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eCryptfs: Copy up attributes of the lower target inode after rename
[linux/fpc-iii.git] / drivers / net / macvlan.c
blob97f342e64d671e0793428a37a6d1ebc71a750910
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, bool sync)
74 {
75 hlist_del_rcu(&vlan->hlist);
76 if (sync)
77 synchronize_rcu();
78 }
79
80 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
81 const unsigned char *addr)
82 {
83 macvlan_hash_del(vlan, true);
84 /* Now that we are unhashed it is safe to change the device
85 * address without confusing packet delivery.
86 */
87 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
88 macvlan_hash_add(vlan);
89 }
90
91 static int macvlan_addr_busy(const struct macvlan_port *port,
92 const unsigned char *addr)
93 {
94 /* Test to see if the specified multicast address is
95 * currently in use by the underlying device or
96 * another macvlan.
97 */
98 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
99 return 1;
100
101 if (macvlan_hash_lookup(port, addr))
102 return 1;
103
104 return 0;
105 }
106
107
108 static int macvlan_broadcast_one(struct sk_buff *skb,
109 const struct macvlan_dev *vlan,
110 const struct ethhdr *eth, bool local)
111 {
112 struct net_device *dev = vlan->dev;
113 if (!skb)
114 return NET_RX_DROP;
115
116 if (local)
117 return vlan->forward(dev, skb);
118
119 skb->dev = dev;
120 if (!compare_ether_addr_64bits(eth->h_dest,
121 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 dev_set_promiscuity(lowerdev, 1);
315 goto hash_add;
316 }
317
318 err = -EBUSY;
319 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
320 goto out;
321
322 err = dev_uc_add(lowerdev, dev->dev_addr);
323 if (err < 0)
324 goto out;
325 if (dev->flags & IFF_ALLMULTI) {
326 err = dev_set_allmulti(lowerdev, 1);
327 if (err < 0)
328 goto del_unicast;
329 }
330
331 hash_add:
332 macvlan_hash_add(vlan);
333 return 0;
334
335 del_unicast:
336 dev_uc_del(lowerdev, dev->dev_addr);
337 out:
338 return err;
339 }
340
341 static int macvlan_stop(struct net_device *dev)
342 {
343 struct macvlan_dev *vlan = netdev_priv(dev);
344 struct net_device *lowerdev = vlan->lowerdev;
345
346 if (vlan->port->passthru) {
347 dev_set_promiscuity(lowerdev, -1);
348 goto hash_del;
349 }
350
351 dev_mc_unsync(lowerdev, dev);
352 if (dev->flags & IFF_ALLMULTI)
353 dev_set_allmulti(lowerdev, -1);
354
355 dev_uc_del(lowerdev, dev->dev_addr);
356
357 hash_del:
358 macvlan_hash_del(vlan, !dev->dismantle);
359 return 0;
360 }
361
362 static int macvlan_set_mac_address(struct net_device *dev, void *p)
363 {
364 struct macvlan_dev *vlan = netdev_priv(dev);
365 struct net_device *lowerdev = vlan->lowerdev;
366 struct sockaddr *addr = p;
367 int err;
368
369 if (!is_valid_ether_addr(addr->sa_data))
370 return -EADDRNOTAVAIL;
371
372 if (!(dev->flags & IFF_UP)) {
373 /* Just copy in the new address */
374 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
375 } else {
376 /* Rehash and update the device filters */
377 if (macvlan_addr_busy(vlan->port, addr->sa_data))
378 return -EBUSY;
379
380 err = dev_uc_add(lowerdev, addr->sa_data);
381 if (err)
382 return err;
383
384 dev_uc_del(lowerdev, dev->dev_addr);
385
386 macvlan_hash_change_addr(vlan, addr->sa_data);
387 }
388 return 0;
389 }
390
391 static void macvlan_change_rx_flags(struct net_device *dev, int change)
392 {
393 struct macvlan_dev *vlan = netdev_priv(dev);
394 struct net_device *lowerdev = vlan->lowerdev;
395
396 if (change & IFF_ALLMULTI)
397 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
398 }
399
400 static void macvlan_set_multicast_list(struct net_device *dev)
401 {
402 struct macvlan_dev *vlan = netdev_priv(dev);
403
404 dev_mc_sync(vlan->lowerdev, dev);
405 }
406
407 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
408 {
409 struct macvlan_dev *vlan = netdev_priv(dev);
410
411 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
412 return -EINVAL;
413 dev->mtu = new_mtu;
414 return 0;
415 }
416
417 /*
418 * macvlan network devices have devices nesting below it and are a special
419 * "super class" of normal network devices; split their locks off into a
420 * separate class since they always nest.
421 */
422 static struct lock_class_key macvlan_netdev_xmit_lock_key;
423 static struct lock_class_key macvlan_netdev_addr_lock_key;
424
425 #define MACVLAN_FEATURES \
426 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
427 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
428 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
429 NETIF_F_HW_VLAN_FILTER)
430
431 #define MACVLAN_STATE_MASK \
432 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
433
434 static void macvlan_set_lockdep_class_one(struct net_device *dev,
435 struct netdev_queue *txq,
436 void *_unused)
437 {
438 lockdep_set_class(&txq->_xmit_lock,
439 &macvlan_netdev_xmit_lock_key);
440 }
441
442 static void macvlan_set_lockdep_class(struct net_device *dev)
443 {
444 lockdep_set_class(&dev->addr_list_lock,
445 &macvlan_netdev_addr_lock_key);
446 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
447 }
448
449 static int macvlan_init(struct net_device *dev)
450 {
451 struct macvlan_dev *vlan = netdev_priv(dev);
452 const struct net_device *lowerdev = vlan->lowerdev;
453
454 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
455 (lowerdev->state & MACVLAN_STATE_MASK);
456 dev->features = lowerdev->features & MACVLAN_FEATURES;
457 dev->features |= NETIF_F_LLTX;
458 dev->gso_max_size = lowerdev->gso_max_size;
459 dev->iflink = lowerdev->ifindex;
460 dev->hard_header_len = lowerdev->hard_header_len;
461
462 macvlan_set_lockdep_class(dev);
463
464 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
465 if (!vlan->pcpu_stats)
466 return -ENOMEM;
467
468 return 0;
469 }
470
471 static void macvlan_uninit(struct net_device *dev)
472 {
473 struct macvlan_dev *vlan = netdev_priv(dev);
474 struct macvlan_port *port = vlan->port;
475
476 free_percpu(vlan->pcpu_stats);
477
478 port->count -= 1;
479 if (!port->count)
480 macvlan_port_destroy(port->dev);
481 }
482
483 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
484 struct rtnl_link_stats64 *stats)
485 {
486 struct macvlan_dev *vlan = netdev_priv(dev);
487
488 if (vlan->pcpu_stats) {
489 struct macvlan_pcpu_stats *p;
490 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
491 u32 rx_errors = 0, tx_dropped = 0;
492 unsigned int start;
493 int i;
494
495 for_each_possible_cpu(i) {
496 p = per_cpu_ptr(vlan->pcpu_stats, i);
497 do {
498 start = u64_stats_fetch_begin_bh(&p->syncp);
499 rx_packets = p->rx_packets;
500 rx_bytes = p->rx_bytes;
501 rx_multicast = p->rx_multicast;
502 tx_packets = p->tx_packets;
503 tx_bytes = p->tx_bytes;
504 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
505
506 stats->rx_packets += rx_packets;
507 stats->rx_bytes += rx_bytes;
508 stats->multicast += rx_multicast;
509 stats->tx_packets += tx_packets;
510 stats->tx_bytes += tx_bytes;
511 /* rx_errors & tx_dropped are u32, updated
512 * without syncp protection.
513 */
514 rx_errors += p->rx_errors;
515 tx_dropped += p->tx_dropped;
516 }
517 stats->rx_errors = rx_errors;
518 stats->rx_dropped = rx_errors;
519 stats->tx_dropped = tx_dropped;
520 }
521 return stats;
522 }
523
524 static void macvlan_vlan_rx_add_vid(struct net_device *dev,
525 unsigned short vid)
526 {
527 struct macvlan_dev *vlan = netdev_priv(dev);
528 struct net_device *lowerdev = vlan->lowerdev;
529 const struct net_device_ops *ops = lowerdev->netdev_ops;
530
531 if (ops->ndo_vlan_rx_add_vid)
532 ops->ndo_vlan_rx_add_vid(lowerdev, vid);
533 }
534
535 static void macvlan_vlan_rx_kill_vid(struct net_device *dev,
536 unsigned short vid)
537 {
538 struct macvlan_dev *vlan = netdev_priv(dev);
539 struct net_device *lowerdev = vlan->lowerdev;
540 const struct net_device_ops *ops = lowerdev->netdev_ops;
541
542 if (ops->ndo_vlan_rx_kill_vid)
543 ops->ndo_vlan_rx_kill_vid(lowerdev, vid);
544 }
545
546 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
547 struct ethtool_drvinfo *drvinfo)
548 {
549 snprintf(drvinfo->driver, 32, "macvlan");
550 snprintf(drvinfo->version, 32, "0.1");
551 }
552
553 static int macvlan_ethtool_get_settings(struct net_device *dev,
554 struct ethtool_cmd *cmd)
555 {
556 const struct macvlan_dev *vlan = netdev_priv(dev);
557
558 return __ethtool_get_settings(vlan->lowerdev, cmd);
559 }
560
561 static const struct ethtool_ops macvlan_ethtool_ops = {
562 .get_link = ethtool_op_get_link,
563 .get_settings = macvlan_ethtool_get_settings,
564 .get_drvinfo = macvlan_ethtool_get_drvinfo,
565 };
566
567 static const struct net_device_ops macvlan_netdev_ops = {
568 .ndo_init = macvlan_init,
569 .ndo_uninit = macvlan_uninit,
570 .ndo_open = macvlan_open,
571 .ndo_stop = macvlan_stop,
572 .ndo_start_xmit = macvlan_start_xmit,
573 .ndo_change_mtu = macvlan_change_mtu,
574 .ndo_change_rx_flags = macvlan_change_rx_flags,
575 .ndo_set_mac_address = macvlan_set_mac_address,
576 .ndo_set_rx_mode = macvlan_set_multicast_list,
577 .ndo_get_stats64 = macvlan_dev_get_stats64,
578 .ndo_validate_addr = eth_validate_addr,
579 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
580 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
581 };
582
583 void macvlan_common_setup(struct net_device *dev)
584 {
585 ether_setup(dev);
586
587 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
588 dev->netdev_ops = &macvlan_netdev_ops;
589 dev->destructor = free_netdev;
590 dev->header_ops = &macvlan_hard_header_ops,
591 dev->ethtool_ops = &macvlan_ethtool_ops;
592 }
593 EXPORT_SYMBOL_GPL(macvlan_common_setup);
594
595 static void macvlan_setup(struct net_device *dev)
596 {
597 macvlan_common_setup(dev);
598 dev->tx_queue_len = 0;
599 }
600
601 static int macvlan_port_create(struct net_device *dev)
602 {
603 struct macvlan_port *port;
604 unsigned int i;
605 int err;
606
607 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
608 return -EINVAL;
609
610 port = kzalloc(sizeof(*port), GFP_KERNEL);
611 if (port == NULL)
612 return -ENOMEM;
613
614 port->passthru = false;
615 port->dev = dev;
616 INIT_LIST_HEAD(&port->vlans);
617 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
618 INIT_HLIST_HEAD(&port->vlan_hash[i]);
619
620 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
621 if (err)
622 kfree(port);
623 else
624 dev->priv_flags |= IFF_MACVLAN_PORT;
625 return err;
626 }
627
628 static void macvlan_port_destroy(struct net_device *dev)
629 {
630 struct macvlan_port *port = macvlan_port_get(dev);
631
632 dev->priv_flags &= ~IFF_MACVLAN_PORT;
633 netdev_rx_handler_unregister(dev);
634 kfree_rcu(port, rcu);
635 }
636
637 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
638 {
639 if (tb[IFLA_ADDRESS]) {
640 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
641 return -EINVAL;
642 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
643 return -EADDRNOTAVAIL;
644 }
645
646 if (data && data[IFLA_MACVLAN_MODE]) {
647 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
648 case MACVLAN_MODE_PRIVATE:
649 case MACVLAN_MODE_VEPA:
650 case MACVLAN_MODE_BRIDGE:
651 case MACVLAN_MODE_PASSTHRU:
652 break;
653 default:
654 return -EINVAL;
655 }
656 }
657 return 0;
658 }
659
660 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
661 struct nlattr *tb[], struct nlattr *data[],
662 int (*receive)(struct sk_buff *skb),
663 int (*forward)(struct net_device *dev,
664 struct sk_buff *skb))
665 {
666 struct macvlan_dev *vlan = netdev_priv(dev);
667 struct macvlan_port *port;
668 struct net_device *lowerdev;
669 int err;
670
671 if (!tb[IFLA_LINK])
672 return -EINVAL;
673
674 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
675 if (lowerdev == NULL)
676 return -ENODEV;
677
678 /* When creating macvlans on top of other macvlans - use
679 * the real device as the lowerdev.
680 */
681 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
682 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
683 lowerdev = lowervlan->lowerdev;
684 }
685
686 if (!tb[IFLA_MTU])
687 dev->mtu = lowerdev->mtu;
688 else if (dev->mtu > lowerdev->mtu)
689 return -EINVAL;
690
691 if (!tb[IFLA_ADDRESS])
692 random_ether_addr(dev->dev_addr);
693
694 if (!macvlan_port_exists(lowerdev)) {
695 err = macvlan_port_create(lowerdev);
696 if (err < 0)
697 return err;
698 }
699 port = macvlan_port_get(lowerdev);
700
701 /* Only 1 macvlan device can be created in passthru mode */
702 if (port->passthru)
703 return -EINVAL;
704
705 vlan->lowerdev = lowerdev;
706 vlan->dev = dev;
707 vlan->port = port;
708 vlan->receive = receive;
709 vlan->forward = forward;
710
711 vlan->mode = MACVLAN_MODE_VEPA;
712 if (data && data[IFLA_MACVLAN_MODE])
713 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
714
715 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
716 if (port->count)
717 return -EINVAL;
718 port->passthru = true;
719 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
720 }
721
722 port->count += 1;
723 err = register_netdevice(dev);
724 if (err < 0)
725 goto destroy_port;
726
727 list_add_tail(&vlan->list, &port->vlans);
728 netif_stacked_transfer_operstate(lowerdev, dev);
729
730 return 0;
731
732 destroy_port:
733 port->count -= 1;
734 if (!port->count)
735 macvlan_port_destroy(lowerdev);
736
737 return err;
738 }
739 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
740
741 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
742 struct nlattr *tb[], struct nlattr *data[])
743 {
744 return macvlan_common_newlink(src_net, dev, tb, data,
745 netif_rx,
746 dev_forward_skb);
747 }
748
749 void macvlan_dellink(struct net_device *dev, struct list_head *head)
750 {
751 struct macvlan_dev *vlan = netdev_priv(dev);
752
753 list_del(&vlan->list);
754 unregister_netdevice_queue(dev, head);
755 }
756 EXPORT_SYMBOL_GPL(macvlan_dellink);
757
758 static int macvlan_changelink(struct net_device *dev,
759 struct nlattr *tb[], struct nlattr *data[])
760 {
761 struct macvlan_dev *vlan = netdev_priv(dev);
762 if (data && data[IFLA_MACVLAN_MODE])
763 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
764 return 0;
765 }
766
767 static size_t macvlan_get_size(const struct net_device *dev)
768 {
769 return nla_total_size(4);
770 }
771
772 static int macvlan_fill_info(struct sk_buff *skb,
773 const struct net_device *dev)
774 {
775 struct macvlan_dev *vlan = netdev_priv(dev);
776
777 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
778 return 0;
779
780 nla_put_failure:
781 return -EMSGSIZE;
782 }
783
784 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
785 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
786 };
787
788 int macvlan_link_register(struct rtnl_link_ops *ops)
789 {
790 /* common fields */
791 ops->priv_size = sizeof(struct macvlan_dev);
792 ops->validate = macvlan_validate;
793 ops->maxtype = IFLA_MACVLAN_MAX;
794 ops->policy = macvlan_policy;
795 ops->changelink = macvlan_changelink;
796 ops->get_size = macvlan_get_size;
797 ops->fill_info = macvlan_fill_info;
798
799 return rtnl_link_register(ops);
800 };
801 EXPORT_SYMBOL_GPL(macvlan_link_register);
802
803 static struct rtnl_link_ops macvlan_link_ops = {
804 .kind = "macvlan",
805 .setup = macvlan_setup,
806 .newlink = macvlan_newlink,
807 .dellink = macvlan_dellink,
808 };
809
810 static int macvlan_device_event(struct notifier_block *unused,
811 unsigned long event, void *ptr)
812 {
813 struct net_device *dev = ptr;
814 struct macvlan_dev *vlan, *next;
815 struct macvlan_port *port;
816 LIST_HEAD(list_kill);
817
818 if (!macvlan_port_exists(dev))
819 return NOTIFY_DONE;
820
821 port = macvlan_port_get(dev);
822
823 switch (event) {
824 case NETDEV_CHANGE:
825 list_for_each_entry(vlan, &port->vlans, list)
826 netif_stacked_transfer_operstate(vlan->lowerdev,
827 vlan->dev);
828 break;
829 case NETDEV_FEAT_CHANGE:
830 list_for_each_entry(vlan, &port->vlans, list) {
831 vlan->dev->features = dev->features & MACVLAN_FEATURES;
832 vlan->dev->gso_max_size = dev->gso_max_size;
833 netdev_features_change(vlan->dev);
834 }
835 break;
836 case NETDEV_UNREGISTER:
837 /* twiddle thumbs on netns device moves */
838 if (dev->reg_state != NETREG_UNREGISTERING)
839 break;
840
841 list_for_each_entry_safe(vlan, next, &port->vlans, list)
842 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
843 unregister_netdevice_many(&list_kill);
844 list_del(&list_kill);
845 break;
846 case NETDEV_PRE_TYPE_CHANGE:
847 /* Forbid underlaying device to change its type. */
848 return NOTIFY_BAD;
849 }
850 return NOTIFY_DONE;
851 }
852
853 static struct notifier_block macvlan_notifier_block __read_mostly = {
854 .notifier_call = macvlan_device_event,
855 };
856
857 static int __init macvlan_init_module(void)
858 {
859 int err;
860
861 register_netdevice_notifier(&macvlan_notifier_block);
862
863 err = macvlan_link_register(&macvlan_link_ops);
864 if (err < 0)
865 goto err1;
866 return 0;
867 err1:
868 unregister_netdevice_notifier(&macvlan_notifier_block);
869 return err;
870 }
871
872 static void __exit macvlan_cleanup_module(void)
873 {
874 rtnl_link_unregister(&macvlan_link_ops);
875 unregister_netdevice_notifier(&macvlan_notifier_block);
876 }
877
878 module_init(macvlan_init_module);
879 module_exit(macvlan_cleanup_module);
880
881 MODULE_LICENSE("GPL");
882 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
883 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
884 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux with added FPC-III support