[mirror_ubuntu-bionic-kernel.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 <linux/idr.h>
#include <net/netlink.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>

struct basic_head {
	struct list_head	flist;
	struct idr		handle_idr;
	struct rcu_head		rcu;
};

struct basic_filter {
	u32			handle;
	struct tcf_exts		exts;
	struct tcf_ematch_tree	ematches;
	struct tcf_result	res;
	struct tcf_proto	*tp;
	struct list_head	link;
	struct rcu_work		rwork;
};

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

	list_for_each_entry_rcu(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 void *basic_get(struct tcf_proto *tp, u32 handle)
{
	struct basic_head *head = rtnl_dereference(tp->root);
	struct basic_filter *f;

	list_for_each_entry(f, &head->flist, link) {
		if (f->handle == handle) {
			return f;
		}
	}

	return NULL;
}

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);
	idr_init(&head->handle_idr);
	rcu_assign_pointer(tp->root, head);
	return 0;
}

static void __basic_delete_filter(struct basic_filter *f)
{
	tcf_exts_destroy(&f->exts);
	tcf_em_tree_destroy(&f->ematches);
	tcf_exts_put_net(&f->exts);
	kfree(f);
}

static void basic_delete_filter_work(struct work_struct *work)
{
	struct basic_filter *f = container_of(to_rcu_work(work),
					      struct basic_filter,
					      rwork);
	rtnl_lock();
	__basic_delete_filter(f);
	rtnl_unlock();
}

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

	list_for_each_entry_safe(f, n, &head->flist, link) {
		list_del_rcu(&f->link);
		tcf_unbind_filter(tp, &f->res);
		idr_remove_ext(&head->handle_idr, f->handle);
		if (tcf_exts_get_net(&f->exts))
			tcf_queue_work(&f->rwork, basic_delete_filter_work);
		else
			__basic_delete_filter(f);
	}
	idr_destroy(&head->handle_idr);
	kfree_rcu(head, rcu);
}

static int basic_delete(struct tcf_proto *tp, void *arg, bool *last)
{
	struct basic_head *head = rtnl_dereference(tp->root);
	struct basic_filter *f = arg;

	list_del_rcu(&f->link);
	tcf_unbind_filter(tp, &f->res);
	idr_remove_ext(&head->handle_idr, f->handle);
	tcf_exts_get_net(&f->exts);
	tcf_queue_work(&f->rwork, basic_delete_filter_work);
	*last = list_empty(&head->flist);
	return 0;
}

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

static int basic_set_parms(struct net *net, struct tcf_proto *tp,
			   struct basic_filter *f, unsigned long base,
			   struct nlattr **tb,
			   struct nlattr *est, bool ovr)
{
	int err;

	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr);
	if (err < 0)
		return err;

	err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches);
	if (err < 0)
		return err;

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

	f->tp = tp;
	return 0;
}

static int basic_change(struct net *net, struct sk_buff *in_skb,
			struct tcf_proto *tp, unsigned long base, u32 handle,
			struct nlattr **tca, void **arg, bool ovr)
{
	int err;
	struct basic_head *head = rtnl_dereference(tp->root);
	struct nlattr *tb[TCA_BASIC_MAX + 1];
	struct basic_filter *fold = (struct basic_filter *) *arg;
	struct basic_filter *fnew;
	unsigned long idr_index;

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

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

	if (fold != NULL) {
		if (handle && fold->handle != handle)
			return -EINVAL;
	}

	fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
	if (!fnew)
		return -ENOBUFS;

	err = tcf_exts_init(&fnew->exts, net, TCA_BASIC_ACT, TCA_BASIC_POLICE);
	if (err < 0)
		goto errout;

	if (handle) {
		fnew->handle = handle;
		if (!fold) {
			err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
					    handle, handle + 1, GFP_KERNEL);
			if (err)
				goto errout;
		}
	} else {
		err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
				    1, 0x7FFFFFFF, GFP_KERNEL);
		if (err)
			goto errout;
		fnew->handle = idr_index;
	}

	err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr);
	if (err < 0) {
		if (!fold)
			idr_remove_ext(&head->handle_idr, fnew->handle);
		goto errout;
	}

	*arg = fnew;

	if (fold) {
		idr_replace_ext(&head->handle_idr, fnew, fnew->handle);
		list_replace_rcu(&fold->link, &fnew->link);
		tcf_unbind_filter(tp, &fold->res);
		tcf_exts_get_net(&fold->exts);
		tcf_queue_work(&fold->rwork, basic_delete_filter_work);
	} else {
		list_add_rcu(&fnew->link, &head->flist);
	}

	return 0;
errout:
	tcf_exts_destroy(&fnew->exts);
	kfree(fnew);
	return err;
}

static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg)
{
	struct basic_head *head = rtnl_dereference(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, f, arg) < 0) {
			arg->stop = 1;
			break;
		}
skip:
		arg->count++;
	}
}

static void basic_bind_class(void *fh, u32 classid, unsigned long cl)
{
	struct basic_filter *f = fh;

	if (f && f->res.classid == classid)
		f->res.class = cl;
}

static int basic_dump(struct net *net, struct tcf_proto *tp, void *fh,
		      struct sk_buff *skb, struct tcmsg *t)
{
	struct basic_filter *f = 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))
		goto nla_put_failure;

	if (tcf_exts_dump(skb, &f->exts) < 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) < 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,
	.change		=	basic_change,
	.delete		=	basic_delete,
	.walk		=	basic_walk,
	.dump		=	basic_dump,
	.bind_class	=	basic_bind_class,
	.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>
1d8134fe	20	#include <linux/idr.h>
dc5fc579	21	#include <net/netlink.h>
1da177e4 LT	22	#include <net/act_api.h>
	23	#include <net/pkt_cls.h>
	24
cc7ec456	25	struct basic_head {
1da177e4	26	struct list_head flist;
1d8134fe	27	struct idr handle_idr;
9888faef	28	struct rcu_head rcu;
1da177e4 LT	29	};
1da177e4 LT	30
cc7ec456	31	struct basic_filter {
1da177e4 LT	32	u32 handle;
	33	struct tcf_exts exts;
	34	struct tcf_ematch_tree ematches;
	35	struct tcf_result res;
9888faef	36	struct tcf_proto *tp;
1da177e4	37	struct list_head link;
7afe8e4f	38	struct rcu_work rwork;
1da177e4 LT	39	};
1da177e4 LT	40
dc7f9f6e	41	static int basic_classify(struct sk_buff skb, const struct tcf_proto tp,
1da177e4 LT	42	struct tcf_result *res)
	43	{
	44	int r;
9888faef	45	struct basic_head *head = rcu_dereference_bh(tp->root);
1da177e4 LT	46	struct basic_filter *f;
1da177e4 LT	47
9888faef	48	list_for_each_entry_rcu(f, &head->flist, link) {
1da177e4 LT	49	if (!tcf_em_tree_match(skb, &f->ematches, NULL))
	50	continue;
	51	*res = f->res;
	52	r = tcf_exts_exec(skb, &f->exts, res);
	53	if (r < 0)
	54	continue;
	55	return r;
	56	}
	57	return -1;
	58	}
	59
8113c095	60	static void basic_get(struct tcf_proto tp, u32 handle)
1da177e4	61	{
9888faef	62	struct basic_head *head = rtnl_dereference(tp->root);
1da177e4 LT	63	struct basic_filter *f;
1da177e4 LT	64
1c1bc6bd DB	65	list_for_each_entry(f, &head->flist, link) {
1c1bc6bd DB	66	if (f->handle == handle) {
8113c095	67	return f;
1c1bc6bd DB	68	}
1c1bc6bd DB	69	}
1da177e4	70
8113c095	71	return NULL;
1da177e4 LT	72	}
1da177e4 LT	73
1da177e4 LT	74	static int basic_init(struct tcf_proto *tp)
1da177e4 LT	75	{
d3fa76ee PM	76	struct basic_head *head;
	77
	78	head = kzalloc(sizeof(*head), GFP_KERNEL);
	79	if (head == NULL)
	80	return -ENOBUFS;
	81	INIT_LIST_HEAD(&head->flist);
1d8134fe	82	idr_init(&head->handle_idr);
9888faef	83	rcu_assign_pointer(tp->root, head);
1da177e4 LT	84	return 0;
	85	}
	86
0b2a5989 CW	87	static void __basic_delete_filter(struct basic_filter *f)
	88	{
	89	tcf_exts_destroy(&f->exts);
	90	tcf_em_tree_destroy(&f->ematches);
	91	tcf_exts_put_net(&f->exts);
	92	kfree(f);
	93	}
	94
c96a4838	95	static void basic_delete_filter_work(struct work_struct *work)
1da177e4	96	{
7afe8e4f CW	97	struct basic_filter *f = container_of(to_rcu_work(work),
	98	struct basic_filter,
	99	rwork);
c96a4838	100	rtnl_lock();
0b2a5989	101	__basic_delete_filter(f);
c96a4838	102	rtnl_unlock();
1da177e4 LT	103	}
1da177e4 LT	104
763dbf63	105	static void basic_destroy(struct tcf_proto *tp)
1da177e4	106	{
9888faef	107	struct basic_head *head = rtnl_dereference(tp->root);
1da177e4	108	struct basic_filter f, n;
10297b99	109
1da177e4	110	list_for_each_entry_safe(f, n, &head->flist, link) {
9888faef	111	list_del_rcu(&f->link);
18cdb37e	112	tcf_unbind_filter(tp, &f->res);
1d8134fe	113	idr_remove_ext(&head->handle_idr, f->handle);
0b2a5989	114	if (tcf_exts_get_net(&f->exts))
7afe8e4f	115	tcf_queue_work(&f->rwork, basic_delete_filter_work);
0b2a5989 CW	116	else
0b2a5989 CW	117	__basic_delete_filter(f);
1da177e4	118	}
1d8134fe	119	idr_destroy(&head->handle_idr);
9888faef	120	kfree_rcu(head, rcu);
1da177e4 LT	121	}
1da177e4 LT	122
8113c095	123	static int basic_delete(struct tcf_proto tp, void arg, bool *last)
1da177e4	124	{
763dbf63	125	struct basic_head *head = rtnl_dereference(tp->root);
8113c095	126	struct basic_filter *f = arg;
1da177e4	127
e4386456 JP	128	list_del_rcu(&f->link);
e4386456 JP	129	tcf_unbind_filter(tp, &f->res);
1d8134fe	130	idr_remove_ext(&head->handle_idr, f->handle);
0b2a5989	131	tcf_exts_get_net(&f->exts);
7afe8e4f	132	tcf_queue_work(&f->rwork, basic_delete_filter_work);
763dbf63	133	*last = list_empty(&head->flist);
e4386456	134	return 0;
1da177e4 LT	135	}
1da177e4 LT	136
6fa8c014 PM	137	static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = {
	138	[TCA_BASIC_CLASSID] = { .type = NLA_U32 },
	139	[TCA_BASIC_EMATCHES] = { .type = NLA_NESTED },
	140	};
	141
c1b52739 BL	142	static int basic_set_parms(struct net net, struct tcf_proto tp,
	143	struct basic_filter *f, unsigned long base,
	144	struct nlattr **tb,
2f7ef2f8	145	struct nlattr *est, bool ovr)
1da177e4	146	{
6459082a	147	int err;
1da177e4	148
ff1f8ca0	149	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr);
1da177e4 LT	150	if (err < 0)
	151	return err;
	152
4ebc1e3c	153	err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches);
1da177e4	154	if (err < 0)
ff1f8ca0	155	return err;
1da177e4	156
add93b61	157	if (tb[TCA_BASIC_CLASSID]) {
1587bac4	158	f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
1da177e4 LT	159	tcf_bind_filter(tp, &f->res, base);
	160	}
	161
9888faef	162	f->tp = tp;
1da177e4	163	return 0;
1da177e4 LT	164	}
1da177e4 LT	165
c1b52739	166	static int basic_change(struct net net, struct sk_buff in_skb,
af4c6641	167	struct tcf_proto *tp, unsigned long base, u32 handle,
8113c095	168	struct nlattr tca, void arg, bool ovr)
1da177e4	169	{
cee63723	170	int err;
9888faef	171	struct basic_head *head = rtnl_dereference(tp->root);
add93b61	172	struct nlattr *tb[TCA_BASIC_MAX + 1];
9888faef JF	173	struct basic_filter fold = (struct basic_filter ) *arg;
9888faef JF	174	struct basic_filter *fnew;
1d8134fe	175	unsigned long idr_index;
1da177e4	176
add93b61	177	if (tca[TCA_OPTIONS] == NULL)
1da177e4 LT	178	return -EINVAL;
1da177e4 LT	179
6fa8c014	180	err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS],
fceb6435	181	basic_policy, NULL);
cee63723 PM	182	if (err < 0)
cee63723 PM	183	return err;
1da177e4	184
9888faef JF	185	if (fold != NULL) {
9888faef JF	186	if (handle && fold->handle != handle)
1da177e4	187	return -EINVAL;
1da177e4 LT	188	}
1da177e4 LT	189
9888faef	190	fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
bd42b788 JP	191	if (!fnew)
bd42b788 JP	192	return -ENOBUFS;
1da177e4	193
fb6ad63b	194	err = tcf_exts_init(&fnew->exts, net, TCA_BASIC_ACT, TCA_BASIC_POLICE);
b9a24bb7 WC	195	if (err < 0)
	196	goto errout;
	197
9888faef JF	198	if (handle) {
9888faef JF	199	fnew->handle = handle;
1d8134fe CW	200	if (!fold) {
	201	err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
	202	handle, handle + 1, GFP_KERNEL);
	203	if (err)
	204	goto errout;
	205	}
9888faef	206	} else {
1d8134fe CW	207	err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
	208	1, 0x7FFFFFFF, GFP_KERNEL);
	209	if (err)
1da177e4	210	goto errout;
1d8134fe	211	fnew->handle = idr_index;
1da177e4 LT	212	}
1da177e4 LT	213
9888faef	214	err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr);
1d8134fe CW	215	if (err < 0) {
	216	if (!fold)
	217	idr_remove_ext(&head->handle_idr, fnew->handle);
1da177e4	218	goto errout;
1d8134fe	219	}
1da177e4	220
8113c095	221	*arg = fnew;
9888faef JF	222
9888faef JF	223	if (fold) {
1d8134fe	224	idr_replace_ext(&head->handle_idr, fnew, fnew->handle);
9888faef	225	list_replace_rcu(&fold->link, &fnew->link);
18cdb37e	226	tcf_unbind_filter(tp, &fold->res);
0b2a5989	227	tcf_exts_get_net(&fold->exts);
7afe8e4f	228	tcf_queue_work(&fold->rwork, basic_delete_filter_work);
9888faef JF	229	} else {
	230	list_add_rcu(&fnew->link, &head->flist);
	231	}
1da177e4 LT	232
	233	return 0;
	234	errout:
b9a24bb7	235	tcf_exts_destroy(&fnew->exts);
9888faef	236	kfree(fnew);
1da177e4 LT	237	return err;
	238	}
	239
	240	static void basic_walk(struct tcf_proto tp, struct tcf_walker arg)
	241	{
9888faef	242	struct basic_head *head = rtnl_dereference(tp->root);
1da177e4 LT	243	struct basic_filter *f;
	244
	245	list_for_each_entry(f, &head->flist, link) {
	246	if (arg->count < arg->skip)
	247	goto skip;
	248
8113c095	249	if (arg->fn(tp, f, arg) < 0) {
1da177e4 LT	250	arg->stop = 1;
	251	break;
	252	}
	253	skip:
	254	arg->count++;
	255	}
	256	}
	257
07d79fc7 CW	258	static void basic_bind_class(void *fh, u32 classid, unsigned long cl)
	259	{
	260	struct basic_filter *f = fh;
	261
	262	if (f && f->res.classid == classid)
	263	f->res.class = cl;
	264	}
	265
8113c095	266	static int basic_dump(struct net net, struct tcf_proto tp, void *fh,
1da177e4 LT	267	struct sk_buff skb, struct tcmsg t)
1da177e4 LT	268	{
8113c095	269	struct basic_filter *f = fh;
4b3550ef	270	struct nlattr *nest;
1da177e4 LT	271
	272	if (f == NULL)
	273	return skb->len;
	274
	275	t->tcm_handle = f->handle;
	276
4b3550ef PM	277	nest = nla_nest_start(skb, TCA_OPTIONS);
	278	if (nest == NULL)
	279	goto nla_put_failure;
1da177e4	280
1b34ec43 DM	281	if (f->res.classid &&
	282	nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid))
	283	goto nla_put_failure;
e1e284a4	284
5da57f42	285	if (tcf_exts_dump(skb, &f->exts) < 0 \|\|
1da177e4	286	tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0)
add93b61	287	goto nla_put_failure;
1da177e4	288
4b3550ef	289	nla_nest_end(skb, nest);
4c46ee52	290
5da57f42	291	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
4c46ee52	292	goto nla_put_failure;
4c46ee52	293
1da177e4 LT	294	return skb->len;
1da177e4 LT	295
add93b61	296	nla_put_failure:
4b3550ef	297	nla_nest_cancel(skb, nest);
1da177e4 LT	298	return -1;
	299	}
	300
2eb9d75c	301	static struct tcf_proto_ops cls_basic_ops __read_mostly = {
1da177e4 LT	302	.kind = "basic",
	303	.classify = basic_classify,
	304	.init = basic_init,
	305	.destroy = basic_destroy,
	306	.get = basic_get,
1da177e4 LT	307	.change = basic_change,
	308	.delete = basic_delete,
	309	.walk = basic_walk,
	310	.dump = basic_dump,
07d79fc7	311	.bind_class = basic_bind_class,
1da177e4 LT	312	.owner = THIS_MODULE,
	313	};
	314
	315	static int __init init_basic(void)
	316	{
	317	return register_tcf_proto_ops(&cls_basic_ops);
	318	}
	319
10297b99	320	static void __exit exit_basic(void)
1da177e4 LT	321	{
	322	unregister_tcf_proto_ops(&cls_basic_ops);
	323	}
	324
	325	module_init(init_basic)
	326	module_exit(exit_basic)
	327	MODULE_LICENSE("GPL");
	328