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