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proc: use seq_puts()/seq_putc() where possible
[linux-2.6/next.git] / drivers / net / macvlan.c
blob6ed577b065df136a18af5ee483810773ca4f43f8
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 };
43
44 #define macvlan_port_get_rcu(dev) \
45 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
46 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
47 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
48
49 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
50 const unsigned char *addr)
51 {
52 struct macvlan_dev *vlan;
53 struct hlist_node *n;
54
55 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
56 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
57 return vlan;
58 }
59 return NULL;
60 }
61
62 static void macvlan_hash_add(struct macvlan_dev *vlan)
63 {
64 struct macvlan_port *port = vlan->port;
65 const unsigned char *addr = vlan->dev->dev_addr;
66
67 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
68 }
69
70 static void macvlan_hash_del(struct macvlan_dev *vlan)
71 {
72 hlist_del_rcu(&vlan->hlist);
73 synchronize_rcu();
74 }
75
76 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
77 const unsigned char *addr)
78 {
79 macvlan_hash_del(vlan);
80 /* Now that we are unhashed it is safe to change the device
81 * address without confusing packet delivery.
82 */
83 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
84 macvlan_hash_add(vlan);
85 }
86
87 static int macvlan_addr_busy(const struct macvlan_port *port,
88 const unsigned char *addr)
89 {
90 /* Test to see if the specified multicast address is
91 * currently in use by the underlying device or
92 * another macvlan.
93 */
94 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
95 return 1;
96
97 if (macvlan_hash_lookup(port, addr))
98 return 1;
99
100 return 0;
101 }
102
103
104 static int macvlan_broadcast_one(struct sk_buff *skb,
105 const struct macvlan_dev *vlan,
106 const struct ethhdr *eth, bool local)
107 {
108 struct net_device *dev = vlan->dev;
109 if (!skb)
110 return NET_RX_DROP;
111
112 if (local)
113 return vlan->forward(dev, skb);
114
115 skb->dev = dev;
116 if (!compare_ether_addr_64bits(eth->h_dest,
117 dev->broadcast))
118 skb->pkt_type = PACKET_BROADCAST;
119 else
120 skb->pkt_type = PACKET_MULTICAST;
121
122 return vlan->receive(skb);
123 }
124
125 static void macvlan_broadcast(struct sk_buff *skb,
126 const struct macvlan_port *port,
127 struct net_device *src,
128 enum macvlan_mode mode)
129 {
130 const struct ethhdr *eth = eth_hdr(skb);
131 const struct macvlan_dev *vlan;
132 struct hlist_node *n;
133 struct sk_buff *nskb;
134 unsigned int i;
135 int err;
136
137 if (skb->protocol == htons(ETH_P_PAUSE))
138 return;
139
140 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
141 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
142 if (vlan->dev == src || !(vlan->mode & mode))
143 continue;
144
145 nskb = skb_clone(skb, GFP_ATOMIC);
146 err = macvlan_broadcast_one(nskb, vlan, eth,
147 mode == MACVLAN_MODE_BRIDGE);
148 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
149 err == NET_RX_SUCCESS, 1);
150 }
151 }
152 }
153
154 /* called under rcu_read_lock() from netif_receive_skb */
155 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
156 {
157 struct macvlan_port *port;
158 const struct ethhdr *eth = eth_hdr(skb);
159 const struct macvlan_dev *vlan;
160 const struct macvlan_dev *src;
161 struct net_device *dev;
162 unsigned int len = 0;
163 int ret = NET_RX_DROP;
164
165 port = macvlan_port_get_rcu(skb->dev);
166 if (is_multicast_ether_addr(eth->h_dest)) {
167 src = macvlan_hash_lookup(port, eth->h_source);
168 if (!src)
169 /* frame comes from an external address */
170 macvlan_broadcast(skb, port, NULL,
171 MACVLAN_MODE_PRIVATE |
172 MACVLAN_MODE_VEPA |
173 MACVLAN_MODE_PASSTHRU|
174 MACVLAN_MODE_BRIDGE);
175 else if (src->mode == MACVLAN_MODE_VEPA)
176 /* flood to everyone except source */
177 macvlan_broadcast(skb, port, src->dev,
178 MACVLAN_MODE_VEPA |
179 MACVLAN_MODE_BRIDGE);
180 else if (src->mode == MACVLAN_MODE_BRIDGE)
181 /*
182 * flood only to VEPA ports, bridge ports
183 * already saw the frame on the way out.
184 */
185 macvlan_broadcast(skb, port, src->dev,
186 MACVLAN_MODE_VEPA);
187 return skb;
188 }
189
190 if (port->passthru)
191 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
192 else
193 vlan = macvlan_hash_lookup(port, eth->h_dest);
194 if (vlan == NULL)
195 return skb;
196
197 dev = vlan->dev;
198 if (unlikely(!(dev->flags & IFF_UP))) {
199 kfree_skb(skb);
200 return NULL;
201 }
202 len = skb->len + ETH_HLEN;
203 skb = skb_share_check(skb, GFP_ATOMIC);
204 if (!skb)
205 goto out;
206
207 skb->dev = dev;
208 skb->pkt_type = PACKET_HOST;
209
210 ret = vlan->receive(skb);
211
212 out:
213 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
214 return NULL;
215 }
216
217 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
218 {
219 const struct macvlan_dev *vlan = netdev_priv(dev);
220 const struct macvlan_port *port = vlan->port;
221 const struct macvlan_dev *dest;
222
223 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
224 const struct ethhdr *eth = (void *)skb->data;
225
226 /* send to other bridge ports directly */
227 if (is_multicast_ether_addr(eth->h_dest)) {
228 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
229 goto xmit_world;
230 }
231
232 dest = macvlan_hash_lookup(port, eth->h_dest);
233 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
234 unsigned int length = skb->len + ETH_HLEN;
235 int ret = dest->forward(dest->dev, skb);
236 macvlan_count_rx(dest, length,
237 ret == NET_RX_SUCCESS, 0);
238
239 return NET_XMIT_SUCCESS;
240 }
241 }
242
243 xmit_world:
244 skb_set_dev(skb, vlan->lowerdev);
245 return dev_queue_xmit(skb);
246 }
247
248 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
249 struct net_device *dev)
250 {
251 unsigned int len = skb->len;
252 int ret;
253 const struct macvlan_dev *vlan = netdev_priv(dev);
254
255 ret = macvlan_queue_xmit(skb, dev);
256 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
257 struct macvlan_pcpu_stats *pcpu_stats;
258
259 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
260 u64_stats_update_begin(&pcpu_stats->syncp);
261 pcpu_stats->tx_packets++;
262 pcpu_stats->tx_bytes += len;
263 u64_stats_update_end(&pcpu_stats->syncp);
264 } else {
265 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
266 }
267 return ret;
268 }
269 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
270
271 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
272 unsigned short type, const void *daddr,
273 const void *saddr, unsigned len)
274 {
275 const struct macvlan_dev *vlan = netdev_priv(dev);
276 struct net_device *lowerdev = vlan->lowerdev;
277
278 return dev_hard_header(skb, lowerdev, type, daddr,
279 saddr ? : dev->dev_addr, len);
280 }
281
282 static const struct header_ops macvlan_hard_header_ops = {
283 .create = macvlan_hard_header,
284 .rebuild = eth_rebuild_header,
285 .parse = eth_header_parse,
286 .cache = eth_header_cache,
287 .cache_update = eth_header_cache_update,
288 };
289
290 static int macvlan_open(struct net_device *dev)
291 {
292 struct macvlan_dev *vlan = netdev_priv(dev);
293 struct net_device *lowerdev = vlan->lowerdev;
294 int err;
295
296 if (vlan->port->passthru) {
297 dev_set_promiscuity(lowerdev, 1);
298 goto hash_add;
299 }
300
301 err = -EBUSY;
302 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
303 goto out;
304
305 err = dev_uc_add(lowerdev, dev->dev_addr);
306 if (err < 0)
307 goto out;
308 if (dev->flags & IFF_ALLMULTI) {
309 err = dev_set_allmulti(lowerdev, 1);
310 if (err < 0)
311 goto del_unicast;
312 }
313
314 hash_add:
315 macvlan_hash_add(vlan);
316 return 0;
317
318 del_unicast:
319 dev_uc_del(lowerdev, dev->dev_addr);
320 out:
321 return err;
322 }
323
324 static int macvlan_stop(struct net_device *dev)
325 {
326 struct macvlan_dev *vlan = netdev_priv(dev);
327 struct net_device *lowerdev = vlan->lowerdev;
328
329 if (vlan->port->passthru) {
330 dev_set_promiscuity(lowerdev, -1);
331 goto hash_del;
332 }
333
334 dev_mc_unsync(lowerdev, dev);
335 if (dev->flags & IFF_ALLMULTI)
336 dev_set_allmulti(lowerdev, -1);
337
338 dev_uc_del(lowerdev, dev->dev_addr);
339
340 hash_del:
341 macvlan_hash_del(vlan);
342 return 0;
343 }
344
345 static int macvlan_set_mac_address(struct net_device *dev, void *p)
346 {
347 struct macvlan_dev *vlan = netdev_priv(dev);
348 struct net_device *lowerdev = vlan->lowerdev;
349 struct sockaddr *addr = p;
350 int err;
351
352 if (!is_valid_ether_addr(addr->sa_data))
353 return -EADDRNOTAVAIL;
354
355 if (!(dev->flags & IFF_UP)) {
356 /* Just copy in the new address */
357 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
358 } else {
359 /* Rehash and update the device filters */
360 if (macvlan_addr_busy(vlan->port, addr->sa_data))
361 return -EBUSY;
362
363 err = dev_uc_add(lowerdev, addr->sa_data);
364 if (err)
365 return err;
366
367 dev_uc_del(lowerdev, dev->dev_addr);
368
369 macvlan_hash_change_addr(vlan, addr->sa_data);
370 }
371 return 0;
372 }
373
374 static void macvlan_change_rx_flags(struct net_device *dev, int change)
375 {
376 struct macvlan_dev *vlan = netdev_priv(dev);
377 struct net_device *lowerdev = vlan->lowerdev;
378
379 if (change & IFF_ALLMULTI)
380 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
381 }
382
383 static void macvlan_set_multicast_list(struct net_device *dev)
384 {
385 struct macvlan_dev *vlan = netdev_priv(dev);
386
387 dev_mc_sync(vlan->lowerdev, dev);
388 }
389
390 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
391 {
392 struct macvlan_dev *vlan = netdev_priv(dev);
393
394 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
395 return -EINVAL;
396 dev->mtu = new_mtu;
397 return 0;
398 }
399
400 /*
401 * macvlan network devices have devices nesting below it and are a special
402 * "super class" of normal network devices; split their locks off into a
403 * separate class since they always nest.
404 */
405 static struct lock_class_key macvlan_netdev_xmit_lock_key;
406 static struct lock_class_key macvlan_netdev_addr_lock_key;
407
408 #define MACVLAN_FEATURES \
409 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
410 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
411 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO)
412
413 #define MACVLAN_STATE_MASK \
414 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
415
416 static void macvlan_set_lockdep_class_one(struct net_device *dev,
417 struct netdev_queue *txq,
418 void *_unused)
419 {
420 lockdep_set_class(&txq->_xmit_lock,
421 &macvlan_netdev_xmit_lock_key);
422 }
423
424 static void macvlan_set_lockdep_class(struct net_device *dev)
425 {
426 lockdep_set_class(&dev->addr_list_lock,
427 &macvlan_netdev_addr_lock_key);
428 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
429 }
430
431 static int macvlan_init(struct net_device *dev)
432 {
433 struct macvlan_dev *vlan = netdev_priv(dev);
434 const struct net_device *lowerdev = vlan->lowerdev;
435
436 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
437 (lowerdev->state & MACVLAN_STATE_MASK);
438 dev->features = lowerdev->features & MACVLAN_FEATURES;
439 dev->features |= NETIF_F_LLTX;
440 dev->gso_max_size = lowerdev->gso_max_size;
441 dev->iflink = lowerdev->ifindex;
442 dev->hard_header_len = lowerdev->hard_header_len;
443
444 macvlan_set_lockdep_class(dev);
445
446 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
447 if (!vlan->pcpu_stats)
448 return -ENOMEM;
449
450 return 0;
451 }
452
453 static void macvlan_uninit(struct net_device *dev)
454 {
455 struct macvlan_dev *vlan = netdev_priv(dev);
456
457 free_percpu(vlan->pcpu_stats);
458 }
459
460 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
461 struct rtnl_link_stats64 *stats)
462 {
463 struct macvlan_dev *vlan = netdev_priv(dev);
464
465 if (vlan->pcpu_stats) {
466 struct macvlan_pcpu_stats *p;
467 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
468 u32 rx_errors = 0, tx_dropped = 0;
469 unsigned int start;
470 int i;
471
472 for_each_possible_cpu(i) {
473 p = per_cpu_ptr(vlan->pcpu_stats, i);
474 do {
475 start = u64_stats_fetch_begin_bh(&p->syncp);
476 rx_packets = p->rx_packets;
477 rx_bytes = p->rx_bytes;
478 rx_multicast = p->rx_multicast;
479 tx_packets = p->tx_packets;
480 tx_bytes = p->tx_bytes;
481 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
482
483 stats->rx_packets += rx_packets;
484 stats->rx_bytes += rx_bytes;
485 stats->multicast += rx_multicast;
486 stats->tx_packets += tx_packets;
487 stats->tx_bytes += tx_bytes;
488 /* rx_errors & tx_dropped are u32, updated
489 * without syncp protection.
490 */
491 rx_errors += p->rx_errors;
492 tx_dropped += p->tx_dropped;
493 }
494 stats->rx_errors = rx_errors;
495 stats->rx_dropped = rx_errors;
496 stats->tx_dropped = tx_dropped;
497 }
498 return stats;
499 }
500
501 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
502 struct ethtool_drvinfo *drvinfo)
503 {
504 snprintf(drvinfo->driver, 32, "macvlan");
505 snprintf(drvinfo->version, 32, "0.1");
506 }
507
508 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
509 {
510 const struct macvlan_dev *vlan = netdev_priv(dev);
511 return dev_ethtool_get_rx_csum(vlan->lowerdev);
512 }
513
514 static int macvlan_ethtool_get_settings(struct net_device *dev,
515 struct ethtool_cmd *cmd)
516 {
517 const struct macvlan_dev *vlan = netdev_priv(dev);
518 return dev_ethtool_get_settings(vlan->lowerdev, cmd);
519 }
520
521 static u32 macvlan_ethtool_get_flags(struct net_device *dev)
522 {
523 const struct macvlan_dev *vlan = netdev_priv(dev);
524 return dev_ethtool_get_flags(vlan->lowerdev);
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_rx_csum = macvlan_ethtool_get_rx_csum,
531 .get_drvinfo = macvlan_ethtool_get_drvinfo,
532 .get_flags = macvlan_ethtool_get_flags,
533 };
534
535 static const struct net_device_ops macvlan_netdev_ops = {
536 .ndo_init = macvlan_init,
537 .ndo_uninit = macvlan_uninit,
538 .ndo_open = macvlan_open,
539 .ndo_stop = macvlan_stop,
540 .ndo_start_xmit = macvlan_start_xmit,
541 .ndo_change_mtu = macvlan_change_mtu,
542 .ndo_change_rx_flags = macvlan_change_rx_flags,
543 .ndo_set_mac_address = macvlan_set_mac_address,
544 .ndo_set_multicast_list = macvlan_set_multicast_list,
545 .ndo_get_stats64 = macvlan_dev_get_stats64,
546 .ndo_validate_addr = eth_validate_addr,
547 };
548
549 void macvlan_common_setup(struct net_device *dev)
550 {
551 ether_setup(dev);
552
553 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
554 dev->netdev_ops = &macvlan_netdev_ops;
555 dev->destructor = free_netdev;
556 dev->header_ops = &macvlan_hard_header_ops,
557 dev->ethtool_ops = &macvlan_ethtool_ops;
558 }
559 EXPORT_SYMBOL_GPL(macvlan_common_setup);
560
561 static void macvlan_setup(struct net_device *dev)
562 {
563 macvlan_common_setup(dev);
564 dev->tx_queue_len = 0;
565 }
566
567 static int macvlan_port_create(struct net_device *dev)
568 {
569 struct macvlan_port *port;
570 unsigned int i;
571 int err;
572
573 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
574 return -EINVAL;
575
576 port = kzalloc(sizeof(*port), GFP_KERNEL);
577 if (port == NULL)
578 return -ENOMEM;
579
580 port->passthru = false;
581 port->dev = dev;
582 INIT_LIST_HEAD(&port->vlans);
583 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
584 INIT_HLIST_HEAD(&port->vlan_hash[i]);
585
586 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
587 if (err)
588 kfree(port);
589
590 dev->priv_flags |= IFF_MACVLAN_PORT;
591 return err;
592 }
593
594 static void macvlan_port_rcu_free(struct rcu_head *head)
595 {
596 struct macvlan_port *port;
597
598 port = container_of(head, struct macvlan_port, rcu);
599 kfree(port);
600 }
601
602 static void macvlan_port_destroy(struct net_device *dev)
603 {
604 struct macvlan_port *port = macvlan_port_get(dev);
605
606 dev->priv_flags &= ~IFF_MACVLAN_PORT;
607 netdev_rx_handler_unregister(dev);
608 call_rcu(&port->rcu, macvlan_port_rcu_free);
609 }
610
611 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
612 {
613 if (tb[IFLA_ADDRESS]) {
614 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
615 return -EINVAL;
616 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
617 return -EADDRNOTAVAIL;
618 }
619
620 if (data && data[IFLA_MACVLAN_MODE]) {
621 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
622 case MACVLAN_MODE_PRIVATE:
623 case MACVLAN_MODE_VEPA:
624 case MACVLAN_MODE_BRIDGE:
625 case MACVLAN_MODE_PASSTHRU:
626 break;
627 default:
628 return -EINVAL;
629 }
630 }
631 return 0;
632 }
633
634 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
635 struct nlattr *tb[], struct nlattr *data[],
636 int (*receive)(struct sk_buff *skb),
637 int (*forward)(struct net_device *dev,
638 struct sk_buff *skb))
639 {
640 struct macvlan_dev *vlan = netdev_priv(dev);
641 struct macvlan_port *port;
642 struct net_device *lowerdev;
643 int err;
644
645 if (!tb[IFLA_LINK])
646 return -EINVAL;
647
648 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
649 if (lowerdev == NULL)
650 return -ENODEV;
651
652 /* When creating macvlans on top of other macvlans - use
653 * the real device as the lowerdev.
654 */
655 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
656 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
657 lowerdev = lowervlan->lowerdev;
658 }
659
660 if (!tb[IFLA_MTU])
661 dev->mtu = lowerdev->mtu;
662 else if (dev->mtu > lowerdev->mtu)
663 return -EINVAL;
664
665 if (!tb[IFLA_ADDRESS])
666 random_ether_addr(dev->dev_addr);
667
668 if (!macvlan_port_exists(lowerdev)) {
669 err = macvlan_port_create(lowerdev);
670 if (err < 0)
671 return err;
672 }
673 port = macvlan_port_get(lowerdev);
674
675 /* Only 1 macvlan device can be created in passthru mode */
676 if (port->passthru)
677 return -EINVAL;
678
679 vlan->lowerdev = lowerdev;
680 vlan->dev = dev;
681 vlan->port = port;
682 vlan->receive = receive;
683 vlan->forward = forward;
684
685 vlan->mode = MACVLAN_MODE_VEPA;
686 if (data && data[IFLA_MACVLAN_MODE])
687 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
688
689 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
690 if (!list_empty(&port->vlans))
691 return -EINVAL;
692 port->passthru = true;
693 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
694 }
695
696 err = register_netdevice(dev);
697 if (err < 0)
698 goto destroy_port;
699
700 list_add_tail(&vlan->list, &port->vlans);
701 netif_stacked_transfer_operstate(lowerdev, dev);
702
703 return 0;
704
705 destroy_port:
706 if (list_empty(&port->vlans))
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 struct macvlan_port *port = vlan->port;
725
726 list_del(&vlan->list);
727 unregister_netdevice_queue(dev, head);
728
729 if (list_empty(&port->vlans))
730 macvlan_port_destroy(port->dev);
731 }
732 EXPORT_SYMBOL_GPL(macvlan_dellink);
733
734 static int macvlan_changelink(struct net_device *dev,
735 struct nlattr *tb[], struct nlattr *data[])
736 {
737 struct macvlan_dev *vlan = netdev_priv(dev);
738 if (data && data[IFLA_MACVLAN_MODE])
739 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
740 return 0;
741 }
742
743 static size_t macvlan_get_size(const struct net_device *dev)
744 {
745 return nla_total_size(4);
746 }
747
748 static int macvlan_fill_info(struct sk_buff *skb,
749 const struct net_device *dev)
750 {
751 struct macvlan_dev *vlan = netdev_priv(dev);
752
753 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
754 return 0;
755
756 nla_put_failure:
757 return -EMSGSIZE;
758 }
759
760 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
761 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
762 };
763
764 int macvlan_link_register(struct rtnl_link_ops *ops)
765 {
766 /* common fields */
767 ops->priv_size = sizeof(struct macvlan_dev);
768 ops->validate = macvlan_validate;
769 ops->maxtype = IFLA_MACVLAN_MAX;
770 ops->policy = macvlan_policy;
771 ops->changelink = macvlan_changelink;
772 ops->get_size = macvlan_get_size;
773 ops->fill_info = macvlan_fill_info;
774
775 return rtnl_link_register(ops);
776 };
777 EXPORT_SYMBOL_GPL(macvlan_link_register);
778
779 static struct rtnl_link_ops macvlan_link_ops = {
780 .kind = "macvlan",
781 .setup = macvlan_setup,
782 .newlink = macvlan_newlink,
783 .dellink = macvlan_dellink,
784 };
785
786 static int macvlan_device_event(struct notifier_block *unused,
787 unsigned long event, void *ptr)
788 {
789 struct net_device *dev = ptr;
790 struct macvlan_dev *vlan, *next;
791 struct macvlan_port *port;
792
793 if (!macvlan_port_exists(dev))
794 return NOTIFY_DONE;
795
796 port = macvlan_port_get(dev);
797
798 switch (event) {
799 case NETDEV_CHANGE:
800 list_for_each_entry(vlan, &port->vlans, list)
801 netif_stacked_transfer_operstate(vlan->lowerdev,
802 vlan->dev);
803 break;
804 case NETDEV_FEAT_CHANGE:
805 list_for_each_entry(vlan, &port->vlans, list) {
806 vlan->dev->features = dev->features & MACVLAN_FEATURES;
807 vlan->dev->gso_max_size = dev->gso_max_size;
808 netdev_features_change(vlan->dev);
809 }
810 break;
811 case NETDEV_UNREGISTER:
812 /* twiddle thumbs on netns device moves */
813 if (dev->reg_state != NETREG_UNREGISTERING)
814 break;
815
816 list_for_each_entry_safe(vlan, next, &port->vlans, list)
817 vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
818 break;
819 case NETDEV_PRE_TYPE_CHANGE:
820 /* Forbid underlaying device to change its type. */
821 return NOTIFY_BAD;
822 }
823 return NOTIFY_DONE;
824 }
825
826 static struct notifier_block macvlan_notifier_block __read_mostly = {
827 .notifier_call = macvlan_device_event,
828 };
829
830 static int __init macvlan_init_module(void)
831 {
832 int err;
833
834 register_netdevice_notifier(&macvlan_notifier_block);
835
836 err = macvlan_link_register(&macvlan_link_ops);
837 if (err < 0)
838 goto err1;
839 return 0;
840 err1:
841 unregister_netdevice_notifier(&macvlan_notifier_block);
842 return err;
843 }
844
845 static void __exit macvlan_cleanup_module(void)
846 {
847 rtnl_link_unregister(&macvlan_link_ops);
848 unregister_netdevice_notifier(&macvlan_notifier_block);
849 }
850
851 module_init(macvlan_init_module);
852 module_exit(macvlan_cleanup_module);
853
854 MODULE_LICENSE("GPL");
855 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
856 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
857 MODULE_ALIAS_RTNL_LINK("macvlan");
linux-next