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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 | 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 | 156 | |
acc5efbc PM |
157 | /* Take it out of our own structures, but be sure to interlock with |
158 | * HW accelerating devices or SW vlan input packet processing. | |
159 | */ | |
160 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) | |
161 | real_dev->vlan_rx_kill_vid(real_dev, vlan_id); | |
1da177e4 | 162 | |
acc5efbc | 163 | vlan_group_set_device(grp, vlan_id, NULL); |
af301517 | 164 | grp->nr_vlans--; |
acc5efbc | 165 | |
af301517 | 166 | synchronize_net(); |
acc5efbc PM |
167 | |
168 | /* If the group is now empty, kill off the group. */ | |
af301517 | 169 | if (grp->nr_vlans == 0) { |
acc5efbc PM |
170 | if (real_dev->features & NETIF_F_HW_VLAN_RX) |
171 | real_dev->vlan_rx_register(real_dev, NULL); | |
172 | ||
173 | hlist_del_rcu(&grp->hlist); | |
1da177e4 | 174 | |
acc5efbc PM |
175 | /* Free the group, after all cpu's are done. */ |
176 | call_rcu(&grp->rcu, vlan_rcu_free); | |
1da177e4 LT |
177 | } |
178 | ||
af301517 PM |
179 | /* Get rid of the vlan's reference to real_dev */ |
180 | dev_put(real_dev); | |
1da177e4 | 181 | |
c17d8874 | 182 | unregister_netdevice(dev); |
1da177e4 LT |
183 | } |
184 | ||
2029cc2c PM |
185 | static void vlan_transfer_operstate(const struct net_device *dev, |
186 | struct net_device *vlandev) | |
ddd7bf9f SR |
187 | { |
188 | /* Have to respect userspace enforced dormant state | |
189 | * of real device, also must allow supplicant running | |
190 | * on VLAN device | |
191 | */ | |
192 | if (dev->operstate == IF_OPER_DORMANT) | |
193 | netif_dormant_on(vlandev); | |
194 | else | |
195 | netif_dormant_off(vlandev); | |
196 | ||
197 | if (netif_carrier_ok(dev)) { | |
198 | if (!netif_carrier_ok(vlandev)) | |
199 | netif_carrier_on(vlandev); | |
200 | } else { | |
201 | if (netif_carrier_ok(vlandev)) | |
202 | netif_carrier_off(vlandev); | |
203 | } | |
204 | } | |
205 | ||
07b5b17e | 206 | int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id) |
1da177e4 | 207 | { |
40f98e1a PM |
208 | char *name = real_dev->name; |
209 | ||
1da177e4 | 210 | if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { |
40f98e1a | 211 | pr_info("8021q: VLANs not supported on %s\n", name); |
c1d3ee99 | 212 | return -EOPNOTSUPP; |
1da177e4 LT |
213 | } |
214 | ||
215 | if ((real_dev->features & NETIF_F_HW_VLAN_RX) && | |
d2d1acdb | 216 | !real_dev->vlan_rx_register) { |
40f98e1a | 217 | pr_info("8021q: device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 218 | return -EOPNOTSUPP; |
1da177e4 LT |
219 | } |
220 | ||
221 | if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) && | |
d2d1acdb | 222 | (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) { |
40f98e1a | 223 | pr_info("8021q: Device %s has buggy VLAN hw accel\n", name); |
c1d3ee99 | 224 | return -EOPNOTSUPP; |
1da177e4 LT |
225 | } |
226 | ||
1da177e4 LT |
227 | /* The real device must be up and operating in order to |
228 | * assosciate a VLAN device with it. | |
229 | */ | |
230 | if (!(real_dev->flags & IFF_UP)) | |
c1d3ee99 | 231 | return -ENETDOWN; |
1da177e4 | 232 | |
40f98e1a | 233 | if (__find_vlan_dev(real_dev, vlan_id) != NULL) |
c1d3ee99 | 234 | return -EEXIST; |
1da177e4 | 235 | |
c1d3ee99 PM |
236 | return 0; |
237 | } | |
238 | ||
07b5b17e | 239 | int register_vlan_dev(struct net_device *dev) |
e89fe42c | 240 | { |
9dfebcc6 | 241 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
e89fe42c PM |
242 | struct net_device *real_dev = vlan->real_dev; |
243 | unsigned short vlan_id = vlan->vlan_id; | |
244 | struct vlan_group *grp, *ngrp = NULL; | |
245 | int err; | |
246 | ||
a9fde260 | 247 | grp = __vlan_find_group(real_dev); |
e89fe42c | 248 | if (!grp) { |
a9fde260 | 249 | ngrp = grp = vlan_group_alloc(real_dev); |
e89fe42c PM |
250 | if (!grp) |
251 | return -ENOBUFS; | |
252 | } | |
253 | ||
67727184 PE |
254 | err = vlan_group_prealloc_vid(grp, vlan_id); |
255 | if (err < 0) | |
256 | goto out_free_group; | |
257 | ||
e89fe42c PM |
258 | err = register_netdevice(dev); |
259 | if (err < 0) | |
260 | goto out_free_group; | |
261 | ||
262 | /* Account for reference in struct vlan_dev_info */ | |
263 | dev_hold(real_dev); | |
264 | ||
265 | vlan_transfer_operstate(real_dev, dev); | |
266 | linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ | |
267 | ||
268 | /* So, got the sucker initialized, now lets place | |
269 | * it into our local structure. | |
270 | */ | |
271 | vlan_group_set_device(grp, vlan_id, dev); | |
af301517 PM |
272 | grp->nr_vlans++; |
273 | ||
e89fe42c PM |
274 | if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX) |
275 | real_dev->vlan_rx_register(real_dev, ngrp); | |
276 | if (real_dev->features & NETIF_F_HW_VLAN_FILTER) | |
277 | real_dev->vlan_rx_add_vid(real_dev, vlan_id); | |
278 | ||
e89fe42c PM |
279 | return 0; |
280 | ||
281 | out_free_group: | |
282 | if (ngrp) | |
283 | vlan_group_free(ngrp); | |
284 | return err; | |
285 | } | |
286 | ||
c1d3ee99 | 287 | /* Attach a VLAN device to a mac address (ie Ethernet Card). |
2ae0bf69 | 288 | * Returns 0 if the device was created or a negative error code otherwise. |
c1d3ee99 | 289 | */ |
2ae0bf69 PM |
290 | static int register_vlan_device(struct net_device *real_dev, |
291 | unsigned short VLAN_ID) | |
c1d3ee99 | 292 | { |
c1d3ee99 | 293 | struct net_device *new_dev; |
7a17a2f7 PE |
294 | struct net *net = dev_net(real_dev); |
295 | struct vlan_net *vn = net_generic(net, vlan_net_id); | |
c1d3ee99 | 296 | char name[IFNAMSIZ]; |
2ae0bf69 | 297 | int err; |
c1d3ee99 | 298 | |
c1d3ee99 | 299 | if (VLAN_ID >= VLAN_VID_MASK) |
2ae0bf69 | 300 | return -ERANGE; |
c1d3ee99 | 301 | |
2ae0bf69 PM |
302 | err = vlan_check_real_dev(real_dev, VLAN_ID); |
303 | if (err < 0) | |
304 | return err; | |
c1d3ee99 | 305 | |
1da177e4 | 306 | /* Gotta set up the fields for the device. */ |
7a17a2f7 | 307 | switch (vn->name_type) { |
1da177e4 LT |
308 | case VLAN_NAME_TYPE_RAW_PLUS_VID: |
309 | /* name will look like: eth1.0005 */ | |
310 | snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID); | |
311 | break; | |
312 | case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: | |
313 | /* Put our vlan.VID in the name. | |
314 | * Name will look like: vlan5 | |
315 | */ | |
316 | snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID); | |
317 | break; | |
318 | case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: | |
319 | /* Put our vlan.VID in the name. | |
320 | * Name will look like: eth0.5 | |
321 | */ | |
322 | snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID); | |
323 | break; | |
324 | case VLAN_NAME_TYPE_PLUS_VID: | |
325 | /* Put our vlan.VID in the name. | |
326 | * Name will look like: vlan0005 | |
327 | */ | |
328 | default: | |
329 | snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID); | |
3ff50b79 | 330 | } |
122952fc | 331 | |
1da177e4 LT |
332 | new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, |
333 | vlan_setup); | |
5dd8d1e9 | 334 | |
1da177e4 | 335 | if (new_dev == NULL) |
2ae0bf69 | 336 | return -ENOBUFS; |
1da177e4 | 337 | |
65d292a2 | 338 | dev_net_set(new_dev, net); |
1da177e4 LT |
339 | /* need 4 bytes for extra VLAN header info, |
340 | * hope the underlying device can handle it. | |
341 | */ | |
342 | new_dev->mtu = real_dev->mtu; | |
343 | ||
9dfebcc6 PM |
344 | vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */ |
345 | vlan_dev_info(new_dev)->real_dev = real_dev; | |
346 | vlan_dev_info(new_dev)->dent = NULL; | |
347 | vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR; | |
1da177e4 | 348 | |
07b5b17e | 349 | new_dev->rtnl_link_ops = &vlan_link_ops; |
2ae0bf69 PM |
350 | err = register_vlan_dev(new_dev); |
351 | if (err < 0) | |
e89fe42c | 352 | goto out_free_newdev; |
1da177e4 | 353 | |
2ae0bf69 | 354 | return 0; |
1da177e4 | 355 | |
1da177e4 LT |
356 | out_free_newdev: |
357 | free_netdev(new_dev); | |
2ae0bf69 | 358 | return err; |
1da177e4 LT |
359 | } |
360 | ||
8c979c26 PM |
361 | static void vlan_sync_address(struct net_device *dev, |
362 | struct net_device *vlandev) | |
363 | { | |
9dfebcc6 | 364 | struct vlan_dev_info *vlan = vlan_dev_info(vlandev); |
8c979c26 PM |
365 | |
366 | /* May be called without an actual change */ | |
367 | if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr)) | |
368 | return; | |
369 | ||
370 | /* vlan address was different from the old address and is equal to | |
371 | * the new address */ | |
372 | if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
373 | !compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
374 | dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN); | |
375 | ||
376 | /* vlan address was equal to the old address and is different from | |
377 | * the new address */ | |
378 | if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && | |
379 | compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) | |
380 | dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN); | |
381 | ||
382 | memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); | |
383 | } | |
384 | ||
802fb176 PE |
385 | static void __vlan_device_event(struct net_device *dev, unsigned long event) |
386 | { | |
387 | switch (event) { | |
388 | case NETDEV_CHANGENAME: | |
389 | vlan_proc_rem_dev(dev); | |
390 | if (vlan_proc_add_dev(dev) < 0) | |
391 | pr_warning("8021q: failed to change proc name for %s\n", | |
392 | dev->name); | |
393 | break; | |
30688a9a PE |
394 | case NETDEV_REGISTER: |
395 | if (vlan_proc_add_dev(dev) < 0) | |
396 | pr_warning("8021q: failed to add proc entry for %s\n", | |
397 | dev->name); | |
398 | break; | |
399 | case NETDEV_UNREGISTER: | |
400 | vlan_proc_rem_dev(dev); | |
401 | break; | |
802fb176 PE |
402 | } |
403 | } | |
404 | ||
2029cc2c PM |
405 | static int vlan_device_event(struct notifier_block *unused, unsigned long event, |
406 | void *ptr) | |
1da177e4 LT |
407 | { |
408 | struct net_device *dev = ptr; | |
802fb176 | 409 | struct vlan_group *grp; |
1da177e4 LT |
410 | int i, flgs; |
411 | struct net_device *vlandev; | |
412 | ||
81d85346 | 413 | if (is_vlan_dev(dev)) |
802fb176 | 414 | __vlan_device_event(dev, event); |
802fb176 | 415 | |
a9fde260 | 416 | grp = __vlan_find_group(dev); |
1da177e4 LT |
417 | if (!grp) |
418 | goto out; | |
419 | ||
420 | /* It is OK that we do not hold the group lock right now, | |
421 | * as we run under the RTNL lock. | |
422 | */ | |
423 | ||
424 | switch (event) { | |
425 | case NETDEV_CHANGE: | |
426 | /* Propagate real device state to vlan devices */ | |
1da177e4 | 427 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { |
5c15bdec | 428 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
429 | if (!vlandev) |
430 | continue; | |
431 | ||
ddd7bf9f | 432 | vlan_transfer_operstate(dev, vlandev); |
1da177e4 LT |
433 | } |
434 | break; | |
435 | ||
8c979c26 PM |
436 | case NETDEV_CHANGEADDR: |
437 | /* Adjust unicast filters on underlying device */ | |
438 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
439 | vlandev = vlan_group_get_device(grp, i); | |
440 | if (!vlandev) | |
441 | continue; | |
442 | ||
d932e04a PM |
443 | flgs = vlandev->flags; |
444 | if (!(flgs & IFF_UP)) | |
445 | continue; | |
446 | ||
8c979c26 PM |
447 | vlan_sync_address(dev, vlandev); |
448 | } | |
449 | break; | |
450 | ||
1da177e4 LT |
451 | case NETDEV_DOWN: |
452 | /* Put all VLANs for this dev in the down state too. */ | |
453 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 454 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
455 | if (!vlandev) |
456 | continue; | |
457 | ||
458 | flgs = vlandev->flags; | |
459 | if (!(flgs & IFF_UP)) | |
460 | continue; | |
461 | ||
462 | dev_change_flags(vlandev, flgs & ~IFF_UP); | |
463 | } | |
464 | break; | |
465 | ||
466 | case NETDEV_UP: | |
467 | /* Put all VLANs for this dev in the up state too. */ | |
468 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 469 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
470 | if (!vlandev) |
471 | continue; | |
122952fc | 472 | |
1da177e4 LT |
473 | flgs = vlandev->flags; |
474 | if (flgs & IFF_UP) | |
475 | continue; | |
476 | ||
477 | dev_change_flags(vlandev, flgs | IFF_UP); | |
478 | } | |
479 | break; | |
122952fc | 480 | |
1da177e4 LT |
481 | case NETDEV_UNREGISTER: |
482 | /* Delete all VLANs for this dev. */ | |
483 | for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { | |
5c15bdec | 484 | vlandev = vlan_group_get_device(grp, i); |
1da177e4 LT |
485 | if (!vlandev) |
486 | continue; | |
487 | ||
af301517 PM |
488 | /* unregistration of last vlan destroys group, abort |
489 | * afterwards */ | |
490 | if (grp->nr_vlans == 1) | |
491 | i = VLAN_GROUP_ARRAY_LEN; | |
1da177e4 | 492 | |
af301517 | 493 | unregister_vlan_dev(vlandev); |
1da177e4 LT |
494 | } |
495 | break; | |
3ff50b79 | 496 | } |
1da177e4 LT |
497 | |
498 | out: | |
499 | return NOTIFY_DONE; | |
500 | } | |
501 | ||
69ab4b7d PM |
502 | static struct notifier_block vlan_notifier_block __read_mostly = { |
503 | .notifier_call = vlan_device_event, | |
504 | }; | |
505 | ||
1da177e4 LT |
506 | /* |
507 | * VLAN IOCTL handler. | |
508 | * o execute requested action or pass command to the device driver | |
509 | * arg is really a struct vlan_ioctl_args __user *. | |
510 | */ | |
881d966b | 511 | static int vlan_ioctl_handler(struct net *net, void __user *arg) |
1da177e4 | 512 | { |
c17d8874 | 513 | int err; |
1da177e4 LT |
514 | unsigned short vid = 0; |
515 | struct vlan_ioctl_args args; | |
c17d8874 | 516 | struct net_device *dev = NULL; |
1da177e4 LT |
517 | |
518 | if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) | |
519 | return -EFAULT; | |
520 | ||
521 | /* Null terminate this sucker, just in case. */ | |
522 | args.device1[23] = 0; | |
523 | args.u.device2[23] = 0; | |
524 | ||
c17d8874 PM |
525 | rtnl_lock(); |
526 | ||
1da177e4 LT |
527 | switch (args.cmd) { |
528 | case SET_VLAN_INGRESS_PRIORITY_CMD: | |
c17d8874 PM |
529 | case SET_VLAN_EGRESS_PRIORITY_CMD: |
530 | case SET_VLAN_FLAG_CMD: | |
531 | case ADD_VLAN_CMD: | |
532 | case DEL_VLAN_CMD: | |
533 | case GET_VLAN_REALDEV_NAME_CMD: | |
534 | case GET_VLAN_VID_CMD: | |
535 | err = -ENODEV; | |
65d292a2 | 536 | dev = __dev_get_by_name(net, args.device1); |
c17d8874 PM |
537 | if (!dev) |
538 | goto out; | |
539 | ||
540 | err = -EINVAL; | |
541 | if (args.cmd != ADD_VLAN_CMD && | |
542 | !(dev->priv_flags & IFF_802_1Q_VLAN)) | |
543 | goto out; | |
544 | } | |
545 | ||
546 | switch (args.cmd) { | |
547 | case SET_VLAN_INGRESS_PRIORITY_CMD: | |
548 | err = -EPERM; | |
1da177e4 | 549 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
550 | break; |
551 | vlan_dev_set_ingress_priority(dev, | |
552 | args.u.skb_priority, | |
553 | args.vlan_qos); | |
fffe470a | 554 | err = 0; |
1da177e4 LT |
555 | break; |
556 | ||
557 | case SET_VLAN_EGRESS_PRIORITY_CMD: | |
c17d8874 | 558 | err = -EPERM; |
1da177e4 | 559 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
560 | break; |
561 | err = vlan_dev_set_egress_priority(dev, | |
1da177e4 LT |
562 | args.u.skb_priority, |
563 | args.vlan_qos); | |
564 | break; | |
565 | ||
566 | case SET_VLAN_FLAG_CMD: | |
c17d8874 | 567 | err = -EPERM; |
1da177e4 | 568 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 PM |
569 | break; |
570 | err = vlan_dev_set_vlan_flag(dev, | |
1da177e4 LT |
571 | args.u.flag, |
572 | args.vlan_qos); | |
573 | break; | |
574 | ||
575 | case SET_VLAN_NAME_TYPE_CMD: | |
c17d8874 | 576 | err = -EPERM; |
1da177e4 | 577 | if (!capable(CAP_NET_ADMIN)) |
e35de026 | 578 | break; |
c17d8874 PM |
579 | if ((args.u.name_type >= 0) && |
580 | (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { | |
7a17a2f7 PE |
581 | struct vlan_net *vn; |
582 | ||
583 | vn = net_generic(net, vlan_net_id); | |
584 | vn->name_type = args.u.name_type; | |
1da177e4 LT |
585 | err = 0; |
586 | } else { | |
587 | err = -EINVAL; | |
588 | } | |
589 | break; | |
590 | ||
591 | case ADD_VLAN_CMD: | |
c17d8874 | 592 | err = -EPERM; |
1da177e4 | 593 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 | 594 | break; |
2ae0bf69 | 595 | err = register_vlan_device(dev, args.u.VID); |
1da177e4 LT |
596 | break; |
597 | ||
598 | case DEL_VLAN_CMD: | |
c17d8874 | 599 | err = -EPERM; |
1da177e4 | 600 | if (!capable(CAP_NET_ADMIN)) |
c17d8874 | 601 | break; |
af301517 PM |
602 | unregister_vlan_dev(dev); |
603 | err = 0; | |
1da177e4 LT |
604 | break; |
605 | ||
1da177e4 | 606 | case GET_VLAN_REALDEV_NAME_CMD: |
3f5f4346 | 607 | err = 0; |
c17d8874 | 608 | vlan_dev_get_realdev_name(dev, args.u.device2); |
1da177e4 | 609 | if (copy_to_user(arg, &args, |
2029cc2c | 610 | sizeof(struct vlan_ioctl_args))) |
1da177e4 | 611 | err = -EFAULT; |
1da177e4 LT |
612 | break; |
613 | ||
614 | case GET_VLAN_VID_CMD: | |
3f5f4346 | 615 | err = 0; |
c17d8874 | 616 | vlan_dev_get_vid(dev, &vid); |
1da177e4 LT |
617 | args.u.VID = vid; |
618 | if (copy_to_user(arg, &args, | |
2029cc2c | 619 | sizeof(struct vlan_ioctl_args))) |
122952fc | 620 | err = -EFAULT; |
1da177e4 LT |
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 | ||
d9ed0f0e PE |
632 | static int vlan_init_net(struct net *net) |
633 | { | |
634 | int err; | |
635 | struct vlan_net *vn; | |
636 | ||
637 | err = -ENOMEM; | |
638 | vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL); | |
639 | if (vn == NULL) | |
640 | goto err_alloc; | |
641 | ||
642 | err = net_assign_generic(net, vlan_net_id, vn); | |
643 | if (err < 0) | |
644 | goto err_assign; | |
645 | ||
7a17a2f7 PE |
646 | vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; |
647 | ||
cd1c7014 PE |
648 | err = vlan_proc_init(net); |
649 | if (err < 0) | |
650 | goto err_proc; | |
651 | ||
d9ed0f0e PE |
652 | return 0; |
653 | ||
cd1c7014 PE |
654 | err_proc: |
655 | /* nothing */ | |
d9ed0f0e PE |
656 | err_assign: |
657 | kfree(vn); | |
658 | err_alloc: | |
659 | return err; | |
660 | } | |
661 | ||
662 | static void vlan_exit_net(struct net *net) | |
663 | { | |
664 | struct vlan_net *vn; | |
665 | ||
666 | vn = net_generic(net, vlan_net_id); | |
65d292a2 | 667 | rtnl_kill_links(net, &vlan_link_ops); |
cd1c7014 | 668 | vlan_proc_cleanup(net); |
d9ed0f0e PE |
669 | kfree(vn); |
670 | } | |
671 | ||
672 | static struct pernet_operations vlan_net_ops = { | |
673 | .init = vlan_init_net, | |
674 | .exit = vlan_exit_net, | |
675 | }; | |
676 | ||
69ab4b7d PM |
677 | static int __init vlan_proto_init(void) |
678 | { | |
679 | int err; | |
680 | ||
681 | pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); | |
682 | pr_info("All bugs added by %s\n", vlan_buggyright); | |
683 | ||
d9ed0f0e PE |
684 | err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops); |
685 | if (err < 0) | |
686 | goto err0; | |
687 | ||
69ab4b7d PM |
688 | err = register_netdevice_notifier(&vlan_notifier_block); |
689 | if (err < 0) | |
690 | goto err2; | |
691 | ||
692 | err = vlan_netlink_init(); | |
693 | if (err < 0) | |
694 | goto err3; | |
695 | ||
696 | dev_add_pack(&vlan_packet_type); | |
697 | vlan_ioctl_set(vlan_ioctl_handler); | |
698 | return 0; | |
699 | ||
700 | err3: | |
701 | unregister_netdevice_notifier(&vlan_notifier_block); | |
702 | err2: | |
d9ed0f0e PE |
703 | unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); |
704 | err0: | |
69ab4b7d PM |
705 | return err; |
706 | } | |
707 | ||
708 | static void __exit vlan_cleanup_module(void) | |
709 | { | |
710 | unsigned int i; | |
711 | ||
712 | vlan_ioctl_set(NULL); | |
713 | vlan_netlink_fini(); | |
714 | ||
715 | unregister_netdevice_notifier(&vlan_notifier_block); | |
716 | ||
717 | dev_remove_pack(&vlan_packet_type); | |
718 | ||
719 | /* This table must be empty if there are no module references left. */ | |
720 | for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) | |
721 | BUG_ON(!hlist_empty(&vlan_group_hash[i])); | |
722 | ||
d9ed0f0e PE |
723 | unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); |
724 | ||
69ab4b7d PM |
725 | synchronize_net(); |
726 | } | |
727 | ||
728 | module_init(vlan_proto_init); | |
729 | module_exit(vlan_cleanup_module); | |
730 | ||
1da177e4 LT |
731 | MODULE_LICENSE("GPL"); |
732 | MODULE_VERSION(DRV_VERSION); |