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ath9k_hw: define registers/macros to support Antenna diversity
[linux-2.6/libata-dev.git] / drivers / net / macvlan.c
blob78e34e9e4f0082c12baf559ad0a242c2c48f2231
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_link.h>
30 #include <linux/if_macvlan.h>
31 #include <net/rtnetlink.h>
32 #include <net/xfrm.h>
33
34 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
35
36 struct macvlan_port {
37 struct net_device *dev;
38 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
39 struct list_head vlans;
40 struct rcu_head rcu;
41 bool passthru;
42 int count;
43 };
44
45 static void macvlan_port_destroy(struct net_device *dev);
46
47 #define macvlan_port_get_rcu(dev) \
48 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
49 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
50 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
51
52 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
53 const unsigned char *addr)
54 {
55 struct macvlan_dev *vlan;
56 struct hlist_node *n;
57
58 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
59 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
60 return vlan;
61 }
62 return NULL;
63 }
64
65 static void macvlan_hash_add(struct macvlan_dev *vlan)
66 {
67 struct macvlan_port *port = vlan->port;
68 const unsigned char *addr = vlan->dev->dev_addr;
69
70 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
71 }
72
73 static void macvlan_hash_del(struct macvlan_dev *vlan)
74 {
75 hlist_del_rcu(&vlan->hlist);
76 synchronize_rcu();
77 }
78
79 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
80 const unsigned char *addr)
81 {
82 macvlan_hash_del(vlan);
83 /* Now that we are unhashed it is safe to change the device
84 * address without confusing packet delivery.
85 */
86 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
87 macvlan_hash_add(vlan);
88 }
89
90 static int macvlan_addr_busy(const struct macvlan_port *port,
91 const unsigned char *addr)
92 {
93 /* Test to see if the specified multicast address is
94 * currently in use by the underlying device or
95 * another macvlan.
96 */
97 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
98 return 1;
99
100 if (macvlan_hash_lookup(port, addr))
101 return 1;
102
103 return 0;
104 }
105
106
107 static int macvlan_broadcast_one(struct sk_buff *skb,
108 const struct macvlan_dev *vlan,
109 const struct ethhdr *eth, bool local)
110 {
111 struct net_device *dev = vlan->dev;
112 if (!skb)
113 return NET_RX_DROP;
114
115 if (local)
116 return vlan->forward(dev, skb);
117
118 skb->dev = dev;
119 if (!compare_ether_addr_64bits(eth->h_dest,
120 dev->broadcast))
121 skb->pkt_type = PACKET_BROADCAST;
122 else
123 skb->pkt_type = PACKET_MULTICAST;
124
125 return vlan->receive(skb);
126 }
127
128 static void macvlan_broadcast(struct sk_buff *skb,
129 const struct macvlan_port *port,
130 struct net_device *src,
131 enum macvlan_mode mode)
132 {
133 const struct ethhdr *eth = eth_hdr(skb);
134 const struct macvlan_dev *vlan;
135 struct hlist_node *n;
136 struct sk_buff *nskb;
137 unsigned int i;
138 int err;
139
140 if (skb->protocol == htons(ETH_P_PAUSE))
141 return;
142
143 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
144 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
145 if (vlan->dev == src || !(vlan->mode & mode))
146 continue;
147
148 nskb = skb_clone(skb, GFP_ATOMIC);
149 err = macvlan_broadcast_one(nskb, vlan, eth,
150 mode == MACVLAN_MODE_BRIDGE);
151 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
152 err == NET_RX_SUCCESS, 1);
153 }
154 }
155 }
156
157 /* called under rcu_read_lock() from netif_receive_skb */
158 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
159 {
160 struct macvlan_port *port;
161 struct sk_buff *skb = *pskb;
162 const struct ethhdr *eth = eth_hdr(skb);
163 const struct macvlan_dev *vlan;
164 const struct macvlan_dev *src;
165 struct net_device *dev;
166 unsigned int len = 0;
167 int ret = NET_RX_DROP;
168
169 port = macvlan_port_get_rcu(skb->dev);
170 if (is_multicast_ether_addr(eth->h_dest)) {
171 src = macvlan_hash_lookup(port, eth->h_source);
172 if (!src)
173 /* frame comes from an external address */
174 macvlan_broadcast(skb, port, NULL,
175 MACVLAN_MODE_PRIVATE |
176 MACVLAN_MODE_VEPA |
177 MACVLAN_MODE_PASSTHRU|
178 MACVLAN_MODE_BRIDGE);
179 else if (src->mode == MACVLAN_MODE_VEPA)
180 /* flood to everyone except source */
181 macvlan_broadcast(skb, port, src->dev,
182 MACVLAN_MODE_VEPA |
183 MACVLAN_MODE_BRIDGE);
184 else if (src->mode == MACVLAN_MODE_BRIDGE)
185 /*
186 * flood only to VEPA ports, bridge ports
187 * already saw the frame on the way out.
188 */
189 macvlan_broadcast(skb, port, src->dev,
190 MACVLAN_MODE_VEPA);
191 return RX_HANDLER_PASS;
192 }
193
194 if (port->passthru)
195 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
196 else
197 vlan = macvlan_hash_lookup(port, eth->h_dest);
198 if (vlan == NULL)
199 return RX_HANDLER_PASS;
200
201 dev = vlan->dev;
202 if (unlikely(!(dev->flags & IFF_UP))) {
203 kfree_skb(skb);
204 return RX_HANDLER_CONSUMED;
205 }
206 len = skb->len + ETH_HLEN;
207 skb = skb_share_check(skb, GFP_ATOMIC);
208 if (!skb)
209 goto out;
210
211 skb->dev = dev;
212 skb->pkt_type = PACKET_HOST;
213
214 ret = vlan->receive(skb);
215
216 out:
217 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
218 return RX_HANDLER_CONSUMED;
219 }
220
221 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
222 {
223 const struct macvlan_dev *vlan = netdev_priv(dev);
224 const struct macvlan_port *port = vlan->port;
225 const struct macvlan_dev *dest;
226 __u8 ip_summed = skb->ip_summed;
227
228 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
229 const struct ethhdr *eth = (void *)skb->data;
230 skb->ip_summed = CHECKSUM_UNNECESSARY;
231
232 /* send to other bridge ports directly */
233 if (is_multicast_ether_addr(eth->h_dest)) {
234 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
235 goto xmit_world;
236 }
237
238 dest = macvlan_hash_lookup(port, eth->h_dest);
239 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
240 unsigned int length = skb->len + ETH_HLEN;
241 int ret = dest->forward(dest->dev, skb);
242 macvlan_count_rx(dest, length,
243 ret == NET_RX_SUCCESS, 0);
244
245 return NET_XMIT_SUCCESS;
246 }
247 }
248
249 xmit_world:
250 skb->ip_summed = ip_summed;
251 skb_set_dev(skb, vlan->lowerdev);
252 return dev_queue_xmit(skb);
253 }
254
255 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
256 struct net_device *dev)
257 {
258 unsigned int len = skb->len;
259 int ret;
260 const struct macvlan_dev *vlan = netdev_priv(dev);
261
262 ret = macvlan_queue_xmit(skb, dev);
263 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
264 struct macvlan_pcpu_stats *pcpu_stats;
265
266 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
267 u64_stats_update_begin(&pcpu_stats->syncp);
268 pcpu_stats->tx_packets++;
269 pcpu_stats->tx_bytes += len;
270 u64_stats_update_end(&pcpu_stats->syncp);
271 } else {
272 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
273 }
274 return ret;
275 }
276 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
277
278 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
279 unsigned short type, const void *daddr,
280 const void *saddr, unsigned len)
281 {
282 const struct macvlan_dev *vlan = netdev_priv(dev);
283 struct net_device *lowerdev = vlan->lowerdev;
284
285 return dev_hard_header(skb, lowerdev, type, daddr,
286 saddr ? : dev->dev_addr, len);
287 }
288
289 static const struct header_ops macvlan_hard_header_ops = {
290 .create = macvlan_hard_header,
291 .rebuild = eth_rebuild_header,
292 .parse = eth_header_parse,
293 .cache = eth_header_cache,
294 .cache_update = eth_header_cache_update,
295 };
296
297 static int macvlan_open(struct net_device *dev)
298 {
299 struct macvlan_dev *vlan = netdev_priv(dev);
300 struct net_device *lowerdev = vlan->lowerdev;
301 int err;
302
303 if (vlan->port->passthru) {
304 dev_set_promiscuity(lowerdev, 1);
305 goto hash_add;
306 }
307
308 err = -EBUSY;
309 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
310 goto out;
311
312 err = dev_uc_add(lowerdev, dev->dev_addr);
313 if (err < 0)
314 goto out;
315 if (dev->flags & IFF_ALLMULTI) {
316 err = dev_set_allmulti(lowerdev, 1);
317 if (err < 0)
318 goto del_unicast;
319 }
320
321 hash_add:
322 macvlan_hash_add(vlan);
323 return 0;
324
325 del_unicast:
326 dev_uc_del(lowerdev, dev->dev_addr);
327 out:
328 return err;
329 }
330
331 static int macvlan_stop(struct net_device *dev)
332 {
333 struct macvlan_dev *vlan = netdev_priv(dev);
334 struct net_device *lowerdev = vlan->lowerdev;
335
336 if (vlan->port->passthru) {
337 dev_set_promiscuity(lowerdev, -1);
338 goto hash_del;
339 }
340
341 dev_mc_unsync(lowerdev, dev);
342 if (dev->flags & IFF_ALLMULTI)
343 dev_set_allmulti(lowerdev, -1);
344
345 dev_uc_del(lowerdev, dev->dev_addr);
346
347 hash_del:
348 macvlan_hash_del(vlan);
349 return 0;
350 }
351
352 static int macvlan_set_mac_address(struct net_device *dev, void *p)
353 {
354 struct macvlan_dev *vlan = netdev_priv(dev);
355 struct net_device *lowerdev = vlan->lowerdev;
356 struct sockaddr *addr = p;
357 int err;
358
359 if (!is_valid_ether_addr(addr->sa_data))
360 return -EADDRNOTAVAIL;
361
362 if (!(dev->flags & IFF_UP)) {
363 /* Just copy in the new address */
364 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
365 } else {
366 /* Rehash and update the device filters */
367 if (macvlan_addr_busy(vlan->port, addr->sa_data))
368 return -EBUSY;
369
370 err = dev_uc_add(lowerdev, addr->sa_data);
371 if (err)
372 return err;
373
374 dev_uc_del(lowerdev, dev->dev_addr);
375
376 macvlan_hash_change_addr(vlan, addr->sa_data);
377 }
378 return 0;
379 }
380
381 static void macvlan_change_rx_flags(struct net_device *dev, int change)
382 {
383 struct macvlan_dev *vlan = netdev_priv(dev);
384 struct net_device *lowerdev = vlan->lowerdev;
385
386 if (change & IFF_ALLMULTI)
387 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
388 }
389
390 static void macvlan_set_multicast_list(struct net_device *dev)
391 {
392 struct macvlan_dev *vlan = netdev_priv(dev);
393
394 dev_mc_sync(vlan->lowerdev, dev);
395 }
396
397 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
398 {
399 struct macvlan_dev *vlan = netdev_priv(dev);
400
401 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
402 return -EINVAL;
403 dev->mtu = new_mtu;
404 return 0;
405 }
406
407 /*
408 * macvlan network devices have devices nesting below it and are a special
409 * "super class" of normal network devices; split their locks off into a
410 * separate class since they always nest.
411 */
412 static struct lock_class_key macvlan_netdev_xmit_lock_key;
413 static struct lock_class_key macvlan_netdev_addr_lock_key;
414
415 #define MACVLAN_FEATURES \
416 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
417 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
418 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO)
419
420 #define MACVLAN_STATE_MASK \
421 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
422
423 static void macvlan_set_lockdep_class_one(struct net_device *dev,
424 struct netdev_queue *txq,
425 void *_unused)
426 {
427 lockdep_set_class(&txq->_xmit_lock,
428 &macvlan_netdev_xmit_lock_key);
429 }
430
431 static void macvlan_set_lockdep_class(struct net_device *dev)
432 {
433 lockdep_set_class(&dev->addr_list_lock,
434 &macvlan_netdev_addr_lock_key);
435 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
436 }
437
438 static int macvlan_init(struct net_device *dev)
439 {
440 struct macvlan_dev *vlan = netdev_priv(dev);
441 const struct net_device *lowerdev = vlan->lowerdev;
442
443 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
444 (lowerdev->state & MACVLAN_STATE_MASK);
445 dev->features = lowerdev->features & MACVLAN_FEATURES;
446 dev->features |= NETIF_F_LLTX;
447 dev->gso_max_size = lowerdev->gso_max_size;
448 dev->iflink = lowerdev->ifindex;
449 dev->hard_header_len = lowerdev->hard_header_len;
450
451 macvlan_set_lockdep_class(dev);
452
453 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
454 if (!vlan->pcpu_stats)
455 return -ENOMEM;
456
457 return 0;
458 }
459
460 static void macvlan_uninit(struct net_device *dev)
461 {
462 struct macvlan_dev *vlan = netdev_priv(dev);
463 struct macvlan_port *port = vlan->port;
464
465 free_percpu(vlan->pcpu_stats);
466
467 port->count -= 1;
468 if (!port->count)
469 macvlan_port_destroy(port->dev);
470 }
471
472 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
473 struct rtnl_link_stats64 *stats)
474 {
475 struct macvlan_dev *vlan = netdev_priv(dev);
476
477 if (vlan->pcpu_stats) {
478 struct macvlan_pcpu_stats *p;
479 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
480 u32 rx_errors = 0, tx_dropped = 0;
481 unsigned int start;
482 int i;
483
484 for_each_possible_cpu(i) {
485 p = per_cpu_ptr(vlan->pcpu_stats, i);
486 do {
487 start = u64_stats_fetch_begin_bh(&p->syncp);
488 rx_packets = p->rx_packets;
489 rx_bytes = p->rx_bytes;
490 rx_multicast = p->rx_multicast;
491 tx_packets = p->tx_packets;
492 tx_bytes = p->tx_bytes;
493 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
494
495 stats->rx_packets += rx_packets;
496 stats->rx_bytes += rx_bytes;
497 stats->multicast += rx_multicast;
498 stats->tx_packets += tx_packets;
499 stats->tx_bytes += tx_bytes;
500 /* rx_errors & tx_dropped are u32, updated
501 * without syncp protection.
502 */
503 rx_errors += p->rx_errors;
504 tx_dropped += p->tx_dropped;
505 }
506 stats->rx_errors = rx_errors;
507 stats->rx_dropped = rx_errors;
508 stats->tx_dropped = tx_dropped;
509 }
510 return stats;
511 }
512
513 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
514 struct ethtool_drvinfo *drvinfo)
515 {
516 snprintf(drvinfo->driver, 32, "macvlan");
517 snprintf(drvinfo->version, 32, "0.1");
518 }
519
520 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
521 {
522 const struct macvlan_dev *vlan = netdev_priv(dev);
523 return dev_ethtool_get_rx_csum(vlan->lowerdev);
524 }
525
526 static int macvlan_ethtool_get_settings(struct net_device *dev,
527 struct ethtool_cmd *cmd)
528 {
529 const struct macvlan_dev *vlan = netdev_priv(dev);
530 return dev_ethtool_get_settings(vlan->lowerdev, cmd);
531 }
532
533 static u32 macvlan_ethtool_get_flags(struct net_device *dev)
534 {
535 const struct macvlan_dev *vlan = netdev_priv(dev);
536 return dev_ethtool_get_flags(vlan->lowerdev);
537 }
538
539 static const struct ethtool_ops macvlan_ethtool_ops = {
540 .get_link = ethtool_op_get_link,
541 .get_settings = macvlan_ethtool_get_settings,
542 .get_rx_csum = macvlan_ethtool_get_rx_csum,
543 .get_drvinfo = macvlan_ethtool_get_drvinfo,
544 .get_flags = macvlan_ethtool_get_flags,
545 };
546
547 static const struct net_device_ops macvlan_netdev_ops = {
548 .ndo_init = macvlan_init,
549 .ndo_uninit = macvlan_uninit,
550 .ndo_open = macvlan_open,
551 .ndo_stop = macvlan_stop,
552 .ndo_start_xmit = macvlan_start_xmit,
553 .ndo_change_mtu = macvlan_change_mtu,
554 .ndo_change_rx_flags = macvlan_change_rx_flags,
555 .ndo_set_mac_address = macvlan_set_mac_address,
556 .ndo_set_multicast_list = macvlan_set_multicast_list,
557 .ndo_get_stats64 = macvlan_dev_get_stats64,
558 .ndo_validate_addr = eth_validate_addr,
559 };
560
561 void macvlan_common_setup(struct net_device *dev)
562 {
563 ether_setup(dev);
564
565 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
566 dev->netdev_ops = &macvlan_netdev_ops;
567 dev->destructor = free_netdev;
568 dev->header_ops = &macvlan_hard_header_ops,
569 dev->ethtool_ops = &macvlan_ethtool_ops;
570 }
571 EXPORT_SYMBOL_GPL(macvlan_common_setup);
572
573 static void macvlan_setup(struct net_device *dev)
574 {
575 macvlan_common_setup(dev);
576 dev->tx_queue_len = 0;
577 }
578
579 static int macvlan_port_create(struct net_device *dev)
580 {
581 struct macvlan_port *port;
582 unsigned int i;
583 int err;
584
585 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
586 return -EINVAL;
587
588 port = kzalloc(sizeof(*port), GFP_KERNEL);
589 if (port == NULL)
590 return -ENOMEM;
591
592 port->passthru = false;
593 port->dev = dev;
594 INIT_LIST_HEAD(&port->vlans);
595 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
596 INIT_HLIST_HEAD(&port->vlan_hash[i]);
597
598 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
599 if (err)
600 kfree(port);
601
602 dev->priv_flags |= IFF_MACVLAN_PORT;
603 return err;
604 }
605
606 static void macvlan_port_rcu_free(struct rcu_head *head)
607 {
608 struct macvlan_port *port;
609
610 port = container_of(head, struct macvlan_port, rcu);
611 kfree(port);
612 }
613
614 static void macvlan_port_destroy(struct net_device *dev)
615 {
616 struct macvlan_port *port = macvlan_port_get(dev);
617
618 dev->priv_flags &= ~IFF_MACVLAN_PORT;
619 netdev_rx_handler_unregister(dev);
620 call_rcu(&port->rcu, macvlan_port_rcu_free);
621 }
622
623 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
624 {
625 if (tb[IFLA_ADDRESS]) {
626 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
627 return -EINVAL;
628 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
629 return -EADDRNOTAVAIL;
630 }
631
632 if (data && data[IFLA_MACVLAN_MODE]) {
633 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
634 case MACVLAN_MODE_PRIVATE:
635 case MACVLAN_MODE_VEPA:
636 case MACVLAN_MODE_BRIDGE:
637 case MACVLAN_MODE_PASSTHRU:
638 break;
639 default:
640 return -EINVAL;
641 }
642 }
643 return 0;
644 }
645
646 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
647 struct nlattr *tb[], struct nlattr *data[],
648 int (*receive)(struct sk_buff *skb),
649 int (*forward)(struct net_device *dev,
650 struct sk_buff *skb))
651 {
652 struct macvlan_dev *vlan = netdev_priv(dev);
653 struct macvlan_port *port;
654 struct net_device *lowerdev;
655 int err;
656
657 if (!tb[IFLA_LINK])
658 return -EINVAL;
659
660 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
661 if (lowerdev == NULL)
662 return -ENODEV;
663
664 /* When creating macvlans on top of other macvlans - use
665 * the real device as the lowerdev.
666 */
667 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
668 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
669 lowerdev = lowervlan->lowerdev;
670 }
671
672 if (!tb[IFLA_MTU])
673 dev->mtu = lowerdev->mtu;
674 else if (dev->mtu > lowerdev->mtu)
675 return -EINVAL;
676
677 if (!tb[IFLA_ADDRESS])
678 random_ether_addr(dev->dev_addr);
679
680 if (!macvlan_port_exists(lowerdev)) {
681 err = macvlan_port_create(lowerdev);
682 if (err < 0)
683 return err;
684 }
685 port = macvlan_port_get(lowerdev);
686
687 /* Only 1 macvlan device can be created in passthru mode */
688 if (port->passthru)
689 return -EINVAL;
690
691 vlan->lowerdev = lowerdev;
692 vlan->dev = dev;
693 vlan->port = port;
694 vlan->receive = receive;
695 vlan->forward = forward;
696
697 vlan->mode = MACVLAN_MODE_VEPA;
698 if (data && data[IFLA_MACVLAN_MODE])
699 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
700
701 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
702 if (port->count)
703 return -EINVAL;
704 port->passthru = true;
705 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
706 }
707
708 port->count += 1;
709 err = register_netdevice(dev);
710 if (err < 0)
711 goto destroy_port;
712
713 list_add_tail(&vlan->list, &port->vlans);
714 netif_stacked_transfer_operstate(lowerdev, dev);
715
716 return 0;
717
718 destroy_port:
719 port->count -= 1;
720 if (!port->count)
721 macvlan_port_destroy(lowerdev);
722
723 return err;
724 }
725 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
726
727 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
728 struct nlattr *tb[], struct nlattr *data[])
729 {
730 return macvlan_common_newlink(src_net, dev, tb, data,
731 netif_rx,
732 dev_forward_skb);
733 }
734
735 void macvlan_dellink(struct net_device *dev, struct list_head *head)
736 {
737 struct macvlan_dev *vlan = netdev_priv(dev);
738
739 list_del(&vlan->list);
740 unregister_netdevice_queue(dev, head);
741 }
742 EXPORT_SYMBOL_GPL(macvlan_dellink);
743
744 static int macvlan_changelink(struct net_device *dev,
745 struct nlattr *tb[], struct nlattr *data[])
746 {
747 struct macvlan_dev *vlan = netdev_priv(dev);
748 if (data && data[IFLA_MACVLAN_MODE])
749 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
750 return 0;
751 }
752
753 static size_t macvlan_get_size(const struct net_device *dev)
754 {
755 return nla_total_size(4);
756 }
757
758 static int macvlan_fill_info(struct sk_buff *skb,
759 const struct net_device *dev)
760 {
761 struct macvlan_dev *vlan = netdev_priv(dev);
762
763 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
764 return 0;
765
766 nla_put_failure:
767 return -EMSGSIZE;
768 }
769
770 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
771 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
772 };
773
774 int macvlan_link_register(struct rtnl_link_ops *ops)
775 {
776 /* common fields */
777 ops->priv_size = sizeof(struct macvlan_dev);
778 ops->validate = macvlan_validate;
779 ops->maxtype = IFLA_MACVLAN_MAX;
780 ops->policy = macvlan_policy;
781 ops->changelink = macvlan_changelink;
782 ops->get_size = macvlan_get_size;
783 ops->fill_info = macvlan_fill_info;
784
785 return rtnl_link_register(ops);
786 };
787 EXPORT_SYMBOL_GPL(macvlan_link_register);
788
789 static struct rtnl_link_ops macvlan_link_ops = {
790 .kind = "macvlan",
791 .setup = macvlan_setup,
792 .newlink = macvlan_newlink,
793 .dellink = macvlan_dellink,
794 };
795
796 static int macvlan_device_event(struct notifier_block *unused,
797 unsigned long event, void *ptr)
798 {
799 struct net_device *dev = ptr;
800 struct macvlan_dev *vlan, *next;
801 struct macvlan_port *port;
802
803 if (!macvlan_port_exists(dev))
804 return NOTIFY_DONE;
805
806 port = macvlan_port_get(dev);
807
808 switch (event) {
809 case NETDEV_CHANGE:
810 list_for_each_entry(vlan, &port->vlans, list)
811 netif_stacked_transfer_operstate(vlan->lowerdev,
812 vlan->dev);
813 break;
814 case NETDEV_FEAT_CHANGE:
815 list_for_each_entry(vlan, &port->vlans, list) {
816 vlan->dev->features = dev->features & MACVLAN_FEATURES;
817 vlan->dev->gso_max_size = dev->gso_max_size;
818 netdev_features_change(vlan->dev);
819 }
820 break;
821 case NETDEV_UNREGISTER:
822 /* twiddle thumbs on netns device moves */
823 if (dev->reg_state != NETREG_UNREGISTERING)
824 break;
825
826 list_for_each_entry_safe(vlan, next, &port->vlans, list)
827 vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
828 break;
829 case NETDEV_PRE_TYPE_CHANGE:
830 /* Forbid underlaying device to change its type. */
831 return NOTIFY_BAD;
832 }
833 return NOTIFY_DONE;
834 }
835
836 static struct notifier_block macvlan_notifier_block __read_mostly = {
837 .notifier_call = macvlan_device_event,
838 };
839
840 static int __init macvlan_init_module(void)
841 {
842 int err;
843
844 register_netdevice_notifier(&macvlan_notifier_block);
845
846 err = macvlan_link_register(&macvlan_link_ops);
847 if (err < 0)
848 goto err1;
849 return 0;
850 err1:
851 unregister_netdevice_notifier(&macvlan_notifier_block);
852 return err;
853 }
854
855 static void __exit macvlan_cleanup_module(void)
856 {
857 rtnl_link_unregister(&macvlan_link_ops);
858 unregister_netdevice_notifier(&macvlan_notifier_block);
859 }
860
861 module_init(macvlan_init_module);
862 module_exit(macvlan_cleanup_module);
863
864 MODULE_LICENSE("GPL");
865 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
866 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
867 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux 2.6 libata-dev (mirror)