Release 4.11 net/sched/act_simple.c

/*
 * net/sched/act_simple.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 (2005-8)
 *
 */

#include <linux/module.h>
#include <linux/slab.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 unsigned int simp_net_id;

static struct tc_action_ops act_simp_ops;


#define SIMP_MAX_DATA	32


static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
		    struct tcf_result *res)
{
	struct tcf_defact *d = to_defact(a);

	spin_lock(&d->tcf_lock);
	tcf_lastuse_update(&d->tcf_tm);
	bstats_update(&d->tcf_bstats, skb);

	/* 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)
         */
	pr_info("simple: %s_%d\n",
	       (char *)d->tcfd_defdata, d->tcf_bstats.packets);
	spin_unlock(&d->tcf_lock);
	return d->tcf_action;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jamal Hadi Salim
59
64.84%
2
18.18%
David S. Miller
15
16.48%
1
9.09%
Patrick McHardy
6
6.59%
2
18.18%
Eric Dumazet
6
6.59%
3
27.27%
Américo Wang
3
3.30%
1
9.09%
Jussi Kivilinna
1
1.10%
1
9.09%
Stephen Hemminger
1
1.10%
1
9.09%
Total
91
100.00%
11
100.00%



static void tcf_simp_release(struct tc_action *a, int bind)
{
	struct tcf_defact *d = to_defact(a);
	kfree(d->tcfd_defdata);
}

Contributors
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David S. Miller
16
51.61%
1
25.00%
Américo Wang
13
41.94%
2
50.00%
Jamal Hadi Salim
2
6.45%
1
25.00%
Total
31
100.00%
4
100.00%



static int alloc_defdata(struct tcf_defact *d, char *defdata)
{
	d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
	if (unlikely(!d->tcfd_defdata))
		return -ENOMEM;
	strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
	return 0;
}

Contributors
Person
Tokens
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CommitProp
David S. Miller
39
72.22%
1
25.00%
Dan Carpenter
12
22.22%
1
25.00%
Jamal Hadi Salim
3
5.56%
2
50.00%
Total
54
100.00%
4
100.00%



static void reset_policy(struct tcf_defact *d, char *defdata,
			 struct tc_defact *p)
{
	spin_lock_bh(&d->tcf_lock);
	d->tcf_action = p->action;
	memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
	strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
	spin_unlock_bh(&d->tcf_lock);
}

Contributors
Person
Tokens
Prop
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CommitProp
Jamal Hadi Salim
44
66.67%
3
75.00%
David S. Miller
22
33.33%
1
25.00%
Total
66
100.00%
4
100.00%


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



static int tcf_simp_init(struct net *net, struct nlattr *nla,
			 struct nlattr *est, struct tc_action **a,
			 int ovr, int bind)
{
	struct tc_action_net *tn = net_generic(net, simp_net_id);
	struct nlattr *tb[TCA_DEF_MAX + 1];
	struct tc_defact *parm;
	struct tcf_defact *d;
	bool exists = false;
	int ret = 0, err;
	char *defdata;

	if (nla == NULL)
		return -EINVAL;

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

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

	parm = nla_data(tb[TCA_DEF_PARMS]);
	exists = tcf_hash_check(tn, parm->index, a, bind);
	if (exists && bind)
		return 0;

	if (tb[TCA_DEF_DATA] == NULL) {
		if (exists)
			tcf_hash_release(*a, bind);
		return -EINVAL;
	}

	defdata = nla_data(tb[TCA_DEF_DATA]);

	if (!exists) {
		ret = tcf_hash_create(tn, parm->index, est, a,
				      &act_simp_ops, bind, false);
		if (ret)
			return ret;

		d = to_defact(*a);
		ret = alloc_defdata(d, defdata);
		if (ret < 0) {
			tcf_hash_cleanup(*a, est);
			return ret;
		}
		d->tcf_action = parm->action;
		ret = ACT_P_CREATED;
	} else {
		d = to_defact(*a);

		tcf_hash_release(*a, bind);
		if (!ovr)
			return -EEXIST;

		reset_policy(d, defdata, parm);
	}

	if (ret == ACT_P_CREATED)
		tcf_hash_insert(tn, *a);
	return ret;
}

Contributors
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David S. Miller
179
53.43%
1
6.25%
Jamal Hadi Salim
76
22.69%
4
25.00%
Américo Wang
47
14.03%
6
37.50%
Patrick McHardy
24
7.16%
2
12.50%
Benjamin LaHaise
5
1.49%
1
6.25%
Hiroaki SHIMODA
2
0.60%
1
6.25%
Eric Dumazet
2
0.60%
1
6.25%
Total
335
100.00%
16
100.00%



static 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 = to_defact(a);
	struct tc_defact opt = {
		.index   = d->tcf_index,
		.refcnt  = d->tcf_refcnt - ref,
		.bindcnt = d->tcf_bindcnt - bind,
		.action  = d->tcf_action,
        };
	struct tcf_t t;

	if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
	    nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
		goto nla_put_failure;

	tcf_tm_dump(&t, &d->tcf_tm);
	if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
		goto nla_put_failure;
	return skb->len;

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

Contributors
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CommitProp
David S. Miller
139
83.73%
2
20.00%
Eric Dumazet
11
6.63%
1
10.00%
Jamal Hadi Salim
5
3.01%
2
20.00%
Arnaldo Carvalho de Melo
4
2.41%
2
20.00%
Américo Wang
3
1.81%
1
10.00%
Nicolas Dichtel
3
1.81%
1
10.00%
Patrick McHardy
1
0.60%
1
10.00%
Total
166
100.00%
10
100.00%



static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
			   struct netlink_callback *cb, int type,
			   const struct tc_action_ops *ops)
{
	struct tc_action_net *tn = net_generic(net, simp_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops);
}

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56
100.00%
2
100.00%



static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index)
{
	struct tc_action_net *tn = net_generic(net, simp_net_id);

	return tcf_hash_search(tn, a, index);
}

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2
100.00%
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2
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static struct tc_action_ops act_simp_ops = {
	.kind		=	"simple",
	.type		=	TCA_ACT_SIMP,
	.owner		=	THIS_MODULE,
	.act		=	tcf_simp,
	.dump		=	tcf_simp_dump,
	.cleanup	=	tcf_simp_release,
	.init		=	tcf_simp_init,
	.walk		=	tcf_simp_walker,
	.lookup		=	tcf_simp_search,
	.size		=	sizeof(struct tcf_defact),
};



static __net_init int simp_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, simp_net_id);

	return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK);
}

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1
100.00%
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35
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1
100.00%



static void __net_exit simp_exit_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, simp_net_id);

	tc_action_net_exit(tn);
}

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static struct pernet_operations simp_net_ops = {
	.init = simp_init_net,
	.exit = simp_exit_net,
	.id   = &simp_net_id,
	.size = sizeof(struct tc_action_net),
};

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, &simp_net_ops);
	if (!ret)
		pr_info("Simple TC action Loaded\n");
	return ret;
}

Contributors
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Jamal Hadi Salim
28
82.35%
1
25.00%
Américo Wang
5
14.71%
2
50.00%
Stephen Hemminger
1
2.94%
1
25.00%
Total
34
100.00%
4
100.00%



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

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Jamal Hadi Salim
15
83.33%
1
50.00%
Américo Wang
3
16.67%
1
50.00%
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18
100.00%
2
100.00%


module_init(simp_init_module);

module_exit(simp_cleanup_module);
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David S. Miller
455
38.82%
3
7.69%
Jamal Hadi Salim
305
26.02%
8
20.51%
Américo Wang
297
25.34%
7
17.95%
Patrick McHardy
59
5.03%
5
12.82%
Eric Dumazet
19
1.62%
5
12.82%
Dan Carpenter
12
1.02%
1
2.56%
Arnaldo Carvalho de Melo
7
0.60%
2
5.13%
Benjamin LaHaise
5
0.43%
1
2.56%
Tejun Heo
3
0.26%
1
2.56%
Nicolas Dichtel
3
0.26%
1
2.56%
Stephen Hemminger
2
0.17%
1
2.56%
Hiroaki SHIMODA
2
0.17%
1
2.56%
Jussi Kivilinna
1
0.09%
1
2.56%
Jiri Pirko
1
0.09%
1
2.56%
Alexey Dobriyan
1
0.09%
1
2.56%
Total
1172
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39
100.00%
Directory: net/sched

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