err = fib_rules_lookup(&fib4_rules_ops, flp, 0, &arg);
e1ef4bf2 TG	98	res->r = arg.rule;
a5cdc030	99
e1ef4bf2 TG	100	return err;
	101	}
	102
8ce11e6a AB	103	static int fib4_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	104	int flags, struct fib_lookup_arg *arg)
1da177e4	105	{
e1ef4bf2 TG	106	int err = -EAGAIN;
	107	struct fib_table *tbl;
	108
	109	switch (rule->action) {
	110	case FR_ACT_TO_TBL:
	111	break;
	112
	113	case FR_ACT_UNREACHABLE:
	114	err = -ENETUNREACH;
	115	goto errout;
	116
	117	case FR_ACT_PROHIBIT:
	118	err = -EACCES;
	119	goto errout;
	120
	121	case FR_ACT_BLACKHOLE:
	122	default:
	123	err = -EINVAL;
	124	goto errout;
1da177e4	125	}
e1ef4bf2 TG	126
	127	if ((tbl = fib_get_table(rule->table)) == NULL)
	128	goto errout;
	129
	130	err = tbl->tb_lookup(tbl, flp, (struct fib_result *) arg->result);
	131	if (err > 0)
	132	err = -EAGAIN;
	133	errout:
1da177e4 LT	134	return err;
	135	}
	136
e1ef4bf2 TG	137
	138	void fib_select_default(const struct flowi flp, struct fib_result res)
	139	{
	140	if (res->r && res->r->action == FR_ACT_TO_TBL &&
	141	FIB_RES_GW(res) && FIB_RES_NH(res).nh_scope == RT_SCOPE_LINK) {
	142	struct fib_table *tb;
	143	if ((tb = fib_get_table(res->r->table)) != NULL)
	144	tb->tb_select_default(tb, flp, res);
	145	}
	146	}
	147
	148	static int fib4_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	149	{
	150	struct fib4_rule r = (struct fib4_rule ) rule;
81f7bf6c AV	151	__be32 daddr = fl->fl4_dst;
81f7bf6c AV	152	__be32 saddr = fl->fl4_src;
e1ef4bf2 TG	153
	154	if (((saddr ^ r->src) & r->srcmask) \|\|
	155	((daddr ^ r->dst) & r->dstmask))
	156	return 0;
	157
	158	if (r->tos && (r->tos != fl->fl4_tos))
	159	return 0;
	160
47dcf0cb	161	if ((r->fwmark ^ fl->mark) & r->fwmask)
e1ef4bf2	162	return 0;
e1ef4bf2 TG	163
	164	return 1;
	165	}
1da177e4 LT	166
	167	static struct fib_table *fib_empty_table(void)
	168	{
2dfe55b4	169	u32 id;
1da177e4 LT	170
1da177e4 LT	171	for (id = 1; id <= RT_TABLE_MAX; id++)
1af5a8c4 PM	172	if (fib_get_table(id) == NULL)
1af5a8c4 PM	173	return fib_new_table(id);
1da177e4 LT	174	return NULL;
	175	}
	176
e1ef4bf2	177	static struct nla_policy fib4_rule_policy[FRA_MAX+1] __read_mostly = {
5176f91e	178	[FRA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
e1ef4bf2 TG	179	[FRA_PRIORITY] = { .type = NLA_U32 },
	180	[FRA_SRC] = { .type = NLA_U32 },
	181	[FRA_DST] = { .type = NLA_U32 },
	182	[FRA_FWMARK] = { .type = NLA_U32 },
bbfb39cb	183	[FRA_FWMASK] = { .type = NLA_U32 },
e1ef4bf2	184	[FRA_FLOW] = { .type = NLA_U32 },
9e762a4a	185	[FRA_TABLE] = { .type = NLA_U32 },
e1ef4bf2	186	};
7b204afd	187
e1ef4bf2 TG	188	static int fib4_rule_configure(struct fib_rule rule, struct sk_buff skb,
	189	struct nlmsghdr nlh, struct fib_rule_hdr frh,
	190	struct nlattr **tb)
1da177e4	191	{
e1ef4bf2 TG	192	int err = -EINVAL;
e1ef4bf2 TG	193	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	194
e1ef4bf2 TG	195	if (frh->src_len > 32 \|\| frh->dst_len > 32 \|\|
	196	(frh->tos & ~IPTOS_TOS_MASK))
	197	goto errout;
7b204afd	198
e1ef4bf2 TG	199	if (rule->table == RT_TABLE_UNSPEC) {
	200	if (rule->action == FR_ACT_TO_TBL) {
	201	struct fib_table *table;
1da177e4	202
e1ef4bf2 TG	203	table = fib_empty_table();
	204	if (table == NULL) {
	205	err = -ENOBUFS;
	206	goto errout;
	207	}
1da177e4	208
e1ef4bf2	209	rule->table = table->tb_id;
1da177e4 LT	210	}
	211	}
	212
e1ef4bf2	213	if (tb[FRA_SRC])
45d60b9e	214	rule4->src = nla_get_be32(tb[FRA_SRC]);
7b204afd	215
e1ef4bf2	216	if (tb[FRA_DST])
45d60b9e	217	rule4->dst = nla_get_be32(tb[FRA_DST]);
7b204afd	218
bbfb39cb	219	if (tb[FRA_FWMARK]) {
e1ef4bf2	220	rule4->fwmark = nla_get_u32(tb[FRA_FWMARK]);
bbfb39cb PM	221	if (rule4->fwmark)
	222	/* compatibility: if the mark value is non-zero all bits
	223	* are compared unless a mask is explicitly specified.
	224	*/
	225	rule4->fwmask = 0xFFFFFFFF;
	226	}
	227
	228	if (tb[FRA_FWMASK])
	229	rule4->fwmask = nla_get_u32(tb[FRA_FWMASK]);
1da177e4 LT	230
1da177e4 LT	231	#ifdef CONFIG_NET_CLS_ROUTE
e1ef4bf2 TG	232	if (tb[FRA_FLOW])
e1ef4bf2 TG	233	rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
1da177e4 LT	234	#endif
1da177e4 LT	235
e1ef4bf2 TG	236	rule4->src_len = frh->src_len;
	237	rule4->srcmask = inet_make_mask(rule4->src_len);
	238	rule4->dst_len = frh->dst_len;
	239	rule4->dstmask = inet_make_mask(rule4->dst_len);
	240	rule4->tos = frh->tos;
7b204afd	241
e1ef4bf2 TG	242	err = 0;
	243	errout:
	244	return err;
1da177e4 LT	245	}
1da177e4 LT	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
e1ef4bf2 TG	261	if (tb[FRA_FWMARK] && (rule4->fwmark != nla_get_u32(tb[FRA_FWMARK])))
e1ef4bf2 TG	262	return 0;
bbfb39cb PM	263
	264	if (tb[FRA_FWMASK] && (rule4->fwmask != nla_get_u32(tb[FRA_FWMASK])))
	265	return 0;
1da177e4	266
e1ef4bf2 TG	267	#ifdef CONFIG_NET_CLS_ROUTE
	268	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
	269	return 0;
	270	#endif
1da177e4	271
45d60b9e	272	if (tb[FRA_SRC] && (rule4->src != nla_get_be32(tb[FRA_SRC])))
e1ef4bf2	273	return 0;
1da177e4	274
45d60b9e	275	if (tb[FRA_DST] && (rule4->dst != nla_get_be32(tb[FRA_DST])))
e1ef4bf2	276	return 0;
1da177e4	277
e1ef4bf2	278	return 1;
1da177e4 LT	279	}
1da177e4 LT	280
e1ef4bf2 TG	281	static int fib4_rule_fill(struct fib_rule rule, struct sk_buff skb,
	282	struct nlmsghdr nlh, struct fib_rule_hdr frh)
	283	{
	284	struct fib4_rule rule4 = (struct fib4_rule ) rule;
1da177e4	285
e1ef4bf2 TG	286	frh->family = AF_INET;
	287	frh->dst_len = rule4->dst_len;
	288	frh->src_len = rule4->src_len;
	289	frh->tos = rule4->tos;
1da177e4	290
e1ef4bf2 TG	291	if (rule4->fwmark)
e1ef4bf2 TG	292	NLA_PUT_U32(skb, FRA_FWMARK, rule4->fwmark);
bbfb39cb PM	293
	294	if (rule4->fwmask \|\| rule4->fwmark)
	295	NLA_PUT_U32(skb, FRA_FWMASK, rule4->fwmask);
e1ef4bf2 TG	296
e1ef4bf2 TG	297	if (rule4->dst_len)
45d60b9e	298	NLA_PUT_BE32(skb, FRA_DST, rule4->dst);
e1ef4bf2 TG	299
e1ef4bf2 TG	300	if (rule4->src_len)
45d60b9e	301	NLA_PUT_BE32(skb, FRA_SRC, rule4->src);
e1ef4bf2	302
1da177e4	303	#ifdef CONFIG_NET_CLS_ROUTE
e1ef4bf2 TG	304	if (rule4->tclassid)
e1ef4bf2 TG	305	NLA_PUT_U32(skb, FRA_FLOW, rule4->tclassid);
1da177e4	306	#endif
e1ef4bf2	307	return 0;
1da177e4	308
e1ef4bf2 TG	309	nla_put_failure:
e1ef4bf2 TG	310	return -ENOBUFS;
1da177e4 LT	311	}
1da177e4 LT	312
e1ef4bf2 TG	313	int fib4_rules_dump(struct sk_buff skb, struct netlink_callback cb)
	314	{
	315	return fib_rules_dump(skb, cb, AF_INET);
	316	}
7b204afd	317
e1ef4bf2	318	static u32 fib4_rule_default_pref(void)
a5cdc030	319	{
e1ef4bf2 TG	320	struct list_head *pos;
	321	struct fib_rule *rule;
	322
	323	if (!list_empty(&fib4_rules)) {
	324	pos = fib4_rules.next;
	325	if (pos->next != &fib4_rules) {
	326	rule = list_entry(pos->next, struct fib_rule, list);
	327	if (rule->pref)
	328	return rule->pref - 1;
	329	}
a5cdc030	330	}
e1ef4bf2 TG	331
e1ef4bf2 TG	332	return 0;
a5cdc030 PM	333	}
a5cdc030 PM	334
e1ef4bf2 TG	335	static struct fib_rules_ops fib4_rules_ops = {
	336	.family = AF_INET,
	337	.rule_size = sizeof(struct fib4_rule),
	338	.action = fib4_rule_action,
	339	.match = fib4_rule_match,
	340	.configure = fib4_rule_configure,
	341	.compare = fib4_rule_compare,
	342	.fill = fib4_rule_fill,
	343	.default_pref = fib4_rule_default_pref,
	344	.nlgroup = RTNLGRP_IPV4_RULE,
	345	.policy = fib4_rule_policy,
	346	.rules_list = &fib4_rules,
	347	.owner = THIS_MODULE,
	348	};
	349
	350	void __init fib4_rules_init(void)
1da177e4	351	{
e1ef4bf2 TG	352	list_add_tail(&local_rule.common.list, &fib4_rules);
	353	list_add_tail(&main_rule.common.list, &fib4_rules);
	354	list_add_tail(&default_rule.common.list, &fib4_rules);
1da177e4	355
e1ef4bf2	356	fib_rules_register(&fib4_rules_ops);
1da177e4	357	}