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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[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
37 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
38
39 struct macvlan_port {
40 struct net_device *dev;
41 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
42 struct list_head vlans;
43 struct rcu_head rcu;
44 struct sk_buff_head bc_queue;
45 struct work_struct bc_work;
46 bool passthru;
47 int count;
48 };
49
50 struct macvlan_skb_cb {
51 const struct macvlan_dev *src;
52 };
53
54 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
55
56 static void macvlan_port_destroy(struct net_device *dev);
57
58 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
59 {
60 return rcu_dereference(dev->rx_handler_data);
61 }
62
63 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
64 {
65 return rtnl_dereference(dev->rx_handler_data);
66 }
67
68 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
69
70 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
71 const unsigned char *addr)
72 {
73 struct macvlan_dev *vlan;
74
75 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
76 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
77 return vlan;
78 }
79 return NULL;
80 }
81
82 static void macvlan_hash_add(struct macvlan_dev *vlan)
83 {
84 struct macvlan_port *port = vlan->port;
85 const unsigned char *addr = vlan->dev->dev_addr;
86
87 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
88 }
89
90 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
91 {
92 hlist_del_rcu(&vlan->hlist);
93 if (sync)
94 synchronize_rcu();
95 }
96
97 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
98 const unsigned char *addr)
99 {
100 macvlan_hash_del(vlan, true);
101 /* Now that we are unhashed it is safe to change the device
102 * address without confusing packet delivery.
103 */
104 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
105 macvlan_hash_add(vlan);
106 }
107
108 static int macvlan_addr_busy(const struct macvlan_port *port,
109 const unsigned char *addr)
110 {
111 /* Test to see if the specified multicast address is
112 * currently in use by the underlying device or
113 * another macvlan.
114 */
115 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
116 return 1;
117
118 if (macvlan_hash_lookup(port, addr))
119 return 1;
120
121 return 0;
122 }
123
124
125 static int macvlan_broadcast_one(struct sk_buff *skb,
126 const struct macvlan_dev *vlan,
127 const struct ethhdr *eth, bool local)
128 {
129 struct net_device *dev = vlan->dev;
130
131 if (local)
132 return __dev_forward_skb(dev, skb);
133
134 skb->dev = dev;
135 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
136 skb->pkt_type = PACKET_BROADCAST;
137 else
138 skb->pkt_type = PACKET_MULTICAST;
139
140 return 0;
141 }
142
143 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
144 {
145 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
146 }
147
148
149 static unsigned int mc_hash(const struct macvlan_dev *vlan,
150 const unsigned char *addr)
151 {
152 u32 val = __get_unaligned_cpu32(addr + 2);
153
154 val ^= macvlan_hash_mix(vlan);
155 return hash_32(val, MACVLAN_MC_FILTER_BITS);
156 }
157
158 static void macvlan_broadcast(struct sk_buff *skb,
159 const struct macvlan_port *port,
160 struct net_device *src,
161 enum macvlan_mode mode)
162 {
163 const struct ethhdr *eth = eth_hdr(skb);
164 const struct macvlan_dev *vlan;
165 struct sk_buff *nskb;
166 unsigned int i;
167 int err;
168 unsigned int hash;
169
170 if (skb->protocol == htons(ETH_P_PAUSE))
171 return;
172
173 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
174 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
175 if (vlan->dev == src || !(vlan->mode & mode))
176 continue;
177
178 hash = mc_hash(vlan, eth->h_dest);
179 if (!test_bit(hash, vlan->mc_filter))
180 continue;
181
182 err = NET_RX_DROP;
183 nskb = skb_clone(skb, GFP_ATOMIC);
184 if (likely(nskb))
185 err = macvlan_broadcast_one(
186 nskb, vlan, eth,
187 mode == MACVLAN_MODE_BRIDGE) ?:
188 netif_rx_ni(nskb);
189 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
190 err == NET_RX_SUCCESS, 1);
191 }
192 }
193 }
194
195 static void macvlan_process_broadcast(struct work_struct *w)
196 {
197 struct macvlan_port *port = container_of(w, struct macvlan_port,
198 bc_work);
199 struct sk_buff *skb;
200 struct sk_buff_head list;
201
202 skb_queue_head_init(&list);
203
204 spin_lock_bh(&port->bc_queue.lock);
205 skb_queue_splice_tail_init(&port->bc_queue, &list);
206 spin_unlock_bh(&port->bc_queue.lock);
207
208 while ((skb = __skb_dequeue(&list))) {
209 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
210
211 rcu_read_lock();
212
213 if (!src)
214 /* frame comes from an external address */
215 macvlan_broadcast(skb, port, NULL,
216 MACVLAN_MODE_PRIVATE |
217 MACVLAN_MODE_VEPA |
218 MACVLAN_MODE_PASSTHRU|
219 MACVLAN_MODE_BRIDGE);
220 else if (src->mode == MACVLAN_MODE_VEPA)
221 /* flood to everyone except source */
222 macvlan_broadcast(skb, port, src->dev,
223 MACVLAN_MODE_VEPA |
224 MACVLAN_MODE_BRIDGE);
225 else
226 /*
227 * flood only to VEPA ports, bridge ports
228 * already saw the frame on the way out.
229 */
230 macvlan_broadcast(skb, port, src->dev,
231 MACVLAN_MODE_VEPA);
232
233 rcu_read_unlock();
234
235 kfree_skb(skb);
236 }
237 }
238
239 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
240 struct sk_buff *skb)
241 {
242 struct sk_buff *nskb;
243 int err = -ENOMEM;
244
245 nskb = skb_clone(skb, GFP_ATOMIC);
246 if (!nskb)
247 goto err;
248
249 spin_lock(&port->bc_queue.lock);
250 if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) {
251 __skb_queue_tail(&port->bc_queue, nskb);
252 err = 0;
253 }
254 spin_unlock(&port->bc_queue.lock);
255
256 if (err)
257 goto free_nskb;
258
259 schedule_work(&port->bc_work);
260 return;
261
262 free_nskb:
263 kfree_skb(nskb);
264 err:
265 atomic_long_inc(&skb->dev->rx_dropped);
266 }
267
268 /* called under rcu_read_lock() from netif_receive_skb */
269 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
270 {
271 struct macvlan_port *port;
272 struct sk_buff *skb = *pskb;
273 const struct ethhdr *eth = eth_hdr(skb);
274 const struct macvlan_dev *vlan;
275 const struct macvlan_dev *src;
276 struct net_device *dev;
277 unsigned int len = 0;
278 int ret = NET_RX_DROP;
279
280 port = macvlan_port_get_rcu(skb->dev);
281 if (is_multicast_ether_addr(eth->h_dest)) {
282 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
283 if (!skb)
284 return RX_HANDLER_CONSUMED;
285 eth = eth_hdr(skb);
286 src = macvlan_hash_lookup(port, eth->h_source);
287 if (src && src->mode != MACVLAN_MODE_VEPA &&
288 src->mode != MACVLAN_MODE_BRIDGE) {
289 /* forward to original port. */
290 vlan = src;
291 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
292 netif_rx(skb);
293 goto out;
294 }
295
296 MACVLAN_SKB_CB(skb)->src = src;
297 macvlan_broadcast_enqueue(port, skb);
298
299 return RX_HANDLER_PASS;
300 }
301
302 if (port->passthru)
303 vlan = list_first_or_null_rcu(&port->vlans,
304 struct macvlan_dev, list);
305 else
306 vlan = macvlan_hash_lookup(port, eth->h_dest);
307 if (vlan == NULL)
308 return RX_HANDLER_PASS;
309
310 dev = vlan->dev;
311 if (unlikely(!(dev->flags & IFF_UP))) {
312 kfree_skb(skb);
313 return RX_HANDLER_CONSUMED;
314 }
315 len = skb->len + ETH_HLEN;
316 skb = skb_share_check(skb, GFP_ATOMIC);
317 if (!skb)
318 goto out;
319
320 skb->dev = dev;
321 skb->pkt_type = PACKET_HOST;
322
323 ret = netif_rx(skb);
324
325 out:
326 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
327 return RX_HANDLER_CONSUMED;
328 }
329
330 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
331 {
332 const struct macvlan_dev *vlan = netdev_priv(dev);
333 const struct macvlan_port *port = vlan->port;
334 const struct macvlan_dev *dest;
335 __u8 ip_summed = skb->ip_summed;
336
337 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
338 const struct ethhdr *eth = (void *)skb->data;
339 skb->ip_summed = CHECKSUM_UNNECESSARY;
340
341 /* send to other bridge ports directly */
342 if (is_multicast_ether_addr(eth->h_dest)) {
343 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
344 goto xmit_world;
345 }
346
347 dest = macvlan_hash_lookup(port, eth->h_dest);
348 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
349 /* send to lowerdev first for its network taps */
350 dev_forward_skb(vlan->lowerdev, skb);
351
352 return NET_XMIT_SUCCESS;
353 }
354 }
355
356 xmit_world:
357 skb->ip_summed = ip_summed;
358 skb->dev = vlan->lowerdev;
359 return dev_queue_xmit(skb);
360 }
361
362 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
363 struct net_device *dev)
364 {
365 unsigned int len = skb->len;
366 int ret;
367 const struct macvlan_dev *vlan = netdev_priv(dev);
368
369 if (vlan->fwd_priv) {
370 skb->dev = vlan->lowerdev;
371 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
372 } else {
373 ret = macvlan_queue_xmit(skb, dev);
374 }
375
376 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
377 struct vlan_pcpu_stats *pcpu_stats;
378
379 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
380 u64_stats_update_begin(&pcpu_stats->syncp);
381 pcpu_stats->tx_packets++;
382 pcpu_stats->tx_bytes += len;
383 u64_stats_update_end(&pcpu_stats->syncp);
384 } else {
385 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
386 }
387 return ret;
388 }
389
390 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
391 unsigned short type, const void *daddr,
392 const void *saddr, unsigned len)
393 {
394 const struct macvlan_dev *vlan = netdev_priv(dev);
395 struct net_device *lowerdev = vlan->lowerdev;
396
397 return dev_hard_header(skb, lowerdev, type, daddr,
398 saddr ? : dev->dev_addr, len);
399 }
400
401 static const struct header_ops macvlan_hard_header_ops = {
402 .create = macvlan_hard_header,
403 .rebuild = eth_rebuild_header,
404 .parse = eth_header_parse,
405 .cache = eth_header_cache,
406 .cache_update = eth_header_cache_update,
407 };
408
409 static struct rtnl_link_ops macvlan_link_ops;
410
411 static int macvlan_open(struct net_device *dev)
412 {
413 struct macvlan_dev *vlan = netdev_priv(dev);
414 struct net_device *lowerdev = vlan->lowerdev;
415 int err;
416
417 if (vlan->port->passthru) {
418 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
419 err = dev_set_promiscuity(lowerdev, 1);
420 if (err < 0)
421 goto out;
422 }
423 goto hash_add;
424 }
425
426 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
427 dev->rtnl_link_ops == &macvlan_link_ops) {
428 vlan->fwd_priv =
429 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
430
431 /* If we get a NULL pointer back, or if we get an error
432 * then we should just fall through to the non accelerated path
433 */
434 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
435 vlan->fwd_priv = NULL;
436 } else
437 return 0;
438 }
439
440 err = -EBUSY;
441 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
442 goto out;
443
444 err = dev_uc_add(lowerdev, dev->dev_addr);
445 if (err < 0)
446 goto out;
447 if (dev->flags & IFF_ALLMULTI) {
448 err = dev_set_allmulti(lowerdev, 1);
449 if (err < 0)
450 goto del_unicast;
451 }
452
453 hash_add:
454 macvlan_hash_add(vlan);
455 return 0;
456
457 del_unicast:
458 dev_uc_del(lowerdev, dev->dev_addr);
459 out:
460 if (vlan->fwd_priv) {
461 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
462 vlan->fwd_priv);
463 vlan->fwd_priv = NULL;
464 }
465 return err;
466 }
467
468 static int macvlan_stop(struct net_device *dev)
469 {
470 struct macvlan_dev *vlan = netdev_priv(dev);
471 struct net_device *lowerdev = vlan->lowerdev;
472
473 if (vlan->fwd_priv) {
474 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
475 vlan->fwd_priv);
476 vlan->fwd_priv = NULL;
477 return 0;
478 }
479
480 dev_uc_unsync(lowerdev, dev);
481 dev_mc_unsync(lowerdev, dev);
482
483 if (vlan->port->passthru) {
484 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
485 dev_set_promiscuity(lowerdev, -1);
486 goto hash_del;
487 }
488
489 if (dev->flags & IFF_ALLMULTI)
490 dev_set_allmulti(lowerdev, -1);
491
492 dev_uc_del(lowerdev, dev->dev_addr);
493
494 hash_del:
495 macvlan_hash_del(vlan, !dev->dismantle);
496 return 0;
497 }
498
499 static int macvlan_set_mac_address(struct net_device *dev, void *p)
500 {
501 struct macvlan_dev *vlan = netdev_priv(dev);
502 struct net_device *lowerdev = vlan->lowerdev;
503 struct sockaddr *addr = p;
504 int err;
505
506 if (!is_valid_ether_addr(addr->sa_data))
507 return -EADDRNOTAVAIL;
508
509 if (!(dev->flags & IFF_UP)) {
510 /* Just copy in the new address */
511 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
512 } else {
513 /* Rehash and update the device filters */
514 if (macvlan_addr_busy(vlan->port, addr->sa_data))
515 return -EBUSY;
516
517 err = dev_uc_add(lowerdev, addr->sa_data);
518 if (err)
519 return err;
520
521 dev_uc_del(lowerdev, dev->dev_addr);
522
523 macvlan_hash_change_addr(vlan, addr->sa_data);
524 }
525 return 0;
526 }
527
528 static void macvlan_change_rx_flags(struct net_device *dev, int change)
529 {
530 struct macvlan_dev *vlan = netdev_priv(dev);
531 struct net_device *lowerdev = vlan->lowerdev;
532
533 if (change & IFF_ALLMULTI)
534 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
535 }
536
537 static void macvlan_set_mac_lists(struct net_device *dev)
538 {
539 struct macvlan_dev *vlan = netdev_priv(dev);
540
541 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
542 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
543 } else {
544 struct netdev_hw_addr *ha;
545 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
546
547 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
548 netdev_for_each_mc_addr(ha, dev) {
549 __set_bit(mc_hash(vlan, ha->addr), filter);
550 }
551
552 __set_bit(mc_hash(vlan, dev->broadcast), filter);
553
554 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
555 }
556 dev_uc_sync(vlan->lowerdev, dev);
557 dev_mc_sync(vlan->lowerdev, dev);
558 }
559
560 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
561 {
562 struct macvlan_dev *vlan = netdev_priv(dev);
563
564 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
565 return -EINVAL;
566 dev->mtu = new_mtu;
567 return 0;
568 }
569
570 /*
571 * macvlan network devices have devices nesting below it and are a special
572 * "super class" of normal network devices; split their locks off into a
573 * separate class since they always nest.
574 */
575 static struct lock_class_key macvlan_netdev_xmit_lock_key;
576 static struct lock_class_key macvlan_netdev_addr_lock_key;
577
578 #define ALWAYS_ON_FEATURES \
579 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
580
581 #define MACVLAN_FEATURES \
582 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
583 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
584 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
585 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
586
587 #define MACVLAN_STATE_MASK \
588 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
589
590 static void macvlan_set_lockdep_class_one(struct net_device *dev,
591 struct netdev_queue *txq,
592 void *_unused)
593 {
594 lockdep_set_class(&txq->_xmit_lock,
595 &macvlan_netdev_xmit_lock_key);
596 }
597
598 static void macvlan_set_lockdep_class(struct net_device *dev)
599 {
600 lockdep_set_class(&dev->addr_list_lock,
601 &macvlan_netdev_addr_lock_key);
602 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
603 }
604
605 static int macvlan_init(struct net_device *dev)
606 {
607 struct macvlan_dev *vlan = netdev_priv(dev);
608 const struct net_device *lowerdev = vlan->lowerdev;
609
610 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
611 (lowerdev->state & MACVLAN_STATE_MASK);
612 dev->features = lowerdev->features & MACVLAN_FEATURES;
613 dev->features |= ALWAYS_ON_FEATURES;
614 dev->gso_max_size = lowerdev->gso_max_size;
615 dev->iflink = lowerdev->ifindex;
616 dev->hard_header_len = lowerdev->hard_header_len;
617
618 macvlan_set_lockdep_class(dev);
619
620 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
621 if (!vlan->pcpu_stats)
622 return -ENOMEM;
623
624 return 0;
625 }
626
627 static void macvlan_uninit(struct net_device *dev)
628 {
629 struct macvlan_dev *vlan = netdev_priv(dev);
630 struct macvlan_port *port = vlan->port;
631
632 free_percpu(vlan->pcpu_stats);
633
634 port->count -= 1;
635 if (!port->count)
636 macvlan_port_destroy(port->dev);
637 }
638
639 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
640 struct rtnl_link_stats64 *stats)
641 {
642 struct macvlan_dev *vlan = netdev_priv(dev);
643
644 if (vlan->pcpu_stats) {
645 struct vlan_pcpu_stats *p;
646 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
647 u32 rx_errors = 0, tx_dropped = 0;
648 unsigned int start;
649 int i;
650
651 for_each_possible_cpu(i) {
652 p = per_cpu_ptr(vlan->pcpu_stats, i);
653 do {
654 start = u64_stats_fetch_begin_irq(&p->syncp);
655 rx_packets = p->rx_packets;
656 rx_bytes = p->rx_bytes;
657 rx_multicast = p->rx_multicast;
658 tx_packets = p->tx_packets;
659 tx_bytes = p->tx_bytes;
660 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
661
662 stats->rx_packets += rx_packets;
663 stats->rx_bytes += rx_bytes;
664 stats->multicast += rx_multicast;
665 stats->tx_packets += tx_packets;
666 stats->tx_bytes += tx_bytes;
667 /* rx_errors & tx_dropped are u32, updated
668 * without syncp protection.
669 */
670 rx_errors += p->rx_errors;
671 tx_dropped += p->tx_dropped;
672 }
673 stats->rx_errors = rx_errors;
674 stats->rx_dropped = rx_errors;
675 stats->tx_dropped = tx_dropped;
676 }
677 return stats;
678 }
679
680 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
681 __be16 proto, u16 vid)
682 {
683 struct macvlan_dev *vlan = netdev_priv(dev);
684 struct net_device *lowerdev = vlan->lowerdev;
685
686 return vlan_vid_add(lowerdev, proto, vid);
687 }
688
689 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
690 __be16 proto, u16 vid)
691 {
692 struct macvlan_dev *vlan = netdev_priv(dev);
693 struct net_device *lowerdev = vlan->lowerdev;
694
695 vlan_vid_del(lowerdev, proto, vid);
696 return 0;
697 }
698
699 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
700 struct net_device *dev,
701 const unsigned char *addr,
702 u16 flags)
703 {
704 struct macvlan_dev *vlan = netdev_priv(dev);
705 int err = -EINVAL;
706
707 if (!vlan->port->passthru)
708 return -EOPNOTSUPP;
709
710 if (flags & NLM_F_REPLACE)
711 return -EOPNOTSUPP;
712
713 if (is_unicast_ether_addr(addr))
714 err = dev_uc_add_excl(dev, addr);
715 else if (is_multicast_ether_addr(addr))
716 err = dev_mc_add_excl(dev, addr);
717
718 return err;
719 }
720
721 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
722 struct net_device *dev,
723 const unsigned char *addr)
724 {
725 struct macvlan_dev *vlan = netdev_priv(dev);
726 int err = -EINVAL;
727
728 if (!vlan->port->passthru)
729 return -EOPNOTSUPP;
730
731 if (is_unicast_ether_addr(addr))
732 err = dev_uc_del(dev, addr);
733 else if (is_multicast_ether_addr(addr))
734 err = dev_mc_del(dev, addr);
735
736 return err;
737 }
738
739 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
740 struct ethtool_drvinfo *drvinfo)
741 {
742 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
743 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
744 }
745
746 static int macvlan_ethtool_get_settings(struct net_device *dev,
747 struct ethtool_cmd *cmd)
748 {
749 const struct macvlan_dev *vlan = netdev_priv(dev);
750
751 return __ethtool_get_settings(vlan->lowerdev, cmd);
752 }
753
754 static netdev_features_t macvlan_fix_features(struct net_device *dev,
755 netdev_features_t features)
756 {
757 struct macvlan_dev *vlan = netdev_priv(dev);
758 netdev_features_t mask;
759
760 features |= NETIF_F_ALL_FOR_ALL;
761 features &= (vlan->set_features | ~MACVLAN_FEATURES);
762 mask = features;
763
764 features = netdev_increment_features(vlan->lowerdev->features,
765 features,
766 mask);
767 features |= ALWAYS_ON_FEATURES;
768
769 return features;
770 }
771
772 static const struct ethtool_ops macvlan_ethtool_ops = {
773 .get_link = ethtool_op_get_link,
774 .get_settings = macvlan_ethtool_get_settings,
775 .get_drvinfo = macvlan_ethtool_get_drvinfo,
776 };
777
778 static const struct net_device_ops macvlan_netdev_ops = {
779 .ndo_init = macvlan_init,
780 .ndo_uninit = macvlan_uninit,
781 .ndo_open = macvlan_open,
782 .ndo_stop = macvlan_stop,
783 .ndo_start_xmit = macvlan_start_xmit,
784 .ndo_change_mtu = macvlan_change_mtu,
785 .ndo_fix_features = macvlan_fix_features,
786 .ndo_change_rx_flags = macvlan_change_rx_flags,
787 .ndo_set_mac_address = macvlan_set_mac_address,
788 .ndo_set_rx_mode = macvlan_set_mac_lists,
789 .ndo_get_stats64 = macvlan_dev_get_stats64,
790 .ndo_validate_addr = eth_validate_addr,
791 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
792 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
793 .ndo_fdb_add = macvlan_fdb_add,
794 .ndo_fdb_del = macvlan_fdb_del,
795 .ndo_fdb_dump = ndo_dflt_fdb_dump,
796 };
797
798 void macvlan_common_setup(struct net_device *dev)
799 {
800 ether_setup(dev);
801
802 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
803 dev->priv_flags |= IFF_UNICAST_FLT;
804 dev->netdev_ops = &macvlan_netdev_ops;
805 dev->destructor = free_netdev;
806 dev->header_ops = &macvlan_hard_header_ops;
807 dev->ethtool_ops = &macvlan_ethtool_ops;
808 }
809 EXPORT_SYMBOL_GPL(macvlan_common_setup);
810
811 static void macvlan_setup(struct net_device *dev)
812 {
813 macvlan_common_setup(dev);
814 dev->tx_queue_len = 0;
815 }
816
817 static int macvlan_port_create(struct net_device *dev)
818 {
819 struct macvlan_port *port;
820 unsigned int i;
821 int err;
822
823 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
824 return -EINVAL;
825
826 port = kzalloc(sizeof(*port), GFP_KERNEL);
827 if (port == NULL)
828 return -ENOMEM;
829
830 port->passthru = false;
831 port->dev = dev;
832 INIT_LIST_HEAD(&port->vlans);
833 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
834 INIT_HLIST_HEAD(&port->vlan_hash[i]);
835
836 skb_queue_head_init(&port->bc_queue);
837 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
838
839 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
840 if (err)
841 kfree(port);
842 else
843 dev->priv_flags |= IFF_MACVLAN_PORT;
844 return err;
845 }
846
847 static void macvlan_port_destroy(struct net_device *dev)
848 {
849 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
850
851 cancel_work_sync(&port->bc_work);
852 dev->priv_flags &= ~IFF_MACVLAN_PORT;
853 netdev_rx_handler_unregister(dev);
854 kfree_rcu(port, rcu);
855 }
856
857 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
858 {
859 if (tb[IFLA_ADDRESS]) {
860 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
861 return -EINVAL;
862 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
863 return -EADDRNOTAVAIL;
864 }
865
866 if (data && data[IFLA_MACVLAN_FLAGS] &&
867 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
868 return -EINVAL;
869
870 if (data && data[IFLA_MACVLAN_MODE]) {
871 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
872 case MACVLAN_MODE_PRIVATE:
873 case MACVLAN_MODE_VEPA:
874 case MACVLAN_MODE_BRIDGE:
875 case MACVLAN_MODE_PASSTHRU:
876 break;
877 default:
878 return -EINVAL;
879 }
880 }
881 return 0;
882 }
883
884 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
885 struct nlattr *tb[], struct nlattr *data[])
886 {
887 struct macvlan_dev *vlan = netdev_priv(dev);
888 struct macvlan_port *port;
889 struct net_device *lowerdev;
890 int err;
891
892 if (!tb[IFLA_LINK])
893 return -EINVAL;
894
895 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
896 if (lowerdev == NULL)
897 return -ENODEV;
898
899 /* When creating macvlans or macvtaps on top of other macvlans - use
900 * the real device as the lowerdev.
901 */
902 if (netif_is_macvlan(lowerdev))
903 lowerdev = macvlan_dev_real_dev(lowerdev);
904
905 if (!tb[IFLA_MTU])
906 dev->mtu = lowerdev->mtu;
907 else if (dev->mtu > lowerdev->mtu)
908 return -EINVAL;
909
910 if (!tb[IFLA_ADDRESS])
911 eth_hw_addr_random(dev);
912
913 if (!macvlan_port_exists(lowerdev)) {
914 err = macvlan_port_create(lowerdev);
915 if (err < 0)
916 return err;
917 }
918 port = macvlan_port_get_rtnl(lowerdev);
919
920 /* Only 1 macvlan device can be created in passthru mode */
921 if (port->passthru)
922 return -EINVAL;
923
924 vlan->lowerdev = lowerdev;
925 vlan->dev = dev;
926 vlan->port = port;
927 vlan->set_features = MACVLAN_FEATURES;
928
929 vlan->mode = MACVLAN_MODE_VEPA;
930 if (data && data[IFLA_MACVLAN_MODE])
931 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
932
933 if (data && data[IFLA_MACVLAN_FLAGS])
934 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
935
936 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
937 if (port->count)
938 return -EINVAL;
939 port->passthru = true;
940 eth_hw_addr_inherit(dev, lowerdev);
941 }
942
943 port->count += 1;
944 err = register_netdevice(dev);
945 if (err < 0)
946 goto destroy_port;
947
948 dev->priv_flags |= IFF_MACVLAN;
949 err = netdev_upper_dev_link(lowerdev, dev);
950 if (err)
951 goto unregister_netdev;
952
953 list_add_tail_rcu(&vlan->list, &port->vlans);
954 netif_stacked_transfer_operstate(lowerdev, dev);
955
956 return 0;
957
958 unregister_netdev:
959 unregister_netdevice(dev);
960 destroy_port:
961 port->count -= 1;
962 if (!port->count)
963 macvlan_port_destroy(lowerdev);
964
965 return err;
966 }
967 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
968
969 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
970 struct nlattr *tb[], struct nlattr *data[])
971 {
972 return macvlan_common_newlink(src_net, dev, tb, data);
973 }
974
975 void macvlan_dellink(struct net_device *dev, struct list_head *head)
976 {
977 struct macvlan_dev *vlan = netdev_priv(dev);
978
979 list_del_rcu(&vlan->list);
980 unregister_netdevice_queue(dev, head);
981 netdev_upper_dev_unlink(vlan->lowerdev, dev);
982 }
983 EXPORT_SYMBOL_GPL(macvlan_dellink);
984
985 static int macvlan_changelink(struct net_device *dev,
986 struct nlattr *tb[], struct nlattr *data[])
987 {
988 struct macvlan_dev *vlan = netdev_priv(dev);
989 enum macvlan_mode mode;
990 bool set_mode = false;
991
992 /* Validate mode, but don't set yet: setting flags may fail. */
993 if (data && data[IFLA_MACVLAN_MODE]) {
994 set_mode = true;
995 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
996 /* Passthrough mode can't be set or cleared dynamically */
997 if ((mode == MACVLAN_MODE_PASSTHRU) !=
998 (vlan->mode == MACVLAN_MODE_PASSTHRU))
999 return -EINVAL;
1000 }
1001
1002 if (data && data[IFLA_MACVLAN_FLAGS]) {
1003 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1004 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1005 if (vlan->port->passthru && promisc) {
1006 int err;
1007
1008 if (flags & MACVLAN_FLAG_NOPROMISC)
1009 err = dev_set_promiscuity(vlan->lowerdev, -1);
1010 else
1011 err = dev_set_promiscuity(vlan->lowerdev, 1);
1012 if (err < 0)
1013 return err;
1014 }
1015 vlan->flags = flags;
1016 }
1017 if (set_mode)
1018 vlan->mode = mode;
1019 return 0;
1020 }
1021
1022 static size_t macvlan_get_size(const struct net_device *dev)
1023 {
1024 return (0
1025 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1026 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1027 );
1028 }
1029
1030 static int macvlan_fill_info(struct sk_buff *skb,
1031 const struct net_device *dev)
1032 {
1033 struct macvlan_dev *vlan = netdev_priv(dev);
1034
1035 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1036 goto nla_put_failure;
1037 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1038 goto nla_put_failure;
1039 return 0;
1040
1041 nla_put_failure:
1042 return -EMSGSIZE;
1043 }
1044
1045 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1046 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1047 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1048 };
1049
1050 int macvlan_link_register(struct rtnl_link_ops *ops)
1051 {
1052 /* common fields */
1053 ops->priv_size = sizeof(struct macvlan_dev);
1054 ops->validate = macvlan_validate;
1055 ops->maxtype = IFLA_MACVLAN_MAX;
1056 ops->policy = macvlan_policy;
1057 ops->changelink = macvlan_changelink;
1058 ops->get_size = macvlan_get_size;
1059 ops->fill_info = macvlan_fill_info;
1060
1061 return rtnl_link_register(ops);
1062 };
1063 EXPORT_SYMBOL_GPL(macvlan_link_register);
1064
1065 static struct rtnl_link_ops macvlan_link_ops = {
1066 .kind = "macvlan",
1067 .setup = macvlan_setup,
1068 .newlink = macvlan_newlink,
1069 .dellink = macvlan_dellink,
1070 };
1071
1072 static int macvlan_device_event(struct notifier_block *unused,
1073 unsigned long event, void *ptr)
1074 {
1075 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1076 struct macvlan_dev *vlan, *next;
1077 struct macvlan_port *port;
1078 LIST_HEAD(list_kill);
1079
1080 if (!macvlan_port_exists(dev))
1081 return NOTIFY_DONE;
1082
1083 port = macvlan_port_get_rtnl(dev);
1084
1085 switch (event) {
1086 case NETDEV_CHANGE:
1087 list_for_each_entry(vlan, &port->vlans, list)
1088 netif_stacked_transfer_operstate(vlan->lowerdev,
1089 vlan->dev);
1090 break;
1091 case NETDEV_FEAT_CHANGE:
1092 list_for_each_entry(vlan, &port->vlans, list) {
1093 vlan->dev->gso_max_size = dev->gso_max_size;
1094 netdev_update_features(vlan->dev);
1095 }
1096 break;
1097 case NETDEV_UNREGISTER:
1098 /* twiddle thumbs on netns device moves */
1099 if (dev->reg_state != NETREG_UNREGISTERING)
1100 break;
1101
1102 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1103 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1104 unregister_netdevice_many(&list_kill);
1105 list_del(&list_kill);
1106 break;
1107 case NETDEV_PRE_TYPE_CHANGE:
1108 /* Forbid underlaying device to change its type. */
1109 return NOTIFY_BAD;
1110 }
1111 return NOTIFY_DONE;
1112 }
1113
1114 static struct notifier_block macvlan_notifier_block __read_mostly = {
1115 .notifier_call = macvlan_device_event,
1116 };
1117
1118 static int __init macvlan_init_module(void)
1119 {
1120 int err;
1121
1122 register_netdevice_notifier(&macvlan_notifier_block);
1123
1124 err = macvlan_link_register(&macvlan_link_ops);
1125 if (err < 0)
1126 goto err1;
1127 return 0;
1128 err1:
1129 unregister_netdevice_notifier(&macvlan_notifier_block);
1130 return err;
1131 }
1132
1133 static void __exit macvlan_cleanup_module(void)
1134 {
1135 rtnl_link_unregister(&macvlan_link_ops);
1136 unregister_netdevice_notifier(&macvlan_notifier_block);
1137 }
1138
1139 module_init(macvlan_init_module);
1140 module_exit(macvlan_cleanup_module);
1141
1142 MODULE_LICENSE("GPL");
1143 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1144 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1145 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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