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mpls_iptunnel: fix sparse warn: remove incorrect rcu_dereference
[linux/fpc-iii.git] / drivers / net / macvlan.c
blob9f59f17dc317a254641bdc48973ce78e089761bc
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 if (dev->flags & IFF_PROMISC) {
603 err = dev_set_promiscuity(lowerdev, 1);
604 if (err < 0)
605 goto clear_multi;
606 }
607
608 hash_add:
609 macvlan_hash_add(vlan);
610 return 0;
611
612 clear_multi:
613 dev_set_allmulti(lowerdev, -1);
614 del_unicast:
615 dev_uc_del(lowerdev, dev->dev_addr);
616 out:
617 if (vlan->fwd_priv) {
618 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
619 vlan->fwd_priv);
620 vlan->fwd_priv = NULL;
621 }
622 return err;
623 }
624
625 static int macvlan_stop(struct net_device *dev)
626 {
627 struct macvlan_dev *vlan = netdev_priv(dev);
628 struct net_device *lowerdev = vlan->lowerdev;
629
630 if (vlan->fwd_priv) {
631 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
632 vlan->fwd_priv);
633 vlan->fwd_priv = NULL;
634 return 0;
635 }
636
637 dev_uc_unsync(lowerdev, dev);
638 dev_mc_unsync(lowerdev, dev);
639
640 if (vlan->port->passthru) {
641 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
642 dev_set_promiscuity(lowerdev, -1);
643 goto hash_del;
644 }
645
646 if (dev->flags & IFF_ALLMULTI)
647 dev_set_allmulti(lowerdev, -1);
648
649 if (dev->flags & IFF_PROMISC)
650 dev_set_promiscuity(lowerdev, -1);
651
652 dev_uc_del(lowerdev, dev->dev_addr);
653
654 hash_del:
655 macvlan_hash_del(vlan, !dev->dismantle);
656 return 0;
657 }
658
659 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
660 {
661 struct macvlan_dev *vlan = netdev_priv(dev);
662 struct net_device *lowerdev = vlan->lowerdev;
663 int err;
664
665 if (!(dev->flags & IFF_UP)) {
666 /* Just copy in the new address */
667 ether_addr_copy(dev->dev_addr, addr);
668 } else {
669 /* Rehash and update the device filters */
670 if (macvlan_addr_busy(vlan->port, addr))
671 return -EBUSY;
672
673 if (!vlan->port->passthru) {
674 err = dev_uc_add(lowerdev, addr);
675 if (err)
676 return err;
677
678 dev_uc_del(lowerdev, dev->dev_addr);
679 }
680
681 macvlan_hash_change_addr(vlan, addr);
682 }
683 return 0;
684 }
685
686 static int macvlan_set_mac_address(struct net_device *dev, void *p)
687 {
688 struct macvlan_dev *vlan = netdev_priv(dev);
689 struct sockaddr *addr = p;
690
691 if (!is_valid_ether_addr(addr->sa_data))
692 return -EADDRNOTAVAIL;
693
694 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
695 dev_set_mac_address(vlan->lowerdev, addr);
696 return 0;
697 }
698
699 return macvlan_sync_address(dev, addr->sa_data);
700 }
701
702 static void macvlan_change_rx_flags(struct net_device *dev, int change)
703 {
704 struct macvlan_dev *vlan = netdev_priv(dev);
705 struct net_device *lowerdev = vlan->lowerdev;
706
707 if (dev->flags & IFF_UP) {
708 if (change & IFF_ALLMULTI)
709 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
710 if (change & IFF_PROMISC)
711 dev_set_promiscuity(lowerdev,
712 dev->flags & IFF_PROMISC ? 1 : -1);
713
714 }
715 }
716
717 static void macvlan_set_mac_lists(struct net_device *dev)
718 {
719 struct macvlan_dev *vlan = netdev_priv(dev);
720
721 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
722 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
723 } else {
724 struct netdev_hw_addr *ha;
725 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
726
727 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
728 netdev_for_each_mc_addr(ha, dev) {
729 __set_bit(mc_hash(vlan, ha->addr), filter);
730 }
731
732 __set_bit(mc_hash(vlan, dev->broadcast), filter);
733
734 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
735 }
736 dev_uc_sync(vlan->lowerdev, dev);
737 dev_mc_sync(vlan->lowerdev, dev);
738 }
739
740 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
741 {
742 struct macvlan_dev *vlan = netdev_priv(dev);
743
744 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
745 return -EINVAL;
746 dev->mtu = new_mtu;
747 return 0;
748 }
749
750 /*
751 * macvlan network devices have devices nesting below it and are a special
752 * "super class" of normal network devices; split their locks off into a
753 * separate class since they always nest.
754 */
755 static struct lock_class_key macvlan_netdev_xmit_lock_key;
756 static struct lock_class_key macvlan_netdev_addr_lock_key;
757
758 #define ALWAYS_ON_FEATURES \
759 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
760 NETIF_F_GSO_ROBUST)
761
762 #define MACVLAN_FEATURES \
763 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
764 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
765 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
766 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
767
768 #define MACVLAN_STATE_MASK \
769 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
770
771 static int macvlan_get_nest_level(struct net_device *dev)
772 {
773 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
774 }
775
776 static void macvlan_set_lockdep_class_one(struct net_device *dev,
777 struct netdev_queue *txq,
778 void *_unused)
779 {
780 lockdep_set_class(&txq->_xmit_lock,
781 &macvlan_netdev_xmit_lock_key);
782 }
783
784 static void macvlan_set_lockdep_class(struct net_device *dev)
785 {
786 lockdep_set_class_and_subclass(&dev->addr_list_lock,
787 &macvlan_netdev_addr_lock_key,
788 macvlan_get_nest_level(dev));
789 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
790 }
791
792 static int macvlan_init(struct net_device *dev)
793 {
794 struct macvlan_dev *vlan = netdev_priv(dev);
795 const struct net_device *lowerdev = vlan->lowerdev;
796
797 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
798 (lowerdev->state & MACVLAN_STATE_MASK);
799 dev->features = lowerdev->features & MACVLAN_FEATURES;
800 dev->features |= ALWAYS_ON_FEATURES;
801 dev->hw_features |= NETIF_F_LRO;
802 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
803 dev->gso_max_size = lowerdev->gso_max_size;
804 dev->hard_header_len = lowerdev->hard_header_len;
805
806 macvlan_set_lockdep_class(dev);
807
808 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
809 if (!vlan->pcpu_stats)
810 return -ENOMEM;
811
812 return 0;
813 }
814
815 static void macvlan_uninit(struct net_device *dev)
816 {
817 struct macvlan_dev *vlan = netdev_priv(dev);
818 struct macvlan_port *port = vlan->port;
819
820 free_percpu(vlan->pcpu_stats);
821
822 macvlan_flush_sources(port, vlan);
823 port->count -= 1;
824 if (!port->count)
825 macvlan_port_destroy(port->dev);
826 }
827
828 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
829 struct rtnl_link_stats64 *stats)
830 {
831 struct macvlan_dev *vlan = netdev_priv(dev);
832
833 if (vlan->pcpu_stats) {
834 struct vlan_pcpu_stats *p;
835 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
836 u32 rx_errors = 0, tx_dropped = 0;
837 unsigned int start;
838 int i;
839
840 for_each_possible_cpu(i) {
841 p = per_cpu_ptr(vlan->pcpu_stats, i);
842 do {
843 start = u64_stats_fetch_begin_irq(&p->syncp);
844 rx_packets = p->rx_packets;
845 rx_bytes = p->rx_bytes;
846 rx_multicast = p->rx_multicast;
847 tx_packets = p->tx_packets;
848 tx_bytes = p->tx_bytes;
849 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
850
851 stats->rx_packets += rx_packets;
852 stats->rx_bytes += rx_bytes;
853 stats->multicast += rx_multicast;
854 stats->tx_packets += tx_packets;
855 stats->tx_bytes += tx_bytes;
856 /* rx_errors & tx_dropped are u32, updated
857 * without syncp protection.
858 */
859 rx_errors += p->rx_errors;
860 tx_dropped += p->tx_dropped;
861 }
862 stats->rx_errors = rx_errors;
863 stats->rx_dropped = rx_errors;
864 stats->tx_dropped = tx_dropped;
865 }
866 return stats;
867 }
868
869 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
870 __be16 proto, u16 vid)
871 {
872 struct macvlan_dev *vlan = netdev_priv(dev);
873 struct net_device *lowerdev = vlan->lowerdev;
874
875 return vlan_vid_add(lowerdev, proto, vid);
876 }
877
878 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
879 __be16 proto, u16 vid)
880 {
881 struct macvlan_dev *vlan = netdev_priv(dev);
882 struct net_device *lowerdev = vlan->lowerdev;
883
884 vlan_vid_del(lowerdev, proto, vid);
885 return 0;
886 }
887
888 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
889 struct net_device *dev,
890 const unsigned char *addr, u16 vid,
891 u16 flags)
892 {
893 struct macvlan_dev *vlan = netdev_priv(dev);
894 int err = -EINVAL;
895
896 /* Support unicast filter only on passthru devices.
897 * Multicast filter should be allowed on all devices.
898 */
899 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
900 return -EOPNOTSUPP;
901
902 if (flags & NLM_F_REPLACE)
903 return -EOPNOTSUPP;
904
905 if (is_unicast_ether_addr(addr))
906 err = dev_uc_add_excl(dev, addr);
907 else if (is_multicast_ether_addr(addr))
908 err = dev_mc_add_excl(dev, addr);
909
910 return err;
911 }
912
913 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
914 struct net_device *dev,
915 const unsigned char *addr, u16 vid)
916 {
917 struct macvlan_dev *vlan = netdev_priv(dev);
918 int err = -EINVAL;
919
920 /* Support unicast filter only on passthru devices.
921 * Multicast filter should be allowed on all devices.
922 */
923 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
924 return -EOPNOTSUPP;
925
926 if (is_unicast_ether_addr(addr))
927 err = dev_uc_del(dev, addr);
928 else if (is_multicast_ether_addr(addr))
929 err = dev_mc_del(dev, addr);
930
931 return err;
932 }
933
934 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
935 struct ethtool_drvinfo *drvinfo)
936 {
937 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
938 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
939 }
940
941 static int macvlan_ethtool_get_settings(struct net_device *dev,
942 struct ethtool_cmd *cmd)
943 {
944 const struct macvlan_dev *vlan = netdev_priv(dev);
945
946 return __ethtool_get_settings(vlan->lowerdev, cmd);
947 }
948
949 static netdev_features_t macvlan_fix_features(struct net_device *dev,
950 netdev_features_t features)
951 {
952 struct macvlan_dev *vlan = netdev_priv(dev);
953 netdev_features_t lowerdev_features = vlan->lowerdev->features;
954 netdev_features_t mask;
955
956 features |= NETIF_F_ALL_FOR_ALL;
957 features &= (vlan->set_features | ~MACVLAN_FEATURES);
958 mask = features;
959
960 lowerdev_features &= (features | ~NETIF_F_LRO);
961 features = netdev_increment_features(lowerdev_features, features, mask);
962 features |= ALWAYS_ON_FEATURES;
963 features &= ~NETIF_F_NETNS_LOCAL;
964
965 return features;
966 }
967
968 #ifdef CONFIG_NET_POLL_CONTROLLER
969 static void macvlan_dev_poll_controller(struct net_device *dev)
970 {
971 return;
972 }
973
974 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
975 {
976 struct macvlan_dev *vlan = netdev_priv(dev);
977 struct net_device *real_dev = vlan->lowerdev;
978 struct netpoll *netpoll;
979 int err = 0;
980
981 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
982 err = -ENOMEM;
983 if (!netpoll)
984 goto out;
985
986 err = __netpoll_setup(netpoll, real_dev);
987 if (err) {
988 kfree(netpoll);
989 goto out;
990 }
991
992 vlan->netpoll = netpoll;
993
994 out:
995 return err;
996 }
997
998 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
999 {
1000 struct macvlan_dev *vlan = netdev_priv(dev);
1001 struct netpoll *netpoll = vlan->netpoll;
1002
1003 if (!netpoll)
1004 return;
1005
1006 vlan->netpoll = NULL;
1007
1008 __netpoll_free_async(netpoll);
1009 }
1010 #endif /* CONFIG_NET_POLL_CONTROLLER */
1011
1012 static int macvlan_dev_get_iflink(const struct net_device *dev)
1013 {
1014 struct macvlan_dev *vlan = netdev_priv(dev);
1015
1016 return vlan->lowerdev->ifindex;
1017 }
1018
1019 static const struct ethtool_ops macvlan_ethtool_ops = {
1020 .get_link = ethtool_op_get_link,
1021 .get_settings = macvlan_ethtool_get_settings,
1022 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1023 };
1024
1025 static const struct net_device_ops macvlan_netdev_ops = {
1026 .ndo_init = macvlan_init,
1027 .ndo_uninit = macvlan_uninit,
1028 .ndo_open = macvlan_open,
1029 .ndo_stop = macvlan_stop,
1030 .ndo_start_xmit = macvlan_start_xmit,
1031 .ndo_change_mtu = macvlan_change_mtu,
1032 .ndo_fix_features = macvlan_fix_features,
1033 .ndo_change_rx_flags = macvlan_change_rx_flags,
1034 .ndo_set_mac_address = macvlan_set_mac_address,
1035 .ndo_set_rx_mode = macvlan_set_mac_lists,
1036 .ndo_get_stats64 = macvlan_dev_get_stats64,
1037 .ndo_validate_addr = eth_validate_addr,
1038 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1039 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1040 .ndo_fdb_add = macvlan_fdb_add,
1041 .ndo_fdb_del = macvlan_fdb_del,
1042 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1043 .ndo_get_lock_subclass = macvlan_get_nest_level,
1044 #ifdef CONFIG_NET_POLL_CONTROLLER
1045 .ndo_poll_controller = macvlan_dev_poll_controller,
1046 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1047 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1048 #endif
1049 .ndo_get_iflink = macvlan_dev_get_iflink,
1050 };
1051
1052 void macvlan_common_setup(struct net_device *dev)
1053 {
1054 ether_setup(dev);
1055
1056 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1057 netif_keep_dst(dev);
1058 dev->priv_flags |= IFF_UNICAST_FLT;
1059 dev->netdev_ops = &macvlan_netdev_ops;
1060 dev->destructor = free_netdev;
1061 dev->header_ops = &macvlan_hard_header_ops;
1062 dev->ethtool_ops = &macvlan_ethtool_ops;
1063 }
1064 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1065
1066 static void macvlan_setup(struct net_device *dev)
1067 {
1068 macvlan_common_setup(dev);
1069 dev->tx_queue_len = 0;
1070 }
1071
1072 static int macvlan_port_create(struct net_device *dev)
1073 {
1074 struct macvlan_port *port;
1075 unsigned int i;
1076 int err;
1077
1078 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1079 return -EINVAL;
1080
1081 if (netif_is_ipvlan_port(dev))
1082 return -EBUSY;
1083
1084 port = kzalloc(sizeof(*port), GFP_KERNEL);
1085 if (port == NULL)
1086 return -ENOMEM;
1087
1088 port->passthru = false;
1089 port->dev = dev;
1090 INIT_LIST_HEAD(&port->vlans);
1091 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1092 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1093 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1094 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1095
1096 skb_queue_head_init(&port->bc_queue);
1097 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1098
1099 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1100 if (err)
1101 kfree(port);
1102 else
1103 dev->priv_flags |= IFF_MACVLAN_PORT;
1104 return err;
1105 }
1106
1107 static void macvlan_port_destroy(struct net_device *dev)
1108 {
1109 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1110
1111 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1112 netdev_rx_handler_unregister(dev);
1113
1114 /* After this point, no packet can schedule bc_work anymore,
1115 * but we need to cancel it and purge left skbs if any.
1116 */
1117 cancel_work_sync(&port->bc_work);
1118 __skb_queue_purge(&port->bc_queue);
1119
1120 kfree_rcu(port, rcu);
1121 }
1122
1123 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1124 {
1125 if (tb[IFLA_ADDRESS]) {
1126 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1127 return -EINVAL;
1128 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1129 return -EADDRNOTAVAIL;
1130 }
1131
1132 if (data && data[IFLA_MACVLAN_FLAGS] &&
1133 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1134 return -EINVAL;
1135
1136 if (data && data[IFLA_MACVLAN_MODE]) {
1137 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1138 case MACVLAN_MODE_PRIVATE:
1139 case MACVLAN_MODE_VEPA:
1140 case MACVLAN_MODE_BRIDGE:
1141 case MACVLAN_MODE_PASSTHRU:
1142 case MACVLAN_MODE_SOURCE:
1143 break;
1144 default:
1145 return -EINVAL;
1146 }
1147 }
1148
1149 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1150 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1151 case MACVLAN_MACADDR_ADD:
1152 case MACVLAN_MACADDR_DEL:
1153 case MACVLAN_MACADDR_FLUSH:
1154 case MACVLAN_MACADDR_SET:
1155 break;
1156 default:
1157 return -EINVAL;
1158 }
1159 }
1160
1161 if (data && data[IFLA_MACVLAN_MACADDR]) {
1162 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1163 return -EINVAL;
1164
1165 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1166 return -EADDRNOTAVAIL;
1167 }
1168
1169 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1170 return -EINVAL;
1171
1172 return 0;
1173 }
1174
1175 /**
1176 * reconfigure list of remote source mac address
1177 * (only for macvlan devices in source mode)
1178 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1179 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1180 */
1181 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1182 struct nlattr *data[])
1183 {
1184 char *addr = NULL;
1185 int ret, rem, len;
1186 struct nlattr *nla, *head;
1187 struct macvlan_source_entry *entry;
1188
1189 if (data[IFLA_MACVLAN_MACADDR])
1190 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1191
1192 if (mode == MACVLAN_MACADDR_ADD) {
1193 if (!addr)
1194 return -EINVAL;
1195
1196 return macvlan_hash_add_source(vlan, addr);
1197
1198 } else if (mode == MACVLAN_MACADDR_DEL) {
1199 if (!addr)
1200 return -EINVAL;
1201
1202 entry = macvlan_hash_lookup_source(vlan, addr);
1203 if (entry) {
1204 macvlan_hash_del_source(entry);
1205 vlan->macaddr_count--;
1206 }
1207 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1208 macvlan_flush_sources(vlan->port, vlan);
1209 } else if (mode == MACVLAN_MACADDR_SET) {
1210 macvlan_flush_sources(vlan->port, vlan);
1211
1212 if (addr) {
1213 ret = macvlan_hash_add_source(vlan, addr);
1214 if (ret)
1215 return ret;
1216 }
1217
1218 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1219 return 0;
1220
1221 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1222 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1223
1224 nla_for_each_attr(nla, head, len, rem) {
1225 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1226 nla_len(nla) != ETH_ALEN)
1227 continue;
1228
1229 addr = nla_data(nla);
1230 ret = macvlan_hash_add_source(vlan, addr);
1231 if (ret)
1232 return ret;
1233 }
1234 } else {
1235 return -EINVAL;
1236 }
1237
1238 return 0;
1239 }
1240
1241 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1242 struct nlattr *tb[], struct nlattr *data[])
1243 {
1244 struct macvlan_dev *vlan = netdev_priv(dev);
1245 struct macvlan_port *port;
1246 struct net_device *lowerdev;
1247 int err;
1248 int macmode;
1249
1250 if (!tb[IFLA_LINK])
1251 return -EINVAL;
1252
1253 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1254 if (lowerdev == NULL)
1255 return -ENODEV;
1256
1257 /* When creating macvlans or macvtaps on top of other macvlans - use
1258 * the real device as the lowerdev.
1259 */
1260 if (netif_is_macvlan(lowerdev))
1261 lowerdev = macvlan_dev_real_dev(lowerdev);
1262
1263 if (!tb[IFLA_MTU])
1264 dev->mtu = lowerdev->mtu;
1265 else if (dev->mtu > lowerdev->mtu)
1266 return -EINVAL;
1267
1268 if (!tb[IFLA_ADDRESS])
1269 eth_hw_addr_random(dev);
1270
1271 if (!macvlan_port_exists(lowerdev)) {
1272 err = macvlan_port_create(lowerdev);
1273 if (err < 0)
1274 return err;
1275 }
1276 port = macvlan_port_get_rtnl(lowerdev);
1277
1278 /* Only 1 macvlan device can be created in passthru mode */
1279 if (port->passthru)
1280 return -EINVAL;
1281
1282 vlan->lowerdev = lowerdev;
1283 vlan->dev = dev;
1284 vlan->port = port;
1285 vlan->set_features = MACVLAN_FEATURES;
1286 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1287
1288 vlan->mode = MACVLAN_MODE_VEPA;
1289 if (data && data[IFLA_MACVLAN_MODE])
1290 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1291
1292 if (data && data[IFLA_MACVLAN_FLAGS])
1293 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1294
1295 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1296 if (port->count)
1297 return -EINVAL;
1298 port->passthru = true;
1299 eth_hw_addr_inherit(dev, lowerdev);
1300 }
1301
1302 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1303 if (vlan->mode != MACVLAN_MODE_SOURCE)
1304 return -EINVAL;
1305 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1306 err = macvlan_changelink_sources(vlan, macmode, data);
1307 if (err)
1308 return err;
1309 }
1310
1311 port->count += 1;
1312 err = register_netdevice(dev);
1313 if (err < 0)
1314 goto destroy_port;
1315
1316 dev->priv_flags |= IFF_MACVLAN;
1317 err = netdev_upper_dev_link(lowerdev, dev);
1318 if (err)
1319 goto unregister_netdev;
1320
1321 list_add_tail_rcu(&vlan->list, &port->vlans);
1322 netif_stacked_transfer_operstate(lowerdev, dev);
1323
1324 return 0;
1325
1326 unregister_netdev:
1327 unregister_netdevice(dev);
1328 destroy_port:
1329 port->count -= 1;
1330 if (!port->count)
1331 macvlan_port_destroy(lowerdev);
1332
1333 return err;
1334 }
1335 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1336
1337 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1338 struct nlattr *tb[], struct nlattr *data[])
1339 {
1340 return macvlan_common_newlink(src_net, dev, tb, data);
1341 }
1342
1343 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1344 {
1345 struct macvlan_dev *vlan = netdev_priv(dev);
1346
1347 if (vlan->mode == MACVLAN_MODE_SOURCE)
1348 macvlan_flush_sources(vlan->port, vlan);
1349 list_del_rcu(&vlan->list);
1350 unregister_netdevice_queue(dev, head);
1351 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1352 }
1353 EXPORT_SYMBOL_GPL(macvlan_dellink);
1354
1355 static int macvlan_changelink(struct net_device *dev,
1356 struct nlattr *tb[], struct nlattr *data[])
1357 {
1358 struct macvlan_dev *vlan = netdev_priv(dev);
1359 enum macvlan_mode mode;
1360 bool set_mode = false;
1361 enum macvlan_macaddr_mode macmode;
1362 int ret;
1363
1364 /* Validate mode, but don't set yet: setting flags may fail. */
1365 if (data && data[IFLA_MACVLAN_MODE]) {
1366 set_mode = true;
1367 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1368 /* Passthrough mode can't be set or cleared dynamically */
1369 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1370 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1371 return -EINVAL;
1372 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1373 vlan->mode != mode)
1374 macvlan_flush_sources(vlan->port, vlan);
1375 }
1376
1377 if (data && data[IFLA_MACVLAN_FLAGS]) {
1378 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1379 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1380 if (vlan->port->passthru && promisc) {
1381 int err;
1382
1383 if (flags & MACVLAN_FLAG_NOPROMISC)
1384 err = dev_set_promiscuity(vlan->lowerdev, -1);
1385 else
1386 err = dev_set_promiscuity(vlan->lowerdev, 1);
1387 if (err < 0)
1388 return err;
1389 }
1390 vlan->flags = flags;
1391 }
1392 if (set_mode)
1393 vlan->mode = mode;
1394 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1395 if (vlan->mode != MACVLAN_MODE_SOURCE)
1396 return -EINVAL;
1397 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1398 ret = macvlan_changelink_sources(vlan, macmode, data);
1399 if (ret)
1400 return ret;
1401 }
1402 return 0;
1403 }
1404
1405 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1406 {
1407 if (vlan->macaddr_count == 0)
1408 return 0;
1409 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1410 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1411 }
1412
1413 static size_t macvlan_get_size(const struct net_device *dev)
1414 {
1415 struct macvlan_dev *vlan = netdev_priv(dev);
1416
1417 return (0
1418 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1419 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1420 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1421 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1422 );
1423 }
1424
1425 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1426 const struct macvlan_dev *vlan,
1427 const int i)
1428 {
1429 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1430 struct macvlan_source_entry *entry;
1431
1432 hlist_for_each_entry_rcu(entry, h, hlist) {
1433 if (entry->vlan != vlan)
1434 continue;
1435 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1436 return 1;
1437 }
1438 return 0;
1439 }
1440
1441 static int macvlan_fill_info(struct sk_buff *skb,
1442 const struct net_device *dev)
1443 {
1444 struct macvlan_dev *vlan = netdev_priv(dev);
1445 int i;
1446 struct nlattr *nest;
1447
1448 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1449 goto nla_put_failure;
1450 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1451 goto nla_put_failure;
1452 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1453 goto nla_put_failure;
1454 if (vlan->macaddr_count > 0) {
1455 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1456 if (nest == NULL)
1457 goto nla_put_failure;
1458
1459 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1460 if (macvlan_fill_info_macaddr(skb, vlan, i))
1461 goto nla_put_failure;
1462 }
1463 nla_nest_end(skb, nest);
1464 }
1465 return 0;
1466
1467 nla_put_failure:
1468 return -EMSGSIZE;
1469 }
1470
1471 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1472 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1473 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1474 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1475 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1476 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1477 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1478 };
1479
1480 int macvlan_link_register(struct rtnl_link_ops *ops)
1481 {
1482 /* common fields */
1483 ops->priv_size = sizeof(struct macvlan_dev);
1484 ops->validate = macvlan_validate;
1485 ops->maxtype = IFLA_MACVLAN_MAX;
1486 ops->policy = macvlan_policy;
1487 ops->changelink = macvlan_changelink;
1488 ops->get_size = macvlan_get_size;
1489 ops->fill_info = macvlan_fill_info;
1490
1491 return rtnl_link_register(ops);
1492 };
1493 EXPORT_SYMBOL_GPL(macvlan_link_register);
1494
1495 static struct net *macvlan_get_link_net(const struct net_device *dev)
1496 {
1497 return dev_net(macvlan_dev_real_dev(dev));
1498 }
1499
1500 static struct rtnl_link_ops macvlan_link_ops = {
1501 .kind = "macvlan",
1502 .setup = macvlan_setup,
1503 .newlink = macvlan_newlink,
1504 .dellink = macvlan_dellink,
1505 .get_link_net = macvlan_get_link_net,
1506 };
1507
1508 static int macvlan_device_event(struct notifier_block *unused,
1509 unsigned long event, void *ptr)
1510 {
1511 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1512 struct macvlan_dev *vlan, *next;
1513 struct macvlan_port *port;
1514 LIST_HEAD(list_kill);
1515
1516 if (!macvlan_port_exists(dev))
1517 return NOTIFY_DONE;
1518
1519 port = macvlan_port_get_rtnl(dev);
1520
1521 switch (event) {
1522 case NETDEV_CHANGE:
1523 list_for_each_entry(vlan, &port->vlans, list)
1524 netif_stacked_transfer_operstate(vlan->lowerdev,
1525 vlan->dev);
1526 break;
1527 case NETDEV_FEAT_CHANGE:
1528 list_for_each_entry(vlan, &port->vlans, list) {
1529 vlan->dev->gso_max_size = dev->gso_max_size;
1530 netdev_update_features(vlan->dev);
1531 }
1532 break;
1533 case NETDEV_CHANGEMTU:
1534 list_for_each_entry(vlan, &port->vlans, list) {
1535 if (vlan->dev->mtu <= dev->mtu)
1536 continue;
1537 dev_set_mtu(vlan->dev, dev->mtu);
1538 }
1539 break;
1540 case NETDEV_CHANGEADDR:
1541 if (!port->passthru)
1542 return NOTIFY_DONE;
1543
1544 vlan = list_first_entry_or_null(&port->vlans,
1545 struct macvlan_dev,
1546 list);
1547
1548 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1549 return NOTIFY_BAD;
1550
1551 break;
1552 case NETDEV_UNREGISTER:
1553 /* twiddle thumbs on netns device moves */
1554 if (dev->reg_state != NETREG_UNREGISTERING)
1555 break;
1556
1557 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1558 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1559 unregister_netdevice_many(&list_kill);
1560 break;
1561 case NETDEV_PRE_TYPE_CHANGE:
1562 /* Forbid underlaying device to change its type. */
1563 return NOTIFY_BAD;
1564
1565 case NETDEV_NOTIFY_PEERS:
1566 case NETDEV_BONDING_FAILOVER:
1567 case NETDEV_RESEND_IGMP:
1568 /* Propagate to all vlans */
1569 list_for_each_entry(vlan, &port->vlans, list)
1570 call_netdevice_notifiers(event, vlan->dev);
1571 }
1572 return NOTIFY_DONE;
1573 }
1574
1575 static struct notifier_block macvlan_notifier_block __read_mostly = {
1576 .notifier_call = macvlan_device_event,
1577 };
1578
1579 static int __init macvlan_init_module(void)
1580 {
1581 int err;
1582
1583 register_netdevice_notifier(&macvlan_notifier_block);
1584
1585 err = macvlan_link_register(&macvlan_link_ops);
1586 if (err < 0)
1587 goto err1;
1588 return 0;
1589 err1:
1590 unregister_netdevice_notifier(&macvlan_notifier_block);
1591 return err;
1592 }
1593
1594 static void __exit macvlan_cleanup_module(void)
1595 {
1596 rtnl_link_unregister(&macvlan_link_ops);
1597 unregister_netdevice_notifier(&macvlan_notifier_block);
1598 }
1599
1600 module_init(macvlan_init_module);
1601 module_exit(macvlan_cleanup_module);
1602
1603 MODULE_LICENSE("GPL");
1604 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1605 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1606 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux with added FPC-III support