blob: 9f04cab92f95f393e0ee202dfa74fcb74d358cbb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET 802.1Q VLAN
3 * Ethernet-type device handling.
4 *
5 * Authors: Ben Greear <greearb@candelatech.com>
Patrick McHardyad712082008-01-21 00:27:00 -08006 * Please send support related email to: netdev@vger.kernel.org
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +09008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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
Randy Dunlap4fc268d2006-01-11 12:17:47 -080021#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/module.h>
23#include <linux/netdevice.h>
24#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/rtnetlink.h>
27#include <linux/notifier.h>
Patrick McHardy61362762008-07-14 22:51:55 -070028#include <net/rtnetlink.h>
Eric W. Biedermane9dc8652007-09-12 13:02:17 +020029#include <net/net_namespace.h>
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -070030#include <net/netns/generic.h>
Patrick McHardy61362762008-07-14 22:51:55 -070031#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33#include <linux/if_vlan.h>
34#include "vlan.h"
35#include "vlanproc.h"
36
37#define DRV_VERSION "1.8"
38
39/* Global VLAN variables */
40
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -070041int vlan_net_id;
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043/* Our listing of VLAN group(s) */
44static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46static char vlan_fullname[] = "802.1Q VLAN Support";
47static char vlan_version[] = DRV_VERSION;
48static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
49static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051static struct packet_type vlan_packet_type = {
52 .type = __constant_htons(ETH_P_8021Q),
53 .func = vlan_skb_recv, /* VLAN receive method */
54};
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056/* End of global variables definitions. */
57
Patrick McHardy2029cc22008-01-21 00:26:41 -080058static inline unsigned int vlan_grp_hashfn(unsigned int idx)
59{
60 return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
61}
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063/* Must be invoked with RCU read lock (no preempt) */
Pavel Emelyanova9fde262008-04-16 00:48:04 -070064static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
66 struct vlan_group *grp;
67 struct hlist_node *n;
Pavel Emelyanova9fde262008-04-16 00:48:04 -070068 int hash = vlan_grp_hashfn(real_dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70 hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
Pavel Emelyanova9fde262008-04-16 00:48:04 -070071 if (grp->real_dev == real_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 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 */
Patrick McHardy9bb85822008-07-08 03:24:44 -070082struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
Pavel Emelyanova9fde262008-04-16 00:48:04 -070084 struct vlan_group *grp = __vlan_find_group(real_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86 if (grp)
Patrick McHardy9bb85822008-07-08 03:24:44 -070087 return vlan_group_get_device(grp, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89 return NULL;
90}
91
Dan Aloni5c15bde2007-03-02 20:44:51 -080092static void vlan_group_free(struct vlan_group *grp)
93{
94 int i;
95
Patrick McHardy2029cc22008-01-21 00:26:41 -080096 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
Dan Aloni5c15bde2007-03-02 20:44:51 -080097 kfree(grp->vlan_devices_arrays[i]);
98 kfree(grp);
99}
100
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700101static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
Patrick McHardy42429aa2007-06-13 12:05:59 -0700102{
103 struct vlan_group *grp;
Patrick McHardy42429aa2007-06-13 12:05:59 -0700104
105 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
106 if (!grp)
107 return NULL;
108
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700109 grp->real_dev = real_dev;
Patrick McHardy42429aa2007-06-13 12:05:59 -0700110 hlist_add_head_rcu(&grp->hlist,
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700111 &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
Patrick McHardy42429aa2007-06-13 12:05:59 -0700112 return grp;
Pavel Emelyanov67727182008-03-26 16:27:22 -0700113}
Patrick McHardy42429aa2007-06-13 12:05:59 -0700114
Patrick McHardy9bb85822008-07-08 03:24:44 -0700115static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
Pavel Emelyanov67727182008-03-26 16:27:22 -0700116{
117 struct net_device **array;
118 unsigned int size;
119
120 ASSERT_RTNL();
121
Patrick McHardy9bb85822008-07-08 03:24:44 -0700122 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
Pavel Emelyanov67727182008-03-26 16:27:22 -0700123 if (array != NULL)
124 return 0;
125
126 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
127 array = kzalloc(size, GFP_KERNEL);
128 if (array == NULL)
129 return -ENOBUFS;
130
Patrick McHardy9bb85822008-07-08 03:24:44 -0700131 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
Pavel Emelyanov67727182008-03-26 16:27:22 -0700132 return 0;
Patrick McHardy42429aa2007-06-13 12:05:59 -0700133}
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135static void vlan_rcu_free(struct rcu_head *rcu)
136{
Dan Aloni5c15bde2007-03-02 20:44:51 -0800137 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138}
139
Patrick McHardyaf301512008-01-21 00:25:50 -0800140void unregister_vlan_dev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800142 struct vlan_dev_info *vlan = vlan_dev_info(dev);
Patrick McHardyaf301512008-01-21 00:25:50 -0800143 struct net_device *real_dev = vlan->real_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 struct vlan_group *grp;
Patrick McHardy9bb85822008-07-08 03:24:44 -0700145 u16 vlan_id = vlan->vlan_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147 ASSERT_RTNL();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700149 grp = __vlan_find_group(real_dev);
Patrick McHardyaf301512008-01-21 00:25:50 -0800150 BUG_ON(!grp);
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800151
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800152 /* Take it out of our own structures, but be sure to interlock with
153 * HW accelerating devices or SW vlan input packet processing.
154 */
155 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
156 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
157
158 vlan_group_set_device(grp, vlan_id, NULL);
Patrick McHardyaf301512008-01-21 00:25:50 -0800159 grp->nr_vlans--;
160
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800161 synchronize_net();
162
Patrick McHardyce305002008-07-05 21:26:41 -0700163 unregister_netdevice(dev);
164
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800165 /* If the group is now empty, kill off the group. */
Patrick McHardyaf301512008-01-21 00:25:50 -0800166 if (grp->nr_vlans == 0) {
Patrick McHardy70c03b42008-07-05 21:26:57 -0700167 vlan_gvrp_uninit_applicant(real_dev);
168
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800169 if (real_dev->features & NETIF_F_HW_VLAN_RX)
170 real_dev->vlan_rx_register(real_dev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800172 hlist_del_rcu(&grp->hlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800174 /* Free the group, after all cpu's are done. */
175 call_rcu(&grp->rcu, vlan_rcu_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 }
177
Patrick McHardyaf301512008-01-21 00:25:50 -0800178 /* Get rid of the vlan's reference to real_dev */
179 dev_put(real_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180}
181
Patrick McHardy2029cc22008-01-21 00:26:41 -0800182static void vlan_transfer_operstate(const struct net_device *dev,
183 struct net_device *vlandev)
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800184{
185 /* Have to respect userspace enforced dormant state
186 * of real device, also must allow supplicant running
187 * on VLAN device
188 */
189 if (dev->operstate == IF_OPER_DORMANT)
190 netif_dormant_on(vlandev);
191 else
192 netif_dormant_off(vlandev);
193
194 if (netif_carrier_ok(dev)) {
195 if (!netif_carrier_ok(vlandev))
196 netif_carrier_on(vlandev);
197 } else {
198 if (netif_carrier_ok(vlandev))
199 netif_carrier_off(vlandev);
200 }
201}
202
Patrick McHardy9bb85822008-07-08 03:24:44 -0700203int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700204{
Patrick McHardy40f98e12008-01-21 00:24:30 -0800205 char *name = real_dev->name;
206
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700207 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800208 pr_info("8021q: VLANs not supported on %s\n", name);
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700209 return -EOPNOTSUPP;
210 }
211
212 if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
213 !real_dev->vlan_rx_register) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800214 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700215 return -EOPNOTSUPP;
216 }
217
218 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
219 (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800220 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700221 return -EOPNOTSUPP;
222 }
223
224 /* The real device must be up and operating in order to
225 * assosciate a VLAN device with it.
226 */
227 if (!(real_dev->flags & IFF_UP))
228 return -ENETDOWN;
229
Patrick McHardy40f98e12008-01-21 00:24:30 -0800230 if (__find_vlan_dev(real_dev, vlan_id) != NULL)
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700231 return -EEXIST;
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700232
233 return 0;
234}
235
Patrick McHardy07b5b172007-06-13 12:07:54 -0700236int register_vlan_dev(struct net_device *dev)
Patrick McHardye89fe422007-06-13 12:06:29 -0700237{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800238 struct vlan_dev_info *vlan = vlan_dev_info(dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700239 struct net_device *real_dev = vlan->real_dev;
Patrick McHardy9bb85822008-07-08 03:24:44 -0700240 u16 vlan_id = vlan->vlan_id;
Patrick McHardye89fe422007-06-13 12:06:29 -0700241 struct vlan_group *grp, *ngrp = NULL;
242 int err;
243
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700244 grp = __vlan_find_group(real_dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700245 if (!grp) {
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700246 ngrp = grp = vlan_group_alloc(real_dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700247 if (!grp)
248 return -ENOBUFS;
Patrick McHardy70c03b42008-07-05 21:26:57 -0700249 err = vlan_gvrp_init_applicant(real_dev);
250 if (err < 0)
251 goto out_free_group;
Patrick McHardye89fe422007-06-13 12:06:29 -0700252 }
253
Pavel Emelyanov67727182008-03-26 16:27:22 -0700254 err = vlan_group_prealloc_vid(grp, vlan_id);
255 if (err < 0)
Patrick McHardy70c03b42008-07-05 21:26:57 -0700256 goto out_uninit_applicant;
Pavel Emelyanov67727182008-03-26 16:27:22 -0700257
Patrick McHardye89fe422007-06-13 12:06:29 -0700258 err = register_netdevice(dev);
259 if (err < 0)
Patrick McHardy70c03b42008-07-05 21:26:57 -0700260 goto out_uninit_applicant;
Patrick McHardye89fe422007-06-13 12:06:29 -0700261
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);
Patrick McHardyaf301512008-01-21 00:25:50 -0800272 grp->nr_vlans++;
273
Patrick McHardye89fe422007-06-13 12:06:29 -0700274 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
Patrick McHardye89fe422007-06-13 12:06:29 -0700279 return 0;
280
Patrick McHardy70c03b42008-07-05 21:26:57 -0700281out_uninit_applicant:
282 if (ngrp)
283 vlan_gvrp_uninit_applicant(real_dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700284out_free_group:
285 if (ngrp)
286 vlan_group_free(ngrp);
287 return err;
288}
289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290/* Attach a VLAN device to a mac address (ie Ethernet Card).
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700291 * Returns 0 if the device was created or a negative error code otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700293static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 struct net_device *new_dev;
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700296 struct net *net = dev_net(real_dev);
297 struct vlan_net *vn = net_generic(net, vlan_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 char name[IFNAMSIZ];
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700299 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Patrick McHardy9bb85822008-07-08 03:24:44 -0700301 if (vlan_id >= VLAN_VID_MASK)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700302 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Patrick McHardy9bb85822008-07-08 03:24:44 -0700304 err = vlan_check_real_dev(real_dev, vlan_id);
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700305 if (err < 0)
306 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
308 /* Gotta set up the fields for the device. */
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700309 switch (vn->name_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 case VLAN_NAME_TYPE_RAW_PLUS_VID:
311 /* name will look like: eth1.0005 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700312 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 break;
314 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
315 /* Put our vlan.VID in the name.
316 * Name will look like: vlan5
317 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700318 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 break;
320 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
321 /* Put our vlan.VID in the name.
322 * Name will look like: eth0.5
323 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700324 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 break;
326 case VLAN_NAME_TYPE_PLUS_VID:
327 /* Put our vlan.VID in the name.
328 * Name will look like: vlan0005
329 */
330 default:
Patrick McHardy9bb85822008-07-08 03:24:44 -0700331 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700332 }
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
335 vlan_setup);
Arjan van de Ven5dd8d1e2006-07-03 00:25:33 -0700336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (new_dev == NULL)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700338 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Pavel Emelyanov65d292a2008-04-16 00:55:06 -0700340 dev_net_set(new_dev, net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 /* need 4 bytes for extra VLAN header info,
342 * hope the underlying device can handle it.
343 */
344 new_dev->mtu = real_dev->mtu;
345
Patrick McHardy9bb85822008-07-08 03:24:44 -0700346 vlan_dev_info(new_dev)->vlan_id = vlan_id;
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800347 vlan_dev_info(new_dev)->real_dev = real_dev;
348 vlan_dev_info(new_dev)->dent = NULL;
349 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Patrick McHardy07b5b172007-06-13 12:07:54 -0700351 new_dev->rtnl_link_ops = &vlan_link_ops;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700352 err = register_vlan_dev(new_dev);
353 if (err < 0)
Patrick McHardye89fe422007-06-13 12:06:29 -0700354 goto out_free_newdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700356 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358out_free_newdev:
359 free_netdev(new_dev);
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700360 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361}
362
Patrick McHardy8c979c22007-07-11 19:45:24 -0700363static void vlan_sync_address(struct net_device *dev,
364 struct net_device *vlandev)
365{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800366 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
Patrick McHardy8c979c22007-07-11 19:45:24 -0700367
368 /* May be called without an actual change */
369 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
370 return;
371
372 /* vlan address was different from the old address and is equal to
373 * the new address */
374 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
375 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
376 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
377
378 /* vlan address was equal to the old address and is different from
379 * the new address */
380 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
381 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
382 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
383
384 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
385}
386
Patrick McHardy5fb13572008-05-20 14:54:50 -0700387static void vlan_transfer_features(struct net_device *dev,
388 struct net_device *vlandev)
389{
390 unsigned long old_features = vlandev->features;
391
Patrick McHardy289c79a2008-05-23 00:22:04 -0700392 vlandev->features &= ~dev->vlan_features;
393 vlandev->features |= dev->features & dev->vlan_features;
Patrick McHardy5fb13572008-05-20 14:54:50 -0700394
395 if (old_features != vlandev->features)
396 netdev_features_change(vlandev);
397}
398
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700399static void __vlan_device_event(struct net_device *dev, unsigned long event)
400{
401 switch (event) {
402 case NETDEV_CHANGENAME:
403 vlan_proc_rem_dev(dev);
404 if (vlan_proc_add_dev(dev) < 0)
405 pr_warning("8021q: failed to change proc name for %s\n",
406 dev->name);
407 break;
Pavel Emelyanov30688a92008-04-16 00:57:01 -0700408 case NETDEV_REGISTER:
409 if (vlan_proc_add_dev(dev) < 0)
410 pr_warning("8021q: failed to add proc entry for %s\n",
411 dev->name);
412 break;
413 case NETDEV_UNREGISTER:
414 vlan_proc_rem_dev(dev);
415 break;
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700416 }
417}
418
Patrick McHardy2029cc22008-01-21 00:26:41 -0800419static int vlan_device_event(struct notifier_block *unused, unsigned long event,
420 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
422 struct net_device *dev = ptr;
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700423 struct vlan_group *grp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 int i, flgs;
425 struct net_device *vlandev;
426
Patrick McHardy81d85342008-05-20 14:37:36 -0700427 if (is_vlan_dev(dev))
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700428 __vlan_device_event(dev, event);
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700429
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700430 grp = __vlan_find_group(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (!grp)
432 goto out;
433
434 /* It is OK that we do not hold the group lock right now,
435 * as we run under the RTNL lock.
436 */
437
438 switch (event) {
439 case NETDEV_CHANGE:
440 /* Propagate real device state to vlan devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800442 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 if (!vlandev)
444 continue;
445
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800446 vlan_transfer_operstate(dev, vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 }
448 break;
449
Patrick McHardy8c979c22007-07-11 19:45:24 -0700450 case NETDEV_CHANGEADDR:
451 /* Adjust unicast filters on underlying device */
452 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
453 vlandev = vlan_group_get_device(grp, i);
454 if (!vlandev)
455 continue;
456
Patrick McHardyd932e042007-11-10 21:51:40 -0800457 flgs = vlandev->flags;
458 if (!(flgs & IFF_UP))
459 continue;
460
Patrick McHardy8c979c22007-07-11 19:45:24 -0700461 vlan_sync_address(dev, vlandev);
462 }
463 break;
464
Patrick McHardy5fb13572008-05-20 14:54:50 -0700465 case NETDEV_FEAT_CHANGE:
466 /* Propagate device features to underlying device */
467 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
468 vlandev = vlan_group_get_device(grp, i);
469 if (!vlandev)
470 continue;
471
472 vlan_transfer_features(dev, vlandev);
473 }
474
475 break;
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 case NETDEV_DOWN:
478 /* Put all VLANs for this dev in the down state too. */
479 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800480 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 if (!vlandev)
482 continue;
483
484 flgs = vlandev->flags;
485 if (!(flgs & IFF_UP))
486 continue;
487
488 dev_change_flags(vlandev, flgs & ~IFF_UP);
489 }
490 break;
491
492 case NETDEV_UP:
493 /* Put all VLANs for this dev in the up state too. */
494 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800495 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (!vlandev)
497 continue;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 flgs = vlandev->flags;
500 if (flgs & IFF_UP)
501 continue;
502
503 dev_change_flags(vlandev, flgs | IFF_UP);
504 }
505 break;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 case NETDEV_UNREGISTER:
508 /* Delete all VLANs for this dev. */
509 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800510 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 if (!vlandev)
512 continue;
513
Patrick McHardyaf301512008-01-21 00:25:50 -0800514 /* unregistration of last vlan destroys group, abort
515 * afterwards */
516 if (grp->nr_vlans == 1)
517 i = VLAN_GROUP_ARRAY_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
Patrick McHardyaf301512008-01-21 00:25:50 -0800519 unregister_vlan_dev(vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 }
521 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700522 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524out:
525 return NOTIFY_DONE;
526}
527
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800528static struct notifier_block vlan_notifier_block __read_mostly = {
529 .notifier_call = vlan_device_event,
530};
531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532/*
533 * VLAN IOCTL handler.
534 * o execute requested action or pass command to the device driver
535 * arg is really a struct vlan_ioctl_args __user *.
536 */
Eric W. Biederman881d9662007-09-17 11:56:21 -0700537static int vlan_ioctl_handler(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
Patrick McHardyc17d8872007-06-13 12:05:22 -0700539 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 struct vlan_ioctl_args args;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700541 struct net_device *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
544 return -EFAULT;
545
546 /* Null terminate this sucker, just in case. */
547 args.device1[23] = 0;
548 args.u.device2[23] = 0;
549
Patrick McHardyc17d8872007-06-13 12:05:22 -0700550 rtnl_lock();
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 switch (args.cmd) {
553 case SET_VLAN_INGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700554 case SET_VLAN_EGRESS_PRIORITY_CMD:
555 case SET_VLAN_FLAG_CMD:
556 case ADD_VLAN_CMD:
557 case DEL_VLAN_CMD:
558 case GET_VLAN_REALDEV_NAME_CMD:
559 case GET_VLAN_VID_CMD:
560 err = -ENODEV;
Pavel Emelyanov65d292a2008-04-16 00:55:06 -0700561 dev = __dev_get_by_name(net, args.device1);
Patrick McHardyc17d8872007-06-13 12:05:22 -0700562 if (!dev)
563 goto out;
564
565 err = -EINVAL;
Joonwoo Park26a25232008-07-08 03:22:16 -0700566 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700567 goto out;
568 }
569
570 switch (args.cmd) {
571 case SET_VLAN_INGRESS_PRIORITY_CMD:
572 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700574 break;
575 vlan_dev_set_ingress_priority(dev,
576 args.u.skb_priority,
577 args.vlan_qos);
Patrick McHardyfffe4702007-11-07 01:31:32 -0800578 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 break;
580
581 case SET_VLAN_EGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700582 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700584 break;
585 err = vlan_dev_set_egress_priority(dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 args.u.skb_priority,
587 args.vlan_qos);
588 break;
589
590 case SET_VLAN_FLAG_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700591 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700593 break;
Patrick McHardyb3ce0322008-07-05 21:26:27 -0700594 err = vlan_dev_change_flags(dev,
595 args.vlan_qos ? args.u.flag : 0,
596 args.u.flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 break;
598
599 case SET_VLAN_NAME_TYPE_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700600 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 if (!capable(CAP_NET_ADMIN))
Pavel Emelyanove35de022007-12-06 22:52:16 -0800602 break;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700603 if ((args.u.name_type >= 0) &&
604 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700605 struct vlan_net *vn;
606
607 vn = net_generic(net, vlan_net_id);
608 vn->name_type = args.u.name_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 err = 0;
610 } else {
611 err = -EINVAL;
612 }
613 break;
614
615 case ADD_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700616 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700618 break;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700619 err = register_vlan_device(dev, args.u.VID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 break;
621
622 case DEL_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700623 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700625 break;
Patrick McHardyaf301512008-01-21 00:25:50 -0800626 unregister_vlan_dev(dev);
627 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 break;
629
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 case GET_VLAN_REALDEV_NAME_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700631 err = 0;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700632 vlan_dev_get_realdev_name(dev, args.u.device2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 if (copy_to_user(arg, &args,
Patrick McHardy2029cc22008-01-21 00:26:41 -0800634 sizeof(struct vlan_ioctl_args)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 break;
637
638 case GET_VLAN_VID_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700639 err = 0;
Patrick McHardy22d1ba72008-07-08 03:23:57 -0700640 args.u.VID = vlan_dev_vlan_id(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 if (copy_to_user(arg, &args,
Patrick McHardy2029cc22008-01-21 00:26:41 -0800642 sizeof(struct vlan_ioctl_args)))
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900643 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 break;
645
646 default:
Patrick McHardy198a2912008-01-21 00:24:59 -0800647 err = -EOPNOTSUPP;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700648 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700649 }
Mika Kukkonen7eb1b3d2005-12-21 18:39:49 -0800650out:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700651 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 return err;
653}
654
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700655static int vlan_init_net(struct net *net)
656{
657 int err;
658 struct vlan_net *vn;
659
660 err = -ENOMEM;
661 vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
662 if (vn == NULL)
663 goto err_alloc;
664
665 err = net_assign_generic(net, vlan_net_id, vn);
666 if (err < 0)
667 goto err_assign;
668
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700669 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
670
Pavel Emelyanovcd1c7012008-04-16 00:51:12 -0700671 err = vlan_proc_init(net);
672 if (err < 0)
673 goto err_proc;
674
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700675 return 0;
676
Pavel Emelyanovcd1c7012008-04-16 00:51:12 -0700677err_proc:
678 /* nothing */
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700679err_assign:
680 kfree(vn);
681err_alloc:
682 return err;
683}
684
685static void vlan_exit_net(struct net *net)
686{
687 struct vlan_net *vn;
688
689 vn = net_generic(net, vlan_net_id);
Pavel Emelyanov65d292a2008-04-16 00:55:06 -0700690 rtnl_kill_links(net, &vlan_link_ops);
Pavel Emelyanovcd1c7012008-04-16 00:51:12 -0700691 vlan_proc_cleanup(net);
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700692 kfree(vn);
693}
694
695static struct pernet_operations vlan_net_ops = {
696 .init = vlan_init_net,
697 .exit = vlan_exit_net,
698};
699
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800700static int __init vlan_proto_init(void)
701{
702 int err;
703
704 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
705 pr_info("All bugs added by %s\n", vlan_buggyright);
706
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700707 err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
708 if (err < 0)
709 goto err0;
710
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800711 err = register_netdevice_notifier(&vlan_notifier_block);
712 if (err < 0)
713 goto err2;
714
Patrick McHardy70c03b42008-07-05 21:26:57 -0700715 err = vlan_gvrp_init();
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800716 if (err < 0)
717 goto err3;
718
Patrick McHardy70c03b42008-07-05 21:26:57 -0700719 err = vlan_netlink_init();
720 if (err < 0)
721 goto err4;
722
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800723 dev_add_pack(&vlan_packet_type);
724 vlan_ioctl_set(vlan_ioctl_handler);
725 return 0;
726
Patrick McHardy70c03b42008-07-05 21:26:57 -0700727err4:
728 vlan_gvrp_uninit();
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800729err3:
730 unregister_netdevice_notifier(&vlan_notifier_block);
731err2:
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700732 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
733err0:
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800734 return err;
735}
736
737static void __exit vlan_cleanup_module(void)
738{
739 unsigned int i;
740
741 vlan_ioctl_set(NULL);
742 vlan_netlink_fini();
743
744 unregister_netdevice_notifier(&vlan_notifier_block);
745
746 dev_remove_pack(&vlan_packet_type);
747
748 /* This table must be empty if there are no module references left. */
749 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
750 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
751
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700752 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800753 synchronize_net();
Patrick McHardy70c03b42008-07-05 21:26:57 -0700754
755 vlan_gvrp_uninit();
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800756}
757
758module_init(vlan_proto_init);
759module_exit(vlan_cleanup_module);
760
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761MODULE_LICENSE("GPL");
762MODULE_VERSION(DRV_VERSION);