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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 <linux/hash.h>
33#include <net/rtnetlink.h>
34#include <net/xfrm.h>
35
36#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
37
38struct macvlan_port {
39 struct net_device *dev;
40 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
41 struct list_head vlans;
42 struct rcu_head rcu;
43 bool passthru;
44 int count;
45};
46
47static void macvlan_port_destroy(struct net_device *dev);
48
49static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
50{
51 return rcu_dereference(dev->rx_handler_data);
52}
53
54static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
55{
56 return rtnl_dereference(dev->rx_handler_data);
57}
58
59#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
60
61static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
62 const unsigned char *addr)
63{
64 struct macvlan_dev *vlan;
65
66 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
67 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
68 return vlan;
69 }
70 return NULL;
71}
72
73static void macvlan_hash_add(struct macvlan_dev *vlan)
74{
75 struct macvlan_port *port = vlan->port;
76 const unsigned char *addr = vlan->dev->dev_addr;
77
78 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
79}
80
81static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
82{
83 hlist_del_rcu(&vlan->hlist);
84 if (sync)
85 synchronize_rcu();
86}
87
88static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
89 const unsigned char *addr)
90{
91 macvlan_hash_del(vlan, true);
92 /* Now that we are unhashed it is safe to change the device
93 * address without confusing packet delivery.
94 */
95 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
96 macvlan_hash_add(vlan);
97}
98
99static int macvlan_addr_busy(const struct macvlan_port *port,
100 const unsigned char *addr)
101{
102 /* Test to see if the specified multicast address is
103 * currently in use by the underlying device or
104 * another macvlan.
105 */
106 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
107 return 1;
108
109 if (macvlan_hash_lookup(port, addr))
110 return 1;
111
112 return 0;
113}
114
115
116static int macvlan_broadcast_one(struct sk_buff *skb,
117 const struct macvlan_dev *vlan,
118 const struct ethhdr *eth, bool local)
119{
120 struct net_device *dev = vlan->dev;
121
122 if (local)
123 return dev_forward_skb(dev, skb);
124
125 skb->dev = dev;
126 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
127 skb->pkt_type = PACKET_BROADCAST;
128 else
129 skb->pkt_type = PACKET_MULTICAST;
130
131 return netif_rx(skb);
132}
133
134static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
135{
136 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
137}
138
139
140static unsigned int mc_hash(const struct macvlan_dev *vlan,
141 const unsigned char *addr)
142{
143 u32 val = __get_unaligned_cpu32(addr + 2);
144
145 val ^= macvlan_hash_mix(vlan);
146 return hash_32(val, MACVLAN_MC_FILTER_BITS);
147}
148
149static void macvlan_broadcast(struct sk_buff *skb,
150 const struct macvlan_port *port,
151 struct net_device *src,
152 enum macvlan_mode mode)
153{
154 const struct ethhdr *eth = eth_hdr(skb);
155 const struct macvlan_dev *vlan;
156 struct sk_buff *nskb;
157 unsigned int i;
158 int err;
159 unsigned int hash;
160
161 if (skb->protocol == htons(ETH_P_PAUSE))
162 return;
163
164 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
165 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
166 if (vlan->dev == src || !(vlan->mode & mode))
167 continue;
168
169 hash = mc_hash(vlan, eth->h_dest);
170 if (!test_bit(hash, vlan->mc_filter))
171 continue;
172
173 err = NET_RX_DROP;
174 nskb = skb_clone(skb, GFP_ATOMIC);
175 if (likely(nskb))
176 err = macvlan_broadcast_one(
177 nskb, vlan, eth,
178 mode == MACVLAN_MODE_BRIDGE);
179 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
180 err == NET_RX_SUCCESS, 1);
181 }
182 }
183}
184
185/* called under rcu_read_lock() from netif_receive_skb */
186static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
187{
188 struct macvlan_port *port;
189 struct sk_buff *skb = *pskb;
190 const struct ethhdr *eth = eth_hdr(skb);
191 const struct macvlan_dev *vlan;
192 const struct macvlan_dev *src;
193 struct net_device *dev;
194 unsigned int len = 0;
195 int ret = NET_RX_DROP;
196
197 port = macvlan_port_get_rcu(skb->dev);
198 if (is_multicast_ether_addr(eth->h_dest)) {
199 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
200 if (!skb)
201 return RX_HANDLER_CONSUMED;
202 eth = eth_hdr(skb);
203 src = macvlan_hash_lookup(port, eth->h_source);
204 if (!src)
205 /* frame comes from an external address */
206 macvlan_broadcast(skb, port, NULL,
207 MACVLAN_MODE_PRIVATE |
208 MACVLAN_MODE_VEPA |
209 MACVLAN_MODE_PASSTHRU|
210 MACVLAN_MODE_BRIDGE);
211 else if (src->mode == MACVLAN_MODE_VEPA)
212 /* flood to everyone except source */
213 macvlan_broadcast(skb, port, src->dev,
214 MACVLAN_MODE_VEPA |
215 MACVLAN_MODE_BRIDGE);
216 else if (src->mode == MACVLAN_MODE_BRIDGE)
217 /*
218 * flood only to VEPA ports, bridge ports
219 * already saw the frame on the way out.
220 */
221 macvlan_broadcast(skb, port, src->dev,
222 MACVLAN_MODE_VEPA);
223 else {
224 /* forward to original port. */
225 vlan = src;
226 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
227 goto out;
228 }
229
230 return RX_HANDLER_PASS;
231 }
232
233 if (port->passthru)
234 vlan = list_first_or_null_rcu(&port->vlans,
235 struct macvlan_dev, list);
236 else
237 vlan = macvlan_hash_lookup(port, eth->h_dest);
238 if (vlan == NULL)
239 return RX_HANDLER_PASS;
240
241 dev = vlan->dev;
242 if (unlikely(!(dev->flags & IFF_UP))) {
243 kfree_skb(skb);
244 return RX_HANDLER_CONSUMED;
245 }
246 len = skb->len + ETH_HLEN;
247 skb = skb_share_check(skb, GFP_ATOMIC);
248 if (!skb)
249 goto out;
250
251 skb->dev = dev;
252 skb->pkt_type = PACKET_HOST;
253
254 ret = netif_rx(skb);
255
256out:
257 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
258 return RX_HANDLER_CONSUMED;
259}
260
261static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
262{
263 const struct macvlan_dev *vlan = netdev_priv(dev);
264 const struct macvlan_port *port = vlan->port;
265 const struct macvlan_dev *dest;
266
267 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
268 const struct ethhdr *eth = (void *)skb->data;
269
270 /* send to other bridge ports directly */
271 if (is_multicast_ether_addr(eth->h_dest)) {
272 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
273 goto xmit_world;
274 }
275
276 dest = macvlan_hash_lookup(port, eth->h_dest);
277 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
278 /* send to lowerdev first for its network taps */
279 dev_forward_skb(vlan->lowerdev, skb);
280
281 return NET_XMIT_SUCCESS;
282 }
283 }
284
285xmit_world:
286 skb->dev = vlan->lowerdev;
287 return dev_queue_xmit(skb);
288}
289
290static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
291 struct net_device *dev)
292{
293 unsigned int len = skb->len;
294 int ret;
295 const struct macvlan_dev *vlan = netdev_priv(dev);
296
297 if (vlan->fwd_priv) {
298 skb->dev = vlan->lowerdev;
299 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
300 } else {
301 ret = macvlan_queue_xmit(skb, dev);
302 }
303
304 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
305 struct vlan_pcpu_stats *pcpu_stats;
306
307 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
308 u64_stats_update_begin(&pcpu_stats->syncp);
309 pcpu_stats->tx_packets++;
310 pcpu_stats->tx_bytes += len;
311 u64_stats_update_end(&pcpu_stats->syncp);
312 } else {
313 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
314 }
315 return ret;
316}
317
318static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
319 unsigned short type, const void *daddr,
320 const void *saddr, unsigned len)
321{
322 const struct macvlan_dev *vlan = netdev_priv(dev);
323 struct net_device *lowerdev = vlan->lowerdev;
324
325 return dev_hard_header(skb, lowerdev, type, daddr,
326 saddr ? : dev->dev_addr, len);
327}
328
329static const struct header_ops macvlan_hard_header_ops = {
330 .create = macvlan_hard_header,
331 .rebuild = eth_rebuild_header,
332 .parse = eth_header_parse,
333 .cache = eth_header_cache,
334 .cache_update = eth_header_cache_update,
335};
336
337static struct rtnl_link_ops macvlan_link_ops;
338
339static int macvlan_open(struct net_device *dev)
340{
341 struct macvlan_dev *vlan = netdev_priv(dev);
342 struct net_device *lowerdev = vlan->lowerdev;
343 int err;
344
345 if (vlan->port->passthru) {
346 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
347 err = dev_set_promiscuity(lowerdev, 1);
348 if (err < 0)
349 goto out;
350 }
351 goto hash_add;
352 }
353
354 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
355 dev->rtnl_link_ops == &macvlan_link_ops) {
356 vlan->fwd_priv =
357 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
358
359 /* If we get a NULL pointer back, or if we get an error
360 * then we should just fall through to the non accelerated path
361 */
362 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
363 vlan->fwd_priv = NULL;
364 } else
365 return 0;
366 }
367
368 err = -EBUSY;
369 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
370 goto out;
371
372 err = dev_uc_add(lowerdev, dev->dev_addr);
373 if (err < 0)
374 goto out;
375 if (dev->flags & IFF_ALLMULTI) {
376 err = dev_set_allmulti(lowerdev, 1);
377 if (err < 0)
378 goto del_unicast;
379 }
380
381hash_add:
382 macvlan_hash_add(vlan);
383 return 0;
384
385del_unicast:
386 dev_uc_del(lowerdev, dev->dev_addr);
387out:
388 if (vlan->fwd_priv) {
389 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
390 vlan->fwd_priv);
391 vlan->fwd_priv = NULL;
392 }
393 return err;
394}
395
396static int macvlan_stop(struct net_device *dev)
397{
398 struct macvlan_dev *vlan = netdev_priv(dev);
399 struct net_device *lowerdev = vlan->lowerdev;
400
401 if (vlan->fwd_priv) {
402 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
403 vlan->fwd_priv);
404 vlan->fwd_priv = NULL;
405 return 0;
406 }
407
408 dev_uc_unsync(lowerdev, dev);
409 dev_mc_unsync(lowerdev, dev);
410
411 if (vlan->port->passthru) {
412 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
413 dev_set_promiscuity(lowerdev, -1);
414 goto hash_del;
415 }
416
417 if (dev->flags & IFF_ALLMULTI)
418 dev_set_allmulti(lowerdev, -1);
419
420 dev_uc_del(lowerdev, dev->dev_addr);
421
422hash_del:
423 macvlan_hash_del(vlan, !dev->dismantle);
424 return 0;
425}
426
427static int macvlan_set_mac_address(struct net_device *dev, void *p)
428{
429 struct macvlan_dev *vlan = netdev_priv(dev);
430 struct net_device *lowerdev = vlan->lowerdev;
431 struct sockaddr *addr = p;
432 int err;
433
434 if (!is_valid_ether_addr(addr->sa_data))
435 return -EADDRNOTAVAIL;
436
437 if (!(dev->flags & IFF_UP)) {
438 /* Just copy in the new address */
439 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
440 } else {
441 /* Rehash and update the device filters */
442 if (macvlan_addr_busy(vlan->port, addr->sa_data))
443 return -EBUSY;
444
445 err = dev_uc_add(lowerdev, addr->sa_data);
446 if (err)
447 return err;
448
449 dev_uc_del(lowerdev, dev->dev_addr);
450
451 macvlan_hash_change_addr(vlan, addr->sa_data);
452 }
453 return 0;
454}
455
456static void macvlan_change_rx_flags(struct net_device *dev, int change)
457{
458 struct macvlan_dev *vlan = netdev_priv(dev);
459 struct net_device *lowerdev = vlan->lowerdev;
460
461 if (dev->flags & IFF_UP) {
462 if (change & IFF_ALLMULTI)
463 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
464 }
465}
466
467static void macvlan_set_mac_lists(struct net_device *dev)
468{
469 struct macvlan_dev *vlan = netdev_priv(dev);
470
471 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
472 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
473 } else {
474 struct netdev_hw_addr *ha;
475 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
476
477 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
478 netdev_for_each_mc_addr(ha, dev) {
479 __set_bit(mc_hash(vlan, ha->addr), filter);
480 }
481
482 __set_bit(mc_hash(vlan, dev->broadcast), filter);
483
484 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
485 }
486 dev_uc_sync(vlan->lowerdev, dev);
487 dev_mc_sync(vlan->lowerdev, dev);
488}
489
490static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
491{
492 struct macvlan_dev *vlan = netdev_priv(dev);
493
494 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
495 return -EINVAL;
496 dev->mtu = new_mtu;
497 return 0;
498}
499
500/*
501 * macvlan network devices have devices nesting below it and are a special
502 * "super class" of normal network devices; split their locks off into a
503 * separate class since they always nest.
504 */
505static struct lock_class_key macvlan_netdev_xmit_lock_key;
506static struct lock_class_key macvlan_netdev_addr_lock_key;
507
508#define ALWAYS_ON_FEATURES \
509 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
510
511#define MACVLAN_FEATURES \
512 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
513 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
514 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
515 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
516
517#define MACVLAN_STATE_MASK \
518 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
519
520static int macvlan_get_nest_level(struct net_device *dev)
521{
522 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
523}
524
525static void macvlan_set_lockdep_class_one(struct net_device *dev,
526 struct netdev_queue *txq,
527 void *_unused)
528{
529 lockdep_set_class(&txq->_xmit_lock,
530 &macvlan_netdev_xmit_lock_key);
531}
532
533static void macvlan_set_lockdep_class(struct net_device *dev)
534{
535 lockdep_set_class_and_subclass(&dev->addr_list_lock,
536 &macvlan_netdev_addr_lock_key,
537 macvlan_get_nest_level(dev));
538 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
539}
540
541static int macvlan_init(struct net_device *dev)
542{
543 struct macvlan_dev *vlan = netdev_priv(dev);
544 const struct net_device *lowerdev = vlan->lowerdev;
545
546 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
547 (lowerdev->state & MACVLAN_STATE_MASK);
548 dev->features = lowerdev->features & MACVLAN_FEATURES;
549 dev->features |= ALWAYS_ON_FEATURES;
550 dev->gso_max_size = lowerdev->gso_max_size;
551 dev->iflink = lowerdev->ifindex;
552 dev->hard_header_len = lowerdev->hard_header_len;
553
554 macvlan_set_lockdep_class(dev);
555
556 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
557 if (!vlan->pcpu_stats)
558 return -ENOMEM;
559
560 return 0;
561}
562
563static void macvlan_uninit(struct net_device *dev)
564{
565 struct macvlan_dev *vlan = netdev_priv(dev);
566 struct macvlan_port *port = vlan->port;
567
568 free_percpu(vlan->pcpu_stats);
569
570 port->count -= 1;
571 if (!port->count)
572 macvlan_port_destroy(port->dev);
573}
574
575static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
576 struct rtnl_link_stats64 *stats)
577{
578 struct macvlan_dev *vlan = netdev_priv(dev);
579
580 if (vlan->pcpu_stats) {
581 struct vlan_pcpu_stats *p;
582 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
583 u32 rx_errors = 0, tx_dropped = 0;
584 unsigned int start;
585 int i;
586
587 for_each_possible_cpu(i) {
588 p = per_cpu_ptr(vlan->pcpu_stats, i);
589 do {
590 start = u64_stats_fetch_begin_irq(&p->syncp);
591 rx_packets = p->rx_packets;
592 rx_bytes = p->rx_bytes;
593 rx_multicast = p->rx_multicast;
594 tx_packets = p->tx_packets;
595 tx_bytes = p->tx_bytes;
596 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
597
598 stats->rx_packets += rx_packets;
599 stats->rx_bytes += rx_bytes;
600 stats->multicast += rx_multicast;
601 stats->tx_packets += tx_packets;
602 stats->tx_bytes += tx_bytes;
603 /* rx_errors & tx_dropped are u32, updated
604 * without syncp protection.
605 */
606 rx_errors += p->rx_errors;
607 tx_dropped += p->tx_dropped;
608 }
609 stats->rx_errors = rx_errors;
610 stats->rx_dropped = rx_errors;
611 stats->tx_dropped = tx_dropped;
612 }
613 return stats;
614}
615
616static int macvlan_vlan_rx_add_vid(struct net_device *dev,
617 __be16 proto, u16 vid)
618{
619 struct macvlan_dev *vlan = netdev_priv(dev);
620 struct net_device *lowerdev = vlan->lowerdev;
621
622 return vlan_vid_add(lowerdev, proto, vid);
623}
624
625static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
626 __be16 proto, u16 vid)
627{
628 struct macvlan_dev *vlan = netdev_priv(dev);
629 struct net_device *lowerdev = vlan->lowerdev;
630
631 vlan_vid_del(lowerdev, proto, vid);
632 return 0;
633}
634
635static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
636 struct net_device *dev,
637 const unsigned char *addr,
638 u16 flags)
639{
640 struct macvlan_dev *vlan = netdev_priv(dev);
641 int err = -EINVAL;
642
643 if (!vlan->port->passthru)
644 return -EOPNOTSUPP;
645
646 if (flags & NLM_F_REPLACE)
647 return -EOPNOTSUPP;
648
649 if (is_unicast_ether_addr(addr))
650 err = dev_uc_add_excl(dev, addr);
651 else if (is_multicast_ether_addr(addr))
652 err = dev_mc_add_excl(dev, addr);
653
654 return err;
655}
656
657static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
658 struct net_device *dev,
659 const unsigned char *addr)
660{
661 struct macvlan_dev *vlan = netdev_priv(dev);
662 int err = -EINVAL;
663
664 if (!vlan->port->passthru)
665 return -EOPNOTSUPP;
666
667 if (is_unicast_ether_addr(addr))
668 err = dev_uc_del(dev, addr);
669 else if (is_multicast_ether_addr(addr))
670 err = dev_mc_del(dev, addr);
671
672 return err;
673}
674
675static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
676 struct ethtool_drvinfo *drvinfo)
677{
678 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
679 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
680}
681
682static int macvlan_ethtool_get_settings(struct net_device *dev,
683 struct ethtool_cmd *cmd)
684{
685 const struct macvlan_dev *vlan = netdev_priv(dev);
686
687 return __ethtool_get_settings(vlan->lowerdev, cmd);
688}
689
690static netdev_features_t macvlan_fix_features(struct net_device *dev,
691 netdev_features_t features)
692{
693 struct macvlan_dev *vlan = netdev_priv(dev);
694 netdev_features_t mask;
695
696 features |= NETIF_F_ALL_FOR_ALL;
697 features &= (vlan->set_features | ~MACVLAN_FEATURES);
698 mask = features;
699
700 features = netdev_increment_features(vlan->lowerdev->features,
701 features,
702 mask);
703 features |= ALWAYS_ON_FEATURES;
704
705 return features;
706}
707
708static const struct ethtool_ops macvlan_ethtool_ops = {
709 .get_link = ethtool_op_get_link,
710 .get_settings = macvlan_ethtool_get_settings,
711 .get_drvinfo = macvlan_ethtool_get_drvinfo,
712};
713
714static const struct net_device_ops macvlan_netdev_ops = {
715 .ndo_init = macvlan_init,
716 .ndo_uninit = macvlan_uninit,
717 .ndo_open = macvlan_open,
718 .ndo_stop = macvlan_stop,
719 .ndo_start_xmit = macvlan_start_xmit,
720 .ndo_change_mtu = macvlan_change_mtu,
721 .ndo_fix_features = macvlan_fix_features,
722 .ndo_change_rx_flags = macvlan_change_rx_flags,
723 .ndo_set_mac_address = macvlan_set_mac_address,
724 .ndo_set_rx_mode = macvlan_set_mac_lists,
725 .ndo_get_stats64 = macvlan_dev_get_stats64,
726 .ndo_validate_addr = eth_validate_addr,
727 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
728 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
729 .ndo_fdb_add = macvlan_fdb_add,
730 .ndo_fdb_del = macvlan_fdb_del,
731 .ndo_fdb_dump = ndo_dflt_fdb_dump,
732 .ndo_get_lock_subclass = macvlan_get_nest_level,
733};
734
735void macvlan_common_setup(struct net_device *dev)
736{
737 ether_setup(dev);
738
739 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
740 dev->priv_flags |= IFF_UNICAST_FLT;
741 dev->netdev_ops = &macvlan_netdev_ops;
742 dev->destructor = free_netdev;
743 dev->header_ops = &macvlan_hard_header_ops;
744 dev->ethtool_ops = &macvlan_ethtool_ops;
745}
746EXPORT_SYMBOL_GPL(macvlan_common_setup);
747
748static void macvlan_setup(struct net_device *dev)
749{
750 macvlan_common_setup(dev);
751 dev->tx_queue_len = 0;
752}
753
754static int macvlan_port_create(struct net_device *dev)
755{
756 struct macvlan_port *port;
757 unsigned int i;
758 int err;
759
760 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
761 return -EINVAL;
762
763 port = kzalloc(sizeof(*port), GFP_KERNEL);
764 if (port == NULL)
765 return -ENOMEM;
766
767 port->passthru = false;
768 port->dev = dev;
769 INIT_LIST_HEAD(&port->vlans);
770 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
771 INIT_HLIST_HEAD(&port->vlan_hash[i]);
772
773 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
774 if (err)
775 kfree(port);
776 else
777 dev->priv_flags |= IFF_MACVLAN_PORT;
778 return err;
779}
780
781static void macvlan_port_destroy(struct net_device *dev)
782{
783 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
784
785 dev->priv_flags &= ~IFF_MACVLAN_PORT;
786 netdev_rx_handler_unregister(dev);
787 kfree_rcu(port, rcu);
788}
789
790static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
791{
792 if (tb[IFLA_ADDRESS]) {
793 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
794 return -EINVAL;
795 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
796 return -EADDRNOTAVAIL;
797 }
798
799 if (data && data[IFLA_MACVLAN_FLAGS] &&
800 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
801 return -EINVAL;
802
803 if (data && data[IFLA_MACVLAN_MODE]) {
804 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
805 case MACVLAN_MODE_PRIVATE:
806 case MACVLAN_MODE_VEPA:
807 case MACVLAN_MODE_BRIDGE:
808 case MACVLAN_MODE_PASSTHRU:
809 break;
810 default:
811 return -EINVAL;
812 }
813 }
814 return 0;
815}
816
817int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
818 struct nlattr *tb[], struct nlattr *data[])
819{
820 struct macvlan_dev *vlan = netdev_priv(dev);
821 struct macvlan_port *port;
822 struct net_device *lowerdev;
823 int err;
824
825 if (!tb[IFLA_LINK])
826 return -EINVAL;
827
828 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
829 if (lowerdev == NULL)
830 return -ENODEV;
831
832 /* When creating macvlans or macvtaps on top of other macvlans - use
833 * the real device as the lowerdev.
834 */
835 if (netif_is_macvlan(lowerdev))
836 lowerdev = macvlan_dev_real_dev(lowerdev);
837
838 if (!tb[IFLA_MTU])
839 dev->mtu = lowerdev->mtu;
840 else if (dev->mtu > lowerdev->mtu)
841 return -EINVAL;
842
843 if (!tb[IFLA_ADDRESS])
844 eth_hw_addr_random(dev);
845
846 if (!macvlan_port_exists(lowerdev)) {
847 err = macvlan_port_create(lowerdev);
848 if (err < 0)
849 return err;
850 }
851 port = macvlan_port_get_rtnl(lowerdev);
852
853 /* Only 1 macvlan device can be created in passthru mode */
854 if (port->passthru)
855 return -EINVAL;
856
857 vlan->lowerdev = lowerdev;
858 vlan->dev = dev;
859 vlan->port = port;
860 vlan->set_features = MACVLAN_FEATURES;
861 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
862
863 vlan->mode = MACVLAN_MODE_VEPA;
864 if (data && data[IFLA_MACVLAN_MODE])
865 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
866
867 if (data && data[IFLA_MACVLAN_FLAGS])
868 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
869
870 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
871 if (port->count)
872 return -EINVAL;
873 port->passthru = true;
874 eth_hw_addr_inherit(dev, lowerdev);
875 }
876
877 port->count += 1;
878 err = register_netdevice(dev);
879 if (err < 0)
880 goto destroy_port;
881
882 dev->priv_flags |= IFF_MACVLAN;
883 err = netdev_upper_dev_link(lowerdev, dev);
884 if (err)
885 goto unregister_netdev;
886
887 list_add_tail_rcu(&vlan->list, &port->vlans);
888 netif_stacked_transfer_operstate(lowerdev, dev);
889
890 return 0;
891
892unregister_netdev:
893 unregister_netdevice(dev);
894destroy_port:
895 port->count -= 1;
896 if (!port->count)
897 macvlan_port_destroy(lowerdev);
898
899 return err;
900}
901EXPORT_SYMBOL_GPL(macvlan_common_newlink);
902
903static int macvlan_newlink(struct net *src_net, struct net_device *dev,
904 struct nlattr *tb[], struct nlattr *data[])
905{
906 return macvlan_common_newlink(src_net, dev, tb, data);
907}
908
909void macvlan_dellink(struct net_device *dev, struct list_head *head)
910{
911 struct macvlan_dev *vlan = netdev_priv(dev);
912
913 list_del_rcu(&vlan->list);
914 unregister_netdevice_queue(dev, head);
915 netdev_upper_dev_unlink(vlan->lowerdev, dev);
916}
917EXPORT_SYMBOL_GPL(macvlan_dellink);
918
919static int macvlan_changelink(struct net_device *dev,
920 struct nlattr *tb[], struct nlattr *data[])
921{
922 struct macvlan_dev *vlan = netdev_priv(dev);
923 enum macvlan_mode mode;
924 bool set_mode = false;
925
926 /* Validate mode, but don't set yet: setting flags may fail. */
927 if (data && data[IFLA_MACVLAN_MODE]) {
928 set_mode = true;
929 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
930 /* Passthrough mode can't be set or cleared dynamically */
931 if ((mode == MACVLAN_MODE_PASSTHRU) !=
932 (vlan->mode == MACVLAN_MODE_PASSTHRU))
933 return -EINVAL;
934 }
935
936 if (data && data[IFLA_MACVLAN_FLAGS]) {
937 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
938 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
939 if (vlan->port->passthru && promisc) {
940 int err;
941
942 if (flags & MACVLAN_FLAG_NOPROMISC)
943 err = dev_set_promiscuity(vlan->lowerdev, -1);
944 else
945 err = dev_set_promiscuity(vlan->lowerdev, 1);
946 if (err < 0)
947 return err;
948 }
949 vlan->flags = flags;
950 }
951 if (set_mode)
952 vlan->mode = mode;
953 return 0;
954}
955
956static size_t macvlan_get_size(const struct net_device *dev)
957{
958 return (0
959 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
960 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
961 );
962}
963
964static int macvlan_fill_info(struct sk_buff *skb,
965 const struct net_device *dev)
966{
967 struct macvlan_dev *vlan = netdev_priv(dev);
968
969 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
970 goto nla_put_failure;
971 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
972 goto nla_put_failure;
973 return 0;
974
975nla_put_failure:
976 return -EMSGSIZE;
977}
978
979static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
980 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
981 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
982};
983
984int macvlan_link_register(struct rtnl_link_ops *ops)
985{
986 /* common fields */
987 ops->priv_size = sizeof(struct macvlan_dev);
988 ops->validate = macvlan_validate;
989 ops->maxtype = IFLA_MACVLAN_MAX;
990 ops->policy = macvlan_policy;
991 ops->changelink = macvlan_changelink;
992 ops->get_size = macvlan_get_size;
993 ops->fill_info = macvlan_fill_info;
994
995 return rtnl_link_register(ops);
996};
997EXPORT_SYMBOL_GPL(macvlan_link_register);
998
999static struct rtnl_link_ops macvlan_link_ops = {
1000 .kind = "macvlan",
1001 .setup = macvlan_setup,
1002 .newlink = macvlan_newlink,
1003 .dellink = macvlan_dellink,
1004};
1005
1006static int macvlan_device_event(struct notifier_block *unused,
1007 unsigned long event, void *ptr)
1008{
1009 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1010 struct macvlan_dev *vlan, *next;
1011 struct macvlan_port *port;
1012 LIST_HEAD(list_kill);
1013
1014 if (!macvlan_port_exists(dev))
1015 return NOTIFY_DONE;
1016
1017 port = macvlan_port_get_rtnl(dev);
1018
1019 switch (event) {
1020 case NETDEV_CHANGE:
1021 list_for_each_entry(vlan, &port->vlans, list)
1022 netif_stacked_transfer_operstate(vlan->lowerdev,
1023 vlan->dev);
1024 break;
1025 case NETDEV_FEAT_CHANGE:
1026 list_for_each_entry(vlan, &port->vlans, list) {
1027 vlan->dev->gso_max_size = dev->gso_max_size;
1028 netdev_update_features(vlan->dev);
1029 }
1030 break;
1031 case NETDEV_UNREGISTER:
1032 /* twiddle thumbs on netns device moves */
1033 if (dev->reg_state != NETREG_UNREGISTERING)
1034 break;
1035
1036 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1037 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1038 unregister_netdevice_many(&list_kill);
1039 list_del(&list_kill);
1040 break;
1041 case NETDEV_PRE_TYPE_CHANGE:
1042 /* Forbid underlaying device to change its type. */
1043 return NOTIFY_BAD;
1044 }
1045 return NOTIFY_DONE;
1046}
1047
1048static struct notifier_block macvlan_notifier_block __read_mostly = {
1049 .notifier_call = macvlan_device_event,
1050};
1051
1052static int __init macvlan_init_module(void)
1053{
1054 int err;
1055
1056 register_netdevice_notifier(&macvlan_notifier_block);
1057
1058 err = macvlan_link_register(&macvlan_link_ops);
1059 if (err < 0)
1060 goto err1;
1061 return 0;
1062err1:
1063 unregister_netdevice_notifier(&macvlan_notifier_block);
1064 return err;
1065}
1066
1067static void __exit macvlan_cleanup_module(void)
1068{
1069 rtnl_link_unregister(&macvlan_link_ops);
1070 unregister_netdevice_notifier(&macvlan_notifier_block);
1071}
1072
1073module_init(macvlan_init_module);
1074module_exit(macvlan_cleanup_module);
1075
1076MODULE_LICENSE("GPL");
1077MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1078MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1079MODULE_ALIAS_RTNL_LINK("macvlan");
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 <linux/hash.h>
33#include <linux/workqueue.h>
34#include <net/rtnetlink.h>
35#include <net/xfrm.h>
36#include <linux/netpoll.h>
37
38#define MACVLAN_HASH_BITS 8
39#define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
40#define MACVLAN_BC_QUEUE_LEN 1000
41
42struct macvlan_port {
43 struct net_device *dev;
44 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
45 struct list_head vlans;
46 struct rcu_head rcu;
47 struct sk_buff_head bc_queue;
48 struct work_struct bc_work;
49 bool passthru;
50 int count;
51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
52};
53
54struct macvlan_source_entry {
55 struct hlist_node hlist;
56 struct macvlan_dev *vlan;
57 unsigned char addr[6+2] __aligned(sizeof(u16));
58 struct rcu_head rcu;
59};
60
61struct macvlan_skb_cb {
62 const struct macvlan_dev *src;
63};
64
65#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
66
67static void macvlan_port_destroy(struct net_device *dev);
68
69/* Hash Ethernet address */
70static u32 macvlan_eth_hash(const unsigned char *addr)
71{
72 u64 value = get_unaligned((u64 *)addr);
73
74 /* only want 6 bytes */
75#ifdef __BIG_ENDIAN
76 value >>= 16;
77#else
78 value <<= 16;
79#endif
80 return hash_64(value, MACVLAN_HASH_BITS);
81}
82
83static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
84{
85 return rcu_dereference(dev->rx_handler_data);
86}
87
88static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
89{
90 return rtnl_dereference(dev->rx_handler_data);
91}
92
93#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
94
95static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
96 const unsigned char *addr)
97{
98 struct macvlan_dev *vlan;
99 u32 idx = macvlan_eth_hash(addr);
100
101 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
102 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
103 return vlan;
104 }
105 return NULL;
106}
107
108static struct macvlan_source_entry *macvlan_hash_lookup_source(
109 const struct macvlan_dev *vlan,
110 const unsigned char *addr)
111{
112 struct macvlan_source_entry *entry;
113 u32 idx = macvlan_eth_hash(addr);
114 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
115
116 hlist_for_each_entry_rcu(entry, h, hlist) {
117 if (ether_addr_equal_64bits(entry->addr, addr) &&
118 entry->vlan == vlan)
119 return entry;
120 }
121 return NULL;
122}
123
124static int macvlan_hash_add_source(struct macvlan_dev *vlan,
125 const unsigned char *addr)
126{
127 struct macvlan_port *port = vlan->port;
128 struct macvlan_source_entry *entry;
129 struct hlist_head *h;
130
131 entry = macvlan_hash_lookup_source(vlan, addr);
132 if (entry)
133 return 0;
134
135 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
136 if (!entry)
137 return -ENOMEM;
138
139 ether_addr_copy(entry->addr, addr);
140 entry->vlan = vlan;
141 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
142 hlist_add_head_rcu(&entry->hlist, h);
143 vlan->macaddr_count++;
144
145 return 0;
146}
147
148static void macvlan_hash_add(struct macvlan_dev *vlan)
149{
150 struct macvlan_port *port = vlan->port;
151 const unsigned char *addr = vlan->dev->dev_addr;
152 u32 idx = macvlan_eth_hash(addr);
153
154 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
155}
156
157static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
158{
159 hlist_del_rcu(&entry->hlist);
160 kfree_rcu(entry, rcu);
161}
162
163static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
164{
165 hlist_del_rcu(&vlan->hlist);
166 if (sync)
167 synchronize_rcu();
168}
169
170static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
171 const unsigned char *addr)
172{
173 macvlan_hash_del(vlan, true);
174 /* Now that we are unhashed it is safe to change the device
175 * address without confusing packet delivery.
176 */
177 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
178 macvlan_hash_add(vlan);
179}
180
181static int macvlan_addr_busy(const struct macvlan_port *port,
182 const unsigned char *addr)
183{
184 /* Test to see if the specified multicast address is
185 * currently in use by the underlying device or
186 * another macvlan.
187 */
188 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
189 return 1;
190
191 if (macvlan_hash_lookup(port, addr))
192 return 1;
193
194 return 0;
195}
196
197
198static int macvlan_broadcast_one(struct sk_buff *skb,
199 const struct macvlan_dev *vlan,
200 const struct ethhdr *eth, bool local)
201{
202 struct net_device *dev = vlan->dev;
203
204 if (local)
205 return __dev_forward_skb(dev, skb);
206
207 skb->dev = dev;
208 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
209 skb->pkt_type = PACKET_BROADCAST;
210 else
211 skb->pkt_type = PACKET_MULTICAST;
212
213 return 0;
214}
215
216static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
217{
218 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
219}
220
221
222static unsigned int mc_hash(const struct macvlan_dev *vlan,
223 const unsigned char *addr)
224{
225 u32 val = __get_unaligned_cpu32(addr + 2);
226
227 val ^= macvlan_hash_mix(vlan);
228 return hash_32(val, MACVLAN_MC_FILTER_BITS);
229}
230
231static void macvlan_broadcast(struct sk_buff *skb,
232 const struct macvlan_port *port,
233 struct net_device *src,
234 enum macvlan_mode mode)
235{
236 const struct ethhdr *eth = eth_hdr(skb);
237 const struct macvlan_dev *vlan;
238 struct sk_buff *nskb;
239 unsigned int i;
240 int err;
241 unsigned int hash;
242
243 if (skb->protocol == htons(ETH_P_PAUSE))
244 return;
245
246 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
247 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
248 if (vlan->dev == src || !(vlan->mode & mode))
249 continue;
250
251 hash = mc_hash(vlan, eth->h_dest);
252 if (!test_bit(hash, vlan->mc_filter))
253 continue;
254
255 err = NET_RX_DROP;
256 nskb = skb_clone(skb, GFP_ATOMIC);
257 if (likely(nskb))
258 err = macvlan_broadcast_one(
259 nskb, vlan, eth,
260 mode == MACVLAN_MODE_BRIDGE) ?:
261 netif_rx_ni(nskb);
262 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
263 err == NET_RX_SUCCESS, true);
264 }
265 }
266}
267
268static void macvlan_process_broadcast(struct work_struct *w)
269{
270 struct macvlan_port *port = container_of(w, struct macvlan_port,
271 bc_work);
272 struct sk_buff *skb;
273 struct sk_buff_head list;
274
275 __skb_queue_head_init(&list);
276
277 spin_lock_bh(&port->bc_queue.lock);
278 skb_queue_splice_tail_init(&port->bc_queue, &list);
279 spin_unlock_bh(&port->bc_queue.lock);
280
281 while ((skb = __skb_dequeue(&list))) {
282 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
283
284 rcu_read_lock();
285
286 if (!src)
287 /* frame comes from an external address */
288 macvlan_broadcast(skb, port, NULL,
289 MACVLAN_MODE_PRIVATE |
290 MACVLAN_MODE_VEPA |
291 MACVLAN_MODE_PASSTHRU|
292 MACVLAN_MODE_BRIDGE);
293 else if (src->mode == MACVLAN_MODE_VEPA)
294 /* flood to everyone except source */
295 macvlan_broadcast(skb, port, src->dev,
296 MACVLAN_MODE_VEPA |
297 MACVLAN_MODE_BRIDGE);
298 else
299 /*
300 * flood only to VEPA ports, bridge ports
301 * already saw the frame on the way out.
302 */
303 macvlan_broadcast(skb, port, src->dev,
304 MACVLAN_MODE_VEPA);
305
306 rcu_read_unlock();
307
308 kfree_skb(skb);
309 }
310}
311
312static void macvlan_broadcast_enqueue(struct macvlan_port *port,
313 struct sk_buff *skb)
314{
315 struct sk_buff *nskb;
316 int err = -ENOMEM;
317
318 nskb = skb_clone(skb, GFP_ATOMIC);
319 if (!nskb)
320 goto err;
321
322 spin_lock(&port->bc_queue.lock);
323 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
324 __skb_queue_tail(&port->bc_queue, nskb);
325 err = 0;
326 }
327 spin_unlock(&port->bc_queue.lock);
328
329 if (err)
330 goto free_nskb;
331
332 schedule_work(&port->bc_work);
333 return;
334
335free_nskb:
336 kfree_skb(nskb);
337err:
338 atomic_long_inc(&skb->dev->rx_dropped);
339}
340
341static void macvlan_flush_sources(struct macvlan_port *port,
342 struct macvlan_dev *vlan)
343{
344 int i;
345
346 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
347 struct hlist_node *h, *n;
348
349 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
350 struct macvlan_source_entry *entry;
351
352 entry = hlist_entry(h, struct macvlan_source_entry,
353 hlist);
354 if (entry->vlan == vlan)
355 macvlan_hash_del_source(entry);
356 }
357 }
358 vlan->macaddr_count = 0;
359}
360
361static void macvlan_forward_source_one(struct sk_buff *skb,
362 struct macvlan_dev *vlan)
363{
364 struct sk_buff *nskb;
365 struct net_device *dev;
366 int len;
367 int ret;
368
369 dev = vlan->dev;
370 if (unlikely(!(dev->flags & IFF_UP)))
371 return;
372
373 nskb = skb_clone(skb, GFP_ATOMIC);
374 if (!nskb)
375 return;
376
377 len = nskb->len + ETH_HLEN;
378 nskb->dev = dev;
379 nskb->pkt_type = PACKET_HOST;
380
381 ret = netif_rx(nskb);
382 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
383}
384
385static void macvlan_forward_source(struct sk_buff *skb,
386 struct macvlan_port *port,
387 const unsigned char *addr)
388{
389 struct macvlan_source_entry *entry;
390 u32 idx = macvlan_eth_hash(addr);
391 struct hlist_head *h = &port->vlan_source_hash[idx];
392
393 hlist_for_each_entry_rcu(entry, h, hlist) {
394 if (ether_addr_equal_64bits(entry->addr, addr))
395 if (entry->vlan->dev->flags & IFF_UP)
396 macvlan_forward_source_one(skb, entry->vlan);
397 }
398}
399
400/* called under rcu_read_lock() from netif_receive_skb */
401static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
402{
403 struct macvlan_port *port;
404 struct sk_buff *skb = *pskb;
405 const struct ethhdr *eth = eth_hdr(skb);
406 const struct macvlan_dev *vlan;
407 const struct macvlan_dev *src;
408 struct net_device *dev;
409 unsigned int len = 0;
410 int ret;
411 rx_handler_result_t handle_res;
412
413 port = macvlan_port_get_rcu(skb->dev);
414 if (is_multicast_ether_addr(eth->h_dest)) {
415 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
416 if (!skb)
417 return RX_HANDLER_CONSUMED;
418 *pskb = skb;
419 eth = eth_hdr(skb);
420 macvlan_forward_source(skb, port, eth->h_source);
421 src = macvlan_hash_lookup(port, eth->h_source);
422 if (src && src->mode != MACVLAN_MODE_VEPA &&
423 src->mode != MACVLAN_MODE_BRIDGE) {
424 /* forward to original port. */
425 vlan = src;
426 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
427 netif_rx(skb);
428 handle_res = RX_HANDLER_CONSUMED;
429 goto out;
430 }
431
432 MACVLAN_SKB_CB(skb)->src = src;
433 macvlan_broadcast_enqueue(port, skb);
434
435 return RX_HANDLER_PASS;
436 }
437
438 macvlan_forward_source(skb, port, eth->h_source);
439 if (port->passthru)
440 vlan = list_first_or_null_rcu(&port->vlans,
441 struct macvlan_dev, list);
442 else
443 vlan = macvlan_hash_lookup(port, eth->h_dest);
444 if (vlan == NULL)
445 return RX_HANDLER_PASS;
446
447 dev = vlan->dev;
448 if (unlikely(!(dev->flags & IFF_UP))) {
449 kfree_skb(skb);
450 return RX_HANDLER_CONSUMED;
451 }
452 len = skb->len + ETH_HLEN;
453 skb = skb_share_check(skb, GFP_ATOMIC);
454 if (!skb) {
455 ret = NET_RX_DROP;
456 handle_res = RX_HANDLER_CONSUMED;
457 goto out;
458 }
459
460 *pskb = skb;
461 skb->dev = dev;
462 skb->pkt_type = PACKET_HOST;
463
464 ret = NET_RX_SUCCESS;
465 handle_res = RX_HANDLER_ANOTHER;
466out:
467 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
468 return handle_res;
469}
470
471static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
472{
473 const struct macvlan_dev *vlan = netdev_priv(dev);
474 const struct macvlan_port *port = vlan->port;
475 const struct macvlan_dev *dest;
476
477 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
478 const struct ethhdr *eth = (void *)skb->data;
479
480 /* send to other bridge ports directly */
481 if (is_multicast_ether_addr(eth->h_dest)) {
482 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
483 goto xmit_world;
484 }
485
486 dest = macvlan_hash_lookup(port, eth->h_dest);
487 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
488 /* send to lowerdev first for its network taps */
489 dev_forward_skb(vlan->lowerdev, skb);
490
491 return NET_XMIT_SUCCESS;
492 }
493 }
494
495xmit_world:
496 skb->dev = vlan->lowerdev;
497 return dev_queue_xmit(skb);
498}
499
500static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
501{
502#ifdef CONFIG_NET_POLL_CONTROLLER
503 if (vlan->netpoll)
504 netpoll_send_skb(vlan->netpoll, skb);
505#else
506 BUG();
507#endif
508 return NETDEV_TX_OK;
509}
510
511static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
512 struct net_device *dev)
513{
514 unsigned int len = skb->len;
515 int ret;
516 struct macvlan_dev *vlan = netdev_priv(dev);
517
518 if (unlikely(netpoll_tx_running(dev)))
519 return macvlan_netpoll_send_skb(vlan, skb);
520
521 if (vlan->fwd_priv) {
522 skb->dev = vlan->lowerdev;
523 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
524 } else {
525 ret = macvlan_queue_xmit(skb, dev);
526 }
527
528 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
529 struct vlan_pcpu_stats *pcpu_stats;
530
531 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
532 u64_stats_update_begin(&pcpu_stats->syncp);
533 pcpu_stats->tx_packets++;
534 pcpu_stats->tx_bytes += len;
535 u64_stats_update_end(&pcpu_stats->syncp);
536 } else {
537 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
538 }
539 return ret;
540}
541
542static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
543 unsigned short type, const void *daddr,
544 const void *saddr, unsigned len)
545{
546 const struct macvlan_dev *vlan = netdev_priv(dev);
547 struct net_device *lowerdev = vlan->lowerdev;
548
549 return dev_hard_header(skb, lowerdev, type, daddr,
550 saddr ? : dev->dev_addr, len);
551}
552
553static const struct header_ops macvlan_hard_header_ops = {
554 .create = macvlan_hard_header,
555 .parse = eth_header_parse,
556 .cache = eth_header_cache,
557 .cache_update = eth_header_cache_update,
558};
559
560static struct rtnl_link_ops macvlan_link_ops;
561
562static int macvlan_open(struct net_device *dev)
563{
564 struct macvlan_dev *vlan = netdev_priv(dev);
565 struct net_device *lowerdev = vlan->lowerdev;
566 int err;
567
568 if (vlan->port->passthru) {
569 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
570 err = dev_set_promiscuity(lowerdev, 1);
571 if (err < 0)
572 goto out;
573 }
574 goto hash_add;
575 }
576
577 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
578 dev->rtnl_link_ops == &macvlan_link_ops) {
579 vlan->fwd_priv =
580 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
581
582 /* If we get a NULL pointer back, or if we get an error
583 * then we should just fall through to the non accelerated path
584 */
585 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
586 vlan->fwd_priv = NULL;
587 } else
588 return 0;
589 }
590
591 err = -EBUSY;
592 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
593 goto out;
594
595 err = dev_uc_add(lowerdev, dev->dev_addr);
596 if (err < 0)
597 goto out;
598 if (dev->flags & IFF_ALLMULTI) {
599 err = dev_set_allmulti(lowerdev, 1);
600 if (err < 0)
601 goto del_unicast;
602 }
603
604 if (dev->flags & IFF_PROMISC) {
605 err = dev_set_promiscuity(lowerdev, 1);
606 if (err < 0)
607 goto clear_multi;
608 }
609
610hash_add:
611 macvlan_hash_add(vlan);
612 return 0;
613
614clear_multi:
615 dev_set_allmulti(lowerdev, -1);
616del_unicast:
617 dev_uc_del(lowerdev, dev->dev_addr);
618out:
619 if (vlan->fwd_priv) {
620 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
621 vlan->fwd_priv);
622 vlan->fwd_priv = NULL;
623 }
624 return err;
625}
626
627static int macvlan_stop(struct net_device *dev)
628{
629 struct macvlan_dev *vlan = netdev_priv(dev);
630 struct net_device *lowerdev = vlan->lowerdev;
631
632 if (vlan->fwd_priv) {
633 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
634 vlan->fwd_priv);
635 vlan->fwd_priv = NULL;
636 return 0;
637 }
638
639 dev_uc_unsync(lowerdev, dev);
640 dev_mc_unsync(lowerdev, dev);
641
642 if (vlan->port->passthru) {
643 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
644 dev_set_promiscuity(lowerdev, -1);
645 goto hash_del;
646 }
647
648 if (dev->flags & IFF_ALLMULTI)
649 dev_set_allmulti(lowerdev, -1);
650
651 if (dev->flags & IFF_PROMISC)
652 dev_set_promiscuity(lowerdev, -1);
653
654 dev_uc_del(lowerdev, dev->dev_addr);
655
656hash_del:
657 macvlan_hash_del(vlan, !dev->dismantle);
658 return 0;
659}
660
661static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
662{
663 struct macvlan_dev *vlan = netdev_priv(dev);
664 struct net_device *lowerdev = vlan->lowerdev;
665 int err;
666
667 if (!(dev->flags & IFF_UP)) {
668 /* Just copy in the new address */
669 ether_addr_copy(dev->dev_addr, addr);
670 } else {
671 /* Rehash and update the device filters */
672 if (macvlan_addr_busy(vlan->port, addr))
673 return -EBUSY;
674
675 if (!vlan->port->passthru) {
676 err = dev_uc_add(lowerdev, addr);
677 if (err)
678 return err;
679
680 dev_uc_del(lowerdev, dev->dev_addr);
681 }
682
683 macvlan_hash_change_addr(vlan, addr);
684 }
685 return 0;
686}
687
688static int macvlan_set_mac_address(struct net_device *dev, void *p)
689{
690 struct macvlan_dev *vlan = netdev_priv(dev);
691 struct sockaddr *addr = p;
692
693 if (!is_valid_ether_addr(addr->sa_data))
694 return -EADDRNOTAVAIL;
695
696 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
697 dev_set_mac_address(vlan->lowerdev, addr);
698 return 0;
699 }
700
701 return macvlan_sync_address(dev, addr->sa_data);
702}
703
704static void macvlan_change_rx_flags(struct net_device *dev, int change)
705{
706 struct macvlan_dev *vlan = netdev_priv(dev);
707 struct net_device *lowerdev = vlan->lowerdev;
708
709 if (dev->flags & IFF_UP) {
710 if (change & IFF_ALLMULTI)
711 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
712 if (change & IFF_PROMISC)
713 dev_set_promiscuity(lowerdev,
714 dev->flags & IFF_PROMISC ? 1 : -1);
715
716 }
717}
718
719static void macvlan_set_mac_lists(struct net_device *dev)
720{
721 struct macvlan_dev *vlan = netdev_priv(dev);
722
723 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
724 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
725 } else {
726 struct netdev_hw_addr *ha;
727 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
728
729 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
730 netdev_for_each_mc_addr(ha, dev) {
731 __set_bit(mc_hash(vlan, ha->addr), filter);
732 }
733
734 __set_bit(mc_hash(vlan, dev->broadcast), filter);
735
736 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
737 }
738 dev_uc_sync(vlan->lowerdev, dev);
739 dev_mc_sync(vlan->lowerdev, dev);
740}
741
742static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
743{
744 struct macvlan_dev *vlan = netdev_priv(dev);
745
746 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
747 return -EINVAL;
748 dev->mtu = new_mtu;
749 return 0;
750}
751
752/*
753 * macvlan network devices have devices nesting below it and are a special
754 * "super class" of normal network devices; split their locks off into a
755 * separate class since they always nest.
756 */
757static struct lock_class_key macvlan_netdev_xmit_lock_key;
758static struct lock_class_key macvlan_netdev_addr_lock_key;
759
760#define ALWAYS_ON_FEATURES \
761 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
762 NETIF_F_GSO_ROBUST)
763
764#define MACVLAN_FEATURES \
765 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
766 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
767 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
768 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
769
770#define MACVLAN_STATE_MASK \
771 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
772
773static int macvlan_get_nest_level(struct net_device *dev)
774{
775 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
776}
777
778static void macvlan_set_lockdep_class_one(struct net_device *dev,
779 struct netdev_queue *txq,
780 void *_unused)
781{
782 lockdep_set_class(&txq->_xmit_lock,
783 &macvlan_netdev_xmit_lock_key);
784}
785
786static void macvlan_set_lockdep_class(struct net_device *dev)
787{
788 lockdep_set_class_and_subclass(&dev->addr_list_lock,
789 &macvlan_netdev_addr_lock_key,
790 macvlan_get_nest_level(dev));
791 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
792}
793
794static int macvlan_init(struct net_device *dev)
795{
796 struct macvlan_dev *vlan = netdev_priv(dev);
797 const struct net_device *lowerdev = vlan->lowerdev;
798
799 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
800 (lowerdev->state & MACVLAN_STATE_MASK);
801 dev->features = lowerdev->features & MACVLAN_FEATURES;
802 dev->features |= ALWAYS_ON_FEATURES;
803 dev->hw_features |= NETIF_F_LRO;
804 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
805 dev->gso_max_size = lowerdev->gso_max_size;
806 dev->gso_max_segs = lowerdev->gso_max_segs;
807 dev->hard_header_len = lowerdev->hard_header_len;
808
809 macvlan_set_lockdep_class(dev);
810
811 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
812 if (!vlan->pcpu_stats)
813 return -ENOMEM;
814
815 return 0;
816}
817
818static void macvlan_uninit(struct net_device *dev)
819{
820 struct macvlan_dev *vlan = netdev_priv(dev);
821 struct macvlan_port *port = vlan->port;
822
823 free_percpu(vlan->pcpu_stats);
824
825 macvlan_flush_sources(port, vlan);
826 port->count -= 1;
827 if (!port->count)
828 macvlan_port_destroy(port->dev);
829}
830
831static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
832 struct rtnl_link_stats64 *stats)
833{
834 struct macvlan_dev *vlan = netdev_priv(dev);
835
836 if (vlan->pcpu_stats) {
837 struct vlan_pcpu_stats *p;
838 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
839 u32 rx_errors = 0, tx_dropped = 0;
840 unsigned int start;
841 int i;
842
843 for_each_possible_cpu(i) {
844 p = per_cpu_ptr(vlan->pcpu_stats, i);
845 do {
846 start = u64_stats_fetch_begin_irq(&p->syncp);
847 rx_packets = p->rx_packets;
848 rx_bytes = p->rx_bytes;
849 rx_multicast = p->rx_multicast;
850 tx_packets = p->tx_packets;
851 tx_bytes = p->tx_bytes;
852 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
853
854 stats->rx_packets += rx_packets;
855 stats->rx_bytes += rx_bytes;
856 stats->multicast += rx_multicast;
857 stats->tx_packets += tx_packets;
858 stats->tx_bytes += tx_bytes;
859 /* rx_errors & tx_dropped are u32, updated
860 * without syncp protection.
861 */
862 rx_errors += p->rx_errors;
863 tx_dropped += p->tx_dropped;
864 }
865 stats->rx_errors = rx_errors;
866 stats->rx_dropped = rx_errors;
867 stats->tx_dropped = tx_dropped;
868 }
869 return stats;
870}
871
872static int macvlan_vlan_rx_add_vid(struct net_device *dev,
873 __be16 proto, u16 vid)
874{
875 struct macvlan_dev *vlan = netdev_priv(dev);
876 struct net_device *lowerdev = vlan->lowerdev;
877
878 return vlan_vid_add(lowerdev, proto, vid);
879}
880
881static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
882 __be16 proto, u16 vid)
883{
884 struct macvlan_dev *vlan = netdev_priv(dev);
885 struct net_device *lowerdev = vlan->lowerdev;
886
887 vlan_vid_del(lowerdev, proto, vid);
888 return 0;
889}
890
891static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
892 struct net_device *dev,
893 const unsigned char *addr, u16 vid,
894 u16 flags)
895{
896 struct macvlan_dev *vlan = netdev_priv(dev);
897 int err = -EINVAL;
898
899 /* Support unicast filter only on passthru devices.
900 * Multicast filter should be allowed on all devices.
901 */
902 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
903 return -EOPNOTSUPP;
904
905 if (flags & NLM_F_REPLACE)
906 return -EOPNOTSUPP;
907
908 if (is_unicast_ether_addr(addr))
909 err = dev_uc_add_excl(dev, addr);
910 else if (is_multicast_ether_addr(addr))
911 err = dev_mc_add_excl(dev, addr);
912
913 return err;
914}
915
916static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
917 struct net_device *dev,
918 const unsigned char *addr, u16 vid)
919{
920 struct macvlan_dev *vlan = netdev_priv(dev);
921 int err = -EINVAL;
922
923 /* Support unicast filter only on passthru devices.
924 * Multicast filter should be allowed on all devices.
925 */
926 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
927 return -EOPNOTSUPP;
928
929 if (is_unicast_ether_addr(addr))
930 err = dev_uc_del(dev, addr);
931 else if (is_multicast_ether_addr(addr))
932 err = dev_mc_del(dev, addr);
933
934 return err;
935}
936
937static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
938 struct ethtool_drvinfo *drvinfo)
939{
940 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
941 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
942}
943
944static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
945 struct ethtool_link_ksettings *cmd)
946{
947 const struct macvlan_dev *vlan = netdev_priv(dev);
948
949 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
950}
951
952static netdev_features_t macvlan_fix_features(struct net_device *dev,
953 netdev_features_t features)
954{
955 struct macvlan_dev *vlan = netdev_priv(dev);
956 netdev_features_t lowerdev_features = vlan->lowerdev->features;
957 netdev_features_t mask;
958
959 features |= NETIF_F_ALL_FOR_ALL;
960 features &= (vlan->set_features | ~MACVLAN_FEATURES);
961 mask = features;
962
963 lowerdev_features &= (features | ~NETIF_F_LRO);
964 features = netdev_increment_features(lowerdev_features, features, mask);
965 features |= ALWAYS_ON_FEATURES;
966 features &= ~NETIF_F_NETNS_LOCAL;
967
968 return features;
969}
970
971#ifdef CONFIG_NET_POLL_CONTROLLER
972static void macvlan_dev_poll_controller(struct net_device *dev)
973{
974 return;
975}
976
977static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
978{
979 struct macvlan_dev *vlan = netdev_priv(dev);
980 struct net_device *real_dev = vlan->lowerdev;
981 struct netpoll *netpoll;
982 int err = 0;
983
984 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
985 err = -ENOMEM;
986 if (!netpoll)
987 goto out;
988
989 err = __netpoll_setup(netpoll, real_dev);
990 if (err) {
991 kfree(netpoll);
992 goto out;
993 }
994
995 vlan->netpoll = netpoll;
996
997out:
998 return err;
999}
1000
1001static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1002{
1003 struct macvlan_dev *vlan = netdev_priv(dev);
1004 struct netpoll *netpoll = vlan->netpoll;
1005
1006 if (!netpoll)
1007 return;
1008
1009 vlan->netpoll = NULL;
1010
1011 __netpoll_free_async(netpoll);
1012}
1013#endif /* CONFIG_NET_POLL_CONTROLLER */
1014
1015static int macvlan_dev_get_iflink(const struct net_device *dev)
1016{
1017 struct macvlan_dev *vlan = netdev_priv(dev);
1018
1019 return vlan->lowerdev->ifindex;
1020}
1021
1022static const struct ethtool_ops macvlan_ethtool_ops = {
1023 .get_link = ethtool_op_get_link,
1024 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1025 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1026};
1027
1028static const struct net_device_ops macvlan_netdev_ops = {
1029 .ndo_init = macvlan_init,
1030 .ndo_uninit = macvlan_uninit,
1031 .ndo_open = macvlan_open,
1032 .ndo_stop = macvlan_stop,
1033 .ndo_start_xmit = macvlan_start_xmit,
1034 .ndo_change_mtu = macvlan_change_mtu,
1035 .ndo_fix_features = macvlan_fix_features,
1036 .ndo_change_rx_flags = macvlan_change_rx_flags,
1037 .ndo_set_mac_address = macvlan_set_mac_address,
1038 .ndo_set_rx_mode = macvlan_set_mac_lists,
1039 .ndo_get_stats64 = macvlan_dev_get_stats64,
1040 .ndo_validate_addr = eth_validate_addr,
1041 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1042 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1043 .ndo_fdb_add = macvlan_fdb_add,
1044 .ndo_fdb_del = macvlan_fdb_del,
1045 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1046 .ndo_get_lock_subclass = macvlan_get_nest_level,
1047#ifdef CONFIG_NET_POLL_CONTROLLER
1048 .ndo_poll_controller = macvlan_dev_poll_controller,
1049 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1050 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1051#endif
1052 .ndo_get_iflink = macvlan_dev_get_iflink,
1053 .ndo_features_check = passthru_features_check,
1054};
1055
1056void macvlan_common_setup(struct net_device *dev)
1057{
1058 ether_setup(dev);
1059
1060 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1061 netif_keep_dst(dev);
1062 dev->priv_flags |= IFF_UNICAST_FLT;
1063 dev->netdev_ops = &macvlan_netdev_ops;
1064 dev->destructor = free_netdev;
1065 dev->header_ops = &macvlan_hard_header_ops;
1066 dev->ethtool_ops = &macvlan_ethtool_ops;
1067}
1068EXPORT_SYMBOL_GPL(macvlan_common_setup);
1069
1070static void macvlan_setup(struct net_device *dev)
1071{
1072 macvlan_common_setup(dev);
1073 dev->priv_flags |= IFF_NO_QUEUE;
1074}
1075
1076static int macvlan_port_create(struct net_device *dev)
1077{
1078 struct macvlan_port *port;
1079 unsigned int i;
1080 int err;
1081
1082 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1083 return -EINVAL;
1084
1085 if (netif_is_ipvlan_port(dev))
1086 return -EBUSY;
1087
1088 port = kzalloc(sizeof(*port), GFP_KERNEL);
1089 if (port == NULL)
1090 return -ENOMEM;
1091
1092 port->passthru = false;
1093 port->dev = dev;
1094 INIT_LIST_HEAD(&port->vlans);
1095 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1096 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1097 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1098 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1099
1100 skb_queue_head_init(&port->bc_queue);
1101 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1102
1103 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1104 if (err)
1105 kfree(port);
1106 else
1107 dev->priv_flags |= IFF_MACVLAN_PORT;
1108 return err;
1109}
1110
1111static void macvlan_port_destroy(struct net_device *dev)
1112{
1113 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1114
1115 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1116 netdev_rx_handler_unregister(dev);
1117
1118 /* After this point, no packet can schedule bc_work anymore,
1119 * but we need to cancel it and purge left skbs if any.
1120 */
1121 cancel_work_sync(&port->bc_work);
1122 __skb_queue_purge(&port->bc_queue);
1123
1124 kfree_rcu(port, rcu);
1125}
1126
1127static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1128{
1129 if (tb[IFLA_ADDRESS]) {
1130 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1131 return -EINVAL;
1132 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1133 return -EADDRNOTAVAIL;
1134 }
1135
1136 if (data && data[IFLA_MACVLAN_FLAGS] &&
1137 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1138 return -EINVAL;
1139
1140 if (data && data[IFLA_MACVLAN_MODE]) {
1141 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1142 case MACVLAN_MODE_PRIVATE:
1143 case MACVLAN_MODE_VEPA:
1144 case MACVLAN_MODE_BRIDGE:
1145 case MACVLAN_MODE_PASSTHRU:
1146 case MACVLAN_MODE_SOURCE:
1147 break;
1148 default:
1149 return -EINVAL;
1150 }
1151 }
1152
1153 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1154 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1155 case MACVLAN_MACADDR_ADD:
1156 case MACVLAN_MACADDR_DEL:
1157 case MACVLAN_MACADDR_FLUSH:
1158 case MACVLAN_MACADDR_SET:
1159 break;
1160 default:
1161 return -EINVAL;
1162 }
1163 }
1164
1165 if (data && data[IFLA_MACVLAN_MACADDR]) {
1166 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1167 return -EINVAL;
1168
1169 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1170 return -EADDRNOTAVAIL;
1171 }
1172
1173 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1174 return -EINVAL;
1175
1176 return 0;
1177}
1178
1179/**
1180 * reconfigure list of remote source mac address
1181 * (only for macvlan devices in source mode)
1182 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1183 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1184 */
1185static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1186 struct nlattr *data[])
1187{
1188 char *addr = NULL;
1189 int ret, rem, len;
1190 struct nlattr *nla, *head;
1191 struct macvlan_source_entry *entry;
1192
1193 if (data[IFLA_MACVLAN_MACADDR])
1194 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1195
1196 if (mode == MACVLAN_MACADDR_ADD) {
1197 if (!addr)
1198 return -EINVAL;
1199
1200 return macvlan_hash_add_source(vlan, addr);
1201
1202 } else if (mode == MACVLAN_MACADDR_DEL) {
1203 if (!addr)
1204 return -EINVAL;
1205
1206 entry = macvlan_hash_lookup_source(vlan, addr);
1207 if (entry) {
1208 macvlan_hash_del_source(entry);
1209 vlan->macaddr_count--;
1210 }
1211 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1212 macvlan_flush_sources(vlan->port, vlan);
1213 } else if (mode == MACVLAN_MACADDR_SET) {
1214 macvlan_flush_sources(vlan->port, vlan);
1215
1216 if (addr) {
1217 ret = macvlan_hash_add_source(vlan, addr);
1218 if (ret)
1219 return ret;
1220 }
1221
1222 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1223 return 0;
1224
1225 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1226 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1227
1228 nla_for_each_attr(nla, head, len, rem) {
1229 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1230 nla_len(nla) != ETH_ALEN)
1231 continue;
1232
1233 addr = nla_data(nla);
1234 ret = macvlan_hash_add_source(vlan, addr);
1235 if (ret)
1236 return ret;
1237 }
1238 } else {
1239 return -EINVAL;
1240 }
1241
1242 return 0;
1243}
1244
1245int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1246 struct nlattr *tb[], struct nlattr *data[])
1247{
1248 struct macvlan_dev *vlan = netdev_priv(dev);
1249 struct macvlan_port *port;
1250 struct net_device *lowerdev;
1251 int err;
1252 int macmode;
1253
1254 if (!tb[IFLA_LINK])
1255 return -EINVAL;
1256
1257 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1258 if (lowerdev == NULL)
1259 return -ENODEV;
1260
1261 /* When creating macvlans or macvtaps on top of other macvlans - use
1262 * the real device as the lowerdev.
1263 */
1264 if (netif_is_macvlan(lowerdev))
1265 lowerdev = macvlan_dev_real_dev(lowerdev);
1266
1267 if (!tb[IFLA_MTU])
1268 dev->mtu = lowerdev->mtu;
1269 else if (dev->mtu > lowerdev->mtu)
1270 return -EINVAL;
1271
1272 if (!tb[IFLA_ADDRESS])
1273 eth_hw_addr_random(dev);
1274
1275 if (!macvlan_port_exists(lowerdev)) {
1276 err = macvlan_port_create(lowerdev);
1277 if (err < 0)
1278 return err;
1279 }
1280 port = macvlan_port_get_rtnl(lowerdev);
1281
1282 /* Only 1 macvlan device can be created in passthru mode */
1283 if (port->passthru)
1284 return -EINVAL;
1285
1286 vlan->lowerdev = lowerdev;
1287 vlan->dev = dev;
1288 vlan->port = port;
1289 vlan->set_features = MACVLAN_FEATURES;
1290 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1291
1292 vlan->mode = MACVLAN_MODE_VEPA;
1293 if (data && data[IFLA_MACVLAN_MODE])
1294 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1295
1296 if (data && data[IFLA_MACVLAN_FLAGS])
1297 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1298
1299 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1300 if (port->count)
1301 return -EINVAL;
1302 port->passthru = true;
1303 eth_hw_addr_inherit(dev, lowerdev);
1304 }
1305
1306 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1307 if (vlan->mode != MACVLAN_MODE_SOURCE)
1308 return -EINVAL;
1309 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1310 err = macvlan_changelink_sources(vlan, macmode, data);
1311 if (err)
1312 return err;
1313 }
1314
1315 port->count += 1;
1316 err = register_netdevice(dev);
1317 if (err < 0)
1318 goto destroy_port;
1319
1320 dev->priv_flags |= IFF_MACVLAN;
1321 err = netdev_upper_dev_link(lowerdev, dev);
1322 if (err)
1323 goto unregister_netdev;
1324
1325 list_add_tail_rcu(&vlan->list, &port->vlans);
1326 netif_stacked_transfer_operstate(lowerdev, dev);
1327 linkwatch_fire_event(dev);
1328
1329 return 0;
1330
1331unregister_netdev:
1332 unregister_netdevice(dev);
1333destroy_port:
1334 port->count -= 1;
1335 if (!port->count)
1336 macvlan_port_destroy(lowerdev);
1337
1338 return err;
1339}
1340EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1341
1342static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1343 struct nlattr *tb[], struct nlattr *data[])
1344{
1345 return macvlan_common_newlink(src_net, dev, tb, data);
1346}
1347
1348void macvlan_dellink(struct net_device *dev, struct list_head *head)
1349{
1350 struct macvlan_dev *vlan = netdev_priv(dev);
1351
1352 if (vlan->mode == MACVLAN_MODE_SOURCE)
1353 macvlan_flush_sources(vlan->port, vlan);
1354 list_del_rcu(&vlan->list);
1355 unregister_netdevice_queue(dev, head);
1356 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1357}
1358EXPORT_SYMBOL_GPL(macvlan_dellink);
1359
1360static int macvlan_changelink(struct net_device *dev,
1361 struct nlattr *tb[], struct nlattr *data[])
1362{
1363 struct macvlan_dev *vlan = netdev_priv(dev);
1364 enum macvlan_mode mode;
1365 bool set_mode = false;
1366 enum macvlan_macaddr_mode macmode;
1367 int ret;
1368
1369 /* Validate mode, but don't set yet: setting flags may fail. */
1370 if (data && data[IFLA_MACVLAN_MODE]) {
1371 set_mode = true;
1372 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1373 /* Passthrough mode can't be set or cleared dynamically */
1374 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1375 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1376 return -EINVAL;
1377 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1378 vlan->mode != mode)
1379 macvlan_flush_sources(vlan->port, vlan);
1380 }
1381
1382 if (data && data[IFLA_MACVLAN_FLAGS]) {
1383 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1384 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1385 if (vlan->port->passthru && promisc) {
1386 int err;
1387
1388 if (flags & MACVLAN_FLAG_NOPROMISC)
1389 err = dev_set_promiscuity(vlan->lowerdev, -1);
1390 else
1391 err = dev_set_promiscuity(vlan->lowerdev, 1);
1392 if (err < 0)
1393 return err;
1394 }
1395 vlan->flags = flags;
1396 }
1397 if (set_mode)
1398 vlan->mode = mode;
1399 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1400 if (vlan->mode != MACVLAN_MODE_SOURCE)
1401 return -EINVAL;
1402 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1403 ret = macvlan_changelink_sources(vlan, macmode, data);
1404 if (ret)
1405 return ret;
1406 }
1407 return 0;
1408}
1409
1410static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1411{
1412 if (vlan->macaddr_count == 0)
1413 return 0;
1414 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1415 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1416}
1417
1418static size_t macvlan_get_size(const struct net_device *dev)
1419{
1420 struct macvlan_dev *vlan = netdev_priv(dev);
1421
1422 return (0
1423 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1424 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1425 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1426 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1427 );
1428}
1429
1430static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1431 const struct macvlan_dev *vlan,
1432 const int i)
1433{
1434 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1435 struct macvlan_source_entry *entry;
1436
1437 hlist_for_each_entry_rcu(entry, h, hlist) {
1438 if (entry->vlan != vlan)
1439 continue;
1440 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1441 return 1;
1442 }
1443 return 0;
1444}
1445
1446static int macvlan_fill_info(struct sk_buff *skb,
1447 const struct net_device *dev)
1448{
1449 struct macvlan_dev *vlan = netdev_priv(dev);
1450 int i;
1451 struct nlattr *nest;
1452
1453 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1454 goto nla_put_failure;
1455 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1456 goto nla_put_failure;
1457 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1458 goto nla_put_failure;
1459 if (vlan->macaddr_count > 0) {
1460 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1461 if (nest == NULL)
1462 goto nla_put_failure;
1463
1464 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1465 if (macvlan_fill_info_macaddr(skb, vlan, i))
1466 goto nla_put_failure;
1467 }
1468 nla_nest_end(skb, nest);
1469 }
1470 return 0;
1471
1472nla_put_failure:
1473 return -EMSGSIZE;
1474}
1475
1476static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1477 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1478 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1479 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1480 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1481 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1482 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1483};
1484
1485int macvlan_link_register(struct rtnl_link_ops *ops)
1486{
1487 /* common fields */
1488 ops->priv_size = sizeof(struct macvlan_dev);
1489 ops->validate = macvlan_validate;
1490 ops->maxtype = IFLA_MACVLAN_MAX;
1491 ops->policy = macvlan_policy;
1492 ops->changelink = macvlan_changelink;
1493 ops->get_size = macvlan_get_size;
1494 ops->fill_info = macvlan_fill_info;
1495
1496 return rtnl_link_register(ops);
1497};
1498EXPORT_SYMBOL_GPL(macvlan_link_register);
1499
1500static struct net *macvlan_get_link_net(const struct net_device *dev)
1501{
1502 return dev_net(macvlan_dev_real_dev(dev));
1503}
1504
1505static struct rtnl_link_ops macvlan_link_ops = {
1506 .kind = "macvlan",
1507 .setup = macvlan_setup,
1508 .newlink = macvlan_newlink,
1509 .dellink = macvlan_dellink,
1510 .get_link_net = macvlan_get_link_net,
1511};
1512
1513static int macvlan_device_event(struct notifier_block *unused,
1514 unsigned long event, void *ptr)
1515{
1516 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1517 struct macvlan_dev *vlan, *next;
1518 struct macvlan_port *port;
1519 LIST_HEAD(list_kill);
1520
1521 if (!macvlan_port_exists(dev))
1522 return NOTIFY_DONE;
1523
1524 port = macvlan_port_get_rtnl(dev);
1525
1526 switch (event) {
1527 case NETDEV_UP:
1528 case NETDEV_CHANGE:
1529 list_for_each_entry(vlan, &port->vlans, list)
1530 netif_stacked_transfer_operstate(vlan->lowerdev,
1531 vlan->dev);
1532 break;
1533 case NETDEV_FEAT_CHANGE:
1534 list_for_each_entry(vlan, &port->vlans, list) {
1535 vlan->dev->gso_max_size = dev->gso_max_size;
1536 vlan->dev->gso_max_segs = dev->gso_max_segs;
1537 netdev_update_features(vlan->dev);
1538 }
1539 break;
1540 case NETDEV_CHANGEMTU:
1541 list_for_each_entry(vlan, &port->vlans, list) {
1542 if (vlan->dev->mtu <= dev->mtu)
1543 continue;
1544 dev_set_mtu(vlan->dev, dev->mtu);
1545 }
1546 break;
1547 case NETDEV_CHANGEADDR:
1548 if (!port->passthru)
1549 return NOTIFY_DONE;
1550
1551 vlan = list_first_entry_or_null(&port->vlans,
1552 struct macvlan_dev,
1553 list);
1554
1555 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1556 return NOTIFY_BAD;
1557
1558 break;
1559 case NETDEV_UNREGISTER:
1560 /* twiddle thumbs on netns device moves */
1561 if (dev->reg_state != NETREG_UNREGISTERING)
1562 break;
1563
1564 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1565 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1566 unregister_netdevice_many(&list_kill);
1567 break;
1568 case NETDEV_PRE_TYPE_CHANGE:
1569 /* Forbid underlaying device to change its type. */
1570 return NOTIFY_BAD;
1571
1572 case NETDEV_NOTIFY_PEERS:
1573 case NETDEV_BONDING_FAILOVER:
1574 case NETDEV_RESEND_IGMP:
1575 /* Propagate to all vlans */
1576 list_for_each_entry(vlan, &port->vlans, list)
1577 call_netdevice_notifiers(event, vlan->dev);
1578 }
1579 return NOTIFY_DONE;
1580}
1581
1582static struct notifier_block macvlan_notifier_block __read_mostly = {
1583 .notifier_call = macvlan_device_event,
1584};
1585
1586static int __init macvlan_init_module(void)
1587{
1588 int err;
1589
1590 register_netdevice_notifier(&macvlan_notifier_block);
1591
1592 err = macvlan_link_register(&macvlan_link_ops);
1593 if (err < 0)
1594 goto err1;
1595 return 0;
1596err1:
1597 unregister_netdevice_notifier(&macvlan_notifier_block);
1598 return err;
1599}
1600
1601static void __exit macvlan_cleanup_module(void)
1602{
1603 rtnl_link_unregister(&macvlan_link_ops);
1604 unregister_netdevice_notifier(&macvlan_notifier_block);
1605}
1606
1607module_init(macvlan_init_module);
1608module_exit(macvlan_cleanup_module);
1609
1610MODULE_LICENSE("GPL");
1611MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1612MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1613MODULE_ALIAS_RTNL_LINK("macvlan");