Release 4.11 net/sched/cls_fw.c

/*
 * net/sched/cls_fw.c   Classifier mapping ipchains' fwmark to traffic class.
 *
 *              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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * Changes:
 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
 * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
 *
 * JHS: We should remove the CONFIG_NET_CLS_IND from here
 * eventually when the meta match extension is made available
 *
 */

#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/skbuff.h>
#include <net/netlink.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>


#define HTSIZE 256


struct fw_head {
	
u32			mask;
	
struct fw_filter __rcu	*ht[HTSIZE];
	
struct rcu_head		rcu;
};


struct fw_filter {
	
struct fw_filter __rcu	*next;
	
u32			id;
	
struct tcf_result	res;
#ifdef CONFIG_NET_CLS_IND
	
int			ifindex;
#endif /* CONFIG_NET_CLS_IND */
	
struct tcf_exts		exts;
	
struct tcf_proto	*tp;
	
struct rcu_head		rcu;
};



static u32 fw_hash(u32 handle)
{
	handle ^= (handle >> 16);
	handle ^= (handle >> 8);
	return handle % HTSIZE;
}

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36.67%
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33.33%
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11
36.67%
1
33.33%
Eric Dumazet
8
26.67%
1
33.33%
Total
30
100.00%
3
100.00%



static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
		       struct tcf_result *res)
{
	struct fw_head *head = rcu_dereference_bh(tp->root);
	struct fw_filter *f;
	int r;
	u32 id = skb->mark;

	if (head != NULL) {
		id &= head->mask;

		for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
		     f = rcu_dereference_bh(f->next)) {
			if (f->id == id) {
				*res = f->res;
#ifdef CONFIG_NET_CLS_IND
				if (!tcf_match_indev(skb, f->ifindex))
					continue;
#endif /* CONFIG_NET_CLS_IND */
				r = tcf_exts_exec(skb, &f->exts, res);
				if (r < 0)
					continue;

				return r;
			}
		}
	} else {
		/* Old method: classify the packet using its skb mark. */
		if (id && (TC_H_MAJ(id) == 0 ||
			   !(TC_H_MAJ(id ^ tp->q->handle)))) {
			res->classid = id;
			res->class = 0;
			return 0;
		}
	}

	return -1;
}

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Linus Torvalds (pre-git)
139
67.80%
4
28.57%
Thomas Graf
25
12.20%
3
21.43%
Jamal Hadi Salim
21
10.24%
1
7.14%
John Fastabend
9
4.39%
1
7.14%
Patrick McHardy
6
2.93%
1
7.14%
Américo Wang
2
0.98%
2
14.29%
David S. Miller
2
0.98%
1
7.14%
Eric Dumazet
1
0.49%
1
7.14%
Total
205
100.00%
14
100.00%



static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f;

	if (head == NULL)
		return 0;

	f = rtnl_dereference(head->ht[fw_hash(handle)]);
	for (; f; f = rtnl_dereference(f->next)) {
		if (f->id == handle)
			return (unsigned long)f;
	}
	return 0;
}

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Linus Torvalds (pre-git)
78
86.67%
2
66.67%
John Fastabend
12
13.33%
1
33.33%
Total
90
100.00%
3
100.00%



static int fw_init(struct tcf_proto *tp)
{
	/* We don't allocate fw_head here, because in the old method
         * we don't need it at all.
         */
	return 0;
}

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Linus Torvalds (pre-git)
14
93.33%
1
50.00%
Américo Wang
1
6.67%
1
50.00%
Total
15
100.00%
2
100.00%



static void fw_delete_filter(struct rcu_head *head)
{
	struct fw_filter *f = container_of(head, struct fw_filter, rcu);

	tcf_exts_destroy(&f->exts);
	kfree(f);
}

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Thomas Graf
24
61.54%
1
50.00%
John Fastabend
15
38.46%
1
50.00%
Total
39
100.00%
2
100.00%



static bool fw_destroy(struct tcf_proto *tp, bool force)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f;
	int h;

	if (head == NULL)
		return true;

	if (!force) {
		for (h = 0; h < HTSIZE; h++)
			if (rcu_access_pointer(head->ht[h]))
				return false;
	}

	for (h = 0; h < HTSIZE; h++) {
		while ((f = rtnl_dereference(head->ht[h])) != NULL) {
			RCU_INIT_POINTER(head->ht[h],
					 rtnl_dereference(f->next));
			tcf_unbind_filter(tp, &f->res);
			call_rcu(&f->rcu, fw_delete_filter);
		}
	}
	RCU_INIT_POINTER(tp->root, NULL);
	kfree_rcu(head, rcu);
	return true;
}

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Linus Torvalds (pre-git)
82
48.52%
2
33.33%
Cong Wang
45
26.63%
1
16.67%
John Fastabend
41
24.26%
2
33.33%
Thomas Graf
1
0.59%
1
16.67%
Total
169
100.00%
6
100.00%



static int fw_delete(struct tcf_proto *tp, unsigned long arg)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f = (struct fw_filter *)arg;
	struct fw_filter __rcu **fp;
	struct fw_filter *pfp;

	if (head == NULL || f == NULL)
		goto out;

	fp = &head->ht[fw_hash(f->id)];

	for (pfp = rtnl_dereference(*fp); pfp;
	     fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
		if (pfp == f) {
			RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
			tcf_unbind_filter(tp, &f->res);
			call_rcu(&f->rcu, fw_delete_filter);
			return 0;
		}
	}
out:
	return -EINVAL;
}

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Linus Torvalds (pre-git)
103
65.19%
3
50.00%
John Fastabend
50
31.65%
2
33.33%
Arnaldo Carvalho de Melo
5
3.16%
1
16.67%
Total
158
100.00%
6
100.00%


static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
	[TCA_FW_CLASSID]	= { .type = NLA_U32 },
	[TCA_FW_INDEV]		= { .type = NLA_STRING, .len = IFNAMSIZ },
	[TCA_FW_MASK]		= { .type = NLA_U32 },
};


static int

fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
		struct nlattr **tb, struct nlattr **tca, unsigned long base,
		bool ovr)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct tcf_exts e;
	u32 mask;
	int err;

	err = tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE);
	if (err < 0)
		return err;
	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
	if (err < 0)
		goto errout;

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

#ifdef CONFIG_NET_CLS_IND
	if (tb[TCA_FW_INDEV]) {
		int ret;
		ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
		if (ret < 0) {
			err = ret;
			goto errout;
		}
		f->ifindex = ret;
	}
#endif /* CONFIG_NET_CLS_IND */

	err = -EINVAL;
	if (tb[TCA_FW_MASK]) {
		mask = nla_get_u32(tb[TCA_FW_MASK]);
		if (mask != head->mask)
			goto errout;
	} else if (head->mask != 0xFFFFFFFF)
		goto errout;

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

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

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Thomas Graf
74
27.11%
3
16.67%
Linus Torvalds (pre-git)
66
24.18%
3
16.67%
Patrick McHardy
57
20.88%
3
16.67%
Américo Wang
36
13.19%
3
16.67%
Jamal Hadi Salim
14
5.13%
1
5.56%
Wei Yongjun
11
4.03%
2
11.11%
Benjamin LaHaise
7
2.56%
1
5.56%
Cong Wang
5
1.83%
1
5.56%
John Fastabend
3
1.10%
1
5.56%
Total
273
100.00%
18
100.00%



static int fw_change(struct net *net, struct sk_buff *in_skb,
		     struct tcf_proto *tp, unsigned long base,
		     u32 handle, struct nlattr **tca, unsigned long *arg,
		     bool ovr)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f = (struct fw_filter *) *arg;
	struct nlattr *opt = tca[TCA_OPTIONS];
	struct nlattr *tb[TCA_FW_MAX + 1];
	int err;

	if (!opt)
		return handle ? -EINVAL : 0; /* Succeed if it is old method. */

	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
	if (err < 0)
		return err;

	if (f) {
		struct fw_filter *pfp, *fnew;
		struct fw_filter __rcu **fp;

		if (f->id != handle && handle)
			return -EINVAL;

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

		fnew->id = f->id;
		fnew->res = f->res;
#ifdef CONFIG_NET_CLS_IND
		fnew->ifindex = f->ifindex;
#endif /* CONFIG_NET_CLS_IND */
		fnew->tp = f->tp;

		err = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
		if (err < 0) {
			kfree(fnew);
			return err;
		}

		err = fw_change_attrs(net, tp, fnew, tb, tca, base, ovr);
		if (err < 0) {
			tcf_exts_destroy(&fnew->exts);
			kfree(fnew);
			return err;
		}

		fp = &head->ht[fw_hash(fnew->id)];
		for (pfp = rtnl_dereference(*fp); pfp;
		     fp = &pfp->next, pfp = rtnl_dereference(*fp))
			if (pfp == f)
				break;

		RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
		rcu_assign_pointer(*fp, fnew);
		tcf_unbind_filter(tp, &f->res);
		call_rcu(&f->rcu, fw_delete_filter);

		*arg = (unsigned long)fnew;
		return err;
	}

	if (!handle)
		return -EINVAL;

	if (!head) {
		u32 mask = 0xFFFFFFFF;
		if (tb[TCA_FW_MASK])
			mask = nla_get_u32(tb[TCA_FW_MASK]);

		head = kzalloc(sizeof(*head), GFP_KERNEL);
		if (!head)
			return -ENOBUFS;
		head->mask = mask;

		rcu_assign_pointer(tp->root, head);
	}

	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	if (f == NULL)
		return -ENOBUFS;

	err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
	if (err < 0)
		goto errout;
	f->id = handle;
	f->tp = tp;

	err = fw_change_attrs(net, tp, f, tb, tca, base, ovr);
	if (err < 0)
		goto errout;

	RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
	rcu_assign_pointer(head->ht[fw_hash(handle)], f);

	*arg = (unsigned long)f;
	return 0;

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

Contributors
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John Fastabend
223
35.97%
3
14.29%
Thomas Graf
126
20.32%
1
4.76%
Américo Wang
95
15.32%
5
23.81%
Linus Torvalds (pre-git)
80
12.90%
2
9.52%
Jamal Hadi Salim
38
6.13%
1
4.76%
Patrick McHardy
36
5.81%
5
23.81%
Benjamin LaHaise
9
1.45%
1
4.76%
Cong Wang
7
1.13%
1
4.76%
Eric W. Biedermann
5
0.81%
1
4.76%
Panagiotis Issaris
1
0.16%
1
4.76%
Total
620
100.00%
21
100.00%



static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	int h;

	if (head == NULL)
		arg->stop = 1;

	if (arg->stop)
		return;

	for (h = 0; h < HTSIZE; h++) {
		struct fw_filter *f;

		for (f = rtnl_dereference(head->ht[h]); f;
		     f = rtnl_dereference(f->next)) {
			if (arg->count < arg->skip) {
				arg->count++;
				continue;
			}
			if (arg->fn(tp, (unsigned long)f, arg) < 0) {
				arg->stop = 1;
				return;
			}
			arg->count++;
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
137
92.57%
3
50.00%
John Fastabend
9
6.08%
1
16.67%
Thomas Graf
2
1.35%
2
33.33%
Total
148
100.00%
6
100.00%



static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
		   struct sk_buff *skb, struct tcmsg *t)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f = (struct fw_filter *)fh;
	struct nlattr *nest;

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

	t->tcm_handle = f->id;

	if (!f->res.classid && !tcf_exts_is_available(&f->exts))
		return skb->len;

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

	if (f->res.classid &&
	    nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
		goto nla_put_failure;
#ifdef CONFIG_NET_CLS_IND
	if (f->ifindex) {
		struct net_device *dev;
		dev = __dev_get_by_index(net, f->ifindex);
		if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
			goto nla_put_failure;
	}
#endif /* CONFIG_NET_CLS_IND */
	if (head->mask != 0xFFFFFFFF &&
	    nla_put_u32(skb, TCA_FW_MASK, head->mask))
		goto nla_put_failure;

	if (tcf_exts_dump(skb, &f->exts) < 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;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
131
48.16%
3
17.65%
Patrick McHardy
44
16.18%
3
17.65%
Américo Wang
28
10.29%
2
11.76%
Jamal Hadi Salim
23
8.46%
1
5.88%
Thomas Graf
21
7.72%
4
23.53%
David S. Miller
18
6.62%
1
5.88%
John Fastabend
3
1.10%
1
5.88%
Arnaldo Carvalho de Melo
2
0.74%
1
5.88%
Jiri Pirko
2
0.74%
1
5.88%
Total
272
100.00%
17
100.00%


static struct tcf_proto_ops cls_fw_ops __read_mostly = {
	.kind		=	"fw",
	.classify	=	fw_classify,
	.init		=	fw_init,
	.destroy	=	fw_destroy,
	.get		=	fw_get,
	.change		=	fw_change,
	.delete		=	fw_delete,
	.walk		=	fw_walk,
	.dump		=	fw_dump,
	.owner		=	THIS_MODULE,
};



static int __init init_fw(void)
{
	return register_tcf_proto_ops(&cls_fw_ops);
}

Contributors
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Linus Torvalds (pre-git)
13
81.25%
1
50.00%
Al Viro
3
18.75%
1
50.00%
Total
16
100.00%
2
100.00%



static void __exit exit_fw(void)
{
	unregister_tcf_proto_ops(&cls_fw_ops);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
12
80.00%
1
50.00%
Al Viro
3
20.00%
1
50.00%
Total
15
100.00%
2
100.00%

module_init(init_fw)
module_exit(exit_fw)
MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
942
41.53%
6
10.91%
John Fastabend
380
16.75%
3
5.45%
Thomas Graf
297
13.10%
11
20.00%
Patrick McHardy
196
8.64%
9
16.36%
Américo Wang
164
7.23%
7
12.73%
Jamal Hadi Salim
101
4.45%
1
1.82%
Cong Wang
57
2.51%
2
3.64%
David S. Miller
53
2.34%
3
5.45%
Benjamin LaHaise
16
0.71%
1
1.82%
Al Viro
15
0.66%
1
1.82%
Eric Dumazet
13
0.57%
2
3.64%
Wei Yongjun
11
0.49%
2
3.64%
Arnaldo Carvalho de Melo
7
0.31%
2
3.64%
Eric W. Biedermann
5
0.22%
1
1.82%
Linus Torvalds
5
0.22%
1
1.82%
Tejun Heo
3
0.13%
1
1.82%
Jiri Pirko
2
0.09%
1
1.82%
Panagiotis Issaris
1
0.04%
1
1.82%
Total
2268
100.00%
55
100.00%
Directory: net/sched

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