[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>

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;
};

static struct dn_fib_rule default_rule = {
	.common = {
		.refcnt =		ATOMIC_INIT(2),
		.pref =			0x7fff,
		.table =		RT_TABLE_MAIN,
		.action =		FR_ACT_TO_TBL,
	},
};

static LIST_HEAD(dn_fib_rules);


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 struct nla_policy dn_fib_rule_policy[FRA_MAX+1] __read_mostly = {
	FRA_GENERIC_POLICY,
	[FRA_SRC]	= { .type = NLA_U16 },
	[FRA_DST]	= { .type = NLA_U16 },
};

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 nlmsghdr *nlh, struct fib_rule_hdr *frh,
				 struct nlattr **tb)
{
	int err = -EINVAL;
	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;

	if (frh->src_len > 16 || frh->dst_len > 16 || 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 (tb[FRA_SRC])
		r->src = nla_get_u16(tb[FRA_SRC]);

	if (tb[FRA_DST])
		r->dst = nla_get_u16(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 (tb[FRA_SRC] && (r->src != nla_get_u16(tb[FRA_SRC])))
		return 0;

	if (tb[FRA_DST] && (r->dst != nla_get_u16(tb[FRA_DST])))
		return 0;

	return 1;
}

unsigned dnet_addr_type(__le16 addr)
{
	struct flowi fl = { .nl_u = { .dn_u = { .daddr = 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 nlmsghdr *nlh, struct fib_rule_hdr *frh)
{
	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;

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

	if (r->dst_len)
		NLA_PUT_U16(skb, FRA_DST, r->dst);
	if (r->src_len)
		NLA_PUT_U16(skb, FRA_SRC, r->src);

	return 0;

nla_put_failure:
	return -ENOBUFS;
}

static u32 dn_fib_rule_default_pref(void)
{
	struct list_head *pos;
	struct fib_rule *rule;

	if (!list_empty(&dn_fib_rules)) {
		pos = dn_fib_rules.next;
		if (pos->next != &dn_fib_rules) {
			rule = list_entry(pos->next, struct fib_rule, list);
			if (rule->pref)
				return rule->pref - 1;
		}
	}

	return 0;
}

int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
{
	return fib_rules_dump(skb, cb, AF_DECnet);
}

static struct fib_rules_ops dn_fib_rules_ops = {
	.family		= AF_DECnet,
	.rule_size	= sizeof(struct dn_fib_rule),
	.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	= dn_fib_rule_default_pref,
	.nlgroup	= RTNLGRP_DECnet_RULE,
	.policy		= dn_fib_rule_policy,
	.rules_list	= &dn_fib_rules,
	.owner		= THIS_MODULE,
};

void __init dn_fib_rules_init(void)
{
	list_add_tail(&default_rule.common.list, &dn_fib_rules);
	fib_rules_register(&dn_fib_rules_ops);
}

void __exit dn_fib_rules_cleanup(void)
{
	fib_rules_unregister(&dn_fib_rules_ops);
}
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>
	34
a8731cbf SW	35	static struct fib_rules_ops dn_fib_rules_ops;
a8731cbf SW	36
1da177e4 LT	37	struct dn_fib_rule
1da177e4 LT	38	{
a8731cbf SW	39	struct fib_rule common;
	40	unsigned char dst_len;
	41	unsigned char src_len;
	42	__le16 src;
	43	__le16 srcmask;
	44	__le16 dst;
	45	__le16 dstmask;
	46	__le16 srcmap;
	47	u8 flags;
1da177e4 LT	48	};
	49
	50	static struct dn_fib_rule default_rule = {
a8731cbf SW	51	.common = {
	52	.refcnt = ATOMIC_INIT(2),
	53	.pref = 0x7fff,
	54	.table = RT_TABLE_MAIN,
	55	.action = FR_ACT_TO_TBL,
	56	},
1da177e4 LT	57	};
1da177e4 LT	58
a8731cbf SW	59	static LIST_HEAD(dn_fib_rules);
a8731cbf SW	60
1da177e4	61
a8731cbf	62	int dn_fib_lookup(struct flowi flp, struct dn_fib_res res)
1da177e4	63	{
a8731cbf SW	64	struct fib_lookup_arg arg = {
	65	.result = res,
	66	};
	67	int err;
	68
	69	err = fib_rules_lookup(&dn_fib_rules_ops, flp, 0, &arg);
	70	res->r = arg.rule;
1da177e4 LT	71
	72	return err;
	73	}
	74
2aa7f36c AB	75	static int dn_fib_rule_action(struct fib_rule rule, struct flowi flp,
2aa7f36c AB	76	int flags, struct fib_lookup_arg *arg)
ecba320f	77	{
a8731cbf SW	78	int err = -EAGAIN;
a8731cbf SW	79	struct dn_fib_table *tbl;
ecba320f	80
a8731cbf SW	81	switch(rule->action) {
	82	case FR_ACT_TO_TBL:
	83	break;
	84
	85	case FR_ACT_UNREACHABLE:
	86	err = -ENETUNREACH;
	87	goto errout;
	88
	89	case FR_ACT_PROHIBIT:
	90	err = -EACCES;
	91	goto errout;
	92
	93	case FR_ACT_BLACKHOLE:
	94	default:
	95	err = -EINVAL;
	96	goto errout;
1da177e4	97	}
a8731cbf SW	98
	99	tbl = dn_fib_get_table(rule->table, 0);
	100	if (tbl == NULL)
	101	goto errout;
	102
	103	err = tbl->lookup(tbl, flp, (struct dn_fib_res *)arg->result);
	104	if (err > 0)
	105	err = -EAGAIN;
	106	errout:
	107	return err;
1da177e4 LT	108	}
1da177e4 LT	109
a8731cbf	110	static struct nla_policy dn_fib_rule_policy[FRA_MAX+1] __read_mostly = {
1f6c9557	111	FRA_GENERIC_POLICY,
a8731cbf SW	112	[FRA_SRC] = { .type = NLA_U16 },
a8731cbf SW	113	[FRA_DST] = { .type = NLA_U16 },
a8731cbf	114	};
1da177e4	115
a8731cbf	116	static int dn_fib_rule_match(struct fib_rule rule, struct flowi fl, int flags)
1da177e4	117	{
a8731cbf	118	struct dn_fib_rule r = (struct dn_fib_rule )rule;
375d9d71 SW	119	__le16 daddr = fl->fld_dst;
375d9d71 SW	120	__le16 saddr = fl->fld_src;
a8731cbf SW	121
	122	if (((saddr ^ r->src) & r->srcmask) \|\|
	123	((daddr ^ r->dst) & r->dstmask))
	124	return 0;
1da177e4	125
a8731cbf SW	126	return 1;
	127	}
	128
	129	static int dn_fib_rule_configure(struct fib_rule rule, struct sk_buff skb,
	130	struct nlmsghdr nlh, struct fib_rule_hdr frh,
	131	struct nlattr **tb)
	132	{
	133	int err = -EINVAL;
	134	struct dn_fib_rule r = (struct dn_fib_rule )rule;
	135
	136	if (frh->src_len > 16 \|\| frh->dst_len > 16 \|\| frh->tos)
	137	goto errout;
	138
	139	if (rule->table == RT_TABLE_UNSPEC) {
	140	if (rule->action == FR_ACT_TO_TBL) {
	141	struct dn_fib_table *table;
	142
	143	table = dn_fib_empty_table();
	144	if (table == NULL) {
	145	err = -ENOBUFS;
	146	goto errout;
	147	}
	148
	149	rule->table = table->n;
1da177e4 LT	150	}
	151	}
	152
a8731cbf SW	153	if (tb[FRA_SRC])
a8731cbf SW	154	r->src = nla_get_u16(tb[FRA_SRC]);
ecba320f	155
a8731cbf SW	156	if (tb[FRA_DST])
a8731cbf SW	157	r->dst = nla_get_u16(tb[FRA_DST]);
1da177e4	158
a8731cbf SW	159	r->src_len = frh->src_len;
	160	r->srcmask = dnet_make_mask(r->src_len);
	161	r->dst_len = frh->dst_len;
	162	r->dstmask = dnet_make_mask(r->dst_len);
	163	err = 0;
	164	errout:
	165	return err;
	166	}
1da177e4	167
a8731cbf SW	168	static int dn_fib_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
a8731cbf SW	169	struct nlattr **tb)
1da177e4	170	{
a8731cbf SW	171	struct dn_fib_rule r = (struct dn_fib_rule )rule;
	172
	173	if (frh->src_len && (r->src_len != frh->src_len))
	174	return 0;
1da177e4	175
a8731cbf SW	176	if (frh->dst_len && (r->dst_len != frh->dst_len))
a8731cbf SW	177	return 0;
ecba320f	178
d1aa62f1	179	if (tb[FRA_SRC] && (r->src != nla_get_u16(tb[FRA_SRC])))
a8731cbf SW	180	return 0;
a8731cbf SW	181
d1aa62f1	182	if (tb[FRA_DST] && (r->dst != nla_get_u16(tb[FRA_DST])))
a8731cbf	183	return 0;
1da177e4	184
a8731cbf	185	return 1;
1da177e4 LT	186	}
1da177e4 LT	187
c4ea94ab	188	unsigned dnet_addr_type(__le16 addr)
1da177e4 LT	189	{
	190	struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
	191	struct dn_fib_res res;
	192	unsigned ret = RTN_UNICAST;
abcab268	193	struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
1da177e4 LT	194
	195	res.r = NULL;
	196
	197	if (tb) {
	198	if (!tb->lookup(tb, &fl, &res)) {
	199	ret = res.type;
	200	dn_fib_res_put(&res);
	201	}
	202	}
	203	return ret;
	204	}
	205
a8731cbf SW	206	static int dn_fib_rule_fill(struct fib_rule rule, struct sk_buff skb,
a8731cbf SW	207	struct nlmsghdr nlh, struct fib_rule_hdr frh)
1da177e4	208	{
a8731cbf	209	struct dn_fib_rule r = (struct dn_fib_rule )rule;
1da177e4	210
a8731cbf SW	211	frh->family = AF_DECnet;
	212	frh->dst_len = r->dst_len;
	213	frh->src_len = r->src_len;
	214	frh->tos = 0;
1da177e4	215
a8731cbf SW	216	if (r->dst_len)
	217	NLA_PUT_U16(skb, FRA_DST, r->dst);
	218	if (r->src_len)
	219	NLA_PUT_U16(skb, FRA_SRC, r->src);
1da177e4	220
a8731cbf	221	return 0;
1da177e4	222
a8731cbf SW	223	nla_put_failure:
a8731cbf SW	224	return -ENOBUFS;
1da177e4 LT	225	}
1da177e4 LT	226
a8731cbf	227	static u32 dn_fib_rule_default_pref(void)
1da177e4	228	{
a8731cbf SW	229	struct list_head *pos;
	230	struct fib_rule *rule;
	231
	232	if (!list_empty(&dn_fib_rules)) {
	233	pos = dn_fib_rules.next;
	234	if (pos->next != &dn_fib_rules) {
	235	rule = list_entry(pos->next, struct fib_rule, list);
	236	if (rule->pref)
	237	return rule->pref - 1;
	238	}
1da177e4 LT	239	}
1da177e4 LT	240
a8731cbf	241	return 0;
1da177e4 LT	242	}
	243
	244	int dn_fib_dump_rules(struct sk_buff skb, struct netlink_callback cb)
	245	{
a8731cbf	246	return fib_rules_dump(skb, cb, AF_DECnet);
1da177e4 LT	247	}
1da177e4 LT	248
a8731cbf SW	249	static struct fib_rules_ops dn_fib_rules_ops = {
	250	.family = AF_DECnet,
	251	.rule_size = sizeof(struct dn_fib_rule),
	252	.action = dn_fib_rule_action,
	253	.match = dn_fib_rule_match,
	254	.configure = dn_fib_rule_configure,
	255	.compare = dn_fib_rule_compare,
	256	.fill = dn_fib_rule_fill,
	257	.default_pref = dn_fib_rule_default_pref,
	258	.nlgroup = RTNLGRP_DECnet_RULE,
	259	.policy = dn_fib_rule_policy,
	260	.rules_list = &dn_fib_rules,
	261	.owner = THIS_MODULE,
	262	};
	263
1da177e4 LT	264	void __init dn_fib_rules_init(void)
1da177e4 LT	265	{
a8731cbf SW	266	list_add_tail(&default_rule.common.list, &dn_fib_rules);
a8731cbf SW	267	fib_rules_register(&dn_fib_rules_ops);
1da177e4 LT	268	}
	269
	270	void __exit dn_fib_rules_cleanup(void)
	271	{
a8731cbf	272	fib_rules_unregister(&dn_fib_rules_ops);
1da177e4 LT	273	}
	274
	275