[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;
#ifdef CONFIG_IPV6_ROUTE_FWMARK
	u32			fwmark;
	u32			fwmask;
#endif
	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_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;

#ifdef CONFIG_IPV6_ROUTE_FWMARK
	if ((r->fwmark ^ fl->fl6_fwmark) & r->fwmask)
		return 0;
#endif

	return 1;
}

static struct nla_policy fib6_rule_policy[FRA_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_FWMARK]	= { .type = NLA_U32 },
	[FRA_FWMASK]	= { .type = NLA_U32 },
	[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));

#ifdef CONFIG_IPV6_ROUTE_FWMARK
	if (tb[FRA_FWMARK]) {
		rule6->fwmark = nla_get_u32(tb[FRA_FWMARK]);
		if (rule6->fwmark) {
			/*
			 * if the mark value is non-zero,
			 * all bits are compared by default
			 * unless a mask is explicitly specified.
			 */
			rule6->fwmask = 0xFFFFFFFF;
		}
	}

	if (tb[FRA_FWMASK])
		rule6->fwmask = nla_get_u32(tb[FRA_FWMASK]);
#endif

	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;

#ifdef CONFIG_IPV6_ROUTE_FWMARK
	if (tb[FRA_FWMARK] && (rule6->fwmark != nla_get_u32(tb[FRA_FWMARK])))
		return 0;

	if (tb[FRA_FWMASK] && (rule6->fwmask != nla_get_u32(tb[FRA_FWMASK])))
		return 0;
#endif

	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);

#ifdef CONFIG_IPV6_ROUTE_FWMARK
	if (rule6->fwmark)
		NLA_PUT_U32(skb, FRA_FWMARK, rule6->fwmark);

	if (rule6->fwmask || rule6->fwmark)
		NLA_PUT_U32(skb, FRA_FWMASK, rule6->fwmask);
#endif

	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;
75bff8f0	29	#ifdef CONFIG_IPV6_ROUTE_FWMARK
6c5eb6a5	30	u32 fwmark;
cd9d7426	31	u32 fwmask;
75bff8f0	32	#endif
101367c2 TG	33	u8 tclass;
	34	};
	35
	36	static struct fib_rules_ops fib6_rules_ops;
	37
	38	static struct fib6_rule main_rule = {
	39	.common = {
	40	.refcnt = ATOMIC_INIT(2),
	41	.pref = 0x7FFE,
	42	.action = FR_ACT_TO_TBL,
	43	.table = RT6_TABLE_MAIN,
	44	},
	45	};
	46
	47	static struct fib6_rule local_rule = {
	48	.common = {
	49	.refcnt = ATOMIC_INIT(2),
	50	.pref = 0,
	51	.action = FR_ACT_TO_TBL,
	52	.table = RT6_TABLE_LOCAL,
	53	.flags = FIB_RULE_PERMANENT,
	54	},
	55	};
	56
	57	static LIST_HEAD(fib6_rules);
	58
	59	struct dst_entry fib6_rule_lookup(struct flowi fl, int flags,
	60	pol_lookup_t lookup)
	61	{
	62	struct fib_lookup_arg arg = {
	63	.lookup_ptr = lookup,
	64	};
	65
	66	fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
	67	if (arg.rule)
	68	fib_rule_put(arg.rule);
	69
b1429553 VN	70	if (arg.result)
	71	return (struct dst_entry *) arg.result;
	72
	73	dst_hold(&ip6_null_entry.u.dst);
	74	return &ip6_null_entry.u.dst;
101367c2 TG	75	}
101367c2 TG	76
8ce11e6a AB	77	static int fib6_rule_action(struct fib_rule rule, struct flowi flp,
8ce11e6a AB	78	int flags, struct fib_lookup_arg *arg)
101367c2 TG	79	{
	80	struct rt6_info *rt = NULL;
	81	struct fib6_table *table;
	82	pol_lookup_t lookup = arg->lookup_ptr;
	83
	84	switch (rule->action) {
	85	case FR_ACT_TO_TBL:
	86	break;
	87	case FR_ACT_UNREACHABLE:
	88	rt = &ip6_null_entry;
	89	goto discard_pkt;
	90	default:
	91	case FR_ACT_BLACKHOLE:
	92	rt = &ip6_blk_hole_entry;
	93	goto discard_pkt;
	94	case FR_ACT_PROHIBIT:
	95	rt = &ip6_prohibit_entry;
	96	goto discard_pkt;
	97	}
	98
	99	table = fib6_get_table(rule->table);
	100	if (table)
	101	rt = lookup(table, flp, flags);
	102
	103	if (rt != &ip6_null_entry)
	104	goto out;
101367c2	105	dst_release(&rt->u.dst);
3226f688 PM	106	rt = NULL;
	107	goto out;
	108
101367c2 TG	109	discard_pkt:
	110	dst_hold(&rt->u.dst);
	111	out:
	112	arg->result = rt;
	113	return rt == NULL ? -EAGAIN : 0;
	114	}
	115
	116
	117	static int fib6_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	118	{
	119	struct fib6_rule r = (struct fib6_rule ) rule;
	120
	121	if (!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
	122	return 0;
	123
77d16f45	124	if ((flags & RT6_LOOKUP_F_HAS_SADDR) &&
101367c2 TG	125	!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
	126	return 0;
	127
2cc67cc7 YH	128	if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
	129	return 0;
	130
75bff8f0	131	#ifdef CONFIG_IPV6_ROUTE_FWMARK
366e4adc	132	if ((r->fwmark ^ fl->fl6_fwmark) & r->fwmask)
75bff8f0 YH	133	return 0;
	134	#endif
	135
101367c2 TG	136	return 1;
	137	}
	138
2613aad5	139	static struct nla_policy fib6_rule_policy[FRA_MAX+1] __read_mostly = {
101367c2 TG	140	[FRA_IFNAME] = { .type = NLA_STRING },
	141	[FRA_PRIORITY] = { .type = NLA_U32 },
	142	[FRA_SRC] = { .minlen = sizeof(struct in6_addr) },
	143	[FRA_DST] = { .minlen = sizeof(struct in6_addr) },
6c5eb6a5	144	[FRA_FWMARK] = { .type = NLA_U32 },
cd9d7426	145	[FRA_FWMASK] = { .type = NLA_U32 },
9e762a4a	146	[FRA_TABLE] = { .type = NLA_U32 },
101367c2 TG	147	};
	148
	149	static int fib6_rule_configure(struct fib_rule rule, struct sk_buff skb,
	150	struct nlmsghdr nlh, struct fib_rule_hdr frh,
	151	struct nlattr **tb)
	152	{
	153	int err = -EINVAL;
	154	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	155
	156	if (frh->src_len > 128 \|\| frh->dst_len > 128 \|\|
	157	(frh->tos & ~IPV6_FLOWINFO_MASK))
	158	goto errout;
	159
	160	if (rule->action == FR_ACT_TO_TBL) {
	161	if (rule->table == RT6_TABLE_UNSPEC)
	162	goto errout;
	163
	164	if (fib6_new_table(rule->table) == NULL) {
	165	err = -ENOBUFS;
	166	goto errout;
	167	}
	168	}
	169
	170	if (tb[FRA_SRC])
	171	nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
	172	sizeof(struct in6_addr));
	173
	174	if (tb[FRA_DST])
	175	nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
	176	sizeof(struct in6_addr));
	177
75bff8f0	178	#ifdef CONFIG_IPV6_ROUTE_FWMARK
cd9d7426	179	if (tb[FRA_FWMARK]) {
75bff8f0	180	rule6->fwmark = nla_get_u32(tb[FRA_FWMARK]);
cd9d7426 YH	181	if (rule6->fwmark) {
	182	/*
	183	* if the mark value is non-zero,
	184	* all bits are compared by default
	185	* unless a mask is explicitly specified.
	186	*/
	187	rule6->fwmask = 0xFFFFFFFF;
	188	}
	189	}
	190
	191	if (tb[FRA_FWMASK])
	192	rule6->fwmask = nla_get_u32(tb[FRA_FWMASK]);
75bff8f0 YH	193	#endif
75bff8f0 YH	194
101367c2 TG	195	rule6->src.plen = frh->src_len;
	196	rule6->dst.plen = frh->dst_len;
	197	rule6->tclass = frh->tos;
	198
	199	err = 0;
	200	errout:
	201	return err;
	202	}
	203
	204	static int fib6_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
	205	struct nlattr **tb)
	206	{
	207	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	208
	209	if (frh->src_len && (rule6->src.plen != frh->src_len))
	210	return 0;
	211
	212	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
	213	return 0;
	214
	215	if (frh->tos && (rule6->tclass != frh->tos))
	216	return 0;
	217
	218	if (tb[FRA_SRC] &&
	219	nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
	220	return 0;
	221
	222	if (tb[FRA_DST] &&
	223	nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
	224	return 0;
	225
75bff8f0 YH	226	#ifdef CONFIG_IPV6_ROUTE_FWMARK
	227	if (tb[FRA_FWMARK] && (rule6->fwmark != nla_get_u32(tb[FRA_FWMARK])))
	228	return 0;
cd9d7426 YH	229
	230	if (tb[FRA_FWMASK] && (rule6->fwmask != nla_get_u32(tb[FRA_FWMASK])))
	231	return 0;
75bff8f0 YH	232	#endif
75bff8f0 YH	233
101367c2 TG	234	return 1;
	235	}
	236
	237	static int fib6_rule_fill(struct fib_rule rule, struct sk_buff skb,
	238	struct nlmsghdr nlh, struct fib_rule_hdr frh)
	239	{
	240	struct fib6_rule rule6 = (struct fib6_rule ) rule;
	241
	242	frh->family = AF_INET6;
	243	frh->dst_len = rule6->dst.plen;
	244	frh->src_len = rule6->src.plen;
	245	frh->tos = rule6->tclass;
	246
	247	if (rule6->dst.plen)
	248	NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
	249	&rule6->dst.addr);
	250
	251	if (rule6->src.plen)
	252	NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
	253	&rule6->src.addr);
	254
75bff8f0 YH	255	#ifdef CONFIG_IPV6_ROUTE_FWMARK
	256	if (rule6->fwmark)
	257	NLA_PUT_U32(skb, FRA_FWMARK, rule6->fwmark);
cd9d7426	258
366e4adc	259	if (rule6->fwmask \|\| rule6->fwmark)
cd9d7426	260	NLA_PUT_U32(skb, FRA_FWMASK, rule6->fwmask);
75bff8f0 YH	261	#endif
75bff8f0 YH	262
101367c2 TG	263	return 0;
	264
	265	nla_put_failure:
	266	return -ENOBUFS;
	267	}
	268
	269	int fib6_rules_dump(struct sk_buff skb, struct netlink_callback cb)
	270	{
	271	return fib_rules_dump(skb, cb, AF_INET6);
	272	}
	273
	274	static u32 fib6_rule_default_pref(void)
	275	{
	276	return 0x3FFF;
	277	}
	278
	279	static struct fib_rules_ops fib6_rules_ops = {
	280	.family = AF_INET6,
	281	.rule_size = sizeof(struct fib6_rule),
	282	.action = fib6_rule_action,
	283	.match = fib6_rule_match,
	284	.configure = fib6_rule_configure,
	285	.compare = fib6_rule_compare,
	286	.fill = fib6_rule_fill,
	287	.default_pref = fib6_rule_default_pref,
	288	.nlgroup = RTNLGRP_IPV6_RULE,
	289	.policy = fib6_rule_policy,
	290	.rules_list = &fib6_rules,
	291	.owner = THIS_MODULE,
	292	};
	293
	294	void __init fib6_rules_init(void)
	295	{
	296	list_add_tail(&local_rule.common.list, &fib6_rules);
	297	list_add_tail(&main_rule.common.list, &fib6_rules);
	298
	299	fib_rules_register(&fib6_rules_ops);
	300	}
	301
	302	void fib6_rules_cleanup(void)
	303	{
	304	fib_rules_unregister(&fib6_rules_ops);
	305	}