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[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 rcu_head rcu;
47 struct sk_buff_head bc_queue;
48 struct work_struct bc_work;
49 bool passthru;
50 int count;
51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
52 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
53 };
54
55 struct macvlan_source_entry {
56 struct hlist_node hlist;
57 struct macvlan_dev *vlan;
58 unsigned char addr[6+2] __aligned(sizeof(u16));
59 struct rcu_head rcu;
60 };
61
62 struct macvlan_skb_cb {
63 const struct macvlan_dev *src;
64 };
65
66 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
67
68 static void macvlan_port_destroy(struct net_device *dev);
69
70 /* Hash Ethernet address */
71 static u32 macvlan_eth_hash(const unsigned char *addr)
72 {
73 u64 value = get_unaligned((u64 *)addr);
74
75 /* only want 6 bytes */
76 #ifdef __BIG_ENDIAN
77 value >>= 16;
78 #else
79 value <<= 16;
80 #endif
81 return hash_64(value, MACVLAN_HASH_BITS);
82 }
83
84 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
85 {
86 return rcu_dereference(dev->rx_handler_data);
87 }
88
89 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
90 {
91 return rtnl_dereference(dev->rx_handler_data);
92 }
93
94 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
95
96 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
97 const unsigned char *addr)
98 {
99 struct macvlan_dev *vlan;
100 u32 idx = macvlan_eth_hash(addr);
101
102 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
103 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
104 return vlan;
105 }
106 return NULL;
107 }
108
109 static struct macvlan_source_entry *macvlan_hash_lookup_source(
110 const struct macvlan_dev *vlan,
111 const unsigned char *addr)
112 {
113 struct macvlan_source_entry *entry;
114 u32 idx = macvlan_eth_hash(addr);
115 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
116
117 hlist_for_each_entry_rcu(entry, h, hlist) {
118 if (ether_addr_equal_64bits(entry->addr, addr) &&
119 entry->vlan == vlan)
120 return entry;
121 }
122 return NULL;
123 }
124
125 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
126 const unsigned char *addr)
127 {
128 struct macvlan_port *port = vlan->port;
129 struct macvlan_source_entry *entry;
130 struct hlist_head *h;
131
132 entry = macvlan_hash_lookup_source(vlan, addr);
133 if (entry)
134 return 0;
135
136 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
137 if (!entry)
138 return -ENOMEM;
139
140 ether_addr_copy(entry->addr, addr);
141 entry->vlan = vlan;
142 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
143 hlist_add_head_rcu(&entry->hlist, h);
144 vlan->macaddr_count++;
145
146 return 0;
147 }
148
149 static void macvlan_hash_add(struct macvlan_dev *vlan)
150 {
151 struct macvlan_port *port = vlan->port;
152 const unsigned char *addr = vlan->dev->dev_addr;
153 u32 idx = macvlan_eth_hash(addr);
154
155 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
156 }
157
158 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
159 {
160 hlist_del_rcu(&entry->hlist);
161 kfree_rcu(entry, rcu);
162 }
163
164 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
165 {
166 hlist_del_rcu(&vlan->hlist);
167 if (sync)
168 synchronize_rcu();
169 }
170
171 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
172 const unsigned char *addr)
173 {
174 macvlan_hash_del(vlan, true);
175 /* Now that we are unhashed it is safe to change the device
176 * address without confusing packet delivery.
177 */
178 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
179 macvlan_hash_add(vlan);
180 }
181
182 static int macvlan_addr_busy(const struct macvlan_port *port,
183 const unsigned char *addr)
184 {
185 /* Test to see if the specified multicast address is
186 * currently in use by the underlying device or
187 * another macvlan.
188 */
189 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
190 return 1;
191
192 if (macvlan_hash_lookup(port, addr))
193 return 1;
194
195 return 0;
196 }
197
198
199 static int macvlan_broadcast_one(struct sk_buff *skb,
200 const struct macvlan_dev *vlan,
201 const struct ethhdr *eth, bool local)
202 {
203 struct net_device *dev = vlan->dev;
204
205 if (local)
206 return __dev_forward_skb(dev, skb);
207
208 skb->dev = dev;
209 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
210 skb->pkt_type = PACKET_BROADCAST;
211 else
212 skb->pkt_type = PACKET_MULTICAST;
213
214 return 0;
215 }
216
217 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
218 {
219 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
220 }
221
222
223 static unsigned int mc_hash(const struct macvlan_dev *vlan,
224 const unsigned char *addr)
225 {
226 u32 val = __get_unaligned_cpu32(addr + 2);
227
228 val ^= macvlan_hash_mix(vlan);
229 return hash_32(val, MACVLAN_MC_FILTER_BITS);
230 }
231
232 static void macvlan_broadcast(struct sk_buff *skb,
233 const struct macvlan_port *port,
234 struct net_device *src,
235 enum macvlan_mode mode)
236 {
237 const struct ethhdr *eth = eth_hdr(skb);
238 const struct macvlan_dev *vlan;
239 struct sk_buff *nskb;
240 unsigned int i;
241 int err;
242 unsigned int hash;
243
244 if (skb->protocol == htons(ETH_P_PAUSE))
245 return;
246
247 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
248 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
249 if (vlan->dev == src || !(vlan->mode & mode))
250 continue;
251
252 hash = mc_hash(vlan, eth->h_dest);
253 if (!test_bit(hash, vlan->mc_filter))
254 continue;
255
256 err = NET_RX_DROP;
257 nskb = skb_clone(skb, GFP_ATOMIC);
258 if (likely(nskb))
259 err = macvlan_broadcast_one(
260 nskb, vlan, eth,
261 mode == MACVLAN_MODE_BRIDGE) ?:
262 netif_rx_ni(nskb);
263 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
264 err == NET_RX_SUCCESS, true);
265 }
266 }
267 }
268
269 static void macvlan_process_broadcast(struct work_struct *w)
270 {
271 struct macvlan_port *port = container_of(w, struct macvlan_port,
272 bc_work);
273 struct sk_buff *skb;
274 struct sk_buff_head list;
275
276 __skb_queue_head_init(&list);
277
278 spin_lock_bh(&port->bc_queue.lock);
279 skb_queue_splice_tail_init(&port->bc_queue, &list);
280 spin_unlock_bh(&port->bc_queue.lock);
281
282 while ((skb = __skb_dequeue(&list))) {
283 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
284
285 rcu_read_lock();
286
287 if (!src)
288 /* frame comes from an external address */
289 macvlan_broadcast(skb, port, NULL,
290 MACVLAN_MODE_PRIVATE |
291 MACVLAN_MODE_VEPA |
292 MACVLAN_MODE_PASSTHRU|
293 MACVLAN_MODE_BRIDGE);
294 else if (src->mode == MACVLAN_MODE_VEPA)
295 /* flood to everyone except source */
296 macvlan_broadcast(skb, port, src->dev,
297 MACVLAN_MODE_VEPA |
298 MACVLAN_MODE_BRIDGE);
299 else
300 /*
301 * flood only to VEPA ports, bridge ports
302 * already saw the frame on the way out.
303 */
304 macvlan_broadcast(skb, port, src->dev,
305 MACVLAN_MODE_VEPA);
306
307 rcu_read_unlock();
308
309 if (src)
310 dev_put(src->dev);
311 kfree_skb(skb);
312 }
313 }
314
315 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
316 const struct macvlan_dev *src,
317 struct sk_buff *skb)
318 {
319 struct sk_buff *nskb;
320 int err = -ENOMEM;
321
322 nskb = skb_clone(skb, GFP_ATOMIC);
323 if (!nskb)
324 goto err;
325
326 MACVLAN_SKB_CB(nskb)->src = src;
327
328 spin_lock(&port->bc_queue.lock);
329 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
330 if (src)
331 dev_hold(src->dev);
332 __skb_queue_tail(&port->bc_queue, nskb);
333 err = 0;
334 }
335 spin_unlock(&port->bc_queue.lock);
336
337 if (err)
338 goto free_nskb;
339
340 schedule_work(&port->bc_work);
341 return;
342
343 free_nskb:
344 kfree_skb(nskb);
345 err:
346 atomic_long_inc(&skb->dev->rx_dropped);
347 }
348
349 static void macvlan_flush_sources(struct macvlan_port *port,
350 struct macvlan_dev *vlan)
351 {
352 int i;
353
354 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
355 struct hlist_node *h, *n;
356
357 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
358 struct macvlan_source_entry *entry;
359
360 entry = hlist_entry(h, struct macvlan_source_entry,
361 hlist);
362 if (entry->vlan == vlan)
363 macvlan_hash_del_source(entry);
364 }
365 }
366 vlan->macaddr_count = 0;
367 }
368
369 static void macvlan_forward_source_one(struct sk_buff *skb,
370 struct macvlan_dev *vlan)
371 {
372 struct sk_buff *nskb;
373 struct net_device *dev;
374 int len;
375 int ret;
376
377 dev = vlan->dev;
378 if (unlikely(!(dev->flags & IFF_UP)))
379 return;
380
381 nskb = skb_clone(skb, GFP_ATOMIC);
382 if (!nskb)
383 return;
384
385 len = nskb->len + ETH_HLEN;
386 nskb->dev = dev;
387 nskb->pkt_type = PACKET_HOST;
388
389 ret = netif_rx(nskb);
390 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
391 }
392
393 static void macvlan_forward_source(struct sk_buff *skb,
394 struct macvlan_port *port,
395 const unsigned char *addr)
396 {
397 struct macvlan_source_entry *entry;
398 u32 idx = macvlan_eth_hash(addr);
399 struct hlist_head *h = &port->vlan_source_hash[idx];
400
401 hlist_for_each_entry_rcu(entry, h, hlist) {
402 if (ether_addr_equal_64bits(entry->addr, addr))
403 if (entry->vlan->dev->flags & IFF_UP)
404 macvlan_forward_source_one(skb, entry->vlan);
405 }
406 }
407
408 /* called under rcu_read_lock() from netif_receive_skb */
409 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
410 {
411 struct macvlan_port *port;
412 struct sk_buff *skb = *pskb;
413 const struct ethhdr *eth = eth_hdr(skb);
414 const struct macvlan_dev *vlan;
415 const struct macvlan_dev *src;
416 struct net_device *dev;
417 unsigned int len = 0;
418 int ret;
419 rx_handler_result_t handle_res;
420
421 port = macvlan_port_get_rcu(skb->dev);
422 if (is_multicast_ether_addr(eth->h_dest)) {
423 unsigned int hash;
424
425 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
426 if (!skb)
427 return RX_HANDLER_CONSUMED;
428 *pskb = skb;
429 eth = eth_hdr(skb);
430 macvlan_forward_source(skb, port, eth->h_source);
431 src = macvlan_hash_lookup(port, eth->h_source);
432 if (src && src->mode != MACVLAN_MODE_VEPA &&
433 src->mode != MACVLAN_MODE_BRIDGE) {
434 /* forward to original port. */
435 vlan = src;
436 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
437 netif_rx(skb);
438 handle_res = RX_HANDLER_CONSUMED;
439 goto out;
440 }
441
442 hash = mc_hash(NULL, eth->h_dest);
443 if (test_bit(hash, port->mc_filter))
444 macvlan_broadcast_enqueue(port, src, skb);
445
446 return RX_HANDLER_PASS;
447 }
448
449 macvlan_forward_source(skb, port, eth->h_source);
450 if (port->passthru)
451 vlan = list_first_or_null_rcu(&port->vlans,
452 struct macvlan_dev, list);
453 else
454 vlan = macvlan_hash_lookup(port, eth->h_dest);
455 if (vlan == NULL)
456 return RX_HANDLER_PASS;
457
458 dev = vlan->dev;
459 if (unlikely(!(dev->flags & IFF_UP))) {
460 kfree_skb(skb);
461 return RX_HANDLER_CONSUMED;
462 }
463 len = skb->len + ETH_HLEN;
464 skb = skb_share_check(skb, GFP_ATOMIC);
465 if (!skb) {
466 ret = NET_RX_DROP;
467 handle_res = RX_HANDLER_CONSUMED;
468 goto out;
469 }
470
471 *pskb = skb;
472 skb->dev = dev;
473 skb->pkt_type = PACKET_HOST;
474
475 ret = NET_RX_SUCCESS;
476 handle_res = RX_HANDLER_ANOTHER;
477 out:
478 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
479 return handle_res;
480 }
481
482 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
483 {
484 const struct macvlan_dev *vlan = netdev_priv(dev);
485 const struct macvlan_port *port = vlan->port;
486 const struct macvlan_dev *dest;
487
488 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
489 const struct ethhdr *eth = (void *)skb->data;
490
491 /* send to other bridge ports directly */
492 if (is_multicast_ether_addr(eth->h_dest)) {
493 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
494 goto xmit_world;
495 }
496
497 dest = macvlan_hash_lookup(port, eth->h_dest);
498 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
499 /* send to lowerdev first for its network taps */
500 dev_forward_skb(vlan->lowerdev, skb);
501
502 return NET_XMIT_SUCCESS;
503 }
504 }
505
506 xmit_world:
507 skb->dev = vlan->lowerdev;
508 return dev_queue_xmit(skb);
509 }
510
511 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
512 {
513 #ifdef CONFIG_NET_POLL_CONTROLLER
514 if (vlan->netpoll)
515 netpoll_send_skb(vlan->netpoll, skb);
516 #else
517 BUG();
518 #endif
519 return NETDEV_TX_OK;
520 }
521
522 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
523 struct net_device *dev)
524 {
525 unsigned int len = skb->len;
526 int ret;
527 struct macvlan_dev *vlan = netdev_priv(dev);
528
529 if (unlikely(netpoll_tx_running(dev)))
530 return macvlan_netpoll_send_skb(vlan, skb);
531
532 if (vlan->fwd_priv) {
533 skb->dev = vlan->lowerdev;
534 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
535 } else {
536 ret = macvlan_queue_xmit(skb, dev);
537 }
538
539 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
540 struct vlan_pcpu_stats *pcpu_stats;
541
542 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
543 u64_stats_update_begin(&pcpu_stats->syncp);
544 pcpu_stats->tx_packets++;
545 pcpu_stats->tx_bytes += len;
546 u64_stats_update_end(&pcpu_stats->syncp);
547 } else {
548 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
549 }
550 return ret;
551 }
552
553 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
554 unsigned short type, const void *daddr,
555 const void *saddr, unsigned len)
556 {
557 const struct macvlan_dev *vlan = netdev_priv(dev);
558 struct net_device *lowerdev = vlan->lowerdev;
559
560 return dev_hard_header(skb, lowerdev, type, daddr,
561 saddr ? : dev->dev_addr, len);
562 }
563
564 static const struct header_ops macvlan_hard_header_ops = {
565 .create = macvlan_hard_header,
566 .parse = eth_header_parse,
567 .cache = eth_header_cache,
568 .cache_update = eth_header_cache_update,
569 };
570
571 static struct rtnl_link_ops macvlan_link_ops;
572
573 static int macvlan_open(struct net_device *dev)
574 {
575 struct macvlan_dev *vlan = netdev_priv(dev);
576 struct net_device *lowerdev = vlan->lowerdev;
577 int err;
578
579 if (vlan->port->passthru) {
580 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
581 err = dev_set_promiscuity(lowerdev, 1);
582 if (err < 0)
583 goto out;
584 }
585 goto hash_add;
586 }
587
588 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
589 dev->rtnl_link_ops == &macvlan_link_ops) {
590 vlan->fwd_priv =
591 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
592
593 /* If we get a NULL pointer back, or if we get an error
594 * then we should just fall through to the non accelerated path
595 */
596 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
597 vlan->fwd_priv = NULL;
598 } else
599 return 0;
600 }
601
602 err = -EBUSY;
603 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
604 goto out;
605
606 err = dev_uc_add(lowerdev, dev->dev_addr);
607 if (err < 0)
608 goto out;
609 if (dev->flags & IFF_ALLMULTI) {
610 err = dev_set_allmulti(lowerdev, 1);
611 if (err < 0)
612 goto del_unicast;
613 }
614
615 if (dev->flags & IFF_PROMISC) {
616 err = dev_set_promiscuity(lowerdev, 1);
617 if (err < 0)
618 goto clear_multi;
619 }
620
621 hash_add:
622 macvlan_hash_add(vlan);
623 return 0;
624
625 clear_multi:
626 if (dev->flags & IFF_ALLMULTI)
627 dev_set_allmulti(lowerdev, -1);
628 del_unicast:
629 dev_uc_del(lowerdev, dev->dev_addr);
630 out:
631 if (vlan->fwd_priv) {
632 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
633 vlan->fwd_priv);
634 vlan->fwd_priv = NULL;
635 }
636 return err;
637 }
638
639 static int macvlan_stop(struct net_device *dev)
640 {
641 struct macvlan_dev *vlan = netdev_priv(dev);
642 struct net_device *lowerdev = vlan->lowerdev;
643
644 if (vlan->fwd_priv) {
645 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
646 vlan->fwd_priv);
647 vlan->fwd_priv = NULL;
648 return 0;
649 }
650
651 dev_uc_unsync(lowerdev, dev);
652 dev_mc_unsync(lowerdev, dev);
653
654 if (vlan->port->passthru) {
655 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
656 dev_set_promiscuity(lowerdev, -1);
657 goto hash_del;
658 }
659
660 if (dev->flags & IFF_ALLMULTI)
661 dev_set_allmulti(lowerdev, -1);
662
663 if (dev->flags & IFF_PROMISC)
664 dev_set_promiscuity(lowerdev, -1);
665
666 dev_uc_del(lowerdev, dev->dev_addr);
667
668 hash_del:
669 macvlan_hash_del(vlan, !dev->dismantle);
670 return 0;
671 }
672
673 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
674 {
675 struct macvlan_dev *vlan = netdev_priv(dev);
676 struct net_device *lowerdev = vlan->lowerdev;
677 int err;
678
679 if (!(dev->flags & IFF_UP)) {
680 /* Just copy in the new address */
681 ether_addr_copy(dev->dev_addr, addr);
682 } else {
683 /* Rehash and update the device filters */
684 if (macvlan_addr_busy(vlan->port, addr))
685 return -EBUSY;
686
687 if (!vlan->port->passthru) {
688 err = dev_uc_add(lowerdev, addr);
689 if (err)
690 return err;
691
692 dev_uc_del(lowerdev, dev->dev_addr);
693 }
694
695 macvlan_hash_change_addr(vlan, addr);
696 }
697 return 0;
698 }
699
700 static int macvlan_set_mac_address(struct net_device *dev, void *p)
701 {
702 struct macvlan_dev *vlan = netdev_priv(dev);
703 struct sockaddr *addr = p;
704
705 if (!is_valid_ether_addr(addr->sa_data))
706 return -EADDRNOTAVAIL;
707
708 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
709 dev_set_mac_address(vlan->lowerdev, addr);
710 return 0;
711 }
712
713 return macvlan_sync_address(dev, addr->sa_data);
714 }
715
716 static void macvlan_change_rx_flags(struct net_device *dev, int change)
717 {
718 struct macvlan_dev *vlan = netdev_priv(dev);
719 struct net_device *lowerdev = vlan->lowerdev;
720
721 if (dev->flags & IFF_UP) {
722 if (change & IFF_ALLMULTI)
723 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
724 if (change & IFF_PROMISC)
725 dev_set_promiscuity(lowerdev,
726 dev->flags & IFF_PROMISC ? 1 : -1);
727
728 }
729 }
730
731 static void macvlan_compute_filter(unsigned long *mc_filter,
732 struct net_device *dev,
733 struct macvlan_dev *vlan)
734 {
735 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
736 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
737 } else {
738 struct netdev_hw_addr *ha;
739 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
740
741 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
742 netdev_for_each_mc_addr(ha, dev) {
743 __set_bit(mc_hash(vlan, ha->addr), filter);
744 }
745
746 __set_bit(mc_hash(vlan, dev->broadcast), filter);
747
748 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
749 }
750 }
751
752 static void macvlan_set_mac_lists(struct net_device *dev)
753 {
754 struct macvlan_dev *vlan = netdev_priv(dev);
755
756 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
757
758 dev_uc_sync(vlan->lowerdev, dev);
759 dev_mc_sync(vlan->lowerdev, dev);
760
761 /* This is slightly inaccurate as we're including the subscription
762 * list of vlan->lowerdev too.
763 *
764 * Bug alert: This only works if everyone has the same broadcast
765 * address as lowerdev. As soon as someone changes theirs this
766 * will break.
767 *
768 * However, this is already broken as when you change your broadcast
769 * address we don't get called.
770 *
771 * The solution is to maintain a list of broadcast addresses like
772 * we do for uc/mc, if you care.
773 */
774 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
775 }
776
777 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
778 {
779 struct macvlan_dev *vlan = netdev_priv(dev);
780
781 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
782 return -EINVAL;
783 dev->mtu = new_mtu;
784 return 0;
785 }
786
787 /*
788 * macvlan network devices have devices nesting below it and are a special
789 * "super class" of normal network devices; split their locks off into a
790 * separate class since they always nest.
791 */
792 static struct lock_class_key macvlan_netdev_addr_lock_key;
793
794 #define ALWAYS_ON_FEATURES \
795 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
796 NETIF_F_GSO_ROBUST)
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->gso_max_size = lowerdev->gso_max_size;
833 dev->gso_max_segs = lowerdev->gso_max_segs;
834 dev->hard_header_len = lowerdev->hard_header_len;
835
836 macvlan_set_lockdep_class(dev);
837
838 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
839 if (!vlan->pcpu_stats)
840 return -ENOMEM;
841
842 port->count += 1;
843
844 return 0;
845 }
846
847 static void macvlan_uninit(struct net_device *dev)
848 {
849 struct macvlan_dev *vlan = netdev_priv(dev);
850 struct macvlan_port *port = vlan->port;
851
852 free_percpu(vlan->pcpu_stats);
853
854 macvlan_flush_sources(port, vlan);
855 port->count -= 1;
856 if (!port->count)
857 macvlan_port_destroy(port->dev);
858 }
859
860 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
861 struct rtnl_link_stats64 *stats)
862 {
863 struct macvlan_dev *vlan = netdev_priv(dev);
864
865 if (vlan->pcpu_stats) {
866 struct vlan_pcpu_stats *p;
867 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
868 u32 rx_errors = 0, tx_dropped = 0;
869 unsigned int start;
870 int i;
871
872 for_each_possible_cpu(i) {
873 p = per_cpu_ptr(vlan->pcpu_stats, i);
874 do {
875 start = u64_stats_fetch_begin_irq(&p->syncp);
876 rx_packets = p->rx_packets;
877 rx_bytes = p->rx_bytes;
878 rx_multicast = p->rx_multicast;
879 tx_packets = p->tx_packets;
880 tx_bytes = p->tx_bytes;
881 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
882
883 stats->rx_packets += rx_packets;
884 stats->rx_bytes += rx_bytes;
885 stats->multicast += rx_multicast;
886 stats->tx_packets += tx_packets;
887 stats->tx_bytes += tx_bytes;
888 /* rx_errors & tx_dropped are u32, updated
889 * without syncp protection.
890 */
891 rx_errors += p->rx_errors;
892 tx_dropped += p->tx_dropped;
893 }
894 stats->rx_errors = rx_errors;
895 stats->rx_dropped = rx_errors;
896 stats->tx_dropped = tx_dropped;
897 }
898 return stats;
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->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
1144 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1145 netdev_rx_handler_unregister(dev);
1146
1147 /* After this point, no packet can schedule bc_work anymore,
1148 * but we need to cancel it and purge left skbs if any.
1149 */
1150 cancel_work_sync(&port->bc_work);
1151 __skb_queue_purge(&port->bc_queue);
1152
1153 kfree_rcu(port, rcu);
1154 }
1155
1156 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1157 {
1158 if (tb[IFLA_ADDRESS]) {
1159 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1160 return -EINVAL;
1161 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1162 return -EADDRNOTAVAIL;
1163 }
1164
1165 if (data && data[IFLA_MACVLAN_FLAGS] &&
1166 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1167 return -EINVAL;
1168
1169 if (data && data[IFLA_MACVLAN_MODE]) {
1170 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1171 case MACVLAN_MODE_PRIVATE:
1172 case MACVLAN_MODE_VEPA:
1173 case MACVLAN_MODE_BRIDGE:
1174 case MACVLAN_MODE_PASSTHRU:
1175 case MACVLAN_MODE_SOURCE:
1176 break;
1177 default:
1178 return -EINVAL;
1179 }
1180 }
1181
1182 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1183 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1184 case MACVLAN_MACADDR_ADD:
1185 case MACVLAN_MACADDR_DEL:
1186 case MACVLAN_MACADDR_FLUSH:
1187 case MACVLAN_MACADDR_SET:
1188 break;
1189 default:
1190 return -EINVAL;
1191 }
1192 }
1193
1194 if (data && data[IFLA_MACVLAN_MACADDR]) {
1195 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1196 return -EINVAL;
1197
1198 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1199 return -EADDRNOTAVAIL;
1200 }
1201
1202 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1203 return -EINVAL;
1204
1205 return 0;
1206 }
1207
1208 /**
1209 * reconfigure list of remote source mac address
1210 * (only for macvlan devices in source mode)
1211 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1212 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1213 */
1214 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1215 struct nlattr *data[])
1216 {
1217 char *addr = NULL;
1218 int ret, rem, len;
1219 struct nlattr *nla, *head;
1220 struct macvlan_source_entry *entry;
1221
1222 if (data[IFLA_MACVLAN_MACADDR])
1223 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1224
1225 if (mode == MACVLAN_MACADDR_ADD) {
1226 if (!addr)
1227 return -EINVAL;
1228
1229 return macvlan_hash_add_source(vlan, addr);
1230
1231 } else if (mode == MACVLAN_MACADDR_DEL) {
1232 if (!addr)
1233 return -EINVAL;
1234
1235 entry = macvlan_hash_lookup_source(vlan, addr);
1236 if (entry) {
1237 macvlan_hash_del_source(entry);
1238 vlan->macaddr_count--;
1239 }
1240 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1241 macvlan_flush_sources(vlan->port, vlan);
1242 } else if (mode == MACVLAN_MACADDR_SET) {
1243 macvlan_flush_sources(vlan->port, vlan);
1244
1245 if (addr) {
1246 ret = macvlan_hash_add_source(vlan, addr);
1247 if (ret)
1248 return ret;
1249 }
1250
1251 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1252 return 0;
1253
1254 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1255 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1256
1257 nla_for_each_attr(nla, head, len, rem) {
1258 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1259 nla_len(nla) != ETH_ALEN)
1260 continue;
1261
1262 addr = nla_data(nla);
1263 ret = macvlan_hash_add_source(vlan, addr);
1264 if (ret)
1265 return ret;
1266 }
1267 } else {
1268 return -EINVAL;
1269 }
1270
1271 return 0;
1272 }
1273
1274 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1275 struct nlattr *tb[], struct nlattr *data[])
1276 {
1277 struct macvlan_dev *vlan = netdev_priv(dev);
1278 struct macvlan_port *port;
1279 struct net_device *lowerdev;
1280 int err;
1281 int macmode;
1282 bool create = false;
1283
1284 if (!tb[IFLA_LINK])
1285 return -EINVAL;
1286
1287 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1288 if (lowerdev == NULL)
1289 return -ENODEV;
1290
1291 /* When creating macvlans or macvtaps on top of other macvlans - use
1292 * the real device as the lowerdev.
1293 */
1294 if (netif_is_macvlan(lowerdev))
1295 lowerdev = macvlan_dev_real_dev(lowerdev);
1296
1297 if (!tb[IFLA_MTU])
1298 dev->mtu = lowerdev->mtu;
1299 else if (dev->mtu > lowerdev->mtu)
1300 return -EINVAL;
1301
1302 if (!tb[IFLA_ADDRESS])
1303 eth_hw_addr_random(dev);
1304
1305 if (!macvlan_port_exists(lowerdev)) {
1306 err = macvlan_port_create(lowerdev);
1307 if (err < 0)
1308 return err;
1309 create = true;
1310 }
1311 port = macvlan_port_get_rtnl(lowerdev);
1312
1313 /* Only 1 macvlan device can be created in passthru mode */
1314 if (port->passthru) {
1315 /* The macvlan port must be not created this time,
1316 * still goto destroy_macvlan_port for readability.
1317 */
1318 err = -EINVAL;
1319 goto destroy_macvlan_port;
1320 }
1321
1322 vlan->lowerdev = lowerdev;
1323 vlan->dev = dev;
1324 vlan->port = port;
1325 vlan->set_features = MACVLAN_FEATURES;
1326 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1327
1328 vlan->mode = MACVLAN_MODE_VEPA;
1329 if (data && data[IFLA_MACVLAN_MODE])
1330 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1331
1332 if (data && data[IFLA_MACVLAN_FLAGS])
1333 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1334
1335 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1336 if (port->count) {
1337 err = -EINVAL;
1338 goto destroy_macvlan_port;
1339 }
1340 port->passthru = true;
1341 eth_hw_addr_inherit(dev, lowerdev);
1342 }
1343
1344 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1345 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1346 err = -EINVAL;
1347 goto destroy_macvlan_port;
1348 }
1349 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1350 err = macvlan_changelink_sources(vlan, macmode, data);
1351 if (err)
1352 goto destroy_macvlan_port;
1353 }
1354
1355 err = register_netdevice(dev);
1356 if (err < 0)
1357 goto destroy_macvlan_port;
1358
1359 dev->priv_flags |= IFF_MACVLAN;
1360 err = netdev_upper_dev_link(lowerdev, dev);
1361 if (err)
1362 goto unregister_netdev;
1363
1364 list_add_tail_rcu(&vlan->list, &port->vlans);
1365 netif_stacked_transfer_operstate(lowerdev, dev);
1366 linkwatch_fire_event(dev);
1367
1368 return 0;
1369
1370 unregister_netdev:
1371 unregister_netdevice(dev);
1372 destroy_macvlan_port:
1373 if (create)
1374 macvlan_port_destroy(port->dev);
1375 return err;
1376 }
1377 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1378
1379 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1380 struct nlattr *tb[], struct nlattr *data[])
1381 {
1382 return macvlan_common_newlink(src_net, dev, tb, data);
1383 }
1384
1385 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1386 {
1387 struct macvlan_dev *vlan = netdev_priv(dev);
1388
1389 if (vlan->mode == MACVLAN_MODE_SOURCE)
1390 macvlan_flush_sources(vlan->port, vlan);
1391 list_del_rcu(&vlan->list);
1392 unregister_netdevice_queue(dev, head);
1393 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1394 }
1395 EXPORT_SYMBOL_GPL(macvlan_dellink);
1396
1397 static int macvlan_changelink(struct net_device *dev,
1398 struct nlattr *tb[], struct nlattr *data[])
1399 {
1400 struct macvlan_dev *vlan = netdev_priv(dev);
1401 enum macvlan_mode mode;
1402 bool set_mode = false;
1403 enum macvlan_macaddr_mode macmode;
1404 int ret;
1405
1406 /* Validate mode, but don't set yet: setting flags may fail. */
1407 if (data && data[IFLA_MACVLAN_MODE]) {
1408 set_mode = true;
1409 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1410 /* Passthrough mode can't be set or cleared dynamically */
1411 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1412 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1413 return -EINVAL;
1414 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1415 vlan->mode != mode)
1416 macvlan_flush_sources(vlan->port, vlan);
1417 }
1418
1419 if (data && data[IFLA_MACVLAN_FLAGS]) {
1420 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1421 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1422 if (vlan->port->passthru && promisc) {
1423 int err;
1424
1425 if (flags & MACVLAN_FLAG_NOPROMISC)
1426 err = dev_set_promiscuity(vlan->lowerdev, -1);
1427 else
1428 err = dev_set_promiscuity(vlan->lowerdev, 1);
1429 if (err < 0)
1430 return err;
1431 }
1432 vlan->flags = flags;
1433 }
1434 if (set_mode)
1435 vlan->mode = mode;
1436 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1437 if (vlan->mode != MACVLAN_MODE_SOURCE)
1438 return -EINVAL;
1439 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1440 ret = macvlan_changelink_sources(vlan, macmode, data);
1441 if (ret)
1442 return ret;
1443 }
1444 return 0;
1445 }
1446
1447 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1448 {
1449 if (vlan->macaddr_count == 0)
1450 return 0;
1451 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1452 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1453 }
1454
1455 static size_t macvlan_get_size(const struct net_device *dev)
1456 {
1457 struct macvlan_dev *vlan = netdev_priv(dev);
1458
1459 return (0
1460 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1461 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1462 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1463 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1464 );
1465 }
1466
1467 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1468 const struct macvlan_dev *vlan,
1469 const int i)
1470 {
1471 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1472 struct macvlan_source_entry *entry;
1473
1474 hlist_for_each_entry_rcu(entry, h, hlist) {
1475 if (entry->vlan != vlan)
1476 continue;
1477 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1478 return 1;
1479 }
1480 return 0;
1481 }
1482
1483 static int macvlan_fill_info(struct sk_buff *skb,
1484 const struct net_device *dev)
1485 {
1486 struct macvlan_dev *vlan = netdev_priv(dev);
1487 int i;
1488 struct nlattr *nest;
1489
1490 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1491 goto nla_put_failure;
1492 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1493 goto nla_put_failure;
1494 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1495 goto nla_put_failure;
1496 if (vlan->macaddr_count > 0) {
1497 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1498 if (nest == NULL)
1499 goto nla_put_failure;
1500
1501 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1502 if (macvlan_fill_info_macaddr(skb, vlan, i))
1503 goto nla_put_failure;
1504 }
1505 nla_nest_end(skb, nest);
1506 }
1507 return 0;
1508
1509 nla_put_failure:
1510 return -EMSGSIZE;
1511 }
1512
1513 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1514 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1515 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1516 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1517 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1518 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1519 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1520 };
1521
1522 int macvlan_link_register(struct rtnl_link_ops *ops)
1523 {
1524 /* common fields */
1525 ops->priv_size = sizeof(struct macvlan_dev);
1526 ops->validate = macvlan_validate;
1527 ops->maxtype = IFLA_MACVLAN_MAX;
1528 ops->policy = macvlan_policy;
1529 ops->changelink = macvlan_changelink;
1530 ops->get_size = macvlan_get_size;
1531 ops->fill_info = macvlan_fill_info;
1532
1533 return rtnl_link_register(ops);
1534 };
1535 EXPORT_SYMBOL_GPL(macvlan_link_register);
1536
1537 static struct net *macvlan_get_link_net(const struct net_device *dev)
1538 {
1539 return dev_net(macvlan_dev_real_dev(dev));
1540 }
1541
1542 static struct rtnl_link_ops macvlan_link_ops = {
1543 .kind = "macvlan",
1544 .setup = macvlan_setup,
1545 .newlink = macvlan_newlink,
1546 .dellink = macvlan_dellink,
1547 .get_link_net = macvlan_get_link_net,
1548 };
1549
1550 static int macvlan_device_event(struct notifier_block *unused,
1551 unsigned long event, void *ptr)
1552 {
1553 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1554 struct macvlan_dev *vlan, *next;
1555 struct macvlan_port *port;
1556 LIST_HEAD(list_kill);
1557
1558 if (!macvlan_port_exists(dev))
1559 return NOTIFY_DONE;
1560
1561 port = macvlan_port_get_rtnl(dev);
1562
1563 switch (event) {
1564 case NETDEV_UP:
1565 case NETDEV_CHANGE:
1566 list_for_each_entry(vlan, &port->vlans, list)
1567 netif_stacked_transfer_operstate(vlan->lowerdev,
1568 vlan->dev);
1569 break;
1570 case NETDEV_FEAT_CHANGE:
1571 list_for_each_entry(vlan, &port->vlans, list) {
1572 vlan->dev->gso_max_size = dev->gso_max_size;
1573 vlan->dev->gso_max_segs = dev->gso_max_segs;
1574 netdev_update_features(vlan->dev);
1575 }
1576 break;
1577 case NETDEV_CHANGEMTU:
1578 list_for_each_entry(vlan, &port->vlans, list) {
1579 if (vlan->dev->mtu <= dev->mtu)
1580 continue;
1581 dev_set_mtu(vlan->dev, dev->mtu);
1582 }
1583 break;
1584 case NETDEV_CHANGEADDR:
1585 if (!port->passthru)
1586 return NOTIFY_DONE;
1587
1588 vlan = list_first_entry_or_null(&port->vlans,
1589 struct macvlan_dev,
1590 list);
1591
1592 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1593 return NOTIFY_BAD;
1594
1595 break;
1596 case NETDEV_UNREGISTER:
1597 /* twiddle thumbs on netns device moves */
1598 if (dev->reg_state != NETREG_UNREGISTERING)
1599 break;
1600
1601 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1602 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1603 unregister_netdevice_many(&list_kill);
1604 break;
1605 case NETDEV_PRE_TYPE_CHANGE:
1606 /* Forbid underlaying device to change its type. */
1607 return NOTIFY_BAD;
1608
1609 case NETDEV_NOTIFY_PEERS:
1610 case NETDEV_BONDING_FAILOVER:
1611 case NETDEV_RESEND_IGMP:
1612 /* Propagate to all vlans */
1613 list_for_each_entry(vlan, &port->vlans, list)
1614 call_netdevice_notifiers(event, vlan->dev);
1615 }
1616 return NOTIFY_DONE;
1617 }
1618
1619 static struct notifier_block macvlan_notifier_block __read_mostly = {
1620 .notifier_call = macvlan_device_event,
1621 };
1622
1623 static int __init macvlan_init_module(void)
1624 {
1625 int err;
1626
1627 register_netdevice_notifier(&macvlan_notifier_block);
1628
1629 err = macvlan_link_register(&macvlan_link_ops);
1630 if (err < 0)
1631 goto err1;
1632 return 0;
1633 err1:
1634 unregister_netdevice_notifier(&macvlan_notifier_block);
1635 return err;
1636 }
1637
1638 static void __exit macvlan_cleanup_module(void)
1639 {
1640 rtnl_link_unregister(&macvlan_link_ops);
1641 unregister_netdevice_notifier(&macvlan_notifier_block);
1642 }
1643
1644 module_init(macvlan_init_module);
1645 module_exit(macvlan_cleanup_module);
1646
1647 MODULE_LICENSE("GPL");
1648 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1649 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1650 MODULE_ALIAS_RTNL_LINK("macvlan");
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