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