blob: d1e10546eb85d824b8f06e499358634bc9c2288b [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>
Franck Bui-Huu82524742008-05-12 21:21:05 +020026#include <linux/rculist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <net/p8022.h>
28#include <net/arp.h>
29#include <linux/rtnetlink.h>
30#include <linux/notifier.h>
Patrick McHardy61362762008-07-14 22:51:55 -070031#include <net/rtnetlink.h>
Eric W. Biedermane9dc8652007-09-12 13:02:17 +020032#include <net/net_namespace.h>
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -070033#include <net/netns/generic.h>
Patrick McHardy61362762008-07-14 22:51:55 -070034#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <linux/if_vlan.h>
37#include "vlan.h"
38#include "vlanproc.h"
39
40#define DRV_VERSION "1.8"
41
42/* Global VLAN variables */
43
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -070044int vlan_net_id;
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046/* Our listing of VLAN group(s) */
47static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Stephen Hemmingerb30200612008-10-28 22:12:36 -070049const char vlan_fullname[] = "802.1Q VLAN Support";
50const char vlan_version[] = DRV_VERSION;
51static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
52static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Stephen Hemminger7546dd92009-03-09 08:18:29 +000054static struct packet_type vlan_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -080055 .type = cpu_to_be16(ETH_P_8021Q),
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 .func = vlan_skb_recv, /* VLAN receive method */
57};
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059/* End of global variables definitions. */
60
Patrick McHardy2029cc22008-01-21 00:26:41 -080061static inline unsigned int vlan_grp_hashfn(unsigned int idx)
62{
63 return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
64}
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066/* Must be invoked with RCU read lock (no preempt) */
Pavel Emelyanova9fde262008-04-16 00:48:04 -070067static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
69 struct vlan_group *grp;
70 struct hlist_node *n;
Pavel Emelyanova9fde262008-04-16 00:48:04 -070071 int hash = vlan_grp_hashfn(real_dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73 hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
Pavel Emelyanova9fde262008-04-16 00:48:04 -070074 if (grp->real_dev == real_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 return grp;
76 }
77
78 return NULL;
79}
80
81/* Find the protocol handler. Assumes VID < VLAN_VID_MASK.
82 *
83 * Must be invoked with RCU read lock (no preempt)
84 */
Patrick McHardy9bb85822008-07-08 03:24:44 -070085struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Pavel Emelyanova9fde262008-04-16 00:48:04 -070087 struct vlan_group *grp = __vlan_find_group(real_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89 if (grp)
Patrick McHardy9bb85822008-07-08 03:24:44 -070090 return vlan_group_get_device(grp, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92 return NULL;
93}
94
Dan Aloni5c15bde2007-03-02 20:44:51 -080095static void vlan_group_free(struct vlan_group *grp)
96{
97 int i;
98
Patrick McHardy2029cc22008-01-21 00:26:41 -080099 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
Dan Aloni5c15bde2007-03-02 20:44:51 -0800100 kfree(grp->vlan_devices_arrays[i]);
101 kfree(grp);
102}
103
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700104static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
Patrick McHardy42429aa2007-06-13 12:05:59 -0700105{
106 struct vlan_group *grp;
Patrick McHardy42429aa2007-06-13 12:05:59 -0700107
108 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
109 if (!grp)
110 return NULL;
111
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700112 grp->real_dev = real_dev;
Patrick McHardy42429aa2007-06-13 12:05:59 -0700113 hlist_add_head_rcu(&grp->hlist,
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700114 &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
Patrick McHardy42429aa2007-06-13 12:05:59 -0700115 return grp;
Pavel Emelyanov67727182008-03-26 16:27:22 -0700116}
Patrick McHardy42429aa2007-06-13 12:05:59 -0700117
Patrick McHardy9bb85822008-07-08 03:24:44 -0700118static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
Pavel Emelyanov67727182008-03-26 16:27:22 -0700119{
120 struct net_device **array;
121 unsigned int size;
122
123 ASSERT_RTNL();
124
Patrick McHardy9bb85822008-07-08 03:24:44 -0700125 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
Pavel Emelyanov67727182008-03-26 16:27:22 -0700126 if (array != NULL)
127 return 0;
128
129 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
130 array = kzalloc(size, GFP_KERNEL);
131 if (array == NULL)
132 return -ENOBUFS;
133
Patrick McHardy9bb85822008-07-08 03:24:44 -0700134 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
Pavel Emelyanov67727182008-03-26 16:27:22 -0700135 return 0;
Patrick McHardy42429aa2007-06-13 12:05:59 -0700136}
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138static void vlan_rcu_free(struct rcu_head *rcu)
139{
Dan Aloni5c15bde2007-03-02 20:44:51 -0800140 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141}
142
Patrick McHardyaf301512008-01-21 00:25:50 -0800143void unregister_vlan_dev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800145 struct vlan_dev_info *vlan = vlan_dev_info(dev);
Patrick McHardyaf301512008-01-21 00:25:50 -0800146 struct net_device *real_dev = vlan->real_dev;
Stephen Hemminger656299f2008-11-19 21:53:47 -0800147 const struct net_device_ops *ops = real_dev->netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 struct vlan_group *grp;
Patrick McHardy9bb85822008-07-08 03:24:44 -0700149 u16 vlan_id = vlan->vlan_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 ASSERT_RTNL();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700153 grp = __vlan_find_group(real_dev);
Patrick McHardyaf301512008-01-21 00:25:50 -0800154 BUG_ON(!grp);
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800155
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800156 /* Take it out of our own structures, but be sure to interlock with
157 * HW accelerating devices or SW vlan input packet processing.
158 */
159 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
Stephen Hemminger656299f2008-11-19 21:53:47 -0800160 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800161
162 vlan_group_set_device(grp, vlan_id, NULL);
Patrick McHardyaf301512008-01-21 00:25:50 -0800163 grp->nr_vlans--;
164
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800165 synchronize_net();
166
Patrick McHardyce305002008-07-05 21:26:41 -0700167 unregister_netdevice(dev);
168
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800169 /* If the group is now empty, kill off the group. */
Patrick McHardyaf301512008-01-21 00:25:50 -0800170 if (grp->nr_vlans == 0) {
Patrick McHardy70c03b42008-07-05 21:26:57 -0700171 vlan_gvrp_uninit_applicant(real_dev);
172
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800173 if (real_dev->features & NETIF_F_HW_VLAN_RX)
Stephen Hemminger656299f2008-11-19 21:53:47 -0800174 ops->ndo_vlan_rx_register(real_dev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800176 hlist_del_rcu(&grp->hlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800178 /* Free the group, after all cpu's are done. */
179 call_rcu(&grp->rcu, vlan_rcu_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
181
Patrick McHardyaf301512008-01-21 00:25:50 -0800182 /* Get rid of the vlan's reference to real_dev */
183 dev_put(real_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
Patrick McHardy2029cc22008-01-21 00:26:41 -0800186static void vlan_transfer_operstate(const struct net_device *dev,
187 struct net_device *vlandev)
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800188{
189 /* Have to respect userspace enforced dormant state
190 * of real device, also must allow supplicant running
191 * on VLAN device
192 */
193 if (dev->operstate == IF_OPER_DORMANT)
194 netif_dormant_on(vlandev);
195 else
196 netif_dormant_off(vlandev);
197
198 if (netif_carrier_ok(dev)) {
199 if (!netif_carrier_ok(vlandev))
200 netif_carrier_on(vlandev);
201 } else {
202 if (netif_carrier_ok(vlandev))
203 netif_carrier_off(vlandev);
204 }
205}
206
Patrick McHardy9bb85822008-07-08 03:24:44 -0700207int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700208{
Stephen Hemminger656299f2008-11-19 21:53:47 -0800209 const char *name = real_dev->name;
210 const struct net_device_ops *ops = real_dev->netdev_ops;
Patrick McHardy40f98e12008-01-21 00:24:30 -0800211
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700212 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800213 pr_info("8021q: VLANs not supported on %s\n", name);
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700214 return -EOPNOTSUPP;
215 }
216
Stephen Hemminger656299f2008-11-19 21:53:47 -0800217 if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800218 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700219 return -EOPNOTSUPP;
220 }
221
222 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
Stephen Hemminger656299f2008-11-19 21:53:47 -0800223 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800224 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700225 return -EOPNOTSUPP;
226 }
227
228 /* The real device must be up and operating in order to
229 * assosciate a VLAN device with it.
230 */
231 if (!(real_dev->flags & IFF_UP))
232 return -ENETDOWN;
233
Patrick McHardy40f98e12008-01-21 00:24:30 -0800234 if (__find_vlan_dev(real_dev, vlan_id) != NULL)
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700235 return -EEXIST;
Patrick McHardyc1d3ee92007-06-13 12:06:14 -0700236
237 return 0;
238}
239
Patrick McHardy07b5b172007-06-13 12:07:54 -0700240int register_vlan_dev(struct net_device *dev)
Patrick McHardye89fe422007-06-13 12:06:29 -0700241{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800242 struct vlan_dev_info *vlan = vlan_dev_info(dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700243 struct net_device *real_dev = vlan->real_dev;
Stephen Hemminger656299f2008-11-19 21:53:47 -0800244 const struct net_device_ops *ops = real_dev->netdev_ops;
Patrick McHardy9bb85822008-07-08 03:24:44 -0700245 u16 vlan_id = vlan->vlan_id;
Patrick McHardye89fe422007-06-13 12:06:29 -0700246 struct vlan_group *grp, *ngrp = NULL;
247 int err;
248
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700249 grp = __vlan_find_group(real_dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700250 if (!grp) {
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700251 ngrp = grp = vlan_group_alloc(real_dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700252 if (!grp)
253 return -ENOBUFS;
Patrick McHardy70c03b42008-07-05 21:26:57 -0700254 err = vlan_gvrp_init_applicant(real_dev);
255 if (err < 0)
256 goto out_free_group;
Patrick McHardye89fe422007-06-13 12:06:29 -0700257 }
258
Pavel Emelyanov67727182008-03-26 16:27:22 -0700259 err = vlan_group_prealloc_vid(grp, vlan_id);
260 if (err < 0)
Patrick McHardy70c03b42008-07-05 21:26:57 -0700261 goto out_uninit_applicant;
Pavel Emelyanov67727182008-03-26 16:27:22 -0700262
Patrick McHardye89fe422007-06-13 12:06:29 -0700263 err = register_netdevice(dev);
264 if (err < 0)
Patrick McHardy70c03b42008-07-05 21:26:57 -0700265 goto out_uninit_applicant;
Patrick McHardye89fe422007-06-13 12:06:29 -0700266
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);
Patrick McHardyaf301512008-01-21 00:25:50 -0800277 grp->nr_vlans++;
278
Patrick McHardye89fe422007-06-13 12:06:29 -0700279 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
Stephen Hemminger656299f2008-11-19 21:53:47 -0800280 ops->ndo_vlan_rx_register(real_dev, ngrp);
Patrick McHardye89fe422007-06-13 12:06:29 -0700281 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
Stephen Hemminger656299f2008-11-19 21:53:47 -0800282 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
Patrick McHardye89fe422007-06-13 12:06:29 -0700283
Patrick McHardye89fe422007-06-13 12:06:29 -0700284 return 0;
285
Patrick McHardy70c03b42008-07-05 21:26:57 -0700286out_uninit_applicant:
287 if (ngrp)
288 vlan_gvrp_uninit_applicant(real_dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700289out_free_group:
290 if (ngrp)
291 vlan_group_free(ngrp);
292 return err;
293}
294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295/* Attach a VLAN device to a mac address (ie Ethernet Card).
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700296 * Returns 0 if the device was created or a negative error code otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700298static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 struct net_device *new_dev;
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700301 struct net *net = dev_net(real_dev);
302 struct vlan_net *vn = net_generic(net, vlan_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 char name[IFNAMSIZ];
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700304 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Patrick McHardy9bb85822008-07-08 03:24:44 -0700306 if (vlan_id >= VLAN_VID_MASK)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700307 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Patrick McHardy9bb85822008-07-08 03:24:44 -0700309 err = vlan_check_real_dev(real_dev, vlan_id);
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700310 if (err < 0)
311 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
313 /* Gotta set up the fields for the device. */
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700314 switch (vn->name_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 case VLAN_NAME_TYPE_RAW_PLUS_VID:
316 /* name will look like: eth1.0005 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700317 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 break;
319 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
320 /* Put our vlan.VID in the name.
321 * Name will look like: vlan5
322 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700323 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 break;
325 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
326 /* Put our vlan.VID in the name.
327 * Name will look like: eth0.5
328 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700329 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 break;
331 case VLAN_NAME_TYPE_PLUS_VID:
332 /* Put our vlan.VID in the name.
333 * Name will look like: vlan0005
334 */
335 default:
Patrick McHardy9bb85822008-07-08 03:24:44 -0700336 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700337 }
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
340 vlan_setup);
Arjan van de Ven5dd8d1e2006-07-03 00:25:33 -0700341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 if (new_dev == NULL)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700343 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Pavel Emelyanov65d292a2008-04-16 00:55:06 -0700345 dev_net_set(new_dev, net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 /* need 4 bytes for extra VLAN header info,
347 * hope the underlying device can handle it.
348 */
349 new_dev->mtu = real_dev->mtu;
350
Patrick McHardy9bb85822008-07-08 03:24:44 -0700351 vlan_dev_info(new_dev)->vlan_id = vlan_id;
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800352 vlan_dev_info(new_dev)->real_dev = real_dev;
353 vlan_dev_info(new_dev)->dent = NULL;
354 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Patrick McHardy07b5b172007-06-13 12:07:54 -0700356 new_dev->rtnl_link_ops = &vlan_link_ops;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700357 err = register_vlan_dev(new_dev);
358 if (err < 0)
Patrick McHardye89fe422007-06-13 12:06:29 -0700359 goto out_free_newdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700361 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363out_free_newdev:
364 free_netdev(new_dev);
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700365 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366}
367
Patrick McHardy8c979c22007-07-11 19:45:24 -0700368static void vlan_sync_address(struct net_device *dev,
369 struct net_device *vlandev)
370{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800371 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
Patrick McHardy8c979c22007-07-11 19:45:24 -0700372
373 /* May be called without an actual change */
374 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
375 return;
376
377 /* vlan address was different from the old address and is equal to
378 * the new address */
379 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
380 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
381 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
382
383 /* vlan address was equal to the old address and is different from
384 * the new address */
385 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
386 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
387 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
388
389 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
390}
391
Patrick McHardy5fb13572008-05-20 14:54:50 -0700392static void vlan_transfer_features(struct net_device *dev,
393 struct net_device *vlandev)
394{
395 unsigned long old_features = vlandev->features;
396
Patrick McHardy289c79a2008-05-23 00:22:04 -0700397 vlandev->features &= ~dev->vlan_features;
398 vlandev->features |= dev->features & dev->vlan_features;
Alexander Duyck1ae4be22008-09-11 20:17:05 -0700399 vlandev->gso_max_size = dev->gso_max_size;
Patrick McHardy5fb13572008-05-20 14:54:50 -0700400
401 if (old_features != vlandev->features)
402 netdev_features_change(vlandev);
403}
404
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700405static void __vlan_device_event(struct net_device *dev, unsigned long event)
406{
407 switch (event) {
408 case NETDEV_CHANGENAME:
409 vlan_proc_rem_dev(dev);
410 if (vlan_proc_add_dev(dev) < 0)
411 pr_warning("8021q: failed to change proc name for %s\n",
412 dev->name);
413 break;
Pavel Emelyanov30688a92008-04-16 00:57:01 -0700414 case NETDEV_REGISTER:
415 if (vlan_proc_add_dev(dev) < 0)
416 pr_warning("8021q: failed to add proc entry for %s\n",
417 dev->name);
418 break;
419 case NETDEV_UNREGISTER:
420 vlan_proc_rem_dev(dev);
421 break;
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700422 }
423}
424
Patrick McHardy2029cc22008-01-21 00:26:41 -0800425static int vlan_device_event(struct notifier_block *unused, unsigned long event,
426 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427{
428 struct net_device *dev = ptr;
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700429 struct vlan_group *grp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 int i, flgs;
431 struct net_device *vlandev;
432
Patrick McHardy81d85342008-05-20 14:37:36 -0700433 if (is_vlan_dev(dev))
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700434 __vlan_device_event(dev, event);
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700435
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700436 grp = __vlan_find_group(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 if (!grp)
438 goto out;
439
440 /* It is OK that we do not hold the group lock right now,
441 * as we run under the RTNL lock.
442 */
443
444 switch (event) {
445 case NETDEV_CHANGE:
446 /* Propagate real device state to vlan devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800448 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 if (!vlandev)
450 continue;
451
Stefan Rompfddd7bf92006-03-20 17:11:41 -0800452 vlan_transfer_operstate(dev, vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 }
454 break;
455
Patrick McHardy8c979c22007-07-11 19:45:24 -0700456 case NETDEV_CHANGEADDR:
457 /* Adjust unicast filters on underlying device */
458 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
459 vlandev = vlan_group_get_device(grp, i);
460 if (!vlandev)
461 continue;
462
Patrick McHardyd932e042007-11-10 21:51:40 -0800463 flgs = vlandev->flags;
464 if (!(flgs & IFF_UP))
465 continue;
466
Patrick McHardy8c979c22007-07-11 19:45:24 -0700467 vlan_sync_address(dev, vlandev);
468 }
469 break;
470
Patrick McHardy5fb13572008-05-20 14:54:50 -0700471 case NETDEV_FEAT_CHANGE:
472 /* Propagate device features to underlying device */
473 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
474 vlandev = vlan_group_get_device(grp, i);
475 if (!vlandev)
476 continue;
477
478 vlan_transfer_features(dev, vlandev);
479 }
480
481 break;
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 case NETDEV_DOWN:
484 /* Put all VLANs for this dev in the down state too. */
485 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800486 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (!vlandev)
488 continue;
489
490 flgs = vlandev->flags;
491 if (!(flgs & IFF_UP))
492 continue;
493
494 dev_change_flags(vlandev, flgs & ~IFF_UP);
Jay Vosburghadc667e2009-04-25 18:03:35 -0700495 vlan_transfer_operstate(dev, vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 }
497 break;
498
499 case NETDEV_UP:
500 /* Put all VLANs for this dev in the up state too. */
501 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800502 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 if (!vlandev)
504 continue;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 flgs = vlandev->flags;
507 if (flgs & IFF_UP)
508 continue;
509
510 dev_change_flags(vlandev, flgs | IFF_UP);
Jay Vosburghadc667e2009-04-25 18:03:35 -0700511 vlan_transfer_operstate(dev, vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 }
513 break;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900514
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 case NETDEV_UNREGISTER:
516 /* Delete all VLANs for this dev. */
517 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800518 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 if (!vlandev)
520 continue;
521
Patrick McHardyaf301512008-01-21 00:25:50 -0800522 /* unregistration of last vlan destroys group, abort
523 * afterwards */
524 if (grp->nr_vlans == 1)
525 i = VLAN_GROUP_ARRAY_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
Patrick McHardyaf301512008-01-21 00:25:50 -0800527 unregister_vlan_dev(vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 }
529 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700530 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532out:
533 return NOTIFY_DONE;
534}
535
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800536static struct notifier_block vlan_notifier_block __read_mostly = {
537 .notifier_call = vlan_device_event,
538};
539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540/*
541 * VLAN IOCTL handler.
542 * o execute requested action or pass command to the device driver
543 * arg is really a struct vlan_ioctl_args __user *.
544 */
Eric W. Biederman881d9662007-09-17 11:56:21 -0700545static int vlan_ioctl_handler(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
Patrick McHardyc17d8872007-06-13 12:05:22 -0700547 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 struct vlan_ioctl_args args;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700549 struct net_device *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
552 return -EFAULT;
553
554 /* Null terminate this sucker, just in case. */
555 args.device1[23] = 0;
556 args.u.device2[23] = 0;
557
Patrick McHardyc17d8872007-06-13 12:05:22 -0700558 rtnl_lock();
559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 switch (args.cmd) {
561 case SET_VLAN_INGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700562 case SET_VLAN_EGRESS_PRIORITY_CMD:
563 case SET_VLAN_FLAG_CMD:
564 case ADD_VLAN_CMD:
565 case DEL_VLAN_CMD:
566 case GET_VLAN_REALDEV_NAME_CMD:
567 case GET_VLAN_VID_CMD:
568 err = -ENODEV;
Pavel Emelyanov65d292a2008-04-16 00:55:06 -0700569 dev = __dev_get_by_name(net, args.device1);
Patrick McHardyc17d8872007-06-13 12:05:22 -0700570 if (!dev)
571 goto out;
572
573 err = -EINVAL;
Joonwoo Park26a25232008-07-08 03:22:16 -0700574 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700575 goto out;
576 }
577
578 switch (args.cmd) {
579 case SET_VLAN_INGRESS_PRIORITY_CMD:
580 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700582 break;
583 vlan_dev_set_ingress_priority(dev,
584 args.u.skb_priority,
585 args.vlan_qos);
Patrick McHardyfffe4702007-11-07 01:31:32 -0800586 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 break;
588
589 case SET_VLAN_EGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700590 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700592 break;
593 err = vlan_dev_set_egress_priority(dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 args.u.skb_priority,
595 args.vlan_qos);
596 break;
597
598 case SET_VLAN_FLAG_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700599 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700601 break;
Patrick McHardyb3ce0322008-07-05 21:26:27 -0700602 err = vlan_dev_change_flags(dev,
603 args.vlan_qos ? args.u.flag : 0,
604 args.u.flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 break;
606
607 case SET_VLAN_NAME_TYPE_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700608 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if (!capable(CAP_NET_ADMIN))
Pavel Emelyanove35de022007-12-06 22:52:16 -0800610 break;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700611 if ((args.u.name_type >= 0) &&
612 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700613 struct vlan_net *vn;
614
615 vn = net_generic(net, vlan_net_id);
616 vn->name_type = args.u.name_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 err = 0;
618 } else {
619 err = -EINVAL;
620 }
621 break;
622
623 case ADD_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700624 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700626 break;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700627 err = register_vlan_device(dev, args.u.VID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 break;
629
630 case DEL_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700631 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700633 break;
Patrick McHardyaf301512008-01-21 00:25:50 -0800634 unregister_vlan_dev(dev);
635 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 break;
637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 case GET_VLAN_REALDEV_NAME_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700639 err = 0;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700640 vlan_dev_get_realdev_name(dev, args.u.device2);
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)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 break;
645
646 case GET_VLAN_VID_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700647 err = 0;
Patrick McHardy22d1ba72008-07-08 03:23:57 -0700648 args.u.VID = vlan_dev_vlan_id(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 if (copy_to_user(arg, &args,
Patrick McHardy2029cc22008-01-21 00:26:41 -0800650 sizeof(struct vlan_ioctl_args)))
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900651 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 break;
653
654 default:
Patrick McHardy198a2912008-01-21 00:24:59 -0800655 err = -EOPNOTSUPP;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700656 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700657 }
Mika Kukkonen7eb1b3d2005-12-21 18:39:49 -0800658out:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700659 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 return err;
661}
662
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700663static int vlan_init_net(struct net *net)
664{
665 int err;
666 struct vlan_net *vn;
667
668 err = -ENOMEM;
669 vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
670 if (vn == NULL)
671 goto err_alloc;
672
673 err = net_assign_generic(net, vlan_net_id, vn);
674 if (err < 0)
675 goto err_assign;
676
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700677 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
678
Pavel Emelyanovcd1c7012008-04-16 00:51:12 -0700679 err = vlan_proc_init(net);
680 if (err < 0)
681 goto err_proc;
682
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700683 return 0;
684
Pavel Emelyanovcd1c7012008-04-16 00:51:12 -0700685err_proc:
686 /* nothing */
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700687err_assign:
688 kfree(vn);
689err_alloc:
690 return err;
691}
692
693static void vlan_exit_net(struct net *net)
694{
695 struct vlan_net *vn;
696
697 vn = net_generic(net, vlan_net_id);
Pavel Emelyanov65d292a2008-04-16 00:55:06 -0700698 rtnl_kill_links(net, &vlan_link_ops);
Pavel Emelyanovcd1c7012008-04-16 00:51:12 -0700699 vlan_proc_cleanup(net);
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700700 kfree(vn);
701}
702
703static struct pernet_operations vlan_net_ops = {
704 .init = vlan_init_net,
705 .exit = vlan_exit_net,
706};
707
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800708static int __init vlan_proto_init(void)
709{
710 int err;
711
712 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
713 pr_info("All bugs added by %s\n", vlan_buggyright);
714
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700715 err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
716 if (err < 0)
717 goto err0;
718
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800719 err = register_netdevice_notifier(&vlan_notifier_block);
720 if (err < 0)
721 goto err2;
722
Patrick McHardy70c03b42008-07-05 21:26:57 -0700723 err = vlan_gvrp_init();
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800724 if (err < 0)
725 goto err3;
726
Patrick McHardy70c03b42008-07-05 21:26:57 -0700727 err = vlan_netlink_init();
728 if (err < 0)
729 goto err4;
730
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800731 dev_add_pack(&vlan_packet_type);
732 vlan_ioctl_set(vlan_ioctl_handler);
733 return 0;
734
Patrick McHardy70c03b42008-07-05 21:26:57 -0700735err4:
736 vlan_gvrp_uninit();
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800737err3:
738 unregister_netdevice_notifier(&vlan_notifier_block);
739err2:
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700740 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
741err0:
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800742 return err;
743}
744
745static void __exit vlan_cleanup_module(void)
746{
747 unsigned int i;
748
749 vlan_ioctl_set(NULL);
750 vlan_netlink_fini();
751
752 unregister_netdevice_notifier(&vlan_notifier_block);
753
754 dev_remove_pack(&vlan_packet_type);
755
756 /* This table must be empty if there are no module references left. */
757 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
758 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
759
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700760 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800761 synchronize_net();
Patrick McHardy70c03b42008-07-05 21:26:57 -0700762
763 vlan_gvrp_uninit();
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800764}
765
766module_init(vlan_proto_init);
767module_exit(vlan_cleanup_module);
768
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769MODULE_LICENSE("GPL");
770MODULE_VERSION(DRV_VERSION);