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b863ceb7 PM |
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> | |
82524746 | 23 | #include <linux/rculist.h> |
b863ceb7 PM |
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 | ||
f9ac30f0 EB |
63 | static void macvlan_hash_add(struct macvlan_dev *vlan) |
64 | { | |
65 | struct macvlan_port *port = vlan->port; | |
66 | const unsigned char *addr = vlan->dev->dev_addr; | |
67 | ||
68 | hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); | |
69 | } | |
70 | ||
71 | static void macvlan_hash_del(struct macvlan_dev *vlan) | |
72 | { | |
73 | hlist_del_rcu(&vlan->hlist); | |
74 | synchronize_rcu(); | |
75 | } | |
76 | ||
77 | static void macvlan_hash_change_addr(struct macvlan_dev *vlan, | |
78 | const unsigned char *addr) | |
79 | { | |
80 | macvlan_hash_del(vlan); | |
81 | /* Now that we are unhashed it is safe to change the device | |
82 | * address without confusing packet delivery. | |
83 | */ | |
84 | memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); | |
85 | macvlan_hash_add(vlan); | |
86 | } | |
87 | ||
88 | static int macvlan_addr_busy(const struct macvlan_port *port, | |
89 | const unsigned char *addr) | |
90 | { | |
91 | /* Test to see if the specified multicast address is | |
92 | * currently in use by the underlying device or | |
93 | * another macvlan. | |
94 | */ | |
95 | if (memcmp(port->dev->dev_addr, addr, ETH_ALEN) == 0) | |
96 | return 1; | |
97 | ||
98 | if (macvlan_hash_lookup(port, addr)) | |
99 | return 1; | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
b863ceb7 PM |
104 | static void macvlan_broadcast(struct sk_buff *skb, |
105 | const struct macvlan_port *port) | |
106 | { | |
107 | const struct ethhdr *eth = eth_hdr(skb); | |
108 | const struct macvlan_dev *vlan; | |
109 | struct hlist_node *n; | |
110 | struct net_device *dev; | |
111 | struct sk_buff *nskb; | |
112 | unsigned int i; | |
113 | ||
efbbced3 PM |
114 | if (skb->protocol == htons(ETH_P_PAUSE)) |
115 | return; | |
116 | ||
b863ceb7 PM |
117 | for (i = 0; i < MACVLAN_HASH_SIZE; i++) { |
118 | hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { | |
119 | dev = vlan->dev; | |
b863ceb7 PM |
120 | |
121 | nskb = skb_clone(skb, GFP_ATOMIC); | |
122 | if (nskb == NULL) { | |
123 | dev->stats.rx_errors++; | |
124 | dev->stats.rx_dropped++; | |
125 | continue; | |
126 | } | |
127 | ||
128 | dev->stats.rx_bytes += skb->len + ETH_HLEN; | |
129 | dev->stats.rx_packets++; | |
130 | dev->stats.multicast++; | |
b863ceb7 PM |
131 | |
132 | nskb->dev = dev; | |
133 | if (!compare_ether_addr(eth->h_dest, dev->broadcast)) | |
134 | nskb->pkt_type = PACKET_BROADCAST; | |
135 | else | |
136 | nskb->pkt_type = PACKET_MULTICAST; | |
137 | ||
138 | netif_rx(nskb); | |
139 | } | |
140 | } | |
141 | } | |
142 | ||
143 | /* called under rcu_read_lock() from netif_receive_skb */ | |
144 | static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb) | |
145 | { | |
146 | const struct ethhdr *eth = eth_hdr(skb); | |
147 | const struct macvlan_port *port; | |
148 | const struct macvlan_dev *vlan; | |
149 | struct net_device *dev; | |
150 | ||
151 | port = rcu_dereference(skb->dev->macvlan_port); | |
152 | if (port == NULL) | |
153 | return skb; | |
154 | ||
155 | if (is_multicast_ether_addr(eth->h_dest)) { | |
156 | macvlan_broadcast(skb, port); | |
157 | return skb; | |
158 | } | |
159 | ||
160 | vlan = macvlan_hash_lookup(port, eth->h_dest); | |
161 | if (vlan == NULL) | |
162 | return skb; | |
163 | ||
164 | dev = vlan->dev; | |
165 | if (unlikely(!(dev->flags & IFF_UP))) { | |
166 | kfree_skb(skb); | |
167 | return NULL; | |
168 | } | |
169 | ||
170 | skb = skb_share_check(skb, GFP_ATOMIC); | |
171 | if (skb == NULL) { | |
172 | dev->stats.rx_errors++; | |
173 | dev->stats.rx_dropped++; | |
174 | return NULL; | |
175 | } | |
176 | ||
177 | dev->stats.rx_bytes += skb->len + ETH_HLEN; | |
178 | dev->stats.rx_packets++; | |
b863ceb7 PM |
179 | |
180 | skb->dev = dev; | |
181 | skb->pkt_type = PACKET_HOST; | |
182 | ||
183 | netif_rx(skb); | |
184 | return NULL; | |
185 | } | |
186 | ||
00829823 | 187 | static int macvlan_start_xmit(struct sk_buff *skb, struct net_device *dev) |
b863ceb7 PM |
188 | { |
189 | const struct macvlan_dev *vlan = netdev_priv(dev); | |
190 | unsigned int len = skb->len; | |
191 | int ret; | |
192 | ||
193 | skb->dev = vlan->lowerdev; | |
194 | ret = dev_queue_xmit(skb); | |
195 | ||
196 | if (likely(ret == NET_XMIT_SUCCESS)) { | |
197 | dev->stats.tx_packets++; | |
198 | dev->stats.tx_bytes += len; | |
199 | } else { | |
200 | dev->stats.tx_errors++; | |
201 | dev->stats.tx_aborted_errors++; | |
202 | } | |
203 | return NETDEV_TX_OK; | |
204 | } | |
205 | ||
206 | static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, | |
3b04ddde SH |
207 | unsigned short type, const void *daddr, |
208 | const void *saddr, unsigned len) | |
b863ceb7 PM |
209 | { |
210 | const struct macvlan_dev *vlan = netdev_priv(dev); | |
211 | struct net_device *lowerdev = vlan->lowerdev; | |
212 | ||
0c4e8581 SH |
213 | return dev_hard_header(skb, lowerdev, type, daddr, |
214 | saddr ? : dev->dev_addr, len); | |
b863ceb7 PM |
215 | } |
216 | ||
3b04ddde SH |
217 | static const struct header_ops macvlan_hard_header_ops = { |
218 | .create = macvlan_hard_header, | |
219 | .rebuild = eth_rebuild_header, | |
220 | .parse = eth_header_parse, | |
3b04ddde SH |
221 | .cache = eth_header_cache, |
222 | .cache_update = eth_header_cache_update, | |
223 | }; | |
224 | ||
b863ceb7 PM |
225 | static int macvlan_open(struct net_device *dev) |
226 | { | |
227 | struct macvlan_dev *vlan = netdev_priv(dev); | |
b863ceb7 PM |
228 | struct net_device *lowerdev = vlan->lowerdev; |
229 | int err; | |
230 | ||
f9ac30f0 EB |
231 | err = -EBUSY; |
232 | if (macvlan_addr_busy(vlan->port, dev->dev_addr)) | |
233 | goto out; | |
234 | ||
b863ceb7 PM |
235 | err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN); |
236 | if (err < 0) | |
b89fb7da WC |
237 | goto out; |
238 | if (dev->flags & IFF_ALLMULTI) { | |
239 | err = dev_set_allmulti(lowerdev, 1); | |
240 | if (err < 0) | |
241 | goto del_unicast; | |
242 | } | |
f9ac30f0 | 243 | macvlan_hash_add(vlan); |
b863ceb7 | 244 | return 0; |
b89fb7da WC |
245 | |
246 | del_unicast: | |
247 | dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); | |
248 | out: | |
249 | return err; | |
b863ceb7 PM |
250 | } |
251 | ||
252 | static int macvlan_stop(struct net_device *dev) | |
253 | { | |
254 | struct macvlan_dev *vlan = netdev_priv(dev); | |
255 | struct net_device *lowerdev = vlan->lowerdev; | |
256 | ||
257 | dev_mc_unsync(lowerdev, dev); | |
258 | if (dev->flags & IFF_ALLMULTI) | |
259 | dev_set_allmulti(lowerdev, -1); | |
260 | ||
261 | dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); | |
262 | ||
f9ac30f0 | 263 | macvlan_hash_del(vlan); |
b863ceb7 PM |
264 | return 0; |
265 | } | |
266 | ||
ad5d20a6 PM |
267 | static int macvlan_set_mac_address(struct net_device *dev, void *p) |
268 | { | |
269 | struct macvlan_dev *vlan = netdev_priv(dev); | |
270 | struct net_device *lowerdev = vlan->lowerdev; | |
271 | struct sockaddr *addr = p; | |
272 | int err; | |
273 | ||
274 | if (!is_valid_ether_addr(addr->sa_data)) | |
275 | return -EADDRNOTAVAIL; | |
276 | ||
f9ac30f0 EB |
277 | if (!(dev->flags & IFF_UP)) { |
278 | /* Just copy in the new address */ | |
279 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); | |
280 | } else { | |
281 | /* Rehash and update the device filters */ | |
282 | if (macvlan_addr_busy(vlan->port, addr->sa_data)) | |
283 | return -EBUSY; | |
ad5d20a6 | 284 | |
f9ac30f0 EB |
285 | if ((err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN))) |
286 | return err; | |
ad5d20a6 | 287 | |
f9ac30f0 EB |
288 | dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); |
289 | ||
290 | macvlan_hash_change_addr(vlan, addr->sa_data); | |
291 | } | |
ad5d20a6 PM |
292 | return 0; |
293 | } | |
294 | ||
b863ceb7 PM |
295 | static void macvlan_change_rx_flags(struct net_device *dev, int change) |
296 | { | |
297 | struct macvlan_dev *vlan = netdev_priv(dev); | |
298 | struct net_device *lowerdev = vlan->lowerdev; | |
299 | ||
300 | if (change & IFF_ALLMULTI) | |
301 | dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); | |
302 | } | |
303 | ||
304 | static void macvlan_set_multicast_list(struct net_device *dev) | |
305 | { | |
306 | struct macvlan_dev *vlan = netdev_priv(dev); | |
307 | ||
308 | dev_mc_sync(vlan->lowerdev, dev); | |
309 | } | |
310 | ||
311 | static int macvlan_change_mtu(struct net_device *dev, int new_mtu) | |
312 | { | |
313 | struct macvlan_dev *vlan = netdev_priv(dev); | |
314 | ||
315 | if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) | |
316 | return -EINVAL; | |
317 | dev->mtu = new_mtu; | |
318 | return 0; | |
319 | } | |
320 | ||
321 | /* | |
322 | * macvlan network devices have devices nesting below it and are a special | |
323 | * "super class" of normal network devices; split their locks off into a | |
324 | * separate class since they always nest. | |
325 | */ | |
326 | static struct lock_class_key macvlan_netdev_xmit_lock_key; | |
cf508b12 | 327 | static struct lock_class_key macvlan_netdev_addr_lock_key; |
b863ceb7 PM |
328 | |
329 | #define MACVLAN_FEATURES \ | |
330 | (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ | |
331 | NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ | |
332 | NETIF_F_TSO_ECN | NETIF_F_TSO6) | |
333 | ||
334 | #define MACVLAN_STATE_MASK \ | |
335 | ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) | |
336 | ||
e8a0464c DM |
337 | static void macvlan_set_lockdep_class_one(struct net_device *dev, |
338 | struct netdev_queue *txq, | |
339 | void *_unused) | |
c773e847 DM |
340 | { |
341 | lockdep_set_class(&txq->_xmit_lock, | |
342 | &macvlan_netdev_xmit_lock_key); | |
343 | } | |
344 | ||
345 | static void macvlan_set_lockdep_class(struct net_device *dev) | |
346 | { | |
cf508b12 DM |
347 | lockdep_set_class(&dev->addr_list_lock, |
348 | &macvlan_netdev_addr_lock_key); | |
e8a0464c | 349 | netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); |
c773e847 DM |
350 | } |
351 | ||
b863ceb7 PM |
352 | static int macvlan_init(struct net_device *dev) |
353 | { | |
354 | struct macvlan_dev *vlan = netdev_priv(dev); | |
355 | const struct net_device *lowerdev = vlan->lowerdev; | |
356 | ||
357 | dev->state = (dev->state & ~MACVLAN_STATE_MASK) | | |
358 | (lowerdev->state & MACVLAN_STATE_MASK); | |
359 | dev->features = lowerdev->features & MACVLAN_FEATURES; | |
360 | dev->iflink = lowerdev->ifindex; | |
361 | ||
c773e847 DM |
362 | macvlan_set_lockdep_class(dev); |
363 | ||
b863ceb7 PM |
364 | return 0; |
365 | } | |
366 | ||
367 | static void macvlan_ethtool_get_drvinfo(struct net_device *dev, | |
368 | struct ethtool_drvinfo *drvinfo) | |
369 | { | |
370 | snprintf(drvinfo->driver, 32, "macvlan"); | |
371 | snprintf(drvinfo->version, 32, "0.1"); | |
372 | } | |
373 | ||
374 | static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) | |
375 | { | |
376 | const struct macvlan_dev *vlan = netdev_priv(dev); | |
377 | struct net_device *lowerdev = vlan->lowerdev; | |
378 | ||
379 | if (lowerdev->ethtool_ops->get_rx_csum == NULL) | |
380 | return 0; | |
381 | return lowerdev->ethtool_ops->get_rx_csum(lowerdev); | |
382 | } | |
383 | ||
9edb8bb6 SH |
384 | static int macvlan_ethtool_get_settings(struct net_device *dev, |
385 | struct ethtool_cmd *cmd) | |
386 | { | |
387 | const struct macvlan_dev *vlan = netdev_priv(dev); | |
388 | struct net_device *lowerdev = vlan->lowerdev; | |
389 | ||
390 | if (!lowerdev->ethtool_ops->get_settings) | |
391 | return -EOPNOTSUPP; | |
392 | ||
393 | return lowerdev->ethtool_ops->get_settings(lowerdev, cmd); | |
394 | } | |
395 | ||
396 | static u32 macvlan_ethtool_get_flags(struct net_device *dev) | |
397 | { | |
398 | const struct macvlan_dev *vlan = netdev_priv(dev); | |
399 | struct net_device *lowerdev = vlan->lowerdev; | |
400 | ||
401 | if (!lowerdev->ethtool_ops->get_flags) | |
402 | return 0; | |
403 | return lowerdev->ethtool_ops->get_flags(lowerdev); | |
404 | } | |
405 | ||
b863ceb7 PM |
406 | static const struct ethtool_ops macvlan_ethtool_ops = { |
407 | .get_link = ethtool_op_get_link, | |
9edb8bb6 | 408 | .get_settings = macvlan_ethtool_get_settings, |
b863ceb7 | 409 | .get_rx_csum = macvlan_ethtool_get_rx_csum, |
b863ceb7 | 410 | .get_drvinfo = macvlan_ethtool_get_drvinfo, |
9edb8bb6 | 411 | .get_flags = macvlan_ethtool_get_flags, |
b863ceb7 PM |
412 | }; |
413 | ||
54a30c97 SH |
414 | static const struct net_device_ops macvlan_netdev_ops = { |
415 | .ndo_init = macvlan_init, | |
416 | .ndo_open = macvlan_open, | |
417 | .ndo_stop = macvlan_stop, | |
00829823 | 418 | .ndo_start_xmit = macvlan_start_xmit, |
54a30c97 SH |
419 | .ndo_change_mtu = macvlan_change_mtu, |
420 | .ndo_change_rx_flags = macvlan_change_rx_flags, | |
421 | .ndo_set_mac_address = macvlan_set_mac_address, | |
422 | .ndo_set_multicast_list = macvlan_set_multicast_list, | |
423 | .ndo_validate_addr = eth_validate_addr, | |
424 | }; | |
425 | ||
b863ceb7 PM |
426 | static void macvlan_setup(struct net_device *dev) |
427 | { | |
428 | ether_setup(dev); | |
429 | ||
54a30c97 | 430 | dev->netdev_ops = &macvlan_netdev_ops; |
b863ceb7 | 431 | dev->destructor = free_netdev; |
3b04ddde | 432 | dev->header_ops = &macvlan_hard_header_ops, |
b863ceb7 PM |
433 | dev->ethtool_ops = &macvlan_ethtool_ops; |
434 | dev->tx_queue_len = 0; | |
435 | } | |
436 | ||
437 | static int macvlan_port_create(struct net_device *dev) | |
438 | { | |
439 | struct macvlan_port *port; | |
440 | unsigned int i; | |
441 | ||
442 | if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) | |
443 | return -EINVAL; | |
444 | ||
445 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
446 | if (port == NULL) | |
447 | return -ENOMEM; | |
448 | ||
449 | port->dev = dev; | |
450 | INIT_LIST_HEAD(&port->vlans); | |
451 | for (i = 0; i < MACVLAN_HASH_SIZE; i++) | |
452 | INIT_HLIST_HEAD(&port->vlan_hash[i]); | |
453 | rcu_assign_pointer(dev->macvlan_port, port); | |
454 | return 0; | |
455 | } | |
456 | ||
457 | static void macvlan_port_destroy(struct net_device *dev) | |
458 | { | |
459 | struct macvlan_port *port = dev->macvlan_port; | |
460 | ||
461 | rcu_assign_pointer(dev->macvlan_port, NULL); | |
462 | synchronize_rcu(); | |
463 | kfree(port); | |
464 | } | |
465 | ||
466 | static void macvlan_transfer_operstate(struct net_device *dev) | |
467 | { | |
468 | struct macvlan_dev *vlan = netdev_priv(dev); | |
469 | const struct net_device *lowerdev = vlan->lowerdev; | |
470 | ||
471 | if (lowerdev->operstate == IF_OPER_DORMANT) | |
472 | netif_dormant_on(dev); | |
473 | else | |
474 | netif_dormant_off(dev); | |
475 | ||
476 | if (netif_carrier_ok(lowerdev)) { | |
477 | if (!netif_carrier_ok(dev)) | |
478 | netif_carrier_on(dev); | |
479 | } else { | |
f12ca5f9 | 480 | if (netif_carrier_ok(dev)) |
b863ceb7 PM |
481 | netif_carrier_off(dev); |
482 | } | |
483 | } | |
484 | ||
485 | static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
486 | { | |
487 | if (tb[IFLA_ADDRESS]) { | |
488 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
489 | return -EINVAL; | |
490 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
491 | return -EADDRNOTAVAIL; | |
492 | } | |
493 | return 0; | |
494 | } | |
495 | ||
496 | static int macvlan_newlink(struct net_device *dev, | |
497 | struct nlattr *tb[], struct nlattr *data[]) | |
498 | { | |
499 | struct macvlan_dev *vlan = netdev_priv(dev); | |
500 | struct macvlan_port *port; | |
501 | struct net_device *lowerdev; | |
502 | int err; | |
503 | ||
504 | if (!tb[IFLA_LINK]) | |
505 | return -EINVAL; | |
506 | ||
c346dca1 | 507 | lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK])); |
b863ceb7 PM |
508 | if (lowerdev == NULL) |
509 | return -ENODEV; | |
510 | ||
b0832a29 EB |
511 | /* When creating macvlans on top of other macvlans - use |
512 | * the real device as the lowerdev. | |
a6ca5f1d | 513 | */ |
b0832a29 EB |
514 | if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { |
515 | struct macvlan_dev *lowervlan = netdev_priv(lowerdev); | |
516 | lowerdev = lowervlan->lowerdev; | |
517 | } | |
a6ca5f1d | 518 | |
b863ceb7 PM |
519 | if (!tb[IFLA_MTU]) |
520 | dev->mtu = lowerdev->mtu; | |
521 | else if (dev->mtu > lowerdev->mtu) | |
522 | return -EINVAL; | |
523 | ||
524 | if (!tb[IFLA_ADDRESS]) | |
525 | random_ether_addr(dev->dev_addr); | |
526 | ||
527 | if (lowerdev->macvlan_port == NULL) { | |
528 | err = macvlan_port_create(lowerdev); | |
529 | if (err < 0) | |
530 | return err; | |
531 | } | |
532 | port = lowerdev->macvlan_port; | |
533 | ||
534 | vlan->lowerdev = lowerdev; | |
535 | vlan->dev = dev; | |
536 | vlan->port = port; | |
537 | ||
538 | err = register_netdevice(dev); | |
539 | if (err < 0) | |
540 | return err; | |
541 | ||
542 | list_add_tail(&vlan->list, &port->vlans); | |
543 | macvlan_transfer_operstate(dev); | |
544 | return 0; | |
545 | } | |
546 | ||
547 | static void macvlan_dellink(struct net_device *dev) | |
548 | { | |
549 | struct macvlan_dev *vlan = netdev_priv(dev); | |
550 | struct macvlan_port *port = vlan->port; | |
551 | ||
552 | list_del(&vlan->list); | |
553 | unregister_netdevice(dev); | |
554 | ||
555 | if (list_empty(&port->vlans)) | |
73120964 | 556 | macvlan_port_destroy(port->dev); |
b863ceb7 PM |
557 | } |
558 | ||
559 | static struct rtnl_link_ops macvlan_link_ops __read_mostly = { | |
560 | .kind = "macvlan", | |
561 | .priv_size = sizeof(struct macvlan_dev), | |
562 | .setup = macvlan_setup, | |
563 | .validate = macvlan_validate, | |
564 | .newlink = macvlan_newlink, | |
565 | .dellink = macvlan_dellink, | |
566 | }; | |
567 | ||
568 | static int macvlan_device_event(struct notifier_block *unused, | |
569 | unsigned long event, void *ptr) | |
570 | { | |
571 | struct net_device *dev = ptr; | |
572 | struct macvlan_dev *vlan, *next; | |
573 | struct macvlan_port *port; | |
574 | ||
575 | port = dev->macvlan_port; | |
576 | if (port == NULL) | |
577 | return NOTIFY_DONE; | |
578 | ||
579 | switch (event) { | |
580 | case NETDEV_CHANGE: | |
581 | list_for_each_entry(vlan, &port->vlans, list) | |
582 | macvlan_transfer_operstate(vlan->dev); | |
583 | break; | |
584 | case NETDEV_FEAT_CHANGE: | |
585 | list_for_each_entry(vlan, &port->vlans, list) { | |
586 | vlan->dev->features = dev->features & MACVLAN_FEATURES; | |
587 | netdev_features_change(vlan->dev); | |
588 | } | |
589 | break; | |
590 | case NETDEV_UNREGISTER: | |
591 | list_for_each_entry_safe(vlan, next, &port->vlans, list) | |
592 | macvlan_dellink(vlan->dev); | |
593 | break; | |
594 | } | |
595 | return NOTIFY_DONE; | |
596 | } | |
597 | ||
598 | static struct notifier_block macvlan_notifier_block __read_mostly = { | |
599 | .notifier_call = macvlan_device_event, | |
600 | }; | |
601 | ||
602 | static int __init macvlan_init_module(void) | |
603 | { | |
604 | int err; | |
605 | ||
606 | register_netdevice_notifier(&macvlan_notifier_block); | |
607 | macvlan_handle_frame_hook = macvlan_handle_frame; | |
608 | ||
609 | err = rtnl_link_register(&macvlan_link_ops); | |
610 | if (err < 0) | |
611 | goto err1; | |
612 | return 0; | |
613 | err1: | |
52913246 | 614 | macvlan_handle_frame_hook = NULL; |
b863ceb7 PM |
615 | unregister_netdevice_notifier(&macvlan_notifier_block); |
616 | return err; | |
617 | } | |
618 | ||
619 | static void __exit macvlan_cleanup_module(void) | |
620 | { | |
621 | rtnl_link_unregister(&macvlan_link_ops); | |
622 | macvlan_handle_frame_hook = NULL; | |
623 | unregister_netdevice_notifier(&macvlan_notifier_block); | |
624 | } | |
625 | ||
626 | module_init(macvlan_init_module); | |
627 | module_exit(macvlan_cleanup_module); | |
628 | ||
629 | MODULE_LICENSE("GPL"); | |
630 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
631 | MODULE_DESCRIPTION("Driver for MAC address based VLANs"); | |
632 | MODULE_ALIAS_RTNL_LINK("macvlan"); |