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Merge remote-tracking branch 'regulator/fix/max77802' into regulator-linus
[mirror_ubuntu-artful-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_BITS 8
39 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
40 #define MACVLAN_BC_QUEUE_LEN 1000
41
42 #define MACVLAN_F_PASSTHRU 1
43 #define MACVLAN_F_ADDRCHANGE 2
44
45 struct macvlan_port {
46 struct net_device *dev;
47 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
48 struct list_head vlans;
49 struct sk_buff_head bc_queue;
50 struct work_struct bc_work;
51 u32 flags;
52 int count;
53 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
54 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
55 unsigned char perm_addr[ETH_ALEN];
56 };
57
58 struct macvlan_source_entry {
59 struct hlist_node hlist;
60 struct macvlan_dev *vlan;
61 unsigned char addr[6+2] __aligned(sizeof(u16));
62 struct rcu_head rcu;
63 };
64
65 struct macvlan_skb_cb {
66 const struct macvlan_dev *src;
67 };
68
69 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
70
71 static void macvlan_port_destroy(struct net_device *dev);
72
73 static inline bool macvlan_passthru(const struct macvlan_port *port)
74 {
75 return port->flags & MACVLAN_F_PASSTHRU;
76 }
77
78 static inline void macvlan_set_passthru(struct macvlan_port *port)
79 {
80 port->flags |= MACVLAN_F_PASSTHRU;
81 }
82
83 static inline bool macvlan_addr_change(const struct macvlan_port *port)
84 {
85 return port->flags & MACVLAN_F_ADDRCHANGE;
86 }
87
88 static inline void macvlan_set_addr_change(struct macvlan_port *port)
89 {
90 port->flags |= MACVLAN_F_ADDRCHANGE;
91 }
92
93 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
94 {
95 port->flags &= ~MACVLAN_F_ADDRCHANGE;
96 }
97
98 /* Hash Ethernet address */
99 static u32 macvlan_eth_hash(const unsigned char *addr)
100 {
101 u64 value = get_unaligned((u64 *)addr);
102
103 /* only want 6 bytes */
104 #ifdef __BIG_ENDIAN
105 value >>= 16;
106 #else
107 value <<= 16;
108 #endif
109 return hash_64(value, MACVLAN_HASH_BITS);
110 }
111
112 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
113 {
114 return rcu_dereference(dev->rx_handler_data);
115 }
116
117 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
118 {
119 return rtnl_dereference(dev->rx_handler_data);
120 }
121
122 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
123
124 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
125 const unsigned char *addr)
126 {
127 struct macvlan_dev *vlan;
128 u32 idx = macvlan_eth_hash(addr);
129
130 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
131 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
132 return vlan;
133 }
134 return NULL;
135 }
136
137 static struct macvlan_source_entry *macvlan_hash_lookup_source(
138 const struct macvlan_dev *vlan,
139 const unsigned char *addr)
140 {
141 struct macvlan_source_entry *entry;
142 u32 idx = macvlan_eth_hash(addr);
143 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
144
145 hlist_for_each_entry_rcu(entry, h, hlist) {
146 if (ether_addr_equal_64bits(entry->addr, addr) &&
147 entry->vlan == vlan)
148 return entry;
149 }
150 return NULL;
151 }
152
153 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
154 const unsigned char *addr)
155 {
156 struct macvlan_port *port = vlan->port;
157 struct macvlan_source_entry *entry;
158 struct hlist_head *h;
159
160 entry = macvlan_hash_lookup_source(vlan, addr);
161 if (entry)
162 return 0;
163
164 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
165 if (!entry)
166 return -ENOMEM;
167
168 ether_addr_copy(entry->addr, addr);
169 entry->vlan = vlan;
170 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
171 hlist_add_head_rcu(&entry->hlist, h);
172 vlan->macaddr_count++;
173
174 return 0;
175 }
176
177 static void macvlan_hash_add(struct macvlan_dev *vlan)
178 {
179 struct macvlan_port *port = vlan->port;
180 const unsigned char *addr = vlan->dev->dev_addr;
181 u32 idx = macvlan_eth_hash(addr);
182
183 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
184 }
185
186 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
187 {
188 hlist_del_rcu(&entry->hlist);
189 kfree_rcu(entry, rcu);
190 }
191
192 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
193 {
194 hlist_del_rcu(&vlan->hlist);
195 if (sync)
196 synchronize_rcu();
197 }
198
199 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
200 const unsigned char *addr)
201 {
202 macvlan_hash_del(vlan, true);
203 /* Now that we are unhashed it is safe to change the device
204 * address without confusing packet delivery.
205 */
206 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
207 macvlan_hash_add(vlan);
208 }
209
210 static bool macvlan_addr_busy(const struct macvlan_port *port,
211 const unsigned char *addr)
212 {
213 /* Test to see if the specified address is
214 * currently in use by the underlying device or
215 * another macvlan.
216 */
217 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
218 ether_addr_equal_64bits(port->dev->dev_addr, addr))
219 return true;
220
221 if (macvlan_hash_lookup(port, addr))
222 return true;
223
224 return false;
225 }
226
227
228 static int macvlan_broadcast_one(struct sk_buff *skb,
229 const struct macvlan_dev *vlan,
230 const struct ethhdr *eth, bool local)
231 {
232 struct net_device *dev = vlan->dev;
233
234 if (local)
235 return __dev_forward_skb(dev, skb);
236
237 skb->dev = dev;
238 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
239 skb->pkt_type = PACKET_BROADCAST;
240 else
241 skb->pkt_type = PACKET_MULTICAST;
242
243 return 0;
244 }
245
246 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
247 {
248 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
249 }
250
251
252 static unsigned int mc_hash(const struct macvlan_dev *vlan,
253 const unsigned char *addr)
254 {
255 u32 val = __get_unaligned_cpu32(addr + 2);
256
257 val ^= macvlan_hash_mix(vlan);
258 return hash_32(val, MACVLAN_MC_FILTER_BITS);
259 }
260
261 static void macvlan_broadcast(struct sk_buff *skb,
262 const struct macvlan_port *port,
263 struct net_device *src,
264 enum macvlan_mode mode)
265 {
266 const struct ethhdr *eth = eth_hdr(skb);
267 const struct macvlan_dev *vlan;
268 struct sk_buff *nskb;
269 unsigned int i;
270 int err;
271 unsigned int hash;
272
273 if (skb->protocol == htons(ETH_P_PAUSE))
274 return;
275
276 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
277 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
278 if (vlan->dev == src || !(vlan->mode & mode))
279 continue;
280
281 hash = mc_hash(vlan, eth->h_dest);
282 if (!test_bit(hash, vlan->mc_filter))
283 continue;
284
285 err = NET_RX_DROP;
286 nskb = skb_clone(skb, GFP_ATOMIC);
287 if (likely(nskb))
288 err = macvlan_broadcast_one(
289 nskb, vlan, eth,
290 mode == MACVLAN_MODE_BRIDGE) ?:
291 netif_rx_ni(nskb);
292 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
293 err == NET_RX_SUCCESS, true);
294 }
295 }
296 }
297
298 static void macvlan_process_broadcast(struct work_struct *w)
299 {
300 struct macvlan_port *port = container_of(w, struct macvlan_port,
301 bc_work);
302 struct sk_buff *skb;
303 struct sk_buff_head list;
304
305 __skb_queue_head_init(&list);
306
307 spin_lock_bh(&port->bc_queue.lock);
308 skb_queue_splice_tail_init(&port->bc_queue, &list);
309 spin_unlock_bh(&port->bc_queue.lock);
310
311 while ((skb = __skb_dequeue(&list))) {
312 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
313
314 rcu_read_lock();
315
316 if (!src)
317 /* frame comes from an external address */
318 macvlan_broadcast(skb, port, NULL,
319 MACVLAN_MODE_PRIVATE |
320 MACVLAN_MODE_VEPA |
321 MACVLAN_MODE_PASSTHRU|
322 MACVLAN_MODE_BRIDGE);
323 else if (src->mode == MACVLAN_MODE_VEPA)
324 /* flood to everyone except source */
325 macvlan_broadcast(skb, port, src->dev,
326 MACVLAN_MODE_VEPA |
327 MACVLAN_MODE_BRIDGE);
328 else
329 /*
330 * flood only to VEPA ports, bridge ports
331 * already saw the frame on the way out.
332 */
333 macvlan_broadcast(skb, port, src->dev,
334 MACVLAN_MODE_VEPA);
335
336 rcu_read_unlock();
337
338 if (src)
339 dev_put(src->dev);
340 kfree_skb(skb);
341 }
342 }
343
344 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
345 const struct macvlan_dev *src,
346 struct sk_buff *skb)
347 {
348 struct sk_buff *nskb;
349 int err = -ENOMEM;
350
351 nskb = skb_clone(skb, GFP_ATOMIC);
352 if (!nskb)
353 goto err;
354
355 MACVLAN_SKB_CB(nskb)->src = src;
356
357 spin_lock(&port->bc_queue.lock);
358 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
359 if (src)
360 dev_hold(src->dev);
361 __skb_queue_tail(&port->bc_queue, nskb);
362 err = 0;
363 }
364 spin_unlock(&port->bc_queue.lock);
365
366 if (err)
367 goto free_nskb;
368
369 schedule_work(&port->bc_work);
370 return;
371
372 free_nskb:
373 kfree_skb(nskb);
374 err:
375 atomic_long_inc(&skb->dev->rx_dropped);
376 }
377
378 static void macvlan_flush_sources(struct macvlan_port *port,
379 struct macvlan_dev *vlan)
380 {
381 int i;
382
383 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
384 struct hlist_node *h, *n;
385
386 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
387 struct macvlan_source_entry *entry;
388
389 entry = hlist_entry(h, struct macvlan_source_entry,
390 hlist);
391 if (entry->vlan == vlan)
392 macvlan_hash_del_source(entry);
393 }
394 }
395 vlan->macaddr_count = 0;
396 }
397
398 static void macvlan_forward_source_one(struct sk_buff *skb,
399 struct macvlan_dev *vlan)
400 {
401 struct sk_buff *nskb;
402 struct net_device *dev;
403 int len;
404 int ret;
405
406 dev = vlan->dev;
407 if (unlikely(!(dev->flags & IFF_UP)))
408 return;
409
410 nskb = skb_clone(skb, GFP_ATOMIC);
411 if (!nskb)
412 return;
413
414 len = nskb->len + ETH_HLEN;
415 nskb->dev = dev;
416 nskb->pkt_type = PACKET_HOST;
417
418 ret = netif_rx(nskb);
419 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
420 }
421
422 static void macvlan_forward_source(struct sk_buff *skb,
423 struct macvlan_port *port,
424 const unsigned char *addr)
425 {
426 struct macvlan_source_entry *entry;
427 u32 idx = macvlan_eth_hash(addr);
428 struct hlist_head *h = &port->vlan_source_hash[idx];
429
430 hlist_for_each_entry_rcu(entry, h, hlist) {
431 if (ether_addr_equal_64bits(entry->addr, addr))
432 macvlan_forward_source_one(skb, entry->vlan);
433 }
434 }
435
436 /* called under rcu_read_lock() from netif_receive_skb */
437 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
438 {
439 struct macvlan_port *port;
440 struct sk_buff *skb = *pskb;
441 const struct ethhdr *eth = eth_hdr(skb);
442 const struct macvlan_dev *vlan;
443 const struct macvlan_dev *src;
444 struct net_device *dev;
445 unsigned int len = 0;
446 int ret;
447 rx_handler_result_t handle_res;
448
449 port = macvlan_port_get_rcu(skb->dev);
450 if (is_multicast_ether_addr(eth->h_dest)) {
451 unsigned int hash;
452
453 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
454 if (!skb)
455 return RX_HANDLER_CONSUMED;
456 *pskb = skb;
457 eth = eth_hdr(skb);
458 macvlan_forward_source(skb, port, eth->h_source);
459 src = macvlan_hash_lookup(port, eth->h_source);
460 if (src && src->mode != MACVLAN_MODE_VEPA &&
461 src->mode != MACVLAN_MODE_BRIDGE) {
462 /* forward to original port. */
463 vlan = src;
464 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
465 netif_rx(skb);
466 handle_res = RX_HANDLER_CONSUMED;
467 goto out;
468 }
469
470 hash = mc_hash(NULL, eth->h_dest);
471 if (test_bit(hash, port->mc_filter))
472 macvlan_broadcast_enqueue(port, src, skb);
473
474 return RX_HANDLER_PASS;
475 }
476
477 macvlan_forward_source(skb, port, eth->h_source);
478 if (macvlan_passthru(port))
479 vlan = list_first_or_null_rcu(&port->vlans,
480 struct macvlan_dev, list);
481 else
482 vlan = macvlan_hash_lookup(port, eth->h_dest);
483 if (vlan == NULL)
484 return RX_HANDLER_PASS;
485
486 dev = vlan->dev;
487 if (unlikely(!(dev->flags & IFF_UP))) {
488 kfree_skb(skb);
489 return RX_HANDLER_CONSUMED;
490 }
491 len = skb->len + ETH_HLEN;
492 skb = skb_share_check(skb, GFP_ATOMIC);
493 if (!skb) {
494 ret = NET_RX_DROP;
495 handle_res = RX_HANDLER_CONSUMED;
496 goto out;
497 }
498
499 *pskb = skb;
500 skb->dev = dev;
501 skb->pkt_type = PACKET_HOST;
502
503 ret = NET_RX_SUCCESS;
504 handle_res = RX_HANDLER_ANOTHER;
505 out:
506 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
507 return handle_res;
508 }
509
510 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
511 {
512 const struct macvlan_dev *vlan = netdev_priv(dev);
513 const struct macvlan_port *port = vlan->port;
514 const struct macvlan_dev *dest;
515
516 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
517 const struct ethhdr *eth = (void *)skb->data;
518
519 /* send to other bridge ports directly */
520 if (is_multicast_ether_addr(eth->h_dest)) {
521 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
522 goto xmit_world;
523 }
524
525 dest = macvlan_hash_lookup(port, eth->h_dest);
526 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
527 /* send to lowerdev first for its network taps */
528 dev_forward_skb(vlan->lowerdev, skb);
529
530 return NET_XMIT_SUCCESS;
531 }
532 }
533
534 xmit_world:
535 skb->dev = vlan->lowerdev;
536 return dev_queue_xmit(skb);
537 }
538
539 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
540 {
541 #ifdef CONFIG_NET_POLL_CONTROLLER
542 if (vlan->netpoll)
543 netpoll_send_skb(vlan->netpoll, skb);
544 #else
545 BUG();
546 #endif
547 return NETDEV_TX_OK;
548 }
549
550 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
551 struct net_device *dev)
552 {
553 unsigned int len = skb->len;
554 int ret;
555 struct macvlan_dev *vlan = netdev_priv(dev);
556
557 if (unlikely(netpoll_tx_running(dev)))
558 return macvlan_netpoll_send_skb(vlan, skb);
559
560 if (vlan->fwd_priv) {
561 skb->dev = vlan->lowerdev;
562 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
563 } else {
564 ret = macvlan_queue_xmit(skb, dev);
565 }
566
567 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
568 struct vlan_pcpu_stats *pcpu_stats;
569
570 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
571 u64_stats_update_begin(&pcpu_stats->syncp);
572 pcpu_stats->tx_packets++;
573 pcpu_stats->tx_bytes += len;
574 u64_stats_update_end(&pcpu_stats->syncp);
575 } else {
576 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
577 }
578 return ret;
579 }
580
581 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
582 unsigned short type, const void *daddr,
583 const void *saddr, unsigned len)
584 {
585 const struct macvlan_dev *vlan = netdev_priv(dev);
586 struct net_device *lowerdev = vlan->lowerdev;
587
588 return dev_hard_header(skb, lowerdev, type, daddr,
589 saddr ? : dev->dev_addr, len);
590 }
591
592 static const struct header_ops macvlan_hard_header_ops = {
593 .create = macvlan_hard_header,
594 .parse = eth_header_parse,
595 .cache = eth_header_cache,
596 .cache_update = eth_header_cache_update,
597 };
598
599 static struct rtnl_link_ops macvlan_link_ops;
600
601 static int macvlan_open(struct net_device *dev)
602 {
603 struct macvlan_dev *vlan = netdev_priv(dev);
604 struct net_device *lowerdev = vlan->lowerdev;
605 int err;
606
607 if (macvlan_passthru(vlan->port)) {
608 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
609 err = dev_set_promiscuity(lowerdev, 1);
610 if (err < 0)
611 goto out;
612 }
613 goto hash_add;
614 }
615
616 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
617 dev->rtnl_link_ops == &macvlan_link_ops) {
618 vlan->fwd_priv =
619 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
620
621 /* If we get a NULL pointer back, or if we get an error
622 * then we should just fall through to the non accelerated path
623 */
624 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
625 vlan->fwd_priv = NULL;
626 } else
627 return 0;
628 }
629
630 err = -EBUSY;
631 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
632 goto out;
633
634 err = dev_uc_add(lowerdev, dev->dev_addr);
635 if (err < 0)
636 goto out;
637 if (dev->flags & IFF_ALLMULTI) {
638 err = dev_set_allmulti(lowerdev, 1);
639 if (err < 0)
640 goto del_unicast;
641 }
642
643 if (dev->flags & IFF_PROMISC) {
644 err = dev_set_promiscuity(lowerdev, 1);
645 if (err < 0)
646 goto clear_multi;
647 }
648
649 hash_add:
650 macvlan_hash_add(vlan);
651 return 0;
652
653 clear_multi:
654 if (dev->flags & IFF_ALLMULTI)
655 dev_set_allmulti(lowerdev, -1);
656 del_unicast:
657 dev_uc_del(lowerdev, dev->dev_addr);
658 out:
659 if (vlan->fwd_priv) {
660 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
661 vlan->fwd_priv);
662 vlan->fwd_priv = NULL;
663 }
664 return err;
665 }
666
667 static int macvlan_stop(struct net_device *dev)
668 {
669 struct macvlan_dev *vlan = netdev_priv(dev);
670 struct net_device *lowerdev = vlan->lowerdev;
671
672 if (vlan->fwd_priv) {
673 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
674 vlan->fwd_priv);
675 vlan->fwd_priv = NULL;
676 return 0;
677 }
678
679 dev_uc_unsync(lowerdev, dev);
680 dev_mc_unsync(lowerdev, dev);
681
682 if (macvlan_passthru(vlan->port)) {
683 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
684 dev_set_promiscuity(lowerdev, -1);
685 goto hash_del;
686 }
687
688 if (dev->flags & IFF_ALLMULTI)
689 dev_set_allmulti(lowerdev, -1);
690
691 if (dev->flags & IFF_PROMISC)
692 dev_set_promiscuity(lowerdev, -1);
693
694 dev_uc_del(lowerdev, dev->dev_addr);
695
696 hash_del:
697 macvlan_hash_del(vlan, !dev->dismantle);
698 return 0;
699 }
700
701 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
702 {
703 struct macvlan_dev *vlan = netdev_priv(dev);
704 struct net_device *lowerdev = vlan->lowerdev;
705 struct macvlan_port *port = vlan->port;
706 int err;
707
708 if (!(dev->flags & IFF_UP)) {
709 /* Just copy in the new address */
710 ether_addr_copy(dev->dev_addr, addr);
711 } else {
712 /* Rehash and update the device filters */
713 if (macvlan_addr_busy(vlan->port, addr))
714 return -EBUSY;
715
716 if (!macvlan_passthru(port)) {
717 err = dev_uc_add(lowerdev, addr);
718 if (err)
719 return err;
720
721 dev_uc_del(lowerdev, dev->dev_addr);
722 }
723
724 macvlan_hash_change_addr(vlan, addr);
725 }
726 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
727 /* Since addr_change isn't set, we are here due to lower
728 * device change. Save the lower-dev address so we can
729 * restore it later.
730 */
731 ether_addr_copy(vlan->port->perm_addr,
732 lowerdev->dev_addr);
733 }
734 macvlan_clear_addr_change(port);
735 return 0;
736 }
737
738 static int macvlan_set_mac_address(struct net_device *dev, void *p)
739 {
740 struct macvlan_dev *vlan = netdev_priv(dev);
741 struct sockaddr *addr = p;
742
743 if (!is_valid_ether_addr(addr->sa_data))
744 return -EADDRNOTAVAIL;
745
746 /* If the addresses are the same, this is a no-op */
747 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
748 return 0;
749
750 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
751 macvlan_set_addr_change(vlan->port);
752 dev_set_mac_address(vlan->lowerdev, addr);
753 return 0;
754 }
755
756 return macvlan_sync_address(dev, addr->sa_data);
757 }
758
759 static void macvlan_change_rx_flags(struct net_device *dev, int change)
760 {
761 struct macvlan_dev *vlan = netdev_priv(dev);
762 struct net_device *lowerdev = vlan->lowerdev;
763
764 if (dev->flags & IFF_UP) {
765 if (change & IFF_ALLMULTI)
766 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
767 if (change & IFF_PROMISC)
768 dev_set_promiscuity(lowerdev,
769 dev->flags & IFF_PROMISC ? 1 : -1);
770
771 }
772 }
773
774 static void macvlan_compute_filter(unsigned long *mc_filter,
775 struct net_device *dev,
776 struct macvlan_dev *vlan)
777 {
778 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
779 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
780 } else {
781 struct netdev_hw_addr *ha;
782 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
783
784 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
785 netdev_for_each_mc_addr(ha, dev) {
786 __set_bit(mc_hash(vlan, ha->addr), filter);
787 }
788
789 __set_bit(mc_hash(vlan, dev->broadcast), filter);
790
791 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
792 }
793 }
794
795 static void macvlan_set_mac_lists(struct net_device *dev)
796 {
797 struct macvlan_dev *vlan = netdev_priv(dev);
798
799 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
800
801 dev_uc_sync(vlan->lowerdev, dev);
802 dev_mc_sync(vlan->lowerdev, dev);
803
804 /* This is slightly inaccurate as we're including the subscription
805 * list of vlan->lowerdev too.
806 *
807 * Bug alert: This only works if everyone has the same broadcast
808 * address as lowerdev. As soon as someone changes theirs this
809 * will break.
810 *
811 * However, this is already broken as when you change your broadcast
812 * address we don't get called.
813 *
814 * The solution is to maintain a list of broadcast addresses like
815 * we do for uc/mc, if you care.
816 */
817 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
818 }
819
820 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
821 {
822 struct macvlan_dev *vlan = netdev_priv(dev);
823
824 if (vlan->lowerdev->mtu < new_mtu)
825 return -EINVAL;
826 dev->mtu = new_mtu;
827 return 0;
828 }
829
830 /*
831 * macvlan network devices have devices nesting below it and are a special
832 * "super class" of normal network devices; split their locks off into a
833 * separate class since they always nest.
834 */
835 static struct lock_class_key macvlan_netdev_addr_lock_key;
836
837 #define ALWAYS_ON_OFFLOADS \
838 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
839 NETIF_F_GSO_ROBUST)
840
841 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
842
843 #define MACVLAN_FEATURES \
844 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
845 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
846 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
847 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
848
849 #define MACVLAN_STATE_MASK \
850 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
851
852 static int macvlan_get_nest_level(struct net_device *dev)
853 {
854 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
855 }
856
857 static void macvlan_set_lockdep_class(struct net_device *dev)
858 {
859 netdev_lockdep_set_classes(dev);
860 lockdep_set_class_and_subclass(&dev->addr_list_lock,
861 &macvlan_netdev_addr_lock_key,
862 macvlan_get_nest_level(dev));
863 }
864
865 static int macvlan_init(struct net_device *dev)
866 {
867 struct macvlan_dev *vlan = netdev_priv(dev);
868 const struct net_device *lowerdev = vlan->lowerdev;
869 struct macvlan_port *port = vlan->port;
870
871 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
872 (lowerdev->state & MACVLAN_STATE_MASK);
873 dev->features = lowerdev->features & MACVLAN_FEATURES;
874 dev->features |= ALWAYS_ON_FEATURES;
875 dev->hw_features |= NETIF_F_LRO;
876 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
877 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
878 dev->gso_max_size = lowerdev->gso_max_size;
879 dev->gso_max_segs = lowerdev->gso_max_segs;
880 dev->hard_header_len = lowerdev->hard_header_len;
881
882 macvlan_set_lockdep_class(dev);
883
884 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
885 if (!vlan->pcpu_stats)
886 return -ENOMEM;
887
888 port->count += 1;
889
890 return 0;
891 }
892
893 static void macvlan_uninit(struct net_device *dev)
894 {
895 struct macvlan_dev *vlan = netdev_priv(dev);
896 struct macvlan_port *port = vlan->port;
897
898 free_percpu(vlan->pcpu_stats);
899
900 macvlan_flush_sources(port, vlan);
901 port->count -= 1;
902 if (!port->count)
903 macvlan_port_destroy(port->dev);
904 }
905
906 static void macvlan_dev_get_stats64(struct net_device *dev,
907 struct rtnl_link_stats64 *stats)
908 {
909 struct macvlan_dev *vlan = netdev_priv(dev);
910
911 if (vlan->pcpu_stats) {
912 struct vlan_pcpu_stats *p;
913 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
914 u32 rx_errors = 0, tx_dropped = 0;
915 unsigned int start;
916 int i;
917
918 for_each_possible_cpu(i) {
919 p = per_cpu_ptr(vlan->pcpu_stats, i);
920 do {
921 start = u64_stats_fetch_begin_irq(&p->syncp);
922 rx_packets = p->rx_packets;
923 rx_bytes = p->rx_bytes;
924 rx_multicast = p->rx_multicast;
925 tx_packets = p->tx_packets;
926 tx_bytes = p->tx_bytes;
927 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
928
929 stats->rx_packets += rx_packets;
930 stats->rx_bytes += rx_bytes;
931 stats->multicast += rx_multicast;
932 stats->tx_packets += tx_packets;
933 stats->tx_bytes += tx_bytes;
934 /* rx_errors & tx_dropped are u32, updated
935 * without syncp protection.
936 */
937 rx_errors += p->rx_errors;
938 tx_dropped += p->tx_dropped;
939 }
940 stats->rx_errors = rx_errors;
941 stats->rx_dropped = rx_errors;
942 stats->tx_dropped = tx_dropped;
943 }
944 }
945
946 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
947 __be16 proto, u16 vid)
948 {
949 struct macvlan_dev *vlan = netdev_priv(dev);
950 struct net_device *lowerdev = vlan->lowerdev;
951
952 return vlan_vid_add(lowerdev, proto, vid);
953 }
954
955 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
956 __be16 proto, u16 vid)
957 {
958 struct macvlan_dev *vlan = netdev_priv(dev);
959 struct net_device *lowerdev = vlan->lowerdev;
960
961 vlan_vid_del(lowerdev, proto, vid);
962 return 0;
963 }
964
965 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
966 struct net_device *dev,
967 const unsigned char *addr, u16 vid,
968 u16 flags)
969 {
970 struct macvlan_dev *vlan = netdev_priv(dev);
971 int err = -EINVAL;
972
973 /* Support unicast filter only on passthru devices.
974 * Multicast filter should be allowed on all devices.
975 */
976 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
977 return -EOPNOTSUPP;
978
979 if (flags & NLM_F_REPLACE)
980 return -EOPNOTSUPP;
981
982 if (is_unicast_ether_addr(addr))
983 err = dev_uc_add_excl(dev, addr);
984 else if (is_multicast_ether_addr(addr))
985 err = dev_mc_add_excl(dev, addr);
986
987 return err;
988 }
989
990 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
991 struct net_device *dev,
992 const unsigned char *addr, u16 vid)
993 {
994 struct macvlan_dev *vlan = netdev_priv(dev);
995 int err = -EINVAL;
996
997 /* Support unicast filter only on passthru devices.
998 * Multicast filter should be allowed on all devices.
999 */
1000 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1001 return -EOPNOTSUPP;
1002
1003 if (is_unicast_ether_addr(addr))
1004 err = dev_uc_del(dev, addr);
1005 else if (is_multicast_ether_addr(addr))
1006 err = dev_mc_del(dev, addr);
1007
1008 return err;
1009 }
1010
1011 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1012 struct ethtool_drvinfo *drvinfo)
1013 {
1014 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1015 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1016 }
1017
1018 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1019 struct ethtool_link_ksettings *cmd)
1020 {
1021 const struct macvlan_dev *vlan = netdev_priv(dev);
1022
1023 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1024 }
1025
1026 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1027 netdev_features_t features)
1028 {
1029 struct macvlan_dev *vlan = netdev_priv(dev);
1030 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1031 netdev_features_t mask;
1032
1033 features |= NETIF_F_ALL_FOR_ALL;
1034 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1035 mask = features;
1036
1037 lowerdev_features &= (features | ~NETIF_F_LRO);
1038 features = netdev_increment_features(lowerdev_features, features, mask);
1039 features |= ALWAYS_ON_FEATURES;
1040 features &= ~NETIF_F_NETNS_LOCAL;
1041
1042 return features;
1043 }
1044
1045 #ifdef CONFIG_NET_POLL_CONTROLLER
1046 static void macvlan_dev_poll_controller(struct net_device *dev)
1047 {
1048 return;
1049 }
1050
1051 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1052 {
1053 struct macvlan_dev *vlan = netdev_priv(dev);
1054 struct net_device *real_dev = vlan->lowerdev;
1055 struct netpoll *netpoll;
1056 int err = 0;
1057
1058 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1059 err = -ENOMEM;
1060 if (!netpoll)
1061 goto out;
1062
1063 err = __netpoll_setup(netpoll, real_dev);
1064 if (err) {
1065 kfree(netpoll);
1066 goto out;
1067 }
1068
1069 vlan->netpoll = netpoll;
1070
1071 out:
1072 return err;
1073 }
1074
1075 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1076 {
1077 struct macvlan_dev *vlan = netdev_priv(dev);
1078 struct netpoll *netpoll = vlan->netpoll;
1079
1080 if (!netpoll)
1081 return;
1082
1083 vlan->netpoll = NULL;
1084
1085 __netpoll_free_async(netpoll);
1086 }
1087 #endif /* CONFIG_NET_POLL_CONTROLLER */
1088
1089 static int macvlan_dev_get_iflink(const struct net_device *dev)
1090 {
1091 struct macvlan_dev *vlan = netdev_priv(dev);
1092
1093 return vlan->lowerdev->ifindex;
1094 }
1095
1096 static const struct ethtool_ops macvlan_ethtool_ops = {
1097 .get_link = ethtool_op_get_link,
1098 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1099 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1100 };
1101
1102 static const struct net_device_ops macvlan_netdev_ops = {
1103 .ndo_init = macvlan_init,
1104 .ndo_uninit = macvlan_uninit,
1105 .ndo_open = macvlan_open,
1106 .ndo_stop = macvlan_stop,
1107 .ndo_start_xmit = macvlan_start_xmit,
1108 .ndo_change_mtu = macvlan_change_mtu,
1109 .ndo_fix_features = macvlan_fix_features,
1110 .ndo_change_rx_flags = macvlan_change_rx_flags,
1111 .ndo_set_mac_address = macvlan_set_mac_address,
1112 .ndo_set_rx_mode = macvlan_set_mac_lists,
1113 .ndo_get_stats64 = macvlan_dev_get_stats64,
1114 .ndo_validate_addr = eth_validate_addr,
1115 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1116 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1117 .ndo_fdb_add = macvlan_fdb_add,
1118 .ndo_fdb_del = macvlan_fdb_del,
1119 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1120 .ndo_get_lock_subclass = macvlan_get_nest_level,
1121 #ifdef CONFIG_NET_POLL_CONTROLLER
1122 .ndo_poll_controller = macvlan_dev_poll_controller,
1123 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1124 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1125 #endif
1126 .ndo_get_iflink = macvlan_dev_get_iflink,
1127 .ndo_features_check = passthru_features_check,
1128 };
1129
1130 void macvlan_common_setup(struct net_device *dev)
1131 {
1132 ether_setup(dev);
1133
1134 dev->min_mtu = 0;
1135 dev->max_mtu = ETH_MAX_MTU;
1136 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1137 netif_keep_dst(dev);
1138 dev->priv_flags |= IFF_UNICAST_FLT;
1139 dev->netdev_ops = &macvlan_netdev_ops;
1140 dev->needs_free_netdev = true;
1141 dev->header_ops = &macvlan_hard_header_ops;
1142 dev->ethtool_ops = &macvlan_ethtool_ops;
1143 }
1144 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1145
1146 static void macvlan_setup(struct net_device *dev)
1147 {
1148 macvlan_common_setup(dev);
1149 dev->priv_flags |= IFF_NO_QUEUE;
1150 }
1151
1152 static int macvlan_port_create(struct net_device *dev)
1153 {
1154 struct macvlan_port *port;
1155 unsigned int i;
1156 int err;
1157
1158 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1159 return -EINVAL;
1160
1161 if (netdev_is_rx_handler_busy(dev))
1162 return -EBUSY;
1163
1164 port = kzalloc(sizeof(*port), GFP_KERNEL);
1165 if (port == NULL)
1166 return -ENOMEM;
1167
1168 port->dev = dev;
1169 ether_addr_copy(port->perm_addr, dev->dev_addr);
1170 INIT_LIST_HEAD(&port->vlans);
1171 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1172 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1173 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1174 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1175
1176 skb_queue_head_init(&port->bc_queue);
1177 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1178
1179 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1180 if (err)
1181 kfree(port);
1182 else
1183 dev->priv_flags |= IFF_MACVLAN_PORT;
1184 return err;
1185 }
1186
1187 static void macvlan_port_destroy(struct net_device *dev)
1188 {
1189 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1190 struct sk_buff *skb;
1191
1192 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1193 netdev_rx_handler_unregister(dev);
1194
1195 /* After this point, no packet can schedule bc_work anymore,
1196 * but we need to cancel it and purge left skbs if any.
1197 */
1198 cancel_work_sync(&port->bc_work);
1199
1200 while ((skb = __skb_dequeue(&port->bc_queue))) {
1201 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1202
1203 if (src)
1204 dev_put(src->dev);
1205
1206 kfree_skb(skb);
1207 }
1208
1209 /* If the lower device address has been changed by passthru
1210 * macvlan, put it back.
1211 */
1212 if (macvlan_passthru(port) &&
1213 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1214 struct sockaddr sa;
1215
1216 sa.sa_family = port->dev->type;
1217 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1218 dev_set_mac_address(port->dev, &sa);
1219 }
1220
1221 kfree(port);
1222 }
1223
1224 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1225 {
1226 if (tb[IFLA_ADDRESS]) {
1227 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1228 return -EINVAL;
1229 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1230 return -EADDRNOTAVAIL;
1231 }
1232
1233 if (data && data[IFLA_MACVLAN_FLAGS] &&
1234 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1235 return -EINVAL;
1236
1237 if (data && data[IFLA_MACVLAN_MODE]) {
1238 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1239 case MACVLAN_MODE_PRIVATE:
1240 case MACVLAN_MODE_VEPA:
1241 case MACVLAN_MODE_BRIDGE:
1242 case MACVLAN_MODE_PASSTHRU:
1243 case MACVLAN_MODE_SOURCE:
1244 break;
1245 default:
1246 return -EINVAL;
1247 }
1248 }
1249
1250 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1251 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1252 case MACVLAN_MACADDR_ADD:
1253 case MACVLAN_MACADDR_DEL:
1254 case MACVLAN_MACADDR_FLUSH:
1255 case MACVLAN_MACADDR_SET:
1256 break;
1257 default:
1258 return -EINVAL;
1259 }
1260 }
1261
1262 if (data && data[IFLA_MACVLAN_MACADDR]) {
1263 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1264 return -EINVAL;
1265
1266 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1267 return -EADDRNOTAVAIL;
1268 }
1269
1270 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1271 return -EINVAL;
1272
1273 return 0;
1274 }
1275
1276 /**
1277 * reconfigure list of remote source mac address
1278 * (only for macvlan devices in source mode)
1279 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1280 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1281 */
1282 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1283 struct nlattr *data[])
1284 {
1285 char *addr = NULL;
1286 int ret, rem, len;
1287 struct nlattr *nla, *head;
1288 struct macvlan_source_entry *entry;
1289
1290 if (data[IFLA_MACVLAN_MACADDR])
1291 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1292
1293 if (mode == MACVLAN_MACADDR_ADD) {
1294 if (!addr)
1295 return -EINVAL;
1296
1297 return macvlan_hash_add_source(vlan, addr);
1298
1299 } else if (mode == MACVLAN_MACADDR_DEL) {
1300 if (!addr)
1301 return -EINVAL;
1302
1303 entry = macvlan_hash_lookup_source(vlan, addr);
1304 if (entry) {
1305 macvlan_hash_del_source(entry);
1306 vlan->macaddr_count--;
1307 }
1308 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1309 macvlan_flush_sources(vlan->port, vlan);
1310 } else if (mode == MACVLAN_MACADDR_SET) {
1311 macvlan_flush_sources(vlan->port, vlan);
1312
1313 if (addr) {
1314 ret = macvlan_hash_add_source(vlan, addr);
1315 if (ret)
1316 return ret;
1317 }
1318
1319 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1320 return 0;
1321
1322 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1323 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1324
1325 nla_for_each_attr(nla, head, len, rem) {
1326 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1327 nla_len(nla) != ETH_ALEN)
1328 continue;
1329
1330 addr = nla_data(nla);
1331 ret = macvlan_hash_add_source(vlan, addr);
1332 if (ret)
1333 return ret;
1334 }
1335 } else {
1336 return -EINVAL;
1337 }
1338
1339 return 0;
1340 }
1341
1342 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1343 struct nlattr *tb[], struct nlattr *data[])
1344 {
1345 struct macvlan_dev *vlan = netdev_priv(dev);
1346 struct macvlan_port *port;
1347 struct net_device *lowerdev;
1348 int err;
1349 int macmode;
1350 bool create = false;
1351
1352 if (!tb[IFLA_LINK])
1353 return -EINVAL;
1354
1355 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1356 if (lowerdev == NULL)
1357 return -ENODEV;
1358
1359 /* When creating macvlans or macvtaps on top of other macvlans - use
1360 * the real device as the lowerdev.
1361 */
1362 if (netif_is_macvlan(lowerdev))
1363 lowerdev = macvlan_dev_real_dev(lowerdev);
1364
1365 if (!tb[IFLA_MTU])
1366 dev->mtu = lowerdev->mtu;
1367 else if (dev->mtu > lowerdev->mtu)
1368 return -EINVAL;
1369
1370 /* MTU range: 68 - lowerdev->max_mtu */
1371 dev->min_mtu = ETH_MIN_MTU;
1372 dev->max_mtu = lowerdev->max_mtu;
1373
1374 if (!tb[IFLA_ADDRESS])
1375 eth_hw_addr_random(dev);
1376
1377 if (!macvlan_port_exists(lowerdev)) {
1378 err = macvlan_port_create(lowerdev);
1379 if (err < 0)
1380 return err;
1381 create = true;
1382 }
1383 port = macvlan_port_get_rtnl(lowerdev);
1384
1385 /* Only 1 macvlan device can be created in passthru mode */
1386 if (macvlan_passthru(port)) {
1387 /* The macvlan port must be not created this time,
1388 * still goto destroy_macvlan_port for readability.
1389 */
1390 err = -EINVAL;
1391 goto destroy_macvlan_port;
1392 }
1393
1394 vlan->lowerdev = lowerdev;
1395 vlan->dev = dev;
1396 vlan->port = port;
1397 vlan->set_features = MACVLAN_FEATURES;
1398 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1399
1400 vlan->mode = MACVLAN_MODE_VEPA;
1401 if (data && data[IFLA_MACVLAN_MODE])
1402 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1403
1404 if (data && data[IFLA_MACVLAN_FLAGS])
1405 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1406
1407 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1408 if (port->count) {
1409 err = -EINVAL;
1410 goto destroy_macvlan_port;
1411 }
1412 macvlan_set_passthru(port);
1413 eth_hw_addr_inherit(dev, lowerdev);
1414 }
1415
1416 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1417 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1418 err = -EINVAL;
1419 goto destroy_macvlan_port;
1420 }
1421 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1422 err = macvlan_changelink_sources(vlan, macmode, data);
1423 if (err)
1424 goto destroy_macvlan_port;
1425 }
1426
1427 err = register_netdevice(dev);
1428 if (err < 0)
1429 goto destroy_macvlan_port;
1430
1431 dev->priv_flags |= IFF_MACVLAN;
1432 err = netdev_upper_dev_link(lowerdev, dev);
1433 if (err)
1434 goto unregister_netdev;
1435
1436 list_add_tail_rcu(&vlan->list, &port->vlans);
1437 netif_stacked_transfer_operstate(lowerdev, dev);
1438 linkwatch_fire_event(dev);
1439
1440 return 0;
1441
1442 unregister_netdev:
1443 unregister_netdevice(dev);
1444 destroy_macvlan_port:
1445 if (create)
1446 macvlan_port_destroy(port->dev);
1447 return err;
1448 }
1449 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1450
1451 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1452 struct nlattr *tb[], struct nlattr *data[])
1453 {
1454 return macvlan_common_newlink(src_net, dev, tb, data);
1455 }
1456
1457 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1458 {
1459 struct macvlan_dev *vlan = netdev_priv(dev);
1460
1461 if (vlan->mode == MACVLAN_MODE_SOURCE)
1462 macvlan_flush_sources(vlan->port, vlan);
1463 list_del_rcu(&vlan->list);
1464 unregister_netdevice_queue(dev, head);
1465 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1466 }
1467 EXPORT_SYMBOL_GPL(macvlan_dellink);
1468
1469 static int macvlan_changelink(struct net_device *dev,
1470 struct nlattr *tb[], struct nlattr *data[])
1471 {
1472 struct macvlan_dev *vlan = netdev_priv(dev);
1473 enum macvlan_mode mode;
1474 bool set_mode = false;
1475 enum macvlan_macaddr_mode macmode;
1476 int ret;
1477
1478 /* Validate mode, but don't set yet: setting flags may fail. */
1479 if (data && data[IFLA_MACVLAN_MODE]) {
1480 set_mode = true;
1481 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1482 /* Passthrough mode can't be set or cleared dynamically */
1483 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1484 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1485 return -EINVAL;
1486 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1487 vlan->mode != mode)
1488 macvlan_flush_sources(vlan->port, vlan);
1489 }
1490
1491 if (data && data[IFLA_MACVLAN_FLAGS]) {
1492 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1493 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1494 if (macvlan_passthru(vlan->port) && promisc) {
1495 int err;
1496
1497 if (flags & MACVLAN_FLAG_NOPROMISC)
1498 err = dev_set_promiscuity(vlan->lowerdev, -1);
1499 else
1500 err = dev_set_promiscuity(vlan->lowerdev, 1);
1501 if (err < 0)
1502 return err;
1503 }
1504 vlan->flags = flags;
1505 }
1506 if (set_mode)
1507 vlan->mode = mode;
1508 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1509 if (vlan->mode != MACVLAN_MODE_SOURCE)
1510 return -EINVAL;
1511 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1512 ret = macvlan_changelink_sources(vlan, macmode, data);
1513 if (ret)
1514 return ret;
1515 }
1516 return 0;
1517 }
1518
1519 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1520 {
1521 if (vlan->macaddr_count == 0)
1522 return 0;
1523 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1524 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1525 }
1526
1527 static size_t macvlan_get_size(const struct net_device *dev)
1528 {
1529 struct macvlan_dev *vlan = netdev_priv(dev);
1530
1531 return (0
1532 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1533 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1534 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1535 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1536 );
1537 }
1538
1539 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1540 const struct macvlan_dev *vlan,
1541 const int i)
1542 {
1543 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1544 struct macvlan_source_entry *entry;
1545
1546 hlist_for_each_entry_rcu(entry, h, hlist) {
1547 if (entry->vlan != vlan)
1548 continue;
1549 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1550 return 1;
1551 }
1552 return 0;
1553 }
1554
1555 static int macvlan_fill_info(struct sk_buff *skb,
1556 const struct net_device *dev)
1557 {
1558 struct macvlan_dev *vlan = netdev_priv(dev);
1559 int i;
1560 struct nlattr *nest;
1561
1562 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1563 goto nla_put_failure;
1564 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1565 goto nla_put_failure;
1566 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1567 goto nla_put_failure;
1568 if (vlan->macaddr_count > 0) {
1569 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1570 if (nest == NULL)
1571 goto nla_put_failure;
1572
1573 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1574 if (macvlan_fill_info_macaddr(skb, vlan, i))
1575 goto nla_put_failure;
1576 }
1577 nla_nest_end(skb, nest);
1578 }
1579 return 0;
1580
1581 nla_put_failure:
1582 return -EMSGSIZE;
1583 }
1584
1585 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1586 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1587 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1588 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1589 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1590 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1591 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1592 };
1593
1594 int macvlan_link_register(struct rtnl_link_ops *ops)
1595 {
1596 /* common fields */
1597 ops->validate = macvlan_validate;
1598 ops->maxtype = IFLA_MACVLAN_MAX;
1599 ops->policy = macvlan_policy;
1600 ops->changelink = macvlan_changelink;
1601 ops->get_size = macvlan_get_size;
1602 ops->fill_info = macvlan_fill_info;
1603
1604 return rtnl_link_register(ops);
1605 };
1606 EXPORT_SYMBOL_GPL(macvlan_link_register);
1607
1608 static struct net *macvlan_get_link_net(const struct net_device *dev)
1609 {
1610 return dev_net(macvlan_dev_real_dev(dev));
1611 }
1612
1613 static struct rtnl_link_ops macvlan_link_ops = {
1614 .kind = "macvlan",
1615 .setup = macvlan_setup,
1616 .newlink = macvlan_newlink,
1617 .dellink = macvlan_dellink,
1618 .get_link_net = macvlan_get_link_net,
1619 .priv_size = sizeof(struct macvlan_dev),
1620 };
1621
1622 static int macvlan_device_event(struct notifier_block *unused,
1623 unsigned long event, void *ptr)
1624 {
1625 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1626 struct macvlan_dev *vlan, *next;
1627 struct macvlan_port *port;
1628 LIST_HEAD(list_kill);
1629
1630 if (!macvlan_port_exists(dev))
1631 return NOTIFY_DONE;
1632
1633 port = macvlan_port_get_rtnl(dev);
1634
1635 switch (event) {
1636 case NETDEV_UP:
1637 case NETDEV_CHANGE:
1638 list_for_each_entry(vlan, &port->vlans, list)
1639 netif_stacked_transfer_operstate(vlan->lowerdev,
1640 vlan->dev);
1641 break;
1642 case NETDEV_FEAT_CHANGE:
1643 list_for_each_entry(vlan, &port->vlans, list) {
1644 vlan->dev->gso_max_size = dev->gso_max_size;
1645 vlan->dev->gso_max_segs = dev->gso_max_segs;
1646 netdev_update_features(vlan->dev);
1647 }
1648 break;
1649 case NETDEV_CHANGEMTU:
1650 list_for_each_entry(vlan, &port->vlans, list) {
1651 if (vlan->dev->mtu <= dev->mtu)
1652 continue;
1653 dev_set_mtu(vlan->dev, dev->mtu);
1654 }
1655 break;
1656 case NETDEV_CHANGEADDR:
1657 if (!macvlan_passthru(port))
1658 return NOTIFY_DONE;
1659
1660 vlan = list_first_entry_or_null(&port->vlans,
1661 struct macvlan_dev,
1662 list);
1663
1664 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1665 return NOTIFY_BAD;
1666
1667 break;
1668 case NETDEV_UNREGISTER:
1669 /* twiddle thumbs on netns device moves */
1670 if (dev->reg_state != NETREG_UNREGISTERING)
1671 break;
1672
1673 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1674 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1675 unregister_netdevice_many(&list_kill);
1676 break;
1677 case NETDEV_PRE_TYPE_CHANGE:
1678 /* Forbid underlaying device to change its type. */
1679 return NOTIFY_BAD;
1680
1681 case NETDEV_NOTIFY_PEERS:
1682 case NETDEV_BONDING_FAILOVER:
1683 case NETDEV_RESEND_IGMP:
1684 /* Propagate to all vlans */
1685 list_for_each_entry(vlan, &port->vlans, list)
1686 call_netdevice_notifiers(event, vlan->dev);
1687 }
1688 return NOTIFY_DONE;
1689 }
1690
1691 static struct notifier_block macvlan_notifier_block __read_mostly = {
1692 .notifier_call = macvlan_device_event,
1693 };
1694
1695 static int __init macvlan_init_module(void)
1696 {
1697 int err;
1698
1699 register_netdevice_notifier(&macvlan_notifier_block);
1700
1701 err = macvlan_link_register(&macvlan_link_ops);
1702 if (err < 0)
1703 goto err1;
1704 return 0;
1705 err1:
1706 unregister_netdevice_notifier(&macvlan_notifier_block);
1707 return err;
1708 }
1709
1710 static void __exit macvlan_cleanup_module(void)
1711 {
1712 rtnl_link_unregister(&macvlan_link_ops);
1713 unregister_netdevice_notifier(&macvlan_notifier_block);
1714 }
1715
1716 module_init(macvlan_init_module);
1717 module_exit(macvlan_cleanup_module);
1718
1719 MODULE_LICENSE("GPL");
1720 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1721 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1722 MODULE_ALIAS_RTNL_LINK("macvlan");
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