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tuntap: switch to use rtnl_dereference()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / macvlan.c
blob68a43fe602e7a89ccffa54d1a5b82e2da4e5330c
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 (ether_addr_equal_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 (ether_addr_equal_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 (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
122 skb->pkt_type = PACKET_BROADCAST;
123 else
124 skb->pkt_type = PACKET_MULTICAST;
125
126 return vlan->receive(skb);
127 }
128
129 static void macvlan_broadcast(struct sk_buff *skb,
130 const struct macvlan_port *port,
131 struct net_device *src,
132 enum macvlan_mode mode)
133 {
134 const struct ethhdr *eth = eth_hdr(skb);
135 const struct macvlan_dev *vlan;
136 struct hlist_node *n;
137 struct sk_buff *nskb;
138 unsigned int i;
139 int err;
140
141 if (skb->protocol == htons(ETH_P_PAUSE))
142 return;
143
144 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
145 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
146 if (vlan->dev == src || !(vlan->mode & mode))
147 continue;
148
149 nskb = skb_clone(skb, GFP_ATOMIC);
150 err = macvlan_broadcast_one(nskb, vlan, eth,
151 mode == MACVLAN_MODE_BRIDGE);
152 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
153 err == NET_RX_SUCCESS, 1);
154 }
155 }
156 }
157
158 /* called under rcu_read_lock() from netif_receive_skb */
159 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
160 {
161 struct macvlan_port *port;
162 struct sk_buff *skb = *pskb;
163 const struct ethhdr *eth = eth_hdr(skb);
164 const struct macvlan_dev *vlan;
165 const struct macvlan_dev *src;
166 struct net_device *dev;
167 unsigned int len = 0;
168 int ret = NET_RX_DROP;
169
170 port = macvlan_port_get_rcu(skb->dev);
171 if (is_multicast_ether_addr(eth->h_dest)) {
172 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
173 if (!skb)
174 return RX_HANDLER_CONSUMED;
175 eth = eth_hdr(skb);
176 src = macvlan_hash_lookup(port, eth->h_source);
177 if (!src)
178 /* frame comes from an external address */
179 macvlan_broadcast(skb, port, NULL,
180 MACVLAN_MODE_PRIVATE |
181 MACVLAN_MODE_VEPA |
182 MACVLAN_MODE_PASSTHRU|
183 MACVLAN_MODE_BRIDGE);
184 else if (src->mode == MACVLAN_MODE_VEPA)
185 /* flood to everyone except source */
186 macvlan_broadcast(skb, port, src->dev,
187 MACVLAN_MODE_VEPA |
188 MACVLAN_MODE_BRIDGE);
189 else if (src->mode == MACVLAN_MODE_BRIDGE)
190 /*
191 * flood only to VEPA ports, bridge ports
192 * already saw the frame on the way out.
193 */
194 macvlan_broadcast(skb, port, src->dev,
195 MACVLAN_MODE_VEPA);
196 else {
197 /* forward to original port. */
198 vlan = src;
199 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
200 goto out;
201 }
202
203 return RX_HANDLER_PASS;
204 }
205
206 if (port->passthru)
207 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
208 else
209 vlan = macvlan_hash_lookup(port, eth->h_dest);
210 if (vlan == NULL)
211 return RX_HANDLER_PASS;
212
213 dev = vlan->dev;
214 if (unlikely(!(dev->flags & IFF_UP))) {
215 kfree_skb(skb);
216 return RX_HANDLER_CONSUMED;
217 }
218 len = skb->len + ETH_HLEN;
219 skb = skb_share_check(skb, GFP_ATOMIC);
220 if (!skb)
221 goto out;
222
223 skb->dev = dev;
224 skb->pkt_type = PACKET_HOST;
225
226 ret = vlan->receive(skb);
227
228 out:
229 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
230 return RX_HANDLER_CONSUMED;
231 }
232
233 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
234 {
235 const struct macvlan_dev *vlan = netdev_priv(dev);
236 const struct macvlan_port *port = vlan->port;
237 const struct macvlan_dev *dest;
238 __u8 ip_summed = skb->ip_summed;
239
240 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
241 const struct ethhdr *eth = (void *)skb->data;
242 skb->ip_summed = CHECKSUM_UNNECESSARY;
243
244 /* send to other bridge ports directly */
245 if (is_multicast_ether_addr(eth->h_dest)) {
246 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
247 goto xmit_world;
248 }
249
250 dest = macvlan_hash_lookup(port, eth->h_dest);
251 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
252 /* send to lowerdev first for its network taps */
253 dev_forward_skb(vlan->lowerdev, skb);
254
255 return NET_XMIT_SUCCESS;
256 }
257 }
258
259 xmit_world:
260 skb->ip_summed = ip_summed;
261 skb->dev = vlan->lowerdev;
262 return dev_queue_xmit(skb);
263 }
264
265 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
266 struct net_device *dev)
267 {
268 unsigned int len = skb->len;
269 int ret;
270 const struct macvlan_dev *vlan = netdev_priv(dev);
271
272 ret = macvlan_queue_xmit(skb, dev);
273 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
274 struct macvlan_pcpu_stats *pcpu_stats;
275
276 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
277 u64_stats_update_begin(&pcpu_stats->syncp);
278 pcpu_stats->tx_packets++;
279 pcpu_stats->tx_bytes += len;
280 u64_stats_update_end(&pcpu_stats->syncp);
281 } else {
282 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
283 }
284 return ret;
285 }
286 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
287
288 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
289 unsigned short type, const void *daddr,
290 const void *saddr, unsigned len)
291 {
292 const struct macvlan_dev *vlan = netdev_priv(dev);
293 struct net_device *lowerdev = vlan->lowerdev;
294
295 return dev_hard_header(skb, lowerdev, type, daddr,
296 saddr ? : dev->dev_addr, len);
297 }
298
299 static const struct header_ops macvlan_hard_header_ops = {
300 .create = macvlan_hard_header,
301 .rebuild = eth_rebuild_header,
302 .parse = eth_header_parse,
303 .cache = eth_header_cache,
304 .cache_update = eth_header_cache_update,
305 };
306
307 static int macvlan_open(struct net_device *dev)
308 {
309 struct macvlan_dev *vlan = netdev_priv(dev);
310 struct net_device *lowerdev = vlan->lowerdev;
311 int err;
312
313 if (vlan->port->passthru) {
314 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
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 dev_uc_unsync(lowerdev, dev);
348 dev_mc_unsync(lowerdev, dev);
349
350 if (vlan->port->passthru) {
351 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
352 dev_set_promiscuity(lowerdev, -1);
353 goto hash_del;
354 }
355
356 if (dev->flags & IFF_ALLMULTI)
357 dev_set_allmulti(lowerdev, -1);
358
359 dev_uc_del(lowerdev, dev->dev_addr);
360
361 hash_del:
362 macvlan_hash_del(vlan, !dev->dismantle);
363 return 0;
364 }
365
366 static int macvlan_set_mac_address(struct net_device *dev, void *p)
367 {
368 struct macvlan_dev *vlan = netdev_priv(dev);
369 struct net_device *lowerdev = vlan->lowerdev;
370 struct sockaddr *addr = p;
371 int err;
372
373 if (!is_valid_ether_addr(addr->sa_data))
374 return -EADDRNOTAVAIL;
375
376 if (!(dev->flags & IFF_UP)) {
377 /* Just copy in the new address */
378 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
379 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
380 } else {
381 /* Rehash and update the device filters */
382 if (macvlan_addr_busy(vlan->port, addr->sa_data))
383 return -EBUSY;
384
385 err = dev_uc_add(lowerdev, addr->sa_data);
386 if (err)
387 return err;
388
389 dev_uc_del(lowerdev, dev->dev_addr);
390
391 macvlan_hash_change_addr(vlan, addr->sa_data);
392 }
393 return 0;
394 }
395
396 static void macvlan_change_rx_flags(struct net_device *dev, int change)
397 {
398 struct macvlan_dev *vlan = netdev_priv(dev);
399 struct net_device *lowerdev = vlan->lowerdev;
400
401 if (change & IFF_ALLMULTI)
402 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
403 }
404
405 static void macvlan_set_mac_lists(struct net_device *dev)
406 {
407 struct macvlan_dev *vlan = netdev_priv(dev);
408
409 dev_uc_sync(vlan->lowerdev, dev);
410 dev_mc_sync(vlan->lowerdev, dev);
411 }
412
413 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
414 {
415 struct macvlan_dev *vlan = netdev_priv(dev);
416
417 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
418 return -EINVAL;
419 dev->mtu = new_mtu;
420 return 0;
421 }
422
423 /*
424 * macvlan network devices have devices nesting below it and are a special
425 * "super class" of normal network devices; split their locks off into a
426 * separate class since they always nest.
427 */
428 static struct lock_class_key macvlan_netdev_xmit_lock_key;
429 static struct lock_class_key macvlan_netdev_addr_lock_key;
430
431 #define MACVLAN_FEATURES \
432 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
433 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
434 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
435 NETIF_F_HW_VLAN_FILTER)
436
437 #define MACVLAN_STATE_MASK \
438 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
439
440 static void macvlan_set_lockdep_class_one(struct net_device *dev,
441 struct netdev_queue *txq,
442 void *_unused)
443 {
444 lockdep_set_class(&txq->_xmit_lock,
445 &macvlan_netdev_xmit_lock_key);
446 }
447
448 static void macvlan_set_lockdep_class(struct net_device *dev)
449 {
450 lockdep_set_class(&dev->addr_list_lock,
451 &macvlan_netdev_addr_lock_key);
452 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
453 }
454
455 static int macvlan_init(struct net_device *dev)
456 {
457 struct macvlan_dev *vlan = netdev_priv(dev);
458 const struct net_device *lowerdev = vlan->lowerdev;
459
460 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
461 (lowerdev->state & MACVLAN_STATE_MASK);
462 dev->features = lowerdev->features & MACVLAN_FEATURES;
463 dev->features |= NETIF_F_LLTX;
464 dev->gso_max_size = lowerdev->gso_max_size;
465 dev->iflink = lowerdev->ifindex;
466 dev->hard_header_len = lowerdev->hard_header_len;
467
468 macvlan_set_lockdep_class(dev);
469
470 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
471 if (!vlan->pcpu_stats)
472 return -ENOMEM;
473
474 return 0;
475 }
476
477 static void macvlan_uninit(struct net_device *dev)
478 {
479 struct macvlan_dev *vlan = netdev_priv(dev);
480 struct macvlan_port *port = vlan->port;
481
482 free_percpu(vlan->pcpu_stats);
483
484 port->count -= 1;
485 if (!port->count)
486 macvlan_port_destroy(port->dev);
487 }
488
489 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
490 struct rtnl_link_stats64 *stats)
491 {
492 struct macvlan_dev *vlan = netdev_priv(dev);
493
494 if (vlan->pcpu_stats) {
495 struct macvlan_pcpu_stats *p;
496 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
497 u32 rx_errors = 0, tx_dropped = 0;
498 unsigned int start;
499 int i;
500
501 for_each_possible_cpu(i) {
502 p = per_cpu_ptr(vlan->pcpu_stats, i);
503 do {
504 start = u64_stats_fetch_begin_bh(&p->syncp);
505 rx_packets = p->rx_packets;
506 rx_bytes = p->rx_bytes;
507 rx_multicast = p->rx_multicast;
508 tx_packets = p->tx_packets;
509 tx_bytes = p->tx_bytes;
510 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
511
512 stats->rx_packets += rx_packets;
513 stats->rx_bytes += rx_bytes;
514 stats->multicast += rx_multicast;
515 stats->tx_packets += tx_packets;
516 stats->tx_bytes += tx_bytes;
517 /* rx_errors & tx_dropped are u32, updated
518 * without syncp protection.
519 */
520 rx_errors += p->rx_errors;
521 tx_dropped += p->tx_dropped;
522 }
523 stats->rx_errors = rx_errors;
524 stats->rx_dropped = rx_errors;
525 stats->tx_dropped = tx_dropped;
526 }
527 return stats;
528 }
529
530 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
531 unsigned short vid)
532 {
533 struct macvlan_dev *vlan = netdev_priv(dev);
534 struct net_device *lowerdev = vlan->lowerdev;
535
536 return vlan_vid_add(lowerdev, vid);
537 }
538
539 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
540 unsigned short vid)
541 {
542 struct macvlan_dev *vlan = netdev_priv(dev);
543 struct net_device *lowerdev = vlan->lowerdev;
544
545 vlan_vid_del(lowerdev, vid);
546 return 0;
547 }
548
549 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
550 struct net_device *dev,
551 const unsigned char *addr,
552 u16 flags)
553 {
554 struct macvlan_dev *vlan = netdev_priv(dev);
555 int err = -EINVAL;
556
557 if (!vlan->port->passthru)
558 return -EOPNOTSUPP;
559
560 if (is_unicast_ether_addr(addr))
561 err = dev_uc_add_excl(dev, addr);
562 else if (is_multicast_ether_addr(addr))
563 err = dev_mc_add_excl(dev, addr);
564
565 return err;
566 }
567
568 static int macvlan_fdb_del(struct ndmsg *ndm,
569 struct net_device *dev,
570 const unsigned char *addr)
571 {
572 struct macvlan_dev *vlan = netdev_priv(dev);
573 int err = -EINVAL;
574
575 if (!vlan->port->passthru)
576 return -EOPNOTSUPP;
577
578 if (is_unicast_ether_addr(addr))
579 err = dev_uc_del(dev, addr);
580 else if (is_multicast_ether_addr(addr))
581 err = dev_mc_del(dev, addr);
582
583 return err;
584 }
585
586 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
587 struct ethtool_drvinfo *drvinfo)
588 {
589 snprintf(drvinfo->driver, 32, "macvlan");
590 snprintf(drvinfo->version, 32, "0.1");
591 }
592
593 static int macvlan_ethtool_get_settings(struct net_device *dev,
594 struct ethtool_cmd *cmd)
595 {
596 const struct macvlan_dev *vlan = netdev_priv(dev);
597
598 return __ethtool_get_settings(vlan->lowerdev, cmd);
599 }
600
601 static const struct ethtool_ops macvlan_ethtool_ops = {
602 .get_link = ethtool_op_get_link,
603 .get_settings = macvlan_ethtool_get_settings,
604 .get_drvinfo = macvlan_ethtool_get_drvinfo,
605 };
606
607 static const struct net_device_ops macvlan_netdev_ops = {
608 .ndo_init = macvlan_init,
609 .ndo_uninit = macvlan_uninit,
610 .ndo_open = macvlan_open,
611 .ndo_stop = macvlan_stop,
612 .ndo_start_xmit = macvlan_start_xmit,
613 .ndo_change_mtu = macvlan_change_mtu,
614 .ndo_change_rx_flags = macvlan_change_rx_flags,
615 .ndo_set_mac_address = macvlan_set_mac_address,
616 .ndo_set_rx_mode = macvlan_set_mac_lists,
617 .ndo_get_stats64 = macvlan_dev_get_stats64,
618 .ndo_validate_addr = eth_validate_addr,
619 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
620 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
621 .ndo_fdb_add = macvlan_fdb_add,
622 .ndo_fdb_del = macvlan_fdb_del,
623 .ndo_fdb_dump = ndo_dflt_fdb_dump,
624 };
625
626 void macvlan_common_setup(struct net_device *dev)
627 {
628 ether_setup(dev);
629
630 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
631 dev->netdev_ops = &macvlan_netdev_ops;
632 dev->destructor = free_netdev;
633 dev->header_ops = &macvlan_hard_header_ops,
634 dev->ethtool_ops = &macvlan_ethtool_ops;
635 }
636 EXPORT_SYMBOL_GPL(macvlan_common_setup);
637
638 static void macvlan_setup(struct net_device *dev)
639 {
640 macvlan_common_setup(dev);
641 dev->tx_queue_len = 0;
642 }
643
644 static int macvlan_port_create(struct net_device *dev)
645 {
646 struct macvlan_port *port;
647 unsigned int i;
648 int err;
649
650 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
651 return -EINVAL;
652
653 port = kzalloc(sizeof(*port), GFP_KERNEL);
654 if (port == NULL)
655 return -ENOMEM;
656
657 port->passthru = false;
658 port->dev = dev;
659 INIT_LIST_HEAD(&port->vlans);
660 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
661 INIT_HLIST_HEAD(&port->vlan_hash[i]);
662
663 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
664 if (err)
665 kfree(port);
666 else
667 dev->priv_flags |= IFF_MACVLAN_PORT;
668 return err;
669 }
670
671 static void macvlan_port_destroy(struct net_device *dev)
672 {
673 struct macvlan_port *port = macvlan_port_get(dev);
674
675 dev->priv_flags &= ~IFF_MACVLAN_PORT;
676 netdev_rx_handler_unregister(dev);
677 kfree_rcu(port, rcu);
678 }
679
680 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
681 {
682 if (tb[IFLA_ADDRESS]) {
683 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
684 return -EINVAL;
685 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
686 return -EADDRNOTAVAIL;
687 }
688
689 if (data && data[IFLA_MACVLAN_MODE]) {
690 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
691 case MACVLAN_MODE_PRIVATE:
692 case MACVLAN_MODE_VEPA:
693 case MACVLAN_MODE_BRIDGE:
694 case MACVLAN_MODE_PASSTHRU:
695 break;
696 default:
697 return -EINVAL;
698 }
699 }
700 return 0;
701 }
702
703 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
704 struct nlattr *tb[], struct nlattr *data[],
705 int (*receive)(struct sk_buff *skb),
706 int (*forward)(struct net_device *dev,
707 struct sk_buff *skb))
708 {
709 struct macvlan_dev *vlan = netdev_priv(dev);
710 struct macvlan_port *port;
711 struct net_device *lowerdev;
712 int err;
713
714 if (!tb[IFLA_LINK])
715 return -EINVAL;
716
717 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
718 if (lowerdev == NULL)
719 return -ENODEV;
720
721 /* When creating macvlans on top of other macvlans - use
722 * the real device as the lowerdev.
723 */
724 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
725 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
726 lowerdev = lowervlan->lowerdev;
727 }
728
729 if (!tb[IFLA_MTU])
730 dev->mtu = lowerdev->mtu;
731 else if (dev->mtu > lowerdev->mtu)
732 return -EINVAL;
733
734 if (!tb[IFLA_ADDRESS])
735 eth_hw_addr_random(dev);
736
737 if (!macvlan_port_exists(lowerdev)) {
738 err = macvlan_port_create(lowerdev);
739 if (err < 0)
740 return err;
741 }
742 port = macvlan_port_get(lowerdev);
743
744 /* Only 1 macvlan device can be created in passthru mode */
745 if (port->passthru)
746 return -EINVAL;
747
748 vlan->lowerdev = lowerdev;
749 vlan->dev = dev;
750 vlan->port = port;
751 vlan->receive = receive;
752 vlan->forward = forward;
753
754 vlan->mode = MACVLAN_MODE_VEPA;
755 if (data && data[IFLA_MACVLAN_MODE])
756 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
757
758 if (data && data[IFLA_MACVLAN_FLAGS])
759 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
760
761 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
762 if (port->count)
763 return -EINVAL;
764 port->passthru = true;
765 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
766 }
767
768 port->count += 1;
769 err = register_netdevice(dev);
770 if (err < 0)
771 goto destroy_port;
772
773 list_add_tail(&vlan->list, &port->vlans);
774 netif_stacked_transfer_operstate(lowerdev, dev);
775
776 return 0;
777
778 destroy_port:
779 port->count -= 1;
780 if (!port->count)
781 macvlan_port_destroy(lowerdev);
782
783 return err;
784 }
785 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
786
787 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
788 struct nlattr *tb[], struct nlattr *data[])
789 {
790 return macvlan_common_newlink(src_net, dev, tb, data,
791 netif_rx,
792 dev_forward_skb);
793 }
794
795 void macvlan_dellink(struct net_device *dev, struct list_head *head)
796 {
797 struct macvlan_dev *vlan = netdev_priv(dev);
798
799 list_del(&vlan->list);
800 unregister_netdevice_queue(dev, head);
801 }
802 EXPORT_SYMBOL_GPL(macvlan_dellink);
803
804 static int macvlan_changelink(struct net_device *dev,
805 struct nlattr *tb[], struct nlattr *data[])
806 {
807 struct macvlan_dev *vlan = netdev_priv(dev);
808 if (data && data[IFLA_MACVLAN_MODE])
809 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
810 if (data && data[IFLA_MACVLAN_FLAGS]) {
811 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
812 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
813
814 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
815 dev_set_promiscuity(vlan->lowerdev, -1);
816 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
817 dev_set_promiscuity(vlan->lowerdev, 1);
818 vlan->flags = flags;
819 }
820 return 0;
821 }
822
823 static size_t macvlan_get_size(const struct net_device *dev)
824 {
825 return nla_total_size(4);
826 }
827
828 static int macvlan_fill_info(struct sk_buff *skb,
829 const struct net_device *dev)
830 {
831 struct macvlan_dev *vlan = netdev_priv(dev);
832
833 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
834 goto nla_put_failure;
835 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
836 goto nla_put_failure;
837 return 0;
838
839 nla_put_failure:
840 return -EMSGSIZE;
841 }
842
843 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
844 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
845 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
846 };
847
848 int macvlan_link_register(struct rtnl_link_ops *ops)
849 {
850 /* common fields */
851 ops->priv_size = sizeof(struct macvlan_dev);
852 ops->validate = macvlan_validate;
853 ops->maxtype = IFLA_MACVLAN_MAX;
854 ops->policy = macvlan_policy;
855 ops->changelink = macvlan_changelink;
856 ops->get_size = macvlan_get_size;
857 ops->fill_info = macvlan_fill_info;
858
859 return rtnl_link_register(ops);
860 };
861 EXPORT_SYMBOL_GPL(macvlan_link_register);
862
863 static struct rtnl_link_ops macvlan_link_ops = {
864 .kind = "macvlan",
865 .setup = macvlan_setup,
866 .newlink = macvlan_newlink,
867 .dellink = macvlan_dellink,
868 };
869
870 static int macvlan_device_event(struct notifier_block *unused,
871 unsigned long event, void *ptr)
872 {
873 struct net_device *dev = ptr;
874 struct macvlan_dev *vlan, *next;
875 struct macvlan_port *port;
876 LIST_HEAD(list_kill);
877
878 if (!macvlan_port_exists(dev))
879 return NOTIFY_DONE;
880
881 port = macvlan_port_get(dev);
882
883 switch (event) {
884 case NETDEV_CHANGE:
885 list_for_each_entry(vlan, &port->vlans, list)
886 netif_stacked_transfer_operstate(vlan->lowerdev,
887 vlan->dev);
888 break;
889 case NETDEV_FEAT_CHANGE:
890 list_for_each_entry(vlan, &port->vlans, list) {
891 vlan->dev->features = dev->features & MACVLAN_FEATURES;
892 vlan->dev->gso_max_size = dev->gso_max_size;
893 netdev_features_change(vlan->dev);
894 }
895 break;
896 case NETDEV_UNREGISTER:
897 /* twiddle thumbs on netns device moves */
898 if (dev->reg_state != NETREG_UNREGISTERING)
899 break;
900
901 list_for_each_entry_safe(vlan, next, &port->vlans, list)
902 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
903 unregister_netdevice_many(&list_kill);
904 list_del(&list_kill);
905 break;
906 case NETDEV_PRE_TYPE_CHANGE:
907 /* Forbid underlaying device to change its type. */
908 return NOTIFY_BAD;
909 }
910 return NOTIFY_DONE;
911 }
912
913 static struct notifier_block macvlan_notifier_block __read_mostly = {
914 .notifier_call = macvlan_device_event,
915 };
916
917 static int __init macvlan_init_module(void)
918 {
919 int err;
920
921 register_netdevice_notifier(&macvlan_notifier_block);
922
923 err = macvlan_link_register(&macvlan_link_ops);
924 if (err < 0)
925 goto err1;
926 return 0;
927 err1:
928 unregister_netdevice_notifier(&macvlan_notifier_block);
929 return err;
930 }
931
932 static void __exit macvlan_cleanup_module(void)
933 {
934 rtnl_link_unregister(&macvlan_link_ops);
935 unregister_netdevice_notifier(&macvlan_notifier_block);
936 }
937
938 module_init(macvlan_init_module);
939 module_exit(macvlan_cleanup_module);
940
941 MODULE_LICENSE("GPL");
942 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
943 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
944 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree