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Linux 3.4.71
[linux/fpc-iii.git] / drivers / net / macvlan.c
blob71605231bcb22590a06727fb4bfbaac0470443e4
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_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 (!compare_ether_addr_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 (!compare_ether_addr_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 (!compare_ether_addr_64bits(eth->h_dest,
122 dev->broadcast))
123 skb->pkt_type = PACKET_BROADCAST;
124 else
125 skb->pkt_type = PACKET_MULTICAST;
126
127 return vlan->receive(skb);
128 }
129
130 static void macvlan_broadcast(struct sk_buff *skb,
131 const struct macvlan_port *port,
132 struct net_device *src,
133 enum macvlan_mode mode)
134 {
135 const struct ethhdr *eth = eth_hdr(skb);
136 const struct macvlan_dev *vlan;
137 struct hlist_node *n;
138 struct sk_buff *nskb;
139 unsigned int i;
140 int err;
141
142 if (skb->protocol == htons(ETH_P_PAUSE))
143 return;
144
145 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
146 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
147 if (vlan->dev == src || !(vlan->mode & mode))
148 continue;
149
150 nskb = skb_clone(skb, GFP_ATOMIC);
151 err = macvlan_broadcast_one(nskb, vlan, eth,
152 mode == MACVLAN_MODE_BRIDGE);
153 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
154 err == NET_RX_SUCCESS, 1);
155 }
156 }
157 }
158
159 /* called under rcu_read_lock() from netif_receive_skb */
160 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
161 {
162 struct macvlan_port *port;
163 struct sk_buff *skb = *pskb;
164 const struct ethhdr *eth = eth_hdr(skb);
165 const struct macvlan_dev *vlan;
166 const struct macvlan_dev *src;
167 struct net_device *dev;
168 unsigned int len = 0;
169 int ret = NET_RX_DROP;
170
171 port = macvlan_port_get_rcu(skb->dev);
172 if (is_multicast_ether_addr(eth->h_dest)) {
173 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
174 if (!skb)
175 return RX_HANDLER_CONSUMED;
176 eth = eth_hdr(skb);
177 src = macvlan_hash_lookup(port, eth->h_source);
178 if (!src)
179 /* frame comes from an external address */
180 macvlan_broadcast(skb, port, NULL,
181 MACVLAN_MODE_PRIVATE |
182 MACVLAN_MODE_VEPA |
183 MACVLAN_MODE_PASSTHRU|
184 MACVLAN_MODE_BRIDGE);
185 else if (src->mode == MACVLAN_MODE_VEPA)
186 /* flood to everyone except source */
187 macvlan_broadcast(skb, port, src->dev,
188 MACVLAN_MODE_VEPA |
189 MACVLAN_MODE_BRIDGE);
190 else if (src->mode == MACVLAN_MODE_BRIDGE)
191 /*
192 * flood only to VEPA ports, bridge ports
193 * already saw the frame on the way out.
194 */
195 macvlan_broadcast(skb, port, src->dev,
196 MACVLAN_MODE_VEPA);
197 else {
198 /* forward to original port. */
199 vlan = src;
200 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
201 goto out;
202 }
203
204 return RX_HANDLER_PASS;
205 }
206
207 if (port->passthru)
208 vlan = list_first_or_null_rcu(&port->vlans,
209 struct macvlan_dev, list);
210 else
211 vlan = macvlan_hash_lookup(port, eth->h_dest);
212 if (vlan == NULL)
213 return RX_HANDLER_PASS;
214
215 dev = vlan->dev;
216 if (unlikely(!(dev->flags & IFF_UP))) {
217 kfree_skb(skb);
218 return RX_HANDLER_CONSUMED;
219 }
220 len = skb->len + ETH_HLEN;
221 skb = skb_share_check(skb, GFP_ATOMIC);
222 if (!skb)
223 goto out;
224
225 skb->dev = dev;
226 skb->pkt_type = PACKET_HOST;
227
228 ret = vlan->receive(skb);
229
230 out:
231 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
232 return RX_HANDLER_CONSUMED;
233 }
234
235 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
236 {
237 const struct macvlan_dev *vlan = netdev_priv(dev);
238 const struct macvlan_port *port = vlan->port;
239 const struct macvlan_dev *dest;
240 __u8 ip_summed = skb->ip_summed;
241
242 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
243 const struct ethhdr *eth = (void *)skb->data;
244 skb->ip_summed = CHECKSUM_UNNECESSARY;
245
246 /* send to other bridge ports directly */
247 if (is_multicast_ether_addr(eth->h_dest)) {
248 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
249 goto xmit_world;
250 }
251
252 dest = macvlan_hash_lookup(port, eth->h_dest);
253 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
254 /* send to lowerdev first for its network taps */
255 dev_forward_skb(vlan->lowerdev, skb);
256
257 return NET_XMIT_SUCCESS;
258 }
259 }
260
261 xmit_world:
262 skb->ip_summed = ip_summed;
263 skb->dev = vlan->lowerdev;
264 return dev_queue_xmit(skb);
265 }
266
267 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
268 struct net_device *dev)
269 {
270 unsigned int len = skb->len;
271 int ret;
272 const struct macvlan_dev *vlan = netdev_priv(dev);
273
274 ret = macvlan_queue_xmit(skb, dev);
275 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
276 struct macvlan_pcpu_stats *pcpu_stats;
277
278 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
279 u64_stats_update_begin(&pcpu_stats->syncp);
280 pcpu_stats->tx_packets++;
281 pcpu_stats->tx_bytes += len;
282 u64_stats_update_end(&pcpu_stats->syncp);
283 } else {
284 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
285 }
286 return ret;
287 }
288 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
289
290 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
291 unsigned short type, const void *daddr,
292 const void *saddr, unsigned len)
293 {
294 const struct macvlan_dev *vlan = netdev_priv(dev);
295 struct net_device *lowerdev = vlan->lowerdev;
296
297 return dev_hard_header(skb, lowerdev, type, daddr,
298 saddr ? : dev->dev_addr, len);
299 }
300
301 static const struct header_ops macvlan_hard_header_ops = {
302 .create = macvlan_hard_header,
303 .rebuild = eth_rebuild_header,
304 .parse = eth_header_parse,
305 .cache = eth_header_cache,
306 .cache_update = eth_header_cache_update,
307 };
308
309 static int macvlan_open(struct net_device *dev)
310 {
311 struct macvlan_dev *vlan = netdev_priv(dev);
312 struct net_device *lowerdev = vlan->lowerdev;
313 int err;
314
315 if (vlan->port->passthru) {
316 dev_set_promiscuity(lowerdev, 1);
317 goto hash_add;
318 }
319
320 err = -EBUSY;
321 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
322 goto out;
323
324 err = dev_uc_add(lowerdev, dev->dev_addr);
325 if (err < 0)
326 goto out;
327 if (dev->flags & IFF_ALLMULTI) {
328 err = dev_set_allmulti(lowerdev, 1);
329 if (err < 0)
330 goto del_unicast;
331 }
332
333 hash_add:
334 macvlan_hash_add(vlan);
335 return 0;
336
337 del_unicast:
338 dev_uc_del(lowerdev, dev->dev_addr);
339 out:
340 return err;
341 }
342
343 static int macvlan_stop(struct net_device *dev)
344 {
345 struct macvlan_dev *vlan = netdev_priv(dev);
346 struct net_device *lowerdev = vlan->lowerdev;
347
348 if (vlan->port->passthru) {
349 dev_set_promiscuity(lowerdev, -1);
350 goto hash_del;
351 }
352
353 dev_mc_unsync(lowerdev, dev);
354 if (dev->flags & IFF_ALLMULTI)
355 dev_set_allmulti(lowerdev, -1);
356
357 dev_uc_del(lowerdev, dev->dev_addr);
358
359 hash_del:
360 macvlan_hash_del(vlan, !dev->dismantle);
361 return 0;
362 }
363
364 static int macvlan_set_mac_address(struct net_device *dev, void *p)
365 {
366 struct macvlan_dev *vlan = netdev_priv(dev);
367 struct net_device *lowerdev = vlan->lowerdev;
368 struct sockaddr *addr = p;
369 int err;
370
371 if (!is_valid_ether_addr(addr->sa_data))
372 return -EADDRNOTAVAIL;
373
374 if (!(dev->flags & IFF_UP)) {
375 /* Just copy in the new address */
376 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
377 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
378 } else {
379 /* Rehash and update the device filters */
380 if (macvlan_addr_busy(vlan->port, addr->sa_data))
381 return -EBUSY;
382
383 err = dev_uc_add(lowerdev, addr->sa_data);
384 if (err)
385 return err;
386
387 dev_uc_del(lowerdev, dev->dev_addr);
388
389 macvlan_hash_change_addr(vlan, addr->sa_data);
390 }
391 return 0;
392 }
393
394 static void macvlan_change_rx_flags(struct net_device *dev, int change)
395 {
396 struct macvlan_dev *vlan = netdev_priv(dev);
397 struct net_device *lowerdev = vlan->lowerdev;
398
399 if (change & IFF_ALLMULTI)
400 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
401 }
402
403 static void macvlan_set_multicast_list(struct net_device *dev)
404 {
405 struct macvlan_dev *vlan = netdev_priv(dev);
406
407 dev_mc_sync(vlan->lowerdev, dev);
408 }
409
410 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
411 {
412 struct macvlan_dev *vlan = netdev_priv(dev);
413
414 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
415 return -EINVAL;
416 dev->mtu = new_mtu;
417 return 0;
418 }
419
420 /*
421 * macvlan network devices have devices nesting below it and are a special
422 * "super class" of normal network devices; split their locks off into a
423 * separate class since they always nest.
424 */
425 static struct lock_class_key macvlan_netdev_xmit_lock_key;
426 static struct lock_class_key macvlan_netdev_addr_lock_key;
427
428 #define MACVLAN_FEATURES \
429 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
430 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
431 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
432 NETIF_F_HW_VLAN_FILTER)
433
434 #define MACVLAN_STATE_MASK \
435 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
436
437 static void macvlan_set_lockdep_class_one(struct net_device *dev,
438 struct netdev_queue *txq,
439 void *_unused)
440 {
441 lockdep_set_class(&txq->_xmit_lock,
442 &macvlan_netdev_xmit_lock_key);
443 }
444
445 static void macvlan_set_lockdep_class(struct net_device *dev)
446 {
447 lockdep_set_class(&dev->addr_list_lock,
448 &macvlan_netdev_addr_lock_key);
449 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
450 }
451
452 static int macvlan_init(struct net_device *dev)
453 {
454 struct macvlan_dev *vlan = netdev_priv(dev);
455 const struct net_device *lowerdev = vlan->lowerdev;
456
457 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
458 (lowerdev->state & MACVLAN_STATE_MASK);
459 dev->features = lowerdev->features & MACVLAN_FEATURES;
460 dev->features |= NETIF_F_LLTX;
461 dev->gso_max_size = lowerdev->gso_max_size;
462 dev->iflink = lowerdev->ifindex;
463 dev->hard_header_len = lowerdev->hard_header_len;
464
465 macvlan_set_lockdep_class(dev);
466
467 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
468 if (!vlan->pcpu_stats)
469 return -ENOMEM;
470
471 return 0;
472 }
473
474 static void macvlan_uninit(struct net_device *dev)
475 {
476 struct macvlan_dev *vlan = netdev_priv(dev);
477 struct macvlan_port *port = vlan->port;
478
479 free_percpu(vlan->pcpu_stats);
480
481 port->count -= 1;
482 if (!port->count)
483 macvlan_port_destroy(port->dev);
484 }
485
486 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
487 struct rtnl_link_stats64 *stats)
488 {
489 struct macvlan_dev *vlan = netdev_priv(dev);
490
491 if (vlan->pcpu_stats) {
492 struct macvlan_pcpu_stats *p;
493 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
494 u32 rx_errors = 0, tx_dropped = 0;
495 unsigned int start;
496 int i;
497
498 for_each_possible_cpu(i) {
499 p = per_cpu_ptr(vlan->pcpu_stats, i);
500 do {
501 start = u64_stats_fetch_begin_bh(&p->syncp);
502 rx_packets = p->rx_packets;
503 rx_bytes = p->rx_bytes;
504 rx_multicast = p->rx_multicast;
505 tx_packets = p->tx_packets;
506 tx_bytes = p->tx_bytes;
507 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
508
509 stats->rx_packets += rx_packets;
510 stats->rx_bytes += rx_bytes;
511 stats->multicast += rx_multicast;
512 stats->tx_packets += tx_packets;
513 stats->tx_bytes += tx_bytes;
514 /* rx_errors & tx_dropped are u32, updated
515 * without syncp protection.
516 */
517 rx_errors += p->rx_errors;
518 tx_dropped += p->tx_dropped;
519 }
520 stats->rx_errors = rx_errors;
521 stats->rx_dropped = rx_errors;
522 stats->tx_dropped = tx_dropped;
523 }
524 return stats;
525 }
526
527 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
528 unsigned short vid)
529 {
530 struct macvlan_dev *vlan = netdev_priv(dev);
531 struct net_device *lowerdev = vlan->lowerdev;
532
533 return vlan_vid_add(lowerdev, vid);
534 }
535
536 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
537 unsigned short vid)
538 {
539 struct macvlan_dev *vlan = netdev_priv(dev);
540 struct net_device *lowerdev = vlan->lowerdev;
541
542 vlan_vid_del(lowerdev, vid);
543 return 0;
544 }
545
546 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
547 struct ethtool_drvinfo *drvinfo)
548 {
549 snprintf(drvinfo->driver, 32, "macvlan");
550 snprintf(drvinfo->version, 32, "0.1");
551 }
552
553 static int macvlan_ethtool_get_settings(struct net_device *dev,
554 struct ethtool_cmd *cmd)
555 {
556 const struct macvlan_dev *vlan = netdev_priv(dev);
557
558 return __ethtool_get_settings(vlan->lowerdev, cmd);
559 }
560
561 static const struct ethtool_ops macvlan_ethtool_ops = {
562 .get_link = ethtool_op_get_link,
563 .get_settings = macvlan_ethtool_get_settings,
564 .get_drvinfo = macvlan_ethtool_get_drvinfo,
565 };
566
567 static const struct net_device_ops macvlan_netdev_ops = {
568 .ndo_init = macvlan_init,
569 .ndo_uninit = macvlan_uninit,
570 .ndo_open = macvlan_open,
571 .ndo_stop = macvlan_stop,
572 .ndo_start_xmit = macvlan_start_xmit,
573 .ndo_change_mtu = macvlan_change_mtu,
574 .ndo_change_rx_flags = macvlan_change_rx_flags,
575 .ndo_set_mac_address = macvlan_set_mac_address,
576 .ndo_set_rx_mode = macvlan_set_multicast_list,
577 .ndo_get_stats64 = macvlan_dev_get_stats64,
578 .ndo_validate_addr = eth_validate_addr,
579 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
580 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
581 };
582
583 void macvlan_common_setup(struct net_device *dev)
584 {
585 ether_setup(dev);
586
587 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
588 dev->priv_flags |= IFF_UNICAST_FLT;
589 dev->netdev_ops = &macvlan_netdev_ops;
590 dev->destructor = free_netdev;
591 dev->header_ops = &macvlan_hard_header_ops,
592 dev->ethtool_ops = &macvlan_ethtool_ops;
593 }
594 EXPORT_SYMBOL_GPL(macvlan_common_setup);
595
596 static void macvlan_setup(struct net_device *dev)
597 {
598 macvlan_common_setup(dev);
599 dev->tx_queue_len = 0;
600 }
601
602 static int macvlan_port_create(struct net_device *dev)
603 {
604 struct macvlan_port *port;
605 unsigned int i;
606 int err;
607
608 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
609 return -EINVAL;
610
611 port = kzalloc(sizeof(*port), GFP_KERNEL);
612 if (port == NULL)
613 return -ENOMEM;
614
615 port->passthru = false;
616 port->dev = dev;
617 INIT_LIST_HEAD(&port->vlans);
618 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
619 INIT_HLIST_HEAD(&port->vlan_hash[i]);
620
621 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
622 if (err)
623 kfree(port);
624 else
625 dev->priv_flags |= IFF_MACVLAN_PORT;
626 return err;
627 }
628
629 static void macvlan_port_destroy(struct net_device *dev)
630 {
631 struct macvlan_port *port = macvlan_port_get(dev);
632
633 dev->priv_flags &= ~IFF_MACVLAN_PORT;
634 netdev_rx_handler_unregister(dev);
635 kfree_rcu(port, rcu);
636 }
637
638 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
639 {
640 if (tb[IFLA_ADDRESS]) {
641 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
642 return -EINVAL;
643 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
644 return -EADDRNOTAVAIL;
645 }
646
647 if (data && data[IFLA_MACVLAN_MODE]) {
648 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
649 case MACVLAN_MODE_PRIVATE:
650 case MACVLAN_MODE_VEPA:
651 case MACVLAN_MODE_BRIDGE:
652 case MACVLAN_MODE_PASSTHRU:
653 break;
654 default:
655 return -EINVAL;
656 }
657 }
658 return 0;
659 }
660
661 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
662 struct nlattr *tb[], struct nlattr *data[],
663 int (*receive)(struct sk_buff *skb),
664 int (*forward)(struct net_device *dev,
665 struct sk_buff *skb))
666 {
667 struct macvlan_dev *vlan = netdev_priv(dev);
668 struct macvlan_port *port;
669 struct net_device *lowerdev;
670 int err;
671
672 if (!tb[IFLA_LINK])
673 return -EINVAL;
674
675 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
676 if (lowerdev == NULL)
677 return -ENODEV;
678
679 /* When creating macvlans on top of other macvlans - use
680 * the real device as the lowerdev.
681 */
682 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
683 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
684 lowerdev = lowervlan->lowerdev;
685 }
686
687 if (!tb[IFLA_MTU])
688 dev->mtu = lowerdev->mtu;
689 else if (dev->mtu > lowerdev->mtu)
690 return -EINVAL;
691
692 if (!tb[IFLA_ADDRESS])
693 eth_hw_addr_random(dev);
694
695 if (!macvlan_port_exists(lowerdev)) {
696 err = macvlan_port_create(lowerdev);
697 if (err < 0)
698 return err;
699 }
700 port = macvlan_port_get(lowerdev);
701
702 /* Only 1 macvlan device can be created in passthru mode */
703 if (port->passthru)
704 return -EINVAL;
705
706 vlan->lowerdev = lowerdev;
707 vlan->dev = dev;
708 vlan->port = port;
709 vlan->receive = receive;
710 vlan->forward = forward;
711
712 vlan->mode = MACVLAN_MODE_VEPA;
713 if (data && data[IFLA_MACVLAN_MODE])
714 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
715
716 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
717 if (port->count)
718 return -EINVAL;
719 port->passthru = true;
720 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
721 }
722
723 port->count += 1;
724 err = register_netdevice(dev);
725 if (err < 0)
726 goto destroy_port;
727
728 list_add_tail_rcu(&vlan->list, &port->vlans);
729 netif_stacked_transfer_operstate(lowerdev, dev);
730
731 return 0;
732
733 destroy_port:
734 port->count -= 1;
735 if (!port->count)
736 macvlan_port_destroy(lowerdev);
737
738 return err;
739 }
740 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
741
742 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
743 struct nlattr *tb[], struct nlattr *data[])
744 {
745 return macvlan_common_newlink(src_net, dev, tb, data,
746 netif_rx,
747 dev_forward_skb);
748 }
749
750 void macvlan_dellink(struct net_device *dev, struct list_head *head)
751 {
752 struct macvlan_dev *vlan = netdev_priv(dev);
753
754 list_del_rcu(&vlan->list);
755 unregister_netdevice_queue(dev, head);
756 }
757 EXPORT_SYMBOL_GPL(macvlan_dellink);
758
759 static int macvlan_changelink(struct net_device *dev,
760 struct nlattr *tb[], struct nlattr *data[])
761 {
762 struct macvlan_dev *vlan = netdev_priv(dev);
763 if (data && data[IFLA_MACVLAN_MODE])
764 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
765 return 0;
766 }
767
768 static size_t macvlan_get_size(const struct net_device *dev)
769 {
770 return nla_total_size(4);
771 }
772
773 static int macvlan_fill_info(struct sk_buff *skb,
774 const struct net_device *dev)
775 {
776 struct macvlan_dev *vlan = netdev_priv(dev);
777
778 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
779 return 0;
780
781 nla_put_failure:
782 return -EMSGSIZE;
783 }
784
785 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
786 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
787 };
788
789 int macvlan_link_register(struct rtnl_link_ops *ops)
790 {
791 /* common fields */
792 ops->priv_size = sizeof(struct macvlan_dev);
793 ops->validate = macvlan_validate;
794 ops->maxtype = IFLA_MACVLAN_MAX;
795 ops->policy = macvlan_policy;
796 ops->changelink = macvlan_changelink;
797 ops->get_size = macvlan_get_size;
798 ops->fill_info = macvlan_fill_info;
799
800 return rtnl_link_register(ops);
801 };
802 EXPORT_SYMBOL_GPL(macvlan_link_register);
803
804 static struct rtnl_link_ops macvlan_link_ops = {
805 .kind = "macvlan",
806 .setup = macvlan_setup,
807 .newlink = macvlan_newlink,
808 .dellink = macvlan_dellink,
809 };
810
811 static int macvlan_device_event(struct notifier_block *unused,
812 unsigned long event, void *ptr)
813 {
814 struct net_device *dev = ptr;
815 struct macvlan_dev *vlan, *next;
816 struct macvlan_port *port;
817 LIST_HEAD(list_kill);
818
819 if (!macvlan_port_exists(dev))
820 return NOTIFY_DONE;
821
822 port = macvlan_port_get(dev);
823
824 switch (event) {
825 case NETDEV_CHANGE:
826 list_for_each_entry(vlan, &port->vlans, list)
827 netif_stacked_transfer_operstate(vlan->lowerdev,
828 vlan->dev);
829 break;
830 case NETDEV_FEAT_CHANGE:
831 list_for_each_entry(vlan, &port->vlans, list) {
832 vlan->dev->features = dev->features & MACVLAN_FEATURES;
833 vlan->dev->gso_max_size = dev->gso_max_size;
834 netdev_features_change(vlan->dev);
835 }
836 break;
837 case NETDEV_UNREGISTER:
838 /* twiddle thumbs on netns device moves */
839 if (dev->reg_state != NETREG_UNREGISTERING)
840 break;
841
842 list_for_each_entry_safe(vlan, next, &port->vlans, list)
843 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
844 unregister_netdevice_many(&list_kill);
845 list_del(&list_kill);
846 break;
847 case NETDEV_PRE_TYPE_CHANGE:
848 /* Forbid underlaying device to change its type. */
849 return NOTIFY_BAD;
850 }
851 return NOTIFY_DONE;
852 }
853
854 static struct notifier_block macvlan_notifier_block __read_mostly = {
855 .notifier_call = macvlan_device_event,
856 };
857
858 static int __init macvlan_init_module(void)
859 {
860 int err;
861
862 register_netdevice_notifier(&macvlan_notifier_block);
863
864 err = macvlan_link_register(&macvlan_link_ops);
865 if (err < 0)
866 goto err1;
867 return 0;
868 err1:
869 unregister_netdevice_notifier(&macvlan_notifier_block);
870 return err;
871 }
872
873 static void __exit macvlan_cleanup_module(void)
874 {
875 rtnl_link_unregister(&macvlan_link_ops);
876 unregister_netdevice_notifier(&macvlan_notifier_block);
877 }
878
879 module_init(macvlan_init_module);
880 module_exit(macvlan_cleanup_module);
881
882 MODULE_LICENSE("GPL");
883 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
884 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
885 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux with added FPC-III support