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Merge tag 'drm-fixes-for-v4.12-rc6' of git://people.freedesktop.org/~airlied/linux
[mirror_ubuntu-bionic-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_OFFLOADS \
793 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
794 NETIF_F_GSO_ROBUST)
795
796 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
797
798 #define MACVLAN_FEATURES \
799 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
800 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
801 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
802 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
803
804 #define MACVLAN_STATE_MASK \
805 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
806
807 static int macvlan_get_nest_level(struct net_device *dev)
808 {
809 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
810 }
811
812 static void macvlan_set_lockdep_class(struct net_device *dev)
813 {
814 netdev_lockdep_set_classes(dev);
815 lockdep_set_class_and_subclass(&dev->addr_list_lock,
816 &macvlan_netdev_addr_lock_key,
817 macvlan_get_nest_level(dev));
818 }
819
820 static int macvlan_init(struct net_device *dev)
821 {
822 struct macvlan_dev *vlan = netdev_priv(dev);
823 const struct net_device *lowerdev = vlan->lowerdev;
824 struct macvlan_port *port = vlan->port;
825
826 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
827 (lowerdev->state & MACVLAN_STATE_MASK);
828 dev->features = lowerdev->features & MACVLAN_FEATURES;
829 dev->features |= ALWAYS_ON_FEATURES;
830 dev->hw_features |= NETIF_F_LRO;
831 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
832 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
833 dev->gso_max_size = lowerdev->gso_max_size;
834 dev->gso_max_segs = lowerdev->gso_max_segs;
835 dev->hard_header_len = lowerdev->hard_header_len;
836
837 macvlan_set_lockdep_class(dev);
838
839 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
840 if (!vlan->pcpu_stats)
841 return -ENOMEM;
842
843 port->count += 1;
844
845 return 0;
846 }
847
848 static void macvlan_uninit(struct net_device *dev)
849 {
850 struct macvlan_dev *vlan = netdev_priv(dev);
851 struct macvlan_port *port = vlan->port;
852
853 free_percpu(vlan->pcpu_stats);
854
855 macvlan_flush_sources(port, vlan);
856 port->count -= 1;
857 if (!port->count)
858 macvlan_port_destroy(port->dev);
859 }
860
861 static void macvlan_dev_get_stats64(struct net_device *dev,
862 struct rtnl_link_stats64 *stats)
863 {
864 struct macvlan_dev *vlan = netdev_priv(dev);
865
866 if (vlan->pcpu_stats) {
867 struct vlan_pcpu_stats *p;
868 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
869 u32 rx_errors = 0, tx_dropped = 0;
870 unsigned int start;
871 int i;
872
873 for_each_possible_cpu(i) {
874 p = per_cpu_ptr(vlan->pcpu_stats, i);
875 do {
876 start = u64_stats_fetch_begin_irq(&p->syncp);
877 rx_packets = p->rx_packets;
878 rx_bytes = p->rx_bytes;
879 rx_multicast = p->rx_multicast;
880 tx_packets = p->tx_packets;
881 tx_bytes = p->tx_bytes;
882 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
883
884 stats->rx_packets += rx_packets;
885 stats->rx_bytes += rx_bytes;
886 stats->multicast += rx_multicast;
887 stats->tx_packets += tx_packets;
888 stats->tx_bytes += tx_bytes;
889 /* rx_errors & tx_dropped are u32, updated
890 * without syncp protection.
891 */
892 rx_errors += p->rx_errors;
893 tx_dropped += p->tx_dropped;
894 }
895 stats->rx_errors = rx_errors;
896 stats->rx_dropped = rx_errors;
897 stats->tx_dropped = tx_dropped;
898 }
899 }
900
901 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
902 __be16 proto, u16 vid)
903 {
904 struct macvlan_dev *vlan = netdev_priv(dev);
905 struct net_device *lowerdev = vlan->lowerdev;
906
907 return vlan_vid_add(lowerdev, proto, vid);
908 }
909
910 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
911 __be16 proto, u16 vid)
912 {
913 struct macvlan_dev *vlan = netdev_priv(dev);
914 struct net_device *lowerdev = vlan->lowerdev;
915
916 vlan_vid_del(lowerdev, proto, vid);
917 return 0;
918 }
919
920 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
921 struct net_device *dev,
922 const unsigned char *addr, u16 vid,
923 u16 flags)
924 {
925 struct macvlan_dev *vlan = netdev_priv(dev);
926 int err = -EINVAL;
927
928 /* Support unicast filter only on passthru devices.
929 * Multicast filter should be allowed on all devices.
930 */
931 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
932 return -EOPNOTSUPP;
933
934 if (flags & NLM_F_REPLACE)
935 return -EOPNOTSUPP;
936
937 if (is_unicast_ether_addr(addr))
938 err = dev_uc_add_excl(dev, addr);
939 else if (is_multicast_ether_addr(addr))
940 err = dev_mc_add_excl(dev, addr);
941
942 return err;
943 }
944
945 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
946 struct net_device *dev,
947 const unsigned char *addr, u16 vid)
948 {
949 struct macvlan_dev *vlan = netdev_priv(dev);
950 int err = -EINVAL;
951
952 /* Support unicast filter only on passthru devices.
953 * Multicast filter should be allowed on all devices.
954 */
955 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
956 return -EOPNOTSUPP;
957
958 if (is_unicast_ether_addr(addr))
959 err = dev_uc_del(dev, addr);
960 else if (is_multicast_ether_addr(addr))
961 err = dev_mc_del(dev, addr);
962
963 return err;
964 }
965
966 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
967 struct ethtool_drvinfo *drvinfo)
968 {
969 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
970 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
971 }
972
973 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
974 struct ethtool_link_ksettings *cmd)
975 {
976 const struct macvlan_dev *vlan = netdev_priv(dev);
977
978 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
979 }
980
981 static netdev_features_t macvlan_fix_features(struct net_device *dev,
982 netdev_features_t features)
983 {
984 struct macvlan_dev *vlan = netdev_priv(dev);
985 netdev_features_t lowerdev_features = vlan->lowerdev->features;
986 netdev_features_t mask;
987
988 features |= NETIF_F_ALL_FOR_ALL;
989 features &= (vlan->set_features | ~MACVLAN_FEATURES);
990 mask = features;
991
992 lowerdev_features &= (features | ~NETIF_F_LRO);
993 features = netdev_increment_features(lowerdev_features, features, mask);
994 features |= ALWAYS_ON_FEATURES;
995 features &= ~NETIF_F_NETNS_LOCAL;
996
997 return features;
998 }
999
1000 #ifdef CONFIG_NET_POLL_CONTROLLER
1001 static void macvlan_dev_poll_controller(struct net_device *dev)
1002 {
1003 return;
1004 }
1005
1006 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1007 {
1008 struct macvlan_dev *vlan = netdev_priv(dev);
1009 struct net_device *real_dev = vlan->lowerdev;
1010 struct netpoll *netpoll;
1011 int err = 0;
1012
1013 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1014 err = -ENOMEM;
1015 if (!netpoll)
1016 goto out;
1017
1018 err = __netpoll_setup(netpoll, real_dev);
1019 if (err) {
1020 kfree(netpoll);
1021 goto out;
1022 }
1023
1024 vlan->netpoll = netpoll;
1025
1026 out:
1027 return err;
1028 }
1029
1030 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1031 {
1032 struct macvlan_dev *vlan = netdev_priv(dev);
1033 struct netpoll *netpoll = vlan->netpoll;
1034
1035 if (!netpoll)
1036 return;
1037
1038 vlan->netpoll = NULL;
1039
1040 __netpoll_free_async(netpoll);
1041 }
1042 #endif /* CONFIG_NET_POLL_CONTROLLER */
1043
1044 static int macvlan_dev_get_iflink(const struct net_device *dev)
1045 {
1046 struct macvlan_dev *vlan = netdev_priv(dev);
1047
1048 return vlan->lowerdev->ifindex;
1049 }
1050
1051 static const struct ethtool_ops macvlan_ethtool_ops = {
1052 .get_link = ethtool_op_get_link,
1053 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1054 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1055 };
1056
1057 static const struct net_device_ops macvlan_netdev_ops = {
1058 .ndo_init = macvlan_init,
1059 .ndo_uninit = macvlan_uninit,
1060 .ndo_open = macvlan_open,
1061 .ndo_stop = macvlan_stop,
1062 .ndo_start_xmit = macvlan_start_xmit,
1063 .ndo_change_mtu = macvlan_change_mtu,
1064 .ndo_fix_features = macvlan_fix_features,
1065 .ndo_change_rx_flags = macvlan_change_rx_flags,
1066 .ndo_set_mac_address = macvlan_set_mac_address,
1067 .ndo_set_rx_mode = macvlan_set_mac_lists,
1068 .ndo_get_stats64 = macvlan_dev_get_stats64,
1069 .ndo_validate_addr = eth_validate_addr,
1070 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1071 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1072 .ndo_fdb_add = macvlan_fdb_add,
1073 .ndo_fdb_del = macvlan_fdb_del,
1074 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1075 .ndo_get_lock_subclass = macvlan_get_nest_level,
1076 #ifdef CONFIG_NET_POLL_CONTROLLER
1077 .ndo_poll_controller = macvlan_dev_poll_controller,
1078 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1079 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1080 #endif
1081 .ndo_get_iflink = macvlan_dev_get_iflink,
1082 .ndo_features_check = passthru_features_check,
1083 };
1084
1085 void macvlan_common_setup(struct net_device *dev)
1086 {
1087 ether_setup(dev);
1088
1089 dev->min_mtu = 0;
1090 dev->max_mtu = ETH_MAX_MTU;
1091 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1092 netif_keep_dst(dev);
1093 dev->priv_flags |= IFF_UNICAST_FLT;
1094 dev->netdev_ops = &macvlan_netdev_ops;
1095 dev->needs_free_netdev = true;
1096 dev->header_ops = &macvlan_hard_header_ops;
1097 dev->ethtool_ops = &macvlan_ethtool_ops;
1098 }
1099 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1100
1101 static void macvlan_setup(struct net_device *dev)
1102 {
1103 macvlan_common_setup(dev);
1104 dev->priv_flags |= IFF_NO_QUEUE;
1105 }
1106
1107 static int macvlan_port_create(struct net_device *dev)
1108 {
1109 struct macvlan_port *port;
1110 unsigned int i;
1111 int err;
1112
1113 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1114 return -EINVAL;
1115
1116 if (netdev_is_rx_handler_busy(dev))
1117 return -EBUSY;
1118
1119 port = kzalloc(sizeof(*port), GFP_KERNEL);
1120 if (port == NULL)
1121 return -ENOMEM;
1122
1123 port->passthru = false;
1124 port->dev = dev;
1125 INIT_LIST_HEAD(&port->vlans);
1126 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1127 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1128 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1129 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1130
1131 skb_queue_head_init(&port->bc_queue);
1132 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1133
1134 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1135 if (err)
1136 kfree(port);
1137 else
1138 dev->priv_flags |= IFF_MACVLAN_PORT;
1139 return err;
1140 }
1141
1142 static void macvlan_port_destroy(struct net_device *dev)
1143 {
1144 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1145 struct sk_buff *skb;
1146
1147 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1148 netdev_rx_handler_unregister(dev);
1149
1150 /* After this point, no packet can schedule bc_work anymore,
1151 * but we need to cancel it and purge left skbs if any.
1152 */
1153 cancel_work_sync(&port->bc_work);
1154
1155 while ((skb = __skb_dequeue(&port->bc_queue))) {
1156 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1157
1158 if (src)
1159 dev_put(src->dev);
1160
1161 kfree_skb(skb);
1162 }
1163
1164 kfree(port);
1165 }
1166
1167 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1168 {
1169 if (tb[IFLA_ADDRESS]) {
1170 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1171 return -EINVAL;
1172 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1173 return -EADDRNOTAVAIL;
1174 }
1175
1176 if (data && data[IFLA_MACVLAN_FLAGS] &&
1177 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1178 return -EINVAL;
1179
1180 if (data && data[IFLA_MACVLAN_MODE]) {
1181 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1182 case MACVLAN_MODE_PRIVATE:
1183 case MACVLAN_MODE_VEPA:
1184 case MACVLAN_MODE_BRIDGE:
1185 case MACVLAN_MODE_PASSTHRU:
1186 case MACVLAN_MODE_SOURCE:
1187 break;
1188 default:
1189 return -EINVAL;
1190 }
1191 }
1192
1193 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1194 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1195 case MACVLAN_MACADDR_ADD:
1196 case MACVLAN_MACADDR_DEL:
1197 case MACVLAN_MACADDR_FLUSH:
1198 case MACVLAN_MACADDR_SET:
1199 break;
1200 default:
1201 return -EINVAL;
1202 }
1203 }
1204
1205 if (data && data[IFLA_MACVLAN_MACADDR]) {
1206 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1207 return -EINVAL;
1208
1209 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1210 return -EADDRNOTAVAIL;
1211 }
1212
1213 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1214 return -EINVAL;
1215
1216 return 0;
1217 }
1218
1219 /**
1220 * reconfigure list of remote source mac address
1221 * (only for macvlan devices in source mode)
1222 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1223 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1224 */
1225 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1226 struct nlattr *data[])
1227 {
1228 char *addr = NULL;
1229 int ret, rem, len;
1230 struct nlattr *nla, *head;
1231 struct macvlan_source_entry *entry;
1232
1233 if (data[IFLA_MACVLAN_MACADDR])
1234 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1235
1236 if (mode == MACVLAN_MACADDR_ADD) {
1237 if (!addr)
1238 return -EINVAL;
1239
1240 return macvlan_hash_add_source(vlan, addr);
1241
1242 } else if (mode == MACVLAN_MACADDR_DEL) {
1243 if (!addr)
1244 return -EINVAL;
1245
1246 entry = macvlan_hash_lookup_source(vlan, addr);
1247 if (entry) {
1248 macvlan_hash_del_source(entry);
1249 vlan->macaddr_count--;
1250 }
1251 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1252 macvlan_flush_sources(vlan->port, vlan);
1253 } else if (mode == MACVLAN_MACADDR_SET) {
1254 macvlan_flush_sources(vlan->port, vlan);
1255
1256 if (addr) {
1257 ret = macvlan_hash_add_source(vlan, addr);
1258 if (ret)
1259 return ret;
1260 }
1261
1262 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1263 return 0;
1264
1265 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1266 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1267
1268 nla_for_each_attr(nla, head, len, rem) {
1269 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1270 nla_len(nla) != ETH_ALEN)
1271 continue;
1272
1273 addr = nla_data(nla);
1274 ret = macvlan_hash_add_source(vlan, addr);
1275 if (ret)
1276 return ret;
1277 }
1278 } else {
1279 return -EINVAL;
1280 }
1281
1282 return 0;
1283 }
1284
1285 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1286 struct nlattr *tb[], struct nlattr *data[])
1287 {
1288 struct macvlan_dev *vlan = netdev_priv(dev);
1289 struct macvlan_port *port;
1290 struct net_device *lowerdev;
1291 int err;
1292 int macmode;
1293 bool create = false;
1294
1295 if (!tb[IFLA_LINK])
1296 return -EINVAL;
1297
1298 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1299 if (lowerdev == NULL)
1300 return -ENODEV;
1301
1302 /* When creating macvlans or macvtaps on top of other macvlans - use
1303 * the real device as the lowerdev.
1304 */
1305 if (netif_is_macvlan(lowerdev))
1306 lowerdev = macvlan_dev_real_dev(lowerdev);
1307
1308 if (!tb[IFLA_MTU])
1309 dev->mtu = lowerdev->mtu;
1310 else if (dev->mtu > lowerdev->mtu)
1311 return -EINVAL;
1312
1313 /* MTU range: 68 - lowerdev->max_mtu */
1314 dev->min_mtu = ETH_MIN_MTU;
1315 dev->max_mtu = lowerdev->max_mtu;
1316
1317 if (!tb[IFLA_ADDRESS])
1318 eth_hw_addr_random(dev);
1319
1320 if (!macvlan_port_exists(lowerdev)) {
1321 err = macvlan_port_create(lowerdev);
1322 if (err < 0)
1323 return err;
1324 create = true;
1325 }
1326 port = macvlan_port_get_rtnl(lowerdev);
1327
1328 /* Only 1 macvlan device can be created in passthru mode */
1329 if (port->passthru) {
1330 /* The macvlan port must be not created this time,
1331 * still goto destroy_macvlan_port for readability.
1332 */
1333 err = -EINVAL;
1334 goto destroy_macvlan_port;
1335 }
1336
1337 vlan->lowerdev = lowerdev;
1338 vlan->dev = dev;
1339 vlan->port = port;
1340 vlan->set_features = MACVLAN_FEATURES;
1341 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1342
1343 vlan->mode = MACVLAN_MODE_VEPA;
1344 if (data && data[IFLA_MACVLAN_MODE])
1345 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1346
1347 if (data && data[IFLA_MACVLAN_FLAGS])
1348 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1349
1350 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1351 if (port->count) {
1352 err = -EINVAL;
1353 goto destroy_macvlan_port;
1354 }
1355 port->passthru = true;
1356 eth_hw_addr_inherit(dev, lowerdev);
1357 }
1358
1359 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1360 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1361 err = -EINVAL;
1362 goto destroy_macvlan_port;
1363 }
1364 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1365 err = macvlan_changelink_sources(vlan, macmode, data);
1366 if (err)
1367 goto destroy_macvlan_port;
1368 }
1369
1370 err = register_netdevice(dev);
1371 if (err < 0)
1372 goto destroy_macvlan_port;
1373
1374 dev->priv_flags |= IFF_MACVLAN;
1375 err = netdev_upper_dev_link(lowerdev, dev);
1376 if (err)
1377 goto unregister_netdev;
1378
1379 list_add_tail_rcu(&vlan->list, &port->vlans);
1380 netif_stacked_transfer_operstate(lowerdev, dev);
1381 linkwatch_fire_event(dev);
1382
1383 return 0;
1384
1385 unregister_netdev:
1386 unregister_netdevice(dev);
1387 destroy_macvlan_port:
1388 if (create)
1389 macvlan_port_destroy(port->dev);
1390 return err;
1391 }
1392 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1393
1394 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1395 struct nlattr *tb[], struct nlattr *data[])
1396 {
1397 return macvlan_common_newlink(src_net, dev, tb, data);
1398 }
1399
1400 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1401 {
1402 struct macvlan_dev *vlan = netdev_priv(dev);
1403
1404 if (vlan->mode == MACVLAN_MODE_SOURCE)
1405 macvlan_flush_sources(vlan->port, vlan);
1406 list_del_rcu(&vlan->list);
1407 unregister_netdevice_queue(dev, head);
1408 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1409 }
1410 EXPORT_SYMBOL_GPL(macvlan_dellink);
1411
1412 static int macvlan_changelink(struct net_device *dev,
1413 struct nlattr *tb[], struct nlattr *data[])
1414 {
1415 struct macvlan_dev *vlan = netdev_priv(dev);
1416 enum macvlan_mode mode;
1417 bool set_mode = false;
1418 enum macvlan_macaddr_mode macmode;
1419 int ret;
1420
1421 /* Validate mode, but don't set yet: setting flags may fail. */
1422 if (data && data[IFLA_MACVLAN_MODE]) {
1423 set_mode = true;
1424 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1425 /* Passthrough mode can't be set or cleared dynamically */
1426 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1427 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1428 return -EINVAL;
1429 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1430 vlan->mode != mode)
1431 macvlan_flush_sources(vlan->port, vlan);
1432 }
1433
1434 if (data && data[IFLA_MACVLAN_FLAGS]) {
1435 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1436 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1437 if (vlan->port->passthru && promisc) {
1438 int err;
1439
1440 if (flags & MACVLAN_FLAG_NOPROMISC)
1441 err = dev_set_promiscuity(vlan->lowerdev, -1);
1442 else
1443 err = dev_set_promiscuity(vlan->lowerdev, 1);
1444 if (err < 0)
1445 return err;
1446 }
1447 vlan->flags = flags;
1448 }
1449 if (set_mode)
1450 vlan->mode = mode;
1451 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1452 if (vlan->mode != MACVLAN_MODE_SOURCE)
1453 return -EINVAL;
1454 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1455 ret = macvlan_changelink_sources(vlan, macmode, data);
1456 if (ret)
1457 return ret;
1458 }
1459 return 0;
1460 }
1461
1462 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1463 {
1464 if (vlan->macaddr_count == 0)
1465 return 0;
1466 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1467 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1468 }
1469
1470 static size_t macvlan_get_size(const struct net_device *dev)
1471 {
1472 struct macvlan_dev *vlan = netdev_priv(dev);
1473
1474 return (0
1475 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1476 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1477 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1478 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1479 );
1480 }
1481
1482 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1483 const struct macvlan_dev *vlan,
1484 const int i)
1485 {
1486 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1487 struct macvlan_source_entry *entry;
1488
1489 hlist_for_each_entry_rcu(entry, h, hlist) {
1490 if (entry->vlan != vlan)
1491 continue;
1492 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1493 return 1;
1494 }
1495 return 0;
1496 }
1497
1498 static int macvlan_fill_info(struct sk_buff *skb,
1499 const struct net_device *dev)
1500 {
1501 struct macvlan_dev *vlan = netdev_priv(dev);
1502 int i;
1503 struct nlattr *nest;
1504
1505 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1506 goto nla_put_failure;
1507 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1508 goto nla_put_failure;
1509 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1510 goto nla_put_failure;
1511 if (vlan->macaddr_count > 0) {
1512 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1513 if (nest == NULL)
1514 goto nla_put_failure;
1515
1516 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1517 if (macvlan_fill_info_macaddr(skb, vlan, i))
1518 goto nla_put_failure;
1519 }
1520 nla_nest_end(skb, nest);
1521 }
1522 return 0;
1523
1524 nla_put_failure:
1525 return -EMSGSIZE;
1526 }
1527
1528 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1529 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1530 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1531 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1532 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1533 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1534 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1535 };
1536
1537 int macvlan_link_register(struct rtnl_link_ops *ops)
1538 {
1539 /* common fields */
1540 ops->validate = macvlan_validate;
1541 ops->maxtype = IFLA_MACVLAN_MAX;
1542 ops->policy = macvlan_policy;
1543 ops->changelink = macvlan_changelink;
1544 ops->get_size = macvlan_get_size;
1545 ops->fill_info = macvlan_fill_info;
1546
1547 return rtnl_link_register(ops);
1548 };
1549 EXPORT_SYMBOL_GPL(macvlan_link_register);
1550
1551 static struct net *macvlan_get_link_net(const struct net_device *dev)
1552 {
1553 return dev_net(macvlan_dev_real_dev(dev));
1554 }
1555
1556 static struct rtnl_link_ops macvlan_link_ops = {
1557 .kind = "macvlan",
1558 .setup = macvlan_setup,
1559 .newlink = macvlan_newlink,
1560 .dellink = macvlan_dellink,
1561 .get_link_net = macvlan_get_link_net,
1562 .priv_size = sizeof(struct macvlan_dev),
1563 };
1564
1565 static int macvlan_device_event(struct notifier_block *unused,
1566 unsigned long event, void *ptr)
1567 {
1568 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1569 struct macvlan_dev *vlan, *next;
1570 struct macvlan_port *port;
1571 LIST_HEAD(list_kill);
1572
1573 if (!macvlan_port_exists(dev))
1574 return NOTIFY_DONE;
1575
1576 port = macvlan_port_get_rtnl(dev);
1577
1578 switch (event) {
1579 case NETDEV_UP:
1580 case NETDEV_CHANGE:
1581 list_for_each_entry(vlan, &port->vlans, list)
1582 netif_stacked_transfer_operstate(vlan->lowerdev,
1583 vlan->dev);
1584 break;
1585 case NETDEV_FEAT_CHANGE:
1586 list_for_each_entry(vlan, &port->vlans, list) {
1587 vlan->dev->gso_max_size = dev->gso_max_size;
1588 vlan->dev->gso_max_segs = dev->gso_max_segs;
1589 netdev_update_features(vlan->dev);
1590 }
1591 break;
1592 case NETDEV_CHANGEMTU:
1593 list_for_each_entry(vlan, &port->vlans, list) {
1594 if (vlan->dev->mtu <= dev->mtu)
1595 continue;
1596 dev_set_mtu(vlan->dev, dev->mtu);
1597 }
1598 break;
1599 case NETDEV_CHANGEADDR:
1600 if (!port->passthru)
1601 return NOTIFY_DONE;
1602
1603 vlan = list_first_entry_or_null(&port->vlans,
1604 struct macvlan_dev,
1605 list);
1606
1607 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1608 return NOTIFY_BAD;
1609
1610 break;
1611 case NETDEV_UNREGISTER:
1612 /* twiddle thumbs on netns device moves */
1613 if (dev->reg_state != NETREG_UNREGISTERING)
1614 break;
1615
1616 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1617 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1618 unregister_netdevice_many(&list_kill);
1619 break;
1620 case NETDEV_PRE_TYPE_CHANGE:
1621 /* Forbid underlaying device to change its type. */
1622 return NOTIFY_BAD;
1623
1624 case NETDEV_NOTIFY_PEERS:
1625 case NETDEV_BONDING_FAILOVER:
1626 case NETDEV_RESEND_IGMP:
1627 /* Propagate to all vlans */
1628 list_for_each_entry(vlan, &port->vlans, list)
1629 call_netdevice_notifiers(event, vlan->dev);
1630 }
1631 return NOTIFY_DONE;
1632 }
1633
1634 static struct notifier_block macvlan_notifier_block __read_mostly = {
1635 .notifier_call = macvlan_device_event,
1636 };
1637
1638 static int __init macvlan_init_module(void)
1639 {
1640 int err;
1641
1642 register_netdevice_notifier(&macvlan_notifier_block);
1643
1644 err = macvlan_link_register(&macvlan_link_ops);
1645 if (err < 0)
1646 goto err1;
1647 return 0;
1648 err1:
1649 unregister_netdevice_notifier(&macvlan_notifier_block);
1650 return err;
1651 }
1652
1653 static void __exit macvlan_cleanup_module(void)
1654 {
1655 rtnl_link_unregister(&macvlan_link_ops);
1656 unregister_netdevice_notifier(&macvlan_notifier_block);
1657 }
1658
1659 module_init(macvlan_init_module);
1660 module_exit(macvlan_cleanup_module);
1661
1662 MODULE_LICENSE("GPL");
1663 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1664 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1665 MODULE_ALIAS_RTNL_LINK("macvlan");
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