[net-next-2.6.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/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,
	},
};

static LIST_HEAD(fib6_rules);

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)
		goto out;
	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 (r->src.plen) {
		if (!(flags & RT6_LOOKUP_F_HAS_SADDR) ||
		    !ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
			return 0;
	}

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

	return 1;
}

static struct nla_policy fib6_rule_policy[FRA_MAX+1] __read_mostly = {
	FRA_GENERIC_POLICY,
	[FRA_SRC]	= { .len = sizeof(struct in6_addr) },
	[FRA_DST]	= { .len = sizeof(struct in6_addr) },
};

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 (frh->src_len > 128 || frh->dst_len > 128 ||
	    (frh->tos & ~IPV6_FLOWINFO_MASK))
		goto errout;

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

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

	if (tb[FRA_DST] &&
	    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;
}

int fib6_rules_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	return fib_rules_dump(skb, cb, AF_INET6);
}

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

static struct fib_rules_ops fib6_rules_ops = {
	.family			= AF_INET6,
	.rule_size		= sizeof(struct fib6_rule),
	.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,
	.nlgroup		= RTNLGRP_IPV6_RULE,
	.policy			= fib6_rule_policy,
	.rules_list		= &fib6_rules,
	.owner			= THIS_MODULE,
};

void __init fib6_rules_init(void)
{
	list_add_tail(&local_rule.common.list, &fib6_rules);
	list_add_tail(&main_rule.common.list, &fib6_rules);

	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>
	20	#include <net/ip6_route.h>
	21	#include <net/netlink.h>
	22
	23	struct fib6_rule
	24	{
	25	struct fib_rule common;
	26	struct rt6key src;
	27	struct rt6key dst;
	28	u8 tclass;
	29	};
	30
	31	static struct fib_rules_ops fib6_rules_ops;
	32
	33	static struct fib6_rule main_rule = {
	34	.common = {
	35	.refcnt = ATOMIC_INIT(2),
	36	.pref = 0x7FFE,
	37	.action = FR_ACT_TO_TBL,
	38	.table = RT6_TABLE_MAIN,
	39	},
	40	};
	41
	42	static struct fib6_rule local_rule = {
	43	.common = {
	44	.refcnt = ATOMIC_INIT(2),
	45	.pref = 0,
	46	.action = FR_ACT_TO_TBL,
	47	.table = RT6_TABLE_LOCAL,
	48	.flags = FIB_RULE_PERMANENT,
	49	},
	50	};
	51
	52	static LIST_HEAD(fib6_rules);
	53
	54	struct dst_entry fib6_rule_lookup(struct flowi fl, int flags,
	55	pol_lookup_t lookup)
	56	{
	57	struct fib_lookup_arg arg = {
	58	.lookup_ptr = lookup,
	59	};
	60
	61	fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
	62	if (arg.rule)
	63	fib_rule_put(arg.rule);
	64
b1429553	65	if (arg.result)
40aa7b90	66	return arg.result;
b1429553 VN	67
	68	dst_hold(&ip6_null_entry.u.dst);
	69	return &ip6_null_entry.u.dst;
101367c2 TG	70	}
101367c2 TG	71
8ce11e6a AB	72	static int fib6_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	73	int flags, struct fib_lookup_arg *arg)
101367c2 TG	74	{
	75	struct rt6_info *rt = NULL;
	76	struct fib6_table *table;
	77	pol_lookup_t lookup = arg->lookup_ptr;
	78
	79	switch (rule->action) {
	80	case FR_ACT_TO_TBL:
	81	break;
	82	case FR_ACT_UNREACHABLE:
	83	rt = &ip6_null_entry;
	84	goto discard_pkt;
	85	default:
	86	case FR_ACT_BLACKHOLE:
	87	rt = &ip6_blk_hole_entry;
	88	goto discard_pkt;
	89	case FR_ACT_PROHIBIT:
	90	rt = &ip6_prohibit_entry;
	91	goto discard_pkt;
	92	}
	93
	94	table = fib6_get_table(rule->table);
	95	if (table)
	96	rt = lookup(table, flp, flags);
	97
	98	if (rt != &ip6_null_entry)
	99	goto out;
101367c2	100	dst_release(&rt->u.dst);
3226f688 PM	101	rt = NULL;
	102	goto out;
	103
101367c2 TG	104	discard_pkt:
	105	dst_hold(&rt->u.dst);
	106	out:
	107	arg->result = rt;
	108	return rt == NULL ? -EAGAIN : 0;
	109	}
	110
	111
	112	static int fib6_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	113	{
	114	struct fib6_rule r = (struct fib6_rule ) rule;
	115
adaa70bb TG	116	if (r->dst.plen &&
adaa70bb TG	117	!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
101367c2 TG	118	return 0;
101367c2 TG	119
adaa70bb TG	120	if (r->src.plen) {
	121	if (!(flags & RT6_LOOKUP_F_HAS_SADDR) \|\|
	122	!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
	123	return 0;
	124	}
101367c2	125
2cc67cc7 YH	126	if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
	127	return 0;
	128
101367c2 TG	129	return 1;
	130	}
	131
2613aad5	132	static struct nla_policy fib6_rule_policy[FRA_MAX+1] __read_mostly = {
1f6c9557	133	FRA_GENERIC_POLICY,
5176f91e TG	134	[FRA_SRC] = { .len = sizeof(struct in6_addr) },
5176f91e TG	135	[FRA_DST] = { .len = sizeof(struct in6_addr) },
101367c2 TG	136	};
	137
	138	static int fib6_rule_configure(struct fib_rule rule, struct sk_buff skb,
	139	struct nlmsghdr nlh, struct fib_rule_hdr frh,
	140	struct nlattr **tb)
	141	{
	142	int err = -EINVAL;
	143	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	144
	145	if (frh->src_len > 128 \|\| frh->dst_len > 128 \|\|
	146	(frh->tos & ~IPV6_FLOWINFO_MASK))
	147	goto errout;
	148
	149	if (rule->action == FR_ACT_TO_TBL) {
	150	if (rule->table == RT6_TABLE_UNSPEC)
	151	goto errout;
	152
	153	if (fib6_new_table(rule->table) == NULL) {
	154	err = -ENOBUFS;
	155	goto errout;
	156	}
	157	}
	158
	159	if (tb[FRA_SRC])
	160	nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
	161	sizeof(struct in6_addr));
	162
	163	if (tb[FRA_DST])
	164	nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
	165	sizeof(struct in6_addr));
	166
	167	rule6->src.plen = frh->src_len;
	168	rule6->dst.plen = frh->dst_len;
	169	rule6->tclass = frh->tos;
	170
	171	err = 0;
	172	errout:
	173	return err;
	174	}
	175
	176	static int fib6_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
	177	struct nlattr **tb)
	178	{
	179	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	180
	181	if (frh->src_len && (rule6->src.plen != frh->src_len))
	182	return 0;
	183
	184	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
	185	return 0;
	186
	187	if (frh->tos && (rule6->tclass != frh->tos))
	188	return 0;
	189
	190	if (tb[FRA_SRC] &&
	191	nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
	192	return 0;
	193
	194	if (tb[FRA_DST] &&
	195	nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
	196	return 0;
	197
	198	return 1;
	199	}
200
201	static int fib6_rule_fill(struct fib_rule rule, struct sk_buff skb,
202	struct nlmsghdr nlh, struct fib_rule_hdr frh)
203	{
204	struct fib6_rule rule6 = (struct fib6_rule ) rule;
205
206	frh->family = AF_INET6;
207	frh->dst_len = rule6->dst.plen;
208	frh->src_len = rule6->src.plen;
209	frh->tos = rule6->tclass;
210
211	if (rule6->dst.plen)
212	NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
213	&rule6->dst.addr);
214
215	if (rule6->src.plen)
216	NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
217	&rule6->src.addr);
218
219	return 0;
220
221	nla_put_failure:
222	return -ENOBUFS;
223	}
224
225	int fib6_rules_dump(struct sk_buff skb, struct netlink_callback cb)
226	{
227	return fib_rules_dump(skb, cb, AF_INET6);
228	}
229
230	static u32 fib6_rule_default_pref(void)
231	{
232	return 0x3FFF;
233	}
234
235	static struct fib_rules_ops fib6_rules_ops = {
236	.family = AF_INET6,
237	.rule_size = sizeof(struct fib6_rule),
238	.action = fib6_rule_action,
239	.match = fib6_rule_match,
240	.configure = fib6_rule_configure,
241	.compare = fib6_rule_compare,
242	.fill = fib6_rule_fill,
243	.default_pref = fib6_rule_default_pref,
244	.nlgroup = RTNLGRP_IPV6_RULE,
245	.policy = fib6_rule_policy,
246	.rules_list = &fib6_rules,
247	.owner = THIS_MODULE,
248	};
249
250	void __init fib6_rules_init(void)
251	{
252	list_add_tail(&local_rule.common.list, &fib6_rules);
253	list_add_tail(&main_rule.common.list, &fib6_rules);
254
255	fib_rules_register(&fib6_rules_ops);
256	}
257
258	void fib6_rules_cleanup(void)
259	{
260	fib_rules_unregister(&fib6_rules_ops);
261	}