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_DEFAULT_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 bc_queue_len_used;
50 int bc_cutoff;
51 u32 flags;
52 int count;
53 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
54 DECLARE_BITMAP(bc_filter, MACVLAN_MC_FILTER_SZ);
55 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
56 unsigned char perm_addr[ETH_ALEN];
57};
58
59struct macvlan_source_entry {
60 struct hlist_node hlist;
61 struct macvlan_dev *vlan;
62 unsigned char addr[6+2] __aligned(sizeof(u16));
63 struct rcu_head rcu;
64};
65
66struct macvlan_skb_cb {
67 const struct macvlan_dev *src;
68};
69
70#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
71
72static void macvlan_port_destroy(struct net_device *dev);
73static void update_port_bc_queue_len(struct macvlan_port *port);
74
75static inline bool macvlan_passthru(const struct macvlan_port *port)
76{
77 return port->flags & MACVLAN_F_PASSTHRU;
78}
79
80static inline void macvlan_set_passthru(struct macvlan_port *port)
81{
82 port->flags |= MACVLAN_F_PASSTHRU;
83}
84
85static inline bool macvlan_addr_change(const struct macvlan_port *port)
86{
87 return port->flags & MACVLAN_F_ADDRCHANGE;
88}
89
90static inline void macvlan_set_addr_change(struct macvlan_port *port)
91{
92 port->flags |= MACVLAN_F_ADDRCHANGE;
93}
94
95static inline void macvlan_clear_addr_change(struct macvlan_port *port)
96{
97 port->flags &= ~MACVLAN_F_ADDRCHANGE;
98}
99
100/* Hash Ethernet address */
101static u32 macvlan_eth_hash(const unsigned char *addr)
102{
103 u64 value = get_unaligned((u64 *)addr);
104
105 /* only want 6 bytes */
106#ifdef __BIG_ENDIAN
107 value >>= 16;
108#else
109 value <<= 16;
110#endif
111 return hash_64(val: value, MACVLAN_HASH_BITS);
112}
113
114static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
115{
116 return rcu_dereference(dev->rx_handler_data);
117}
118
119static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
120{
121 return rtnl_dereference(dev->rx_handler_data);
122}
123
124static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
125 const unsigned char *addr)
126{
127 struct macvlan_dev *vlan;
128 u32 idx = macvlan_eth_hash(addr);
129
130 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
131 lockdep_rtnl_is_held()) {
132 if (ether_addr_equal_64bits(addr1: vlan->dev->dev_addr, addr2: addr))
133 return vlan;
134 }
135 return NULL;
136}
137
138static struct macvlan_source_entry *macvlan_hash_lookup_source(
139 const struct macvlan_dev *vlan,
140 const unsigned char *addr)
141{
142 struct macvlan_source_entry *entry;
143 u32 idx = macvlan_eth_hash(addr);
144 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
145
146 hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
147 if (ether_addr_equal_64bits(addr1: entry->addr, addr2: addr) &&
148 entry->vlan == vlan)
149 return entry;
150 }
151 return NULL;
152}
153
154static int macvlan_hash_add_source(struct macvlan_dev *vlan,
155 const unsigned char *addr)
156{
157 struct macvlan_port *port = vlan->port;
158 struct macvlan_source_entry *entry;
159 struct hlist_head *h;
160
161 entry = macvlan_hash_lookup_source(vlan, addr);
162 if (entry)
163 return 0;
164
165 entry = kmalloc(size: sizeof(*entry), GFP_KERNEL);
166 if (!entry)
167 return -ENOMEM;
168
169 ether_addr_copy(dst: entry->addr, src: addr);
170 entry->vlan = vlan;
171 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
172 hlist_add_head_rcu(n: &entry->hlist, h);
173 vlan->macaddr_count++;
174
175 return 0;
176}
177
178static void macvlan_hash_add(struct macvlan_dev *vlan)
179{
180 struct macvlan_port *port = vlan->port;
181 const unsigned char *addr = vlan->dev->dev_addr;
182 u32 idx = macvlan_eth_hash(addr);
183
184 hlist_add_head_rcu(n: &vlan->hlist, h: &port->vlan_hash[idx]);
185}
186
187static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
188{
189 hlist_del_rcu(n: &entry->hlist);
190 kfree_rcu(entry, rcu);
191}
192
193static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
194{
195 hlist_del_rcu(n: &vlan->hlist);
196 if (sync)
197 synchronize_rcu();
198}
199
200static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
201 const unsigned char *addr)
202{
203 macvlan_hash_del(vlan, sync: true);
204 /* Now that we are unhashed it is safe to change the device
205 * address without confusing packet delivery.
206 */
207 eth_hw_addr_set(dev: vlan->dev, addr);
208 macvlan_hash_add(vlan);
209}
210
211static bool macvlan_addr_busy(const struct macvlan_port *port,
212 const unsigned char *addr)
213{
214 /* Test to see if the specified address is
215 * currently in use by the underlying device or
216 * another macvlan.
217 */
218 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
219 ether_addr_equal_64bits(addr1: port->dev->dev_addr, addr2: addr))
220 return true;
221
222 if (macvlan_hash_lookup(port, addr))
223 return true;
224
225 return false;
226}
227
228
229static int macvlan_broadcast_one(struct sk_buff *skb,
230 const struct macvlan_dev *vlan,
231 const struct ethhdr *eth, bool local)
232{
233 struct net_device *dev = vlan->dev;
234
235 if (local)
236 return __dev_forward_skb(dev, skb);
237
238 skb->dev = dev;
239 if (ether_addr_equal_64bits(addr1: eth->h_dest, addr2: dev->broadcast))
240 skb->pkt_type = PACKET_BROADCAST;
241 else
242 skb->pkt_type = PACKET_MULTICAST;
243
244 return 0;
245}
246
247static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
248{
249 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
250}
251
252
253static unsigned int mc_hash(const struct macvlan_dev *vlan,
254 const unsigned char *addr)
255{
256 u32 val = __get_unaligned_cpu32(p: addr + 2);
257
258 val ^= macvlan_hash_mix(vlan);
259 return hash_32(val, MACVLAN_MC_FILTER_BITS);
260}
261
262static void macvlan_broadcast(struct sk_buff *skb,
263 const struct macvlan_port *port,
264 struct net_device *src,
265 enum macvlan_mode mode)
266{
267 const struct ethhdr *eth = eth_hdr(skb);
268 const struct macvlan_dev *vlan;
269 struct sk_buff *nskb;
270 unsigned int i;
271 int err;
272 unsigned int hash;
273
274 if (skb->protocol == htons(ETH_P_PAUSE))
275 return;
276
277 hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) {
278 if (vlan->dev == src || !(vlan->mode & mode))
279 continue;
280
281 hash = mc_hash(vlan, addr: eth->h_dest);
282 if (!test_bit(hash, vlan->mc_filter))
283 continue;
284
285 err = NET_RX_DROP;
286 nskb = skb_clone(skb, GFP_ATOMIC);
287 if (likely(nskb))
288 err = macvlan_broadcast_one(skb: nskb, vlan, eth,
289 local: mode == MACVLAN_MODE_BRIDGE) ?:
290 netif_rx(skb: nskb);
291 macvlan_count_rx(vlan, len: skb->len + ETH_HLEN,
292 success: err == NET_RX_SUCCESS, multicast: true);
293 }
294}
295
296static void macvlan_multicast_rx(const struct macvlan_port *port,
297 const struct macvlan_dev *src,
298 struct sk_buff *skb)
299{
300 if (!src)
301 /* frame comes from an external address */
302 macvlan_broadcast(skb, port, NULL,
303 mode: MACVLAN_MODE_PRIVATE |
304 MACVLAN_MODE_VEPA |
305 MACVLAN_MODE_PASSTHRU|
306 MACVLAN_MODE_BRIDGE);
307 else if (src->mode == MACVLAN_MODE_VEPA)
308 /* flood to everyone except source */
309 macvlan_broadcast(skb, port, src: src->dev,
310 mode: MACVLAN_MODE_VEPA |
311 MACVLAN_MODE_BRIDGE);
312 else
313 /*
314 * flood only to VEPA ports, bridge ports
315 * already saw the frame on the way out.
316 */
317 macvlan_broadcast(skb, port, src: src->dev,
318 mode: MACVLAN_MODE_VEPA);
319}
320
321static void macvlan_process_broadcast(struct work_struct *w)
322{
323 struct macvlan_port *port = container_of(w, struct macvlan_port,
324 bc_work);
325 struct sk_buff *skb;
326 struct sk_buff_head list;
327
328 __skb_queue_head_init(list: &list);
329
330 spin_lock_bh(lock: &port->bc_queue.lock);
331 skb_queue_splice_tail_init(list: &port->bc_queue, head: &list);
332 spin_unlock_bh(lock: &port->bc_queue.lock);
333
334 while ((skb = __skb_dequeue(list: &list))) {
335 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
336
337 rcu_read_lock();
338 macvlan_multicast_rx(port, src, skb);
339 rcu_read_unlock();
340
341 if (src)
342 dev_put(dev: src->dev);
343 consume_skb(skb);
344
345 cond_resched();
346 }
347}
348
349static void macvlan_broadcast_enqueue(struct macvlan_port *port,
350 const struct macvlan_dev *src,
351 struct sk_buff *skb)
352{
353 struct sk_buff *nskb;
354 int err = -ENOMEM;
355
356 nskb = skb_clone(skb, GFP_ATOMIC);
357 if (!nskb)
358 goto err;
359
360 MACVLAN_SKB_CB(nskb)->src = src;
361
362 spin_lock(lock: &port->bc_queue.lock);
363 if (skb_queue_len(list_: &port->bc_queue) < port->bc_queue_len_used) {
364 if (src)
365 dev_hold(dev: src->dev);
366 __skb_queue_tail(list: &port->bc_queue, newsk: nskb);
367 err = 0;
368 }
369 spin_unlock(lock: &port->bc_queue.lock);
370
371 queue_work(wq: system_unbound_wq, work: &port->bc_work);
372
373 if (err)
374 goto free_nskb;
375
376 return;
377
378free_nskb:
379 kfree_skb(skb: nskb);
380err:
381 dev_core_stats_rx_dropped_inc(dev: skb->dev);
382}
383
384static void macvlan_flush_sources(struct macvlan_port *port,
385 struct macvlan_dev *vlan)
386{
387 struct macvlan_source_entry *entry;
388 struct hlist_node *next;
389 int i;
390
391 hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist)
392 if (entry->vlan == vlan)
393 macvlan_hash_del_source(entry);
394
395 vlan->macaddr_count = 0;
396}
397
398static void macvlan_forward_source_one(struct sk_buff *skb,
399 struct macvlan_dev *vlan)
400{
401 struct sk_buff *nskb;
402 struct net_device *dev;
403 int len;
404 int ret;
405
406 dev = vlan->dev;
407 if (unlikely(!(dev->flags & IFF_UP)))
408 return;
409
410 nskb = skb_clone(skb, GFP_ATOMIC);
411 if (!nskb)
412 return;
413
414 len = nskb->len + ETH_HLEN;
415 nskb->dev = dev;
416
417 if (ether_addr_equal_64bits(addr1: eth_hdr(skb)->h_dest, addr2: dev->dev_addr))
418 nskb->pkt_type = PACKET_HOST;
419
420 ret = __netif_rx(skb: nskb);
421 macvlan_count_rx(vlan, len, success: ret == NET_RX_SUCCESS, multicast: false);
422}
423
424static bool macvlan_forward_source(struct sk_buff *skb,
425 struct macvlan_port *port,
426 const unsigned char *addr)
427{
428 struct macvlan_source_entry *entry;
429 u32 idx = macvlan_eth_hash(addr);
430 struct hlist_head *h = &port->vlan_source_hash[idx];
431 bool consume = false;
432
433 hlist_for_each_entry_rcu(entry, h, hlist) {
434 if (ether_addr_equal_64bits(addr1: entry->addr, addr2: addr)) {
435 if (entry->vlan->flags & MACVLAN_FLAG_NODST)
436 consume = true;
437 macvlan_forward_source_one(skb, vlan: entry->vlan);
438 }
439 }
440
441 return consume;
442}
443
444/* called under rcu_read_lock() from netif_receive_skb */
445static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
446{
447 struct macvlan_port *port;
448 struct sk_buff *skb = *pskb;
449 const struct ethhdr *eth = eth_hdr(skb);
450 const struct macvlan_dev *vlan;
451 const struct macvlan_dev *src;
452 struct net_device *dev;
453 unsigned int len = 0;
454 int ret;
455 rx_handler_result_t handle_res;
456
457 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
458 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
459 return RX_HANDLER_PASS;
460
461 port = macvlan_port_get_rcu(dev: skb->dev);
462 if (is_multicast_ether_addr(addr: eth->h_dest)) {
463 unsigned int hash;
464
465 skb = ip_check_defrag(net: dev_net(dev: skb->dev), skb, user: IP_DEFRAG_MACVLAN);
466 if (!skb)
467 return RX_HANDLER_CONSUMED;
468 *pskb = skb;
469 eth = eth_hdr(skb);
470 if (macvlan_forward_source(skb, port, addr: eth->h_source)) {
471 kfree_skb(skb);
472 return RX_HANDLER_CONSUMED;
473 }
474 src = macvlan_hash_lookup(port, addr: eth->h_source);
475 if (src && src->mode != MACVLAN_MODE_VEPA &&
476 src->mode != MACVLAN_MODE_BRIDGE) {
477 /* forward to original port. */
478 vlan = src;
479 ret = macvlan_broadcast_one(skb, vlan, eth, local: 0) ?:
480 __netif_rx(skb);
481 handle_res = RX_HANDLER_CONSUMED;
482 goto out;
483 }
484
485 hash = mc_hash(NULL, addr: eth->h_dest);
486 if (test_bit(hash, port->bc_filter))
487 macvlan_broadcast_enqueue(port, src, skb);
488 else if (test_bit(hash, port->mc_filter))
489 macvlan_multicast_rx(port, src, skb);
490
491 return RX_HANDLER_PASS;
492 }
493
494 if (macvlan_forward_source(skb, port, addr: eth->h_source)) {
495 kfree_skb(skb);
496 return RX_HANDLER_CONSUMED;
497 }
498 if (macvlan_passthru(port))
499 vlan = list_first_or_null_rcu(&port->vlans,
500 struct macvlan_dev, list);
501 else
502 vlan = macvlan_hash_lookup(port, addr: eth->h_dest);
503 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
504 return RX_HANDLER_PASS;
505
506 dev = vlan->dev;
507 if (unlikely(!(dev->flags & IFF_UP))) {
508 kfree_skb(skb);
509 return RX_HANDLER_CONSUMED;
510 }
511 len = skb->len + ETH_HLEN;
512 skb = skb_share_check(skb, GFP_ATOMIC);
513 if (!skb) {
514 ret = NET_RX_DROP;
515 handle_res = RX_HANDLER_CONSUMED;
516 goto out;
517 }
518
519 *pskb = skb;
520 skb->dev = dev;
521 skb->pkt_type = PACKET_HOST;
522
523 ret = NET_RX_SUCCESS;
524 handle_res = RX_HANDLER_ANOTHER;
525out:
526 macvlan_count_rx(vlan, len, success: ret == NET_RX_SUCCESS, multicast: false);
527 return handle_res;
528}
529
530static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
531{
532 const struct macvlan_dev *vlan = netdev_priv(dev);
533 const struct macvlan_port *port = vlan->port;
534 const struct macvlan_dev *dest;
535
536 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
537 const struct ethhdr *eth = skb_eth_hdr(skb);
538
539 /* send to other bridge ports directly */
540 if (is_multicast_ether_addr(addr: eth->h_dest)) {
541 skb_reset_mac_header(skb);
542 macvlan_broadcast(skb, port, src: dev, mode: MACVLAN_MODE_BRIDGE);
543 goto xmit_world;
544 }
545
546 dest = macvlan_hash_lookup(port, addr: eth->h_dest);
547 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
548 /* send to lowerdev first for its network taps */
549 dev_forward_skb(dev: vlan->lowerdev, skb);
550
551 return NET_XMIT_SUCCESS;
552 }
553 }
554xmit_world:
555 skb->dev = vlan->lowerdev;
556 return dev_queue_xmit_accel(skb,
557 sb_dev: netdev_get_sb_channel(dev) ? dev : NULL);
558}
559
560static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
561{
562#ifdef CONFIG_NET_POLL_CONTROLLER
563 return netpoll_send_skb(np: vlan->netpoll, skb);
564#else
565 BUG();
566 return NETDEV_TX_OK;
567#endif
568}
569
570static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
571 struct net_device *dev)
572{
573 struct macvlan_dev *vlan = netdev_priv(dev);
574 unsigned int len = skb->len;
575 int ret;
576
577 if (unlikely(netpoll_tx_running(dev)))
578 return macvlan_netpoll_send_skb(vlan, skb);
579
580 ret = macvlan_queue_xmit(skb, dev);
581
582 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
583 struct vlan_pcpu_stats *pcpu_stats;
584
585 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
586 u64_stats_update_begin(syncp: &pcpu_stats->syncp);
587 u64_stats_inc(p: &pcpu_stats->tx_packets);
588 u64_stats_add(p: &pcpu_stats->tx_bytes, val: len);
589 u64_stats_update_end(syncp: &pcpu_stats->syncp);
590 } else {
591 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
592 }
593 return ret;
594}
595
596static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
597 unsigned short type, const void *daddr,
598 const void *saddr, unsigned len)
599{
600 const struct macvlan_dev *vlan = netdev_priv(dev);
601 struct net_device *lowerdev = vlan->lowerdev;
602
603 return dev_hard_header(skb, dev: lowerdev, type, daddr,
604 saddr: saddr ? : dev->dev_addr, len);
605}
606
607static const struct header_ops macvlan_hard_header_ops = {
608 .create = macvlan_hard_header,
609 .parse = eth_header_parse,
610 .cache = eth_header_cache,
611 .cache_update = eth_header_cache_update,
612};
613
614static int macvlan_open(struct net_device *dev)
615{
616 struct macvlan_dev *vlan = netdev_priv(dev);
617 struct net_device *lowerdev = vlan->lowerdev;
618 int err;
619
620 if (macvlan_passthru(port: vlan->port)) {
621 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
622 err = dev_set_promiscuity(dev: lowerdev, inc: 1);
623 if (err < 0)
624 goto out;
625 }
626 goto hash_add;
627 }
628
629 err = -EADDRINUSE;
630 if (macvlan_addr_busy(port: vlan->port, addr: dev->dev_addr))
631 goto out;
632
633 /* Attempt to populate accel_priv which is used to offload the L2
634 * forwarding requests for unicast packets.
635 */
636 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
637 vlan->accel_priv =
638 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
639
640 /* If earlier attempt to offload failed, or accel_priv is not
641 * populated we must add the unicast address to the lower device.
642 */
643 if (IS_ERR_OR_NULL(ptr: vlan->accel_priv)) {
644 vlan->accel_priv = NULL;
645 err = dev_uc_add(dev: lowerdev, addr: dev->dev_addr);
646 if (err < 0)
647 goto out;
648 }
649
650 if (dev->flags & IFF_ALLMULTI) {
651 err = dev_set_allmulti(dev: lowerdev, inc: 1);
652 if (err < 0)
653 goto del_unicast;
654 }
655
656 if (dev->flags & IFF_PROMISC) {
657 err = dev_set_promiscuity(dev: lowerdev, inc: 1);
658 if (err < 0)
659 goto clear_multi;
660 }
661
662hash_add:
663 macvlan_hash_add(vlan);
664 return 0;
665
666clear_multi:
667 if (dev->flags & IFF_ALLMULTI)
668 dev_set_allmulti(dev: lowerdev, inc: -1);
669del_unicast:
670 if (vlan->accel_priv) {
671 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
672 vlan->accel_priv);
673 vlan->accel_priv = NULL;
674 } else {
675 dev_uc_del(dev: lowerdev, addr: dev->dev_addr);
676 }
677out:
678 return err;
679}
680
681static int macvlan_stop(struct net_device *dev)
682{
683 struct macvlan_dev *vlan = netdev_priv(dev);
684 struct net_device *lowerdev = vlan->lowerdev;
685
686 if (vlan->accel_priv) {
687 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
688 vlan->accel_priv);
689 vlan->accel_priv = NULL;
690 }
691
692 dev_uc_unsync(to: lowerdev, from: dev);
693 dev_mc_unsync(to: lowerdev, from: dev);
694
695 if (macvlan_passthru(port: vlan->port)) {
696 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
697 dev_set_promiscuity(dev: lowerdev, inc: -1);
698 goto hash_del;
699 }
700
701 if (dev->flags & IFF_ALLMULTI)
702 dev_set_allmulti(dev: lowerdev, inc: -1);
703
704 if (dev->flags & IFF_PROMISC)
705 dev_set_promiscuity(dev: lowerdev, inc: -1);
706
707 dev_uc_del(dev: lowerdev, addr: dev->dev_addr);
708
709hash_del:
710 macvlan_hash_del(vlan, sync: !dev->dismantle);
711 return 0;
712}
713
714static int macvlan_sync_address(struct net_device *dev,
715 const unsigned char *addr)
716{
717 struct macvlan_dev *vlan = netdev_priv(dev);
718 struct net_device *lowerdev = vlan->lowerdev;
719 struct macvlan_port *port = vlan->port;
720 int err;
721
722 if (!(dev->flags & IFF_UP)) {
723 /* Just copy in the new address */
724 eth_hw_addr_set(dev, addr);
725 } else {
726 /* Rehash and update the device filters */
727 if (macvlan_addr_busy(port: vlan->port, addr))
728 return -EADDRINUSE;
729
730 if (!macvlan_passthru(port)) {
731 err = dev_uc_add(dev: lowerdev, addr);
732 if (err)
733 return err;
734
735 dev_uc_del(dev: lowerdev, addr: dev->dev_addr);
736 }
737
738 macvlan_hash_change_addr(vlan, addr);
739 }
740 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
741 /* Since addr_change isn't set, we are here due to lower
742 * device change. Save the lower-dev address so we can
743 * restore it later.
744 */
745 ether_addr_copy(dst: vlan->port->perm_addr,
746 src: lowerdev->dev_addr);
747 }
748 macvlan_clear_addr_change(port);
749 return 0;
750}
751
752static int macvlan_set_mac_address(struct net_device *dev, void *p)
753{
754 struct macvlan_dev *vlan = netdev_priv(dev);
755 struct sockaddr *addr = p;
756
757 if (!is_valid_ether_addr(addr: addr->sa_data))
758 return -EADDRNOTAVAIL;
759
760 /* If the addresses are the same, this is a no-op */
761 if (ether_addr_equal(addr1: dev->dev_addr, addr2: addr->sa_data))
762 return 0;
763
764 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
765 macvlan_set_addr_change(port: vlan->port);
766 return dev_set_mac_address(dev: vlan->lowerdev, sa: addr, NULL);
767 }
768
769 if (macvlan_addr_busy(port: vlan->port, addr: addr->sa_data))
770 return -EADDRINUSE;
771
772 return macvlan_sync_address(dev, addr: addr->sa_data);
773}
774
775static void macvlan_change_rx_flags(struct net_device *dev, int change)
776{
777 struct macvlan_dev *vlan = netdev_priv(dev);
778 struct net_device *lowerdev = vlan->lowerdev;
779
780 if (dev->flags & IFF_UP) {
781 if (change & IFF_ALLMULTI)
782 dev_set_allmulti(dev: lowerdev, inc: dev->flags & IFF_ALLMULTI ? 1 : -1);
783 if (change & IFF_PROMISC)
784 dev_set_promiscuity(dev: lowerdev,
785 inc: dev->flags & IFF_PROMISC ? 1 : -1);
786
787 }
788}
789
790static void macvlan_compute_filter(unsigned long *mc_filter,
791 struct net_device *dev,
792 struct macvlan_dev *vlan, int cutoff)
793{
794 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
795 bitmap_fill(dst: mc_filter, MACVLAN_MC_FILTER_SZ);
796 } else {
797 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
798 struct netdev_hw_addr *ha;
799
800 bitmap_zero(dst: filter, MACVLAN_MC_FILTER_SZ);
801 netdev_for_each_mc_addr(ha, dev) {
802 if (!vlan && ha->synced <= cutoff)
803 continue;
804
805 __set_bit(mc_hash(vlan, ha->addr), filter);
806 }
807
808 __set_bit(mc_hash(vlan, dev->broadcast), filter);
809
810 bitmap_copy(dst: mc_filter, src: filter, MACVLAN_MC_FILTER_SZ);
811 }
812}
813
814static void macvlan_recompute_bc_filter(struct macvlan_dev *vlan)
815{
816 if (vlan->port->bc_cutoff < 0) {
817 bitmap_zero(dst: vlan->port->bc_filter, MACVLAN_MC_FILTER_SZ);
818 return;
819 }
820
821 macvlan_compute_filter(mc_filter: vlan->port->bc_filter, dev: vlan->lowerdev, NULL,
822 cutoff: vlan->port->bc_cutoff);
823}
824
825static void macvlan_set_mac_lists(struct net_device *dev)
826{
827 struct macvlan_dev *vlan = netdev_priv(dev);
828
829 macvlan_compute_filter(mc_filter: vlan->mc_filter, dev, vlan, cutoff: 0);
830
831 dev_uc_sync(to: vlan->lowerdev, from: dev);
832 dev_mc_sync(to: vlan->lowerdev, from: dev);
833
834 /* This is slightly inaccurate as we're including the subscription
835 * list of vlan->lowerdev too.
836 *
837 * Bug alert: This only works if everyone has the same broadcast
838 * address as lowerdev. As soon as someone changes theirs this
839 * will break.
840 *
841 * However, this is already broken as when you change your broadcast
842 * address we don't get called.
843 *
844 * The solution is to maintain a list of broadcast addresses like
845 * we do for uc/mc, if you care.
846 */
847 macvlan_compute_filter(mc_filter: vlan->port->mc_filter, dev: vlan->lowerdev, NULL,
848 cutoff: 0);
849 macvlan_recompute_bc_filter(vlan);
850}
851
852static void update_port_bc_cutoff(struct macvlan_dev *vlan, int cutoff)
853{
854 if (vlan->port->bc_cutoff == cutoff)
855 return;
856
857 vlan->port->bc_cutoff = cutoff;
858 macvlan_recompute_bc_filter(vlan);
859}
860
861static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
862{
863 struct macvlan_dev *vlan = netdev_priv(dev);
864
865 if (vlan->lowerdev->mtu < new_mtu)
866 return -EINVAL;
867 dev->mtu = new_mtu;
868 return 0;
869}
870
871static int macvlan_hwtstamp_get(struct net_device *dev,
872 struct kernel_hwtstamp_config *cfg)
873{
874 struct net_device *real_dev = macvlan_dev_real_dev(dev);
875
876 return generic_hwtstamp_get_lower(dev: real_dev, kernel_cfg: cfg);
877}
878
879static int macvlan_hwtstamp_set(struct net_device *dev,
880 struct kernel_hwtstamp_config *cfg,
881 struct netlink_ext_ack *extack)
882{
883 struct net_device *real_dev = macvlan_dev_real_dev(dev);
884
885 if (!net_eq(net1: dev_net(dev), net2: &init_net))
886 return -EOPNOTSUPP;
887
888 return generic_hwtstamp_set_lower(dev: real_dev, kernel_cfg: cfg, extack);
889}
890
891/*
892 * macvlan network devices have devices nesting below it and are a special
893 * "super class" of normal network devices; split their locks off into a
894 * separate class since they always nest.
895 */
896static struct lock_class_key macvlan_netdev_addr_lock_key;
897
898#define ALWAYS_ON_OFFLOADS \
899 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
900 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
901
902#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
903
904#define MACVLAN_FEATURES \
905 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
906 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
907 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
908 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
909
910#define MACVLAN_STATE_MASK \
911 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
912
913static void macvlan_set_lockdep_class(struct net_device *dev)
914{
915 netdev_lockdep_set_classes(dev);
916 lockdep_set_class(&dev->addr_list_lock,
917 &macvlan_netdev_addr_lock_key);
918}
919
920static int macvlan_init(struct net_device *dev)
921{
922 struct macvlan_dev *vlan = netdev_priv(dev);
923 struct net_device *lowerdev = vlan->lowerdev;
924 struct macvlan_port *port = vlan->port;
925
926 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
927 (lowerdev->state & MACVLAN_STATE_MASK);
928 dev->features = lowerdev->features & MACVLAN_FEATURES;
929 dev->features |= ALWAYS_ON_FEATURES;
930 dev->hw_features |= NETIF_F_LRO;
931 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
932 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
933 dev->hw_enc_features |= dev->features;
934 netif_inherit_tso_max(to: dev, from: lowerdev);
935 dev->hard_header_len = lowerdev->hard_header_len;
936 macvlan_set_lockdep_class(dev);
937
938 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
939 if (!vlan->pcpu_stats)
940 return -ENOMEM;
941
942 port->count += 1;
943
944 /* Get macvlan's reference to lowerdev */
945 netdev_hold(dev: lowerdev, tracker: &vlan->dev_tracker, GFP_KERNEL);
946
947 return 0;
948}
949
950static void macvlan_uninit(struct net_device *dev)
951{
952 struct macvlan_dev *vlan = netdev_priv(dev);
953 struct macvlan_port *port = vlan->port;
954
955 free_percpu(pdata: vlan->pcpu_stats);
956
957 macvlan_flush_sources(port, vlan);
958 port->count -= 1;
959 if (!port->count)
960 macvlan_port_destroy(dev: port->dev);
961}
962
963static void macvlan_dev_get_stats64(struct net_device *dev,
964 struct rtnl_link_stats64 *stats)
965{
966 struct macvlan_dev *vlan = netdev_priv(dev);
967
968 if (vlan->pcpu_stats) {
969 struct vlan_pcpu_stats *p;
970 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
971 u32 rx_errors = 0, tx_dropped = 0;
972 unsigned int start;
973 int i;
974
975 for_each_possible_cpu(i) {
976 p = per_cpu_ptr(vlan->pcpu_stats, i);
977 do {
978 start = u64_stats_fetch_begin(syncp: &p->syncp);
979 rx_packets = u64_stats_read(p: &p->rx_packets);
980 rx_bytes = u64_stats_read(p: &p->rx_bytes);
981 rx_multicast = u64_stats_read(p: &p->rx_multicast);
982 tx_packets = u64_stats_read(p: &p->tx_packets);
983 tx_bytes = u64_stats_read(p: &p->tx_bytes);
984 } while (u64_stats_fetch_retry(syncp: &p->syncp, start));
985
986 stats->rx_packets += rx_packets;
987 stats->rx_bytes += rx_bytes;
988 stats->multicast += rx_multicast;
989 stats->tx_packets += tx_packets;
990 stats->tx_bytes += tx_bytes;
991 /* rx_errors & tx_dropped are u32, updated
992 * without syncp protection.
993 */
994 rx_errors += READ_ONCE(p->rx_errors);
995 tx_dropped += READ_ONCE(p->tx_dropped);
996 }
997 stats->rx_errors = rx_errors;
998 stats->rx_dropped = rx_errors;
999 stats->tx_dropped = tx_dropped;
1000 }
1001}
1002
1003static int macvlan_vlan_rx_add_vid(struct net_device *dev,
1004 __be16 proto, u16 vid)
1005{
1006 struct macvlan_dev *vlan = netdev_priv(dev);
1007 struct net_device *lowerdev = vlan->lowerdev;
1008
1009 return vlan_vid_add(dev: lowerdev, proto, vid);
1010}
1011
1012static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
1013 __be16 proto, u16 vid)
1014{
1015 struct macvlan_dev *vlan = netdev_priv(dev);
1016 struct net_device *lowerdev = vlan->lowerdev;
1017
1018 vlan_vid_del(dev: lowerdev, proto, vid);
1019 return 0;
1020}
1021
1022static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1023 struct net_device *dev,
1024 const unsigned char *addr, u16 vid,
1025 u16 flags,
1026 struct netlink_ext_ack *extack)
1027{
1028 struct macvlan_dev *vlan = netdev_priv(dev);
1029 int err = -EINVAL;
1030
1031 /* Support unicast filter only on passthru devices.
1032 * Multicast filter should be allowed on all devices.
1033 */
1034 if (!macvlan_passthru(port: vlan->port) && is_unicast_ether_addr(addr))
1035 return -EOPNOTSUPP;
1036
1037 if (flags & NLM_F_REPLACE)
1038 return -EOPNOTSUPP;
1039
1040 if (is_unicast_ether_addr(addr))
1041 err = dev_uc_add_excl(dev, addr);
1042 else if (is_multicast_ether_addr(addr))
1043 err = dev_mc_add_excl(dev, addr);
1044
1045 return err;
1046}
1047
1048static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1049 struct net_device *dev,
1050 const unsigned char *addr, u16 vid,
1051 struct netlink_ext_ack *extack)
1052{
1053 struct macvlan_dev *vlan = netdev_priv(dev);
1054 int err = -EINVAL;
1055
1056 /* Support unicast filter only on passthru devices.
1057 * Multicast filter should be allowed on all devices.
1058 */
1059 if (!macvlan_passthru(port: vlan->port) && is_unicast_ether_addr(addr))
1060 return -EOPNOTSUPP;
1061
1062 if (is_unicast_ether_addr(addr))
1063 err = dev_uc_del(dev, addr);
1064 else if (is_multicast_ether_addr(addr))
1065 err = dev_mc_del(dev, addr);
1066
1067 return err;
1068}
1069
1070static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1071 struct ethtool_drvinfo *drvinfo)
1072{
1073 strscpy(p: drvinfo->driver, q: "macvlan", size: sizeof(drvinfo->driver));
1074 strscpy(p: drvinfo->version, q: "0.1", size: sizeof(drvinfo->version));
1075}
1076
1077static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1078 struct ethtool_link_ksettings *cmd)
1079{
1080 const struct macvlan_dev *vlan = netdev_priv(dev);
1081
1082 return __ethtool_get_link_ksettings(dev: vlan->lowerdev, link_ksettings: cmd);
1083}
1084
1085static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1086 struct ethtool_ts_info *info)
1087{
1088 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1089 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1090 struct phy_device *phydev = real_dev->phydev;
1091
1092 if (phy_has_tsinfo(phydev)) {
1093 return phy_ts_info(phydev, tsinfo: info);
1094 } else if (ops->get_ts_info) {
1095 return ops->get_ts_info(real_dev, info);
1096 } else {
1097 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1098 SOF_TIMESTAMPING_SOFTWARE;
1099 info->phc_index = -1;
1100 }
1101
1102 return 0;
1103}
1104
1105static netdev_features_t macvlan_fix_features(struct net_device *dev,
1106 netdev_features_t features)
1107{
1108 struct macvlan_dev *vlan = netdev_priv(dev);
1109 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1110 netdev_features_t mask;
1111
1112 features |= NETIF_F_ALL_FOR_ALL;
1113 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1114 mask = features;
1115
1116 lowerdev_features &= (features | ~NETIF_F_LRO);
1117 features = netdev_increment_features(all: lowerdev_features, one: features, mask);
1118 features |= ALWAYS_ON_FEATURES;
1119 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1120
1121 return features;
1122}
1123
1124#ifdef CONFIG_NET_POLL_CONTROLLER
1125static void macvlan_dev_poll_controller(struct net_device *dev)
1126{
1127 return;
1128}
1129
1130static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1131{
1132 struct macvlan_dev *vlan = netdev_priv(dev);
1133 struct net_device *real_dev = vlan->lowerdev;
1134 struct netpoll *netpoll;
1135 int err;
1136
1137 netpoll = kzalloc(size: sizeof(*netpoll), GFP_KERNEL);
1138 err = -ENOMEM;
1139 if (!netpoll)
1140 goto out;
1141
1142 err = __netpoll_setup(np: netpoll, ndev: real_dev);
1143 if (err) {
1144 kfree(objp: netpoll);
1145 goto out;
1146 }
1147
1148 vlan->netpoll = netpoll;
1149
1150out:
1151 return err;
1152}
1153
1154static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1155{
1156 struct macvlan_dev *vlan = netdev_priv(dev);
1157 struct netpoll *netpoll = vlan->netpoll;
1158
1159 if (!netpoll)
1160 return;
1161
1162 vlan->netpoll = NULL;
1163
1164 __netpoll_free(np: netpoll);
1165}
1166#endif /* CONFIG_NET_POLL_CONTROLLER */
1167
1168static int macvlan_dev_get_iflink(const struct net_device *dev)
1169{
1170 struct macvlan_dev *vlan = netdev_priv(dev);
1171
1172 return vlan->lowerdev->ifindex;
1173}
1174
1175static const struct ethtool_ops macvlan_ethtool_ops = {
1176 .get_link = ethtool_op_get_link,
1177 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1178 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1179 .get_ts_info = macvlan_ethtool_get_ts_info,
1180};
1181
1182static const struct net_device_ops macvlan_netdev_ops = {
1183 .ndo_init = macvlan_init,
1184 .ndo_uninit = macvlan_uninit,
1185 .ndo_open = macvlan_open,
1186 .ndo_stop = macvlan_stop,
1187 .ndo_start_xmit = macvlan_start_xmit,
1188 .ndo_change_mtu = macvlan_change_mtu,
1189 .ndo_fix_features = macvlan_fix_features,
1190 .ndo_change_rx_flags = macvlan_change_rx_flags,
1191 .ndo_set_mac_address = macvlan_set_mac_address,
1192 .ndo_set_rx_mode = macvlan_set_mac_lists,
1193 .ndo_get_stats64 = macvlan_dev_get_stats64,
1194 .ndo_validate_addr = eth_validate_addr,
1195 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1196 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1197 .ndo_fdb_add = macvlan_fdb_add,
1198 .ndo_fdb_del = macvlan_fdb_del,
1199 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1200#ifdef CONFIG_NET_POLL_CONTROLLER
1201 .ndo_poll_controller = macvlan_dev_poll_controller,
1202 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1203 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1204#endif
1205 .ndo_get_iflink = macvlan_dev_get_iflink,
1206 .ndo_features_check = passthru_features_check,
1207 .ndo_hwtstamp_get = macvlan_hwtstamp_get,
1208 .ndo_hwtstamp_set = macvlan_hwtstamp_set,
1209};
1210
1211static void macvlan_dev_free(struct net_device *dev)
1212{
1213 struct macvlan_dev *vlan = netdev_priv(dev);
1214
1215 /* Get rid of the macvlan's reference to lowerdev */
1216 netdev_put(dev: vlan->lowerdev, tracker: &vlan->dev_tracker);
1217}
1218
1219void macvlan_common_setup(struct net_device *dev)
1220{
1221 ether_setup(dev);
1222
1223 /* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */
1224 dev->max_mtu = ETH_MAX_MTU;
1225 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1226 netif_keep_dst(dev);
1227 dev->priv_flags |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN;
1228 dev->netdev_ops = &macvlan_netdev_ops;
1229 dev->needs_free_netdev = true;
1230 dev->priv_destructor = macvlan_dev_free;
1231 dev->header_ops = &macvlan_hard_header_ops;
1232 dev->ethtool_ops = &macvlan_ethtool_ops;
1233}
1234EXPORT_SYMBOL_GPL(macvlan_common_setup);
1235
1236static void macvlan_setup(struct net_device *dev)
1237{
1238 macvlan_common_setup(dev);
1239 dev->priv_flags |= IFF_NO_QUEUE;
1240}
1241
1242static int macvlan_port_create(struct net_device *dev)
1243{
1244 struct macvlan_port *port;
1245 unsigned int i;
1246 int err;
1247
1248 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1249 return -EINVAL;
1250
1251 if (netdev_is_rx_handler_busy(dev))
1252 return -EBUSY;
1253
1254 port = kzalloc(size: sizeof(*port), GFP_KERNEL);
1255 if (port == NULL)
1256 return -ENOMEM;
1257
1258 port->dev = dev;
1259 ether_addr_copy(dst: port->perm_addr, src: dev->dev_addr);
1260 INIT_LIST_HEAD(list: &port->vlans);
1261 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1262 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1263 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1264 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1265
1266 port->bc_queue_len_used = 0;
1267 port->bc_cutoff = 1;
1268 skb_queue_head_init(list: &port->bc_queue);
1269 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1270
1271 err = netdev_rx_handler_register(dev, rx_handler: macvlan_handle_frame, rx_handler_data: port);
1272 if (err)
1273 kfree(objp: port);
1274 else
1275 dev->priv_flags |= IFF_MACVLAN_PORT;
1276 return err;
1277}
1278
1279static void macvlan_port_destroy(struct net_device *dev)
1280{
1281 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1282 struct sk_buff *skb;
1283
1284 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1285 netdev_rx_handler_unregister(dev);
1286
1287 /* After this point, no packet can schedule bc_work anymore,
1288 * but we need to cancel it and purge left skbs if any.
1289 */
1290 cancel_work_sync(work: &port->bc_work);
1291
1292 while ((skb = __skb_dequeue(list: &port->bc_queue))) {
1293 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1294
1295 if (src)
1296 dev_put(dev: src->dev);
1297
1298 kfree_skb(skb);
1299 }
1300
1301 /* If the lower device address has been changed by passthru
1302 * macvlan, put it back.
1303 */
1304 if (macvlan_passthru(port) &&
1305 !ether_addr_equal(addr1: port->dev->dev_addr, addr2: port->perm_addr)) {
1306 struct sockaddr sa;
1307
1308 sa.sa_family = port->dev->type;
1309 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1310 dev_set_mac_address(dev: port->dev, sa: &sa, NULL);
1311 }
1312
1313 kfree(objp: port);
1314}
1315
1316static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1317 struct netlink_ext_ack *extack)
1318{
1319 struct nlattr *nla, *head;
1320 int rem, len;
1321
1322 if (tb[IFLA_ADDRESS]) {
1323 if (nla_len(nla: tb[IFLA_ADDRESS]) != ETH_ALEN)
1324 return -EINVAL;
1325 if (!is_valid_ether_addr(addr: nla_data(nla: tb[IFLA_ADDRESS])))
1326 return -EADDRNOTAVAIL;
1327 }
1328
1329 if (!data)
1330 return 0;
1331
1332 if (data[IFLA_MACVLAN_FLAGS] &&
1333 nla_get_u16(nla: data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1334 MACVLAN_FLAG_NODST))
1335 return -EINVAL;
1336
1337 if (data[IFLA_MACVLAN_MODE]) {
1338 switch (nla_get_u32(nla: data[IFLA_MACVLAN_MODE])) {
1339 case MACVLAN_MODE_PRIVATE:
1340 case MACVLAN_MODE_VEPA:
1341 case MACVLAN_MODE_BRIDGE:
1342 case MACVLAN_MODE_PASSTHRU:
1343 case MACVLAN_MODE_SOURCE:
1344 break;
1345 default:
1346 return -EINVAL;
1347 }
1348 }
1349
1350 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1351 switch (nla_get_u32(nla: data[IFLA_MACVLAN_MACADDR_MODE])) {
1352 case MACVLAN_MACADDR_ADD:
1353 case MACVLAN_MACADDR_DEL:
1354 case MACVLAN_MACADDR_FLUSH:
1355 case MACVLAN_MACADDR_SET:
1356 break;
1357 default:
1358 return -EINVAL;
1359 }
1360 }
1361
1362 if (data[IFLA_MACVLAN_MACADDR]) {
1363 if (nla_len(nla: data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1364 return -EINVAL;
1365
1366 if (!is_valid_ether_addr(addr: nla_data(nla: data[IFLA_MACVLAN_MACADDR])))
1367 return -EADDRNOTAVAIL;
1368 }
1369
1370 if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1371 head = nla_data(nla: data[IFLA_MACVLAN_MACADDR_DATA]);
1372 len = nla_len(nla: data[IFLA_MACVLAN_MACADDR_DATA]);
1373
1374 nla_for_each_attr(nla, head, len, rem) {
1375 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1376 nla_len(nla) != ETH_ALEN)
1377 return -EINVAL;
1378
1379 if (!is_valid_ether_addr(addr: nla_data(nla)))
1380 return -EADDRNOTAVAIL;
1381 }
1382 }
1383
1384 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1385 return -EINVAL;
1386
1387 return 0;
1388}
1389
1390/*
1391 * reconfigure list of remote source mac address
1392 * (only for macvlan devices in source mode)
1393 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1394 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1395 */
1396static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1397 struct nlattr *data[])
1398{
1399 char *addr = NULL;
1400 int ret, rem, len;
1401 struct nlattr *nla, *head;
1402 struct macvlan_source_entry *entry;
1403
1404 if (data[IFLA_MACVLAN_MACADDR])
1405 addr = nla_data(nla: data[IFLA_MACVLAN_MACADDR]);
1406
1407 if (mode == MACVLAN_MACADDR_ADD) {
1408 if (!addr)
1409 return -EINVAL;
1410
1411 return macvlan_hash_add_source(vlan, addr);
1412
1413 } else if (mode == MACVLAN_MACADDR_DEL) {
1414 if (!addr)
1415 return -EINVAL;
1416
1417 entry = macvlan_hash_lookup_source(vlan, addr);
1418 if (entry) {
1419 macvlan_hash_del_source(entry);
1420 vlan->macaddr_count--;
1421 }
1422 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1423 macvlan_flush_sources(port: vlan->port, vlan);
1424 } else if (mode == MACVLAN_MACADDR_SET) {
1425 macvlan_flush_sources(port: vlan->port, vlan);
1426
1427 if (addr) {
1428 ret = macvlan_hash_add_source(vlan, addr);
1429 if (ret)
1430 return ret;
1431 }
1432
1433 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1434 return 0;
1435
1436 head = nla_data(nla: data[IFLA_MACVLAN_MACADDR_DATA]);
1437 len = nla_len(nla: data[IFLA_MACVLAN_MACADDR_DATA]);
1438
1439 nla_for_each_attr(nla, head, len, rem) {
1440 addr = nla_data(nla);
1441 ret = macvlan_hash_add_source(vlan, addr);
1442 if (ret)
1443 return ret;
1444 }
1445 } else {
1446 return -EINVAL;
1447 }
1448
1449 return 0;
1450}
1451
1452int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1453 struct nlattr *tb[], struct nlattr *data[],
1454 struct netlink_ext_ack *extack)
1455{
1456 struct macvlan_dev *vlan = netdev_priv(dev);
1457 struct macvlan_port *port;
1458 struct net_device *lowerdev;
1459 int err;
1460 int macmode;
1461 bool create = false;
1462
1463 if (!tb[IFLA_LINK])
1464 return -EINVAL;
1465
1466 lowerdev = __dev_get_by_index(net: src_net, ifindex: nla_get_u32(nla: tb[IFLA_LINK]));
1467 if (lowerdev == NULL)
1468 return -ENODEV;
1469
1470 /* When creating macvlans or macvtaps on top of other macvlans - use
1471 * the real device as the lowerdev.
1472 */
1473 if (netif_is_macvlan(dev: lowerdev))
1474 lowerdev = macvlan_dev_real_dev(dev: lowerdev);
1475
1476 if (!tb[IFLA_MTU])
1477 dev->mtu = lowerdev->mtu;
1478 else if (dev->mtu > lowerdev->mtu)
1479 return -EINVAL;
1480
1481 /* MTU range: 68 - lowerdev->max_mtu */
1482 dev->min_mtu = ETH_MIN_MTU;
1483 dev->max_mtu = lowerdev->max_mtu;
1484
1485 if (!tb[IFLA_ADDRESS])
1486 eth_hw_addr_random(dev);
1487
1488 if (!netif_is_macvlan_port(dev: lowerdev)) {
1489 err = macvlan_port_create(dev: lowerdev);
1490 if (err < 0)
1491 return err;
1492 create = true;
1493 }
1494 port = macvlan_port_get_rtnl(dev: lowerdev);
1495
1496 /* Only 1 macvlan device can be created in passthru mode */
1497 if (macvlan_passthru(port)) {
1498 /* The macvlan port must be not created this time,
1499 * still goto destroy_macvlan_port for readability.
1500 */
1501 err = -EINVAL;
1502 goto destroy_macvlan_port;
1503 }
1504
1505 vlan->lowerdev = lowerdev;
1506 vlan->dev = dev;
1507 vlan->port = port;
1508 vlan->set_features = MACVLAN_FEATURES;
1509
1510 vlan->mode = MACVLAN_MODE_VEPA;
1511 if (data && data[IFLA_MACVLAN_MODE])
1512 vlan->mode = nla_get_u32(nla: data[IFLA_MACVLAN_MODE]);
1513
1514 if (data && data[IFLA_MACVLAN_FLAGS])
1515 vlan->flags = nla_get_u16(nla: data[IFLA_MACVLAN_FLAGS]);
1516
1517 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1518 if (port->count) {
1519 err = -EINVAL;
1520 goto destroy_macvlan_port;
1521 }
1522 macvlan_set_passthru(port);
1523 eth_hw_addr_inherit(dst: dev, src: lowerdev);
1524 }
1525
1526 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1527 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1528 err = -EINVAL;
1529 goto destroy_macvlan_port;
1530 }
1531 macmode = nla_get_u32(nla: data[IFLA_MACVLAN_MACADDR_MODE]);
1532 err = macvlan_changelink_sources(vlan, mode: macmode, data);
1533 if (err)
1534 goto destroy_macvlan_port;
1535 }
1536
1537 vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1538 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1539 vlan->bc_queue_len_req = nla_get_u32(nla: data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1540
1541 if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1542 update_port_bc_cutoff(
1543 vlan, cutoff: nla_get_s32(nla: data[IFLA_MACVLAN_BC_CUTOFF]));
1544
1545 err = register_netdevice(dev);
1546 if (err < 0)
1547 goto destroy_macvlan_port;
1548
1549 dev->priv_flags |= IFF_MACVLAN;
1550 err = netdev_upper_dev_link(dev: lowerdev, upper_dev: dev, extack);
1551 if (err)
1552 goto unregister_netdev;
1553
1554 list_add_tail_rcu(new: &vlan->list, head: &port->vlans);
1555 update_port_bc_queue_len(port: vlan->port);
1556 netif_stacked_transfer_operstate(rootdev: lowerdev, dev);
1557 linkwatch_fire_event(dev);
1558
1559 return 0;
1560
1561unregister_netdev:
1562 /* macvlan_uninit would free the macvlan port */
1563 unregister_netdevice(dev);
1564 return err;
1565destroy_macvlan_port:
1566 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1567 * so we destroy the macvlan port only when it's valid.
1568 */
1569 if (create && macvlan_port_get_rtnl(dev: lowerdev)) {
1570 macvlan_flush_sources(port, vlan);
1571 macvlan_port_destroy(dev: port->dev);
1572 }
1573 return err;
1574}
1575EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1576
1577static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1578 struct nlattr *tb[], struct nlattr *data[],
1579 struct netlink_ext_ack *extack)
1580{
1581 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1582}
1583
1584void macvlan_dellink(struct net_device *dev, struct list_head *head)
1585{
1586 struct macvlan_dev *vlan = netdev_priv(dev);
1587
1588 if (vlan->mode == MACVLAN_MODE_SOURCE)
1589 macvlan_flush_sources(port: vlan->port, vlan);
1590 list_del_rcu(entry: &vlan->list);
1591 update_port_bc_queue_len(port: vlan->port);
1592 unregister_netdevice_queue(dev, head);
1593 netdev_upper_dev_unlink(dev: vlan->lowerdev, upper_dev: dev);
1594}
1595EXPORT_SYMBOL_GPL(macvlan_dellink);
1596
1597static int macvlan_changelink(struct net_device *dev,
1598 struct nlattr *tb[], struct nlattr *data[],
1599 struct netlink_ext_ack *extack)
1600{
1601 struct macvlan_dev *vlan = netdev_priv(dev);
1602 enum macvlan_mode mode;
1603 bool set_mode = false;
1604 enum macvlan_macaddr_mode macmode;
1605 int ret;
1606
1607 /* Validate mode, but don't set yet: setting flags may fail. */
1608 if (data && data[IFLA_MACVLAN_MODE]) {
1609 set_mode = true;
1610 mode = nla_get_u32(nla: data[IFLA_MACVLAN_MODE]);
1611 /* Passthrough mode can't be set or cleared dynamically */
1612 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1613 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1614 return -EINVAL;
1615 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1616 vlan->mode != mode)
1617 macvlan_flush_sources(port: vlan->port, vlan);
1618 }
1619
1620 if (data && data[IFLA_MACVLAN_FLAGS]) {
1621 __u16 flags = nla_get_u16(nla: data[IFLA_MACVLAN_FLAGS]);
1622 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1623 if (macvlan_passthru(port: vlan->port) && promisc) {
1624 int err;
1625
1626 if (flags & MACVLAN_FLAG_NOPROMISC)
1627 err = dev_set_promiscuity(dev: vlan->lowerdev, inc: -1);
1628 else
1629 err = dev_set_promiscuity(dev: vlan->lowerdev, inc: 1);
1630 if (err < 0)
1631 return err;
1632 }
1633 vlan->flags = flags;
1634 }
1635
1636 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1637 vlan->bc_queue_len_req = nla_get_u32(nla: data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1638 update_port_bc_queue_len(port: vlan->port);
1639 }
1640
1641 if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1642 update_port_bc_cutoff(
1643 vlan, cutoff: nla_get_s32(nla: data[IFLA_MACVLAN_BC_CUTOFF]));
1644
1645 if (set_mode)
1646 vlan->mode = mode;
1647 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1648 if (vlan->mode != MACVLAN_MODE_SOURCE)
1649 return -EINVAL;
1650 macmode = nla_get_u32(nla: data[IFLA_MACVLAN_MACADDR_MODE]);
1651 ret = macvlan_changelink_sources(vlan, mode: macmode, data);
1652 if (ret)
1653 return ret;
1654 }
1655 return 0;
1656}
1657
1658static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1659{
1660 if (vlan->macaddr_count == 0)
1661 return 0;
1662 return nla_total_size(payload: 0) /* IFLA_MACVLAN_MACADDR_DATA */
1663 + vlan->macaddr_count * nla_total_size(payload: sizeof(u8) * ETH_ALEN);
1664}
1665
1666static size_t macvlan_get_size(const struct net_device *dev)
1667{
1668 struct macvlan_dev *vlan = netdev_priv(dev);
1669
1670 return (0
1671 + nla_total_size(payload: 4) /* IFLA_MACVLAN_MODE */
1672 + nla_total_size(payload: 2) /* IFLA_MACVLAN_FLAGS */
1673 + nla_total_size(payload: 4) /* IFLA_MACVLAN_MACADDR_COUNT */
1674 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1675 + nla_total_size(payload: 4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1676 + nla_total_size(payload: 4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1677 );
1678}
1679
1680static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1681 const struct macvlan_dev *vlan,
1682 const int i)
1683{
1684 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1685 struct macvlan_source_entry *entry;
1686
1687 hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
1688 if (entry->vlan != vlan)
1689 continue;
1690 if (nla_put(skb, attrtype: IFLA_MACVLAN_MACADDR, ETH_ALEN, data: entry->addr))
1691 return 1;
1692 }
1693 return 0;
1694}
1695
1696static int macvlan_fill_info(struct sk_buff *skb,
1697 const struct net_device *dev)
1698{
1699 struct macvlan_dev *vlan = netdev_priv(dev);
1700 struct macvlan_port *port = vlan->port;
1701 int i;
1702 struct nlattr *nest;
1703
1704 if (nla_put_u32(skb, attrtype: IFLA_MACVLAN_MODE, value: vlan->mode))
1705 goto nla_put_failure;
1706 if (nla_put_u16(skb, attrtype: IFLA_MACVLAN_FLAGS, value: vlan->flags))
1707 goto nla_put_failure;
1708 if (nla_put_u32(skb, attrtype: IFLA_MACVLAN_MACADDR_COUNT, value: vlan->macaddr_count))
1709 goto nla_put_failure;
1710 if (vlan->macaddr_count > 0) {
1711 nest = nla_nest_start_noflag(skb, attrtype: IFLA_MACVLAN_MACADDR_DATA);
1712 if (nest == NULL)
1713 goto nla_put_failure;
1714
1715 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1716 if (macvlan_fill_info_macaddr(skb, vlan, i))
1717 goto nla_put_failure;
1718 }
1719 nla_nest_end(skb, start: nest);
1720 }
1721 if (nla_put_u32(skb, attrtype: IFLA_MACVLAN_BC_QUEUE_LEN, value: vlan->bc_queue_len_req))
1722 goto nla_put_failure;
1723 if (nla_put_u32(skb, attrtype: IFLA_MACVLAN_BC_QUEUE_LEN_USED, value: port->bc_queue_len_used))
1724 goto nla_put_failure;
1725 if (port->bc_cutoff != 1 &&
1726 nla_put_s32(skb, attrtype: IFLA_MACVLAN_BC_CUTOFF, value: port->bc_cutoff))
1727 goto nla_put_failure;
1728 return 0;
1729
1730nla_put_failure:
1731 return -EMSGSIZE;
1732}
1733
1734static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1735 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1736 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1737 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1738 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1739 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1740 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1741 [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1742 [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1743 [IFLA_MACVLAN_BC_CUTOFF] = { .type = NLA_S32 },
1744};
1745
1746int macvlan_link_register(struct rtnl_link_ops *ops)
1747{
1748 /* common fields */
1749 ops->validate = macvlan_validate;
1750 ops->maxtype = IFLA_MACVLAN_MAX;
1751 ops->policy = macvlan_policy;
1752 ops->changelink = macvlan_changelink;
1753 ops->get_size = macvlan_get_size;
1754 ops->fill_info = macvlan_fill_info;
1755
1756 return rtnl_link_register(ops);
1757};
1758EXPORT_SYMBOL_GPL(macvlan_link_register);
1759
1760static struct net *macvlan_get_link_net(const struct net_device *dev)
1761{
1762 return dev_net(dev: macvlan_dev_real_dev(dev));
1763}
1764
1765static struct rtnl_link_ops macvlan_link_ops = {
1766 .kind = "macvlan",
1767 .setup = macvlan_setup,
1768 .newlink = macvlan_newlink,
1769 .dellink = macvlan_dellink,
1770 .get_link_net = macvlan_get_link_net,
1771 .priv_size = sizeof(struct macvlan_dev),
1772};
1773
1774static void update_port_bc_queue_len(struct macvlan_port *port)
1775{
1776 u32 max_bc_queue_len_req = 0;
1777 struct macvlan_dev *vlan;
1778
1779 list_for_each_entry(vlan, &port->vlans, list) {
1780 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1781 max_bc_queue_len_req = vlan->bc_queue_len_req;
1782 }
1783 port->bc_queue_len_used = max_bc_queue_len_req;
1784}
1785
1786static int macvlan_device_event(struct notifier_block *unused,
1787 unsigned long event, void *ptr)
1788{
1789 struct net_device *dev = netdev_notifier_info_to_dev(info: ptr);
1790 struct macvlan_dev *vlan, *next;
1791 struct macvlan_port *port;
1792 LIST_HEAD(list_kill);
1793
1794 if (!netif_is_macvlan_port(dev))
1795 return NOTIFY_DONE;
1796
1797 port = macvlan_port_get_rtnl(dev);
1798
1799 switch (event) {
1800 case NETDEV_UP:
1801 case NETDEV_DOWN:
1802 case NETDEV_CHANGE:
1803 list_for_each_entry(vlan, &port->vlans, list)
1804 netif_stacked_transfer_operstate(rootdev: vlan->lowerdev,
1805 dev: vlan->dev);
1806 break;
1807 case NETDEV_FEAT_CHANGE:
1808 list_for_each_entry(vlan, &port->vlans, list) {
1809 netif_inherit_tso_max(to: vlan->dev, from: dev);
1810 netdev_update_features(dev: vlan->dev);
1811 }
1812 break;
1813 case NETDEV_CHANGEMTU:
1814 list_for_each_entry(vlan, &port->vlans, list) {
1815 if (vlan->dev->mtu <= dev->mtu)
1816 continue;
1817 dev_set_mtu(vlan->dev, dev->mtu);
1818 }
1819 break;
1820 case NETDEV_CHANGEADDR:
1821 if (!macvlan_passthru(port))
1822 return NOTIFY_DONE;
1823
1824 vlan = list_first_entry_or_null(&port->vlans,
1825 struct macvlan_dev,
1826 list);
1827
1828 if (vlan && macvlan_sync_address(dev: vlan->dev, addr: dev->dev_addr))
1829 return NOTIFY_BAD;
1830
1831 break;
1832 case NETDEV_UNREGISTER:
1833 /* twiddle thumbs on netns device moves */
1834 if (dev->reg_state != NETREG_UNREGISTERING)
1835 break;
1836
1837 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1838 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1839 unregister_netdevice_many(head: &list_kill);
1840 break;
1841 case NETDEV_PRE_TYPE_CHANGE:
1842 /* Forbid underlying device to change its type. */
1843 return NOTIFY_BAD;
1844
1845 case NETDEV_NOTIFY_PEERS:
1846 case NETDEV_BONDING_FAILOVER:
1847 case NETDEV_RESEND_IGMP:
1848 /* Propagate to all vlans */
1849 list_for_each_entry(vlan, &port->vlans, list)
1850 call_netdevice_notifiers(val: event, dev: vlan->dev);
1851 }
1852 return NOTIFY_DONE;
1853}
1854
1855static struct notifier_block macvlan_notifier_block __read_mostly = {
1856 .notifier_call = macvlan_device_event,
1857};
1858
1859static int __init macvlan_init_module(void)
1860{
1861 int err;
1862
1863 register_netdevice_notifier(nb: &macvlan_notifier_block);
1864
1865 err = macvlan_link_register(&macvlan_link_ops);
1866 if (err < 0)
1867 goto err1;
1868 return 0;
1869err1:
1870 unregister_netdevice_notifier(nb: &macvlan_notifier_block);
1871 return err;
1872}
1873
1874static void __exit macvlan_cleanup_module(void)
1875{
1876 rtnl_link_unregister(ops: &macvlan_link_ops);
1877 unregister_netdevice_notifier(nb: &macvlan_notifier_block);
1878}
1879
1880module_init(macvlan_init_module);
1881module_exit(macvlan_cleanup_module);
1882
1883MODULE_LICENSE("GPL");
1884MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1885MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1886MODULE_ALIAS_RTNL_LINK("macvlan");
1887

source code of linux/drivers/net/macvlan.c