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Merge tag 'iio-fixes-for-3.19a' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.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 };
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 int 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 1;
190
191 if (macvlan_hash_lookup(port, addr))
192 return 1;
193
194 return 0;
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 kfree_skb(skb);
309 }
310 }
311
312 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
313 struct sk_buff *skb)
314 {
315 struct sk_buff *nskb;
316 int err = -ENOMEM;
317
318 nskb = skb_clone(skb, GFP_ATOMIC);
319 if (!nskb)
320 goto err;
321
322 spin_lock(&port->bc_queue.lock);
323 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
324 __skb_queue_tail(&port->bc_queue, nskb);
325 err = 0;
326 }
327 spin_unlock(&port->bc_queue.lock);
328
329 if (err)
330 goto free_nskb;
331
332 schedule_work(&port->bc_work);
333 return;
334
335 free_nskb:
336 kfree_skb(nskb);
337 err:
338 atomic_long_inc(&skb->dev->rx_dropped);
339 }
340
341 static void macvlan_flush_sources(struct macvlan_port *port,
342 struct macvlan_dev *vlan)
343 {
344 int i;
345
346 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
347 struct hlist_node *h, *n;
348
349 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
350 struct macvlan_source_entry *entry;
351
352 entry = hlist_entry(h, struct macvlan_source_entry,
353 hlist);
354 if (entry->vlan == vlan)
355 macvlan_hash_del_source(entry);
356 }
357 }
358 vlan->macaddr_count = 0;
359 }
360
361 static void macvlan_forward_source_one(struct sk_buff *skb,
362 struct macvlan_dev *vlan)
363 {
364 struct sk_buff *nskb;
365 struct net_device *dev;
366 int len;
367 int ret;
368
369 dev = vlan->dev;
370 if (unlikely(!(dev->flags & IFF_UP)))
371 return;
372
373 nskb = skb_clone(skb, GFP_ATOMIC);
374 if (!nskb)
375 return;
376
377 len = nskb->len + ETH_HLEN;
378 nskb->dev = dev;
379 nskb->pkt_type = PACKET_HOST;
380
381 ret = netif_rx(nskb);
382 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
383 }
384
385 static void macvlan_forward_source(struct sk_buff *skb,
386 struct macvlan_port *port,
387 const unsigned char *addr)
388 {
389 struct macvlan_source_entry *entry;
390 u32 idx = macvlan_eth_hash(addr);
391 struct hlist_head *h = &port->vlan_source_hash[idx];
392
393 hlist_for_each_entry_rcu(entry, h, hlist) {
394 if (ether_addr_equal_64bits(entry->addr, addr))
395 if (entry->vlan->dev->flags & IFF_UP)
396 macvlan_forward_source_one(skb, entry->vlan);
397 }
398 }
399
400 /* called under rcu_read_lock() from netif_receive_skb */
401 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
402 {
403 struct macvlan_port *port;
404 struct sk_buff *skb = *pskb;
405 const struct ethhdr *eth = eth_hdr(skb);
406 const struct macvlan_dev *vlan;
407 const struct macvlan_dev *src;
408 struct net_device *dev;
409 unsigned int len = 0;
410 int ret;
411 rx_handler_result_t handle_res;
412
413 port = macvlan_port_get_rcu(skb->dev);
414 if (is_multicast_ether_addr(eth->h_dest)) {
415 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
416 if (!skb)
417 return RX_HANDLER_CONSUMED;
418 eth = eth_hdr(skb);
419 macvlan_forward_source(skb, port, eth->h_source);
420 src = macvlan_hash_lookup(port, eth->h_source);
421 if (src && src->mode != MACVLAN_MODE_VEPA &&
422 src->mode != MACVLAN_MODE_BRIDGE) {
423 /* forward to original port. */
424 vlan = src;
425 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
426 netif_rx(skb);
427 handle_res = RX_HANDLER_CONSUMED;
428 goto out;
429 }
430
431 MACVLAN_SKB_CB(skb)->src = src;
432 macvlan_broadcast_enqueue(port, skb);
433
434 return RX_HANDLER_PASS;
435 }
436
437 macvlan_forward_source(skb, port, eth->h_source);
438 if (port->passthru)
439 vlan = list_first_or_null_rcu(&port->vlans,
440 struct macvlan_dev, list);
441 else
442 vlan = macvlan_hash_lookup(port, eth->h_dest);
443 if (vlan == NULL)
444 return RX_HANDLER_PASS;
445
446 dev = vlan->dev;
447 if (unlikely(!(dev->flags & IFF_UP))) {
448 kfree_skb(skb);
449 return RX_HANDLER_CONSUMED;
450 }
451 len = skb->len + ETH_HLEN;
452 skb = skb_share_check(skb, GFP_ATOMIC);
453 if (!skb) {
454 ret = NET_RX_DROP;
455 handle_res = RX_HANDLER_CONSUMED;
456 goto out;
457 }
458
459 skb->dev = dev;
460 skb->pkt_type = PACKET_HOST;
461
462 ret = NET_RX_SUCCESS;
463 handle_res = RX_HANDLER_ANOTHER;
464 out:
465 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
466 return handle_res;
467 }
468
469 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
470 {
471 const struct macvlan_dev *vlan = netdev_priv(dev);
472 const struct macvlan_port *port = vlan->port;
473 const struct macvlan_dev *dest;
474
475 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
476 const struct ethhdr *eth = (void *)skb->data;
477
478 /* send to other bridge ports directly */
479 if (is_multicast_ether_addr(eth->h_dest)) {
480 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
481 goto xmit_world;
482 }
483
484 dest = macvlan_hash_lookup(port, eth->h_dest);
485 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
486 /* send to lowerdev first for its network taps */
487 dev_forward_skb(vlan->lowerdev, skb);
488
489 return NET_XMIT_SUCCESS;
490 }
491 }
492
493 xmit_world:
494 skb->dev = vlan->lowerdev;
495 return dev_queue_xmit(skb);
496 }
497
498 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
499 {
500 #ifdef CONFIG_NET_POLL_CONTROLLER
501 if (vlan->netpoll)
502 netpoll_send_skb(vlan->netpoll, skb);
503 #else
504 BUG();
505 #endif
506 return NETDEV_TX_OK;
507 }
508
509 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
510 struct net_device *dev)
511 {
512 unsigned int len = skb->len;
513 int ret;
514 struct macvlan_dev *vlan = netdev_priv(dev);
515
516 if (unlikely(netpoll_tx_running(dev)))
517 return macvlan_netpoll_send_skb(vlan, skb);
518
519 if (vlan->fwd_priv) {
520 skb->dev = vlan->lowerdev;
521 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
522 } else {
523 ret = macvlan_queue_xmit(skb, dev);
524 }
525
526 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
527 struct vlan_pcpu_stats *pcpu_stats;
528
529 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
530 u64_stats_update_begin(&pcpu_stats->syncp);
531 pcpu_stats->tx_packets++;
532 pcpu_stats->tx_bytes += len;
533 u64_stats_update_end(&pcpu_stats->syncp);
534 } else {
535 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
536 }
537 return ret;
538 }
539
540 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
541 unsigned short type, const void *daddr,
542 const void *saddr, unsigned len)
543 {
544 const struct macvlan_dev *vlan = netdev_priv(dev);
545 struct net_device *lowerdev = vlan->lowerdev;
546
547 return dev_hard_header(skb, lowerdev, type, daddr,
548 saddr ? : dev->dev_addr, len);
549 }
550
551 static const struct header_ops macvlan_hard_header_ops = {
552 .create = macvlan_hard_header,
553 .rebuild = eth_rebuild_header,
554 .parse = eth_header_parse,
555 .cache = eth_header_cache,
556 .cache_update = eth_header_cache_update,
557 };
558
559 static struct rtnl_link_ops macvlan_link_ops;
560
561 static int macvlan_open(struct net_device *dev)
562 {
563 struct macvlan_dev *vlan = netdev_priv(dev);
564 struct net_device *lowerdev = vlan->lowerdev;
565 int err;
566
567 if (vlan->port->passthru) {
568 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
569 err = dev_set_promiscuity(lowerdev, 1);
570 if (err < 0)
571 goto out;
572 }
573 goto hash_add;
574 }
575
576 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
577 dev->rtnl_link_ops == &macvlan_link_ops) {
578 vlan->fwd_priv =
579 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
580
581 /* If we get a NULL pointer back, or if we get an error
582 * then we should just fall through to the non accelerated path
583 */
584 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
585 vlan->fwd_priv = NULL;
586 } else
587 return 0;
588 }
589
590 err = -EBUSY;
591 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
592 goto out;
593
594 err = dev_uc_add(lowerdev, dev->dev_addr);
595 if (err < 0)
596 goto out;
597 if (dev->flags & IFF_ALLMULTI) {
598 err = dev_set_allmulti(lowerdev, 1);
599 if (err < 0)
600 goto del_unicast;
601 }
602
603 hash_add:
604 macvlan_hash_add(vlan);
605 return 0;
606
607 del_unicast:
608 dev_uc_del(lowerdev, dev->dev_addr);
609 out:
610 if (vlan->fwd_priv) {
611 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
612 vlan->fwd_priv);
613 vlan->fwd_priv = NULL;
614 }
615 return err;
616 }
617
618 static int macvlan_stop(struct net_device *dev)
619 {
620 struct macvlan_dev *vlan = netdev_priv(dev);
621 struct net_device *lowerdev = vlan->lowerdev;
622
623 if (vlan->fwd_priv) {
624 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
625 vlan->fwd_priv);
626 vlan->fwd_priv = NULL;
627 return 0;
628 }
629
630 dev_uc_unsync(lowerdev, dev);
631 dev_mc_unsync(lowerdev, dev);
632
633 if (vlan->port->passthru) {
634 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
635 dev_set_promiscuity(lowerdev, -1);
636 goto hash_del;
637 }
638
639 if (dev->flags & IFF_ALLMULTI)
640 dev_set_allmulti(lowerdev, -1);
641
642 dev_uc_del(lowerdev, dev->dev_addr);
643
644 hash_del:
645 macvlan_hash_del(vlan, !dev->dismantle);
646 return 0;
647 }
648
649 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
650 {
651 struct macvlan_dev *vlan = netdev_priv(dev);
652 struct net_device *lowerdev = vlan->lowerdev;
653 int err;
654
655 if (!(dev->flags & IFF_UP)) {
656 /* Just copy in the new address */
657 ether_addr_copy(dev->dev_addr, addr);
658 } else {
659 /* Rehash and update the device filters */
660 if (macvlan_addr_busy(vlan->port, addr))
661 return -EBUSY;
662
663 if (!vlan->port->passthru) {
664 err = dev_uc_add(lowerdev, addr);
665 if (err)
666 return err;
667
668 dev_uc_del(lowerdev, dev->dev_addr);
669 }
670
671 macvlan_hash_change_addr(vlan, addr);
672 }
673 return 0;
674 }
675
676 static int macvlan_set_mac_address(struct net_device *dev, void *p)
677 {
678 struct macvlan_dev *vlan = netdev_priv(dev);
679 struct sockaddr *addr = p;
680
681 if (!is_valid_ether_addr(addr->sa_data))
682 return -EADDRNOTAVAIL;
683
684 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
685 dev_set_mac_address(vlan->lowerdev, addr);
686 return 0;
687 }
688
689 return macvlan_sync_address(dev, addr->sa_data);
690 }
691
692 static void macvlan_change_rx_flags(struct net_device *dev, int change)
693 {
694 struct macvlan_dev *vlan = netdev_priv(dev);
695 struct net_device *lowerdev = vlan->lowerdev;
696
697 if (dev->flags & IFF_UP) {
698 if (change & IFF_ALLMULTI)
699 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
700 }
701 }
702
703 static void macvlan_set_mac_lists(struct net_device *dev)
704 {
705 struct macvlan_dev *vlan = netdev_priv(dev);
706
707 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
708 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
709 } else {
710 struct netdev_hw_addr *ha;
711 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
712
713 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
714 netdev_for_each_mc_addr(ha, dev) {
715 __set_bit(mc_hash(vlan, ha->addr), filter);
716 }
717
718 __set_bit(mc_hash(vlan, dev->broadcast), filter);
719
720 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
721 }
722 dev_uc_sync(vlan->lowerdev, dev);
723 dev_mc_sync(vlan->lowerdev, dev);
724 }
725
726 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
727 {
728 struct macvlan_dev *vlan = netdev_priv(dev);
729
730 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
731 return -EINVAL;
732 dev->mtu = new_mtu;
733 return 0;
734 }
735
736 /*
737 * macvlan network devices have devices nesting below it and are a special
738 * "super class" of normal network devices; split their locks off into a
739 * separate class since they always nest.
740 */
741 static struct lock_class_key macvlan_netdev_xmit_lock_key;
742 static struct lock_class_key macvlan_netdev_addr_lock_key;
743
744 #define ALWAYS_ON_FEATURES \
745 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
746 NETIF_F_GSO_ROBUST)
747
748 #define MACVLAN_FEATURES \
749 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
750 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
751 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
752 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
753
754 #define MACVLAN_STATE_MASK \
755 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
756
757 static int macvlan_get_nest_level(struct net_device *dev)
758 {
759 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
760 }
761
762 static void macvlan_set_lockdep_class_one(struct net_device *dev,
763 struct netdev_queue *txq,
764 void *_unused)
765 {
766 lockdep_set_class(&txq->_xmit_lock,
767 &macvlan_netdev_xmit_lock_key);
768 }
769
770 static void macvlan_set_lockdep_class(struct net_device *dev)
771 {
772 lockdep_set_class_and_subclass(&dev->addr_list_lock,
773 &macvlan_netdev_addr_lock_key,
774 macvlan_get_nest_level(dev));
775 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
776 }
777
778 static int macvlan_init(struct net_device *dev)
779 {
780 struct macvlan_dev *vlan = netdev_priv(dev);
781 const struct net_device *lowerdev = vlan->lowerdev;
782
783 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
784 (lowerdev->state & MACVLAN_STATE_MASK);
785 dev->features = lowerdev->features & MACVLAN_FEATURES;
786 dev->features |= ALWAYS_ON_FEATURES;
787 dev->hw_features |= NETIF_F_LRO;
788 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
789 dev->gso_max_size = lowerdev->gso_max_size;
790 dev->iflink = lowerdev->ifindex;
791 dev->hard_header_len = lowerdev->hard_header_len;
792
793 macvlan_set_lockdep_class(dev);
794
795 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
796 if (!vlan->pcpu_stats)
797 return -ENOMEM;
798
799 return 0;
800 }
801
802 static void macvlan_uninit(struct net_device *dev)
803 {
804 struct macvlan_dev *vlan = netdev_priv(dev);
805 struct macvlan_port *port = vlan->port;
806
807 free_percpu(vlan->pcpu_stats);
808
809 macvlan_flush_sources(port, vlan);
810 port->count -= 1;
811 if (!port->count)
812 macvlan_port_destroy(port->dev);
813 }
814
815 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
816 struct rtnl_link_stats64 *stats)
817 {
818 struct macvlan_dev *vlan = netdev_priv(dev);
819
820 if (vlan->pcpu_stats) {
821 struct vlan_pcpu_stats *p;
822 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
823 u32 rx_errors = 0, tx_dropped = 0;
824 unsigned int start;
825 int i;
826
827 for_each_possible_cpu(i) {
828 p = per_cpu_ptr(vlan->pcpu_stats, i);
829 do {
830 start = u64_stats_fetch_begin_irq(&p->syncp);
831 rx_packets = p->rx_packets;
832 rx_bytes = p->rx_bytes;
833 rx_multicast = p->rx_multicast;
834 tx_packets = p->tx_packets;
835 tx_bytes = p->tx_bytes;
836 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
837
838 stats->rx_packets += rx_packets;
839 stats->rx_bytes += rx_bytes;
840 stats->multicast += rx_multicast;
841 stats->tx_packets += tx_packets;
842 stats->tx_bytes += tx_bytes;
843 /* rx_errors & tx_dropped are u32, updated
844 * without syncp protection.
845 */
846 rx_errors += p->rx_errors;
847 tx_dropped += p->tx_dropped;
848 }
849 stats->rx_errors = rx_errors;
850 stats->rx_dropped = rx_errors;
851 stats->tx_dropped = tx_dropped;
852 }
853 return stats;
854 }
855
856 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
857 __be16 proto, u16 vid)
858 {
859 struct macvlan_dev *vlan = netdev_priv(dev);
860 struct net_device *lowerdev = vlan->lowerdev;
861
862 return vlan_vid_add(lowerdev, proto, vid);
863 }
864
865 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
866 __be16 proto, u16 vid)
867 {
868 struct macvlan_dev *vlan = netdev_priv(dev);
869 struct net_device *lowerdev = vlan->lowerdev;
870
871 vlan_vid_del(lowerdev, proto, vid);
872 return 0;
873 }
874
875 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
876 struct net_device *dev,
877 const unsigned char *addr, u16 vid,
878 u16 flags)
879 {
880 struct macvlan_dev *vlan = netdev_priv(dev);
881 int err = -EINVAL;
882
883 /* Support unicast filter only on passthru devices.
884 * Multicast filter should be allowed on all devices.
885 */
886 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
887 return -EOPNOTSUPP;
888
889 if (flags & NLM_F_REPLACE)
890 return -EOPNOTSUPP;
891
892 if (is_unicast_ether_addr(addr))
893 err = dev_uc_add_excl(dev, addr);
894 else if (is_multicast_ether_addr(addr))
895 err = dev_mc_add_excl(dev, addr);
896
897 return err;
898 }
899
900 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
901 struct net_device *dev,
902 const unsigned char *addr, u16 vid)
903 {
904 struct macvlan_dev *vlan = netdev_priv(dev);
905 int err = -EINVAL;
906
907 /* Support unicast filter only on passthru devices.
908 * Multicast filter should be allowed on all devices.
909 */
910 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
911 return -EOPNOTSUPP;
912
913 if (is_unicast_ether_addr(addr))
914 err = dev_uc_del(dev, addr);
915 else if (is_multicast_ether_addr(addr))
916 err = dev_mc_del(dev, addr);
917
918 return err;
919 }
920
921 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
922 struct ethtool_drvinfo *drvinfo)
923 {
924 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
925 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
926 }
927
928 static int macvlan_ethtool_get_settings(struct net_device *dev,
929 struct ethtool_cmd *cmd)
930 {
931 const struct macvlan_dev *vlan = netdev_priv(dev);
932
933 return __ethtool_get_settings(vlan->lowerdev, cmd);
934 }
935
936 static netdev_features_t macvlan_fix_features(struct net_device *dev,
937 netdev_features_t features)
938 {
939 struct macvlan_dev *vlan = netdev_priv(dev);
940 netdev_features_t lowerdev_features = vlan->lowerdev->features;
941 netdev_features_t mask;
942
943 features |= NETIF_F_ALL_FOR_ALL;
944 features &= (vlan->set_features | ~MACVLAN_FEATURES);
945 mask = features;
946
947 lowerdev_features &= (features | ~NETIF_F_LRO);
948 features = netdev_increment_features(lowerdev_features, features, mask);
949 features |= ALWAYS_ON_FEATURES;
950 features &= ~NETIF_F_NETNS_LOCAL;
951
952 return features;
953 }
954
955 #ifdef CONFIG_NET_POLL_CONTROLLER
956 static void macvlan_dev_poll_controller(struct net_device *dev)
957 {
958 return;
959 }
960
961 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
962 {
963 struct macvlan_dev *vlan = netdev_priv(dev);
964 struct net_device *real_dev = vlan->lowerdev;
965 struct netpoll *netpoll;
966 int err = 0;
967
968 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
969 err = -ENOMEM;
970 if (!netpoll)
971 goto out;
972
973 err = __netpoll_setup(netpoll, real_dev);
974 if (err) {
975 kfree(netpoll);
976 goto out;
977 }
978
979 vlan->netpoll = netpoll;
980
981 out:
982 return err;
983 }
984
985 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
986 {
987 struct macvlan_dev *vlan = netdev_priv(dev);
988 struct netpoll *netpoll = vlan->netpoll;
989
990 if (!netpoll)
991 return;
992
993 vlan->netpoll = NULL;
994
995 __netpoll_free_async(netpoll);
996 }
997 #endif /* CONFIG_NET_POLL_CONTROLLER */
998
999 static const struct ethtool_ops macvlan_ethtool_ops = {
1000 .get_link = ethtool_op_get_link,
1001 .get_settings = macvlan_ethtool_get_settings,
1002 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1003 };
1004
1005 static const struct net_device_ops macvlan_netdev_ops = {
1006 .ndo_init = macvlan_init,
1007 .ndo_uninit = macvlan_uninit,
1008 .ndo_open = macvlan_open,
1009 .ndo_stop = macvlan_stop,
1010 .ndo_start_xmit = macvlan_start_xmit,
1011 .ndo_change_mtu = macvlan_change_mtu,
1012 .ndo_fix_features = macvlan_fix_features,
1013 .ndo_change_rx_flags = macvlan_change_rx_flags,
1014 .ndo_set_mac_address = macvlan_set_mac_address,
1015 .ndo_set_rx_mode = macvlan_set_mac_lists,
1016 .ndo_get_stats64 = macvlan_dev_get_stats64,
1017 .ndo_validate_addr = eth_validate_addr,
1018 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1019 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1020 .ndo_fdb_add = macvlan_fdb_add,
1021 .ndo_fdb_del = macvlan_fdb_del,
1022 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1023 .ndo_get_lock_subclass = macvlan_get_nest_level,
1024 #ifdef CONFIG_NET_POLL_CONTROLLER
1025 .ndo_poll_controller = macvlan_dev_poll_controller,
1026 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1027 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1028 #endif
1029 };
1030
1031 void macvlan_common_setup(struct net_device *dev)
1032 {
1033 ether_setup(dev);
1034
1035 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1036 netif_keep_dst(dev);
1037 dev->priv_flags |= IFF_UNICAST_FLT;
1038 dev->netdev_ops = &macvlan_netdev_ops;
1039 dev->destructor = free_netdev;
1040 dev->header_ops = &macvlan_hard_header_ops;
1041 dev->ethtool_ops = &macvlan_ethtool_ops;
1042 }
1043 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1044
1045 static void macvlan_setup(struct net_device *dev)
1046 {
1047 macvlan_common_setup(dev);
1048 dev->tx_queue_len = 0;
1049 }
1050
1051 static int macvlan_port_create(struct net_device *dev)
1052 {
1053 struct macvlan_port *port;
1054 unsigned int i;
1055 int err;
1056
1057 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1058 return -EINVAL;
1059
1060 if (netif_is_ipvlan_port(dev))
1061 return -EBUSY;
1062
1063 port = kzalloc(sizeof(*port), GFP_KERNEL);
1064 if (port == NULL)
1065 return -ENOMEM;
1066
1067 port->passthru = false;
1068 port->dev = dev;
1069 INIT_LIST_HEAD(&port->vlans);
1070 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1071 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1072 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1073 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1074
1075 skb_queue_head_init(&port->bc_queue);
1076 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1077
1078 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1079 if (err)
1080 kfree(port);
1081 else
1082 dev->priv_flags |= IFF_MACVLAN_PORT;
1083 return err;
1084 }
1085
1086 static void macvlan_port_destroy(struct net_device *dev)
1087 {
1088 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1089
1090 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1091 netdev_rx_handler_unregister(dev);
1092
1093 /* After this point, no packet can schedule bc_work anymore,
1094 * but we need to cancel it and purge left skbs if any.
1095 */
1096 cancel_work_sync(&port->bc_work);
1097 __skb_queue_purge(&port->bc_queue);
1098
1099 kfree_rcu(port, rcu);
1100 }
1101
1102 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1103 {
1104 if (tb[IFLA_ADDRESS]) {
1105 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1106 return -EINVAL;
1107 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1108 return -EADDRNOTAVAIL;
1109 }
1110
1111 if (data && data[IFLA_MACVLAN_FLAGS] &&
1112 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1113 return -EINVAL;
1114
1115 if (data && data[IFLA_MACVLAN_MODE]) {
1116 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1117 case MACVLAN_MODE_PRIVATE:
1118 case MACVLAN_MODE_VEPA:
1119 case MACVLAN_MODE_BRIDGE:
1120 case MACVLAN_MODE_PASSTHRU:
1121 case MACVLAN_MODE_SOURCE:
1122 break;
1123 default:
1124 return -EINVAL;
1125 }
1126 }
1127
1128 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1129 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1130 case MACVLAN_MACADDR_ADD:
1131 case MACVLAN_MACADDR_DEL:
1132 case MACVLAN_MACADDR_FLUSH:
1133 case MACVLAN_MACADDR_SET:
1134 break;
1135 default:
1136 return -EINVAL;
1137 }
1138 }
1139
1140 if (data && data[IFLA_MACVLAN_MACADDR]) {
1141 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1142 return -EINVAL;
1143
1144 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1145 return -EADDRNOTAVAIL;
1146 }
1147
1148 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1149 return -EINVAL;
1150
1151 return 0;
1152 }
1153
1154 /**
1155 * reconfigure list of remote source mac address
1156 * (only for macvlan devices in source mode)
1157 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1158 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1159 */
1160 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1161 struct nlattr *data[])
1162 {
1163 char *addr = NULL;
1164 int ret, rem, len;
1165 struct nlattr *nla, *head;
1166 struct macvlan_source_entry *entry;
1167
1168 if (data[IFLA_MACVLAN_MACADDR])
1169 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1170
1171 if (mode == MACVLAN_MACADDR_ADD) {
1172 if (!addr)
1173 return -EINVAL;
1174
1175 return macvlan_hash_add_source(vlan, addr);
1176
1177 } else if (mode == MACVLAN_MACADDR_DEL) {
1178 if (!addr)
1179 return -EINVAL;
1180
1181 entry = macvlan_hash_lookup_source(vlan, addr);
1182 if (entry) {
1183 macvlan_hash_del_source(entry);
1184 vlan->macaddr_count--;
1185 }
1186 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1187 macvlan_flush_sources(vlan->port, vlan);
1188 } else if (mode == MACVLAN_MACADDR_SET) {
1189 macvlan_flush_sources(vlan->port, vlan);
1190
1191 if (addr) {
1192 ret = macvlan_hash_add_source(vlan, addr);
1193 if (ret)
1194 return ret;
1195 }
1196
1197 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1198 return 0;
1199
1200 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1201 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1202
1203 nla_for_each_attr(nla, head, len, rem) {
1204 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1205 nla_len(nla) != ETH_ALEN)
1206 continue;
1207
1208 addr = nla_data(nla);
1209 ret = macvlan_hash_add_source(vlan, addr);
1210 if (ret)
1211 return ret;
1212 }
1213 } else {
1214 return -EINVAL;
1215 }
1216
1217 return 0;
1218 }
1219
1220 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1221 struct nlattr *tb[], struct nlattr *data[])
1222 {
1223 struct macvlan_dev *vlan = netdev_priv(dev);
1224 struct macvlan_port *port;
1225 struct net_device *lowerdev;
1226 int err;
1227 int macmode;
1228
1229 if (!tb[IFLA_LINK])
1230 return -EINVAL;
1231
1232 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1233 if (lowerdev == NULL)
1234 return -ENODEV;
1235
1236 /* When creating macvlans or macvtaps on top of other macvlans - use
1237 * the real device as the lowerdev.
1238 */
1239 if (netif_is_macvlan(lowerdev))
1240 lowerdev = macvlan_dev_real_dev(lowerdev);
1241
1242 if (!tb[IFLA_MTU])
1243 dev->mtu = lowerdev->mtu;
1244 else if (dev->mtu > lowerdev->mtu)
1245 return -EINVAL;
1246
1247 if (!tb[IFLA_ADDRESS])
1248 eth_hw_addr_random(dev);
1249
1250 if (!macvlan_port_exists(lowerdev)) {
1251 err = macvlan_port_create(lowerdev);
1252 if (err < 0)
1253 return err;
1254 }
1255 port = macvlan_port_get_rtnl(lowerdev);
1256
1257 /* Only 1 macvlan device can be created in passthru mode */
1258 if (port->passthru)
1259 return -EINVAL;
1260
1261 vlan->lowerdev = lowerdev;
1262 vlan->dev = dev;
1263 vlan->port = port;
1264 vlan->set_features = MACVLAN_FEATURES;
1265 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1266
1267 vlan->mode = MACVLAN_MODE_VEPA;
1268 if (data && data[IFLA_MACVLAN_MODE])
1269 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1270
1271 if (data && data[IFLA_MACVLAN_FLAGS])
1272 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1273
1274 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1275 if (port->count)
1276 return -EINVAL;
1277 port->passthru = true;
1278 eth_hw_addr_inherit(dev, lowerdev);
1279 }
1280
1281 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1282 if (vlan->mode != MACVLAN_MODE_SOURCE)
1283 return -EINVAL;
1284 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1285 err = macvlan_changelink_sources(vlan, macmode, data);
1286 if (err)
1287 return err;
1288 }
1289
1290 port->count += 1;
1291 err = register_netdevice(dev);
1292 if (err < 0)
1293 goto destroy_port;
1294
1295 dev->priv_flags |= IFF_MACVLAN;
1296 err = netdev_upper_dev_link(lowerdev, dev);
1297 if (err)
1298 goto unregister_netdev;
1299
1300 list_add_tail_rcu(&vlan->list, &port->vlans);
1301 netif_stacked_transfer_operstate(lowerdev, dev);
1302
1303 return 0;
1304
1305 unregister_netdev:
1306 unregister_netdevice(dev);
1307 destroy_port:
1308 port->count -= 1;
1309 if (!port->count)
1310 macvlan_port_destroy(lowerdev);
1311
1312 return err;
1313 }
1314 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1315
1316 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1317 struct nlattr *tb[], struct nlattr *data[])
1318 {
1319 return macvlan_common_newlink(src_net, dev, tb, data);
1320 }
1321
1322 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1323 {
1324 struct macvlan_dev *vlan = netdev_priv(dev);
1325
1326 if (vlan->mode == MACVLAN_MODE_SOURCE)
1327 macvlan_flush_sources(vlan->port, vlan);
1328 list_del_rcu(&vlan->list);
1329 unregister_netdevice_queue(dev, head);
1330 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1331 }
1332 EXPORT_SYMBOL_GPL(macvlan_dellink);
1333
1334 static int macvlan_changelink(struct net_device *dev,
1335 struct nlattr *tb[], struct nlattr *data[])
1336 {
1337 struct macvlan_dev *vlan = netdev_priv(dev);
1338 enum macvlan_mode mode;
1339 bool set_mode = false;
1340 enum macvlan_macaddr_mode macmode;
1341 int ret;
1342
1343 /* Validate mode, but don't set yet: setting flags may fail. */
1344 if (data && data[IFLA_MACVLAN_MODE]) {
1345 set_mode = true;
1346 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1347 /* Passthrough mode can't be set or cleared dynamically */
1348 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1349 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1350 return -EINVAL;
1351 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1352 vlan->mode != mode)
1353 macvlan_flush_sources(vlan->port, vlan);
1354 }
1355
1356 if (data && data[IFLA_MACVLAN_FLAGS]) {
1357 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1358 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1359 if (vlan->port->passthru && promisc) {
1360 int err;
1361
1362 if (flags & MACVLAN_FLAG_NOPROMISC)
1363 err = dev_set_promiscuity(vlan->lowerdev, -1);
1364 else
1365 err = dev_set_promiscuity(vlan->lowerdev, 1);
1366 if (err < 0)
1367 return err;
1368 }
1369 vlan->flags = flags;
1370 }
1371 if (set_mode)
1372 vlan->mode = mode;
1373 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1374 if (vlan->mode != MACVLAN_MODE_SOURCE)
1375 return -EINVAL;
1376 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1377 ret = macvlan_changelink_sources(vlan, macmode, data);
1378 if (ret)
1379 return ret;
1380 }
1381 return 0;
1382 }
1383
1384 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1385 {
1386 if (vlan->macaddr_count == 0)
1387 return 0;
1388 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1389 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1390 }
1391
1392 static size_t macvlan_get_size(const struct net_device *dev)
1393 {
1394 struct macvlan_dev *vlan = netdev_priv(dev);
1395
1396 return (0
1397 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1398 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1399 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1400 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1401 );
1402 }
1403
1404 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1405 const struct macvlan_dev *vlan,
1406 const int i)
1407 {
1408 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1409 struct macvlan_source_entry *entry;
1410
1411 hlist_for_each_entry_rcu(entry, h, hlist) {
1412 if (entry->vlan != vlan)
1413 continue;
1414 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1415 return 1;
1416 }
1417 return 0;
1418 }
1419
1420 static int macvlan_fill_info(struct sk_buff *skb,
1421 const struct net_device *dev)
1422 {
1423 struct macvlan_dev *vlan = netdev_priv(dev);
1424 int i;
1425 struct nlattr *nest;
1426
1427 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1428 goto nla_put_failure;
1429 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1430 goto nla_put_failure;
1431 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1432 goto nla_put_failure;
1433 if (vlan->macaddr_count > 0) {
1434 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1435 if (nest == NULL)
1436 goto nla_put_failure;
1437
1438 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1439 if (macvlan_fill_info_macaddr(skb, vlan, i))
1440 goto nla_put_failure;
1441 }
1442 nla_nest_end(skb, nest);
1443 }
1444 return 0;
1445
1446 nla_put_failure:
1447 return -EMSGSIZE;
1448 }
1449
1450 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1451 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1452 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1453 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1454 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1455 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1456 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1457 };
1458
1459 int macvlan_link_register(struct rtnl_link_ops *ops)
1460 {
1461 /* common fields */
1462 ops->priv_size = sizeof(struct macvlan_dev);
1463 ops->validate = macvlan_validate;
1464 ops->maxtype = IFLA_MACVLAN_MAX;
1465 ops->policy = macvlan_policy;
1466 ops->changelink = macvlan_changelink;
1467 ops->get_size = macvlan_get_size;
1468 ops->fill_info = macvlan_fill_info;
1469
1470 return rtnl_link_register(ops);
1471 };
1472 EXPORT_SYMBOL_GPL(macvlan_link_register);
1473
1474 static struct rtnl_link_ops macvlan_link_ops = {
1475 .kind = "macvlan",
1476 .setup = macvlan_setup,
1477 .newlink = macvlan_newlink,
1478 .dellink = macvlan_dellink,
1479 };
1480
1481 static int macvlan_device_event(struct notifier_block *unused,
1482 unsigned long event, void *ptr)
1483 {
1484 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1485 struct macvlan_dev *vlan, *next;
1486 struct macvlan_port *port;
1487 LIST_HEAD(list_kill);
1488
1489 if (!macvlan_port_exists(dev))
1490 return NOTIFY_DONE;
1491
1492 port = macvlan_port_get_rtnl(dev);
1493
1494 switch (event) {
1495 case NETDEV_CHANGE:
1496 list_for_each_entry(vlan, &port->vlans, list)
1497 netif_stacked_transfer_operstate(vlan->lowerdev,
1498 vlan->dev);
1499 break;
1500 case NETDEV_FEAT_CHANGE:
1501 list_for_each_entry(vlan, &port->vlans, list) {
1502 vlan->dev->gso_max_size = dev->gso_max_size;
1503 netdev_update_features(vlan->dev);
1504 }
1505 break;
1506 case NETDEV_CHANGEMTU:
1507 list_for_each_entry(vlan, &port->vlans, list) {
1508 if (vlan->dev->mtu <= dev->mtu)
1509 continue;
1510 dev_set_mtu(vlan->dev, dev->mtu);
1511 }
1512 break;
1513 case NETDEV_CHANGEADDR:
1514 if (!port->passthru)
1515 return NOTIFY_DONE;
1516
1517 vlan = list_first_entry_or_null(&port->vlans,
1518 struct macvlan_dev,
1519 list);
1520
1521 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1522 return NOTIFY_BAD;
1523
1524 break;
1525 case NETDEV_UNREGISTER:
1526 /* twiddle thumbs on netns device moves */
1527 if (dev->reg_state != NETREG_UNREGISTERING)
1528 break;
1529
1530 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1531 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1532 unregister_netdevice_many(&list_kill);
1533 break;
1534 case NETDEV_PRE_TYPE_CHANGE:
1535 /* Forbid underlaying device to change its type. */
1536 return NOTIFY_BAD;
1537
1538 case NETDEV_NOTIFY_PEERS:
1539 case NETDEV_BONDING_FAILOVER:
1540 case NETDEV_RESEND_IGMP:
1541 /* Propagate to all vlans */
1542 list_for_each_entry(vlan, &port->vlans, list)
1543 call_netdevice_notifiers(event, vlan->dev);
1544 }
1545 return NOTIFY_DONE;
1546 }
1547
1548 static struct notifier_block macvlan_notifier_block __read_mostly = {
1549 .notifier_call = macvlan_device_event,
1550 };
1551
1552 static int __init macvlan_init_module(void)
1553 {
1554 int err;
1555
1556 register_netdevice_notifier(&macvlan_notifier_block);
1557
1558 err = macvlan_link_register(&macvlan_link_ops);
1559 if (err < 0)
1560 goto err1;
1561 return 0;
1562 err1:
1563 unregister_netdevice_notifier(&macvlan_notifier_block);
1564 return err;
1565 }
1566
1567 static void __exit macvlan_cleanup_module(void)
1568 {
1569 rtnl_link_unregister(&macvlan_link_ops);
1570 unregister_netdevice_notifier(&macvlan_notifier_block);
1571 }
1572
1573 module_init(macvlan_init_module);
1574 module_exit(macvlan_cleanup_module);
1575
1576 MODULE_LICENSE("GPL");
1577 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1578 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1579 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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