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