[mirror_ubuntu-artful-kernel.git] / drivers / net / macvtap_main.c

#include <linux/etherdevice.h>
#include <linux/if_macvlan.h>
#include <linux/if_macvtap.h>
#include <linux/if_vlan.h>
#include <linux/interrupt.h>
#include <linux/nsproxy.h>
#include <linux/compat.h>
#include <linux/if_tun.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/cdev.h>
#include <linux/idr.h>
#include <linux/fs.h>
#include <linux/uio.h>

#include <net/net_namespace.h>
#include <net/rtnetlink.h>
#include <net/sock.h>
#include <linux/virtio_net.h>
#include <linux/skb_array.h>

/*
 * Variables for dealing with macvtaps device numbers.
 */
static dev_t macvtap_major;
#define MACVTAP_NUM_DEVS (1U << MINORBITS)

static const void *macvtap_net_namespace(struct device *d)
{
	struct net_device *dev = to_net_dev(d->parent);
	return dev_net(dev);
}

static struct class macvtap_class = {
	.name = "macvtap",
	.owner = THIS_MODULE,
	.ns_type = &net_ns_type_operations,
	.namespace = macvtap_net_namespace,
};
static struct cdev macvtap_cdev;

#define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
		      NETIF_F_TSO6 | NETIF_F_UFO)

static int macvtap_newlink(struct net *src_net,
			   struct net_device *dev,
			   struct nlattr *tb[],
			   struct nlattr *data[])
{
	struct macvlan_dev *vlan = netdev_priv(dev);
	int err;

	INIT_LIST_HEAD(&vlan->queue_list);

	/* Since macvlan supports all offloads by default, make
	 * tap support all offloads also.
	 */
	vlan->tap_features = TUN_OFFLOADS;

	err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan);
	if (err)
		return err;

	/* Don't put anything that may fail after macvlan_common_newlink
	 * because we can't undo what it does.
	 */
	err = macvlan_common_newlink(src_net, dev, tb, data);
	if (err) {
		netdev_rx_handler_unregister(dev);
		return err;
	}

	return 0;
}

static void macvtap_dellink(struct net_device *dev,
			    struct list_head *head)
{
	netdev_rx_handler_unregister(dev);
	macvtap_del_queues(dev);
	macvlan_dellink(dev, head);
}

static void macvtap_setup(struct net_device *dev)
{
	macvlan_common_setup(dev);
	dev->tx_queue_len = TUN_READQ_SIZE;
}

static struct rtnl_link_ops macvtap_link_ops __read_mostly = {
	.kind		= "macvtap",
	.setup		= macvtap_setup,
	.newlink	= macvtap_newlink,
	.dellink	= macvtap_dellink,
};

static int macvtap_device_event(struct notifier_block *unused,
				unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct macvlan_dev *vlan;
	struct device *classdev;
	dev_t devt;
	int err;
	char tap_name[IFNAMSIZ];

	if (dev->rtnl_link_ops != &macvtap_link_ops)
		return NOTIFY_DONE;

	snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex);
	vlan = netdev_priv(dev);

	switch (event) {
	case NETDEV_REGISTER:
		/* Create the device node here after the network device has
		 * been registered but before register_netdevice has
		 * finished running.
		 */
		err = macvtap_get_minor(vlan);
		if (err)
			return notifier_from_errno(err);

		devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
		classdev = device_create(&macvtap_class, &dev->dev, devt,
					 dev, tap_name);
		if (IS_ERR(classdev)) {
			macvtap_free_minor(vlan);
			return notifier_from_errno(PTR_ERR(classdev));
		}
		err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj,
					tap_name);
		if (err)
			return notifier_from_errno(err);
		break;
	case NETDEV_UNREGISTER:
		/* vlan->minor == 0 if NETDEV_REGISTER above failed */
		if (vlan->minor == 0)
			break;
		sysfs_remove_link(&dev->dev.kobj, tap_name);
		devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
		device_destroy(&macvtap_class, devt);
		macvtap_free_minor(vlan);
		break;
	case NETDEV_CHANGE_TX_QUEUE_LEN:
		if (macvtap_queue_resize(vlan))
			return NOTIFY_BAD;
		break;
	}

	return NOTIFY_DONE;
}

static struct notifier_block macvtap_notifier_block __read_mostly = {
	.notifier_call	= macvtap_device_event,
};

extern struct file_operations macvtap_fops;
static int macvtap_init(void)
{
	int err;

	err = alloc_chrdev_region(&macvtap_major, 0,
				MACVTAP_NUM_DEVS, "macvtap");
	if (err)
		goto out1;

	cdev_init(&macvtap_cdev, &macvtap_fops);
	err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS);
	if (err)
		goto out2;

	err = class_register(&macvtap_class);
	if (err)
		goto out3;

	err = register_netdevice_notifier(&macvtap_notifier_block);
	if (err)
		goto out4;

	err = macvlan_link_register(&macvtap_link_ops);
	if (err)
		goto out5;

	return 0;

out5:
	unregister_netdevice_notifier(&macvtap_notifier_block);
out4:
	class_unregister(&macvtap_class);
out3:
	cdev_del(&macvtap_cdev);
out2:
	unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
out1:
	return err;
}
module_init(macvtap_init);

extern struct idr minor_idr;
static void macvtap_exit(void)
{
	rtnl_link_unregister(&macvtap_link_ops);
	unregister_netdevice_notifier(&macvtap_notifier_block);
	class_unregister(&macvtap_class);
	cdev_del(&macvtap_cdev);
	unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
	idr_destroy(&minor_idr);
}
module_exit(macvtap_exit);

MODULE_ALIAS_RTNL_LINK("macvtap");
MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
MODULE_LICENSE("GPL");
Commit	Line	Data
a8e04698 SG	1	#include <linux/etherdevice.h>
	2	#include <linux/if_macvlan.h>
	3	#include <linux/if_macvtap.h>
	4	#include <linux/if_vlan.h>
	5	#include <linux/interrupt.h>
	6	#include <linux/nsproxy.h>
	7	#include <linux/compat.h>
	8	#include <linux/if_tun.h>
	9	#include <linux/module.h>
	10	#include <linux/skbuff.h>
	11	#include <linux/cache.h>
	12	#include <linux/sched.h>
	13	#include <linux/types.h>
	14	#include <linux/slab.h>
	15	#include <linux/wait.h>
	16	#include <linux/cdev.h>
	17	#include <linux/idr.h>
	18	#include <linux/fs.h>
	19	#include <linux/uio.h>
	20
	21	#include <net/net_namespace.h>
	22	#include <net/rtnetlink.h>
	23	#include <net/sock.h>
	24	#include <linux/virtio_net.h>
	25	#include <linux/skb_array.h>
	26
	27	/*
	28	* Variables for dealing with macvtaps device numbers.
	29	*/
	30	static dev_t macvtap_major;
	31	#define MACVTAP_NUM_DEVS (1U << MINORBITS)
	32
	33	static const void macvtap_net_namespace(struct device d)
	34	{
	35	struct net_device *dev = to_net_dev(d->parent);
	36	return dev_net(dev);
	37	}
	38
	39	static struct class macvtap_class = {
	40	.name = "macvtap",
	41	.owner = THIS_MODULE,
	42	.ns_type = &net_ns_type_operations,
	43	.namespace = macvtap_net_namespace,
	44	};
	45	static struct cdev macvtap_cdev;
	46
	47	#define TUN_OFFLOADS (NETIF_F_HW_CSUM \| NETIF_F_TSO_ECN \| NETIF_F_TSO \| \
	48	NETIF_F_TSO6 \| NETIF_F_UFO)
	49
	50	static int macvtap_newlink(struct net *src_net,
	51	struct net_device *dev,
	52	struct nlattr *tb[],
	53	struct nlattr *data[])
	54	{
	55	struct macvlan_dev *vlan = netdev_priv(dev);
	56	int err;
	57
	58	INIT_LIST_HEAD(&vlan->queue_list);
	59
	60	/* Since macvlan supports all offloads by default, make
	61	* tap support all offloads also.
	62	*/
	63	vlan->tap_features = TUN_OFFLOADS;
	64
65	err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan);
66	if (err)
67	return err;
68
69	/* Don't put anything that may fail after macvlan_common_newlink
70	* because we can't undo what it does.
71	*/
72	err = macvlan_common_newlink(src_net, dev, tb, data);
73	if (err) {
74	netdev_rx_handler_unregister(dev);
75	return err;
76	}
77
78	return 0;
79	}
80
81	static void macvtap_dellink(struct net_device *dev,
82	struct list_head *head)
83	{
84	netdev_rx_handler_unregister(dev);
85	macvtap_del_queues(dev);
86	macvlan_dellink(dev, head);
87	}
88
89	static void macvtap_setup(struct net_device *dev)
90	{
91	macvlan_common_setup(dev);
92	dev->tx_queue_len = TUN_READQ_SIZE;
93	}
94
95	static struct rtnl_link_ops macvtap_link_ops __read_mostly = {
96	.kind = "macvtap",
97	.setup = macvtap_setup,
98	.newlink = macvtap_newlink,
99	.dellink = macvtap_dellink,
100	};
101
102	static int macvtap_device_event(struct notifier_block *unused,
103	unsigned long event, void *ptr)
104	{
105	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
106	struct macvlan_dev *vlan;
107	struct device *classdev;
108	dev_t devt;
109	int err;
110	char tap_name[IFNAMSIZ];
111
112	if (dev->rtnl_link_ops != &macvtap_link_ops)
113	return NOTIFY_DONE;
114
115	snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex);
116	vlan = netdev_priv(dev);
117
118	switch (event) {
119	case NETDEV_REGISTER:
120	/* Create the device node here after the network device has
121	* been registered but before register_netdevice has
122	* finished running.
123	*/
124	err = macvtap_get_minor(vlan);
125	if (err)
126	return notifier_from_errno(err);
127
128	devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
129	classdev = device_create(&macvtap_class, &dev->dev, devt,
130	dev, tap_name);
131	if (IS_ERR(classdev)) {
132	macvtap_free_minor(vlan);
133	return notifier_from_errno(PTR_ERR(classdev));
134	}
135	err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj,
136	tap_name);
137	if (err)
138	return notifier_from_errno(err);
139	break;
140	case NETDEV_UNREGISTER:
141	/* vlan->minor == 0 if NETDEV_REGISTER above failed */
142	if (vlan->minor == 0)
143	break;
144	sysfs_remove_link(&dev->dev.kobj, tap_name);
145	devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
146	device_destroy(&macvtap_class, devt);
147	macvtap_free_minor(vlan);
148	break;
149	case NETDEV_CHANGE_TX_QUEUE_LEN:
150	if (macvtap_queue_resize(vlan))
151	return NOTIFY_BAD;
152	break;
153	}
154
155	return NOTIFY_DONE;
156	}
157
158	static struct notifier_block macvtap_notifier_block __read_mostly = {
159	.notifier_call = macvtap_device_event,
160	};
161
162	extern struct file_operations macvtap_fops;
163	static int macvtap_init(void)
164	{
165	int err;
166
167	err = alloc_chrdev_region(&macvtap_major, 0,
168	MACVTAP_NUM_DEVS, "macvtap");
169	if (err)
170	goto out1;
171
172	cdev_init(&macvtap_cdev, &macvtap_fops);
173	err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS);
174	if (err)
175	goto out2;
176
177	err = class_register(&macvtap_class);
178	if (err)
179	goto out3;
180
181	err = register_netdevice_notifier(&macvtap_notifier_block);
182	if (err)
183	goto out4;
184
185	err = macvlan_link_register(&macvtap_link_ops);
186	if (err)
187	goto out5;
188
189	return 0;
190
191	out5:
192	unregister_netdevice_notifier(&macvtap_notifier_block);
193	out4:
194	class_unregister(&macvtap_class);
195	out3:
196	cdev_del(&macvtap_cdev);
197	out2:
198	unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
199	out1:
200	return err;
201	}
202	module_init(macvtap_init);
203
204	extern struct idr minor_idr;
205	static void macvtap_exit(void)
206	{
207	rtnl_link_unregister(&macvtap_link_ops);
208	unregister_netdevice_notifier(&macvtap_notifier_block);
209	class_unregister(&macvtap_class);
210	cdev_del(&macvtap_cdev);
211	unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
212	idr_destroy(&minor_idr);
213	}
214	module_exit(macvtap_exit);
215
216	MODULE_ALIAS_RTNL_LINK("macvtap");
217	MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
218	MODULE_LICENSE("GPL");