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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a8e04698 SG |
2 | #include <linux/etherdevice.h> |
3 | #include <linux/if_macvlan.h> | |
635b8c8e | 4 | #include <linux/if_tap.h> |
a8e04698 SG |
5 | #include <linux/if_vlan.h> |
6 | #include <linux/interrupt.h> | |
7 | #include <linux/nsproxy.h> | |
8 | #include <linux/compat.h> | |
9 | #include <linux/if_tun.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/cache.h> | |
174cd4b1 | 13 | #include <linux/sched/signal.h> |
a8e04698 SG |
14 | #include <linux/types.h> |
15 | #include <linux/slab.h> | |
16 | #include <linux/wait.h> | |
17 | #include <linux/cdev.h> | |
18 | #include <linux/idr.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/uio.h> | |
21 | ||
22 | #include <net/net_namespace.h> | |
23 | #include <net/rtnetlink.h> | |
24 | #include <net/sock.h> | |
25 | #include <linux/virtio_net.h> | |
26 | #include <linux/skb_array.h> | |
27 | ||
6fe3faf8 SG |
28 | struct macvtap_dev { |
29 | struct macvlan_dev vlan; | |
30 | struct tap_dev tap; | |
31 | }; | |
32 | ||
a8e04698 SG |
33 | /* |
34 | * Variables for dealing with macvtaps device numbers. | |
35 | */ | |
36 | static dev_t macvtap_major; | |
a8e04698 SG |
37 | |
38 | static const void *macvtap_net_namespace(struct device *d) | |
39 | { | |
40 | struct net_device *dev = to_net_dev(d->parent); | |
41 | return dev_net(dev); | |
42 | } | |
43 | ||
44 | static struct class macvtap_class = { | |
45 | .name = "macvtap", | |
46 | .owner = THIS_MODULE, | |
47 | .ns_type = &net_ns_type_operations, | |
48 | .namespace = macvtap_net_namespace, | |
49 | }; | |
50 | static struct cdev macvtap_cdev; | |
51 | ||
52 | #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \ | |
fb652fdf | 53 | NETIF_F_TSO6) |
a8e04698 | 54 | |
6fe3faf8 SG |
55 | static void macvtap_count_tx_dropped(struct tap_dev *tap) |
56 | { | |
57 | struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap); | |
58 | struct macvlan_dev *vlan = &vlantap->vlan; | |
59 | ||
60 | this_cpu_inc(vlan->pcpu_stats->tx_dropped); | |
61 | } | |
62 | ||
63 | static void macvtap_count_rx_dropped(struct tap_dev *tap) | |
64 | { | |
65 | struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap); | |
66 | struct macvlan_dev *vlan = &vlantap->vlan; | |
67 | ||
68 | macvlan_count_rx(vlan, 0, 0, 0); | |
69 | } | |
70 | ||
71 | static void macvtap_update_features(struct tap_dev *tap, | |
72 | netdev_features_t features) | |
73 | { | |
74 | struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap); | |
75 | struct macvlan_dev *vlan = &vlantap->vlan; | |
76 | ||
77 | vlan->set_features = features; | |
78 | netdev_update_features(vlan->dev); | |
79 | } | |
80 | ||
7a3f4a18 MS |
81 | static int macvtap_newlink(struct net *src_net, struct net_device *dev, |
82 | struct nlattr *tb[], struct nlattr *data[], | |
83 | struct netlink_ext_ack *extack) | |
a8e04698 | 84 | { |
6fe3faf8 | 85 | struct macvtap_dev *vlantap = netdev_priv(dev); |
a8e04698 SG |
86 | int err; |
87 | ||
6fe3faf8 | 88 | INIT_LIST_HEAD(&vlantap->tap.queue_list); |
a8e04698 SG |
89 | |
90 | /* Since macvlan supports all offloads by default, make | |
91 | * tap support all offloads also. | |
92 | */ | |
6fe3faf8 | 93 | vlantap->tap.tap_features = TUN_OFFLOADS; |
a8e04698 | 94 | |
6fe3faf8 SG |
95 | /* Register callbacks for rx/tx drops accounting and updating |
96 | * net_device features | |
97 | */ | |
98 | vlantap->tap.count_tx_dropped = macvtap_count_tx_dropped; | |
99 | vlantap->tap.count_rx_dropped = macvtap_count_rx_dropped; | |
100 | vlantap->tap.update_features = macvtap_update_features; | |
101 | ||
102 | err = netdev_rx_handler_register(dev, tap_handle_frame, &vlantap->tap); | |
a8e04698 SG |
103 | if (err) |
104 | return err; | |
105 | ||
106 | /* Don't put anything that may fail after macvlan_common_newlink | |
107 | * because we can't undo what it does. | |
108 | */ | |
42ab19ee | 109 | err = macvlan_common_newlink(src_net, dev, tb, data, extack); |
a8e04698 SG |
110 | if (err) { |
111 | netdev_rx_handler_unregister(dev); | |
112 | return err; | |
113 | } | |
114 | ||
6fe3faf8 SG |
115 | vlantap->tap.dev = vlantap->vlan.dev; |
116 | ||
a8e04698 SG |
117 | return 0; |
118 | } | |
119 | ||
120 | static void macvtap_dellink(struct net_device *dev, | |
121 | struct list_head *head) | |
122 | { | |
6fe3faf8 SG |
123 | struct macvtap_dev *vlantap = netdev_priv(dev); |
124 | ||
a8e04698 | 125 | netdev_rx_handler_unregister(dev); |
6fe3faf8 | 126 | tap_del_queues(&vlantap->tap); |
a8e04698 SG |
127 | macvlan_dellink(dev, head); |
128 | } | |
129 | ||
130 | static void macvtap_setup(struct net_device *dev) | |
131 | { | |
132 | macvlan_common_setup(dev); | |
133 | dev->tx_queue_len = TUN_READQ_SIZE; | |
134 | } | |
135 | ||
136 | static struct rtnl_link_ops macvtap_link_ops __read_mostly = { | |
137 | .kind = "macvtap", | |
138 | .setup = macvtap_setup, | |
139 | .newlink = macvtap_newlink, | |
140 | .dellink = macvtap_dellink, | |
6fe3faf8 | 141 | .priv_size = sizeof(struct macvtap_dev), |
a8e04698 SG |
142 | }; |
143 | ||
144 | static int macvtap_device_event(struct notifier_block *unused, | |
145 | unsigned long event, void *ptr) | |
146 | { | |
147 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
6fe3faf8 | 148 | struct macvtap_dev *vlantap; |
a8e04698 SG |
149 | struct device *classdev; |
150 | dev_t devt; | |
151 | int err; | |
152 | char tap_name[IFNAMSIZ]; | |
153 | ||
154 | if (dev->rtnl_link_ops != &macvtap_link_ops) | |
155 | return NOTIFY_DONE; | |
156 | ||
157 | snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex); | |
6fe3faf8 | 158 | vlantap = netdev_priv(dev); |
a8e04698 SG |
159 | |
160 | switch (event) { | |
161 | case NETDEV_REGISTER: | |
162 | /* Create the device node here after the network device has | |
163 | * been registered but before register_netdevice has | |
164 | * finished running. | |
165 | */ | |
d9f1f61c | 166 | err = tap_get_minor(macvtap_major, &vlantap->tap); |
a8e04698 SG |
167 | if (err) |
168 | return notifier_from_errno(err); | |
169 | ||
6fe3faf8 | 170 | devt = MKDEV(MAJOR(macvtap_major), vlantap->tap.minor); |
a8e04698 SG |
171 | classdev = device_create(&macvtap_class, &dev->dev, devt, |
172 | dev, tap_name); | |
173 | if (IS_ERR(classdev)) { | |
d9f1f61c | 174 | tap_free_minor(macvtap_major, &vlantap->tap); |
a8e04698 SG |
175 | return notifier_from_errno(PTR_ERR(classdev)); |
176 | } | |
177 | err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj, | |
178 | tap_name); | |
179 | if (err) | |
180 | return notifier_from_errno(err); | |
181 | break; | |
182 | case NETDEV_UNREGISTER: | |
183 | /* vlan->minor == 0 if NETDEV_REGISTER above failed */ | |
6fe3faf8 | 184 | if (vlantap->tap.minor == 0) |
a8e04698 SG |
185 | break; |
186 | sysfs_remove_link(&dev->dev.kobj, tap_name); | |
6fe3faf8 | 187 | devt = MKDEV(MAJOR(macvtap_major), vlantap->tap.minor); |
a8e04698 | 188 | device_destroy(&macvtap_class, devt); |
d9f1f61c | 189 | tap_free_minor(macvtap_major, &vlantap->tap); |
a8e04698 SG |
190 | break; |
191 | case NETDEV_CHANGE_TX_QUEUE_LEN: | |
6fe3faf8 | 192 | if (tap_queue_resize(&vlantap->tap)) |
a8e04698 SG |
193 | return NOTIFY_BAD; |
194 | break; | |
195 | } | |
196 | ||
197 | return NOTIFY_DONE; | |
198 | } | |
199 | ||
200 | static struct notifier_block macvtap_notifier_block __read_mostly = { | |
201 | .notifier_call = macvtap_device_event, | |
202 | }; | |
203 | ||
a8e04698 SG |
204 | static int macvtap_init(void) |
205 | { | |
206 | int err; | |
207 | ||
dea6e19f GM |
208 | err = tap_create_cdev(&macvtap_cdev, &macvtap_major, "macvtap", |
209 | THIS_MODULE); | |
a8e04698 | 210 | if (err) |
ebc05ba7 | 211 | goto out1; |
a8e04698 SG |
212 | |
213 | err = class_register(&macvtap_class); | |
214 | if (err) | |
ebc05ba7 | 215 | goto out2; |
a8e04698 SG |
216 | |
217 | err = register_netdevice_notifier(&macvtap_notifier_block); | |
218 | if (err) | |
ebc05ba7 | 219 | goto out3; |
a8e04698 SG |
220 | |
221 | err = macvlan_link_register(&macvtap_link_ops); | |
222 | if (err) | |
ebc05ba7 | 223 | goto out4; |
a8e04698 SG |
224 | |
225 | return 0; | |
226 | ||
a8e04698 | 227 | out4: |
ebc05ba7 | 228 | unregister_netdevice_notifier(&macvtap_notifier_block); |
a8e04698 | 229 | out3: |
ebc05ba7 | 230 | class_unregister(&macvtap_class); |
a8e04698 | 231 | out2: |
ebc05ba7 | 232 | tap_destroy_cdev(macvtap_major, &macvtap_cdev); |
a8e04698 SG |
233 | out1: |
234 | return err; | |
235 | } | |
236 | module_init(macvtap_init); | |
237 | ||
a8e04698 SG |
238 | static void macvtap_exit(void) |
239 | { | |
240 | rtnl_link_unregister(&macvtap_link_ops); | |
241 | unregister_netdevice_notifier(&macvtap_notifier_block); | |
242 | class_unregister(&macvtap_class); | |
ebc05ba7 | 243 | tap_destroy_cdev(macvtap_major, &macvtap_cdev); |
a8e04698 SG |
244 | } |
245 | module_exit(macvtap_exit); | |
246 | ||
247 | MODULE_ALIAS_RTNL_LINK("macvtap"); | |
248 | MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); | |
249 | MODULE_LICENSE("GPL"); |