[mirror_ubuntu-bionic-kernel.git] / net / sched / act_simple.c

/*
 * net/sched/simp.c	Simple example of an action
 *
 *		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:	Jamal Hadi Salim (2005)
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>

#define TCA_ACT_SIMP 22

#include <linux/tc_act/tc_defact.h>
#include <net/tc_act/tc_defact.h>

#define SIMP_TAB_MASK     7
static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
static u32 simp_idx_gen;
static DEFINE_RWLOCK(simp_lock);

static struct tcf_hashinfo simp_hash_info = {
	.htab	=	tcf_simp_ht,
	.hmask	=	SIMP_TAB_MASK,
	.lock	=	&simp_lock,
};

static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
{
	struct tcf_defact *d = a->priv;

	spin_lock(&d->tcf_lock);
	d->tcf_tm.lastuse = jiffies;
	d->tcf_bstats.bytes += skb->len;
	d->tcf_bstats.packets++;

	/* print policy string followed by _ then packet count
	 * Example if this was the 3rd packet and the string was "hello"
	 * then it would look like "hello_3" (without quotes)
	 **/
	printk("simple: %s_%d\n",
	       (char *)d->tcfd_defdata, d->tcf_bstats.packets);
	spin_unlock(&d->tcf_lock);
	return d->tcf_action;
}

static int tcf_simp_release(struct tcf_defact *d, int bind)
{
	int ret = 0;
	if (d) {
		if (bind)
			d->tcf_bindcnt--;
		d->tcf_refcnt--;
		if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
			kfree(d->tcfd_defdata);
			tcf_hash_destroy(&d->common, &simp_hash_info);
			ret = 1;
		}
	}
	return ret;
}

static int alloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
{
	d->tcfd_defdata = kmemdup(defdata, datalen, GFP_KERNEL);
	if (unlikely(!d->tcfd_defdata))
		return -ENOMEM;
	d->tcfd_datalen = datalen;
	return 0;
}

static int realloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
{
	kfree(d->tcfd_defdata);
	return alloc_defdata(d, datalen, defdata);
}

static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
	[TCA_DEF_PARMS]	= { .len = sizeof(struct tc_defact) },
};

static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
			 struct tc_action *a, int ovr, int bind)
{
	struct nlattr *tb[TCA_DEF_MAX + 1];
	struct tc_defact *parm;
	struct tcf_defact *d;
	struct tcf_common *pc;
	void *defdata;
	u32 datalen = 0;
	int ret = 0, err;

	if (nla == NULL)
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_DEF_MAX, nla, NULL);
	if (err < 0)
		return err;

	if (tb[TCA_DEF_PARMS] == NULL)
		return -EINVAL;

	parm = nla_data(tb[TCA_DEF_PARMS]);
	defdata = nla_data(tb[TCA_DEF_DATA]);
	if (defdata == NULL)
		return -EINVAL;

	datalen = nla_len(tb[TCA_DEF_DATA]);
	if (datalen == 0)
		return -EINVAL;

	pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
	if (!pc) {
		pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
				     &simp_idx_gen, &simp_hash_info);
		if (unlikely(!pc))
			return -ENOMEM;

		d = to_defact(pc);
		ret = alloc_defdata(d, datalen, defdata);
		if (ret < 0) {
			kfree(pc);
			return ret;
		}
		ret = ACT_P_CREATED;
	} else {
		d = to_defact(pc);
		if (!ovr) {
			tcf_simp_release(d, bind);
			return -EEXIST;
		}
		realloc_defdata(d, datalen, defdata);
	}

	spin_lock_bh(&d->tcf_lock);
	d->tcf_action = parm->action;
	spin_unlock_bh(&d->tcf_lock);

	if (ret == ACT_P_CREATED)
		tcf_hash_insert(pc, &simp_hash_info);
	return ret;
}

static inline int tcf_simp_cleanup(struct tc_action *a, int bind)
{
	struct tcf_defact *d = a->priv;

	if (d)
		return tcf_simp_release(d, bind);
	return 0;
}

static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
				int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_defact *d = a->priv;
	struct tc_defact opt;
	struct tcf_t t;

	opt.index = d->tcf_index;
	opt.refcnt = d->tcf_refcnt - ref;
	opt.bindcnt = d->tcf_bindcnt - bind;
	opt.action = d->tcf_action;
	NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
	NLA_PUT(skb, TCA_DEF_DATA, d->tcfd_datalen, d->tcfd_defdata);
	t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
	t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
	t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
	NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
	return skb->len;

nla_put_failure:
	nlmsg_trim(skb, b);
	return -1;
}

static struct tc_action_ops act_simp_ops = {
	.kind		=	"simple",
	.hinfo		=	&simp_hash_info,
	.type		=	TCA_ACT_SIMP,
	.capab		=	TCA_CAP_NONE,
	.owner		=	THIS_MODULE,
	.act		=	tcf_simp,
	.dump		=	tcf_simp_dump,
	.cleanup	=	tcf_simp_cleanup,
	.init		=	tcf_simp_init,
	.walk		=	tcf_generic_walker,
};

MODULE_AUTHOR("Jamal Hadi Salim(2005)");
MODULE_DESCRIPTION("Simple example action");
MODULE_LICENSE("GPL");

static int __init simp_init_module(void)
{
	int ret = tcf_register_action(&act_simp_ops);
	if (!ret)
		printk("Simple TC action Loaded\n");
	return ret;
}

static void __exit simp_cleanup_module(void)
{
	tcf_unregister_action(&act_simp_ops);
}

module_init(simp_init_module);
module_exit(simp_cleanup_module);
Commit	Line	Data
db753079 JHS	1	/*
	2	* net/sched/simp.c Simple example of an action
	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: Jamal Hadi Salim (2005)
	10	*
	11	*/
	12
cbdbf00a DM	13	#include <linux/module.h>
cbdbf00a DM	14	#include <linux/init.h>
db753079	15	#include <linux/kernel.h>
db753079 JHS	16	#include <linux/skbuff.h>
db753079 JHS	17	#include <linux/rtnetlink.h>
dc5fc579	18	#include <net/netlink.h>
db753079 JHS	19	#include <net/pkt_sched.h>
	20
	21	#define TCA_ACT_SIMP 22
	22
db753079 JHS	23	#include <linux/tc_act/tc_defact.h>
	24	#include <net/tc_act/tc_defact.h>
	25
e9ce1cd3 DM	26	#define SIMP_TAB_MASK 7
	27	static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
	28	static u32 simp_idx_gen;
db753079 JHS	29	static DEFINE_RWLOCK(simp_lock);
db753079 JHS	30
28a7b327	31	static struct tcf_hashinfo simp_hash_info = {
e9ce1cd3 DM	32	.htab = tcf_simp_ht,
	33	.hmask = SIMP_TAB_MASK,
	34	.lock = &simp_lock,
	35	};
db753079	36
f43c5a0d	37	static int tcf_simp(struct sk_buff skb, struct tc_action a, struct tcf_result *res)
db753079	38	{
e9ce1cd3	39	struct tcf_defact *d = a->priv;
db753079	40
e9ce1cd3 DM	41	spin_lock(&d->tcf_lock);
	42	d->tcf_tm.lastuse = jiffies;
	43	d->tcf_bstats.bytes += skb->len;
	44	d->tcf_bstats.packets++;
db753079	45
10297b99 YH	46	/* print policy string followed by _ then packet count
	47	* Example if this was the 3rd packet and the string was "hello"
	48	* then it would look like "hello_3" (without quotes)
db753079	49	**/
e9ce1cd3 DM	50	printk("simple: %s_%d\n",
	51	(char *)d->tcfd_defdata, d->tcf_bstats.packets);
	52	spin_unlock(&d->tcf_lock);
	53	return d->tcf_action;
	54	}
	55
	56	static int tcf_simp_release(struct tcf_defact *d, int bind)
	57	{
	58	int ret = 0;
	59	if (d) {
	60	if (bind)
	61	d->tcf_bindcnt--;
	62	d->tcf_refcnt--;
	63	if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
	64	kfree(d->tcfd_defdata);
	65	tcf_hash_destroy(&d->common, &simp_hash_info);
	66	ret = 1;
	67	}
	68	}
	69	return ret;
	70	}
	71
	72	static int alloc_defdata(struct tcf_defact d, u32 datalen, void defdata)
	73	{
c7b1b249	74	d->tcfd_defdata = kmemdup(defdata, datalen, GFP_KERNEL);
e9ce1cd3 DM	75	if (unlikely(!d->tcfd_defdata))
	76	return -ENOMEM;
	77	d->tcfd_datalen = datalen;
e9ce1cd3 DM	78	return 0;
	79	}
	80
	81	static int realloc_defdata(struct tcf_defact d, u32 datalen, void defdata)
	82	{
	83	kfree(d->tcfd_defdata);
	84	return alloc_defdata(d, datalen, defdata);
	85	}
	86
53b2bf3f PM	87	static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
	88	[TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
	89	};
	90
7ba699c6	91	static int tcf_simp_init(struct nlattr nla, struct nlattr est,
e9ce1cd3 DM	92	struct tc_action *a, int ovr, int bind)
e9ce1cd3 DM	93	{
7ba699c6	94	struct nlattr *tb[TCA_DEF_MAX + 1];
e9ce1cd3 DM	95	struct tc_defact *parm;
	96	struct tcf_defact *d;
	97	struct tcf_common *pc;
	98	void *defdata;
	99	u32 datalen = 0;
cee63723	100	int ret = 0, err;
e9ce1cd3	101
cee63723	102	if (nla == NULL)
e9ce1cd3 DM	103	return -EINVAL;
e9ce1cd3 DM	104
cee63723 PM	105	err = nla_parse_nested(tb, TCA_DEF_MAX, nla, NULL);
	106	if (err < 0)
	107	return err;
	108
53b2bf3f	109	if (tb[TCA_DEF_PARMS] == NULL)
e9ce1cd3 DM	110	return -EINVAL;
e9ce1cd3 DM	111
7ba699c6 PM	112	parm = nla_data(tb[TCA_DEF_PARMS]);
7ba699c6 PM	113	defdata = nla_data(tb[TCA_DEF_DATA]);
e9ce1cd3 DM	114	if (defdata == NULL)
	115	return -EINVAL;
	116
7ba699c6	117	datalen = nla_len(tb[TCA_DEF_DATA]);
f5ba2d32	118	if (datalen == 0)
e9ce1cd3 DM	119	return -EINVAL;
	120
	121	pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
	122	if (!pc) {
	123	pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
	124	&simp_idx_gen, &simp_hash_info);
	125	if (unlikely(!pc))
	126	return -ENOMEM;
	127
	128	d = to_defact(pc);
	129	ret = alloc_defdata(d, datalen, defdata);
	130	if (ret < 0) {
	131	kfree(pc);
	132	return ret;
	133	}
	134	ret = ACT_P_CREATED;
	135	} else {
	136	d = to_defact(pc);
	137	if (!ovr) {
	138	tcf_simp_release(d, bind);
	139	return -EEXIST;
	140	}
	141	realloc_defdata(d, datalen, defdata);
	142	}
	143
	144	spin_lock_bh(&d->tcf_lock);
	145	d->tcf_action = parm->action;
	146	spin_unlock_bh(&d->tcf_lock);
	147
	148	if (ret == ACT_P_CREATED)
	149	tcf_hash_insert(pc, &simp_hash_info);
	150	return ret;
	151	}
	152
	153	static inline int tcf_simp_cleanup(struct tc_action *a, int bind)
	154	{
	155	struct tcf_defact *d = a->priv;
	156
	157	if (d)
	158	return tcf_simp_release(d, bind);
	159	return 0;
	160	}
	161
	162	static inline int tcf_simp_dump(struct sk_buff skb, struct tc_action a,
	163	int bind, int ref)
	164	{
27a884dc	165	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3 DM	166	struct tcf_defact *d = a->priv;
	167	struct tc_defact opt;
	168	struct tcf_t t;
	169
	170	opt.index = d->tcf_index;
	171	opt.refcnt = d->tcf_refcnt - ref;
	172	opt.bindcnt = d->tcf_bindcnt - bind;
	173	opt.action = d->tcf_action;
7ba699c6 PM	174	NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
7ba699c6 PM	175	NLA_PUT(skb, TCA_DEF_DATA, d->tcfd_datalen, d->tcfd_defdata);
e9ce1cd3 DM	176	t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
	177	t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
	178	t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
7ba699c6	179	NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
e9ce1cd3 DM	180	return skb->len;
e9ce1cd3 DM	181
7ba699c6	182	nla_put_failure:
dc5fc579	183	nlmsg_trim(skb, b);
e9ce1cd3	184	return -1;
db753079 JHS	185	}
	186
	187	static struct tc_action_ops act_simp_ops = {
e9ce1cd3 DM	188	.kind = "simple",
	189	.hinfo = &simp_hash_info,
	190	.type = TCA_ACT_SIMP,
	191	.capab = TCA_CAP_NONE,
	192	.owner = THIS_MODULE,
	193	.act = tcf_simp,
	194	.dump = tcf_simp_dump,
	195	.cleanup = tcf_simp_cleanup,
	196	.init = tcf_simp_init,
	197	.walk = tcf_generic_walker,
db753079 JHS	198	};
	199
	200	MODULE_AUTHOR("Jamal Hadi Salim(2005)");
	201	MODULE_DESCRIPTION("Simple example action");
	202	MODULE_LICENSE("GPL");
	203
	204	static int __init simp_init_module(void)
	205	{
	206	int ret = tcf_register_action(&act_simp_ops);
	207	if (!ret)
	208	printk("Simple TC action Loaded\n");
	209	return ret;
	210	}
	211
	212	static void __exit simp_cleanup_module(void)
	213	{
	214	tcf_unregister_action(&act_simp_ops);
	215	}
	216
	217	module_init(simp_init_module);
	218	module_exit(simp_cleanup_module);