[linux-2.6-block.git] / net / ipv6 / fib6_rules.c

/*
 * net/ipv6/fib6_rules.c	IPv6 Routing Policy Rules
 *
 * Copyright (C)2003-2006 Helsinki University of Technology
 * Copyright (C)2003-2006 USAGI/WIDE Project
 *
 *	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, version 2.
 *
 * Authors
 *	Thomas Graf		<tgraf@suug.ch>
 *	Ville Nuorvala		<vnuorval@tcs.hut.fi>
 */

#include <linux/netdevice.h>

#include <net/fib_rules.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/netlink.h>

struct fib6_rule
{
	struct fib_rule		common;
	struct rt6key		src;
	struct rt6key		dst;
	u8			tclass;
};

static struct fib_rules_ops fib6_rules_ops;

static struct fib6_rule main_rule = {
	.common = {
		.refcnt =	ATOMIC_INIT(2),
		.pref =		0x7FFE,
		.action =	FR_ACT_TO_TBL,
		.table =	RT6_TABLE_MAIN,
	},
};

static struct fib6_rule local_rule = {
	.common = {
		.refcnt =	ATOMIC_INIT(2),
		.pref =		0,
		.action =	FR_ACT_TO_TBL,
		.table =	RT6_TABLE_LOCAL,
		.flags =	FIB_RULE_PERMANENT,
	},
};

struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
				   pol_lookup_t lookup)
{
	struct fib_lookup_arg arg = {
		.lookup_ptr = lookup,
	};

	fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
	if (arg.rule)
		fib_rule_put(arg.rule);

	if (arg.result)
		return arg.result;

	dst_hold(&ip6_null_entry.u.dst);
	return &ip6_null_entry.u.dst;
}

static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
			    int flags, struct fib_lookup_arg *arg)
{
	struct rt6_info *rt = NULL;
	struct fib6_table *table;
	pol_lookup_t lookup = arg->lookup_ptr;

	switch (rule->action) {
	case FR_ACT_TO_TBL:
		break;
	case FR_ACT_UNREACHABLE:
		rt = &ip6_null_entry;
		goto discard_pkt;
	default:
	case FR_ACT_BLACKHOLE:
		rt = &ip6_blk_hole_entry;
		goto discard_pkt;
	case FR_ACT_PROHIBIT:
		rt = &ip6_prohibit_entry;
		goto discard_pkt;
	}

	table = fib6_get_table(rule->table);
	if (table)
		rt = lookup(table, flp, flags);

	if (rt != &ip6_null_entry) {
		struct fib6_rule *r = (struct fib6_rule *)rule;

		/*
		 * If we need to find a source address for this traffic,
		 * we check the result if it meets requirement of the rule.
		 */
		if ((rule->flags & FIB_RULE_FIND_SADDR) &&
		    r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
			struct in6_addr saddr;
			if (ipv6_get_saddr(&rt->u.dst, &flp->fl6_dst,
					   &saddr))
				goto again;
			if (!ipv6_prefix_equal(&saddr, &r->src.addr,
					       r->src.plen))
				goto again;
			ipv6_addr_copy(&flp->fl6_src, &saddr);
		}
		goto out;
	}
again:
	dst_release(&rt->u.dst);
	rt = NULL;
	goto out;

discard_pkt:
	dst_hold(&rt->u.dst);
out:
	arg->result = rt;
	return rt == NULL ? -EAGAIN : 0;
}


static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
	struct fib6_rule *r = (struct fib6_rule *) rule;

	if (r->dst.plen &&
	    !ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
		return 0;

	/*
	 * If FIB_RULE_FIND_SADDR is set and we do not have a
	 * source address for the traffic, we defer check for
	 * source address.
	 */
	if (r->src.plen) {
		if (flags & RT6_LOOKUP_F_HAS_SADDR) {
			if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr,
					       r->src.plen))
				return 0;
		} else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
			return 0;
	}

	if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
		return 0;

	return 1;
}

static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
	FRA_GENERIC_POLICY,
};

static int fib6_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 fib6_rule *rule6 = (struct fib6_rule *) rule;

	if (rule->action == FR_ACT_TO_TBL) {
		if (rule->table == RT6_TABLE_UNSPEC)
			goto errout;

		if (fib6_new_table(rule->table) == NULL) {
			err = -ENOBUFS;
			goto errout;
		}
	}

	if (frh->src_len)
		nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
			   sizeof(struct in6_addr));

	if (frh->dst_len)
		nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
			   sizeof(struct in6_addr));

	rule6->src.plen = frh->src_len;
	rule6->dst.plen = frh->dst_len;
	rule6->tclass = frh->tos;

	err = 0;
errout:
	return err;
}

static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
			     struct nlattr **tb)
{
	struct fib6_rule *rule6 = (struct fib6_rule *) rule;

	if (frh->src_len && (rule6->src.plen != frh->src_len))
		return 0;

	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
		return 0;

	if (frh->tos && (rule6->tclass != frh->tos))
		return 0;

	if (frh->src_len &&
	    nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
		return 0;

	if (frh->dst_len &&
	    nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
		return 0;

	return 1;
}

static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
			  struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
{
	struct fib6_rule *rule6 = (struct fib6_rule *) rule;

	frh->family = AF_INET6;
	frh->dst_len = rule6->dst.plen;
	frh->src_len = rule6->src.plen;
	frh->tos = rule6->tclass;

	if (rule6->dst.plen)
		NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
			&rule6->dst.addr);

	if (rule6->src.plen)
		NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
			&rule6->src.addr);

	return 0;

nla_put_failure:
	return -ENOBUFS;
}

static u32 fib6_rule_default_pref(void)
{
	return 0x3FFF;
}

static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
{
	return nla_total_size(16) /* dst */
	       + nla_total_size(16); /* src */
}

static struct fib_rules_ops fib6_rules_ops = {
	.family			= AF_INET6,
	.rule_size		= sizeof(struct fib6_rule),
	.addr_size		= sizeof(struct in6_addr),
	.action			= fib6_rule_action,
	.match			= fib6_rule_match,
	.configure		= fib6_rule_configure,
	.compare		= fib6_rule_compare,
	.fill			= fib6_rule_fill,
	.default_pref		= fib6_rule_default_pref,
	.nlmsg_payload		= fib6_rule_nlmsg_payload,
	.nlgroup		= RTNLGRP_IPV6_RULE,
	.policy			= fib6_rule_policy,
	.rules_list		= LIST_HEAD_INIT(fib6_rules_ops.rules_list),
	.owner			= THIS_MODULE,
};

void __init fib6_rules_init(void)
{
	list_add_tail(&local_rule.common.list, &fib6_rules_ops.rules_list);
	list_add_tail(&main_rule.common.list, &fib6_rules_ops.rules_list);

	fib_rules_register(&fib6_rules_ops);
}

void fib6_rules_cleanup(void)
{
	fib_rules_unregister(&fib6_rules_ops);
}
Commit	Line	Data
101367c2 TG	1	/*
	2	* net/ipv6/fib6_rules.c IPv6 Routing Policy Rules
	3	*
	4	* Copyright (C)2003-2006 Helsinki University of Technology
	5	* Copyright (C)2003-2006 USAGI/WIDE Project
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License as
	9	* published by the Free Software Foundation, version 2.
	10	*
	11	* Authors
	12	* Thomas Graf <tgraf@suug.ch>
	13	* Ville Nuorvala <vnuorval@tcs.hut.fi>
	14	*/
	15
101367c2 TG	16	#include <linux/netdevice.h>
	17
	18	#include <net/fib_rules.h>
	19	#include <net/ipv6.h>
29f6af77	20	#include <net/addrconf.h>
101367c2 TG	21	#include <net/ip6_route.h>
	22	#include <net/netlink.h>
	23
	24	struct fib6_rule
	25	{
	26	struct fib_rule common;
	27	struct rt6key src;
	28	struct rt6key dst;
	29	u8 tclass;
	30	};
	31
	32	static struct fib_rules_ops fib6_rules_ops;
	33
	34	static struct fib6_rule main_rule = {
	35	.common = {
	36	.refcnt = ATOMIC_INIT(2),
	37	.pref = 0x7FFE,
	38	.action = FR_ACT_TO_TBL,
	39	.table = RT6_TABLE_MAIN,
	40	},
	41	};
	42
	43	static struct fib6_rule local_rule = {
	44	.common = {
	45	.refcnt = ATOMIC_INIT(2),
	46	.pref = 0,
	47	.action = FR_ACT_TO_TBL,
	48	.table = RT6_TABLE_LOCAL,
	49	.flags = FIB_RULE_PERMANENT,
	50	},
	51	};
	52
101367c2 TG	53	struct dst_entry fib6_rule_lookup(struct flowi fl, int flags,
	54	pol_lookup_t lookup)
	55	{
	56	struct fib_lookup_arg arg = {
	57	.lookup_ptr = lookup,
	58	};
	59
	60	fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
	61	if (arg.rule)
	62	fib_rule_put(arg.rule);
	63
b1429553	64	if (arg.result)
40aa7b90	65	return arg.result;
b1429553 VN	66
	67	dst_hold(&ip6_null_entry.u.dst);
	68	return &ip6_null_entry.u.dst;
101367c2 TG	69	}
101367c2 TG	70
8ce11e6a AB	71	static int fib6_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	72	int flags, struct fib_lookup_arg *arg)
101367c2 TG	73	{
	74	struct rt6_info *rt = NULL;
	75	struct fib6_table *table;
	76	pol_lookup_t lookup = arg->lookup_ptr;
	77
	78	switch (rule->action) {
	79	case FR_ACT_TO_TBL:
	80	break;
	81	case FR_ACT_UNREACHABLE:
	82	rt = &ip6_null_entry;
	83	goto discard_pkt;
	84	default:
	85	case FR_ACT_BLACKHOLE:
	86	rt = &ip6_blk_hole_entry;
	87	goto discard_pkt;
	88	case FR_ACT_PROHIBIT:
	89	rt = &ip6_prohibit_entry;
	90	goto discard_pkt;
	91	}
	92
	93	table = fib6_get_table(rule->table);
	94	if (table)
	95	rt = lookup(table, flp, flags);
	96
29f6af77 YH	97	if (rt != &ip6_null_entry) {
	98	struct fib6_rule r = (struct fib6_rule )rule;
	99
	100	/*
	101	* If we need to find a source address for this traffic,
	102	* we check the result if it meets requirement of the rule.
	103	*/
	104	if ((rule->flags & FIB_RULE_FIND_SADDR) &&
	105	r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
	106	struct in6_addr saddr;
	107	if (ipv6_get_saddr(&rt->u.dst, &flp->fl6_dst,
	108	&saddr))
	109	goto again;
	110	if (!ipv6_prefix_equal(&saddr, &r->src.addr,
	111	r->src.plen))
	112	goto again;
	113	ipv6_addr_copy(&flp->fl6_src, &saddr);
	114	}
101367c2	115	goto out;
29f6af77 YH	116	}
29f6af77 YH	117	again:
101367c2	118	dst_release(&rt->u.dst);
3226f688 PM	119	rt = NULL;
	120	goto out;
	121
101367c2 TG	122	discard_pkt:
	123	dst_hold(&rt->u.dst);
	124	out:
	125	arg->result = rt;
	126	return rt == NULL ? -EAGAIN : 0;
	127	}
	128
	129
	130	static int fib6_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	131	{
	132	struct fib6_rule r = (struct fib6_rule ) rule;
	133
adaa70bb TG	134	if (r->dst.plen &&
adaa70bb TG	135	!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
101367c2 TG	136	return 0;
101367c2 TG	137
29f6af77 YH	138	/*
	139	* If FIB_RULE_FIND_SADDR is set and we do not have a
	140	* source address for the traffic, we defer check for
	141	* source address.
	142	*/
adaa70bb	143	if (r->src.plen) {
29f6af77 YH	144	if (flags & RT6_LOOKUP_F_HAS_SADDR) {
	145	if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr,
	146	r->src.plen))
	147	return 0;
	148	} else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
adaa70bb TG	149	return 0;
adaa70bb TG	150	}
101367c2	151
2cc67cc7 YH	152	if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
	153	return 0;
	154
101367c2 TG	155	return 1;
	156	}
	157
ef7c79ed	158	static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
1f6c9557	159	FRA_GENERIC_POLICY,
101367c2 TG	160	};
	161
	162	static int fib6_rule_configure(struct fib_rule rule, struct sk_buff skb,
	163	struct nlmsghdr nlh, struct fib_rule_hdr frh,
	164	struct nlattr **tb)
	165	{
	166	int err = -EINVAL;
	167	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	168
101367c2 TG	169	if (rule->action == FR_ACT_TO_TBL) {
	170	if (rule->table == RT6_TABLE_UNSPEC)
	171	goto errout;
	172
	173	if (fib6_new_table(rule->table) == NULL) {
	174	err = -ENOBUFS;
	175	goto errout;
	176	}
	177	}
	178
e1701c68	179	if (frh->src_len)
101367c2 TG	180	nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
	181	sizeof(struct in6_addr));
	182
e1701c68	183	if (frh->dst_len)
101367c2 TG	184	nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
	185	sizeof(struct in6_addr));
	186
	187	rule6->src.plen = frh->src_len;
	188	rule6->dst.plen = frh->dst_len;
	189	rule6->tclass = frh->tos;
	190
	191	err = 0;
	192	errout:
	193	return err;
	194	}
	195
	196	static int fib6_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
	197	struct nlattr **tb)
	198	{
	199	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	200
	201	if (frh->src_len && (rule6->src.plen != frh->src_len))
	202	return 0;
	203
	204	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
	205	return 0;
	206
	207	if (frh->tos && (rule6->tclass != frh->tos))
	208	return 0;
	209
e1701c68	210	if (frh->src_len &&
101367c2 TG	211	nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
	212	return 0;
	213
e1701c68	214	if (frh->dst_len &&
101367c2 TG	215	nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
	216	return 0;
	217
	218	return 1;
	219	}
	220
	221	static int fib6_rule_fill(struct fib_rule rule, struct sk_buff skb,
	222	struct nlmsghdr nlh, struct fib_rule_hdr frh)
	223	{
	224	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	225
	226	frh->family = AF_INET6;
	227	frh->dst_len = rule6->dst.plen;
	228	frh->src_len = rule6->src.plen;
	229	frh->tos = rule6->tclass;
	230
	231	if (rule6->dst.plen)
	232	NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
	233	&rule6->dst.addr);
	234
	235	if (rule6->src.plen)
	236	NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
	237	&rule6->src.addr);
	238
	239	return 0;
	240
	241	nla_put_failure:
	242	return -ENOBUFS;
	243	}
	244
101367c2 TG	245	static u32 fib6_rule_default_pref(void)
	246	{
	247	return 0x3FFF;
	248	}
	249
339bf98f TG	250	static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
	251	{
	252	return nla_total_size(16) /* dst */
	253	+ nla_total_size(16); /* src */
	254	}
	255
101367c2 TG	256	static struct fib_rules_ops fib6_rules_ops = {
	257	.family = AF_INET6,
	258	.rule_size = sizeof(struct fib6_rule),
e1701c68	259	.addr_size = sizeof(struct in6_addr),
101367c2 TG	260	.action = fib6_rule_action,
	261	.match = fib6_rule_match,
	262	.configure = fib6_rule_configure,
	263	.compare = fib6_rule_compare,
	264	.fill = fib6_rule_fill,
	265	.default_pref = fib6_rule_default_pref,
339bf98f	266	.nlmsg_payload = fib6_rule_nlmsg_payload,
101367c2 TG	267	.nlgroup = RTNLGRP_IPV6_RULE,
101367c2 TG	268	.policy = fib6_rule_policy,
76c72d4f	269	.rules_list = LIST_HEAD_INIT(fib6_rules_ops.rules_list),
101367c2 TG	270	.owner = THIS_MODULE,
	271	};
	272
	273	void __init fib6_rules_init(void)
	274	{
76c72d4f DL	275	list_add_tail(&local_rule.common.list, &fib6_rules_ops.rules_list);
76c72d4f DL	276	list_add_tail(&main_rule.common.list, &fib6_rules_ops.rules_list);
101367c2 TG	277
	278	fib_rules_register(&fib6_rules_ops);
	279	}
	280
	281	void fib6_rules_cleanup(void)
	282	{
	283	fib_rules_unregister(&fib6_rules_ops);
	284	}