[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/config.h>
#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 (struct dst_entry *) 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 (!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
		return 0;

	if ((flags & RT6_F_HAS_SADDR) &&
	    !ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
		return 0;

	return 1;
}

static struct nla_policy fib6_rule_policy[RTA_MAX+1] __read_mostly = {
	[FRA_IFNAME]	= { .type = NLA_STRING },
	[FRA_PRIORITY]	= { .type = NLA_U32 },
	[FRA_SRC]	= { .minlen = sizeof(struct in6_addr) },
	[FRA_DST]	= { .minlen = sizeof(struct in6_addr) },
	[FRA_TABLE]	= { .type = NLA_U32 },
};

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
	16	#include <linux/config.h>
	17	#include <linux/netdevice.h>
	18
	19	#include <net/fib_rules.h>
	20	#include <net/ipv6.h>
	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
	53	static LIST_HEAD(fib6_rules);
	54
	55	struct dst_entry fib6_rule_lookup(struct flowi fl, int flags,
	56	pol_lookup_t lookup)
	57	{
	58	struct fib_lookup_arg arg = {
	59	.lookup_ptr = lookup,
	60	};
	61
	62	fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
	63	if (arg.rule)
	64	fib_rule_put(arg.rule);
65
b1429553 VN	66	if (arg.result)
	67	return (struct dst_entry *) arg.result;
	68
	69	dst_hold(&ip6_null_entry.u.dst);
	70	return &ip6_null_entry.u.dst;
101367c2 TG	71	}
101367c2 TG	72
8ce11e6a AB	73	static int fib6_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	74	int flags, struct fib_lookup_arg *arg)
101367c2 TG	75	{
	76	struct rt6_info *rt = NULL;
	77	struct fib6_table *table;
	78	pol_lookup_t lookup = arg->lookup_ptr;
	79
	80	switch (rule->action) {
	81	case FR_ACT_TO_TBL:
	82	break;
	83	case FR_ACT_UNREACHABLE:
	84	rt = &ip6_null_entry;
	85	goto discard_pkt;
	86	default:
	87	case FR_ACT_BLACKHOLE:
	88	rt = &ip6_blk_hole_entry;
	89	goto discard_pkt;
	90	case FR_ACT_PROHIBIT:
	91	rt = &ip6_prohibit_entry;
	92	goto discard_pkt;
	93	}
	94
	95	table = fib6_get_table(rule->table);
	96	if (table)
	97	rt = lookup(table, flp, flags);
	98
	99	if (rt != &ip6_null_entry)
	100	goto out;
101367c2	101	dst_release(&rt->u.dst);
3226f688 PM	102	rt = NULL;
	103	goto out;
	104
101367c2 TG	105	discard_pkt:
	106	dst_hold(&rt->u.dst);
	107	out:
	108	arg->result = rt;
	109	return rt == NULL ? -EAGAIN : 0;
	110	}
	111
	112
	113	static int fib6_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	114	{
	115	struct fib6_rule r = (struct fib6_rule ) rule;
	116
	117	if (!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
	118	return 0;
	119
	120	if ((flags & RT6_F_HAS_SADDR) &&
	121	!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
	122	return 0;
	123
	124	return 1;
	125	}
	126
	127	static struct nla_policy fib6_rule_policy[RTA_MAX+1] __read_mostly = {
	128	[FRA_IFNAME] = { .type = NLA_STRING },
	129	[FRA_PRIORITY] = { .type = NLA_U32 },
	130	[FRA_SRC] = { .minlen = sizeof(struct in6_addr) },
	131	[FRA_DST] = { .minlen = sizeof(struct in6_addr) },
9e762a4a	132	[FRA_TABLE] = { .type = NLA_U32 },
101367c2 TG	133	};
	134
	135	static int fib6_rule_configure(struct fib_rule rule, struct sk_buff skb,
	136	struct nlmsghdr nlh, struct fib_rule_hdr frh,
	137	struct nlattr **tb)
	138	{
	139	int err = -EINVAL;
	140	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	141
	142	if (frh->src_len > 128 \|\| frh->dst_len > 128 \|\|
	143	(frh->tos & ~IPV6_FLOWINFO_MASK))
	144	goto errout;
	145
	146	if (rule->action == FR_ACT_TO_TBL) {
	147	if (rule->table == RT6_TABLE_UNSPEC)
	148	goto errout;
	149
	150	if (fib6_new_table(rule->table) == NULL) {
	151	err = -ENOBUFS;
	152	goto errout;
	153	}
	154	}
	155
	156	if (tb[FRA_SRC])
	157	nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
	158	sizeof(struct in6_addr));
	159
	160	if (tb[FRA_DST])
	161	nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
	162	sizeof(struct in6_addr));
	163
	164	rule6->src.plen = frh->src_len;
	165	rule6->dst.plen = frh->dst_len;
	166	rule6->tclass = frh->tos;
	167
	168	err = 0;
	169	errout:
	170	return err;
	171	}
	172
	173	static int fib6_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
	174	struct nlattr **tb)
	175	{
	176	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	177
	178	if (frh->src_len && (rule6->src.plen != frh->src_len))
	179	return 0;
	180
	181	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
	182	return 0;
	183
	184	if (frh->tos && (rule6->tclass != frh->tos))
	185	return 0;
	186
	187	if (tb[FRA_SRC] &&
	188	nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
	189	return 0;
	190
	191	if (tb[FRA_DST] &&
	192	nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
	193	return 0;
	194
	195	return 1;
	196	}
197
198	static int fib6_rule_fill(struct fib_rule rule, struct sk_buff skb,
199	struct nlmsghdr nlh, struct fib_rule_hdr frh)
200	{
201	struct fib6_rule rule6 = (struct fib6_rule ) rule;
202
203	frh->family = AF_INET6;
204	frh->dst_len = rule6->dst.plen;
205	frh->src_len = rule6->src.plen;
206	frh->tos = rule6->tclass;
207
208	if (rule6->dst.plen)
209	NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
210	&rule6->dst.addr);
211
212	if (rule6->src.plen)
213	NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
214	&rule6->src.addr);
215
216	return 0;
217
218	nla_put_failure:
219	return -ENOBUFS;
220	}
221
222	int fib6_rules_dump(struct sk_buff skb, struct netlink_callback cb)
223	{
224	return fib_rules_dump(skb, cb, AF_INET6);
225	}
226
227	static u32 fib6_rule_default_pref(void)
228	{
229	return 0x3FFF;
230	}
231
232	static struct fib_rules_ops fib6_rules_ops = {
233	.family = AF_INET6,
234	.rule_size = sizeof(struct fib6_rule),
235	.action = fib6_rule_action,
236	.match = fib6_rule_match,
237	.configure = fib6_rule_configure,
238	.compare = fib6_rule_compare,
239	.fill = fib6_rule_fill,
240	.default_pref = fib6_rule_default_pref,
241	.nlgroup = RTNLGRP_IPV6_RULE,
242	.policy = fib6_rule_policy,
243	.rules_list = &fib6_rules,
244	.owner = THIS_MODULE,
245	};
246
247	void __init fib6_rules_init(void)
248	{
249	list_add_tail(&local_rule.common.list, &fib6_rules);
250	list_add_tail(&main_rule.common.list, &fib6_rules);
251
252	fib_rules_register(&fib6_rules_ops);
253	}
254
255	void fib6_rules_cleanup(void)
256	{
257	fib_rules_unregister(&fib6_rules_ops);
258	}