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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
Eric Dumazetf99189b2009-11-17 10:42:49 +000044int vlan_net_id __read_mostly;
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -070045
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 Harrison09640e632009-02-01 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
Eric Dumazet23289a32009-10-27 07:06:36 +0000143void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
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
Patrick McHardyaf301512008-01-21 00:25:50 -0800162 grp->nr_vlans--;
163
Patrick McHardy29906f62009-10-29 23:43:00 -0700164 vlan_group_set_device(grp, vlan_id, NULL);
165 if (!grp->killall)
Eric Dumazet63c80992009-10-27 07:06:49 +0000166 synchronize_net();
Patrick McHardy29906f62009-10-29 23:43:00 -0700167
Eric Dumazet23289a32009-10-27 07:06:36 +0000168 unregister_netdevice_queue(dev, head);
Patrick McHardyce305002008-07-05 21:26:41 -0700169
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800170 /* If the group is now empty, kill off the group. */
Patrick McHardyaf301512008-01-21 00:25:50 -0800171 if (grp->nr_vlans == 0) {
Patrick McHardy70c03b42008-07-05 21:26:57 -0700172 vlan_gvrp_uninit_applicant(real_dev);
173
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800174 if (real_dev->features & NETIF_F_HW_VLAN_RX)
Stephen Hemminger656299f2008-11-19 21:53:47 -0800175 ops->ndo_vlan_rx_register(real_dev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800177 hlist_del_rcu(&grp->hlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Patrick McHardyacc5efb2008-01-21 00:25:31 -0800179 /* Free the group, after all cpu's are done. */
180 call_rcu(&grp->rcu, vlan_rcu_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 }
182
Patrick McHardyaf301512008-01-21 00:25:50 -0800183 /* Get rid of the vlan's reference to real_dev */
184 dev_put(real_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
Patrick McHardy9bb85822008-07-08 03:24:44 -0700187int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
Patrick McHardyc1d3ee992007-06-13 12:06:14 -0700188{
Stephen Hemminger656299f2008-11-19 21:53:47 -0800189 const char *name = real_dev->name;
190 const struct net_device_ops *ops = real_dev->netdev_ops;
Patrick McHardy40f98e12008-01-21 00:24:30 -0800191
Patrick McHardyc1d3ee992007-06-13 12:06:14 -0700192 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800193 pr_info("8021q: VLANs not supported on %s\n", name);
Patrick McHardyc1d3ee992007-06-13 12:06:14 -0700194 return -EOPNOTSUPP;
195 }
196
Stephen Hemminger656299f2008-11-19 21:53:47 -0800197 if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800198 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
Patrick McHardyc1d3ee992007-06-13 12:06:14 -0700199 return -EOPNOTSUPP;
200 }
201
202 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
Stephen Hemminger656299f2008-11-19 21:53:47 -0800203 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
Patrick McHardy40f98e12008-01-21 00:24:30 -0800204 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
Patrick McHardyc1d3ee992007-06-13 12:06:14 -0700205 return -EOPNOTSUPP;
206 }
207
Patrick McHardy40f98e12008-01-21 00:24:30 -0800208 if (__find_vlan_dev(real_dev, vlan_id) != NULL)
Patrick McHardyc1d3ee992007-06-13 12:06:14 -0700209 return -EEXIST;
Patrick McHardyc1d3ee992007-06-13 12:06:14 -0700210
211 return 0;
212}
213
Patrick McHardy07b5b172007-06-13 12:07:54 -0700214int register_vlan_dev(struct net_device *dev)
Patrick McHardye89fe422007-06-13 12:06:29 -0700215{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800216 struct vlan_dev_info *vlan = vlan_dev_info(dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700217 struct net_device *real_dev = vlan->real_dev;
Stephen Hemminger656299f2008-11-19 21:53:47 -0800218 const struct net_device_ops *ops = real_dev->netdev_ops;
Patrick McHardy9bb85822008-07-08 03:24:44 -0700219 u16 vlan_id = vlan->vlan_id;
Patrick McHardye89fe422007-06-13 12:06:29 -0700220 struct vlan_group *grp, *ngrp = NULL;
221 int err;
222
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700223 grp = __vlan_find_group(real_dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700224 if (!grp) {
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700225 ngrp = grp = vlan_group_alloc(real_dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700226 if (!grp)
227 return -ENOBUFS;
Patrick McHardy70c03b42008-07-05 21:26:57 -0700228 err = vlan_gvrp_init_applicant(real_dev);
229 if (err < 0)
230 goto out_free_group;
Patrick McHardye89fe422007-06-13 12:06:29 -0700231 }
232
Pavel Emelyanov67727182008-03-26 16:27:22 -0700233 err = vlan_group_prealloc_vid(grp, vlan_id);
234 if (err < 0)
Patrick McHardy70c03b42008-07-05 21:26:57 -0700235 goto out_uninit_applicant;
Pavel Emelyanov67727182008-03-26 16:27:22 -0700236
Patrick McHardye89fe422007-06-13 12:06:29 -0700237 err = register_netdevice(dev);
238 if (err < 0)
Patrick McHardy70c03b42008-07-05 21:26:57 -0700239 goto out_uninit_applicant;
Patrick McHardye89fe422007-06-13 12:06:29 -0700240
241 /* Account for reference in struct vlan_dev_info */
242 dev_hold(real_dev);
243
Patrick Mullaneyfc4a7482009-12-03 15:59:22 -0800244 netif_stacked_transfer_operstate(real_dev, dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700245 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
246
247 /* So, got the sucker initialized, now lets place
248 * it into our local structure.
249 */
250 vlan_group_set_device(grp, vlan_id, dev);
Patrick McHardyaf301512008-01-21 00:25:50 -0800251 grp->nr_vlans++;
252
Patrick McHardye89fe422007-06-13 12:06:29 -0700253 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
Stephen Hemminger656299f2008-11-19 21:53:47 -0800254 ops->ndo_vlan_rx_register(real_dev, ngrp);
Patrick McHardye89fe422007-06-13 12:06:29 -0700255 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
Stephen Hemminger656299f2008-11-19 21:53:47 -0800256 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
Patrick McHardye89fe422007-06-13 12:06:29 -0700257
Patrick McHardye89fe422007-06-13 12:06:29 -0700258 return 0;
259
Patrick McHardy70c03b42008-07-05 21:26:57 -0700260out_uninit_applicant:
261 if (ngrp)
262 vlan_gvrp_uninit_applicant(real_dev);
Patrick McHardye89fe422007-06-13 12:06:29 -0700263out_free_group:
Eric Dumazet6b863d12009-11-17 06:45:04 -0800264 if (ngrp) {
265 hlist_del_rcu(&ngrp->hlist);
266 /* Free the group, after all cpu's are done. */
267 call_rcu(&ngrp->rcu, vlan_rcu_free);
268 }
Patrick McHardye89fe422007-06-13 12:06:29 -0700269 return err;
270}
271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272/* Attach a VLAN device to a mac address (ie Ethernet Card).
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700273 * Returns 0 if the device was created or a negative error code otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700275static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 struct net_device *new_dev;
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700278 struct net *net = dev_net(real_dev);
279 struct vlan_net *vn = net_generic(net, vlan_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 char name[IFNAMSIZ];
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700281 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Patrick McHardy9bb85822008-07-08 03:24:44 -0700283 if (vlan_id >= VLAN_VID_MASK)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700284 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
Patrick McHardy9bb85822008-07-08 03:24:44 -0700286 err = vlan_check_real_dev(real_dev, vlan_id);
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700287 if (err < 0)
288 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 /* Gotta set up the fields for the device. */
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700291 switch (vn->name_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 case VLAN_NAME_TYPE_RAW_PLUS_VID:
293 /* name will look like: eth1.0005 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700294 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 break;
296 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
297 /* Put our vlan.VID in the name.
298 * Name will look like: vlan5
299 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700300 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 break;
302 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
303 /* Put our vlan.VID in the name.
304 * Name will look like: eth0.5
305 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700306 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 break;
308 case VLAN_NAME_TYPE_PLUS_VID:
309 /* Put our vlan.VID in the name.
310 * Name will look like: vlan0005
311 */
312 default:
Patrick McHardy9bb85822008-07-08 03:24:44 -0700313 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700314 }
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900315
Eric Dumazet2e59af32009-09-02 18:03:00 -0700316 new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
317 vlan_setup, real_dev->num_tx_queues);
Arjan van de Ven5dd8d1e2006-07-03 00:25:33 -0700318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 if (new_dev == NULL)
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700320 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Eric Dumazet2e59af32009-09-02 18:03:00 -0700322 new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
Pavel Emelyanov65d292a2008-04-16 00:55:06 -0700323 dev_net_set(new_dev, net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 /* need 4 bytes for extra VLAN header info,
325 * hope the underlying device can handle it.
326 */
327 new_dev->mtu = real_dev->mtu;
328
Patrick McHardy9bb85822008-07-08 03:24:44 -0700329 vlan_dev_info(new_dev)->vlan_id = vlan_id;
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800330 vlan_dev_info(new_dev)->real_dev = real_dev;
331 vlan_dev_info(new_dev)->dent = NULL;
332 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Patrick McHardy07b5b172007-06-13 12:07:54 -0700334 new_dev->rtnl_link_ops = &vlan_link_ops;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700335 err = register_vlan_dev(new_dev);
336 if (err < 0)
Patrick McHardye89fe422007-06-13 12:06:29 -0700337 goto out_free_newdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700339 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341out_free_newdev:
342 free_netdev(new_dev);
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700343 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
Patrick McHardy8c979c22007-07-11 19:45:24 -0700346static void vlan_sync_address(struct net_device *dev,
347 struct net_device *vlandev)
348{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800349 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
Patrick McHardy8c979c22007-07-11 19:45:24 -0700350
351 /* May be called without an actual change */
352 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
353 return;
354
355 /* vlan address was different from the old address and is equal to
356 * the new address */
357 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
358 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
Jiri Pirkoccffad252009-05-22 23:22:17 +0000359 dev_unicast_delete(dev, vlandev->dev_addr);
Patrick McHardy8c979c22007-07-11 19:45:24 -0700360
361 /* vlan address was equal to the old address and is different from
362 * the new address */
363 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
364 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
Jiri Pirkoccffad252009-05-22 23:22:17 +0000365 dev_unicast_add(dev, vlandev->dev_addr);
Patrick McHardy8c979c22007-07-11 19:45:24 -0700366
367 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
368}
369
Patrick McHardy5fb13572008-05-20 14:54:50 -0700370static void vlan_transfer_features(struct net_device *dev,
371 struct net_device *vlandev)
372{
373 unsigned long old_features = vlandev->features;
374
Patrick McHardy289c79a2008-05-23 00:22:04 -0700375 vlandev->features &= ~dev->vlan_features;
376 vlandev->features |= dev->features & dev->vlan_features;
Alexander Duyck1ae4be22008-09-11 20:17:05 -0700377 vlandev->gso_max_size = dev->gso_max_size;
Vasu Devb85daa52009-08-14 12:41:07 +0000378#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
379 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
380#endif
Patrick McHardy5fb13572008-05-20 14:54:50 -0700381
382 if (old_features != vlandev->features)
383 netdev_features_change(vlandev);
384}
385
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700386static void __vlan_device_event(struct net_device *dev, unsigned long event)
387{
388 switch (event) {
389 case NETDEV_CHANGENAME:
390 vlan_proc_rem_dev(dev);
391 if (vlan_proc_add_dev(dev) < 0)
392 pr_warning("8021q: failed to change proc name for %s\n",
393 dev->name);
394 break;
Pavel Emelyanov30688a92008-04-16 00:57:01 -0700395 case NETDEV_REGISTER:
396 if (vlan_proc_add_dev(dev) < 0)
397 pr_warning("8021q: failed to add proc entry for %s\n",
398 dev->name);
399 break;
400 case NETDEV_UNREGISTER:
401 vlan_proc_rem_dev(dev);
402 break;
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700403 }
404}
405
Patrick McHardy2029cc22008-01-21 00:26:41 -0800406static int vlan_device_event(struct notifier_block *unused, unsigned long event,
407 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408{
409 struct net_device *dev = ptr;
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700410 struct vlan_group *grp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 int i, flgs;
412 struct net_device *vlandev;
Patrick McHardy5e756592009-11-25 07:54:54 +0000413 struct vlan_dev_info *vlan;
Patrick McHardy29906f62009-10-29 23:43:00 -0700414 LIST_HEAD(list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Patrick McHardy81d85342008-05-20 14:37:36 -0700416 if (is_vlan_dev(dev))
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700417 __vlan_device_event(dev, event);
Pavel Emelyanov802fb172008-04-02 00:08:01 -0700418
Pavel Emelyanova9fde262008-04-16 00:48:04 -0700419 grp = __vlan_find_group(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 if (!grp)
421 goto out;
422
423 /* It is OK that we do not hold the group lock right now,
424 * as we run under the RTNL lock.
425 */
426
427 switch (event) {
428 case NETDEV_CHANGE:
429 /* Propagate real device state to vlan devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800431 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 if (!vlandev)
433 continue;
434
Patrick Mullaneyfc4a7482009-12-03 15:59:22 -0800435 netif_stacked_transfer_operstate(dev, vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 }
437 break;
438
Patrick McHardy8c979c22007-07-11 19:45:24 -0700439 case NETDEV_CHANGEADDR:
440 /* Adjust unicast filters on underlying device */
441 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
442 vlandev = vlan_group_get_device(grp, i);
443 if (!vlandev)
444 continue;
445
Patrick McHardyd932e04a2007-11-10 21:51:40 -0800446 flgs = vlandev->flags;
447 if (!(flgs & IFF_UP))
448 continue;
449
Patrick McHardy8c979c22007-07-11 19:45:24 -0700450 vlan_sync_address(dev, vlandev);
451 }
452 break;
453
Herbert Xu2e477c92009-07-20 07:35:37 -0700454 case NETDEV_CHANGEMTU:
455 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
456 vlandev = vlan_group_get_device(grp, i);
457 if (!vlandev)
458 continue;
459
460 if (vlandev->mtu <= dev->mtu)
461 continue;
462
463 dev_set_mtu(vlandev, dev->mtu);
464 }
465 break;
466
Patrick McHardy5fb13572008-05-20 14:54:50 -0700467 case NETDEV_FEAT_CHANGE:
468 /* Propagate device features to underlying device */
469 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
470 vlandev = vlan_group_get_device(grp, i);
471 if (!vlandev)
472 continue;
473
474 vlan_transfer_features(dev, vlandev);
475 }
476
477 break;
478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 case NETDEV_DOWN:
480 /* Put all VLANs for this dev in the down state too. */
481 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800482 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 if (!vlandev)
484 continue;
485
486 flgs = vlandev->flags;
487 if (!(flgs & IFF_UP))
488 continue;
489
Patrick McHardy5e756592009-11-25 07:54:54 +0000490 vlan = vlan_dev_info(vlandev);
491 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
492 dev_change_flags(vlandev, flgs & ~IFF_UP);
Patrick Mullaneyfc4a7482009-12-03 15:59:22 -0800493 netif_stacked_transfer_operstate(dev, vlandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
495 break;
496
497 case NETDEV_UP:
498 /* Put all VLANs for this dev in the up state too. */
499 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
Dan Aloni5c15bde2007-03-02 20:44:51 -0800500 vlandev = vlan_group_get_device(grp, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 if (!vlandev)
502 continue;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 flgs = vlandev->flags;
505 if (flgs & IFF_UP)
506 continue;
507
Patrick McHardy5e756592009-11-25 07:54:54 +0000508 vlan = vlan_dev_info(vlandev);
509 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
510 dev_change_flags(vlandev, flgs | IFF_UP);
Patrick Mullaneyfc4a7482009-12-03 15:59:22 -0800511 netif_stacked_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:
Patrick McHardy29906f62009-10-29 23:43:00 -0700516 /* Delete all VLANs for this dev. */
517 grp->killall = 1;
518
519 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
520 vlandev = vlan_group_get_device(grp, i);
521 if (!vlandev)
522 continue;
523
524 /* unregistration of last vlan destroys group, abort
525 * afterwards */
526 if (grp->nr_vlans == 1)
527 i = VLAN_GROUP_ARRAY_LEN;
528
529 unregister_vlan_dev(vlandev, &list);
530 }
531 unregister_netdevice_many(&list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700533 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535out:
536 return NOTIFY_DONE;
537}
538
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800539static struct notifier_block vlan_notifier_block __read_mostly = {
540 .notifier_call = vlan_device_event,
541};
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543/*
544 * VLAN IOCTL handler.
545 * o execute requested action or pass command to the device driver
546 * arg is really a struct vlan_ioctl_args __user *.
547 */
Eric W. Biederman881d9662007-09-17 11:56:21 -0700548static int vlan_ioctl_handler(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549{
Patrick McHardyc17d8872007-06-13 12:05:22 -0700550 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 struct vlan_ioctl_args args;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700552 struct net_device *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
554 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
555 return -EFAULT;
556
557 /* Null terminate this sucker, just in case. */
558 args.device1[23] = 0;
559 args.u.device2[23] = 0;
560
Patrick McHardyc17d8872007-06-13 12:05:22 -0700561 rtnl_lock();
562
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 switch (args.cmd) {
564 case SET_VLAN_INGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700565 case SET_VLAN_EGRESS_PRIORITY_CMD:
566 case SET_VLAN_FLAG_CMD:
567 case ADD_VLAN_CMD:
568 case DEL_VLAN_CMD:
569 case GET_VLAN_REALDEV_NAME_CMD:
570 case GET_VLAN_VID_CMD:
571 err = -ENODEV;
Pavel Emelyanov65d292a2008-04-16 00:55:06 -0700572 dev = __dev_get_by_name(net, args.device1);
Patrick McHardyc17d8872007-06-13 12:05:22 -0700573 if (!dev)
574 goto out;
575
576 err = -EINVAL;
Joonwoo Park26a25232008-07-08 03:22:16 -0700577 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700578 goto out;
579 }
580
581 switch (args.cmd) {
582 case SET_VLAN_INGRESS_PRIORITY_CMD:
583 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700585 break;
586 vlan_dev_set_ingress_priority(dev,
587 args.u.skb_priority,
588 args.vlan_qos);
Patrick McHardyfffe4702007-11-07 01:31:32 -0800589 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 break;
591
592 case SET_VLAN_EGRESS_PRIORITY_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700593 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700595 break;
596 err = vlan_dev_set_egress_priority(dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 args.u.skb_priority,
598 args.vlan_qos);
599 break;
600
601 case SET_VLAN_FLAG_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700602 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700604 break;
Patrick McHardyb3ce0322008-07-05 21:26:27 -0700605 err = vlan_dev_change_flags(dev,
606 args.vlan_qos ? args.u.flag : 0,
607 args.u.flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 break;
609
610 case SET_VLAN_NAME_TYPE_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700611 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 if (!capable(CAP_NET_ADMIN))
Pavel Emelyanove35de022007-12-06 22:52:16 -0800613 break;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700614 if ((args.u.name_type >= 0) &&
615 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700616 struct vlan_net *vn;
617
618 vn = net_generic(net, vlan_net_id);
619 vn->name_type = args.u.name_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 err = 0;
621 } else {
622 err = -EINVAL;
623 }
624 break;
625
626 case ADD_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700627 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700629 break;
Patrick McHardy2ae0bf62007-06-13 12:06:43 -0700630 err = register_vlan_device(dev, args.u.VID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 break;
632
633 case DEL_VLAN_CMD:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700634 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 if (!capable(CAP_NET_ADMIN))
Patrick McHardyc17d8872007-06-13 12:05:22 -0700636 break;
Eric Dumazet23289a32009-10-27 07:06:36 +0000637 unregister_vlan_dev(dev, NULL);
Patrick McHardyaf301512008-01-21 00:25:50 -0800638 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 break;
640
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 case GET_VLAN_REALDEV_NAME_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700642 err = 0;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700643 vlan_dev_get_realdev_name(dev, args.u.device2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 if (copy_to_user(arg, &args,
Patrick McHardy2029cc22008-01-21 00:26:41 -0800645 sizeof(struct vlan_ioctl_args)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 break;
648
649 case GET_VLAN_VID_CMD:
Andrew Morton3f5f4342007-07-24 15:37:11 -0700650 err = 0;
Patrick McHardy22d1ba72008-07-08 03:23:57 -0700651 args.u.VID = vlan_dev_vlan_id(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 if (copy_to_user(arg, &args,
Patrick McHardy2029cc22008-01-21 00:26:41 -0800653 sizeof(struct vlan_ioctl_args)))
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900654 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 break;
656
657 default:
Patrick McHardy198a2912008-01-21 00:24:59 -0800658 err = -EOPNOTSUPP;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700659 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700660 }
Mika Kukkonen7eb1b3d2005-12-21 18:39:49 -0800661out:
Patrick McHardyc17d8872007-06-13 12:05:22 -0700662 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 return err;
664}
665
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700666static int vlan_init_net(struct net *net)
667{
Eric W. Biederman946d1a92009-11-29 15:46:05 +0000668 struct vlan_net *vn = net_generic(net, vlan_net_id);
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700669 int err;
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700670
Pavel Emelyanov7a17a2f2008-04-16 00:54:39 -0700671 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
672
Pavel Emelyanovcd1c7012008-04-16 00:51:12 -0700673 err = vlan_proc_init(net);
Pavel Emelyanovcd1c7012008-04-16 00:51:12 -0700674
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700675 return err;
676}
677
678static void vlan_exit_net(struct net *net)
679{
Pavel Emelyanovcd1c7012008-04-16 00:51:12 -0700680 vlan_proc_cleanup(net);
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700681}
682
683static struct pernet_operations vlan_net_ops = {
684 .init = vlan_init_net,
685 .exit = vlan_exit_net,
Eric W. Biederman946d1a92009-11-29 15:46:05 +0000686 .id = &vlan_net_id,
687 .size = sizeof(struct vlan_net),
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700688};
689
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800690static int __init vlan_proto_init(void)
691{
692 int err;
693
694 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
695 pr_info("All bugs added by %s\n", vlan_buggyright);
696
Eric W. Biederman91e2ff32009-12-02 13:19:08 +0000697 err = register_pernet_subsys(&vlan_net_ops);
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700698 if (err < 0)
699 goto err0;
700
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800701 err = register_netdevice_notifier(&vlan_notifier_block);
702 if (err < 0)
703 goto err2;
704
Patrick McHardy70c03b42008-07-05 21:26:57 -0700705 err = vlan_gvrp_init();
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800706 if (err < 0)
707 goto err3;
708
Patrick McHardy70c03b42008-07-05 21:26:57 -0700709 err = vlan_netlink_init();
710 if (err < 0)
711 goto err4;
712
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800713 dev_add_pack(&vlan_packet_type);
714 vlan_ioctl_set(vlan_ioctl_handler);
715 return 0;
716
Patrick McHardy70c03b42008-07-05 21:26:57 -0700717err4:
718 vlan_gvrp_uninit();
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800719err3:
720 unregister_netdevice_notifier(&vlan_notifier_block);
721err2:
Eric W. Biederman91e2ff32009-12-02 13:19:08 +0000722 unregister_pernet_subsys(&vlan_net_ops);
Pavel Emelyanovd9ed0f02008-04-16 00:49:09 -0700723err0:
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800724 return err;
725}
726
727static void __exit vlan_cleanup_module(void)
728{
729 unsigned int i;
730
731 vlan_ioctl_set(NULL);
732 vlan_netlink_fini();
733
734 unregister_netdevice_notifier(&vlan_notifier_block);
735
736 dev_remove_pack(&vlan_packet_type);
737
738 /* This table must be empty if there are no module references left. */
739 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
740 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
741
Eric W. Biederman91e2ff32009-12-02 13:19:08 +0000742 unregister_pernet_subsys(&vlan_net_ops);
Jesper Dangaard Brouer6e327c12009-06-08 03:11:28 +0000743 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Patrick McHardy70c03b42008-07-05 21:26:57 -0700744
745 vlan_gvrp_uninit();
Patrick McHardy69ab4b72008-01-21 00:25:15 -0800746}
747
748module_init(vlan_proto_init);
749module_exit(vlan_cleanup_module);
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751MODULE_LICENSE("GPL");
752MODULE_VERSION(DRV_VERSION);