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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> |
d9ed0f0e | 35 | #include <net/netns/generic.h> |
1da177e4 LT |
36 | |
37 | #include <linux/if_vlan.h> | |
38 | #include "vlan.h" | |
39 | #include "vlanproc.h" | |
40 | ||
41 | #define DRV_VERSION "1.8" | |
42 | ||
43 | /* Global VLAN variables */ | |
44 | ||
d9ed0f0e PE |
45 | int vlan_net_id; |
46 | ||
1da177e4 LT |
47 | /* Our listing of VLAN group(s) */ |
48 | static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE]; | |
1da177e4 LT |
49 | |
50 | static char vlan_fullname[] = "802.1Q VLAN Support"; | |
51 | static char vlan_version[] = DRV_VERSION; | |
52 | static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>"; | |
53 | static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>"; | |
54 | ||
1da177e4 LT |
55 | /* Determines interface naming scheme. */ |
56 | unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; | |
57 | ||
58 | static struct packet_type vlan_packet_type = { | |
59 | .type = __constant_htons(ETH_P_8021Q), | |
60 | .func = vlan_skb_recv, /* VLAN receive method */ | |
61 | }; | |
62 | ||
1da177e4 LT |
63 | /* End of global variables definitions. */ |
64 | ||
2029cc2c PM |
65 | static inline unsigned int vlan_grp_hashfn(unsigned int idx) |
66 | { | |
67 | return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK; | |
68 | } | |
69 | ||
1da177e4 | 70 | /* Must be invoked with RCU read lock (no preempt) */ |
a9fde260 | 71 | static struct vlan_group *__vlan_find_group(struct net_device *real_dev) |
1da177e4 LT |
72 | { |
73 | struct vlan_group *grp; | |
74 | struct hlist_node *n; | |
a9fde260 | 75 | int hash = vlan_grp_hashfn(real_dev->ifindex); |
1da177e4 LT |
76 | |
77 | hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) { | |
a9fde260 | 78 | if (grp->real_dev == real_dev) |
1da177e4 LT |
79 | return grp; |
80 | } | |
81 | ||
82 | return NULL; | |
83 | } | |
84 | ||
85 | /* Find the protocol handler. Assumes VID < VLAN_VID_MASK. | |
86 | * | |
87 | * Must be invoked with RCU read lock (no preempt) | |
88 | */ | |
89 | struct net_device *__find_vlan_dev(struct net_device *real_dev, | |
90 | unsigned short VID) | |
91 | { | |
a9fde260 | 92 | struct vlan_group *grp = __vlan_find_group(real_dev); |
1da177e4 LT |
93 | |
94 | if (grp) | |
5c15bdec | 95 | return vlan_group_get_device(grp, VID); |
1da177e4 LT |
96 | |
97 | return NULL; | |
98 | } | |
99 | ||
5c15bdec DA |
100 | static void vlan_group_free(struct vlan_group *grp) |
101 | { | |
102 | int i; | |
103 | ||
2029cc2c | 104 | for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) |
5c15bdec DA |
105 | kfree(grp->vlan_devices_arrays[i]); |
106 | kfree(grp); | |
107 | } | |
108 | ||
a9fde260 | 109 | static struct vlan_group *vlan_group_alloc(struct net_device *real_dev) |
42429aae PM |
110 | { |
111 | struct vlan_group *grp; | |
42429aae PM |
112 | |
113 | grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL); | |
114 | if (!grp) | |
115 | return NULL; | |
116 | ||
a9fde260 | 117 | grp->real_dev = real_dev; |
42429aae | 118 | hlist_add_head_rcu(&grp->hlist, |
a9fde260 | 119 | &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]); |
42429aae | 120 | return grp; |
67727184 | 121 | } |
42429aae | 122 | |
67727184 PE |
123 | static int vlan_group_prealloc_vid(struct vlan_group *vg, int vid) |
124 | { | |
125 | struct net_device **array; | |
126 | unsigned int size; | |
127 | ||
128 | ASSERT_RTNL(); | |
129 | ||
130 | array = vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN]; | |
131 | if (array != NULL) | |
132 | return 0; | |
133 | ||
134 | size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN; | |
135 | array = kzalloc(size, GFP_KERNEL); | |
136 | if (array == NULL) | |
137 | return -ENOBUFS; | |
138 | ||
139 | vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN] = array; | |
140 | return 0; | |
42429aae PM |
141 | } |
142 | ||
1da177e4 LT |
143 | static void vlan_rcu_free(struct rcu_head *rcu) |
144 | { | |
5c15bdec | 145 | vlan_group_free(container_of(rcu, struct vlan_group, rcu)); |
1da177e4 LT |
146 | } |
147 | ||
af301517 | 148 | void unregister_vlan_dev(struct net_device *dev) |
1da177e4 | 149 | { |
9dfebcc6 | 150 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
af301517 | 151 | struct net_device *real_dev = vlan->real_dev; |
1da177e4 | 152 | struct vlan_group *grp; |
af301517 | 153 | unsigned short vlan_id = vlan->vlan_id; |
1da177e4 LT |
154 | |
155 | ASSERT_RTNL(); | |
acc5efbc | 156 | |
a9fde260 | 157 | grp = __vlan_find_group(real_dev); |
af301517 | 158 | BUG_ON(!grp); |
acc5efbc PM |
159 | |
160 | vlan_proc_rem_dev(dev); | |
161 | ||
162 | /* Take it out of our own structures, but be sure to interlock with | |
163 | * HW accelerating devices or SW vlan input packet processing. | |
164 | */ | |
165 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) | |
166 | real_dev->vlan_rx_kill_vid(real_dev, vlan_id); | |
1da177e4 | 167 | |
acc5efbc | 168 | vlan_group_set_device(grp, vlan_id, NULL); |
af301517 | 169 | grp->nr_vlans--; |
acc5efbc | 170 | |
af301517 | 171 | synchronize_net(); |
acc5efbc PM |
172 | |
173 | /* If the group is now empty, kill off the group. */ | |
af301517 | 174 | if (grp->nr_vlans == 0) { |
acc5efbc PM |
175 | if (real_dev->features & NETIF_F_HW_VLAN_RX) |
176 | real_dev->vlan_rx_register(real_dev, NULL); | |
177 | ||
178 | hlist_del_rcu(&grp->hlist); | |
1da177e4 | 179 | |
acc5efbc PM |
180 | /* Free the group, after all cpu's are done. */ |
181 | call_rcu(&grp->rcu, vlan_rcu_free); | |
1da177e4 LT |
182 | } |
183 | ||
af301517 PM |
184 | /* Get rid of the vlan's reference to real_dev */ |
185 | dev_put(real_dev); | |
1da177e4 | 186 | |
c17d8874 | 187 | unregister_netdevice(dev); |
1da177e4 LT |
188 | } |
189 | ||
2029cc2c PM |
190 | static void vlan_transfer_operstate(const struct net_device *dev, |
191 | struct net_device *vlandev) | |
ddd7bf9f SR |
192 | { |
193 | /* Have to respect userspace enforced dormant state | |
194 | * of real device, also must allow supplicant running | |
195 | * on VLAN device | |
196 | */ | |
197 | if (dev->operstate == IF_OPER_DORMANT) | |
198 | netif_dormant_on(vlandev); | |
199 | else | |
200 | netif_dormant_off(vlandev); | |
201 | ||
202 | if (netif_carrier_ok(dev)) { | |
203 | if (!netif_carrier_ok(vlandev)) | |
204 | netif_carrier_on(vlandev); | |
205 | } else { | |
206 | if (netif_carrier_ok(vlandev)) | |
207 | netif_carrier_off(vlandev); | |
208 | } | |
209 | } | |
210 | ||
07b5b17e | 211 | int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id) |
1da177e4 | 212 | { |
40f98e1a PM |
213 | char *name = real_dev->name; |
214 | ||
1da177e4 | 215 | if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { |
40f98e1a | 216 | pr_info("8021q: VLANs not supported on %s\n", name); |
c1d3ee99 | 217 | return -EOPNOTSUPP; |
1da177e4 LT |
218 | } |
219 | ||
220 | if ((real_dev->features & NETIF_F_HW_VLAN_RX) && | |
d2d1acdb | 221 | !real_dev->vlan_rx_register) { |
40f98e1a | 222 | pr_info("8021q: device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 223 | return -EOPNOTSUPP; |
1da177e4 LT |
224 | } |
225 | ||
226 | if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) && | |
d2d1acdb | 227 | (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) { |
40f98e1a | 228 | pr_info("8021q: Device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 229 | return -EOPNOTSUPP; |
1da177e4 LT |
230 | } |
231 | ||
1da177e4 LT |
232 | /* The real device must be up and operating in order to |
233 | * assosciate a VLAN device with it. | |
234 | */ | |
235 | if (!(real_dev->flags & IFF_UP)) | |
c1d3ee99 | 236 | return -ENETDOWN; |
1da177e4 | 237 | |
40f98e1a | 238 | if (__find_vlan_dev(real_dev, vlan_id) != NULL) |
c1d3ee99 | 239 | return -EEXIST; |
1da177e4 | 240 | |
c1d3ee99 PM |
241 | return 0; |
242 | } | |
243 | ||
07b5b17e | 244 | int register_vlan_dev(struct net_device *dev) |
e89fe42c | 245 | { |
9dfebcc6 | 246 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
e89fe42c PM |
247 | struct net_device *real_dev = vlan->real_dev; |
248 | unsigned short vlan_id = vlan->vlan_id; | |
249 | struct vlan_group *grp, *ngrp = NULL; | |
250 | int err; | |
251 | ||
a9fde260 | 252 | grp = __vlan_find_group(real_dev); |
e89fe42c | 253 | if (!grp) { |
a9fde260 | 254 | ngrp = grp = vlan_group_alloc(real_dev); |
e89fe42c PM |
255 | if (!grp) |
256 | return -ENOBUFS; | |
257 | } | |
258 | ||
67727184 PE |
259 | err = vlan_group_prealloc_vid(grp, vlan_id); |
260 | if (err < 0) | |
261 | goto out_free_group; | |
262 | ||
e89fe42c PM |
263 | err = register_netdevice(dev); |
264 | if (err < 0) | |
265 | goto out_free_group; | |
266 | ||
267 | /* Account for reference in struct vlan_dev_info */ | |
268 | dev_hold(real_dev); | |
269 | ||
270 | vlan_transfer_operstate(real_dev, dev); | |
271 | linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ | |
272 | ||
273 | /* So, got the sucker initialized, now lets place | |
274 | * it into our local structure. | |
275 | */ | |
276 | vlan_group_set_device(grp, vlan_id, dev); | |
af301517 PM |
277 | grp->nr_vlans++; |
278 | ||
e89fe42c PM |
279 | if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX) |
280 | real_dev->vlan_rx_register(real_dev, ngrp); | |
281 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) | |
282 | real_dev->vlan_rx_add_vid(real_dev, vlan_id); | |
283 | ||
284 | if (vlan_proc_add_dev(dev) < 0) | |
40f98e1a PM |
285 | pr_warning("8021q: failed to add proc entry for %s\n", |
286 | dev->name); | |
e89fe42c PM |
287 | return 0; |
288 | ||
289 | out_free_group: | |
290 | if (ngrp) | |
291 | vlan_group_free(ngrp); | |
292 | return err; | |
293 | } | |
294 | ||
c1d3ee99 | 295 | /* Attach a VLAN device to a mac address (ie Ethernet Card). |
2ae0bf69 | 296 | * Returns 0 if the device was created or a negative error code otherwise. |
c1d3ee99 | 297 | */ |
2ae0bf69 PM |
298 | static int register_vlan_device(struct net_device *real_dev, |
299 | unsigned short VLAN_ID) | |
c1d3ee99 | 300 | { |
c1d3ee99 PM |
301 | struct net_device *new_dev; |
302 | char name[IFNAMSIZ]; | |
2ae0bf69 | 303 | int err; |
c1d3ee99 | 304 | |
c1d3ee99 | 305 | if (VLAN_ID >= VLAN_VID_MASK) |
2ae0bf69 | 306 | return -ERANGE; |
c1d3ee99 | 307 | |
2ae0bf69 PM |
308 | err = vlan_check_real_dev(real_dev, VLAN_ID); |
309 | if (err < 0) | |
310 | return err; | |
c1d3ee99 | 311 | |
1da177e4 | 312 | /* Gotta set up the fields for the device. */ |
1da177e4 LT |
313 | switch (vlan_name_type) { |
314 | case VLAN_NAME_TYPE_RAW_PLUS_VID: | |
315 | /* name will look like: eth1.0005 */ | |
316 | snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID); | |
317 | break; | |
318 | case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: | |
319 | /* Put our vlan.VID in the name. | |
320 | * Name will look like: vlan5 | |
321 | */ | |
322 | snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID); | |
323 | break; | |
324 | case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: | |
325 | /* Put our vlan.VID in the name. | |
326 | * Name will look like: eth0.5 | |
327 | */ | |
328 | snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID); | |
329 | break; | |
330 | case VLAN_NAME_TYPE_PLUS_VID: | |
331 | /* Put our vlan.VID in the name. | |
332 | * Name will look like: vlan0005 | |
333 | */ | |
334 | default: | |
335 | snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID); | |
3ff50b79 | 336 | } |
122952fc | 337 | |
1da177e4 LT |
338 | new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, |
339 | vlan_setup); | |
5dd8d1e9 | 340 | |
1da177e4 | 341 | if (new_dev == NULL) |
2ae0bf69 | 342 | return -ENOBUFS; |
1da177e4 | 343 | |
1da177e4 LT |
344 | /* need 4 bytes for extra VLAN header info, |
345 | * hope the underlying device can handle it. | |
346 | */ | |
347 | new_dev->mtu = real_dev->mtu; | |
348 | ||
9dfebcc6 PM |
349 | vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */ |
350 | vlan_dev_info(new_dev)->real_dev = real_dev; | |
351 | vlan_dev_info(new_dev)->dent = NULL; | |
352 | vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR; | |
1da177e4 | 353 | |
07b5b17e | 354 | new_dev->rtnl_link_ops = &vlan_link_ops; |
2ae0bf69 PM |
355 | err = register_vlan_dev(new_dev); |
356 | if (err < 0) | |
e89fe42c | 357 | goto out_free_newdev; |
1da177e4 | 358 | |
2ae0bf69 | 359 | return 0; |
1da177e4 | 360 | |
1da177e4 LT |
361 | out_free_newdev: |
362 | free_netdev(new_dev); | |
2ae0bf69 | 363 | return err; |
1da177e4 LT |
364 | } |
365 | ||
8c979c26 PM |
366 | static void vlan_sync_address(struct net_device *dev, |
367 | struct net_device *vlandev) | |
368 | { | |
9dfebcc6 | 369 | struct vlan_dev_info *vlan = vlan_dev_info(vlandev); |
8c979c26 PM |
370 | |
371 | /* May be called without an actual change */ | |
372 | if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr)) | |
373 | return; | |
374 | ||
375 | /* vlan address was different from the old address and is equal to | |
376 | * the new address */ | |
377 | if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
378 | !compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
379 | dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN); | |
380 | ||
381 | /* vlan address was equal to the old address and is different from | |
382 | * the new address */ | |
383 | if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
384 | compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
385 | dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN); | |
386 | ||
387 | memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); | |
388 | } | |
389 | ||
802fb176 PE |
390 | static void __vlan_device_event(struct net_device *dev, unsigned long event) |
391 | { | |
392 | switch (event) { | |
393 | case NETDEV_CHANGENAME: | |
394 | vlan_proc_rem_dev(dev); | |
395 | if (vlan_proc_add_dev(dev) < 0) | |
396 | pr_warning("8021q: failed to change proc name for %s\n", | |
397 | dev->name); | |
398 | break; | |
399 | } | |
400 | } | |
401 | ||
2029cc2c PM |
402 | static int vlan_device_event(struct notifier_block *unused, unsigned long event, |
403 | void *ptr) | |
1da177e4 LT |
404 | { |
405 | struct net_device *dev = ptr; | |
802fb176 | 406 | struct vlan_group *grp; |
1da177e4 LT |
407 | int i, flgs; |
408 | struct net_device *vlandev; | |
409 | ||
c346dca1 | 410 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
411 | return NOTIFY_DONE; |
412 | ||
802fb176 PE |
413 | if (is_vlan_dev(dev)) { |
414 | __vlan_device_event(dev, event); | |
415 | goto out; | |
416 | } | |
417 | ||
a9fde260 | 418 | grp = __vlan_find_group(dev); |
1da177e4 LT |
419 | if (!grp) |
420 | goto out; | |
421 | ||
422 | /* It is OK that we do not hold the group lock right now, | |
423 | * as we run under the RTNL lock. | |
424 | */ | |
425 | ||
426 | switch (event) { | |
427 | case NETDEV_CHANGE: | |
428 | /* Propagate real device state to vlan devices */ | |
1da177e4 | 429 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { |
5c15bdec | 430 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
431 | if (!vlandev) |
432 | continue; | |
433 | ||
ddd7bf9f | 434 | vlan_transfer_operstate(dev, vlandev); |
1da177e4 LT |
435 | } |
436 | break; | |
437 | ||
8c979c26 PM |
438 | case NETDEV_CHANGEADDR: |
439 | /* Adjust unicast filters on underlying device */ | |
440 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
441 | vlandev = vlan_group_get_device(grp, i); | |
442 | if (!vlandev) | |
443 | continue; | |
444 | ||
d932e04a PM |
445 | flgs = vlandev->flags; |
446 | if (!(flgs & IFF_UP)) | |
447 | continue; | |
448 | ||
8c979c26 PM |
449 | vlan_sync_address(dev, vlandev); |
450 | } | |
451 | break; | |
452 | ||
1da177e4 LT |
453 | case NETDEV_DOWN: |
454 | /* Put all VLANs for this dev in the down state too. */ | |
455 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 456 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
457 | if (!vlandev) |
458 | continue; | |
459 | ||
460 | flgs = vlandev->flags; | |
461 | if (!(flgs & IFF_UP)) | |
462 | continue; | |
463 | ||
464 | dev_change_flags(vlandev, flgs & ~IFF_UP); | |
465 | } | |
466 | break; | |
467 | ||
468 | case NETDEV_UP: | |
469 | /* Put all VLANs for this dev in the up state too. */ | |
470 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 471 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
472 | if (!vlandev) |
473 | continue; | |
122952fc | 474 | |
1da177e4 LT |
475 | flgs = vlandev->flags; |
476 | if (flgs & IFF_UP) | |
477 | continue; | |
478 | ||
479 | dev_change_flags(vlandev, flgs | IFF_UP); | |
480 | } | |
481 | break; | |
122952fc | 482 | |
1da177e4 LT |
483 | case NETDEV_UNREGISTER: |
484 | /* Delete all VLANs for this dev. */ | |
485 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 486 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
487 | if (!vlandev) |
488 | continue; | |
489 | ||
af301517 PM |
490 | /* unregistration of last vlan destroys group, abort |
491 | * afterwards */ | |
492 | if (grp->nr_vlans == 1) | |
493 | i = VLAN_GROUP_ARRAY_LEN; | |
1da177e4 | 494 | |
af301517 | 495 | unregister_vlan_dev(vlandev); |
1da177e4 LT |
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 | 600 | break; |
af301517 PM |
601 | unregister_vlan_dev(dev); |
602 | err = 0; | |
1da177e4 LT |
603 | break; |
604 | ||
1da177e4 | 605 | case GET_VLAN_REALDEV_NAME_CMD: |
3f5f4346 | 606 | err = 0; |
c17d8874 | 607 | vlan_dev_get_realdev_name(dev, args.u.device2); |
1da177e4 | 608 | if (copy_to_user(arg, &args, |
2029cc2c | 609 | sizeof(struct vlan_ioctl_args))) |
1da177e4 | 610 | err = -EFAULT; |
1da177e4 LT |
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, | |
2029cc2c | 618 | sizeof(struct vlan_ioctl_args))) |
122952fc | 619 | err = -EFAULT; |
1da177e4 LT |
620 | break; |
621 | ||
622 | default: | |
198a291c | 623 | err = -EOPNOTSUPP; |
c17d8874 | 624 | break; |
3ff50b79 | 625 | } |
7eb1b3d3 | 626 | out: |
c17d8874 | 627 | rtnl_unlock(); |
1da177e4 LT |
628 | return err; |
629 | } | |
630 | ||
d9ed0f0e PE |
631 | static int vlan_init_net(struct net *net) |
632 | { | |
633 | int err; | |
634 | struct vlan_net *vn; | |
635 | ||
636 | err = -ENOMEM; | |
637 | vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL); | |
638 | if (vn == NULL) | |
639 | goto err_alloc; | |
640 | ||
641 | err = net_assign_generic(net, vlan_net_id, vn); | |
642 | if (err < 0) | |
643 | goto err_assign; | |
644 | ||
cd1c7014 PE |
645 | err = vlan_proc_init(net); |
646 | if (err < 0) | |
647 | goto err_proc; | |
648 | ||
d9ed0f0e PE |
649 | return 0; |
650 | ||
cd1c7014 PE |
651 | err_proc: |
652 | /* nothing */ | |
d9ed0f0e PE |
653 | err_assign: |
654 | kfree(vn); | |
655 | err_alloc: | |
656 | return err; | |
657 | } | |
658 | ||
659 | static void vlan_exit_net(struct net *net) | |
660 | { | |
661 | struct vlan_net *vn; | |
662 | ||
663 | vn = net_generic(net, vlan_net_id); | |
cd1c7014 | 664 | vlan_proc_cleanup(net); |
d9ed0f0e PE |
665 | kfree(vn); |
666 | } | |
667 | ||
668 | static struct pernet_operations vlan_net_ops = { | |
669 | .init = vlan_init_net, | |
670 | .exit = vlan_exit_net, | |
671 | }; | |
672 | ||
69ab4b7d PM |
673 | static int __init vlan_proto_init(void) |
674 | { | |
675 | int err; | |
676 | ||
677 | pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); | |
678 | pr_info("All bugs added by %s\n", vlan_buggyright); | |
679 | ||
d9ed0f0e PE |
680 | err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops); |
681 | if (err < 0) | |
682 | goto err0; | |
683 | ||
69ab4b7d PM |
684 | err = register_netdevice_notifier(&vlan_notifier_block); |
685 | if (err < 0) | |
686 | goto err2; | |
687 | ||
688 | err = vlan_netlink_init(); | |
689 | if (err < 0) | |
690 | goto err3; | |
691 | ||
692 | dev_add_pack(&vlan_packet_type); | |
693 | vlan_ioctl_set(vlan_ioctl_handler); | |
694 | return 0; | |
695 | ||
696 | err3: | |
697 | unregister_netdevice_notifier(&vlan_notifier_block); | |
698 | err2: | |
d9ed0f0e PE |
699 | unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); |
700 | err0: | |
69ab4b7d PM |
701 | return err; |
702 | } | |
703 | ||
704 | static void __exit vlan_cleanup_module(void) | |
705 | { | |
706 | unsigned int i; | |
707 | ||
708 | vlan_ioctl_set(NULL); | |
709 | vlan_netlink_fini(); | |
710 | ||
711 | unregister_netdevice_notifier(&vlan_notifier_block); | |
712 | ||
713 | dev_remove_pack(&vlan_packet_type); | |
714 | ||
715 | /* This table must be empty if there are no module references left. */ | |
716 | for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) | |
717 | BUG_ON(!hlist_empty(&vlan_group_hash[i])); | |
718 | ||
d9ed0f0e PE |
719 | unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); |
720 | ||
69ab4b7d PM |
721 | synchronize_net(); |
722 | } | |
723 | ||
724 | module_init(vlan_proto_init); | |
725 | module_exit(vlan_cleanup_module); | |
726 | ||
1da177e4 LT |
727 | MODULE_LICENSE("GPL"); |
728 | MODULE_VERSION(DRV_VERSION); |