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macvlan: simplify the structure port
[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 <linux/workqueue.h>
34 #include <net/rtnetlink.h>
35 #include <net/xfrm.h>
36
37 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
38
39 struct macvlan_port {
40 struct net_device *dev;
41 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
42 struct list_head vlans;
43 struct rcu_head rcu;
44 struct sk_buff_head bc_queue;
45 struct work_struct bc_work;
46 bool passthru;
47 };
48
49 #define MACVLAN_PORT_IS_EMPTY(port) list_empty(&port->vlans)
50
51 struct macvlan_skb_cb {
52 const struct macvlan_dev *src;
53 };
54
55 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
56
57 static void macvlan_port_destroy(struct net_device *dev);
58
59 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
60 {
61 return rcu_dereference(dev->rx_handler_data);
62 }
63
64 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
65 {
66 return rtnl_dereference(dev->rx_handler_data);
67 }
68
69 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
70
71 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
72 const unsigned char *addr)
73 {
74 struct macvlan_dev *vlan;
75
76 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
77 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
78 return vlan;
79 }
80 return NULL;
81 }
82
83 static void macvlan_hash_add(struct macvlan_dev *vlan)
84 {
85 struct macvlan_port *port = vlan->port;
86 const unsigned char *addr = vlan->dev->dev_addr;
87
88 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
89 }
90
91 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
92 {
93 hlist_del_rcu(&vlan->hlist);
94 if (sync)
95 synchronize_rcu();
96 }
97
98 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
99 const unsigned char *addr)
100 {
101 macvlan_hash_del(vlan, true);
102 /* Now that we are unhashed it is safe to change the device
103 * address without confusing packet delivery.
104 */
105 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
106 macvlan_hash_add(vlan);
107 }
108
109 static int macvlan_addr_busy(const struct macvlan_port *port,
110 const unsigned char *addr)
111 {
112 /* Test to see if the specified multicast address is
113 * currently in use by the underlying device or
114 * another macvlan.
115 */
116 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
117 return 1;
118
119 if (macvlan_hash_lookup(port, addr))
120 return 1;
121
122 return 0;
123 }
124
125
126 static int macvlan_broadcast_one(struct sk_buff *skb,
127 const struct macvlan_dev *vlan,
128 const struct ethhdr *eth, bool local)
129 {
130 struct net_device *dev = vlan->dev;
131
132 if (local)
133 return __dev_forward_skb(dev, skb);
134
135 skb->dev = dev;
136 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
137 skb->pkt_type = PACKET_BROADCAST;
138 else
139 skb->pkt_type = PACKET_MULTICAST;
140
141 return 0;
142 }
143
144 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
145 {
146 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
147 }
148
149
150 static unsigned int mc_hash(const struct macvlan_dev *vlan,
151 const unsigned char *addr)
152 {
153 u32 val = __get_unaligned_cpu32(addr + 2);
154
155 val ^= macvlan_hash_mix(vlan);
156 return hash_32(val, MACVLAN_MC_FILTER_BITS);
157 }
158
159 static void macvlan_broadcast(struct sk_buff *skb,
160 const struct macvlan_port *port,
161 struct net_device *src,
162 enum macvlan_mode mode)
163 {
164 const struct ethhdr *eth = eth_hdr(skb);
165 const struct macvlan_dev *vlan;
166 struct sk_buff *nskb;
167 unsigned int i;
168 int err;
169 unsigned int hash;
170
171 if (skb->protocol == htons(ETH_P_PAUSE))
172 return;
173
174 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
175 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
176 if (vlan->dev == src || !(vlan->mode & mode))
177 continue;
178
179 hash = mc_hash(vlan, eth->h_dest);
180 if (!test_bit(hash, vlan->mc_filter))
181 continue;
182
183 err = NET_RX_DROP;
184 nskb = skb_clone(skb, GFP_ATOMIC);
185 if (likely(nskb))
186 err = macvlan_broadcast_one(
187 nskb, vlan, eth,
188 mode == MACVLAN_MODE_BRIDGE) ?:
189 netif_rx_ni(nskb);
190 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
191 err == NET_RX_SUCCESS, 1);
192 }
193 }
194 }
195
196 static void macvlan_process_broadcast(struct work_struct *w)
197 {
198 struct macvlan_port *port = container_of(w, struct macvlan_port,
199 bc_work);
200 struct sk_buff *skb;
201 struct sk_buff_head list;
202
203 skb_queue_head_init(&list);
204
205 spin_lock_bh(&port->bc_queue.lock);
206 skb_queue_splice_tail_init(&port->bc_queue, &list);
207 spin_unlock_bh(&port->bc_queue.lock);
208
209 while ((skb = __skb_dequeue(&list))) {
210 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
211
212 rcu_read_lock();
213
214 if (!src)
215 /* frame comes from an external address */
216 macvlan_broadcast(skb, port, NULL,
217 MACVLAN_MODE_PRIVATE |
218 MACVLAN_MODE_VEPA |
219 MACVLAN_MODE_PASSTHRU|
220 MACVLAN_MODE_BRIDGE);
221 else if (src->mode == MACVLAN_MODE_VEPA)
222 /* flood to everyone except source */
223 macvlan_broadcast(skb, port, src->dev,
224 MACVLAN_MODE_VEPA |
225 MACVLAN_MODE_BRIDGE);
226 else
227 /*
228 * flood only to VEPA ports, bridge ports
229 * already saw the frame on the way out.
230 */
231 macvlan_broadcast(skb, port, src->dev,
232 MACVLAN_MODE_VEPA);
233
234 rcu_read_unlock();
235
236 kfree_skb(skb);
237 }
238 }
239
240 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
241 struct sk_buff *skb)
242 {
243 struct sk_buff *nskb;
244 int err = -ENOMEM;
245
246 nskb = skb_clone(skb, GFP_ATOMIC);
247 if (!nskb)
248 goto err;
249
250 spin_lock(&port->bc_queue.lock);
251 if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) {
252 __skb_queue_tail(&port->bc_queue, nskb);
253 err = 0;
254 }
255 spin_unlock(&port->bc_queue.lock);
256
257 if (err)
258 goto free_nskb;
259
260 schedule_work(&port->bc_work);
261 return;
262
263 free_nskb:
264 kfree_skb(nskb);
265 err:
266 atomic_long_inc(&skb->dev->rx_dropped);
267 }
268
269 /* called under rcu_read_lock() from netif_receive_skb */
270 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
271 {
272 struct macvlan_port *port;
273 struct sk_buff *skb = *pskb;
274 const struct ethhdr *eth = eth_hdr(skb);
275 const struct macvlan_dev *vlan;
276 const struct macvlan_dev *src;
277 struct net_device *dev;
278 unsigned int len = 0;
279 int ret = NET_RX_DROP;
280
281 port = macvlan_port_get_rcu(skb->dev);
282 if (is_multicast_ether_addr(eth->h_dest)) {
283 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
284 if (!skb)
285 return RX_HANDLER_CONSUMED;
286 eth = eth_hdr(skb);
287 src = macvlan_hash_lookup(port, eth->h_source);
288 if (src && src->mode != MACVLAN_MODE_VEPA &&
289 src->mode != MACVLAN_MODE_BRIDGE) {
290 /* forward to original port. */
291 vlan = src;
292 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
293 netif_rx(skb);
294 goto out;
295 }
296
297 MACVLAN_SKB_CB(skb)->src = src;
298 macvlan_broadcast_enqueue(port, skb);
299
300 return RX_HANDLER_PASS;
301 }
302
303 if (port->passthru)
304 vlan = list_first_or_null_rcu(&port->vlans,
305 struct macvlan_dev, list);
306 else
307 vlan = macvlan_hash_lookup(port, eth->h_dest);
308 if (vlan == NULL)
309 return RX_HANDLER_PASS;
310
311 dev = vlan->dev;
312 if (unlikely(!(dev->flags & IFF_UP))) {
313 kfree_skb(skb);
314 return RX_HANDLER_CONSUMED;
315 }
316 len = skb->len + ETH_HLEN;
317 skb = skb_share_check(skb, GFP_ATOMIC);
318 if (!skb)
319 goto out;
320
321 skb->dev = dev;
322 skb->pkt_type = PACKET_HOST;
323
324 ret = netif_rx(skb);
325
326 out:
327 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
328 return RX_HANDLER_CONSUMED;
329 }
330
331 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
332 {
333 const struct macvlan_dev *vlan = netdev_priv(dev);
334 const struct macvlan_port *port = vlan->port;
335 const struct macvlan_dev *dest;
336
337 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
338 const struct ethhdr *eth = (void *)skb->data;
339
340 /* send to other bridge ports directly */
341 if (is_multicast_ether_addr(eth->h_dest)) {
342 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
343 goto xmit_world;
344 }
345
346 dest = macvlan_hash_lookup(port, eth->h_dest);
347 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
348 /* send to lowerdev first for its network taps */
349 dev_forward_skb(vlan->lowerdev, skb);
350
351 return NET_XMIT_SUCCESS;
352 }
353 }
354
355 xmit_world:
356 skb->dev = vlan->lowerdev;
357 return dev_queue_xmit(skb);
358 }
359
360 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
361 struct net_device *dev)
362 {
363 unsigned int len = skb->len;
364 int ret;
365 const struct macvlan_dev *vlan = netdev_priv(dev);
366
367 if (vlan->fwd_priv) {
368 skb->dev = vlan->lowerdev;
369 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
370 } else {
371 ret = macvlan_queue_xmit(skb, dev);
372 }
373
374 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
375 struct vlan_pcpu_stats *pcpu_stats;
376
377 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
378 u64_stats_update_begin(&pcpu_stats->syncp);
379 pcpu_stats->tx_packets++;
380 pcpu_stats->tx_bytes += len;
381 u64_stats_update_end(&pcpu_stats->syncp);
382 } else {
383 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
384 }
385 return ret;
386 }
387
388 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
389 unsigned short type, const void *daddr,
390 const void *saddr, unsigned len)
391 {
392 const struct macvlan_dev *vlan = netdev_priv(dev);
393 struct net_device *lowerdev = vlan->lowerdev;
394
395 return dev_hard_header(skb, lowerdev, type, daddr,
396 saddr ? : dev->dev_addr, len);
397 }
398
399 static const struct header_ops macvlan_hard_header_ops = {
400 .create = macvlan_hard_header,
401 .rebuild = eth_rebuild_header,
402 .parse = eth_header_parse,
403 .cache = eth_header_cache,
404 .cache_update = eth_header_cache_update,
405 };
406
407 static struct rtnl_link_ops macvlan_link_ops;
408
409 static int macvlan_open(struct net_device *dev)
410 {
411 struct macvlan_dev *vlan = netdev_priv(dev);
412 struct net_device *lowerdev = vlan->lowerdev;
413 int err;
414
415 if (vlan->port->passthru) {
416 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
417 err = dev_set_promiscuity(lowerdev, 1);
418 if (err < 0)
419 goto out;
420 }
421 goto hash_add;
422 }
423
424 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
425 dev->rtnl_link_ops == &macvlan_link_ops) {
426 vlan->fwd_priv =
427 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
428
429 /* If we get a NULL pointer back, or if we get an error
430 * then we should just fall through to the non accelerated path
431 */
432 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
433 vlan->fwd_priv = NULL;
434 } else
435 return 0;
436 }
437
438 err = -EBUSY;
439 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
440 goto out;
441
442 err = dev_uc_add(lowerdev, dev->dev_addr);
443 if (err < 0)
444 goto out;
445 if (dev->flags & IFF_ALLMULTI) {
446 err = dev_set_allmulti(lowerdev, 1);
447 if (err < 0)
448 goto del_unicast;
449 }
450
451 hash_add:
452 macvlan_hash_add(vlan);
453 return 0;
454
455 del_unicast:
456 dev_uc_del(lowerdev, dev->dev_addr);
457 out:
458 if (vlan->fwd_priv) {
459 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
460 vlan->fwd_priv);
461 vlan->fwd_priv = NULL;
462 }
463 return err;
464 }
465
466 static int macvlan_stop(struct net_device *dev)
467 {
468 struct macvlan_dev *vlan = netdev_priv(dev);
469 struct net_device *lowerdev = vlan->lowerdev;
470
471 if (vlan->fwd_priv) {
472 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
473 vlan->fwd_priv);
474 vlan->fwd_priv = NULL;
475 return 0;
476 }
477
478 dev_uc_unsync(lowerdev, dev);
479 dev_mc_unsync(lowerdev, dev);
480
481 if (vlan->port->passthru) {
482 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
483 dev_set_promiscuity(lowerdev, -1);
484 goto hash_del;
485 }
486
487 if (dev->flags & IFF_ALLMULTI)
488 dev_set_allmulti(lowerdev, -1);
489
490 dev_uc_del(lowerdev, dev->dev_addr);
491
492 hash_del:
493 macvlan_hash_del(vlan, !dev->dismantle);
494 return 0;
495 }
496
497 static int macvlan_set_mac_address(struct net_device *dev, void *p)
498 {
499 struct macvlan_dev *vlan = netdev_priv(dev);
500 struct net_device *lowerdev = vlan->lowerdev;
501 struct sockaddr *addr = p;
502 int err;
503
504 if (!is_valid_ether_addr(addr->sa_data))
505 return -EADDRNOTAVAIL;
506
507 if (!(dev->flags & IFF_UP)) {
508 /* Just copy in the new address */
509 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
510 } else {
511 /* Rehash and update the device filters */
512 if (macvlan_addr_busy(vlan->port, addr->sa_data))
513 return -EBUSY;
514
515 err = dev_uc_add(lowerdev, addr->sa_data);
516 if (err)
517 return err;
518
519 dev_uc_del(lowerdev, dev->dev_addr);
520
521 macvlan_hash_change_addr(vlan, addr->sa_data);
522 }
523 return 0;
524 }
525
526 static void macvlan_change_rx_flags(struct net_device *dev, int change)
527 {
528 struct macvlan_dev *vlan = netdev_priv(dev);
529 struct net_device *lowerdev = vlan->lowerdev;
530
531 if (change & IFF_ALLMULTI)
532 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
533 }
534
535 static void macvlan_set_mac_lists(struct net_device *dev)
536 {
537 struct macvlan_dev *vlan = netdev_priv(dev);
538
539 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
540 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
541 } else {
542 struct netdev_hw_addr *ha;
543 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
544
545 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
546 netdev_for_each_mc_addr(ha, dev) {
547 __set_bit(mc_hash(vlan, ha->addr), filter);
548 }
549
550 __set_bit(mc_hash(vlan, dev->broadcast), filter);
551
552 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
553 }
554 dev_uc_sync(vlan->lowerdev, dev);
555 dev_mc_sync(vlan->lowerdev, dev);
556 }
557
558 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
559 {
560 struct macvlan_dev *vlan = netdev_priv(dev);
561
562 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
563 return -EINVAL;
564 dev->mtu = new_mtu;
565 return 0;
566 }
567
568 /*
569 * macvlan network devices have devices nesting below it and are a special
570 * "super class" of normal network devices; split their locks off into a
571 * separate class since they always nest.
572 */
573 static struct lock_class_key macvlan_netdev_xmit_lock_key;
574 static struct lock_class_key macvlan_netdev_addr_lock_key;
575
576 #define ALWAYS_ON_FEATURES \
577 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
578
579 #define MACVLAN_FEATURES \
580 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
581 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
582 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
583 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
584
585 #define MACVLAN_STATE_MASK \
586 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
587
588 static void macvlan_set_lockdep_class_one(struct net_device *dev,
589 struct netdev_queue *txq,
590 void *_unused)
591 {
592 lockdep_set_class(&txq->_xmit_lock,
593 &macvlan_netdev_xmit_lock_key);
594 }
595
596 static void macvlan_set_lockdep_class(struct net_device *dev)
597 {
598 lockdep_set_class(&dev->addr_list_lock,
599 &macvlan_netdev_addr_lock_key);
600 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
601 }
602
603 static int macvlan_init(struct net_device *dev)
604 {
605 struct macvlan_dev *vlan = netdev_priv(dev);
606 const struct net_device *lowerdev = vlan->lowerdev;
607
608 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
609 (lowerdev->state & MACVLAN_STATE_MASK);
610 dev->features = lowerdev->features & MACVLAN_FEATURES;
611 dev->features |= ALWAYS_ON_FEATURES;
612 dev->gso_max_size = lowerdev->gso_max_size;
613 dev->iflink = lowerdev->ifindex;
614 dev->hard_header_len = lowerdev->hard_header_len;
615
616 macvlan_set_lockdep_class(dev);
617
618 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
619 if (!vlan->pcpu_stats)
620 return -ENOMEM;
621
622 return 0;
623 }
624
625 static void macvlan_uninit(struct net_device *dev)
626 {
627 struct macvlan_dev *vlan = netdev_priv(dev);
628 struct macvlan_port *port = vlan->port;
629
630 free_percpu(vlan->pcpu_stats);
631
632 if (MACVLAN_PORT_IS_EMPTY(port))
633 macvlan_port_destroy(port->dev);
634 }
635
636 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
637 struct rtnl_link_stats64 *stats)
638 {
639 struct macvlan_dev *vlan = netdev_priv(dev);
640
641 if (vlan->pcpu_stats) {
642 struct vlan_pcpu_stats *p;
643 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
644 u32 rx_errors = 0, tx_dropped = 0;
645 unsigned int start;
646 int i;
647
648 for_each_possible_cpu(i) {
649 p = per_cpu_ptr(vlan->pcpu_stats, i);
650 do {
651 start = u64_stats_fetch_begin_irq(&p->syncp);
652 rx_packets = p->rx_packets;
653 rx_bytes = p->rx_bytes;
654 rx_multicast = p->rx_multicast;
655 tx_packets = p->tx_packets;
656 tx_bytes = p->tx_bytes;
657 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
658
659 stats->rx_packets += rx_packets;
660 stats->rx_bytes += rx_bytes;
661 stats->multicast += rx_multicast;
662 stats->tx_packets += tx_packets;
663 stats->tx_bytes += tx_bytes;
664 /* rx_errors & tx_dropped are u32, updated
665 * without syncp protection.
666 */
667 rx_errors += p->rx_errors;
668 tx_dropped += p->tx_dropped;
669 }
670 stats->rx_errors = rx_errors;
671 stats->rx_dropped = rx_errors;
672 stats->tx_dropped = tx_dropped;
673 }
674 return stats;
675 }
676
677 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
678 __be16 proto, u16 vid)
679 {
680 struct macvlan_dev *vlan = netdev_priv(dev);
681 struct net_device *lowerdev = vlan->lowerdev;
682
683 return vlan_vid_add(lowerdev, proto, vid);
684 }
685
686 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
687 __be16 proto, u16 vid)
688 {
689 struct macvlan_dev *vlan = netdev_priv(dev);
690 struct net_device *lowerdev = vlan->lowerdev;
691
692 vlan_vid_del(lowerdev, proto, vid);
693 return 0;
694 }
695
696 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
697 struct net_device *dev,
698 const unsigned char *addr,
699 u16 flags)
700 {
701 struct macvlan_dev *vlan = netdev_priv(dev);
702 int err = -EINVAL;
703
704 if (!vlan->port->passthru)
705 return -EOPNOTSUPP;
706
707 if (flags & NLM_F_REPLACE)
708 return -EOPNOTSUPP;
709
710 if (is_unicast_ether_addr(addr))
711 err = dev_uc_add_excl(dev, addr);
712 else if (is_multicast_ether_addr(addr))
713 err = dev_mc_add_excl(dev, addr);
714
715 return err;
716 }
717
718 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
719 struct net_device *dev,
720 const unsigned char *addr)
721 {
722 struct macvlan_dev *vlan = netdev_priv(dev);
723 int err = -EINVAL;
724
725 if (!vlan->port->passthru)
726 return -EOPNOTSUPP;
727
728 if (is_unicast_ether_addr(addr))
729 err = dev_uc_del(dev, addr);
730 else if (is_multicast_ether_addr(addr))
731 err = dev_mc_del(dev, addr);
732
733 return err;
734 }
735
736 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
737 struct ethtool_drvinfo *drvinfo)
738 {
739 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
740 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
741 }
742
743 static int macvlan_ethtool_get_settings(struct net_device *dev,
744 struct ethtool_cmd *cmd)
745 {
746 const struct macvlan_dev *vlan = netdev_priv(dev);
747
748 return __ethtool_get_settings(vlan->lowerdev, cmd);
749 }
750
751 static netdev_features_t macvlan_fix_features(struct net_device *dev,
752 netdev_features_t features)
753 {
754 struct macvlan_dev *vlan = netdev_priv(dev);
755 netdev_features_t mask;
756
757 features |= NETIF_F_ALL_FOR_ALL;
758 features &= (vlan->set_features | ~MACVLAN_FEATURES);
759 mask = features;
760
761 features = netdev_increment_features(vlan->lowerdev->features,
762 features,
763 mask);
764 features |= ALWAYS_ON_FEATURES;
765
766 return features;
767 }
768
769 static const struct ethtool_ops macvlan_ethtool_ops = {
770 .get_link = ethtool_op_get_link,
771 .get_settings = macvlan_ethtool_get_settings,
772 .get_drvinfo = macvlan_ethtool_get_drvinfo,
773 };
774
775 static const struct net_device_ops macvlan_netdev_ops = {
776 .ndo_init = macvlan_init,
777 .ndo_uninit = macvlan_uninit,
778 .ndo_open = macvlan_open,
779 .ndo_stop = macvlan_stop,
780 .ndo_start_xmit = macvlan_start_xmit,
781 .ndo_change_mtu = macvlan_change_mtu,
782 .ndo_fix_features = macvlan_fix_features,
783 .ndo_change_rx_flags = macvlan_change_rx_flags,
784 .ndo_set_mac_address = macvlan_set_mac_address,
785 .ndo_set_rx_mode = macvlan_set_mac_lists,
786 .ndo_get_stats64 = macvlan_dev_get_stats64,
787 .ndo_validate_addr = eth_validate_addr,
788 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
789 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
790 .ndo_fdb_add = macvlan_fdb_add,
791 .ndo_fdb_del = macvlan_fdb_del,
792 .ndo_fdb_dump = ndo_dflt_fdb_dump,
793 };
794
795 void macvlan_common_setup(struct net_device *dev)
796 {
797 ether_setup(dev);
798
799 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
800 dev->priv_flags |= IFF_UNICAST_FLT;
801 dev->netdev_ops = &macvlan_netdev_ops;
802 dev->destructor = free_netdev;
803 dev->header_ops = &macvlan_hard_header_ops;
804 dev->ethtool_ops = &macvlan_ethtool_ops;
805 }
806 EXPORT_SYMBOL_GPL(macvlan_common_setup);
807
808 static void macvlan_setup(struct net_device *dev)
809 {
810 macvlan_common_setup(dev);
811 dev->tx_queue_len = 0;
812 }
813
814 static int macvlan_port_create(struct net_device *dev)
815 {
816 struct macvlan_port *port;
817 unsigned int i;
818 int err;
819
820 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
821 return -EINVAL;
822
823 port = kzalloc(sizeof(*port), GFP_KERNEL);
824 if (port == NULL)
825 return -ENOMEM;
826
827 port->passthru = false;
828 port->dev = dev;
829 INIT_LIST_HEAD(&port->vlans);
830 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
831 INIT_HLIST_HEAD(&port->vlan_hash[i]);
832
833 skb_queue_head_init(&port->bc_queue);
834 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
835
836 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
837 if (err)
838 kfree(port);
839 else
840 dev->priv_flags |= IFF_MACVLAN_PORT;
841 return err;
842 }
843
844 static void macvlan_port_destroy(struct net_device *dev)
845 {
846 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
847
848 cancel_work_sync(&port->bc_work);
849 dev->priv_flags &= ~IFF_MACVLAN_PORT;
850 netdev_rx_handler_unregister(dev);
851 kfree_rcu(port, rcu);
852 }
853
854 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
855 {
856 if (tb[IFLA_ADDRESS]) {
857 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
858 return -EINVAL;
859 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
860 return -EADDRNOTAVAIL;
861 }
862
863 if (data && data[IFLA_MACVLAN_FLAGS] &&
864 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
865 return -EINVAL;
866
867 if (data && data[IFLA_MACVLAN_MODE]) {
868 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
869 case MACVLAN_MODE_PRIVATE:
870 case MACVLAN_MODE_VEPA:
871 case MACVLAN_MODE_BRIDGE:
872 case MACVLAN_MODE_PASSTHRU:
873 break;
874 default:
875 return -EINVAL;
876 }
877 }
878 return 0;
879 }
880
881 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
882 struct nlattr *tb[], struct nlattr *data[])
883 {
884 struct macvlan_dev *vlan = netdev_priv(dev);
885 struct macvlan_port *port;
886 struct net_device *lowerdev;
887 int err;
888
889 if (!tb[IFLA_LINK])
890 return -EINVAL;
891
892 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
893 if (lowerdev == NULL)
894 return -ENODEV;
895
896 /* When creating macvlans or macvtaps on top of other macvlans - use
897 * the real device as the lowerdev.
898 */
899 if (netif_is_macvlan(lowerdev))
900 lowerdev = macvlan_dev_real_dev(lowerdev);
901
902 if (!tb[IFLA_MTU])
903 dev->mtu = lowerdev->mtu;
904 else if (dev->mtu > lowerdev->mtu)
905 return -EINVAL;
906
907 if (!tb[IFLA_ADDRESS])
908 eth_hw_addr_random(dev);
909
910 if (!macvlan_port_exists(lowerdev)) {
911 err = macvlan_port_create(lowerdev);
912 if (err < 0)
913 return err;
914 }
915 port = macvlan_port_get_rtnl(lowerdev);
916
917 /* Only 1 macvlan device can be created in passthru mode */
918 if (port->passthru)
919 return -EINVAL;
920
921 vlan->lowerdev = lowerdev;
922 vlan->dev = dev;
923 vlan->port = port;
924 vlan->set_features = MACVLAN_FEATURES;
925
926 vlan->mode = MACVLAN_MODE_VEPA;
927 if (data && data[IFLA_MACVLAN_MODE])
928 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
929
930 if (data && data[IFLA_MACVLAN_FLAGS])
931 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
932
933 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
934 if (!MACVLAN_PORT_IS_EMPTY(port))
935 return -EINVAL;
936 port->passthru = true;
937 eth_hw_addr_inherit(dev, lowerdev);
938 }
939
940 err = register_netdevice(dev);
941 if (err < 0)
942 goto destroy_port;
943
944 dev->priv_flags |= IFF_MACVLAN;
945 err = netdev_upper_dev_link(lowerdev, dev);
946 if (err)
947 goto unregister_netdev;
948
949 list_add_tail_rcu(&vlan->list, &port->vlans);
950 netif_stacked_transfer_operstate(lowerdev, dev);
951
952 return 0;
953
954 unregister_netdev:
955 unregister_netdevice(dev);
956 destroy_port:
957 if (MACVLAN_PORT_IS_EMPTY(port))
958 macvlan_port_destroy(lowerdev);
959
960 return err;
961 }
962 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
963
964 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
965 struct nlattr *tb[], struct nlattr *data[])
966 {
967 return macvlan_common_newlink(src_net, dev, tb, data);
968 }
969
970 void macvlan_dellink(struct net_device *dev, struct list_head *head)
971 {
972 struct macvlan_dev *vlan = netdev_priv(dev);
973
974 list_del_rcu(&vlan->list);
975 unregister_netdevice_queue(dev, head);
976 netdev_upper_dev_unlink(vlan->lowerdev, dev);
977 }
978 EXPORT_SYMBOL_GPL(macvlan_dellink);
979
980 static int macvlan_changelink(struct net_device *dev,
981 struct nlattr *tb[], struct nlattr *data[])
982 {
983 struct macvlan_dev *vlan = netdev_priv(dev);
984 enum macvlan_mode mode;
985 bool set_mode = false;
986
987 /* Validate mode, but don't set yet: setting flags may fail. */
988 if (data && data[IFLA_MACVLAN_MODE]) {
989 set_mode = true;
990 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
991 /* Passthrough mode can't be set or cleared dynamically */
992 if ((mode == MACVLAN_MODE_PASSTHRU) !=
993 (vlan->mode == MACVLAN_MODE_PASSTHRU))
994 return -EINVAL;
995 }
996
997 if (data && data[IFLA_MACVLAN_FLAGS]) {
998 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
999 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1000 if (vlan->port->passthru && promisc) {
1001 int err;
1002
1003 if (flags & MACVLAN_FLAG_NOPROMISC)
1004 err = dev_set_promiscuity(vlan->lowerdev, -1);
1005 else
1006 err = dev_set_promiscuity(vlan->lowerdev, 1);
1007 if (err < 0)
1008 return err;
1009 }
1010 vlan->flags = flags;
1011 }
1012 if (set_mode)
1013 vlan->mode = mode;
1014 return 0;
1015 }
1016
1017 static size_t macvlan_get_size(const struct net_device *dev)
1018 {
1019 return (0
1020 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1021 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1022 );
1023 }
1024
1025 static int macvlan_fill_info(struct sk_buff *skb,
1026 const struct net_device *dev)
1027 {
1028 struct macvlan_dev *vlan = netdev_priv(dev);
1029
1030 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1031 goto nla_put_failure;
1032 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1033 goto nla_put_failure;
1034 return 0;
1035
1036 nla_put_failure:
1037 return -EMSGSIZE;
1038 }
1039
1040 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1041 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1042 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1043 };
1044
1045 int macvlan_link_register(struct rtnl_link_ops *ops)
1046 {
1047 /* common fields */
1048 ops->priv_size = sizeof(struct macvlan_dev);
1049 ops->validate = macvlan_validate;
1050 ops->maxtype = IFLA_MACVLAN_MAX;
1051 ops->policy = macvlan_policy;
1052 ops->changelink = macvlan_changelink;
1053 ops->get_size = macvlan_get_size;
1054 ops->fill_info = macvlan_fill_info;
1055
1056 return rtnl_link_register(ops);
1057 };
1058 EXPORT_SYMBOL_GPL(macvlan_link_register);
1059
1060 static struct rtnl_link_ops macvlan_link_ops = {
1061 .kind = "macvlan",
1062 .setup = macvlan_setup,
1063 .newlink = macvlan_newlink,
1064 .dellink = macvlan_dellink,
1065 };
1066
1067 static int macvlan_device_event(struct notifier_block *unused,
1068 unsigned long event, void *ptr)
1069 {
1070 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1071 struct macvlan_dev *vlan, *next;
1072 struct macvlan_port *port;
1073 LIST_HEAD(list_kill);
1074
1075 if (!macvlan_port_exists(dev))
1076 return NOTIFY_DONE;
1077
1078 port = macvlan_port_get_rtnl(dev);
1079
1080 switch (event) {
1081 case NETDEV_CHANGE:
1082 list_for_each_entry(vlan, &port->vlans, list)
1083 netif_stacked_transfer_operstate(vlan->lowerdev,
1084 vlan->dev);
1085 break;
1086 case NETDEV_FEAT_CHANGE:
1087 list_for_each_entry(vlan, &port->vlans, list) {
1088 vlan->dev->gso_max_size = dev->gso_max_size;
1089 netdev_update_features(vlan->dev);
1090 }
1091 break;
1092 case NETDEV_CHANGEMTU:
1093 list_for_each_entry(vlan, &port->vlans, list) {
1094 if (vlan->dev->mtu <= dev->mtu)
1095 continue;
1096 dev_set_mtu(vlan->dev, dev->mtu);
1097 }
1098 break;
1099 case NETDEV_UNREGISTER:
1100 /* twiddle thumbs on netns device moves */
1101 if (dev->reg_state != NETREG_UNREGISTERING)
1102 break;
1103
1104 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1105 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1106 unregister_netdevice_many(&list_kill);
1107 list_del(&list_kill);
1108 break;
1109 case NETDEV_PRE_TYPE_CHANGE:
1110 /* Forbid underlaying device to change its type. */
1111 return NOTIFY_BAD;
1112 }
1113 return NOTIFY_DONE;
1114 }
1115
1116 static struct notifier_block macvlan_notifier_block __read_mostly = {
1117 .notifier_call = macvlan_device_event,
1118 };
1119
1120 static int __init macvlan_init_module(void)
1121 {
1122 int err;
1123
1124 register_netdevice_notifier(&macvlan_notifier_block);
1125
1126 err = macvlan_link_register(&macvlan_link_ops);
1127 if (err < 0)
1128 goto err1;
1129 return 0;
1130 err1:
1131 unregister_netdevice_notifier(&macvlan_notifier_block);
1132 return err;
1133 }
1134
1135 static void __exit macvlan_cleanup_module(void)
1136 {
1137 rtnl_link_unregister(&macvlan_link_ops);
1138 unregister_netdevice_notifier(&macvlan_notifier_block);
1139 }
1140
1141 module_init(macvlan_init_module);
1142 module_exit(macvlan_cleanup_module);
1143
1144 MODULE_LICENSE("GPL");
1145 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1146 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1147 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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