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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> | |
6 | * Please send support related email to: vlan@scry.wanfear.com | |
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]; | |
46 | #define vlan_grp_hashfn(IDX) ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK) | |
47 | ||
48 | static char vlan_fullname[] = "802.1Q VLAN Support"; | |
49 | static char vlan_version[] = DRV_VERSION; | |
50 | static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>"; | |
51 | static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>"; | |
52 | ||
1da177e4 LT |
53 | /* Determines interface naming scheme. */ |
54 | unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; | |
55 | ||
56 | static struct packet_type vlan_packet_type = { | |
57 | .type = __constant_htons(ETH_P_8021Q), | |
58 | .func = vlan_skb_recv, /* VLAN receive method */ | |
59 | }; | |
60 | ||
1da177e4 LT |
61 | /* End of global variables definitions. */ |
62 | ||
1da177e4 LT |
63 | /* Must be invoked with RCU read lock (no preempt) */ |
64 | static struct vlan_group *__vlan_find_group(int real_dev_ifindex) | |
65 | { | |
66 | struct vlan_group *grp; | |
67 | struct hlist_node *n; | |
68 | int hash = vlan_grp_hashfn(real_dev_ifindex); | |
69 | ||
70 | hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) { | |
71 | if (grp->real_dev_ifindex == real_dev_ifindex) | |
72 | return grp; | |
73 | } | |
74 | ||
75 | return NULL; | |
76 | } | |
77 | ||
78 | /* Find the protocol handler. Assumes VID < VLAN_VID_MASK. | |
79 | * | |
80 | * Must be invoked with RCU read lock (no preempt) | |
81 | */ | |
82 | struct net_device *__find_vlan_dev(struct net_device *real_dev, | |
83 | unsigned short VID) | |
84 | { | |
85 | struct vlan_group *grp = __vlan_find_group(real_dev->ifindex); | |
86 | ||
87 | if (grp) | |
5c15bdec | 88 | return vlan_group_get_device(grp, VID); |
1da177e4 LT |
89 | |
90 | return NULL; | |
91 | } | |
92 | ||
5c15bdec DA |
93 | static void vlan_group_free(struct vlan_group *grp) |
94 | { | |
95 | int i; | |
96 | ||
97 | for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) | |
98 | kfree(grp->vlan_devices_arrays[i]); | |
99 | kfree(grp); | |
100 | } | |
101 | ||
42429aae PM |
102 | static struct vlan_group *vlan_group_alloc(int ifindex) |
103 | { | |
104 | struct vlan_group *grp; | |
105 | unsigned int size; | |
106 | unsigned int i; | |
107 | ||
108 | grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL); | |
109 | if (!grp) | |
110 | return NULL; | |
111 | ||
112 | size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN; | |
113 | ||
114 | for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) { | |
115 | grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL); | |
116 | if (!grp->vlan_devices_arrays[i]) | |
117 | goto err; | |
118 | } | |
119 | ||
120 | grp->real_dev_ifindex = ifindex; | |
121 | hlist_add_head_rcu(&grp->hlist, | |
122 | &vlan_group_hash[vlan_grp_hashfn(ifindex)]); | |
123 | return grp; | |
124 | ||
125 | err: | |
126 | vlan_group_free(grp); | |
127 | return NULL; | |
128 | } | |
129 | ||
1da177e4 LT |
130 | static void vlan_rcu_free(struct rcu_head *rcu) |
131 | { | |
5c15bdec | 132 | vlan_group_free(container_of(rcu, struct vlan_group, rcu)); |
1da177e4 LT |
133 | } |
134 | ||
135 | ||
136 | /* This returns 0 if everything went fine. | |
137 | * It will return 1 if the group was killed as a result. | |
138 | * A negative return indicates failure. | |
139 | * | |
140 | * The RTNL lock must be held. | |
141 | */ | |
142 | static int unregister_vlan_dev(struct net_device *real_dev, | |
143 | unsigned short vlan_id) | |
144 | { | |
acc5efbc | 145 | struct net_device *dev; |
1da177e4 LT |
146 | int real_dev_ifindex = real_dev->ifindex; |
147 | struct vlan_group *grp; | |
acc5efbc PM |
148 | unsigned int i; |
149 | int ret; | |
1da177e4 | 150 | |
1da177e4 LT |
151 | if (vlan_id >= VLAN_VID_MASK) |
152 | return -EINVAL; | |
153 | ||
154 | ASSERT_RTNL(); | |
155 | grp = __vlan_find_group(real_dev_ifindex); | |
acc5efbc PM |
156 | if (!grp) |
157 | return -ENOENT; | |
158 | ||
159 | dev = vlan_group_get_device(grp, vlan_id); | |
160 | if (!dev) | |
161 | return -ENOENT; | |
162 | ||
163 | vlan_proc_rem_dev(dev); | |
164 | ||
165 | /* Take it out of our own structures, but be sure to interlock with | |
166 | * HW accelerating devices or SW vlan input packet processing. | |
167 | */ | |
168 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) | |
169 | real_dev->vlan_rx_kill_vid(real_dev, vlan_id); | |
1da177e4 | 170 | |
acc5efbc PM |
171 | vlan_group_set_device(grp, vlan_id, NULL); |
172 | synchronize_net(); | |
173 | ||
174 | /* Caller unregisters (and if necessary, puts) VLAN device, but we | |
175 | * get rid of the reference to real_dev here. | |
176 | */ | |
177 | dev_put(real_dev); | |
178 | ||
179 | /* If the group is now empty, kill off the group. */ | |
1da177e4 | 180 | ret = 0; |
acc5efbc PM |
181 | for (i = 0; i < VLAN_VID_MASK; i++) |
182 | if (vlan_group_get_device(grp, i)) | |
183 | break; | |
184 | ||
185 | if (i == VLAN_VID_MASK) { | |
186 | if (real_dev->features & NETIF_F_HW_VLAN_RX) | |
187 | real_dev->vlan_rx_register(real_dev, NULL); | |
188 | ||
189 | hlist_del_rcu(&grp->hlist); | |
1da177e4 | 190 | |
acc5efbc PM |
191 | /* Free the group, after all cpu's are done. */ |
192 | call_rcu(&grp->rcu, vlan_rcu_free); | |
193 | ret = 1; | |
1da177e4 LT |
194 | } |
195 | ||
122952fc | 196 | return ret; |
1da177e4 LT |
197 | } |
198 | ||
07b5b17e | 199 | int unregister_vlan_device(struct net_device *dev) |
1da177e4 | 200 | { |
1da177e4 LT |
201 | int ret; |
202 | ||
c17d8874 PM |
203 | ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev, |
204 | VLAN_DEV_INFO(dev)->vlan_id); | |
205 | unregister_netdevice(dev); | |
1da177e4 | 206 | |
c17d8874 PM |
207 | if (ret == 1) |
208 | ret = 0; | |
1da177e4 LT |
209 | return ret; |
210 | } | |
211 | ||
ddd7bf9f SR |
212 | static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev) |
213 | { | |
214 | /* Have to respect userspace enforced dormant state | |
215 | * of real device, also must allow supplicant running | |
216 | * on VLAN device | |
217 | */ | |
218 | if (dev->operstate == IF_OPER_DORMANT) | |
219 | netif_dormant_on(vlandev); | |
220 | else | |
221 | netif_dormant_off(vlandev); | |
222 | ||
223 | if (netif_carrier_ok(dev)) { | |
224 | if (!netif_carrier_ok(vlandev)) | |
225 | netif_carrier_on(vlandev); | |
226 | } else { | |
227 | if (netif_carrier_ok(vlandev)) | |
228 | netif_carrier_off(vlandev); | |
229 | } | |
230 | } | |
231 | ||
07b5b17e | 232 | int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id) |
1da177e4 | 233 | { |
40f98e1a PM |
234 | char *name = real_dev->name; |
235 | ||
1da177e4 | 236 | if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { |
40f98e1a | 237 | pr_info("8021q: VLANs not supported on %s\n", name); |
c1d3ee99 | 238 | return -EOPNOTSUPP; |
1da177e4 LT |
239 | } |
240 | ||
241 | if ((real_dev->features & NETIF_F_HW_VLAN_RX) && | |
d2d1acdb | 242 | !real_dev->vlan_rx_register) { |
40f98e1a | 243 | pr_info("8021q: device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 244 | return -EOPNOTSUPP; |
1da177e4 LT |
245 | } |
246 | ||
247 | if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) && | |
d2d1acdb | 248 | (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) { |
40f98e1a | 249 | pr_info("8021q: Device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 250 | return -EOPNOTSUPP; |
1da177e4 LT |
251 | } |
252 | ||
1da177e4 LT |
253 | /* The real device must be up and operating in order to |
254 | * assosciate a VLAN device with it. | |
255 | */ | |
256 | if (!(real_dev->flags & IFF_UP)) | |
c1d3ee99 | 257 | return -ENETDOWN; |
1da177e4 | 258 | |
40f98e1a | 259 | if (__find_vlan_dev(real_dev, vlan_id) != NULL) |
c1d3ee99 | 260 | return -EEXIST; |
1da177e4 | 261 | |
c1d3ee99 PM |
262 | return 0; |
263 | } | |
264 | ||
07b5b17e | 265 | int register_vlan_dev(struct net_device *dev) |
e89fe42c PM |
266 | { |
267 | struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); | |
268 | struct net_device *real_dev = vlan->real_dev; | |
269 | unsigned short vlan_id = vlan->vlan_id; | |
270 | struct vlan_group *grp, *ngrp = NULL; | |
271 | int err; | |
272 | ||
273 | grp = __vlan_find_group(real_dev->ifindex); | |
274 | if (!grp) { | |
275 | ngrp = grp = vlan_group_alloc(real_dev->ifindex); | |
276 | if (!grp) | |
277 | return -ENOBUFS; | |
278 | } | |
279 | ||
280 | err = register_netdevice(dev); | |
281 | if (err < 0) | |
282 | goto out_free_group; | |
283 | ||
284 | /* Account for reference in struct vlan_dev_info */ | |
285 | dev_hold(real_dev); | |
286 | ||
287 | vlan_transfer_operstate(real_dev, dev); | |
288 | linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ | |
289 | ||
290 | /* So, got the sucker initialized, now lets place | |
291 | * it into our local structure. | |
292 | */ | |
293 | vlan_group_set_device(grp, vlan_id, dev); | |
294 | if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX) | |
295 | real_dev->vlan_rx_register(real_dev, ngrp); | |
296 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) | |
297 | real_dev->vlan_rx_add_vid(real_dev, vlan_id); | |
298 | ||
299 | if (vlan_proc_add_dev(dev) < 0) | |
40f98e1a PM |
300 | pr_warning("8021q: failed to add proc entry for %s\n", |
301 | dev->name); | |
e89fe42c PM |
302 | return 0; |
303 | ||
304 | out_free_group: | |
305 | if (ngrp) | |
306 | vlan_group_free(ngrp); | |
307 | return err; | |
308 | } | |
309 | ||
c1d3ee99 | 310 | /* Attach a VLAN device to a mac address (ie Ethernet Card). |
2ae0bf69 | 311 | * Returns 0 if the device was created or a negative error code otherwise. |
c1d3ee99 | 312 | */ |
2ae0bf69 PM |
313 | static int register_vlan_device(struct net_device *real_dev, |
314 | unsigned short VLAN_ID) | |
c1d3ee99 | 315 | { |
c1d3ee99 PM |
316 | struct net_device *new_dev; |
317 | char name[IFNAMSIZ]; | |
2ae0bf69 | 318 | int err; |
c1d3ee99 | 319 | |
c1d3ee99 | 320 | if (VLAN_ID >= VLAN_VID_MASK) |
2ae0bf69 | 321 | return -ERANGE; |
c1d3ee99 | 322 | |
2ae0bf69 PM |
323 | err = vlan_check_real_dev(real_dev, VLAN_ID); |
324 | if (err < 0) | |
325 | return err; | |
c1d3ee99 | 326 | |
1da177e4 | 327 | /* Gotta set up the fields for the device. */ |
1da177e4 LT |
328 | switch (vlan_name_type) { |
329 | case VLAN_NAME_TYPE_RAW_PLUS_VID: | |
330 | /* name will look like: eth1.0005 */ | |
331 | snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID); | |
332 | break; | |
333 | case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: | |
334 | /* Put our vlan.VID in the name. | |
335 | * Name will look like: vlan5 | |
336 | */ | |
337 | snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID); | |
338 | break; | |
339 | case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: | |
340 | /* Put our vlan.VID in the name. | |
341 | * Name will look like: eth0.5 | |
342 | */ | |
343 | snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID); | |
344 | break; | |
345 | case VLAN_NAME_TYPE_PLUS_VID: | |
346 | /* Put our vlan.VID in the name. | |
347 | * Name will look like: vlan0005 | |
348 | */ | |
349 | default: | |
350 | snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID); | |
3ff50b79 | 351 | } |
122952fc | 352 | |
1da177e4 LT |
353 | new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, |
354 | vlan_setup); | |
5dd8d1e9 | 355 | |
1da177e4 | 356 | if (new_dev == NULL) |
2ae0bf69 | 357 | return -ENOBUFS; |
1da177e4 | 358 | |
1da177e4 LT |
359 | /* need 4 bytes for extra VLAN header info, |
360 | * hope the underlying device can handle it. | |
361 | */ | |
362 | new_dev->mtu = real_dev->mtu; | |
363 | ||
1da177e4 LT |
364 | VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */ |
365 | VLAN_DEV_INFO(new_dev)->real_dev = real_dev; | |
366 | VLAN_DEV_INFO(new_dev)->dent = NULL; | |
a4bf3af4 | 367 | VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR; |
1da177e4 | 368 | |
07b5b17e | 369 | new_dev->rtnl_link_ops = &vlan_link_ops; |
2ae0bf69 PM |
370 | err = register_vlan_dev(new_dev); |
371 | if (err < 0) | |
e89fe42c | 372 | goto out_free_newdev; |
1da177e4 | 373 | |
2ae0bf69 | 374 | return 0; |
1da177e4 | 375 | |
1da177e4 LT |
376 | out_free_newdev: |
377 | free_netdev(new_dev); | |
2ae0bf69 | 378 | return err; |
1da177e4 LT |
379 | } |
380 | ||
8c979c26 PM |
381 | static void vlan_sync_address(struct net_device *dev, |
382 | struct net_device *vlandev) | |
383 | { | |
384 | struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev); | |
385 | ||
386 | /* May be called without an actual change */ | |
387 | if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr)) | |
388 | return; | |
389 | ||
390 | /* vlan address was different from the old address and is equal to | |
391 | * the new address */ | |
392 | if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
393 | !compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
394 | dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN); | |
395 | ||
396 | /* vlan address was equal to the old address and is different from | |
397 | * the new address */ | |
398 | if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
399 | compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
400 | dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN); | |
401 | ||
402 | memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); | |
403 | } | |
404 | ||
1da177e4 LT |
405 | static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr) |
406 | { | |
407 | struct net_device *dev = ptr; | |
408 | struct vlan_group *grp = __vlan_find_group(dev->ifindex); | |
409 | int i, flgs; | |
410 | struct net_device *vlandev; | |
411 | ||
e9dc8653 EB |
412 | if (dev->nd_net != &init_net) |
413 | return NOTIFY_DONE; | |
414 | ||
1da177e4 LT |
415 | if (!grp) |
416 | goto out; | |
417 | ||
418 | /* It is OK that we do not hold the group lock right now, | |
419 | * as we run under the RTNL lock. | |
420 | */ | |
421 | ||
422 | switch (event) { | |
423 | case NETDEV_CHANGE: | |
424 | /* Propagate real device state to vlan devices */ | |
1da177e4 | 425 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { |
5c15bdec | 426 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
427 | if (!vlandev) |
428 | continue; | |
429 | ||
ddd7bf9f | 430 | vlan_transfer_operstate(dev, vlandev); |
1da177e4 LT |
431 | } |
432 | break; | |
433 | ||
8c979c26 PM |
434 | case NETDEV_CHANGEADDR: |
435 | /* Adjust unicast filters on underlying device */ | |
436 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
437 | vlandev = vlan_group_get_device(grp, i); | |
438 | if (!vlandev) | |
439 | continue; | |
440 | ||
d932e04a PM |
441 | flgs = vlandev->flags; |
442 | if (!(flgs & IFF_UP)) | |
443 | continue; | |
444 | ||
8c979c26 PM |
445 | vlan_sync_address(dev, vlandev); |
446 | } | |
447 | break; | |
448 | ||
1da177e4 LT |
449 | case NETDEV_DOWN: |
450 | /* Put all VLANs for this dev in the down state too. */ | |
451 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 452 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
453 | if (!vlandev) |
454 | continue; | |
455 | ||
456 | flgs = vlandev->flags; | |
457 | if (!(flgs & IFF_UP)) | |
458 | continue; | |
459 | ||
460 | dev_change_flags(vlandev, flgs & ~IFF_UP); | |
461 | } | |
462 | break; | |
463 | ||
464 | case NETDEV_UP: | |
465 | /* Put all VLANs for this dev in the up state too. */ | |
466 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 467 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
468 | if (!vlandev) |
469 | continue; | |
122952fc | 470 | |
1da177e4 LT |
471 | flgs = vlandev->flags; |
472 | if (flgs & IFF_UP) | |
473 | continue; | |
474 | ||
475 | dev_change_flags(vlandev, flgs | IFF_UP); | |
476 | } | |
477 | break; | |
122952fc | 478 | |
1da177e4 LT |
479 | case NETDEV_UNREGISTER: |
480 | /* Delete all VLANs for this dev. */ | |
481 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
482 | int ret; | |
483 | ||
5c15bdec | 484 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
485 | if (!vlandev) |
486 | continue; | |
487 | ||
488 | ret = unregister_vlan_dev(dev, | |
489 | VLAN_DEV_INFO(vlandev)->vlan_id); | |
490 | ||
491 | unregister_netdevice(vlandev); | |
492 | ||
493 | /* Group was destroyed? */ | |
494 | if (ret == 1) | |
495 | break; | |
496 | } | |
497 | break; | |
3ff50b79 | 498 | } |
1da177e4 LT |
499 | |
500 | out: | |
501 | return NOTIFY_DONE; | |
502 | } | |
503 | ||
69ab4b7d PM |
504 | static struct notifier_block vlan_notifier_block __read_mostly = { |
505 | .notifier_call = vlan_device_event, | |
506 | }; | |
507 | ||
1da177e4 LT |
508 | /* |
509 | * VLAN IOCTL handler. | |
510 | * o execute requested action or pass command to the device driver | |
511 | * arg is really a struct vlan_ioctl_args __user *. | |
512 | */ | |
881d966b | 513 | static int vlan_ioctl_handler(struct net *net, void __user *arg) |
1da177e4 | 514 | { |
c17d8874 | 515 | int err; |
1da177e4 LT |
516 | unsigned short vid = 0; |
517 | struct vlan_ioctl_args args; | |
c17d8874 | 518 | struct net_device *dev = NULL; |
1da177e4 LT |
519 | |
520 | if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) | |
521 | return -EFAULT; | |
522 | ||
523 | /* Null terminate this sucker, just in case. */ | |
524 | args.device1[23] = 0; | |
525 | args.u.device2[23] = 0; | |
526 | ||
c17d8874 PM |
527 | rtnl_lock(); |
528 | ||
1da177e4 LT |
529 | switch (args.cmd) { |
530 | case SET_VLAN_INGRESS_PRIORITY_CMD: | |
c17d8874 PM |
531 | case SET_VLAN_EGRESS_PRIORITY_CMD: |
532 | case SET_VLAN_FLAG_CMD: | |
533 | case ADD_VLAN_CMD: | |
534 | case DEL_VLAN_CMD: | |
535 | case GET_VLAN_REALDEV_NAME_CMD: | |
536 | case GET_VLAN_VID_CMD: | |
537 | err = -ENODEV; | |
881d966b | 538 | dev = __dev_get_by_name(&init_net, args.device1); |
c17d8874 PM |
539 | if (!dev) |
540 | goto out; | |
541 | ||
542 | err = -EINVAL; | |
543 | if (args.cmd != ADD_VLAN_CMD && | |
544 | !(dev->priv_flags & IFF_802_1Q_VLAN)) | |
545 | goto out; | |
546 | } | |
547 | ||
548 | switch (args.cmd) { | |
549 | case SET_VLAN_INGRESS_PRIORITY_CMD: | |
550 | err = -EPERM; | |
1da177e4 | 551 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
552 | break; |
553 | vlan_dev_set_ingress_priority(dev, | |
554 | args.u.skb_priority, | |
555 | args.vlan_qos); | |
fffe470a | 556 | err = 0; |
1da177e4 LT |
557 | break; |
558 | ||
559 | case SET_VLAN_EGRESS_PRIORITY_CMD: | |
c17d8874 | 560 | err = -EPERM; |
1da177e4 | 561 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
562 | break; |
563 | err = vlan_dev_set_egress_priority(dev, | |
1da177e4 LT |
564 | args.u.skb_priority, |
565 | args.vlan_qos); | |
566 | break; | |
567 | ||
568 | case SET_VLAN_FLAG_CMD: | |
c17d8874 | 569 | err = -EPERM; |
1da177e4 | 570 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
571 | break; |
572 | err = vlan_dev_set_vlan_flag(dev, | |
1da177e4 LT |
573 | args.u.flag, |
574 | args.vlan_qos); | |
575 | break; | |
576 | ||
577 | case SET_VLAN_NAME_TYPE_CMD: | |
c17d8874 | 578 | err = -EPERM; |
1da177e4 | 579 | if (!capable(CAP_NET_ADMIN)) |
e35de026 | 580 | break; |
c17d8874 PM |
581 | if ((args.u.name_type >= 0) && |
582 | (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { | |
1da177e4 LT |
583 | vlan_name_type = args.u.name_type; |
584 | err = 0; | |
585 | } else { | |
586 | err = -EINVAL; | |
587 | } | |
588 | break; | |
589 | ||
590 | case ADD_VLAN_CMD: | |
c17d8874 | 591 | err = -EPERM; |
1da177e4 | 592 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 | 593 | break; |
2ae0bf69 | 594 | err = register_vlan_device(dev, args.u.VID); |
1da177e4 LT |
595 | break; |
596 | ||
597 | case DEL_VLAN_CMD: | |
c17d8874 | 598 | err = -EPERM; |
1da177e4 | 599 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
600 | break; |
601 | err = unregister_vlan_device(dev); | |
1da177e4 LT |
602 | break; |
603 | ||
1da177e4 | 604 | case GET_VLAN_REALDEV_NAME_CMD: |
3f5f4346 | 605 | err = 0; |
c17d8874 | 606 | vlan_dev_get_realdev_name(dev, args.u.device2); |
1da177e4 LT |
607 | if (copy_to_user(arg, &args, |
608 | sizeof(struct vlan_ioctl_args))) { | |
609 | err = -EFAULT; | |
610 | } | |
611 | break; | |
612 | ||
613 | case GET_VLAN_VID_CMD: | |
3f5f4346 | 614 | err = 0; |
c17d8874 | 615 | vlan_dev_get_vid(dev, &vid); |
1da177e4 LT |
616 | args.u.VID = vid; |
617 | if (copy_to_user(arg, &args, | |
618 | sizeof(struct vlan_ioctl_args))) { | |
122952fc | 619 | err = -EFAULT; |
1da177e4 LT |
620 | } |
621 | break; | |
622 | ||
623 | default: | |
198a291c | 624 | err = -EOPNOTSUPP; |
c17d8874 | 625 | break; |
3ff50b79 | 626 | } |
7eb1b3d3 | 627 | out: |
c17d8874 | 628 | rtnl_unlock(); |
1da177e4 LT |
629 | return err; |
630 | } | |
631 | ||
69ab4b7d PM |
632 | static int __init vlan_proto_init(void) |
633 | { | |
634 | int err; | |
635 | ||
636 | pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); | |
637 | pr_info("All bugs added by %s\n", vlan_buggyright); | |
638 | ||
639 | err = vlan_proc_init(); | |
640 | if (err < 0) | |
641 | goto err1; | |
642 | ||
643 | err = register_netdevice_notifier(&vlan_notifier_block); | |
644 | if (err < 0) | |
645 | goto err2; | |
646 | ||
647 | err = vlan_netlink_init(); | |
648 | if (err < 0) | |
649 | goto err3; | |
650 | ||
651 | dev_add_pack(&vlan_packet_type); | |
652 | vlan_ioctl_set(vlan_ioctl_handler); | |
653 | return 0; | |
654 | ||
655 | err3: | |
656 | unregister_netdevice_notifier(&vlan_notifier_block); | |
657 | err2: | |
658 | vlan_proc_cleanup(); | |
659 | err1: | |
660 | return err; | |
661 | } | |
662 | ||
663 | static void __exit vlan_cleanup_module(void) | |
664 | { | |
665 | unsigned int i; | |
666 | ||
667 | vlan_ioctl_set(NULL); | |
668 | vlan_netlink_fini(); | |
669 | ||
670 | unregister_netdevice_notifier(&vlan_notifier_block); | |
671 | ||
672 | dev_remove_pack(&vlan_packet_type); | |
673 | ||
674 | /* This table must be empty if there are no module references left. */ | |
675 | for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) | |
676 | BUG_ON(!hlist_empty(&vlan_group_hash[i])); | |
677 | ||
678 | vlan_proc_cleanup(); | |
679 | ||
680 | synchronize_net(); | |
681 | } | |
682 | ||
683 | module_init(vlan_proto_init); | |
684 | module_exit(vlan_cleanup_module); | |
685 | ||
1da177e4 LT |
686 | MODULE_LICENSE("GPL"); |
687 | MODULE_VERSION(DRV_VERSION); |