Release 4.14 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 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;
	union {
		
struct work_struct	work;
		
struct rcu_head		rcu;
	};
};



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;
}

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David S. Miller
98
95.15%
1
33.33%
John Fastabend
4
3.88%
1
33.33%
Eric Dumazet
1
0.97%
1
33.33%
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103
100.00%
3
100.00%



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;
}

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David S. Miller
46
79.31%
1
25.00%
Américo Wang
5
8.62%
1
25.00%
Daniel Borkmann
4
6.90%
1
25.00%
John Fastabend
3
5.17%
1
25.00%
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58
100.00%
4
100.00%



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

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Patrick McHardy
41
69.49%
1
33.33%
David S. Miller
14
23.73%
1
33.33%
John Fastabend
4
6.78%
1
33.33%
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59
100.00%
3
100.00%



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);
}

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40
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static void basic_delete_filter_work(struct work_struct *work)
{
	struct basic_filter *f = container_of(work, struct basic_filter, work);

	rtnl_lock();
	__basic_delete_filter(f);
	rtnl_unlock();
}

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David S. Miller
14
37.84%
1
25.00%
Américo Wang
12
32.43%
2
50.00%
John Fastabend
11
29.73%
1
25.00%
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37
100.00%
4
100.00%



static void basic_delete_filter(struct rcu_head *head)
{
	struct basic_filter *f = container_of(head, struct basic_filter, rcu);

	INIT_WORK(&f->work, basic_delete_filter_work);
	tcf_queue_work(&f->work);
}

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44
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44
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1
100.00%



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);
		if (tcf_exts_get_net(&f->exts))
			call_rcu(&f->rcu, basic_delete_filter);
		else
			__basic_delete_filter(f);
	}
	kfree_rcu(head, rcu);
}

Contributors
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David S. Miller
46
48.94%
1
16.67%
John Fastabend
27
28.72%
2
33.33%
Américo Wang
17
18.09%
2
33.33%
Patrick McHardy
4
4.26%
1
16.67%
Total
94
100.00%
6
100.00%



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);
	tcf_exts_get_net(&f->exts);
	call_rcu(&f->rcu, basic_delete_filter);
	*last = list_empty(&head->flist);
	return 0;
}

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Américo Wang
37
42.05%
3
42.86%
David S. Miller
32
36.36%
1
14.29%
John Fastabend
16
18.18%
2
28.57%
Jiri Pirko
3
3.41%
1
14.29%
Total
88
100.00%
7
100.00%


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;
}

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David S. Miller
108
76.60%
1
12.50%
Jiri Pirko
12
8.51%
2
25.00%
Benjamin LaHaise
7
4.96%
1
12.50%
John Fastabend
6
4.26%
1
12.50%
Cong Wang
5
3.55%
1
12.50%
Patrick McHardy
3
2.13%
2
25.00%
Total
141
100.00%
8
100.00%



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;

	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, TCA_BASIC_ACT, TCA_BASIC_POLICE);
	if (err < 0)
		goto errout;

	err = -EINVAL;
	if (handle) {
		fnew->handle = handle;
	} else if (fold) {
		fnew->handle = fold->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) {
			pr_err("Insufficient number of handles\n");
			goto errout;
		}

		fnew->handle = head->hgenerator;
	}

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

	*arg = fnew;

	if (fold) {
		list_replace_rcu(&fold->link, &fnew->link);
		tcf_unbind_filter(tp, &fold->res);
		tcf_exts_get_net(&fold->exts);
		call_rcu(&fold->rcu, basic_delete_filter);
	} else {
		list_add_rcu(&fnew->link, &head->flist);
	}

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

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David S. Miller
249
60.44%
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5.26%
John Fastabend
82
19.90%
2
10.53%
Américo Wang
40
9.71%
5
26.32%
Patrick McHardy
14
3.40%
3
15.79%
Benjamin LaHaise
7
1.70%
1
5.26%
Cong Wang
5
1.21%
1
5.26%
Eric W. Biedermann
5
1.21%
1
5.26%
Jiri Pirko
5
1.21%
1
5.26%
Johannes Berg
2
0.49%
1
5.26%
Eric Dumazet
1
0.24%
1
5.26%
Kim Nordlund
1
0.24%
1
5.26%
Panagiotis Issaris
1
0.24%
1
5.26%
Total
412
100.00%
19
100.00%



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++;
	}
}

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96.55%
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John Fastabend
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3.45%
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2
100.00%



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;
}

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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;
}

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David S. Miller
112
63.64%
2
22.22%
Patrick McHardy
20
11.36%
2
22.22%
Thomas Graf
18
10.23%
1
11.11%
Stephen Hemminger
17
9.66%
1
11.11%
Américo Wang
7
3.98%
2
22.22%
Arnaldo Carvalho de Melo
2
1.14%
1
11.11%
Total
176
100.00%
9
100.00%


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);
}

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

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module_init(init_basic)
module_exit(exit_basic)
MODULE_LICENSE("GPL");

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David S. Miller
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59.90%
2
5.13%
Américo Wang
259
16.03%
9
23.08%
John Fastabend
169
10.46%
2
5.13%
Patrick McHardy
118
7.30%
8
20.51%
Jiri Pirko
20
1.24%
4
10.26%
Thomas Graf
18
1.11%
1
2.56%
Stephen Hemminger
17
1.05%
1
2.56%
Benjamin LaHaise
14
0.87%
1
2.56%
Cong Wang
10
0.62%
1
2.56%
Eric W. Biedermann
5
0.31%
1
2.56%
Arnaldo Carvalho de Melo
5
0.31%
2
5.13%
Daniel Borkmann
4
0.25%
1
2.56%
Tejun Heo
3
0.19%
1
2.56%
Johannes Berg
2
0.12%
1
2.56%
Eric Dumazet
2
0.12%
2
5.13%
Panagiotis Issaris
1
0.06%
1
2.56%
Kim Nordlund
1
0.06%
1
2.56%
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Directory: net/sched

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