3 * Ethernet-type device handling.
5 * Authors: Ben Greear <greearb@candelatech.com>
6 * Please send support related email to: netdev@vger.kernel.org
7 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
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>
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.
21 #include <linux/capability.h>
22 #include <linux/module.h>
23 #include <linux/netdevice.h>
24 #include <linux/skbuff.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/rculist.h>
28 #include <net/p8022.h>
30 #include <linux/rtnetlink.h>
31 #include <linux/notifier.h>
32 #include <net/rtnetlink.h>
33 #include <net/net_namespace.h>
34 #include <net/netns/generic.h>
35 #include <asm/uaccess.h>
37 #include <linux/if_vlan.h>
41 #define DRV_VERSION "1.8"
43 /* Global VLAN variables */
45 int vlan_net_id __read_mostly
;
47 const char vlan_fullname
[] = "802.1Q VLAN Support";
48 const char vlan_version
[] = DRV_VERSION
;
49 static const char vlan_copyright
[] = "Ben Greear <greearb@candelatech.com>";
50 static const char vlan_buggyright
[] = "David S. Miller <davem@redhat.com>";
52 /* End of global variables definitions. */
54 static void vlan_group_free(struct vlan_group
*grp
)
58 for (i
= 0; i
< VLAN_GROUP_ARRAY_SPLIT_PARTS
; i
++)
59 kfree(grp
->vlan_devices_arrays
[i
]);
63 static struct vlan_group
*vlan_group_alloc(struct net_device
*real_dev
)
65 struct vlan_group
*grp
;
67 grp
= kzalloc(sizeof(struct vlan_group
), GFP_KERNEL
);
71 grp
->real_dev
= real_dev
;
75 static int vlan_group_prealloc_vid(struct vlan_group
*vg
, u16 vlan_id
)
77 struct net_device
**array
;
82 array
= vg
->vlan_devices_arrays
[vlan_id
/ VLAN_GROUP_ARRAY_PART_LEN
];
86 size
= sizeof(struct net_device
*) * VLAN_GROUP_ARRAY_PART_LEN
;
87 array
= kzalloc(size
, GFP_KERNEL
);
91 vg
->vlan_devices_arrays
[vlan_id
/ VLAN_GROUP_ARRAY_PART_LEN
] = array
;
95 static void vlan_rcu_free(struct rcu_head
*rcu
)
97 vlan_group_free(container_of(rcu
, struct vlan_group
, rcu
));
100 void unregister_vlan_dev(struct net_device
*dev
, struct list_head
*head
)
102 struct vlan_dev_info
*vlan
= vlan_dev_info(dev
);
103 struct net_device
*real_dev
= vlan
->real_dev
;
104 const struct net_device_ops
*ops
= real_dev
->netdev_ops
;
105 struct vlan_group
*grp
;
106 u16 vlan_id
= vlan
->vlan_id
;
110 grp
= rtnl_dereference(real_dev
->vlgrp
);
113 /* Take it out of our own structures, but be sure to interlock with
114 * HW accelerating devices or SW vlan input packet processing if
115 * VLAN is not 0 (leave it there for 802.1p).
117 if (vlan_id
&& (real_dev
->features
& NETIF_F_HW_VLAN_FILTER
))
118 ops
->ndo_vlan_rx_kill_vid(real_dev
, vlan_id
);
122 if (vlan
->flags
& VLAN_FLAG_GVRP
)
123 vlan_gvrp_request_leave(dev
);
125 vlan_group_set_device(grp
, vlan_id
, NULL
);
126 /* Because unregister_netdevice_queue() makes sure at least one rcu
127 * grace period is respected before device freeing,
128 * we dont need to call synchronize_net() here.
130 unregister_netdevice_queue(dev
, head
);
132 /* If the group is now empty, kill off the group. */
133 if (grp
->nr_vlans
== 0) {
134 vlan_gvrp_uninit_applicant(real_dev
);
136 rcu_assign_pointer(real_dev
->vlgrp
, NULL
);
137 if (ops
->ndo_vlan_rx_register
)
138 ops
->ndo_vlan_rx_register(real_dev
, NULL
);
140 /* Free the group, after all cpu's are done. */
141 call_rcu(&grp
->rcu
, vlan_rcu_free
);
144 /* Get rid of the vlan's reference to real_dev */
148 int vlan_check_real_dev(struct net_device
*real_dev
, u16 vlan_id
)
150 const char *name
= real_dev
->name
;
151 const struct net_device_ops
*ops
= real_dev
->netdev_ops
;
153 if (real_dev
->features
& NETIF_F_VLAN_CHALLENGED
) {
154 pr_info("8021q: VLANs not supported on %s\n", name
);
158 if ((real_dev
->features
& NETIF_F_HW_VLAN_FILTER
) &&
159 (!ops
->ndo_vlan_rx_add_vid
|| !ops
->ndo_vlan_rx_kill_vid
)) {
160 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name
);
164 if (vlan_find_dev(real_dev
, vlan_id
) != NULL
)
170 int register_vlan_dev(struct net_device
*dev
)
172 struct vlan_dev_info
*vlan
= vlan_dev_info(dev
);
173 struct net_device
*real_dev
= vlan
->real_dev
;
174 const struct net_device_ops
*ops
= real_dev
->netdev_ops
;
175 u16 vlan_id
= vlan
->vlan_id
;
176 struct vlan_group
*grp
, *ngrp
= NULL
;
179 grp
= rtnl_dereference(real_dev
->vlgrp
);
181 ngrp
= grp
= vlan_group_alloc(real_dev
);
184 err
= vlan_gvrp_init_applicant(real_dev
);
189 err
= vlan_group_prealloc_vid(grp
, vlan_id
);
191 goto out_uninit_applicant
;
193 err
= register_netdevice(dev
);
195 goto out_uninit_applicant
;
197 /* Account for reference in struct vlan_dev_info */
200 netif_stacked_transfer_operstate(real_dev
, dev
);
201 linkwatch_fire_event(dev
); /* _MUST_ call rfc2863_policy() */
203 /* So, got the sucker initialized, now lets place
204 * it into our local structure.
206 vlan_group_set_device(grp
, vlan_id
, dev
);
210 if (ops
->ndo_vlan_rx_register
)
211 ops
->ndo_vlan_rx_register(real_dev
, ngrp
);
212 rcu_assign_pointer(real_dev
->vlgrp
, ngrp
);
214 if (real_dev
->features
& NETIF_F_HW_VLAN_FILTER
)
215 ops
->ndo_vlan_rx_add_vid(real_dev
, vlan_id
);
219 out_uninit_applicant
:
221 vlan_gvrp_uninit_applicant(real_dev
);
224 /* Free the group, after all cpu's are done. */
225 call_rcu(&ngrp
->rcu
, vlan_rcu_free
);
230 /* Attach a VLAN device to a mac address (ie Ethernet Card).
231 * Returns 0 if the device was created or a negative error code otherwise.
233 static int register_vlan_device(struct net_device
*real_dev
, u16 vlan_id
)
235 struct net_device
*new_dev
;
236 struct net
*net
= dev_net(real_dev
);
237 struct vlan_net
*vn
= net_generic(net
, vlan_net_id
);
241 if (vlan_id
>= VLAN_VID_MASK
)
244 err
= vlan_check_real_dev(real_dev
, vlan_id
);
248 /* Gotta set up the fields for the device. */
249 switch (vn
->name_type
) {
250 case VLAN_NAME_TYPE_RAW_PLUS_VID
:
251 /* name will look like: eth1.0005 */
252 snprintf(name
, IFNAMSIZ
, "%s.%.4i", real_dev
->name
, vlan_id
);
254 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD
:
255 /* Put our vlan.VID in the name.
256 * Name will look like: vlan5
258 snprintf(name
, IFNAMSIZ
, "vlan%i", vlan_id
);
260 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
:
261 /* Put our vlan.VID in the name.
262 * Name will look like: eth0.5
264 snprintf(name
, IFNAMSIZ
, "%s.%i", real_dev
->name
, vlan_id
);
266 case VLAN_NAME_TYPE_PLUS_VID
:
267 /* Put our vlan.VID in the name.
268 * Name will look like: vlan0005
271 snprintf(name
, IFNAMSIZ
, "vlan%.4i", vlan_id
);
274 new_dev
= alloc_netdev(sizeof(struct vlan_dev_info
), name
, vlan_setup
);
279 dev_net_set(new_dev
, net
);
280 /* need 4 bytes for extra VLAN header info,
281 * hope the underlying device can handle it.
283 new_dev
->mtu
= real_dev
->mtu
;
285 vlan_dev_info(new_dev
)->vlan_id
= vlan_id
;
286 vlan_dev_info(new_dev
)->real_dev
= real_dev
;
287 vlan_dev_info(new_dev
)->dent
= NULL
;
288 vlan_dev_info(new_dev
)->flags
= VLAN_FLAG_REORDER_HDR
;
290 new_dev
->rtnl_link_ops
= &vlan_link_ops
;
291 err
= register_vlan_dev(new_dev
);
293 goto out_free_newdev
;
298 free_netdev(new_dev
);
302 static void vlan_sync_address(struct net_device
*dev
,
303 struct net_device
*vlandev
)
305 struct vlan_dev_info
*vlan
= vlan_dev_info(vlandev
);
307 /* May be called without an actual change */
308 if (!compare_ether_addr(vlan
->real_dev_addr
, dev
->dev_addr
))
311 /* vlan address was different from the old address and is equal to
313 if (compare_ether_addr(vlandev
->dev_addr
, vlan
->real_dev_addr
) &&
314 !compare_ether_addr(vlandev
->dev_addr
, dev
->dev_addr
))
315 dev_uc_del(dev
, vlandev
->dev_addr
);
317 /* vlan address was equal to the old address and is different from
319 if (!compare_ether_addr(vlandev
->dev_addr
, vlan
->real_dev_addr
) &&
320 compare_ether_addr(vlandev
->dev_addr
, dev
->dev_addr
))
321 dev_uc_add(dev
, vlandev
->dev_addr
);
323 memcpy(vlan
->real_dev_addr
, dev
->dev_addr
, ETH_ALEN
);
326 static void vlan_transfer_features(struct net_device
*dev
,
327 struct net_device
*vlandev
)
329 vlandev
->gso_max_size
= dev
->gso_max_size
;
331 if (dev
->features
& NETIF_F_HW_VLAN_TX
)
332 vlandev
->hard_header_len
= dev
->hard_header_len
;
334 vlandev
->hard_header_len
= dev
->hard_header_len
+ VLAN_HLEN
;
336 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
337 vlandev
->fcoe_ddp_xid
= dev
->fcoe_ddp_xid
;
340 netdev_update_features(vlandev
);
343 static void __vlan_device_event(struct net_device
*dev
, unsigned long event
)
346 case NETDEV_CHANGENAME
:
347 vlan_proc_rem_dev(dev
);
348 if (vlan_proc_add_dev(dev
) < 0)
349 pr_warning("8021q: failed to change proc name for %s\n",
352 case NETDEV_REGISTER
:
353 if (vlan_proc_add_dev(dev
) < 0)
354 pr_warning("8021q: failed to add proc entry for %s\n",
357 case NETDEV_UNREGISTER
:
358 vlan_proc_rem_dev(dev
);
363 static int vlan_device_event(struct notifier_block
*unused
, unsigned long event
,
366 struct net_device
*dev
= ptr
;
367 struct vlan_group
*grp
;
369 struct net_device
*vlandev
;
370 struct vlan_dev_info
*vlan
;
373 if (is_vlan_dev(dev
))
374 __vlan_device_event(dev
, event
);
376 if ((event
== NETDEV_UP
) &&
377 (dev
->features
& NETIF_F_HW_VLAN_FILTER
) &&
378 dev
->netdev_ops
->ndo_vlan_rx_add_vid
) {
379 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
381 dev
->netdev_ops
->ndo_vlan_rx_add_vid(dev
, 0);
384 grp
= rtnl_dereference(dev
->vlgrp
);
388 /* It is OK that we do not hold the group lock right now,
389 * as we run under the RTNL lock.
394 /* Propagate real device state to vlan devices */
395 for (i
= 0; i
< VLAN_N_VID
; i
++) {
396 vlandev
= vlan_group_get_device(grp
, i
);
400 netif_stacked_transfer_operstate(dev
, vlandev
);
404 case NETDEV_CHANGEADDR
:
405 /* Adjust unicast filters on underlying device */
406 for (i
= 0; i
< VLAN_N_VID
; i
++) {
407 vlandev
= vlan_group_get_device(grp
, i
);
411 flgs
= vlandev
->flags
;
412 if (!(flgs
& IFF_UP
))
415 vlan_sync_address(dev
, vlandev
);
419 case NETDEV_CHANGEMTU
:
420 for (i
= 0; i
< VLAN_N_VID
; i
++) {
421 vlandev
= vlan_group_get_device(grp
, i
);
425 if (vlandev
->mtu
<= dev
->mtu
)
428 dev_set_mtu(vlandev
, dev
->mtu
);
432 case NETDEV_FEAT_CHANGE
:
433 /* Propagate device features to underlying device */
434 for (i
= 0; i
< VLAN_N_VID
; i
++) {
435 vlandev
= vlan_group_get_device(grp
, i
);
439 vlan_transfer_features(dev
, vlandev
);
445 /* Put all VLANs for this dev in the down state too. */
446 for (i
= 0; i
< VLAN_N_VID
; i
++) {
447 vlandev
= vlan_group_get_device(grp
, i
);
451 flgs
= vlandev
->flags
;
452 if (!(flgs
& IFF_UP
))
455 vlan
= vlan_dev_info(vlandev
);
456 if (!(vlan
->flags
& VLAN_FLAG_LOOSE_BINDING
))
457 dev_change_flags(vlandev
, flgs
& ~IFF_UP
);
458 netif_stacked_transfer_operstate(dev
, vlandev
);
463 /* Put all VLANs for this dev in the up state too. */
464 for (i
= 0; i
< VLAN_N_VID
; i
++) {
465 vlandev
= vlan_group_get_device(grp
, i
);
469 flgs
= vlandev
->flags
;
473 vlan
= vlan_dev_info(vlandev
);
474 if (!(vlan
->flags
& VLAN_FLAG_LOOSE_BINDING
))
475 dev_change_flags(vlandev
, flgs
| IFF_UP
);
476 netif_stacked_transfer_operstate(dev
, vlandev
);
480 case NETDEV_UNREGISTER
:
481 /* twiddle thumbs on netns device moves */
482 if (dev
->reg_state
!= NETREG_UNREGISTERING
)
485 for (i
= 0; i
< VLAN_N_VID
; i
++) {
486 vlandev
= vlan_group_get_device(grp
, i
);
490 /* unregistration of last vlan destroys group, abort
492 if (grp
->nr_vlans
== 1)
495 unregister_vlan_dev(vlandev
, &list
);
497 unregister_netdevice_many(&list
);
500 case NETDEV_PRE_TYPE_CHANGE
:
501 /* Forbid underlaying device to change its type. */
504 case NETDEV_NOTIFY_PEERS
:
505 case NETDEV_BONDING_FAILOVER
:
506 /* Propagate to vlan devices */
507 for (i
= 0; i
< VLAN_N_VID
; i
++) {
508 vlandev
= vlan_group_get_device(grp
, i
);
512 call_netdevice_notifiers(event
, vlandev
);
521 static struct notifier_block vlan_notifier_block __read_mostly
= {
522 .notifier_call
= vlan_device_event
,
526 * VLAN IOCTL handler.
527 * o execute requested action or pass command to the device driver
528 * arg is really a struct vlan_ioctl_args __user *.
530 static int vlan_ioctl_handler(struct net
*net
, void __user
*arg
)
533 struct vlan_ioctl_args args
;
534 struct net_device
*dev
= NULL
;
536 if (copy_from_user(&args
, arg
, sizeof(struct vlan_ioctl_args
)))
539 /* Null terminate this sucker, just in case. */
540 args
.device1
[23] = 0;
541 args
.u
.device2
[23] = 0;
546 case SET_VLAN_INGRESS_PRIORITY_CMD
:
547 case SET_VLAN_EGRESS_PRIORITY_CMD
:
548 case SET_VLAN_FLAG_CMD
:
551 case GET_VLAN_REALDEV_NAME_CMD
:
552 case GET_VLAN_VID_CMD
:
554 dev
= __dev_get_by_name(net
, args
.device1
);
559 if (args
.cmd
!= ADD_VLAN_CMD
&& !is_vlan_dev(dev
))
564 case SET_VLAN_INGRESS_PRIORITY_CMD
:
566 if (!capable(CAP_NET_ADMIN
))
568 vlan_dev_set_ingress_priority(dev
,
574 case SET_VLAN_EGRESS_PRIORITY_CMD
:
576 if (!capable(CAP_NET_ADMIN
))
578 err
= vlan_dev_set_egress_priority(dev
,
583 case SET_VLAN_FLAG_CMD
:
585 if (!capable(CAP_NET_ADMIN
))
587 err
= vlan_dev_change_flags(dev
,
588 args
.vlan_qos
? args
.u
.flag
: 0,
592 case SET_VLAN_NAME_TYPE_CMD
:
594 if (!capable(CAP_NET_ADMIN
))
596 if ((args
.u
.name_type
>= 0) &&
597 (args
.u
.name_type
< VLAN_NAME_TYPE_HIGHEST
)) {
600 vn
= net_generic(net
, vlan_net_id
);
601 vn
->name_type
= args
.u
.name_type
;
610 if (!capable(CAP_NET_ADMIN
))
612 err
= register_vlan_device(dev
, args
.u
.VID
);
617 if (!capable(CAP_NET_ADMIN
))
619 unregister_vlan_dev(dev
, NULL
);
623 case GET_VLAN_REALDEV_NAME_CMD
:
625 vlan_dev_get_realdev_name(dev
, args
.u
.device2
);
626 if (copy_to_user(arg
, &args
,
627 sizeof(struct vlan_ioctl_args
)))
631 case GET_VLAN_VID_CMD
:
633 args
.u
.VID
= vlan_dev_vlan_id(dev
);
634 if (copy_to_user(arg
, &args
,
635 sizeof(struct vlan_ioctl_args
)))
648 static int __net_init
vlan_init_net(struct net
*net
)
650 struct vlan_net
*vn
= net_generic(net
, vlan_net_id
);
653 vn
->name_type
= VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
;
655 err
= vlan_proc_init(net
);
660 static void __net_exit
vlan_exit_net(struct net
*net
)
662 vlan_proc_cleanup(net
);
665 static struct pernet_operations vlan_net_ops
= {
666 .init
= vlan_init_net
,
667 .exit
= vlan_exit_net
,
669 .size
= sizeof(struct vlan_net
),
672 static int __init
vlan_proto_init(void)
676 pr_info("%s v%s %s\n", vlan_fullname
, vlan_version
, vlan_copyright
);
677 pr_info("All bugs added by %s\n", vlan_buggyright
);
679 err
= register_pernet_subsys(&vlan_net_ops
);
683 err
= register_netdevice_notifier(&vlan_notifier_block
);
687 err
= vlan_gvrp_init();
691 err
= vlan_netlink_init();
695 vlan_ioctl_set(vlan_ioctl_handler
);
701 unregister_netdevice_notifier(&vlan_notifier_block
);
703 unregister_pernet_subsys(&vlan_net_ops
);
708 static void __exit
vlan_cleanup_module(void)
710 vlan_ioctl_set(NULL
);
713 unregister_netdevice_notifier(&vlan_notifier_block
);
715 unregister_pernet_subsys(&vlan_net_ops
);
716 rcu_barrier(); /* Wait for completion of call_rcu()'s */
721 module_init(vlan_proto_init
);
722 module_exit(vlan_cleanup_module
);
724 MODULE_LICENSE("GPL");
725 MODULE_VERSION(DRV_VERSION
);