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> | |
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 | { | |
145 | struct net_device *dev = NULL; | |
146 | int real_dev_ifindex = real_dev->ifindex; | |
147 | struct vlan_group *grp; | |
148 | int i, ret; | |
149 | ||
1da177e4 LT |
150 | /* sanity check */ |
151 | if (vlan_id >= VLAN_VID_MASK) | |
152 | return -EINVAL; | |
153 | ||
154 | ASSERT_RTNL(); | |
155 | grp = __vlan_find_group(real_dev_ifindex); | |
156 | ||
157 | ret = 0; | |
158 | ||
159 | if (grp) { | |
5c15bdec | 160 | dev = vlan_group_get_device(grp, vlan_id); |
1da177e4 LT |
161 | if (dev) { |
162 | /* Remove proc entry */ | |
163 | vlan_proc_rem_dev(dev); | |
164 | ||
165 | /* Take it out of our own structures, but be sure to | |
166 | * interlock with HW accelerating devices or SW vlan | |
167 | * input packet processing. | |
168 | */ | |
d2d1acdb | 169 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) |
1da177e4 | 170 | real_dev->vlan_rx_kill_vid(real_dev, vlan_id); |
1da177e4 | 171 | |
5c15bdec | 172 | vlan_group_set_device(grp, vlan_id, NULL); |
1da177e4 LT |
173 | synchronize_net(); |
174 | ||
175 | ||
176 | /* Caller unregisters (and if necessary, puts) | |
177 | * VLAN device, but we get rid of the reference to | |
178 | * real_dev here. | |
179 | */ | |
180 | dev_put(real_dev); | |
181 | ||
182 | /* If the group is now empty, kill off the | |
183 | * group. | |
184 | */ | |
185 | for (i = 0; i < VLAN_VID_MASK; i++) | |
5c15bdec | 186 | if (vlan_group_get_device(grp, i)) |
1da177e4 LT |
187 | break; |
188 | ||
189 | if (i == VLAN_VID_MASK) { | |
190 | if (real_dev->features & NETIF_F_HW_VLAN_RX) | |
191 | real_dev->vlan_rx_register(real_dev, NULL); | |
192 | ||
193 | hlist_del_rcu(&grp->hlist); | |
194 | ||
195 | /* Free the group, after all cpu's are done. */ | |
196 | call_rcu(&grp->rcu, vlan_rcu_free); | |
197 | ||
198 | grp = NULL; | |
199 | ret = 1; | |
200 | } | |
201 | } | |
202 | } | |
203 | ||
122952fc | 204 | return ret; |
1da177e4 LT |
205 | } |
206 | ||
07b5b17e | 207 | int unregister_vlan_device(struct net_device *dev) |
1da177e4 | 208 | { |
1da177e4 LT |
209 | int ret; |
210 | ||
c17d8874 PM |
211 | ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev, |
212 | VLAN_DEV_INFO(dev)->vlan_id); | |
213 | unregister_netdevice(dev); | |
1da177e4 | 214 | |
c17d8874 PM |
215 | if (ret == 1) |
216 | ret = 0; | |
1da177e4 LT |
217 | return ret; |
218 | } | |
219 | ||
ddd7bf9f SR |
220 | static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev) |
221 | { | |
222 | /* Have to respect userspace enforced dormant state | |
223 | * of real device, also must allow supplicant running | |
224 | * on VLAN device | |
225 | */ | |
226 | if (dev->operstate == IF_OPER_DORMANT) | |
227 | netif_dormant_on(vlandev); | |
228 | else | |
229 | netif_dormant_off(vlandev); | |
230 | ||
231 | if (netif_carrier_ok(dev)) { | |
232 | if (!netif_carrier_ok(vlandev)) | |
233 | netif_carrier_on(vlandev); | |
234 | } else { | |
235 | if (netif_carrier_ok(vlandev)) | |
236 | netif_carrier_off(vlandev); | |
237 | } | |
238 | } | |
239 | ||
07b5b17e | 240 | int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id) |
1da177e4 | 241 | { |
40f98e1a PM |
242 | char *name = real_dev->name; |
243 | ||
1da177e4 | 244 | if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { |
40f98e1a | 245 | pr_info("8021q: VLANs not supported on %s\n", name); |
c1d3ee99 | 246 | return -EOPNOTSUPP; |
1da177e4 LT |
247 | } |
248 | ||
249 | if ((real_dev->features & NETIF_F_HW_VLAN_RX) && | |
d2d1acdb | 250 | !real_dev->vlan_rx_register) { |
40f98e1a | 251 | pr_info("8021q: device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 252 | return -EOPNOTSUPP; |
1da177e4 LT |
253 | } |
254 | ||
255 | if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) && | |
d2d1acdb | 256 | (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) { |
40f98e1a | 257 | pr_info("8021q: Device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 258 | return -EOPNOTSUPP; |
1da177e4 LT |
259 | } |
260 | ||
1da177e4 LT |
261 | /* The real device must be up and operating in order to |
262 | * assosciate a VLAN device with it. | |
263 | */ | |
264 | if (!(real_dev->flags & IFF_UP)) | |
c1d3ee99 | 265 | return -ENETDOWN; |
1da177e4 | 266 | |
40f98e1a | 267 | if (__find_vlan_dev(real_dev, vlan_id) != NULL) |
c1d3ee99 | 268 | return -EEXIST; |
1da177e4 | 269 | |
c1d3ee99 PM |
270 | return 0; |
271 | } | |
272 | ||
07b5b17e | 273 | int register_vlan_dev(struct net_device *dev) |
e89fe42c PM |
274 | { |
275 | struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); | |
276 | struct net_device *real_dev = vlan->real_dev; | |
277 | unsigned short vlan_id = vlan->vlan_id; | |
278 | struct vlan_group *grp, *ngrp = NULL; | |
279 | int err; | |
280 | ||
281 | grp = __vlan_find_group(real_dev->ifindex); | |
282 | if (!grp) { | |
283 | ngrp = grp = vlan_group_alloc(real_dev->ifindex); | |
284 | if (!grp) | |
285 | return -ENOBUFS; | |
286 | } | |
287 | ||
288 | err = register_netdevice(dev); | |
289 | if (err < 0) | |
290 | goto out_free_group; | |
291 | ||
292 | /* Account for reference in struct vlan_dev_info */ | |
293 | dev_hold(real_dev); | |
294 | ||
295 | vlan_transfer_operstate(real_dev, dev); | |
296 | linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ | |
297 | ||
298 | /* So, got the sucker initialized, now lets place | |
299 | * it into our local structure. | |
300 | */ | |
301 | vlan_group_set_device(grp, vlan_id, dev); | |
302 | if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX) | |
303 | real_dev->vlan_rx_register(real_dev, ngrp); | |
304 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) | |
305 | real_dev->vlan_rx_add_vid(real_dev, vlan_id); | |
306 | ||
307 | if (vlan_proc_add_dev(dev) < 0) | |
40f98e1a PM |
308 | pr_warning("8021q: failed to add proc entry for %s\n", |
309 | dev->name); | |
e89fe42c PM |
310 | return 0; |
311 | ||
312 | out_free_group: | |
313 | if (ngrp) | |
314 | vlan_group_free(ngrp); | |
315 | return err; | |
316 | } | |
317 | ||
c1d3ee99 | 318 | /* Attach a VLAN device to a mac address (ie Ethernet Card). |
2ae0bf69 | 319 | * Returns 0 if the device was created or a negative error code otherwise. |
c1d3ee99 | 320 | */ |
2ae0bf69 PM |
321 | static int register_vlan_device(struct net_device *real_dev, |
322 | unsigned short VLAN_ID) | |
c1d3ee99 | 323 | { |
c1d3ee99 PM |
324 | struct net_device *new_dev; |
325 | char name[IFNAMSIZ]; | |
2ae0bf69 | 326 | int err; |
c1d3ee99 | 327 | |
c1d3ee99 | 328 | if (VLAN_ID >= VLAN_VID_MASK) |
2ae0bf69 | 329 | return -ERANGE; |
c1d3ee99 | 330 | |
2ae0bf69 PM |
331 | err = vlan_check_real_dev(real_dev, VLAN_ID); |
332 | if (err < 0) | |
333 | return err; | |
c1d3ee99 | 334 | |
1da177e4 | 335 | /* Gotta set up the fields for the device. */ |
1da177e4 LT |
336 | switch (vlan_name_type) { |
337 | case VLAN_NAME_TYPE_RAW_PLUS_VID: | |
338 | /* name will look like: eth1.0005 */ | |
339 | snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID); | |
340 | break; | |
341 | case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: | |
342 | /* Put our vlan.VID in the name. | |
343 | * Name will look like: vlan5 | |
344 | */ | |
345 | snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID); | |
346 | break; | |
347 | case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: | |
348 | /* Put our vlan.VID in the name. | |
349 | * Name will look like: eth0.5 | |
350 | */ | |
351 | snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID); | |
352 | break; | |
353 | case VLAN_NAME_TYPE_PLUS_VID: | |
354 | /* Put our vlan.VID in the name. | |
355 | * Name will look like: vlan0005 | |
356 | */ | |
357 | default: | |
358 | snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID); | |
3ff50b79 | 359 | } |
122952fc | 360 | |
1da177e4 LT |
361 | new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, |
362 | vlan_setup); | |
5dd8d1e9 | 363 | |
1da177e4 | 364 | if (new_dev == NULL) |
2ae0bf69 | 365 | return -ENOBUFS; |
1da177e4 | 366 | |
1da177e4 LT |
367 | /* need 4 bytes for extra VLAN header info, |
368 | * hope the underlying device can handle it. | |
369 | */ | |
370 | new_dev->mtu = real_dev->mtu; | |
371 | ||
1da177e4 LT |
372 | VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */ |
373 | VLAN_DEV_INFO(new_dev)->real_dev = real_dev; | |
374 | VLAN_DEV_INFO(new_dev)->dent = NULL; | |
a4bf3af4 | 375 | VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR; |
1da177e4 | 376 | |
07b5b17e | 377 | new_dev->rtnl_link_ops = &vlan_link_ops; |
2ae0bf69 PM |
378 | err = register_vlan_dev(new_dev); |
379 | if (err < 0) | |
e89fe42c | 380 | goto out_free_newdev; |
1da177e4 | 381 | |
2ae0bf69 | 382 | return 0; |
1da177e4 | 383 | |
1da177e4 LT |
384 | out_free_newdev: |
385 | free_netdev(new_dev); | |
2ae0bf69 | 386 | return err; |
1da177e4 LT |
387 | } |
388 | ||
8c979c26 PM |
389 | static void vlan_sync_address(struct net_device *dev, |
390 | struct net_device *vlandev) | |
391 | { | |
392 | struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev); | |
393 | ||
394 | /* May be called without an actual change */ | |
395 | if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr)) | |
396 | return; | |
397 | ||
398 | /* vlan address was different from the old address and is equal to | |
399 | * the new address */ | |
400 | if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
401 | !compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
402 | dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN); | |
403 | ||
404 | /* vlan address was equal to the old address and is different from | |
405 | * the new address */ | |
406 | if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
407 | compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
408 | dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN); | |
409 | ||
410 | memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); | |
411 | } | |
412 | ||
1da177e4 LT |
413 | static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr) |
414 | { | |
415 | struct net_device *dev = ptr; | |
416 | struct vlan_group *grp = __vlan_find_group(dev->ifindex); | |
417 | int i, flgs; | |
418 | struct net_device *vlandev; | |
419 | ||
e9dc8653 EB |
420 | if (dev->nd_net != &init_net) |
421 | return NOTIFY_DONE; | |
422 | ||
1da177e4 LT |
423 | if (!grp) |
424 | goto out; | |
425 | ||
426 | /* It is OK that we do not hold the group lock right now, | |
427 | * as we run under the RTNL lock. | |
428 | */ | |
429 | ||
430 | switch (event) { | |
431 | case NETDEV_CHANGE: | |
432 | /* Propagate real device state to vlan devices */ | |
1da177e4 | 433 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { |
5c15bdec | 434 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
435 | if (!vlandev) |
436 | continue; | |
437 | ||
ddd7bf9f | 438 | vlan_transfer_operstate(dev, vlandev); |
1da177e4 LT |
439 | } |
440 | break; | |
441 | ||
8c979c26 PM |
442 | case NETDEV_CHANGEADDR: |
443 | /* Adjust unicast filters on underlying device */ | |
444 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
445 | vlandev = vlan_group_get_device(grp, i); | |
446 | if (!vlandev) | |
447 | continue; | |
448 | ||
d932e04a PM |
449 | flgs = vlandev->flags; |
450 | if (!(flgs & IFF_UP)) | |
451 | continue; | |
452 | ||
8c979c26 PM |
453 | vlan_sync_address(dev, vlandev); |
454 | } | |
455 | break; | |
456 | ||
1da177e4 LT |
457 | case NETDEV_DOWN: |
458 | /* Put all VLANs for this dev in the down state too. */ | |
459 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 460 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
461 | if (!vlandev) |
462 | continue; | |
463 | ||
464 | flgs = vlandev->flags; | |
465 | if (!(flgs & IFF_UP)) | |
466 | continue; | |
467 | ||
468 | dev_change_flags(vlandev, flgs & ~IFF_UP); | |
469 | } | |
470 | break; | |
471 | ||
472 | case NETDEV_UP: | |
473 | /* Put all VLANs for this dev in the up state too. */ | |
474 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 475 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
476 | if (!vlandev) |
477 | continue; | |
122952fc | 478 | |
1da177e4 LT |
479 | flgs = vlandev->flags; |
480 | if (flgs & IFF_UP) | |
481 | continue; | |
482 | ||
483 | dev_change_flags(vlandev, flgs | IFF_UP); | |
484 | } | |
485 | break; | |
122952fc | 486 | |
1da177e4 LT |
487 | case NETDEV_UNREGISTER: |
488 | /* Delete all VLANs for this dev. */ | |
489 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
490 | int ret; | |
491 | ||
5c15bdec | 492 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
493 | if (!vlandev) |
494 | continue; | |
495 | ||
496 | ret = unregister_vlan_dev(dev, | |
497 | VLAN_DEV_INFO(vlandev)->vlan_id); | |
498 | ||
499 | unregister_netdevice(vlandev); | |
500 | ||
501 | /* Group was destroyed? */ | |
502 | if (ret == 1) | |
503 | break; | |
504 | } | |
505 | break; | |
3ff50b79 | 506 | } |
1da177e4 LT |
507 | |
508 | out: | |
509 | return NOTIFY_DONE; | |
510 | } | |
511 | ||
69ab4b7d PM |
512 | static struct notifier_block vlan_notifier_block __read_mostly = { |
513 | .notifier_call = vlan_device_event, | |
514 | }; | |
515 | ||
1da177e4 LT |
516 | /* |
517 | * VLAN IOCTL handler. | |
518 | * o execute requested action or pass command to the device driver | |
519 | * arg is really a struct vlan_ioctl_args __user *. | |
520 | */ | |
881d966b | 521 | static int vlan_ioctl_handler(struct net *net, void __user *arg) |
1da177e4 | 522 | { |
c17d8874 | 523 | int err; |
1da177e4 LT |
524 | unsigned short vid = 0; |
525 | struct vlan_ioctl_args args; | |
c17d8874 | 526 | struct net_device *dev = NULL; |
1da177e4 LT |
527 | |
528 | if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) | |
529 | return -EFAULT; | |
530 | ||
531 | /* Null terminate this sucker, just in case. */ | |
532 | args.device1[23] = 0; | |
533 | args.u.device2[23] = 0; | |
534 | ||
c17d8874 PM |
535 | rtnl_lock(); |
536 | ||
1da177e4 LT |
537 | switch (args.cmd) { |
538 | case SET_VLAN_INGRESS_PRIORITY_CMD: | |
c17d8874 PM |
539 | case SET_VLAN_EGRESS_PRIORITY_CMD: |
540 | case SET_VLAN_FLAG_CMD: | |
541 | case ADD_VLAN_CMD: | |
542 | case DEL_VLAN_CMD: | |
543 | case GET_VLAN_REALDEV_NAME_CMD: | |
544 | case GET_VLAN_VID_CMD: | |
545 | err = -ENODEV; | |
881d966b | 546 | dev = __dev_get_by_name(&init_net, args.device1); |
c17d8874 PM |
547 | if (!dev) |
548 | goto out; | |
549 | ||
550 | err = -EINVAL; | |
551 | if (args.cmd != ADD_VLAN_CMD && | |
552 | !(dev->priv_flags & IFF_802_1Q_VLAN)) | |
553 | goto out; | |
554 | } | |
555 | ||
556 | switch (args.cmd) { | |
557 | case SET_VLAN_INGRESS_PRIORITY_CMD: | |
558 | err = -EPERM; | |
1da177e4 | 559 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
560 | break; |
561 | vlan_dev_set_ingress_priority(dev, | |
562 | args.u.skb_priority, | |
563 | args.vlan_qos); | |
fffe470a | 564 | err = 0; |
1da177e4 LT |
565 | break; |
566 | ||
567 | case SET_VLAN_EGRESS_PRIORITY_CMD: | |
c17d8874 | 568 | err = -EPERM; |
1da177e4 | 569 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
570 | break; |
571 | err = vlan_dev_set_egress_priority(dev, | |
1da177e4 LT |
572 | args.u.skb_priority, |
573 | args.vlan_qos); | |
574 | break; | |
575 | ||
576 | case SET_VLAN_FLAG_CMD: | |
c17d8874 | 577 | err = -EPERM; |
1da177e4 | 578 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
579 | break; |
580 | err = vlan_dev_set_vlan_flag(dev, | |
1da177e4 LT |
581 | args.u.flag, |
582 | args.vlan_qos); | |
583 | break; | |
584 | ||
585 | case SET_VLAN_NAME_TYPE_CMD: | |
c17d8874 | 586 | err = -EPERM; |
1da177e4 | 587 | if (!capable(CAP_NET_ADMIN)) |
e35de026 | 588 | break; |
c17d8874 PM |
589 | if ((args.u.name_type >= 0) && |
590 | (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { | |
1da177e4 LT |
591 | vlan_name_type = args.u.name_type; |
592 | err = 0; | |
593 | } else { | |
594 | err = -EINVAL; | |
595 | } | |
596 | break; | |
597 | ||
598 | case ADD_VLAN_CMD: | |
c17d8874 | 599 | err = -EPERM; |
1da177e4 | 600 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 | 601 | break; |
2ae0bf69 | 602 | err = register_vlan_device(dev, args.u.VID); |
1da177e4 LT |
603 | break; |
604 | ||
605 | case DEL_VLAN_CMD: | |
c17d8874 | 606 | err = -EPERM; |
1da177e4 | 607 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
608 | break; |
609 | err = unregister_vlan_device(dev); | |
1da177e4 LT |
610 | break; |
611 | ||
1da177e4 | 612 | case GET_VLAN_REALDEV_NAME_CMD: |
3f5f4346 | 613 | err = 0; |
c17d8874 | 614 | vlan_dev_get_realdev_name(dev, args.u.device2); |
1da177e4 LT |
615 | if (copy_to_user(arg, &args, |
616 | sizeof(struct vlan_ioctl_args))) { | |
617 | err = -EFAULT; | |
618 | } | |
619 | break; | |
620 | ||
621 | case GET_VLAN_VID_CMD: | |
3f5f4346 | 622 | err = 0; |
c17d8874 | 623 | vlan_dev_get_vid(dev, &vid); |
1da177e4 LT |
624 | args.u.VID = vid; |
625 | if (copy_to_user(arg, &args, | |
626 | sizeof(struct vlan_ioctl_args))) { | |
122952fc | 627 | err = -EFAULT; |
1da177e4 LT |
628 | } |
629 | break; | |
630 | ||
631 | default: | |
198a291c | 632 | err = -EOPNOTSUPP; |
c17d8874 | 633 | break; |
3ff50b79 | 634 | } |
7eb1b3d3 | 635 | out: |
c17d8874 | 636 | rtnl_unlock(); |
1da177e4 LT |
637 | return err; |
638 | } | |
639 | ||
69ab4b7d PM |
640 | static int __init vlan_proto_init(void) |
641 | { | |
642 | int err; | |
643 | ||
644 | pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); | |
645 | pr_info("All bugs added by %s\n", vlan_buggyright); | |
646 | ||
647 | err = vlan_proc_init(); | |
648 | if (err < 0) | |
649 | goto err1; | |
650 | ||
651 | err = register_netdevice_notifier(&vlan_notifier_block); | |
652 | if (err < 0) | |
653 | goto err2; | |
654 | ||
655 | err = vlan_netlink_init(); | |
656 | if (err < 0) | |
657 | goto err3; | |
658 | ||
659 | dev_add_pack(&vlan_packet_type); | |
660 | vlan_ioctl_set(vlan_ioctl_handler); | |
661 | return 0; | |
662 | ||
663 | err3: | |
664 | unregister_netdevice_notifier(&vlan_notifier_block); | |
665 | err2: | |
666 | vlan_proc_cleanup(); | |
667 | err1: | |
668 | return err; | |
669 | } | |
670 | ||
671 | static void __exit vlan_cleanup_module(void) | |
672 | { | |
673 | unsigned int i; | |
674 | ||
675 | vlan_ioctl_set(NULL); | |
676 | vlan_netlink_fini(); | |
677 | ||
678 | unregister_netdevice_notifier(&vlan_notifier_block); | |
679 | ||
680 | dev_remove_pack(&vlan_packet_type); | |
681 | ||
682 | /* This table must be empty if there are no module references left. */ | |
683 | for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) | |
684 | BUG_ON(!hlist_empty(&vlan_group_hash[i])); | |
685 | ||
686 | vlan_proc_cleanup(); | |
687 | ||
688 | synchronize_net(); | |
689 | } | |
690 | ||
691 | module_init(vlan_proto_init); | |
692 | module_exit(vlan_cleanup_module); | |
693 | ||
1da177e4 LT |
694 | MODULE_LICENSE("GPL"); |
695 | MODULE_VERSION(DRV_VERSION); |