2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
9 * The code this is based on carried the following copyright notice:
11 * (C) Copyright 2001-2006
12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
13 * Re-worked by Ben Greear <greearb@candelatech.com>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/errno.h>
21 #include <linux/slab.h>
22 #include <linux/string.h>
23 #include <linux/rculist.h>
24 #include <linux/notifier.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ethtool.h>
28 #include <linux/if_arp.h>
29 #include <linux/if_link.h>
30 #include <linux/if_macvlan.h>
31 #include <net/rtnetlink.h>
34 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
37 struct net_device *dev;
38 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
39 struct list_head vlans;
43 #define macvlan_port_get_rcu(dev) \
44 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
45 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
46 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
48 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
49 const unsigned char *addr)
51 struct macvlan_dev *vlan;
54 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
55 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
61 static void macvlan_hash_add(struct macvlan_dev *vlan)
63 struct macvlan_port *port = vlan->port;
64 const unsigned char *addr = vlan->dev->dev_addr;
66 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
69 static void macvlan_hash_del(struct macvlan_dev *vlan)
71 hlist_del_rcu(&vlan->hlist);
75 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
76 const unsigned char *addr)
78 macvlan_hash_del(vlan);
79 /* Now that we are unhashed it is safe to change the device
80 * address without confusing packet delivery.
82 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
83 macvlan_hash_add(vlan);
86 static int macvlan_addr_busy(const struct macvlan_port *port,
87 const unsigned char *addr)
89 /* Test to see if the specified multicast address is
90 * currently in use by the underlying device or
93 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
96 if (macvlan_hash_lookup(port, addr))
103 static int macvlan_broadcast_one(struct sk_buff *skb,
104 const struct macvlan_dev *vlan,
105 const struct ethhdr *eth, bool local)
107 struct net_device *dev = vlan->dev;
112 return vlan->forward(dev, skb);
115 if (!compare_ether_addr_64bits(eth->h_dest,
117 skb->pkt_type = PACKET_BROADCAST;
119 skb->pkt_type = PACKET_MULTICAST;
121 return vlan->receive(skb);
124 static void macvlan_broadcast(struct sk_buff *skb,
125 const struct macvlan_port *port,
126 struct net_device *src,
127 enum macvlan_mode mode)
129 const struct ethhdr *eth = eth_hdr(skb);
130 const struct macvlan_dev *vlan;
131 struct hlist_node *n;
132 struct sk_buff *nskb;
136 if (skb->protocol == htons(ETH_P_PAUSE))
139 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
140 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
141 if (vlan->dev == src || !(vlan->mode & mode))
144 nskb = skb_clone(skb, GFP_ATOMIC);
145 err = macvlan_broadcast_one(nskb, vlan, eth,
146 mode == MACVLAN_MODE_BRIDGE);
147 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
148 err == NET_RX_SUCCESS, 1);
153 /* called under rcu_read_lock() from netif_receive_skb */
154 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
156 struct macvlan_port *port;
157 const struct ethhdr *eth = eth_hdr(skb);
158 const struct macvlan_dev *vlan;
159 const struct macvlan_dev *src;
160 struct net_device *dev;
163 port = macvlan_port_get_rcu(skb->dev);
164 if (is_multicast_ether_addr(eth->h_dest)) {
165 src = macvlan_hash_lookup(port, eth->h_source);
167 /* frame comes from an external address */
168 macvlan_broadcast(skb, port, NULL,
169 MACVLAN_MODE_PRIVATE |
171 MACVLAN_MODE_BRIDGE);
172 else if (src->mode == MACVLAN_MODE_VEPA)
173 /* flood to everyone except source */
174 macvlan_broadcast(skb, port, src->dev,
176 MACVLAN_MODE_BRIDGE);
177 else if (src->mode == MACVLAN_MODE_BRIDGE)
179 * flood only to VEPA ports, bridge ports
180 * already saw the frame on the way out.
182 macvlan_broadcast(skb, port, src->dev,
187 vlan = macvlan_hash_lookup(port, eth->h_dest);
192 if (unlikely(!(dev->flags & IFF_UP))) {
196 len = skb->len + ETH_HLEN;
197 skb = skb_share_check(skb, GFP_ATOMIC);
198 macvlan_count_rx(vlan, len, skb != NULL, 0);
203 skb->pkt_type = PACKET_HOST;
209 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
211 const struct macvlan_dev *vlan = netdev_priv(dev);
212 const struct macvlan_port *port = vlan->port;
213 const struct macvlan_dev *dest;
215 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
216 const struct ethhdr *eth = (void *)skb->data;
218 /* send to other bridge ports directly */
219 if (is_multicast_ether_addr(eth->h_dest)) {
220 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
224 dest = macvlan_hash_lookup(port, eth->h_dest);
225 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
226 unsigned int length = skb->len + ETH_HLEN;
227 int ret = dest->forward(dest->dev, skb);
228 macvlan_count_rx(dest, length,
229 ret == NET_RX_SUCCESS, 0);
231 return NET_XMIT_SUCCESS;
236 skb_set_dev(skb, vlan->lowerdev);
237 return dev_queue_xmit(skb);
240 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
241 struct net_device *dev)
243 int i = skb_get_queue_mapping(skb);
244 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
245 unsigned int len = skb->len;
248 ret = macvlan_queue_xmit(skb, dev);
249 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
251 txq->tx_bytes += len;
257 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
259 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
260 unsigned short type, const void *daddr,
261 const void *saddr, unsigned len)
263 const struct macvlan_dev *vlan = netdev_priv(dev);
264 struct net_device *lowerdev = vlan->lowerdev;
266 return dev_hard_header(skb, lowerdev, type, daddr,
267 saddr ? : dev->dev_addr, len);
270 static const struct header_ops macvlan_hard_header_ops = {
271 .create = macvlan_hard_header,
272 .rebuild = eth_rebuild_header,
273 .parse = eth_header_parse,
274 .cache = eth_header_cache,
275 .cache_update = eth_header_cache_update,
278 static int macvlan_open(struct net_device *dev)
280 struct macvlan_dev *vlan = netdev_priv(dev);
281 struct net_device *lowerdev = vlan->lowerdev;
285 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
288 err = dev_uc_add(lowerdev, dev->dev_addr);
291 if (dev->flags & IFF_ALLMULTI) {
292 err = dev_set_allmulti(lowerdev, 1);
296 macvlan_hash_add(vlan);
300 dev_uc_del(lowerdev, dev->dev_addr);
305 static int macvlan_stop(struct net_device *dev)
307 struct macvlan_dev *vlan = netdev_priv(dev);
308 struct net_device *lowerdev = vlan->lowerdev;
310 dev_mc_unsync(lowerdev, dev);
311 if (dev->flags & IFF_ALLMULTI)
312 dev_set_allmulti(lowerdev, -1);
314 dev_uc_del(lowerdev, dev->dev_addr);
316 macvlan_hash_del(vlan);
320 static int macvlan_set_mac_address(struct net_device *dev, void *p)
322 struct macvlan_dev *vlan = netdev_priv(dev);
323 struct net_device *lowerdev = vlan->lowerdev;
324 struct sockaddr *addr = p;
327 if (!is_valid_ether_addr(addr->sa_data))
328 return -EADDRNOTAVAIL;
330 if (!(dev->flags & IFF_UP)) {
331 /* Just copy in the new address */
332 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
334 /* Rehash and update the device filters */
335 if (macvlan_addr_busy(vlan->port, addr->sa_data))
338 err = dev_uc_add(lowerdev, addr->sa_data);
342 dev_uc_del(lowerdev, dev->dev_addr);
344 macvlan_hash_change_addr(vlan, addr->sa_data);
349 static void macvlan_change_rx_flags(struct net_device *dev, int change)
351 struct macvlan_dev *vlan = netdev_priv(dev);
352 struct net_device *lowerdev = vlan->lowerdev;
354 if (change & IFF_ALLMULTI)
355 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
358 static void macvlan_set_multicast_list(struct net_device *dev)
360 struct macvlan_dev *vlan = netdev_priv(dev);
362 dev_mc_sync(vlan->lowerdev, dev);
365 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
367 struct macvlan_dev *vlan = netdev_priv(dev);
369 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
376 * macvlan network devices have devices nesting below it and are a special
377 * "super class" of normal network devices; split their locks off into a
378 * separate class since they always nest.
380 static struct lock_class_key macvlan_netdev_xmit_lock_key;
381 static struct lock_class_key macvlan_netdev_addr_lock_key;
383 #define MACVLAN_FEATURES \
384 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
385 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
386 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO)
388 #define MACVLAN_STATE_MASK \
389 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
391 static void macvlan_set_lockdep_class_one(struct net_device *dev,
392 struct netdev_queue *txq,
395 lockdep_set_class(&txq->_xmit_lock,
396 &macvlan_netdev_xmit_lock_key);
399 static void macvlan_set_lockdep_class(struct net_device *dev)
401 lockdep_set_class(&dev->addr_list_lock,
402 &macvlan_netdev_addr_lock_key);
403 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
406 static int macvlan_init(struct net_device *dev)
408 struct macvlan_dev *vlan = netdev_priv(dev);
409 const struct net_device *lowerdev = vlan->lowerdev;
411 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
412 (lowerdev->state & MACVLAN_STATE_MASK);
413 dev->features = lowerdev->features & MACVLAN_FEATURES;
414 dev->gso_max_size = lowerdev->gso_max_size;
415 dev->iflink = lowerdev->ifindex;
416 dev->hard_header_len = lowerdev->hard_header_len;
418 macvlan_set_lockdep_class(dev);
420 vlan->rx_stats = alloc_percpu(struct macvlan_rx_stats);
427 static void macvlan_uninit(struct net_device *dev)
429 struct macvlan_dev *vlan = netdev_priv(dev);
431 free_percpu(vlan->rx_stats);
434 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
435 struct rtnl_link_stats64 *stats)
437 struct macvlan_dev *vlan = netdev_priv(dev);
439 dev_txq_stats_fold(dev, stats);
441 if (vlan->rx_stats) {
442 struct macvlan_rx_stats *p, accum = {0};
443 u64 rx_packets, rx_bytes, rx_multicast;
447 for_each_possible_cpu(i) {
448 p = per_cpu_ptr(vlan->rx_stats, i);
450 start = u64_stats_fetch_begin_bh(&p->syncp);
451 rx_packets = p->rx_packets;
452 rx_bytes = p->rx_bytes;
453 rx_multicast = p->rx_multicast;
454 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
455 accum.rx_packets += rx_packets;
456 accum.rx_bytes += rx_bytes;
457 accum.rx_multicast += rx_multicast;
458 /* rx_errors is an ulong, updated without syncp protection */
459 accum.rx_errors += p->rx_errors;
461 stats->rx_packets = accum.rx_packets;
462 stats->rx_bytes = accum.rx_bytes;
463 stats->rx_errors = accum.rx_errors;
464 stats->rx_dropped = accum.rx_errors;
465 stats->multicast = accum.rx_multicast;
470 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
471 struct ethtool_drvinfo *drvinfo)
473 snprintf(drvinfo->driver, 32, "macvlan");
474 snprintf(drvinfo->version, 32, "0.1");
477 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
479 const struct macvlan_dev *vlan = netdev_priv(dev);
480 return dev_ethtool_get_rx_csum(vlan->lowerdev);
483 static int macvlan_ethtool_get_settings(struct net_device *dev,
484 struct ethtool_cmd *cmd)
486 const struct macvlan_dev *vlan = netdev_priv(dev);
487 return dev_ethtool_get_settings(vlan->lowerdev, cmd);
490 static u32 macvlan_ethtool_get_flags(struct net_device *dev)
492 const struct macvlan_dev *vlan = netdev_priv(dev);
493 return dev_ethtool_get_flags(vlan->lowerdev);
496 static const struct ethtool_ops macvlan_ethtool_ops = {
497 .get_link = ethtool_op_get_link,
498 .get_settings = macvlan_ethtool_get_settings,
499 .get_rx_csum = macvlan_ethtool_get_rx_csum,
500 .get_drvinfo = macvlan_ethtool_get_drvinfo,
501 .get_flags = macvlan_ethtool_get_flags,
504 static const struct net_device_ops macvlan_netdev_ops = {
505 .ndo_init = macvlan_init,
506 .ndo_uninit = macvlan_uninit,
507 .ndo_open = macvlan_open,
508 .ndo_stop = macvlan_stop,
509 .ndo_start_xmit = macvlan_start_xmit,
510 .ndo_change_mtu = macvlan_change_mtu,
511 .ndo_change_rx_flags = macvlan_change_rx_flags,
512 .ndo_set_mac_address = macvlan_set_mac_address,
513 .ndo_set_multicast_list = macvlan_set_multicast_list,
514 .ndo_get_stats64 = macvlan_dev_get_stats64,
515 .ndo_validate_addr = eth_validate_addr,
518 static void macvlan_setup(struct net_device *dev)
522 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
523 dev->netdev_ops = &macvlan_netdev_ops;
524 dev->destructor = free_netdev;
525 dev->header_ops = &macvlan_hard_header_ops,
526 dev->ethtool_ops = &macvlan_ethtool_ops;
527 dev->tx_queue_len = 0;
530 static int macvlan_port_create(struct net_device *dev)
532 struct macvlan_port *port;
536 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
539 port = kzalloc(sizeof(*port), GFP_KERNEL);
544 INIT_LIST_HEAD(&port->vlans);
545 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
546 INIT_HLIST_HEAD(&port->vlan_hash[i]);
548 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
552 dev->priv_flags |= IFF_MACVLAN_PORT;
556 static void macvlan_port_rcu_free(struct rcu_head *head)
558 struct macvlan_port *port;
560 port = container_of(head, struct macvlan_port, rcu);
564 static void macvlan_port_destroy(struct net_device *dev)
566 struct macvlan_port *port = macvlan_port_get(dev);
568 dev->priv_flags &= ~IFF_MACVLAN_PORT;
569 netdev_rx_handler_unregister(dev);
570 call_rcu(&port->rcu, macvlan_port_rcu_free);
573 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
575 if (tb[IFLA_ADDRESS]) {
576 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
578 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
579 return -EADDRNOTAVAIL;
582 if (data && data[IFLA_MACVLAN_MODE]) {
583 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
584 case MACVLAN_MODE_PRIVATE:
585 case MACVLAN_MODE_VEPA:
586 case MACVLAN_MODE_BRIDGE:
595 static int macvlan_get_tx_queues(struct net *net,
597 unsigned int *num_tx_queues,
598 unsigned int *real_num_tx_queues)
600 struct net_device *real_dev;
605 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
609 *num_tx_queues = real_dev->num_tx_queues;
610 *real_num_tx_queues = real_dev->real_num_tx_queues;
614 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
615 struct nlattr *tb[], struct nlattr *data[],
616 int (*receive)(struct sk_buff *skb),
617 int (*forward)(struct net_device *dev,
618 struct sk_buff *skb))
620 struct macvlan_dev *vlan = netdev_priv(dev);
621 struct macvlan_port *port;
622 struct net_device *lowerdev;
628 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
629 if (lowerdev == NULL)
632 /* When creating macvlans on top of other macvlans - use
633 * the real device as the lowerdev.
635 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
636 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
637 lowerdev = lowervlan->lowerdev;
641 dev->mtu = lowerdev->mtu;
642 else if (dev->mtu > lowerdev->mtu)
645 if (!tb[IFLA_ADDRESS])
646 random_ether_addr(dev->dev_addr);
648 if (!macvlan_port_exists(lowerdev)) {
649 err = macvlan_port_create(lowerdev);
653 port = macvlan_port_get(lowerdev);
655 vlan->lowerdev = lowerdev;
658 vlan->receive = receive;
659 vlan->forward = forward;
661 vlan->mode = MACVLAN_MODE_VEPA;
662 if (data && data[IFLA_MACVLAN_MODE])
663 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
665 err = register_netdevice(dev);
669 list_add_tail(&vlan->list, &port->vlans);
670 netif_stacked_transfer_operstate(lowerdev, dev);
675 if (list_empty(&port->vlans))
676 macvlan_port_destroy(lowerdev);
680 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
682 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
683 struct nlattr *tb[], struct nlattr *data[])
685 return macvlan_common_newlink(src_net, dev, tb, data,
690 void macvlan_dellink(struct net_device *dev, struct list_head *head)
692 struct macvlan_dev *vlan = netdev_priv(dev);
693 struct macvlan_port *port = vlan->port;
695 list_del(&vlan->list);
696 unregister_netdevice_queue(dev, head);
698 if (list_empty(&port->vlans))
699 macvlan_port_destroy(port->dev);
701 EXPORT_SYMBOL_GPL(macvlan_dellink);
703 static int macvlan_changelink(struct net_device *dev,
704 struct nlattr *tb[], struct nlattr *data[])
706 struct macvlan_dev *vlan = netdev_priv(dev);
707 if (data && data[IFLA_MACVLAN_MODE])
708 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
712 static size_t macvlan_get_size(const struct net_device *dev)
714 return nla_total_size(4);
717 static int macvlan_fill_info(struct sk_buff *skb,
718 const struct net_device *dev)
720 struct macvlan_dev *vlan = netdev_priv(dev);
722 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
729 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
730 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
733 int macvlan_link_register(struct rtnl_link_ops *ops)
736 ops->priv_size = sizeof(struct macvlan_dev);
737 ops->get_tx_queues = macvlan_get_tx_queues;
738 ops->setup = macvlan_setup;
739 ops->validate = macvlan_validate;
740 ops->maxtype = IFLA_MACVLAN_MAX;
741 ops->policy = macvlan_policy;
742 ops->changelink = macvlan_changelink;
743 ops->get_size = macvlan_get_size;
744 ops->fill_info = macvlan_fill_info;
746 return rtnl_link_register(ops);
748 EXPORT_SYMBOL_GPL(macvlan_link_register);
750 static struct rtnl_link_ops macvlan_link_ops = {
752 .newlink = macvlan_newlink,
753 .dellink = macvlan_dellink,
756 static int macvlan_device_event(struct notifier_block *unused,
757 unsigned long event, void *ptr)
759 struct net_device *dev = ptr;
760 struct macvlan_dev *vlan, *next;
761 struct macvlan_port *port;
763 if (!macvlan_port_exists(dev))
766 port = macvlan_port_get(dev);
770 list_for_each_entry(vlan, &port->vlans, list)
771 netif_stacked_transfer_operstate(vlan->lowerdev,
774 case NETDEV_FEAT_CHANGE:
775 list_for_each_entry(vlan, &port->vlans, list) {
776 vlan->dev->features = dev->features & MACVLAN_FEATURES;
777 vlan->dev->gso_max_size = dev->gso_max_size;
778 netdev_features_change(vlan->dev);
781 case NETDEV_UNREGISTER:
782 list_for_each_entry_safe(vlan, next, &port->vlans, list)
783 vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
785 case NETDEV_PRE_TYPE_CHANGE:
786 /* Forbid underlaying device to change its type. */
792 static struct notifier_block macvlan_notifier_block __read_mostly = {
793 .notifier_call = macvlan_device_event,
796 static int __init macvlan_init_module(void)
800 register_netdevice_notifier(&macvlan_notifier_block);
802 err = macvlan_link_register(&macvlan_link_ops);
807 unregister_netdevice_notifier(&macvlan_notifier_block);
811 static void __exit macvlan_cleanup_module(void)
813 rtnl_link_unregister(&macvlan_link_ops);
814 unregister_netdevice_notifier(&macvlan_notifier_block);
817 module_init(macvlan_init_module);
818 module_exit(macvlan_cleanup_module);
820 MODULE_LICENSE("GPL");
821 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
822 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
823 MODULE_ALIAS_RTNL_LINK("macvlan");