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Merge branch 'ethtool-rssh-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-jammy-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 <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 };
49
50 #define MACVLAN_PORT_IS_EMPTY(port) list_empty(&port->vlans)
51
52 struct macvlan_skb_cb {
53 const struct macvlan_dev *src;
54 };
55
56 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
57
58 static void macvlan_port_destroy(struct net_device *dev);
59
60 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
61 {
62 return rcu_dereference(dev->rx_handler_data);
63 }
64
65 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
66 {
67 return rtnl_dereference(dev->rx_handler_data);
68 }
69
70 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
71
72 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
73 const unsigned char *addr)
74 {
75 struct macvlan_dev *vlan;
76
77 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
78 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
79 return vlan;
80 }
81 return NULL;
82 }
83
84 static void macvlan_hash_add(struct macvlan_dev *vlan)
85 {
86 struct macvlan_port *port = vlan->port;
87 const unsigned char *addr = vlan->dev->dev_addr;
88
89 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
90 }
91
92 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
93 {
94 hlist_del_rcu(&vlan->hlist);
95 if (sync)
96 synchronize_rcu();
97 }
98
99 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
100 const unsigned char *addr)
101 {
102 macvlan_hash_del(vlan, true);
103 /* Now that we are unhashed it is safe to change the device
104 * address without confusing packet delivery.
105 */
106 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
107 macvlan_hash_add(vlan);
108 }
109
110 static int macvlan_addr_busy(const struct macvlan_port *port,
111 const unsigned char *addr)
112 {
113 /* Test to see if the specified multicast address is
114 * currently in use by the underlying device or
115 * another macvlan.
116 */
117 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
118 return 1;
119
120 if (macvlan_hash_lookup(port, addr))
121 return 1;
122
123 return 0;
124 }
125
126
127 static int macvlan_broadcast_one(struct sk_buff *skb,
128 const struct macvlan_dev *vlan,
129 const struct ethhdr *eth, bool local)
130 {
131 struct net_device *dev = vlan->dev;
132
133 if (local)
134 return __dev_forward_skb(dev, skb);
135
136 skb->dev = dev;
137 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
138 skb->pkt_type = PACKET_BROADCAST;
139 else
140 skb->pkt_type = PACKET_MULTICAST;
141
142 return 0;
143 }
144
145 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
146 {
147 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
148 }
149
150
151 static unsigned int mc_hash(const struct macvlan_dev *vlan,
152 const unsigned char *addr)
153 {
154 u32 val = __get_unaligned_cpu32(addr + 2);
155
156 val ^= macvlan_hash_mix(vlan);
157 return hash_32(val, MACVLAN_MC_FILTER_BITS);
158 }
159
160 static void macvlan_broadcast(struct sk_buff *skb,
161 const struct macvlan_port *port,
162 struct net_device *src,
163 enum macvlan_mode mode)
164 {
165 const struct ethhdr *eth = eth_hdr(skb);
166 const struct macvlan_dev *vlan;
167 struct sk_buff *nskb;
168 unsigned int i;
169 int err;
170 unsigned int hash;
171
172 if (skb->protocol == htons(ETH_P_PAUSE))
173 return;
174
175 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
176 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
177 if (vlan->dev == src || !(vlan->mode & mode))
178 continue;
179
180 hash = mc_hash(vlan, eth->h_dest);
181 if (!test_bit(hash, vlan->mc_filter))
182 continue;
183
184 err = NET_RX_DROP;
185 nskb = skb_clone(skb, GFP_ATOMIC);
186 if (likely(nskb))
187 err = macvlan_broadcast_one(
188 nskb, vlan, eth,
189 mode == MACVLAN_MODE_BRIDGE) ?:
190 netif_rx_ni(nskb);
191 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
192 err == NET_RX_SUCCESS, 1);
193 }
194 }
195 }
196
197 static void macvlan_process_broadcast(struct work_struct *w)
198 {
199 struct macvlan_port *port = container_of(w, struct macvlan_port,
200 bc_work);
201 struct sk_buff *skb;
202 struct sk_buff_head list;
203
204 skb_queue_head_init(&list);
205
206 spin_lock_bh(&port->bc_queue.lock);
207 skb_queue_splice_tail_init(&port->bc_queue, &list);
208 spin_unlock_bh(&port->bc_queue.lock);
209
210 while ((skb = __skb_dequeue(&list))) {
211 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
212
213 rcu_read_lock();
214
215 if (!src)
216 /* frame comes from an external address */
217 macvlan_broadcast(skb, port, NULL,
218 MACVLAN_MODE_PRIVATE |
219 MACVLAN_MODE_VEPA |
220 MACVLAN_MODE_PASSTHRU|
221 MACVLAN_MODE_BRIDGE);
222 else if (src->mode == MACVLAN_MODE_VEPA)
223 /* flood to everyone except source */
224 macvlan_broadcast(skb, port, src->dev,
225 MACVLAN_MODE_VEPA |
226 MACVLAN_MODE_BRIDGE);
227 else
228 /*
229 * flood only to VEPA ports, bridge ports
230 * already saw the frame on the way out.
231 */
232 macvlan_broadcast(skb, port, src->dev,
233 MACVLAN_MODE_VEPA);
234
235 rcu_read_unlock();
236
237 kfree_skb(skb);
238 }
239 }
240
241 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
242 struct sk_buff *skb)
243 {
244 struct sk_buff *nskb;
245 int err = -ENOMEM;
246
247 nskb = skb_clone(skb, GFP_ATOMIC);
248 if (!nskb)
249 goto err;
250
251 spin_lock(&port->bc_queue.lock);
252 if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) {
253 __skb_queue_tail(&port->bc_queue, nskb);
254 err = 0;
255 }
256 spin_unlock(&port->bc_queue.lock);
257
258 if (err)
259 goto free_nskb;
260
261 schedule_work(&port->bc_work);
262 return;
263
264 free_nskb:
265 kfree_skb(nskb);
266 err:
267 atomic_long_inc(&skb->dev->rx_dropped);
268 }
269
270 /* called under rcu_read_lock() from netif_receive_skb */
271 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
272 {
273 struct macvlan_port *port;
274 struct sk_buff *skb = *pskb;
275 const struct ethhdr *eth = eth_hdr(skb);
276 const struct macvlan_dev *vlan;
277 const struct macvlan_dev *src;
278 struct net_device *dev;
279 unsigned int len = 0;
280 int ret = NET_RX_DROP;
281
282 port = macvlan_port_get_rcu(skb->dev);
283 if (is_multicast_ether_addr(eth->h_dest)) {
284 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
285 if (!skb)
286 return RX_HANDLER_CONSUMED;
287 eth = eth_hdr(skb);
288 src = macvlan_hash_lookup(port, eth->h_source);
289 if (src && src->mode != MACVLAN_MODE_VEPA &&
290 src->mode != MACVLAN_MODE_BRIDGE) {
291 /* forward to original port. */
292 vlan = src;
293 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
294 netif_rx(skb);
295 goto out;
296 }
297
298 MACVLAN_SKB_CB(skb)->src = src;
299 macvlan_broadcast_enqueue(port, skb);
300
301 return RX_HANDLER_PASS;
302 }
303
304 if (port->passthru)
305 vlan = list_first_or_null_rcu(&port->vlans,
306 struct macvlan_dev, list);
307 else
308 vlan = macvlan_hash_lookup(port, eth->h_dest);
309 if (vlan == NULL)
310 return RX_HANDLER_PASS;
311
312 dev = vlan->dev;
313 if (unlikely(!(dev->flags & IFF_UP))) {
314 kfree_skb(skb);
315 return RX_HANDLER_CONSUMED;
316 }
317 len = skb->len + ETH_HLEN;
318 skb = skb_share_check(skb, GFP_ATOMIC);
319 if (!skb)
320 goto out;
321
322 skb->dev = dev;
323 skb->pkt_type = PACKET_HOST;
324
325 ret = netif_rx(skb);
326
327 out:
328 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
329 return RX_HANDLER_CONSUMED;
330 }
331
332 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
333 {
334 const struct macvlan_dev *vlan = netdev_priv(dev);
335 const struct macvlan_port *port = vlan->port;
336 const struct macvlan_dev *dest;
337
338 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
339 const struct ethhdr *eth = (void *)skb->data;
340
341 /* send to other bridge ports directly */
342 if (is_multicast_ether_addr(eth->h_dest)) {
343 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
344 goto xmit_world;
345 }
346
347 dest = macvlan_hash_lookup(port, eth->h_dest);
348 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
349 /* send to lowerdev first for its network taps */
350 dev_forward_skb(vlan->lowerdev, skb);
351
352 return NET_XMIT_SUCCESS;
353 }
354 }
355
356 xmit_world:
357 skb->dev = vlan->lowerdev;
358 return dev_queue_xmit(skb);
359 }
360
361 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
362 {
363 #ifdef CONFIG_NET_POLL_CONTROLLER
364 if (vlan->netpoll)
365 netpoll_send_skb(vlan->netpoll, skb);
366 #else
367 BUG();
368 #endif
369 return NETDEV_TX_OK;
370 }
371
372 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
373 struct net_device *dev)
374 {
375 unsigned int len = skb->len;
376 int ret;
377 struct macvlan_dev *vlan = netdev_priv(dev);
378
379 if (unlikely(netpoll_tx_running(dev)))
380 return macvlan_netpoll_send_skb(vlan, skb);
381
382 if (vlan->fwd_priv) {
383 skb->dev = vlan->lowerdev;
384 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
385 } else {
386 ret = macvlan_queue_xmit(skb, dev);
387 }
388
389 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
390 struct vlan_pcpu_stats *pcpu_stats;
391
392 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
393 u64_stats_update_begin(&pcpu_stats->syncp);
394 pcpu_stats->tx_packets++;
395 pcpu_stats->tx_bytes += len;
396 u64_stats_update_end(&pcpu_stats->syncp);
397 } else {
398 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
399 }
400 return ret;
401 }
402
403 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
404 unsigned short type, const void *daddr,
405 const void *saddr, unsigned len)
406 {
407 const struct macvlan_dev *vlan = netdev_priv(dev);
408 struct net_device *lowerdev = vlan->lowerdev;
409
410 return dev_hard_header(skb, lowerdev, type, daddr,
411 saddr ? : dev->dev_addr, len);
412 }
413
414 static const struct header_ops macvlan_hard_header_ops = {
415 .create = macvlan_hard_header,
416 .rebuild = eth_rebuild_header,
417 .parse = eth_header_parse,
418 .cache = eth_header_cache,
419 .cache_update = eth_header_cache_update,
420 };
421
422 static struct rtnl_link_ops macvlan_link_ops;
423
424 static int macvlan_open(struct net_device *dev)
425 {
426 struct macvlan_dev *vlan = netdev_priv(dev);
427 struct net_device *lowerdev = vlan->lowerdev;
428 int err;
429
430 if (vlan->port->passthru) {
431 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
432 err = dev_set_promiscuity(lowerdev, 1);
433 if (err < 0)
434 goto out;
435 }
436 goto hash_add;
437 }
438
439 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
440 dev->rtnl_link_ops == &macvlan_link_ops) {
441 vlan->fwd_priv =
442 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
443
444 /* If we get a NULL pointer back, or if we get an error
445 * then we should just fall through to the non accelerated path
446 */
447 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
448 vlan->fwd_priv = NULL;
449 } else
450 return 0;
451 }
452
453 err = -EBUSY;
454 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
455 goto out;
456
457 err = dev_uc_add(lowerdev, dev->dev_addr);
458 if (err < 0)
459 goto out;
460 if (dev->flags & IFF_ALLMULTI) {
461 err = dev_set_allmulti(lowerdev, 1);
462 if (err < 0)
463 goto del_unicast;
464 }
465
466 hash_add:
467 macvlan_hash_add(vlan);
468 return 0;
469
470 del_unicast:
471 dev_uc_del(lowerdev, dev->dev_addr);
472 out:
473 if (vlan->fwd_priv) {
474 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
475 vlan->fwd_priv);
476 vlan->fwd_priv = NULL;
477 }
478 return err;
479 }
480
481 static int macvlan_stop(struct net_device *dev)
482 {
483 struct macvlan_dev *vlan = netdev_priv(dev);
484 struct net_device *lowerdev = vlan->lowerdev;
485
486 if (vlan->fwd_priv) {
487 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
488 vlan->fwd_priv);
489 vlan->fwd_priv = NULL;
490 return 0;
491 }
492
493 dev_uc_unsync(lowerdev, dev);
494 dev_mc_unsync(lowerdev, dev);
495
496 if (vlan->port->passthru) {
497 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
498 dev_set_promiscuity(lowerdev, -1);
499 goto hash_del;
500 }
501
502 if (dev->flags & IFF_ALLMULTI)
503 dev_set_allmulti(lowerdev, -1);
504
505 dev_uc_del(lowerdev, dev->dev_addr);
506
507 hash_del:
508 macvlan_hash_del(vlan, !dev->dismantle);
509 return 0;
510 }
511
512 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
513 {
514 struct macvlan_dev *vlan = netdev_priv(dev);
515 struct net_device *lowerdev = vlan->lowerdev;
516 int err;
517
518 if (!(dev->flags & IFF_UP)) {
519 /* Just copy in the new address */
520 ether_addr_copy(dev->dev_addr, addr);
521 } else {
522 /* Rehash and update the device filters */
523 if (macvlan_addr_busy(vlan->port, addr))
524 return -EBUSY;
525
526 if (!vlan->port->passthru) {
527 err = dev_uc_add(lowerdev, addr);
528 if (err)
529 return err;
530
531 dev_uc_del(lowerdev, dev->dev_addr);
532 }
533
534 macvlan_hash_change_addr(vlan, addr);
535 }
536 return 0;
537 }
538
539 static int macvlan_set_mac_address(struct net_device *dev, void *p)
540 {
541 struct macvlan_dev *vlan = netdev_priv(dev);
542 struct sockaddr *addr = p;
543
544 if (!is_valid_ether_addr(addr->sa_data))
545 return -EADDRNOTAVAIL;
546
547 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
548 dev_set_mac_address(vlan->lowerdev, addr);
549 return 0;
550 }
551
552 return macvlan_sync_address(dev, addr->sa_data);
553 }
554
555 static void macvlan_change_rx_flags(struct net_device *dev, int change)
556 {
557 struct macvlan_dev *vlan = netdev_priv(dev);
558 struct net_device *lowerdev = vlan->lowerdev;
559
560 if (dev->flags & IFF_UP) {
561 if (change & IFF_ALLMULTI)
562 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
563 }
564 }
565
566 static void macvlan_set_mac_lists(struct net_device *dev)
567 {
568 struct macvlan_dev *vlan = netdev_priv(dev);
569
570 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
571 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
572 } else {
573 struct netdev_hw_addr *ha;
574 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
575
576 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
577 netdev_for_each_mc_addr(ha, dev) {
578 __set_bit(mc_hash(vlan, ha->addr), filter);
579 }
580
581 __set_bit(mc_hash(vlan, dev->broadcast), filter);
582
583 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
584 }
585 dev_uc_sync(vlan->lowerdev, dev);
586 dev_mc_sync(vlan->lowerdev, dev);
587 }
588
589 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
590 {
591 struct macvlan_dev *vlan = netdev_priv(dev);
592
593 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
594 return -EINVAL;
595 dev->mtu = new_mtu;
596 return 0;
597 }
598
599 /*
600 * macvlan network devices have devices nesting below it and are a special
601 * "super class" of normal network devices; split their locks off into a
602 * separate class since they always nest.
603 */
604 static struct lock_class_key macvlan_netdev_xmit_lock_key;
605 static struct lock_class_key macvlan_netdev_addr_lock_key;
606
607 #define ALWAYS_ON_FEATURES \
608 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
609
610 #define MACVLAN_FEATURES \
611 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
612 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
613 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
614 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
615
616 #define MACVLAN_STATE_MASK \
617 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
618
619 static int macvlan_get_nest_level(struct net_device *dev)
620 {
621 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
622 }
623
624 static void macvlan_set_lockdep_class_one(struct net_device *dev,
625 struct netdev_queue *txq,
626 void *_unused)
627 {
628 lockdep_set_class(&txq->_xmit_lock,
629 &macvlan_netdev_xmit_lock_key);
630 }
631
632 static void macvlan_set_lockdep_class(struct net_device *dev)
633 {
634 lockdep_set_class_and_subclass(&dev->addr_list_lock,
635 &macvlan_netdev_addr_lock_key,
636 macvlan_get_nest_level(dev));
637 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
638 }
639
640 static int macvlan_init(struct net_device *dev)
641 {
642 struct macvlan_dev *vlan = netdev_priv(dev);
643 const struct net_device *lowerdev = vlan->lowerdev;
644
645 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
646 (lowerdev->state & MACVLAN_STATE_MASK);
647 dev->features = lowerdev->features & MACVLAN_FEATURES;
648 dev->features |= ALWAYS_ON_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 if (MACVLAN_PORT_IS_EMPTY(port))
670 macvlan_port_destroy(port->dev);
671 }
672
673 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
674 struct rtnl_link_stats64 *stats)
675 {
676 struct macvlan_dev *vlan = netdev_priv(dev);
677
678 if (vlan->pcpu_stats) {
679 struct vlan_pcpu_stats *p;
680 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
681 u32 rx_errors = 0, tx_dropped = 0;
682 unsigned int start;
683 int i;
684
685 for_each_possible_cpu(i) {
686 p = per_cpu_ptr(vlan->pcpu_stats, i);
687 do {
688 start = u64_stats_fetch_begin_irq(&p->syncp);
689 rx_packets = p->rx_packets;
690 rx_bytes = p->rx_bytes;
691 rx_multicast = p->rx_multicast;
692 tx_packets = p->tx_packets;
693 tx_bytes = p->tx_bytes;
694 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
695
696 stats->rx_packets += rx_packets;
697 stats->rx_bytes += rx_bytes;
698 stats->multicast += rx_multicast;
699 stats->tx_packets += tx_packets;
700 stats->tx_bytes += tx_bytes;
701 /* rx_errors & tx_dropped are u32, updated
702 * without syncp protection.
703 */
704 rx_errors += p->rx_errors;
705 tx_dropped += p->tx_dropped;
706 }
707 stats->rx_errors = rx_errors;
708 stats->rx_dropped = rx_errors;
709 stats->tx_dropped = tx_dropped;
710 }
711 return stats;
712 }
713
714 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
715 __be16 proto, u16 vid)
716 {
717 struct macvlan_dev *vlan = netdev_priv(dev);
718 struct net_device *lowerdev = vlan->lowerdev;
719
720 return vlan_vid_add(lowerdev, proto, vid);
721 }
722
723 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
724 __be16 proto, u16 vid)
725 {
726 struct macvlan_dev *vlan = netdev_priv(dev);
727 struct net_device *lowerdev = vlan->lowerdev;
728
729 vlan_vid_del(lowerdev, proto, vid);
730 return 0;
731 }
732
733 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
734 struct net_device *dev,
735 const unsigned char *addr,
736 u16 flags)
737 {
738 struct macvlan_dev *vlan = netdev_priv(dev);
739 int err = -EINVAL;
740
741 if (!vlan->port->passthru)
742 return -EOPNOTSUPP;
743
744 if (flags & NLM_F_REPLACE)
745 return -EOPNOTSUPP;
746
747 if (is_unicast_ether_addr(addr))
748 err = dev_uc_add_excl(dev, addr);
749 else if (is_multicast_ether_addr(addr))
750 err = dev_mc_add_excl(dev, addr);
751
752 return err;
753 }
754
755 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
756 struct net_device *dev,
757 const unsigned char *addr)
758 {
759 struct macvlan_dev *vlan = netdev_priv(dev);
760 int err = -EINVAL;
761
762 if (!vlan->port->passthru)
763 return -EOPNOTSUPP;
764
765 if (is_unicast_ether_addr(addr))
766 err = dev_uc_del(dev, addr);
767 else if (is_multicast_ether_addr(addr))
768 err = dev_mc_del(dev, addr);
769
770 return err;
771 }
772
773 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
774 struct ethtool_drvinfo *drvinfo)
775 {
776 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
777 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
778 }
779
780 static int macvlan_ethtool_get_settings(struct net_device *dev,
781 struct ethtool_cmd *cmd)
782 {
783 const struct macvlan_dev *vlan = netdev_priv(dev);
784
785 return __ethtool_get_settings(vlan->lowerdev, cmd);
786 }
787
788 static netdev_features_t macvlan_fix_features(struct net_device *dev,
789 netdev_features_t features)
790 {
791 struct macvlan_dev *vlan = netdev_priv(dev);
792 netdev_features_t mask;
793
794 features |= NETIF_F_ALL_FOR_ALL;
795 features &= (vlan->set_features | ~MACVLAN_FEATURES);
796 mask = features;
797
798 features = netdev_increment_features(vlan->lowerdev->features,
799 features,
800 mask);
801 features |= ALWAYS_ON_FEATURES;
802
803 return features;
804 }
805
806 #ifdef CONFIG_NET_POLL_CONTROLLER
807 static void macvlan_dev_poll_controller(struct net_device *dev)
808 {
809 return;
810 }
811
812 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
813 {
814 struct macvlan_dev *vlan = netdev_priv(dev);
815 struct net_device *real_dev = vlan->lowerdev;
816 struct netpoll *netpoll;
817 int err = 0;
818
819 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
820 err = -ENOMEM;
821 if (!netpoll)
822 goto out;
823
824 err = __netpoll_setup(netpoll, real_dev);
825 if (err) {
826 kfree(netpoll);
827 goto out;
828 }
829
830 vlan->netpoll = netpoll;
831
832 out:
833 return err;
834 }
835
836 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
837 {
838 struct macvlan_dev *vlan = netdev_priv(dev);
839 struct netpoll *netpoll = vlan->netpoll;
840
841 if (!netpoll)
842 return;
843
844 vlan->netpoll = NULL;
845
846 __netpoll_free_async(netpoll);
847 }
848 #endif /* CONFIG_NET_POLL_CONTROLLER */
849
850 static const struct ethtool_ops macvlan_ethtool_ops = {
851 .get_link = ethtool_op_get_link,
852 .get_settings = macvlan_ethtool_get_settings,
853 .get_drvinfo = macvlan_ethtool_get_drvinfo,
854 };
855
856 static const struct net_device_ops macvlan_netdev_ops = {
857 .ndo_init = macvlan_init,
858 .ndo_uninit = macvlan_uninit,
859 .ndo_open = macvlan_open,
860 .ndo_stop = macvlan_stop,
861 .ndo_start_xmit = macvlan_start_xmit,
862 .ndo_change_mtu = macvlan_change_mtu,
863 .ndo_fix_features = macvlan_fix_features,
864 .ndo_change_rx_flags = macvlan_change_rx_flags,
865 .ndo_set_mac_address = macvlan_set_mac_address,
866 .ndo_set_rx_mode = macvlan_set_mac_lists,
867 .ndo_get_stats64 = macvlan_dev_get_stats64,
868 .ndo_validate_addr = eth_validate_addr,
869 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
870 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
871 .ndo_fdb_add = macvlan_fdb_add,
872 .ndo_fdb_del = macvlan_fdb_del,
873 .ndo_fdb_dump = ndo_dflt_fdb_dump,
874 .ndo_get_lock_subclass = macvlan_get_nest_level,
875 #ifdef CONFIG_NET_POLL_CONTROLLER
876 .ndo_poll_controller = macvlan_dev_poll_controller,
877 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
878 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
879 #endif
880 };
881
882 void macvlan_common_setup(struct net_device *dev)
883 {
884 ether_setup(dev);
885
886 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
887 dev->priv_flags |= IFF_UNICAST_FLT;
888 dev->netdev_ops = &macvlan_netdev_ops;
889 dev->destructor = free_netdev;
890 dev->header_ops = &macvlan_hard_header_ops;
891 dev->ethtool_ops = &macvlan_ethtool_ops;
892 }
893 EXPORT_SYMBOL_GPL(macvlan_common_setup);
894
895 static void macvlan_setup(struct net_device *dev)
896 {
897 macvlan_common_setup(dev);
898 dev->tx_queue_len = 0;
899 }
900
901 static int macvlan_port_create(struct net_device *dev)
902 {
903 struct macvlan_port *port;
904 unsigned int i;
905 int err;
906
907 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
908 return -EINVAL;
909
910 port = kzalloc(sizeof(*port), GFP_KERNEL);
911 if (port == NULL)
912 return -ENOMEM;
913
914 port->passthru = false;
915 port->dev = dev;
916 INIT_LIST_HEAD(&port->vlans);
917 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
918 INIT_HLIST_HEAD(&port->vlan_hash[i]);
919
920 skb_queue_head_init(&port->bc_queue);
921 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
922
923 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
924 if (err)
925 kfree(port);
926 else
927 dev->priv_flags |= IFF_MACVLAN_PORT;
928 return err;
929 }
930
931 static void macvlan_port_destroy(struct net_device *dev)
932 {
933 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
934
935 cancel_work_sync(&port->bc_work);
936 dev->priv_flags &= ~IFF_MACVLAN_PORT;
937 netdev_rx_handler_unregister(dev);
938 kfree_rcu(port, rcu);
939 }
940
941 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
942 {
943 if (tb[IFLA_ADDRESS]) {
944 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
945 return -EINVAL;
946 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
947 return -EADDRNOTAVAIL;
948 }
949
950 if (data && data[IFLA_MACVLAN_FLAGS] &&
951 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
952 return -EINVAL;
953
954 if (data && data[IFLA_MACVLAN_MODE]) {
955 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
956 case MACVLAN_MODE_PRIVATE:
957 case MACVLAN_MODE_VEPA:
958 case MACVLAN_MODE_BRIDGE:
959 case MACVLAN_MODE_PASSTHRU:
960 break;
961 default:
962 return -EINVAL;
963 }
964 }
965 return 0;
966 }
967
968 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
969 struct nlattr *tb[], struct nlattr *data[])
970 {
971 struct macvlan_dev *vlan = netdev_priv(dev);
972 struct macvlan_port *port;
973 struct net_device *lowerdev;
974 int err;
975
976 if (!tb[IFLA_LINK])
977 return -EINVAL;
978
979 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
980 if (lowerdev == NULL)
981 return -ENODEV;
982
983 /* When creating macvlans or macvtaps on top of other macvlans - use
984 * the real device as the lowerdev.
985 */
986 if (netif_is_macvlan(lowerdev))
987 lowerdev = macvlan_dev_real_dev(lowerdev);
988
989 if (!tb[IFLA_MTU])
990 dev->mtu = lowerdev->mtu;
991 else if (dev->mtu > lowerdev->mtu)
992 return -EINVAL;
993
994 if (!tb[IFLA_ADDRESS])
995 eth_hw_addr_random(dev);
996
997 if (!macvlan_port_exists(lowerdev)) {
998 err = macvlan_port_create(lowerdev);
999 if (err < 0)
1000 return err;
1001 }
1002 port = macvlan_port_get_rtnl(lowerdev);
1003
1004 /* Only 1 macvlan device can be created in passthru mode */
1005 if (port->passthru)
1006 return -EINVAL;
1007
1008 vlan->lowerdev = lowerdev;
1009 vlan->dev = dev;
1010 vlan->port = port;
1011 vlan->set_features = MACVLAN_FEATURES;
1012 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1013
1014 vlan->mode = MACVLAN_MODE_VEPA;
1015 if (data && data[IFLA_MACVLAN_MODE])
1016 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1017
1018 if (data && data[IFLA_MACVLAN_FLAGS])
1019 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1020
1021 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1022 if (!MACVLAN_PORT_IS_EMPTY(port))
1023 return -EINVAL;
1024 port->passthru = true;
1025 eth_hw_addr_inherit(dev, lowerdev);
1026 }
1027
1028 err = register_netdevice(dev);
1029 if (err < 0)
1030 goto destroy_port;
1031
1032 dev->priv_flags |= IFF_MACVLAN;
1033 err = netdev_upper_dev_link(lowerdev, dev);
1034 if (err)
1035 goto unregister_netdev;
1036
1037 list_add_tail_rcu(&vlan->list, &port->vlans);
1038 netif_stacked_transfer_operstate(lowerdev, dev);
1039
1040 return 0;
1041
1042 unregister_netdev:
1043 unregister_netdevice(dev);
1044 destroy_port:
1045 if (MACVLAN_PORT_IS_EMPTY(port))
1046 macvlan_port_destroy(lowerdev);
1047
1048 return err;
1049 }
1050 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1051
1052 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1053 struct nlattr *tb[], struct nlattr *data[])
1054 {
1055 return macvlan_common_newlink(src_net, dev, tb, data);
1056 }
1057
1058 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1059 {
1060 struct macvlan_dev *vlan = netdev_priv(dev);
1061
1062 list_del_rcu(&vlan->list);
1063 unregister_netdevice_queue(dev, head);
1064 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1065 }
1066 EXPORT_SYMBOL_GPL(macvlan_dellink);
1067
1068 static int macvlan_changelink(struct net_device *dev,
1069 struct nlattr *tb[], struct nlattr *data[])
1070 {
1071 struct macvlan_dev *vlan = netdev_priv(dev);
1072 enum macvlan_mode mode;
1073 bool set_mode = false;
1074
1075 /* Validate mode, but don't set yet: setting flags may fail. */
1076 if (data && data[IFLA_MACVLAN_MODE]) {
1077 set_mode = true;
1078 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1079 /* Passthrough mode can't be set or cleared dynamically */
1080 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1081 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1082 return -EINVAL;
1083 }
1084
1085 if (data && data[IFLA_MACVLAN_FLAGS]) {
1086 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1087 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1088 if (vlan->port->passthru && promisc) {
1089 int err;
1090
1091 if (flags & MACVLAN_FLAG_NOPROMISC)
1092 err = dev_set_promiscuity(vlan->lowerdev, -1);
1093 else
1094 err = dev_set_promiscuity(vlan->lowerdev, 1);
1095 if (err < 0)
1096 return err;
1097 }
1098 vlan->flags = flags;
1099 }
1100 if (set_mode)
1101 vlan->mode = mode;
1102 return 0;
1103 }
1104
1105 static size_t macvlan_get_size(const struct net_device *dev)
1106 {
1107 return (0
1108 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1109 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1110 );
1111 }
1112
1113 static int macvlan_fill_info(struct sk_buff *skb,
1114 const struct net_device *dev)
1115 {
1116 struct macvlan_dev *vlan = netdev_priv(dev);
1117
1118 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1119 goto nla_put_failure;
1120 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1121 goto nla_put_failure;
1122 return 0;
1123
1124 nla_put_failure:
1125 return -EMSGSIZE;
1126 }
1127
1128 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1129 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1130 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1131 };
1132
1133 int macvlan_link_register(struct rtnl_link_ops *ops)
1134 {
1135 /* common fields */
1136 ops->priv_size = sizeof(struct macvlan_dev);
1137 ops->validate = macvlan_validate;
1138 ops->maxtype = IFLA_MACVLAN_MAX;
1139 ops->policy = macvlan_policy;
1140 ops->changelink = macvlan_changelink;
1141 ops->get_size = macvlan_get_size;
1142 ops->fill_info = macvlan_fill_info;
1143
1144 return rtnl_link_register(ops);
1145 };
1146 EXPORT_SYMBOL_GPL(macvlan_link_register);
1147
1148 static struct rtnl_link_ops macvlan_link_ops = {
1149 .kind = "macvlan",
1150 .setup = macvlan_setup,
1151 .newlink = macvlan_newlink,
1152 .dellink = macvlan_dellink,
1153 };
1154
1155 static int macvlan_device_event(struct notifier_block *unused,
1156 unsigned long event, void *ptr)
1157 {
1158 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1159 struct macvlan_dev *vlan, *next;
1160 struct macvlan_port *port;
1161 LIST_HEAD(list_kill);
1162
1163 if (!macvlan_port_exists(dev))
1164 return NOTIFY_DONE;
1165
1166 port = macvlan_port_get_rtnl(dev);
1167
1168 switch (event) {
1169 case NETDEV_CHANGE:
1170 list_for_each_entry(vlan, &port->vlans, list)
1171 netif_stacked_transfer_operstate(vlan->lowerdev,
1172 vlan->dev);
1173 break;
1174 case NETDEV_FEAT_CHANGE:
1175 list_for_each_entry(vlan, &port->vlans, list) {
1176 vlan->dev->gso_max_size = dev->gso_max_size;
1177 netdev_update_features(vlan->dev);
1178 }
1179 break;
1180 case NETDEV_CHANGEMTU:
1181 list_for_each_entry(vlan, &port->vlans, list) {
1182 if (vlan->dev->mtu <= dev->mtu)
1183 continue;
1184 dev_set_mtu(vlan->dev, dev->mtu);
1185 }
1186 break;
1187 case NETDEV_CHANGEADDR:
1188 if (!port->passthru)
1189 return NOTIFY_DONE;
1190
1191 vlan = list_first_entry_or_null(&port->vlans,
1192 struct macvlan_dev,
1193 list);
1194
1195 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1196 return NOTIFY_BAD;
1197
1198 break;
1199 case NETDEV_UNREGISTER:
1200 /* twiddle thumbs on netns device moves */
1201 if (dev->reg_state != NETREG_UNREGISTERING)
1202 break;
1203
1204 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1205 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1206 unregister_netdevice_many(&list_kill);
1207 list_del(&list_kill);
1208 break;
1209 case NETDEV_PRE_TYPE_CHANGE:
1210 /* Forbid underlaying device to change its type. */
1211 return NOTIFY_BAD;
1212 }
1213 return NOTIFY_DONE;
1214 }
1215
1216 static struct notifier_block macvlan_notifier_block __read_mostly = {
1217 .notifier_call = macvlan_device_event,
1218 };
1219
1220 static int __init macvlan_init_module(void)
1221 {
1222 int err;
1223
1224 register_netdevice_notifier(&macvlan_notifier_block);
1225
1226 err = macvlan_link_register(&macvlan_link_ops);
1227 if (err < 0)
1228 goto err1;
1229 return 0;
1230 err1:
1231 unregister_netdevice_notifier(&macvlan_notifier_block);
1232 return err;
1233 }
1234
1235 static void __exit macvlan_cleanup_module(void)
1236 {
1237 rtnl_link_unregister(&macvlan_link_ops);
1238 unregister_netdevice_notifier(&macvlan_notifier_block);
1239 }
1240
1241 module_init(macvlan_init_module);
1242 module_exit(macvlan_cleanup_module);
1243
1244 MODULE_LICENSE("GPL");
1245 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1246 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1247 MODULE_ALIAS_RTNL_LINK("macvlan");
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