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