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mwifiex: add custom IE framework
[deliverable/linux.git] / drivers / net / macvlan.c
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 (!compare_ether_addr_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 (!compare_ether_addr_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 (!compare_ether_addr_64bits(eth->h_dest,
122 dev->broadcast))
123 skb->pkt_type = PACKET_BROADCAST;
124 else
125 skb->pkt_type = PACKET_MULTICAST;
126
127 return vlan->receive(skb);
128 }
129
130 static void macvlan_broadcast(struct sk_buff *skb,
131 const struct macvlan_port *port,
132 struct net_device *src,
133 enum macvlan_mode mode)
134 {
135 const struct ethhdr *eth = eth_hdr(skb);
136 const struct macvlan_dev *vlan;
137 struct hlist_node *n;
138 struct sk_buff *nskb;
139 unsigned int i;
140 int err;
141
142 if (skb->protocol == htons(ETH_P_PAUSE))
143 return;
144
145 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
146 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
147 if (vlan->dev == src || !(vlan->mode & mode))
148 continue;
149
150 nskb = skb_clone(skb, GFP_ATOMIC);
151 err = macvlan_broadcast_one(nskb, vlan, eth,
152 mode == MACVLAN_MODE_BRIDGE);
153 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
154 err == NET_RX_SUCCESS, 1);
155 }
156 }
157 }
158
159 /* called under rcu_read_lock() from netif_receive_skb */
160 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
161 {
162 struct macvlan_port *port;
163 struct sk_buff *skb = *pskb;
164 const struct ethhdr *eth = eth_hdr(skb);
165 const struct macvlan_dev *vlan;
166 const struct macvlan_dev *src;
167 struct net_device *dev;
168 unsigned int len = 0;
169 int ret = NET_RX_DROP;
170
171 port = macvlan_port_get_rcu(skb->dev);
172 if (is_multicast_ether_addr(eth->h_dest)) {
173 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
174 if (!skb)
175 return RX_HANDLER_CONSUMED;
176 eth = eth_hdr(skb);
177 src = macvlan_hash_lookup(port, eth->h_source);
178 if (!src)
179 /* frame comes from an external address */
180 macvlan_broadcast(skb, port, NULL,
181 MACVLAN_MODE_PRIVATE |
182 MACVLAN_MODE_VEPA |
183 MACVLAN_MODE_PASSTHRU|
184 MACVLAN_MODE_BRIDGE);
185 else if (src->mode == MACVLAN_MODE_VEPA)
186 /* flood to everyone except source */
187 macvlan_broadcast(skb, port, src->dev,
188 MACVLAN_MODE_VEPA |
189 MACVLAN_MODE_BRIDGE);
190 else if (src->mode == MACVLAN_MODE_BRIDGE)
191 /*
192 * flood only to VEPA ports, bridge ports
193 * already saw the frame on the way out.
194 */
195 macvlan_broadcast(skb, port, src->dev,
196 MACVLAN_MODE_VEPA);
197 else {
198 /* forward to original port. */
199 vlan = src;
200 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
201 goto out;
202 }
203
204 return RX_HANDLER_PASS;
205 }
206
207 if (port->passthru)
208 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
209 else
210 vlan = macvlan_hash_lookup(port, eth->h_dest);
211 if (vlan == NULL)
212 return RX_HANDLER_PASS;
213
214 dev = vlan->dev;
215 if (unlikely(!(dev->flags & IFF_UP))) {
216 kfree_skb(skb);
217 return RX_HANDLER_CONSUMED;
218 }
219 len = skb->len + ETH_HLEN;
220 skb = skb_share_check(skb, GFP_ATOMIC);
221 if (!skb)
222 goto out;
223
224 skb->dev = dev;
225 skb->pkt_type = PACKET_HOST;
226
227 ret = vlan->receive(skb);
228
229 out:
230 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
231 return RX_HANDLER_CONSUMED;
232 }
233
234 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
235 {
236 const struct macvlan_dev *vlan = netdev_priv(dev);
237 const struct macvlan_port *port = vlan->port;
238 const struct macvlan_dev *dest;
239 __u8 ip_summed = skb->ip_summed;
240
241 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
242 const struct ethhdr *eth = (void *)skb->data;
243 skb->ip_summed = CHECKSUM_UNNECESSARY;
244
245 /* send to other bridge ports directly */
246 if (is_multicast_ether_addr(eth->h_dest)) {
247 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
248 goto xmit_world;
249 }
250
251 dest = macvlan_hash_lookup(port, eth->h_dest);
252 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
253 /* send to lowerdev first for its network taps */
254 dev_forward_skb(vlan->lowerdev, skb);
255
256 return NET_XMIT_SUCCESS;
257 }
258 }
259
260 xmit_world:
261 skb->ip_summed = ip_summed;
262 skb_set_dev(skb, vlan->lowerdev);
263 return dev_queue_xmit(skb);
264 }
265
266 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
267 struct net_device *dev)
268 {
269 unsigned int len = skb->len;
270 int ret;
271 const struct macvlan_dev *vlan = netdev_priv(dev);
272
273 ret = macvlan_queue_xmit(skb, dev);
274 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
275 struct macvlan_pcpu_stats *pcpu_stats;
276
277 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
278 u64_stats_update_begin(&pcpu_stats->syncp);
279 pcpu_stats->tx_packets++;
280 pcpu_stats->tx_bytes += len;
281 u64_stats_update_end(&pcpu_stats->syncp);
282 } else {
283 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
284 }
285 return ret;
286 }
287 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
288
289 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
290 unsigned short type, const void *daddr,
291 const void *saddr, unsigned len)
292 {
293 const struct macvlan_dev *vlan = netdev_priv(dev);
294 struct net_device *lowerdev = vlan->lowerdev;
295
296 return dev_hard_header(skb, lowerdev, type, daddr,
297 saddr ? : dev->dev_addr, len);
298 }
299
300 static const struct header_ops macvlan_hard_header_ops = {
301 .create = macvlan_hard_header,
302 .rebuild = eth_rebuild_header,
303 .parse = eth_header_parse,
304 .cache = eth_header_cache,
305 .cache_update = eth_header_cache_update,
306 };
307
308 static int macvlan_open(struct net_device *dev)
309 {
310 struct macvlan_dev *vlan = netdev_priv(dev);
311 struct net_device *lowerdev = vlan->lowerdev;
312 int err;
313
314 if (vlan->port->passthru) {
315 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
316 dev_set_promiscuity(lowerdev, 1);
317 goto hash_add;
318 }
319
320 err = -EBUSY;
321 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
322 goto out;
323
324 err = dev_uc_add(lowerdev, dev->dev_addr);
325 if (err < 0)
326 goto out;
327 if (dev->flags & IFF_ALLMULTI) {
328 err = dev_set_allmulti(lowerdev, 1);
329 if (err < 0)
330 goto del_unicast;
331 }
332
333 hash_add:
334 macvlan_hash_add(vlan);
335 return 0;
336
337 del_unicast:
338 dev_uc_del(lowerdev, dev->dev_addr);
339 out:
340 return err;
341 }
342
343 static int macvlan_stop(struct net_device *dev)
344 {
345 struct macvlan_dev *vlan = netdev_priv(dev);
346 struct net_device *lowerdev = vlan->lowerdev;
347
348 dev_uc_unsync(lowerdev, dev);
349 dev_mc_unsync(lowerdev, dev);
350
351 if (vlan->port->passthru) {
352 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
353 dev_set_promiscuity(lowerdev, -1);
354 goto hash_del;
355 }
356
357 if (dev->flags & IFF_ALLMULTI)
358 dev_set_allmulti(lowerdev, -1);
359
360 dev_uc_del(lowerdev, dev->dev_addr);
361
362 hash_del:
363 macvlan_hash_del(vlan, !dev->dismantle);
364 return 0;
365 }
366
367 static int macvlan_set_mac_address(struct net_device *dev, void *p)
368 {
369 struct macvlan_dev *vlan = netdev_priv(dev);
370 struct net_device *lowerdev = vlan->lowerdev;
371 struct sockaddr *addr = p;
372 int err;
373
374 if (!is_valid_ether_addr(addr->sa_data))
375 return -EADDRNOTAVAIL;
376
377 if (!(dev->flags & IFF_UP)) {
378 /* Just copy in the new address */
379 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
380 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
381 } else {
382 /* Rehash and update the device filters */
383 if (macvlan_addr_busy(vlan->port, addr->sa_data))
384 return -EBUSY;
385
386 err = dev_uc_add(lowerdev, addr->sa_data);
387 if (err)
388 return err;
389
390 dev_uc_del(lowerdev, dev->dev_addr);
391
392 macvlan_hash_change_addr(vlan, addr->sa_data);
393 }
394 return 0;
395 }
396
397 static void macvlan_change_rx_flags(struct net_device *dev, int change)
398 {
399 struct macvlan_dev *vlan = netdev_priv(dev);
400 struct net_device *lowerdev = vlan->lowerdev;
401
402 if (change & IFF_ALLMULTI)
403 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
404 }
405
406 static void macvlan_set_mac_lists(struct net_device *dev)
407 {
408 struct macvlan_dev *vlan = netdev_priv(dev);
409
410 dev_uc_sync(vlan->lowerdev, dev);
411 dev_mc_sync(vlan->lowerdev, dev);
412 }
413
414 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
415 {
416 struct macvlan_dev *vlan = netdev_priv(dev);
417
418 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
419 return -EINVAL;
420 dev->mtu = new_mtu;
421 return 0;
422 }
423
424 /*
425 * macvlan network devices have devices nesting below it and are a special
426 * "super class" of normal network devices; split their locks off into a
427 * separate class since they always nest.
428 */
429 static struct lock_class_key macvlan_netdev_xmit_lock_key;
430 static struct lock_class_key macvlan_netdev_addr_lock_key;
431
432 #define MACVLAN_FEATURES \
433 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
434 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
435 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
436 NETIF_F_HW_VLAN_FILTER)
437
438 #define MACVLAN_STATE_MASK \
439 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
440
441 static void macvlan_set_lockdep_class_one(struct net_device *dev,
442 struct netdev_queue *txq,
443 void *_unused)
444 {
445 lockdep_set_class(&txq->_xmit_lock,
446 &macvlan_netdev_xmit_lock_key);
447 }
448
449 static void macvlan_set_lockdep_class(struct net_device *dev)
450 {
451 lockdep_set_class(&dev->addr_list_lock,
452 &macvlan_netdev_addr_lock_key);
453 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
454 }
455
456 static int macvlan_init(struct net_device *dev)
457 {
458 struct macvlan_dev *vlan = netdev_priv(dev);
459 const struct net_device *lowerdev = vlan->lowerdev;
460
461 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
462 (lowerdev->state & MACVLAN_STATE_MASK);
463 dev->features = lowerdev->features & MACVLAN_FEATURES;
464 dev->features |= NETIF_F_LLTX;
465 dev->gso_max_size = lowerdev->gso_max_size;
466 dev->iflink = lowerdev->ifindex;
467 dev->hard_header_len = lowerdev->hard_header_len;
468
469 macvlan_set_lockdep_class(dev);
470
471 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
472 if (!vlan->pcpu_stats)
473 return -ENOMEM;
474
475 return 0;
476 }
477
478 static void macvlan_uninit(struct net_device *dev)
479 {
480 struct macvlan_dev *vlan = netdev_priv(dev);
481 struct macvlan_port *port = vlan->port;
482
483 free_percpu(vlan->pcpu_stats);
484
485 port->count -= 1;
486 if (!port->count)
487 macvlan_port_destroy(port->dev);
488 }
489
490 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
491 struct rtnl_link_stats64 *stats)
492 {
493 struct macvlan_dev *vlan = netdev_priv(dev);
494
495 if (vlan->pcpu_stats) {
496 struct macvlan_pcpu_stats *p;
497 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
498 u32 rx_errors = 0, tx_dropped = 0;
499 unsigned int start;
500 int i;
501
502 for_each_possible_cpu(i) {
503 p = per_cpu_ptr(vlan->pcpu_stats, i);
504 do {
505 start = u64_stats_fetch_begin_bh(&p->syncp);
506 rx_packets = p->rx_packets;
507 rx_bytes = p->rx_bytes;
508 rx_multicast = p->rx_multicast;
509 tx_packets = p->tx_packets;
510 tx_bytes = p->tx_bytes;
511 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
512
513 stats->rx_packets += rx_packets;
514 stats->rx_bytes += rx_bytes;
515 stats->multicast += rx_multicast;
516 stats->tx_packets += tx_packets;
517 stats->tx_bytes += tx_bytes;
518 /* rx_errors & tx_dropped are u32, updated
519 * without syncp protection.
520 */
521 rx_errors += p->rx_errors;
522 tx_dropped += p->tx_dropped;
523 }
524 stats->rx_errors = rx_errors;
525 stats->rx_dropped = rx_errors;
526 stats->tx_dropped = tx_dropped;
527 }
528 return stats;
529 }
530
531 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
532 unsigned short vid)
533 {
534 struct macvlan_dev *vlan = netdev_priv(dev);
535 struct net_device *lowerdev = vlan->lowerdev;
536
537 return vlan_vid_add(lowerdev, vid);
538 }
539
540 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
541 unsigned short vid)
542 {
543 struct macvlan_dev *vlan = netdev_priv(dev);
544 struct net_device *lowerdev = vlan->lowerdev;
545
546 vlan_vid_del(lowerdev, vid);
547 return 0;
548 }
549
550 static int macvlan_fdb_add(struct ndmsg *ndm,
551 struct net_device *dev,
552 unsigned char *addr,
553 u16 flags)
554 {
555 struct macvlan_dev *vlan = netdev_priv(dev);
556 int err = -EINVAL;
557
558 if (!vlan->port->passthru)
559 return -EOPNOTSUPP;
560
561 if (is_unicast_ether_addr(addr))
562 err = dev_uc_add_excl(dev, addr);
563 else if (is_multicast_ether_addr(addr))
564 err = dev_mc_add_excl(dev, addr);
565
566 return err;
567 }
568
569 static int macvlan_fdb_del(struct ndmsg *ndm,
570 struct net_device *dev,
571 unsigned char *addr)
572 {
573 struct macvlan_dev *vlan = netdev_priv(dev);
574 int err = -EINVAL;
575
576 if (!vlan->port->passthru)
577 return -EOPNOTSUPP;
578
579 if (is_unicast_ether_addr(addr))
580 err = dev_uc_del(dev, addr);
581 else if (is_multicast_ether_addr(addr))
582 err = dev_mc_del(dev, addr);
583
584 return err;
585 }
586
587 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
588 struct ethtool_drvinfo *drvinfo)
589 {
590 snprintf(drvinfo->driver, 32, "macvlan");
591 snprintf(drvinfo->version, 32, "0.1");
592 }
593
594 static int macvlan_ethtool_get_settings(struct net_device *dev,
595 struct ethtool_cmd *cmd)
596 {
597 const struct macvlan_dev *vlan = netdev_priv(dev);
598
599 return __ethtool_get_settings(vlan->lowerdev, cmd);
600 }
601
602 static const struct ethtool_ops macvlan_ethtool_ops = {
603 .get_link = ethtool_op_get_link,
604 .get_settings = macvlan_ethtool_get_settings,
605 .get_drvinfo = macvlan_ethtool_get_drvinfo,
606 };
607
608 static const struct net_device_ops macvlan_netdev_ops = {
609 .ndo_init = macvlan_init,
610 .ndo_uninit = macvlan_uninit,
611 .ndo_open = macvlan_open,
612 .ndo_stop = macvlan_stop,
613 .ndo_start_xmit = macvlan_start_xmit,
614 .ndo_change_mtu = macvlan_change_mtu,
615 .ndo_change_rx_flags = macvlan_change_rx_flags,
616 .ndo_set_mac_address = macvlan_set_mac_address,
617 .ndo_set_rx_mode = macvlan_set_mac_lists,
618 .ndo_get_stats64 = macvlan_dev_get_stats64,
619 .ndo_validate_addr = eth_validate_addr,
620 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
621 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
622 .ndo_fdb_add = macvlan_fdb_add,
623 .ndo_fdb_del = macvlan_fdb_del,
624 .ndo_fdb_dump = ndo_dflt_fdb_dump,
625 };
626
627 void macvlan_common_setup(struct net_device *dev)
628 {
629 ether_setup(dev);
630
631 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
632 dev->netdev_ops = &macvlan_netdev_ops;
633 dev->destructor = free_netdev;
634 dev->header_ops = &macvlan_hard_header_ops,
635 dev->ethtool_ops = &macvlan_ethtool_ops;
636 }
637 EXPORT_SYMBOL_GPL(macvlan_common_setup);
638
639 static void macvlan_setup(struct net_device *dev)
640 {
641 macvlan_common_setup(dev);
642 dev->tx_queue_len = 0;
643 }
644
645 static int macvlan_port_create(struct net_device *dev)
646 {
647 struct macvlan_port *port;
648 unsigned int i;
649 int err;
650
651 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
652 return -EINVAL;
653
654 port = kzalloc(sizeof(*port), GFP_KERNEL);
655 if (port == NULL)
656 return -ENOMEM;
657
658 port->passthru = false;
659 port->dev = dev;
660 INIT_LIST_HEAD(&port->vlans);
661 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
662 INIT_HLIST_HEAD(&port->vlan_hash[i]);
663
664 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
665 if (err)
666 kfree(port);
667 else
668 dev->priv_flags |= IFF_MACVLAN_PORT;
669 return err;
670 }
671
672 static void macvlan_port_destroy(struct net_device *dev)
673 {
674 struct macvlan_port *port = macvlan_port_get(dev);
675
676 dev->priv_flags &= ~IFF_MACVLAN_PORT;
677 netdev_rx_handler_unregister(dev);
678 kfree_rcu(port, rcu);
679 }
680
681 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
682 {
683 if (tb[IFLA_ADDRESS]) {
684 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
685 return -EINVAL;
686 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
687 return -EADDRNOTAVAIL;
688 }
689
690 if (data && data[IFLA_MACVLAN_MODE]) {
691 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
692 case MACVLAN_MODE_PRIVATE:
693 case MACVLAN_MODE_VEPA:
694 case MACVLAN_MODE_BRIDGE:
695 case MACVLAN_MODE_PASSTHRU:
696 break;
697 default:
698 return -EINVAL;
699 }
700 }
701 return 0;
702 }
703
704 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
705 struct nlattr *tb[], struct nlattr *data[],
706 int (*receive)(struct sk_buff *skb),
707 int (*forward)(struct net_device *dev,
708 struct sk_buff *skb))
709 {
710 struct macvlan_dev *vlan = netdev_priv(dev);
711 struct macvlan_port *port;
712 struct net_device *lowerdev;
713 int err;
714
715 if (!tb[IFLA_LINK])
716 return -EINVAL;
717
718 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
719 if (lowerdev == NULL)
720 return -ENODEV;
721
722 /* When creating macvlans on top of other macvlans - use
723 * the real device as the lowerdev.
724 */
725 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
726 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
727 lowerdev = lowervlan->lowerdev;
728 }
729
730 if (!tb[IFLA_MTU])
731 dev->mtu = lowerdev->mtu;
732 else if (dev->mtu > lowerdev->mtu)
733 return -EINVAL;
734
735 if (!tb[IFLA_ADDRESS])
736 eth_hw_addr_random(dev);
737
738 if (!macvlan_port_exists(lowerdev)) {
739 err = macvlan_port_create(lowerdev);
740 if (err < 0)
741 return err;
742 }
743 port = macvlan_port_get(lowerdev);
744
745 /* Only 1 macvlan device can be created in passthru mode */
746 if (port->passthru)
747 return -EINVAL;
748
749 vlan->lowerdev = lowerdev;
750 vlan->dev = dev;
751 vlan->port = port;
752 vlan->receive = receive;
753 vlan->forward = forward;
754
755 vlan->mode = MACVLAN_MODE_VEPA;
756 if (data && data[IFLA_MACVLAN_MODE])
757 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
758
759 if (data && data[IFLA_MACVLAN_FLAGS])
760 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
761
762 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
763 if (port->count)
764 return -EINVAL;
765 port->passthru = true;
766 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
767 }
768
769 port->count += 1;
770 err = register_netdevice(dev);
771 if (err < 0)
772 goto destroy_port;
773
774 list_add_tail(&vlan->list, &port->vlans);
775 netif_stacked_transfer_operstate(lowerdev, dev);
776
777 return 0;
778
779 destroy_port:
780 port->count -= 1;
781 if (!port->count)
782 macvlan_port_destroy(lowerdev);
783
784 return err;
785 }
786 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
787
788 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
789 struct nlattr *tb[], struct nlattr *data[])
790 {
791 return macvlan_common_newlink(src_net, dev, tb, data,
792 netif_rx,
793 dev_forward_skb);
794 }
795
796 void macvlan_dellink(struct net_device *dev, struct list_head *head)
797 {
798 struct macvlan_dev *vlan = netdev_priv(dev);
799
800 list_del(&vlan->list);
801 unregister_netdevice_queue(dev, head);
802 }
803 EXPORT_SYMBOL_GPL(macvlan_dellink);
804
805 static int macvlan_changelink(struct net_device *dev,
806 struct nlattr *tb[], struct nlattr *data[])
807 {
808 struct macvlan_dev *vlan = netdev_priv(dev);
809 if (data && data[IFLA_MACVLAN_MODE])
810 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
811 if (data && data[IFLA_MACVLAN_FLAGS]) {
812 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
813 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
814
815 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
816 dev_set_promiscuity(vlan->lowerdev, -1);
817 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
818 dev_set_promiscuity(vlan->lowerdev, 1);
819 vlan->flags = flags;
820 }
821 return 0;
822 }
823
824 static size_t macvlan_get_size(const struct net_device *dev)
825 {
826 return nla_total_size(4);
827 }
828
829 static int macvlan_fill_info(struct sk_buff *skb,
830 const struct net_device *dev)
831 {
832 struct macvlan_dev *vlan = netdev_priv(dev);
833
834 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
835 goto nla_put_failure;
836 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
837 goto nla_put_failure;
838 return 0;
839
840 nla_put_failure:
841 return -EMSGSIZE;
842 }
843
844 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
845 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
846 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
847 };
848
849 int macvlan_link_register(struct rtnl_link_ops *ops)
850 {
851 /* common fields */
852 ops->priv_size = sizeof(struct macvlan_dev);
853 ops->validate = macvlan_validate;
854 ops->maxtype = IFLA_MACVLAN_MAX;
855 ops->policy = macvlan_policy;
856 ops->changelink = macvlan_changelink;
857 ops->get_size = macvlan_get_size;
858 ops->fill_info = macvlan_fill_info;
859
860 return rtnl_link_register(ops);
861 };
862 EXPORT_SYMBOL_GPL(macvlan_link_register);
863
864 static struct rtnl_link_ops macvlan_link_ops = {
865 .kind = "macvlan",
866 .setup = macvlan_setup,
867 .newlink = macvlan_newlink,
868 .dellink = macvlan_dellink,
869 };
870
871 static int macvlan_device_event(struct notifier_block *unused,
872 unsigned long event, void *ptr)
873 {
874 struct net_device *dev = ptr;
875 struct macvlan_dev *vlan, *next;
876 struct macvlan_port *port;
877 LIST_HEAD(list_kill);
878
879 if (!macvlan_port_exists(dev))
880 return NOTIFY_DONE;
881
882 port = macvlan_port_get(dev);
883
884 switch (event) {
885 case NETDEV_CHANGE:
886 list_for_each_entry(vlan, &port->vlans, list)
887 netif_stacked_transfer_operstate(vlan->lowerdev,
888 vlan->dev);
889 break;
890 case NETDEV_FEAT_CHANGE:
891 list_for_each_entry(vlan, &port->vlans, list) {
892 vlan->dev->features = dev->features & MACVLAN_FEATURES;
893 vlan->dev->gso_max_size = dev->gso_max_size;
894 netdev_features_change(vlan->dev);
895 }
896 break;
897 case NETDEV_UNREGISTER:
898 /* twiddle thumbs on netns device moves */
899 if (dev->reg_state != NETREG_UNREGISTERING)
900 break;
901
902 list_for_each_entry_safe(vlan, next, &port->vlans, list)
903 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
904 unregister_netdevice_many(&list_kill);
905 list_del(&list_kill);
906 break;
907 case NETDEV_PRE_TYPE_CHANGE:
908 /* Forbid underlaying device to change its type. */
909 return NOTIFY_BAD;
910 }
911 return NOTIFY_DONE;
912 }
913
914 static struct notifier_block macvlan_notifier_block __read_mostly = {
915 .notifier_call = macvlan_device_event,
916 };
917
918 static int __init macvlan_init_module(void)
919 {
920 int err;
921
922 register_netdevice_notifier(&macvlan_notifier_block);
923
924 err = macvlan_link_register(&macvlan_link_ops);
925 if (err < 0)
926 goto err1;
927 return 0;
928 err1:
929 unregister_netdevice_notifier(&macvlan_notifier_block);
930 return err;
931 }
932
933 static void __exit macvlan_cleanup_module(void)
934 {
935 rtnl_link_unregister(&macvlan_link_ops);
936 unregister_netdevice_notifier(&macvlan_notifier_block);
937 }
938
939 module_init(macvlan_init_module);
940 module_exit(macvlan_cleanup_module);
941
942 MODULE_LICENSE("GPL");
943 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
944 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
945 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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