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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23 #include <linux/capability.h>
24 #include <linux/module.h>
25 #include <linux/netdevice.h>
26 #include <linux/skbuff.h>
27 #include <linux/slab.h>
28 #include <linux/init.h>
29 #include <linux/rculist.h>
30 #include <net/p8022.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/notifier.h>
34 #include <net/rtnetlink.h>
35 #include <net/net_namespace.h>
36 #include <net/netns/generic.h>
37 #include <asm/uaccess.h>
39 #include <linux/if_vlan.h>
43 #define DRV_VERSION "1.8"
45 /* Global VLAN variables */
47 int vlan_net_id __read_mostly;
49 const char vlan_fullname[] = "802.1Q VLAN Support";
50 const char vlan_version[] = DRV_VERSION;
52 /* End of global variables definitions. */
54 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
56 struct net_device **array;
61 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
65 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
66 array = kzalloc(size, GFP_KERNEL);
70 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
74 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
76 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
77 struct net_device *real_dev = vlan->real_dev;
78 struct vlan_info *vlan_info;
79 struct vlan_group *grp;
80 u16 vlan_id = vlan->vlan_id;
84 vlan_info = rtnl_dereference(real_dev->vlan_info);
87 grp = &vlan_info->grp;
89 /* Take it out of our own structures, but be sure to interlock with
90 * HW accelerating devices or SW vlan input packet processing if
91 * VLAN is not 0 (leave it there for 802.1p).
94 vlan_vid_del(real_dev, vlan_id);
98 if (vlan->flags & VLAN_FLAG_GVRP)
99 vlan_gvrp_request_leave(dev);
101 vlan_group_set_device(grp, vlan_id, NULL);
102 /* Because unregister_netdevice_queue() makes sure at least one rcu
103 * grace period is respected before device freeing,
104 * we dont need to call synchronize_net() here.
106 unregister_netdevice_queue(dev, head);
108 if (grp->nr_vlan_devs == 0)
109 vlan_gvrp_uninit_applicant(real_dev);
111 /* Get rid of the vlan's reference to real_dev */
115 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
117 const char *name = real_dev->name;
118 const struct net_device_ops *ops = real_dev->netdev_ops;
120 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
121 pr_info("VLANs not supported on %s\n", name);
125 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
126 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
127 pr_info("Device %s has buggy VLAN hw accel\n", name);
131 if (vlan_find_dev(real_dev, vlan_id) != NULL)
137 int register_vlan_dev(struct net_device *dev)
139 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
140 struct net_device *real_dev = vlan->real_dev;
141 u16 vlan_id = vlan->vlan_id;
142 struct vlan_info *vlan_info;
143 struct vlan_group *grp;
146 err = vlan_vid_add(real_dev, vlan_id);
150 vlan_info = rtnl_dereference(real_dev->vlan_info);
151 /* vlan_info should be there now. vlan_vid_add took care of it */
154 grp = &vlan_info->grp;
155 if (grp->nr_vlan_devs == 0) {
156 err = vlan_gvrp_init_applicant(real_dev);
161 err = vlan_group_prealloc_vid(grp, vlan_id);
163 goto out_uninit_applicant;
165 err = register_netdevice(dev);
167 goto out_uninit_applicant;
169 /* Account for reference in struct vlan_dev_priv */
172 netif_stacked_transfer_operstate(real_dev, dev);
173 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
175 /* So, got the sucker initialized, now lets place
176 * it into our local structure.
178 vlan_group_set_device(grp, vlan_id, dev);
183 out_uninit_applicant:
184 if (grp->nr_vlan_devs == 0)
185 vlan_gvrp_uninit_applicant(real_dev);
187 vlan_vid_del(real_dev, vlan_id);
191 /* Attach a VLAN device to a mac address (ie Ethernet Card).
192 * Returns 0 if the device was created or a negative error code otherwise.
194 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
196 struct net_device *new_dev;
197 struct net *net = dev_net(real_dev);
198 struct vlan_net *vn = net_generic(net, vlan_net_id);
202 if (vlan_id >= VLAN_VID_MASK)
205 err = vlan_check_real_dev(real_dev, vlan_id);
209 /* Gotta set up the fields for the device. */
210 switch (vn->name_type) {
211 case VLAN_NAME_TYPE_RAW_PLUS_VID:
212 /* name will look like: eth1.0005 */
213 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
215 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
216 /* Put our vlan.VID in the name.
217 * Name will look like: vlan5
219 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
221 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
222 /* Put our vlan.VID in the name.
223 * Name will look like: eth0.5
225 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
227 case VLAN_NAME_TYPE_PLUS_VID:
228 /* Put our vlan.VID in the name.
229 * Name will look like: vlan0005
232 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
235 new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);
240 dev_net_set(new_dev, net);
241 /* need 4 bytes for extra VLAN header info,
242 * hope the underlying device can handle it.
244 new_dev->mtu = real_dev->mtu;
246 vlan_dev_priv(new_dev)->vlan_id = vlan_id;
247 vlan_dev_priv(new_dev)->real_dev = real_dev;
248 vlan_dev_priv(new_dev)->dent = NULL;
249 vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
251 new_dev->rtnl_link_ops = &vlan_link_ops;
252 err = register_vlan_dev(new_dev);
254 goto out_free_newdev;
259 free_netdev(new_dev);
263 static void vlan_sync_address(struct net_device *dev,
264 struct net_device *vlandev)
266 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
268 /* May be called without an actual change */
269 if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
272 /* vlan address was different from the old address and is equal to
274 if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
275 ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
276 dev_uc_del(dev, vlandev->dev_addr);
278 /* vlan address was equal to the old address and is different from
280 if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
281 !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
282 dev_uc_add(dev, vlandev->dev_addr);
284 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
287 static void vlan_transfer_features(struct net_device *dev,
288 struct net_device *vlandev)
290 vlandev->gso_max_size = dev->gso_max_size;
292 if (dev->features & NETIF_F_HW_VLAN_TX)
293 vlandev->hard_header_len = dev->hard_header_len;
295 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
297 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
298 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
301 netdev_update_features(vlandev);
304 static void __vlan_device_event(struct net_device *dev, unsigned long event)
307 case NETDEV_CHANGENAME:
308 vlan_proc_rem_dev(dev);
309 if (vlan_proc_add_dev(dev) < 0)
310 pr_warn("failed to change proc name for %s\n",
313 case NETDEV_REGISTER:
314 if (vlan_proc_add_dev(dev) < 0)
315 pr_warn("failed to add proc entry for %s\n", dev->name);
317 case NETDEV_UNREGISTER:
318 vlan_proc_rem_dev(dev);
323 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
326 struct net_device *dev = ptr;
327 struct vlan_group *grp;
328 struct vlan_info *vlan_info;
330 struct net_device *vlandev;
331 struct vlan_dev_priv *vlan;
334 if (is_vlan_dev(dev))
335 __vlan_device_event(dev, event);
337 if ((event == NETDEV_UP) &&
338 (dev->features & NETIF_F_HW_VLAN_FILTER)) {
339 pr_info("adding VLAN 0 to HW filter on device %s\n",
341 vlan_vid_add(dev, 0);
344 vlan_info = rtnl_dereference(dev->vlan_info);
347 grp = &vlan_info->grp;
349 /* It is OK that we do not hold the group lock right now,
350 * as we run under the RTNL lock.
355 /* Propagate real device state to vlan devices */
356 for (i = 0; i < VLAN_N_VID; i++) {
357 vlandev = vlan_group_get_device(grp, i);
361 netif_stacked_transfer_operstate(dev, vlandev);
365 case NETDEV_CHANGEADDR:
366 /* Adjust unicast filters on underlying device */
367 for (i = 0; i < VLAN_N_VID; i++) {
368 vlandev = vlan_group_get_device(grp, i);
372 flgs = vlandev->flags;
373 if (!(flgs & IFF_UP))
376 vlan_sync_address(dev, vlandev);
380 case NETDEV_CHANGEMTU:
381 for (i = 0; i < VLAN_N_VID; i++) {
382 vlandev = vlan_group_get_device(grp, i);
386 if (vlandev->mtu <= dev->mtu)
389 dev_set_mtu(vlandev, dev->mtu);
393 case NETDEV_FEAT_CHANGE:
394 /* Propagate device features to underlying device */
395 for (i = 0; i < VLAN_N_VID; i++) {
396 vlandev = vlan_group_get_device(grp, i);
400 vlan_transfer_features(dev, vlandev);
406 /* Put all VLANs for this dev in the down state too. */
407 for (i = 0; i < VLAN_N_VID; i++) {
408 vlandev = vlan_group_get_device(grp, i);
412 flgs = vlandev->flags;
413 if (!(flgs & IFF_UP))
416 vlan = vlan_dev_priv(vlandev);
417 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
418 dev_change_flags(vlandev, flgs & ~IFF_UP);
419 netif_stacked_transfer_operstate(dev, vlandev);
424 /* Put all VLANs for this dev in the up state too. */
425 for (i = 0; i < VLAN_N_VID; i++) {
426 vlandev = vlan_group_get_device(grp, i);
430 flgs = vlandev->flags;
434 vlan = vlan_dev_priv(vlandev);
435 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
436 dev_change_flags(vlandev, flgs | IFF_UP);
437 netif_stacked_transfer_operstate(dev, vlandev);
441 case NETDEV_UNREGISTER:
442 /* twiddle thumbs on netns device moves */
443 if (dev->reg_state != NETREG_UNREGISTERING)
446 for (i = 0; i < VLAN_N_VID; i++) {
447 vlandev = vlan_group_get_device(grp, i);
451 /* removal of last vid destroys vlan_info, abort
453 if (vlan_info->nr_vids == 1)
456 unregister_vlan_dev(vlandev, &list);
458 unregister_netdevice_many(&list);
461 case NETDEV_PRE_TYPE_CHANGE:
462 /* Forbid underlaying device to change its type. */
465 case NETDEV_NOTIFY_PEERS:
466 case NETDEV_BONDING_FAILOVER:
467 /* Propagate to vlan devices */
468 for (i = 0; i < VLAN_N_VID; i++) {
469 vlandev = vlan_group_get_device(grp, i);
473 call_netdevice_notifiers(event, vlandev);
482 static struct notifier_block vlan_notifier_block __read_mostly = {
483 .notifier_call = vlan_device_event,
487 * VLAN IOCTL handler.
488 * o execute requested action or pass command to the device driver
489 * arg is really a struct vlan_ioctl_args __user *.
491 static int vlan_ioctl_handler(struct net *net, void __user *arg)
494 struct vlan_ioctl_args args;
495 struct net_device *dev = NULL;
497 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
500 /* Null terminate this sucker, just in case. */
501 args.device1[23] = 0;
502 args.u.device2[23] = 0;
507 case SET_VLAN_INGRESS_PRIORITY_CMD:
508 case SET_VLAN_EGRESS_PRIORITY_CMD:
509 case SET_VLAN_FLAG_CMD:
512 case GET_VLAN_REALDEV_NAME_CMD:
513 case GET_VLAN_VID_CMD:
515 dev = __dev_get_by_name(net, args.device1);
520 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
525 case SET_VLAN_INGRESS_PRIORITY_CMD:
527 if (!capable(CAP_NET_ADMIN))
529 vlan_dev_set_ingress_priority(dev,
535 case SET_VLAN_EGRESS_PRIORITY_CMD:
537 if (!capable(CAP_NET_ADMIN))
539 err = vlan_dev_set_egress_priority(dev,
544 case SET_VLAN_FLAG_CMD:
546 if (!capable(CAP_NET_ADMIN))
548 err = vlan_dev_change_flags(dev,
549 args.vlan_qos ? args.u.flag : 0,
553 case SET_VLAN_NAME_TYPE_CMD:
555 if (!capable(CAP_NET_ADMIN))
557 if ((args.u.name_type >= 0) &&
558 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
561 vn = net_generic(net, vlan_net_id);
562 vn->name_type = args.u.name_type;
571 if (!capable(CAP_NET_ADMIN))
573 err = register_vlan_device(dev, args.u.VID);
578 if (!capable(CAP_NET_ADMIN))
580 unregister_vlan_dev(dev, NULL);
584 case GET_VLAN_REALDEV_NAME_CMD:
586 vlan_dev_get_realdev_name(dev, args.u.device2);
587 if (copy_to_user(arg, &args,
588 sizeof(struct vlan_ioctl_args)))
592 case GET_VLAN_VID_CMD:
594 args.u.VID = vlan_dev_vlan_id(dev);
595 if (copy_to_user(arg, &args,
596 sizeof(struct vlan_ioctl_args)))
609 static int __net_init vlan_init_net(struct net *net)
611 struct vlan_net *vn = net_generic(net, vlan_net_id);
614 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
616 err = vlan_proc_init(net);
621 static void __net_exit vlan_exit_net(struct net *net)
623 vlan_proc_cleanup(net);
626 static struct pernet_operations vlan_net_ops = {
627 .init = vlan_init_net,
628 .exit = vlan_exit_net,
630 .size = sizeof(struct vlan_net),
633 static int __init vlan_proto_init(void)
637 pr_info("%s v%s\n", vlan_fullname, vlan_version);
639 err = register_pernet_subsys(&vlan_net_ops);
643 err = register_netdevice_notifier(&vlan_notifier_block);
647 err = vlan_gvrp_init();
651 err = vlan_netlink_init();
655 vlan_ioctl_set(vlan_ioctl_handler);
661 unregister_netdevice_notifier(&vlan_notifier_block);
663 unregister_pernet_subsys(&vlan_net_ops);
668 static void __exit vlan_cleanup_module(void)
670 vlan_ioctl_set(NULL);
673 unregister_netdevice_notifier(&vlan_notifier_block);
675 unregister_pernet_subsys(&vlan_net_ops);
676 rcu_barrier(); /* Wait for completion of call_rcu()'s */
681 module_init(vlan_proto_init);
682 module_exit(vlan_cleanup_module);
684 MODULE_LICENSE("GPL");
685 MODULE_VERSION(DRV_VERSION);