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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
4 *
5 * The code this is based on carried the following copyright notice:
6 * ---
7 * (C) Copyright 2001-2006
8 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
9 * Re-worked by Ben Greear <greearb@candelatech.com>
10 * ---
11 */
12#include <linux/kernel.h>
13#include <linux/types.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/string.h>
19#include <linux/rculist.h>
20#include <linux/notifier.h>
21#include <linux/netdevice.h>
22#include <linux/etherdevice.h>
23#include <linux/net_tstamp.h>
24#include <linux/ethtool.h>
25#include <linux/if_arp.h>
26#include <linux/if_vlan.h>
27#include <linux/if_link.h>
28#include <linux/if_macvlan.h>
29#include <linux/hash.h>
30#include <linux/workqueue.h>
31#include <net/rtnetlink.h>
32#include <net/xfrm.h>
33#include <linux/netpoll.h>
34#include <linux/phy.h>
35
36#define MACVLAN_HASH_BITS 8
37#define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
38#define MACVLAN_BC_QUEUE_LEN 1000
39
40#define MACVLAN_F_PASSTHRU 1
41#define MACVLAN_F_ADDRCHANGE 2
42
43struct macvlan_port {
44 struct net_device *dev;
45 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
46 struct list_head vlans;
47 struct sk_buff_head bc_queue;
48 struct work_struct bc_work;
49 u32 flags;
50 int count;
51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
52 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
53 unsigned char perm_addr[ETH_ALEN];
54};
55
56struct macvlan_source_entry {
57 struct hlist_node hlist;
58 struct macvlan_dev *vlan;
59 unsigned char addr[6+2] __aligned(sizeof(u16));
60 struct rcu_head rcu;
61};
62
63struct macvlan_skb_cb {
64 const struct macvlan_dev *src;
65};
66
67#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
68
69static void macvlan_port_destroy(struct net_device *dev);
70
71static inline bool macvlan_passthru(const struct macvlan_port *port)
72{
73 return port->flags & MACVLAN_F_PASSTHRU;
74}
75
76static inline void macvlan_set_passthru(struct macvlan_port *port)
77{
78 port->flags |= MACVLAN_F_PASSTHRU;
79}
80
81static inline bool macvlan_addr_change(const struct macvlan_port *port)
82{
83 return port->flags & MACVLAN_F_ADDRCHANGE;
84}
85
86static inline void macvlan_set_addr_change(struct macvlan_port *port)
87{
88 port->flags |= MACVLAN_F_ADDRCHANGE;
89}
90
91static inline void macvlan_clear_addr_change(struct macvlan_port *port)
92{
93 port->flags &= ~MACVLAN_F_ADDRCHANGE;
94}
95
96/* Hash Ethernet address */
97static u32 macvlan_eth_hash(const unsigned char *addr)
98{
99 u64 value = get_unaligned((u64 *)addr);
100
101 /* only want 6 bytes */
102#ifdef __BIG_ENDIAN
103 value >>= 16;
104#else
105 value <<= 16;
106#endif
107 return hash_64(value, MACVLAN_HASH_BITS);
108}
109
110static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
111{
112 return rcu_dereference(dev->rx_handler_data);
113}
114
115static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
116{
117 return rtnl_dereference(dev->rx_handler_data);
118}
119
120static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
121 const unsigned char *addr)
122{
123 struct macvlan_dev *vlan;
124 u32 idx = macvlan_eth_hash(addr);
125
126 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
127 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
128 return vlan;
129 }
130 return NULL;
131}
132
133static struct macvlan_source_entry *macvlan_hash_lookup_source(
134 const struct macvlan_dev *vlan,
135 const unsigned char *addr)
136{
137 struct macvlan_source_entry *entry;
138 u32 idx = macvlan_eth_hash(addr);
139 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
140
141 hlist_for_each_entry_rcu(entry, h, hlist) {
142 if (ether_addr_equal_64bits(entry->addr, addr) &&
143 entry->vlan == vlan)
144 return entry;
145 }
146 return NULL;
147}
148
149static int macvlan_hash_add_source(struct macvlan_dev *vlan,
150 const unsigned char *addr)
151{
152 struct macvlan_port *port = vlan->port;
153 struct macvlan_source_entry *entry;
154 struct hlist_head *h;
155
156 entry = macvlan_hash_lookup_source(vlan, addr);
157 if (entry)
158 return 0;
159
160 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
161 if (!entry)
162 return -ENOMEM;
163
164 ether_addr_copy(entry->addr, addr);
165 entry->vlan = vlan;
166 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
167 hlist_add_head_rcu(&entry->hlist, h);
168 vlan->macaddr_count++;
169
170 return 0;
171}
172
173static void macvlan_hash_add(struct macvlan_dev *vlan)
174{
175 struct macvlan_port *port = vlan->port;
176 const unsigned char *addr = vlan->dev->dev_addr;
177 u32 idx = macvlan_eth_hash(addr);
178
179 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
180}
181
182static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
183{
184 hlist_del_rcu(&entry->hlist);
185 kfree_rcu(entry, rcu);
186}
187
188static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
189{
190 hlist_del_rcu(&vlan->hlist);
191 if (sync)
192 synchronize_rcu();
193}
194
195static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
196 const unsigned char *addr)
197{
198 macvlan_hash_del(vlan, true);
199 /* Now that we are unhashed it is safe to change the device
200 * address without confusing packet delivery.
201 */
202 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
203 macvlan_hash_add(vlan);
204}
205
206static bool macvlan_addr_busy(const struct macvlan_port *port,
207 const unsigned char *addr)
208{
209 /* Test to see if the specified address is
210 * currently in use by the underlying device or
211 * another macvlan.
212 */
213 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
214 ether_addr_equal_64bits(port->dev->dev_addr, addr))
215 return true;
216
217 if (macvlan_hash_lookup(port, addr))
218 return true;
219
220 return false;
221}
222
223
224static int macvlan_broadcast_one(struct sk_buff *skb,
225 const struct macvlan_dev *vlan,
226 const struct ethhdr *eth, bool local)
227{
228 struct net_device *dev = vlan->dev;
229
230 if (local)
231 return __dev_forward_skb(dev, skb);
232
233 skb->dev = dev;
234 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
235 skb->pkt_type = PACKET_BROADCAST;
236 else
237 skb->pkt_type = PACKET_MULTICAST;
238
239 return 0;
240}
241
242static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
243{
244 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
245}
246
247
248static unsigned int mc_hash(const struct macvlan_dev *vlan,
249 const unsigned char *addr)
250{
251 u32 val = __get_unaligned_cpu32(addr + 2);
252
253 val ^= macvlan_hash_mix(vlan);
254 return hash_32(val, MACVLAN_MC_FILTER_BITS);
255}
256
257static void macvlan_broadcast(struct sk_buff *skb,
258 const struct macvlan_port *port,
259 struct net_device *src,
260 enum macvlan_mode mode)
261{
262 const struct ethhdr *eth = eth_hdr(skb);
263 const struct macvlan_dev *vlan;
264 struct sk_buff *nskb;
265 unsigned int i;
266 int err;
267 unsigned int hash;
268
269 if (skb->protocol == htons(ETH_P_PAUSE))
270 return;
271
272 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
273 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
274 if (vlan->dev == src || !(vlan->mode & mode))
275 continue;
276
277 hash = mc_hash(vlan, eth->h_dest);
278 if (!test_bit(hash, vlan->mc_filter))
279 continue;
280
281 err = NET_RX_DROP;
282 nskb = skb_clone(skb, GFP_ATOMIC);
283 if (likely(nskb))
284 err = macvlan_broadcast_one(
285 nskb, vlan, eth,
286 mode == MACVLAN_MODE_BRIDGE) ?:
287 netif_rx_ni(nskb);
288 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
289 err == NET_RX_SUCCESS, true);
290 }
291 }
292}
293
294static void macvlan_process_broadcast(struct work_struct *w)
295{
296 struct macvlan_port *port = container_of(w, struct macvlan_port,
297 bc_work);
298 struct sk_buff *skb;
299 struct sk_buff_head list;
300
301 __skb_queue_head_init(&list);
302
303 spin_lock_bh(&port->bc_queue.lock);
304 skb_queue_splice_tail_init(&port->bc_queue, &list);
305 spin_unlock_bh(&port->bc_queue.lock);
306
307 while ((skb = __skb_dequeue(&list))) {
308 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
309
310 rcu_read_lock();
311
312 if (!src)
313 /* frame comes from an external address */
314 macvlan_broadcast(skb, port, NULL,
315 MACVLAN_MODE_PRIVATE |
316 MACVLAN_MODE_VEPA |
317 MACVLAN_MODE_PASSTHRU|
318 MACVLAN_MODE_BRIDGE);
319 else if (src->mode == MACVLAN_MODE_VEPA)
320 /* flood to everyone except source */
321 macvlan_broadcast(skb, port, src->dev,
322 MACVLAN_MODE_VEPA |
323 MACVLAN_MODE_BRIDGE);
324 else
325 /*
326 * flood only to VEPA ports, bridge ports
327 * already saw the frame on the way out.
328 */
329 macvlan_broadcast(skb, port, src->dev,
330 MACVLAN_MODE_VEPA);
331
332 rcu_read_unlock();
333
334 if (src)
335 dev_put(src->dev);
336 consume_skb(skb);
337 }
338}
339
340static void macvlan_broadcast_enqueue(struct macvlan_port *port,
341 const struct macvlan_dev *src,
342 struct sk_buff *skb)
343{
344 struct sk_buff *nskb;
345 int err = -ENOMEM;
346
347 nskb = skb_clone(skb, GFP_ATOMIC);
348 if (!nskb)
349 goto err;
350
351 MACVLAN_SKB_CB(nskb)->src = src;
352
353 spin_lock(&port->bc_queue.lock);
354 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
355 if (src)
356 dev_hold(src->dev);
357 __skb_queue_tail(&port->bc_queue, nskb);
358 err = 0;
359 }
360 spin_unlock(&port->bc_queue.lock);
361
362 if (err)
363 goto free_nskb;
364
365 schedule_work(&port->bc_work);
366 return;
367
368free_nskb:
369 kfree_skb(nskb);
370err:
371 atomic_long_inc(&skb->dev->rx_dropped);
372}
373
374static void macvlan_flush_sources(struct macvlan_port *port,
375 struct macvlan_dev *vlan)
376{
377 int i;
378
379 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
380 struct hlist_node *h, *n;
381
382 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
383 struct macvlan_source_entry *entry;
384
385 entry = hlist_entry(h, struct macvlan_source_entry,
386 hlist);
387 if (entry->vlan == vlan)
388 macvlan_hash_del_source(entry);
389 }
390 }
391 vlan->macaddr_count = 0;
392}
393
394static void macvlan_forward_source_one(struct sk_buff *skb,
395 struct macvlan_dev *vlan)
396{
397 struct sk_buff *nskb;
398 struct net_device *dev;
399 int len;
400 int ret;
401
402 dev = vlan->dev;
403 if (unlikely(!(dev->flags & IFF_UP)))
404 return;
405
406 nskb = skb_clone(skb, GFP_ATOMIC);
407 if (!nskb)
408 return;
409
410 len = nskb->len + ETH_HLEN;
411 nskb->dev = dev;
412
413 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
414 nskb->pkt_type = PACKET_HOST;
415
416 ret = netif_rx(nskb);
417 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
418}
419
420static void macvlan_forward_source(struct sk_buff *skb,
421 struct macvlan_port *port,
422 const unsigned char *addr)
423{
424 struct macvlan_source_entry *entry;
425 u32 idx = macvlan_eth_hash(addr);
426 struct hlist_head *h = &port->vlan_source_hash[idx];
427
428 hlist_for_each_entry_rcu(entry, h, hlist) {
429 if (ether_addr_equal_64bits(entry->addr, addr))
430 macvlan_forward_source_one(skb, entry->vlan);
431 }
432}
433
434/* called under rcu_read_lock() from netif_receive_skb */
435static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
436{
437 struct macvlan_port *port;
438 struct sk_buff *skb = *pskb;
439 const struct ethhdr *eth = eth_hdr(skb);
440 const struct macvlan_dev *vlan;
441 const struct macvlan_dev *src;
442 struct net_device *dev;
443 unsigned int len = 0;
444 int ret;
445 rx_handler_result_t handle_res;
446
447 port = macvlan_port_get_rcu(skb->dev);
448 if (is_multicast_ether_addr(eth->h_dest)) {
449 unsigned int hash;
450
451 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
452 if (!skb)
453 return RX_HANDLER_CONSUMED;
454 *pskb = skb;
455 eth = eth_hdr(skb);
456 macvlan_forward_source(skb, port, eth->h_source);
457 src = macvlan_hash_lookup(port, eth->h_source);
458 if (src && src->mode != MACVLAN_MODE_VEPA &&
459 src->mode != MACVLAN_MODE_BRIDGE) {
460 /* forward to original port. */
461 vlan = src;
462 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
463 netif_rx(skb);
464 handle_res = RX_HANDLER_CONSUMED;
465 goto out;
466 }
467
468 hash = mc_hash(NULL, eth->h_dest);
469 if (test_bit(hash, port->mc_filter))
470 macvlan_broadcast_enqueue(port, src, skb);
471
472 return RX_HANDLER_PASS;
473 }
474
475 macvlan_forward_source(skb, port, eth->h_source);
476 if (macvlan_passthru(port))
477 vlan = list_first_or_null_rcu(&port->vlans,
478 struct macvlan_dev, list);
479 else
480 vlan = macvlan_hash_lookup(port, eth->h_dest);
481 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
482 return RX_HANDLER_PASS;
483
484 dev = vlan->dev;
485 if (unlikely(!(dev->flags & IFF_UP))) {
486 kfree_skb(skb);
487 return RX_HANDLER_CONSUMED;
488 }
489 len = skb->len + ETH_HLEN;
490 skb = skb_share_check(skb, GFP_ATOMIC);
491 if (!skb) {
492 ret = NET_RX_DROP;
493 handle_res = RX_HANDLER_CONSUMED;
494 goto out;
495 }
496
497 *pskb = skb;
498 skb->dev = dev;
499 skb->pkt_type = PACKET_HOST;
500
501 ret = NET_RX_SUCCESS;
502 handle_res = RX_HANDLER_ANOTHER;
503out:
504 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
505 return handle_res;
506}
507
508static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
509{
510 const struct macvlan_dev *vlan = netdev_priv(dev);
511 const struct macvlan_port *port = vlan->port;
512 const struct macvlan_dev *dest;
513
514 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
515 const struct ethhdr *eth = (void *)skb->data;
516
517 /* send to other bridge ports directly */
518 if (is_multicast_ether_addr(eth->h_dest)) {
519 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
520 goto xmit_world;
521 }
522
523 dest = macvlan_hash_lookup(port, eth->h_dest);
524 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
525 /* send to lowerdev first for its network taps */
526 dev_forward_skb(vlan->lowerdev, skb);
527
528 return NET_XMIT_SUCCESS;
529 }
530 }
531xmit_world:
532 skb->dev = vlan->lowerdev;
533 return dev_queue_xmit_accel(skb,
534 netdev_get_sb_channel(dev) ? dev : NULL);
535}
536
537static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
538{
539#ifdef CONFIG_NET_POLL_CONTROLLER
540 if (vlan->netpoll)
541 netpoll_send_skb(vlan->netpoll, skb);
542#else
543 BUG();
544#endif
545 return NETDEV_TX_OK;
546}
547
548static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
549 struct net_device *dev)
550{
551 struct macvlan_dev *vlan = netdev_priv(dev);
552 unsigned int len = skb->len;
553 int ret;
554
555 if (unlikely(netpoll_tx_running(dev)))
556 return macvlan_netpoll_send_skb(vlan, skb);
557
558 ret = macvlan_queue_xmit(skb, dev);
559
560 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
561 struct vlan_pcpu_stats *pcpu_stats;
562
563 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
564 u64_stats_update_begin(&pcpu_stats->syncp);
565 pcpu_stats->tx_packets++;
566 pcpu_stats->tx_bytes += len;
567 u64_stats_update_end(&pcpu_stats->syncp);
568 } else {
569 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
570 }
571 return ret;
572}
573
574static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
575 unsigned short type, const void *daddr,
576 const void *saddr, unsigned len)
577{
578 const struct macvlan_dev *vlan = netdev_priv(dev);
579 struct net_device *lowerdev = vlan->lowerdev;
580
581 return dev_hard_header(skb, lowerdev, type, daddr,
582 saddr ? : dev->dev_addr, len);
583}
584
585static const struct header_ops macvlan_hard_header_ops = {
586 .create = macvlan_hard_header,
587 .parse = eth_header_parse,
588 .cache = eth_header_cache,
589 .cache_update = eth_header_cache_update,
590};
591
592static int macvlan_open(struct net_device *dev)
593{
594 struct macvlan_dev *vlan = netdev_priv(dev);
595 struct net_device *lowerdev = vlan->lowerdev;
596 int err;
597
598 if (macvlan_passthru(vlan->port)) {
599 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
600 err = dev_set_promiscuity(lowerdev, 1);
601 if (err < 0)
602 goto out;
603 }
604 goto hash_add;
605 }
606
607 err = -EADDRINUSE;
608 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
609 goto out;
610
611 /* Attempt to populate accel_priv which is used to offload the L2
612 * forwarding requests for unicast packets.
613 */
614 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
615 vlan->accel_priv =
616 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
617
618 /* If earlier attempt to offload failed, or accel_priv is not
619 * populated we must add the unicast address to the lower device.
620 */
621 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
622 vlan->accel_priv = NULL;
623 err = dev_uc_add(lowerdev, dev->dev_addr);
624 if (err < 0)
625 goto out;
626 }
627
628 if (dev->flags & IFF_ALLMULTI) {
629 err = dev_set_allmulti(lowerdev, 1);
630 if (err < 0)
631 goto del_unicast;
632 }
633
634 if (dev->flags & IFF_PROMISC) {
635 err = dev_set_promiscuity(lowerdev, 1);
636 if (err < 0)
637 goto clear_multi;
638 }
639
640hash_add:
641 macvlan_hash_add(vlan);
642 return 0;
643
644clear_multi:
645 if (dev->flags & IFF_ALLMULTI)
646 dev_set_allmulti(lowerdev, -1);
647del_unicast:
648 if (vlan->accel_priv) {
649 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
650 vlan->accel_priv);
651 vlan->accel_priv = NULL;
652 } else {
653 dev_uc_del(lowerdev, dev->dev_addr);
654 }
655out:
656 return err;
657}
658
659static int macvlan_stop(struct net_device *dev)
660{
661 struct macvlan_dev *vlan = netdev_priv(dev);
662 struct net_device *lowerdev = vlan->lowerdev;
663
664 if (vlan->accel_priv) {
665 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
666 vlan->accel_priv);
667 vlan->accel_priv = NULL;
668 }
669
670 dev_uc_unsync(lowerdev, dev);
671 dev_mc_unsync(lowerdev, dev);
672
673 if (macvlan_passthru(vlan->port)) {
674 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
675 dev_set_promiscuity(lowerdev, -1);
676 goto hash_del;
677 }
678
679 if (dev->flags & IFF_ALLMULTI)
680 dev_set_allmulti(lowerdev, -1);
681
682 if (dev->flags & IFF_PROMISC)
683 dev_set_promiscuity(lowerdev, -1);
684
685 dev_uc_del(lowerdev, dev->dev_addr);
686
687hash_del:
688 macvlan_hash_del(vlan, !dev->dismantle);
689 return 0;
690}
691
692static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
693{
694 struct macvlan_dev *vlan = netdev_priv(dev);
695 struct net_device *lowerdev = vlan->lowerdev;
696 struct macvlan_port *port = vlan->port;
697 int err;
698
699 if (!(dev->flags & IFF_UP)) {
700 /* Just copy in the new address */
701 ether_addr_copy(dev->dev_addr, addr);
702 } else {
703 /* Rehash and update the device filters */
704 if (macvlan_addr_busy(vlan->port, addr))
705 return -EADDRINUSE;
706
707 if (!macvlan_passthru(port)) {
708 err = dev_uc_add(lowerdev, addr);
709 if (err)
710 return err;
711
712 dev_uc_del(lowerdev, dev->dev_addr);
713 }
714
715 macvlan_hash_change_addr(vlan, addr);
716 }
717 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
718 /* Since addr_change isn't set, we are here due to lower
719 * device change. Save the lower-dev address so we can
720 * restore it later.
721 */
722 ether_addr_copy(vlan->port->perm_addr,
723 lowerdev->dev_addr);
724 }
725 macvlan_clear_addr_change(port);
726 return 0;
727}
728
729static int macvlan_set_mac_address(struct net_device *dev, void *p)
730{
731 struct macvlan_dev *vlan = netdev_priv(dev);
732 struct sockaddr *addr = p;
733
734 if (!is_valid_ether_addr(addr->sa_data))
735 return -EADDRNOTAVAIL;
736
737 /* If the addresses are the same, this is a no-op */
738 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
739 return 0;
740
741 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
742 macvlan_set_addr_change(vlan->port);
743 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
744 }
745
746 if (macvlan_addr_busy(vlan->port, addr->sa_data))
747 return -EADDRINUSE;
748
749 return macvlan_sync_address(dev, addr->sa_data);
750}
751
752static void macvlan_change_rx_flags(struct net_device *dev, int change)
753{
754 struct macvlan_dev *vlan = netdev_priv(dev);
755 struct net_device *lowerdev = vlan->lowerdev;
756
757 if (dev->flags & IFF_UP) {
758 if (change & IFF_ALLMULTI)
759 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
760 if (change & IFF_PROMISC)
761 dev_set_promiscuity(lowerdev,
762 dev->flags & IFF_PROMISC ? 1 : -1);
763
764 }
765}
766
767static void macvlan_compute_filter(unsigned long *mc_filter,
768 struct net_device *dev,
769 struct macvlan_dev *vlan)
770{
771 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
772 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
773 } else {
774 struct netdev_hw_addr *ha;
775 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
776
777 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
778 netdev_for_each_mc_addr(ha, dev) {
779 __set_bit(mc_hash(vlan, ha->addr), filter);
780 }
781
782 __set_bit(mc_hash(vlan, dev->broadcast), filter);
783
784 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
785 }
786}
787
788static void macvlan_set_mac_lists(struct net_device *dev)
789{
790 struct macvlan_dev *vlan = netdev_priv(dev);
791
792 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
793
794 dev_uc_sync(vlan->lowerdev, dev);
795 dev_mc_sync(vlan->lowerdev, dev);
796
797 /* This is slightly inaccurate as we're including the subscription
798 * list of vlan->lowerdev too.
799 *
800 * Bug alert: This only works if everyone has the same broadcast
801 * address as lowerdev. As soon as someone changes theirs this
802 * will break.
803 *
804 * However, this is already broken as when you change your broadcast
805 * address we don't get called.
806 *
807 * The solution is to maintain a list of broadcast addresses like
808 * we do for uc/mc, if you care.
809 */
810 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
811}
812
813static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
814{
815 struct macvlan_dev *vlan = netdev_priv(dev);
816
817 if (vlan->lowerdev->mtu < new_mtu)
818 return -EINVAL;
819 dev->mtu = new_mtu;
820 return 0;
821}
822
823static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
824{
825 struct net_device *real_dev = macvlan_dev_real_dev(dev);
826 const struct net_device_ops *ops = real_dev->netdev_ops;
827 struct ifreq ifrr;
828 int err = -EOPNOTSUPP;
829
830 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
831 ifrr.ifr_ifru = ifr->ifr_ifru;
832
833 switch (cmd) {
834 case SIOCSHWTSTAMP:
835 if (!net_eq(dev_net(dev), &init_net))
836 break;
837 /* fall through */
838 case SIOCGHWTSTAMP:
839 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
840 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
841 break;
842 }
843
844 if (!err)
845 ifr->ifr_ifru = ifrr.ifr_ifru;
846
847 return err;
848}
849
850/*
851 * macvlan network devices have devices nesting below it and are a special
852 * "super class" of normal network devices; split their locks off into a
853 * separate class since they always nest.
854 */
855#define ALWAYS_ON_OFFLOADS \
856 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
857 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
858
859#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
860
861#define MACVLAN_FEATURES \
862 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
863 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
864 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
865 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
866
867#define MACVLAN_STATE_MASK \
868 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
869
870static int macvlan_init(struct net_device *dev)
871{
872 struct macvlan_dev *vlan = netdev_priv(dev);
873 const struct net_device *lowerdev = vlan->lowerdev;
874 struct macvlan_port *port = vlan->port;
875
876 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
877 (lowerdev->state & MACVLAN_STATE_MASK);
878 dev->features = lowerdev->features & MACVLAN_FEATURES;
879 dev->features |= ALWAYS_ON_FEATURES;
880 dev->hw_features |= NETIF_F_LRO;
881 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
882 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
883 dev->hw_enc_features |= dev->features;
884 dev->gso_max_size = lowerdev->gso_max_size;
885 dev->gso_max_segs = lowerdev->gso_max_segs;
886 dev->hard_header_len = lowerdev->hard_header_len;
887
888 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
889 if (!vlan->pcpu_stats)
890 return -ENOMEM;
891
892 port->count += 1;
893
894 return 0;
895}
896
897static void macvlan_uninit(struct net_device *dev)
898{
899 struct macvlan_dev *vlan = netdev_priv(dev);
900 struct macvlan_port *port = vlan->port;
901
902 free_percpu(vlan->pcpu_stats);
903
904 macvlan_flush_sources(port, vlan);
905 port->count -= 1;
906 if (!port->count)
907 macvlan_port_destroy(port->dev);
908}
909
910static void macvlan_dev_get_stats64(struct net_device *dev,
911 struct rtnl_link_stats64 *stats)
912{
913 struct macvlan_dev *vlan = netdev_priv(dev);
914
915 if (vlan->pcpu_stats) {
916 struct vlan_pcpu_stats *p;
917 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
918 u32 rx_errors = 0, tx_dropped = 0;
919 unsigned int start;
920 int i;
921
922 for_each_possible_cpu(i) {
923 p = per_cpu_ptr(vlan->pcpu_stats, i);
924 do {
925 start = u64_stats_fetch_begin_irq(&p->syncp);
926 rx_packets = p->rx_packets;
927 rx_bytes = p->rx_bytes;
928 rx_multicast = p->rx_multicast;
929 tx_packets = p->tx_packets;
930 tx_bytes = p->tx_bytes;
931 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
932
933 stats->rx_packets += rx_packets;
934 stats->rx_bytes += rx_bytes;
935 stats->multicast += rx_multicast;
936 stats->tx_packets += tx_packets;
937 stats->tx_bytes += tx_bytes;
938 /* rx_errors & tx_dropped are u32, updated
939 * without syncp protection.
940 */
941 rx_errors += p->rx_errors;
942 tx_dropped += p->tx_dropped;
943 }
944 stats->rx_errors = rx_errors;
945 stats->rx_dropped = rx_errors;
946 stats->tx_dropped = tx_dropped;
947 }
948}
949
950static int macvlan_vlan_rx_add_vid(struct net_device *dev,
951 __be16 proto, u16 vid)
952{
953 struct macvlan_dev *vlan = netdev_priv(dev);
954 struct net_device *lowerdev = vlan->lowerdev;
955
956 return vlan_vid_add(lowerdev, proto, vid);
957}
958
959static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
960 __be16 proto, u16 vid)
961{
962 struct macvlan_dev *vlan = netdev_priv(dev);
963 struct net_device *lowerdev = vlan->lowerdev;
964
965 vlan_vid_del(lowerdev, proto, vid);
966 return 0;
967}
968
969static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
970 struct net_device *dev,
971 const unsigned char *addr, u16 vid,
972 u16 flags,
973 struct netlink_ext_ack *extack)
974{
975 struct macvlan_dev *vlan = netdev_priv(dev);
976 int err = -EINVAL;
977
978 /* Support unicast filter only on passthru devices.
979 * Multicast filter should be allowed on all devices.
980 */
981 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
982 return -EOPNOTSUPP;
983
984 if (flags & NLM_F_REPLACE)
985 return -EOPNOTSUPP;
986
987 if (is_unicast_ether_addr(addr))
988 err = dev_uc_add_excl(dev, addr);
989 else if (is_multicast_ether_addr(addr))
990 err = dev_mc_add_excl(dev, addr);
991
992 return err;
993}
994
995static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
996 struct net_device *dev,
997 const unsigned char *addr, u16 vid)
998{
999 struct macvlan_dev *vlan = netdev_priv(dev);
1000 int err = -EINVAL;
1001
1002 /* Support unicast filter only on passthru devices.
1003 * Multicast filter should be allowed on all devices.
1004 */
1005 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1006 return -EOPNOTSUPP;
1007
1008 if (is_unicast_ether_addr(addr))
1009 err = dev_uc_del(dev, addr);
1010 else if (is_multicast_ether_addr(addr))
1011 err = dev_mc_del(dev, addr);
1012
1013 return err;
1014}
1015
1016static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1017 struct ethtool_drvinfo *drvinfo)
1018{
1019 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1020 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1021}
1022
1023static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1024 struct ethtool_link_ksettings *cmd)
1025{
1026 const struct macvlan_dev *vlan = netdev_priv(dev);
1027
1028 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1029}
1030
1031static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1032 struct ethtool_ts_info *info)
1033{
1034 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1035 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1036 struct phy_device *phydev = real_dev->phydev;
1037
1038 if (phydev && phydev->drv && phydev->drv->ts_info) {
1039 return phydev->drv->ts_info(phydev, info);
1040 } else if (ops->get_ts_info) {
1041 return ops->get_ts_info(real_dev, info);
1042 } else {
1043 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1044 SOF_TIMESTAMPING_SOFTWARE;
1045 info->phc_index = -1;
1046 }
1047
1048 return 0;
1049}
1050
1051static netdev_features_t macvlan_fix_features(struct net_device *dev,
1052 netdev_features_t features)
1053{
1054 struct macvlan_dev *vlan = netdev_priv(dev);
1055 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1056 netdev_features_t mask;
1057
1058 features |= NETIF_F_ALL_FOR_ALL;
1059 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1060 mask = features;
1061
1062 lowerdev_features &= (features | ~NETIF_F_LRO);
1063 features = netdev_increment_features(lowerdev_features, features, mask);
1064 features |= ALWAYS_ON_FEATURES;
1065 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1066
1067 return features;
1068}
1069
1070#ifdef CONFIG_NET_POLL_CONTROLLER
1071static void macvlan_dev_poll_controller(struct net_device *dev)
1072{
1073 return;
1074}
1075
1076static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1077{
1078 struct macvlan_dev *vlan = netdev_priv(dev);
1079 struct net_device *real_dev = vlan->lowerdev;
1080 struct netpoll *netpoll;
1081 int err = 0;
1082
1083 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1084 err = -ENOMEM;
1085 if (!netpoll)
1086 goto out;
1087
1088 err = __netpoll_setup(netpoll, real_dev);
1089 if (err) {
1090 kfree(netpoll);
1091 goto out;
1092 }
1093
1094 vlan->netpoll = netpoll;
1095
1096out:
1097 return err;
1098}
1099
1100static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1101{
1102 struct macvlan_dev *vlan = netdev_priv(dev);
1103 struct netpoll *netpoll = vlan->netpoll;
1104
1105 if (!netpoll)
1106 return;
1107
1108 vlan->netpoll = NULL;
1109
1110 __netpoll_free(netpoll);
1111}
1112#endif /* CONFIG_NET_POLL_CONTROLLER */
1113
1114static int macvlan_dev_get_iflink(const struct net_device *dev)
1115{
1116 struct macvlan_dev *vlan = netdev_priv(dev);
1117
1118 return vlan->lowerdev->ifindex;
1119}
1120
1121static const struct ethtool_ops macvlan_ethtool_ops = {
1122 .get_link = ethtool_op_get_link,
1123 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1124 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1125 .get_ts_info = macvlan_ethtool_get_ts_info,
1126};
1127
1128static const struct net_device_ops macvlan_netdev_ops = {
1129 .ndo_init = macvlan_init,
1130 .ndo_uninit = macvlan_uninit,
1131 .ndo_open = macvlan_open,
1132 .ndo_stop = macvlan_stop,
1133 .ndo_start_xmit = macvlan_start_xmit,
1134 .ndo_change_mtu = macvlan_change_mtu,
1135 .ndo_do_ioctl = macvlan_do_ioctl,
1136 .ndo_fix_features = macvlan_fix_features,
1137 .ndo_change_rx_flags = macvlan_change_rx_flags,
1138 .ndo_set_mac_address = macvlan_set_mac_address,
1139 .ndo_set_rx_mode = macvlan_set_mac_lists,
1140 .ndo_get_stats64 = macvlan_dev_get_stats64,
1141 .ndo_validate_addr = eth_validate_addr,
1142 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1143 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1144 .ndo_fdb_add = macvlan_fdb_add,
1145 .ndo_fdb_del = macvlan_fdb_del,
1146 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1147#ifdef CONFIG_NET_POLL_CONTROLLER
1148 .ndo_poll_controller = macvlan_dev_poll_controller,
1149 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1150 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1151#endif
1152 .ndo_get_iflink = macvlan_dev_get_iflink,
1153 .ndo_features_check = passthru_features_check,
1154 .ndo_change_proto_down = dev_change_proto_down_generic,
1155};
1156
1157void macvlan_common_setup(struct net_device *dev)
1158{
1159 ether_setup(dev);
1160
1161 dev->min_mtu = 0;
1162 dev->max_mtu = ETH_MAX_MTU;
1163 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1164 netif_keep_dst(dev);
1165 dev->priv_flags |= IFF_UNICAST_FLT;
1166 dev->netdev_ops = &macvlan_netdev_ops;
1167 dev->needs_free_netdev = true;
1168 dev->header_ops = &macvlan_hard_header_ops;
1169 dev->ethtool_ops = &macvlan_ethtool_ops;
1170}
1171EXPORT_SYMBOL_GPL(macvlan_common_setup);
1172
1173static void macvlan_setup(struct net_device *dev)
1174{
1175 macvlan_common_setup(dev);
1176 dev->priv_flags |= IFF_NO_QUEUE;
1177}
1178
1179static int macvlan_port_create(struct net_device *dev)
1180{
1181 struct macvlan_port *port;
1182 unsigned int i;
1183 int err;
1184
1185 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1186 return -EINVAL;
1187
1188 if (netdev_is_rx_handler_busy(dev))
1189 return -EBUSY;
1190
1191 port = kzalloc(sizeof(*port), GFP_KERNEL);
1192 if (port == NULL)
1193 return -ENOMEM;
1194
1195 port->dev = dev;
1196 ether_addr_copy(port->perm_addr, dev->dev_addr);
1197 INIT_LIST_HEAD(&port->vlans);
1198 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1199 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1200 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1201 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1202
1203 skb_queue_head_init(&port->bc_queue);
1204 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1205
1206 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1207 if (err)
1208 kfree(port);
1209 else
1210 dev->priv_flags |= IFF_MACVLAN_PORT;
1211 return err;
1212}
1213
1214static void macvlan_port_destroy(struct net_device *dev)
1215{
1216 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1217 struct sk_buff *skb;
1218
1219 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1220 netdev_rx_handler_unregister(dev);
1221
1222 /* After this point, no packet can schedule bc_work anymore,
1223 * but we need to cancel it and purge left skbs if any.
1224 */
1225 cancel_work_sync(&port->bc_work);
1226
1227 while ((skb = __skb_dequeue(&port->bc_queue))) {
1228 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1229
1230 if (src)
1231 dev_put(src->dev);
1232
1233 kfree_skb(skb);
1234 }
1235
1236 /* If the lower device address has been changed by passthru
1237 * macvlan, put it back.
1238 */
1239 if (macvlan_passthru(port) &&
1240 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1241 struct sockaddr sa;
1242
1243 sa.sa_family = port->dev->type;
1244 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1245 dev_set_mac_address(port->dev, &sa, NULL);
1246 }
1247
1248 kfree(port);
1249}
1250
1251static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1252 struct netlink_ext_ack *extack)
1253{
1254 if (tb[IFLA_ADDRESS]) {
1255 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1256 return -EINVAL;
1257 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1258 return -EADDRNOTAVAIL;
1259 }
1260
1261 if (!data)
1262 return 0;
1263
1264 if (data[IFLA_MACVLAN_FLAGS] &&
1265 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1266 return -EINVAL;
1267
1268 if (data[IFLA_MACVLAN_MODE]) {
1269 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1270 case MACVLAN_MODE_PRIVATE:
1271 case MACVLAN_MODE_VEPA:
1272 case MACVLAN_MODE_BRIDGE:
1273 case MACVLAN_MODE_PASSTHRU:
1274 case MACVLAN_MODE_SOURCE:
1275 break;
1276 default:
1277 return -EINVAL;
1278 }
1279 }
1280
1281 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1282 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1283 case MACVLAN_MACADDR_ADD:
1284 case MACVLAN_MACADDR_DEL:
1285 case MACVLAN_MACADDR_FLUSH:
1286 case MACVLAN_MACADDR_SET:
1287 break;
1288 default:
1289 return -EINVAL;
1290 }
1291 }
1292
1293 if (data[IFLA_MACVLAN_MACADDR]) {
1294 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1295 return -EINVAL;
1296
1297 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1298 return -EADDRNOTAVAIL;
1299 }
1300
1301 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1302 return -EINVAL;
1303
1304 return 0;
1305}
1306
1307/**
1308 * reconfigure list of remote source mac address
1309 * (only for macvlan devices in source mode)
1310 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1311 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1312 */
1313static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1314 struct nlattr *data[])
1315{
1316 char *addr = NULL;
1317 int ret, rem, len;
1318 struct nlattr *nla, *head;
1319 struct macvlan_source_entry *entry;
1320
1321 if (data[IFLA_MACVLAN_MACADDR])
1322 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1323
1324 if (mode == MACVLAN_MACADDR_ADD) {
1325 if (!addr)
1326 return -EINVAL;
1327
1328 return macvlan_hash_add_source(vlan, addr);
1329
1330 } else if (mode == MACVLAN_MACADDR_DEL) {
1331 if (!addr)
1332 return -EINVAL;
1333
1334 entry = macvlan_hash_lookup_source(vlan, addr);
1335 if (entry) {
1336 macvlan_hash_del_source(entry);
1337 vlan->macaddr_count--;
1338 }
1339 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1340 macvlan_flush_sources(vlan->port, vlan);
1341 } else if (mode == MACVLAN_MACADDR_SET) {
1342 macvlan_flush_sources(vlan->port, vlan);
1343
1344 if (addr) {
1345 ret = macvlan_hash_add_source(vlan, addr);
1346 if (ret)
1347 return ret;
1348 }
1349
1350 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1351 return 0;
1352
1353 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1354 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1355
1356 nla_for_each_attr(nla, head, len, rem) {
1357 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1358 nla_len(nla) != ETH_ALEN)
1359 continue;
1360
1361 addr = nla_data(nla);
1362 ret = macvlan_hash_add_source(vlan, addr);
1363 if (ret)
1364 return ret;
1365 }
1366 } else {
1367 return -EINVAL;
1368 }
1369
1370 return 0;
1371}
1372
1373int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1374 struct nlattr *tb[], struct nlattr *data[],
1375 struct netlink_ext_ack *extack)
1376{
1377 struct macvlan_dev *vlan = netdev_priv(dev);
1378 struct macvlan_port *port;
1379 struct net_device *lowerdev;
1380 int err;
1381 int macmode;
1382 bool create = false;
1383
1384 if (!tb[IFLA_LINK])
1385 return -EINVAL;
1386
1387 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1388 if (lowerdev == NULL)
1389 return -ENODEV;
1390
1391 /* When creating macvlans or macvtaps on top of other macvlans - use
1392 * the real device as the lowerdev.
1393 */
1394 if (netif_is_macvlan(lowerdev))
1395 lowerdev = macvlan_dev_real_dev(lowerdev);
1396
1397 if (!tb[IFLA_MTU])
1398 dev->mtu = lowerdev->mtu;
1399 else if (dev->mtu > lowerdev->mtu)
1400 return -EINVAL;
1401
1402 /* MTU range: 68 - lowerdev->max_mtu */
1403 dev->min_mtu = ETH_MIN_MTU;
1404 dev->max_mtu = lowerdev->max_mtu;
1405
1406 if (!tb[IFLA_ADDRESS])
1407 eth_hw_addr_random(dev);
1408
1409 if (!netif_is_macvlan_port(lowerdev)) {
1410 err = macvlan_port_create(lowerdev);
1411 if (err < 0)
1412 return err;
1413 create = true;
1414 }
1415 port = macvlan_port_get_rtnl(lowerdev);
1416
1417 /* Only 1 macvlan device can be created in passthru mode */
1418 if (macvlan_passthru(port)) {
1419 /* The macvlan port must be not created this time,
1420 * still goto destroy_macvlan_port for readability.
1421 */
1422 err = -EINVAL;
1423 goto destroy_macvlan_port;
1424 }
1425
1426 vlan->lowerdev = lowerdev;
1427 vlan->dev = dev;
1428 vlan->port = port;
1429 vlan->set_features = MACVLAN_FEATURES;
1430
1431 vlan->mode = MACVLAN_MODE_VEPA;
1432 if (data && data[IFLA_MACVLAN_MODE])
1433 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1434
1435 if (data && data[IFLA_MACVLAN_FLAGS])
1436 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1437
1438 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1439 if (port->count) {
1440 err = -EINVAL;
1441 goto destroy_macvlan_port;
1442 }
1443 macvlan_set_passthru(port);
1444 eth_hw_addr_inherit(dev, lowerdev);
1445 }
1446
1447 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1448 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1449 err = -EINVAL;
1450 goto destroy_macvlan_port;
1451 }
1452 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1453 err = macvlan_changelink_sources(vlan, macmode, data);
1454 if (err)
1455 goto destroy_macvlan_port;
1456 }
1457
1458 err = register_netdevice(dev);
1459 if (err < 0)
1460 goto destroy_macvlan_port;
1461
1462 dev->priv_flags |= IFF_MACVLAN;
1463 err = netdev_upper_dev_link(lowerdev, dev, extack);
1464 if (err)
1465 goto unregister_netdev;
1466
1467 list_add_tail_rcu(&vlan->list, &port->vlans);
1468 netif_stacked_transfer_operstate(lowerdev, dev);
1469 linkwatch_fire_event(dev);
1470
1471 return 0;
1472
1473unregister_netdev:
1474 /* macvlan_uninit would free the macvlan port */
1475 unregister_netdevice(dev);
1476 return err;
1477destroy_macvlan_port:
1478 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1479 * so we destroy the macvlan port only when it's valid.
1480 */
1481 if (create && macvlan_port_get_rtnl(lowerdev))
1482 macvlan_port_destroy(port->dev);
1483 return err;
1484}
1485EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1486
1487static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1488 struct nlattr *tb[], struct nlattr *data[],
1489 struct netlink_ext_ack *extack)
1490{
1491 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1492}
1493
1494void macvlan_dellink(struct net_device *dev, struct list_head *head)
1495{
1496 struct macvlan_dev *vlan = netdev_priv(dev);
1497
1498 if (vlan->mode == MACVLAN_MODE_SOURCE)
1499 macvlan_flush_sources(vlan->port, vlan);
1500 list_del_rcu(&vlan->list);
1501 unregister_netdevice_queue(dev, head);
1502 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1503}
1504EXPORT_SYMBOL_GPL(macvlan_dellink);
1505
1506static int macvlan_changelink(struct net_device *dev,
1507 struct nlattr *tb[], struct nlattr *data[],
1508 struct netlink_ext_ack *extack)
1509{
1510 struct macvlan_dev *vlan = netdev_priv(dev);
1511 enum macvlan_mode mode;
1512 bool set_mode = false;
1513 enum macvlan_macaddr_mode macmode;
1514 int ret;
1515
1516 /* Validate mode, but don't set yet: setting flags may fail. */
1517 if (data && data[IFLA_MACVLAN_MODE]) {
1518 set_mode = true;
1519 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1520 /* Passthrough mode can't be set or cleared dynamically */
1521 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1522 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1523 return -EINVAL;
1524 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1525 vlan->mode != mode)
1526 macvlan_flush_sources(vlan->port, vlan);
1527 }
1528
1529 if (data && data[IFLA_MACVLAN_FLAGS]) {
1530 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1531 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1532 if (macvlan_passthru(vlan->port) && promisc) {
1533 int err;
1534
1535 if (flags & MACVLAN_FLAG_NOPROMISC)
1536 err = dev_set_promiscuity(vlan->lowerdev, -1);
1537 else
1538 err = dev_set_promiscuity(vlan->lowerdev, 1);
1539 if (err < 0)
1540 return err;
1541 }
1542 vlan->flags = flags;
1543 }
1544 if (set_mode)
1545 vlan->mode = mode;
1546 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1547 if (vlan->mode != MACVLAN_MODE_SOURCE)
1548 return -EINVAL;
1549 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1550 ret = macvlan_changelink_sources(vlan, macmode, data);
1551 if (ret)
1552 return ret;
1553 }
1554 return 0;
1555}
1556
1557static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1558{
1559 if (vlan->macaddr_count == 0)
1560 return 0;
1561 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1562 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1563}
1564
1565static size_t macvlan_get_size(const struct net_device *dev)
1566{
1567 struct macvlan_dev *vlan = netdev_priv(dev);
1568
1569 return (0
1570 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1571 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1572 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1573 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1574 );
1575}
1576
1577static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1578 const struct macvlan_dev *vlan,
1579 const int i)
1580{
1581 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1582 struct macvlan_source_entry *entry;
1583
1584 hlist_for_each_entry_rcu(entry, h, hlist) {
1585 if (entry->vlan != vlan)
1586 continue;
1587 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1588 return 1;
1589 }
1590 return 0;
1591}
1592
1593static int macvlan_fill_info(struct sk_buff *skb,
1594 const struct net_device *dev)
1595{
1596 struct macvlan_dev *vlan = netdev_priv(dev);
1597 int i;
1598 struct nlattr *nest;
1599
1600 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1601 goto nla_put_failure;
1602 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1603 goto nla_put_failure;
1604 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1605 goto nla_put_failure;
1606 if (vlan->macaddr_count > 0) {
1607 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1608 if (nest == NULL)
1609 goto nla_put_failure;
1610
1611 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1612 if (macvlan_fill_info_macaddr(skb, vlan, i))
1613 goto nla_put_failure;
1614 }
1615 nla_nest_end(skb, nest);
1616 }
1617 return 0;
1618
1619nla_put_failure:
1620 return -EMSGSIZE;
1621}
1622
1623static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1624 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1625 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1626 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1627 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1628 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1629 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1630};
1631
1632int macvlan_link_register(struct rtnl_link_ops *ops)
1633{
1634 /* common fields */
1635 ops->validate = macvlan_validate;
1636 ops->maxtype = IFLA_MACVLAN_MAX;
1637 ops->policy = macvlan_policy;
1638 ops->changelink = macvlan_changelink;
1639 ops->get_size = macvlan_get_size;
1640 ops->fill_info = macvlan_fill_info;
1641
1642 return rtnl_link_register(ops);
1643};
1644EXPORT_SYMBOL_GPL(macvlan_link_register);
1645
1646static struct net *macvlan_get_link_net(const struct net_device *dev)
1647{
1648 return dev_net(macvlan_dev_real_dev(dev));
1649}
1650
1651static struct rtnl_link_ops macvlan_link_ops = {
1652 .kind = "macvlan",
1653 .setup = macvlan_setup,
1654 .newlink = macvlan_newlink,
1655 .dellink = macvlan_dellink,
1656 .get_link_net = macvlan_get_link_net,
1657 .priv_size = sizeof(struct macvlan_dev),
1658};
1659
1660static int macvlan_device_event(struct notifier_block *unused,
1661 unsigned long event, void *ptr)
1662{
1663 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1664 struct macvlan_dev *vlan, *next;
1665 struct macvlan_port *port;
1666 LIST_HEAD(list_kill);
1667
1668 if (!netif_is_macvlan_port(dev))
1669 return NOTIFY_DONE;
1670
1671 port = macvlan_port_get_rtnl(dev);
1672
1673 switch (event) {
1674 case NETDEV_UP:
1675 case NETDEV_DOWN:
1676 case NETDEV_CHANGE:
1677 list_for_each_entry(vlan, &port->vlans, list)
1678 netif_stacked_transfer_operstate(vlan->lowerdev,
1679 vlan->dev);
1680 break;
1681 case NETDEV_FEAT_CHANGE:
1682 list_for_each_entry(vlan, &port->vlans, list) {
1683 vlan->dev->gso_max_size = dev->gso_max_size;
1684 vlan->dev->gso_max_segs = dev->gso_max_segs;
1685 netdev_update_features(vlan->dev);
1686 }
1687 break;
1688 case NETDEV_CHANGEMTU:
1689 list_for_each_entry(vlan, &port->vlans, list) {
1690 if (vlan->dev->mtu <= dev->mtu)
1691 continue;
1692 dev_set_mtu(vlan->dev, dev->mtu);
1693 }
1694 break;
1695 case NETDEV_CHANGEADDR:
1696 if (!macvlan_passthru(port))
1697 return NOTIFY_DONE;
1698
1699 vlan = list_first_entry_or_null(&port->vlans,
1700 struct macvlan_dev,
1701 list);
1702
1703 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1704 return NOTIFY_BAD;
1705
1706 break;
1707 case NETDEV_UNREGISTER:
1708 /* twiddle thumbs on netns device moves */
1709 if (dev->reg_state != NETREG_UNREGISTERING)
1710 break;
1711
1712 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1713 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1714 unregister_netdevice_many(&list_kill);
1715 break;
1716 case NETDEV_PRE_TYPE_CHANGE:
1717 /* Forbid underlaying device to change its type. */
1718 return NOTIFY_BAD;
1719
1720 case NETDEV_NOTIFY_PEERS:
1721 case NETDEV_BONDING_FAILOVER:
1722 case NETDEV_RESEND_IGMP:
1723 /* Propagate to all vlans */
1724 list_for_each_entry(vlan, &port->vlans, list)
1725 call_netdevice_notifiers(event, vlan->dev);
1726 }
1727 return NOTIFY_DONE;
1728}
1729
1730static struct notifier_block macvlan_notifier_block __read_mostly = {
1731 .notifier_call = macvlan_device_event,
1732};
1733
1734static int __init macvlan_init_module(void)
1735{
1736 int err;
1737
1738 register_netdevice_notifier(&macvlan_notifier_block);
1739
1740 err = macvlan_link_register(&macvlan_link_ops);
1741 if (err < 0)
1742 goto err1;
1743 return 0;
1744err1:
1745 unregister_netdevice_notifier(&macvlan_notifier_block);
1746 return err;
1747}
1748
1749static void __exit macvlan_cleanup_module(void)
1750{
1751 rtnl_link_unregister(&macvlan_link_ops);
1752 unregister_netdevice_notifier(&macvlan_notifier_block);
1753}
1754
1755module_init(macvlan_init_module);
1756module_exit(macvlan_cleanup_module);
1757
1758MODULE_LICENSE("GPL");
1759MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1760MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1761MODULE_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 <net/rtnetlink.h>
33#include <net/xfrm.h>
34
35#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
36
37struct macvlan_port {
38 struct net_device *dev;
39 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
40 struct list_head vlans;
41 struct rcu_head rcu;
42 bool passthru;
43 int count;
44};
45
46static void macvlan_port_destroy(struct net_device *dev);
47
48#define macvlan_port_get_rcu(dev) \
49 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
50#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
51#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
52
53static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
54 const unsigned char *addr)
55{
56 struct macvlan_dev *vlan;
57 struct hlist_node *n;
58
59 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
60 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
61 return vlan;
62 }
63 return NULL;
64}
65
66static void macvlan_hash_add(struct macvlan_dev *vlan)
67{
68 struct macvlan_port *port = vlan->port;
69 const unsigned char *addr = vlan->dev->dev_addr;
70
71 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
72}
73
74static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
75{
76 hlist_del_rcu(&vlan->hlist);
77 if (sync)
78 synchronize_rcu();
79}
80
81static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
82 const unsigned char *addr)
83{
84 macvlan_hash_del(vlan, true);
85 /* Now that we are unhashed it is safe to change the device
86 * address without confusing packet delivery.
87 */
88 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
89 macvlan_hash_add(vlan);
90}
91
92static int macvlan_addr_busy(const struct macvlan_port *port,
93 const unsigned char *addr)
94{
95 /* Test to see if the specified multicast address is
96 * currently in use by the underlying device or
97 * another macvlan.
98 */
99 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
100 return 1;
101
102 if (macvlan_hash_lookup(port, addr))
103 return 1;
104
105 return 0;
106}
107
108
109static int macvlan_broadcast_one(struct sk_buff *skb,
110 const struct macvlan_dev *vlan,
111 const struct ethhdr *eth, bool local)
112{
113 struct net_device *dev = vlan->dev;
114 if (!skb)
115 return NET_RX_DROP;
116
117 if (local)
118 return vlan->forward(dev, skb);
119
120 skb->dev = dev;
121 if (ether_addr_equal_64bits(eth->h_dest, 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 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
173 if (!skb)
174 return RX_HANDLER_CONSUMED;
175 eth = eth_hdr(skb);
176 src = macvlan_hash_lookup(port, eth->h_source);
177 if (!src)
178 /* frame comes from an external address */
179 macvlan_broadcast(skb, port, NULL,
180 MACVLAN_MODE_PRIVATE |
181 MACVLAN_MODE_VEPA |
182 MACVLAN_MODE_PASSTHRU|
183 MACVLAN_MODE_BRIDGE);
184 else if (src->mode == MACVLAN_MODE_VEPA)
185 /* flood to everyone except source */
186 macvlan_broadcast(skb, port, src->dev,
187 MACVLAN_MODE_VEPA |
188 MACVLAN_MODE_BRIDGE);
189 else if (src->mode == MACVLAN_MODE_BRIDGE)
190 /*
191 * flood only to VEPA ports, bridge ports
192 * already saw the frame on the way out.
193 */
194 macvlan_broadcast(skb, port, src->dev,
195 MACVLAN_MODE_VEPA);
196 else {
197 /* forward to original port. */
198 vlan = src;
199 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
200 goto out;
201 }
202
203 return RX_HANDLER_PASS;
204 }
205
206 if (port->passthru)
207 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
208 else
209 vlan = macvlan_hash_lookup(port, eth->h_dest);
210 if (vlan == NULL)
211 return RX_HANDLER_PASS;
212
213 dev = vlan->dev;
214 if (unlikely(!(dev->flags & IFF_UP))) {
215 kfree_skb(skb);
216 return RX_HANDLER_CONSUMED;
217 }
218 len = skb->len + ETH_HLEN;
219 skb = skb_share_check(skb, GFP_ATOMIC);
220 if (!skb)
221 goto out;
222
223 skb->dev = dev;
224 skb->pkt_type = PACKET_HOST;
225
226 ret = vlan->receive(skb);
227
228out:
229 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
230 return RX_HANDLER_CONSUMED;
231}
232
233static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
234{
235 const struct macvlan_dev *vlan = netdev_priv(dev);
236 const struct macvlan_port *port = vlan->port;
237 const struct macvlan_dev *dest;
238 __u8 ip_summed = skb->ip_summed;
239
240 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
241 const struct ethhdr *eth = (void *)skb->data;
242 skb->ip_summed = CHECKSUM_UNNECESSARY;
243
244 /* send to other bridge ports directly */
245 if (is_multicast_ether_addr(eth->h_dest)) {
246 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
247 goto xmit_world;
248 }
249
250 dest = macvlan_hash_lookup(port, eth->h_dest);
251 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
252 /* send to lowerdev first for its network taps */
253 dev_forward_skb(vlan->lowerdev, skb);
254
255 return NET_XMIT_SUCCESS;
256 }
257 }
258
259xmit_world:
260 skb->ip_summed = ip_summed;
261 skb->dev = vlan->lowerdev;
262 return dev_queue_xmit(skb);
263}
264
265netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
266 struct net_device *dev)
267{
268 unsigned int len = skb->len;
269 int ret;
270 const struct macvlan_dev *vlan = netdev_priv(dev);
271
272 ret = macvlan_queue_xmit(skb, dev);
273 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
274 struct macvlan_pcpu_stats *pcpu_stats;
275
276 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
277 u64_stats_update_begin(&pcpu_stats->syncp);
278 pcpu_stats->tx_packets++;
279 pcpu_stats->tx_bytes += len;
280 u64_stats_update_end(&pcpu_stats->syncp);
281 } else {
282 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
283 }
284 return ret;
285}
286EXPORT_SYMBOL_GPL(macvlan_start_xmit);
287
288static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
289 unsigned short type, const void *daddr,
290 const void *saddr, unsigned len)
291{
292 const struct macvlan_dev *vlan = netdev_priv(dev);
293 struct net_device *lowerdev = vlan->lowerdev;
294
295 return dev_hard_header(skb, lowerdev, type, daddr,
296 saddr ? : dev->dev_addr, len);
297}
298
299static const struct header_ops macvlan_hard_header_ops = {
300 .create = macvlan_hard_header,
301 .rebuild = eth_rebuild_header,
302 .parse = eth_header_parse,
303 .cache = eth_header_cache,
304 .cache_update = eth_header_cache_update,
305};
306
307static int macvlan_open(struct net_device *dev)
308{
309 struct macvlan_dev *vlan = netdev_priv(dev);
310 struct net_device *lowerdev = vlan->lowerdev;
311 int err;
312
313 if (vlan->port->passthru) {
314 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
315 dev_set_promiscuity(lowerdev, 1);
316 goto hash_add;
317 }
318
319 err = -EBUSY;
320 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
321 goto out;
322
323 err = dev_uc_add(lowerdev, dev->dev_addr);
324 if (err < 0)
325 goto out;
326 if (dev->flags & IFF_ALLMULTI) {
327 err = dev_set_allmulti(lowerdev, 1);
328 if (err < 0)
329 goto del_unicast;
330 }
331
332hash_add:
333 macvlan_hash_add(vlan);
334 return 0;
335
336del_unicast:
337 dev_uc_del(lowerdev, dev->dev_addr);
338out:
339 return err;
340}
341
342static int macvlan_stop(struct net_device *dev)
343{
344 struct macvlan_dev *vlan = netdev_priv(dev);
345 struct net_device *lowerdev = vlan->lowerdev;
346
347 dev_uc_unsync(lowerdev, dev);
348 dev_mc_unsync(lowerdev, dev);
349
350 if (vlan->port->passthru) {
351 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
352 dev_set_promiscuity(lowerdev, -1);
353 goto hash_del;
354 }
355
356 if (dev->flags & IFF_ALLMULTI)
357 dev_set_allmulti(lowerdev, -1);
358
359 dev_uc_del(lowerdev, dev->dev_addr);
360
361hash_del:
362 macvlan_hash_del(vlan, !dev->dismantle);
363 return 0;
364}
365
366static int macvlan_set_mac_address(struct net_device *dev, void *p)
367{
368 struct macvlan_dev *vlan = netdev_priv(dev);
369 struct net_device *lowerdev = vlan->lowerdev;
370 struct sockaddr *addr = p;
371 int err;
372
373 if (!is_valid_ether_addr(addr->sa_data))
374 return -EADDRNOTAVAIL;
375
376 if (!(dev->flags & IFF_UP)) {
377 /* Just copy in the new address */
378 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
379 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
380 } else {
381 /* Rehash and update the device filters */
382 if (macvlan_addr_busy(vlan->port, addr->sa_data))
383 return -EBUSY;
384
385 err = dev_uc_add(lowerdev, addr->sa_data);
386 if (err)
387 return err;
388
389 dev_uc_del(lowerdev, dev->dev_addr);
390
391 macvlan_hash_change_addr(vlan, addr->sa_data);
392 }
393 return 0;
394}
395
396static void macvlan_change_rx_flags(struct net_device *dev, int change)
397{
398 struct macvlan_dev *vlan = netdev_priv(dev);
399 struct net_device *lowerdev = vlan->lowerdev;
400
401 if (change & IFF_ALLMULTI)
402 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
403}
404
405static void macvlan_set_mac_lists(struct net_device *dev)
406{
407 struct macvlan_dev *vlan = netdev_priv(dev);
408
409 dev_uc_sync(vlan->lowerdev, dev);
410 dev_mc_sync(vlan->lowerdev, dev);
411}
412
413static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
414{
415 struct macvlan_dev *vlan = netdev_priv(dev);
416
417 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
418 return -EINVAL;
419 dev->mtu = new_mtu;
420 return 0;
421}
422
423/*
424 * macvlan network devices have devices nesting below it and are a special
425 * "super class" of normal network devices; split their locks off into a
426 * separate class since they always nest.
427 */
428static struct lock_class_key macvlan_netdev_xmit_lock_key;
429static struct lock_class_key macvlan_netdev_addr_lock_key;
430
431#define MACVLAN_FEATURES \
432 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
433 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
434 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
435 NETIF_F_HW_VLAN_FILTER)
436
437#define MACVLAN_STATE_MASK \
438 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
439
440static void macvlan_set_lockdep_class_one(struct net_device *dev,
441 struct netdev_queue *txq,
442 void *_unused)
443{
444 lockdep_set_class(&txq->_xmit_lock,
445 &macvlan_netdev_xmit_lock_key);
446}
447
448static void macvlan_set_lockdep_class(struct net_device *dev)
449{
450 lockdep_set_class(&dev->addr_list_lock,
451 &macvlan_netdev_addr_lock_key);
452 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
453}
454
455static int macvlan_init(struct net_device *dev)
456{
457 struct macvlan_dev *vlan = netdev_priv(dev);
458 const struct net_device *lowerdev = vlan->lowerdev;
459
460 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
461 (lowerdev->state & MACVLAN_STATE_MASK);
462 dev->features = lowerdev->features & MACVLAN_FEATURES;
463 dev->features |= NETIF_F_LLTX;
464 dev->gso_max_size = lowerdev->gso_max_size;
465 dev->iflink = lowerdev->ifindex;
466 dev->hard_header_len = lowerdev->hard_header_len;
467
468 macvlan_set_lockdep_class(dev);
469
470 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
471 if (!vlan->pcpu_stats)
472 return -ENOMEM;
473
474 return 0;
475}
476
477static void macvlan_uninit(struct net_device *dev)
478{
479 struct macvlan_dev *vlan = netdev_priv(dev);
480 struct macvlan_port *port = vlan->port;
481
482 free_percpu(vlan->pcpu_stats);
483
484 port->count -= 1;
485 if (!port->count)
486 macvlan_port_destroy(port->dev);
487}
488
489static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
490 struct rtnl_link_stats64 *stats)
491{
492 struct macvlan_dev *vlan = netdev_priv(dev);
493
494 if (vlan->pcpu_stats) {
495 struct macvlan_pcpu_stats *p;
496 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
497 u32 rx_errors = 0, tx_dropped = 0;
498 unsigned int start;
499 int i;
500
501 for_each_possible_cpu(i) {
502 p = per_cpu_ptr(vlan->pcpu_stats, i);
503 do {
504 start = u64_stats_fetch_begin_bh(&p->syncp);
505 rx_packets = p->rx_packets;
506 rx_bytes = p->rx_bytes;
507 rx_multicast = p->rx_multicast;
508 tx_packets = p->tx_packets;
509 tx_bytes = p->tx_bytes;
510 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
511
512 stats->rx_packets += rx_packets;
513 stats->rx_bytes += rx_bytes;
514 stats->multicast += rx_multicast;
515 stats->tx_packets += tx_packets;
516 stats->tx_bytes += tx_bytes;
517 /* rx_errors & tx_dropped are u32, updated
518 * without syncp protection.
519 */
520 rx_errors += p->rx_errors;
521 tx_dropped += p->tx_dropped;
522 }
523 stats->rx_errors = rx_errors;
524 stats->rx_dropped = rx_errors;
525 stats->tx_dropped = tx_dropped;
526 }
527 return stats;
528}
529
530static int macvlan_vlan_rx_add_vid(struct net_device *dev,
531 unsigned short vid)
532{
533 struct macvlan_dev *vlan = netdev_priv(dev);
534 struct net_device *lowerdev = vlan->lowerdev;
535
536 return vlan_vid_add(lowerdev, vid);
537}
538
539static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
540 unsigned short vid)
541{
542 struct macvlan_dev *vlan = netdev_priv(dev);
543 struct net_device *lowerdev = vlan->lowerdev;
544
545 vlan_vid_del(lowerdev, vid);
546 return 0;
547}
548
549static int macvlan_fdb_add(struct ndmsg *ndm,
550 struct net_device *dev,
551 unsigned char *addr,
552 u16 flags)
553{
554 struct macvlan_dev *vlan = netdev_priv(dev);
555 int err = -EINVAL;
556
557 if (!vlan->port->passthru)
558 return -EOPNOTSUPP;
559
560 if (is_unicast_ether_addr(addr))
561 err = dev_uc_add_excl(dev, addr);
562 else if (is_multicast_ether_addr(addr))
563 err = dev_mc_add_excl(dev, addr);
564
565 return err;
566}
567
568static int macvlan_fdb_del(struct ndmsg *ndm,
569 struct net_device *dev,
570 unsigned char *addr)
571{
572 struct macvlan_dev *vlan = netdev_priv(dev);
573 int err = -EINVAL;
574
575 if (!vlan->port->passthru)
576 return -EOPNOTSUPP;
577
578 if (is_unicast_ether_addr(addr))
579 err = dev_uc_del(dev, addr);
580 else if (is_multicast_ether_addr(addr))
581 err = dev_mc_del(dev, addr);
582
583 return err;
584}
585
586static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
587 struct ethtool_drvinfo *drvinfo)
588{
589 snprintf(drvinfo->driver, 32, "macvlan");
590 snprintf(drvinfo->version, 32, "0.1");
591}
592
593static int macvlan_ethtool_get_settings(struct net_device *dev,
594 struct ethtool_cmd *cmd)
595{
596 const struct macvlan_dev *vlan = netdev_priv(dev);
597
598 return __ethtool_get_settings(vlan->lowerdev, cmd);
599}
600
601static const struct ethtool_ops macvlan_ethtool_ops = {
602 .get_link = ethtool_op_get_link,
603 .get_settings = macvlan_ethtool_get_settings,
604 .get_drvinfo = macvlan_ethtool_get_drvinfo,
605};
606
607static const struct net_device_ops macvlan_netdev_ops = {
608 .ndo_init = macvlan_init,
609 .ndo_uninit = macvlan_uninit,
610 .ndo_open = macvlan_open,
611 .ndo_stop = macvlan_stop,
612 .ndo_start_xmit = macvlan_start_xmit,
613 .ndo_change_mtu = macvlan_change_mtu,
614 .ndo_change_rx_flags = macvlan_change_rx_flags,
615 .ndo_set_mac_address = macvlan_set_mac_address,
616 .ndo_set_rx_mode = macvlan_set_mac_lists,
617 .ndo_get_stats64 = macvlan_dev_get_stats64,
618 .ndo_validate_addr = eth_validate_addr,
619 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
620 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
621 .ndo_fdb_add = macvlan_fdb_add,
622 .ndo_fdb_del = macvlan_fdb_del,
623 .ndo_fdb_dump = ndo_dflt_fdb_dump,
624};
625
626void macvlan_common_setup(struct net_device *dev)
627{
628 ether_setup(dev);
629
630 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
631 dev->netdev_ops = &macvlan_netdev_ops;
632 dev->destructor = free_netdev;
633 dev->header_ops = &macvlan_hard_header_ops,
634 dev->ethtool_ops = &macvlan_ethtool_ops;
635}
636EXPORT_SYMBOL_GPL(macvlan_common_setup);
637
638static void macvlan_setup(struct net_device *dev)
639{
640 macvlan_common_setup(dev);
641 dev->tx_queue_len = 0;
642}
643
644static int macvlan_port_create(struct net_device *dev)
645{
646 struct macvlan_port *port;
647 unsigned int i;
648 int err;
649
650 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
651 return -EINVAL;
652
653 port = kzalloc(sizeof(*port), GFP_KERNEL);
654 if (port == NULL)
655 return -ENOMEM;
656
657 port->passthru = false;
658 port->dev = dev;
659 INIT_LIST_HEAD(&port->vlans);
660 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
661 INIT_HLIST_HEAD(&port->vlan_hash[i]);
662
663 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
664 if (err)
665 kfree(port);
666 else
667 dev->priv_flags |= IFF_MACVLAN_PORT;
668 return err;
669}
670
671static void macvlan_port_destroy(struct net_device *dev)
672{
673 struct macvlan_port *port = macvlan_port_get(dev);
674
675 dev->priv_flags &= ~IFF_MACVLAN_PORT;
676 netdev_rx_handler_unregister(dev);
677 kfree_rcu(port, rcu);
678}
679
680static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
681{
682 if (tb[IFLA_ADDRESS]) {
683 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
684 return -EINVAL;
685 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
686 return -EADDRNOTAVAIL;
687 }
688
689 if (data && data[IFLA_MACVLAN_MODE]) {
690 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
691 case MACVLAN_MODE_PRIVATE:
692 case MACVLAN_MODE_VEPA:
693 case MACVLAN_MODE_BRIDGE:
694 case MACVLAN_MODE_PASSTHRU:
695 break;
696 default:
697 return -EINVAL;
698 }
699 }
700 return 0;
701}
702
703int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
704 struct nlattr *tb[], struct nlattr *data[],
705 int (*receive)(struct sk_buff *skb),
706 int (*forward)(struct net_device *dev,
707 struct sk_buff *skb))
708{
709 struct macvlan_dev *vlan = netdev_priv(dev);
710 struct macvlan_port *port;
711 struct net_device *lowerdev;
712 int err;
713
714 if (!tb[IFLA_LINK])
715 return -EINVAL;
716
717 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
718 if (lowerdev == NULL)
719 return -ENODEV;
720
721 /* When creating macvlans on top of other macvlans - use
722 * the real device as the lowerdev.
723 */
724 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
725 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
726 lowerdev = lowervlan->lowerdev;
727 }
728
729 if (!tb[IFLA_MTU])
730 dev->mtu = lowerdev->mtu;
731 else if (dev->mtu > lowerdev->mtu)
732 return -EINVAL;
733
734 if (!tb[IFLA_ADDRESS])
735 eth_hw_addr_random(dev);
736
737 if (!macvlan_port_exists(lowerdev)) {
738 err = macvlan_port_create(lowerdev);
739 if (err < 0)
740 return err;
741 }
742 port = macvlan_port_get(lowerdev);
743
744 /* Only 1 macvlan device can be created in passthru mode */
745 if (port->passthru)
746 return -EINVAL;
747
748 vlan->lowerdev = lowerdev;
749 vlan->dev = dev;
750 vlan->port = port;
751 vlan->receive = receive;
752 vlan->forward = forward;
753
754 vlan->mode = MACVLAN_MODE_VEPA;
755 if (data && data[IFLA_MACVLAN_MODE])
756 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
757
758 if (data && data[IFLA_MACVLAN_FLAGS])
759 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
760
761 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
762 if (port->count)
763 return -EINVAL;
764 port->passthru = true;
765 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
766 }
767
768 port->count += 1;
769 err = register_netdevice(dev);
770 if (err < 0)
771 goto destroy_port;
772
773 list_add_tail(&vlan->list, &port->vlans);
774 netif_stacked_transfer_operstate(lowerdev, dev);
775
776 return 0;
777
778destroy_port:
779 port->count -= 1;
780 if (!port->count)
781 macvlan_port_destroy(lowerdev);
782
783 return err;
784}
785EXPORT_SYMBOL_GPL(macvlan_common_newlink);
786
787static int macvlan_newlink(struct net *src_net, struct net_device *dev,
788 struct nlattr *tb[], struct nlattr *data[])
789{
790 return macvlan_common_newlink(src_net, dev, tb, data,
791 netif_rx,
792 dev_forward_skb);
793}
794
795void macvlan_dellink(struct net_device *dev, struct list_head *head)
796{
797 struct macvlan_dev *vlan = netdev_priv(dev);
798
799 list_del(&vlan->list);
800 unregister_netdevice_queue(dev, head);
801}
802EXPORT_SYMBOL_GPL(macvlan_dellink);
803
804static int macvlan_changelink(struct net_device *dev,
805 struct nlattr *tb[], struct nlattr *data[])
806{
807 struct macvlan_dev *vlan = netdev_priv(dev);
808 if (data && data[IFLA_MACVLAN_MODE])
809 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
810 if (data && data[IFLA_MACVLAN_FLAGS]) {
811 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
812 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
813
814 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
815 dev_set_promiscuity(vlan->lowerdev, -1);
816 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
817 dev_set_promiscuity(vlan->lowerdev, 1);
818 vlan->flags = flags;
819 }
820 return 0;
821}
822
823static size_t macvlan_get_size(const struct net_device *dev)
824{
825 return nla_total_size(4);
826}
827
828static int macvlan_fill_info(struct sk_buff *skb,
829 const struct net_device *dev)
830{
831 struct macvlan_dev *vlan = netdev_priv(dev);
832
833 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
834 goto nla_put_failure;
835 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
836 goto nla_put_failure;
837 return 0;
838
839nla_put_failure:
840 return -EMSGSIZE;
841}
842
843static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
844 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
845 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
846};
847
848int macvlan_link_register(struct rtnl_link_ops *ops)
849{
850 /* common fields */
851 ops->priv_size = sizeof(struct macvlan_dev);
852 ops->validate = macvlan_validate;
853 ops->maxtype = IFLA_MACVLAN_MAX;
854 ops->policy = macvlan_policy;
855 ops->changelink = macvlan_changelink;
856 ops->get_size = macvlan_get_size;
857 ops->fill_info = macvlan_fill_info;
858
859 return rtnl_link_register(ops);
860};
861EXPORT_SYMBOL_GPL(macvlan_link_register);
862
863static struct rtnl_link_ops macvlan_link_ops = {
864 .kind = "macvlan",
865 .setup = macvlan_setup,
866 .newlink = macvlan_newlink,
867 .dellink = macvlan_dellink,
868};
869
870static int macvlan_device_event(struct notifier_block *unused,
871 unsigned long event, void *ptr)
872{
873 struct net_device *dev = ptr;
874 struct macvlan_dev *vlan, *next;
875 struct macvlan_port *port;
876 LIST_HEAD(list_kill);
877
878 if (!macvlan_port_exists(dev))
879 return NOTIFY_DONE;
880
881 port = macvlan_port_get(dev);
882
883 switch (event) {
884 case NETDEV_CHANGE:
885 list_for_each_entry(vlan, &port->vlans, list)
886 netif_stacked_transfer_operstate(vlan->lowerdev,
887 vlan->dev);
888 break;
889 case NETDEV_FEAT_CHANGE:
890 list_for_each_entry(vlan, &port->vlans, list) {
891 vlan->dev->features = dev->features & MACVLAN_FEATURES;
892 vlan->dev->gso_max_size = dev->gso_max_size;
893 netdev_features_change(vlan->dev);
894 }
895 break;
896 case NETDEV_UNREGISTER:
897 /* twiddle thumbs on netns device moves */
898 if (dev->reg_state != NETREG_UNREGISTERING)
899 break;
900
901 list_for_each_entry_safe(vlan, next, &port->vlans, list)
902 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
903 unregister_netdevice_many(&list_kill);
904 list_del(&list_kill);
905 break;
906 case NETDEV_PRE_TYPE_CHANGE:
907 /* Forbid underlaying device to change its type. */
908 return NOTIFY_BAD;
909 }
910 return NOTIFY_DONE;
911}
912
913static struct notifier_block macvlan_notifier_block __read_mostly = {
914 .notifier_call = macvlan_device_event,
915};
916
917static int __init macvlan_init_module(void)
918{
919 int err;
920
921 register_netdevice_notifier(&macvlan_notifier_block);
922
923 err = macvlan_link_register(&macvlan_link_ops);
924 if (err < 0)
925 goto err1;
926 return 0;
927err1:
928 unregister_netdevice_notifier(&macvlan_notifier_block);
929 return err;
930}
931
932static void __exit macvlan_cleanup_module(void)
933{
934 rtnl_link_unregister(&macvlan_link_ops);
935 unregister_netdevice_notifier(&macvlan_notifier_block);
936}
937
938module_init(macvlan_init_module);
939module_exit(macvlan_cleanup_module);
940
941MODULE_LICENSE("GPL");
942MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
943MODULE_DESCRIPTION("Driver for MAC address based VLANs");
944MODULE_ALIAS_RTNL_LINK("macvlan");