Release 4.11 net/sched/act_mirred.c

/*
 * net/sched/act_mirred.c       packet mirroring and redirect actions
 *
 *              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 (2002-4)
 *
 * TODO: Add ingress support (and socket redirect support)
 *
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/if_arp.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/tc_act/tc_mirred.h>
#include <net/tc_act/tc_mirred.h>


#define MIRRED_TAB_MASK     7
static LIST_HEAD(mirred_list);
static DEFINE_SPINLOCK(mirred_list_lock);



static bool tcf_mirred_is_act_redirect(int action)
{
	return action == TCA_EGRESS_REDIR || action == TCA_INGRESS_REDIR;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Shmulik Ladkani
18
100.00%
1
100.00%
Total
18
100.00%
1
100.00%



static bool tcf_mirred_act_wants_ingress(int action)
{
	switch (action) {
	case TCA_EGRESS_REDIR:
	case TCA_EGRESS_MIRROR:
		return false;
	case TCA_INGRESS_REDIR:
	case TCA_INGRESS_MIRROR:
		return true;
	default:
		BUG();
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Shmulik Ladkani
33
89.19%
1
50.00%
Willem de Bruijn
4
10.81%
1
50.00%
Total
37
100.00%
2
100.00%



static void tcf_mirred_release(struct tc_action *a, int bind)
{
	struct tcf_mirred *m = to_mirred(a);
	struct net_device *dev;

	/* We could be called either in a RCU callback or with RTNL lock held. */
	spin_lock_bh(&mirred_list_lock);
	list_del(&m->tcfm_list);
	dev = rcu_dereference_protected(m->tcfm_dev, 1);
	if (dev)
		dev_put(dev);
	spin_unlock_bh(&mirred_list_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
37
52.86%
4
57.14%
Jamal Hadi Salim
15
21.43%
1
14.29%
Stephen Hemminger
11
15.71%
1
14.29%
Eric Dumazet
7
10.00%
1
14.29%
Total
70
100.00%
7
100.00%


static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
	[TCA_MIRRED_PARMS]	= { .len = sizeof(struct tc_mirred) },
};


static unsigned int mirred_net_id;

static struct tc_action_ops act_mirred_ops;



static int tcf_mirred_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, mirred_net_id);
	struct nlattr *tb[TCA_MIRRED_MAX + 1];
	bool mac_header_xmit = false;
	struct tc_mirred *parm;
	struct tcf_mirred *m;
	struct net_device *dev;
	bool exists = false;
	int ret;

	if (nla == NULL)
		return -EINVAL;
	ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy);
	if (ret < 0)
		return ret;
	if (tb[TCA_MIRRED_PARMS] == NULL)
		return -EINVAL;
	parm = nla_data(tb[TCA_MIRRED_PARMS]);

	exists = tcf_hash_check(tn, parm->index, a, bind);
	if (exists && bind)
		return 0;

	switch (parm->eaction) {
	case TCA_EGRESS_MIRROR:
	case TCA_EGRESS_REDIR:
	case TCA_INGRESS_REDIR:
	case TCA_INGRESS_MIRROR:
		break;
	default:
		if (exists)
			tcf_hash_release(*a, bind);
		return -EINVAL;
	}
	if (parm->ifindex) {
		dev = __dev_get_by_index(net, parm->ifindex);
		if (dev == NULL) {
			if (exists)
				tcf_hash_release(*a, bind);
			return -ENODEV;
		}
		mac_header_xmit = dev_is_mac_header_xmit(dev);
	} else {
		dev = NULL;
	}

	if (!exists) {
		if (dev == NULL)
			return -EINVAL;
		ret = tcf_hash_create(tn, parm->index, est, a,
				      &act_mirred_ops, bind, true);
		if (ret)
			return ret;
		ret = ACT_P_CREATED;
	} else {
		tcf_hash_release(*a, bind);
		if (!ovr)
			return -EEXIST;
	}
	m = to_mirred(*a);

	ASSERT_RTNL();
	m->tcf_action = parm->action;
	m->tcfm_eaction = parm->eaction;
	if (dev != NULL) {
		m->tcfm_ifindex = parm->ifindex;
		if (ret != ACT_P_CREATED)
			dev_put(rcu_dereference_protected(m->tcfm_dev, 1));
		dev_hold(dev);
		rcu_assign_pointer(m->tcfm_dev, dev);
		m->tcfm_mac_header_xmit = mac_header_xmit;
	}

	if (ret == ACT_P_CREATED) {
		spin_lock_bh(&mirred_list_lock);
		list_add(&m->tcfm_list, &mirred_list);
		spin_unlock_bh(&mirred_list_lock);
		tcf_hash_insert(tn, *a);
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jamal Hadi Salim
180
40.00%
2
7.41%
Patrick McHardy
102
22.67%
7
25.93%
Américo Wang
53
11.78%
8
29.63%
Changli Gao
41
9.11%
1
3.70%
Shmulik Ladkani
21
4.67%
3
11.11%
David S. Miller
20
4.44%
1
3.70%
Stephen Hemminger
13
2.89%
1
3.70%
Eric Dumazet
13
2.89%
2
7.41%
Benjamin LaHaise
6
1.33%
1
3.70%
Eric W. Biedermann
1
0.22%
1
3.70%
Total
450
100.00%
27
100.00%



static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
		      struct tcf_result *res)
{
	struct tcf_mirred *m = to_mirred(a);
	bool m_mac_header_xmit;
	struct net_device *dev;
	struct sk_buff *skb2;
	int retval, err = 0;
	int m_eaction;
	int mac_len;

	tcf_lastuse_update(&m->tcf_tm);
	bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb);

	rcu_read_lock();
	m_mac_header_xmit = READ_ONCE(m->tcfm_mac_header_xmit);
	m_eaction = READ_ONCE(m->tcfm_eaction);
	retval = READ_ONCE(m->tcf_action);
	dev = rcu_dereference(m->tcfm_dev);
	if (unlikely(!dev)) {
		pr_notice_once("tc mirred: target device is gone\n");
		goto out;
	}

	if (unlikely(!(dev->flags & IFF_UP))) {
		net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
				       dev->name);
		goto out;
	}

	skb2 = skb_clone(skb, GFP_ATOMIC);
	if (!skb2)
		goto out;

	/* If action's target direction differs than filter's direction,
         * and devices expect a mac header on xmit, then mac push/pull is
         * needed.
         */
	if (skb_at_tc_ingress(skb) != tcf_mirred_act_wants_ingress(m_eaction) &&
	    m_mac_header_xmit) {
		if (!skb_at_tc_ingress(skb)) {
			/* caught at egress, act ingress: pull mac */
			mac_len = skb_network_header(skb) - skb_mac_header(skb);
			skb_pull_rcsum(skb2, mac_len);
		} else {
			/* caught at ingress, act egress: push mac */
			skb_push_rcsum(skb2, skb->mac_len);
		}
	}

	/* mirror is always swallowed */
	if (tcf_mirred_is_act_redirect(m_eaction)) {
		skb2->tc_redirected = 1;
		skb2->tc_from_ingress = skb2->tc_at_ingress;
	}

	skb2->skb_iif = skb->dev->ifindex;
	skb2->dev = dev;
	if (!tcf_mirred_act_wants_ingress(m_eaction))
		err = dev_queue_xmit(skb2);
	else
		err = netif_receive_skb(skb2);

	if (err) {
out:
		qstats_overlimit_inc(this_cpu_ptr(m->common.cpu_qstats));
		if (tcf_mirred_is_act_redirect(m_eaction))
			retval = TC_ACT_SHOT;
	}
	rcu_read_unlock();

	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jamal Hadi Salim
106
30.99%
2
7.69%
Shmulik Ladkani
84
24.56%
1
3.85%
Eric Dumazet
45
13.16%
4
15.38%
Changli Gao
43
12.57%
3
11.54%
Willem de Bruijn
24
7.02%
3
11.54%
Stephen Hemminger
15
4.39%
1
3.85%
Patrick McHardy
11
3.22%
5
19.23%
Américo Wang
4
1.17%
2
7.69%
Jason (Hui) Wang
3
0.88%
1
3.85%
David S. Miller
3
0.88%
1
3.85%
Herbert Xu
2
0.58%
1
3.85%
Joe Perches
1
0.29%
1
3.85%
Florian Westphal
1
0.29%
1
3.85%
Total
342
100.00%
26
100.00%



static void tcf_stats_update(struct tc_action *a, u64 bytes, u32 packets,
			     u64 lastuse)
{
	struct tcf_mirred *m = to_mirred(a);
	struct tcf_t *tm = &m->tcf_tm;

	_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
	tm->lastuse = lastuse;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jakub Kiciński
37
61.67%
1
50.00%
Paul Blakey
23
38.33%
1
50.00%
Total
60
100.00%
2
100.00%



static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind,
			   int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_mirred *m = to_mirred(a);
	struct tc_mirred opt = {
		.index   = m->tcf_index,
		.action  = m->tcf_action,
		.refcnt  = m->tcf_refcnt - ref,
		.bindcnt = m->tcf_bindcnt - bind,
		.eaction = m->tcfm_eaction,
		.ifindex = m->tcfm_ifindex,
        };
	struct tcf_t t;

	if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;

	tcf_tm_dump(&t, &m->tcf_tm);
	if (nla_put_64bit(skb, TCA_MIRRED_TM, sizeof(t), &t, TCA_MIRRED_PAD))
		goto nla_put_failure;
	return skb->len;

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jamal Hadi Salim
109
64.50%
3
21.43%
David S. Miller
32
18.93%
2
14.29%
Eric Dumazet
13
7.69%
1
7.14%
Patrick McHardy
5
2.96%
4
28.57%
Arnaldo Carvalho de Melo
4
2.37%
2
14.29%
Nicolas Dichtel
3
1.78%
1
7.14%
Américo Wang
3
1.78%
1
7.14%
Total
169
100.00%
14
100.00%



static int tcf_mirred_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, mirred_net_id);

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
56
100.00%
2
100.00%
Total
56
100.00%
2
100.00%



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

	return tcf_hash_search(tn, a, index);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
42
100.00%
2
100.00%
Total
42
100.00%
2
100.00%



static int mirred_device_event(struct notifier_block *unused,
			       unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct tcf_mirred *m;

	ASSERT_RTNL();
	if (event == NETDEV_UNREGISTER) {
		spin_lock_bh(&mirred_list_lock);
		list_for_each_entry(m, &mirred_list, tcfm_list) {
			if (rcu_access_pointer(m->tcfm_dev) == dev) {
				dev_put(dev);
				/* Note : no rcu grace period necessary, as
                                 * net_device are already rcu protected.
                                 */
				RCU_INIT_POINTER(m->tcfm_dev, NULL);
			}
		}
		spin_unlock_bh(&mirred_list_lock);
	}

	return NOTIFY_DONE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
68
69.39%
1
20.00%
Américo Wang
14
14.29%
1
20.00%
Eric Dumazet
11
11.22%
1
20.00%
Jiri Pirko
3
3.06%
1
20.00%
Cong Wang
2
2.04%
1
20.00%
Total
98
100.00%
5
100.00%


static struct notifier_block mirred_device_notifier = {
	.notifier_call = mirred_device_event,
};



static int tcf_mirred_device(const struct tc_action *a, struct net *net,
			     struct net_device **mirred_dev)
{
	int ifindex = tcf_mirred_ifindex(a);

	*mirred_dev = __dev_get_by_index(net, ifindex);
	if (!*mirred_dev)
		return -EINVAL;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hadar Hen Zion
53
98.15%
1
50.00%
Américo Wang
1
1.85%
1
50.00%
Total
54
100.00%
2
100.00%


static struct tc_action_ops act_mirred_ops = {
	.kind		=	"mirred",
	.type		=	TCA_ACT_MIRRED,
	.owner		=	THIS_MODULE,
	.act		=	tcf_mirred,
	.stats_update	=	tcf_stats_update,
	.dump		=	tcf_mirred_dump,
	.cleanup	=	tcf_mirred_release,
	.init		=	tcf_mirred_init,
	.walk		=	tcf_mirred_walker,
	.lookup		=	tcf_mirred_search,
	.size		=	sizeof(struct tcf_mirred),
	.get_dev	=	tcf_mirred_device,
};



static __net_init int mirred_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, mirred_net_id);

	return tc_action_net_init(tn, &act_mirred_ops, MIRRED_TAB_MASK);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
35
100.00%
1
100.00%
Total
35
100.00%
1
100.00%



static void __net_exit mirred_exit_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, mirred_net_id);

	tc_action_net_exit(tn);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%


static struct pernet_operations mirred_net_ops = {
	.init = mirred_init_net,
	.exit = mirred_exit_net,
	.id   = &mirred_net_id,
	.size = sizeof(struct tc_action_net),
};

MODULE_AUTHOR("Jamal Hadi Salim(2002)");
MODULE_DESCRIPTION("Device Mirror/redirect actions");
MODULE_LICENSE("GPL");



static int __init mirred_init_module(void)
{
	int err = register_netdevice_notifier(&mirred_device_notifier);
	if (err)
		return err;

	pr_info("Mirror/redirect action on\n");
	return tcf_register_action(&act_mirred_ops, &mirred_net_ops);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jamal Hadi Salim
20
50.00%
1
20.00%
Stephen Hemminger
17
42.50%
2
40.00%
Américo Wang
3
7.50%
2
40.00%
Total
40
100.00%
5
100.00%



static void __exit mirred_cleanup_module(void)
{
	tcf_unregister_action(&act_mirred_ops, &mirred_net_ops);
	unregister_netdevice_notifier(&mirred_device_notifier);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jamal Hadi Salim
13
54.17%
1
25.00%
Américo Wang
7
29.17%
2
50.00%
Stephen Hemminger
4
16.67%
1
25.00%
Total
24
100.00%
4
100.00%


module_init(mirred_init_module);

module_exit(mirred_cleanup_module);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Jamal Hadi Salim
545
30.90%
6
8.82%
Américo Wang
351
19.90%
13
19.12%
Shmulik Ladkani
156
8.84%
3
4.41%
Patrick McHardy
146
8.28%
11
16.18%
Stephen Hemminger
145
8.22%
2
2.94%
Eric Dumazet
89
5.05%
6
8.82%
Changli Gao
84
4.76%
4
5.88%
Hadar Hen Zion
58
3.29%
1
1.47%
David S. Miller
57
3.23%
2
2.94%
Jakub Kiciński
42
2.38%
1
1.47%
Willem de Bruijn
28
1.59%
3
4.41%
Paul Blakey
23
1.30%
1
1.47%
Arnaldo Carvalho de Melo
7
0.40%
2
2.94%
Benjamin LaHaise
6
0.34%
1
1.47%
Jiri Pirko
4
0.23%
2
2.94%
Eric W. Biedermann
4
0.23%
1
1.47%
Nicolas Dichtel
3
0.17%
1
1.47%
Jason (Hui) Wang
3
0.17%
1
1.47%
Tejun Heo
3
0.17%
1
1.47%
Daniel Borkmann
3
0.17%
1
1.47%
Herbert Xu
2
0.11%
1
1.47%
Cong Wang
2
0.11%
1
1.47%
Joe Perches
1
0.06%
1
1.47%
Alexey Dobriyan
1
0.06%
1
1.47%
Florian Westphal
1
0.06%
1
1.47%
Total
1764
100.00%
68
100.00%
Directory: net/sched

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.