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sfc: Don't use enums as a bitmask.
[zen-stable.git] / drivers / net / macvlan.c
blobd7c0bc62da7fd56584fc4c265a79b8f301d72fc5
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 struct rcu_head rcu;
41 bool passthru;
42 int count;
43 };
44
45 static void macvlan_port_destroy(struct net_device *dev);
46
47 #define macvlan_port_get_rcu(dev) \
48 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
49 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
50 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
51
52 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
53 const unsigned char *addr)
54 {
55 struct macvlan_dev *vlan;
56 struct hlist_node *n;
57
58 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
59 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
60 return vlan;
61 }
62 return NULL;
63 }
64
65 static void macvlan_hash_add(struct macvlan_dev *vlan)
66 {
67 struct macvlan_port *port = vlan->port;
68 const unsigned char *addr = vlan->dev->dev_addr;
69
70 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
71 }
72
73 static void macvlan_hash_del(struct macvlan_dev *vlan)
74 {
75 hlist_del_rcu(&vlan->hlist);
76 synchronize_rcu();
77 }
78
79 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
80 const unsigned char *addr)
81 {
82 macvlan_hash_del(vlan);
83 /* Now that we are unhashed it is safe to change the device
84 * address without confusing packet delivery.
85 */
86 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
87 macvlan_hash_add(vlan);
88 }
89
90 static int macvlan_addr_busy(const struct macvlan_port *port,
91 const unsigned char *addr)
92 {
93 /* Test to see if the specified multicast address is
94 * currently in use by the underlying device or
95 * another macvlan.
96 */
97 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
98 return 1;
99
100 if (macvlan_hash_lookup(port, addr))
101 return 1;
102
103 return 0;
104 }
105
106
107 static int macvlan_broadcast_one(struct sk_buff *skb,
108 const struct macvlan_dev *vlan,
109 const struct ethhdr *eth, bool local)
110 {
111 struct net_device *dev = vlan->dev;
112 if (!skb)
113 return NET_RX_DROP;
114
115 if (local)
116 return vlan->forward(dev, skb);
117
118 skb->dev = dev;
119 if (!compare_ether_addr_64bits(eth->h_dest,
120 dev->broadcast))
121 skb->pkt_type = PACKET_BROADCAST;
122 else
123 skb->pkt_type = PACKET_MULTICAST;
124
125 return vlan->receive(skb);
126 }
127
128 static void macvlan_broadcast(struct sk_buff *skb,
129 const struct macvlan_port *port,
130 struct net_device *src,
131 enum macvlan_mode mode)
132 {
133 const struct ethhdr *eth = eth_hdr(skb);
134 const struct macvlan_dev *vlan;
135 struct hlist_node *n;
136 struct sk_buff *nskb;
137 unsigned int i;
138 int err;
139
140 if (skb->protocol == htons(ETH_P_PAUSE))
141 return;
142
143 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
144 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
145 if (vlan->dev == src || !(vlan->mode & mode))
146 continue;
147
148 nskb = skb_clone(skb, GFP_ATOMIC);
149 err = macvlan_broadcast_one(nskb, vlan, eth,
150 mode == MACVLAN_MODE_BRIDGE);
151 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
152 err == NET_RX_SUCCESS, 1);
153 }
154 }
155 }
156
157 /* called under rcu_read_lock() from netif_receive_skb */
158 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
159 {
160 struct macvlan_port *port;
161 struct sk_buff *skb = *pskb;
162 const struct ethhdr *eth = eth_hdr(skb);
163 const struct macvlan_dev *vlan;
164 const struct macvlan_dev *src;
165 struct net_device *dev;
166 unsigned int len = 0;
167 int ret = NET_RX_DROP;
168
169 port = macvlan_port_get_rcu(skb->dev);
170 if (is_multicast_ether_addr(eth->h_dest)) {
171 src = macvlan_hash_lookup(port, eth->h_source);
172 if (!src)
173 /* frame comes from an external address */
174 macvlan_broadcast(skb, port, NULL,
175 MACVLAN_MODE_PRIVATE |
176 MACVLAN_MODE_VEPA |
177 MACVLAN_MODE_PASSTHRU|
178 MACVLAN_MODE_BRIDGE);
179 else if (src->mode == MACVLAN_MODE_VEPA)
180 /* flood to everyone except source */
181 macvlan_broadcast(skb, port, src->dev,
182 MACVLAN_MODE_VEPA |
183 MACVLAN_MODE_BRIDGE);
184 else if (src->mode == MACVLAN_MODE_BRIDGE)
185 /*
186 * flood only to VEPA ports, bridge ports
187 * already saw the frame on the way out.
188 */
189 macvlan_broadcast(skb, port, src->dev,
190 MACVLAN_MODE_VEPA);
191 return RX_HANDLER_PASS;
192 }
193
194 if (port->passthru)
195 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
196 else
197 vlan = macvlan_hash_lookup(port, eth->h_dest);
198 if (vlan == NULL)
199 return RX_HANDLER_PASS;
200
201 dev = vlan->dev;
202 if (unlikely(!(dev->flags & IFF_UP))) {
203 kfree_skb(skb);
204 return RX_HANDLER_CONSUMED;
205 }
206 len = skb->len + ETH_HLEN;
207 skb = skb_share_check(skb, GFP_ATOMIC);
208 if (!skb)
209 goto out;
210
211 skb->dev = dev;
212 skb->pkt_type = PACKET_HOST;
213
214 ret = vlan->receive(skb);
215
216 out:
217 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
218 return RX_HANDLER_CONSUMED;
219 }
220
221 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
222 {
223 const struct macvlan_dev *vlan = netdev_priv(dev);
224 const struct macvlan_port *port = vlan->port;
225 const struct macvlan_dev *dest;
226 __u8 ip_summed = skb->ip_summed;
227
228 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
229 const struct ethhdr *eth = (void *)skb->data;
230 skb->ip_summed = CHECKSUM_UNNECESSARY;
231
232 /* send to other bridge ports directly */
233 if (is_multicast_ether_addr(eth->h_dest)) {
234 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
235 goto xmit_world;
236 }
237
238 dest = macvlan_hash_lookup(port, eth->h_dest);
239 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
240 unsigned int length = skb->len + ETH_HLEN;
241 int ret = dest->forward(dest->dev, skb);
242 macvlan_count_rx(dest, length,
243 ret == NET_RX_SUCCESS, 0);
244
245 return NET_XMIT_SUCCESS;
246 }
247 }
248
249 xmit_world:
250 skb->ip_summed = ip_summed;
251 skb_set_dev(skb, vlan->lowerdev);
252 return dev_queue_xmit(skb);
253 }
254
255 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
256 struct net_device *dev)
257 {
258 unsigned int len = skb->len;
259 int ret;
260 const struct macvlan_dev *vlan = netdev_priv(dev);
261
262 ret = macvlan_queue_xmit(skb, dev);
263 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
264 struct macvlan_pcpu_stats *pcpu_stats;
265
266 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
267 u64_stats_update_begin(&pcpu_stats->syncp);
268 pcpu_stats->tx_packets++;
269 pcpu_stats->tx_bytes += len;
270 u64_stats_update_end(&pcpu_stats->syncp);
271 } else {
272 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
273 }
274 return ret;
275 }
276 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
277
278 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
279 unsigned short type, const void *daddr,
280 const void *saddr, unsigned len)
281 {
282 const struct macvlan_dev *vlan = netdev_priv(dev);
283 struct net_device *lowerdev = vlan->lowerdev;
284
285 return dev_hard_header(skb, lowerdev, type, daddr,
286 saddr ? : dev->dev_addr, len);
287 }
288
289 static const struct header_ops macvlan_hard_header_ops = {
290 .create = macvlan_hard_header,
291 .rebuild = eth_rebuild_header,
292 .parse = eth_header_parse,
293 .cache = eth_header_cache,
294 .cache_update = eth_header_cache_update,
295 };
296
297 static int macvlan_open(struct net_device *dev)
298 {
299 struct macvlan_dev *vlan = netdev_priv(dev);
300 struct net_device *lowerdev = vlan->lowerdev;
301 int err;
302
303 if (vlan->port->passthru) {
304 dev_set_promiscuity(lowerdev, 1);
305 goto hash_add;
306 }
307
308 err = -EBUSY;
309 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
310 goto out;
311
312 err = dev_uc_add(lowerdev, dev->dev_addr);
313 if (err < 0)
314 goto out;
315 if (dev->flags & IFF_ALLMULTI) {
316 err = dev_set_allmulti(lowerdev, 1);
317 if (err < 0)
318 goto del_unicast;
319 }
320
321 hash_add:
322 macvlan_hash_add(vlan);
323 return 0;
324
325 del_unicast:
326 dev_uc_del(lowerdev, dev->dev_addr);
327 out:
328 return err;
329 }
330
331 static int macvlan_stop(struct net_device *dev)
332 {
333 struct macvlan_dev *vlan = netdev_priv(dev);
334 struct net_device *lowerdev = vlan->lowerdev;
335
336 if (vlan->port->passthru) {
337 dev_set_promiscuity(lowerdev, -1);
338 goto hash_del;
339 }
340
341 dev_mc_unsync(lowerdev, dev);
342 if (dev->flags & IFF_ALLMULTI)
343 dev_set_allmulti(lowerdev, -1);
344
345 dev_uc_del(lowerdev, dev->dev_addr);
346
347 hash_del:
348 macvlan_hash_del(vlan);
349 return 0;
350 }
351
352 static int macvlan_set_mac_address(struct net_device *dev, void *p)
353 {
354 struct macvlan_dev *vlan = netdev_priv(dev);
355 struct net_device *lowerdev = vlan->lowerdev;
356 struct sockaddr *addr = p;
357 int err;
358
359 if (!is_valid_ether_addr(addr->sa_data))
360 return -EADDRNOTAVAIL;
361
362 if (!(dev->flags & IFF_UP)) {
363 /* Just copy in the new address */
364 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
365 } else {
366 /* Rehash and update the device filters */
367 if (macvlan_addr_busy(vlan->port, addr->sa_data))
368 return -EBUSY;
369
370 err = dev_uc_add(lowerdev, addr->sa_data);
371 if (err)
372 return err;
373
374 dev_uc_del(lowerdev, dev->dev_addr);
375
376 macvlan_hash_change_addr(vlan, addr->sa_data);
377 }
378 return 0;
379 }
380
381 static void macvlan_change_rx_flags(struct net_device *dev, int change)
382 {
383 struct macvlan_dev *vlan = netdev_priv(dev);
384 struct net_device *lowerdev = vlan->lowerdev;
385
386 if (change & IFF_ALLMULTI)
387 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
388 }
389
390 static void macvlan_set_multicast_list(struct net_device *dev)
391 {
392 struct macvlan_dev *vlan = netdev_priv(dev);
393
394 dev_mc_sync(vlan->lowerdev, dev);
395 }
396
397 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
398 {
399 struct macvlan_dev *vlan = netdev_priv(dev);
400
401 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
402 return -EINVAL;
403 dev->mtu = new_mtu;
404 return 0;
405 }
406
407 /*
408 * macvlan network devices have devices nesting below it and are a special
409 * "super class" of normal network devices; split their locks off into a
410 * separate class since they always nest.
411 */
412 static struct lock_class_key macvlan_netdev_xmit_lock_key;
413 static struct lock_class_key macvlan_netdev_addr_lock_key;
414
415 #define MACVLAN_FEATURES \
416 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
417 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
418 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM)
419
420 #define MACVLAN_STATE_MASK \
421 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
422
423 static void macvlan_set_lockdep_class_one(struct net_device *dev,
424 struct netdev_queue *txq,
425 void *_unused)
426 {
427 lockdep_set_class(&txq->_xmit_lock,
428 &macvlan_netdev_xmit_lock_key);
429 }
430
431 static void macvlan_set_lockdep_class(struct net_device *dev)
432 {
433 lockdep_set_class(&dev->addr_list_lock,
434 &macvlan_netdev_addr_lock_key);
435 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
436 }
437
438 static int macvlan_init(struct net_device *dev)
439 {
440 struct macvlan_dev *vlan = netdev_priv(dev);
441 const struct net_device *lowerdev = vlan->lowerdev;
442
443 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
444 (lowerdev->state & MACVLAN_STATE_MASK);
445 dev->features = lowerdev->features & MACVLAN_FEATURES;
446 dev->features |= NETIF_F_LLTX;
447 dev->gso_max_size = lowerdev->gso_max_size;
448 dev->iflink = lowerdev->ifindex;
449 dev->hard_header_len = lowerdev->hard_header_len;
450
451 macvlan_set_lockdep_class(dev);
452
453 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
454 if (!vlan->pcpu_stats)
455 return -ENOMEM;
456
457 return 0;
458 }
459
460 static void macvlan_uninit(struct net_device *dev)
461 {
462 struct macvlan_dev *vlan = netdev_priv(dev);
463 struct macvlan_port *port = vlan->port;
464
465 free_percpu(vlan->pcpu_stats);
466
467 port->count -= 1;
468 if (!port->count)
469 macvlan_port_destroy(port->dev);
470 }
471
472 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
473 struct rtnl_link_stats64 *stats)
474 {
475 struct macvlan_dev *vlan = netdev_priv(dev);
476
477 if (vlan->pcpu_stats) {
478 struct macvlan_pcpu_stats *p;
479 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
480 u32 rx_errors = 0, tx_dropped = 0;
481 unsigned int start;
482 int i;
483
484 for_each_possible_cpu(i) {
485 p = per_cpu_ptr(vlan->pcpu_stats, i);
486 do {
487 start = u64_stats_fetch_begin_bh(&p->syncp);
488 rx_packets = p->rx_packets;
489 rx_bytes = p->rx_bytes;
490 rx_multicast = p->rx_multicast;
491 tx_packets = p->tx_packets;
492 tx_bytes = p->tx_bytes;
493 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
494
495 stats->rx_packets += rx_packets;
496 stats->rx_bytes += rx_bytes;
497 stats->multicast += rx_multicast;
498 stats->tx_packets += tx_packets;
499 stats->tx_bytes += tx_bytes;
500 /* rx_errors & tx_dropped are u32, updated
501 * without syncp protection.
502 */
503 rx_errors += p->rx_errors;
504 tx_dropped += p->tx_dropped;
505 }
506 stats->rx_errors = rx_errors;
507 stats->rx_dropped = rx_errors;
508 stats->tx_dropped = tx_dropped;
509 }
510 return stats;
511 }
512
513 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
514 struct ethtool_drvinfo *drvinfo)
515 {
516 snprintf(drvinfo->driver, 32, "macvlan");
517 snprintf(drvinfo->version, 32, "0.1");
518 }
519
520 static int macvlan_ethtool_get_settings(struct net_device *dev,
521 struct ethtool_cmd *cmd)
522 {
523 const struct macvlan_dev *vlan = netdev_priv(dev);
524 return dev_ethtool_get_settings(vlan->lowerdev, cmd);
525 }
526
527 static const struct ethtool_ops macvlan_ethtool_ops = {
528 .get_link = ethtool_op_get_link,
529 .get_settings = macvlan_ethtool_get_settings,
530 .get_drvinfo = macvlan_ethtool_get_drvinfo,
531 };
532
533 static const struct net_device_ops macvlan_netdev_ops = {
534 .ndo_init = macvlan_init,
535 .ndo_uninit = macvlan_uninit,
536 .ndo_open = macvlan_open,
537 .ndo_stop = macvlan_stop,
538 .ndo_start_xmit = macvlan_start_xmit,
539 .ndo_change_mtu = macvlan_change_mtu,
540 .ndo_change_rx_flags = macvlan_change_rx_flags,
541 .ndo_set_mac_address = macvlan_set_mac_address,
542 .ndo_set_multicast_list = macvlan_set_multicast_list,
543 .ndo_get_stats64 = macvlan_dev_get_stats64,
544 .ndo_validate_addr = eth_validate_addr,
545 };
546
547 void macvlan_common_setup(struct net_device *dev)
548 {
549 ether_setup(dev);
550
551 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
552 dev->netdev_ops = &macvlan_netdev_ops;
553 dev->destructor = free_netdev;
554 dev->header_ops = &macvlan_hard_header_ops,
555 dev->ethtool_ops = &macvlan_ethtool_ops;
556 }
557 EXPORT_SYMBOL_GPL(macvlan_common_setup);
558
559 static void macvlan_setup(struct net_device *dev)
560 {
561 macvlan_common_setup(dev);
562 dev->tx_queue_len = 0;
563 }
564
565 static int macvlan_port_create(struct net_device *dev)
566 {
567 struct macvlan_port *port;
568 unsigned int i;
569 int err;
570
571 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
572 return -EINVAL;
573
574 port = kzalloc(sizeof(*port), GFP_KERNEL);
575 if (port == NULL)
576 return -ENOMEM;
577
578 port->passthru = false;
579 port->dev = dev;
580 INIT_LIST_HEAD(&port->vlans);
581 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
582 INIT_HLIST_HEAD(&port->vlan_hash[i]);
583
584 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
585 if (err)
586 kfree(port);
587
588 dev->priv_flags |= IFF_MACVLAN_PORT;
589 return err;
590 }
591
592 static void macvlan_port_rcu_free(struct rcu_head *head)
593 {
594 struct macvlan_port *port;
595
596 port = container_of(head, struct macvlan_port, rcu);
597 kfree(port);
598 }
599
600 static void macvlan_port_destroy(struct net_device *dev)
601 {
602 struct macvlan_port *port = macvlan_port_get(dev);
603
604 dev->priv_flags &= ~IFF_MACVLAN_PORT;
605 netdev_rx_handler_unregister(dev);
606 call_rcu(&port->rcu, macvlan_port_rcu_free);
607 }
608
609 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
610 {
611 if (tb[IFLA_ADDRESS]) {
612 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
613 return -EINVAL;
614 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
615 return -EADDRNOTAVAIL;
616 }
617
618 if (data && data[IFLA_MACVLAN_MODE]) {
619 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
620 case MACVLAN_MODE_PRIVATE:
621 case MACVLAN_MODE_VEPA:
622 case MACVLAN_MODE_BRIDGE:
623 case MACVLAN_MODE_PASSTHRU:
624 break;
625 default:
626 return -EINVAL;
627 }
628 }
629 return 0;
630 }
631
632 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
633 struct nlattr *tb[], struct nlattr *data[],
634 int (*receive)(struct sk_buff *skb),
635 int (*forward)(struct net_device *dev,
636 struct sk_buff *skb))
637 {
638 struct macvlan_dev *vlan = netdev_priv(dev);
639 struct macvlan_port *port;
640 struct net_device *lowerdev;
641 int err;
642
643 if (!tb[IFLA_LINK])
644 return -EINVAL;
645
646 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
647 if (lowerdev == NULL)
648 return -ENODEV;
649
650 /* When creating macvlans on top of other macvlans - use
651 * the real device as the lowerdev.
652 */
653 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
654 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
655 lowerdev = lowervlan->lowerdev;
656 }
657
658 if (!tb[IFLA_MTU])
659 dev->mtu = lowerdev->mtu;
660 else if (dev->mtu > lowerdev->mtu)
661 return -EINVAL;
662
663 if (!tb[IFLA_ADDRESS])
664 random_ether_addr(dev->dev_addr);
665
666 if (!macvlan_port_exists(lowerdev)) {
667 err = macvlan_port_create(lowerdev);
668 if (err < 0)
669 return err;
670 }
671 port = macvlan_port_get(lowerdev);
672
673 /* Only 1 macvlan device can be created in passthru mode */
674 if (port->passthru)
675 return -EINVAL;
676
677 vlan->lowerdev = lowerdev;
678 vlan->dev = dev;
679 vlan->port = port;
680 vlan->receive = receive;
681 vlan->forward = forward;
682
683 vlan->mode = MACVLAN_MODE_VEPA;
684 if (data && data[IFLA_MACVLAN_MODE])
685 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
686
687 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
688 if (port->count)
689 return -EINVAL;
690 port->passthru = true;
691 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
692 }
693
694 port->count += 1;
695 err = register_netdevice(dev);
696 if (err < 0)
697 goto destroy_port;
698
699 list_add_tail(&vlan->list, &port->vlans);
700 netif_stacked_transfer_operstate(lowerdev, dev);
701
702 return 0;
703
704 destroy_port:
705 port->count -= 1;
706 if (!port->count)
707 macvlan_port_destroy(lowerdev);
708
709 return err;
710 }
711 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
712
713 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
714 struct nlattr *tb[], struct nlattr *data[])
715 {
716 return macvlan_common_newlink(src_net, dev, tb, data,
717 netif_rx,
718 dev_forward_skb);
719 }
720
721 void macvlan_dellink(struct net_device *dev, struct list_head *head)
722 {
723 struct macvlan_dev *vlan = netdev_priv(dev);
724
725 list_del(&vlan->list);
726 unregister_netdevice_queue(dev, head);
727 }
728 EXPORT_SYMBOL_GPL(macvlan_dellink);
729
730 static int macvlan_changelink(struct net_device *dev,
731 struct nlattr *tb[], struct nlattr *data[])
732 {
733 struct macvlan_dev *vlan = netdev_priv(dev);
734 if (data && data[IFLA_MACVLAN_MODE])
735 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
736 return 0;
737 }
738
739 static size_t macvlan_get_size(const struct net_device *dev)
740 {
741 return nla_total_size(4);
742 }
743
744 static int macvlan_fill_info(struct sk_buff *skb,
745 const struct net_device *dev)
746 {
747 struct macvlan_dev *vlan = netdev_priv(dev);
748
749 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
750 return 0;
751
752 nla_put_failure:
753 return -EMSGSIZE;
754 }
755
756 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
757 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
758 };
759
760 int macvlan_link_register(struct rtnl_link_ops *ops)
761 {
762 /* common fields */
763 ops->priv_size = sizeof(struct macvlan_dev);
764 ops->validate = macvlan_validate;
765 ops->maxtype = IFLA_MACVLAN_MAX;
766 ops->policy = macvlan_policy;
767 ops->changelink = macvlan_changelink;
768 ops->get_size = macvlan_get_size;
769 ops->fill_info = macvlan_fill_info;
770
771 return rtnl_link_register(ops);
772 };
773 EXPORT_SYMBOL_GPL(macvlan_link_register);
774
775 static struct rtnl_link_ops macvlan_link_ops = {
776 .kind = "macvlan",
777 .setup = macvlan_setup,
778 .newlink = macvlan_newlink,
779 .dellink = macvlan_dellink,
780 };
781
782 static int macvlan_device_event(struct notifier_block *unused,
783 unsigned long event, void *ptr)
784 {
785 struct net_device *dev = ptr;
786 struct macvlan_dev *vlan, *next;
787 struct macvlan_port *port;
788 LIST_HEAD(list_kill);
789
790 if (!macvlan_port_exists(dev))
791 return NOTIFY_DONE;
792
793 port = macvlan_port_get(dev);
794
795 switch (event) {
796 case NETDEV_CHANGE:
797 list_for_each_entry(vlan, &port->vlans, list)
798 netif_stacked_transfer_operstate(vlan->lowerdev,
799 vlan->dev);
800 break;
801 case NETDEV_FEAT_CHANGE:
802 list_for_each_entry(vlan, &port->vlans, list) {
803 vlan->dev->features = dev->features & MACVLAN_FEATURES;
804 vlan->dev->gso_max_size = dev->gso_max_size;
805 netdev_features_change(vlan->dev);
806 }
807 break;
808 case NETDEV_UNREGISTER:
809 /* twiddle thumbs on netns device moves */
810 if (dev->reg_state != NETREG_UNREGISTERING)
811 break;
812
813 list_for_each_entry_safe(vlan, next, &port->vlans, list)
814 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
815 unregister_netdevice_many(&list_kill);
816 list_del(&list_kill);
817 break;
818 case NETDEV_PRE_TYPE_CHANGE:
819 /* Forbid underlaying device to change its type. */
820 return NOTIFY_BAD;
821 }
822 return NOTIFY_DONE;
823 }
824
825 static struct notifier_block macvlan_notifier_block __read_mostly = {
826 .notifier_call = macvlan_device_event,
827 };
828
829 static int __init macvlan_init_module(void)
830 {
831 int err;
832
833 register_netdevice_notifier(&macvlan_notifier_block);
834
835 err = macvlan_link_register(&macvlan_link_ops);
836 if (err < 0)
837 goto err1;
838 return 0;
839 err1:
840 unregister_netdevice_notifier(&macvlan_notifier_block);
841 return err;
842 }
843
844 static void __exit macvlan_cleanup_module(void)
845 {
846 rtnl_link_unregister(&macvlan_link_ops);
847 unregister_netdevice_notifier(&macvlan_notifier_block);
848 }
849
850 module_init(macvlan_init_module);
851 module_exit(macvlan_cleanup_module);
852
853 MODULE_LICENSE("GPL");
854 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
855 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
856 MODULE_ALIAS_RTNL_LINK("macvlan");