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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
235a9d89 SG |
2 | #include <linux/etherdevice.h> |
3 | #include "ipvlan.h" | |
4 | #include <linux/if_vlan.h> | |
5 | #include <linux/if_tap.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> | |
13 | #include <linux/sched.h> | |
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 | ||
27 | #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \ | |
182e0b6b | 28 | NETIF_F_TSO6) |
235a9d89 SG |
29 | |
30 | static dev_t ipvtap_major; | |
31 | static struct cdev ipvtap_cdev; | |
32 | ||
33 | static const void *ipvtap_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 ipvtap_class = { | |
40 | .name = "ipvtap", | |
41 | .owner = THIS_MODULE, | |
42 | .ns_type = &net_ns_type_operations, | |
43 | .namespace = ipvtap_net_namespace, | |
44 | }; | |
45 | ||
46 | struct ipvtap_dev { | |
47 | struct ipvl_dev vlan; | |
48 | struct tap_dev tap; | |
49 | }; | |
50 | ||
51 | static void ipvtap_count_tx_dropped(struct tap_dev *tap) | |
52 | { | |
53 | struct ipvtap_dev *vlantap = container_of(tap, struct ipvtap_dev, tap); | |
54 | struct ipvl_dev *vlan = &vlantap->vlan; | |
55 | ||
56 | this_cpu_inc(vlan->pcpu_stats->tx_drps); | |
57 | } | |
58 | ||
59 | static void ipvtap_count_rx_dropped(struct tap_dev *tap) | |
60 | { | |
61 | struct ipvtap_dev *vlantap = container_of(tap, struct ipvtap_dev, tap); | |
62 | struct ipvl_dev *vlan = &vlantap->vlan; | |
63 | ||
64 | ipvlan_count_rx(vlan, 0, 0, 0); | |
65 | } | |
66 | ||
67 | static void ipvtap_update_features(struct tap_dev *tap, | |
68 | netdev_features_t features) | |
69 | { | |
70 | struct ipvtap_dev *vlantap = container_of(tap, struct ipvtap_dev, tap); | |
71 | struct ipvl_dev *vlan = &vlantap->vlan; | |
72 | ||
73 | vlan->sfeatures = features; | |
74 | netdev_update_features(vlan->dev); | |
75 | } | |
76 | ||
7a3f4a18 MS |
77 | static int ipvtap_newlink(struct net *src_net, struct net_device *dev, |
78 | struct nlattr *tb[], struct nlattr *data[], | |
79 | struct netlink_ext_ack *extack) | |
235a9d89 SG |
80 | { |
81 | struct ipvtap_dev *vlantap = netdev_priv(dev); | |
82 | int err; | |
83 | ||
84 | INIT_LIST_HEAD(&vlantap->tap.queue_list); | |
85 | ||
86 | /* Since macvlan supports all offloads by default, make | |
87 | * tap support all offloads also. | |
88 | */ | |
89 | vlantap->tap.tap_features = TUN_OFFLOADS; | |
90 | vlantap->tap.count_tx_dropped = ipvtap_count_tx_dropped; | |
91 | vlantap->tap.update_features = ipvtap_update_features; | |
92 | vlantap->tap.count_rx_dropped = ipvtap_count_rx_dropped; | |
93 | ||
94 | err = netdev_rx_handler_register(dev, tap_handle_frame, &vlantap->tap); | |
95 | if (err) | |
96 | return err; | |
97 | ||
98 | /* Don't put anything that may fail after macvlan_common_newlink | |
99 | * because we can't undo what it does. | |
100 | */ | |
7a3f4a18 | 101 | err = ipvlan_link_new(src_net, dev, tb, data, extack); |
235a9d89 SG |
102 | if (err) { |
103 | netdev_rx_handler_unregister(dev); | |
104 | return err; | |
105 | } | |
106 | ||
107 | vlantap->tap.dev = vlantap->vlan.dev; | |
108 | ||
109 | return err; | |
110 | } | |
111 | ||
112 | static void ipvtap_dellink(struct net_device *dev, | |
113 | struct list_head *head) | |
114 | { | |
115 | struct ipvtap_dev *vlan = netdev_priv(dev); | |
116 | ||
117 | netdev_rx_handler_unregister(dev); | |
118 | tap_del_queues(&vlan->tap); | |
119 | ipvlan_link_delete(dev, head); | |
120 | } | |
121 | ||
122 | static void ipvtap_setup(struct net_device *dev) | |
123 | { | |
124 | ipvlan_link_setup(dev); | |
125 | dev->tx_queue_len = TUN_READQ_SIZE; | |
126 | dev->priv_flags &= ~IFF_NO_QUEUE; | |
127 | } | |
128 | ||
129 | static struct rtnl_link_ops ipvtap_link_ops __read_mostly = { | |
130 | .kind = "ipvtap", | |
131 | .setup = ipvtap_setup, | |
132 | .newlink = ipvtap_newlink, | |
133 | .dellink = ipvtap_dellink, | |
134 | .priv_size = sizeof(struct ipvtap_dev), | |
135 | }; | |
136 | ||
137 | static int ipvtap_device_event(struct notifier_block *unused, | |
138 | unsigned long event, void *ptr) | |
139 | { | |
140 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
141 | struct ipvtap_dev *vlantap; | |
142 | struct device *classdev; | |
143 | dev_t devt; | |
144 | int err; | |
145 | char tap_name[IFNAMSIZ]; | |
146 | ||
147 | if (dev->rtnl_link_ops != &ipvtap_link_ops) | |
148 | return NOTIFY_DONE; | |
149 | ||
150 | snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex); | |
151 | vlantap = netdev_priv(dev); | |
152 | ||
153 | switch (event) { | |
154 | case NETDEV_REGISTER: | |
155 | /* Create the device node here after the network device has | |
156 | * been registered but before register_netdevice has | |
157 | * finished running. | |
158 | */ | |
159 | err = tap_get_minor(ipvtap_major, &vlantap->tap); | |
160 | if (err) | |
161 | return notifier_from_errno(err); | |
162 | ||
163 | devt = MKDEV(MAJOR(ipvtap_major), vlantap->tap.minor); | |
164 | classdev = device_create(&ipvtap_class, &dev->dev, devt, | |
165 | dev, tap_name); | |
166 | if (IS_ERR(classdev)) { | |
167 | tap_free_minor(ipvtap_major, &vlantap->tap); | |
168 | return notifier_from_errno(PTR_ERR(classdev)); | |
169 | } | |
170 | err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj, | |
171 | tap_name); | |
172 | if (err) | |
173 | return notifier_from_errno(err); | |
174 | break; | |
175 | case NETDEV_UNREGISTER: | |
176 | /* vlan->minor == 0 if NETDEV_REGISTER above failed */ | |
177 | if (vlantap->tap.minor == 0) | |
178 | break; | |
179 | sysfs_remove_link(&dev->dev.kobj, tap_name); | |
180 | devt = MKDEV(MAJOR(ipvtap_major), vlantap->tap.minor); | |
181 | device_destroy(&ipvtap_class, devt); | |
182 | tap_free_minor(ipvtap_major, &vlantap->tap); | |
183 | break; | |
184 | case NETDEV_CHANGE_TX_QUEUE_LEN: | |
185 | if (tap_queue_resize(&vlantap->tap)) | |
186 | return NOTIFY_BAD; | |
187 | break; | |
188 | } | |
189 | ||
190 | return NOTIFY_DONE; | |
191 | } | |
192 | ||
193 | static struct notifier_block ipvtap_notifier_block __read_mostly = { | |
194 | .notifier_call = ipvtap_device_event, | |
195 | }; | |
196 | ||
197 | static int ipvtap_init(void) | |
198 | { | |
199 | int err; | |
200 | ||
dea6e19f GM |
201 | err = tap_create_cdev(&ipvtap_cdev, &ipvtap_major, "ipvtap", |
202 | THIS_MODULE); | |
235a9d89 SG |
203 | if (err) |
204 | goto out1; | |
205 | ||
206 | err = class_register(&ipvtap_class); | |
207 | if (err) | |
208 | goto out2; | |
209 | ||
210 | err = register_netdevice_notifier(&ipvtap_notifier_block); | |
211 | if (err) | |
212 | goto out3; | |
213 | ||
214 | err = ipvlan_link_register(&ipvtap_link_ops); | |
215 | if (err) | |
216 | goto out4; | |
217 | ||
218 | return 0; | |
219 | ||
220 | out4: | |
221 | unregister_netdevice_notifier(&ipvtap_notifier_block); | |
222 | out3: | |
223 | class_unregister(&ipvtap_class); | |
224 | out2: | |
225 | tap_destroy_cdev(ipvtap_major, &ipvtap_cdev); | |
226 | out1: | |
227 | return err; | |
228 | } | |
229 | module_init(ipvtap_init); | |
230 | ||
231 | static void ipvtap_exit(void) | |
232 | { | |
233 | rtnl_link_unregister(&ipvtap_link_ops); | |
234 | unregister_netdevice_notifier(&ipvtap_notifier_block); | |
235 | class_unregister(&ipvtap_class); | |
236 | tap_destroy_cdev(ipvtap_major, &ipvtap_cdev); | |
237 | } | |
238 | module_exit(ipvtap_exit); | |
239 | MODULE_ALIAS_RTNL_LINK("ipvtap"); | |
240 | MODULE_AUTHOR("Sainath Grandhi <sainath.grandhi@intel.com>"); | |
241 | MODULE_LICENSE("GPL"); |