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;
50 /* End of global variables definitions. */
52 static void vlan_group_free(struct vlan_group *grp)
56 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
57 kfree(grp->vlan_devices_arrays[i]);
61 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
63 struct vlan_group *grp;
65 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
69 grp->real_dev = real_dev;
73 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
75 struct net_device **array;
80 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
84 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
85 array = kzalloc(size, GFP_KERNEL);
89 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
93 static void vlan_rcu_free(struct rcu_head *rcu)
95 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
98 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
100 struct vlan_dev_info *vlan = vlan_dev_info(dev);
101 struct net_device *real_dev = vlan->real_dev;
102 const struct net_device_ops *ops = real_dev->netdev_ops;
103 struct vlan_group *grp;
104 u16 vlan_id = vlan->vlan_id;
108 grp = rtnl_dereference(real_dev->vlgrp);
111 /* Take it out of our own structures, but be sure to interlock with
112 * HW accelerating devices or SW vlan input packet processing if
113 * VLAN is not 0 (leave it there for 802.1p).
115 if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
116 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
120 if (vlan->flags & VLAN_FLAG_GVRP)
121 vlan_gvrp_request_leave(dev);
123 vlan_group_set_device(grp, vlan_id, NULL);
124 /* Because unregister_netdevice_queue() makes sure at least one rcu
125 * grace period is respected before device freeing,
126 * we dont need to call synchronize_net() here.
128 unregister_netdevice_queue(dev, head);
130 /* If the group is now empty, kill off the group. */
131 if (grp->nr_vlans == 0) {
132 vlan_gvrp_uninit_applicant(real_dev);
134 rcu_assign_pointer(real_dev->vlgrp, NULL);
135 if (ops->ndo_vlan_rx_register)
136 ops->ndo_vlan_rx_register(real_dev, NULL);
138 /* Free the group, after all cpu's are done. */
139 call_rcu(&grp->rcu, vlan_rcu_free);
142 /* Get rid of the vlan's reference to real_dev */
146 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
148 const char *name = real_dev->name;
149 const struct net_device_ops *ops = real_dev->netdev_ops;
151 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
152 pr_info("8021q: VLANs not supported on %s\n", name);
156 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
157 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
158 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
162 if (vlan_find_dev(real_dev, vlan_id) != NULL)
168 int register_vlan_dev(struct net_device *dev)
170 struct vlan_dev_info *vlan = vlan_dev_info(dev);
171 struct net_device *real_dev = vlan->real_dev;
172 const struct net_device_ops *ops = real_dev->netdev_ops;
173 u16 vlan_id = vlan->vlan_id;
174 struct vlan_group *grp, *ngrp = NULL;
177 grp = rtnl_dereference(real_dev->vlgrp);
179 ngrp = grp = vlan_group_alloc(real_dev);
182 err = vlan_gvrp_init_applicant(real_dev);
187 err = vlan_group_prealloc_vid(grp, vlan_id);
189 goto out_uninit_applicant;
191 err = register_netdevice(dev);
193 goto out_uninit_applicant;
195 /* Account for reference in struct vlan_dev_info */
198 netif_stacked_transfer_operstate(real_dev, dev);
199 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
201 /* So, got the sucker initialized, now lets place
202 * it into our local structure.
204 vlan_group_set_device(grp, vlan_id, dev);
208 if (ops->ndo_vlan_rx_register && (real_dev->features & NETIF_F_HW_VLAN_RX))
209 ops->ndo_vlan_rx_register(real_dev, ngrp);
210 rcu_assign_pointer(real_dev->vlgrp, ngrp);
212 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
213 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
217 out_uninit_applicant:
219 vlan_gvrp_uninit_applicant(real_dev);
222 /* Free the group, after all cpu's are done. */
223 call_rcu(&ngrp->rcu, vlan_rcu_free);
228 /* Attach a VLAN device to a mac address (ie Ethernet Card).
229 * Returns 0 if the device was created or a negative error code otherwise.
231 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
233 struct net_device *new_dev;
234 struct net *net = dev_net(real_dev);
235 struct vlan_net *vn = net_generic(net, vlan_net_id);
239 if (vlan_id >= VLAN_VID_MASK)
242 err = vlan_check_real_dev(real_dev, vlan_id);
246 /* Gotta set up the fields for the device. */
247 switch (vn->name_type) {
248 case VLAN_NAME_TYPE_RAW_PLUS_VID:
249 /* name will look like: eth1.0005 */
250 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
252 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
253 /* Put our vlan.VID in the name.
254 * Name will look like: vlan5
256 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
258 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
259 /* Put our vlan.VID in the name.
260 * Name will look like: eth0.5
262 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
264 case VLAN_NAME_TYPE_PLUS_VID:
265 /* Put our vlan.VID in the name.
266 * Name will look like: vlan0005
269 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
272 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, vlan_setup);
277 dev_net_set(new_dev, net);
278 /* need 4 bytes for extra VLAN header info,
279 * hope the underlying device can handle it.
281 new_dev->mtu = real_dev->mtu;
283 vlan_dev_info(new_dev)->vlan_id = vlan_id;
284 vlan_dev_info(new_dev)->real_dev = real_dev;
285 vlan_dev_info(new_dev)->dent = NULL;
286 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
288 new_dev->rtnl_link_ops = &vlan_link_ops;
289 err = register_vlan_dev(new_dev);
291 goto out_free_newdev;
296 free_netdev(new_dev);
300 static void vlan_sync_address(struct net_device *dev,
301 struct net_device *vlandev)
303 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
305 /* May be called without an actual change */
306 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
309 /* vlan address was different from the old address and is equal to
311 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
312 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
313 dev_uc_del(dev, vlandev->dev_addr);
315 /* vlan address was equal to the old address and is different from
317 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
318 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
319 dev_uc_add(dev, vlandev->dev_addr);
321 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
324 static void vlan_transfer_features(struct net_device *dev,
325 struct net_device *vlandev)
327 vlandev->gso_max_size = dev->gso_max_size;
329 if (dev->features & NETIF_F_HW_VLAN_TX)
330 vlandev->hard_header_len = dev->hard_header_len;
332 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
334 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
335 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
338 netdev_update_features(vlandev);
341 static void __vlan_device_event(struct net_device *dev, unsigned long event)
344 case NETDEV_CHANGENAME:
345 vlan_proc_rem_dev(dev);
346 if (vlan_proc_add_dev(dev) < 0)
347 pr_warning("8021q: failed to change proc name for %s\n",
350 case NETDEV_REGISTER:
351 if (vlan_proc_add_dev(dev) < 0)
352 pr_warning("8021q: failed to add proc entry for %s\n",
355 case NETDEV_UNREGISTER:
356 vlan_proc_rem_dev(dev);
361 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
364 struct net_device *dev = ptr;
365 struct vlan_group *grp;
367 struct net_device *vlandev;
368 struct vlan_dev_info *vlan;
371 if (is_vlan_dev(dev))
372 __vlan_device_event(dev, event);
374 if ((event == NETDEV_UP) &&
375 (dev->features & NETIF_F_HW_VLAN_FILTER) &&
376 dev->netdev_ops->ndo_vlan_rx_add_vid) {
377 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
379 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
382 grp = rtnl_dereference(dev->vlgrp);
386 /* It is OK that we do not hold the group lock right now,
387 * as we run under the RTNL lock.
392 /* Propagate real device state to vlan devices */
393 for (i = 0; i < VLAN_N_VID; i++) {
394 vlandev = vlan_group_get_device(grp, i);
398 netif_stacked_transfer_operstate(dev, vlandev);
402 case NETDEV_CHANGEADDR:
403 /* Adjust unicast filters on underlying device */
404 for (i = 0; i < VLAN_N_VID; i++) {
405 vlandev = vlan_group_get_device(grp, i);
409 flgs = vlandev->flags;
410 if (!(flgs & IFF_UP))
413 vlan_sync_address(dev, vlandev);
417 case NETDEV_CHANGEMTU:
418 for (i = 0; i < VLAN_N_VID; i++) {
419 vlandev = vlan_group_get_device(grp, i);
423 if (vlandev->mtu <= dev->mtu)
426 dev_set_mtu(vlandev, dev->mtu);
430 case NETDEV_FEAT_CHANGE:
431 /* Propagate device features to underlying device */
432 for (i = 0; i < VLAN_N_VID; i++) {
433 vlandev = vlan_group_get_device(grp, i);
437 vlan_transfer_features(dev, vlandev);
443 /* Put all VLANs for this dev in the down state too. */
444 for (i = 0; i < VLAN_N_VID; i++) {
445 vlandev = vlan_group_get_device(grp, i);
449 flgs = vlandev->flags;
450 if (!(flgs & IFF_UP))
453 vlan = vlan_dev_info(vlandev);
454 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
455 dev_change_flags(vlandev, flgs & ~IFF_UP);
456 netif_stacked_transfer_operstate(dev, vlandev);
461 /* Put all VLANs for this dev in the up state too. */
462 for (i = 0; i < VLAN_N_VID; i++) {
463 vlandev = vlan_group_get_device(grp, i);
467 flgs = vlandev->flags;
471 vlan = vlan_dev_info(vlandev);
472 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
473 dev_change_flags(vlandev, flgs | IFF_UP);
474 netif_stacked_transfer_operstate(dev, vlandev);
478 case NETDEV_UNREGISTER:
479 /* twiddle thumbs on netns device moves */
480 if (dev->reg_state != NETREG_UNREGISTERING)
483 for (i = 0; i < VLAN_N_VID; i++) {
484 vlandev = vlan_group_get_device(grp, i);
488 /* unregistration of last vlan destroys group, abort
490 if (grp->nr_vlans == 1)
493 unregister_vlan_dev(vlandev, &list);
495 unregister_netdevice_many(&list);
498 case NETDEV_PRE_TYPE_CHANGE:
499 /* Forbid underlaying device to change its type. */
502 case NETDEV_NOTIFY_PEERS:
503 case NETDEV_BONDING_FAILOVER:
504 /* Propagate to vlan devices */
505 for (i = 0; i < VLAN_N_VID; i++) {
506 vlandev = vlan_group_get_device(grp, i);
510 call_netdevice_notifiers(event, vlandev);
519 static struct notifier_block vlan_notifier_block __read_mostly = {
520 .notifier_call = vlan_device_event,
524 * VLAN IOCTL handler.
525 * o execute requested action or pass command to the device driver
526 * arg is really a struct vlan_ioctl_args __user *.
528 static int vlan_ioctl_handler(struct net *net, void __user *arg)
531 struct vlan_ioctl_args args;
532 struct net_device *dev = NULL;
534 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
537 /* Null terminate this sucker, just in case. */
538 args.device1[23] = 0;
539 args.u.device2[23] = 0;
544 case SET_VLAN_INGRESS_PRIORITY_CMD:
545 case SET_VLAN_EGRESS_PRIORITY_CMD:
546 case SET_VLAN_FLAG_CMD:
549 case GET_VLAN_REALDEV_NAME_CMD:
550 case GET_VLAN_VID_CMD:
552 dev = __dev_get_by_name(net, args.device1);
557 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
562 case SET_VLAN_INGRESS_PRIORITY_CMD:
564 if (!capable(CAP_NET_ADMIN))
566 vlan_dev_set_ingress_priority(dev,
572 case SET_VLAN_EGRESS_PRIORITY_CMD:
574 if (!capable(CAP_NET_ADMIN))
576 err = vlan_dev_set_egress_priority(dev,
581 case SET_VLAN_FLAG_CMD:
583 if (!capable(CAP_NET_ADMIN))
585 err = vlan_dev_change_flags(dev,
586 args.vlan_qos ? args.u.flag : 0,
590 case SET_VLAN_NAME_TYPE_CMD:
592 if (!capable(CAP_NET_ADMIN))
594 if ((args.u.name_type >= 0) &&
595 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
598 vn = net_generic(net, vlan_net_id);
599 vn->name_type = args.u.name_type;
608 if (!capable(CAP_NET_ADMIN))
610 err = register_vlan_device(dev, args.u.VID);
615 if (!capable(CAP_NET_ADMIN))
617 unregister_vlan_dev(dev, NULL);
621 case GET_VLAN_REALDEV_NAME_CMD:
623 vlan_dev_get_realdev_name(dev, args.u.device2);
624 if (copy_to_user(arg, &args,
625 sizeof(struct vlan_ioctl_args)))
629 case GET_VLAN_VID_CMD:
631 args.u.VID = vlan_dev_vlan_id(dev);
632 if (copy_to_user(arg, &args,
633 sizeof(struct vlan_ioctl_args)))
646 static int __net_init vlan_init_net(struct net *net)
648 struct vlan_net *vn = net_generic(net, vlan_net_id);
651 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
653 err = vlan_proc_init(net);
658 static void __net_exit vlan_exit_net(struct net *net)
660 vlan_proc_cleanup(net);
663 static struct pernet_operations vlan_net_ops = {
664 .init = vlan_init_net,
665 .exit = vlan_exit_net,
667 .size = sizeof(struct vlan_net),
670 static int __init vlan_proto_init(void)
674 pr_info("%s v%s\n", vlan_fullname, vlan_version);
676 err = register_pernet_subsys(&vlan_net_ops);
680 err = register_netdevice_notifier(&vlan_notifier_block);
684 err = vlan_gvrp_init();
688 err = vlan_netlink_init();
692 vlan_ioctl_set(vlan_ioctl_handler);
698 unregister_netdevice_notifier(&vlan_notifier_block);
700 unregister_pernet_subsys(&vlan_net_ops);
705 static void __exit vlan_cleanup_module(void)
707 vlan_ioctl_set(NULL);
710 unregister_netdevice_notifier(&vlan_notifier_block);
712 unregister_pernet_subsys(&vlan_net_ops);
713 rcu_barrier(); /* Wait for completion of call_rcu()'s */
718 module_init(vlan_proto_init);
719 module_exit(vlan_cleanup_module);
721 MODULE_LICENSE("GPL");
722 MODULE_VERSION(DRV_VERSION);