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net: Explicitly initialize u64_stats_sync structures for lockdep
[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
122 if (local)
123 return vlan->forward(dev, skb);
124
125 skb->dev = dev;
126 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
127 skb->pkt_type = PACKET_BROADCAST;
128 else
129 skb->pkt_type = PACKET_MULTICAST;
130
131 return vlan->receive(skb);
132 }
133
134 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
135 {
136 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
137 }
138
139
140 static unsigned int mc_hash(const struct macvlan_dev *vlan,
141 const unsigned char *addr)
142 {
143 u32 val = __get_unaligned_cpu32(addr + 2);
144
145 val ^= macvlan_hash_mix(vlan);
146 return hash_32(val, MACVLAN_MC_FILTER_BITS);
147 }
148
149 static void macvlan_broadcast(struct sk_buff *skb,
150 const struct macvlan_port *port,
151 struct net_device *src,
152 enum macvlan_mode mode)
153 {
154 const struct ethhdr *eth = eth_hdr(skb);
155 const struct macvlan_dev *vlan;
156 struct sk_buff *nskb;
157 unsigned int i;
158 int err;
159 unsigned int hash;
160
161 if (skb->protocol == htons(ETH_P_PAUSE))
162 return;
163
164 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
165 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
166 if (vlan->dev == src || !(vlan->mode & mode))
167 continue;
168
169 hash = mc_hash(vlan, eth->h_dest);
170 if (!test_bit(hash, vlan->mc_filter))
171 continue;
172
173 err = NET_RX_DROP;
174 nskb = skb_clone(skb, GFP_ATOMIC);
175 if (likely(nskb))
176 err = macvlan_broadcast_one(
177 nskb, vlan, eth,
178 mode == MACVLAN_MODE_BRIDGE);
179 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
180 err == NET_RX_SUCCESS, 1);
181 }
182 }
183 }
184
185 /* called under rcu_read_lock() from netif_receive_skb */
186 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
187 {
188 struct macvlan_port *port;
189 struct sk_buff *skb = *pskb;
190 const struct ethhdr *eth = eth_hdr(skb);
191 const struct macvlan_dev *vlan;
192 const struct macvlan_dev *src;
193 struct net_device *dev;
194 unsigned int len = 0;
195 int ret = NET_RX_DROP;
196
197 port = macvlan_port_get_rcu(skb->dev);
198 if (is_multicast_ether_addr(eth->h_dest)) {
199 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
200 if (!skb)
201 return RX_HANDLER_CONSUMED;
202 eth = eth_hdr(skb);
203 src = macvlan_hash_lookup(port, eth->h_source);
204 if (!src)
205 /* frame comes from an external address */
206 macvlan_broadcast(skb, port, NULL,
207 MACVLAN_MODE_PRIVATE |
208 MACVLAN_MODE_VEPA |
209 MACVLAN_MODE_PASSTHRU|
210 MACVLAN_MODE_BRIDGE);
211 else if (src->mode == MACVLAN_MODE_VEPA)
212 /* flood to everyone except source */
213 macvlan_broadcast(skb, port, src->dev,
214 MACVLAN_MODE_VEPA |
215 MACVLAN_MODE_BRIDGE);
216 else if (src->mode == MACVLAN_MODE_BRIDGE)
217 /*
218 * flood only to VEPA ports, bridge ports
219 * already saw the frame on the way out.
220 */
221 macvlan_broadcast(skb, port, src->dev,
222 MACVLAN_MODE_VEPA);
223 else {
224 /* forward to original port. */
225 vlan = src;
226 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
227 goto out;
228 }
229
230 return RX_HANDLER_PASS;
231 }
232
233 if (port->passthru)
234 vlan = list_first_or_null_rcu(&port->vlans,
235 struct macvlan_dev, list);
236 else
237 vlan = macvlan_hash_lookup(port, eth->h_dest);
238 if (vlan == NULL)
239 return RX_HANDLER_PASS;
240
241 dev = vlan->dev;
242 if (unlikely(!(dev->flags & IFF_UP))) {
243 kfree_skb(skb);
244 return RX_HANDLER_CONSUMED;
245 }
246 len = skb->len + ETH_HLEN;
247 skb = skb_share_check(skb, GFP_ATOMIC);
248 if (!skb)
249 goto out;
250
251 skb->dev = dev;
252 skb->pkt_type = PACKET_HOST;
253
254 ret = vlan->receive(skb);
255
256 out:
257 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
258 return RX_HANDLER_CONSUMED;
259 }
260
261 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
262 {
263 const struct macvlan_dev *vlan = netdev_priv(dev);
264 const struct macvlan_port *port = vlan->port;
265 const struct macvlan_dev *dest;
266 __u8 ip_summed = skb->ip_summed;
267
268 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
269 const struct ethhdr *eth = (void *)skb->data;
270 skb->ip_summed = CHECKSUM_UNNECESSARY;
271
272 /* send to other bridge ports directly */
273 if (is_multicast_ether_addr(eth->h_dest)) {
274 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
275 goto xmit_world;
276 }
277
278 dest = macvlan_hash_lookup(port, eth->h_dest);
279 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
280 /* send to lowerdev first for its network taps */
281 dev_forward_skb(vlan->lowerdev, skb);
282
283 return NET_XMIT_SUCCESS;
284 }
285 }
286
287 xmit_world:
288 skb->ip_summed = ip_summed;
289 skb->dev = vlan->lowerdev;
290 return dev_queue_xmit(skb);
291 }
292
293 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
294 struct net_device *dev)
295 {
296 unsigned int len = skb->len;
297 int ret;
298 const struct macvlan_dev *vlan = netdev_priv(dev);
299
300 ret = macvlan_queue_xmit(skb, dev);
301 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
302 struct macvlan_pcpu_stats *pcpu_stats;
303
304 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
305 u64_stats_update_begin(&pcpu_stats->syncp);
306 pcpu_stats->tx_packets++;
307 pcpu_stats->tx_bytes += len;
308 u64_stats_update_end(&pcpu_stats->syncp);
309 } else {
310 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
311 }
312 return ret;
313 }
314 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
315
316 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
317 unsigned short type, const void *daddr,
318 const void *saddr, unsigned len)
319 {
320 const struct macvlan_dev *vlan = netdev_priv(dev);
321 struct net_device *lowerdev = vlan->lowerdev;
322
323 return dev_hard_header(skb, lowerdev, type, daddr,
324 saddr ? : dev->dev_addr, len);
325 }
326
327 static const struct header_ops macvlan_hard_header_ops = {
328 .create = macvlan_hard_header,
329 .rebuild = eth_rebuild_header,
330 .parse = eth_header_parse,
331 .cache = eth_header_cache,
332 .cache_update = eth_header_cache_update,
333 };
334
335 static int macvlan_open(struct net_device *dev)
336 {
337 struct macvlan_dev *vlan = netdev_priv(dev);
338 struct net_device *lowerdev = vlan->lowerdev;
339 int err;
340
341 if (vlan->port->passthru) {
342 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
343 err = dev_set_promiscuity(lowerdev, 1);
344 if (err < 0)
345 goto out;
346 }
347 goto hash_add;
348 }
349
350 err = -EBUSY;
351 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
352 goto out;
353
354 err = dev_uc_add(lowerdev, dev->dev_addr);
355 if (err < 0)
356 goto out;
357 if (dev->flags & IFF_ALLMULTI) {
358 err = dev_set_allmulti(lowerdev, 1);
359 if (err < 0)
360 goto del_unicast;
361 }
362
363 hash_add:
364 macvlan_hash_add(vlan);
365 return 0;
366
367 del_unicast:
368 dev_uc_del(lowerdev, dev->dev_addr);
369 out:
370 return err;
371 }
372
373 static int macvlan_stop(struct net_device *dev)
374 {
375 struct macvlan_dev *vlan = netdev_priv(dev);
376 struct net_device *lowerdev = vlan->lowerdev;
377
378 dev_uc_unsync(lowerdev, dev);
379 dev_mc_unsync(lowerdev, dev);
380
381 if (vlan->port->passthru) {
382 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
383 dev_set_promiscuity(lowerdev, -1);
384 goto hash_del;
385 }
386
387 if (dev->flags & IFF_ALLMULTI)
388 dev_set_allmulti(lowerdev, -1);
389
390 dev_uc_del(lowerdev, dev->dev_addr);
391
392 hash_del:
393 macvlan_hash_del(vlan, !dev->dismantle);
394 return 0;
395 }
396
397 static int macvlan_set_mac_address(struct net_device *dev, void *p)
398 {
399 struct macvlan_dev *vlan = netdev_priv(dev);
400 struct net_device *lowerdev = vlan->lowerdev;
401 struct sockaddr *addr = p;
402 int err;
403
404 if (!is_valid_ether_addr(addr->sa_data))
405 return -EADDRNOTAVAIL;
406
407 if (!(dev->flags & IFF_UP)) {
408 /* Just copy in the new address */
409 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
410 } else {
411 /* Rehash and update the device filters */
412 if (macvlan_addr_busy(vlan->port, addr->sa_data))
413 return -EBUSY;
414
415 err = dev_uc_add(lowerdev, addr->sa_data);
416 if (err)
417 return err;
418
419 dev_uc_del(lowerdev, dev->dev_addr);
420
421 macvlan_hash_change_addr(vlan, addr->sa_data);
422 }
423 return 0;
424 }
425
426 static void macvlan_change_rx_flags(struct net_device *dev, int change)
427 {
428 struct macvlan_dev *vlan = netdev_priv(dev);
429 struct net_device *lowerdev = vlan->lowerdev;
430
431 if (change & IFF_ALLMULTI)
432 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
433 }
434
435 static void macvlan_set_mac_lists(struct net_device *dev)
436 {
437 struct macvlan_dev *vlan = netdev_priv(dev);
438
439 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
440 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
441 } else {
442 struct netdev_hw_addr *ha;
443 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
444
445 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
446 netdev_for_each_mc_addr(ha, dev) {
447 __set_bit(mc_hash(vlan, ha->addr), filter);
448 }
449
450 __set_bit(mc_hash(vlan, dev->broadcast), filter);
451
452 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
453 }
454 dev_uc_sync(vlan->lowerdev, dev);
455 dev_mc_sync(vlan->lowerdev, dev);
456 }
457
458 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
459 {
460 struct macvlan_dev *vlan = netdev_priv(dev);
461
462 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
463 return -EINVAL;
464 dev->mtu = new_mtu;
465 return 0;
466 }
467
468 /*
469 * macvlan network devices have devices nesting below it and are a special
470 * "super class" of normal network devices; split their locks off into a
471 * separate class since they always nest.
472 */
473 static struct lock_class_key macvlan_netdev_xmit_lock_key;
474 static struct lock_class_key macvlan_netdev_addr_lock_key;
475
476 #define MACVLAN_FEATURES \
477 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
478 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
479 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
480 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
481
482 #define MACVLAN_STATE_MASK \
483 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
484
485 static void macvlan_set_lockdep_class_one(struct net_device *dev,
486 struct netdev_queue *txq,
487 void *_unused)
488 {
489 lockdep_set_class(&txq->_xmit_lock,
490 &macvlan_netdev_xmit_lock_key);
491 }
492
493 static void macvlan_set_lockdep_class(struct net_device *dev)
494 {
495 lockdep_set_class(&dev->addr_list_lock,
496 &macvlan_netdev_addr_lock_key);
497 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
498 }
499
500 static int macvlan_init(struct net_device *dev)
501 {
502 struct macvlan_dev *vlan = netdev_priv(dev);
503 const struct net_device *lowerdev = vlan->lowerdev;
504 int i;
505
506 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
507 (lowerdev->state & MACVLAN_STATE_MASK);
508 dev->features = lowerdev->features & MACVLAN_FEATURES;
509 dev->features |= NETIF_F_LLTX;
510 dev->gso_max_size = lowerdev->gso_max_size;
511 dev->iflink = lowerdev->ifindex;
512 dev->hard_header_len = lowerdev->hard_header_len;
513
514 macvlan_set_lockdep_class(dev);
515
516 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
517 if (!vlan->pcpu_stats)
518 return -ENOMEM;
519
520 for_each_possible_cpu(i) {
521 struct macvlan_pcpu_stats *mvlstats;
522 mvlstats = per_cpu_ptr(vlan->pcpu_stats, i);
523 u64_stats_init(&mvlstats->syncp);
524 }
525
526 return 0;
527 }
528
529 static void macvlan_uninit(struct net_device *dev)
530 {
531 struct macvlan_dev *vlan = netdev_priv(dev);
532 struct macvlan_port *port = vlan->port;
533
534 free_percpu(vlan->pcpu_stats);
535
536 port->count -= 1;
537 if (!port->count)
538 macvlan_port_destroy(port->dev);
539 }
540
541 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
542 struct rtnl_link_stats64 *stats)
543 {
544 struct macvlan_dev *vlan = netdev_priv(dev);
545
546 if (vlan->pcpu_stats) {
547 struct macvlan_pcpu_stats *p;
548 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
549 u32 rx_errors = 0, tx_dropped = 0;
550 unsigned int start;
551 int i;
552
553 for_each_possible_cpu(i) {
554 p = per_cpu_ptr(vlan->pcpu_stats, i);
555 do {
556 start = u64_stats_fetch_begin_bh(&p->syncp);
557 rx_packets = p->rx_packets;
558 rx_bytes = p->rx_bytes;
559 rx_multicast = p->rx_multicast;
560 tx_packets = p->tx_packets;
561 tx_bytes = p->tx_bytes;
562 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
563
564 stats->rx_packets += rx_packets;
565 stats->rx_bytes += rx_bytes;
566 stats->multicast += rx_multicast;
567 stats->tx_packets += tx_packets;
568 stats->tx_bytes += tx_bytes;
569 /* rx_errors & tx_dropped are u32, updated
570 * without syncp protection.
571 */
572 rx_errors += p->rx_errors;
573 tx_dropped += p->tx_dropped;
574 }
575 stats->rx_errors = rx_errors;
576 stats->rx_dropped = rx_errors;
577 stats->tx_dropped = tx_dropped;
578 }
579 return stats;
580 }
581
582 static int macvlan_vlan_rx_add_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 return vlan_vid_add(lowerdev, proto, vid);
589 }
590
591 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
592 __be16 proto, u16 vid)
593 {
594 struct macvlan_dev *vlan = netdev_priv(dev);
595 struct net_device *lowerdev = vlan->lowerdev;
596
597 vlan_vid_del(lowerdev, proto, vid);
598 return 0;
599 }
600
601 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
602 struct net_device *dev,
603 const unsigned char *addr,
604 u16 flags)
605 {
606 struct macvlan_dev *vlan = netdev_priv(dev);
607 int err = -EINVAL;
608
609 if (!vlan->port->passthru)
610 return -EOPNOTSUPP;
611
612 if (flags & NLM_F_REPLACE)
613 return -EOPNOTSUPP;
614
615 if (is_unicast_ether_addr(addr))
616 err = dev_uc_add_excl(dev, addr);
617 else if (is_multicast_ether_addr(addr))
618 err = dev_mc_add_excl(dev, addr);
619
620 return err;
621 }
622
623 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
624 struct net_device *dev,
625 const unsigned char *addr)
626 {
627 struct macvlan_dev *vlan = netdev_priv(dev);
628 int err = -EINVAL;
629
630 if (!vlan->port->passthru)
631 return -EOPNOTSUPP;
632
633 if (is_unicast_ether_addr(addr))
634 err = dev_uc_del(dev, addr);
635 else if (is_multicast_ether_addr(addr))
636 err = dev_mc_del(dev, addr);
637
638 return err;
639 }
640
641 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
642 struct ethtool_drvinfo *drvinfo)
643 {
644 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
645 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
646 }
647
648 static int macvlan_ethtool_get_settings(struct net_device *dev,
649 struct ethtool_cmd *cmd)
650 {
651 const struct macvlan_dev *vlan = netdev_priv(dev);
652
653 return __ethtool_get_settings(vlan->lowerdev, cmd);
654 }
655
656 static netdev_features_t macvlan_fix_features(struct net_device *dev,
657 netdev_features_t features)
658 {
659 struct macvlan_dev *vlan = netdev_priv(dev);
660
661 return features & (vlan->set_features | ~MACVLAN_FEATURES);
662 }
663
664 static const struct ethtool_ops macvlan_ethtool_ops = {
665 .get_link = ethtool_op_get_link,
666 .get_settings = macvlan_ethtool_get_settings,
667 .get_drvinfo = macvlan_ethtool_get_drvinfo,
668 };
669
670 static const struct net_device_ops macvlan_netdev_ops = {
671 .ndo_init = macvlan_init,
672 .ndo_uninit = macvlan_uninit,
673 .ndo_open = macvlan_open,
674 .ndo_stop = macvlan_stop,
675 .ndo_start_xmit = macvlan_start_xmit,
676 .ndo_change_mtu = macvlan_change_mtu,
677 .ndo_fix_features = macvlan_fix_features,
678 .ndo_change_rx_flags = macvlan_change_rx_flags,
679 .ndo_set_mac_address = macvlan_set_mac_address,
680 .ndo_set_rx_mode = macvlan_set_mac_lists,
681 .ndo_get_stats64 = macvlan_dev_get_stats64,
682 .ndo_validate_addr = eth_validate_addr,
683 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
684 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
685 .ndo_fdb_add = macvlan_fdb_add,
686 .ndo_fdb_del = macvlan_fdb_del,
687 .ndo_fdb_dump = ndo_dflt_fdb_dump,
688 };
689
690 void macvlan_common_setup(struct net_device *dev)
691 {
692 ether_setup(dev);
693
694 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
695 dev->priv_flags |= IFF_UNICAST_FLT;
696 dev->netdev_ops = &macvlan_netdev_ops;
697 dev->destructor = free_netdev;
698 dev->header_ops = &macvlan_hard_header_ops;
699 dev->ethtool_ops = &macvlan_ethtool_ops;
700 }
701 EXPORT_SYMBOL_GPL(macvlan_common_setup);
702
703 static void macvlan_setup(struct net_device *dev)
704 {
705 macvlan_common_setup(dev);
706 dev->tx_queue_len = 0;
707 }
708
709 static int macvlan_port_create(struct net_device *dev)
710 {
711 struct macvlan_port *port;
712 unsigned int i;
713 int err;
714
715 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
716 return -EINVAL;
717
718 port = kzalloc(sizeof(*port), GFP_KERNEL);
719 if (port == NULL)
720 return -ENOMEM;
721
722 port->passthru = false;
723 port->dev = dev;
724 INIT_LIST_HEAD(&port->vlans);
725 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
726 INIT_HLIST_HEAD(&port->vlan_hash[i]);
727
728 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
729 if (err)
730 kfree(port);
731 else
732 dev->priv_flags |= IFF_MACVLAN_PORT;
733 return err;
734 }
735
736 static void macvlan_port_destroy(struct net_device *dev)
737 {
738 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
739
740 dev->priv_flags &= ~IFF_MACVLAN_PORT;
741 netdev_rx_handler_unregister(dev);
742 kfree_rcu(port, rcu);
743 }
744
745 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
746 {
747 if (tb[IFLA_ADDRESS]) {
748 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
749 return -EINVAL;
750 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
751 return -EADDRNOTAVAIL;
752 }
753
754 if (data && data[IFLA_MACVLAN_FLAGS] &&
755 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
756 return -EINVAL;
757
758 if (data && data[IFLA_MACVLAN_MODE]) {
759 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
760 case MACVLAN_MODE_PRIVATE:
761 case MACVLAN_MODE_VEPA:
762 case MACVLAN_MODE_BRIDGE:
763 case MACVLAN_MODE_PASSTHRU:
764 break;
765 default:
766 return -EINVAL;
767 }
768 }
769 return 0;
770 }
771
772 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
773 struct nlattr *tb[], struct nlattr *data[],
774 int (*receive)(struct sk_buff *skb),
775 int (*forward)(struct net_device *dev,
776 struct sk_buff *skb))
777 {
778 struct macvlan_dev *vlan = netdev_priv(dev);
779 struct macvlan_port *port;
780 struct net_device *lowerdev;
781 int err;
782
783 if (!tb[IFLA_LINK])
784 return -EINVAL;
785
786 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
787 if (lowerdev == NULL)
788 return -ENODEV;
789
790 /* When creating macvlans on top of other macvlans - use
791 * the real device as the lowerdev.
792 */
793 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
794 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
795 lowerdev = lowervlan->lowerdev;
796 }
797
798 if (!tb[IFLA_MTU])
799 dev->mtu = lowerdev->mtu;
800 else if (dev->mtu > lowerdev->mtu)
801 return -EINVAL;
802
803 if (!tb[IFLA_ADDRESS])
804 eth_hw_addr_random(dev);
805
806 if (!macvlan_port_exists(lowerdev)) {
807 err = macvlan_port_create(lowerdev);
808 if (err < 0)
809 return err;
810 }
811 port = macvlan_port_get_rtnl(lowerdev);
812
813 /* Only 1 macvlan device can be created in passthru mode */
814 if (port->passthru)
815 return -EINVAL;
816
817 vlan->lowerdev = lowerdev;
818 vlan->dev = dev;
819 vlan->port = port;
820 vlan->receive = receive;
821 vlan->forward = forward;
822 vlan->set_features = MACVLAN_FEATURES;
823
824 vlan->mode = MACVLAN_MODE_VEPA;
825 if (data && data[IFLA_MACVLAN_MODE])
826 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
827
828 if (data && data[IFLA_MACVLAN_FLAGS])
829 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
830
831 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
832 if (port->count)
833 return -EINVAL;
834 port->passthru = true;
835 eth_hw_addr_inherit(dev, lowerdev);
836 }
837
838 err = netdev_upper_dev_link(lowerdev, dev);
839 if (err)
840 goto destroy_port;
841
842 port->count += 1;
843 err = register_netdevice(dev);
844 if (err < 0)
845 goto upper_dev_unlink;
846
847 list_add_tail_rcu(&vlan->list, &port->vlans);
848 netif_stacked_transfer_operstate(lowerdev, dev);
849
850 return 0;
851
852 upper_dev_unlink:
853 netdev_upper_dev_unlink(lowerdev, dev);
854 destroy_port:
855 port->count -= 1;
856 if (!port->count)
857 macvlan_port_destroy(lowerdev);
858
859 return err;
860 }
861 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
862
863 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
864 struct nlattr *tb[], struct nlattr *data[])
865 {
866 return macvlan_common_newlink(src_net, dev, tb, data,
867 netif_rx,
868 dev_forward_skb);
869 }
870
871 void macvlan_dellink(struct net_device *dev, struct list_head *head)
872 {
873 struct macvlan_dev *vlan = netdev_priv(dev);
874
875 list_del_rcu(&vlan->list);
876 unregister_netdevice_queue(dev, head);
877 netdev_upper_dev_unlink(vlan->lowerdev, dev);
878 }
879 EXPORT_SYMBOL_GPL(macvlan_dellink);
880
881 static int macvlan_changelink(struct net_device *dev,
882 struct nlattr *tb[], struct nlattr *data[])
883 {
884 struct macvlan_dev *vlan = netdev_priv(dev);
885 enum macvlan_mode mode;
886 bool set_mode = false;
887
888 /* Validate mode, but don't set yet: setting flags may fail. */
889 if (data && data[IFLA_MACVLAN_MODE]) {
890 set_mode = true;
891 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
892 /* Passthrough mode can't be set or cleared dynamically */
893 if ((mode == MACVLAN_MODE_PASSTHRU) !=
894 (vlan->mode == MACVLAN_MODE_PASSTHRU))
895 return -EINVAL;
896 }
897
898 if (data && data[IFLA_MACVLAN_FLAGS]) {
899 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
900 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
901 if (vlan->port->passthru && promisc) {
902 int err;
903
904 if (flags & MACVLAN_FLAG_NOPROMISC)
905 err = dev_set_promiscuity(vlan->lowerdev, -1);
906 else
907 err = dev_set_promiscuity(vlan->lowerdev, 1);
908 if (err < 0)
909 return err;
910 }
911 vlan->flags = flags;
912 }
913 if (set_mode)
914 vlan->mode = mode;
915 return 0;
916 }
917
918 static size_t macvlan_get_size(const struct net_device *dev)
919 {
920 return (0
921 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
922 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
923 );
924 }
925
926 static int macvlan_fill_info(struct sk_buff *skb,
927 const struct net_device *dev)
928 {
929 struct macvlan_dev *vlan = netdev_priv(dev);
930
931 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
932 goto nla_put_failure;
933 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
934 goto nla_put_failure;
935 return 0;
936
937 nla_put_failure:
938 return -EMSGSIZE;
939 }
940
941 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
942 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
943 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
944 };
945
946 int macvlan_link_register(struct rtnl_link_ops *ops)
947 {
948 /* common fields */
949 ops->priv_size = sizeof(struct macvlan_dev);
950 ops->validate = macvlan_validate;
951 ops->maxtype = IFLA_MACVLAN_MAX;
952 ops->policy = macvlan_policy;
953 ops->changelink = macvlan_changelink;
954 ops->get_size = macvlan_get_size;
955 ops->fill_info = macvlan_fill_info;
956
957 return rtnl_link_register(ops);
958 };
959 EXPORT_SYMBOL_GPL(macvlan_link_register);
960
961 static struct rtnl_link_ops macvlan_link_ops = {
962 .kind = "macvlan",
963 .setup = macvlan_setup,
964 .newlink = macvlan_newlink,
965 .dellink = macvlan_dellink,
966 };
967
968 static int macvlan_device_event(struct notifier_block *unused,
969 unsigned long event, void *ptr)
970 {
971 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
972 struct macvlan_dev *vlan, *next;
973 struct macvlan_port *port;
974 LIST_HEAD(list_kill);
975
976 if (!macvlan_port_exists(dev))
977 return NOTIFY_DONE;
978
979 port = macvlan_port_get_rtnl(dev);
980
981 switch (event) {
982 case NETDEV_CHANGE:
983 list_for_each_entry(vlan, &port->vlans, list)
984 netif_stacked_transfer_operstate(vlan->lowerdev,
985 vlan->dev);
986 break;
987 case NETDEV_FEAT_CHANGE:
988 list_for_each_entry(vlan, &port->vlans, list) {
989 vlan->dev->features = dev->features & MACVLAN_FEATURES;
990 vlan->dev->gso_max_size = dev->gso_max_size;
991 netdev_features_change(vlan->dev);
992 }
993 break;
994 case NETDEV_UNREGISTER:
995 /* twiddle thumbs on netns device moves */
996 if (dev->reg_state != NETREG_UNREGISTERING)
997 break;
998
999 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1000 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1001 unregister_netdevice_many(&list_kill);
1002 list_del(&list_kill);
1003 break;
1004 case NETDEV_PRE_TYPE_CHANGE:
1005 /* Forbid underlaying device to change its type. */
1006 return NOTIFY_BAD;
1007 }
1008 return NOTIFY_DONE;
1009 }
1010
1011 static struct notifier_block macvlan_notifier_block __read_mostly = {
1012 .notifier_call = macvlan_device_event,
1013 };
1014
1015 static int __init macvlan_init_module(void)
1016 {
1017 int err;
1018
1019 register_netdevice_notifier(&macvlan_notifier_block);
1020
1021 err = macvlan_link_register(&macvlan_link_ops);
1022 if (err < 0)
1023 goto err1;
1024 return 0;
1025 err1:
1026 unregister_netdevice_notifier(&macvlan_notifier_block);
1027 return err;
1028 }
1029
1030 static void __exit macvlan_cleanup_module(void)
1031 {
1032 rtnl_link_unregister(&macvlan_link_ops);
1033 unregister_netdevice_notifier(&macvlan_notifier_block);
1034 }
1035
1036 module_init(macvlan_init_module);
1037 module_exit(macvlan_cleanup_module);
1038
1039 MODULE_LICENSE("GPL");
1040 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1041 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1042 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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