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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
33#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
34
35struct macvlan_port {
36 struct net_device *dev;
37 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
38 struct list_head vlans;
39};
40
41struct macvlan_dev {
42 struct net_device *dev;
43 struct list_head list;
44 struct hlist_node hlist;
45 struct macvlan_port *port;
46 struct net_device *lowerdev;
47};
48
49
50static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
51 const unsigned char *addr)
52{
53 struct macvlan_dev *vlan;
54 struct hlist_node *n;
55
56 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
57 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
58 return vlan;
59 }
60 return NULL;
61}
62
63static void macvlan_hash_add(struct macvlan_dev *vlan)
64{
65 struct macvlan_port *port = vlan->port;
66 const unsigned char *addr = vlan->dev->dev_addr;
67
68 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
69}
70
71static void macvlan_hash_del(struct macvlan_dev *vlan)
72{
73 hlist_del_rcu(&vlan->hlist);
74 synchronize_rcu();
75}
76
77static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
78 const unsigned char *addr)
79{
80 macvlan_hash_del(vlan);
81
82
83
84 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
85 macvlan_hash_add(vlan);
86}
87
88static int macvlan_addr_busy(const struct macvlan_port *port,
89 const unsigned char *addr)
90{
91
92
93
94
95 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
96 return 1;
97
98 if (macvlan_hash_lookup(port, addr))
99 return 1;
100
101 return 0;
102}
103
104static void macvlan_broadcast(struct sk_buff *skb,
105 const struct macvlan_port *port)
106{
107 const struct ethhdr *eth = eth_hdr(skb);
108 const struct macvlan_dev *vlan;
109 struct hlist_node *n;
110 struct net_device *dev;
111 struct sk_buff *nskb;
112 unsigned int i;
113
114 if (skb->protocol == htons(ETH_P_PAUSE))
115 return;
116
117 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
118 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
119 dev = vlan->dev;
120
121 nskb = skb_clone(skb, GFP_ATOMIC);
122 if (nskb == NULL) {
123 dev->stats.rx_errors++;
124 dev->stats.rx_dropped++;
125 continue;
126 }
127
128 dev->stats.rx_bytes += skb->len + ETH_HLEN;
129 dev->stats.rx_packets++;
130 dev->stats.multicast++;
131
132 nskb->dev = dev;
133 if (!compare_ether_addr_64bits(eth->h_dest, dev->broadcast))
134 nskb->pkt_type = PACKET_BROADCAST;
135 else
136 nskb->pkt_type = PACKET_MULTICAST;
137
138 netif_rx(nskb);
139 }
140 }
141}
142
143
144static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
145{
146 const struct ethhdr *eth = eth_hdr(skb);
147 const struct macvlan_port *port;
148 const struct macvlan_dev *vlan;
149 struct net_device *dev;
150
151 port = rcu_dereference(skb->dev->macvlan_port);
152 if (port == NULL)
153 return skb;
154
155 if (is_multicast_ether_addr(eth->h_dest)) {
156 macvlan_broadcast(skb, port);
157 return skb;
158 }
159
160 vlan = macvlan_hash_lookup(port, eth->h_dest);
161 if (vlan == NULL)
162 return skb;
163
164 dev = vlan->dev;
165 if (unlikely(!(dev->flags & IFF_UP))) {
166 kfree_skb(skb);
167 return NULL;
168 }
169
170 skb = skb_share_check(skb, GFP_ATOMIC);
171 if (skb == NULL) {
172 dev->stats.rx_errors++;
173 dev->stats.rx_dropped++;
174 return NULL;
175 }
176
177 dev->stats.rx_bytes += skb->len + ETH_HLEN;
178 dev->stats.rx_packets++;
179
180 skb->dev = dev;
181 skb->pkt_type = PACKET_HOST;
182
183 netif_rx(skb);
184 return NULL;
185}
186
187static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
188 struct net_device *dev)
189{
190 int i = skb_get_queue_mapping(skb);
191 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
192 const struct macvlan_dev *vlan = netdev_priv(dev);
193 unsigned int len = skb->len;
194 int ret;
195
196 skb->dev = vlan->lowerdev;
197 ret = dev_queue_xmit(skb);
198
199 if (likely(ret == NET_XMIT_SUCCESS)) {
200 txq->tx_packets++;
201 txq->tx_bytes += len;
202 } else
203 txq->tx_dropped++;
204
205 return NETDEV_TX_OK;
206}
207
208static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
209 unsigned short type, const void *daddr,
210 const void *saddr, unsigned len)
211{
212 const struct macvlan_dev *vlan = netdev_priv(dev);
213 struct net_device *lowerdev = vlan->lowerdev;
214
215 return dev_hard_header(skb, lowerdev, type, daddr,
216 saddr ? : dev->dev_addr, len);
217}
218
219static const struct header_ops macvlan_hard_header_ops = {
220 .create = macvlan_hard_header,
221 .rebuild = eth_rebuild_header,
222 .parse = eth_header_parse,
223 .cache = eth_header_cache,
224 .cache_update = eth_header_cache_update,
225};
226
227static int macvlan_open(struct net_device *dev)
228{
229 struct macvlan_dev *vlan = netdev_priv(dev);
230 struct net_device *lowerdev = vlan->lowerdev;
231 int err;
232
233 err = -EBUSY;
234 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
235 goto out;
236
237 err = dev_unicast_add(lowerdev, dev->dev_addr);
238 if (err < 0)
239 goto out;
240 if (dev->flags & IFF_ALLMULTI) {
241 err = dev_set_allmulti(lowerdev, 1);
242 if (err < 0)
243 goto del_unicast;
244 }
245 macvlan_hash_add(vlan);
246 return 0;
247
248del_unicast:
249 dev_unicast_delete(lowerdev, dev->dev_addr);
250out:
251 return err;
252}
253
254static int macvlan_stop(struct net_device *dev)
255{
256 struct macvlan_dev *vlan = netdev_priv(dev);
257 struct net_device *lowerdev = vlan->lowerdev;
258
259 dev_mc_unsync(lowerdev, dev);
260 if (dev->flags & IFF_ALLMULTI)
261 dev_set_allmulti(lowerdev, -1);
262
263 dev_unicast_delete(lowerdev, dev->dev_addr);
264
265 macvlan_hash_del(vlan);
266 return 0;
267}
268
269static int macvlan_set_mac_address(struct net_device *dev, void *p)
270{
271 struct macvlan_dev *vlan = netdev_priv(dev);
272 struct net_device *lowerdev = vlan->lowerdev;
273 struct sockaddr *addr = p;
274 int err;
275
276 if (!is_valid_ether_addr(addr->sa_data))
277 return -EADDRNOTAVAIL;
278
279 if (!(dev->flags & IFF_UP)) {
280
281 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
282 } else {
283
284 if (macvlan_addr_busy(vlan->port, addr->sa_data))
285 return -EBUSY;
286
287 err = dev_unicast_add(lowerdev, addr->sa_data);
288 if (err)
289 return err;
290
291 dev_unicast_delete(lowerdev, dev->dev_addr);
292
293 macvlan_hash_change_addr(vlan, addr->sa_data);
294 }
295 return 0;
296}
297
298static void macvlan_change_rx_flags(struct net_device *dev, int change)
299{
300 struct macvlan_dev *vlan = netdev_priv(dev);
301 struct net_device *lowerdev = vlan->lowerdev;
302
303 if (change & IFF_ALLMULTI)
304 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
305}
306
307static void macvlan_set_multicast_list(struct net_device *dev)
308{
309 struct macvlan_dev *vlan = netdev_priv(dev);
310
311 dev_mc_sync(vlan->lowerdev, dev);
312}
313
314static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
315{
316 struct macvlan_dev *vlan = netdev_priv(dev);
317
318 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
319 return -EINVAL;
320 dev->mtu = new_mtu;
321 return 0;
322}
323
324
325
326
327
328
329static struct lock_class_key macvlan_netdev_xmit_lock_key;
330static struct lock_class_key macvlan_netdev_addr_lock_key;
331
332#define MACVLAN_FEATURES \
333 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
334 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
335 NETIF_F_TSO_ECN | NETIF_F_TSO6)
336
337#define MACVLAN_STATE_MASK \
338 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
339
340static void macvlan_set_lockdep_class_one(struct net_device *dev,
341 struct netdev_queue *txq,
342 void *_unused)
343{
344 lockdep_set_class(&txq->_xmit_lock,
345 &macvlan_netdev_xmit_lock_key);
346}
347
348static void macvlan_set_lockdep_class(struct net_device *dev)
349{
350 lockdep_set_class(&dev->addr_list_lock,
351 &macvlan_netdev_addr_lock_key);
352 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
353}
354
355static int macvlan_init(struct net_device *dev)
356{
357 struct macvlan_dev *vlan = netdev_priv(dev);
358 const struct net_device *lowerdev = vlan->lowerdev;
359
360 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
361 (lowerdev->state & MACVLAN_STATE_MASK);
362 dev->features = lowerdev->features & MACVLAN_FEATURES;
363 dev->gso_max_size = lowerdev->gso_max_size;
364 dev->iflink = lowerdev->ifindex;
365 dev->hard_header_len = lowerdev->hard_header_len;
366
367 macvlan_set_lockdep_class(dev);
368
369 return 0;
370}
371
372static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
373 struct ethtool_drvinfo *drvinfo)
374{
375 snprintf(drvinfo->driver, 32, "macvlan");
376 snprintf(drvinfo->version, 32, "0.1");
377}
378
379static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
380{
381 const struct macvlan_dev *vlan = netdev_priv(dev);
382 return dev_ethtool_get_rx_csum(vlan->lowerdev);
383}
384
385static int macvlan_ethtool_get_settings(struct net_device *dev,
386 struct ethtool_cmd *cmd)
387{
388 const struct macvlan_dev *vlan = netdev_priv(dev);
389 return dev_ethtool_get_settings(vlan->lowerdev, cmd);
390}
391
392static u32 macvlan_ethtool_get_flags(struct net_device *dev)
393{
394 const struct macvlan_dev *vlan = netdev_priv(dev);
395 return dev_ethtool_get_flags(vlan->lowerdev);
396}
397
398static const struct ethtool_ops macvlan_ethtool_ops = {
399 .get_link = ethtool_op_get_link,
400 .get_settings = macvlan_ethtool_get_settings,
401 .get_rx_csum = macvlan_ethtool_get_rx_csum,
402 .get_drvinfo = macvlan_ethtool_get_drvinfo,
403 .get_flags = macvlan_ethtool_get_flags,
404};
405
406static const struct net_device_ops macvlan_netdev_ops = {
407 .ndo_init = macvlan_init,
408 .ndo_open = macvlan_open,
409 .ndo_stop = macvlan_stop,
410 .ndo_start_xmit = macvlan_start_xmit,
411 .ndo_change_mtu = macvlan_change_mtu,
412 .ndo_change_rx_flags = macvlan_change_rx_flags,
413 .ndo_set_mac_address = macvlan_set_mac_address,
414 .ndo_set_multicast_list = macvlan_set_multicast_list,
415 .ndo_validate_addr = eth_validate_addr,
416};
417
418static void macvlan_setup(struct net_device *dev)
419{
420 ether_setup(dev);
421
422 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
423 dev->netdev_ops = &macvlan_netdev_ops;
424 dev->destructor = free_netdev;
425 dev->header_ops = &macvlan_hard_header_ops,
426 dev->ethtool_ops = &macvlan_ethtool_ops;
427 dev->tx_queue_len = 0;
428}
429
430static int macvlan_port_create(struct net_device *dev)
431{
432 struct macvlan_port *port;
433 unsigned int i;
434
435 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
436 return -EINVAL;
437
438 port = kzalloc(sizeof(*port), GFP_KERNEL);
439 if (port == NULL)
440 return -ENOMEM;
441
442 port->dev = dev;
443 INIT_LIST_HEAD(&port->vlans);
444 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
445 INIT_HLIST_HEAD(&port->vlan_hash[i]);
446 rcu_assign_pointer(dev->macvlan_port, port);
447 return 0;
448}
449
450static void macvlan_port_destroy(struct net_device *dev)
451{
452 struct macvlan_port *port = dev->macvlan_port;
453
454 rcu_assign_pointer(dev->macvlan_port, NULL);
455 synchronize_rcu();
456 kfree(port);
457}
458
459static void macvlan_transfer_operstate(struct net_device *dev)
460{
461 struct macvlan_dev *vlan = netdev_priv(dev);
462 const struct net_device *lowerdev = vlan->lowerdev;
463
464 if (lowerdev->operstate == IF_OPER_DORMANT)
465 netif_dormant_on(dev);
466 else
467 netif_dormant_off(dev);
468
469 if (netif_carrier_ok(lowerdev)) {
470 if (!netif_carrier_ok(dev))
471 netif_carrier_on(dev);
472 } else {
473 if (netif_carrier_ok(dev))
474 netif_carrier_off(dev);
475 }
476}
477
478static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
479{
480 if (tb[IFLA_ADDRESS]) {
481 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
482 return -EINVAL;
483 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
484 return -EADDRNOTAVAIL;
485 }
486 return 0;
487}
488
489static int macvlan_get_tx_queues(struct net *net,
490 struct nlattr *tb[],
491 unsigned int *num_tx_queues,
492 unsigned int *real_num_tx_queues)
493{
494 struct net_device *real_dev;
495
496 if (!tb[IFLA_LINK])
497 return -EINVAL;
498
499 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
500 if (!real_dev)
501 return -ENODEV;
502
503 *num_tx_queues = real_dev->num_tx_queues;
504 *real_num_tx_queues = real_dev->real_num_tx_queues;
505 return 0;
506}
507
508static int macvlan_newlink(struct net_device *dev,
509 struct nlattr *tb[], struct nlattr *data[])
510{
511 struct macvlan_dev *vlan = netdev_priv(dev);
512 struct macvlan_port *port;
513 struct net_device *lowerdev;
514 int err;
515
516 if (!tb[IFLA_LINK])
517 return -EINVAL;
518
519 lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
520 if (lowerdev == NULL)
521 return -ENODEV;
522
523
524
525
526 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
527 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
528 lowerdev = lowervlan->lowerdev;
529 }
530
531 if (!tb[IFLA_MTU])
532 dev->mtu = lowerdev->mtu;
533 else if (dev->mtu > lowerdev->mtu)
534 return -EINVAL;
535
536 if (!tb[IFLA_ADDRESS])
537 random_ether_addr(dev->dev_addr);
538
539 if (lowerdev->macvlan_port == NULL) {
540 err = macvlan_port_create(lowerdev);
541 if (err < 0)
542 return err;
543 }
544 port = lowerdev->macvlan_port;
545
546 vlan->lowerdev = lowerdev;
547 vlan->dev = dev;
548 vlan->port = port;
549
550 err = register_netdevice(dev);
551 if (err < 0)
552 return err;
553
554 list_add_tail(&vlan->list, &port->vlans);
555 macvlan_transfer_operstate(dev);
556 return 0;
557}
558
559static void macvlan_dellink(struct net_device *dev)
560{
561 struct macvlan_dev *vlan = netdev_priv(dev);
562 struct macvlan_port *port = vlan->port;
563
564 list_del(&vlan->list);
565 unregister_netdevice(dev);
566
567 if (list_empty(&port->vlans))
568 macvlan_port_destroy(port->dev);
569}
570
571static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
572 .kind = "macvlan",
573 .priv_size = sizeof(struct macvlan_dev),
574 .get_tx_queues = macvlan_get_tx_queues,
575 .setup = macvlan_setup,
576 .validate = macvlan_validate,
577 .newlink = macvlan_newlink,
578 .dellink = macvlan_dellink,
579};
580
581static int macvlan_device_event(struct notifier_block *unused,
582 unsigned long event, void *ptr)
583{
584 struct net_device *dev = ptr;
585 struct macvlan_dev *vlan, *next;
586 struct macvlan_port *port;
587
588 port = dev->macvlan_port;
589 if (port == NULL)
590 return NOTIFY_DONE;
591
592 switch (event) {
593 case NETDEV_CHANGE:
594 list_for_each_entry(vlan, &port->vlans, list)
595 macvlan_transfer_operstate(vlan->dev);
596 break;
597 case NETDEV_FEAT_CHANGE:
598 list_for_each_entry(vlan, &port->vlans, list) {
599 vlan->dev->features = dev->features & MACVLAN_FEATURES;
600 vlan->dev->gso_max_size = dev->gso_max_size;
601 netdev_features_change(vlan->dev);
602 }
603 break;
604 case NETDEV_UNREGISTER:
605 list_for_each_entry_safe(vlan, next, &port->vlans, list)
606 macvlan_dellink(vlan->dev);
607 break;
608 }
609 return NOTIFY_DONE;
610}
611
612static struct notifier_block macvlan_notifier_block __read_mostly = {
613 .notifier_call = macvlan_device_event,
614};
615
616static int __init macvlan_init_module(void)
617{
618 int err;
619
620 register_netdevice_notifier(&macvlan_notifier_block);
621 macvlan_handle_frame_hook = macvlan_handle_frame;
622
623 err = rtnl_link_register(&macvlan_link_ops);
624 if (err < 0)
625 goto err1;
626 return 0;
627err1:
628 macvlan_handle_frame_hook = NULL;
629 unregister_netdevice_notifier(&macvlan_notifier_block);
630 return err;
631}
632
633static void __exit macvlan_cleanup_module(void)
634{
635 rtnl_link_unregister(&macvlan_link_ops);
636 macvlan_handle_frame_hook = NULL;
637 unregister_netdevice_notifier(&macvlan_notifier_block);
638}
639
640module_init(macvlan_init_module);
641module_exit(macvlan_cleanup_module);
642
643MODULE_LICENSE("GPL");
644MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
645MODULE_DESCRIPTION("Driver for MAC address based VLANs");
646MODULE_ALIAS_RTNL_LINK("macvlan");
647
