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Merge branch '81xx' into omap-for-v4.4/fixes
[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_BITS 8
39 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
40 #define MACVLAN_BC_QUEUE_LEN 1000
41
42 struct macvlan_port {
43 struct net_device *dev;
44 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
45 struct list_head vlans;
46 struct rcu_head rcu;
47 struct sk_buff_head bc_queue;
48 struct work_struct bc_work;
49 bool passthru;
50 int count;
51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
52 };
53
54 struct macvlan_source_entry {
55 struct hlist_node hlist;
56 struct macvlan_dev *vlan;
57 unsigned char addr[6+2] __aligned(sizeof(u16));
58 struct rcu_head rcu;
59 };
60
61 struct macvlan_skb_cb {
62 const struct macvlan_dev *src;
63 };
64
65 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
66
67 static void macvlan_port_destroy(struct net_device *dev);
68
69 /* Hash Ethernet address */
70 static u32 macvlan_eth_hash(const unsigned char *addr)
71 {
72 u64 value = get_unaligned((u64 *)addr);
73
74 /* only want 6 bytes */
75 #ifdef __BIG_ENDIAN
76 value >>= 16;
77 #else
78 value <<= 16;
79 #endif
80 return hash_64(value, MACVLAN_HASH_BITS);
81 }
82
83 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
84 {
85 return rcu_dereference(dev->rx_handler_data);
86 }
87
88 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
89 {
90 return rtnl_dereference(dev->rx_handler_data);
91 }
92
93 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
94
95 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
96 const unsigned char *addr)
97 {
98 struct macvlan_dev *vlan;
99 u32 idx = macvlan_eth_hash(addr);
100
101 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
102 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
103 return vlan;
104 }
105 return NULL;
106 }
107
108 static struct macvlan_source_entry *macvlan_hash_lookup_source(
109 const struct macvlan_dev *vlan,
110 const unsigned char *addr)
111 {
112 struct macvlan_source_entry *entry;
113 u32 idx = macvlan_eth_hash(addr);
114 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
115
116 hlist_for_each_entry_rcu(entry, h, hlist) {
117 if (ether_addr_equal_64bits(entry->addr, addr) &&
118 entry->vlan == vlan)
119 return entry;
120 }
121 return NULL;
122 }
123
124 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
125 const unsigned char *addr)
126 {
127 struct macvlan_port *port = vlan->port;
128 struct macvlan_source_entry *entry;
129 struct hlist_head *h;
130
131 entry = macvlan_hash_lookup_source(vlan, addr);
132 if (entry)
133 return 0;
134
135 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
136 if (!entry)
137 return -ENOMEM;
138
139 ether_addr_copy(entry->addr, addr);
140 entry->vlan = vlan;
141 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
142 hlist_add_head_rcu(&entry->hlist, h);
143 vlan->macaddr_count++;
144
145 return 0;
146 }
147
148 static void macvlan_hash_add(struct macvlan_dev *vlan)
149 {
150 struct macvlan_port *port = vlan->port;
151 const unsigned char *addr = vlan->dev->dev_addr;
152 u32 idx = macvlan_eth_hash(addr);
153
154 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
155 }
156
157 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
158 {
159 hlist_del_rcu(&entry->hlist);
160 kfree_rcu(entry, rcu);
161 }
162
163 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
164 {
165 hlist_del_rcu(&vlan->hlist);
166 if (sync)
167 synchronize_rcu();
168 }
169
170 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
171 const unsigned char *addr)
172 {
173 macvlan_hash_del(vlan, true);
174 /* Now that we are unhashed it is safe to change the device
175 * address without confusing packet delivery.
176 */
177 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
178 macvlan_hash_add(vlan);
179 }
180
181 static int macvlan_addr_busy(const struct macvlan_port *port,
182 const unsigned char *addr)
183 {
184 /* Test to see if the specified multicast address is
185 * currently in use by the underlying device or
186 * another macvlan.
187 */
188 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
189 return 1;
190
191 if (macvlan_hash_lookup(port, addr))
192 return 1;
193
194 return 0;
195 }
196
197
198 static int macvlan_broadcast_one(struct sk_buff *skb,
199 const struct macvlan_dev *vlan,
200 const struct ethhdr *eth, bool local)
201 {
202 struct net_device *dev = vlan->dev;
203
204 if (local)
205 return __dev_forward_skb(dev, skb);
206
207 skb->dev = dev;
208 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
209 skb->pkt_type = PACKET_BROADCAST;
210 else
211 skb->pkt_type = PACKET_MULTICAST;
212
213 return 0;
214 }
215
216 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
217 {
218 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
219 }
220
221
222 static unsigned int mc_hash(const struct macvlan_dev *vlan,
223 const unsigned char *addr)
224 {
225 u32 val = __get_unaligned_cpu32(addr + 2);
226
227 val ^= macvlan_hash_mix(vlan);
228 return hash_32(val, MACVLAN_MC_FILTER_BITS);
229 }
230
231 static void macvlan_broadcast(struct sk_buff *skb,
232 const struct macvlan_port *port,
233 struct net_device *src,
234 enum macvlan_mode mode)
235 {
236 const struct ethhdr *eth = eth_hdr(skb);
237 const struct macvlan_dev *vlan;
238 struct sk_buff *nskb;
239 unsigned int i;
240 int err;
241 unsigned int hash;
242
243 if (skb->protocol == htons(ETH_P_PAUSE))
244 return;
245
246 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
247 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
248 if (vlan->dev == src || !(vlan->mode & mode))
249 continue;
250
251 hash = mc_hash(vlan, eth->h_dest);
252 if (!test_bit(hash, vlan->mc_filter))
253 continue;
254
255 err = NET_RX_DROP;
256 nskb = skb_clone(skb, GFP_ATOMIC);
257 if (likely(nskb))
258 err = macvlan_broadcast_one(
259 nskb, vlan, eth,
260 mode == MACVLAN_MODE_BRIDGE) ?:
261 netif_rx_ni(nskb);
262 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
263 err == NET_RX_SUCCESS, true);
264 }
265 }
266 }
267
268 static void macvlan_process_broadcast(struct work_struct *w)
269 {
270 struct macvlan_port *port = container_of(w, struct macvlan_port,
271 bc_work);
272 struct sk_buff *skb;
273 struct sk_buff_head list;
274
275 __skb_queue_head_init(&list);
276
277 spin_lock_bh(&port->bc_queue.lock);
278 skb_queue_splice_tail_init(&port->bc_queue, &list);
279 spin_unlock_bh(&port->bc_queue.lock);
280
281 while ((skb = __skb_dequeue(&list))) {
282 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
283
284 rcu_read_lock();
285
286 if (!src)
287 /* frame comes from an external address */
288 macvlan_broadcast(skb, port, NULL,
289 MACVLAN_MODE_PRIVATE |
290 MACVLAN_MODE_VEPA |
291 MACVLAN_MODE_PASSTHRU|
292 MACVLAN_MODE_BRIDGE);
293 else if (src->mode == MACVLAN_MODE_VEPA)
294 /* flood to everyone except source */
295 macvlan_broadcast(skb, port, src->dev,
296 MACVLAN_MODE_VEPA |
297 MACVLAN_MODE_BRIDGE);
298 else
299 /*
300 * flood only to VEPA ports, bridge ports
301 * already saw the frame on the way out.
302 */
303 macvlan_broadcast(skb, port, src->dev,
304 MACVLAN_MODE_VEPA);
305
306 rcu_read_unlock();
307
308 kfree_skb(skb);
309 }
310 }
311
312 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
313 struct sk_buff *skb)
314 {
315 struct sk_buff *nskb;
316 int err = -ENOMEM;
317
318 nskb = skb_clone(skb, GFP_ATOMIC);
319 if (!nskb)
320 goto err;
321
322 spin_lock(&port->bc_queue.lock);
323 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
324 __skb_queue_tail(&port->bc_queue, nskb);
325 err = 0;
326 }
327 spin_unlock(&port->bc_queue.lock);
328
329 if (err)
330 goto free_nskb;
331
332 schedule_work(&port->bc_work);
333 return;
334
335 free_nskb:
336 kfree_skb(nskb);
337 err:
338 atomic_long_inc(&skb->dev->rx_dropped);
339 }
340
341 static void macvlan_flush_sources(struct macvlan_port *port,
342 struct macvlan_dev *vlan)
343 {
344 int i;
345
346 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
347 struct hlist_node *h, *n;
348
349 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
350 struct macvlan_source_entry *entry;
351
352 entry = hlist_entry(h, struct macvlan_source_entry,
353 hlist);
354 if (entry->vlan == vlan)
355 macvlan_hash_del_source(entry);
356 }
357 }
358 vlan->macaddr_count = 0;
359 }
360
361 static void macvlan_forward_source_one(struct sk_buff *skb,
362 struct macvlan_dev *vlan)
363 {
364 struct sk_buff *nskb;
365 struct net_device *dev;
366 int len;
367 int ret;
368
369 dev = vlan->dev;
370 if (unlikely(!(dev->flags & IFF_UP)))
371 return;
372
373 nskb = skb_clone(skb, GFP_ATOMIC);
374 if (!nskb)
375 return;
376
377 len = nskb->len + ETH_HLEN;
378 nskb->dev = dev;
379 nskb->pkt_type = PACKET_HOST;
380
381 ret = netif_rx(nskb);
382 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
383 }
384
385 static void macvlan_forward_source(struct sk_buff *skb,
386 struct macvlan_port *port,
387 const unsigned char *addr)
388 {
389 struct macvlan_source_entry *entry;
390 u32 idx = macvlan_eth_hash(addr);
391 struct hlist_head *h = &port->vlan_source_hash[idx];
392
393 hlist_for_each_entry_rcu(entry, h, hlist) {
394 if (ether_addr_equal_64bits(entry->addr, addr))
395 if (entry->vlan->dev->flags & IFF_UP)
396 macvlan_forward_source_one(skb, entry->vlan);
397 }
398 }
399
400 /* called under rcu_read_lock() from netif_receive_skb */
401 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
402 {
403 struct macvlan_port *port;
404 struct sk_buff *skb = *pskb;
405 const struct ethhdr *eth = eth_hdr(skb);
406 const struct macvlan_dev *vlan;
407 const struct macvlan_dev *src;
408 struct net_device *dev;
409 unsigned int len = 0;
410 int ret;
411 rx_handler_result_t handle_res;
412
413 port = macvlan_port_get_rcu(skb->dev);
414 if (is_multicast_ether_addr(eth->h_dest)) {
415 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
416 if (!skb)
417 return RX_HANDLER_CONSUMED;
418 *pskb = skb;
419 eth = eth_hdr(skb);
420 macvlan_forward_source(skb, port, eth->h_source);
421 src = macvlan_hash_lookup(port, eth->h_source);
422 if (src && src->mode != MACVLAN_MODE_VEPA &&
423 src->mode != MACVLAN_MODE_BRIDGE) {
424 /* forward to original port. */
425 vlan = src;
426 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
427 netif_rx(skb);
428 handle_res = RX_HANDLER_CONSUMED;
429 goto out;
430 }
431
432 MACVLAN_SKB_CB(skb)->src = src;
433 macvlan_broadcast_enqueue(port, skb);
434
435 return RX_HANDLER_PASS;
436 }
437
438 macvlan_forward_source(skb, port, eth->h_source);
439 if (port->passthru)
440 vlan = list_first_or_null_rcu(&port->vlans,
441 struct macvlan_dev, list);
442 else
443 vlan = macvlan_hash_lookup(port, eth->h_dest);
444 if (vlan == NULL)
445 return RX_HANDLER_PASS;
446
447 dev = vlan->dev;
448 if (unlikely(!(dev->flags & IFF_UP))) {
449 kfree_skb(skb);
450 return RX_HANDLER_CONSUMED;
451 }
452 len = skb->len + ETH_HLEN;
453 skb = skb_share_check(skb, GFP_ATOMIC);
454 if (!skb) {
455 ret = NET_RX_DROP;
456 handle_res = RX_HANDLER_CONSUMED;
457 goto out;
458 }
459
460 *pskb = skb;
461 skb->dev = dev;
462 skb->pkt_type = PACKET_HOST;
463
464 ret = NET_RX_SUCCESS;
465 handle_res = RX_HANDLER_ANOTHER;
466 out:
467 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
468 return handle_res;
469 }
470
471 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
472 {
473 const struct macvlan_dev *vlan = netdev_priv(dev);
474 const struct macvlan_port *port = vlan->port;
475 const struct macvlan_dev *dest;
476
477 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
478 const struct ethhdr *eth = (void *)skb->data;
479
480 /* send to other bridge ports directly */
481 if (is_multicast_ether_addr(eth->h_dest)) {
482 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
483 goto xmit_world;
484 }
485
486 dest = macvlan_hash_lookup(port, eth->h_dest);
487 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
488 /* send to lowerdev first for its network taps */
489 dev_forward_skb(vlan->lowerdev, skb);
490
491 return NET_XMIT_SUCCESS;
492 }
493 }
494
495 xmit_world:
496 skb->dev = vlan->lowerdev;
497 return dev_queue_xmit(skb);
498 }
499
500 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
501 {
502 #ifdef CONFIG_NET_POLL_CONTROLLER
503 if (vlan->netpoll)
504 netpoll_send_skb(vlan->netpoll, skb);
505 #else
506 BUG();
507 #endif
508 return NETDEV_TX_OK;
509 }
510
511 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
512 struct net_device *dev)
513 {
514 unsigned int len = skb->len;
515 int ret;
516 struct macvlan_dev *vlan = netdev_priv(dev);
517
518 if (unlikely(netpoll_tx_running(dev)))
519 return macvlan_netpoll_send_skb(vlan, skb);
520
521 if (vlan->fwd_priv) {
522 skb->dev = vlan->lowerdev;
523 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
524 } else {
525 ret = macvlan_queue_xmit(skb, dev);
526 }
527
528 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
529 struct vlan_pcpu_stats *pcpu_stats;
530
531 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
532 u64_stats_update_begin(&pcpu_stats->syncp);
533 pcpu_stats->tx_packets++;
534 pcpu_stats->tx_bytes += len;
535 u64_stats_update_end(&pcpu_stats->syncp);
536 } else {
537 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
538 }
539 return ret;
540 }
541
542 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
543 unsigned short type, const void *daddr,
544 const void *saddr, unsigned len)
545 {
546 const struct macvlan_dev *vlan = netdev_priv(dev);
547 struct net_device *lowerdev = vlan->lowerdev;
548
549 return dev_hard_header(skb, lowerdev, type, daddr,
550 saddr ? : dev->dev_addr, len);
551 }
552
553 static const struct header_ops macvlan_hard_header_ops = {
554 .create = macvlan_hard_header,
555 .parse = eth_header_parse,
556 .cache = eth_header_cache,
557 .cache_update = eth_header_cache_update,
558 };
559
560 static struct rtnl_link_ops macvlan_link_ops;
561
562 static int macvlan_open(struct net_device *dev)
563 {
564 struct macvlan_dev *vlan = netdev_priv(dev);
565 struct net_device *lowerdev = vlan->lowerdev;
566 int err;
567
568 if (vlan->port->passthru) {
569 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
570 err = dev_set_promiscuity(lowerdev, 1);
571 if (err < 0)
572 goto out;
573 }
574 goto hash_add;
575 }
576
577 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
578 dev->rtnl_link_ops == &macvlan_link_ops) {
579 vlan->fwd_priv =
580 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
581
582 /* If we get a NULL pointer back, or if we get an error
583 * then we should just fall through to the non accelerated path
584 */
585 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
586 vlan->fwd_priv = NULL;
587 } else
588 return 0;
589 }
590
591 err = -EBUSY;
592 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
593 goto out;
594
595 err = dev_uc_add(lowerdev, dev->dev_addr);
596 if (err < 0)
597 goto out;
598 if (dev->flags & IFF_ALLMULTI) {
599 err = dev_set_allmulti(lowerdev, 1);
600 if (err < 0)
601 goto del_unicast;
602 }
603
604 if (dev->flags & IFF_PROMISC) {
605 err = dev_set_promiscuity(lowerdev, 1);
606 if (err < 0)
607 goto clear_multi;
608 }
609
610 hash_add:
611 macvlan_hash_add(vlan);
612 return 0;
613
614 clear_multi:
615 dev_set_allmulti(lowerdev, -1);
616 del_unicast:
617 dev_uc_del(lowerdev, dev->dev_addr);
618 out:
619 if (vlan->fwd_priv) {
620 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
621 vlan->fwd_priv);
622 vlan->fwd_priv = NULL;
623 }
624 return err;
625 }
626
627 static int macvlan_stop(struct net_device *dev)
628 {
629 struct macvlan_dev *vlan = netdev_priv(dev);
630 struct net_device *lowerdev = vlan->lowerdev;
631
632 if (vlan->fwd_priv) {
633 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
634 vlan->fwd_priv);
635 vlan->fwd_priv = NULL;
636 return 0;
637 }
638
639 dev_uc_unsync(lowerdev, dev);
640 dev_mc_unsync(lowerdev, dev);
641
642 if (vlan->port->passthru) {
643 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
644 dev_set_promiscuity(lowerdev, -1);
645 goto hash_del;
646 }
647
648 if (dev->flags & IFF_ALLMULTI)
649 dev_set_allmulti(lowerdev, -1);
650
651 if (dev->flags & IFF_PROMISC)
652 dev_set_promiscuity(lowerdev, -1);
653
654 dev_uc_del(lowerdev, dev->dev_addr);
655
656 hash_del:
657 macvlan_hash_del(vlan, !dev->dismantle);
658 return 0;
659 }
660
661 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
662 {
663 struct macvlan_dev *vlan = netdev_priv(dev);
664 struct net_device *lowerdev = vlan->lowerdev;
665 int err;
666
667 if (!(dev->flags & IFF_UP)) {
668 /* Just copy in the new address */
669 ether_addr_copy(dev->dev_addr, addr);
670 } else {
671 /* Rehash and update the device filters */
672 if (macvlan_addr_busy(vlan->port, addr))
673 return -EBUSY;
674
675 if (!vlan->port->passthru) {
676 err = dev_uc_add(lowerdev, addr);
677 if (err)
678 return err;
679
680 dev_uc_del(lowerdev, dev->dev_addr);
681 }
682
683 macvlan_hash_change_addr(vlan, addr);
684 }
685 return 0;
686 }
687
688 static int macvlan_set_mac_address(struct net_device *dev, void *p)
689 {
690 struct macvlan_dev *vlan = netdev_priv(dev);
691 struct sockaddr *addr = p;
692
693 if (!is_valid_ether_addr(addr->sa_data))
694 return -EADDRNOTAVAIL;
695
696 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
697 dev_set_mac_address(vlan->lowerdev, addr);
698 return 0;
699 }
700
701 return macvlan_sync_address(dev, addr->sa_data);
702 }
703
704 static void macvlan_change_rx_flags(struct net_device *dev, int change)
705 {
706 struct macvlan_dev *vlan = netdev_priv(dev);
707 struct net_device *lowerdev = vlan->lowerdev;
708
709 if (dev->flags & IFF_UP) {
710 if (change & IFF_ALLMULTI)
711 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
712 if (change & IFF_PROMISC)
713 dev_set_promiscuity(lowerdev,
714 dev->flags & IFF_PROMISC ? 1 : -1);
715
716 }
717 }
718
719 static void macvlan_set_mac_lists(struct net_device *dev)
720 {
721 struct macvlan_dev *vlan = netdev_priv(dev);
722
723 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
724 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
725 } else {
726 struct netdev_hw_addr *ha;
727 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
728
729 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
730 netdev_for_each_mc_addr(ha, dev) {
731 __set_bit(mc_hash(vlan, ha->addr), filter);
732 }
733
734 __set_bit(mc_hash(vlan, dev->broadcast), filter);
735
736 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
737 }
738 dev_uc_sync(vlan->lowerdev, dev);
739 dev_mc_sync(vlan->lowerdev, dev);
740 }
741
742 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
743 {
744 struct macvlan_dev *vlan = netdev_priv(dev);
745
746 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
747 return -EINVAL;
748 dev->mtu = new_mtu;
749 return 0;
750 }
751
752 /*
753 * macvlan network devices have devices nesting below it and are a special
754 * "super class" of normal network devices; split their locks off into a
755 * separate class since they always nest.
756 */
757 static struct lock_class_key macvlan_netdev_xmit_lock_key;
758 static struct lock_class_key macvlan_netdev_addr_lock_key;
759
760 #define ALWAYS_ON_FEATURES \
761 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
762 NETIF_F_GSO_ROBUST)
763
764 #define MACVLAN_FEATURES \
765 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
766 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
767 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
768 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
769
770 #define MACVLAN_STATE_MASK \
771 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
772
773 static int macvlan_get_nest_level(struct net_device *dev)
774 {
775 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
776 }
777
778 static void macvlan_set_lockdep_class_one(struct net_device *dev,
779 struct netdev_queue *txq,
780 void *_unused)
781 {
782 lockdep_set_class(&txq->_xmit_lock,
783 &macvlan_netdev_xmit_lock_key);
784 }
785
786 static void macvlan_set_lockdep_class(struct net_device *dev)
787 {
788 lockdep_set_class_and_subclass(&dev->addr_list_lock,
789 &macvlan_netdev_addr_lock_key,
790 macvlan_get_nest_level(dev));
791 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
792 }
793
794 static int macvlan_init(struct net_device *dev)
795 {
796 struct macvlan_dev *vlan = netdev_priv(dev);
797 const struct net_device *lowerdev = vlan->lowerdev;
798
799 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
800 (lowerdev->state & MACVLAN_STATE_MASK);
801 dev->features = lowerdev->features & MACVLAN_FEATURES;
802 dev->features |= ALWAYS_ON_FEATURES;
803 dev->hw_features |= NETIF_F_LRO;
804 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
805 dev->gso_max_size = lowerdev->gso_max_size;
806 dev->hard_header_len = lowerdev->hard_header_len;
807
808 macvlan_set_lockdep_class(dev);
809
810 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
811 if (!vlan->pcpu_stats)
812 return -ENOMEM;
813
814 return 0;
815 }
816
817 static void macvlan_uninit(struct net_device *dev)
818 {
819 struct macvlan_dev *vlan = netdev_priv(dev);
820 struct macvlan_port *port = vlan->port;
821
822 free_percpu(vlan->pcpu_stats);
823
824 macvlan_flush_sources(port, vlan);
825 port->count -= 1;
826 if (!port->count)
827 macvlan_port_destroy(port->dev);
828 }
829
830 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
831 struct rtnl_link_stats64 *stats)
832 {
833 struct macvlan_dev *vlan = netdev_priv(dev);
834
835 if (vlan->pcpu_stats) {
836 struct vlan_pcpu_stats *p;
837 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
838 u32 rx_errors = 0, tx_dropped = 0;
839 unsigned int start;
840 int i;
841
842 for_each_possible_cpu(i) {
843 p = per_cpu_ptr(vlan->pcpu_stats, i);
844 do {
845 start = u64_stats_fetch_begin_irq(&p->syncp);
846 rx_packets = p->rx_packets;
847 rx_bytes = p->rx_bytes;
848 rx_multicast = p->rx_multicast;
849 tx_packets = p->tx_packets;
850 tx_bytes = p->tx_bytes;
851 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
852
853 stats->rx_packets += rx_packets;
854 stats->rx_bytes += rx_bytes;
855 stats->multicast += rx_multicast;
856 stats->tx_packets += tx_packets;
857 stats->tx_bytes += tx_bytes;
858 /* rx_errors & tx_dropped are u32, updated
859 * without syncp protection.
860 */
861 rx_errors += p->rx_errors;
862 tx_dropped += p->tx_dropped;
863 }
864 stats->rx_errors = rx_errors;
865 stats->rx_dropped = rx_errors;
866 stats->tx_dropped = tx_dropped;
867 }
868 return stats;
869 }
870
871 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
872 __be16 proto, u16 vid)
873 {
874 struct macvlan_dev *vlan = netdev_priv(dev);
875 struct net_device *lowerdev = vlan->lowerdev;
876
877 return vlan_vid_add(lowerdev, proto, vid);
878 }
879
880 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
881 __be16 proto, u16 vid)
882 {
883 struct macvlan_dev *vlan = netdev_priv(dev);
884 struct net_device *lowerdev = vlan->lowerdev;
885
886 vlan_vid_del(lowerdev, proto, vid);
887 return 0;
888 }
889
890 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
891 struct net_device *dev,
892 const unsigned char *addr, u16 vid,
893 u16 flags)
894 {
895 struct macvlan_dev *vlan = netdev_priv(dev);
896 int err = -EINVAL;
897
898 /* Support unicast filter only on passthru devices.
899 * Multicast filter should be allowed on all devices.
900 */
901 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
902 return -EOPNOTSUPP;
903
904 if (flags & NLM_F_REPLACE)
905 return -EOPNOTSUPP;
906
907 if (is_unicast_ether_addr(addr))
908 err = dev_uc_add_excl(dev, addr);
909 else if (is_multicast_ether_addr(addr))
910 err = dev_mc_add_excl(dev, addr);
911
912 return err;
913 }
914
915 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
916 struct net_device *dev,
917 const unsigned char *addr, u16 vid)
918 {
919 struct macvlan_dev *vlan = netdev_priv(dev);
920 int err = -EINVAL;
921
922 /* Support unicast filter only on passthru devices.
923 * Multicast filter should be allowed on all devices.
924 */
925 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
926 return -EOPNOTSUPP;
927
928 if (is_unicast_ether_addr(addr))
929 err = dev_uc_del(dev, addr);
930 else if (is_multicast_ether_addr(addr))
931 err = dev_mc_del(dev, addr);
932
933 return err;
934 }
935
936 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
937 struct ethtool_drvinfo *drvinfo)
938 {
939 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
940 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
941 }
942
943 static int macvlan_ethtool_get_settings(struct net_device *dev,
944 struct ethtool_cmd *cmd)
945 {
946 const struct macvlan_dev *vlan = netdev_priv(dev);
947
948 return __ethtool_get_settings(vlan->lowerdev, cmd);
949 }
950
951 static netdev_features_t macvlan_fix_features(struct net_device *dev,
952 netdev_features_t features)
953 {
954 struct macvlan_dev *vlan = netdev_priv(dev);
955 netdev_features_t lowerdev_features = vlan->lowerdev->features;
956 netdev_features_t mask;
957
958 features |= NETIF_F_ALL_FOR_ALL;
959 features &= (vlan->set_features | ~MACVLAN_FEATURES);
960 mask = features;
961
962 lowerdev_features &= (features | ~NETIF_F_LRO);
963 features = netdev_increment_features(lowerdev_features, features, mask);
964 features |= ALWAYS_ON_FEATURES;
965 features &= ~NETIF_F_NETNS_LOCAL;
966
967 return features;
968 }
969
970 #ifdef CONFIG_NET_POLL_CONTROLLER
971 static void macvlan_dev_poll_controller(struct net_device *dev)
972 {
973 return;
974 }
975
976 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
977 {
978 struct macvlan_dev *vlan = netdev_priv(dev);
979 struct net_device *real_dev = vlan->lowerdev;
980 struct netpoll *netpoll;
981 int err = 0;
982
983 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
984 err = -ENOMEM;
985 if (!netpoll)
986 goto out;
987
988 err = __netpoll_setup(netpoll, real_dev);
989 if (err) {
990 kfree(netpoll);
991 goto out;
992 }
993
994 vlan->netpoll = netpoll;
995
996 out:
997 return err;
998 }
999
1000 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1001 {
1002 struct macvlan_dev *vlan = netdev_priv(dev);
1003 struct netpoll *netpoll = vlan->netpoll;
1004
1005 if (!netpoll)
1006 return;
1007
1008 vlan->netpoll = NULL;
1009
1010 __netpoll_free_async(netpoll);
1011 }
1012 #endif /* CONFIG_NET_POLL_CONTROLLER */
1013
1014 static int macvlan_dev_get_iflink(const struct net_device *dev)
1015 {
1016 struct macvlan_dev *vlan = netdev_priv(dev);
1017
1018 return vlan->lowerdev->ifindex;
1019 }
1020
1021 static const struct ethtool_ops macvlan_ethtool_ops = {
1022 .get_link = ethtool_op_get_link,
1023 .get_settings = macvlan_ethtool_get_settings,
1024 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1025 };
1026
1027 static const struct net_device_ops macvlan_netdev_ops = {
1028 .ndo_init = macvlan_init,
1029 .ndo_uninit = macvlan_uninit,
1030 .ndo_open = macvlan_open,
1031 .ndo_stop = macvlan_stop,
1032 .ndo_start_xmit = macvlan_start_xmit,
1033 .ndo_change_mtu = macvlan_change_mtu,
1034 .ndo_fix_features = macvlan_fix_features,
1035 .ndo_change_rx_flags = macvlan_change_rx_flags,
1036 .ndo_set_mac_address = macvlan_set_mac_address,
1037 .ndo_set_rx_mode = macvlan_set_mac_lists,
1038 .ndo_get_stats64 = macvlan_dev_get_stats64,
1039 .ndo_validate_addr = eth_validate_addr,
1040 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1041 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1042 .ndo_fdb_add = macvlan_fdb_add,
1043 .ndo_fdb_del = macvlan_fdb_del,
1044 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1045 .ndo_get_lock_subclass = macvlan_get_nest_level,
1046 #ifdef CONFIG_NET_POLL_CONTROLLER
1047 .ndo_poll_controller = macvlan_dev_poll_controller,
1048 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1049 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1050 #endif
1051 .ndo_get_iflink = macvlan_dev_get_iflink,
1052 .ndo_features_check = passthru_features_check,
1053 };
1054
1055 void macvlan_common_setup(struct net_device *dev)
1056 {
1057 ether_setup(dev);
1058
1059 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1060 netif_keep_dst(dev);
1061 dev->priv_flags |= IFF_UNICAST_FLT;
1062 dev->netdev_ops = &macvlan_netdev_ops;
1063 dev->destructor = free_netdev;
1064 dev->header_ops = &macvlan_hard_header_ops;
1065 dev->ethtool_ops = &macvlan_ethtool_ops;
1066 }
1067 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1068
1069 static void macvlan_setup(struct net_device *dev)
1070 {
1071 macvlan_common_setup(dev);
1072 dev->tx_queue_len = 0;
1073 }
1074
1075 static int macvlan_port_create(struct net_device *dev)
1076 {
1077 struct macvlan_port *port;
1078 unsigned int i;
1079 int err;
1080
1081 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1082 return -EINVAL;
1083
1084 if (netif_is_ipvlan_port(dev))
1085 return -EBUSY;
1086
1087 port = kzalloc(sizeof(*port), GFP_KERNEL);
1088 if (port == NULL)
1089 return -ENOMEM;
1090
1091 port->passthru = false;
1092 port->dev = dev;
1093 INIT_LIST_HEAD(&port->vlans);
1094 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1095 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1096 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1097 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1098
1099 skb_queue_head_init(&port->bc_queue);
1100 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1101
1102 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1103 if (err)
1104 kfree(port);
1105 else
1106 dev->priv_flags |= IFF_MACVLAN_PORT;
1107 return err;
1108 }
1109
1110 static void macvlan_port_destroy(struct net_device *dev)
1111 {
1112 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1113
1114 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1115 netdev_rx_handler_unregister(dev);
1116
1117 /* After this point, no packet can schedule bc_work anymore,
1118 * but we need to cancel it and purge left skbs if any.
1119 */
1120 cancel_work_sync(&port->bc_work);
1121 __skb_queue_purge(&port->bc_queue);
1122
1123 kfree_rcu(port, rcu);
1124 }
1125
1126 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1127 {
1128 if (tb[IFLA_ADDRESS]) {
1129 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1130 return -EINVAL;
1131 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1132 return -EADDRNOTAVAIL;
1133 }
1134
1135 if (data && data[IFLA_MACVLAN_FLAGS] &&
1136 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1137 return -EINVAL;
1138
1139 if (data && data[IFLA_MACVLAN_MODE]) {
1140 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1141 case MACVLAN_MODE_PRIVATE:
1142 case MACVLAN_MODE_VEPA:
1143 case MACVLAN_MODE_BRIDGE:
1144 case MACVLAN_MODE_PASSTHRU:
1145 case MACVLAN_MODE_SOURCE:
1146 break;
1147 default:
1148 return -EINVAL;
1149 }
1150 }
1151
1152 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1153 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1154 case MACVLAN_MACADDR_ADD:
1155 case MACVLAN_MACADDR_DEL:
1156 case MACVLAN_MACADDR_FLUSH:
1157 case MACVLAN_MACADDR_SET:
1158 break;
1159 default:
1160 return -EINVAL;
1161 }
1162 }
1163
1164 if (data && data[IFLA_MACVLAN_MACADDR]) {
1165 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1166 return -EINVAL;
1167
1168 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1169 return -EADDRNOTAVAIL;
1170 }
1171
1172 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1173 return -EINVAL;
1174
1175 return 0;
1176 }
1177
1178 /**
1179 * reconfigure list of remote source mac address
1180 * (only for macvlan devices in source mode)
1181 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1182 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1183 */
1184 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1185 struct nlattr *data[])
1186 {
1187 char *addr = NULL;
1188 int ret, rem, len;
1189 struct nlattr *nla, *head;
1190 struct macvlan_source_entry *entry;
1191
1192 if (data[IFLA_MACVLAN_MACADDR])
1193 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1194
1195 if (mode == MACVLAN_MACADDR_ADD) {
1196 if (!addr)
1197 return -EINVAL;
1198
1199 return macvlan_hash_add_source(vlan, addr);
1200
1201 } else if (mode == MACVLAN_MACADDR_DEL) {
1202 if (!addr)
1203 return -EINVAL;
1204
1205 entry = macvlan_hash_lookup_source(vlan, addr);
1206 if (entry) {
1207 macvlan_hash_del_source(entry);
1208 vlan->macaddr_count--;
1209 }
1210 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1211 macvlan_flush_sources(vlan->port, vlan);
1212 } else if (mode == MACVLAN_MACADDR_SET) {
1213 macvlan_flush_sources(vlan->port, vlan);
1214
1215 if (addr) {
1216 ret = macvlan_hash_add_source(vlan, addr);
1217 if (ret)
1218 return ret;
1219 }
1220
1221 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1222 return 0;
1223
1224 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1225 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1226
1227 nla_for_each_attr(nla, head, len, rem) {
1228 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1229 nla_len(nla) != ETH_ALEN)
1230 continue;
1231
1232 addr = nla_data(nla);
1233 ret = macvlan_hash_add_source(vlan, addr);
1234 if (ret)
1235 return ret;
1236 }
1237 } else {
1238 return -EINVAL;
1239 }
1240
1241 return 0;
1242 }
1243
1244 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1245 struct nlattr *tb[], struct nlattr *data[])
1246 {
1247 struct macvlan_dev *vlan = netdev_priv(dev);
1248 struct macvlan_port *port;
1249 struct net_device *lowerdev;
1250 int err;
1251 int macmode;
1252
1253 if (!tb[IFLA_LINK])
1254 return -EINVAL;
1255
1256 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1257 if (lowerdev == NULL)
1258 return -ENODEV;
1259
1260 /* When creating macvlans or macvtaps on top of other macvlans - use
1261 * the real device as the lowerdev.
1262 */
1263 if (netif_is_macvlan(lowerdev))
1264 lowerdev = macvlan_dev_real_dev(lowerdev);
1265
1266 if (!tb[IFLA_MTU])
1267 dev->mtu = lowerdev->mtu;
1268 else if (dev->mtu > lowerdev->mtu)
1269 return -EINVAL;
1270
1271 if (!tb[IFLA_ADDRESS])
1272 eth_hw_addr_random(dev);
1273
1274 if (!macvlan_port_exists(lowerdev)) {
1275 err = macvlan_port_create(lowerdev);
1276 if (err < 0)
1277 return err;
1278 }
1279 port = macvlan_port_get_rtnl(lowerdev);
1280
1281 /* Only 1 macvlan device can be created in passthru mode */
1282 if (port->passthru)
1283 return -EINVAL;
1284
1285 vlan->lowerdev = lowerdev;
1286 vlan->dev = dev;
1287 vlan->port = port;
1288 vlan->set_features = MACVLAN_FEATURES;
1289 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1290
1291 vlan->mode = MACVLAN_MODE_VEPA;
1292 if (data && data[IFLA_MACVLAN_MODE])
1293 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1294
1295 if (data && data[IFLA_MACVLAN_FLAGS])
1296 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1297
1298 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1299 if (port->count)
1300 return -EINVAL;
1301 port->passthru = true;
1302 eth_hw_addr_inherit(dev, lowerdev);
1303 }
1304
1305 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1306 if (vlan->mode != MACVLAN_MODE_SOURCE)
1307 return -EINVAL;
1308 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1309 err = macvlan_changelink_sources(vlan, macmode, data);
1310 if (err)
1311 return err;
1312 }
1313
1314 port->count += 1;
1315 err = register_netdevice(dev);
1316 if (err < 0)
1317 goto destroy_port;
1318
1319 dev->priv_flags |= IFF_MACVLAN;
1320 err = netdev_upper_dev_link(lowerdev, dev);
1321 if (err)
1322 goto unregister_netdev;
1323
1324 list_add_tail_rcu(&vlan->list, &port->vlans);
1325 netif_stacked_transfer_operstate(lowerdev, dev);
1326
1327 return 0;
1328
1329 unregister_netdev:
1330 unregister_netdevice(dev);
1331 destroy_port:
1332 port->count -= 1;
1333 if (!port->count)
1334 macvlan_port_destroy(lowerdev);
1335
1336 return err;
1337 }
1338 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1339
1340 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1341 struct nlattr *tb[], struct nlattr *data[])
1342 {
1343 return macvlan_common_newlink(src_net, dev, tb, data);
1344 }
1345
1346 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1347 {
1348 struct macvlan_dev *vlan = netdev_priv(dev);
1349
1350 if (vlan->mode == MACVLAN_MODE_SOURCE)
1351 macvlan_flush_sources(vlan->port, vlan);
1352 list_del_rcu(&vlan->list);
1353 unregister_netdevice_queue(dev, head);
1354 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1355 }
1356 EXPORT_SYMBOL_GPL(macvlan_dellink);
1357
1358 static int macvlan_changelink(struct net_device *dev,
1359 struct nlattr *tb[], struct nlattr *data[])
1360 {
1361 struct macvlan_dev *vlan = netdev_priv(dev);
1362 enum macvlan_mode mode;
1363 bool set_mode = false;
1364 enum macvlan_macaddr_mode macmode;
1365 int ret;
1366
1367 /* Validate mode, but don't set yet: setting flags may fail. */
1368 if (data && data[IFLA_MACVLAN_MODE]) {
1369 set_mode = true;
1370 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1371 /* Passthrough mode can't be set or cleared dynamically */
1372 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1373 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1374 return -EINVAL;
1375 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1376 vlan->mode != mode)
1377 macvlan_flush_sources(vlan->port, vlan);
1378 }
1379
1380 if (data && data[IFLA_MACVLAN_FLAGS]) {
1381 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1382 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1383 if (vlan->port->passthru && promisc) {
1384 int err;
1385
1386 if (flags & MACVLAN_FLAG_NOPROMISC)
1387 err = dev_set_promiscuity(vlan->lowerdev, -1);
1388 else
1389 err = dev_set_promiscuity(vlan->lowerdev, 1);
1390 if (err < 0)
1391 return err;
1392 }
1393 vlan->flags = flags;
1394 }
1395 if (set_mode)
1396 vlan->mode = mode;
1397 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1398 if (vlan->mode != MACVLAN_MODE_SOURCE)
1399 return -EINVAL;
1400 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1401 ret = macvlan_changelink_sources(vlan, macmode, data);
1402 if (ret)
1403 return ret;
1404 }
1405 return 0;
1406 }
1407
1408 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1409 {
1410 if (vlan->macaddr_count == 0)
1411 return 0;
1412 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1413 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1414 }
1415
1416 static size_t macvlan_get_size(const struct net_device *dev)
1417 {
1418 struct macvlan_dev *vlan = netdev_priv(dev);
1419
1420 return (0
1421 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1422 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1423 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1424 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1425 );
1426 }
1427
1428 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1429 const struct macvlan_dev *vlan,
1430 const int i)
1431 {
1432 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1433 struct macvlan_source_entry *entry;
1434
1435 hlist_for_each_entry_rcu(entry, h, hlist) {
1436 if (entry->vlan != vlan)
1437 continue;
1438 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1439 return 1;
1440 }
1441 return 0;
1442 }
1443
1444 static int macvlan_fill_info(struct sk_buff *skb,
1445 const struct net_device *dev)
1446 {
1447 struct macvlan_dev *vlan = netdev_priv(dev);
1448 int i;
1449 struct nlattr *nest;
1450
1451 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1452 goto nla_put_failure;
1453 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1454 goto nla_put_failure;
1455 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1456 goto nla_put_failure;
1457 if (vlan->macaddr_count > 0) {
1458 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1459 if (nest == NULL)
1460 goto nla_put_failure;
1461
1462 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1463 if (macvlan_fill_info_macaddr(skb, vlan, i))
1464 goto nla_put_failure;
1465 }
1466 nla_nest_end(skb, nest);
1467 }
1468 return 0;
1469
1470 nla_put_failure:
1471 return -EMSGSIZE;
1472 }
1473
1474 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1475 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1476 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1477 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1478 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1479 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1480 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1481 };
1482
1483 int macvlan_link_register(struct rtnl_link_ops *ops)
1484 {
1485 /* common fields */
1486 ops->priv_size = sizeof(struct macvlan_dev);
1487 ops->validate = macvlan_validate;
1488 ops->maxtype = IFLA_MACVLAN_MAX;
1489 ops->policy = macvlan_policy;
1490 ops->changelink = macvlan_changelink;
1491 ops->get_size = macvlan_get_size;
1492 ops->fill_info = macvlan_fill_info;
1493
1494 return rtnl_link_register(ops);
1495 };
1496 EXPORT_SYMBOL_GPL(macvlan_link_register);
1497
1498 static struct net *macvlan_get_link_net(const struct net_device *dev)
1499 {
1500 return dev_net(macvlan_dev_real_dev(dev));
1501 }
1502
1503 static struct rtnl_link_ops macvlan_link_ops = {
1504 .kind = "macvlan",
1505 .setup = macvlan_setup,
1506 .newlink = macvlan_newlink,
1507 .dellink = macvlan_dellink,
1508 .get_link_net = macvlan_get_link_net,
1509 };
1510
1511 static int macvlan_device_event(struct notifier_block *unused,
1512 unsigned long event, void *ptr)
1513 {
1514 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1515 struct macvlan_dev *vlan, *next;
1516 struct macvlan_port *port;
1517 LIST_HEAD(list_kill);
1518
1519 if (!macvlan_port_exists(dev))
1520 return NOTIFY_DONE;
1521
1522 port = macvlan_port_get_rtnl(dev);
1523
1524 switch (event) {
1525 case NETDEV_CHANGE:
1526 list_for_each_entry(vlan, &port->vlans, list)
1527 netif_stacked_transfer_operstate(vlan->lowerdev,
1528 vlan->dev);
1529 break;
1530 case NETDEV_FEAT_CHANGE:
1531 list_for_each_entry(vlan, &port->vlans, list) {
1532 vlan->dev->gso_max_size = dev->gso_max_size;
1533 netdev_update_features(vlan->dev);
1534 }
1535 break;
1536 case NETDEV_CHANGEMTU:
1537 list_for_each_entry(vlan, &port->vlans, list) {
1538 if (vlan->dev->mtu <= dev->mtu)
1539 continue;
1540 dev_set_mtu(vlan->dev, dev->mtu);
1541 }
1542 break;
1543 case NETDEV_CHANGEADDR:
1544 if (!port->passthru)
1545 return NOTIFY_DONE;
1546
1547 vlan = list_first_entry_or_null(&port->vlans,
1548 struct macvlan_dev,
1549 list);
1550
1551 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1552 return NOTIFY_BAD;
1553
1554 break;
1555 case NETDEV_UNREGISTER:
1556 /* twiddle thumbs on netns device moves */
1557 if (dev->reg_state != NETREG_UNREGISTERING)
1558 break;
1559
1560 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1561 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1562 unregister_netdevice_many(&list_kill);
1563 break;
1564 case NETDEV_PRE_TYPE_CHANGE:
1565 /* Forbid underlaying device to change its type. */
1566 return NOTIFY_BAD;
1567
1568 case NETDEV_NOTIFY_PEERS:
1569 case NETDEV_BONDING_FAILOVER:
1570 case NETDEV_RESEND_IGMP:
1571 /* Propagate to all vlans */
1572 list_for_each_entry(vlan, &port->vlans, list)
1573 call_netdevice_notifiers(event, vlan->dev);
1574 }
1575 return NOTIFY_DONE;
1576 }
1577
1578 static struct notifier_block macvlan_notifier_block __read_mostly = {
1579 .notifier_call = macvlan_device_event,
1580 };
1581
1582 static int __init macvlan_init_module(void)
1583 {
1584 int err;
1585
1586 register_netdevice_notifier(&macvlan_notifier_block);
1587
1588 err = macvlan_link_register(&macvlan_link_ops);
1589 if (err < 0)
1590 goto err1;
1591 return 0;
1592 err1:
1593 unregister_netdevice_notifier(&macvlan_notifier_block);
1594 return err;
1595 }
1596
1597 static void __exit macvlan_cleanup_module(void)
1598 {
1599 rtnl_link_unregister(&macvlan_link_ops);
1600 unregister_netdevice_notifier(&macvlan_notifier_block);
1601 }
1602
1603 module_init(macvlan_init_module);
1604 module_exit(macvlan_cleanup_module);
1605
1606 MODULE_LICENSE("GPL");
1607 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1608 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1609 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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