[linux-2.6-block.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 <linux/export.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 flowidn *flp, struct dn_fib_res *res)
{
	struct fib_lookup_arg arg = {
		.result = res,
	};
	int err;

	err = fib_rules_lookup(dn_fib_rules_ops,
			       flowidn_to_flowi(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)
{
	struct flowidn *fld = &flp->u.dn;
	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, fld, (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;
	struct flowidn *fld = &fl->u.dn;
	__le16 daddr = fld->daddr;
	__le16 saddr = fld->saddr;

	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 int dnet_addr_type(__le16 addr)
{
	struct flowidn fld = { .daddr = addr };
	struct dn_fib_res res;
	unsigned int 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, &fld, &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)) ||
	    (r->src_len &&
	     nla_put_le16(skb, FRA_SRC, r->src)))
		goto nla_put_failure;
	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_initconst 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,
	.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)
{
	rtnl_lock();
	fib_rules_unregister(dn_fib_rules_ops);
	rtnl_unlock();
	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>
bc3b2d7f	26	#include <linux/export.h>
1da177e4 LT	27	#include <net/neighbour.h>
	28	#include <net/dst.h>
	29	#include <net/flow.h>
a8731cbf	30	#include <net/fib_rules.h>
1da177e4 LT	31	#include <net/dn.h>
	32	#include <net/dn_fib.h>
	33	#include <net/dn_neigh.h>
	34	#include <net/dn_dev.h>
73417f61	35	#include <net/dn_route.h>
1da177e4	36
e9c5158a	37	static struct fib_rules_ops *dn_fib_rules_ops;
a8731cbf	38
1da177e4 LT	39	struct dn_fib_rule
1da177e4 LT	40	{
a8731cbf SW	41	struct fib_rule common;
	42	unsigned char dst_len;
	43	unsigned char src_len;
	44	__le16 src;
	45	__le16 srcmask;
	46	__le16 dst;
	47	__le16 dstmask;
	48	__le16 srcmap;
	49	u8 flags;
1da177e4 LT	50	};
1da177e4 LT	51
1da177e4	52
bef55aeb	53	int dn_fib_lookup(struct flowidn flp, struct dn_fib_res res)
1da177e4	54	{
a8731cbf SW	55	struct fib_lookup_arg arg = {
	56	.result = res,
	57	};
	58	int err;
	59
bef55aeb DM	60	err = fib_rules_lookup(dn_fib_rules_ops,
bef55aeb DM	61	flowidn_to_flowi(flp), 0, &arg);
a8731cbf	62	res->r = arg.rule;
1da177e4 LT	63
	64	return err;
	65	}
	66
2aa7f36c AB	67	static int dn_fib_rule_action(struct fib_rule rule, struct flowi flp,
2aa7f36c AB	68	int flags, struct fib_lookup_arg *arg)
ecba320f	69	{
bef55aeb	70	struct flowidn *fld = &flp->u.dn;
a8731cbf SW	71	int err = -EAGAIN;
a8731cbf SW	72	struct dn_fib_table *tbl;
ecba320f	73
a8731cbf SW	74	switch(rule->action) {
	75	case FR_ACT_TO_TBL:
	76	break;
	77
	78	case FR_ACT_UNREACHABLE:
	79	err = -ENETUNREACH;
	80	goto errout;
	81
	82	case FR_ACT_PROHIBIT:
	83	err = -EACCES;
	84	goto errout;
	85
	86	case FR_ACT_BLACKHOLE:
	87	default:
	88	err = -EINVAL;
	89	goto errout;
1da177e4	90	}
a8731cbf SW	91
	92	tbl = dn_fib_get_table(rule->table, 0);
	93	if (tbl == NULL)
	94	goto errout;
	95
bef55aeb	96	err = tbl->lookup(tbl, fld, (struct dn_fib_res *)arg->result);
a8731cbf SW	97	if (err > 0)
	98	err = -EAGAIN;
	99	errout:
	100	return err;
1da177e4 LT	101	}
1da177e4 LT	102
ef7c79ed	103	static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = {
1f6c9557	104	FRA_GENERIC_POLICY,
a8731cbf	105	};
1da177e4	106
a8731cbf	107	static int dn_fib_rule_match(struct fib_rule rule, struct flowi fl, int flags)
1da177e4	108	{
a8731cbf	109	struct dn_fib_rule r = (struct dn_fib_rule )rule;
bef55aeb DM	110	struct flowidn *fld = &fl->u.dn;
	111	__le16 daddr = fld->daddr;
	112	__le16 saddr = fld->saddr;
a8731cbf SW	113
	114	if (((saddr ^ r->src) & r->srcmask) \|\|
	115	((daddr ^ r->dst) & r->dstmask))
	116	return 0;
1da177e4	117
a8731cbf SW	118	return 1;
	119	}
	120
	121	static int dn_fib_rule_configure(struct fib_rule rule, struct sk_buff skb,
8b3521ee	122	struct fib_rule_hdr *frh,
a8731cbf SW	123	struct nlattr **tb)
	124	{
	125	int err = -EINVAL;
	126	struct dn_fib_rule r = (struct dn_fib_rule )rule;
	127
e1701c68	128	if (frh->tos)
a8731cbf SW	129	goto errout;
	130
	131	if (rule->table == RT_TABLE_UNSPEC) {
	132	if (rule->action == FR_ACT_TO_TBL) {
	133	struct dn_fib_table *table;
	134
	135	table = dn_fib_empty_table();
	136	if (table == NULL) {
	137	err = -ENOBUFS;
	138	goto errout;
	139	}
	140
	141	rule->table = table->n;
1da177e4 LT	142	}
	143	}
	144
e1701c68	145	if (frh->src_len)
2835fdfa	146	r->src = nla_get_le16(tb[FRA_SRC]);
ecba320f	147
e1701c68	148	if (frh->dst_len)
2835fdfa	149	r->dst = nla_get_le16(tb[FRA_DST]);
1da177e4	150
a8731cbf SW	151	r->src_len = frh->src_len;
	152	r->srcmask = dnet_make_mask(r->src_len);
	153	r->dst_len = frh->dst_len;
	154	r->dstmask = dnet_make_mask(r->dst_len);
	155	err = 0;
	156	errout:
	157	return err;
	158	}
1da177e4	159
a8731cbf SW	160	static int dn_fib_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
a8731cbf SW	161	struct nlattr **tb)
1da177e4	162	{
a8731cbf SW	163	struct dn_fib_rule r = (struct dn_fib_rule )rule;
	164
	165	if (frh->src_len && (r->src_len != frh->src_len))
	166	return 0;
1da177e4	167
a8731cbf SW	168	if (frh->dst_len && (r->dst_len != frh->dst_len))
a8731cbf SW	169	return 0;
ecba320f	170
e1701c68	171	if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
a8731cbf SW	172	return 0;
a8731cbf SW	173
e1701c68	174	if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
a8731cbf	175	return 0;
1da177e4	176
a8731cbf	177	return 1;
1da177e4 LT	178	}
1da177e4 LT	179
95c96174	180	unsigned int dnet_addr_type(__le16 addr)
1da177e4	181	{
bef55aeb	182	struct flowidn fld = { .daddr = addr };
1da177e4	183	struct dn_fib_res res;
95c96174	184	unsigned int ret = RTN_UNICAST;
abcab268	185	struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
1da177e4 LT	186
	187	res.r = NULL;
	188
	189	if (tb) {
bef55aeb	190	if (!tb->lookup(tb, &fld, &res)) {
1da177e4 LT	191	ret = res.type;
	192	dn_fib_res_put(&res);
	193	}
	194	}
	195	return ret;
	196	}
	197
a8731cbf	198	static int dn_fib_rule_fill(struct fib_rule rule, struct sk_buff skb,
04af8cf6	199	struct fib_rule_hdr *frh)
1da177e4	200	{
a8731cbf	201	struct dn_fib_rule r = (struct dn_fib_rule )rule;
1da177e4	202
a8731cbf SW	203	frh->dst_len = r->dst_len;
	204	frh->src_len = r->src_len;
	205	frh->tos = 0;
1da177e4	206
b21dddb9 DM	207	if ((r->dst_len &&
	208	nla_put_le16(skb, FRA_DST, r->dst)) \|\|
	209	(r->src_len &&
	210	nla_put_le16(skb, FRA_SRC, r->src)))
	211	goto nla_put_failure;
a8731cbf	212	return 0;
1da177e4	213
a8731cbf SW	214	nla_put_failure:
a8731cbf SW	215	return -ENOBUFS;
1da177e4 LT	216	}
1da177e4 LT	217
ae299fc0	218	static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
73417f61	219	{
4b19ca44	220	dn_rt_cache_flush(-1);
73417f61 TG	221	}
73417f61 TG	222
04a6f82c	223	static const struct fib_rules_ops __net_initconst dn_fib_rules_ops_template = {
25239cee	224	.family = AF_DECnet,
a8731cbf	225	.rule_size = sizeof(struct dn_fib_rule),
e1701c68	226	.addr_size = sizeof(u16),
a8731cbf SW	227	.action = dn_fib_rule_action,
	228	.match = dn_fib_rule_match,
	229	.configure = dn_fib_rule_configure,
	230	.compare = dn_fib_rule_compare,
	231	.fill = dn_fib_rule_fill,
73417f61	232	.flush_cache = dn_fib_rule_flush_cache,
a8731cbf SW	233	.nlgroup = RTNLGRP_DECnet_RULE,
a8731cbf SW	234	.policy = dn_fib_rule_policy,
a8731cbf	235	.owner = THIS_MODULE,
03592383	236	.fro_net = &init_net,
a8731cbf SW	237	};
a8731cbf SW	238
1da177e4 LT	239	void __init dn_fib_rules_init(void)
1da177e4 LT	240	{
e9c5158a EB	241	dn_fib_rules_ops =
	242	fib_rules_register(&dn_fib_rules_ops_template, &init_net);
	243	BUG_ON(IS_ERR(dn_fib_rules_ops));
	244	BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff,
2994c638	245	RT_TABLE_MAIN, 0));
1da177e4 LT	246	}
	247
	248	void __exit dn_fib_rules_cleanup(void)
	249	{
419df12f	250	rtnl_lock();
e9c5158a	251	fib_rules_unregister(dn_fib_rules_ops);
419df12f	252	rtnl_unlock();
e9c5158a	253	rcu_barrier();
1da177e4 LT	254	}
	255
	256