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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET 802.1Q VLAN | |
3 | * Ethernet-type device handling. | |
4 | * | |
5 | * Authors: Ben Greear <greearb@candelatech.com> | |
ad712087 | 6 | * Please send support related email to: netdev@vger.kernel.org |
1da177e4 | 7 | * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html |
122952fc | 8 | * |
1da177e4 LT |
9 | * Fixes: |
10 | * Fix for packet capture - Nick Eggleston <nick@dccinc.com>; | |
11 | * Add HW acceleration hooks - David S. Miller <davem@redhat.com>; | |
12 | * Correct all the locking - David S. Miller <davem@redhat.com>; | |
13 | * Use hash table for VLAN groups - David S. Miller <davem@redhat.com> | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | */ | |
20 | ||
21 | #include <asm/uaccess.h> /* for copy_from_user */ | |
4fc268d2 | 22 | #include <linux/capability.h> |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <net/datalink.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/init.h> | |
30 | #include <net/p8022.h> | |
31 | #include <net/arp.h> | |
32 | #include <linux/rtnetlink.h> | |
33 | #include <linux/notifier.h> | |
e9dc8653 | 34 | #include <net/net_namespace.h> |
1da177e4 LT |
35 | |
36 | #include <linux/if_vlan.h> | |
37 | #include "vlan.h" | |
38 | #include "vlanproc.h" | |
39 | ||
40 | #define DRV_VERSION "1.8" | |
41 | ||
42 | /* Global VLAN variables */ | |
43 | ||
44 | /* Our listing of VLAN group(s) */ | |
45 | static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE]; | |
1da177e4 LT |
46 | |
47 | static char vlan_fullname[] = "802.1Q VLAN Support"; | |
48 | static char vlan_version[] = DRV_VERSION; | |
49 | static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>"; | |
50 | static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>"; | |
51 | ||
1da177e4 LT |
52 | /* Determines interface naming scheme. */ |
53 | unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; | |
54 | ||
55 | static struct packet_type vlan_packet_type = { | |
56 | .type = __constant_htons(ETH_P_8021Q), | |
57 | .func = vlan_skb_recv, /* VLAN receive method */ | |
58 | }; | |
59 | ||
1da177e4 LT |
60 | /* End of global variables definitions. */ |
61 | ||
2029cc2c PM |
62 | static inline unsigned int vlan_grp_hashfn(unsigned int idx) |
63 | { | |
64 | return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK; | |
65 | } | |
66 | ||
1da177e4 | 67 | /* Must be invoked with RCU read lock (no preempt) */ |
a9fde260 | 68 | static struct vlan_group *__vlan_find_group(struct net_device *real_dev) |
1da177e4 LT |
69 | { |
70 | struct vlan_group *grp; | |
71 | struct hlist_node *n; | |
a9fde260 | 72 | int hash = vlan_grp_hashfn(real_dev->ifindex); |
1da177e4 LT |
73 | |
74 | hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) { | |
a9fde260 | 75 | if (grp->real_dev == real_dev) |
1da177e4 LT |
76 | return grp; |
77 | } | |
78 | ||
79 | return NULL; | |
80 | } | |
81 | ||
82 | /* Find the protocol handler. Assumes VID < VLAN_VID_MASK. | |
83 | * | |
84 | * Must be invoked with RCU read lock (no preempt) | |
85 | */ | |
86 | struct net_device *__find_vlan_dev(struct net_device *real_dev, | |
87 | unsigned short VID) | |
88 | { | |
a9fde260 | 89 | struct vlan_group *grp = __vlan_find_group(real_dev); |
1da177e4 LT |
90 | |
91 | if (grp) | |
5c15bdec | 92 | return vlan_group_get_device(grp, VID); |
1da177e4 LT |
93 | |
94 | return NULL; | |
95 | } | |
96 | ||
5c15bdec DA |
97 | static void vlan_group_free(struct vlan_group *grp) |
98 | { | |
99 | int i; | |
100 | ||
2029cc2c | 101 | for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) |
5c15bdec DA |
102 | kfree(grp->vlan_devices_arrays[i]); |
103 | kfree(grp); | |
104 | } | |
105 | ||
a9fde260 | 106 | static struct vlan_group *vlan_group_alloc(struct net_device *real_dev) |
42429aae PM |
107 | { |
108 | struct vlan_group *grp; | |
42429aae PM |
109 | |
110 | grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL); | |
111 | if (!grp) | |
112 | return NULL; | |
113 | ||
a9fde260 | 114 | grp->real_dev = real_dev; |
42429aae | 115 | hlist_add_head_rcu(&grp->hlist, |
a9fde260 | 116 | &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]); |
42429aae | 117 | return grp; |
67727184 | 118 | } |
42429aae | 119 | |
67727184 PE |
120 | static int vlan_group_prealloc_vid(struct vlan_group *vg, int vid) |
121 | { | |
122 | struct net_device **array; | |
123 | unsigned int size; | |
124 | ||
125 | ASSERT_RTNL(); | |
126 | ||
127 | array = vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN]; | |
128 | if (array != NULL) | |
129 | return 0; | |
130 | ||
131 | size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN; | |
132 | array = kzalloc(size, GFP_KERNEL); | |
133 | if (array == NULL) | |
134 | return -ENOBUFS; | |
135 | ||
136 | vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN] = array; | |
137 | return 0; | |
42429aae PM |
138 | } |
139 | ||
1da177e4 LT |
140 | static void vlan_rcu_free(struct rcu_head *rcu) |
141 | { | |
5c15bdec | 142 | vlan_group_free(container_of(rcu, struct vlan_group, rcu)); |
1da177e4 LT |
143 | } |
144 | ||
af301517 | 145 | void unregister_vlan_dev(struct net_device *dev) |
1da177e4 | 146 | { |
9dfebcc6 | 147 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
af301517 | 148 | struct net_device *real_dev = vlan->real_dev; |
1da177e4 | 149 | struct vlan_group *grp; |
af301517 | 150 | unsigned short vlan_id = vlan->vlan_id; |
1da177e4 LT |
151 | |
152 | ASSERT_RTNL(); | |
acc5efbc | 153 | |
a9fde260 | 154 | grp = __vlan_find_group(real_dev); |
af301517 | 155 | BUG_ON(!grp); |
acc5efbc PM |
156 | |
157 | vlan_proc_rem_dev(dev); | |
158 | ||
159 | /* Take it out of our own structures, but be sure to interlock with | |
160 | * HW accelerating devices or SW vlan input packet processing. | |
161 | */ | |
162 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) | |
163 | real_dev->vlan_rx_kill_vid(real_dev, vlan_id); | |
1da177e4 | 164 | |
acc5efbc | 165 | vlan_group_set_device(grp, vlan_id, NULL); |
af301517 | 166 | grp->nr_vlans--; |
acc5efbc | 167 | |
af301517 | 168 | synchronize_net(); |
acc5efbc PM |
169 | |
170 | /* If the group is now empty, kill off the group. */ | |
af301517 | 171 | if (grp->nr_vlans == 0) { |
acc5efbc PM |
172 | if (real_dev->features & NETIF_F_HW_VLAN_RX) |
173 | real_dev->vlan_rx_register(real_dev, NULL); | |
174 | ||
175 | hlist_del_rcu(&grp->hlist); | |
1da177e4 | 176 | |
acc5efbc PM |
177 | /* Free the group, after all cpu's are done. */ |
178 | call_rcu(&grp->rcu, vlan_rcu_free); | |
1da177e4 LT |
179 | } |
180 | ||
af301517 PM |
181 | /* Get rid of the vlan's reference to real_dev */ |
182 | dev_put(real_dev); | |
1da177e4 | 183 | |
c17d8874 | 184 | unregister_netdevice(dev); |
1da177e4 LT |
185 | } |
186 | ||
2029cc2c PM |
187 | static void vlan_transfer_operstate(const struct net_device *dev, |
188 | struct net_device *vlandev) | |
ddd7bf9f SR |
189 | { |
190 | /* Have to respect userspace enforced dormant state | |
191 | * of real device, also must allow supplicant running | |
192 | * on VLAN device | |
193 | */ | |
194 | if (dev->operstate == IF_OPER_DORMANT) | |
195 | netif_dormant_on(vlandev); | |
196 | else | |
197 | netif_dormant_off(vlandev); | |
198 | ||
199 | if (netif_carrier_ok(dev)) { | |
200 | if (!netif_carrier_ok(vlandev)) | |
201 | netif_carrier_on(vlandev); | |
202 | } else { | |
203 | if (netif_carrier_ok(vlandev)) | |
204 | netif_carrier_off(vlandev); | |
205 | } | |
206 | } | |
207 | ||
07b5b17e | 208 | int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id) |
1da177e4 | 209 | { |
40f98e1a PM |
210 | char *name = real_dev->name; |
211 | ||
1da177e4 | 212 | if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { |
40f98e1a | 213 | pr_info("8021q: VLANs not supported on %s\n", name); |
c1d3ee99 | 214 | return -EOPNOTSUPP; |
1da177e4 LT |
215 | } |
216 | ||
217 | if ((real_dev->features & NETIF_F_HW_VLAN_RX) && | |
d2d1acdb | 218 | !real_dev->vlan_rx_register) { |
40f98e1a | 219 | pr_info("8021q: device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 220 | return -EOPNOTSUPP; |
1da177e4 LT |
221 | } |
222 | ||
223 | if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) && | |
d2d1acdb | 224 | (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) { |
40f98e1a | 225 | pr_info("8021q: Device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 226 | return -EOPNOTSUPP; |
1da177e4 LT |
227 | } |
228 | ||
1da177e4 LT |
229 | /* The real device must be up and operating in order to |
230 | * assosciate a VLAN device with it. | |
231 | */ | |
232 | if (!(real_dev->flags & IFF_UP)) | |
c1d3ee99 | 233 | return -ENETDOWN; |
1da177e4 | 234 | |
40f98e1a | 235 | if (__find_vlan_dev(real_dev, vlan_id) != NULL) |
c1d3ee99 | 236 | return -EEXIST; |
1da177e4 | 237 | |
c1d3ee99 PM |
238 | return 0; |
239 | } | |
240 | ||
07b5b17e | 241 | int register_vlan_dev(struct net_device *dev) |
e89fe42c | 242 | { |
9dfebcc6 | 243 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
e89fe42c PM |
244 | struct net_device *real_dev = vlan->real_dev; |
245 | unsigned short vlan_id = vlan->vlan_id; | |
246 | struct vlan_group *grp, *ngrp = NULL; | |
247 | int err; | |
248 | ||
a9fde260 | 249 | grp = __vlan_find_group(real_dev); |
e89fe42c | 250 | if (!grp) { |
a9fde260 | 251 | ngrp = grp = vlan_group_alloc(real_dev); |
e89fe42c PM |
252 | if (!grp) |
253 | return -ENOBUFS; | |
254 | } | |
255 | ||
67727184 PE |
256 | err = vlan_group_prealloc_vid(grp, vlan_id); |
257 | if (err < 0) | |
258 | goto out_free_group; | |
259 | ||
e89fe42c PM |
260 | err = register_netdevice(dev); |
261 | if (err < 0) | |
262 | goto out_free_group; | |
263 | ||
264 | /* Account for reference in struct vlan_dev_info */ | |
265 | dev_hold(real_dev); | |
266 | ||
267 | vlan_transfer_operstate(real_dev, dev); | |
268 | linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ | |
269 | ||
270 | /* So, got the sucker initialized, now lets place | |
271 | * it into our local structure. | |
272 | */ | |
273 | vlan_group_set_device(grp, vlan_id, dev); | |
af301517 PM |
274 | grp->nr_vlans++; |
275 | ||
e89fe42c PM |
276 | if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX) |
277 | real_dev->vlan_rx_register(real_dev, ngrp); | |
278 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) | |
279 | real_dev->vlan_rx_add_vid(real_dev, vlan_id); | |
280 | ||
281 | if (vlan_proc_add_dev(dev) < 0) | |
40f98e1a PM |
282 | pr_warning("8021q: failed to add proc entry for %s\n", |
283 | dev->name); | |
e89fe42c PM |
284 | return 0; |
285 | ||
286 | out_free_group: | |
287 | if (ngrp) | |
288 | vlan_group_free(ngrp); | |
289 | return err; | |
290 | } | |
291 | ||
c1d3ee99 | 292 | /* Attach a VLAN device to a mac address (ie Ethernet Card). |
2ae0bf69 | 293 | * Returns 0 if the device was created or a negative error code otherwise. |
c1d3ee99 | 294 | */ |
2ae0bf69 PM |
295 | static int register_vlan_device(struct net_device *real_dev, |
296 | unsigned short VLAN_ID) | |
c1d3ee99 | 297 | { |
c1d3ee99 PM |
298 | struct net_device *new_dev; |
299 | char name[IFNAMSIZ]; | |
2ae0bf69 | 300 | int err; |
c1d3ee99 | 301 | |
c1d3ee99 | 302 | if (VLAN_ID >= VLAN_VID_MASK) |
2ae0bf69 | 303 | return -ERANGE; |
c1d3ee99 | 304 | |
2ae0bf69 PM |
305 | err = vlan_check_real_dev(real_dev, VLAN_ID); |
306 | if (err < 0) | |
307 | return err; | |
c1d3ee99 | 308 | |
1da177e4 | 309 | /* Gotta set up the fields for the device. */ |
1da177e4 LT |
310 | switch (vlan_name_type) { |
311 | case VLAN_NAME_TYPE_RAW_PLUS_VID: | |
312 | /* name will look like: eth1.0005 */ | |
313 | snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID); | |
314 | break; | |
315 | case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: | |
316 | /* Put our vlan.VID in the name. | |
317 | * Name will look like: vlan5 | |
318 | */ | |
319 | snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID); | |
320 | break; | |
321 | case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: | |
322 | /* Put our vlan.VID in the name. | |
323 | * Name will look like: eth0.5 | |
324 | */ | |
325 | snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID); | |
326 | break; | |
327 | case VLAN_NAME_TYPE_PLUS_VID: | |
328 | /* Put our vlan.VID in the name. | |
329 | * Name will look like: vlan0005 | |
330 | */ | |
331 | default: | |
332 | snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID); | |
3ff50b79 | 333 | } |
122952fc | 334 | |
1da177e4 LT |
335 | new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, |
336 | vlan_setup); | |
5dd8d1e9 | 337 | |
1da177e4 | 338 | if (new_dev == NULL) |
2ae0bf69 | 339 | return -ENOBUFS; |
1da177e4 | 340 | |
1da177e4 LT |
341 | /* need 4 bytes for extra VLAN header info, |
342 | * hope the underlying device can handle it. | |
343 | */ | |
344 | new_dev->mtu = real_dev->mtu; | |
345 | ||
9dfebcc6 PM |
346 | vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */ |
347 | vlan_dev_info(new_dev)->real_dev = real_dev; | |
348 | vlan_dev_info(new_dev)->dent = NULL; | |
349 | vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR; | |
1da177e4 | 350 | |
07b5b17e | 351 | new_dev->rtnl_link_ops = &vlan_link_ops; |
2ae0bf69 PM |
352 | err = register_vlan_dev(new_dev); |
353 | if (err < 0) | |
e89fe42c | 354 | goto out_free_newdev; |
1da177e4 | 355 | |
2ae0bf69 | 356 | return 0; |
1da177e4 | 357 | |
1da177e4 LT |
358 | out_free_newdev: |
359 | free_netdev(new_dev); | |
2ae0bf69 | 360 | return err; |
1da177e4 LT |
361 | } |
362 | ||
8c979c26 PM |
363 | static void vlan_sync_address(struct net_device *dev, |
364 | struct net_device *vlandev) | |
365 | { | |
9dfebcc6 | 366 | struct vlan_dev_info *vlan = vlan_dev_info(vlandev); |
8c979c26 PM |
367 | |
368 | /* May be called without an actual change */ | |
369 | if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr)) | |
370 | return; | |
371 | ||
372 | /* vlan address was different from the old address and is equal to | |
373 | * the new address */ | |
374 | if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
375 | !compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
376 | dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN); | |
377 | ||
378 | /* vlan address was equal to the old address and is different from | |
379 | * the new address */ | |
380 | if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
381 | compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
382 | dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN); | |
383 | ||
384 | memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); | |
385 | } | |
386 | ||
802fb176 PE |
387 | static void __vlan_device_event(struct net_device *dev, unsigned long event) |
388 | { | |
389 | switch (event) { | |
390 | case NETDEV_CHANGENAME: | |
391 | vlan_proc_rem_dev(dev); | |
392 | if (vlan_proc_add_dev(dev) < 0) | |
393 | pr_warning("8021q: failed to change proc name for %s\n", | |
394 | dev->name); | |
395 | break; | |
396 | } | |
397 | } | |
398 | ||
2029cc2c PM |
399 | static int vlan_device_event(struct notifier_block *unused, unsigned long event, |
400 | void *ptr) | |
1da177e4 LT |
401 | { |
402 | struct net_device *dev = ptr; | |
802fb176 | 403 | struct vlan_group *grp; |
1da177e4 LT |
404 | int i, flgs; |
405 | struct net_device *vlandev; | |
406 | ||
c346dca1 | 407 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
408 | return NOTIFY_DONE; |
409 | ||
802fb176 PE |
410 | if (is_vlan_dev(dev)) { |
411 | __vlan_device_event(dev, event); | |
412 | goto out; | |
413 | } | |
414 | ||
a9fde260 | 415 | grp = __vlan_find_group(dev); |
1da177e4 LT |
416 | if (!grp) |
417 | goto out; | |
418 | ||
419 | /* It is OK that we do not hold the group lock right now, | |
420 | * as we run under the RTNL lock. | |
421 | */ | |
422 | ||
423 | switch (event) { | |
424 | case NETDEV_CHANGE: | |
425 | /* Propagate real device state to vlan devices */ | |
1da177e4 | 426 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { |
5c15bdec | 427 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
428 | if (!vlandev) |
429 | continue; | |
430 | ||
ddd7bf9f | 431 | vlan_transfer_operstate(dev, vlandev); |
1da177e4 LT |
432 | } |
433 | break; | |
434 | ||
8c979c26 PM |
435 | case NETDEV_CHANGEADDR: |
436 | /* Adjust unicast filters on underlying device */ | |
437 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
438 | vlandev = vlan_group_get_device(grp, i); | |
439 | if (!vlandev) | |
440 | continue; | |
441 | ||
d932e04a PM |
442 | flgs = vlandev->flags; |
443 | if (!(flgs & IFF_UP)) | |
444 | continue; | |
445 | ||
8c979c26 PM |
446 | vlan_sync_address(dev, vlandev); |
447 | } | |
448 | break; | |
449 | ||
1da177e4 LT |
450 | case NETDEV_DOWN: |
451 | /* Put all VLANs for this dev in the down state too. */ | |
452 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 453 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
454 | if (!vlandev) |
455 | continue; | |
456 | ||
457 | flgs = vlandev->flags; | |
458 | if (!(flgs & IFF_UP)) | |
459 | continue; | |
460 | ||
461 | dev_change_flags(vlandev, flgs & ~IFF_UP); | |
462 | } | |
463 | break; | |
464 | ||
465 | case NETDEV_UP: | |
466 | /* Put all VLANs for this dev in the up state too. */ | |
467 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 468 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
469 | if (!vlandev) |
470 | continue; | |
122952fc | 471 | |
1da177e4 LT |
472 | flgs = vlandev->flags; |
473 | if (flgs & IFF_UP) | |
474 | continue; | |
475 | ||
476 | dev_change_flags(vlandev, flgs | IFF_UP); | |
477 | } | |
478 | break; | |
122952fc | 479 | |
1da177e4 LT |
480 | case NETDEV_UNREGISTER: |
481 | /* Delete all VLANs for this dev. */ | |
482 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 483 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
484 | if (!vlandev) |
485 | continue; | |
486 | ||
af301517 PM |
487 | /* unregistration of last vlan destroys group, abort |
488 | * afterwards */ | |
489 | if (grp->nr_vlans == 1) | |
490 | i = VLAN_GROUP_ARRAY_LEN; | |
1da177e4 | 491 | |
af301517 | 492 | unregister_vlan_dev(vlandev); |
1da177e4 LT |
493 | } |
494 | break; | |
3ff50b79 | 495 | } |
1da177e4 LT |
496 | |
497 | out: | |
498 | return NOTIFY_DONE; | |
499 | } | |
500 | ||
69ab4b7d PM |
501 | static struct notifier_block vlan_notifier_block __read_mostly = { |
502 | .notifier_call = vlan_device_event, | |
503 | }; | |
504 | ||
1da177e4 LT |
505 | /* |
506 | * VLAN IOCTL handler. | |
507 | * o execute requested action or pass command to the device driver | |
508 | * arg is really a struct vlan_ioctl_args __user *. | |
509 | */ | |
881d966b | 510 | static int vlan_ioctl_handler(struct net *net, void __user *arg) |
1da177e4 | 511 | { |
c17d8874 | 512 | int err; |
1da177e4 LT |
513 | unsigned short vid = 0; |
514 | struct vlan_ioctl_args args; | |
c17d8874 | 515 | struct net_device *dev = NULL; |
1da177e4 LT |
516 | |
517 | if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) | |
518 | return -EFAULT; | |
519 | ||
520 | /* Null terminate this sucker, just in case. */ | |
521 | args.device1[23] = 0; | |
522 | args.u.device2[23] = 0; | |
523 | ||
c17d8874 PM |
524 | rtnl_lock(); |
525 | ||
1da177e4 LT |
526 | switch (args.cmd) { |
527 | case SET_VLAN_INGRESS_PRIORITY_CMD: | |
c17d8874 PM |
528 | case SET_VLAN_EGRESS_PRIORITY_CMD: |
529 | case SET_VLAN_FLAG_CMD: | |
530 | case ADD_VLAN_CMD: | |
531 | case DEL_VLAN_CMD: | |
532 | case GET_VLAN_REALDEV_NAME_CMD: | |
533 | case GET_VLAN_VID_CMD: | |
534 | err = -ENODEV; | |
881d966b | 535 | dev = __dev_get_by_name(&init_net, args.device1); |
c17d8874 PM |
536 | if (!dev) |
537 | goto out; | |
538 | ||
539 | err = -EINVAL; | |
540 | if (args.cmd != ADD_VLAN_CMD && | |
541 | !(dev->priv_flags & IFF_802_1Q_VLAN)) | |
542 | goto out; | |
543 | } | |
544 | ||
545 | switch (args.cmd) { | |
546 | case SET_VLAN_INGRESS_PRIORITY_CMD: | |
547 | err = -EPERM; | |
1da177e4 | 548 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
549 | break; |
550 | vlan_dev_set_ingress_priority(dev, | |
551 | args.u.skb_priority, | |
552 | args.vlan_qos); | |
fffe470a | 553 | err = 0; |
1da177e4 LT |
554 | break; |
555 | ||
556 | case SET_VLAN_EGRESS_PRIORITY_CMD: | |
c17d8874 | 557 | err = -EPERM; |
1da177e4 | 558 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
559 | break; |
560 | err = vlan_dev_set_egress_priority(dev, | |
1da177e4 LT |
561 | args.u.skb_priority, |
562 | args.vlan_qos); | |
563 | break; | |
564 | ||
565 | case SET_VLAN_FLAG_CMD: | |
c17d8874 | 566 | err = -EPERM; |
1da177e4 | 567 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
568 | break; |
569 | err = vlan_dev_set_vlan_flag(dev, | |
1da177e4 LT |
570 | args.u.flag, |
571 | args.vlan_qos); | |
572 | break; | |
573 | ||
574 | case SET_VLAN_NAME_TYPE_CMD: | |
c17d8874 | 575 | err = -EPERM; |
1da177e4 | 576 | if (!capable(CAP_NET_ADMIN)) |
e35de026 | 577 | break; |
c17d8874 PM |
578 | if ((args.u.name_type >= 0) && |
579 | (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { | |
1da177e4 LT |
580 | vlan_name_type = args.u.name_type; |
581 | err = 0; | |
582 | } else { | |
583 | err = -EINVAL; | |
584 | } | |
585 | break; | |
586 | ||
587 | case ADD_VLAN_CMD: | |
c17d8874 | 588 | err = -EPERM; |
1da177e4 | 589 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 | 590 | break; |
2ae0bf69 | 591 | err = register_vlan_device(dev, args.u.VID); |
1da177e4 LT |
592 | break; |
593 | ||
594 | case DEL_VLAN_CMD: | |
c17d8874 | 595 | err = -EPERM; |
1da177e4 | 596 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 | 597 | break; |
af301517 PM |
598 | unregister_vlan_dev(dev); |
599 | err = 0; | |
1da177e4 LT |
600 | break; |
601 | ||
1da177e4 | 602 | case GET_VLAN_REALDEV_NAME_CMD: |
3f5f4346 | 603 | err = 0; |
c17d8874 | 604 | vlan_dev_get_realdev_name(dev, args.u.device2); |
1da177e4 | 605 | if (copy_to_user(arg, &args, |
2029cc2c | 606 | sizeof(struct vlan_ioctl_args))) |
1da177e4 | 607 | err = -EFAULT; |
1da177e4 LT |
608 | break; |
609 | ||
610 | case GET_VLAN_VID_CMD: | |
3f5f4346 | 611 | err = 0; |
c17d8874 | 612 | vlan_dev_get_vid(dev, &vid); |
1da177e4 LT |
613 | args.u.VID = vid; |
614 | if (copy_to_user(arg, &args, | |
2029cc2c | 615 | sizeof(struct vlan_ioctl_args))) |
122952fc | 616 | err = -EFAULT; |
1da177e4 LT |
617 | break; |
618 | ||
619 | default: | |
198a291c | 620 | err = -EOPNOTSUPP; |
c17d8874 | 621 | break; |
3ff50b79 | 622 | } |
7eb1b3d3 | 623 | out: |
c17d8874 | 624 | rtnl_unlock(); |
1da177e4 LT |
625 | return err; |
626 | } | |
627 | ||
69ab4b7d PM |
628 | static int __init vlan_proto_init(void) |
629 | { | |
630 | int err; | |
631 | ||
632 | pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); | |
633 | pr_info("All bugs added by %s\n", vlan_buggyright); | |
634 | ||
635 | err = vlan_proc_init(); | |
636 | if (err < 0) | |
637 | goto err1; | |
638 | ||
639 | err = register_netdevice_notifier(&vlan_notifier_block); | |
640 | if (err < 0) | |
641 | goto err2; | |
642 | ||
643 | err = vlan_netlink_init(); | |
644 | if (err < 0) | |
645 | goto err3; | |
646 | ||
647 | dev_add_pack(&vlan_packet_type); | |
648 | vlan_ioctl_set(vlan_ioctl_handler); | |
649 | return 0; | |
650 | ||
651 | err3: | |
652 | unregister_netdevice_notifier(&vlan_notifier_block); | |
653 | err2: | |
654 | vlan_proc_cleanup(); | |
655 | err1: | |
656 | return err; | |
657 | } | |
658 | ||
659 | static void __exit vlan_cleanup_module(void) | |
660 | { | |
661 | unsigned int i; | |
662 | ||
663 | vlan_ioctl_set(NULL); | |
664 | vlan_netlink_fini(); | |
665 | ||
666 | unregister_netdevice_notifier(&vlan_notifier_block); | |
667 | ||
668 | dev_remove_pack(&vlan_packet_type); | |
669 | ||
670 | /* This table must be empty if there are no module references left. */ | |
671 | for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) | |
672 | BUG_ON(!hlist_empty(&vlan_group_hash[i])); | |
673 | ||
674 | vlan_proc_cleanup(); | |
675 | ||
676 | synchronize_net(); | |
677 | } | |
678 | ||
679 | module_init(vlan_proto_init); | |
680 | module_exit(vlan_cleanup_module); | |
681 | ||
1da177e4 LT |
682 | MODULE_LICENSE("GPL"); |
683 | MODULE_VERSION(DRV_VERSION); |