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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / drivers / net / macvlan.c
blobf5824afedb70b84476ce078fa50a1614a6d4ee5f
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
33 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
34
35 struct macvlan_port {
36 struct net_device *dev;
37 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
38 struct list_head vlans;
39 };
40
41 struct macvlan_dev {
42 struct net_device *dev;
43 struct list_head list;
44 struct hlist_node hlist;
45 struct macvlan_port *port;
46 struct net_device *lowerdev;
47 };
48
49
50 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
51 const unsigned char *addr)
52 {
53 struct macvlan_dev *vlan;
54 struct hlist_node *n;
55
56 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
57 if (!compare_ether_addr(vlan->dev->dev_addr, addr))
58 return vlan;
59 }
60 return NULL;
61 }
62
63 static void macvlan_broadcast(struct sk_buff *skb,
64 const struct macvlan_port *port)
65 {
66 const struct ethhdr *eth = eth_hdr(skb);
67 const struct macvlan_dev *vlan;
68 struct hlist_node *n;
69 struct net_device *dev;
70 struct sk_buff *nskb;
71 unsigned int i;
72
73 if (skb->protocol == htons(ETH_P_PAUSE))
74 return;
75
76 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
77 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
78 dev = vlan->dev;
79
80 nskb = skb_clone(skb, GFP_ATOMIC);
81 if (nskb == NULL) {
82 dev->stats.rx_errors++;
83 dev->stats.rx_dropped++;
84 continue;
85 }
86
87 dev->stats.rx_bytes += skb->len + ETH_HLEN;
88 dev->stats.rx_packets++;
89 dev->stats.multicast++;
90
91 nskb->dev = dev;
92 if (!compare_ether_addr(eth->h_dest, dev->broadcast))
93 nskb->pkt_type = PACKET_BROADCAST;
94 else
95 nskb->pkt_type = PACKET_MULTICAST;
96
97 netif_rx(nskb);
98 }
99 }
100 }
101
102 /* called under rcu_read_lock() from netif_receive_skb */
103 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
104 {
105 const struct ethhdr *eth = eth_hdr(skb);
106 const struct macvlan_port *port;
107 const struct macvlan_dev *vlan;
108 struct net_device *dev;
109
110 port = rcu_dereference(skb->dev->macvlan_port);
111 if (port == NULL)
112 return skb;
113
114 if (is_multicast_ether_addr(eth->h_dest)) {
115 macvlan_broadcast(skb, port);
116 return skb;
117 }
118
119 vlan = macvlan_hash_lookup(port, eth->h_dest);
120 if (vlan == NULL)
121 return skb;
122
123 dev = vlan->dev;
124 if (unlikely(!(dev->flags & IFF_UP))) {
125 kfree_skb(skb);
126 return NULL;
127 }
128
129 skb = skb_share_check(skb, GFP_ATOMIC);
130 if (skb == NULL) {
131 dev->stats.rx_errors++;
132 dev->stats.rx_dropped++;
133 return NULL;
134 }
135
136 dev->stats.rx_bytes += skb->len + ETH_HLEN;
137 dev->stats.rx_packets++;
138
139 skb->dev = dev;
140 skb->pkt_type = PACKET_HOST;
141
142 netif_rx(skb);
143 return NULL;
144 }
145
146 static int macvlan_start_xmit(struct sk_buff *skb, struct net_device *dev)
147 {
148 const struct macvlan_dev *vlan = netdev_priv(dev);
149 unsigned int len = skb->len;
150 int ret;
151
152 skb->dev = vlan->lowerdev;
153 ret = dev_queue_xmit(skb);
154
155 if (likely(ret == NET_XMIT_SUCCESS)) {
156 dev->stats.tx_packets++;
157 dev->stats.tx_bytes += len;
158 } else {
159 dev->stats.tx_errors++;
160 dev->stats.tx_aborted_errors++;
161 }
162 return NETDEV_TX_OK;
163 }
164
165 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
166 unsigned short type, const void *daddr,
167 const void *saddr, unsigned len)
168 {
169 const struct macvlan_dev *vlan = netdev_priv(dev);
170 struct net_device *lowerdev = vlan->lowerdev;
171
172 return dev_hard_header(skb, lowerdev, type, daddr,
173 saddr ? : dev->dev_addr, len);
174 }
175
176 static const struct header_ops macvlan_hard_header_ops = {
177 .create = macvlan_hard_header,
178 .rebuild = eth_rebuild_header,
179 .parse = eth_header_parse,
180 .cache = eth_header_cache,
181 .cache_update = eth_header_cache_update,
182 };
183
184 static int macvlan_open(struct net_device *dev)
185 {
186 struct macvlan_dev *vlan = netdev_priv(dev);
187 struct macvlan_port *port = vlan->port;
188 struct net_device *lowerdev = vlan->lowerdev;
189 int err;
190
191 err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN);
192 if (err < 0)
193 goto out;
194 if (dev->flags & IFF_ALLMULTI) {
195 err = dev_set_allmulti(lowerdev, 1);
196 if (err < 0)
197 goto del_unicast;
198 }
199
200 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
201 return 0;
202
203 del_unicast:
204 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
205 out:
206 return err;
207 }
208
209 static int macvlan_stop(struct net_device *dev)
210 {
211 struct macvlan_dev *vlan = netdev_priv(dev);
212 struct net_device *lowerdev = vlan->lowerdev;
213
214 dev_mc_unsync(lowerdev, dev);
215 if (dev->flags & IFF_ALLMULTI)
216 dev_set_allmulti(lowerdev, -1);
217
218 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
219
220 hlist_del_rcu(&vlan->hlist);
221 synchronize_rcu();
222 return 0;
223 }
224
225 static int macvlan_set_mac_address(struct net_device *dev, void *p)
226 {
227 struct macvlan_dev *vlan = netdev_priv(dev);
228 struct net_device *lowerdev = vlan->lowerdev;
229 struct sockaddr *addr = p;
230 int err;
231
232 if (!is_valid_ether_addr(addr->sa_data))
233 return -EADDRNOTAVAIL;
234
235 if (!(dev->flags & IFF_UP))
236 goto out;
237
238 err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN);
239 if (err < 0)
240 return err;
241 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
242
243 out:
244 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
245 return 0;
246 }
247
248 static void macvlan_change_rx_flags(struct net_device *dev, int change)
249 {
250 struct macvlan_dev *vlan = netdev_priv(dev);
251 struct net_device *lowerdev = vlan->lowerdev;
252
253 if (change & IFF_ALLMULTI)
254 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
255 }
256
257 static void macvlan_set_multicast_list(struct net_device *dev)
258 {
259 struct macvlan_dev *vlan = netdev_priv(dev);
260
261 dev_mc_sync(vlan->lowerdev, dev);
262 }
263
264 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
265 {
266 struct macvlan_dev *vlan = netdev_priv(dev);
267
268 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
269 return -EINVAL;
270 dev->mtu = new_mtu;
271 return 0;
272 }
273
274 /*
275 * macvlan network devices have devices nesting below it and are a special
276 * "super class" of normal network devices; split their locks off into a
277 * separate class since they always nest.
278 */
279 static struct lock_class_key macvlan_netdev_xmit_lock_key;
280 static struct lock_class_key macvlan_netdev_addr_lock_key;
281
282 #define MACVLAN_FEATURES \
283 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
284 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
285 NETIF_F_TSO_ECN | NETIF_F_TSO6)
286
287 #define MACVLAN_STATE_MASK \
288 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
289
290 static void macvlan_set_lockdep_class_one(struct net_device *dev,
291 struct netdev_queue *txq,
292 void *_unused)
293 {
294 lockdep_set_class(&txq->_xmit_lock,
295 &macvlan_netdev_xmit_lock_key);
296 }
297
298 static void macvlan_set_lockdep_class(struct net_device *dev)
299 {
300 lockdep_set_class(&dev->addr_list_lock,
301 &macvlan_netdev_addr_lock_key);
302 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
303 }
304
305 static int macvlan_init(struct net_device *dev)
306 {
307 struct macvlan_dev *vlan = netdev_priv(dev);
308 const struct net_device *lowerdev = vlan->lowerdev;
309
310 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
311 (lowerdev->state & MACVLAN_STATE_MASK);
312 dev->features = lowerdev->features & MACVLAN_FEATURES;
313 dev->iflink = lowerdev->ifindex;
314
315 macvlan_set_lockdep_class(dev);
316
317 return 0;
318 }
319
320 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
321 struct ethtool_drvinfo *drvinfo)
322 {
323 snprintf(drvinfo->driver, 32, "macvlan");
324 snprintf(drvinfo->version, 32, "0.1");
325 }
326
327 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
328 {
329 const struct macvlan_dev *vlan = netdev_priv(dev);
330 struct net_device *lowerdev = vlan->lowerdev;
331
332 if (lowerdev->ethtool_ops == NULL ||
333 lowerdev->ethtool_ops->get_rx_csum == NULL)
334 return 0;
335 return lowerdev->ethtool_ops->get_rx_csum(lowerdev);
336 }
337
338 static int macvlan_ethtool_get_settings(struct net_device *dev,
339 struct ethtool_cmd *cmd)
340 {
341 const struct macvlan_dev *vlan = netdev_priv(dev);
342 struct net_device *lowerdev = vlan->lowerdev;
343
344 if (!lowerdev->ethtool_ops ||
345 !lowerdev->ethtool_ops->get_settings)
346 return -EOPNOTSUPP;
347
348 return lowerdev->ethtool_ops->get_settings(lowerdev, cmd);
349 }
350
351 static u32 macvlan_ethtool_get_flags(struct net_device *dev)
352 {
353 const struct macvlan_dev *vlan = netdev_priv(dev);
354 struct net_device *lowerdev = vlan->lowerdev;
355
356 if (!lowerdev->ethtool_ops ||
357 !lowerdev->ethtool_ops->get_flags)
358 return 0;
359 return lowerdev->ethtool_ops->get_flags(lowerdev);
360 }
361
362 static const struct ethtool_ops macvlan_ethtool_ops = {
363 .get_link = ethtool_op_get_link,
364 .get_settings = macvlan_ethtool_get_settings,
365 .get_rx_csum = macvlan_ethtool_get_rx_csum,
366 .get_drvinfo = macvlan_ethtool_get_drvinfo,
367 .get_flags = macvlan_ethtool_get_flags,
368 };
369
370 static const struct net_device_ops macvlan_netdev_ops = {
371 .ndo_init = macvlan_init,
372 .ndo_open = macvlan_open,
373 .ndo_stop = macvlan_stop,
374 .ndo_start_xmit = macvlan_start_xmit,
375 .ndo_change_mtu = macvlan_change_mtu,
376 .ndo_change_rx_flags = macvlan_change_rx_flags,
377 .ndo_set_mac_address = macvlan_set_mac_address,
378 .ndo_set_multicast_list = macvlan_set_multicast_list,
379 .ndo_validate_addr = eth_validate_addr,
380 };
381
382 static void macvlan_setup(struct net_device *dev)
383 {
384 ether_setup(dev);
385
386 dev->netdev_ops = &macvlan_netdev_ops;
387 dev->destructor = free_netdev;
388 dev->header_ops = &macvlan_hard_header_ops,
389 dev->ethtool_ops = &macvlan_ethtool_ops;
390 dev->tx_queue_len = 0;
391 }
392
393 static int macvlan_port_create(struct net_device *dev)
394 {
395 struct macvlan_port *port;
396 unsigned int i;
397
398 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
399 return -EINVAL;
400
401 port = kzalloc(sizeof(*port), GFP_KERNEL);
402 if (port == NULL)
403 return -ENOMEM;
404
405 port->dev = dev;
406 INIT_LIST_HEAD(&port->vlans);
407 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
408 INIT_HLIST_HEAD(&port->vlan_hash[i]);
409 rcu_assign_pointer(dev->macvlan_port, port);
410 return 0;
411 }
412
413 static void macvlan_port_destroy(struct net_device *dev)
414 {
415 struct macvlan_port *port = dev->macvlan_port;
416
417 rcu_assign_pointer(dev->macvlan_port, NULL);
418 synchronize_rcu();
419 kfree(port);
420 }
421
422 static void macvlan_transfer_operstate(struct net_device *dev)
423 {
424 struct macvlan_dev *vlan = netdev_priv(dev);
425 const struct net_device *lowerdev = vlan->lowerdev;
426
427 if (lowerdev->operstate == IF_OPER_DORMANT)
428 netif_dormant_on(dev);
429 else
430 netif_dormant_off(dev);
431
432 if (netif_carrier_ok(lowerdev)) {
433 if (!netif_carrier_ok(dev))
434 netif_carrier_on(dev);
435 } else {
436 if (netif_carrier_ok(dev))
437 netif_carrier_off(dev);
438 }
439 }
440
441 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
442 {
443 if (tb[IFLA_ADDRESS]) {
444 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
445 return -EINVAL;
446 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
447 return -EADDRNOTAVAIL;
448 }
449 return 0;
450 }
451
452 static int macvlan_newlink(struct net_device *dev,
453 struct nlattr *tb[], struct nlattr *data[])
454 {
455 struct macvlan_dev *vlan = netdev_priv(dev);
456 struct macvlan_port *port;
457 struct net_device *lowerdev;
458 int err;
459
460 if (!tb[IFLA_LINK])
461 return -EINVAL;
462
463 lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
464 if (lowerdev == NULL)
465 return -ENODEV;
466
467 /* Don't allow macvlans on top of other macvlans - its not really
468 * wrong, but lockdep can't handle it and its not useful for anything
469 * you couldn't do directly on top of the real device.
470 */
471 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops)
472 return -ENODEV;
473
474 if (!tb[IFLA_MTU])
475 dev->mtu = lowerdev->mtu;
476 else if (dev->mtu > lowerdev->mtu)
477 return -EINVAL;
478
479 if (!tb[IFLA_ADDRESS])
480 random_ether_addr(dev->dev_addr);
481
482 if (lowerdev->macvlan_port == NULL) {
483 err = macvlan_port_create(lowerdev);
484 if (err < 0)
485 return err;
486 }
487 port = lowerdev->macvlan_port;
488
489 vlan->lowerdev = lowerdev;
490 vlan->dev = dev;
491 vlan->port = port;
492
493 err = register_netdevice(dev);
494 if (err < 0)
495 return err;
496
497 list_add_tail(&vlan->list, &port->vlans);
498 macvlan_transfer_operstate(dev);
499 return 0;
500 }
501
502 static void macvlan_dellink(struct net_device *dev)
503 {
504 struct macvlan_dev *vlan = netdev_priv(dev);
505 struct macvlan_port *port = vlan->port;
506
507 list_del(&vlan->list);
508 unregister_netdevice(dev);
509
510 if (list_empty(&port->vlans))
511 macvlan_port_destroy(port->dev);
512 }
513
514 static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
515 .kind = "macvlan",
516 .priv_size = sizeof(struct macvlan_dev),
517 .setup = macvlan_setup,
518 .validate = macvlan_validate,
519 .newlink = macvlan_newlink,
520 .dellink = macvlan_dellink,
521 };
522
523 static int macvlan_device_event(struct notifier_block *unused,
524 unsigned long event, void *ptr)
525 {
526 struct net_device *dev = ptr;
527 struct macvlan_dev *vlan, *next;
528 struct macvlan_port *port;
529
530 port = dev->macvlan_port;
531 if (port == NULL)
532 return NOTIFY_DONE;
533
534 switch (event) {
535 case NETDEV_CHANGE:
536 list_for_each_entry(vlan, &port->vlans, list)
537 macvlan_transfer_operstate(vlan->dev);
538 break;
539 case NETDEV_FEAT_CHANGE:
540 list_for_each_entry(vlan, &port->vlans, list) {
541 vlan->dev->features = dev->features & MACVLAN_FEATURES;
542 netdev_features_change(vlan->dev);
543 }
544 break;
545 case NETDEV_UNREGISTER:
546 list_for_each_entry_safe(vlan, next, &port->vlans, list)
547 macvlan_dellink(vlan->dev);
548 break;
549 }
550 return NOTIFY_DONE;
551 }
552
553 static struct notifier_block macvlan_notifier_block __read_mostly = {
554 .notifier_call = macvlan_device_event,
555 };
556
557 static int __init macvlan_init_module(void)
558 {
559 int err;
560
561 register_netdevice_notifier(&macvlan_notifier_block);
562 macvlan_handle_frame_hook = macvlan_handle_frame;
563
564 err = rtnl_link_register(&macvlan_link_ops);
565 if (err < 0)
566 goto err1;
567 return 0;
568 err1:
569 macvlan_handle_frame_hook = NULL;
570 unregister_netdevice_notifier(&macvlan_notifier_block);
571 return err;
572 }
573
574 static void __exit macvlan_cleanup_module(void)
575 {
576 rtnl_link_unregister(&macvlan_link_ops);
577 macvlan_handle_frame_hook = NULL;
578 unregister_netdevice_notifier(&macvlan_notifier_block);
579 }
580
581 module_init(macvlan_init_module);
582 module_exit(macvlan_cleanup_module);
583
584 MODULE_LICENSE("GPL");
585 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
586 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
587 MODULE_ALIAS_RTNL_LINK("macvlan");
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