summaryrefslogtreecommitdiffstats
path: root/drivers/net/ipvlan/ipvtap.c
blob: ef02f2cf5ce13d9a3db210f83b801f1a3fde0976 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/etherdevice.h>
#include "ipvlan.h"
#include <linux/if_vlan.h>
#include <linux/if_tap.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>

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

static dev_t ipvtap_major;
static struct cdev ipvtap_cdev;

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

static struct class ipvtap_class = {
	 .name = "ipvtap",
	 .owner = THIS_MODULE,
	 .ns_type = &net_ns_type_operations,
	 .namespace = ipvtap_net_namespace,
};

struct ipvtap_dev {
	struct ipvl_dev vlan;
	struct tap_dev	  tap;
};

static void ipvtap_count_tx_dropped(struct tap_dev *tap)
{
	struct ipvtap_dev *vlantap = container_of(tap, struct ipvtap_dev, tap);
	struct ipvl_dev *vlan = &vlantap->vlan;

	this_cpu_inc(vlan->pcpu_stats->tx_drps);
}

static void ipvtap_count_rx_dropped(struct tap_dev *tap)
{
	struct ipvtap_dev *vlantap = container_of(tap, struct ipvtap_dev, tap);
	struct ipvl_dev *vlan = &vlantap->vlan;

	ipvlan_count_rx(vlan, 0, 0, 0);
}

static void ipvtap_update_features(struct tap_dev *tap,
				   netdev_features_t features)
{
	struct ipvtap_dev *vlantap = container_of(tap, struct ipvtap_dev, tap);
	struct ipvl_dev *vlan = &vlantap->vlan;

	vlan->sfeatures = features;
	netdev_update_features(vlan->dev);
}

static int ipvtap_newlink(struct net *src_net, struct net_device *dev,
			  struct nlattr *tb[], struct nlattr *data[],
			  struct netlink_ext_ack *extack)
{
	struct ipvtap_dev *vlantap = netdev_priv(dev);
	int err;

	INIT_LIST_HEAD(&vlantap->tap.queue_list);

	/* Since macvlan supports all offloads by default, make
	 * tap support all offloads also.
	 */
	vlantap->tap.tap_features = TUN_OFFLOADS;
	vlantap->tap.count_tx_dropped = ipvtap_count_tx_dropped;
	vlantap->tap.update_features =	ipvtap_update_features;
	vlantap->tap.count_rx_dropped = ipvtap_count_rx_dropped;

	err = netdev_rx_handler_register(dev, tap_handle_frame, &vlantap->tap);
	if (err)
		return err;

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

	vlantap->tap.dev = vlantap->vlan.dev;

	return err;
}

static void ipvtap_dellink(struct net_device *dev,
			   struct list_head *head)
{
	struct ipvtap_dev *vlan = netdev_priv(dev);

	netdev_rx_handler_unregister(dev);
	tap_del_queues(&vlan->tap);
	ipvlan_link_delete(dev, head);
}

static void ipvtap_setup(struct net_device *dev)
{
	ipvlan_link_setup(dev);
	dev->tx_queue_len = TUN_READQ_SIZE;
	dev->priv_flags &= ~IFF_NO_QUEUE;
}

static struct rtnl_link_ops ipvtap_link_ops __read_mostly = {
	.kind		= "ipvtap",
	.setup		= ipvtap_setup,
	.newlink	= ipvtap_newlink,
	.dellink	= ipvtap_dellink,
	.priv_size	= sizeof(struct ipvtap_dev),
};

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

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

	snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex);
	vlantap = 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 = tap_get_minor(ipvtap_major, &vlantap->tap);
		if (err)
			return notifier_from_errno(err);

		devt = MKDEV(MAJOR(ipvtap_major), vlantap->tap.minor);
		classdev = device_create(&ipvtap_class, &dev->dev, devt,
					 dev, "%s", tap_name);
		if (IS_ERR(classdev)) {
			tap_free_minor(ipvtap_major, &vlantap->tap);
			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 (vlantap->tap.minor == 0)
			break;
		sysfs_remove_link(&dev->dev.kobj, tap_name);
		devt = MKDEV(MAJOR(ipvtap_major), vlantap->tap.minor);
		device_destroy(&ipvtap_class, devt);
		tap_free_minor(ipvtap_major, &vlantap->tap);
		break;
	case NETDEV_CHANGE_TX_QUEUE_LEN:
		if (tap_queue_resize(&vlantap->tap))
			return NOTIFY_BAD;
		break;
	}

	return NOTIFY_DONE;
}

static struct notifier_block ipvtap_notifier_block __read_mostly = {
	.notifier_call	= ipvtap_device_event,
};

static int ipvtap_init(void)
{
	int err;

	err = tap_create_cdev(&ipvtap_cdev, &ipvtap_major, "ipvtap",
			      THIS_MODULE);
	if (err)
		goto out1;

	err = class_register(&ipvtap_class);
	if (err)
		goto out2;

	err = register_netdevice_notifier(&ipvtap_notifier_block);
	if (err)
		goto out3;

	err = ipvlan_link_register(&ipvtap_link_ops);
	if (err)
		goto out4;

	return 0;

out4:
	unregister_netdevice_notifier(&ipvtap_notifier_block);
out3:
	class_unregister(&ipvtap_class);
out2:
	tap_destroy_cdev(ipvtap_major, &ipvtap_cdev);
out1:
	return err;
}
module_init(ipvtap_init);

static void ipvtap_exit(void)
{
	rtnl_link_unregister(&ipvtap_link_ops);
	unregister_netdevice_notifier(&ipvtap_notifier_block);
	class_unregister(&ipvtap_class);
	tap_destroy_cdev(ipvtap_major, &ipvtap_cdev);
}
module_exit(ipvtap_exit);
MODULE_ALIAS_RTNL_LINK("ipvtap");
MODULE_AUTHOR("Sainath Grandhi <sainath.grandhi@intel.com>");
MODULE_LICENSE("GPL");