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Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / net / macvlan.c
blob05172c39a0ceaab229c4c89411c7fabc7201ce0c
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, bool sync)
74 {
75 hlist_del_rcu(&vlan->hlist);
76 if (sync)
77 synchronize_rcu();
78 }
79
80 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
81 const unsigned char *addr)
82 {
83 macvlan_hash_del(vlan, true);
84 /* Now that we are unhashed it is safe to change the device
85 * address without confusing packet delivery.
86 */
87 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
88 macvlan_hash_add(vlan);
89 }
90
91 static int macvlan_addr_busy(const struct macvlan_port *port,
92 const unsigned char *addr)
93 {
94 /* Test to see if the specified multicast address is
95 * currently in use by the underlying device or
96 * another macvlan.
97 */
98 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
99 return 1;
100
101 if (macvlan_hash_lookup(port, addr))
102 return 1;
103
104 return 0;
105 }
106
107
108 static int macvlan_broadcast_one(struct sk_buff *skb,
109 const struct macvlan_dev *vlan,
110 const struct ethhdr *eth, bool local)
111 {
112 struct net_device *dev = vlan->dev;
113 if (!skb)
114 return NET_RX_DROP;
115
116 if (local)
117 return vlan->forward(dev, skb);
118
119 skb->dev = dev;
120 if (!compare_ether_addr_64bits(eth->h_dest,
121 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 src = macvlan_hash_lookup(port, eth->h_source);
173 if (!src)
174 /* frame comes from an external address */
175 macvlan_broadcast(skb, port, NULL,
176 MACVLAN_MODE_PRIVATE |
177 MACVLAN_MODE_VEPA |
178 MACVLAN_MODE_PASSTHRU|
179 MACVLAN_MODE_BRIDGE);
180 else if (src->mode == MACVLAN_MODE_VEPA)
181 /* flood to everyone except source */
182 macvlan_broadcast(skb, port, src->dev,
183 MACVLAN_MODE_VEPA |
184 MACVLAN_MODE_BRIDGE);
185 else if (src->mode == MACVLAN_MODE_BRIDGE)
186 /*
187 * flood only to VEPA ports, bridge ports
188 * already saw the frame on the way out.
189 */
190 macvlan_broadcast(skb, port, src->dev,
191 MACVLAN_MODE_VEPA);
192 return RX_HANDLER_PASS;
193 }
194
195 if (port->passthru)
196 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
197 else
198 vlan = macvlan_hash_lookup(port, eth->h_dest);
199 if (vlan == NULL)
200 return RX_HANDLER_PASS;
201
202 dev = vlan->dev;
203 if (unlikely(!(dev->flags & IFF_UP))) {
204 kfree_skb(skb);
205 return RX_HANDLER_CONSUMED;
206 }
207 len = skb->len + ETH_HLEN;
208 skb = skb_share_check(skb, GFP_ATOMIC);
209 if (!skb)
210 goto out;
211
212 skb->dev = dev;
213 skb->pkt_type = PACKET_HOST;
214
215 ret = vlan->receive(skb);
216
217 out:
218 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
219 return RX_HANDLER_CONSUMED;
220 }
221
222 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
223 {
224 const struct macvlan_dev *vlan = netdev_priv(dev);
225 const struct macvlan_port *port = vlan->port;
226 const struct macvlan_dev *dest;
227 __u8 ip_summed = skb->ip_summed;
228
229 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
230 const struct ethhdr *eth = (void *)skb->data;
231 skb->ip_summed = CHECKSUM_UNNECESSARY;
232
233 /* send to other bridge ports directly */
234 if (is_multicast_ether_addr(eth->h_dest)) {
235 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
236 goto xmit_world;
237 }
238
239 dest = macvlan_hash_lookup(port, eth->h_dest);
240 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
241 /* send to lowerdev first for its network taps */
242 vlan->forward(vlan->lowerdev, skb);
243
244 return NET_XMIT_SUCCESS;
245 }
246 }
247
248 xmit_world:
249 skb->ip_summed = ip_summed;
250 skb_set_dev(skb, vlan->lowerdev);
251 return dev_queue_xmit(skb);
252 }
253
254 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
255 struct net_device *dev)
256 {
257 unsigned int len = skb->len;
258 int ret;
259 const struct macvlan_dev *vlan = netdev_priv(dev);
260
261 ret = macvlan_queue_xmit(skb, dev);
262 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
263 struct macvlan_pcpu_stats *pcpu_stats;
264
265 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
266 u64_stats_update_begin(&pcpu_stats->syncp);
267 pcpu_stats->tx_packets++;
268 pcpu_stats->tx_bytes += len;
269 u64_stats_update_end(&pcpu_stats->syncp);
270 } else {
271 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
272 }
273 return ret;
274 }
275 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
276
277 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
278 unsigned short type, const void *daddr,
279 const void *saddr, unsigned len)
280 {
281 const struct macvlan_dev *vlan = netdev_priv(dev);
282 struct net_device *lowerdev = vlan->lowerdev;
283
284 return dev_hard_header(skb, lowerdev, type, daddr,
285 saddr ? : dev->dev_addr, len);
286 }
287
288 static const struct header_ops macvlan_hard_header_ops = {
289 .create = macvlan_hard_header,
290 .rebuild = eth_rebuild_header,
291 .parse = eth_header_parse,
292 .cache = eth_header_cache,
293 .cache_update = eth_header_cache_update,
294 };
295
296 static int macvlan_open(struct net_device *dev)
297 {
298 struct macvlan_dev *vlan = netdev_priv(dev);
299 struct net_device *lowerdev = vlan->lowerdev;
300 int err;
301
302 if (vlan->port->passthru) {
303 dev_set_promiscuity(lowerdev, 1);
304 goto hash_add;
305 }
306
307 err = -EBUSY;
308 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
309 goto out;
310
311 err = dev_uc_add(lowerdev, dev->dev_addr);
312 if (err < 0)
313 goto out;
314 if (dev->flags & IFF_ALLMULTI) {
315 err = dev_set_allmulti(lowerdev, 1);
316 if (err < 0)
317 goto del_unicast;
318 }
319
320 hash_add:
321 macvlan_hash_add(vlan);
322 return 0;
323
324 del_unicast:
325 dev_uc_del(lowerdev, dev->dev_addr);
326 out:
327 return err;
328 }
329
330 static int macvlan_stop(struct net_device *dev)
331 {
332 struct macvlan_dev *vlan = netdev_priv(dev);
333 struct net_device *lowerdev = vlan->lowerdev;
334
335 if (vlan->port->passthru) {
336 dev_set_promiscuity(lowerdev, -1);
337 goto hash_del;
338 }
339
340 dev_mc_unsync(lowerdev, dev);
341 if (dev->flags & IFF_ALLMULTI)
342 dev_set_allmulti(lowerdev, -1);
343
344 dev_uc_del(lowerdev, dev->dev_addr);
345
346 hash_del:
347 macvlan_hash_del(vlan, !dev->dismantle);
348 return 0;
349 }
350
351 static int macvlan_set_mac_address(struct net_device *dev, void *p)
352 {
353 struct macvlan_dev *vlan = netdev_priv(dev);
354 struct net_device *lowerdev = vlan->lowerdev;
355 struct sockaddr *addr = p;
356 int err;
357
358 if (!is_valid_ether_addr(addr->sa_data))
359 return -EADDRNOTAVAIL;
360
361 if (!(dev->flags & IFF_UP)) {
362 /* Just copy in the new address */
363 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
364 } else {
365 /* Rehash and update the device filters */
366 if (macvlan_addr_busy(vlan->port, addr->sa_data))
367 return -EBUSY;
368
369 err = dev_uc_add(lowerdev, addr->sa_data);
370 if (err)
371 return err;
372
373 dev_uc_del(lowerdev, dev->dev_addr);
374
375 macvlan_hash_change_addr(vlan, addr->sa_data);
376 }
377 return 0;
378 }
379
380 static void macvlan_change_rx_flags(struct net_device *dev, int change)
381 {
382 struct macvlan_dev *vlan = netdev_priv(dev);
383 struct net_device *lowerdev = vlan->lowerdev;
384
385 if (change & IFF_ALLMULTI)
386 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
387 }
388
389 static void macvlan_set_multicast_list(struct net_device *dev)
390 {
391 struct macvlan_dev *vlan = netdev_priv(dev);
392
393 dev_mc_sync(vlan->lowerdev, dev);
394 }
395
396 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
397 {
398 struct macvlan_dev *vlan = netdev_priv(dev);
399
400 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
401 return -EINVAL;
402 dev->mtu = new_mtu;
403 return 0;
404 }
405
406 /*
407 * macvlan network devices have devices nesting below it and are a special
408 * "super class" of normal network devices; split their locks off into a
409 * separate class since they always nest.
410 */
411 static struct lock_class_key macvlan_netdev_xmit_lock_key;
412 static struct lock_class_key macvlan_netdev_addr_lock_key;
413
414 #define MACVLAN_FEATURES \
415 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
416 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
417 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
418 NETIF_F_HW_VLAN_FILTER)
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_vlan_rx_add_vid(struct net_device *dev,
514 unsigned short vid)
515 {
516 struct macvlan_dev *vlan = netdev_priv(dev);
517 struct net_device *lowerdev = vlan->lowerdev;
518 const struct net_device_ops *ops = lowerdev->netdev_ops;
519
520 if (ops->ndo_vlan_rx_add_vid)
521 ops->ndo_vlan_rx_add_vid(lowerdev, vid);
522 }
523
524 static void macvlan_vlan_rx_kill_vid(struct net_device *dev,
525 unsigned short vid)
526 {
527 struct macvlan_dev *vlan = netdev_priv(dev);
528 struct net_device *lowerdev = vlan->lowerdev;
529 const struct net_device_ops *ops = lowerdev->netdev_ops;
530
531 if (ops->ndo_vlan_rx_kill_vid)
532 ops->ndo_vlan_rx_kill_vid(lowerdev, vid);
533 }
534
535 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
536 struct ethtool_drvinfo *drvinfo)
537 {
538 snprintf(drvinfo->driver, 32, "macvlan");
539 snprintf(drvinfo->version, 32, "0.1");
540 }
541
542 static int macvlan_ethtool_get_settings(struct net_device *dev,
543 struct ethtool_cmd *cmd)
544 {
545 const struct macvlan_dev *vlan = netdev_priv(dev);
546 return dev_ethtool_get_settings(vlan->lowerdev, cmd);
547 }
548
549 static const struct ethtool_ops macvlan_ethtool_ops = {
550 .get_link = ethtool_op_get_link,
551 .get_settings = macvlan_ethtool_get_settings,
552 .get_drvinfo = macvlan_ethtool_get_drvinfo,
553 };
554
555 static const struct net_device_ops macvlan_netdev_ops = {
556 .ndo_init = macvlan_init,
557 .ndo_uninit = macvlan_uninit,
558 .ndo_open = macvlan_open,
559 .ndo_stop = macvlan_stop,
560 .ndo_start_xmit = macvlan_start_xmit,
561 .ndo_change_mtu = macvlan_change_mtu,
562 .ndo_change_rx_flags = macvlan_change_rx_flags,
563 .ndo_set_mac_address = macvlan_set_mac_address,
564 .ndo_set_multicast_list = macvlan_set_multicast_list,
565 .ndo_get_stats64 = macvlan_dev_get_stats64,
566 .ndo_validate_addr = eth_validate_addr,
567 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
568 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
569 };
570
571 void macvlan_common_setup(struct net_device *dev)
572 {
573 ether_setup(dev);
574
575 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
576 dev->netdev_ops = &macvlan_netdev_ops;
577 dev->destructor = free_netdev;
578 dev->header_ops = &macvlan_hard_header_ops,
579 dev->ethtool_ops = &macvlan_ethtool_ops;
580 }
581 EXPORT_SYMBOL_GPL(macvlan_common_setup);
582
583 static void macvlan_setup(struct net_device *dev)
584 {
585 macvlan_common_setup(dev);
586 dev->tx_queue_len = 0;
587 }
588
589 static int macvlan_port_create(struct net_device *dev)
590 {
591 struct macvlan_port *port;
592 unsigned int i;
593 int err;
594
595 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
596 return -EINVAL;
597
598 port = kzalloc(sizeof(*port), GFP_KERNEL);
599 if (port == NULL)
600 return -ENOMEM;
601
602 port->passthru = false;
603 port->dev = dev;
604 INIT_LIST_HEAD(&port->vlans);
605 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
606 INIT_HLIST_HEAD(&port->vlan_hash[i]);
607
608 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
609 if (err)
610 kfree(port);
611 else
612 dev->priv_flags |= IFF_MACVLAN_PORT;
613 return err;
614 }
615
616 static void macvlan_port_destroy(struct net_device *dev)
617 {
618 struct macvlan_port *port = macvlan_port_get(dev);
619
620 dev->priv_flags &= ~IFF_MACVLAN_PORT;
621 netdev_rx_handler_unregister(dev);
622 kfree_rcu(port, rcu);
623 }
624
625 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
626 {
627 if (tb[IFLA_ADDRESS]) {
628 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
629 return -EINVAL;
630 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
631 return -EADDRNOTAVAIL;
632 }
633
634 if (data && data[IFLA_MACVLAN_MODE]) {
635 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
636 case MACVLAN_MODE_PRIVATE:
637 case MACVLAN_MODE_VEPA:
638 case MACVLAN_MODE_BRIDGE:
639 case MACVLAN_MODE_PASSTHRU:
640 break;
641 default:
642 return -EINVAL;
643 }
644 }
645 return 0;
646 }
647
648 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
649 struct nlattr *tb[], struct nlattr *data[],
650 int (*receive)(struct sk_buff *skb),
651 int (*forward)(struct net_device *dev,
652 struct sk_buff *skb))
653 {
654 struct macvlan_dev *vlan = netdev_priv(dev);
655 struct macvlan_port *port;
656 struct net_device *lowerdev;
657 int err;
658
659 if (!tb[IFLA_LINK])
660 return -EINVAL;
661
662 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
663 if (lowerdev == NULL)
664 return -ENODEV;
665
666 /* When creating macvlans on top of other macvlans - use
667 * the real device as the lowerdev.
668 */
669 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
670 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
671 lowerdev = lowervlan->lowerdev;
672 }
673
674 if (!tb[IFLA_MTU])
675 dev->mtu = lowerdev->mtu;
676 else if (dev->mtu > lowerdev->mtu)
677 return -EINVAL;
678
679 if (!tb[IFLA_ADDRESS])
680 random_ether_addr(dev->dev_addr);
681
682 if (!macvlan_port_exists(lowerdev)) {
683 err = macvlan_port_create(lowerdev);
684 if (err < 0)
685 return err;
686 }
687 port = macvlan_port_get(lowerdev);
688
689 /* Only 1 macvlan device can be created in passthru mode */
690 if (port->passthru)
691 return -EINVAL;
692
693 vlan->lowerdev = lowerdev;
694 vlan->dev = dev;
695 vlan->port = port;
696 vlan->receive = receive;
697 vlan->forward = forward;
698
699 vlan->mode = MACVLAN_MODE_VEPA;
700 if (data && data[IFLA_MACVLAN_MODE])
701 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
702
703 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
704 if (port->count)
705 return -EINVAL;
706 port->passthru = true;
707 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
708 }
709
710 port->count += 1;
711 err = register_netdevice(dev);
712 if (err < 0)
713 goto destroy_port;
714
715 list_add_tail(&vlan->list, &port->vlans);
716 netif_stacked_transfer_operstate(lowerdev, dev);
717
718 return 0;
719
720 destroy_port:
721 port->count -= 1;
722 if (!port->count)
723 macvlan_port_destroy(lowerdev);
724
725 return err;
726 }
727 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
728
729 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
730 struct nlattr *tb[], struct nlattr *data[])
731 {
732 return macvlan_common_newlink(src_net, dev, tb, data,
733 netif_rx,
734 dev_forward_skb);
735 }
736
737 void macvlan_dellink(struct net_device *dev, struct list_head *head)
738 {
739 struct macvlan_dev *vlan = netdev_priv(dev);
740
741 list_del(&vlan->list);
742 unregister_netdevice_queue(dev, head);
743 }
744 EXPORT_SYMBOL_GPL(macvlan_dellink);
745
746 static int macvlan_changelink(struct net_device *dev,
747 struct nlattr *tb[], struct nlattr *data[])
748 {
749 struct macvlan_dev *vlan = netdev_priv(dev);
750 if (data && data[IFLA_MACVLAN_MODE])
751 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
752 return 0;
753 }
754
755 static size_t macvlan_get_size(const struct net_device *dev)
756 {
757 return nla_total_size(4);
758 }
759
760 static int macvlan_fill_info(struct sk_buff *skb,
761 const struct net_device *dev)
762 {
763 struct macvlan_dev *vlan = netdev_priv(dev);
764
765 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
766 return 0;
767
768 nla_put_failure:
769 return -EMSGSIZE;
770 }
771
772 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
773 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
774 };
775
776 int macvlan_link_register(struct rtnl_link_ops *ops)
777 {
778 /* common fields */
779 ops->priv_size = sizeof(struct macvlan_dev);
780 ops->validate = macvlan_validate;
781 ops->maxtype = IFLA_MACVLAN_MAX;
782 ops->policy = macvlan_policy;
783 ops->changelink = macvlan_changelink;
784 ops->get_size = macvlan_get_size;
785 ops->fill_info = macvlan_fill_info;
786
787 return rtnl_link_register(ops);
788 };
789 EXPORT_SYMBOL_GPL(macvlan_link_register);
790
791 static struct rtnl_link_ops macvlan_link_ops = {
792 .kind = "macvlan",
793 .setup = macvlan_setup,
794 .newlink = macvlan_newlink,
795 .dellink = macvlan_dellink,
796 };
797
798 static int macvlan_device_event(struct notifier_block *unused,
799 unsigned long event, void *ptr)
800 {
801 struct net_device *dev = ptr;
802 struct macvlan_dev *vlan, *next;
803 struct macvlan_port *port;
804 LIST_HEAD(list_kill);
805
806 if (!macvlan_port_exists(dev))
807 return NOTIFY_DONE;
808
809 port = macvlan_port_get(dev);
810
811 switch (event) {
812 case NETDEV_CHANGE:
813 list_for_each_entry(vlan, &port->vlans, list)
814 netif_stacked_transfer_operstate(vlan->lowerdev,
815 vlan->dev);
816 break;
817 case NETDEV_FEAT_CHANGE:
818 list_for_each_entry(vlan, &port->vlans, list) {
819 vlan->dev->features = dev->features & MACVLAN_FEATURES;
820 vlan->dev->gso_max_size = dev->gso_max_size;
821 netdev_features_change(vlan->dev);
822 }
823 break;
824 case NETDEV_UNREGISTER:
825 /* twiddle thumbs on netns device moves */
826 if (dev->reg_state != NETREG_UNREGISTERING)
827 break;
828
829 list_for_each_entry_safe(vlan, next, &port->vlans, list)
830 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
831 unregister_netdevice_many(&list_kill);
832 list_del(&list_kill);
833 break;
834 case NETDEV_PRE_TYPE_CHANGE:
835 /* Forbid underlaying device to change its type. */
836 return NOTIFY_BAD;
837 }
838 return NOTIFY_DONE;
839 }
840
841 static struct notifier_block macvlan_notifier_block __read_mostly = {
842 .notifier_call = macvlan_device_event,
843 };
844
845 static int __init macvlan_init_module(void)
846 {
847 int err;
848
849 register_netdevice_notifier(&macvlan_notifier_block);
850
851 err = macvlan_link_register(&macvlan_link_ops);
852 if (err < 0)
853 goto err1;
854 return 0;
855 err1:
856 unregister_netdevice_notifier(&macvlan_notifier_block);
857 return err;
858 }
859
860 static void __exit macvlan_cleanup_module(void)
861 {
862 rtnl_link_unregister(&macvlan_link_ops);
863 unregister_netdevice_notifier(&macvlan_notifier_block);
864 }
865
866 module_init(macvlan_init_module);
867 module_exit(macvlan_cleanup_module);
868
869 MODULE_LICENSE("GPL");
870 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
871 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
872 MODULE_ALIAS_RTNL_LINK("macvlan");
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