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Merge remote-tracking branch 'spi/fix/grant' into spi-linus
[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_entry(&port->vlans, struct macvlan_dev, list);
233 else
234 vlan = macvlan_hash_lookup(port, eth->h_dest);
235 if (vlan == NULL)
236 return RX_HANDLER_PASS;
237
238 dev = vlan->dev;
239 if (unlikely(!(dev->flags & IFF_UP))) {
240 kfree_skb(skb);
241 return RX_HANDLER_CONSUMED;
242 }
243 len = skb->len + ETH_HLEN;
244 skb = skb_share_check(skb, GFP_ATOMIC);
245 if (!skb)
246 goto out;
247
248 skb->dev = dev;
249 skb->pkt_type = PACKET_HOST;
250
251 ret = vlan->receive(skb);
252
253 out:
254 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
255 return RX_HANDLER_CONSUMED;
256 }
257
258 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
259 {
260 const struct macvlan_dev *vlan = netdev_priv(dev);
261 const struct macvlan_port *port = vlan->port;
262 const struct macvlan_dev *dest;
263 __u8 ip_summed = skb->ip_summed;
264
265 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
266 const struct ethhdr *eth = (void *)skb->data;
267 skb->ip_summed = CHECKSUM_UNNECESSARY;
268
269 /* send to other bridge ports directly */
270 if (is_multicast_ether_addr(eth->h_dest)) {
271 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
272 goto xmit_world;
273 }
274
275 dest = macvlan_hash_lookup(port, eth->h_dest);
276 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
277 /* send to lowerdev first for its network taps */
278 dev_forward_skb(vlan->lowerdev, skb);
279
280 return NET_XMIT_SUCCESS;
281 }
282 }
283
284 xmit_world:
285 skb->ip_summed = ip_summed;
286 skb->dev = vlan->lowerdev;
287 return dev_queue_xmit(skb);
288 }
289
290 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
291 struct net_device *dev)
292 {
293 unsigned int len = skb->len;
294 int ret;
295 const struct macvlan_dev *vlan = netdev_priv(dev);
296
297 ret = macvlan_queue_xmit(skb, dev);
298 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
299 struct macvlan_pcpu_stats *pcpu_stats;
300
301 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
302 u64_stats_update_begin(&pcpu_stats->syncp);
303 pcpu_stats->tx_packets++;
304 pcpu_stats->tx_bytes += len;
305 u64_stats_update_end(&pcpu_stats->syncp);
306 } else {
307 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
308 }
309 return ret;
310 }
311 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
312
313 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
314 unsigned short type, const void *daddr,
315 const void *saddr, unsigned len)
316 {
317 const struct macvlan_dev *vlan = netdev_priv(dev);
318 struct net_device *lowerdev = vlan->lowerdev;
319
320 return dev_hard_header(skb, lowerdev, type, daddr,
321 saddr ? : dev->dev_addr, len);
322 }
323
324 static const struct header_ops macvlan_hard_header_ops = {
325 .create = macvlan_hard_header,
326 .rebuild = eth_rebuild_header,
327 .parse = eth_header_parse,
328 .cache = eth_header_cache,
329 .cache_update = eth_header_cache_update,
330 };
331
332 static int macvlan_open(struct net_device *dev)
333 {
334 struct macvlan_dev *vlan = netdev_priv(dev);
335 struct net_device *lowerdev = vlan->lowerdev;
336 int err;
337
338 if (vlan->port->passthru) {
339 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
340 dev_set_promiscuity(lowerdev, 1);
341 goto hash_add;
342 }
343
344 err = -EBUSY;
345 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
346 goto out;
347
348 err = dev_uc_add(lowerdev, dev->dev_addr);
349 if (err < 0)
350 goto out;
351 if (dev->flags & IFF_ALLMULTI) {
352 err = dev_set_allmulti(lowerdev, 1);
353 if (err < 0)
354 goto del_unicast;
355 }
356
357 hash_add:
358 macvlan_hash_add(vlan);
359 return 0;
360
361 del_unicast:
362 dev_uc_del(lowerdev, dev->dev_addr);
363 out:
364 return err;
365 }
366
367 static int macvlan_stop(struct net_device *dev)
368 {
369 struct macvlan_dev *vlan = netdev_priv(dev);
370 struct net_device *lowerdev = vlan->lowerdev;
371
372 dev_uc_unsync(lowerdev, dev);
373 dev_mc_unsync(lowerdev, dev);
374
375 if (vlan->port->passthru) {
376 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
377 dev_set_promiscuity(lowerdev, -1);
378 goto hash_del;
379 }
380
381 if (dev->flags & IFF_ALLMULTI)
382 dev_set_allmulti(lowerdev, -1);
383
384 dev_uc_del(lowerdev, dev->dev_addr);
385
386 hash_del:
387 macvlan_hash_del(vlan, !dev->dismantle);
388 return 0;
389 }
390
391 static int macvlan_set_mac_address(struct net_device *dev, void *p)
392 {
393 struct macvlan_dev *vlan = netdev_priv(dev);
394 struct net_device *lowerdev = vlan->lowerdev;
395 struct sockaddr *addr = p;
396 int err;
397
398 if (!is_valid_ether_addr(addr->sa_data))
399 return -EADDRNOTAVAIL;
400
401 if (!(dev->flags & IFF_UP)) {
402 /* Just copy in the new address */
403 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
404 } else {
405 /* Rehash and update the device filters */
406 if (macvlan_addr_busy(vlan->port, addr->sa_data))
407 return -EBUSY;
408
409 err = dev_uc_add(lowerdev, addr->sa_data);
410 if (err)
411 return err;
412
413 dev_uc_del(lowerdev, dev->dev_addr);
414
415 macvlan_hash_change_addr(vlan, addr->sa_data);
416 }
417 return 0;
418 }
419
420 static void macvlan_change_rx_flags(struct net_device *dev, int change)
421 {
422 struct macvlan_dev *vlan = netdev_priv(dev);
423 struct net_device *lowerdev = vlan->lowerdev;
424
425 if (change & IFF_ALLMULTI)
426 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
427 }
428
429 static void macvlan_set_mac_lists(struct net_device *dev)
430 {
431 struct macvlan_dev *vlan = netdev_priv(dev);
432
433 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
434 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
435 } else {
436 struct netdev_hw_addr *ha;
437 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
438
439 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
440 netdev_for_each_mc_addr(ha, dev) {
441 __set_bit(mc_hash(vlan, ha->addr), filter);
442 }
443
444 __set_bit(mc_hash(vlan, dev->broadcast), filter);
445
446 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
447 }
448 dev_uc_sync(vlan->lowerdev, dev);
449 dev_mc_sync(vlan->lowerdev, dev);
450 }
451
452 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
453 {
454 struct macvlan_dev *vlan = netdev_priv(dev);
455
456 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
457 return -EINVAL;
458 dev->mtu = new_mtu;
459 return 0;
460 }
461
462 /*
463 * macvlan network devices have devices nesting below it and are a special
464 * "super class" of normal network devices; split their locks off into a
465 * separate class since they always nest.
466 */
467 static struct lock_class_key macvlan_netdev_xmit_lock_key;
468 static struct lock_class_key macvlan_netdev_addr_lock_key;
469
470 #define MACVLAN_FEATURES \
471 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
472 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
473 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
474 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
475
476 #define MACVLAN_STATE_MASK \
477 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
478
479 static void macvlan_set_lockdep_class_one(struct net_device *dev,
480 struct netdev_queue *txq,
481 void *_unused)
482 {
483 lockdep_set_class(&txq->_xmit_lock,
484 &macvlan_netdev_xmit_lock_key);
485 }
486
487 static void macvlan_set_lockdep_class(struct net_device *dev)
488 {
489 lockdep_set_class(&dev->addr_list_lock,
490 &macvlan_netdev_addr_lock_key);
491 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
492 }
493
494 static int macvlan_init(struct net_device *dev)
495 {
496 struct macvlan_dev *vlan = netdev_priv(dev);
497 const struct net_device *lowerdev = vlan->lowerdev;
498
499 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
500 (lowerdev->state & MACVLAN_STATE_MASK);
501 dev->features = lowerdev->features & MACVLAN_FEATURES;
502 dev->features |= NETIF_F_LLTX;
503 dev->gso_max_size = lowerdev->gso_max_size;
504 dev->iflink = lowerdev->ifindex;
505 dev->hard_header_len = lowerdev->hard_header_len;
506
507 macvlan_set_lockdep_class(dev);
508
509 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
510 if (!vlan->pcpu_stats)
511 return -ENOMEM;
512
513 return 0;
514 }
515
516 static void macvlan_uninit(struct net_device *dev)
517 {
518 struct macvlan_dev *vlan = netdev_priv(dev);
519 struct macvlan_port *port = vlan->port;
520
521 free_percpu(vlan->pcpu_stats);
522
523 port->count -= 1;
524 if (!port->count)
525 macvlan_port_destroy(port->dev);
526 }
527
528 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
529 struct rtnl_link_stats64 *stats)
530 {
531 struct macvlan_dev *vlan = netdev_priv(dev);
532
533 if (vlan->pcpu_stats) {
534 struct macvlan_pcpu_stats *p;
535 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
536 u32 rx_errors = 0, tx_dropped = 0;
537 unsigned int start;
538 int i;
539
540 for_each_possible_cpu(i) {
541 p = per_cpu_ptr(vlan->pcpu_stats, i);
542 do {
543 start = u64_stats_fetch_begin_bh(&p->syncp);
544 rx_packets = p->rx_packets;
545 rx_bytes = p->rx_bytes;
546 rx_multicast = p->rx_multicast;
547 tx_packets = p->tx_packets;
548 tx_bytes = p->tx_bytes;
549 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
550
551 stats->rx_packets += rx_packets;
552 stats->rx_bytes += rx_bytes;
553 stats->multicast += rx_multicast;
554 stats->tx_packets += tx_packets;
555 stats->tx_bytes += tx_bytes;
556 /* rx_errors & tx_dropped are u32, updated
557 * without syncp protection.
558 */
559 rx_errors += p->rx_errors;
560 tx_dropped += p->tx_dropped;
561 }
562 stats->rx_errors = rx_errors;
563 stats->rx_dropped = rx_errors;
564 stats->tx_dropped = tx_dropped;
565 }
566 return stats;
567 }
568
569 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
570 __be16 proto, u16 vid)
571 {
572 struct macvlan_dev *vlan = netdev_priv(dev);
573 struct net_device *lowerdev = vlan->lowerdev;
574
575 return vlan_vid_add(lowerdev, proto, vid);
576 }
577
578 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
579 __be16 proto, u16 vid)
580 {
581 struct macvlan_dev *vlan = netdev_priv(dev);
582 struct net_device *lowerdev = vlan->lowerdev;
583
584 vlan_vid_del(lowerdev, proto, vid);
585 return 0;
586 }
587
588 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
589 struct net_device *dev,
590 const unsigned char *addr,
591 u16 flags)
592 {
593 struct macvlan_dev *vlan = netdev_priv(dev);
594 int err = -EINVAL;
595
596 if (!vlan->port->passthru)
597 return -EOPNOTSUPP;
598
599 if (is_unicast_ether_addr(addr))
600 err = dev_uc_add_excl(dev, addr);
601 else if (is_multicast_ether_addr(addr))
602 err = dev_mc_add_excl(dev, addr);
603
604 return err;
605 }
606
607 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
608 struct net_device *dev,
609 const unsigned char *addr)
610 {
611 struct macvlan_dev *vlan = netdev_priv(dev);
612 int err = -EINVAL;
613
614 if (!vlan->port->passthru)
615 return -EOPNOTSUPP;
616
617 if (is_unicast_ether_addr(addr))
618 err = dev_uc_del(dev, addr);
619 else if (is_multicast_ether_addr(addr))
620 err = dev_mc_del(dev, addr);
621
622 return err;
623 }
624
625 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
626 struct ethtool_drvinfo *drvinfo)
627 {
628 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
629 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
630 }
631
632 static int macvlan_ethtool_get_settings(struct net_device *dev,
633 struct ethtool_cmd *cmd)
634 {
635 const struct macvlan_dev *vlan = netdev_priv(dev);
636
637 return __ethtool_get_settings(vlan->lowerdev, cmd);
638 }
639
640 static const struct ethtool_ops macvlan_ethtool_ops = {
641 .get_link = ethtool_op_get_link,
642 .get_settings = macvlan_ethtool_get_settings,
643 .get_drvinfo = macvlan_ethtool_get_drvinfo,
644 };
645
646 static const struct net_device_ops macvlan_netdev_ops = {
647 .ndo_init = macvlan_init,
648 .ndo_uninit = macvlan_uninit,
649 .ndo_open = macvlan_open,
650 .ndo_stop = macvlan_stop,
651 .ndo_start_xmit = macvlan_start_xmit,
652 .ndo_change_mtu = macvlan_change_mtu,
653 .ndo_change_rx_flags = macvlan_change_rx_flags,
654 .ndo_set_mac_address = macvlan_set_mac_address,
655 .ndo_set_rx_mode = macvlan_set_mac_lists,
656 .ndo_get_stats64 = macvlan_dev_get_stats64,
657 .ndo_validate_addr = eth_validate_addr,
658 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
659 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
660 .ndo_fdb_add = macvlan_fdb_add,
661 .ndo_fdb_del = macvlan_fdb_del,
662 .ndo_fdb_dump = ndo_dflt_fdb_dump,
663 };
664
665 void macvlan_common_setup(struct net_device *dev)
666 {
667 ether_setup(dev);
668
669 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
670 dev->priv_flags |= IFF_UNICAST_FLT;
671 dev->netdev_ops = &macvlan_netdev_ops;
672 dev->destructor = free_netdev;
673 dev->header_ops = &macvlan_hard_header_ops,
674 dev->ethtool_ops = &macvlan_ethtool_ops;
675 }
676 EXPORT_SYMBOL_GPL(macvlan_common_setup);
677
678 static void macvlan_setup(struct net_device *dev)
679 {
680 macvlan_common_setup(dev);
681 dev->tx_queue_len = 0;
682 }
683
684 static int macvlan_port_create(struct net_device *dev)
685 {
686 struct macvlan_port *port;
687 unsigned int i;
688 int err;
689
690 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
691 return -EINVAL;
692
693 port = kzalloc(sizeof(*port), GFP_KERNEL);
694 if (port == NULL)
695 return -ENOMEM;
696
697 port->passthru = false;
698 port->dev = dev;
699 INIT_LIST_HEAD(&port->vlans);
700 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
701 INIT_HLIST_HEAD(&port->vlan_hash[i]);
702
703 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
704 if (err)
705 kfree(port);
706 else
707 dev->priv_flags |= IFF_MACVLAN_PORT;
708 return err;
709 }
710
711 static void macvlan_port_destroy(struct net_device *dev)
712 {
713 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
714
715 dev->priv_flags &= ~IFF_MACVLAN_PORT;
716 netdev_rx_handler_unregister(dev);
717 kfree_rcu(port, rcu);
718 }
719
720 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
721 {
722 if (tb[IFLA_ADDRESS]) {
723 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
724 return -EINVAL;
725 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
726 return -EADDRNOTAVAIL;
727 }
728
729 if (data && data[IFLA_MACVLAN_MODE]) {
730 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
731 case MACVLAN_MODE_PRIVATE:
732 case MACVLAN_MODE_VEPA:
733 case MACVLAN_MODE_BRIDGE:
734 case MACVLAN_MODE_PASSTHRU:
735 break;
736 default:
737 return -EINVAL;
738 }
739 }
740 return 0;
741 }
742
743 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
744 struct nlattr *tb[], struct nlattr *data[],
745 int (*receive)(struct sk_buff *skb),
746 int (*forward)(struct net_device *dev,
747 struct sk_buff *skb))
748 {
749 struct macvlan_dev *vlan = netdev_priv(dev);
750 struct macvlan_port *port;
751 struct net_device *lowerdev;
752 int err;
753
754 if (!tb[IFLA_LINK])
755 return -EINVAL;
756
757 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
758 if (lowerdev == NULL)
759 return -ENODEV;
760
761 /* When creating macvlans on top of other macvlans - use
762 * the real device as the lowerdev.
763 */
764 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
765 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
766 lowerdev = lowervlan->lowerdev;
767 }
768
769 if (!tb[IFLA_MTU])
770 dev->mtu = lowerdev->mtu;
771 else if (dev->mtu > lowerdev->mtu)
772 return -EINVAL;
773
774 if (!tb[IFLA_ADDRESS])
775 eth_hw_addr_random(dev);
776
777 if (!macvlan_port_exists(lowerdev)) {
778 err = macvlan_port_create(lowerdev);
779 if (err < 0)
780 return err;
781 }
782 port = macvlan_port_get_rtnl(lowerdev);
783
784 /* Only 1 macvlan device can be created in passthru mode */
785 if (port->passthru)
786 return -EINVAL;
787
788 vlan->lowerdev = lowerdev;
789 vlan->dev = dev;
790 vlan->port = port;
791 vlan->receive = receive;
792 vlan->forward = forward;
793
794 vlan->mode = MACVLAN_MODE_VEPA;
795 if (data && data[IFLA_MACVLAN_MODE])
796 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
797
798 if (data && data[IFLA_MACVLAN_FLAGS])
799 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
800
801 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
802 if (port->count)
803 return -EINVAL;
804 port->passthru = true;
805 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
806 }
807
808 err = netdev_upper_dev_link(lowerdev, dev);
809 if (err)
810 goto destroy_port;
811
812 port->count += 1;
813 err = register_netdevice(dev);
814 if (err < 0)
815 goto upper_dev_unlink;
816
817 list_add_tail(&vlan->list, &port->vlans);
818 netif_stacked_transfer_operstate(lowerdev, dev);
819
820 return 0;
821
822 upper_dev_unlink:
823 netdev_upper_dev_unlink(lowerdev, dev);
824 destroy_port:
825 port->count -= 1;
826 if (!port->count)
827 macvlan_port_destroy(lowerdev);
828
829 return err;
830 }
831 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
832
833 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
834 struct nlattr *tb[], struct nlattr *data[])
835 {
836 return macvlan_common_newlink(src_net, dev, tb, data,
837 netif_rx,
838 dev_forward_skb);
839 }
840
841 void macvlan_dellink(struct net_device *dev, struct list_head *head)
842 {
843 struct macvlan_dev *vlan = netdev_priv(dev);
844
845 list_del(&vlan->list);
846 unregister_netdevice_queue(dev, head);
847 netdev_upper_dev_unlink(vlan->lowerdev, dev);
848 }
849 EXPORT_SYMBOL_GPL(macvlan_dellink);
850
851 static int macvlan_changelink(struct net_device *dev,
852 struct nlattr *tb[], struct nlattr *data[])
853 {
854 struct macvlan_dev *vlan = netdev_priv(dev);
855 if (data && data[IFLA_MACVLAN_MODE])
856 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
857 if (data && data[IFLA_MACVLAN_FLAGS]) {
858 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
859 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
860
861 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
862 dev_set_promiscuity(vlan->lowerdev, -1);
863 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
864 dev_set_promiscuity(vlan->lowerdev, 1);
865 vlan->flags = flags;
866 }
867 return 0;
868 }
869
870 static size_t macvlan_get_size(const struct net_device *dev)
871 {
872 return (0
873 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
874 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
875 );
876 }
877
878 static int macvlan_fill_info(struct sk_buff *skb,
879 const struct net_device *dev)
880 {
881 struct macvlan_dev *vlan = netdev_priv(dev);
882
883 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
884 goto nla_put_failure;
885 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
886 goto nla_put_failure;
887 return 0;
888
889 nla_put_failure:
890 return -EMSGSIZE;
891 }
892
893 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
894 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
895 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
896 };
897
898 int macvlan_link_register(struct rtnl_link_ops *ops)
899 {
900 /* common fields */
901 ops->priv_size = sizeof(struct macvlan_dev);
902 ops->validate = macvlan_validate;
903 ops->maxtype = IFLA_MACVLAN_MAX;
904 ops->policy = macvlan_policy;
905 ops->changelink = macvlan_changelink;
906 ops->get_size = macvlan_get_size;
907 ops->fill_info = macvlan_fill_info;
908
909 return rtnl_link_register(ops);
910 };
911 EXPORT_SYMBOL_GPL(macvlan_link_register);
912
913 static struct rtnl_link_ops macvlan_link_ops = {
914 .kind = "macvlan",
915 .setup = macvlan_setup,
916 .newlink = macvlan_newlink,
917 .dellink = macvlan_dellink,
918 };
919
920 static int macvlan_device_event(struct notifier_block *unused,
921 unsigned long event, void *ptr)
922 {
923 struct net_device *dev = ptr;
924 struct macvlan_dev *vlan, *next;
925 struct macvlan_port *port;
926 LIST_HEAD(list_kill);
927
928 if (!macvlan_port_exists(dev))
929 return NOTIFY_DONE;
930
931 port = macvlan_port_get_rtnl(dev);
932
933 switch (event) {
934 case NETDEV_CHANGE:
935 list_for_each_entry(vlan, &port->vlans, list)
936 netif_stacked_transfer_operstate(vlan->lowerdev,
937 vlan->dev);
938 break;
939 case NETDEV_FEAT_CHANGE:
940 list_for_each_entry(vlan, &port->vlans, list) {
941 vlan->dev->features = dev->features & MACVLAN_FEATURES;
942 vlan->dev->gso_max_size = dev->gso_max_size;
943 netdev_features_change(vlan->dev);
944 }
945 break;
946 case NETDEV_UNREGISTER:
947 /* twiddle thumbs on netns device moves */
948 if (dev->reg_state != NETREG_UNREGISTERING)
949 break;
950
951 list_for_each_entry_safe(vlan, next, &port->vlans, list)
952 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
953 unregister_netdevice_many(&list_kill);
954 list_del(&list_kill);
955 break;
956 case NETDEV_PRE_TYPE_CHANGE:
957 /* Forbid underlaying device to change its type. */
958 return NOTIFY_BAD;
959 }
960 return NOTIFY_DONE;
961 }
962
963 static struct notifier_block macvlan_notifier_block __read_mostly = {
964 .notifier_call = macvlan_device_event,
965 };
966
967 static int __init macvlan_init_module(void)
968 {
969 int err;
970
971 register_netdevice_notifier(&macvlan_notifier_block);
972
973 err = macvlan_link_register(&macvlan_link_ops);
974 if (err < 0)
975 goto err1;
976 return 0;
977 err1:
978 unregister_netdevice_notifier(&macvlan_notifier_block);
979 return err;
980 }
981
982 static void __exit macvlan_cleanup_module(void)
983 {
984 rtnl_link_unregister(&macvlan_link_ops);
985 unregister_netdevice_notifier(&macvlan_notifier_block);
986 }
987
988 module_init(macvlan_init_module);
989 module_exit(macvlan_cleanup_module);
990
991 MODULE_LICENSE("GPL");
992 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
993 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
994 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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