[net-next-2.6.git] / net / decnet / dn_rules.c


/*
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              DECnet Routing Forwarding Information Base (Rules)
 *
 * Author:      Steve Whitehouse <SteveW@ACM.org>
 *              Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
 *
 *
 * Changes:
 *              Steve Whitehouse <steve@chygwyn.com>
 *              Updated for Thomas Graf's generic rules
 *
 */
#include <linux/net.h>
#include <linux/init.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/fib_rules.h>
#include <net/dn.h>
#include <net/dn_fib.h>
#include <net/dn_neigh.h>
#include <net/dn_dev.h>
#include <net/dn_route.h>

static struct fib_rules_ops *dn_fib_rules_ops;

struct dn_fib_rule
{
	struct fib_rule		common;
	unsigned char		dst_len;
	unsigned char		src_len;
	__le16			src;
	__le16			srcmask;
	__le16			dst;
	__le16			dstmask;
	__le16			srcmap;
	u8			flags;
};


int dn_fib_lookup(struct flowi *flp, struct dn_fib_res *res)
{
	struct fib_lookup_arg arg = {
		.result = res,
	};
	int err;

	err = fib_rules_lookup(dn_fib_rules_ops, flp, 0, &arg);
	res->r = arg.rule;

	return err;
}

static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp,
			      int flags, struct fib_lookup_arg *arg)
{
	int err = -EAGAIN;
	struct dn_fib_table *tbl;

	switch(rule->action) {
	case FR_ACT_TO_TBL:
		break;

	case FR_ACT_UNREACHABLE:
		err = -ENETUNREACH;
		goto errout;

	case FR_ACT_PROHIBIT:
		err = -EACCES;
		goto errout;

	case FR_ACT_BLACKHOLE:
	default:
		err = -EINVAL;
		goto errout;
	}

	tbl = dn_fib_get_table(rule->table, 0);
	if (tbl == NULL)
		goto errout;

	err = tbl->lookup(tbl, flp, (struct dn_fib_res *)arg->result);
	if (err > 0)
		err = -EAGAIN;
errout:
	return err;
}

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

static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
	__le16 daddr = fl->fld_dst;
	__le16 saddr = fl->fld_src;

	if (((saddr ^ r->src) & r->srcmask) ||
	    ((daddr ^ r->dst) & r->dstmask))
		return 0;

	return 1;
}

static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
				 struct fib_rule_hdr *frh,
				 struct nlattr **tb)
{
	int err = -EINVAL;
	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;

	if (frh->tos)
		goto  errout;

	if (rule->table == RT_TABLE_UNSPEC) {
		if (rule->action == FR_ACT_TO_TBL) {
			struct dn_fib_table *table;

			table = dn_fib_empty_table();
			if (table == NULL) {
				err = -ENOBUFS;
				goto errout;
			}

			rule->table = table->n;
		}
	}

	if (frh->src_len)
		r->src = nla_get_le16(tb[FRA_SRC]);

	if (frh->dst_len)
		r->dst = nla_get_le16(tb[FRA_DST]);

	r->src_len = frh->src_len;
	r->srcmask = dnet_make_mask(r->src_len);
	r->dst_len = frh->dst_len;
	r->dstmask = dnet_make_mask(r->dst_len);
	err = 0;
errout:
	return err;
}

static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
			       struct nlattr **tb)
{
	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;

	if (frh->src_len && (r->src_len != frh->src_len))
		return 0;

	if (frh->dst_len && (r->dst_len != frh->dst_len))
		return 0;

	if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
		return 0;

	if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
		return 0;

	return 1;
}

unsigned dnet_addr_type(__le16 addr)
{
	struct flowi fl = { .fld_dst = addr };
	struct dn_fib_res res;
	unsigned ret = RTN_UNICAST;
	struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);

	res.r = NULL;

	if (tb) {
		if (!tb->lookup(tb, &fl, &res)) {
			ret = res.type;
			dn_fib_res_put(&res);
		}
	}
	return ret;
}

static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
			    struct fib_rule_hdr *frh)
{
	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;

	frh->dst_len = r->dst_len;
	frh->src_len = r->src_len;
	frh->tos = 0;

	if (r->dst_len)
		NLA_PUT_LE16(skb, FRA_DST, r->dst);
	if (r->src_len)
		NLA_PUT_LE16(skb, FRA_SRC, r->src);

	return 0;

nla_put_failure:
	return -ENOBUFS;
}

static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
{
	dn_rt_cache_flush(-1);
}

static const struct fib_rules_ops __net_initdata dn_fib_rules_ops_template = {
	.family		= AF_DECnet,
	.rule_size	= sizeof(struct dn_fib_rule),
	.addr_size	= sizeof(u16),
	.action		= dn_fib_rule_action,
	.match		= dn_fib_rule_match,
	.configure	= dn_fib_rule_configure,
	.compare	= dn_fib_rule_compare,
	.fill		= dn_fib_rule_fill,
	.default_pref	= fib_default_rule_pref,
	.flush_cache	= dn_fib_rule_flush_cache,
	.nlgroup	= RTNLGRP_DECnet_RULE,
	.policy		= dn_fib_rule_policy,
	.owner		= THIS_MODULE,
	.fro_net	= &init_net,
};

void __init dn_fib_rules_init(void)
{
	dn_fib_rules_ops =
		fib_rules_register(&dn_fib_rules_ops_template, &init_net);
	BUG_ON(IS_ERR(dn_fib_rules_ops));
	BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff,
			            RT_TABLE_MAIN, 0));
}

void __exit dn_fib_rules_cleanup(void)
{
	fib_rules_unregister(dn_fib_rules_ops);
	rcu_barrier();
}
Commit	Line	Data
1da177e4 LT	1
	2	/*
	3	* DECnet An implementation of the DECnet protocol suite for the LINUX
	4	* operating system. DECnet is implemented using the BSD Socket
	5	* interface as the means of communication with the user level.
	6	*
	7	* DECnet Routing Forwarding Information Base (Rules)
	8	*
	9	* Author: Steve Whitehouse <SteveW@ACM.org>
	10	* Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
	11	*
	12	*
	13	* Changes:
a8731cbf SW	14	* Steve Whitehouse <steve@chygwyn.com>
a8731cbf SW	15	* Updated for Thomas Graf's generic rules
1da177e4 LT	16	*
1da177e4 LT	17	*/
1da177e4	18	#include <linux/net.h>
1da177e4	19	#include <linux/init.h>
1da177e4 LT	20	#include <linux/netlink.h>
1da177e4 LT	21	#include <linux/rtnetlink.h>
1da177e4	22	#include <linux/netdevice.h>
1da177e4	23	#include <linux/spinlock.h>
ecba320f SW	24	#include <linux/list.h>
ecba320f SW	25	#include <linux/rcupdate.h>
1da177e4 LT	26	#include <net/neighbour.h>
	27	#include <net/dst.h>
	28	#include <net/flow.h>
a8731cbf	29	#include <net/fib_rules.h>
1da177e4 LT	30	#include <net/dn.h>
	31	#include <net/dn_fib.h>
	32	#include <net/dn_neigh.h>
	33	#include <net/dn_dev.h>
73417f61	34	#include <net/dn_route.h>
1da177e4	35
e9c5158a	36	static struct fib_rules_ops *dn_fib_rules_ops;
a8731cbf	37
1da177e4 LT	38	struct dn_fib_rule
1da177e4 LT	39	{
a8731cbf SW	40	struct fib_rule common;
	41	unsigned char dst_len;
	42	unsigned char src_len;
	43	__le16 src;
	44	__le16 srcmask;
	45	__le16 dst;
	46	__le16 dstmask;
	47	__le16 srcmap;
	48	u8 flags;
1da177e4 LT	49	};
1da177e4 LT	50
1da177e4	51
a8731cbf	52	int dn_fib_lookup(struct flowi flp, struct dn_fib_res res)
1da177e4	53	{
a8731cbf SW	54	struct fib_lookup_arg arg = {
	55	.result = res,
	56	};
	57	int err;
	58
e9c5158a	59	err = fib_rules_lookup(dn_fib_rules_ops, flp, 0, &arg);
a8731cbf	60	res->r = arg.rule;
1da177e4 LT	61
	62	return err;
	63	}
	64
2aa7f36c AB	65	static int dn_fib_rule_action(struct fib_rule rule, struct flowi flp,
2aa7f36c AB	66	int flags, struct fib_lookup_arg *arg)
ecba320f	67	{
a8731cbf SW	68	int err = -EAGAIN;
a8731cbf SW	69	struct dn_fib_table *tbl;
ecba320f	70
a8731cbf SW	71	switch(rule->action) {
	72	case FR_ACT_TO_TBL:
	73	break;
	74
	75	case FR_ACT_UNREACHABLE:
	76	err = -ENETUNREACH;
	77	goto errout;
	78
	79	case FR_ACT_PROHIBIT:
	80	err = -EACCES;
	81	goto errout;
	82
	83	case FR_ACT_BLACKHOLE:
	84	default:
	85	err = -EINVAL;
	86	goto errout;
1da177e4	87	}
a8731cbf SW	88
	89	tbl = dn_fib_get_table(rule->table, 0);
	90	if (tbl == NULL)
	91	goto errout;
	92
	93	err = tbl->lookup(tbl, flp, (struct dn_fib_res *)arg->result);
	94	if (err > 0)
	95	err = -EAGAIN;
	96	errout:
	97	return err;
1da177e4 LT	98	}
1da177e4 LT	99
ef7c79ed	100	static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = {
1f6c9557	101	FRA_GENERIC_POLICY,
a8731cbf	102	};
1da177e4	103
a8731cbf	104	static int dn_fib_rule_match(struct fib_rule rule, struct flowi fl, int flags)
1da177e4	105	{
a8731cbf	106	struct dn_fib_rule r = (struct dn_fib_rule )rule;
375d9d71 SW	107	__le16 daddr = fl->fld_dst;
375d9d71 SW	108	__le16 saddr = fl->fld_src;
a8731cbf SW	109
	110	if (((saddr ^ r->src) & r->srcmask) \|\|
	111	((daddr ^ r->dst) & r->dstmask))
	112	return 0;
1da177e4	113
a8731cbf SW	114	return 1;
	115	}
	116
	117	static int dn_fib_rule_configure(struct fib_rule rule, struct sk_buff skb,
8b3521ee	118	struct fib_rule_hdr *frh,
a8731cbf SW	119	struct nlattr **tb)
	120	{
	121	int err = -EINVAL;
	122	struct dn_fib_rule r = (struct dn_fib_rule )rule;
	123
e1701c68	124	if (frh->tos)
a8731cbf SW	125	goto errout;
	126
	127	if (rule->table == RT_TABLE_UNSPEC) {
	128	if (rule->action == FR_ACT_TO_TBL) {
	129	struct dn_fib_table *table;
	130
	131	table = dn_fib_empty_table();
	132	if (table == NULL) {
	133	err = -ENOBUFS;
	134	goto errout;
	135	}
	136
	137	rule->table = table->n;
1da177e4 LT	138	}
	139	}
	140
e1701c68	141	if (frh->src_len)
2835fdfa	142	r->src = nla_get_le16(tb[FRA_SRC]);
ecba320f	143
e1701c68	144	if (frh->dst_len)
2835fdfa	145	r->dst = nla_get_le16(tb[FRA_DST]);
1da177e4	146
a8731cbf SW	147	r->src_len = frh->src_len;
	148	r->srcmask = dnet_make_mask(r->src_len);
	149	r->dst_len = frh->dst_len;
	150	r->dstmask = dnet_make_mask(r->dst_len);
	151	err = 0;
	152	errout:
	153	return err;
	154	}
1da177e4	155
a8731cbf SW	156	static int dn_fib_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
a8731cbf SW	157	struct nlattr **tb)
1da177e4	158	{
a8731cbf SW	159	struct dn_fib_rule r = (struct dn_fib_rule )rule;
	160
	161	if (frh->src_len && (r->src_len != frh->src_len))
	162	return 0;
1da177e4	163
a8731cbf SW	164	if (frh->dst_len && (r->dst_len != frh->dst_len))
a8731cbf SW	165	return 0;
ecba320f	166
e1701c68	167	if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
a8731cbf SW	168	return 0;
a8731cbf SW	169
e1701c68	170	if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
a8731cbf	171	return 0;
1da177e4	172
a8731cbf	173	return 1;
1da177e4 LT	174	}
1da177e4 LT	175
c4ea94ab	176	unsigned dnet_addr_type(__le16 addr)
1da177e4	177	{
5811662b	178	struct flowi fl = { .fld_dst = addr };
1da177e4 LT	179	struct dn_fib_res res;
1da177e4 LT	180	unsigned ret = RTN_UNICAST;
abcab268	181	struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
1da177e4 LT	182
	183	res.r = NULL;
	184
	185	if (tb) {
	186	if (!tb->lookup(tb, &fl, &res)) {
	187	ret = res.type;
	188	dn_fib_res_put(&res);
	189	}
	190	}
	191	return ret;
	192	}
	193
a8731cbf	194	static int dn_fib_rule_fill(struct fib_rule rule, struct sk_buff skb,
04af8cf6	195	struct fib_rule_hdr *frh)
1da177e4	196	{
a8731cbf	197	struct dn_fib_rule r = (struct dn_fib_rule )rule;
1da177e4	198
a8731cbf SW	199	frh->dst_len = r->dst_len;
	200	frh->src_len = r->src_len;
	201	frh->tos = 0;
1da177e4	202
a8731cbf	203	if (r->dst_len)
2835fdfa	204	NLA_PUT_LE16(skb, FRA_DST, r->dst);
a8731cbf	205	if (r->src_len)
2835fdfa	206	NLA_PUT_LE16(skb, FRA_SRC, r->src);
1da177e4	207
a8731cbf	208	return 0;
1da177e4	209
a8731cbf SW	210	nla_put_failure:
a8731cbf SW	211	return -ENOBUFS;
1da177e4 LT	212	}
1da177e4 LT	213
ae299fc0	214	static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
73417f61	215	{
4b19ca44	216	dn_rt_cache_flush(-1);
73417f61 TG	217	}
73417f61 TG	218
3d0c9c4e	219	static const struct fib_rules_ops __net_initdata dn_fib_rules_ops_template = {
25239cee	220	.family = AF_DECnet,
a8731cbf	221	.rule_size = sizeof(struct dn_fib_rule),
e1701c68	222	.addr_size = sizeof(u16),
a8731cbf SW	223	.action = dn_fib_rule_action,
	224	.match = dn_fib_rule_match,
	225	.configure = dn_fib_rule_configure,
	226	.compare = dn_fib_rule_compare,
	227	.fill = dn_fib_rule_fill,
d8a566be	228	.default_pref = fib_default_rule_pref,
73417f61	229	.flush_cache = dn_fib_rule_flush_cache,
a8731cbf SW	230	.nlgroup = RTNLGRP_DECnet_RULE,
a8731cbf SW	231	.policy = dn_fib_rule_policy,
a8731cbf	232	.owner = THIS_MODULE,
03592383	233	.fro_net = &init_net,
a8731cbf SW	234	};
a8731cbf SW	235
1da177e4 LT	236	void __init dn_fib_rules_init(void)
1da177e4 LT	237	{
e9c5158a EB	238	dn_fib_rules_ops =
	239	fib_rules_register(&dn_fib_rules_ops_template, &init_net);
	240	BUG_ON(IS_ERR(dn_fib_rules_ops));
	241	BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff,
2994c638	242	RT_TABLE_MAIN, 0));
1da177e4 LT	243	}
	244
	245	void __exit dn_fib_rules_cleanup(void)
	246	{
e9c5158a EB	247	fib_rules_unregister(dn_fib_rules_ops);
e9c5158a EB	248	rcu_barrier();
1da177e4 LT	249	}
	250
	251