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packet: handle too big packets for PACKET_V3
[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 #include <linux/netpoll.h>
37
38 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
39
40 struct macvlan_port {
41 struct net_device *dev;
42 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
43 struct list_head vlans;
44 struct rcu_head rcu;
45 struct sk_buff_head bc_queue;
46 struct work_struct bc_work;
47 bool passthru;
48 int count;
49 };
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 inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
361 {
362 #ifdef CONFIG_NET_POLL_CONTROLLER
363 if (vlan->netpoll)
364 netpoll_send_skb(vlan->netpoll, skb);
365 #else
366 BUG();
367 #endif
368 return NETDEV_TX_OK;
369 }
370
371 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
372 struct net_device *dev)
373 {
374 unsigned int len = skb->len;
375 int ret;
376 struct macvlan_dev *vlan = netdev_priv(dev);
377
378 if (unlikely(netpoll_tx_running(dev)))
379 return macvlan_netpoll_send_skb(vlan, skb);
380
381 if (vlan->fwd_priv) {
382 skb->dev = vlan->lowerdev;
383 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
384 } else {
385 ret = macvlan_queue_xmit(skb, dev);
386 }
387
388 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
389 struct vlan_pcpu_stats *pcpu_stats;
390
391 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
392 u64_stats_update_begin(&pcpu_stats->syncp);
393 pcpu_stats->tx_packets++;
394 pcpu_stats->tx_bytes += len;
395 u64_stats_update_end(&pcpu_stats->syncp);
396 } else {
397 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
398 }
399 return ret;
400 }
401
402 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
403 unsigned short type, const void *daddr,
404 const void *saddr, unsigned len)
405 {
406 const struct macvlan_dev *vlan = netdev_priv(dev);
407 struct net_device *lowerdev = vlan->lowerdev;
408
409 return dev_hard_header(skb, lowerdev, type, daddr,
410 saddr ? : dev->dev_addr, len);
411 }
412
413 static const struct header_ops macvlan_hard_header_ops = {
414 .create = macvlan_hard_header,
415 .rebuild = eth_rebuild_header,
416 .parse = eth_header_parse,
417 .cache = eth_header_cache,
418 .cache_update = eth_header_cache_update,
419 };
420
421 static struct rtnl_link_ops macvlan_link_ops;
422
423 static int macvlan_open(struct net_device *dev)
424 {
425 struct macvlan_dev *vlan = netdev_priv(dev);
426 struct net_device *lowerdev = vlan->lowerdev;
427 int err;
428
429 if (vlan->port->passthru) {
430 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
431 err = dev_set_promiscuity(lowerdev, 1);
432 if (err < 0)
433 goto out;
434 }
435 goto hash_add;
436 }
437
438 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
439 dev->rtnl_link_ops == &macvlan_link_ops) {
440 vlan->fwd_priv =
441 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
442
443 /* If we get a NULL pointer back, or if we get an error
444 * then we should just fall through to the non accelerated path
445 */
446 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
447 vlan->fwd_priv = NULL;
448 } else
449 return 0;
450 }
451
452 err = -EBUSY;
453 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
454 goto out;
455
456 err = dev_uc_add(lowerdev, dev->dev_addr);
457 if (err < 0)
458 goto out;
459 if (dev->flags & IFF_ALLMULTI) {
460 err = dev_set_allmulti(lowerdev, 1);
461 if (err < 0)
462 goto del_unicast;
463 }
464
465 hash_add:
466 macvlan_hash_add(vlan);
467 return 0;
468
469 del_unicast:
470 dev_uc_del(lowerdev, dev->dev_addr);
471 out:
472 if (vlan->fwd_priv) {
473 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
474 vlan->fwd_priv);
475 vlan->fwd_priv = NULL;
476 }
477 return err;
478 }
479
480 static int macvlan_stop(struct net_device *dev)
481 {
482 struct macvlan_dev *vlan = netdev_priv(dev);
483 struct net_device *lowerdev = vlan->lowerdev;
484
485 if (vlan->fwd_priv) {
486 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
487 vlan->fwd_priv);
488 vlan->fwd_priv = NULL;
489 return 0;
490 }
491
492 dev_uc_unsync(lowerdev, dev);
493 dev_mc_unsync(lowerdev, dev);
494
495 if (vlan->port->passthru) {
496 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
497 dev_set_promiscuity(lowerdev, -1);
498 goto hash_del;
499 }
500
501 if (dev->flags & IFF_ALLMULTI)
502 dev_set_allmulti(lowerdev, -1);
503
504 dev_uc_del(lowerdev, dev->dev_addr);
505
506 hash_del:
507 macvlan_hash_del(vlan, !dev->dismantle);
508 return 0;
509 }
510
511 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
512 {
513 struct macvlan_dev *vlan = netdev_priv(dev);
514 struct net_device *lowerdev = vlan->lowerdev;
515 int err;
516
517 if (!(dev->flags & IFF_UP)) {
518 /* Just copy in the new address */
519 ether_addr_copy(dev->dev_addr, addr);
520 } else {
521 /* Rehash and update the device filters */
522 if (macvlan_addr_busy(vlan->port, addr))
523 return -EBUSY;
524
525 if (!vlan->port->passthru) {
526 err = dev_uc_add(lowerdev, addr);
527 if (err)
528 return err;
529
530 dev_uc_del(lowerdev, dev->dev_addr);
531 }
532
533 macvlan_hash_change_addr(vlan, addr);
534 }
535 return 0;
536 }
537
538 static int macvlan_set_mac_address(struct net_device *dev, void *p)
539 {
540 struct macvlan_dev *vlan = netdev_priv(dev);
541 struct sockaddr *addr = p;
542
543 if (!is_valid_ether_addr(addr->sa_data))
544 return -EADDRNOTAVAIL;
545
546 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
547 dev_set_mac_address(vlan->lowerdev, addr);
548 return 0;
549 }
550
551 return macvlan_sync_address(dev, addr->sa_data);
552 }
553
554 static void macvlan_change_rx_flags(struct net_device *dev, int change)
555 {
556 struct macvlan_dev *vlan = netdev_priv(dev);
557 struct net_device *lowerdev = vlan->lowerdev;
558
559 if (dev->flags & IFF_UP) {
560 if (change & IFF_ALLMULTI)
561 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
562 }
563 }
564
565 static void macvlan_set_mac_lists(struct net_device *dev)
566 {
567 struct macvlan_dev *vlan = netdev_priv(dev);
568
569 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
570 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
571 } else {
572 struct netdev_hw_addr *ha;
573 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
574
575 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
576 netdev_for_each_mc_addr(ha, dev) {
577 __set_bit(mc_hash(vlan, ha->addr), filter);
578 }
579
580 __set_bit(mc_hash(vlan, dev->broadcast), filter);
581
582 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
583 }
584 dev_uc_sync(vlan->lowerdev, dev);
585 dev_mc_sync(vlan->lowerdev, dev);
586 }
587
588 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
589 {
590 struct macvlan_dev *vlan = netdev_priv(dev);
591
592 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
593 return -EINVAL;
594 dev->mtu = new_mtu;
595 return 0;
596 }
597
598 /*
599 * macvlan network devices have devices nesting below it and are a special
600 * "super class" of normal network devices; split their locks off into a
601 * separate class since they always nest.
602 */
603 static struct lock_class_key macvlan_netdev_xmit_lock_key;
604 static struct lock_class_key macvlan_netdev_addr_lock_key;
605
606 #define ALWAYS_ON_FEATURES \
607 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
608
609 #define MACVLAN_FEATURES \
610 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
611 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
612 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
613 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
614
615 #define MACVLAN_STATE_MASK \
616 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
617
618 static int macvlan_get_nest_level(struct net_device *dev)
619 {
620 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
621 }
622
623 static void macvlan_set_lockdep_class_one(struct net_device *dev,
624 struct netdev_queue *txq,
625 void *_unused)
626 {
627 lockdep_set_class(&txq->_xmit_lock,
628 &macvlan_netdev_xmit_lock_key);
629 }
630
631 static void macvlan_set_lockdep_class(struct net_device *dev)
632 {
633 lockdep_set_class_and_subclass(&dev->addr_list_lock,
634 &macvlan_netdev_addr_lock_key,
635 macvlan_get_nest_level(dev));
636 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
637 }
638
639 static int macvlan_init(struct net_device *dev)
640 {
641 struct macvlan_dev *vlan = netdev_priv(dev);
642 const struct net_device *lowerdev = vlan->lowerdev;
643
644 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
645 (lowerdev->state & MACVLAN_STATE_MASK);
646 dev->features = lowerdev->features & MACVLAN_FEATURES;
647 dev->features |= ALWAYS_ON_FEATURES;
648 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
649 dev->gso_max_size = lowerdev->gso_max_size;
650 dev->iflink = lowerdev->ifindex;
651 dev->hard_header_len = lowerdev->hard_header_len;
652
653 macvlan_set_lockdep_class(dev);
654
655 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
656 if (!vlan->pcpu_stats)
657 return -ENOMEM;
658
659 return 0;
660 }
661
662 static void macvlan_uninit(struct net_device *dev)
663 {
664 struct macvlan_dev *vlan = netdev_priv(dev);
665 struct macvlan_port *port = vlan->port;
666
667 free_percpu(vlan->pcpu_stats);
668
669 port->count -= 1;
670 if (!port->count)
671 macvlan_port_destroy(port->dev);
672 }
673
674 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
675 struct rtnl_link_stats64 *stats)
676 {
677 struct macvlan_dev *vlan = netdev_priv(dev);
678
679 if (vlan->pcpu_stats) {
680 struct vlan_pcpu_stats *p;
681 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
682 u32 rx_errors = 0, tx_dropped = 0;
683 unsigned int start;
684 int i;
685
686 for_each_possible_cpu(i) {
687 p = per_cpu_ptr(vlan->pcpu_stats, i);
688 do {
689 start = u64_stats_fetch_begin_irq(&p->syncp);
690 rx_packets = p->rx_packets;
691 rx_bytes = p->rx_bytes;
692 rx_multicast = p->rx_multicast;
693 tx_packets = p->tx_packets;
694 tx_bytes = p->tx_bytes;
695 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
696
697 stats->rx_packets += rx_packets;
698 stats->rx_bytes += rx_bytes;
699 stats->multicast += rx_multicast;
700 stats->tx_packets += tx_packets;
701 stats->tx_bytes += tx_bytes;
702 /* rx_errors & tx_dropped are u32, updated
703 * without syncp protection.
704 */
705 rx_errors += p->rx_errors;
706 tx_dropped += p->tx_dropped;
707 }
708 stats->rx_errors = rx_errors;
709 stats->rx_dropped = rx_errors;
710 stats->tx_dropped = tx_dropped;
711 }
712 return stats;
713 }
714
715 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
716 __be16 proto, u16 vid)
717 {
718 struct macvlan_dev *vlan = netdev_priv(dev);
719 struct net_device *lowerdev = vlan->lowerdev;
720
721 return vlan_vid_add(lowerdev, proto, vid);
722 }
723
724 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
725 __be16 proto, u16 vid)
726 {
727 struct macvlan_dev *vlan = netdev_priv(dev);
728 struct net_device *lowerdev = vlan->lowerdev;
729
730 vlan_vid_del(lowerdev, proto, vid);
731 return 0;
732 }
733
734 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
735 struct net_device *dev,
736 const unsigned char *addr,
737 u16 flags)
738 {
739 struct macvlan_dev *vlan = netdev_priv(dev);
740 int err = -EINVAL;
741
742 if (!vlan->port->passthru)
743 return -EOPNOTSUPP;
744
745 if (flags & NLM_F_REPLACE)
746 return -EOPNOTSUPP;
747
748 if (is_unicast_ether_addr(addr))
749 err = dev_uc_add_excl(dev, addr);
750 else if (is_multicast_ether_addr(addr))
751 err = dev_mc_add_excl(dev, addr);
752
753 return err;
754 }
755
756 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
757 struct net_device *dev,
758 const unsigned char *addr)
759 {
760 struct macvlan_dev *vlan = netdev_priv(dev);
761 int err = -EINVAL;
762
763 if (!vlan->port->passthru)
764 return -EOPNOTSUPP;
765
766 if (is_unicast_ether_addr(addr))
767 err = dev_uc_del(dev, addr);
768 else if (is_multicast_ether_addr(addr))
769 err = dev_mc_del(dev, addr);
770
771 return err;
772 }
773
774 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
775 struct ethtool_drvinfo *drvinfo)
776 {
777 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
778 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
779 }
780
781 static int macvlan_ethtool_get_settings(struct net_device *dev,
782 struct ethtool_cmd *cmd)
783 {
784 const struct macvlan_dev *vlan = netdev_priv(dev);
785
786 return __ethtool_get_settings(vlan->lowerdev, cmd);
787 }
788
789 static netdev_features_t macvlan_fix_features(struct net_device *dev,
790 netdev_features_t features)
791 {
792 struct macvlan_dev *vlan = netdev_priv(dev);
793 netdev_features_t mask;
794
795 features |= NETIF_F_ALL_FOR_ALL;
796 features &= (vlan->set_features | ~MACVLAN_FEATURES);
797 mask = features;
798
799 features = netdev_increment_features(vlan->lowerdev->features,
800 features,
801 mask);
802 features |= ALWAYS_ON_FEATURES;
803
804 return features;
805 }
806
807 #ifdef CONFIG_NET_POLL_CONTROLLER
808 static void macvlan_dev_poll_controller(struct net_device *dev)
809 {
810 return;
811 }
812
813 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
814 {
815 struct macvlan_dev *vlan = netdev_priv(dev);
816 struct net_device *real_dev = vlan->lowerdev;
817 struct netpoll *netpoll;
818 int err = 0;
819
820 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
821 err = -ENOMEM;
822 if (!netpoll)
823 goto out;
824
825 err = __netpoll_setup(netpoll, real_dev);
826 if (err) {
827 kfree(netpoll);
828 goto out;
829 }
830
831 vlan->netpoll = netpoll;
832
833 out:
834 return err;
835 }
836
837 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
838 {
839 struct macvlan_dev *vlan = netdev_priv(dev);
840 struct netpoll *netpoll = vlan->netpoll;
841
842 if (!netpoll)
843 return;
844
845 vlan->netpoll = NULL;
846
847 __netpoll_free_async(netpoll);
848 }
849 #endif /* CONFIG_NET_POLL_CONTROLLER */
850
851 static const struct ethtool_ops macvlan_ethtool_ops = {
852 .get_link = ethtool_op_get_link,
853 .get_settings = macvlan_ethtool_get_settings,
854 .get_drvinfo = macvlan_ethtool_get_drvinfo,
855 };
856
857 static const struct net_device_ops macvlan_netdev_ops = {
858 .ndo_init = macvlan_init,
859 .ndo_uninit = macvlan_uninit,
860 .ndo_open = macvlan_open,
861 .ndo_stop = macvlan_stop,
862 .ndo_start_xmit = macvlan_start_xmit,
863 .ndo_change_mtu = macvlan_change_mtu,
864 .ndo_fix_features = macvlan_fix_features,
865 .ndo_change_rx_flags = macvlan_change_rx_flags,
866 .ndo_set_mac_address = macvlan_set_mac_address,
867 .ndo_set_rx_mode = macvlan_set_mac_lists,
868 .ndo_get_stats64 = macvlan_dev_get_stats64,
869 .ndo_validate_addr = eth_validate_addr,
870 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
871 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
872 .ndo_fdb_add = macvlan_fdb_add,
873 .ndo_fdb_del = macvlan_fdb_del,
874 .ndo_fdb_dump = ndo_dflt_fdb_dump,
875 .ndo_get_lock_subclass = macvlan_get_nest_level,
876 #ifdef CONFIG_NET_POLL_CONTROLLER
877 .ndo_poll_controller = macvlan_dev_poll_controller,
878 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
879 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
880 #endif
881 };
882
883 void macvlan_common_setup(struct net_device *dev)
884 {
885 ether_setup(dev);
886
887 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
888 dev->priv_flags |= IFF_UNICAST_FLT;
889 dev->netdev_ops = &macvlan_netdev_ops;
890 dev->destructor = free_netdev;
891 dev->header_ops = &macvlan_hard_header_ops;
892 dev->ethtool_ops = &macvlan_ethtool_ops;
893 }
894 EXPORT_SYMBOL_GPL(macvlan_common_setup);
895
896 static void macvlan_setup(struct net_device *dev)
897 {
898 macvlan_common_setup(dev);
899 dev->tx_queue_len = 0;
900 }
901
902 static int macvlan_port_create(struct net_device *dev)
903 {
904 struct macvlan_port *port;
905 unsigned int i;
906 int err;
907
908 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
909 return -EINVAL;
910
911 port = kzalloc(sizeof(*port), GFP_KERNEL);
912 if (port == NULL)
913 return -ENOMEM;
914
915 port->passthru = false;
916 port->dev = dev;
917 INIT_LIST_HEAD(&port->vlans);
918 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
919 INIT_HLIST_HEAD(&port->vlan_hash[i]);
920
921 skb_queue_head_init(&port->bc_queue);
922 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
923
924 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
925 if (err)
926 kfree(port);
927 else
928 dev->priv_flags |= IFF_MACVLAN_PORT;
929 return err;
930 }
931
932 static void macvlan_port_destroy(struct net_device *dev)
933 {
934 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
935
936 cancel_work_sync(&port->bc_work);
937 dev->priv_flags &= ~IFF_MACVLAN_PORT;
938 netdev_rx_handler_unregister(dev);
939 kfree_rcu(port, rcu);
940 }
941
942 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
943 {
944 if (tb[IFLA_ADDRESS]) {
945 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
946 return -EINVAL;
947 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
948 return -EADDRNOTAVAIL;
949 }
950
951 if (data && data[IFLA_MACVLAN_FLAGS] &&
952 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
953 return -EINVAL;
954
955 if (data && data[IFLA_MACVLAN_MODE]) {
956 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
957 case MACVLAN_MODE_PRIVATE:
958 case MACVLAN_MODE_VEPA:
959 case MACVLAN_MODE_BRIDGE:
960 case MACVLAN_MODE_PASSTHRU:
961 break;
962 default:
963 return -EINVAL;
964 }
965 }
966 return 0;
967 }
968
969 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
970 struct nlattr *tb[], struct nlattr *data[])
971 {
972 struct macvlan_dev *vlan = netdev_priv(dev);
973 struct macvlan_port *port;
974 struct net_device *lowerdev;
975 int err;
976
977 if (!tb[IFLA_LINK])
978 return -EINVAL;
979
980 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
981 if (lowerdev == NULL)
982 return -ENODEV;
983
984 /* When creating macvlans or macvtaps on top of other macvlans - use
985 * the real device as the lowerdev.
986 */
987 if (netif_is_macvlan(lowerdev))
988 lowerdev = macvlan_dev_real_dev(lowerdev);
989
990 if (!tb[IFLA_MTU])
991 dev->mtu = lowerdev->mtu;
992 else if (dev->mtu > lowerdev->mtu)
993 return -EINVAL;
994
995 if (!tb[IFLA_ADDRESS])
996 eth_hw_addr_random(dev);
997
998 if (!macvlan_port_exists(lowerdev)) {
999 err = macvlan_port_create(lowerdev);
1000 if (err < 0)
1001 return err;
1002 }
1003 port = macvlan_port_get_rtnl(lowerdev);
1004
1005 /* Only 1 macvlan device can be created in passthru mode */
1006 if (port->passthru)
1007 return -EINVAL;
1008
1009 vlan->lowerdev = lowerdev;
1010 vlan->dev = dev;
1011 vlan->port = port;
1012 vlan->set_features = MACVLAN_FEATURES;
1013 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1014
1015 vlan->mode = MACVLAN_MODE_VEPA;
1016 if (data && data[IFLA_MACVLAN_MODE])
1017 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1018
1019 if (data && data[IFLA_MACVLAN_FLAGS])
1020 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1021
1022 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1023 if (port->count)
1024 return -EINVAL;
1025 port->passthru = true;
1026 eth_hw_addr_inherit(dev, lowerdev);
1027 }
1028
1029 port->count += 1;
1030 err = register_netdevice(dev);
1031 if (err < 0)
1032 goto destroy_port;
1033
1034 dev->priv_flags |= IFF_MACVLAN;
1035 err = netdev_upper_dev_link(lowerdev, dev);
1036 if (err)
1037 goto unregister_netdev;
1038
1039 list_add_tail_rcu(&vlan->list, &port->vlans);
1040 netif_stacked_transfer_operstate(lowerdev, dev);
1041
1042 return 0;
1043
1044 unregister_netdev:
1045 unregister_netdevice(dev);
1046 destroy_port:
1047 port->count -= 1;
1048 if (!port->count)
1049 macvlan_port_destroy(lowerdev);
1050
1051 return err;
1052 }
1053 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1054
1055 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1056 struct nlattr *tb[], struct nlattr *data[])
1057 {
1058 return macvlan_common_newlink(src_net, dev, tb, data);
1059 }
1060
1061 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1062 {
1063 struct macvlan_dev *vlan = netdev_priv(dev);
1064
1065 list_del_rcu(&vlan->list);
1066 unregister_netdevice_queue(dev, head);
1067 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1068 }
1069 EXPORT_SYMBOL_GPL(macvlan_dellink);
1070
1071 static int macvlan_changelink(struct net_device *dev,
1072 struct nlattr *tb[], struct nlattr *data[])
1073 {
1074 struct macvlan_dev *vlan = netdev_priv(dev);
1075 enum macvlan_mode mode;
1076 bool set_mode = false;
1077
1078 /* Validate mode, but don't set yet: setting flags may fail. */
1079 if (data && data[IFLA_MACVLAN_MODE]) {
1080 set_mode = true;
1081 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1082 /* Passthrough mode can't be set or cleared dynamically */
1083 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1084 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1085 return -EINVAL;
1086 }
1087
1088 if (data && data[IFLA_MACVLAN_FLAGS]) {
1089 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1090 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1091 if (vlan->port->passthru && promisc) {
1092 int err;
1093
1094 if (flags & MACVLAN_FLAG_NOPROMISC)
1095 err = dev_set_promiscuity(vlan->lowerdev, -1);
1096 else
1097 err = dev_set_promiscuity(vlan->lowerdev, 1);
1098 if (err < 0)
1099 return err;
1100 }
1101 vlan->flags = flags;
1102 }
1103 if (set_mode)
1104 vlan->mode = mode;
1105 return 0;
1106 }
1107
1108 static size_t macvlan_get_size(const struct net_device *dev)
1109 {
1110 return (0
1111 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1112 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1113 );
1114 }
1115
1116 static int macvlan_fill_info(struct sk_buff *skb,
1117 const struct net_device *dev)
1118 {
1119 struct macvlan_dev *vlan = netdev_priv(dev);
1120
1121 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1122 goto nla_put_failure;
1123 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1124 goto nla_put_failure;
1125 return 0;
1126
1127 nla_put_failure:
1128 return -EMSGSIZE;
1129 }
1130
1131 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1132 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1133 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1134 };
1135
1136 int macvlan_link_register(struct rtnl_link_ops *ops)
1137 {
1138 /* common fields */
1139 ops->priv_size = sizeof(struct macvlan_dev);
1140 ops->validate = macvlan_validate;
1141 ops->maxtype = IFLA_MACVLAN_MAX;
1142 ops->policy = macvlan_policy;
1143 ops->changelink = macvlan_changelink;
1144 ops->get_size = macvlan_get_size;
1145 ops->fill_info = macvlan_fill_info;
1146
1147 return rtnl_link_register(ops);
1148 };
1149 EXPORT_SYMBOL_GPL(macvlan_link_register);
1150
1151 static struct rtnl_link_ops macvlan_link_ops = {
1152 .kind = "macvlan",
1153 .setup = macvlan_setup,
1154 .newlink = macvlan_newlink,
1155 .dellink = macvlan_dellink,
1156 };
1157
1158 static int macvlan_device_event(struct notifier_block *unused,
1159 unsigned long event, void *ptr)
1160 {
1161 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1162 struct macvlan_dev *vlan, *next;
1163 struct macvlan_port *port;
1164 LIST_HEAD(list_kill);
1165
1166 if (!macvlan_port_exists(dev))
1167 return NOTIFY_DONE;
1168
1169 port = macvlan_port_get_rtnl(dev);
1170
1171 switch (event) {
1172 case NETDEV_CHANGE:
1173 list_for_each_entry(vlan, &port->vlans, list)
1174 netif_stacked_transfer_operstate(vlan->lowerdev,
1175 vlan->dev);
1176 break;
1177 case NETDEV_FEAT_CHANGE:
1178 list_for_each_entry(vlan, &port->vlans, list) {
1179 vlan->dev->gso_max_size = dev->gso_max_size;
1180 netdev_update_features(vlan->dev);
1181 }
1182 break;
1183 case NETDEV_CHANGEMTU:
1184 list_for_each_entry(vlan, &port->vlans, list) {
1185 if (vlan->dev->mtu <= dev->mtu)
1186 continue;
1187 dev_set_mtu(vlan->dev, dev->mtu);
1188 }
1189 break;
1190 case NETDEV_CHANGEADDR:
1191 if (!port->passthru)
1192 return NOTIFY_DONE;
1193
1194 vlan = list_first_entry_or_null(&port->vlans,
1195 struct macvlan_dev,
1196 list);
1197
1198 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1199 return NOTIFY_BAD;
1200
1201 break;
1202 case NETDEV_UNREGISTER:
1203 /* twiddle thumbs on netns device moves */
1204 if (dev->reg_state != NETREG_UNREGISTERING)
1205 break;
1206
1207 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1208 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1209 unregister_netdevice_many(&list_kill);
1210 break;
1211 case NETDEV_PRE_TYPE_CHANGE:
1212 /* Forbid underlaying device to change its type. */
1213 return NOTIFY_BAD;
1214
1215 case NETDEV_NOTIFY_PEERS:
1216 case NETDEV_BONDING_FAILOVER:
1217 case NETDEV_RESEND_IGMP:
1218 /* Propagate to all vlans */
1219 list_for_each_entry(vlan, &port->vlans, list)
1220 call_netdevice_notifiers(event, vlan->dev);
1221 }
1222 return NOTIFY_DONE;
1223 }
1224
1225 static struct notifier_block macvlan_notifier_block __read_mostly = {
1226 .notifier_call = macvlan_device_event,
1227 };
1228
1229 static int __init macvlan_init_module(void)
1230 {
1231 int err;
1232
1233 register_netdevice_notifier(&macvlan_notifier_block);
1234
1235 err = macvlan_link_register(&macvlan_link_ops);
1236 if (err < 0)
1237 goto err1;
1238 return 0;
1239 err1:
1240 unregister_netdevice_notifier(&macvlan_notifier_block);
1241 return err;
1242 }
1243
1244 static void __exit macvlan_cleanup_module(void)
1245 {
1246 rtnl_link_unregister(&macvlan_link_ops);
1247 unregister_netdevice_notifier(&macvlan_notifier_block);
1248 }
1249
1250 module_init(macvlan_init_module);
1251 module_exit(macvlan_cleanup_module);
1252
1253 MODULE_LICENSE("GPL");
1254 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1255 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1256 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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