/drivers/net/macvlan.c
C | 847 lines | 662 code | 137 blank | 48 comment | 99 complexity | a6f9cb34ccd8a15d197c6740ea984aae MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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
36struct 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
45static 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
52static 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
65static 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
73static 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
80static 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
91static 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
108static 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
129static 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 */
159static 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
217out:
218 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
219 return RX_HANDLER_CONSUMED;
220}
221
222static 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 dev_forward_skb(vlan->lowerdev, skb);
243
244 return NET_XMIT_SUCCESS;
245 }
246 }
247
248xmit_world:
249 skb->ip_summed = ip_summed;
250 skb_set_dev(skb, vlan->lowerdev);
251 return dev_queue_xmit(skb);
252}
253
254netdev_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}
275EXPORT_SYMBOL_GPL(macvlan_start_xmit);
276
277static 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
288static 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
296static 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
320hash_add:
321 macvlan_hash_add(vlan);
322 return 0;
323
324del_unicast:
325 dev_uc_del(lowerdev, dev->dev_addr);
326out:
327 return err;
328}
329
330static 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
346hash_del:
347 macvlan_hash_del(vlan, !dev->dismantle);
348 return 0;
349}
350
351static 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
380static 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
389static 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
396static 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 */
411static struct lock_class_key macvlan_netdev_xmit_lock_key;
412static 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
419#define MACVLAN_STATE_MASK \
420 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
421
422static void macvlan_set_lockdep_class_one(struct net_device *dev,
423 struct netdev_queue *txq,
424 void *_unused)
425{
426 lockdep_set_class(&txq->_xmit_lock,
427 &macvlan_netdev_xmit_lock_key);
428}
429
430static void macvlan_set_lockdep_class(struct net_device *dev)
431{
432 lockdep_set_class(&dev->addr_list_lock,
433 &macvlan_netdev_addr_lock_key);
434 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
435}
436
437static int macvlan_init(struct net_device *dev)
438{
439 struct macvlan_dev *vlan = netdev_priv(dev);
440 const struct net_device *lowerdev = vlan->lowerdev;
441
442 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
443 (lowerdev->state & MACVLAN_STATE_MASK);
444 dev->features = lowerdev->features & MACVLAN_FEATURES;
445 dev->features |= NETIF_F_LLTX;
446 dev->gso_max_size = lowerdev->gso_max_size;
447 dev->iflink = lowerdev->ifindex;
448 dev->hard_header_len = lowerdev->hard_header_len;
449
450 macvlan_set_lockdep_class(dev);
451
452 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
453 if (!vlan->pcpu_stats)
454 return -ENOMEM;
455
456 return 0;
457}
458
459static void macvlan_uninit(struct net_device *dev)
460{
461 struct macvlan_dev *vlan = netdev_priv(dev);
462 struct macvlan_port *port = vlan->port;
463
464 free_percpu(vlan->pcpu_stats);
465
466 port->count -= 1;
467 if (!port->count)
468 macvlan_port_destroy(port->dev);
469}
470
471static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
472 struct rtnl_link_stats64 *stats)
473{
474 struct macvlan_dev *vlan = netdev_priv(dev);
475
476 if (vlan->pcpu_stats) {
477 struct macvlan_pcpu_stats *p;
478 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
479 u32 rx_errors = 0, tx_dropped = 0;
480 unsigned int start;
481 int i;
482
483 for_each_possible_cpu(i) {
484 p = per_cpu_ptr(vlan->pcpu_stats, i);
485 do {
486 start = u64_stats_fetch_begin_bh(&p->syncp);
487 rx_packets = p->rx_packets;
488 rx_bytes = p->rx_bytes;
489 rx_multicast = p->rx_multicast;
490 tx_packets = p->tx_packets;
491 tx_bytes = p->tx_bytes;
492 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
493
494 stats->rx_packets += rx_packets;
495 stats->rx_bytes += rx_bytes;
496 stats->multicast += rx_multicast;
497 stats->tx_packets += tx_packets;
498 stats->tx_bytes += tx_bytes;
499 /* rx_errors & tx_dropped are u32, updated
500 * without syncp protection.
501 */
502 rx_errors += p->rx_errors;
503 tx_dropped += p->tx_dropped;
504 }
505 stats->rx_errors = rx_errors;
506 stats->rx_dropped = rx_errors;
507 stats->tx_dropped = tx_dropped;
508 }
509 return stats;
510}
511
512static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
513 struct ethtool_drvinfo *drvinfo)
514{
515 snprintf(drvinfo->driver, 32, "macvlan");
516 snprintf(drvinfo->version, 32, "0.1");
517}
518
519static int macvlan_ethtool_get_settings(struct net_device *dev,
520 struct ethtool_cmd *cmd)
521{
522 const struct macvlan_dev *vlan = netdev_priv(dev);
523 return dev_ethtool_get_settings(vlan->lowerdev, cmd);
524}
525
526static const struct ethtool_ops macvlan_ethtool_ops = {
527 .get_link = ethtool_op_get_link,
528 .get_settings = macvlan_ethtool_get_settings,
529 .get_drvinfo = macvlan_ethtool_get_drvinfo,
530};
531
532static const struct net_device_ops macvlan_netdev_ops = {
533 .ndo_init = macvlan_init,
534 .ndo_uninit = macvlan_uninit,
535 .ndo_open = macvlan_open,
536 .ndo_stop = macvlan_stop,
537 .ndo_start_xmit = macvlan_start_xmit,
538 .ndo_change_mtu = macvlan_change_mtu,
539 .ndo_change_rx_flags = macvlan_change_rx_flags,
540 .ndo_set_mac_address = macvlan_set_mac_address,
541 .ndo_set_multicast_list = macvlan_set_multicast_list,
542 .ndo_get_stats64 = macvlan_dev_get_stats64,
543 .ndo_validate_addr = eth_validate_addr,
544};
545
546void macvlan_common_setup(struct net_device *dev)
547{
548 ether_setup(dev);
549
550 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
551 dev->netdev_ops = &macvlan_netdev_ops;
552 dev->destructor = free_netdev;
553 dev->header_ops = &macvlan_hard_header_ops,
554 dev->ethtool_ops = &macvlan_ethtool_ops;
555}
556EXPORT_SYMBOL_GPL(macvlan_common_setup);
557
558static void macvlan_setup(struct net_device *dev)
559{
560 macvlan_common_setup(dev);
561 dev->tx_queue_len = 0;
562}
563
564static int macvlan_port_create(struct net_device *dev)
565{
566 struct macvlan_port *port;
567 unsigned int i;
568 int err;
569
570 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
571 return -EINVAL;
572
573 port = kzalloc(sizeof(*port), GFP_KERNEL);
574 if (port == NULL)
575 return -ENOMEM;
576
577 port->passthru = false;
578 port->dev = dev;
579 INIT_LIST_HEAD(&port->vlans);
580 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
581 INIT_HLIST_HEAD(&port->vlan_hash[i]);
582
583 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
584 if (err)
585 kfree(port);
586 else
587 dev->priv_flags |= IFF_MACVLAN_PORT;
588 return err;
589}
590
591static void macvlan_port_destroy(struct net_device *dev)
592{
593 struct macvlan_port *port = macvlan_port_get(dev);
594
595 dev->priv_flags &= ~IFF_MACVLAN_PORT;
596 netdev_rx_handler_unregister(dev);
597 kfree_rcu(port, rcu);
598}
599
600static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
601{
602 if (tb[IFLA_ADDRESS]) {
603 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
604 return -EINVAL;
605 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
606 return -EADDRNOTAVAIL;
607 }
608
609 if (data && data[IFLA_MACVLAN_MODE]) {
610 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
611 case MACVLAN_MODE_PRIVATE:
612 case MACVLAN_MODE_VEPA:
613 case MACVLAN_MODE_BRIDGE:
614 case MACVLAN_MODE_PASSTHRU:
615 break;
616 default:
617 return -EINVAL;
618 }
619 }
620 return 0;
621}
622
623int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
624 struct nlattr *tb[], struct nlattr *data[],
625 int (*receive)(struct sk_buff *skb),
626 int (*forward)(struct net_device *dev,
627 struct sk_buff *skb))
628{
629 struct macvlan_dev *vlan = netdev_priv(dev);
630 struct macvlan_port *port;
631 struct net_device *lowerdev;
632 int err;
633
634 if (!tb[IFLA_LINK])
635 return -EINVAL;
636
637 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
638 if (lowerdev == NULL)
639 return -ENODEV;
640
641 /* When creating macvlans on top of other macvlans - use
642 * the real device as the lowerdev.
643 */
644 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
645 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
646 lowerdev = lowervlan->lowerdev;
647 }
648
649 if (!tb[IFLA_MTU])
650 dev->mtu = lowerdev->mtu;
651 else if (dev->mtu > lowerdev->mtu)
652 return -EINVAL;
653
654 if (!tb[IFLA_ADDRESS])
655 random_ether_addr(dev->dev_addr);
656
657 if (!macvlan_port_exists(lowerdev)) {
658 err = macvlan_port_create(lowerdev);
659 if (err < 0)
660 return err;
661 }
662 port = macvlan_port_get(lowerdev);
663
664 /* Only 1 macvlan device can be created in passthru mode */
665 if (port->passthru)
666 return -EINVAL;
667
668 vlan->lowerdev = lowerdev;
669 vlan->dev = dev;
670 vlan->port = port;
671 vlan->receive = receive;
672 vlan->forward = forward;
673
674 vlan->mode = MACVLAN_MODE_VEPA;
675 if (data && data[IFLA_MACVLAN_MODE])
676 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
677
678 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
679 if (port->count)
680 return -EINVAL;
681 port->passthru = true;
682 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
683 }
684
685 port->count += 1;
686 err = register_netdevice(dev);
687 if (err < 0)
688 goto destroy_port;
689
690 list_add_tail(&vlan->list, &port->vlans);
691 netif_stacked_transfer_operstate(lowerdev, dev);
692
693 return 0;
694
695destroy_port:
696 port->count -= 1;
697 if (!port->count)
698 macvlan_port_destroy(lowerdev);
699
700 return err;
701}
702EXPORT_SYMBOL_GPL(macvlan_common_newlink);
703
704static int macvlan_newlink(struct net *src_net, struct net_device *dev,
705 struct nlattr *tb[], struct nlattr *data[])
706{
707 return macvlan_common_newlink(src_net, dev, tb, data,
708 netif_rx,
709 dev_forward_skb);
710}
711
712void macvlan_dellink(struct net_device *dev, struct list_head *head)
713{
714 struct macvlan_dev *vlan = netdev_priv(dev);
715
716 list_del(&vlan->list);
717 unregister_netdevice_queue(dev, head);
718}
719EXPORT_SYMBOL_GPL(macvlan_dellink);
720
721static int macvlan_changelink(struct net_device *dev,
722 struct nlattr *tb[], struct nlattr *data[])
723{
724 struct macvlan_dev *vlan = netdev_priv(dev);
725 if (data && data[IFLA_MACVLAN_MODE])
726 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
727 return 0;
728}
729
730static size_t macvlan_get_size(const struct net_device *dev)
731{
732 return nla_total_size(4);
733}
734
735static int macvlan_fill_info(struct sk_buff *skb,
736 const struct net_device *dev)
737{
738 struct macvlan_dev *vlan = netdev_priv(dev);
739
740 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
741 return 0;
742
743nla_put_failure:
744 return -EMSGSIZE;
745}
746
747static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
748 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
749};
750
751int macvlan_link_register(struct rtnl_link_ops *ops)
752{
753 /* common fields */
754 ops->priv_size = sizeof(struct macvlan_dev);
755 ops->validate = macvlan_validate;
756 ops->maxtype = IFLA_MACVLAN_MAX;
757 ops->policy = macvlan_policy;
758 ops->changelink = macvlan_changelink;
759 ops->get_size = macvlan_get_size;
760 ops->fill_info = macvlan_fill_info;
761
762 return rtnl_link_register(ops);
763};
764EXPORT_SYMBOL_GPL(macvlan_link_register);
765
766static struct rtnl_link_ops macvlan_link_ops = {
767 .kind = "macvlan",
768 .setup = macvlan_setup,
769 .newlink = macvlan_newlink,
770 .dellink = macvlan_dellink,
771};
772
773static int macvlan_device_event(struct notifier_block *unused,
774 unsigned long event, void *ptr)
775{
776 struct net_device *dev = ptr;
777 struct macvlan_dev *vlan, *next;
778 struct macvlan_port *port;
779 LIST_HEAD(list_kill);
780
781 if (!macvlan_port_exists(dev))
782 return NOTIFY_DONE;
783
784 port = macvlan_port_get(dev);
785
786 switch (event) {
787 case NETDEV_CHANGE:
788 list_for_each_entry(vlan, &port->vlans, list)
789 netif_stacked_transfer_operstate(vlan->lowerdev,
790 vlan->dev);
791 break;
792 case NETDEV_FEAT_CHANGE:
793 list_for_each_entry(vlan, &port->vlans, list) {
794 vlan->dev->features = dev->features & MACVLAN_FEATURES;
795 vlan->dev->gso_max_size = dev->gso_max_size;
796 netdev_features_change(vlan->dev);
797 }
798 break;
799 case NETDEV_UNREGISTER:
800 /* twiddle thumbs on netns device moves */
801 if (dev->reg_state != NETREG_UNREGISTERING)
802 break;
803
804 list_for_each_entry_safe(vlan, next, &port->vlans, list)
805 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
806 unregister_netdevice_many(&list_kill);
807 list_del(&list_kill);
808 break;
809 case NETDEV_PRE_TYPE_CHANGE:
810 /* Forbid underlaying device to change its type. */
811 return NOTIFY_BAD;
812 }
813 return NOTIFY_DONE;
814}
815
816static struct notifier_block macvlan_notifier_block __read_mostly = {
817 .notifier_call = macvlan_device_event,
818};
819
820static int __init macvlan_init_module(void)
821{
822 int err;
823
824 register_netdevice_notifier(&macvlan_notifier_block);
825
826 err = macvlan_link_register(&macvlan_link_ops);
827 if (err < 0)
828 goto err1;
829 return 0;
830err1:
831 unregister_netdevice_notifier(&macvlan_notifier_block);
832 return err;
833}
834
835static void __exit macvlan_cleanup_module(void)
836{
837 rtnl_link_unregister(&macvlan_link_ops);
838 unregister_netdevice_notifier(&macvlan_notifier_block);
839}
840
841module_init(macvlan_init_module);
842module_exit(macvlan_cleanup_module);
843
844MODULE_LICENSE("GPL");
845MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
846MODULE_DESCRIPTION("Driver for MAC address based VLANs");
847MODULE_ALIAS_RTNL_LINK("macvlan");