[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
	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:
	14	* Steve Whitehouse <steve@chygwyn.com>
	15	* Updated for Thomas Graf's generic rules
	16	*
	17	*/
	18	#include <linux/net.h>
	19	#include <linux/init.h>
	20	#include <linux/netlink.h>
	21	#include <linux/rtnetlink.h>
	22	#include <linux/netdevice.h>
	23	#include <linux/spinlock.h>
	24	#include <linux/list.h>
	25	#include <linux/rcupdate.h>
	26	#include <net/neighbour.h>
	27	#include <net/dst.h>
	28	#include <net/flow.h>
	29	#include <net/fib_rules.h>
	30	#include <net/dn.h>
	31	#include <net/dn_fib.h>
	32	#include <net/dn_neigh.h>
	33	#include <net/dn_dev.h>
	34	#include <net/dn_route.h>
	35
	36	static struct fib_rules_ops *dn_fib_rules_ops;
	37
	38	struct dn_fib_rule
	39	{
	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;
	49	};
	50
	51
	52	int dn_fib_lookup(struct flowi flp, struct dn_fib_res res)
	53	{
	54	struct fib_lookup_arg arg = {
	55	.result = res,
	56	};
	57	int err;
	58
	59	err = fib_rules_lookup(dn_fib_rules_ops, flp, 0, &arg);
	60	res->r = arg.rule;
	61
	62	return err;
	63	}
	64
	65	static int dn_fib_rule_action(struct fib_rule rule, struct flowi flp,
	66	int flags, struct fib_lookup_arg *arg)
	67	{
	68	int err = -EAGAIN;
	69	struct dn_fib_table *tbl;
	70
	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;
	87	}
	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;
	98	}
	99
	100	static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = {
	101	FRA_GENERIC_POLICY,
	102	};
	103
	104	static int dn_fib_rule_match(struct fib_rule rule, struct flowi fl, int flags)
	105	{
	106	struct dn_fib_rule r = (struct dn_fib_rule )rule;
	107	__le16 daddr = fl->fld_dst;
	108	__le16 saddr = fl->fld_src;
	109
	110	if (((saddr ^ r->src) & r->srcmask) \|\|
	111	((daddr ^ r->dst) & r->dstmask))
	112	return 0;
	113
	114	return 1;
	115	}
	116
	117	static int dn_fib_rule_configure(struct fib_rule rule, struct sk_buff skb,
	118	struct fib_rule_hdr *frh,
	119	struct nlattr **tb)
	120	{
	121	int err = -EINVAL;
	122	struct dn_fib_rule r = (struct dn_fib_rule )rule;
	123
	124	if (frh->tos)
	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;
	138	}
	139	}
	140
	141	if (frh->src_len)
	142	r->src = nla_get_le16(tb[FRA_SRC]);
	143
	144	if (frh->dst_len)
	145	r->dst = nla_get_le16(tb[FRA_DST]);
	146
	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	}
	155
	156	static int dn_fib_rule_compare(struct fib_rule rule, struct fib_rule_hdr frh,
	157	struct nlattr **tb)
	158	{
	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;
	163
	164	if (frh->dst_len && (r->dst_len != frh->dst_len))
	165	return 0;
	166
	167	if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
	168	return 0;
	169
	170	if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
	171	return 0;
	172
	173	return 1;
	174	}
	175
	176	unsigned dnet_addr_type(__le16 addr)
	177	{
	178	struct flowi fl = { .fld_dst = addr };
	179	struct dn_fib_res res;
	180	unsigned ret = RTN_UNICAST;
	181	struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
	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
	194	static int dn_fib_rule_fill(struct fib_rule rule, struct sk_buff skb,
	195	struct fib_rule_hdr *frh)
	196	{
	197	struct dn_fib_rule r = (struct dn_fib_rule )rule;
	198
	199	frh->dst_len = r->dst_len;
	200	frh->src_len = r->src_len;
	201	frh->tos = 0;
	202
	203	if (r->dst_len)
	204	NLA_PUT_LE16(skb, FRA_DST, r->dst);
	205	if (r->src_len)
	206	NLA_PUT_LE16(skb, FRA_SRC, r->src);
	207
	208	return 0;
	209
	210	nla_put_failure:
	211	return -ENOBUFS;
	212	}
	213
	214	static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
	215	{
	216	dn_rt_cache_flush(-1);
	217	}
	218
	219	static const struct fib_rules_ops __net_initdata dn_fib_rules_ops_template = {
	220	.family = AF_DECnet,
	221	.rule_size = sizeof(struct dn_fib_rule),
	222	.addr_size = sizeof(u16),
	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,
	228	.default_pref = fib_default_rule_pref,
	229	.flush_cache = dn_fib_rule_flush_cache,
	230	.nlgroup = RTNLGRP_DECnet_RULE,
	231	.policy = dn_fib_rule_policy,
	232	.owner = THIS_MODULE,
	233	.fro_net = &init_net,
	234	};
	235
	236	void __init dn_fib_rules_init(void)
	237	{
	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,
	242	RT_TABLE_MAIN, 0));
	243	}
	244
	245	void __exit dn_fib_rules_cleanup(void)
	246	{
	247	fib_rules_unregister(dn_fib_rules_ops);
	248	rcu_barrier();
	249	}
	250
	251