?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
spi-topcliff-pch: supports a spi mode setup and bit order setup by IO control
[zen-stable.git] / drivers / net / macvlan.c
blob9ea99217f11609176d56459c3e35f55185e6f2af
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 <net/rtnetlink.h>
33 #include <net/xfrm.h>
34
35 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
36
37 struct macvlan_port {
38 struct net_device *dev;
39 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
40 struct list_head vlans;
41 struct rcu_head rcu;
42 bool passthru;
43 int count;
44 };
45
46 static void macvlan_port_destroy(struct net_device *dev);
47
48 #define macvlan_port_get_rcu(dev) \
49 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
50 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
51 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
52
53 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
54 const unsigned char *addr)
55 {
56 struct macvlan_dev *vlan;
57 struct hlist_node *n;
58
59 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
60 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
61 return vlan;
62 }
63 return NULL;
64 }
65
66 static void macvlan_hash_add(struct macvlan_dev *vlan)
67 {
68 struct macvlan_port *port = vlan->port;
69 const unsigned char *addr = vlan->dev->dev_addr;
70
71 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
72 }
73
74 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
75 {
76 hlist_del_rcu(&vlan->hlist);
77 if (sync)
78 synchronize_rcu();
79 }
80
81 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
82 const unsigned char *addr)
83 {
84 macvlan_hash_del(vlan, true);
85 /* Now that we are unhashed it is safe to change the device
86 * address without confusing packet delivery.
87 */
88 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
89 macvlan_hash_add(vlan);
90 }
91
92 static int macvlan_addr_busy(const struct macvlan_port *port,
93 const unsigned char *addr)
94 {
95 /* Test to see if the specified multicast address is
96 * currently in use by the underlying device or
97 * another macvlan.
98 */
99 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
100 return 1;
101
102 if (macvlan_hash_lookup(port, addr))
103 return 1;
104
105 return 0;
106 }
107
108
109 static int macvlan_broadcast_one(struct sk_buff *skb,
110 const struct macvlan_dev *vlan,
111 const struct ethhdr *eth, bool local)
112 {
113 struct net_device *dev = vlan->dev;
114 if (!skb)
115 return NET_RX_DROP;
116
117 if (local)
118 return vlan->forward(dev, skb);
119
120 skb->dev = dev;
121 if (!compare_ether_addr_64bits(eth->h_dest,
122 dev->broadcast))
123 skb->pkt_type = PACKET_BROADCAST;
124 else
125 skb->pkt_type = PACKET_MULTICAST;
126
127 return vlan->receive(skb);
128 }
129
130 static void macvlan_broadcast(struct sk_buff *skb,
131 const struct macvlan_port *port,
132 struct net_device *src,
133 enum macvlan_mode mode)
134 {
135 const struct ethhdr *eth = eth_hdr(skb);
136 const struct macvlan_dev *vlan;
137 struct hlist_node *n;
138 struct sk_buff *nskb;
139 unsigned int i;
140 int err;
141
142 if (skb->protocol == htons(ETH_P_PAUSE))
143 return;
144
145 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
146 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
147 if (vlan->dev == src || !(vlan->mode & mode))
148 continue;
149
150 nskb = skb_clone(skb, GFP_ATOMIC);
151 err = macvlan_broadcast_one(nskb, vlan, eth,
152 mode == MACVLAN_MODE_BRIDGE);
153 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
154 err == NET_RX_SUCCESS, 1);
155 }
156 }
157 }
158
159 /* called under rcu_read_lock() from netif_receive_skb */
160 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
161 {
162 struct macvlan_port *port;
163 struct sk_buff *skb = *pskb;
164 const struct ethhdr *eth = eth_hdr(skb);
165 const struct macvlan_dev *vlan;
166 const struct macvlan_dev *src;
167 struct net_device *dev;
168 unsigned int len = 0;
169 int ret = NET_RX_DROP;
170
171 port = macvlan_port_get_rcu(skb->dev);
172 if (is_multicast_ether_addr(eth->h_dest)) {
173 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
174 if (!skb)
175 return RX_HANDLER_CONSUMED;
176 eth = eth_hdr(skb);
177 src = macvlan_hash_lookup(port, eth->h_source);
178 if (!src)
179 /* frame comes from an external address */
180 macvlan_broadcast(skb, port, NULL,
181 MACVLAN_MODE_PRIVATE |
182 MACVLAN_MODE_VEPA |
183 MACVLAN_MODE_PASSTHRU|
184 MACVLAN_MODE_BRIDGE);
185 else if (src->mode == MACVLAN_MODE_VEPA)
186 /* flood to everyone except source */
187 macvlan_broadcast(skb, port, src->dev,
188 MACVLAN_MODE_VEPA |
189 MACVLAN_MODE_BRIDGE);
190 else if (src->mode == MACVLAN_MODE_BRIDGE)
191 /*
192 * flood only to VEPA ports, bridge ports
193 * already saw the frame on the way out.
194 */
195 macvlan_broadcast(skb, port, src->dev,
196 MACVLAN_MODE_VEPA);
197 else {
198 /* forward to original port. */
199 vlan = src;
200 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
201 goto out;
202 }
203
204 return RX_HANDLER_PASS;
205 }
206
207 if (port->passthru)
208 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
209 else
210 vlan = macvlan_hash_lookup(port, eth->h_dest);
211 if (vlan == NULL)
212 return RX_HANDLER_PASS;
213
214 dev = vlan->dev;
215 if (unlikely(!(dev->flags & IFF_UP))) {
216 kfree_skb(skb);
217 return RX_HANDLER_CONSUMED;
218 }
219 len = skb->len + ETH_HLEN;
220 skb = skb_share_check(skb, GFP_ATOMIC);
221 if (!skb)
222 goto out;
223
224 skb->dev = dev;
225 skb->pkt_type = PACKET_HOST;
226
227 ret = vlan->receive(skb);
228
229 out:
230 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
231 return RX_HANDLER_CONSUMED;
232 }
233
234 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
235 {
236 const struct macvlan_dev *vlan = netdev_priv(dev);
237 const struct macvlan_port *port = vlan->port;
238 const struct macvlan_dev *dest;
239 __u8 ip_summed = skb->ip_summed;
240
241 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
242 const struct ethhdr *eth = (void *)skb->data;
243 skb->ip_summed = CHECKSUM_UNNECESSARY;
244
245 /* send to other bridge ports directly */
246 if (is_multicast_ether_addr(eth->h_dest)) {
247 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
248 goto xmit_world;
249 }
250
251 dest = macvlan_hash_lookup(port, eth->h_dest);
252 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
253 /* send to lowerdev first for its network taps */
254 dev_forward_skb(vlan->lowerdev, skb);
255
256 return NET_XMIT_SUCCESS;
257 }
258 }
259
260 xmit_world:
261 skb->ip_summed = ip_summed;
262 skb_set_dev(skb, vlan->lowerdev);
263 return dev_queue_xmit(skb);
264 }
265
266 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
267 struct net_device *dev)
268 {
269 unsigned int len = skb->len;
270 int ret;
271 const struct macvlan_dev *vlan = netdev_priv(dev);
272
273 ret = macvlan_queue_xmit(skb, dev);
274 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
275 struct macvlan_pcpu_stats *pcpu_stats;
276
277 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
278 u64_stats_update_begin(&pcpu_stats->syncp);
279 pcpu_stats->tx_packets++;
280 pcpu_stats->tx_bytes += len;
281 u64_stats_update_end(&pcpu_stats->syncp);
282 } else {
283 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
284 }
285 return ret;
286 }
287 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
288
289 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
290 unsigned short type, const void *daddr,
291 const void *saddr, unsigned len)
292 {
293 const struct macvlan_dev *vlan = netdev_priv(dev);
294 struct net_device *lowerdev = vlan->lowerdev;
295
296 return dev_hard_header(skb, lowerdev, type, daddr,
297 saddr ? : dev->dev_addr, len);
298 }
299
300 static const struct header_ops macvlan_hard_header_ops = {
301 .create = macvlan_hard_header,
302 .rebuild = eth_rebuild_header,
303 .parse = eth_header_parse,
304 .cache = eth_header_cache,
305 .cache_update = eth_header_cache_update,
306 };
307
308 static int macvlan_open(struct net_device *dev)
309 {
310 struct macvlan_dev *vlan = netdev_priv(dev);
311 struct net_device *lowerdev = vlan->lowerdev;
312 int err;
313
314 if (vlan->port->passthru) {
315 dev_set_promiscuity(lowerdev, 1);
316 goto hash_add;
317 }
318
319 err = -EBUSY;
320 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
321 goto out;
322
323 err = dev_uc_add(lowerdev, dev->dev_addr);
324 if (err < 0)
325 goto out;
326 if (dev->flags & IFF_ALLMULTI) {
327 err = dev_set_allmulti(lowerdev, 1);
328 if (err < 0)
329 goto del_unicast;
330 }
331
332 hash_add:
333 macvlan_hash_add(vlan);
334 return 0;
335
336 del_unicast:
337 dev_uc_del(lowerdev, dev->dev_addr);
338 out:
339 return err;
340 }
341
342 static int macvlan_stop(struct net_device *dev)
343 {
344 struct macvlan_dev *vlan = netdev_priv(dev);
345 struct net_device *lowerdev = vlan->lowerdev;
346
347 if (vlan->port->passthru) {
348 dev_set_promiscuity(lowerdev, -1);
349 goto hash_del;
350 }
351
352 dev_mc_unsync(lowerdev, dev);
353 if (dev->flags & IFF_ALLMULTI)
354 dev_set_allmulti(lowerdev, -1);
355
356 dev_uc_del(lowerdev, dev->dev_addr);
357
358 hash_del:
359 macvlan_hash_del(vlan, !dev->dismantle);
360 return 0;
361 }
362
363 static int macvlan_set_mac_address(struct net_device *dev, void *p)
364 {
365 struct macvlan_dev *vlan = netdev_priv(dev);
366 struct net_device *lowerdev = vlan->lowerdev;
367 struct sockaddr *addr = p;
368 int err;
369
370 if (!is_valid_ether_addr(addr->sa_data))
371 return -EADDRNOTAVAIL;
372
373 if (!(dev->flags & IFF_UP)) {
374 /* Just copy in the new address */
375 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
376 } else {
377 /* Rehash and update the device filters */
378 if (macvlan_addr_busy(vlan->port, addr->sa_data))
379 return -EBUSY;
380
381 err = dev_uc_add(lowerdev, addr->sa_data);
382 if (err)
383 return err;
384
385 dev_uc_del(lowerdev, dev->dev_addr);
386
387 macvlan_hash_change_addr(vlan, addr->sa_data);
388 }
389 return 0;
390 }
391
392 static void macvlan_change_rx_flags(struct net_device *dev, int change)
393 {
394 struct macvlan_dev *vlan = netdev_priv(dev);
395 struct net_device *lowerdev = vlan->lowerdev;
396
397 if (change & IFF_ALLMULTI)
398 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
399 }
400
401 static void macvlan_set_multicast_list(struct net_device *dev)
402 {
403 struct macvlan_dev *vlan = netdev_priv(dev);
404
405 dev_mc_sync(vlan->lowerdev, dev);
406 }
407
408 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
409 {
410 struct macvlan_dev *vlan = netdev_priv(dev);
411
412 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
413 return -EINVAL;
414 dev->mtu = new_mtu;
415 return 0;
416 }
417
418 /*
419 * macvlan network devices have devices nesting below it and are a special
420 * "super class" of normal network devices; split their locks off into a
421 * separate class since they always nest.
422 */
423 static struct lock_class_key macvlan_netdev_xmit_lock_key;
424 static struct lock_class_key macvlan_netdev_addr_lock_key;
425
426 #define MACVLAN_FEATURES \
427 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
428 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
429 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
430 NETIF_F_HW_VLAN_FILTER)
431
432 #define MACVLAN_STATE_MASK \
433 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
434
435 static void macvlan_set_lockdep_class_one(struct net_device *dev,
436 struct netdev_queue *txq,
437 void *_unused)
438 {
439 lockdep_set_class(&txq->_xmit_lock,
440 &macvlan_netdev_xmit_lock_key);
441 }
442
443 static void macvlan_set_lockdep_class(struct net_device *dev)
444 {
445 lockdep_set_class(&dev->addr_list_lock,
446 &macvlan_netdev_addr_lock_key);
447 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
448 }
449
450 static int macvlan_init(struct net_device *dev)
451 {
452 struct macvlan_dev *vlan = netdev_priv(dev);
453 const struct net_device *lowerdev = vlan->lowerdev;
454
455 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
456 (lowerdev->state & MACVLAN_STATE_MASK);
457 dev->features = lowerdev->features & MACVLAN_FEATURES;
458 dev->features |= NETIF_F_LLTX;
459 dev->gso_max_size = lowerdev->gso_max_size;
460 dev->iflink = lowerdev->ifindex;
461 dev->hard_header_len = lowerdev->hard_header_len;
462
463 macvlan_set_lockdep_class(dev);
464
465 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
466 if (!vlan->pcpu_stats)
467 return -ENOMEM;
468
469 return 0;
470 }
471
472 static void macvlan_uninit(struct net_device *dev)
473 {
474 struct macvlan_dev *vlan = netdev_priv(dev);
475 struct macvlan_port *port = vlan->port;
476
477 free_percpu(vlan->pcpu_stats);
478
479 port->count -= 1;
480 if (!port->count)
481 macvlan_port_destroy(port->dev);
482 }
483
484 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
485 struct rtnl_link_stats64 *stats)
486 {
487 struct macvlan_dev *vlan = netdev_priv(dev);
488
489 if (vlan->pcpu_stats) {
490 struct macvlan_pcpu_stats *p;
491 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
492 u32 rx_errors = 0, tx_dropped = 0;
493 unsigned int start;
494 int i;
495
496 for_each_possible_cpu(i) {
497 p = per_cpu_ptr(vlan->pcpu_stats, i);
498 do {
499 start = u64_stats_fetch_begin_bh(&p->syncp);
500 rx_packets = p->rx_packets;
501 rx_bytes = p->rx_bytes;
502 rx_multicast = p->rx_multicast;
503 tx_packets = p->tx_packets;
504 tx_bytes = p->tx_bytes;
505 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
506
507 stats->rx_packets += rx_packets;
508 stats->rx_bytes += rx_bytes;
509 stats->multicast += rx_multicast;
510 stats->tx_packets += tx_packets;
511 stats->tx_bytes += tx_bytes;
512 /* rx_errors & tx_dropped are u32, updated
513 * without syncp protection.
514 */
515 rx_errors += p->rx_errors;
516 tx_dropped += p->tx_dropped;
517 }
518 stats->rx_errors = rx_errors;
519 stats->rx_dropped = rx_errors;
520 stats->tx_dropped = tx_dropped;
521 }
522 return stats;
523 }
524
525 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
526 unsigned short vid)
527 {
528 struct macvlan_dev *vlan = netdev_priv(dev);
529 struct net_device *lowerdev = vlan->lowerdev;
530
531 return vlan_vid_add(lowerdev, vid);
532 }
533
534 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
535 unsigned short vid)
536 {
537 struct macvlan_dev *vlan = netdev_priv(dev);
538 struct net_device *lowerdev = vlan->lowerdev;
539
540 vlan_vid_del(lowerdev, vid);
541 return 0;
542 }
543
544 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
545 struct ethtool_drvinfo *drvinfo)
546 {
547 snprintf(drvinfo->driver, 32, "macvlan");
548 snprintf(drvinfo->version, 32, "0.1");
549 }
550
551 static int macvlan_ethtool_get_settings(struct net_device *dev,
552 struct ethtool_cmd *cmd)
553 {
554 const struct macvlan_dev *vlan = netdev_priv(dev);
555
556 return __ethtool_get_settings(vlan->lowerdev, cmd);
557 }
558
559 static const struct ethtool_ops macvlan_ethtool_ops = {
560 .get_link = ethtool_op_get_link,
561 .get_settings = macvlan_ethtool_get_settings,
562 .get_drvinfo = macvlan_ethtool_get_drvinfo,
563 };
564
565 static const struct net_device_ops macvlan_netdev_ops = {
566 .ndo_init = macvlan_init,
567 .ndo_uninit = macvlan_uninit,
568 .ndo_open = macvlan_open,
569 .ndo_stop = macvlan_stop,
570 .ndo_start_xmit = macvlan_start_xmit,
571 .ndo_change_mtu = macvlan_change_mtu,
572 .ndo_change_rx_flags = macvlan_change_rx_flags,
573 .ndo_set_mac_address = macvlan_set_mac_address,
574 .ndo_set_rx_mode = macvlan_set_multicast_list,
575 .ndo_get_stats64 = macvlan_dev_get_stats64,
576 .ndo_validate_addr = eth_validate_addr,
577 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
578 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
579 };
580
581 void macvlan_common_setup(struct net_device *dev)
582 {
583 ether_setup(dev);
584
585 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
586 dev->netdev_ops = &macvlan_netdev_ops;
587 dev->destructor = free_netdev;
588 dev->header_ops = &macvlan_hard_header_ops,
589 dev->ethtool_ops = &macvlan_ethtool_ops;
590 }
591 EXPORT_SYMBOL_GPL(macvlan_common_setup);
592
593 static void macvlan_setup(struct net_device *dev)
594 {
595 macvlan_common_setup(dev);
596 dev->tx_queue_len = 0;
597 }
598
599 static int macvlan_port_create(struct net_device *dev)
600 {
601 struct macvlan_port *port;
602 unsigned int i;
603 int err;
604
605 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
606 return -EINVAL;
607
608 port = kzalloc(sizeof(*port), GFP_KERNEL);
609 if (port == NULL)
610 return -ENOMEM;
611
612 port->passthru = false;
613 port->dev = dev;
614 INIT_LIST_HEAD(&port->vlans);
615 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
616 INIT_HLIST_HEAD(&port->vlan_hash[i]);
617
618 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
619 if (err)
620 kfree(port);
621 else
622 dev->priv_flags |= IFF_MACVLAN_PORT;
623 return err;
624 }
625
626 static void macvlan_port_destroy(struct net_device *dev)
627 {
628 struct macvlan_port *port = macvlan_port_get(dev);
629
630 dev->priv_flags &= ~IFF_MACVLAN_PORT;
631 netdev_rx_handler_unregister(dev);
632 kfree_rcu(port, rcu);
633 }
634
635 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
636 {
637 if (tb[IFLA_ADDRESS]) {
638 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
639 return -EINVAL;
640 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
641 return -EADDRNOTAVAIL;
642 }
643
644 if (data && data[IFLA_MACVLAN_MODE]) {
645 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
646 case MACVLAN_MODE_PRIVATE:
647 case MACVLAN_MODE_VEPA:
648 case MACVLAN_MODE_BRIDGE:
649 case MACVLAN_MODE_PASSTHRU:
650 break;
651 default:
652 return -EINVAL;
653 }
654 }
655 return 0;
656 }
657
658 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
659 struct nlattr *tb[], struct nlattr *data[],
660 int (*receive)(struct sk_buff *skb),
661 int (*forward)(struct net_device *dev,
662 struct sk_buff *skb))
663 {
664 struct macvlan_dev *vlan = netdev_priv(dev);
665 struct macvlan_port *port;
666 struct net_device *lowerdev;
667 int err;
668
669 if (!tb[IFLA_LINK])
670 return -EINVAL;
671
672 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
673 if (lowerdev == NULL)
674 return -ENODEV;
675
676 /* When creating macvlans on top of other macvlans - use
677 * the real device as the lowerdev.
678 */
679 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
680 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
681 lowerdev = lowervlan->lowerdev;
682 }
683
684 if (!tb[IFLA_MTU])
685 dev->mtu = lowerdev->mtu;
686 else if (dev->mtu > lowerdev->mtu)
687 return -EINVAL;
688
689 if (!tb[IFLA_ADDRESS])
690 random_ether_addr(dev->dev_addr);
691
692 if (!macvlan_port_exists(lowerdev)) {
693 err = macvlan_port_create(lowerdev);
694 if (err < 0)
695 return err;
696 }
697 port = macvlan_port_get(lowerdev);
698
699 /* Only 1 macvlan device can be created in passthru mode */
700 if (port->passthru)
701 return -EINVAL;
702
703 vlan->lowerdev = lowerdev;
704 vlan->dev = dev;
705 vlan->port = port;
706 vlan->receive = receive;
707 vlan->forward = forward;
708
709 vlan->mode = MACVLAN_MODE_VEPA;
710 if (data && data[IFLA_MACVLAN_MODE])
711 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
712
713 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
714 if (port->count)
715 return -EINVAL;
716 port->passthru = true;
717 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
718 }
719
720 port->count += 1;
721 err = register_netdevice(dev);
722 if (err < 0)
723 goto destroy_port;
724
725 list_add_tail(&vlan->list, &port->vlans);
726 netif_stacked_transfer_operstate(lowerdev, dev);
727
728 return 0;
729
730 destroy_port:
731 port->count -= 1;
732 if (!port->count)
733 macvlan_port_destroy(lowerdev);
734
735 return err;
736 }
737 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
738
739 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
740 struct nlattr *tb[], struct nlattr *data[])
741 {
742 return macvlan_common_newlink(src_net, dev, tb, data,
743 netif_rx,
744 dev_forward_skb);
745 }
746
747 void macvlan_dellink(struct net_device *dev, struct list_head *head)
748 {
749 struct macvlan_dev *vlan = netdev_priv(dev);
750
751 list_del(&vlan->list);
752 unregister_netdevice_queue(dev, head);
753 }
754 EXPORT_SYMBOL_GPL(macvlan_dellink);
755
756 static int macvlan_changelink(struct net_device *dev,
757 struct nlattr *tb[], struct nlattr *data[])
758 {
759 struct macvlan_dev *vlan = netdev_priv(dev);
760 if (data && data[IFLA_MACVLAN_MODE])
761 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
762 return 0;
763 }
764
765 static size_t macvlan_get_size(const struct net_device *dev)
766 {
767 return nla_total_size(4);
768 }
769
770 static int macvlan_fill_info(struct sk_buff *skb,
771 const struct net_device *dev)
772 {
773 struct macvlan_dev *vlan = netdev_priv(dev);
774
775 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
776 return 0;
777
778 nla_put_failure:
779 return -EMSGSIZE;
780 }
781
782 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
783 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
784 };
785
786 int macvlan_link_register(struct rtnl_link_ops *ops)
787 {
788 /* common fields */
789 ops->priv_size = sizeof(struct macvlan_dev);
790 ops->validate = macvlan_validate;
791 ops->maxtype = IFLA_MACVLAN_MAX;
792 ops->policy = macvlan_policy;
793 ops->changelink = macvlan_changelink;
794 ops->get_size = macvlan_get_size;
795 ops->fill_info = macvlan_fill_info;
796
797 return rtnl_link_register(ops);
798 };
799 EXPORT_SYMBOL_GPL(macvlan_link_register);
800
801 static struct rtnl_link_ops macvlan_link_ops = {
802 .kind = "macvlan",
803 .setup = macvlan_setup,
804 .newlink = macvlan_newlink,
805 .dellink = macvlan_dellink,
806 };
807
808 static int macvlan_device_event(struct notifier_block *unused,
809 unsigned long event, void *ptr)
810 {
811 struct net_device *dev = ptr;
812 struct macvlan_dev *vlan, *next;
813 struct macvlan_port *port;
814 LIST_HEAD(list_kill);
815
816 if (!macvlan_port_exists(dev))
817 return NOTIFY_DONE;
818
819 port = macvlan_port_get(dev);
820
821 switch (event) {
822 case NETDEV_CHANGE:
823 list_for_each_entry(vlan, &port->vlans, list)
824 netif_stacked_transfer_operstate(vlan->lowerdev,
825 vlan->dev);
826 break;
827 case NETDEV_FEAT_CHANGE:
828 list_for_each_entry(vlan, &port->vlans, list) {
829 vlan->dev->features = dev->features & MACVLAN_FEATURES;
830 vlan->dev->gso_max_size = dev->gso_max_size;
831 netdev_features_change(vlan->dev);
832 }
833 break;
834 case NETDEV_UNREGISTER:
835 /* twiddle thumbs on netns device moves */
836 if (dev->reg_state != NETREG_UNREGISTERING)
837 break;
838
839 list_for_each_entry_safe(vlan, next, &port->vlans, list)
840 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
841 unregister_netdevice_many(&list_kill);
842 list_del(&list_kill);
843 break;
844 case NETDEV_PRE_TYPE_CHANGE:
845 /* Forbid underlaying device to change its type. */
846 return NOTIFY_BAD;
847 }
848 return NOTIFY_DONE;
849 }
850
851 static struct notifier_block macvlan_notifier_block __read_mostly = {
852 .notifier_call = macvlan_device_event,
853 };
854
855 static int __init macvlan_init_module(void)
856 {
857 int err;
858
859 register_netdevice_notifier(&macvlan_notifier_block);
860
861 err = macvlan_link_register(&macvlan_link_ops);
862 if (err < 0)
863 goto err1;
864 return 0;
865 err1:
866 unregister_netdevice_notifier(&macvlan_notifier_block);
867 return err;
868 }
869
870 static void __exit macvlan_cleanup_module(void)
871 {
872 rtnl_link_unregister(&macvlan_link_ops);
873 unregister_netdevice_notifier(&macvlan_notifier_block);
874 }
875
876 module_init(macvlan_init_module);
877 module_exit(macvlan_cleanup_module);
878
879 MODULE_LICENSE("GPL");
880 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
881 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
882 MODULE_ALIAS_RTNL_LINK("macvlan");