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[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(skb, IP_DEFRAG_MACVLAN);
416 if (!skb)
417 return RX_HANDLER_CONSUMED;
418 eth = eth_hdr(skb);
419 macvlan_forward_source(skb, port, eth->h_source);
420 src = macvlan_hash_lookup(port, eth->h_source);
421 if (src && src->mode != MACVLAN_MODE_VEPA &&
422 src->mode != MACVLAN_MODE_BRIDGE) {
423 /* forward to original port. */
424 vlan = src;
425 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
426 netif_rx(skb);
427 handle_res = RX_HANDLER_CONSUMED;
428 goto out;
429 }
430
431 MACVLAN_SKB_CB(skb)->src = src;
432 macvlan_broadcast_enqueue(port, skb);
433
434 return RX_HANDLER_PASS;
435 }
436
437 macvlan_forward_source(skb, port, eth->h_source);
438 if (port->passthru)
439 vlan = list_first_or_null_rcu(&port->vlans,
440 struct macvlan_dev, list);
441 else
442 vlan = macvlan_hash_lookup(port, eth->h_dest);
443 if (vlan == NULL)
444 return RX_HANDLER_PASS;
445
446 dev = vlan->dev;
447 if (unlikely(!(dev->flags & IFF_UP))) {
448 kfree_skb(skb);
449 return RX_HANDLER_CONSUMED;
450 }
451 len = skb->len + ETH_HLEN;
452 skb = skb_share_check(skb, GFP_ATOMIC);
453 if (!skb) {
454 ret = NET_RX_DROP;
455 handle_res = RX_HANDLER_CONSUMED;
456 goto out;
457 }
458
459 skb->dev = dev;
460 skb->pkt_type = PACKET_HOST;
461
462 ret = NET_RX_SUCCESS;
463 handle_res = RX_HANDLER_ANOTHER;
464 out:
465 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
466 return handle_res;
467 }
468
469 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
470 {
471 const struct macvlan_dev *vlan = netdev_priv(dev);
472 const struct macvlan_port *port = vlan->port;
473 const struct macvlan_dev *dest;
474
475 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
476 const struct ethhdr *eth = (void *)skb->data;
477
478 /* send to other bridge ports directly */
479 if (is_multicast_ether_addr(eth->h_dest)) {
480 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
481 goto xmit_world;
482 }
483
484 dest = macvlan_hash_lookup(port, eth->h_dest);
485 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
486 /* send to lowerdev first for its network taps */
487 dev_forward_skb(vlan->lowerdev, skb);
488
489 return NET_XMIT_SUCCESS;
490 }
491 }
492
493 xmit_world:
494 skb->dev = vlan->lowerdev;
495 return dev_queue_xmit(skb);
496 }
497
498 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
499 {
500 #ifdef CONFIG_NET_POLL_CONTROLLER
501 if (vlan->netpoll)
502 netpoll_send_skb(vlan->netpoll, skb);
503 #else
504 BUG();
505 #endif
506 return NETDEV_TX_OK;
507 }
508
509 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
510 struct net_device *dev)
511 {
512 unsigned int len = skb->len;
513 int ret;
514 struct macvlan_dev *vlan = netdev_priv(dev);
515
516 if (unlikely(netpoll_tx_running(dev)))
517 return macvlan_netpoll_send_skb(vlan, skb);
518
519 if (vlan->fwd_priv) {
520 skb->dev = vlan->lowerdev;
521 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
522 } else {
523 ret = macvlan_queue_xmit(skb, dev);
524 }
525
526 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
527 struct vlan_pcpu_stats *pcpu_stats;
528
529 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
530 u64_stats_update_begin(&pcpu_stats->syncp);
531 pcpu_stats->tx_packets++;
532 pcpu_stats->tx_bytes += len;
533 u64_stats_update_end(&pcpu_stats->syncp);
534 } else {
535 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
536 }
537 return ret;
538 }
539
540 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
541 unsigned short type, const void *daddr,
542 const void *saddr, unsigned len)
543 {
544 const struct macvlan_dev *vlan = netdev_priv(dev);
545 struct net_device *lowerdev = vlan->lowerdev;
546
547 return dev_hard_header(skb, lowerdev, type, daddr,
548 saddr ? : dev->dev_addr, len);
549 }
550
551 static const struct header_ops macvlan_hard_header_ops = {
552 .create = macvlan_hard_header,
553 .parse = eth_header_parse,
554 .cache = eth_header_cache,
555 .cache_update = eth_header_cache_update,
556 };
557
558 static struct rtnl_link_ops macvlan_link_ops;
559
560 static int macvlan_open(struct net_device *dev)
561 {
562 struct macvlan_dev *vlan = netdev_priv(dev);
563 struct net_device *lowerdev = vlan->lowerdev;
564 int err;
565
566 if (vlan->port->passthru) {
567 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
568 err = dev_set_promiscuity(lowerdev, 1);
569 if (err < 0)
570 goto out;
571 }
572 goto hash_add;
573 }
574
575 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
576 dev->rtnl_link_ops == &macvlan_link_ops) {
577 vlan->fwd_priv =
578 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
579
580 /* If we get a NULL pointer back, or if we get an error
581 * then we should just fall through to the non accelerated path
582 */
583 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
584 vlan->fwd_priv = NULL;
585 } else
586 return 0;
587 }
588
589 err = -EBUSY;
590 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
591 goto out;
592
593 err = dev_uc_add(lowerdev, dev->dev_addr);
594 if (err < 0)
595 goto out;
596 if (dev->flags & IFF_ALLMULTI) {
597 err = dev_set_allmulti(lowerdev, 1);
598 if (err < 0)
599 goto del_unicast;
600 }
601
602 hash_add:
603 macvlan_hash_add(vlan);
604 return 0;
605
606 del_unicast:
607 dev_uc_del(lowerdev, dev->dev_addr);
608 out:
609 if (vlan->fwd_priv) {
610 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
611 vlan->fwd_priv);
612 vlan->fwd_priv = NULL;
613 }
614 return err;
615 }
616
617 static int macvlan_stop(struct net_device *dev)
618 {
619 struct macvlan_dev *vlan = netdev_priv(dev);
620 struct net_device *lowerdev = vlan->lowerdev;
621
622 if (vlan->fwd_priv) {
623 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
624 vlan->fwd_priv);
625 vlan->fwd_priv = NULL;
626 return 0;
627 }
628
629 dev_uc_unsync(lowerdev, dev);
630 dev_mc_unsync(lowerdev, dev);
631
632 if (vlan->port->passthru) {
633 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
634 dev_set_promiscuity(lowerdev, -1);
635 goto hash_del;
636 }
637
638 if (dev->flags & IFF_ALLMULTI)
639 dev_set_allmulti(lowerdev, -1);
640
641 dev_uc_del(lowerdev, dev->dev_addr);
642
643 hash_del:
644 macvlan_hash_del(vlan, !dev->dismantle);
645 return 0;
646 }
647
648 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
649 {
650 struct macvlan_dev *vlan = netdev_priv(dev);
651 struct net_device *lowerdev = vlan->lowerdev;
652 int err;
653
654 if (!(dev->flags & IFF_UP)) {
655 /* Just copy in the new address */
656 ether_addr_copy(dev->dev_addr, addr);
657 } else {
658 /* Rehash and update the device filters */
659 if (macvlan_addr_busy(vlan->port, addr))
660 return -EBUSY;
661
662 if (!vlan->port->passthru) {
663 err = dev_uc_add(lowerdev, addr);
664 if (err)
665 return err;
666
667 dev_uc_del(lowerdev, dev->dev_addr);
668 }
669
670 macvlan_hash_change_addr(vlan, addr);
671 }
672 return 0;
673 }
674
675 static int macvlan_set_mac_address(struct net_device *dev, void *p)
676 {
677 struct macvlan_dev *vlan = netdev_priv(dev);
678 struct sockaddr *addr = p;
679
680 if (!is_valid_ether_addr(addr->sa_data))
681 return -EADDRNOTAVAIL;
682
683 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
684 dev_set_mac_address(vlan->lowerdev, addr);
685 return 0;
686 }
687
688 return macvlan_sync_address(dev, addr->sa_data);
689 }
690
691 static void macvlan_change_rx_flags(struct net_device *dev, int change)
692 {
693 struct macvlan_dev *vlan = netdev_priv(dev);
694 struct net_device *lowerdev = vlan->lowerdev;
695
696 if (dev->flags & IFF_UP) {
697 if (change & IFF_ALLMULTI)
698 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
699 }
700 }
701
702 static void macvlan_set_mac_lists(struct net_device *dev)
703 {
704 struct macvlan_dev *vlan = netdev_priv(dev);
705
706 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
707 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
708 } else {
709 struct netdev_hw_addr *ha;
710 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
711
712 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
713 netdev_for_each_mc_addr(ha, dev) {
714 __set_bit(mc_hash(vlan, ha->addr), filter);
715 }
716
717 __set_bit(mc_hash(vlan, dev->broadcast), filter);
718
719 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
720 }
721 dev_uc_sync(vlan->lowerdev, dev);
722 dev_mc_sync(vlan->lowerdev, dev);
723 }
724
725 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
726 {
727 struct macvlan_dev *vlan = netdev_priv(dev);
728
729 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
730 return -EINVAL;
731 dev->mtu = new_mtu;
732 return 0;
733 }
734
735 /*
736 * macvlan network devices have devices nesting below it and are a special
737 * "super class" of normal network devices; split their locks off into a
738 * separate class since they always nest.
739 */
740 static struct lock_class_key macvlan_netdev_xmit_lock_key;
741 static struct lock_class_key macvlan_netdev_addr_lock_key;
742
743 #define ALWAYS_ON_FEATURES \
744 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
745 NETIF_F_GSO_ROBUST)
746
747 #define MACVLAN_FEATURES \
748 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
749 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
750 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
751 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
752
753 #define MACVLAN_STATE_MASK \
754 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
755
756 static int macvlan_get_nest_level(struct net_device *dev)
757 {
758 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
759 }
760
761 static void macvlan_set_lockdep_class_one(struct net_device *dev,
762 struct netdev_queue *txq,
763 void *_unused)
764 {
765 lockdep_set_class(&txq->_xmit_lock,
766 &macvlan_netdev_xmit_lock_key);
767 }
768
769 static void macvlan_set_lockdep_class(struct net_device *dev)
770 {
771 lockdep_set_class_and_subclass(&dev->addr_list_lock,
772 &macvlan_netdev_addr_lock_key,
773 macvlan_get_nest_level(dev));
774 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
775 }
776
777 static int macvlan_init(struct net_device *dev)
778 {
779 struct macvlan_dev *vlan = netdev_priv(dev);
780 const struct net_device *lowerdev = vlan->lowerdev;
781
782 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
783 (lowerdev->state & MACVLAN_STATE_MASK);
784 dev->features = lowerdev->features & MACVLAN_FEATURES;
785 dev->features |= ALWAYS_ON_FEATURES;
786 dev->hw_features |= NETIF_F_LRO;
787 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
788 dev->gso_max_size = lowerdev->gso_max_size;
789 dev->iflink = lowerdev->ifindex;
790 dev->hard_header_len = lowerdev->hard_header_len;
791
792 macvlan_set_lockdep_class(dev);
793
794 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
795 if (!vlan->pcpu_stats)
796 return -ENOMEM;
797
798 return 0;
799 }
800
801 static void macvlan_uninit(struct net_device *dev)
802 {
803 struct macvlan_dev *vlan = netdev_priv(dev);
804 struct macvlan_port *port = vlan->port;
805
806 free_percpu(vlan->pcpu_stats);
807
808 macvlan_flush_sources(port, vlan);
809 port->count -= 1;
810 if (!port->count)
811 macvlan_port_destroy(port->dev);
812 }
813
814 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
815 struct rtnl_link_stats64 *stats)
816 {
817 struct macvlan_dev *vlan = netdev_priv(dev);
818
819 if (vlan->pcpu_stats) {
820 struct vlan_pcpu_stats *p;
821 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
822 u32 rx_errors = 0, tx_dropped = 0;
823 unsigned int start;
824 int i;
825
826 for_each_possible_cpu(i) {
827 p = per_cpu_ptr(vlan->pcpu_stats, i);
828 do {
829 start = u64_stats_fetch_begin_irq(&p->syncp);
830 rx_packets = p->rx_packets;
831 rx_bytes = p->rx_bytes;
832 rx_multicast = p->rx_multicast;
833 tx_packets = p->tx_packets;
834 tx_bytes = p->tx_bytes;
835 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
836
837 stats->rx_packets += rx_packets;
838 stats->rx_bytes += rx_bytes;
839 stats->multicast += rx_multicast;
840 stats->tx_packets += tx_packets;
841 stats->tx_bytes += tx_bytes;
842 /* rx_errors & tx_dropped are u32, updated
843 * without syncp protection.
844 */
845 rx_errors += p->rx_errors;
846 tx_dropped += p->tx_dropped;
847 }
848 stats->rx_errors = rx_errors;
849 stats->rx_dropped = rx_errors;
850 stats->tx_dropped = tx_dropped;
851 }
852 return stats;
853 }
854
855 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
856 __be16 proto, u16 vid)
857 {
858 struct macvlan_dev *vlan = netdev_priv(dev);
859 struct net_device *lowerdev = vlan->lowerdev;
860
861 return vlan_vid_add(lowerdev, proto, vid);
862 }
863
864 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
865 __be16 proto, u16 vid)
866 {
867 struct macvlan_dev *vlan = netdev_priv(dev);
868 struct net_device *lowerdev = vlan->lowerdev;
869
870 vlan_vid_del(lowerdev, proto, vid);
871 return 0;
872 }
873
874 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
875 struct net_device *dev,
876 const unsigned char *addr, u16 vid,
877 u16 flags)
878 {
879 struct macvlan_dev *vlan = netdev_priv(dev);
880 int err = -EINVAL;
881
882 /* Support unicast filter only on passthru devices.
883 * Multicast filter should be allowed on all devices.
884 */
885 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
886 return -EOPNOTSUPP;
887
888 if (flags & NLM_F_REPLACE)
889 return -EOPNOTSUPP;
890
891 if (is_unicast_ether_addr(addr))
892 err = dev_uc_add_excl(dev, addr);
893 else if (is_multicast_ether_addr(addr))
894 err = dev_mc_add_excl(dev, addr);
895
896 return err;
897 }
898
899 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
900 struct net_device *dev,
901 const unsigned char *addr, u16 vid)
902 {
903 struct macvlan_dev *vlan = netdev_priv(dev);
904 int err = -EINVAL;
905
906 /* Support unicast filter only on passthru devices.
907 * Multicast filter should be allowed on all devices.
908 */
909 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
910 return -EOPNOTSUPP;
911
912 if (is_unicast_ether_addr(addr))
913 err = dev_uc_del(dev, addr);
914 else if (is_multicast_ether_addr(addr))
915 err = dev_mc_del(dev, addr);
916
917 return err;
918 }
919
920 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
921 struct ethtool_drvinfo *drvinfo)
922 {
923 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
924 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
925 }
926
927 static int macvlan_ethtool_get_settings(struct net_device *dev,
928 struct ethtool_cmd *cmd)
929 {
930 const struct macvlan_dev *vlan = netdev_priv(dev);
931
932 return __ethtool_get_settings(vlan->lowerdev, cmd);
933 }
934
935 static netdev_features_t macvlan_fix_features(struct net_device *dev,
936 netdev_features_t features)
937 {
938 struct macvlan_dev *vlan = netdev_priv(dev);
939 netdev_features_t lowerdev_features = vlan->lowerdev->features;
940 netdev_features_t mask;
941
942 features |= NETIF_F_ALL_FOR_ALL;
943 features &= (vlan->set_features | ~MACVLAN_FEATURES);
944 mask = features;
945
946 lowerdev_features &= (features | ~NETIF_F_LRO);
947 features = netdev_increment_features(lowerdev_features, features, mask);
948 features |= ALWAYS_ON_FEATURES;
949 features &= ~NETIF_F_NETNS_LOCAL;
950
951 return features;
952 }
953
954 #ifdef CONFIG_NET_POLL_CONTROLLER
955 static void macvlan_dev_poll_controller(struct net_device *dev)
956 {
957 return;
958 }
959
960 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
961 {
962 struct macvlan_dev *vlan = netdev_priv(dev);
963 struct net_device *real_dev = vlan->lowerdev;
964 struct netpoll *netpoll;
965 int err = 0;
966
967 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
968 err = -ENOMEM;
969 if (!netpoll)
970 goto out;
971
972 err = __netpoll_setup(netpoll, real_dev);
973 if (err) {
974 kfree(netpoll);
975 goto out;
976 }
977
978 vlan->netpoll = netpoll;
979
980 out:
981 return err;
982 }
983
984 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
985 {
986 struct macvlan_dev *vlan = netdev_priv(dev);
987 struct netpoll *netpoll = vlan->netpoll;
988
989 if (!netpoll)
990 return;
991
992 vlan->netpoll = NULL;
993
994 __netpoll_free_async(netpoll);
995 }
996 #endif /* CONFIG_NET_POLL_CONTROLLER */
997
998 static const struct ethtool_ops macvlan_ethtool_ops = {
999 .get_link = ethtool_op_get_link,
1000 .get_settings = macvlan_ethtool_get_settings,
1001 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1002 };
1003
1004 static const struct net_device_ops macvlan_netdev_ops = {
1005 .ndo_init = macvlan_init,
1006 .ndo_uninit = macvlan_uninit,
1007 .ndo_open = macvlan_open,
1008 .ndo_stop = macvlan_stop,
1009 .ndo_start_xmit = macvlan_start_xmit,
1010 .ndo_change_mtu = macvlan_change_mtu,
1011 .ndo_fix_features = macvlan_fix_features,
1012 .ndo_change_rx_flags = macvlan_change_rx_flags,
1013 .ndo_set_mac_address = macvlan_set_mac_address,
1014 .ndo_set_rx_mode = macvlan_set_mac_lists,
1015 .ndo_get_stats64 = macvlan_dev_get_stats64,
1016 .ndo_validate_addr = eth_validate_addr,
1017 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1018 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1019 .ndo_fdb_add = macvlan_fdb_add,
1020 .ndo_fdb_del = macvlan_fdb_del,
1021 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1022 .ndo_get_lock_subclass = macvlan_get_nest_level,
1023 #ifdef CONFIG_NET_POLL_CONTROLLER
1024 .ndo_poll_controller = macvlan_dev_poll_controller,
1025 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1026 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1027 #endif
1028 };
1029
1030 void macvlan_common_setup(struct net_device *dev)
1031 {
1032 ether_setup(dev);
1033
1034 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1035 netif_keep_dst(dev);
1036 dev->priv_flags |= IFF_UNICAST_FLT;
1037 dev->netdev_ops = &macvlan_netdev_ops;
1038 dev->destructor = free_netdev;
1039 dev->header_ops = &macvlan_hard_header_ops;
1040 dev->ethtool_ops = &macvlan_ethtool_ops;
1041 }
1042 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1043
1044 static void macvlan_setup(struct net_device *dev)
1045 {
1046 macvlan_common_setup(dev);
1047 dev->tx_queue_len = 0;
1048 }
1049
1050 static int macvlan_port_create(struct net_device *dev)
1051 {
1052 struct macvlan_port *port;
1053 unsigned int i;
1054 int err;
1055
1056 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1057 return -EINVAL;
1058
1059 if (netif_is_ipvlan_port(dev))
1060 return -EBUSY;
1061
1062 port = kzalloc(sizeof(*port), GFP_KERNEL);
1063 if (port == NULL)
1064 return -ENOMEM;
1065
1066 port->passthru = false;
1067 port->dev = dev;
1068 INIT_LIST_HEAD(&port->vlans);
1069 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1070 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1071 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1072 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1073
1074 skb_queue_head_init(&port->bc_queue);
1075 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1076
1077 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1078 if (err)
1079 kfree(port);
1080 else
1081 dev->priv_flags |= IFF_MACVLAN_PORT;
1082 return err;
1083 }
1084
1085 static void macvlan_port_destroy(struct net_device *dev)
1086 {
1087 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1088
1089 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1090 netdev_rx_handler_unregister(dev);
1091
1092 /* After this point, no packet can schedule bc_work anymore,
1093 * but we need to cancel it and purge left skbs if any.
1094 */
1095 cancel_work_sync(&port->bc_work);
1096 __skb_queue_purge(&port->bc_queue);
1097
1098 kfree_rcu(port, rcu);
1099 }
1100
1101 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1102 {
1103 if (tb[IFLA_ADDRESS]) {
1104 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1105 return -EINVAL;
1106 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1107 return -EADDRNOTAVAIL;
1108 }
1109
1110 if (data && data[IFLA_MACVLAN_FLAGS] &&
1111 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1112 return -EINVAL;
1113
1114 if (data && data[IFLA_MACVLAN_MODE]) {
1115 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1116 case MACVLAN_MODE_PRIVATE:
1117 case MACVLAN_MODE_VEPA:
1118 case MACVLAN_MODE_BRIDGE:
1119 case MACVLAN_MODE_PASSTHRU:
1120 case MACVLAN_MODE_SOURCE:
1121 break;
1122 default:
1123 return -EINVAL;
1124 }
1125 }
1126
1127 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1128 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1129 case MACVLAN_MACADDR_ADD:
1130 case MACVLAN_MACADDR_DEL:
1131 case MACVLAN_MACADDR_FLUSH:
1132 case MACVLAN_MACADDR_SET:
1133 break;
1134 default:
1135 return -EINVAL;
1136 }
1137 }
1138
1139 if (data && data[IFLA_MACVLAN_MACADDR]) {
1140 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1141 return -EINVAL;
1142
1143 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1144 return -EADDRNOTAVAIL;
1145 }
1146
1147 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1148 return -EINVAL;
1149
1150 return 0;
1151 }
1152
1153 /**
1154 * reconfigure list of remote source mac address
1155 * (only for macvlan devices in source mode)
1156 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1157 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1158 */
1159 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1160 struct nlattr *data[])
1161 {
1162 char *addr = NULL;
1163 int ret, rem, len;
1164 struct nlattr *nla, *head;
1165 struct macvlan_source_entry *entry;
1166
1167 if (data[IFLA_MACVLAN_MACADDR])
1168 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1169
1170 if (mode == MACVLAN_MACADDR_ADD) {
1171 if (!addr)
1172 return -EINVAL;
1173
1174 return macvlan_hash_add_source(vlan, addr);
1175
1176 } else if (mode == MACVLAN_MACADDR_DEL) {
1177 if (!addr)
1178 return -EINVAL;
1179
1180 entry = macvlan_hash_lookup_source(vlan, addr);
1181 if (entry) {
1182 macvlan_hash_del_source(entry);
1183 vlan->macaddr_count--;
1184 }
1185 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1186 macvlan_flush_sources(vlan->port, vlan);
1187 } else if (mode == MACVLAN_MACADDR_SET) {
1188 macvlan_flush_sources(vlan->port, vlan);
1189
1190 if (addr) {
1191 ret = macvlan_hash_add_source(vlan, addr);
1192 if (ret)
1193 return ret;
1194 }
1195
1196 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1197 return 0;
1198
1199 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1200 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1201
1202 nla_for_each_attr(nla, head, len, rem) {
1203 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1204 nla_len(nla) != ETH_ALEN)
1205 continue;
1206
1207 addr = nla_data(nla);
1208 ret = macvlan_hash_add_source(vlan, addr);
1209 if (ret)
1210 return ret;
1211 }
1212 } else {
1213 return -EINVAL;
1214 }
1215
1216 return 0;
1217 }
1218
1219 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1220 struct nlattr *tb[], struct nlattr *data[])
1221 {
1222 struct macvlan_dev *vlan = netdev_priv(dev);
1223 struct macvlan_port *port;
1224 struct net_device *lowerdev;
1225 int err;
1226 int macmode;
1227
1228 if (!tb[IFLA_LINK])
1229 return -EINVAL;
1230
1231 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1232 if (lowerdev == NULL)
1233 return -ENODEV;
1234
1235 /* When creating macvlans or macvtaps on top of other macvlans - use
1236 * the real device as the lowerdev.
1237 */
1238 if (netif_is_macvlan(lowerdev))
1239 lowerdev = macvlan_dev_real_dev(lowerdev);
1240
1241 if (!tb[IFLA_MTU])
1242 dev->mtu = lowerdev->mtu;
1243 else if (dev->mtu > lowerdev->mtu)
1244 return -EINVAL;
1245
1246 if (!tb[IFLA_ADDRESS])
1247 eth_hw_addr_random(dev);
1248
1249 if (!macvlan_port_exists(lowerdev)) {
1250 err = macvlan_port_create(lowerdev);
1251 if (err < 0)
1252 return err;
1253 }
1254 port = macvlan_port_get_rtnl(lowerdev);
1255
1256 /* Only 1 macvlan device can be created in passthru mode */
1257 if (port->passthru)
1258 return -EINVAL;
1259
1260 vlan->lowerdev = lowerdev;
1261 vlan->dev = dev;
1262 vlan->port = port;
1263 vlan->set_features = MACVLAN_FEATURES;
1264 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1265
1266 vlan->mode = MACVLAN_MODE_VEPA;
1267 if (data && data[IFLA_MACVLAN_MODE])
1268 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1269
1270 if (data && data[IFLA_MACVLAN_FLAGS])
1271 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1272
1273 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1274 if (port->count)
1275 return -EINVAL;
1276 port->passthru = true;
1277 eth_hw_addr_inherit(dev, lowerdev);
1278 }
1279
1280 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1281 if (vlan->mode != MACVLAN_MODE_SOURCE)
1282 return -EINVAL;
1283 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1284 err = macvlan_changelink_sources(vlan, macmode, data);
1285 if (err)
1286 return err;
1287 }
1288
1289 port->count += 1;
1290 err = register_netdevice(dev);
1291 if (err < 0)
1292 goto destroy_port;
1293
1294 dev->priv_flags |= IFF_MACVLAN;
1295 err = netdev_upper_dev_link(lowerdev, dev);
1296 if (err)
1297 goto unregister_netdev;
1298
1299 list_add_tail_rcu(&vlan->list, &port->vlans);
1300 netif_stacked_transfer_operstate(lowerdev, dev);
1301
1302 return 0;
1303
1304 unregister_netdev:
1305 unregister_netdevice(dev);
1306 destroy_port:
1307 port->count -= 1;
1308 if (!port->count)
1309 macvlan_port_destroy(lowerdev);
1310
1311 return err;
1312 }
1313 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1314
1315 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1316 struct nlattr *tb[], struct nlattr *data[])
1317 {
1318 return macvlan_common_newlink(src_net, dev, tb, data);
1319 }
1320
1321 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1322 {
1323 struct macvlan_dev *vlan = netdev_priv(dev);
1324
1325 if (vlan->mode == MACVLAN_MODE_SOURCE)
1326 macvlan_flush_sources(vlan->port, vlan);
1327 list_del_rcu(&vlan->list);
1328 unregister_netdevice_queue(dev, head);
1329 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1330 }
1331 EXPORT_SYMBOL_GPL(macvlan_dellink);
1332
1333 static int macvlan_changelink(struct net_device *dev,
1334 struct nlattr *tb[], struct nlattr *data[])
1335 {
1336 struct macvlan_dev *vlan = netdev_priv(dev);
1337 enum macvlan_mode mode;
1338 bool set_mode = false;
1339 enum macvlan_macaddr_mode macmode;
1340 int ret;
1341
1342 /* Validate mode, but don't set yet: setting flags may fail. */
1343 if (data && data[IFLA_MACVLAN_MODE]) {
1344 set_mode = true;
1345 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1346 /* Passthrough mode can't be set or cleared dynamically */
1347 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1348 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1349 return -EINVAL;
1350 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1351 vlan->mode != mode)
1352 macvlan_flush_sources(vlan->port, vlan);
1353 }
1354
1355 if (data && data[IFLA_MACVLAN_FLAGS]) {
1356 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1357 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1358 if (vlan->port->passthru && promisc) {
1359 int err;
1360
1361 if (flags & MACVLAN_FLAG_NOPROMISC)
1362 err = dev_set_promiscuity(vlan->lowerdev, -1);
1363 else
1364 err = dev_set_promiscuity(vlan->lowerdev, 1);
1365 if (err < 0)
1366 return err;
1367 }
1368 vlan->flags = flags;
1369 }
1370 if (set_mode)
1371 vlan->mode = mode;
1372 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1373 if (vlan->mode != MACVLAN_MODE_SOURCE)
1374 return -EINVAL;
1375 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1376 ret = macvlan_changelink_sources(vlan, macmode, data);
1377 if (ret)
1378 return ret;
1379 }
1380 return 0;
1381 }
1382
1383 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1384 {
1385 if (vlan->macaddr_count == 0)
1386 return 0;
1387 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1388 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1389 }
1390
1391 static size_t macvlan_get_size(const struct net_device *dev)
1392 {
1393 struct macvlan_dev *vlan = netdev_priv(dev);
1394
1395 return (0
1396 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1397 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1398 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1399 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1400 );
1401 }
1402
1403 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1404 const struct macvlan_dev *vlan,
1405 const int i)
1406 {
1407 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1408 struct macvlan_source_entry *entry;
1409
1410 hlist_for_each_entry_rcu(entry, h, hlist) {
1411 if (entry->vlan != vlan)
1412 continue;
1413 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1414 return 1;
1415 }
1416 return 0;
1417 }
1418
1419 static int macvlan_fill_info(struct sk_buff *skb,
1420 const struct net_device *dev)
1421 {
1422 struct macvlan_dev *vlan = netdev_priv(dev);
1423 int i;
1424 struct nlattr *nest;
1425
1426 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1427 goto nla_put_failure;
1428 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1429 goto nla_put_failure;
1430 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1431 goto nla_put_failure;
1432 if (vlan->macaddr_count > 0) {
1433 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1434 if (nest == NULL)
1435 goto nla_put_failure;
1436
1437 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1438 if (macvlan_fill_info_macaddr(skb, vlan, i))
1439 goto nla_put_failure;
1440 }
1441 nla_nest_end(skb, nest);
1442 }
1443 return 0;
1444
1445 nla_put_failure:
1446 return -EMSGSIZE;
1447 }
1448
1449 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1450 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1451 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1452 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1453 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1454 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1455 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1456 };
1457
1458 int macvlan_link_register(struct rtnl_link_ops *ops)
1459 {
1460 /* common fields */
1461 ops->priv_size = sizeof(struct macvlan_dev);
1462 ops->validate = macvlan_validate;
1463 ops->maxtype = IFLA_MACVLAN_MAX;
1464 ops->policy = macvlan_policy;
1465 ops->changelink = macvlan_changelink;
1466 ops->get_size = macvlan_get_size;
1467 ops->fill_info = macvlan_fill_info;
1468
1469 return rtnl_link_register(ops);
1470 };
1471 EXPORT_SYMBOL_GPL(macvlan_link_register);
1472
1473 static struct net *macvlan_get_link_net(const struct net_device *dev)
1474 {
1475 return dev_net(macvlan_dev_real_dev(dev));
1476 }
1477
1478 static struct rtnl_link_ops macvlan_link_ops = {
1479 .kind = "macvlan",
1480 .setup = macvlan_setup,
1481 .newlink = macvlan_newlink,
1482 .dellink = macvlan_dellink,
1483 .get_link_net = macvlan_get_link_net,
1484 };
1485
1486 static int macvlan_device_event(struct notifier_block *unused,
1487 unsigned long event, void *ptr)
1488 {
1489 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1490 struct macvlan_dev *vlan, *next;
1491 struct macvlan_port *port;
1492 LIST_HEAD(list_kill);
1493
1494 if (!macvlan_port_exists(dev))
1495 return NOTIFY_DONE;
1496
1497 port = macvlan_port_get_rtnl(dev);
1498
1499 switch (event) {
1500 case NETDEV_CHANGE:
1501 list_for_each_entry(vlan, &port->vlans, list)
1502 netif_stacked_transfer_operstate(vlan->lowerdev,
1503 vlan->dev);
1504 break;
1505 case NETDEV_FEAT_CHANGE:
1506 list_for_each_entry(vlan, &port->vlans, list) {
1507 vlan->dev->gso_max_size = dev->gso_max_size;
1508 netdev_update_features(vlan->dev);
1509 }
1510 break;
1511 case NETDEV_CHANGEMTU:
1512 list_for_each_entry(vlan, &port->vlans, list) {
1513 if (vlan->dev->mtu <= dev->mtu)
1514 continue;
1515 dev_set_mtu(vlan->dev, dev->mtu);
1516 }
1517 break;
1518 case NETDEV_CHANGEADDR:
1519 if (!port->passthru)
1520 return NOTIFY_DONE;
1521
1522 vlan = list_first_entry_or_null(&port->vlans,
1523 struct macvlan_dev,
1524 list);
1525
1526 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1527 return NOTIFY_BAD;
1528
1529 break;
1530 case NETDEV_UNREGISTER:
1531 /* twiddle thumbs on netns device moves */
1532 if (dev->reg_state != NETREG_UNREGISTERING)
1533 break;
1534
1535 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1536 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1537 unregister_netdevice_many(&list_kill);
1538 break;
1539 case NETDEV_PRE_TYPE_CHANGE:
1540 /* Forbid underlaying device to change its type. */
1541 return NOTIFY_BAD;
1542
1543 case NETDEV_NOTIFY_PEERS:
1544 case NETDEV_BONDING_FAILOVER:
1545 case NETDEV_RESEND_IGMP:
1546 /* Propagate to all vlans */
1547 list_for_each_entry(vlan, &port->vlans, list)
1548 call_netdevice_notifiers(event, vlan->dev);
1549 }
1550 return NOTIFY_DONE;
1551 }
1552
1553 static struct notifier_block macvlan_notifier_block __read_mostly = {
1554 .notifier_call = macvlan_device_event,
1555 };
1556
1557 static int __init macvlan_init_module(void)
1558 {
1559 int err;
1560
1561 register_netdevice_notifier(&macvlan_notifier_block);
1562
1563 err = macvlan_link_register(&macvlan_link_ops);
1564 if (err < 0)
1565 goto err1;
1566 return 0;
1567 err1:
1568 unregister_netdevice_notifier(&macvlan_notifier_block);
1569 return err;
1570 }
1571
1572 static void __exit macvlan_cleanup_module(void)
1573 {
1574 rtnl_link_unregister(&macvlan_link_ops);
1575 unregister_netdevice_notifier(&macvlan_notifier_block);
1576 }
1577
1578 module_init(macvlan_init_module);
1579 module_exit(macvlan_cleanup_module);
1580
1581 MODULE_LICENSE("GPL");
1582 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1583 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1584 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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