Release 4.14 net/bridge/br_ioctl.c

/*
 *      Ioctl handler
 *      Linux ethernet bridge
 *
 *      Authors:
 *      Lennert Buytenhek               <buytenh@gnu.org>
 *
 *      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.
 */

#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/if_bridge.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/times.h>
#include <net/net_namespace.h>
#include <linux/uaccess.h>
#include "br_private.h"



static int get_bridge_ifindices(struct net *net, int *indices, int num)
{
	struct net_device *dev;
	int i = 0;

	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
		if (i >= num)
			break;
		if (dev->priv_flags & IFF_EBRIDGE)
			indices[i++] = dev->ifindex;
	}
	rcu_read_unlock();

	return i;
}

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Stephen Hemminger
46
65.71%
1
16.67%
Pavel Emelyanov
9
12.86%
1
16.67%
Nikolay Aleksandrov
7
10.00%
1
16.67%
Alexey Dobriyan
6
8.57%
1
16.67%
Linus Torvalds (pre-git)
1
1.43%
1
16.67%
Eric W. Biedermann
1
1.43%
1
16.67%
Total
70
100.00%
6
100.00%

/* called with RTNL */


static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
{
	struct net_bridge_port *p;

	list_for_each_entry(p, &br->port_list, list) {
		if (p->port_no < num)
			ifindices[p->port_no] = p->dev->ifindex;
	}
}

Contributors
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Tokens
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CommitProp
Stephen Hemminger
46
85.19%
1
50.00%
Linus Torvalds (pre-git)
8
14.81%
1
50.00%
Total
54
100.00%
2
100.00%

/*
 * Format up to a page worth of forwarding table entries
 * userbuf -- where to copy result
 * maxnum  -- maximum number of entries desired
 *            (limited to a page for sanity)
 * offset  -- number of records to skip
 */


static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
			   unsigned long maxnum, unsigned long offset)
{
	int num;
	void *buf;
	size_t size;

	/* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
	if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
		maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);

	size = maxnum * sizeof(struct __fdb_entry);

	buf = kmalloc(size, GFP_USER);
	if (!buf)
		return -ENOMEM;

	num = br_fdb_fillbuf(br, buf, maxnum, offset);
	if (num > 0) {
		if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
			num = -EFAULT;
	}
	kfree(buf);

	return num;
}

Contributors
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CommitProp
Stephen Hemminger
119
87.50%
1
50.00%
Chris Wright
17
12.50%
1
50.00%
Total
136
100.00%
2
100.00%

/* called with RTNL */


static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
{
	struct net *net = dev_net(br->dev);
	struct net_device *dev;
	int ret;

	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
		return -EPERM;

	dev = __dev_get_by_index(net, ifindex);
	if (dev == NULL)
		return -EINVAL;

	if (isadd)
		ret = br_add_if(br, dev);
	else
		ret = br_del_if(br, dev);

	return ret;
}

Contributors
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CommitProp
Stephen Hemminger
78
79.59%
2
40.00%
Eric W. Biedermann
19
19.39%
2
40.00%
Eric Dumazet
1
1.02%
1
20.00%
Total
98
100.00%
5
100.00%

/*
 * Legacy ioctl's through SIOCDEVPRIVATE
 * This interface is deprecated because it was too difficult to
 * to do the translation for 32/64bit ioctl compatibility.
 */


static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_port *p = NULL;
	unsigned long args[4];
	int ret = -EOPNOTSUPP;

	if (copy_from_user(args, rq->ifr_data, sizeof(args)))
		return -EFAULT;

	switch (args[0]) {
	case BRCTL_ADD_IF:
	case BRCTL_DEL_IF:
		return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);

	case BRCTL_GET_BRIDGE_INFO:
	{
		struct __bridge_info b;

		memset(&b, 0, sizeof(struct __bridge_info));
		rcu_read_lock();
		memcpy(&b.designated_root, &br->designated_root, 8);
		memcpy(&b.bridge_id, &br->bridge_id, 8);
		b.root_path_cost = br->root_path_cost;
		b.max_age = jiffies_to_clock_t(br->max_age);
		b.hello_time = jiffies_to_clock_t(br->hello_time);
		b.forward_delay = br->forward_delay;
		b.bridge_max_age = br->bridge_max_age;
		b.bridge_hello_time = br->bridge_hello_time;
		b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
		b.topology_change = br->topology_change;
		b.topology_change_detected = br->topology_change_detected;
		b.root_port = br->root_port;

		b.stp_enabled = (br->stp_enabled != BR_NO_STP);
		b.ageing_time = jiffies_to_clock_t(br->ageing_time);
		b.hello_timer_value = br_timer_value(&br->hello_timer);
		b.tcn_timer_value = br_timer_value(&br->tcn_timer);
		b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
		b.gc_timer_value = br_timer_value(&br->gc_work.timer);
		rcu_read_unlock();

		if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
			return -EFAULT;

		return 0;
	}

	case BRCTL_GET_PORT_LIST:
	{
		int num, *indices;

		num = args[2];
		if (num < 0)
			return -EINVAL;
		if (num == 0)
			num = 256;
		if (num > BR_MAX_PORTS)
			num = BR_MAX_PORTS;

		indices = kcalloc(num, sizeof(int), GFP_KERNEL);
		if (indices == NULL)
			return -ENOMEM;

		get_port_ifindices(br, indices, num);
		if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
			num =  -EFAULT;
		kfree(indices);
		return num;
	}

	case BRCTL_SET_BRIDGE_FORWARD_DELAY:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		ret = br_set_forward_delay(br, args[1]);
		break;

	case BRCTL_SET_BRIDGE_HELLO_TIME:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		ret = br_set_hello_time(br, args[1]);
		break;

	case BRCTL_SET_BRIDGE_MAX_AGE:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		ret = br_set_max_age(br, args[1]);
		break;

	case BRCTL_SET_AGEING_TIME:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		ret = br_set_ageing_time(br, args[1]);
		break;

	case BRCTL_GET_PORT_INFO:
	{
		struct __port_info p;
		struct net_bridge_port *pt;

		rcu_read_lock();
		if ((pt = br_get_port(br, args[2])) == NULL) {
			rcu_read_unlock();
			return -EINVAL;
		}

		memset(&p, 0, sizeof(struct __port_info));
		memcpy(&p.designated_root, &pt->designated_root, 8);
		memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
		p.port_id = pt->port_id;
		p.designated_port = pt->designated_port;
		p.path_cost = pt->path_cost;
		p.designated_cost = pt->designated_cost;
		p.state = pt->state;
		p.top_change_ack = pt->topology_change_ack;
		p.config_pending = pt->config_pending;
		p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
		p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
		p.hold_timer_value = br_timer_value(&pt->hold_timer);

		rcu_read_unlock();

		if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
			return -EFAULT;

		return 0;
	}

	case BRCTL_SET_BRIDGE_STP_STATE:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		br_stp_set_enabled(br, args[1]);
		ret = 0;
		break;

	case BRCTL_SET_BRIDGE_PRIORITY:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		br_stp_set_bridge_priority(br, args[1]);
		ret = 0;
		break;

	case BRCTL_SET_PORT_PRIORITY:
	{
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		spin_lock_bh(&br->lock);
		if ((p = br_get_port(br, args[1])) == NULL)
			ret = -EINVAL;
		else
			ret = br_stp_set_port_priority(p, args[2]);
		spin_unlock_bh(&br->lock);
		break;
	}

	case BRCTL_SET_PATH_COST:
	{
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		spin_lock_bh(&br->lock);
		if ((p = br_get_port(br, args[1])) == NULL)
			ret = -EINVAL;
		else
			ret = br_stp_set_path_cost(p, args[2]);
		spin_unlock_bh(&br->lock);
		break;
	}

	case BRCTL_GET_FDB_ENTRIES:
		return get_fdb_entries(br, (void __user *)args[1],
				       args[2], args[3]);
	}

	if (!ret) {
		if (p)
			br_ifinfo_notify(RTM_NEWLINK, p);
		else
			netdev_state_change(br->dev);
	}

	return ret;
}

Contributors
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Tokens
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CommitProp
Linus Torvalds (pre-git)
567
51.08%
3
12.00%
Stephen Hemminger
402
36.22%
16
64.00%
Xin Long
66
5.95%
1
4.00%
Eric W. Biedermann
64
5.77%
1
4.00%
Al Viro
3
0.27%
1
4.00%
Nikolay Aleksandrov
3
0.27%
1
4.00%
Scott Feldman
3
0.27%
1
4.00%
Panagiotis Issaris
2
0.18%
1
4.00%
Total
1110
100.00%
25
100.00%



static int old_deviceless(struct net *net, void __user *uarg)
{
	unsigned long args[3];

	if (copy_from_user(args, uarg, sizeof(args)))
		return -EFAULT;

	switch (args[0]) {
	case BRCTL_GET_VERSION:
		return BRCTL_VERSION;

	case BRCTL_GET_BRIDGES:
	{
		int *indices;
		int ret = 0;

		if (args[2] >= 2048)
			return -ENOMEM;
		indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
		if (indices == NULL)
			return -ENOMEM;

		args[2] = get_bridge_ifindices(net, indices, args[2]);

		ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
			? -EFAULT : args[2];

		kfree(indices);
		return ret;
	}

	case BRCTL_ADD_BRIDGE:
	case BRCTL_DEL_BRIDGE:
	{
		char buf[IFNAMSIZ];

		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
			return -EFAULT;

		buf[IFNAMSIZ-1] = 0;

		if (args[0] == BRCTL_ADD_BRIDGE)
			return br_add_bridge(net, buf);

		return br_del_bridge(net, buf);
	}
	}

	return -EOPNOTSUPP;
}

Contributors
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Tokens
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Commits
CommitProp
Stephen Hemminger
114
43.68%
4
36.36%
Linus Torvalds (pre-git)
111
42.53%
2
18.18%
Alan Cox
13
4.98%
1
9.09%
Alexey Dobriyan
11
4.21%
1
9.09%
Eric W. Biedermann
5
1.92%
1
9.09%
Al Viro
5
1.92%
1
9.09%
Panagiotis Issaris
2
0.77%
1
9.09%
Total
261
100.00%
11
100.00%



int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
{
	switch (cmd) {
	case SIOCGIFBR:
	case SIOCSIFBR:
		return old_deviceless(net, uarg);

	case SIOCBRADDBR:
	case SIOCBRDELBR:
	{
		char buf[IFNAMSIZ];

		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		if (copy_from_user(buf, uarg, IFNAMSIZ))
			return -EFAULT;

		buf[IFNAMSIZ-1] = 0;
		if (cmd == SIOCBRADDBR)
			return br_add_bridge(net, buf);

		return br_del_bridge(net, buf);
	}
	}
	return -EOPNOTSUPP;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
100
84.03%
1
20.00%
Eric W. Biedermann
10
8.40%
2
40.00%
Alexey Dobriyan
6
5.04%
1
20.00%
Al Viro
3
2.52%
1
20.00%
Total
119
100.00%
5
100.00%



int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct net_bridge *br = netdev_priv(dev);

	switch (cmd) {
	case SIOCDEVPRIVATE:
		return old_dev_ioctl(dev, rq, cmd);

	case SIOCBRADDIF:
	case SIOCBRDELIF:
		return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);

	}

	br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
	return -EOPNOTSUPP;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
80
100.00%
2
100.00%
Total
80
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
991
50.56%
18
46.15%
Linus Torvalds (pre-git)
700
35.71%
3
7.69%
Eric W. Biedermann
102
5.20%
2
5.13%
Xin Long
66
3.37%
1
2.56%
Alexey Dobriyan
23
1.17%
1
2.56%
Chris Wright
17
0.87%
1
2.56%
Alan Cox
13
0.66%
1
2.56%
Al Viro
11
0.56%
1
2.56%
Nikolay Aleksandrov
10
0.51%
2
5.13%
Pavel Emelyanov
9
0.46%
1
2.56%
Panagiotis Issaris
4
0.20%
1
2.56%
Scott Feldman
3
0.15%
1
2.56%
Tejun Heo
3
0.15%
1
2.56%
Randy Dunlap
3
0.15%
1
2.56%
Eric Dumazet
2
0.10%
1
2.56%
Linus Torvalds
1
0.05%
1
2.56%
Adrian Bunk
1
0.05%
1
2.56%
Lucas De Marchi
1
0.05%
1
2.56%
Total
1960
100.00%
39
100.00%
Directory: net/bridge

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