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Merge remote-tracking branches 'spi/topic/dw', 'spi/topic/flash-read', 'spi/topic...
[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(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
416 if (!skb)
417 return RX_HANDLER_CONSUMED;
418 *pskb = skb;
419 eth = eth_hdr(skb);
420 macvlan_forward_source(skb, port, eth->h_source);
421 src = macvlan_hash_lookup(port, eth->h_source);
422 if (src && src->mode != MACVLAN_MODE_VEPA &&
423 src->mode != MACVLAN_MODE_BRIDGE) {
424 /* forward to original port. */
425 vlan = src;
426 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
427 netif_rx(skb);
428 handle_res = RX_HANDLER_CONSUMED;
429 goto out;
430 }
431
432 MACVLAN_SKB_CB(skb)->src = src;
433 macvlan_broadcast_enqueue(port, skb);
434
435 return RX_HANDLER_PASS;
436 }
437
438 macvlan_forward_source(skb, port, eth->h_source);
439 if (port->passthru)
440 vlan = list_first_or_null_rcu(&port->vlans,
441 struct macvlan_dev, list);
442 else
443 vlan = macvlan_hash_lookup(port, eth->h_dest);
444 if (vlan == NULL)
445 return RX_HANDLER_PASS;
446
447 dev = vlan->dev;
448 if (unlikely(!(dev->flags & IFF_UP))) {
449 kfree_skb(skb);
450 return RX_HANDLER_CONSUMED;
451 }
452 len = skb->len + ETH_HLEN;
453 skb = skb_share_check(skb, GFP_ATOMIC);
454 if (!skb) {
455 ret = NET_RX_DROP;
456 handle_res = RX_HANDLER_CONSUMED;
457 goto out;
458 }
459
460 *pskb = skb;
461 skb->dev = dev;
462 skb->pkt_type = PACKET_HOST;
463
464 ret = NET_RX_SUCCESS;
465 handle_res = RX_HANDLER_ANOTHER;
466 out:
467 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
468 return handle_res;
469 }
470
471 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
472 {
473 const struct macvlan_dev *vlan = netdev_priv(dev);
474 const struct macvlan_port *port = vlan->port;
475 const struct macvlan_dev *dest;
476
477 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
478 const struct ethhdr *eth = (void *)skb->data;
479
480 /* send to other bridge ports directly */
481 if (is_multicast_ether_addr(eth->h_dest)) {
482 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
483 goto xmit_world;
484 }
485
486 dest = macvlan_hash_lookup(port, eth->h_dest);
487 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
488 /* send to lowerdev first for its network taps */
489 dev_forward_skb(vlan->lowerdev, skb);
490
491 return NET_XMIT_SUCCESS;
492 }
493 }
494
495 xmit_world:
496 skb->dev = vlan->lowerdev;
497 return dev_queue_xmit(skb);
498 }
499
500 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
501 {
502 #ifdef CONFIG_NET_POLL_CONTROLLER
503 if (vlan->netpoll)
504 netpoll_send_skb(vlan->netpoll, skb);
505 #else
506 BUG();
507 #endif
508 return NETDEV_TX_OK;
509 }
510
511 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
512 struct net_device *dev)
513 {
514 unsigned int len = skb->len;
515 int ret;
516 struct macvlan_dev *vlan = netdev_priv(dev);
517
518 if (unlikely(netpoll_tx_running(dev)))
519 return macvlan_netpoll_send_skb(vlan, skb);
520
521 if (vlan->fwd_priv) {
522 skb->dev = vlan->lowerdev;
523 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
524 } else {
525 ret = macvlan_queue_xmit(skb, dev);
526 }
527
528 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
529 struct vlan_pcpu_stats *pcpu_stats;
530
531 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
532 u64_stats_update_begin(&pcpu_stats->syncp);
533 pcpu_stats->tx_packets++;
534 pcpu_stats->tx_bytes += len;
535 u64_stats_update_end(&pcpu_stats->syncp);
536 } else {
537 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
538 }
539 return ret;
540 }
541
542 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
543 unsigned short type, const void *daddr,
544 const void *saddr, unsigned len)
545 {
546 const struct macvlan_dev *vlan = netdev_priv(dev);
547 struct net_device *lowerdev = vlan->lowerdev;
548
549 return dev_hard_header(skb, lowerdev, type, daddr,
550 saddr ? : dev->dev_addr, len);
551 }
552
553 static const struct header_ops macvlan_hard_header_ops = {
554 .create = macvlan_hard_header,
555 .parse = eth_header_parse,
556 .cache = eth_header_cache,
557 .cache_update = eth_header_cache_update,
558 };
559
560 static struct rtnl_link_ops macvlan_link_ops;
561
562 static int macvlan_open(struct net_device *dev)
563 {
564 struct macvlan_dev *vlan = netdev_priv(dev);
565 struct net_device *lowerdev = vlan->lowerdev;
566 int err;
567
568 if (vlan->port->passthru) {
569 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
570 err = dev_set_promiscuity(lowerdev, 1);
571 if (err < 0)
572 goto out;
573 }
574 goto hash_add;
575 }
576
577 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
578 dev->rtnl_link_ops == &macvlan_link_ops) {
579 vlan->fwd_priv =
580 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
581
582 /* If we get a NULL pointer back, or if we get an error
583 * then we should just fall through to the non accelerated path
584 */
585 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
586 vlan->fwd_priv = NULL;
587 } else
588 return 0;
589 }
590
591 err = -EBUSY;
592 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
593 goto out;
594
595 err = dev_uc_add(lowerdev, dev->dev_addr);
596 if (err < 0)
597 goto out;
598 if (dev->flags & IFF_ALLMULTI) {
599 err = dev_set_allmulti(lowerdev, 1);
600 if (err < 0)
601 goto del_unicast;
602 }
603
604 if (dev->flags & IFF_PROMISC) {
605 err = dev_set_promiscuity(lowerdev, 1);
606 if (err < 0)
607 goto clear_multi;
608 }
609
610 hash_add:
611 macvlan_hash_add(vlan);
612 return 0;
613
614 clear_multi:
615 dev_set_allmulti(lowerdev, -1);
616 del_unicast:
617 dev_uc_del(lowerdev, dev->dev_addr);
618 out:
619 if (vlan->fwd_priv) {
620 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
621 vlan->fwd_priv);
622 vlan->fwd_priv = NULL;
623 }
624 return err;
625 }
626
627 static int macvlan_stop(struct net_device *dev)
628 {
629 struct macvlan_dev *vlan = netdev_priv(dev);
630 struct net_device *lowerdev = vlan->lowerdev;
631
632 if (vlan->fwd_priv) {
633 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
634 vlan->fwd_priv);
635 vlan->fwd_priv = NULL;
636 return 0;
637 }
638
639 dev_uc_unsync(lowerdev, dev);
640 dev_mc_unsync(lowerdev, dev);
641
642 if (vlan->port->passthru) {
643 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
644 dev_set_promiscuity(lowerdev, -1);
645 goto hash_del;
646 }
647
648 if (dev->flags & IFF_ALLMULTI)
649 dev_set_allmulti(lowerdev, -1);
650
651 if (dev->flags & IFF_PROMISC)
652 dev_set_promiscuity(lowerdev, -1);
653
654 dev_uc_del(lowerdev, dev->dev_addr);
655
656 hash_del:
657 macvlan_hash_del(vlan, !dev->dismantle);
658 return 0;
659 }
660
661 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
662 {
663 struct macvlan_dev *vlan = netdev_priv(dev);
664 struct net_device *lowerdev = vlan->lowerdev;
665 int err;
666
667 if (!(dev->flags & IFF_UP)) {
668 /* Just copy in the new address */
669 ether_addr_copy(dev->dev_addr, addr);
670 } else {
671 /* Rehash and update the device filters */
672 if (macvlan_addr_busy(vlan->port, addr))
673 return -EBUSY;
674
675 if (!vlan->port->passthru) {
676 err = dev_uc_add(lowerdev, addr);
677 if (err)
678 return err;
679
680 dev_uc_del(lowerdev, dev->dev_addr);
681 }
682
683 macvlan_hash_change_addr(vlan, addr);
684 }
685 return 0;
686 }
687
688 static int macvlan_set_mac_address(struct net_device *dev, void *p)
689 {
690 struct macvlan_dev *vlan = netdev_priv(dev);
691 struct sockaddr *addr = p;
692
693 if (!is_valid_ether_addr(addr->sa_data))
694 return -EADDRNOTAVAIL;
695
696 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
697 dev_set_mac_address(vlan->lowerdev, addr);
698 return 0;
699 }
700
701 return macvlan_sync_address(dev, addr->sa_data);
702 }
703
704 static void macvlan_change_rx_flags(struct net_device *dev, int change)
705 {
706 struct macvlan_dev *vlan = netdev_priv(dev);
707 struct net_device *lowerdev = vlan->lowerdev;
708
709 if (dev->flags & IFF_UP) {
710 if (change & IFF_ALLMULTI)
711 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
712 if (change & IFF_PROMISC)
713 dev_set_promiscuity(lowerdev,
714 dev->flags & IFF_PROMISC ? 1 : -1);
715
716 }
717 }
718
719 static void macvlan_set_mac_lists(struct net_device *dev)
720 {
721 struct macvlan_dev *vlan = netdev_priv(dev);
722
723 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
724 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
725 } else {
726 struct netdev_hw_addr *ha;
727 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
728
729 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
730 netdev_for_each_mc_addr(ha, dev) {
731 __set_bit(mc_hash(vlan, ha->addr), filter);
732 }
733
734 __set_bit(mc_hash(vlan, dev->broadcast), filter);
735
736 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
737 }
738 dev_uc_sync(vlan->lowerdev, dev);
739 dev_mc_sync(vlan->lowerdev, dev);
740 }
741
742 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
743 {
744 struct macvlan_dev *vlan = netdev_priv(dev);
745
746 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
747 return -EINVAL;
748 dev->mtu = new_mtu;
749 return 0;
750 }
751
752 /*
753 * macvlan network devices have devices nesting below it and are a special
754 * "super class" of normal network devices; split their locks off into a
755 * separate class since they always nest.
756 */
757 static struct lock_class_key macvlan_netdev_xmit_lock_key;
758 static struct lock_class_key macvlan_netdev_addr_lock_key;
759
760 #define ALWAYS_ON_FEATURES \
761 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
762 NETIF_F_GSO_ROBUST)
763
764 #define MACVLAN_FEATURES \
765 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
766 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
767 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
768 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
769
770 #define MACVLAN_STATE_MASK \
771 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
772
773 static int macvlan_get_nest_level(struct net_device *dev)
774 {
775 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
776 }
777
778 static void macvlan_set_lockdep_class_one(struct net_device *dev,
779 struct netdev_queue *txq,
780 void *_unused)
781 {
782 lockdep_set_class(&txq->_xmit_lock,
783 &macvlan_netdev_xmit_lock_key);
784 }
785
786 static void macvlan_set_lockdep_class(struct net_device *dev)
787 {
788 lockdep_set_class_and_subclass(&dev->addr_list_lock,
789 &macvlan_netdev_addr_lock_key,
790 macvlan_get_nest_level(dev));
791 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
792 }
793
794 static int macvlan_init(struct net_device *dev)
795 {
796 struct macvlan_dev *vlan = netdev_priv(dev);
797 const struct net_device *lowerdev = vlan->lowerdev;
798
799 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
800 (lowerdev->state & MACVLAN_STATE_MASK);
801 dev->features = lowerdev->features & MACVLAN_FEATURES;
802 dev->features |= ALWAYS_ON_FEATURES;
803 dev->hw_features |= NETIF_F_LRO;
804 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
805 dev->gso_max_size = lowerdev->gso_max_size;
806 dev->gso_max_segs = lowerdev->gso_max_segs;
807 dev->hard_header_len = lowerdev->hard_header_len;
808
809 macvlan_set_lockdep_class(dev);
810
811 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
812 if (!vlan->pcpu_stats)
813 return -ENOMEM;
814
815 return 0;
816 }
817
818 static void macvlan_uninit(struct net_device *dev)
819 {
820 struct macvlan_dev *vlan = netdev_priv(dev);
821 struct macvlan_port *port = vlan->port;
822
823 free_percpu(vlan->pcpu_stats);
824
825 macvlan_flush_sources(port, vlan);
826 port->count -= 1;
827 if (!port->count)
828 macvlan_port_destroy(port->dev);
829 }
830
831 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
832 struct rtnl_link_stats64 *stats)
833 {
834 struct macvlan_dev *vlan = netdev_priv(dev);
835
836 if (vlan->pcpu_stats) {
837 struct vlan_pcpu_stats *p;
838 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
839 u32 rx_errors = 0, tx_dropped = 0;
840 unsigned int start;
841 int i;
842
843 for_each_possible_cpu(i) {
844 p = per_cpu_ptr(vlan->pcpu_stats, i);
845 do {
846 start = u64_stats_fetch_begin_irq(&p->syncp);
847 rx_packets = p->rx_packets;
848 rx_bytes = p->rx_bytes;
849 rx_multicast = p->rx_multicast;
850 tx_packets = p->tx_packets;
851 tx_bytes = p->tx_bytes;
852 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
853
854 stats->rx_packets += rx_packets;
855 stats->rx_bytes += rx_bytes;
856 stats->multicast += rx_multicast;
857 stats->tx_packets += tx_packets;
858 stats->tx_bytes += tx_bytes;
859 /* rx_errors & tx_dropped are u32, updated
860 * without syncp protection.
861 */
862 rx_errors += p->rx_errors;
863 tx_dropped += p->tx_dropped;
864 }
865 stats->rx_errors = rx_errors;
866 stats->rx_dropped = rx_errors;
867 stats->tx_dropped = tx_dropped;
868 }
869 return stats;
870 }
871
872 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
873 __be16 proto, u16 vid)
874 {
875 struct macvlan_dev *vlan = netdev_priv(dev);
876 struct net_device *lowerdev = vlan->lowerdev;
877
878 return vlan_vid_add(lowerdev, proto, vid);
879 }
880
881 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
882 __be16 proto, u16 vid)
883 {
884 struct macvlan_dev *vlan = netdev_priv(dev);
885 struct net_device *lowerdev = vlan->lowerdev;
886
887 vlan_vid_del(lowerdev, proto, vid);
888 return 0;
889 }
890
891 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
892 struct net_device *dev,
893 const unsigned char *addr, u16 vid,
894 u16 flags)
895 {
896 struct macvlan_dev *vlan = netdev_priv(dev);
897 int err = -EINVAL;
898
899 /* Support unicast filter only on passthru devices.
900 * Multicast filter should be allowed on all devices.
901 */
902 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
903 return -EOPNOTSUPP;
904
905 if (flags & NLM_F_REPLACE)
906 return -EOPNOTSUPP;
907
908 if (is_unicast_ether_addr(addr))
909 err = dev_uc_add_excl(dev, addr);
910 else if (is_multicast_ether_addr(addr))
911 err = dev_mc_add_excl(dev, addr);
912
913 return err;
914 }
915
916 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
917 struct net_device *dev,
918 const unsigned char *addr, u16 vid)
919 {
920 struct macvlan_dev *vlan = netdev_priv(dev);
921 int err = -EINVAL;
922
923 /* Support unicast filter only on passthru devices.
924 * Multicast filter should be allowed on all devices.
925 */
926 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
927 return -EOPNOTSUPP;
928
929 if (is_unicast_ether_addr(addr))
930 err = dev_uc_del(dev, addr);
931 else if (is_multicast_ether_addr(addr))
932 err = dev_mc_del(dev, addr);
933
934 return err;
935 }
936
937 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
938 struct ethtool_drvinfo *drvinfo)
939 {
940 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
941 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
942 }
943
944 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
945 struct ethtool_link_ksettings *cmd)
946 {
947 const struct macvlan_dev *vlan = netdev_priv(dev);
948
949 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
950 }
951
952 static netdev_features_t macvlan_fix_features(struct net_device *dev,
953 netdev_features_t features)
954 {
955 struct macvlan_dev *vlan = netdev_priv(dev);
956 netdev_features_t lowerdev_features = vlan->lowerdev->features;
957 netdev_features_t mask;
958
959 features |= NETIF_F_ALL_FOR_ALL;
960 features &= (vlan->set_features | ~MACVLAN_FEATURES);
961 mask = features;
962
963 lowerdev_features &= (features | ~NETIF_F_LRO);
964 features = netdev_increment_features(lowerdev_features, features, mask);
965 features |= ALWAYS_ON_FEATURES;
966 features &= ~NETIF_F_NETNS_LOCAL;
967
968 return features;
969 }
970
971 #ifdef CONFIG_NET_POLL_CONTROLLER
972 static void macvlan_dev_poll_controller(struct net_device *dev)
973 {
974 return;
975 }
976
977 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
978 {
979 struct macvlan_dev *vlan = netdev_priv(dev);
980 struct net_device *real_dev = vlan->lowerdev;
981 struct netpoll *netpoll;
982 int err = 0;
983
984 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
985 err = -ENOMEM;
986 if (!netpoll)
987 goto out;
988
989 err = __netpoll_setup(netpoll, real_dev);
990 if (err) {
991 kfree(netpoll);
992 goto out;
993 }
994
995 vlan->netpoll = netpoll;
996
997 out:
998 return err;
999 }
1000
1001 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1002 {
1003 struct macvlan_dev *vlan = netdev_priv(dev);
1004 struct netpoll *netpoll = vlan->netpoll;
1005
1006 if (!netpoll)
1007 return;
1008
1009 vlan->netpoll = NULL;
1010
1011 __netpoll_free_async(netpoll);
1012 }
1013 #endif /* CONFIG_NET_POLL_CONTROLLER */
1014
1015 static int macvlan_dev_get_iflink(const struct net_device *dev)
1016 {
1017 struct macvlan_dev *vlan = netdev_priv(dev);
1018
1019 return vlan->lowerdev->ifindex;
1020 }
1021
1022 static const struct ethtool_ops macvlan_ethtool_ops = {
1023 .get_link = ethtool_op_get_link,
1024 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1025 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1026 };
1027
1028 static const struct net_device_ops macvlan_netdev_ops = {
1029 .ndo_init = macvlan_init,
1030 .ndo_uninit = macvlan_uninit,
1031 .ndo_open = macvlan_open,
1032 .ndo_stop = macvlan_stop,
1033 .ndo_start_xmit = macvlan_start_xmit,
1034 .ndo_change_mtu = macvlan_change_mtu,
1035 .ndo_fix_features = macvlan_fix_features,
1036 .ndo_change_rx_flags = macvlan_change_rx_flags,
1037 .ndo_set_mac_address = macvlan_set_mac_address,
1038 .ndo_set_rx_mode = macvlan_set_mac_lists,
1039 .ndo_get_stats64 = macvlan_dev_get_stats64,
1040 .ndo_validate_addr = eth_validate_addr,
1041 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1042 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1043 .ndo_fdb_add = macvlan_fdb_add,
1044 .ndo_fdb_del = macvlan_fdb_del,
1045 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1046 .ndo_get_lock_subclass = macvlan_get_nest_level,
1047 #ifdef CONFIG_NET_POLL_CONTROLLER
1048 .ndo_poll_controller = macvlan_dev_poll_controller,
1049 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1050 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1051 #endif
1052 .ndo_get_iflink = macvlan_dev_get_iflink,
1053 .ndo_features_check = passthru_features_check,
1054 };
1055
1056 void macvlan_common_setup(struct net_device *dev)
1057 {
1058 ether_setup(dev);
1059
1060 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1061 netif_keep_dst(dev);
1062 dev->priv_flags |= IFF_UNICAST_FLT;
1063 dev->netdev_ops = &macvlan_netdev_ops;
1064 dev->destructor = free_netdev;
1065 dev->header_ops = &macvlan_hard_header_ops;
1066 dev->ethtool_ops = &macvlan_ethtool_ops;
1067 }
1068 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1069
1070 static void macvlan_setup(struct net_device *dev)
1071 {
1072 macvlan_common_setup(dev);
1073 dev->priv_flags |= IFF_NO_QUEUE;
1074 }
1075
1076 static int macvlan_port_create(struct net_device *dev)
1077 {
1078 struct macvlan_port *port;
1079 unsigned int i;
1080 int err;
1081
1082 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1083 return -EINVAL;
1084
1085 if (netif_is_ipvlan_port(dev))
1086 return -EBUSY;
1087
1088 port = kzalloc(sizeof(*port), GFP_KERNEL);
1089 if (port == NULL)
1090 return -ENOMEM;
1091
1092 port->passthru = false;
1093 port->dev = dev;
1094 INIT_LIST_HEAD(&port->vlans);
1095 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1096 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1097 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1098 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1099
1100 skb_queue_head_init(&port->bc_queue);
1101 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1102
1103 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1104 if (err)
1105 kfree(port);
1106 else
1107 dev->priv_flags |= IFF_MACVLAN_PORT;
1108 return err;
1109 }
1110
1111 static void macvlan_port_destroy(struct net_device *dev)
1112 {
1113 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1114
1115 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1116 netdev_rx_handler_unregister(dev);
1117
1118 /* After this point, no packet can schedule bc_work anymore,
1119 * but we need to cancel it and purge left skbs if any.
1120 */
1121 cancel_work_sync(&port->bc_work);
1122 __skb_queue_purge(&port->bc_queue);
1123
1124 kfree_rcu(port, rcu);
1125 }
1126
1127 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1128 {
1129 if (tb[IFLA_ADDRESS]) {
1130 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1131 return -EINVAL;
1132 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1133 return -EADDRNOTAVAIL;
1134 }
1135
1136 if (data && data[IFLA_MACVLAN_FLAGS] &&
1137 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1138 return -EINVAL;
1139
1140 if (data && data[IFLA_MACVLAN_MODE]) {
1141 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1142 case MACVLAN_MODE_PRIVATE:
1143 case MACVLAN_MODE_VEPA:
1144 case MACVLAN_MODE_BRIDGE:
1145 case MACVLAN_MODE_PASSTHRU:
1146 case MACVLAN_MODE_SOURCE:
1147 break;
1148 default:
1149 return -EINVAL;
1150 }
1151 }
1152
1153 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1154 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1155 case MACVLAN_MACADDR_ADD:
1156 case MACVLAN_MACADDR_DEL:
1157 case MACVLAN_MACADDR_FLUSH:
1158 case MACVLAN_MACADDR_SET:
1159 break;
1160 default:
1161 return -EINVAL;
1162 }
1163 }
1164
1165 if (data && data[IFLA_MACVLAN_MACADDR]) {
1166 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1167 return -EINVAL;
1168
1169 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1170 return -EADDRNOTAVAIL;
1171 }
1172
1173 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1174 return -EINVAL;
1175
1176 return 0;
1177 }
1178
1179 /**
1180 * reconfigure list of remote source mac address
1181 * (only for macvlan devices in source mode)
1182 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1183 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1184 */
1185 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1186 struct nlattr *data[])
1187 {
1188 char *addr = NULL;
1189 int ret, rem, len;
1190 struct nlattr *nla, *head;
1191 struct macvlan_source_entry *entry;
1192
1193 if (data[IFLA_MACVLAN_MACADDR])
1194 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1195
1196 if (mode == MACVLAN_MACADDR_ADD) {
1197 if (!addr)
1198 return -EINVAL;
1199
1200 return macvlan_hash_add_source(vlan, addr);
1201
1202 } else if (mode == MACVLAN_MACADDR_DEL) {
1203 if (!addr)
1204 return -EINVAL;
1205
1206 entry = macvlan_hash_lookup_source(vlan, addr);
1207 if (entry) {
1208 macvlan_hash_del_source(entry);
1209 vlan->macaddr_count--;
1210 }
1211 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1212 macvlan_flush_sources(vlan->port, vlan);
1213 } else if (mode == MACVLAN_MACADDR_SET) {
1214 macvlan_flush_sources(vlan->port, vlan);
1215
1216 if (addr) {
1217 ret = macvlan_hash_add_source(vlan, addr);
1218 if (ret)
1219 return ret;
1220 }
1221
1222 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1223 return 0;
1224
1225 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1226 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1227
1228 nla_for_each_attr(nla, head, len, rem) {
1229 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1230 nla_len(nla) != ETH_ALEN)
1231 continue;
1232
1233 addr = nla_data(nla);
1234 ret = macvlan_hash_add_source(vlan, addr);
1235 if (ret)
1236 return ret;
1237 }
1238 } else {
1239 return -EINVAL;
1240 }
1241
1242 return 0;
1243 }
1244
1245 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1246 struct nlattr *tb[], struct nlattr *data[])
1247 {
1248 struct macvlan_dev *vlan = netdev_priv(dev);
1249 struct macvlan_port *port;
1250 struct net_device *lowerdev;
1251 int err;
1252 int macmode;
1253
1254 if (!tb[IFLA_LINK])
1255 return -EINVAL;
1256
1257 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1258 if (lowerdev == NULL)
1259 return -ENODEV;
1260
1261 /* When creating macvlans or macvtaps on top of other macvlans - use
1262 * the real device as the lowerdev.
1263 */
1264 if (netif_is_macvlan(lowerdev))
1265 lowerdev = macvlan_dev_real_dev(lowerdev);
1266
1267 if (!tb[IFLA_MTU])
1268 dev->mtu = lowerdev->mtu;
1269 else if (dev->mtu > lowerdev->mtu)
1270 return -EINVAL;
1271
1272 if (!tb[IFLA_ADDRESS])
1273 eth_hw_addr_random(dev);
1274
1275 if (!macvlan_port_exists(lowerdev)) {
1276 err = macvlan_port_create(lowerdev);
1277 if (err < 0)
1278 return err;
1279 }
1280 port = macvlan_port_get_rtnl(lowerdev);
1281
1282 /* Only 1 macvlan device can be created in passthru mode */
1283 if (port->passthru)
1284 return -EINVAL;
1285
1286 vlan->lowerdev = lowerdev;
1287 vlan->dev = dev;
1288 vlan->port = port;
1289 vlan->set_features = MACVLAN_FEATURES;
1290 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1291
1292 vlan->mode = MACVLAN_MODE_VEPA;
1293 if (data && data[IFLA_MACVLAN_MODE])
1294 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1295
1296 if (data && data[IFLA_MACVLAN_FLAGS])
1297 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1298
1299 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1300 if (port->count)
1301 return -EINVAL;
1302 port->passthru = true;
1303 eth_hw_addr_inherit(dev, lowerdev);
1304 }
1305
1306 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1307 if (vlan->mode != MACVLAN_MODE_SOURCE)
1308 return -EINVAL;
1309 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1310 err = macvlan_changelink_sources(vlan, macmode, data);
1311 if (err)
1312 return err;
1313 }
1314
1315 port->count += 1;
1316 err = register_netdevice(dev);
1317 if (err < 0)
1318 goto destroy_port;
1319
1320 dev->priv_flags |= IFF_MACVLAN;
1321 err = netdev_upper_dev_link(lowerdev, dev);
1322 if (err)
1323 goto unregister_netdev;
1324
1325 list_add_tail_rcu(&vlan->list, &port->vlans);
1326 netif_stacked_transfer_operstate(lowerdev, dev);
1327 linkwatch_fire_event(dev);
1328
1329 return 0;
1330
1331 unregister_netdev:
1332 unregister_netdevice(dev);
1333 destroy_port:
1334 port->count -= 1;
1335 if (!port->count)
1336 macvlan_port_destroy(lowerdev);
1337
1338 return err;
1339 }
1340 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1341
1342 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1343 struct nlattr *tb[], struct nlattr *data[])
1344 {
1345 return macvlan_common_newlink(src_net, dev, tb, data);
1346 }
1347
1348 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1349 {
1350 struct macvlan_dev *vlan = netdev_priv(dev);
1351
1352 if (vlan->mode == MACVLAN_MODE_SOURCE)
1353 macvlan_flush_sources(vlan->port, vlan);
1354 list_del_rcu(&vlan->list);
1355 unregister_netdevice_queue(dev, head);
1356 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1357 }
1358 EXPORT_SYMBOL_GPL(macvlan_dellink);
1359
1360 static int macvlan_changelink(struct net_device *dev,
1361 struct nlattr *tb[], struct nlattr *data[])
1362 {
1363 struct macvlan_dev *vlan = netdev_priv(dev);
1364 enum macvlan_mode mode;
1365 bool set_mode = false;
1366 enum macvlan_macaddr_mode macmode;
1367 int ret;
1368
1369 /* Validate mode, but don't set yet: setting flags may fail. */
1370 if (data && data[IFLA_MACVLAN_MODE]) {
1371 set_mode = true;
1372 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1373 /* Passthrough mode can't be set or cleared dynamically */
1374 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1375 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1376 return -EINVAL;
1377 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1378 vlan->mode != mode)
1379 macvlan_flush_sources(vlan->port, vlan);
1380 }
1381
1382 if (data && data[IFLA_MACVLAN_FLAGS]) {
1383 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1384 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1385 if (vlan->port->passthru && promisc) {
1386 int err;
1387
1388 if (flags & MACVLAN_FLAG_NOPROMISC)
1389 err = dev_set_promiscuity(vlan->lowerdev, -1);
1390 else
1391 err = dev_set_promiscuity(vlan->lowerdev, 1);
1392 if (err < 0)
1393 return err;
1394 }
1395 vlan->flags = flags;
1396 }
1397 if (set_mode)
1398 vlan->mode = mode;
1399 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1400 if (vlan->mode != MACVLAN_MODE_SOURCE)
1401 return -EINVAL;
1402 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1403 ret = macvlan_changelink_sources(vlan, macmode, data);
1404 if (ret)
1405 return ret;
1406 }
1407 return 0;
1408 }
1409
1410 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1411 {
1412 if (vlan->macaddr_count == 0)
1413 return 0;
1414 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1415 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1416 }
1417
1418 static size_t macvlan_get_size(const struct net_device *dev)
1419 {
1420 struct macvlan_dev *vlan = netdev_priv(dev);
1421
1422 return (0
1423 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1424 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1425 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1426 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1427 );
1428 }
1429
1430 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1431 const struct macvlan_dev *vlan,
1432 const int i)
1433 {
1434 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1435 struct macvlan_source_entry *entry;
1436
1437 hlist_for_each_entry_rcu(entry, h, hlist) {
1438 if (entry->vlan != vlan)
1439 continue;
1440 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1441 return 1;
1442 }
1443 return 0;
1444 }
1445
1446 static int macvlan_fill_info(struct sk_buff *skb,
1447 const struct net_device *dev)
1448 {
1449 struct macvlan_dev *vlan = netdev_priv(dev);
1450 int i;
1451 struct nlattr *nest;
1452
1453 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1454 goto nla_put_failure;
1455 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1456 goto nla_put_failure;
1457 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1458 goto nla_put_failure;
1459 if (vlan->macaddr_count > 0) {
1460 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1461 if (nest == NULL)
1462 goto nla_put_failure;
1463
1464 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1465 if (macvlan_fill_info_macaddr(skb, vlan, i))
1466 goto nla_put_failure;
1467 }
1468 nla_nest_end(skb, nest);
1469 }
1470 return 0;
1471
1472 nla_put_failure:
1473 return -EMSGSIZE;
1474 }
1475
1476 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1477 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1478 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1479 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1480 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1481 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1482 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1483 };
1484
1485 int macvlan_link_register(struct rtnl_link_ops *ops)
1486 {
1487 /* common fields */
1488 ops->priv_size = sizeof(struct macvlan_dev);
1489 ops->validate = macvlan_validate;
1490 ops->maxtype = IFLA_MACVLAN_MAX;
1491 ops->policy = macvlan_policy;
1492 ops->changelink = macvlan_changelink;
1493 ops->get_size = macvlan_get_size;
1494 ops->fill_info = macvlan_fill_info;
1495
1496 return rtnl_link_register(ops);
1497 };
1498 EXPORT_SYMBOL_GPL(macvlan_link_register);
1499
1500 static struct net *macvlan_get_link_net(const struct net_device *dev)
1501 {
1502 return dev_net(macvlan_dev_real_dev(dev));
1503 }
1504
1505 static struct rtnl_link_ops macvlan_link_ops = {
1506 .kind = "macvlan",
1507 .setup = macvlan_setup,
1508 .newlink = macvlan_newlink,
1509 .dellink = macvlan_dellink,
1510 .get_link_net = macvlan_get_link_net,
1511 };
1512
1513 static int macvlan_device_event(struct notifier_block *unused,
1514 unsigned long event, void *ptr)
1515 {
1516 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1517 struct macvlan_dev *vlan, *next;
1518 struct macvlan_port *port;
1519 LIST_HEAD(list_kill);
1520
1521 if (!macvlan_port_exists(dev))
1522 return NOTIFY_DONE;
1523
1524 port = macvlan_port_get_rtnl(dev);
1525
1526 switch (event) {
1527 case NETDEV_UP:
1528 case NETDEV_CHANGE:
1529 list_for_each_entry(vlan, &port->vlans, list)
1530 netif_stacked_transfer_operstate(vlan->lowerdev,
1531 vlan->dev);
1532 break;
1533 case NETDEV_FEAT_CHANGE:
1534 list_for_each_entry(vlan, &port->vlans, list) {
1535 vlan->dev->gso_max_size = dev->gso_max_size;
1536 vlan->dev->gso_max_segs = dev->gso_max_segs;
1537 netdev_update_features(vlan->dev);
1538 }
1539 break;
1540 case NETDEV_CHANGEMTU:
1541 list_for_each_entry(vlan, &port->vlans, list) {
1542 if (vlan->dev->mtu <= dev->mtu)
1543 continue;
1544 dev_set_mtu(vlan->dev, dev->mtu);
1545 }
1546 break;
1547 case NETDEV_CHANGEADDR:
1548 if (!port->passthru)
1549 return NOTIFY_DONE;
1550
1551 vlan = list_first_entry_or_null(&port->vlans,
1552 struct macvlan_dev,
1553 list);
1554
1555 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1556 return NOTIFY_BAD;
1557
1558 break;
1559 case NETDEV_UNREGISTER:
1560 /* twiddle thumbs on netns device moves */
1561 if (dev->reg_state != NETREG_UNREGISTERING)
1562 break;
1563
1564 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1565 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1566 unregister_netdevice_many(&list_kill);
1567 break;
1568 case NETDEV_PRE_TYPE_CHANGE:
1569 /* Forbid underlaying device to change its type. */
1570 return NOTIFY_BAD;
1571
1572 case NETDEV_NOTIFY_PEERS:
1573 case NETDEV_BONDING_FAILOVER:
1574 case NETDEV_RESEND_IGMP:
1575 /* Propagate to all vlans */
1576 list_for_each_entry(vlan, &port->vlans, list)
1577 call_netdevice_notifiers(event, vlan->dev);
1578 }
1579 return NOTIFY_DONE;
1580 }
1581
1582 static struct notifier_block macvlan_notifier_block __read_mostly = {
1583 .notifier_call = macvlan_device_event,
1584 };
1585
1586 static int __init macvlan_init_module(void)
1587 {
1588 int err;
1589
1590 register_netdevice_notifier(&macvlan_notifier_block);
1591
1592 err = macvlan_link_register(&macvlan_link_ops);
1593 if (err < 0)
1594 goto err1;
1595 return 0;
1596 err1:
1597 unregister_netdevice_notifier(&macvlan_notifier_block);
1598 return err;
1599 }
1600
1601 static void __exit macvlan_cleanup_module(void)
1602 {
1603 rtnl_link_unregister(&macvlan_link_ops);
1604 unregister_netdevice_notifier(&macvlan_notifier_block);
1605 }
1606
1607 module_init(macvlan_init_module);
1608 module_exit(macvlan_cleanup_module);
1609
1610 MODULE_LICENSE("GPL");
1611 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1612 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1613 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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