x86/PCI: truncate _CRS windows with _LEN > _MAX - _MIN + 1
[linux-2.6.git] / drivers / net / macvlan.c
1 /*
2  * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
3  *
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.
8  *
9  * The code this is based on carried the following copyright notice:
10  * ---
11  * (C) Copyright 2001-2006
12  * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
13  * Re-worked by Ben Greear <greearb@candelatech.com>
14  * ---
15  */
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>
32 #include <net/xfrm.h>
33
34 #define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
35
36 struct macvlan_port {
37         struct net_device       *dev;
38         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
39         struct list_head        vlans;
40 };
41
42 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
43                                                const unsigned char *addr)
44 {
45         struct macvlan_dev *vlan;
46         struct hlist_node *n;
47
48         hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
49                 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
50                         return vlan;
51         }
52         return NULL;
53 }
54
55 static void macvlan_hash_add(struct macvlan_dev *vlan)
56 {
57         struct macvlan_port *port = vlan->port;
58         const unsigned char *addr = vlan->dev->dev_addr;
59
60         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
61 }
62
63 static void macvlan_hash_del(struct macvlan_dev *vlan)
64 {
65         hlist_del_rcu(&vlan->hlist);
66         synchronize_rcu();
67 }
68
69 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
70                                         const unsigned char *addr)
71 {
72         macvlan_hash_del(vlan);
73         /* Now that we are unhashed it is safe to change the device
74          * address without confusing packet delivery.
75          */
76         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
77         macvlan_hash_add(vlan);
78 }
79
80 static int macvlan_addr_busy(const struct macvlan_port *port,
81                                 const unsigned char *addr)
82 {
83         /* Test to see if the specified multicast address is
84          * currently in use by the underlying device or
85          * another macvlan.
86          */
87         if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
88                 return 1;
89
90         if (macvlan_hash_lookup(port, addr))
91                 return 1;
92
93         return 0;
94 }
95
96
97 static int macvlan_broadcast_one(struct sk_buff *skb,
98                                  const struct macvlan_dev *vlan,
99                                  const struct ethhdr *eth, bool local)
100 {
101         struct net_device *dev = vlan->dev;
102         if (!skb)
103                 return NET_RX_DROP;
104
105         if (local)
106                 return vlan->forward(dev, skb);
107
108         skb->dev = dev;
109         if (!compare_ether_addr_64bits(eth->h_dest,
110                                        dev->broadcast))
111                 skb->pkt_type = PACKET_BROADCAST;
112         else
113                 skb->pkt_type = PACKET_MULTICAST;
114
115         return vlan->receive(skb);
116 }
117
118 static void macvlan_broadcast(struct sk_buff *skb,
119                               const struct macvlan_port *port,
120                               struct net_device *src,
121                               enum macvlan_mode mode)
122 {
123         const struct ethhdr *eth = eth_hdr(skb);
124         const struct macvlan_dev *vlan;
125         struct hlist_node *n;
126         struct sk_buff *nskb;
127         unsigned int i;
128         int err;
129
130         if (skb->protocol == htons(ETH_P_PAUSE))
131                 return;
132
133         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
134                 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
135                         if (vlan->dev == src || !(vlan->mode & mode))
136                                 continue;
137
138                         nskb = skb_clone(skb, GFP_ATOMIC);
139                         err = macvlan_broadcast_one(nskb, vlan, eth,
140                                          mode == MACVLAN_MODE_BRIDGE);
141                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
142                                          err == NET_RX_SUCCESS, 1);
143                 }
144         }
145 }
146
147 /* called under rcu_read_lock() from netif_receive_skb */
148 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
149 {
150         const struct ethhdr *eth = eth_hdr(skb);
151         const struct macvlan_port *port;
152         const struct macvlan_dev *vlan;
153         const struct macvlan_dev *src;
154         struct net_device *dev;
155         unsigned int len;
156
157         port = rcu_dereference(skb->dev->macvlan_port);
158         if (port == NULL)
159                 return skb;
160
161         if (is_multicast_ether_addr(eth->h_dest)) {
162                 src = macvlan_hash_lookup(port, eth->h_source);
163                 if (!src)
164                         /* frame comes from an external address */
165                         macvlan_broadcast(skb, port, NULL,
166                                           MACVLAN_MODE_PRIVATE |
167                                           MACVLAN_MODE_VEPA    |
168                                           MACVLAN_MODE_BRIDGE);
169                 else if (src->mode == MACVLAN_MODE_VEPA)
170                         /* flood to everyone except source */
171                         macvlan_broadcast(skb, port, src->dev,
172                                           MACVLAN_MODE_VEPA |
173                                           MACVLAN_MODE_BRIDGE);
174                 else if (src->mode == MACVLAN_MODE_BRIDGE)
175                         /*
176                          * flood only to VEPA ports, bridge ports
177                          * already saw the frame on the way out.
178                          */
179                         macvlan_broadcast(skb, port, src->dev,
180                                           MACVLAN_MODE_VEPA);
181                 return skb;
182         }
183
184         vlan = macvlan_hash_lookup(port, eth->h_dest);
185         if (vlan == NULL)
186                 return skb;
187
188         dev = vlan->dev;
189         if (unlikely(!(dev->flags & IFF_UP))) {
190                 kfree_skb(skb);
191                 return NULL;
192         }
193         len = skb->len + ETH_HLEN;
194         skb = skb_share_check(skb, GFP_ATOMIC);
195         macvlan_count_rx(vlan, len, skb != NULL, 0);
196         if (!skb)
197                 return NULL;
198
199         skb->dev = dev;
200         skb->pkt_type = PACKET_HOST;
201
202         vlan->receive(skb);
203         return NULL;
204 }
205
206 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
207 {
208         const struct macvlan_dev *vlan = netdev_priv(dev);
209         const struct macvlan_port *port = vlan->port;
210         const struct macvlan_dev *dest;
211
212         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
213                 const struct ethhdr *eth = (void *)skb->data;
214
215                 /* send to other bridge ports directly */
216                 if (is_multicast_ether_addr(eth->h_dest)) {
217                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
218                         goto xmit_world;
219                 }
220
221                 dest = macvlan_hash_lookup(port, eth->h_dest);
222                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
223                         unsigned int length = skb->len + ETH_HLEN;
224                         int ret = dest->forward(dest->dev, skb);
225                         macvlan_count_rx(dest, length,
226                                          ret == NET_RX_SUCCESS, 0);
227
228                         return NET_XMIT_SUCCESS;
229                 }
230         }
231
232 xmit_world:
233         skb_set_dev(skb, vlan->lowerdev);
234         return dev_queue_xmit(skb);
235 }
236
237 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
238                                struct net_device *dev)
239 {
240         int i = skb_get_queue_mapping(skb);
241         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
242         unsigned int len = skb->len;
243         int ret;
244
245         ret = macvlan_queue_xmit(skb, dev);
246         if (likely(ret == NET_XMIT_SUCCESS)) {
247                 txq->tx_packets++;
248                 txq->tx_bytes += len;
249         } else
250                 txq->tx_dropped++;
251
252         return ret;
253 }
254 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
255
256 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
257                                unsigned short type, const void *daddr,
258                                const void *saddr, unsigned len)
259 {
260         const struct macvlan_dev *vlan = netdev_priv(dev);
261         struct net_device *lowerdev = vlan->lowerdev;
262
263         return dev_hard_header(skb, lowerdev, type, daddr,
264                                saddr ? : dev->dev_addr, len);
265 }
266
267 static const struct header_ops macvlan_hard_header_ops = {
268         .create         = macvlan_hard_header,
269         .rebuild        = eth_rebuild_header,
270         .parse          = eth_header_parse,
271         .cache          = eth_header_cache,
272         .cache_update   = eth_header_cache_update,
273 };
274
275 static int macvlan_open(struct net_device *dev)
276 {
277         struct macvlan_dev *vlan = netdev_priv(dev);
278         struct net_device *lowerdev = vlan->lowerdev;
279         int err;
280
281         err = -EBUSY;
282         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
283                 goto out;
284
285         err = dev_unicast_add(lowerdev, dev->dev_addr);
286         if (err < 0)
287                 goto out;
288         if (dev->flags & IFF_ALLMULTI) {
289                 err = dev_set_allmulti(lowerdev, 1);
290                 if (err < 0)
291                         goto del_unicast;
292         }
293         macvlan_hash_add(vlan);
294         return 0;
295
296 del_unicast:
297         dev_unicast_delete(lowerdev, dev->dev_addr);
298 out:
299         return err;
300 }
301
302 static int macvlan_stop(struct net_device *dev)
303 {
304         struct macvlan_dev *vlan = netdev_priv(dev);
305         struct net_device *lowerdev = vlan->lowerdev;
306
307         dev_mc_unsync(lowerdev, dev);
308         if (dev->flags & IFF_ALLMULTI)
309                 dev_set_allmulti(lowerdev, -1);
310
311         dev_unicast_delete(lowerdev, dev->dev_addr);
312
313         macvlan_hash_del(vlan);
314         return 0;
315 }
316
317 static int macvlan_set_mac_address(struct net_device *dev, void *p)
318 {
319         struct macvlan_dev *vlan = netdev_priv(dev);
320         struct net_device *lowerdev = vlan->lowerdev;
321         struct sockaddr *addr = p;
322         int err;
323
324         if (!is_valid_ether_addr(addr->sa_data))
325                 return -EADDRNOTAVAIL;
326
327         if (!(dev->flags & IFF_UP)) {
328                 /* Just copy in the new address */
329                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
330         } else {
331                 /* Rehash and update the device filters */
332                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
333                         return -EBUSY;
334
335                 err = dev_unicast_add(lowerdev, addr->sa_data);
336                 if (err)
337                         return err;
338
339                 dev_unicast_delete(lowerdev, dev->dev_addr);
340
341                 macvlan_hash_change_addr(vlan, addr->sa_data);
342         }
343         return 0;
344 }
345
346 static void macvlan_change_rx_flags(struct net_device *dev, int change)
347 {
348         struct macvlan_dev *vlan = netdev_priv(dev);
349         struct net_device *lowerdev = vlan->lowerdev;
350
351         if (change & IFF_ALLMULTI)
352                 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
353 }
354
355 static void macvlan_set_multicast_list(struct net_device *dev)
356 {
357         struct macvlan_dev *vlan = netdev_priv(dev);
358
359         dev_mc_sync(vlan->lowerdev, dev);
360 }
361
362 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
363 {
364         struct macvlan_dev *vlan = netdev_priv(dev);
365
366         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
367                 return -EINVAL;
368         dev->mtu = new_mtu;
369         return 0;
370 }
371
372 /*
373  * macvlan network devices have devices nesting below it and are a special
374  * "super class" of normal network devices; split their locks off into a
375  * separate class since they always nest.
376  */
377 static struct lock_class_key macvlan_netdev_xmit_lock_key;
378 static struct lock_class_key macvlan_netdev_addr_lock_key;
379
380 #define MACVLAN_FEATURES \
381         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
382          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
383          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO)
384
385 #define MACVLAN_STATE_MASK \
386         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
387
388 static void macvlan_set_lockdep_class_one(struct net_device *dev,
389                                           struct netdev_queue *txq,
390                                           void *_unused)
391 {
392         lockdep_set_class(&txq->_xmit_lock,
393                           &macvlan_netdev_xmit_lock_key);
394 }
395
396 static void macvlan_set_lockdep_class(struct net_device *dev)
397 {
398         lockdep_set_class(&dev->addr_list_lock,
399                           &macvlan_netdev_addr_lock_key);
400         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
401 }
402
403 static int macvlan_init(struct net_device *dev)
404 {
405         struct macvlan_dev *vlan = netdev_priv(dev);
406         const struct net_device *lowerdev = vlan->lowerdev;
407
408         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
409                                   (lowerdev->state & MACVLAN_STATE_MASK);
410         dev->features           = lowerdev->features & MACVLAN_FEATURES;
411         dev->gso_max_size       = lowerdev->gso_max_size;
412         dev->iflink             = lowerdev->ifindex;
413         dev->hard_header_len    = lowerdev->hard_header_len;
414
415         macvlan_set_lockdep_class(dev);
416
417         vlan->rx_stats = alloc_percpu(struct macvlan_rx_stats);
418         if (!vlan->rx_stats)
419                 return -ENOMEM;
420
421         return 0;
422 }
423
424 static void macvlan_uninit(struct net_device *dev)
425 {
426         struct macvlan_dev *vlan = netdev_priv(dev);
427
428         free_percpu(vlan->rx_stats);
429 }
430
431 static struct net_device_stats *macvlan_dev_get_stats(struct net_device *dev)
432 {
433         struct net_device_stats *stats = &dev->stats;
434         struct macvlan_dev *vlan = netdev_priv(dev);
435
436         dev_txq_stats_fold(dev, stats);
437
438         if (vlan->rx_stats) {
439                 struct macvlan_rx_stats *p, rx = {0};
440                 int i;
441
442                 for_each_possible_cpu(i) {
443                         p = per_cpu_ptr(vlan->rx_stats, i);
444                         rx.rx_packets += p->rx_packets;
445                         rx.rx_bytes   += p->rx_bytes;
446                         rx.rx_errors  += p->rx_errors;
447                         rx.multicast  += p->multicast;
448                 }
449                 stats->rx_packets = rx.rx_packets;
450                 stats->rx_bytes   = rx.rx_bytes;
451                 stats->rx_errors  = rx.rx_errors;
452                 stats->rx_dropped = rx.rx_errors;
453                 stats->multicast  = rx.multicast;
454         }
455         return stats;
456 }
457
458 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
459                                         struct ethtool_drvinfo *drvinfo)
460 {
461         snprintf(drvinfo->driver, 32, "macvlan");
462         snprintf(drvinfo->version, 32, "0.1");
463 }
464
465 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
466 {
467         const struct macvlan_dev *vlan = netdev_priv(dev);
468         return dev_ethtool_get_rx_csum(vlan->lowerdev);
469 }
470
471 static int macvlan_ethtool_get_settings(struct net_device *dev,
472                                         struct ethtool_cmd *cmd)
473 {
474         const struct macvlan_dev *vlan = netdev_priv(dev);
475         return dev_ethtool_get_settings(vlan->lowerdev, cmd);
476 }
477
478 static u32 macvlan_ethtool_get_flags(struct net_device *dev)
479 {
480         const struct macvlan_dev *vlan = netdev_priv(dev);
481         return dev_ethtool_get_flags(vlan->lowerdev);
482 }
483
484 static const struct ethtool_ops macvlan_ethtool_ops = {
485         .get_link               = ethtool_op_get_link,
486         .get_settings           = macvlan_ethtool_get_settings,
487         .get_rx_csum            = macvlan_ethtool_get_rx_csum,
488         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
489         .get_flags              = macvlan_ethtool_get_flags,
490 };
491
492 static const struct net_device_ops macvlan_netdev_ops = {
493         .ndo_init               = macvlan_init,
494         .ndo_uninit             = macvlan_uninit,
495         .ndo_open               = macvlan_open,
496         .ndo_stop               = macvlan_stop,
497         .ndo_start_xmit         = macvlan_start_xmit,
498         .ndo_change_mtu         = macvlan_change_mtu,
499         .ndo_change_rx_flags    = macvlan_change_rx_flags,
500         .ndo_set_mac_address    = macvlan_set_mac_address,
501         .ndo_set_multicast_list = macvlan_set_multicast_list,
502         .ndo_get_stats          = macvlan_dev_get_stats,
503         .ndo_validate_addr      = eth_validate_addr,
504 };
505
506 static void macvlan_setup(struct net_device *dev)
507 {
508         ether_setup(dev);
509
510         dev->priv_flags        &= ~IFF_XMIT_DST_RELEASE;
511         dev->netdev_ops         = &macvlan_netdev_ops;
512         dev->destructor         = free_netdev;
513         dev->header_ops         = &macvlan_hard_header_ops,
514         dev->ethtool_ops        = &macvlan_ethtool_ops;
515         dev->tx_queue_len       = 0;
516 }
517
518 static int macvlan_port_create(struct net_device *dev)
519 {
520         struct macvlan_port *port;
521         unsigned int i;
522
523         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
524                 return -EINVAL;
525
526         port = kzalloc(sizeof(*port), GFP_KERNEL);
527         if (port == NULL)
528                 return -ENOMEM;
529
530         port->dev = dev;
531         INIT_LIST_HEAD(&port->vlans);
532         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
533                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
534         rcu_assign_pointer(dev->macvlan_port, port);
535         return 0;
536 }
537
538 static void macvlan_port_destroy(struct net_device *dev)
539 {
540         struct macvlan_port *port = dev->macvlan_port;
541
542         rcu_assign_pointer(dev->macvlan_port, NULL);
543         synchronize_rcu();
544         kfree(port);
545 }
546
547 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
548 {
549         if (tb[IFLA_ADDRESS]) {
550                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
551                         return -EINVAL;
552                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
553                         return -EADDRNOTAVAIL;
554         }
555
556         if (data && data[IFLA_MACVLAN_MODE]) {
557                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
558                 case MACVLAN_MODE_PRIVATE:
559                 case MACVLAN_MODE_VEPA:
560                 case MACVLAN_MODE_BRIDGE:
561                         break;
562                 default:
563                         return -EINVAL;
564                 }
565         }
566         return 0;
567 }
568
569 static int macvlan_get_tx_queues(struct net *net,
570                                  struct nlattr *tb[],
571                                  unsigned int *num_tx_queues,
572                                  unsigned int *real_num_tx_queues)
573 {
574         struct net_device *real_dev;
575
576         if (!tb[IFLA_LINK])
577                 return -EINVAL;
578
579         real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
580         if (!real_dev)
581                 return -ENODEV;
582
583         *num_tx_queues      = real_dev->num_tx_queues;
584         *real_num_tx_queues = real_dev->real_num_tx_queues;
585         return 0;
586 }
587
588 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
589                            struct nlattr *tb[], struct nlattr *data[],
590                            int (*receive)(struct sk_buff *skb),
591                            int (*forward)(struct net_device *dev,
592                                           struct sk_buff *skb))
593 {
594         struct macvlan_dev *vlan = netdev_priv(dev);
595         struct macvlan_port *port;
596         struct net_device *lowerdev;
597         int err;
598
599         if (!tb[IFLA_LINK])
600                 return -EINVAL;
601
602         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
603         if (lowerdev == NULL)
604                 return -ENODEV;
605
606         /* When creating macvlans on top of other macvlans - use
607          * the real device as the lowerdev.
608          */
609         if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
610                 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
611                 lowerdev = lowervlan->lowerdev;
612         }
613
614         if (!tb[IFLA_MTU])
615                 dev->mtu = lowerdev->mtu;
616         else if (dev->mtu > lowerdev->mtu)
617                 return -EINVAL;
618
619         if (!tb[IFLA_ADDRESS])
620                 random_ether_addr(dev->dev_addr);
621
622         if (lowerdev->macvlan_port == NULL) {
623                 err = macvlan_port_create(lowerdev);
624                 if (err < 0)
625                         return err;
626         }
627         port = lowerdev->macvlan_port;
628
629         vlan->lowerdev = lowerdev;
630         vlan->dev      = dev;
631         vlan->port     = port;
632         vlan->receive  = receive;
633         vlan->forward  = forward;
634
635         vlan->mode     = MACVLAN_MODE_VEPA;
636         if (data && data[IFLA_MACVLAN_MODE])
637                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
638
639         err = register_netdevice(dev);
640         if (err < 0)
641                 return err;
642
643         list_add_tail(&vlan->list, &port->vlans);
644         netif_stacked_transfer_operstate(lowerdev, dev);
645         return 0;
646 }
647 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
648
649 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
650                            struct nlattr *tb[], struct nlattr *data[])
651 {
652         return macvlan_common_newlink(src_net, dev, tb, data,
653                                       netif_rx,
654                                       dev_forward_skb);
655 }
656
657 void macvlan_dellink(struct net_device *dev, struct list_head *head)
658 {
659         struct macvlan_dev *vlan = netdev_priv(dev);
660         struct macvlan_port *port = vlan->port;
661
662         list_del(&vlan->list);
663         unregister_netdevice_queue(dev, head);
664
665         if (list_empty(&port->vlans))
666                 macvlan_port_destroy(port->dev);
667 }
668 EXPORT_SYMBOL_GPL(macvlan_dellink);
669
670 static int macvlan_changelink(struct net_device *dev,
671                 struct nlattr *tb[], struct nlattr *data[])
672 {
673         struct macvlan_dev *vlan = netdev_priv(dev);
674         if (data && data[IFLA_MACVLAN_MODE])
675                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
676         return 0;
677 }
678
679 static size_t macvlan_get_size(const struct net_device *dev)
680 {
681         return nla_total_size(4);
682 }
683
684 static int macvlan_fill_info(struct sk_buff *skb,
685                                 const struct net_device *dev)
686 {
687         struct macvlan_dev *vlan = netdev_priv(dev);
688
689         NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
690         return 0;
691
692 nla_put_failure:
693         return -EMSGSIZE;
694 }
695
696 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
697         [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
698 };
699
700 int macvlan_link_register(struct rtnl_link_ops *ops)
701 {
702         /* common fields */
703         ops->priv_size          = sizeof(struct macvlan_dev);
704         ops->get_tx_queues      = macvlan_get_tx_queues;
705         ops->setup              = macvlan_setup;
706         ops->validate           = macvlan_validate;
707         ops->maxtype            = IFLA_MACVLAN_MAX;
708         ops->policy             = macvlan_policy;
709         ops->changelink         = macvlan_changelink;
710         ops->get_size           = macvlan_get_size;
711         ops->fill_info          = macvlan_fill_info;
712
713         return rtnl_link_register(ops);
714 };
715 EXPORT_SYMBOL_GPL(macvlan_link_register);
716
717 static struct rtnl_link_ops macvlan_link_ops = {
718         .kind           = "macvlan",
719         .newlink        = macvlan_newlink,
720         .dellink        = macvlan_dellink,
721 };
722
723 static int macvlan_device_event(struct notifier_block *unused,
724                                 unsigned long event, void *ptr)
725 {
726         struct net_device *dev = ptr;
727         struct macvlan_dev *vlan, *next;
728         struct macvlan_port *port;
729
730         port = dev->macvlan_port;
731         if (port == NULL)
732                 return NOTIFY_DONE;
733
734         switch (event) {
735         case NETDEV_CHANGE:
736                 list_for_each_entry(vlan, &port->vlans, list)
737                         netif_stacked_transfer_operstate(vlan->lowerdev,
738                                                          vlan->dev);
739                 break;
740         case NETDEV_FEAT_CHANGE:
741                 list_for_each_entry(vlan, &port->vlans, list) {
742                         vlan->dev->features = dev->features & MACVLAN_FEATURES;
743                         vlan->dev->gso_max_size = dev->gso_max_size;
744                         netdev_features_change(vlan->dev);
745                 }
746                 break;
747         case NETDEV_UNREGISTER:
748                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
749                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
750                 break;
751         }
752         return NOTIFY_DONE;
753 }
754
755 static struct notifier_block macvlan_notifier_block __read_mostly = {
756         .notifier_call  = macvlan_device_event,
757 };
758
759 static int __init macvlan_init_module(void)
760 {
761         int err;
762
763         register_netdevice_notifier(&macvlan_notifier_block);
764         macvlan_handle_frame_hook = macvlan_handle_frame;
765
766         err = macvlan_link_register(&macvlan_link_ops);
767         if (err < 0)
768                 goto err1;
769         return 0;
770 err1:
771         macvlan_handle_frame_hook = NULL;
772         unregister_netdevice_notifier(&macvlan_notifier_block);
773         return err;
774 }
775
776 static void __exit macvlan_cleanup_module(void)
777 {
778         rtnl_link_unregister(&macvlan_link_ops);
779         macvlan_handle_frame_hook = NULL;
780         unregister_netdevice_notifier(&macvlan_notifier_block);
781 }
782
783 module_init(macvlan_init_module);
784 module_exit(macvlan_cleanup_module);
785
786 MODULE_LICENSE("GPL");
787 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
788 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
789 MODULE_ALIAS_RTNL_LINK("macvlan");