[net-next-2.6.git] / net / sched / cls_basic.c

/*
 * net/sched/cls_basic.c	Basic Packet Classifier.
 *
 *		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; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Authors:	Thomas Graf <tgraf@suug.ch>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>

struct basic_head
{
	u32			hgenerator;
	struct list_head	flist;
};

struct basic_filter
{
	u32			handle;
	struct tcf_exts		exts;
	struct tcf_ematch_tree	ematches;
	struct tcf_result	res;
	struct list_head	link;
};

static const struct tcf_ext_map basic_ext_map = {
	.action = TCA_BASIC_ACT,
	.police = TCA_BASIC_POLICE
};

static int basic_classify(struct sk_buff *skb, struct tcf_proto *tp,
			  struct tcf_result *res)
{
	int r;
	struct basic_head *head = (struct basic_head *) tp->root;
	struct basic_filter *f;

	list_for_each_entry(f, &head->flist, link) {
		if (!tcf_em_tree_match(skb, &f->ematches, NULL))
			continue;
		*res = f->res;
		r = tcf_exts_exec(skb, &f->exts, res);
		if (r < 0)
			continue;
		return r;
	}
	return -1;
}

static unsigned long basic_get(struct tcf_proto *tp, u32 handle)
{
	unsigned long l = 0UL;
	struct basic_head *head = (struct basic_head *) tp->root;
	struct basic_filter *f;

	if (head == NULL)
		return 0UL;

	list_for_each_entry(f, &head->flist, link)
		if (f->handle == handle)
			l = (unsigned long) f;

	return l;
}

static void basic_put(struct tcf_proto *tp, unsigned long f)
{
}

static int basic_init(struct tcf_proto *tp)
{
	struct basic_head *head;

	head = kzalloc(sizeof(*head), GFP_KERNEL);
	if (head == NULL)
		return -ENOBUFS;
	INIT_LIST_HEAD(&head->flist);
	tp->root = head;
	return 0;
}

static inline void basic_delete_filter(struct tcf_proto *tp,
				       struct basic_filter *f)
{
	tcf_unbind_filter(tp, &f->res);
	tcf_exts_destroy(tp, &f->exts);
	tcf_em_tree_destroy(tp, &f->ematches);
	kfree(f);
}

static void basic_destroy(struct tcf_proto *tp)
{
	struct basic_head *head = tp->root;
	struct basic_filter *f, *n;

	list_for_each_entry_safe(f, n, &head->flist, link) {
		list_del(&f->link);
		basic_delete_filter(tp, f);
	}
	kfree(head);
}

static int basic_delete(struct tcf_proto *tp, unsigned long arg)
{
	struct basic_head *head = (struct basic_head *) tp->root;
	struct basic_filter *t, *f = (struct basic_filter *) arg;

	list_for_each_entry(t, &head->flist, link)
		if (t == f) {
			tcf_tree_lock(tp);
			list_del(&t->link);
			tcf_tree_unlock(tp);
			basic_delete_filter(tp, t);
			return 0;
		}

	return -ENOENT;
}

static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = {
	[TCA_BASIC_CLASSID]	= { .type = NLA_U32 },
	[TCA_BASIC_EMATCHES]	= { .type = NLA_NESTED },
};

static inline int basic_set_parms(struct tcf_proto *tp, struct basic_filter *f,
				  unsigned long base, struct nlattr **tb,
				  struct nlattr *est)
{
	int err = -EINVAL;
	struct tcf_exts e;
	struct tcf_ematch_tree t;

	err = tcf_exts_validate(tp, tb, est, &e, &basic_ext_map);
	if (err < 0)
		return err;

	err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t);
	if (err < 0)
		goto errout;

	if (tb[TCA_BASIC_CLASSID]) {
		f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
		tcf_bind_filter(tp, &f->res, base);
	}

	tcf_exts_change(tp, &f->exts, &e);
	tcf_em_tree_change(tp, &f->ematches, &t);

	return 0;
errout:
	tcf_exts_destroy(tp, &e);
	return err;
}

static int basic_change(struct tcf_proto *tp, unsigned long base, u32 handle,
			struct nlattr **tca, unsigned long *arg)
{
	int err;
	struct basic_head *head = (struct basic_head *) tp->root;
	struct nlattr *tb[TCA_BASIC_MAX + 1];
	struct basic_filter *f = (struct basic_filter *) *arg;

	if (tca[TCA_OPTIONS] == NULL)
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS],
			       basic_policy);
	if (err < 0)
		return err;

	if (f != NULL) {
		if (handle && f->handle != handle)
			return -EINVAL;
		return basic_set_parms(tp, f, base, tb, tca[TCA_RATE]);
	}

	err = -ENOBUFS;
	f = kzalloc(sizeof(*f), GFP_KERNEL);
	if (f == NULL)
		goto errout;

	err = -EINVAL;
	if (handle)
		f->handle = handle;
	else {
		unsigned int i = 0x80000000;
		do {
			if (++head->hgenerator == 0x7FFFFFFF)
				head->hgenerator = 1;
		} while (--i > 0 && basic_get(tp, head->hgenerator));

		if (i <= 0) {
			printk(KERN_ERR "Insufficient number of handles\n");
			goto errout;
		}

		f->handle = head->hgenerator;
	}

	err = basic_set_parms(tp, f, base, tb, tca[TCA_RATE]);
	if (err < 0)
		goto errout;

	tcf_tree_lock(tp);
	list_add(&f->link, &head->flist);
	tcf_tree_unlock(tp);
	*arg = (unsigned long) f;

	return 0;
errout:
	if (*arg == 0UL && f)
		kfree(f);

	return err;
}

static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg)
{
	struct basic_head *head = (struct basic_head *) tp->root;
	struct basic_filter *f;

	list_for_each_entry(f, &head->flist, link) {
		if (arg->count < arg->skip)
			goto skip;

		if (arg->fn(tp, (unsigned long) f, arg) < 0) {
			arg->stop = 1;
			break;
		}
skip:
		arg->count++;
	}
}

static int basic_dump(struct tcf_proto *tp, unsigned long fh,
		      struct sk_buff *skb, struct tcmsg *t)
{
	struct basic_filter *f = (struct basic_filter *) fh;
	struct nlattr *nest;

	if (f == NULL)
		return skb->len;

	t->tcm_handle = f->handle;

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;

	if (f->res.classid)
		NLA_PUT_U32(skb, TCA_BASIC_CLASSID, f->res.classid);

	if (tcf_exts_dump(skb, &f->exts, &basic_ext_map) < 0 ||
	    tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0)
		goto nla_put_failure;

	nla_nest_end(skb, nest);

	if (tcf_exts_dump_stats(skb, &f->exts, &basic_ext_map) < 0)
		goto nla_put_failure;

	return skb->len;

nla_put_failure:
	nla_nest_cancel(skb, nest);
	return -1;
}

static struct tcf_proto_ops cls_basic_ops __read_mostly = {
	.kind		=	"basic",
	.classify	=	basic_classify,
	.init		=	basic_init,
	.destroy	=	basic_destroy,
	.get		=	basic_get,
	.put		=	basic_put,
	.change		=	basic_change,
	.delete		=	basic_delete,
	.walk		=	basic_walk,
	.dump		=	basic_dump,
	.owner		=	THIS_MODULE,
};

static int __init init_basic(void)
{
	return register_tcf_proto_ops(&cls_basic_ops);
}

static void __exit exit_basic(void)
{
	unregister_tcf_proto_ops(&cls_basic_ops);
}

module_init(init_basic)
module_exit(exit_basic)
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* net/sched/cls_basic.c Basic Packet Classifier.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Thomas Graf <tgraf@suug.ch>
	10	*/
	11
1da177e4	12	#include <linux/module.h>
5a0e3ad6	13	#include <linux/slab.h>
1da177e4 LT	14	#include <linux/types.h>
1da177e4 LT	15	#include <linux/kernel.h>
1da177e4	16	#include <linux/string.h>
1da177e4 LT	17	#include <linux/errno.h>
	18	#include <linux/rtnetlink.h>
	19	#include <linux/skbuff.h>
dc5fc579	20	#include <net/netlink.h>
1da177e4 LT	21	#include <net/act_api.h>
	22	#include <net/pkt_cls.h>
	23
	24	struct basic_head
	25	{
	26	u32 hgenerator;
	27	struct list_head flist;
	28	};
	29
	30	struct basic_filter
	31	{
	32	u32 handle;
	33	struct tcf_exts exts;
	34	struct tcf_ematch_tree ematches;
	35	struct tcf_result res;
	36	struct list_head link;
	37	};
	38
5239008b	39	static const struct tcf_ext_map basic_ext_map = {
1da177e4 LT	40	.action = TCA_BASIC_ACT,
	41	.police = TCA_BASIC_POLICE
	42	};
	43
	44	static int basic_classify(struct sk_buff skb, struct tcf_proto tp,
	45	struct tcf_result *res)
	46	{
	47	int r;
	48	struct basic_head head = (struct basic_head ) tp->root;
	49	struct basic_filter *f;
	50
	51	list_for_each_entry(f, &head->flist, link) {
	52	if (!tcf_em_tree_match(skb, &f->ematches, NULL))
	53	continue;
	54	*res = f->res;
	55	r = tcf_exts_exec(skb, &f->exts, res);
	56	if (r < 0)
	57	continue;
	58	return r;
	59	}
	60	return -1;
	61	}
	62
	63	static unsigned long basic_get(struct tcf_proto *tp, u32 handle)
	64	{
	65	unsigned long l = 0UL;
	66	struct basic_head head = (struct basic_head ) tp->root;
	67	struct basic_filter *f;
	68
	69	if (head == NULL)
	70	return 0UL;
	71
	72	list_for_each_entry(f, &head->flist, link)
	73	if (f->handle == handle)
	74	l = (unsigned long) f;
	75
	76	return l;
	77	}
	78
	79	static void basic_put(struct tcf_proto *tp, unsigned long f)
	80	{
	81	}
	82
	83	static int basic_init(struct tcf_proto *tp)
	84	{
d3fa76ee PM	85	struct basic_head *head;
	86
	87	head = kzalloc(sizeof(*head), GFP_KERNEL);
	88	if (head == NULL)
	89	return -ENOBUFS;
	90	INIT_LIST_HEAD(&head->flist);
	91	tp->root = head;
1da177e4 LT	92	return 0;
	93	}
	94
	95	static inline void basic_delete_filter(struct tcf_proto *tp,
	96	struct basic_filter *f)
	97	{
	98	tcf_unbind_filter(tp, &f->res);
	99	tcf_exts_destroy(tp, &f->exts);
	100	tcf_em_tree_destroy(tp, &f->ematches);
	101	kfree(f);
	102	}
	103
	104	static void basic_destroy(struct tcf_proto *tp)
	105	{
47a1a1d4	106	struct basic_head *head = tp->root;
1da177e4	107	struct basic_filter f, n;
10297b99	108
1da177e4 LT	109	list_for_each_entry_safe(f, n, &head->flist, link) {
	110	list_del(&f->link);
	111	basic_delete_filter(tp, f);
	112	}
31ba548f	113	kfree(head);
1da177e4 LT	114	}
	115
	116	static int basic_delete(struct tcf_proto *tp, unsigned long arg)
	117	{
	118	struct basic_head head = (struct basic_head ) tp->root;
	119	struct basic_filter t, f = (struct basic_filter *) arg;
	120
	121	list_for_each_entry(t, &head->flist, link)
	122	if (t == f) {
	123	tcf_tree_lock(tp);
	124	list_del(&t->link);
	125	tcf_tree_unlock(tp);
	126	basic_delete_filter(tp, t);
	127	return 0;
	128	}
	129
	130	return -ENOENT;
	131	}
	132
6fa8c014 PM	133	static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = {
	134	[TCA_BASIC_CLASSID] = { .type = NLA_U32 },
	135	[TCA_BASIC_EMATCHES] = { .type = NLA_NESTED },
	136	};
	137
1da177e4	138	static inline int basic_set_parms(struct tcf_proto tp, struct basic_filter f,
add93b61 PM	139	unsigned long base, struct nlattr **tb,
add93b61 PM	140	struct nlattr *est)
1da177e4 LT	141	{
	142	int err = -EINVAL;
	143	struct tcf_exts e;
	144	struct tcf_ematch_tree t;
	145
1da177e4 LT	146	err = tcf_exts_validate(tp, tb, est, &e, &basic_ext_map);
	147	if (err < 0)
	148	return err;
	149
add93b61	150	err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t);
1da177e4 LT	151	if (err < 0)
	152	goto errout;
	153
add93b61	154	if (tb[TCA_BASIC_CLASSID]) {
1587bac4	155	f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
1da177e4 LT	156	tcf_bind_filter(tp, &f->res, base);
	157	}
	158
	159	tcf_exts_change(tp, &f->exts, &e);
	160	tcf_em_tree_change(tp, &f->ematches, &t);
	161
	162	return 0;
	163	errout:
	164	tcf_exts_destroy(tp, &e);
	165	return err;
	166	}
	167
	168	static int basic_change(struct tcf_proto *tp, unsigned long base, u32 handle,
add93b61	169	struct nlattr *tca, unsigned long arg)
1da177e4	170	{
cee63723	171	int err;
1da177e4	172	struct basic_head head = (struct basic_head ) tp->root;
add93b61	173	struct nlattr *tb[TCA_BASIC_MAX + 1];
1da177e4 LT	174	struct basic_filter f = (struct basic_filter ) *arg;
1da177e4 LT	175
add93b61	176	if (tca[TCA_OPTIONS] == NULL)
1da177e4 LT	177	return -EINVAL;
1da177e4 LT	178
6fa8c014 PM	179	err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS],
6fa8c014 PM	180	basic_policy);
cee63723 PM	181	if (err < 0)
cee63723 PM	182	return err;
1da177e4 LT	183
	184	if (f != NULL) {
	185	if (handle && f->handle != handle)
	186	return -EINVAL;
add93b61	187	return basic_set_parms(tp, f, base, tb, tca[TCA_RATE]);
1da177e4 LT	188	}
	189
	190	err = -ENOBUFS;
0da974f4	191	f = kzalloc(sizeof(*f), GFP_KERNEL);
1da177e4 LT	192	if (f == NULL)
1da177e4 LT	193	goto errout;
1da177e4 LT	194
	195	err = -EINVAL;
	196	if (handle)
	197	f->handle = handle;
	198	else {
658270a0	199	unsigned int i = 0x80000000;
1da177e4 LT	200	do {
	201	if (++head->hgenerator == 0x7FFFFFFF)
	202	head->hgenerator = 1;
	203	} while (--i > 0 && basic_get(tp, head->hgenerator));
	204
	205	if (i <= 0) {
	206	printk(KERN_ERR "Insufficient number of handles\n");
	207	goto errout;
	208	}
	209
	210	f->handle = head->hgenerator;
	211	}
	212
add93b61	213	err = basic_set_parms(tp, f, base, tb, tca[TCA_RATE]);
1da177e4 LT	214	if (err < 0)
	215	goto errout;
	216
	217	tcf_tree_lock(tp);
	218	list_add(&f->link, &head->flist);
	219	tcf_tree_unlock(tp);
	220	*arg = (unsigned long) f;
	221
	222	return 0;
	223	errout:
	224	if (*arg == 0UL && f)
	225	kfree(f);
	226
	227	return err;
	228	}
	229
	230	static void basic_walk(struct tcf_proto tp, struct tcf_walker arg)
	231	{
	232	struct basic_head head = (struct basic_head ) tp->root;
	233	struct basic_filter *f;
	234
	235	list_for_each_entry(f, &head->flist, link) {
	236	if (arg->count < arg->skip)
	237	goto skip;
	238
	239	if (arg->fn(tp, (unsigned long) f, arg) < 0) {
	240	arg->stop = 1;
	241	break;
	242	}
	243	skip:
	244	arg->count++;
	245	}
	246	}
	247
	248	static int basic_dump(struct tcf_proto *tp, unsigned long fh,
	249	struct sk_buff skb, struct tcmsg t)
	250	{
	251	struct basic_filter f = (struct basic_filter ) fh;
4b3550ef	252	struct nlattr *nest;
1da177e4 LT	253
	254	if (f == NULL)
	255	return skb->len;
	256
	257	t->tcm_handle = f->handle;
	258
4b3550ef PM	259	nest = nla_nest_start(skb, TCA_OPTIONS);
	260	if (nest == NULL)
	261	goto nla_put_failure;
1da177e4	262
e1e284a4	263	if (f->res.classid)
24beeab5	264	NLA_PUT_U32(skb, TCA_BASIC_CLASSID, f->res.classid);
e1e284a4	265
1da177e4 LT	266	if (tcf_exts_dump(skb, &f->exts, &basic_ext_map) < 0 \|\|
1da177e4 LT	267	tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0)
add93b61	268	goto nla_put_failure;
1da177e4	269
4b3550ef	270	nla_nest_end(skb, nest);
4c46ee52	271
	272	if (tcf_exts_dump_stats(skb, &f->exts, &basic_ext_map) < 0)
	273	goto nla_put_failure;
	274
1da177e4 LT	275	return skb->len;
1da177e4 LT	276
add93b61	277	nla_put_failure:
4b3550ef	278	nla_nest_cancel(skb, nest);
1da177e4 LT	279	return -1;
	280	}
	281
2eb9d75c	282	static struct tcf_proto_ops cls_basic_ops __read_mostly = {
1da177e4 LT	283	.kind = "basic",
	284	.classify = basic_classify,
	285	.init = basic_init,
	286	.destroy = basic_destroy,
	287	.get = basic_get,
	288	.put = basic_put,
	289	.change = basic_change,
	290	.delete = basic_delete,
	291	.walk = basic_walk,
	292	.dump = basic_dump,
	293	.owner = THIS_MODULE,
	294	};
	295
	296	static int __init init_basic(void)
	297	{
	298	return register_tcf_proto_ops(&cls_basic_ops);
	299	}
	300
10297b99	301	static void __exit exit_basic(void)
1da177e4 LT	302	{
	303	unregister_tcf_proto_ops(&cls_basic_ops);
	304	}
	305
	306	module_init(init_basic)
	307	module_exit(exit_basic)
	308	MODULE_LICENSE("GPL");
	309