[GitHub/mt8127/android_kernel_alcatel_ttab.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
	u8			fwmark;
#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 && (r->fwmark != fl->fl6_fwmark))
		return 0;
#endif

	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));

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