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 static struct packet_type vlan_packet_type __read_mostly = {
53 .type = cpu_to_be16(ETH_P_8021Q),
54 .func = vlan_skb_recv, /* VLAN receive method */
57 /* End of global variables definitions. */
59 static void vlan_group_free(struct vlan_group *grp)
63 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
64 kfree(grp->vlan_devices_arrays[i]);
68 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
70 struct vlan_group *grp;
72 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
76 grp->real_dev = real_dev;
80 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
82 struct net_device **array;
87 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
91 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
92 array = kzalloc(size, GFP_KERNEL);
96 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
100 static void vlan_rcu_free(struct rcu_head *rcu)
102 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
105 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
107 struct vlan_dev_info *vlan = vlan_dev_info(dev);
108 struct net_device *real_dev = vlan->real_dev;
109 const struct net_device_ops *ops = real_dev->netdev_ops;
110 struct vlan_group *grp;
111 u16 vlan_id = vlan->vlan_id;
115 grp = rtnl_dereference(real_dev->vlgrp);
118 /* Take it out of our own structures, but be sure to interlock with
119 * HW accelerating devices or SW vlan input packet processing if
120 * VLAN is not 0 (leave it there for 802.1p).
122 if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
123 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
127 vlan_group_set_device(grp, vlan_id, NULL);
131 unregister_netdevice_queue(dev, head);
133 /* If the group is now empty, kill off the group. */
134 if (grp->nr_vlans == 0) {
135 vlan_gvrp_uninit_applicant(real_dev);
137 rcu_assign_pointer(real_dev->vlgrp, NULL);
138 if (ops->ndo_vlan_rx_register)
139 ops->ndo_vlan_rx_register(real_dev, NULL);
141 /* Free the group, after all cpu's are done. */
142 call_rcu(&grp->rcu, vlan_rcu_free);
145 /* Get rid of the vlan's reference to real_dev */
149 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
151 const char *name = real_dev->name;
152 const struct net_device_ops *ops = real_dev->netdev_ops;
154 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
155 pr_info("8021q: VLANs not supported on %s\n", name);
159 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
160 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
161 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
165 if (vlan_find_dev(real_dev, vlan_id) != NULL)
171 int register_vlan_dev(struct net_device *dev)
173 struct vlan_dev_info *vlan = vlan_dev_info(dev);
174 struct net_device *real_dev = vlan->real_dev;
175 const struct net_device_ops *ops = real_dev->netdev_ops;
176 u16 vlan_id = vlan->vlan_id;
177 struct vlan_group *grp, *ngrp = NULL;
180 grp = rtnl_dereference(real_dev->vlgrp);
182 ngrp = grp = vlan_group_alloc(real_dev);
185 err = vlan_gvrp_init_applicant(real_dev);
190 err = vlan_group_prealloc_vid(grp, vlan_id);
192 goto out_uninit_applicant;
194 err = register_netdevice(dev);
196 goto out_uninit_applicant;
198 /* Account for reference in struct vlan_dev_info */
201 netif_stacked_transfer_operstate(real_dev, dev);
202 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
204 /* So, got the sucker initialized, now lets place
205 * it into our local structure.
207 vlan_group_set_device(grp, vlan_id, dev);
211 if (ops->ndo_vlan_rx_register)
212 ops->ndo_vlan_rx_register(real_dev, ngrp);
213 rcu_assign_pointer(real_dev->vlgrp, ngrp);
215 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
216 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
220 out_uninit_applicant:
222 vlan_gvrp_uninit_applicant(real_dev);
225 /* Free the group, after all cpu's are done. */
226 call_rcu(&ngrp->rcu, vlan_rcu_free);
231 /* Attach a VLAN device to a mac address (ie Ethernet Card).
232 * Returns 0 if the device was created or a negative error code otherwise.
234 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
236 struct net_device *new_dev;
237 struct net *net = dev_net(real_dev);
238 struct vlan_net *vn = net_generic(net, vlan_net_id);
242 if (vlan_id >= VLAN_VID_MASK)
245 err = vlan_check_real_dev(real_dev, vlan_id);
249 /* Gotta set up the fields for the device. */
250 switch (vn->name_type) {
251 case VLAN_NAME_TYPE_RAW_PLUS_VID:
252 /* name will look like: eth1.0005 */
253 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
255 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
256 /* Put our vlan.VID in the name.
257 * Name will look like: vlan5
259 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
261 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
262 /* Put our vlan.VID in the name.
263 * Name will look like: eth0.5
265 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
267 case VLAN_NAME_TYPE_PLUS_VID:
268 /* Put our vlan.VID in the name.
269 * Name will look like: vlan0005
272 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
275 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, vlan_setup);
280 dev_net_set(new_dev, net);
281 /* need 4 bytes for extra VLAN header info,
282 * hope the underlying device can handle it.
284 new_dev->mtu = real_dev->mtu;
286 vlan_dev_info(new_dev)->vlan_id = vlan_id;
287 vlan_dev_info(new_dev)->real_dev = real_dev;
288 vlan_dev_info(new_dev)->dent = NULL;
289 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
291 new_dev->rtnl_link_ops = &vlan_link_ops;
292 err = register_vlan_dev(new_dev);
294 goto out_free_newdev;
299 free_netdev(new_dev);
303 static void vlan_sync_address(struct net_device *dev,
304 struct net_device *vlandev)
306 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
308 /* May be called without an actual change */
309 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
312 /* vlan address was different from the old address and is equal to
314 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
315 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
316 dev_uc_del(dev, vlandev->dev_addr);
318 /* vlan address was equal to the old address and is different from
320 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
321 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
322 dev_uc_add(dev, vlandev->dev_addr);
324 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
327 static void vlan_transfer_features(struct net_device *dev,
328 struct net_device *vlandev)
330 unsigned long old_features = vlandev->features;
332 vlandev->features &= ~dev->vlan_features;
333 vlandev->features |= dev->features & dev->vlan_features;
334 vlandev->gso_max_size = dev->gso_max_size;
336 if (dev->features & NETIF_F_HW_VLAN_TX)
337 vlandev->hard_header_len = dev->hard_header_len;
339 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
341 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
342 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
344 if (old_features != vlandev->features)
345 netdev_features_change(vlandev);
348 static void __vlan_device_event(struct net_device *dev, unsigned long event)
351 case NETDEV_CHANGENAME:
352 vlan_proc_rem_dev(dev);
353 if (vlan_proc_add_dev(dev) < 0)
354 pr_warning("8021q: failed to change proc name for %s\n",
357 case NETDEV_REGISTER:
358 if (vlan_proc_add_dev(dev) < 0)
359 pr_warning("8021q: failed to add proc entry for %s\n",
362 case NETDEV_UNREGISTER:
363 vlan_proc_rem_dev(dev);
368 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
371 struct net_device *dev = ptr;
372 struct vlan_group *grp;
374 struct net_device *vlandev;
375 struct vlan_dev_info *vlan;
378 if (is_vlan_dev(dev))
379 __vlan_device_event(dev, event);
381 if ((event == NETDEV_UP) &&
382 (dev->features & NETIF_F_HW_VLAN_FILTER) &&
383 dev->netdev_ops->ndo_vlan_rx_add_vid) {
384 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
386 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
389 grp = rtnl_dereference(dev->vlgrp);
393 /* It is OK that we do not hold the group lock right now,
394 * as we run under the RTNL lock.
399 /* Propagate real device state to vlan devices */
400 for (i = 0; i < VLAN_N_VID; i++) {
401 vlandev = vlan_group_get_device(grp, i);
405 netif_stacked_transfer_operstate(dev, vlandev);
409 case NETDEV_CHANGEADDR:
410 /* Adjust unicast filters on underlying device */
411 for (i = 0; i < VLAN_N_VID; i++) {
412 vlandev = vlan_group_get_device(grp, i);
416 flgs = vlandev->flags;
417 if (!(flgs & IFF_UP))
420 vlan_sync_address(dev, vlandev);
424 case NETDEV_CHANGEMTU:
425 for (i = 0; i < VLAN_N_VID; i++) {
426 vlandev = vlan_group_get_device(grp, i);
430 if (vlandev->mtu <= dev->mtu)
433 dev_set_mtu(vlandev, dev->mtu);
437 case NETDEV_FEAT_CHANGE:
438 /* Propagate device features to underlying device */
439 for (i = 0; i < VLAN_N_VID; i++) {
440 vlandev = vlan_group_get_device(grp, i);
444 vlan_transfer_features(dev, vlandev);
450 /* Put all VLANs for this dev in the down state too. */
451 for (i = 0; i < VLAN_N_VID; i++) {
452 vlandev = vlan_group_get_device(grp, i);
456 flgs = vlandev->flags;
457 if (!(flgs & IFF_UP))
460 vlan = vlan_dev_info(vlandev);
461 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
462 dev_change_flags(vlandev, flgs & ~IFF_UP);
463 netif_stacked_transfer_operstate(dev, vlandev);
468 /* Put all VLANs for this dev in the up state too. */
469 for (i = 0; i < VLAN_N_VID; i++) {
470 vlandev = vlan_group_get_device(grp, i);
474 flgs = vlandev->flags;
478 vlan = vlan_dev_info(vlandev);
479 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
480 dev_change_flags(vlandev, flgs | IFF_UP);
481 netif_stacked_transfer_operstate(dev, vlandev);
485 case NETDEV_UNREGISTER:
486 /* twiddle thumbs on netns device moves */
487 if (dev->reg_state != NETREG_UNREGISTERING)
490 /* Delete all VLANs for this dev. */
493 for (i = 0; i < VLAN_N_VID; i++) {
494 vlandev = vlan_group_get_device(grp, i);
498 /* unregistration of last vlan destroys group, abort
500 if (grp->nr_vlans == 1)
503 unregister_vlan_dev(vlandev, &list);
505 unregister_netdevice_many(&list);
508 case NETDEV_PRE_TYPE_CHANGE:
509 /* Forbid underlaying device to change its type. */
517 static struct notifier_block vlan_notifier_block __read_mostly = {
518 .notifier_call = vlan_device_event,
522 * VLAN IOCTL handler.
523 * o execute requested action or pass command to the device driver
524 * arg is really a struct vlan_ioctl_args __user *.
526 static int vlan_ioctl_handler(struct net *net, void __user *arg)
529 struct vlan_ioctl_args args;
530 struct net_device *dev = NULL;
532 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
535 /* Null terminate this sucker, just in case. */
536 args.device1[23] = 0;
537 args.u.device2[23] = 0;
542 case SET_VLAN_INGRESS_PRIORITY_CMD:
543 case SET_VLAN_EGRESS_PRIORITY_CMD:
544 case SET_VLAN_FLAG_CMD:
547 case GET_VLAN_REALDEV_NAME_CMD:
548 case GET_VLAN_VID_CMD:
550 dev = __dev_get_by_name(net, args.device1);
555 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
560 case SET_VLAN_INGRESS_PRIORITY_CMD:
562 if (!capable(CAP_NET_ADMIN))
564 vlan_dev_set_ingress_priority(dev,
570 case SET_VLAN_EGRESS_PRIORITY_CMD:
572 if (!capable(CAP_NET_ADMIN))
574 err = vlan_dev_set_egress_priority(dev,
579 case SET_VLAN_FLAG_CMD:
581 if (!capable(CAP_NET_ADMIN))
583 err = vlan_dev_change_flags(dev,
584 args.vlan_qos ? args.u.flag : 0,
588 case SET_VLAN_NAME_TYPE_CMD:
590 if (!capable(CAP_NET_ADMIN))
592 if ((args.u.name_type >= 0) &&
593 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
596 vn = net_generic(net, vlan_net_id);
597 vn->name_type = args.u.name_type;
606 if (!capable(CAP_NET_ADMIN))
608 err = register_vlan_device(dev, args.u.VID);
613 if (!capable(CAP_NET_ADMIN))
615 unregister_vlan_dev(dev, NULL);
619 case GET_VLAN_REALDEV_NAME_CMD:
621 vlan_dev_get_realdev_name(dev, args.u.device2);
622 if (copy_to_user(arg, &args,
623 sizeof(struct vlan_ioctl_args)))
627 case GET_VLAN_VID_CMD:
629 args.u.VID = vlan_dev_vlan_id(dev);
630 if (copy_to_user(arg, &args,
631 sizeof(struct vlan_ioctl_args)))
644 static int __net_init vlan_init_net(struct net *net)
646 struct vlan_net *vn = net_generic(net, vlan_net_id);
649 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
651 err = vlan_proc_init(net);
656 static void __net_exit vlan_exit_net(struct net *net)
658 vlan_proc_cleanup(net);
661 static struct pernet_operations vlan_net_ops = {
662 .init = vlan_init_net,
663 .exit = vlan_exit_net,
665 .size = sizeof(struct vlan_net),
668 static int __init vlan_proto_init(void)
672 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
673 pr_info("All bugs added by %s\n", vlan_buggyright);
675 err = register_pernet_subsys(&vlan_net_ops);
679 err = register_netdevice_notifier(&vlan_notifier_block);
683 err = vlan_gvrp_init();
687 err = vlan_netlink_init();
691 dev_add_pack(&vlan_packet_type);
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 dev_remove_pack(&vlan_packet_type);
714 unregister_pernet_subsys(&vlan_net_ops);
715 rcu_barrier(); /* Wait for completion of call_rcu()'s */
720 module_init(vlan_proto_init);
721 module_exit(vlan_cleanup_module);
723 MODULE_LICENSE("GPL");
724 MODULE_VERSION(DRV_VERSION);