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macvlan.c
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1 /*
2  * Copyright (c) 2007 Patrick McHardy <[email protected]>
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, [email protected]
13  * Re-worked by Ben Greear <[email protected]>
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 (ether_addr_equal_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 (ether_addr_equal_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 (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
122  skb->pkt_type = PACKET_BROADCAST;
123  else
124  skb->pkt_type = PACKET_MULTICAST;
125 
126  return vlan->receive(skb);
127 }
128 
129 static void macvlan_broadcast(struct sk_buff *skb,
130  const struct macvlan_port *port,
131  struct net_device *src,
132  enum macvlan_mode mode)
133 {
134  const struct ethhdr *eth = eth_hdr(skb);
135  const struct macvlan_dev *vlan;
136  struct hlist_node *n;
137  struct sk_buff *nskb;
138  unsigned int i;
139  int err;
140 
141  if (skb->protocol == htons(ETH_P_PAUSE))
142  return;
143 
144  for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
145  hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
146  if (vlan->dev == src || !(vlan->mode & mode))
147  continue;
148 
149  nskb = skb_clone(skb, GFP_ATOMIC);
150  err = macvlan_broadcast_one(nskb, vlan, eth,
151  mode == MACVLAN_MODE_BRIDGE);
152  macvlan_count_rx(vlan, skb->len + ETH_HLEN,
153  err == NET_RX_SUCCESS, 1);
154  }
155  }
156 }
157 
158 /* called under rcu_read_lock() from netif_receive_skb */
159 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
160 {
161  struct macvlan_port *port;
162  struct sk_buff *skb = *pskb;
163  const struct ethhdr *eth = eth_hdr(skb);
164  const struct macvlan_dev *vlan;
165  const struct macvlan_dev *src;
166  struct net_device *dev;
167  unsigned int len = 0;
168  int ret = NET_RX_DROP;
169 
170  port = macvlan_port_get_rcu(skb->dev);
171  if (is_multicast_ether_addr(eth->h_dest)) {
172  skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
173  if (!skb)
174  return RX_HANDLER_CONSUMED;
175  eth = eth_hdr(skb);
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->dev = 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  if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
315  dev_set_promiscuity(lowerdev, 1);
316  goto hash_add;
317  }
318 
319  err = -EBUSY;
320  if (macvlan_addr_busy(vlan->port, dev->dev_addr))
321  goto out;
322 
323  err = dev_uc_add(lowerdev, dev->dev_addr);
324  if (err < 0)
325  goto out;
326  if (dev->flags & IFF_ALLMULTI) {
327  err = dev_set_allmulti(lowerdev, 1);
328  if (err < 0)
329  goto del_unicast;
330  }
331 
332 hash_add:
333  macvlan_hash_add(vlan);
334  return 0;
335 
336 del_unicast:
337  dev_uc_del(lowerdev, dev->dev_addr);
338 out:
339  return err;
340 }
341 
342 static int macvlan_stop(struct net_device *dev)
343 {
344  struct macvlan_dev *vlan = netdev_priv(dev);
345  struct net_device *lowerdev = vlan->lowerdev;
346 
347  dev_uc_unsync(lowerdev, dev);
348  dev_mc_unsync(lowerdev, dev);
349 
350  if (vlan->port->passthru) {
351  if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
352  dev_set_promiscuity(lowerdev, -1);
353  goto hash_del;
354  }
355 
356  if (dev->flags & IFF_ALLMULTI)
357  dev_set_allmulti(lowerdev, -1);
358 
359  dev_uc_del(lowerdev, dev->dev_addr);
360 
361 hash_del:
362  macvlan_hash_del(vlan, !dev->dismantle);
363  return 0;
364 }
365 
366 static int macvlan_set_mac_address(struct net_device *dev, void *p)
367 {
368  struct macvlan_dev *vlan = netdev_priv(dev);
369  struct net_device *lowerdev = vlan->lowerdev;
370  struct sockaddr *addr = p;
371  int err;
372 
373  if (!is_valid_ether_addr(addr->sa_data))
374  return -EADDRNOTAVAIL;
375 
376  if (!(dev->flags & IFF_UP)) {
377  /* Just copy in the new address */
378  dev->addr_assign_type &= ~NET_ADDR_RANDOM;
379  memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
380  } else {
381  /* Rehash and update the device filters */
382  if (macvlan_addr_busy(vlan->port, addr->sa_data))
383  return -EBUSY;
384 
385  err = dev_uc_add(lowerdev, addr->sa_data);
386  if (err)
387  return err;
388 
389  dev_uc_del(lowerdev, dev->dev_addr);
390 
391  macvlan_hash_change_addr(vlan, addr->sa_data);
392  }
393  return 0;
394 }
395 
396 static void macvlan_change_rx_flags(struct net_device *dev, int change)
397 {
398  struct macvlan_dev *vlan = netdev_priv(dev);
399  struct net_device *lowerdev = vlan->lowerdev;
400 
401  if (change & IFF_ALLMULTI)
402  dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
403 }
404 
405 static void macvlan_set_mac_lists(struct net_device *dev)
406 {
407  struct macvlan_dev *vlan = netdev_priv(dev);
408 
409  dev_uc_sync(vlan->lowerdev, dev);
410  dev_mc_sync(vlan->lowerdev, dev);
411 }
412 
413 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
414 {
415  struct macvlan_dev *vlan = netdev_priv(dev);
416 
417  if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
418  return -EINVAL;
419  dev->mtu = new_mtu;
420  return 0;
421 }
422 
423 /*
424  * macvlan network devices have devices nesting below it and are a special
425  * "super class" of normal network devices; split their locks off into a
426  * separate class since they always nest.
427  */
428 static struct lock_class_key macvlan_netdev_xmit_lock_key;
429 static struct lock_class_key macvlan_netdev_addr_lock_key;
430 
431 #define MACVLAN_FEATURES \
432  (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
433  NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
434  NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
435  NETIF_F_HW_VLAN_FILTER)
436 
437 #define MACVLAN_STATE_MASK \
438  ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
439 
440 static void macvlan_set_lockdep_class_one(struct net_device *dev,
441  struct netdev_queue *txq,
442  void *_unused)
443 {
444  lockdep_set_class(&txq->_xmit_lock,
445  &macvlan_netdev_xmit_lock_key);
446 }
447 
448 static void macvlan_set_lockdep_class(struct net_device *dev)
449 {
450  lockdep_set_class(&dev->addr_list_lock,
451  &macvlan_netdev_addr_lock_key);
452  netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
453 }
454 
455 static int macvlan_init(struct net_device *dev)
456 {
457  struct macvlan_dev *vlan = netdev_priv(dev);
458  const struct net_device *lowerdev = vlan->lowerdev;
459 
460  dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
461  (lowerdev->state & MACVLAN_STATE_MASK);
462  dev->features = lowerdev->features & MACVLAN_FEATURES;
463  dev->features |= NETIF_F_LLTX;
464  dev->gso_max_size = lowerdev->gso_max_size;
465  dev->iflink = lowerdev->ifindex;
466  dev->hard_header_len = lowerdev->hard_header_len;
467 
468  macvlan_set_lockdep_class(dev);
469 
470  vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
471  if (!vlan->pcpu_stats)
472  return -ENOMEM;
473 
474  return 0;
475 }
476 
477 static void macvlan_uninit(struct net_device *dev)
478 {
479  struct macvlan_dev *vlan = netdev_priv(dev);
480  struct macvlan_port *port = vlan->port;
481 
482  free_percpu(vlan->pcpu_stats);
483 
484  port->count -= 1;
485  if (!port->count)
486  macvlan_port_destroy(port->dev);
487 }
488 
489 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
490  struct rtnl_link_stats64 *stats)
491 {
492  struct macvlan_dev *vlan = netdev_priv(dev);
493 
494  if (vlan->pcpu_stats) {
495  struct macvlan_pcpu_stats *p;
496  u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
497  u32 rx_errors = 0, tx_dropped = 0;
498  unsigned int start;
499  int i;
500 
501  for_each_possible_cpu(i) {
502  p = per_cpu_ptr(vlan->pcpu_stats, i);
503  do {
504  start = u64_stats_fetch_begin_bh(&p->syncp);
505  rx_packets = p->rx_packets;
506  rx_bytes = p->rx_bytes;
507  rx_multicast = p->rx_multicast;
508  tx_packets = p->tx_packets;
509  tx_bytes = p->tx_bytes;
510  } while (u64_stats_fetch_retry_bh(&p->syncp, start));
511 
512  stats->rx_packets += rx_packets;
513  stats->rx_bytes += rx_bytes;
514  stats->multicast += rx_multicast;
515  stats->tx_packets += tx_packets;
516  stats->tx_bytes += tx_bytes;
517  /* rx_errors & tx_dropped are u32, updated
518  * without syncp protection.
519  */
520  rx_errors += p->rx_errors;
521  tx_dropped += p->tx_dropped;
522  }
523  stats->rx_errors = rx_errors;
524  stats->rx_dropped = rx_errors;
525  stats->tx_dropped = tx_dropped;
526  }
527  return stats;
528 }
529 
530 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
531  unsigned short vid)
532 {
533  struct macvlan_dev *vlan = netdev_priv(dev);
534  struct net_device *lowerdev = vlan->lowerdev;
535 
536  return vlan_vid_add(lowerdev, vid);
537 }
538 
539 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
540  unsigned short vid)
541 {
542  struct macvlan_dev *vlan = netdev_priv(dev);
543  struct net_device *lowerdev = vlan->lowerdev;
544 
545  vlan_vid_del(lowerdev, vid);
546  return 0;
547 }
548 
549 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
550  struct net_device *dev,
551  const unsigned char *addr,
552  u16 flags)
553 {
554  struct macvlan_dev *vlan = netdev_priv(dev);
555  int err = -EINVAL;
556 
557  if (!vlan->port->passthru)
558  return -EOPNOTSUPP;
559 
560  if (is_unicast_ether_addr(addr))
561  err = dev_uc_add_excl(dev, addr);
562  else if (is_multicast_ether_addr(addr))
563  err = dev_mc_add_excl(dev, addr);
564 
565  return err;
566 }
567 
568 static int macvlan_fdb_del(struct ndmsg *ndm,
569  struct net_device *dev,
570  const unsigned char *addr)
571 {
572  struct macvlan_dev *vlan = netdev_priv(dev);
573  int err = -EINVAL;
574 
575  if (!vlan->port->passthru)
576  return -EOPNOTSUPP;
577 
578  if (is_unicast_ether_addr(addr))
579  err = dev_uc_del(dev, addr);
580  else if (is_multicast_ether_addr(addr))
581  err = dev_mc_del(dev, addr);
582 
583  return err;
584 }
585 
586 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
587  struct ethtool_drvinfo *drvinfo)
588 {
589  snprintf(drvinfo->driver, 32, "macvlan");
590  snprintf(drvinfo->version, 32, "0.1");
591 }
592 
593 static int macvlan_ethtool_get_settings(struct net_device *dev,
594  struct ethtool_cmd *cmd)
595 {
596  const struct macvlan_dev *vlan = netdev_priv(dev);
597 
598  return __ethtool_get_settings(vlan->lowerdev, cmd);
599 }
600 
601 static const struct ethtool_ops macvlan_ethtool_ops = {
602  .get_link = ethtool_op_get_link,
603  .get_settings = macvlan_ethtool_get_settings,
604  .get_drvinfo = macvlan_ethtool_get_drvinfo,
605 };
606 
607 static const struct net_device_ops macvlan_netdev_ops = {
608  .ndo_init = macvlan_init,
609  .ndo_uninit = macvlan_uninit,
610  .ndo_open = macvlan_open,
611  .ndo_stop = macvlan_stop,
612  .ndo_start_xmit = macvlan_start_xmit,
613  .ndo_change_mtu = macvlan_change_mtu,
614  .ndo_change_rx_flags = macvlan_change_rx_flags,
615  .ndo_set_mac_address = macvlan_set_mac_address,
616  .ndo_set_rx_mode = macvlan_set_mac_lists,
617  .ndo_get_stats64 = macvlan_dev_get_stats64,
618  .ndo_validate_addr = eth_validate_addr,
619  .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
620  .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
621  .ndo_fdb_add = macvlan_fdb_add,
622  .ndo_fdb_del = macvlan_fdb_del,
623  .ndo_fdb_dump = ndo_dflt_fdb_dump,
624 };
625 
626 void macvlan_common_setup(struct net_device *dev)
627 {
628  ether_setup(dev);
629 
630  dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
631  dev->netdev_ops = &macvlan_netdev_ops;
632  dev->destructor = free_netdev;
633  dev->header_ops = &macvlan_hard_header_ops,
634  dev->ethtool_ops = &macvlan_ethtool_ops;
635 }
636 EXPORT_SYMBOL_GPL(macvlan_common_setup);
637 
638 static void macvlan_setup(struct net_device *dev)
639 {
640  macvlan_common_setup(dev);
641  dev->tx_queue_len = 0;
642 }
643 
644 static int macvlan_port_create(struct net_device *dev)
645 {
646  struct macvlan_port *port;
647  unsigned int i;
648  int err;
649 
650  if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
651  return -EINVAL;
652 
653  port = kzalloc(sizeof(*port), GFP_KERNEL);
654  if (port == NULL)
655  return -ENOMEM;
656 
657  port->passthru = false;
658  port->dev = dev;
659  INIT_LIST_HEAD(&port->vlans);
660  for (i = 0; i < MACVLAN_HASH_SIZE; i++)
661  INIT_HLIST_HEAD(&port->vlan_hash[i]);
662 
663  err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
664  if (err)
665  kfree(port);
666  else
667  dev->priv_flags |= IFF_MACVLAN_PORT;
668  return err;
669 }
670 
671 static void macvlan_port_destroy(struct net_device *dev)
672 {
673  struct macvlan_port *port = macvlan_port_get(dev);
674 
675  dev->priv_flags &= ~IFF_MACVLAN_PORT;
676  netdev_rx_handler_unregister(dev);
677  kfree_rcu(port, rcu);
678 }
679 
680 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
681 {
682  if (tb[IFLA_ADDRESS]) {
683  if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
684  return -EINVAL;
685  if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
686  return -EADDRNOTAVAIL;
687  }
688 
689  if (data && data[IFLA_MACVLAN_MODE]) {
690  switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
691  case MACVLAN_MODE_PRIVATE:
692  case MACVLAN_MODE_VEPA:
693  case MACVLAN_MODE_BRIDGE:
694  case MACVLAN_MODE_PASSTHRU:
695  break;
696  default:
697  return -EINVAL;
698  }
699  }
700  return 0;
701 }
702 
703 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
704  struct nlattr *tb[], struct nlattr *data[],
705  int (*receive)(struct sk_buff *skb),
706  int (*forward)(struct net_device *dev,
707  struct sk_buff *skb))
708 {
709  struct macvlan_dev *vlan = netdev_priv(dev);
710  struct macvlan_port *port;
711  struct net_device *lowerdev;
712  int err;
713 
714  if (!tb[IFLA_LINK])
715  return -EINVAL;
716 
717  lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
718  if (lowerdev == NULL)
719  return -ENODEV;
720 
721  /* When creating macvlans on top of other macvlans - use
722  * the real device as the lowerdev.
723  */
724  if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
725  struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
726  lowerdev = lowervlan->lowerdev;
727  }
728 
729  if (!tb[IFLA_MTU])
730  dev->mtu = lowerdev->mtu;
731  else if (dev->mtu > lowerdev->mtu)
732  return -EINVAL;
733 
734  if (!tb[IFLA_ADDRESS])
735  eth_hw_addr_random(dev);
736 
737  if (!macvlan_port_exists(lowerdev)) {
738  err = macvlan_port_create(lowerdev);
739  if (err < 0)
740  return err;
741  }
742  port = macvlan_port_get(lowerdev);
743 
744  /* Only 1 macvlan device can be created in passthru mode */
745  if (port->passthru)
746  return -EINVAL;
747 
748  vlan->lowerdev = lowerdev;
749  vlan->dev = dev;
750  vlan->port = port;
751  vlan->receive = receive;
752  vlan->forward = forward;
753 
754  vlan->mode = MACVLAN_MODE_VEPA;
755  if (data && data[IFLA_MACVLAN_MODE])
756  vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
757 
758  if (data && data[IFLA_MACVLAN_FLAGS])
759  vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
760 
761  if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
762  if (port->count)
763  return -EINVAL;
764  port->passthru = true;
765  memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
766  }
767 
768  port->count += 1;
769  err = register_netdevice(dev);
770  if (err < 0)
771  goto destroy_port;
772 
773  list_add_tail(&vlan->list, &port->vlans);
774  netif_stacked_transfer_operstate(lowerdev, dev);
775 
776  return 0;
777 
778 destroy_port:
779  port->count -= 1;
780  if (!port->count)
781  macvlan_port_destroy(lowerdev);
782 
783  return err;
784 }
785 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
786 
787 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
788  struct nlattr *tb[], struct nlattr *data[])
789 {
790  return macvlan_common_newlink(src_net, dev, tb, data,
791  netif_rx,
792  dev_forward_skb);
793 }
794 
795 void macvlan_dellink(struct net_device *dev, struct list_head *head)
796 {
797  struct macvlan_dev *vlan = netdev_priv(dev);
798 
799  list_del(&vlan->list);
800  unregister_netdevice_queue(dev, head);
801 }
802 EXPORT_SYMBOL_GPL(macvlan_dellink);
803 
804 static int macvlan_changelink(struct net_device *dev,
805  struct nlattr *tb[], struct nlattr *data[])
806 {
807  struct macvlan_dev *vlan = netdev_priv(dev);
808  if (data && data[IFLA_MACVLAN_MODE])
809  vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
810  if (data && data[IFLA_MACVLAN_FLAGS]) {
811  __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
812  bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
813 
814  if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
815  dev_set_promiscuity(vlan->lowerdev, -1);
816  else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
817  dev_set_promiscuity(vlan->lowerdev, 1);
818  vlan->flags = flags;
819  }
820  return 0;
821 }
822 
823 static size_t macvlan_get_size(const struct net_device *dev)
824 {
825  return nla_total_size(4);
826 }
827 
828 static int macvlan_fill_info(struct sk_buff *skb,
829  const struct net_device *dev)
830 {
831  struct macvlan_dev *vlan = netdev_priv(dev);
832 
833  if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
834  goto nla_put_failure;
835  if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
836  goto nla_put_failure;
837  return 0;
838 
839 nla_put_failure:
840  return -EMSGSIZE;
841 }
842 
843 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
844  [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
845  [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
846 };
847 
848 int macvlan_link_register(struct rtnl_link_ops *ops)
849 {
850  /* common fields */
851  ops->priv_size = sizeof(struct macvlan_dev);
852  ops->validate = macvlan_validate;
853  ops->maxtype = IFLA_MACVLAN_MAX;
854  ops->policy = macvlan_policy;
855  ops->changelink = macvlan_changelink;
856  ops->get_size = macvlan_get_size;
857  ops->fill_info = macvlan_fill_info;
858 
859  return rtnl_link_register(ops);
860 };
861 EXPORT_SYMBOL_GPL(macvlan_link_register);
862 
863 static struct rtnl_link_ops macvlan_link_ops = {
864  .kind = "macvlan",
865  .setup = macvlan_setup,
866  .newlink = macvlan_newlink,
867  .dellink = macvlan_dellink,
868 };
869 
870 static int macvlan_device_event(struct notifier_block *unused,
871  unsigned long event, void *ptr)
872 {
873  struct net_device *dev = ptr;
874  struct macvlan_dev *vlan, *next;
875  struct macvlan_port *port;
876  LIST_HEAD(list_kill);
877 
878  if (!macvlan_port_exists(dev))
879  return NOTIFY_DONE;
880 
881  port = macvlan_port_get(dev);
882 
883  switch (event) {
884  case NETDEV_CHANGE:
885  list_for_each_entry(vlan, &port->vlans, list)
886  netif_stacked_transfer_operstate(vlan->lowerdev,
887  vlan->dev);
888  break;
889  case NETDEV_FEAT_CHANGE:
890  list_for_each_entry(vlan, &port->vlans, list) {
891  vlan->dev->features = dev->features & MACVLAN_FEATURES;
892  vlan->dev->gso_max_size = dev->gso_max_size;
893  netdev_features_change(vlan->dev);
894  }
895  break;
896  case NETDEV_UNREGISTER:
897  /* twiddle thumbs on netns device moves */
898  if (dev->reg_state != NETREG_UNREGISTERING)
899  break;
900 
901  list_for_each_entry_safe(vlan, next, &port->vlans, list)
902  vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
903  unregister_netdevice_many(&list_kill);
904  list_del(&list_kill);
905  break;
906  case NETDEV_PRE_TYPE_CHANGE:
907  /* Forbid underlaying device to change its type. */
908  return NOTIFY_BAD;
909  }
910  return NOTIFY_DONE;
911 }
912 
913 static struct notifier_block macvlan_notifier_block __read_mostly = {
914  .notifier_call = macvlan_device_event,
915 };
916 
917 static int __init macvlan_init_module(void)
918 {
919  int err;
920 
921  register_netdevice_notifier(&macvlan_notifier_block);
922 
923  err = macvlan_link_register(&macvlan_link_ops);
924  if (err < 0)
925  goto err1;
926  return 0;
927 err1:
928  unregister_netdevice_notifier(&macvlan_notifier_block);
929  return err;
930 }
931 
932 static void __exit macvlan_cleanup_module(void)
933 {
934  rtnl_link_unregister(&macvlan_link_ops);
935  unregister_netdevice_notifier(&macvlan_notifier_block);
936 }
937 
938 module_init(macvlan_init_module);
939 module_exit(macvlan_cleanup_module);
940 
941 MODULE_LICENSE("GPL");
942 MODULE_AUTHOR("Patrick McHardy <[email protected]>");
943 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
944 MODULE_ALIAS_RTNL_LINK("macvlan");
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