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macvlan: unify macvlan_pcpu_stats and vlan_pcpu_stats
[people/arne_f/kernel.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 dev_forward_skb(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 netif_rx(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 = netif_rx(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 static 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 if (vlan->fwd_priv) {
301 skb->dev = vlan->lowerdev;
302 ret = dev_hard_start_xmit(skb, skb->dev, NULL, vlan->fwd_priv);
303 } else {
304 ret = macvlan_queue_xmit(skb, dev);
305 }
306
307 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
308 struct vlan_pcpu_stats *pcpu_stats;
309
310 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
311 u64_stats_update_begin(&pcpu_stats->syncp);
312 pcpu_stats->tx_packets++;
313 pcpu_stats->tx_bytes += len;
314 u64_stats_update_end(&pcpu_stats->syncp);
315 } else {
316 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
317 }
318 return ret;
319 }
320
321 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
322 unsigned short type, const void *daddr,
323 const void *saddr, unsigned len)
324 {
325 const struct macvlan_dev *vlan = netdev_priv(dev);
326 struct net_device *lowerdev = vlan->lowerdev;
327
328 return dev_hard_header(skb, lowerdev, type, daddr,
329 saddr ? : dev->dev_addr, len);
330 }
331
332 static const struct header_ops macvlan_hard_header_ops = {
333 .create = macvlan_hard_header,
334 .rebuild = eth_rebuild_header,
335 .parse = eth_header_parse,
336 .cache = eth_header_cache,
337 .cache_update = eth_header_cache_update,
338 };
339
340 static int macvlan_open(struct net_device *dev)
341 {
342 struct macvlan_dev *vlan = netdev_priv(dev);
343 struct net_device *lowerdev = vlan->lowerdev;
344 int err;
345
346 if (vlan->port->passthru) {
347 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
348 err = dev_set_promiscuity(lowerdev, 1);
349 if (err < 0)
350 goto out;
351 }
352 goto hash_add;
353 }
354
355 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) {
356 vlan->fwd_priv =
357 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
358
359 /* If we get a NULL pointer back, or if we get an error
360 * then we should just fall through to the non accelerated path
361 */
362 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
363 vlan->fwd_priv = NULL;
364 } else {
365 dev->features &= ~NETIF_F_LLTX;
366 return 0;
367 }
368 }
369
370 err = -EBUSY;
371 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
372 goto out;
373
374 err = dev_uc_add(lowerdev, dev->dev_addr);
375 if (err < 0)
376 goto out;
377 if (dev->flags & IFF_ALLMULTI) {
378 err = dev_set_allmulti(lowerdev, 1);
379 if (err < 0)
380 goto del_unicast;
381 }
382
383 hash_add:
384 macvlan_hash_add(vlan);
385 return 0;
386
387 del_unicast:
388 dev_uc_del(lowerdev, dev->dev_addr);
389 out:
390 if (vlan->fwd_priv) {
391 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
392 vlan->fwd_priv);
393 vlan->fwd_priv = NULL;
394 }
395 return err;
396 }
397
398 static int macvlan_stop(struct net_device *dev)
399 {
400 struct macvlan_dev *vlan = netdev_priv(dev);
401 struct net_device *lowerdev = vlan->lowerdev;
402
403 if (vlan->fwd_priv) {
404 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
405 vlan->fwd_priv);
406 vlan->fwd_priv = NULL;
407 return 0;
408 }
409
410 dev_uc_unsync(lowerdev, dev);
411 dev_mc_unsync(lowerdev, dev);
412
413 if (vlan->port->passthru) {
414 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
415 dev_set_promiscuity(lowerdev, -1);
416 goto hash_del;
417 }
418
419 if (dev->flags & IFF_ALLMULTI)
420 dev_set_allmulti(lowerdev, -1);
421
422 dev_uc_del(lowerdev, dev->dev_addr);
423
424 hash_del:
425 macvlan_hash_del(vlan, !dev->dismantle);
426 return 0;
427 }
428
429 static int macvlan_set_mac_address(struct net_device *dev, void *p)
430 {
431 struct macvlan_dev *vlan = netdev_priv(dev);
432 struct net_device *lowerdev = vlan->lowerdev;
433 struct sockaddr *addr = p;
434 int err;
435
436 if (!is_valid_ether_addr(addr->sa_data))
437 return -EADDRNOTAVAIL;
438
439 if (!(dev->flags & IFF_UP)) {
440 /* Just copy in the new address */
441 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
442 } else {
443 /* Rehash and update the device filters */
444 if (macvlan_addr_busy(vlan->port, addr->sa_data))
445 return -EBUSY;
446
447 err = dev_uc_add(lowerdev, addr->sa_data);
448 if (err)
449 return err;
450
451 dev_uc_del(lowerdev, dev->dev_addr);
452
453 macvlan_hash_change_addr(vlan, addr->sa_data);
454 }
455 return 0;
456 }
457
458 static void macvlan_change_rx_flags(struct net_device *dev, int change)
459 {
460 struct macvlan_dev *vlan = netdev_priv(dev);
461 struct net_device *lowerdev = vlan->lowerdev;
462
463 if (change & IFF_ALLMULTI)
464 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
465 }
466
467 static void macvlan_set_mac_lists(struct net_device *dev)
468 {
469 struct macvlan_dev *vlan = netdev_priv(dev);
470
471 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
472 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
473 } else {
474 struct netdev_hw_addr *ha;
475 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
476
477 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
478 netdev_for_each_mc_addr(ha, dev) {
479 __set_bit(mc_hash(vlan, ha->addr), filter);
480 }
481
482 __set_bit(mc_hash(vlan, dev->broadcast), filter);
483
484 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
485 }
486 dev_uc_sync(vlan->lowerdev, dev);
487 dev_mc_sync(vlan->lowerdev, dev);
488 }
489
490 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
491 {
492 struct macvlan_dev *vlan = netdev_priv(dev);
493
494 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
495 return -EINVAL;
496 dev->mtu = new_mtu;
497 return 0;
498 }
499
500 /*
501 * macvlan network devices have devices nesting below it and are a special
502 * "super class" of normal network devices; split their locks off into a
503 * separate class since they always nest.
504 */
505 static struct lock_class_key macvlan_netdev_xmit_lock_key;
506 static struct lock_class_key macvlan_netdev_addr_lock_key;
507
508 #define MACVLAN_FEATURES \
509 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
510 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
511 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
512 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
513
514 #define MACVLAN_STATE_MASK \
515 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
516
517 static void macvlan_set_lockdep_class_one(struct net_device *dev,
518 struct netdev_queue *txq,
519 void *_unused)
520 {
521 lockdep_set_class(&txq->_xmit_lock,
522 &macvlan_netdev_xmit_lock_key);
523 }
524
525 static void macvlan_set_lockdep_class(struct net_device *dev)
526 {
527 lockdep_set_class(&dev->addr_list_lock,
528 &macvlan_netdev_addr_lock_key);
529 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
530 }
531
532 static int macvlan_init(struct net_device *dev)
533 {
534 struct macvlan_dev *vlan = netdev_priv(dev);
535 const struct net_device *lowerdev = vlan->lowerdev;
536 int i;
537
538 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
539 (lowerdev->state & MACVLAN_STATE_MASK);
540 dev->features = lowerdev->features & MACVLAN_FEATURES;
541 dev->features |= NETIF_F_LLTX;
542 dev->gso_max_size = lowerdev->gso_max_size;
543 dev->iflink = lowerdev->ifindex;
544 dev->hard_header_len = lowerdev->hard_header_len;
545
546 macvlan_set_lockdep_class(dev);
547
548 vlan->pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
549 if (!vlan->pcpu_stats)
550 return -ENOMEM;
551
552 for_each_possible_cpu(i) {
553 struct vlan_pcpu_stats *mvlstats;
554 mvlstats = per_cpu_ptr(vlan->pcpu_stats, i);
555 u64_stats_init(&mvlstats->syncp);
556 }
557
558 return 0;
559 }
560
561 static void macvlan_uninit(struct net_device *dev)
562 {
563 struct macvlan_dev *vlan = netdev_priv(dev);
564 struct macvlan_port *port = vlan->port;
565
566 free_percpu(vlan->pcpu_stats);
567
568 port->count -= 1;
569 if (!port->count)
570 macvlan_port_destroy(port->dev);
571 }
572
573 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
574 struct rtnl_link_stats64 *stats)
575 {
576 struct macvlan_dev *vlan = netdev_priv(dev);
577
578 if (vlan->pcpu_stats) {
579 struct vlan_pcpu_stats *p;
580 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
581 u32 rx_errors = 0, tx_dropped = 0;
582 unsigned int start;
583 int i;
584
585 for_each_possible_cpu(i) {
586 p = per_cpu_ptr(vlan->pcpu_stats, i);
587 do {
588 start = u64_stats_fetch_begin_bh(&p->syncp);
589 rx_packets = p->rx_packets;
590 rx_bytes = p->rx_bytes;
591 rx_multicast = p->rx_multicast;
592 tx_packets = p->tx_packets;
593 tx_bytes = p->tx_bytes;
594 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
595
596 stats->rx_packets += rx_packets;
597 stats->rx_bytes += rx_bytes;
598 stats->multicast += rx_multicast;
599 stats->tx_packets += tx_packets;
600 stats->tx_bytes += tx_bytes;
601 /* rx_errors & tx_dropped are u32, updated
602 * without syncp protection.
603 */
604 rx_errors += p->rx_errors;
605 tx_dropped += p->tx_dropped;
606 }
607 stats->rx_errors = rx_errors;
608 stats->rx_dropped = rx_errors;
609 stats->tx_dropped = tx_dropped;
610 }
611 return stats;
612 }
613
614 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
615 __be16 proto, u16 vid)
616 {
617 struct macvlan_dev *vlan = netdev_priv(dev);
618 struct net_device *lowerdev = vlan->lowerdev;
619
620 return vlan_vid_add(lowerdev, proto, vid);
621 }
622
623 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
624 __be16 proto, u16 vid)
625 {
626 struct macvlan_dev *vlan = netdev_priv(dev);
627 struct net_device *lowerdev = vlan->lowerdev;
628
629 vlan_vid_del(lowerdev, proto, vid);
630 return 0;
631 }
632
633 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
634 struct net_device *dev,
635 const unsigned char *addr,
636 u16 flags)
637 {
638 struct macvlan_dev *vlan = netdev_priv(dev);
639 int err = -EINVAL;
640
641 if (!vlan->port->passthru)
642 return -EOPNOTSUPP;
643
644 if (flags & NLM_F_REPLACE)
645 return -EOPNOTSUPP;
646
647 if (is_unicast_ether_addr(addr))
648 err = dev_uc_add_excl(dev, addr);
649 else if (is_multicast_ether_addr(addr))
650 err = dev_mc_add_excl(dev, addr);
651
652 return err;
653 }
654
655 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
656 struct net_device *dev,
657 const unsigned char *addr)
658 {
659 struct macvlan_dev *vlan = netdev_priv(dev);
660 int err = -EINVAL;
661
662 if (!vlan->port->passthru)
663 return -EOPNOTSUPP;
664
665 if (is_unicast_ether_addr(addr))
666 err = dev_uc_del(dev, addr);
667 else if (is_multicast_ether_addr(addr))
668 err = dev_mc_del(dev, addr);
669
670 return err;
671 }
672
673 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
674 struct ethtool_drvinfo *drvinfo)
675 {
676 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
677 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
678 }
679
680 static int macvlan_ethtool_get_settings(struct net_device *dev,
681 struct ethtool_cmd *cmd)
682 {
683 const struct macvlan_dev *vlan = netdev_priv(dev);
684
685 return __ethtool_get_settings(vlan->lowerdev, cmd);
686 }
687
688 static netdev_features_t macvlan_fix_features(struct net_device *dev,
689 netdev_features_t features)
690 {
691 struct macvlan_dev *vlan = netdev_priv(dev);
692
693 return features & (vlan->set_features | ~MACVLAN_FEATURES);
694 }
695
696 static const struct ethtool_ops macvlan_ethtool_ops = {
697 .get_link = ethtool_op_get_link,
698 .get_settings = macvlan_ethtool_get_settings,
699 .get_drvinfo = macvlan_ethtool_get_drvinfo,
700 };
701
702 static const struct net_device_ops macvlan_netdev_ops = {
703 .ndo_init = macvlan_init,
704 .ndo_uninit = macvlan_uninit,
705 .ndo_open = macvlan_open,
706 .ndo_stop = macvlan_stop,
707 .ndo_start_xmit = macvlan_start_xmit,
708 .ndo_change_mtu = macvlan_change_mtu,
709 .ndo_fix_features = macvlan_fix_features,
710 .ndo_change_rx_flags = macvlan_change_rx_flags,
711 .ndo_set_mac_address = macvlan_set_mac_address,
712 .ndo_set_rx_mode = macvlan_set_mac_lists,
713 .ndo_get_stats64 = macvlan_dev_get_stats64,
714 .ndo_validate_addr = eth_validate_addr,
715 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
716 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
717 .ndo_fdb_add = macvlan_fdb_add,
718 .ndo_fdb_del = macvlan_fdb_del,
719 .ndo_fdb_dump = ndo_dflt_fdb_dump,
720 };
721
722 void macvlan_common_setup(struct net_device *dev)
723 {
724 ether_setup(dev);
725
726 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
727 dev->priv_flags |= IFF_UNICAST_FLT;
728 dev->netdev_ops = &macvlan_netdev_ops;
729 dev->destructor = free_netdev;
730 dev->header_ops = &macvlan_hard_header_ops;
731 dev->ethtool_ops = &macvlan_ethtool_ops;
732 }
733 EXPORT_SYMBOL_GPL(macvlan_common_setup);
734
735 static void macvlan_setup(struct net_device *dev)
736 {
737 macvlan_common_setup(dev);
738 dev->tx_queue_len = 0;
739 }
740
741 static int macvlan_port_create(struct net_device *dev)
742 {
743 struct macvlan_port *port;
744 unsigned int i;
745 int err;
746
747 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
748 return -EINVAL;
749
750 port = kzalloc(sizeof(*port), GFP_KERNEL);
751 if (port == NULL)
752 return -ENOMEM;
753
754 port->passthru = false;
755 port->dev = dev;
756 INIT_LIST_HEAD(&port->vlans);
757 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
758 INIT_HLIST_HEAD(&port->vlan_hash[i]);
759
760 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
761 if (err)
762 kfree(port);
763 else
764 dev->priv_flags |= IFF_MACVLAN_PORT;
765 return err;
766 }
767
768 static void macvlan_port_destroy(struct net_device *dev)
769 {
770 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
771
772 dev->priv_flags &= ~IFF_MACVLAN_PORT;
773 netdev_rx_handler_unregister(dev);
774 kfree_rcu(port, rcu);
775 }
776
777 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
778 {
779 if (tb[IFLA_ADDRESS]) {
780 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
781 return -EINVAL;
782 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
783 return -EADDRNOTAVAIL;
784 }
785
786 if (data && data[IFLA_MACVLAN_FLAGS] &&
787 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
788 return -EINVAL;
789
790 if (data && data[IFLA_MACVLAN_MODE]) {
791 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
792 case MACVLAN_MODE_PRIVATE:
793 case MACVLAN_MODE_VEPA:
794 case MACVLAN_MODE_BRIDGE:
795 case MACVLAN_MODE_PASSTHRU:
796 break;
797 default:
798 return -EINVAL;
799 }
800 }
801 return 0;
802 }
803
804 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
805 struct nlattr *tb[], struct nlattr *data[])
806 {
807 struct macvlan_dev *vlan = netdev_priv(dev);
808 struct macvlan_port *port;
809 struct net_device *lowerdev;
810 int err;
811
812 if (!tb[IFLA_LINK])
813 return -EINVAL;
814
815 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
816 if (lowerdev == NULL)
817 return -ENODEV;
818
819 /* When creating macvlans or macvtaps on top of other macvlans - use
820 * the real device as the lowerdev.
821 */
822 if (netif_is_macvlan(lowerdev))
823 lowerdev = macvlan_dev_real_dev(lowerdev);
824
825 if (!tb[IFLA_MTU])
826 dev->mtu = lowerdev->mtu;
827 else if (dev->mtu > lowerdev->mtu)
828 return -EINVAL;
829
830 if (!tb[IFLA_ADDRESS])
831 eth_hw_addr_random(dev);
832
833 if (!macvlan_port_exists(lowerdev)) {
834 err = macvlan_port_create(lowerdev);
835 if (err < 0)
836 return err;
837 }
838 port = macvlan_port_get_rtnl(lowerdev);
839
840 /* Only 1 macvlan device can be created in passthru mode */
841 if (port->passthru)
842 return -EINVAL;
843
844 vlan->lowerdev = lowerdev;
845 vlan->dev = dev;
846 vlan->port = port;
847 vlan->set_features = MACVLAN_FEATURES;
848
849 vlan->mode = MACVLAN_MODE_VEPA;
850 if (data && data[IFLA_MACVLAN_MODE])
851 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
852
853 if (data && data[IFLA_MACVLAN_FLAGS])
854 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
855
856 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
857 if (port->count)
858 return -EINVAL;
859 port->passthru = true;
860 eth_hw_addr_inherit(dev, lowerdev);
861 }
862
863 port->count += 1;
864 err = register_netdevice(dev);
865 if (err < 0)
866 goto destroy_port;
867
868 dev->priv_flags |= IFF_MACVLAN;
869 err = netdev_upper_dev_link(lowerdev, dev);
870 if (err)
871 goto destroy_port;
872
873
874 list_add_tail_rcu(&vlan->list, &port->vlans);
875 netif_stacked_transfer_operstate(lowerdev, dev);
876
877 return 0;
878
879 destroy_port:
880 port->count -= 1;
881 if (!port->count)
882 macvlan_port_destroy(lowerdev);
883
884 return err;
885 }
886 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
887
888 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
889 struct nlattr *tb[], struct nlattr *data[])
890 {
891 return macvlan_common_newlink(src_net, dev, tb, data);
892 }
893
894 void macvlan_dellink(struct net_device *dev, struct list_head *head)
895 {
896 struct macvlan_dev *vlan = netdev_priv(dev);
897
898 list_del_rcu(&vlan->list);
899 unregister_netdevice_queue(dev, head);
900 netdev_upper_dev_unlink(vlan->lowerdev, dev);
901 }
902 EXPORT_SYMBOL_GPL(macvlan_dellink);
903
904 static int macvlan_changelink(struct net_device *dev,
905 struct nlattr *tb[], struct nlattr *data[])
906 {
907 struct macvlan_dev *vlan = netdev_priv(dev);
908 enum macvlan_mode mode;
909 bool set_mode = false;
910
911 /* Validate mode, but don't set yet: setting flags may fail. */
912 if (data && data[IFLA_MACVLAN_MODE]) {
913 set_mode = true;
914 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
915 /* Passthrough mode can't be set or cleared dynamically */
916 if ((mode == MACVLAN_MODE_PASSTHRU) !=
917 (vlan->mode == MACVLAN_MODE_PASSTHRU))
918 return -EINVAL;
919 }
920
921 if (data && data[IFLA_MACVLAN_FLAGS]) {
922 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
923 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
924 if (vlan->port->passthru && promisc) {
925 int err;
926
927 if (flags & MACVLAN_FLAG_NOPROMISC)
928 err = dev_set_promiscuity(vlan->lowerdev, -1);
929 else
930 err = dev_set_promiscuity(vlan->lowerdev, 1);
931 if (err < 0)
932 return err;
933 }
934 vlan->flags = flags;
935 }
936 if (set_mode)
937 vlan->mode = mode;
938 return 0;
939 }
940
941 static size_t macvlan_get_size(const struct net_device *dev)
942 {
943 return (0
944 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
945 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
946 );
947 }
948
949 static int macvlan_fill_info(struct sk_buff *skb,
950 const struct net_device *dev)
951 {
952 struct macvlan_dev *vlan = netdev_priv(dev);
953
954 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
955 goto nla_put_failure;
956 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
957 goto nla_put_failure;
958 return 0;
959
960 nla_put_failure:
961 return -EMSGSIZE;
962 }
963
964 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
965 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
966 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
967 };
968
969 int macvlan_link_register(struct rtnl_link_ops *ops)
970 {
971 /* common fields */
972 ops->priv_size = sizeof(struct macvlan_dev);
973 ops->validate = macvlan_validate;
974 ops->maxtype = IFLA_MACVLAN_MAX;
975 ops->policy = macvlan_policy;
976 ops->changelink = macvlan_changelink;
977 ops->get_size = macvlan_get_size;
978 ops->fill_info = macvlan_fill_info;
979
980 return rtnl_link_register(ops);
981 };
982 EXPORT_SYMBOL_GPL(macvlan_link_register);
983
984 static struct rtnl_link_ops macvlan_link_ops = {
985 .kind = "macvlan",
986 .setup = macvlan_setup,
987 .newlink = macvlan_newlink,
988 .dellink = macvlan_dellink,
989 };
990
991 static int macvlan_device_event(struct notifier_block *unused,
992 unsigned long event, void *ptr)
993 {
994 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
995 struct macvlan_dev *vlan, *next;
996 struct macvlan_port *port;
997 LIST_HEAD(list_kill);
998
999 if (!macvlan_port_exists(dev))
1000 return NOTIFY_DONE;
1001
1002 port = macvlan_port_get_rtnl(dev);
1003
1004 switch (event) {
1005 case NETDEV_CHANGE:
1006 list_for_each_entry(vlan, &port->vlans, list)
1007 netif_stacked_transfer_operstate(vlan->lowerdev,
1008 vlan->dev);
1009 break;
1010 case NETDEV_FEAT_CHANGE:
1011 list_for_each_entry(vlan, &port->vlans, list) {
1012 vlan->dev->features = dev->features & MACVLAN_FEATURES;
1013 vlan->dev->gso_max_size = dev->gso_max_size;
1014 netdev_features_change(vlan->dev);
1015 }
1016 break;
1017 case NETDEV_UNREGISTER:
1018 /* twiddle thumbs on netns device moves */
1019 if (dev->reg_state != NETREG_UNREGISTERING)
1020 break;
1021
1022 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1023 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1024 unregister_netdevice_many(&list_kill);
1025 list_del(&list_kill);
1026 break;
1027 case NETDEV_PRE_TYPE_CHANGE:
1028 /* Forbid underlaying device to change its type. */
1029 return NOTIFY_BAD;
1030 }
1031 return NOTIFY_DONE;
1032 }
1033
1034 static struct notifier_block macvlan_notifier_block __read_mostly = {
1035 .notifier_call = macvlan_device_event,
1036 };
1037
1038 static int __init macvlan_init_module(void)
1039 {
1040 int err;
1041
1042 register_netdevice_notifier(&macvlan_notifier_block);
1043
1044 err = macvlan_link_register(&macvlan_link_ops);
1045 if (err < 0)
1046 goto err1;
1047 return 0;
1048 err1:
1049 unregister_netdevice_notifier(&macvlan_notifier_block);
1050 return err;
1051 }
1052
1053 static void __exit macvlan_cleanup_module(void)
1054 {
1055 rtnl_link_unregister(&macvlan_link_ops);
1056 unregister_netdevice_notifier(&macvlan_notifier_block);
1057 }
1058
1059 module_init(macvlan_init_module);
1060 module_exit(macvlan_cleanup_module);
1061
1062 MODULE_LICENSE("GPL");
1063 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1064 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1065 MODULE_ALIAS_RTNL_LINK("macvlan");
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