module_param: make bool parameters really bool (net & drivers/net)
[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_vlan.h>
30 #include <linux/if_link.h>
31 #include <linux/if_macvlan.h>
32 #include <net/rtnetlink.h>
33 #include <net/xfrm.h>
34
35 #define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
36
37 struct macvlan_port {
38         struct net_device       *dev;
39         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
40         struct list_head        vlans;
41         struct rcu_head         rcu;
42         bool                    passthru;
43         int                     count;
44 };
45
46 static void macvlan_port_destroy(struct net_device *dev);
47
48 #define macvlan_port_get_rcu(dev) \
49         ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
50 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
51 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
52
53 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
54                                                const unsigned char *addr)
55 {
56         struct macvlan_dev *vlan;
57         struct hlist_node *n;
58
59         hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
60                 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
61                         return vlan;
62         }
63         return NULL;
64 }
65
66 static void macvlan_hash_add(struct macvlan_dev *vlan)
67 {
68         struct macvlan_port *port = vlan->port;
69         const unsigned char *addr = vlan->dev->dev_addr;
70
71         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
72 }
73
74 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
75 {
76         hlist_del_rcu(&vlan->hlist);
77         if (sync)
78                 synchronize_rcu();
79 }
80
81 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
82                                         const unsigned char *addr)
83 {
84         macvlan_hash_del(vlan, true);
85         /* Now that we are unhashed it is safe to change the device
86          * address without confusing packet delivery.
87          */
88         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
89         macvlan_hash_add(vlan);
90 }
91
92 static int macvlan_addr_busy(const struct macvlan_port *port,
93                                 const unsigned char *addr)
94 {
95         /* Test to see if the specified multicast address is
96          * currently in use by the underlying device or
97          * another macvlan.
98          */
99         if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
100                 return 1;
101
102         if (macvlan_hash_lookup(port, addr))
103                 return 1;
104
105         return 0;
106 }
107
108
109 static int macvlan_broadcast_one(struct sk_buff *skb,
110                                  const struct macvlan_dev *vlan,
111                                  const struct ethhdr *eth, bool local)
112 {
113         struct net_device *dev = vlan->dev;
114         if (!skb)
115                 return NET_RX_DROP;
116
117         if (local)
118                 return vlan->forward(dev, skb);
119
120         skb->dev = dev;
121         if (!compare_ether_addr_64bits(eth->h_dest,
122                                        dev->broadcast))
123                 skb->pkt_type = PACKET_BROADCAST;
124         else
125                 skb->pkt_type = PACKET_MULTICAST;
126
127         return vlan->receive(skb);
128 }
129
130 static void macvlan_broadcast(struct sk_buff *skb,
131                               const struct macvlan_port *port,
132                               struct net_device *src,
133                               enum macvlan_mode mode)
134 {
135         const struct ethhdr *eth = eth_hdr(skb);
136         const struct macvlan_dev *vlan;
137         struct hlist_node *n;
138         struct sk_buff *nskb;
139         unsigned int i;
140         int err;
141
142         if (skb->protocol == htons(ETH_P_PAUSE))
143                 return;
144
145         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
146                 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
147                         if (vlan->dev == src || !(vlan->mode & mode))
148                                 continue;
149
150                         nskb = skb_clone(skb, GFP_ATOMIC);
151                         err = macvlan_broadcast_one(nskb, vlan, eth,
152                                          mode == MACVLAN_MODE_BRIDGE);
153                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
154                                          err == NET_RX_SUCCESS, 1);
155                 }
156         }
157 }
158
159 /* called under rcu_read_lock() from netif_receive_skb */
160 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
161 {
162         struct macvlan_port *port;
163         struct sk_buff *skb = *pskb;
164         const struct ethhdr *eth = eth_hdr(skb);
165         const struct macvlan_dev *vlan;
166         const struct macvlan_dev *src;
167         struct net_device *dev;
168         unsigned int len = 0;
169         int ret = NET_RX_DROP;
170
171         port = macvlan_port_get_rcu(skb->dev);
172         if (is_multicast_ether_addr(eth->h_dest)) {
173                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
174                 if (!skb)
175                         return RX_HANDLER_CONSUMED;
176                 src = macvlan_hash_lookup(port, eth->h_source);
177                 if (!src)
178                         /* frame comes from an external address */
179                         macvlan_broadcast(skb, port, NULL,
180                                           MACVLAN_MODE_PRIVATE |
181                                           MACVLAN_MODE_VEPA    |
182                                           MACVLAN_MODE_PASSTHRU|
183                                           MACVLAN_MODE_BRIDGE);
184                 else if (src->mode == MACVLAN_MODE_VEPA)
185                         /* flood to everyone except source */
186                         macvlan_broadcast(skb, port, src->dev,
187                                           MACVLAN_MODE_VEPA |
188                                           MACVLAN_MODE_BRIDGE);
189                 else if (src->mode == MACVLAN_MODE_BRIDGE)
190                         /*
191                          * flood only to VEPA ports, bridge ports
192                          * already saw the frame on the way out.
193                          */
194                         macvlan_broadcast(skb, port, src->dev,
195                                           MACVLAN_MODE_VEPA);
196                 else {
197                         /* forward to original port. */
198                         vlan = src;
199                         ret = macvlan_broadcast_one(skb, vlan, eth, 0);
200                         goto out;
201                 }
202
203                 return RX_HANDLER_PASS;
204         }
205
206         if (port->passthru)
207                 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
208         else
209                 vlan = macvlan_hash_lookup(port, eth->h_dest);
210         if (vlan == NULL)
211                 return RX_HANDLER_PASS;
212
213         dev = vlan->dev;
214         if (unlikely(!(dev->flags & IFF_UP))) {
215                 kfree_skb(skb);
216                 return RX_HANDLER_CONSUMED;
217         }
218         len = skb->len + ETH_HLEN;
219         skb = skb_share_check(skb, GFP_ATOMIC);
220         if (!skb)
221                 goto out;
222
223         skb->dev = dev;
224         skb->pkt_type = PACKET_HOST;
225
226         ret = vlan->receive(skb);
227
228 out:
229         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
230         return RX_HANDLER_CONSUMED;
231 }
232
233 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
234 {
235         const struct macvlan_dev *vlan = netdev_priv(dev);
236         const struct macvlan_port *port = vlan->port;
237         const struct macvlan_dev *dest;
238         __u8 ip_summed = skb->ip_summed;
239
240         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
241                 const struct ethhdr *eth = (void *)skb->data;
242                 skb->ip_summed = CHECKSUM_UNNECESSARY;
243
244                 /* send to other bridge ports directly */
245                 if (is_multicast_ether_addr(eth->h_dest)) {
246                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
247                         goto xmit_world;
248                 }
249
250                 dest = macvlan_hash_lookup(port, eth->h_dest);
251                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
252                         /* send to lowerdev first for its network taps */
253                         dev_forward_skb(vlan->lowerdev, skb);
254
255                         return NET_XMIT_SUCCESS;
256                 }
257         }
258
259 xmit_world:
260         skb->ip_summed = ip_summed;
261         skb_set_dev(skb, vlan->lowerdev);
262         return dev_queue_xmit(skb);
263 }
264
265 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
266                                struct net_device *dev)
267 {
268         unsigned int len = skb->len;
269         int ret;
270         const struct macvlan_dev *vlan = netdev_priv(dev);
271
272         ret = macvlan_queue_xmit(skb, dev);
273         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
274                 struct macvlan_pcpu_stats *pcpu_stats;
275
276                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
277                 u64_stats_update_begin(&pcpu_stats->syncp);
278                 pcpu_stats->tx_packets++;
279                 pcpu_stats->tx_bytes += len;
280                 u64_stats_update_end(&pcpu_stats->syncp);
281         } else {
282                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
283         }
284         return ret;
285 }
286 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
287
288 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
289                                unsigned short type, const void *daddr,
290                                const void *saddr, unsigned len)
291 {
292         const struct macvlan_dev *vlan = netdev_priv(dev);
293         struct net_device *lowerdev = vlan->lowerdev;
294
295         return dev_hard_header(skb, lowerdev, type, daddr,
296                                saddr ? : dev->dev_addr, len);
297 }
298
299 static const struct header_ops macvlan_hard_header_ops = {
300         .create         = macvlan_hard_header,
301         .rebuild        = eth_rebuild_header,
302         .parse          = eth_header_parse,
303         .cache          = eth_header_cache,
304         .cache_update   = eth_header_cache_update,
305 };
306
307 static int macvlan_open(struct net_device *dev)
308 {
309         struct macvlan_dev *vlan = netdev_priv(dev);
310         struct net_device *lowerdev = vlan->lowerdev;
311         int err;
312
313         if (vlan->port->passthru) {
314                 dev_set_promiscuity(lowerdev, 1);
315                 goto hash_add;
316         }
317
318         err = -EBUSY;
319         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
320                 goto out;
321
322         err = dev_uc_add(lowerdev, dev->dev_addr);
323         if (err < 0)
324                 goto out;
325         if (dev->flags & IFF_ALLMULTI) {
326                 err = dev_set_allmulti(lowerdev, 1);
327                 if (err < 0)
328                         goto del_unicast;
329         }
330
331 hash_add:
332         macvlan_hash_add(vlan);
333         return 0;
334
335 del_unicast:
336         dev_uc_del(lowerdev, dev->dev_addr);
337 out:
338         return err;
339 }
340
341 static int macvlan_stop(struct net_device *dev)
342 {
343         struct macvlan_dev *vlan = netdev_priv(dev);
344         struct net_device *lowerdev = vlan->lowerdev;
345
346         if (vlan->port->passthru) {
347                 dev_set_promiscuity(lowerdev, -1);
348                 goto hash_del;
349         }
350
351         dev_mc_unsync(lowerdev, dev);
352         if (dev->flags & IFF_ALLMULTI)
353                 dev_set_allmulti(lowerdev, -1);
354
355         dev_uc_del(lowerdev, dev->dev_addr);
356
357 hash_del:
358         macvlan_hash_del(vlan, !dev->dismantle);
359         return 0;
360 }
361
362 static int macvlan_set_mac_address(struct net_device *dev, void *p)
363 {
364         struct macvlan_dev *vlan = netdev_priv(dev);
365         struct net_device *lowerdev = vlan->lowerdev;
366         struct sockaddr *addr = p;
367         int err;
368
369         if (!is_valid_ether_addr(addr->sa_data))
370                 return -EADDRNOTAVAIL;
371
372         if (!(dev->flags & IFF_UP)) {
373                 /* Just copy in the new address */
374                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
375         } else {
376                 /* Rehash and update the device filters */
377                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
378                         return -EBUSY;
379
380                 err = dev_uc_add(lowerdev, addr->sa_data);
381                 if (err)
382                         return err;
383
384                 dev_uc_del(lowerdev, dev->dev_addr);
385
386                 macvlan_hash_change_addr(vlan, addr->sa_data);
387         }
388         return 0;
389 }
390
391 static void macvlan_change_rx_flags(struct net_device *dev, int change)
392 {
393         struct macvlan_dev *vlan = netdev_priv(dev);
394         struct net_device *lowerdev = vlan->lowerdev;
395
396         if (change & IFF_ALLMULTI)
397                 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
398 }
399
400 static void macvlan_set_multicast_list(struct net_device *dev)
401 {
402         struct macvlan_dev *vlan = netdev_priv(dev);
403
404         dev_mc_sync(vlan->lowerdev, dev);
405 }
406
407 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
408 {
409         struct macvlan_dev *vlan = netdev_priv(dev);
410
411         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
412                 return -EINVAL;
413         dev->mtu = new_mtu;
414         return 0;
415 }
416
417 /*
418  * macvlan network devices have devices nesting below it and are a special
419  * "super class" of normal network devices; split their locks off into a
420  * separate class since they always nest.
421  */
422 static struct lock_class_key macvlan_netdev_xmit_lock_key;
423 static struct lock_class_key macvlan_netdev_addr_lock_key;
424
425 #define MACVLAN_FEATURES \
426         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
427          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
428          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
429          NETIF_F_HW_VLAN_FILTER)
430
431 #define MACVLAN_STATE_MASK \
432         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
433
434 static void macvlan_set_lockdep_class_one(struct net_device *dev,
435                                           struct netdev_queue *txq,
436                                           void *_unused)
437 {
438         lockdep_set_class(&txq->_xmit_lock,
439                           &macvlan_netdev_xmit_lock_key);
440 }
441
442 static void macvlan_set_lockdep_class(struct net_device *dev)
443 {
444         lockdep_set_class(&dev->addr_list_lock,
445                           &macvlan_netdev_addr_lock_key);
446         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
447 }
448
449 static int macvlan_init(struct net_device *dev)
450 {
451         struct macvlan_dev *vlan = netdev_priv(dev);
452         const struct net_device *lowerdev = vlan->lowerdev;
453
454         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
455                                   (lowerdev->state & MACVLAN_STATE_MASK);
456         dev->features           = lowerdev->features & MACVLAN_FEATURES;
457         dev->features           |= NETIF_F_LLTX;
458         dev->gso_max_size       = lowerdev->gso_max_size;
459         dev->iflink             = lowerdev->ifindex;
460         dev->hard_header_len    = lowerdev->hard_header_len;
461
462         macvlan_set_lockdep_class(dev);
463
464         vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
465         if (!vlan->pcpu_stats)
466                 return -ENOMEM;
467
468         return 0;
469 }
470
471 static void macvlan_uninit(struct net_device *dev)
472 {
473         struct macvlan_dev *vlan = netdev_priv(dev);
474         struct macvlan_port *port = vlan->port;
475
476         free_percpu(vlan->pcpu_stats);
477
478         port->count -= 1;
479         if (!port->count)
480                 macvlan_port_destroy(port->dev);
481 }
482
483 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
484                                                          struct rtnl_link_stats64 *stats)
485 {
486         struct macvlan_dev *vlan = netdev_priv(dev);
487
488         if (vlan->pcpu_stats) {
489                 struct macvlan_pcpu_stats *p;
490                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
491                 u32 rx_errors = 0, tx_dropped = 0;
492                 unsigned int start;
493                 int i;
494
495                 for_each_possible_cpu(i) {
496                         p = per_cpu_ptr(vlan->pcpu_stats, i);
497                         do {
498                                 start = u64_stats_fetch_begin_bh(&p->syncp);
499                                 rx_packets      = p->rx_packets;
500                                 rx_bytes        = p->rx_bytes;
501                                 rx_multicast    = p->rx_multicast;
502                                 tx_packets      = p->tx_packets;
503                                 tx_bytes        = p->tx_bytes;
504                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
505
506                         stats->rx_packets       += rx_packets;
507                         stats->rx_bytes         += rx_bytes;
508                         stats->multicast        += rx_multicast;
509                         stats->tx_packets       += tx_packets;
510                         stats->tx_bytes         += tx_bytes;
511                         /* rx_errors & tx_dropped are u32, updated
512                          * without syncp protection.
513                          */
514                         rx_errors       += p->rx_errors;
515                         tx_dropped      += p->tx_dropped;
516                 }
517                 stats->rx_errors        = rx_errors;
518                 stats->rx_dropped       = rx_errors;
519                 stats->tx_dropped       = tx_dropped;
520         }
521         return stats;
522 }
523
524 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
525                                     unsigned short vid)
526 {
527         struct macvlan_dev *vlan = netdev_priv(dev);
528         struct net_device *lowerdev = vlan->lowerdev;
529
530         return vlan_vid_add(lowerdev, vid);
531 }
532
533 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
534                                      unsigned short vid)
535 {
536         struct macvlan_dev *vlan = netdev_priv(dev);
537         struct net_device *lowerdev = vlan->lowerdev;
538
539         vlan_vid_del(lowerdev, vid);
540         return 0;
541 }
542
543 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
544                                         struct ethtool_drvinfo *drvinfo)
545 {
546         snprintf(drvinfo->driver, 32, "macvlan");
547         snprintf(drvinfo->version, 32, "0.1");
548 }
549
550 static int macvlan_ethtool_get_settings(struct net_device *dev,
551                                         struct ethtool_cmd *cmd)
552 {
553         const struct macvlan_dev *vlan = netdev_priv(dev);
554
555         return __ethtool_get_settings(vlan->lowerdev, cmd);
556 }
557
558 static const struct ethtool_ops macvlan_ethtool_ops = {
559         .get_link               = ethtool_op_get_link,
560         .get_settings           = macvlan_ethtool_get_settings,
561         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
562 };
563
564 static const struct net_device_ops macvlan_netdev_ops = {
565         .ndo_init               = macvlan_init,
566         .ndo_uninit             = macvlan_uninit,
567         .ndo_open               = macvlan_open,
568         .ndo_stop               = macvlan_stop,
569         .ndo_start_xmit         = macvlan_start_xmit,
570         .ndo_change_mtu         = macvlan_change_mtu,
571         .ndo_change_rx_flags    = macvlan_change_rx_flags,
572         .ndo_set_mac_address    = macvlan_set_mac_address,
573         .ndo_set_rx_mode        = macvlan_set_multicast_list,
574         .ndo_get_stats64        = macvlan_dev_get_stats64,
575         .ndo_validate_addr      = eth_validate_addr,
576         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
577         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
578 };
579
580 void macvlan_common_setup(struct net_device *dev)
581 {
582         ether_setup(dev);
583
584         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
585         dev->netdev_ops         = &macvlan_netdev_ops;
586         dev->destructor         = free_netdev;
587         dev->header_ops         = &macvlan_hard_header_ops,
588         dev->ethtool_ops        = &macvlan_ethtool_ops;
589 }
590 EXPORT_SYMBOL_GPL(macvlan_common_setup);
591
592 static void macvlan_setup(struct net_device *dev)
593 {
594         macvlan_common_setup(dev);
595         dev->tx_queue_len       = 0;
596 }
597
598 static int macvlan_port_create(struct net_device *dev)
599 {
600         struct macvlan_port *port;
601         unsigned int i;
602         int err;
603
604         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
605                 return -EINVAL;
606
607         port = kzalloc(sizeof(*port), GFP_KERNEL);
608         if (port == NULL)
609                 return -ENOMEM;
610
611         port->passthru = false;
612         port->dev = dev;
613         INIT_LIST_HEAD(&port->vlans);
614         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
615                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
616
617         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
618         if (err)
619                 kfree(port);
620         else
621                 dev->priv_flags |= IFF_MACVLAN_PORT;
622         return err;
623 }
624
625 static void macvlan_port_destroy(struct net_device *dev)
626 {
627         struct macvlan_port *port = macvlan_port_get(dev);
628
629         dev->priv_flags &= ~IFF_MACVLAN_PORT;
630         netdev_rx_handler_unregister(dev);
631         kfree_rcu(port, rcu);
632 }
633
634 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
635 {
636         if (tb[IFLA_ADDRESS]) {
637                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
638                         return -EINVAL;
639                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
640                         return -EADDRNOTAVAIL;
641         }
642
643         if (data && data[IFLA_MACVLAN_MODE]) {
644                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
645                 case MACVLAN_MODE_PRIVATE:
646                 case MACVLAN_MODE_VEPA:
647                 case MACVLAN_MODE_BRIDGE:
648                 case MACVLAN_MODE_PASSTHRU:
649                         break;
650                 default:
651                         return -EINVAL;
652                 }
653         }
654         return 0;
655 }
656
657 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
658                            struct nlattr *tb[], struct nlattr *data[],
659                            int (*receive)(struct sk_buff *skb),
660                            int (*forward)(struct net_device *dev,
661                                           struct sk_buff *skb))
662 {
663         struct macvlan_dev *vlan = netdev_priv(dev);
664         struct macvlan_port *port;
665         struct net_device *lowerdev;
666         int err;
667
668         if (!tb[IFLA_LINK])
669                 return -EINVAL;
670
671         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
672         if (lowerdev == NULL)
673                 return -ENODEV;
674
675         /* When creating macvlans on top of other macvlans - use
676          * the real device as the lowerdev.
677          */
678         if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
679                 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
680                 lowerdev = lowervlan->lowerdev;
681         }
682
683         if (!tb[IFLA_MTU])
684                 dev->mtu = lowerdev->mtu;
685         else if (dev->mtu > lowerdev->mtu)
686                 return -EINVAL;
687
688         if (!tb[IFLA_ADDRESS])
689                 random_ether_addr(dev->dev_addr);
690
691         if (!macvlan_port_exists(lowerdev)) {
692                 err = macvlan_port_create(lowerdev);
693                 if (err < 0)
694                         return err;
695         }
696         port = macvlan_port_get(lowerdev);
697
698         /* Only 1 macvlan device can be created in passthru mode */
699         if (port->passthru)
700                 return -EINVAL;
701
702         vlan->lowerdev = lowerdev;
703         vlan->dev      = dev;
704         vlan->port     = port;
705         vlan->receive  = receive;
706         vlan->forward  = forward;
707
708         vlan->mode     = MACVLAN_MODE_VEPA;
709         if (data && data[IFLA_MACVLAN_MODE])
710                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
711
712         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
713                 if (port->count)
714                         return -EINVAL;
715                 port->passthru = true;
716                 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
717         }
718
719         port->count += 1;
720         err = register_netdevice(dev);
721         if (err < 0)
722                 goto destroy_port;
723
724         list_add_tail(&vlan->list, &port->vlans);
725         netif_stacked_transfer_operstate(lowerdev, dev);
726
727         return 0;
728
729 destroy_port:
730         port->count -= 1;
731         if (!port->count)
732                 macvlan_port_destroy(lowerdev);
733
734         return err;
735 }
736 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
737
738 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
739                            struct nlattr *tb[], struct nlattr *data[])
740 {
741         return macvlan_common_newlink(src_net, dev, tb, data,
742                                       netif_rx,
743                                       dev_forward_skb);
744 }
745
746 void macvlan_dellink(struct net_device *dev, struct list_head *head)
747 {
748         struct macvlan_dev *vlan = netdev_priv(dev);
749
750         list_del(&vlan->list);
751         unregister_netdevice_queue(dev, head);
752 }
753 EXPORT_SYMBOL_GPL(macvlan_dellink);
754
755 static int macvlan_changelink(struct net_device *dev,
756                 struct nlattr *tb[], struct nlattr *data[])
757 {
758         struct macvlan_dev *vlan = netdev_priv(dev);
759         if (data && data[IFLA_MACVLAN_MODE])
760                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
761         return 0;
762 }
763
764 static size_t macvlan_get_size(const struct net_device *dev)
765 {
766         return nla_total_size(4);
767 }
768
769 static int macvlan_fill_info(struct sk_buff *skb,
770                                 const struct net_device *dev)
771 {
772         struct macvlan_dev *vlan = netdev_priv(dev);
773
774         NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
775         return 0;
776
777 nla_put_failure:
778         return -EMSGSIZE;
779 }
780
781 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
782         [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
783 };
784
785 int macvlan_link_register(struct rtnl_link_ops *ops)
786 {
787         /* common fields */
788         ops->priv_size          = sizeof(struct macvlan_dev);
789         ops->validate           = macvlan_validate;
790         ops->maxtype            = IFLA_MACVLAN_MAX;
791         ops->policy             = macvlan_policy;
792         ops->changelink         = macvlan_changelink;
793         ops->get_size           = macvlan_get_size;
794         ops->fill_info          = macvlan_fill_info;
795
796         return rtnl_link_register(ops);
797 };
798 EXPORT_SYMBOL_GPL(macvlan_link_register);
799
800 static struct rtnl_link_ops macvlan_link_ops = {
801         .kind           = "macvlan",
802         .setup          = macvlan_setup,
803         .newlink        = macvlan_newlink,
804         .dellink        = macvlan_dellink,
805 };
806
807 static int macvlan_device_event(struct notifier_block *unused,
808                                 unsigned long event, void *ptr)
809 {
810         struct net_device *dev = ptr;
811         struct macvlan_dev *vlan, *next;
812         struct macvlan_port *port;
813         LIST_HEAD(list_kill);
814
815         if (!macvlan_port_exists(dev))
816                 return NOTIFY_DONE;
817
818         port = macvlan_port_get(dev);
819
820         switch (event) {
821         case NETDEV_CHANGE:
822                 list_for_each_entry(vlan, &port->vlans, list)
823                         netif_stacked_transfer_operstate(vlan->lowerdev,
824                                                          vlan->dev);
825                 break;
826         case NETDEV_FEAT_CHANGE:
827                 list_for_each_entry(vlan, &port->vlans, list) {
828                         vlan->dev->features = dev->features & MACVLAN_FEATURES;
829                         vlan->dev->gso_max_size = dev->gso_max_size;
830                         netdev_features_change(vlan->dev);
831                 }
832                 break;
833         case NETDEV_UNREGISTER:
834                 /* twiddle thumbs on netns device moves */
835                 if (dev->reg_state != NETREG_UNREGISTERING)
836                         break;
837
838                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
839                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
840                 unregister_netdevice_many(&list_kill);
841                 list_del(&list_kill);
842                 break;
843         case NETDEV_PRE_TYPE_CHANGE:
844                 /* Forbid underlaying device to change its type. */
845                 return NOTIFY_BAD;
846         }
847         return NOTIFY_DONE;
848 }
849
850 static struct notifier_block macvlan_notifier_block __read_mostly = {
851         .notifier_call  = macvlan_device_event,
852 };
853
854 static int __init macvlan_init_module(void)
855 {
856         int err;
857
858         register_netdevice_notifier(&macvlan_notifier_block);
859
860         err = macvlan_link_register(&macvlan_link_ops);
861         if (err < 0)
862                 goto err1;
863         return 0;
864 err1:
865         unregister_netdevice_notifier(&macvlan_notifier_block);
866         return err;
867 }
868
869 static void __exit macvlan_cleanup_module(void)
870 {
871         rtnl_link_unregister(&macvlan_link_ops);
872         unregister_netdevice_notifier(&macvlan_notifier_block);
873 }
874
875 module_init(macvlan_init_module);
876 module_exit(macvlan_cleanup_module);
877
878 MODULE_LICENSE("GPL");
879 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
880 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
881 MODULE_ALIAS_RTNL_LINK("macvlan");