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Merge remote-tracking branch 'asoc/topic/arizona' into asoc-next
[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 <linux/hash.h>
33 #include <net/rtnetlink.h>
34 #include <net/xfrm.h>
35
36 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
37
38 struct macvlan_port {
39 struct net_device *dev;
40 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
41 struct list_head vlans;
42 struct rcu_head rcu;
43 bool passthru;
44 int count;
45 };
46
47 static void macvlan_port_destroy(struct net_device *dev);
48
49 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
50 {
51 return rcu_dereference(dev->rx_handler_data);
52 }
53
54 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
55 {
56 return rtnl_dereference(dev->rx_handler_data);
57 }
58
59 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
60
61 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
62 const unsigned char *addr)
63 {
64 struct macvlan_dev *vlan;
65
66 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
67 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
68 return vlan;
69 }
70 return NULL;
71 }
72
73 static void macvlan_hash_add(struct macvlan_dev *vlan)
74 {
75 struct macvlan_port *port = vlan->port;
76 const unsigned char *addr = vlan->dev->dev_addr;
77
78 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
79 }
80
81 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
82 {
83 hlist_del_rcu(&vlan->hlist);
84 if (sync)
85 synchronize_rcu();
86 }
87
88 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
89 const unsigned char *addr)
90 {
91 macvlan_hash_del(vlan, true);
92 /* Now that we are unhashed it is safe to change the device
93 * address without confusing packet delivery.
94 */
95 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
96 macvlan_hash_add(vlan);
97 }
98
99 static int macvlan_addr_busy(const struct macvlan_port *port,
100 const unsigned char *addr)
101 {
102 /* Test to see if the specified multicast address is
103 * currently in use by the underlying device or
104 * another macvlan.
105 */
106 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
107 return 1;
108
109 if (macvlan_hash_lookup(port, addr))
110 return 1;
111
112 return 0;
113 }
114
115
116 static int macvlan_broadcast_one(struct sk_buff *skb,
117 const struct macvlan_dev *vlan,
118 const struct ethhdr *eth, bool local)
119 {
120 struct net_device *dev = vlan->dev;
121 if (!skb)
122 return NET_RX_DROP;
123
124 if (local)
125 return vlan->forward(dev, skb);
126
127 skb->dev = dev;
128 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
129 skb->pkt_type = PACKET_BROADCAST;
130 else
131 skb->pkt_type = PACKET_MULTICAST;
132
133 return vlan->receive(skb);
134 }
135
136 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
137 {
138 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
139 }
140
141
142 static unsigned int mc_hash(const struct macvlan_dev *vlan,
143 const unsigned char *addr)
144 {
145 u32 val = __get_unaligned_cpu32(addr + 2);
146
147 val ^= macvlan_hash_mix(vlan);
148 return hash_32(val, MACVLAN_MC_FILTER_BITS);
149 }
150
151 static void macvlan_broadcast(struct sk_buff *skb,
152 const struct macvlan_port *port,
153 struct net_device *src,
154 enum macvlan_mode mode)
155 {
156 const struct ethhdr *eth = eth_hdr(skb);
157 const struct macvlan_dev *vlan;
158 struct sk_buff *nskb;
159 unsigned int i;
160 int err;
161 unsigned int hash;
162
163 if (skb->protocol == htons(ETH_P_PAUSE))
164 return;
165
166 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
167 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
168 if (vlan->dev == src || !(vlan->mode & mode))
169 continue;
170
171 hash = mc_hash(vlan, eth->h_dest);
172 if (!test_bit(hash, vlan->mc_filter))
173 continue;
174 nskb = skb_clone(skb, GFP_ATOMIC);
175 err = macvlan_broadcast_one(nskb, vlan, eth,
176 mode == MACVLAN_MODE_BRIDGE);
177 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
178 err == NET_RX_SUCCESS, 1);
179 }
180 }
181 }
182
183 /* called under rcu_read_lock() from netif_receive_skb */
184 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
185 {
186 struct macvlan_port *port;
187 struct sk_buff *skb = *pskb;
188 const struct ethhdr *eth = eth_hdr(skb);
189 const struct macvlan_dev *vlan;
190 const struct macvlan_dev *src;
191 struct net_device *dev;
192 unsigned int len = 0;
193 int ret = NET_RX_DROP;
194
195 port = macvlan_port_get_rcu(skb->dev);
196 if (is_multicast_ether_addr(eth->h_dest)) {
197 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
198 if (!skb)
199 return RX_HANDLER_CONSUMED;
200 eth = eth_hdr(skb);
201 src = macvlan_hash_lookup(port, eth->h_source);
202 if (!src)
203 /* frame comes from an external address */
204 macvlan_broadcast(skb, port, NULL,
205 MACVLAN_MODE_PRIVATE |
206 MACVLAN_MODE_VEPA |
207 MACVLAN_MODE_PASSTHRU|
208 MACVLAN_MODE_BRIDGE);
209 else if (src->mode == MACVLAN_MODE_VEPA)
210 /* flood to everyone except source */
211 macvlan_broadcast(skb, port, src->dev,
212 MACVLAN_MODE_VEPA |
213 MACVLAN_MODE_BRIDGE);
214 else if (src->mode == MACVLAN_MODE_BRIDGE)
215 /*
216 * flood only to VEPA ports, bridge ports
217 * already saw the frame on the way out.
218 */
219 macvlan_broadcast(skb, port, src->dev,
220 MACVLAN_MODE_VEPA);
221 else {
222 /* forward to original port. */
223 vlan = src;
224 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
225 goto out;
226 }
227
228 return RX_HANDLER_PASS;
229 }
230
231 if (port->passthru)
232 vlan = list_first_or_null_rcu(&port->vlans,
233 struct macvlan_dev, list);
234 else
235 vlan = macvlan_hash_lookup(port, eth->h_dest);
236 if (vlan == NULL)
237 return RX_HANDLER_PASS;
238
239 dev = vlan->dev;
240 if (unlikely(!(dev->flags & IFF_UP))) {
241 kfree_skb(skb);
242 return RX_HANDLER_CONSUMED;
243 }
244 len = skb->len + ETH_HLEN;
245 skb = skb_share_check(skb, GFP_ATOMIC);
246 if (!skb)
247 goto out;
248
249 skb->dev = dev;
250 skb->pkt_type = PACKET_HOST;
251
252 ret = vlan->receive(skb);
253
254 out:
255 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
256 return RX_HANDLER_CONSUMED;
257 }
258
259 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
260 {
261 const struct macvlan_dev *vlan = netdev_priv(dev);
262 const struct macvlan_port *port = vlan->port;
263 const struct macvlan_dev *dest;
264 __u8 ip_summed = skb->ip_summed;
265
266 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
267 const struct ethhdr *eth = (void *)skb->data;
268 skb->ip_summed = CHECKSUM_UNNECESSARY;
269
270 /* send to other bridge ports directly */
271 if (is_multicast_ether_addr(eth->h_dest)) {
272 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
273 goto xmit_world;
274 }
275
276 dest = macvlan_hash_lookup(port, eth->h_dest);
277 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
278 /* send to lowerdev first for its network taps */
279 dev_forward_skb(vlan->lowerdev, skb);
280
281 return NET_XMIT_SUCCESS;
282 }
283 }
284
285 xmit_world:
286 skb->ip_summed = ip_summed;
287 skb->dev = vlan->lowerdev;
288 return dev_queue_xmit(skb);
289 }
290
291 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
292 struct net_device *dev)
293 {
294 unsigned int len = skb->len;
295 int ret;
296 const struct macvlan_dev *vlan = netdev_priv(dev);
297
298 ret = macvlan_queue_xmit(skb, dev);
299 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
300 struct macvlan_pcpu_stats *pcpu_stats;
301
302 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
303 u64_stats_update_begin(&pcpu_stats->syncp);
304 pcpu_stats->tx_packets++;
305 pcpu_stats->tx_bytes += len;
306 u64_stats_update_end(&pcpu_stats->syncp);
307 } else {
308 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
309 }
310 return ret;
311 }
312 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
313
314 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
315 unsigned short type, const void *daddr,
316 const void *saddr, unsigned len)
317 {
318 const struct macvlan_dev *vlan = netdev_priv(dev);
319 struct net_device *lowerdev = vlan->lowerdev;
320
321 return dev_hard_header(skb, lowerdev, type, daddr,
322 saddr ? : dev->dev_addr, len);
323 }
324
325 static const struct header_ops macvlan_hard_header_ops = {
326 .create = macvlan_hard_header,
327 .rebuild = eth_rebuild_header,
328 .parse = eth_header_parse,
329 .cache = eth_header_cache,
330 .cache_update = eth_header_cache_update,
331 };
332
333 static int macvlan_open(struct net_device *dev)
334 {
335 struct macvlan_dev *vlan = netdev_priv(dev);
336 struct net_device *lowerdev = vlan->lowerdev;
337 int err;
338
339 if (vlan->port->passthru) {
340 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
341 err = dev_set_promiscuity(lowerdev, 1);
342 if (err < 0)
343 goto out;
344 }
345 goto hash_add;
346 }
347
348 err = -EBUSY;
349 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
350 goto out;
351
352 err = dev_uc_add(lowerdev, dev->dev_addr);
353 if (err < 0)
354 goto out;
355 if (dev->flags & IFF_ALLMULTI) {
356 err = dev_set_allmulti(lowerdev, 1);
357 if (err < 0)
358 goto del_unicast;
359 }
360
361 hash_add:
362 macvlan_hash_add(vlan);
363 return 0;
364
365 del_unicast:
366 dev_uc_del(lowerdev, dev->dev_addr);
367 out:
368 return err;
369 }
370
371 static int macvlan_stop(struct net_device *dev)
372 {
373 struct macvlan_dev *vlan = netdev_priv(dev);
374 struct net_device *lowerdev = vlan->lowerdev;
375
376 dev_uc_unsync(lowerdev, dev);
377 dev_mc_unsync(lowerdev, dev);
378
379 if (vlan->port->passthru) {
380 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
381 dev_set_promiscuity(lowerdev, -1);
382 goto hash_del;
383 }
384
385 if (dev->flags & IFF_ALLMULTI)
386 dev_set_allmulti(lowerdev, -1);
387
388 dev_uc_del(lowerdev, dev->dev_addr);
389
390 hash_del:
391 macvlan_hash_del(vlan, !dev->dismantle);
392 return 0;
393 }
394
395 static int macvlan_set_mac_address(struct net_device *dev, void *p)
396 {
397 struct macvlan_dev *vlan = netdev_priv(dev);
398 struct net_device *lowerdev = vlan->lowerdev;
399 struct sockaddr *addr = p;
400 int err;
401
402 if (!is_valid_ether_addr(addr->sa_data))
403 return -EADDRNOTAVAIL;
404
405 if (!(dev->flags & IFF_UP)) {
406 /* Just copy in the new address */
407 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
408 } else {
409 /* Rehash and update the device filters */
410 if (macvlan_addr_busy(vlan->port, addr->sa_data))
411 return -EBUSY;
412
413 err = dev_uc_add(lowerdev, addr->sa_data);
414 if (err)
415 return err;
416
417 dev_uc_del(lowerdev, dev->dev_addr);
418
419 macvlan_hash_change_addr(vlan, addr->sa_data);
420 }
421 return 0;
422 }
423
424 static void macvlan_change_rx_flags(struct net_device *dev, int change)
425 {
426 struct macvlan_dev *vlan = netdev_priv(dev);
427 struct net_device *lowerdev = vlan->lowerdev;
428
429 if (change & IFF_ALLMULTI)
430 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
431 }
432
433 static void macvlan_set_mac_lists(struct net_device *dev)
434 {
435 struct macvlan_dev *vlan = netdev_priv(dev);
436
437 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
438 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
439 } else {
440 struct netdev_hw_addr *ha;
441 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
442
443 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
444 netdev_for_each_mc_addr(ha, dev) {
445 __set_bit(mc_hash(vlan, ha->addr), filter);
446 }
447
448 __set_bit(mc_hash(vlan, dev->broadcast), filter);
449
450 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
451 }
452 dev_uc_sync(vlan->lowerdev, dev);
453 dev_mc_sync(vlan->lowerdev, dev);
454 }
455
456 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
457 {
458 struct macvlan_dev *vlan = netdev_priv(dev);
459
460 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
461 return -EINVAL;
462 dev->mtu = new_mtu;
463 return 0;
464 }
465
466 /*
467 * macvlan network devices have devices nesting below it and are a special
468 * "super class" of normal network devices; split their locks off into a
469 * separate class since they always nest.
470 */
471 static struct lock_class_key macvlan_netdev_xmit_lock_key;
472 static struct lock_class_key macvlan_netdev_addr_lock_key;
473
474 #define MACVLAN_FEATURES \
475 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
476 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
477 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
478 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
479
480 #define MACVLAN_STATE_MASK \
481 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
482
483 static void macvlan_set_lockdep_class_one(struct net_device *dev,
484 struct netdev_queue *txq,
485 void *_unused)
486 {
487 lockdep_set_class(&txq->_xmit_lock,
488 &macvlan_netdev_xmit_lock_key);
489 }
490
491 static void macvlan_set_lockdep_class(struct net_device *dev)
492 {
493 lockdep_set_class(&dev->addr_list_lock,
494 &macvlan_netdev_addr_lock_key);
495 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
496 }
497
498 static int macvlan_init(struct net_device *dev)
499 {
500 struct macvlan_dev *vlan = netdev_priv(dev);
501 const struct net_device *lowerdev = vlan->lowerdev;
502
503 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
504 (lowerdev->state & MACVLAN_STATE_MASK);
505 dev->features = lowerdev->features & MACVLAN_FEATURES;
506 dev->features |= NETIF_F_LLTX;
507 dev->gso_max_size = lowerdev->gso_max_size;
508 dev->iflink = lowerdev->ifindex;
509 dev->hard_header_len = lowerdev->hard_header_len;
510
511 macvlan_set_lockdep_class(dev);
512
513 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
514 if (!vlan->pcpu_stats)
515 return -ENOMEM;
516
517 return 0;
518 }
519
520 static void macvlan_uninit(struct net_device *dev)
521 {
522 struct macvlan_dev *vlan = netdev_priv(dev);
523 struct macvlan_port *port = vlan->port;
524
525 free_percpu(vlan->pcpu_stats);
526
527 port->count -= 1;
528 if (!port->count)
529 macvlan_port_destroy(port->dev);
530 }
531
532 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
533 struct rtnl_link_stats64 *stats)
534 {
535 struct macvlan_dev *vlan = netdev_priv(dev);
536
537 if (vlan->pcpu_stats) {
538 struct macvlan_pcpu_stats *p;
539 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
540 u32 rx_errors = 0, tx_dropped = 0;
541 unsigned int start;
542 int i;
543
544 for_each_possible_cpu(i) {
545 p = per_cpu_ptr(vlan->pcpu_stats, i);
546 do {
547 start = u64_stats_fetch_begin_bh(&p->syncp);
548 rx_packets = p->rx_packets;
549 rx_bytes = p->rx_bytes;
550 rx_multicast = p->rx_multicast;
551 tx_packets = p->tx_packets;
552 tx_bytes = p->tx_bytes;
553 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
554
555 stats->rx_packets += rx_packets;
556 stats->rx_bytes += rx_bytes;
557 stats->multicast += rx_multicast;
558 stats->tx_packets += tx_packets;
559 stats->tx_bytes += tx_bytes;
560 /* rx_errors & tx_dropped are u32, updated
561 * without syncp protection.
562 */
563 rx_errors += p->rx_errors;
564 tx_dropped += p->tx_dropped;
565 }
566 stats->rx_errors = rx_errors;
567 stats->rx_dropped = rx_errors;
568 stats->tx_dropped = tx_dropped;
569 }
570 return stats;
571 }
572
573 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
574 __be16 proto, u16 vid)
575 {
576 struct macvlan_dev *vlan = netdev_priv(dev);
577 struct net_device *lowerdev = vlan->lowerdev;
578
579 return vlan_vid_add(lowerdev, proto, vid);
580 }
581
582 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
583 __be16 proto, u16 vid)
584 {
585 struct macvlan_dev *vlan = netdev_priv(dev);
586 struct net_device *lowerdev = vlan->lowerdev;
587
588 vlan_vid_del(lowerdev, proto, vid);
589 return 0;
590 }
591
592 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
593 struct net_device *dev,
594 const unsigned char *addr,
595 u16 flags)
596 {
597 struct macvlan_dev *vlan = netdev_priv(dev);
598 int err = -EINVAL;
599
600 if (!vlan->port->passthru)
601 return -EOPNOTSUPP;
602
603 if (is_unicast_ether_addr(addr))
604 err = dev_uc_add_excl(dev, addr);
605 else if (is_multicast_ether_addr(addr))
606 err = dev_mc_add_excl(dev, addr);
607
608 return err;
609 }
610
611 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
612 struct net_device *dev,
613 const unsigned char *addr)
614 {
615 struct macvlan_dev *vlan = netdev_priv(dev);
616 int err = -EINVAL;
617
618 if (!vlan->port->passthru)
619 return -EOPNOTSUPP;
620
621 if (is_unicast_ether_addr(addr))
622 err = dev_uc_del(dev, addr);
623 else if (is_multicast_ether_addr(addr))
624 err = dev_mc_del(dev, addr);
625
626 return err;
627 }
628
629 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
630 struct ethtool_drvinfo *drvinfo)
631 {
632 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
633 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
634 }
635
636 static int macvlan_ethtool_get_settings(struct net_device *dev,
637 struct ethtool_cmd *cmd)
638 {
639 const struct macvlan_dev *vlan = netdev_priv(dev);
640
641 return __ethtool_get_settings(vlan->lowerdev, cmd);
642 }
643
644 static netdev_features_t macvlan_fix_features(struct net_device *dev,
645 netdev_features_t features)
646 {
647 struct macvlan_dev *vlan = netdev_priv(dev);
648
649 return features & (vlan->set_features | ~MACVLAN_FEATURES);
650 }
651
652 static const struct ethtool_ops macvlan_ethtool_ops = {
653 .get_link = ethtool_op_get_link,
654 .get_settings = macvlan_ethtool_get_settings,
655 .get_drvinfo = macvlan_ethtool_get_drvinfo,
656 };
657
658 static const struct net_device_ops macvlan_netdev_ops = {
659 .ndo_init = macvlan_init,
660 .ndo_uninit = macvlan_uninit,
661 .ndo_open = macvlan_open,
662 .ndo_stop = macvlan_stop,
663 .ndo_start_xmit = macvlan_start_xmit,
664 .ndo_change_mtu = macvlan_change_mtu,
665 .ndo_fix_features = macvlan_fix_features,
666 .ndo_change_rx_flags = macvlan_change_rx_flags,
667 .ndo_set_mac_address = macvlan_set_mac_address,
668 .ndo_set_rx_mode = macvlan_set_mac_lists,
669 .ndo_get_stats64 = macvlan_dev_get_stats64,
670 .ndo_validate_addr = eth_validate_addr,
671 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
672 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
673 .ndo_fdb_add = macvlan_fdb_add,
674 .ndo_fdb_del = macvlan_fdb_del,
675 .ndo_fdb_dump = ndo_dflt_fdb_dump,
676 };
677
678 void macvlan_common_setup(struct net_device *dev)
679 {
680 ether_setup(dev);
681
682 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
683 dev->priv_flags |= IFF_UNICAST_FLT;
684 dev->netdev_ops = &macvlan_netdev_ops;
685 dev->destructor = free_netdev;
686 dev->header_ops = &macvlan_hard_header_ops,
687 dev->ethtool_ops = &macvlan_ethtool_ops;
688 }
689 EXPORT_SYMBOL_GPL(macvlan_common_setup);
690
691 static void macvlan_setup(struct net_device *dev)
692 {
693 macvlan_common_setup(dev);
694 dev->tx_queue_len = 0;
695 }
696
697 static int macvlan_port_create(struct net_device *dev)
698 {
699 struct macvlan_port *port;
700 unsigned int i;
701 int err;
702
703 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
704 return -EINVAL;
705
706 port = kzalloc(sizeof(*port), GFP_KERNEL);
707 if (port == NULL)
708 return -ENOMEM;
709
710 port->passthru = false;
711 port->dev = dev;
712 INIT_LIST_HEAD(&port->vlans);
713 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
714 INIT_HLIST_HEAD(&port->vlan_hash[i]);
715
716 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
717 if (err)
718 kfree(port);
719 else
720 dev->priv_flags |= IFF_MACVLAN_PORT;
721 return err;
722 }
723
724 static void macvlan_port_destroy(struct net_device *dev)
725 {
726 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
727
728 dev->priv_flags &= ~IFF_MACVLAN_PORT;
729 netdev_rx_handler_unregister(dev);
730 kfree_rcu(port, rcu);
731 }
732
733 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
734 {
735 if (tb[IFLA_ADDRESS]) {
736 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
737 return -EINVAL;
738 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
739 return -EADDRNOTAVAIL;
740 }
741
742 if (data && data[IFLA_MACVLAN_FLAGS] &&
743 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
744 return -EINVAL;
745
746 if (data && data[IFLA_MACVLAN_MODE]) {
747 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
748 case MACVLAN_MODE_PRIVATE:
749 case MACVLAN_MODE_VEPA:
750 case MACVLAN_MODE_BRIDGE:
751 case MACVLAN_MODE_PASSTHRU:
752 break;
753 default:
754 return -EINVAL;
755 }
756 }
757 return 0;
758 }
759
760 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
761 struct nlattr *tb[], struct nlattr *data[],
762 int (*receive)(struct sk_buff *skb),
763 int (*forward)(struct net_device *dev,
764 struct sk_buff *skb))
765 {
766 struct macvlan_dev *vlan = netdev_priv(dev);
767 struct macvlan_port *port;
768 struct net_device *lowerdev;
769 int err;
770
771 if (!tb[IFLA_LINK])
772 return -EINVAL;
773
774 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
775 if (lowerdev == NULL)
776 return -ENODEV;
777
778 /* When creating macvlans on top of other macvlans - use
779 * the real device as the lowerdev.
780 */
781 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
782 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
783 lowerdev = lowervlan->lowerdev;
784 }
785
786 if (!tb[IFLA_MTU])
787 dev->mtu = lowerdev->mtu;
788 else if (dev->mtu > lowerdev->mtu)
789 return -EINVAL;
790
791 if (!tb[IFLA_ADDRESS])
792 eth_hw_addr_random(dev);
793
794 if (!macvlan_port_exists(lowerdev)) {
795 err = macvlan_port_create(lowerdev);
796 if (err < 0)
797 return err;
798 }
799 port = macvlan_port_get_rtnl(lowerdev);
800
801 /* Only 1 macvlan device can be created in passthru mode */
802 if (port->passthru)
803 return -EINVAL;
804
805 vlan->lowerdev = lowerdev;
806 vlan->dev = dev;
807 vlan->port = port;
808 vlan->receive = receive;
809 vlan->forward = forward;
810 vlan->set_features = MACVLAN_FEATURES;
811
812 vlan->mode = MACVLAN_MODE_VEPA;
813 if (data && data[IFLA_MACVLAN_MODE])
814 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
815
816 if (data && data[IFLA_MACVLAN_FLAGS])
817 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
818
819 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
820 if (port->count)
821 return -EINVAL;
822 port->passthru = true;
823 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
824 }
825
826 err = netdev_upper_dev_link(lowerdev, dev);
827 if (err)
828 goto destroy_port;
829
830 port->count += 1;
831 err = register_netdevice(dev);
832 if (err < 0)
833 goto upper_dev_unlink;
834
835 list_add_tail_rcu(&vlan->list, &port->vlans);
836 netif_stacked_transfer_operstate(lowerdev, dev);
837
838 return 0;
839
840 upper_dev_unlink:
841 netdev_upper_dev_unlink(lowerdev, dev);
842 destroy_port:
843 port->count -= 1;
844 if (!port->count)
845 macvlan_port_destroy(lowerdev);
846
847 return err;
848 }
849 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
850
851 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
852 struct nlattr *tb[], struct nlattr *data[])
853 {
854 return macvlan_common_newlink(src_net, dev, tb, data,
855 netif_rx,
856 dev_forward_skb);
857 }
858
859 void macvlan_dellink(struct net_device *dev, struct list_head *head)
860 {
861 struct macvlan_dev *vlan = netdev_priv(dev);
862
863 list_del_rcu(&vlan->list);
864 unregister_netdevice_queue(dev, head);
865 netdev_upper_dev_unlink(vlan->lowerdev, dev);
866 }
867 EXPORT_SYMBOL_GPL(macvlan_dellink);
868
869 static int macvlan_changelink(struct net_device *dev,
870 struct nlattr *tb[], struct nlattr *data[])
871 {
872 struct macvlan_dev *vlan = netdev_priv(dev);
873 enum macvlan_mode mode;
874 bool set_mode = false;
875
876 /* Validate mode, but don't set yet: setting flags may fail. */
877 if (data && data[IFLA_MACVLAN_MODE]) {
878 set_mode = true;
879 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
880 /* Passthrough mode can't be set or cleared dynamically */
881 if ((mode == MACVLAN_MODE_PASSTHRU) !=
882 (vlan->mode == MACVLAN_MODE_PASSTHRU))
883 return -EINVAL;
884 }
885
886 if (data && data[IFLA_MACVLAN_FLAGS]) {
887 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
888 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
889 if (vlan->port->passthru && promisc) {
890 int err;
891
892 if (flags & MACVLAN_FLAG_NOPROMISC)
893 err = dev_set_promiscuity(vlan->lowerdev, -1);
894 else
895 err = dev_set_promiscuity(vlan->lowerdev, 1);
896 if (err < 0)
897 return err;
898 }
899 vlan->flags = flags;
900 }
901 if (set_mode)
902 vlan->mode = mode;
903 return 0;
904 }
905
906 static size_t macvlan_get_size(const struct net_device *dev)
907 {
908 return (0
909 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
910 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
911 );
912 }
913
914 static int macvlan_fill_info(struct sk_buff *skb,
915 const struct net_device *dev)
916 {
917 struct macvlan_dev *vlan = netdev_priv(dev);
918
919 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
920 goto nla_put_failure;
921 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
922 goto nla_put_failure;
923 return 0;
924
925 nla_put_failure:
926 return -EMSGSIZE;
927 }
928
929 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
930 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
931 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
932 };
933
934 int macvlan_link_register(struct rtnl_link_ops *ops)
935 {
936 /* common fields */
937 ops->priv_size = sizeof(struct macvlan_dev);
938 ops->validate = macvlan_validate;
939 ops->maxtype = IFLA_MACVLAN_MAX;
940 ops->policy = macvlan_policy;
941 ops->changelink = macvlan_changelink;
942 ops->get_size = macvlan_get_size;
943 ops->fill_info = macvlan_fill_info;
944
945 return rtnl_link_register(ops);
946 };
947 EXPORT_SYMBOL_GPL(macvlan_link_register);
948
949 static struct rtnl_link_ops macvlan_link_ops = {
950 .kind = "macvlan",
951 .setup = macvlan_setup,
952 .newlink = macvlan_newlink,
953 .dellink = macvlan_dellink,
954 };
955
956 static int macvlan_device_event(struct notifier_block *unused,
957 unsigned long event, void *ptr)
958 {
959 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
960 struct macvlan_dev *vlan, *next;
961 struct macvlan_port *port;
962 LIST_HEAD(list_kill);
963
964 if (!macvlan_port_exists(dev))
965 return NOTIFY_DONE;
966
967 port = macvlan_port_get_rtnl(dev);
968
969 switch (event) {
970 case NETDEV_CHANGE:
971 list_for_each_entry(vlan, &port->vlans, list)
972 netif_stacked_transfer_operstate(vlan->lowerdev,
973 vlan->dev);
974 break;
975 case NETDEV_FEAT_CHANGE:
976 list_for_each_entry(vlan, &port->vlans, list) {
977 vlan->dev->features = dev->features & MACVLAN_FEATURES;
978 vlan->dev->gso_max_size = dev->gso_max_size;
979 netdev_features_change(vlan->dev);
980 }
981 break;
982 case NETDEV_UNREGISTER:
983 /* twiddle thumbs on netns device moves */
984 if (dev->reg_state != NETREG_UNREGISTERING)
985 break;
986
987 list_for_each_entry_safe(vlan, next, &port->vlans, list)
988 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
989 unregister_netdevice_many(&list_kill);
990 list_del(&list_kill);
991 break;
992 case NETDEV_PRE_TYPE_CHANGE:
993 /* Forbid underlaying device to change its type. */
994 return NOTIFY_BAD;
995 }
996 return NOTIFY_DONE;
997 }
998
999 static struct notifier_block macvlan_notifier_block __read_mostly = {
1000 .notifier_call = macvlan_device_event,
1001 };
1002
1003 static int __init macvlan_init_module(void)
1004 {
1005 int err;
1006
1007 register_netdevice_notifier(&macvlan_notifier_block);
1008
1009 err = macvlan_link_register(&macvlan_link_ops);
1010 if (err < 0)
1011 goto err1;
1012 return 0;
1013 err1:
1014 unregister_netdevice_notifier(&macvlan_notifier_block);
1015 return err;
1016 }
1017
1018 static void __exit macvlan_cleanup_module(void)
1019 {
1020 rtnl_link_unregister(&macvlan_link_ops);
1021 unregister_netdevice_notifier(&macvlan_notifier_block);
1022 }
1023
1024 module_init(macvlan_init_module);
1025 module_exit(macvlan_cleanup_module);
1026
1027 MODULE_LICENSE("GPL");
1028 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1029 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1030 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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