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drm/connector: store tile information from displayid (v3)
[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 .rebuild = eth_rebuild_header,
554 .parse = eth_header_parse,
555 .cache = eth_header_cache,
556 .cache_update = eth_header_cache_update,
557 };
558
559 static struct rtnl_link_ops macvlan_link_ops;
560
561 static int macvlan_open(struct net_device *dev)
562 {
563 struct macvlan_dev *vlan = netdev_priv(dev);
564 struct net_device *lowerdev = vlan->lowerdev;
565 int err;
566
567 if (vlan->port->passthru) {
568 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
569 err = dev_set_promiscuity(lowerdev, 1);
570 if (err < 0)
571 goto out;
572 }
573 goto hash_add;
574 }
575
576 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
577 dev->rtnl_link_ops == &macvlan_link_ops) {
578 vlan->fwd_priv =
579 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
580
581 /* If we get a NULL pointer back, or if we get an error
582 * then we should just fall through to the non accelerated path
583 */
584 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
585 vlan->fwd_priv = NULL;
586 } else
587 return 0;
588 }
589
590 err = -EBUSY;
591 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
592 goto out;
593
594 err = dev_uc_add(lowerdev, dev->dev_addr);
595 if (err < 0)
596 goto out;
597 if (dev->flags & IFF_ALLMULTI) {
598 err = dev_set_allmulti(lowerdev, 1);
599 if (err < 0)
600 goto del_unicast;
601 }
602
603 hash_add:
604 macvlan_hash_add(vlan);
605 return 0;
606
607 del_unicast:
608 dev_uc_del(lowerdev, dev->dev_addr);
609 out:
610 if (vlan->fwd_priv) {
611 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
612 vlan->fwd_priv);
613 vlan->fwd_priv = NULL;
614 }
615 return err;
616 }
617
618 static int macvlan_stop(struct net_device *dev)
619 {
620 struct macvlan_dev *vlan = netdev_priv(dev);
621 struct net_device *lowerdev = vlan->lowerdev;
622
623 if (vlan->fwd_priv) {
624 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
625 vlan->fwd_priv);
626 vlan->fwd_priv = NULL;
627 return 0;
628 }
629
630 dev_uc_unsync(lowerdev, dev);
631 dev_mc_unsync(lowerdev, dev);
632
633 if (vlan->port->passthru) {
634 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
635 dev_set_promiscuity(lowerdev, -1);
636 goto hash_del;
637 }
638
639 if (dev->flags & IFF_ALLMULTI)
640 dev_set_allmulti(lowerdev, -1);
641
642 dev_uc_del(lowerdev, dev->dev_addr);
643
644 hash_del:
645 macvlan_hash_del(vlan, !dev->dismantle);
646 return 0;
647 }
648
649 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
650 {
651 struct macvlan_dev *vlan = netdev_priv(dev);
652 struct net_device *lowerdev = vlan->lowerdev;
653 int err;
654
655 if (!(dev->flags & IFF_UP)) {
656 /* Just copy in the new address */
657 ether_addr_copy(dev->dev_addr, addr);
658 } else {
659 /* Rehash and update the device filters */
660 if (macvlan_addr_busy(vlan->port, addr))
661 return -EBUSY;
662
663 if (!vlan->port->passthru) {
664 err = dev_uc_add(lowerdev, addr);
665 if (err)
666 return err;
667
668 dev_uc_del(lowerdev, dev->dev_addr);
669 }
670
671 macvlan_hash_change_addr(vlan, addr);
672 }
673 return 0;
674 }
675
676 static int macvlan_set_mac_address(struct net_device *dev, void *p)
677 {
678 struct macvlan_dev *vlan = netdev_priv(dev);
679 struct sockaddr *addr = p;
680
681 if (!is_valid_ether_addr(addr->sa_data))
682 return -EADDRNOTAVAIL;
683
684 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
685 dev_set_mac_address(vlan->lowerdev, addr);
686 return 0;
687 }
688
689 return macvlan_sync_address(dev, addr->sa_data);
690 }
691
692 static void macvlan_change_rx_flags(struct net_device *dev, int change)
693 {
694 struct macvlan_dev *vlan = netdev_priv(dev);
695 struct net_device *lowerdev = vlan->lowerdev;
696
697 if (dev->flags & IFF_UP) {
698 if (change & IFF_ALLMULTI)
699 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
700 }
701 }
702
703 static void macvlan_set_mac_lists(struct net_device *dev)
704 {
705 struct macvlan_dev *vlan = netdev_priv(dev);
706
707 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
708 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
709 } else {
710 struct netdev_hw_addr *ha;
711 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
712
713 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
714 netdev_for_each_mc_addr(ha, dev) {
715 __set_bit(mc_hash(vlan, ha->addr), filter);
716 }
717
718 __set_bit(mc_hash(vlan, dev->broadcast), filter);
719
720 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
721 }
722 dev_uc_sync(vlan->lowerdev, dev);
723 dev_mc_sync(vlan->lowerdev, dev);
724 }
725
726 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
727 {
728 struct macvlan_dev *vlan = netdev_priv(dev);
729
730 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
731 return -EINVAL;
732 dev->mtu = new_mtu;
733 return 0;
734 }
735
736 /*
737 * macvlan network devices have devices nesting below it and are a special
738 * "super class" of normal network devices; split their locks off into a
739 * separate class since they always nest.
740 */
741 static struct lock_class_key macvlan_netdev_xmit_lock_key;
742 static struct lock_class_key macvlan_netdev_addr_lock_key;
743
744 #define ALWAYS_ON_FEATURES \
745 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
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_GSO_ROBUST | \
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->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
787 dev->gso_max_size = lowerdev->gso_max_size;
788 dev->iflink = lowerdev->ifindex;
789 dev->hard_header_len = lowerdev->hard_header_len;
790
791 macvlan_set_lockdep_class(dev);
792
793 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
794 if (!vlan->pcpu_stats)
795 return -ENOMEM;
796
797 return 0;
798 }
799
800 static void macvlan_uninit(struct net_device *dev)
801 {
802 struct macvlan_dev *vlan = netdev_priv(dev);
803 struct macvlan_port *port = vlan->port;
804
805 free_percpu(vlan->pcpu_stats);
806
807 macvlan_flush_sources(port, vlan);
808 port->count -= 1;
809 if (!port->count)
810 macvlan_port_destroy(port->dev);
811 }
812
813 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
814 struct rtnl_link_stats64 *stats)
815 {
816 struct macvlan_dev *vlan = netdev_priv(dev);
817
818 if (vlan->pcpu_stats) {
819 struct vlan_pcpu_stats *p;
820 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
821 u32 rx_errors = 0, tx_dropped = 0;
822 unsigned int start;
823 int i;
824
825 for_each_possible_cpu(i) {
826 p = per_cpu_ptr(vlan->pcpu_stats, i);
827 do {
828 start = u64_stats_fetch_begin_irq(&p->syncp);
829 rx_packets = p->rx_packets;
830 rx_bytes = p->rx_bytes;
831 rx_multicast = p->rx_multicast;
832 tx_packets = p->tx_packets;
833 tx_bytes = p->tx_bytes;
834 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
835
836 stats->rx_packets += rx_packets;
837 stats->rx_bytes += rx_bytes;
838 stats->multicast += rx_multicast;
839 stats->tx_packets += tx_packets;
840 stats->tx_bytes += tx_bytes;
841 /* rx_errors & tx_dropped are u32, updated
842 * without syncp protection.
843 */
844 rx_errors += p->rx_errors;
845 tx_dropped += p->tx_dropped;
846 }
847 stats->rx_errors = rx_errors;
848 stats->rx_dropped = rx_errors;
849 stats->tx_dropped = tx_dropped;
850 }
851 return stats;
852 }
853
854 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
855 __be16 proto, u16 vid)
856 {
857 struct macvlan_dev *vlan = netdev_priv(dev);
858 struct net_device *lowerdev = vlan->lowerdev;
859
860 return vlan_vid_add(lowerdev, proto, vid);
861 }
862
863 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
864 __be16 proto, u16 vid)
865 {
866 struct macvlan_dev *vlan = netdev_priv(dev);
867 struct net_device *lowerdev = vlan->lowerdev;
868
869 vlan_vid_del(lowerdev, proto, vid);
870 return 0;
871 }
872
873 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
874 struct net_device *dev,
875 const unsigned char *addr,
876 u16 flags)
877 {
878 struct macvlan_dev *vlan = netdev_priv(dev);
879 int err = -EINVAL;
880
881 /* Support unicast filter only on passthru devices.
882 * Multicast filter should be allowed on all devices.
883 */
884 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
885 return -EOPNOTSUPP;
886
887 if (flags & NLM_F_REPLACE)
888 return -EOPNOTSUPP;
889
890 if (is_unicast_ether_addr(addr))
891 err = dev_uc_add_excl(dev, addr);
892 else if (is_multicast_ether_addr(addr))
893 err = dev_mc_add_excl(dev, addr);
894
895 return err;
896 }
897
898 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
899 struct net_device *dev,
900 const unsigned char *addr)
901 {
902 struct macvlan_dev *vlan = netdev_priv(dev);
903 int err = -EINVAL;
904
905 /* Support unicast filter only on passthru devices.
906 * Multicast filter should be allowed on all devices.
907 */
908 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
909 return -EOPNOTSUPP;
910
911 if (is_unicast_ether_addr(addr))
912 err = dev_uc_del(dev, addr);
913 else if (is_multicast_ether_addr(addr))
914 err = dev_mc_del(dev, addr);
915
916 return err;
917 }
918
919 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
920 struct ethtool_drvinfo *drvinfo)
921 {
922 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
923 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
924 }
925
926 static int macvlan_ethtool_get_settings(struct net_device *dev,
927 struct ethtool_cmd *cmd)
928 {
929 const struct macvlan_dev *vlan = netdev_priv(dev);
930
931 return __ethtool_get_settings(vlan->lowerdev, cmd);
932 }
933
934 static netdev_features_t macvlan_fix_features(struct net_device *dev,
935 netdev_features_t features)
936 {
937 struct macvlan_dev *vlan = netdev_priv(dev);
938 netdev_features_t mask;
939
940 features |= NETIF_F_ALL_FOR_ALL;
941 features &= (vlan->set_features | ~MACVLAN_FEATURES);
942 mask = features;
943
944 features = netdev_increment_features(vlan->lowerdev->features,
945 features,
946 mask);
947 features |= ALWAYS_ON_FEATURES;
948 features &= ~NETIF_F_NETNS_LOCAL;
949
950 return features;
951 }
952
953 #ifdef CONFIG_NET_POLL_CONTROLLER
954 static void macvlan_dev_poll_controller(struct net_device *dev)
955 {
956 return;
957 }
958
959 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
960 {
961 struct macvlan_dev *vlan = netdev_priv(dev);
962 struct net_device *real_dev = vlan->lowerdev;
963 struct netpoll *netpoll;
964 int err = 0;
965
966 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
967 err = -ENOMEM;
968 if (!netpoll)
969 goto out;
970
971 err = __netpoll_setup(netpoll, real_dev);
972 if (err) {
973 kfree(netpoll);
974 goto out;
975 }
976
977 vlan->netpoll = netpoll;
978
979 out:
980 return err;
981 }
982
983 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
984 {
985 struct macvlan_dev *vlan = netdev_priv(dev);
986 struct netpoll *netpoll = vlan->netpoll;
987
988 if (!netpoll)
989 return;
990
991 vlan->netpoll = NULL;
992
993 __netpoll_free_async(netpoll);
994 }
995 #endif /* CONFIG_NET_POLL_CONTROLLER */
996
997 static const struct ethtool_ops macvlan_ethtool_ops = {
998 .get_link = ethtool_op_get_link,
999 .get_settings = macvlan_ethtool_get_settings,
1000 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1001 };
1002
1003 static const struct net_device_ops macvlan_netdev_ops = {
1004 .ndo_init = macvlan_init,
1005 .ndo_uninit = macvlan_uninit,
1006 .ndo_open = macvlan_open,
1007 .ndo_stop = macvlan_stop,
1008 .ndo_start_xmit = macvlan_start_xmit,
1009 .ndo_change_mtu = macvlan_change_mtu,
1010 .ndo_fix_features = macvlan_fix_features,
1011 .ndo_change_rx_flags = macvlan_change_rx_flags,
1012 .ndo_set_mac_address = macvlan_set_mac_address,
1013 .ndo_set_rx_mode = macvlan_set_mac_lists,
1014 .ndo_get_stats64 = macvlan_dev_get_stats64,
1015 .ndo_validate_addr = eth_validate_addr,
1016 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1017 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1018 .ndo_fdb_add = macvlan_fdb_add,
1019 .ndo_fdb_del = macvlan_fdb_del,
1020 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1021 .ndo_get_lock_subclass = macvlan_get_nest_level,
1022 #ifdef CONFIG_NET_POLL_CONTROLLER
1023 .ndo_poll_controller = macvlan_dev_poll_controller,
1024 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1025 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1026 #endif
1027 };
1028
1029 void macvlan_common_setup(struct net_device *dev)
1030 {
1031 ether_setup(dev);
1032
1033 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1034 netif_keep_dst(dev);
1035 dev->priv_flags |= IFF_UNICAST_FLT;
1036 dev->netdev_ops = &macvlan_netdev_ops;
1037 dev->destructor = free_netdev;
1038 dev->header_ops = &macvlan_hard_header_ops;
1039 dev->ethtool_ops = &macvlan_ethtool_ops;
1040 }
1041 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1042
1043 static void macvlan_setup(struct net_device *dev)
1044 {
1045 macvlan_common_setup(dev);
1046 dev->tx_queue_len = 0;
1047 }
1048
1049 static int macvlan_port_create(struct net_device *dev)
1050 {
1051 struct macvlan_port *port;
1052 unsigned int i;
1053 int err;
1054
1055 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1056 return -EINVAL;
1057
1058 port = kzalloc(sizeof(*port), GFP_KERNEL);
1059 if (port == NULL)
1060 return -ENOMEM;
1061
1062 port->passthru = false;
1063 port->dev = dev;
1064 INIT_LIST_HEAD(&port->vlans);
1065 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1066 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1067 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1068 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1069
1070 skb_queue_head_init(&port->bc_queue);
1071 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1072
1073 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1074 if (err)
1075 kfree(port);
1076 else
1077 dev->priv_flags |= IFF_MACVLAN_PORT;
1078 return err;
1079 }
1080
1081 static void macvlan_port_destroy(struct net_device *dev)
1082 {
1083 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1084
1085 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1086 netdev_rx_handler_unregister(dev);
1087
1088 /* After this point, no packet can schedule bc_work anymore,
1089 * but we need to cancel it and purge left skbs if any.
1090 */
1091 cancel_work_sync(&port->bc_work);
1092 __skb_queue_purge(&port->bc_queue);
1093
1094 kfree_rcu(port, rcu);
1095 }
1096
1097 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1098 {
1099 if (tb[IFLA_ADDRESS]) {
1100 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1101 return -EINVAL;
1102 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1103 return -EADDRNOTAVAIL;
1104 }
1105
1106 if (data && data[IFLA_MACVLAN_FLAGS] &&
1107 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1108 return -EINVAL;
1109
1110 if (data && data[IFLA_MACVLAN_MODE]) {
1111 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1112 case MACVLAN_MODE_PRIVATE:
1113 case MACVLAN_MODE_VEPA:
1114 case MACVLAN_MODE_BRIDGE:
1115 case MACVLAN_MODE_PASSTHRU:
1116 case MACVLAN_MODE_SOURCE:
1117 break;
1118 default:
1119 return -EINVAL;
1120 }
1121 }
1122
1123 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1124 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1125 case MACVLAN_MACADDR_ADD:
1126 case MACVLAN_MACADDR_DEL:
1127 case MACVLAN_MACADDR_FLUSH:
1128 case MACVLAN_MACADDR_SET:
1129 break;
1130 default:
1131 return -EINVAL;
1132 }
1133 }
1134
1135 if (data && data[IFLA_MACVLAN_MACADDR]) {
1136 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1137 return -EINVAL;
1138
1139 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1140 return -EADDRNOTAVAIL;
1141 }
1142
1143 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1144 return -EINVAL;
1145
1146 return 0;
1147 }
1148
1149 /**
1150 * reconfigure list of remote source mac address
1151 * (only for macvlan devices in source mode)
1152 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1153 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1154 */
1155 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1156 struct nlattr *data[])
1157 {
1158 char *addr = NULL;
1159 int ret, rem, len;
1160 struct nlattr *nla, *head;
1161 struct macvlan_source_entry *entry;
1162
1163 if (data[IFLA_MACVLAN_MACADDR])
1164 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1165
1166 if (mode == MACVLAN_MACADDR_ADD) {
1167 if (!addr)
1168 return -EINVAL;
1169
1170 return macvlan_hash_add_source(vlan, addr);
1171
1172 } else if (mode == MACVLAN_MACADDR_DEL) {
1173 if (!addr)
1174 return -EINVAL;
1175
1176 entry = macvlan_hash_lookup_source(vlan, addr);
1177 if (entry) {
1178 macvlan_hash_del_source(entry);
1179 vlan->macaddr_count--;
1180 }
1181 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1182 macvlan_flush_sources(vlan->port, vlan);
1183 } else if (mode == MACVLAN_MACADDR_SET) {
1184 macvlan_flush_sources(vlan->port, vlan);
1185
1186 if (addr) {
1187 ret = macvlan_hash_add_source(vlan, addr);
1188 if (ret)
1189 return ret;
1190 }
1191
1192 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1193 return 0;
1194
1195 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1196 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1197
1198 nla_for_each_attr(nla, head, len, rem) {
1199 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1200 nla_len(nla) != ETH_ALEN)
1201 continue;
1202
1203 addr = nla_data(nla);
1204 ret = macvlan_hash_add_source(vlan, addr);
1205 if (ret)
1206 return ret;
1207 }
1208 } else {
1209 return -EINVAL;
1210 }
1211
1212 return 0;
1213 }
1214
1215 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1216 struct nlattr *tb[], struct nlattr *data[])
1217 {
1218 struct macvlan_dev *vlan = netdev_priv(dev);
1219 struct macvlan_port *port;
1220 struct net_device *lowerdev;
1221 int err;
1222 int macmode;
1223
1224 if (!tb[IFLA_LINK])
1225 return -EINVAL;
1226
1227 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1228 if (lowerdev == NULL)
1229 return -ENODEV;
1230
1231 /* When creating macvlans or macvtaps on top of other macvlans - use
1232 * the real device as the lowerdev.
1233 */
1234 if (netif_is_macvlan(lowerdev))
1235 lowerdev = macvlan_dev_real_dev(lowerdev);
1236
1237 if (!tb[IFLA_MTU])
1238 dev->mtu = lowerdev->mtu;
1239 else if (dev->mtu > lowerdev->mtu)
1240 return -EINVAL;
1241
1242 if (!tb[IFLA_ADDRESS])
1243 eth_hw_addr_random(dev);
1244
1245 if (!macvlan_port_exists(lowerdev)) {
1246 err = macvlan_port_create(lowerdev);
1247 if (err < 0)
1248 return err;
1249 }
1250 port = macvlan_port_get_rtnl(lowerdev);
1251
1252 /* Only 1 macvlan device can be created in passthru mode */
1253 if (port->passthru)
1254 return -EINVAL;
1255
1256 vlan->lowerdev = lowerdev;
1257 vlan->dev = dev;
1258 vlan->port = port;
1259 vlan->set_features = MACVLAN_FEATURES;
1260 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1261
1262 vlan->mode = MACVLAN_MODE_VEPA;
1263 if (data && data[IFLA_MACVLAN_MODE])
1264 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1265
1266 if (data && data[IFLA_MACVLAN_FLAGS])
1267 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1268
1269 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1270 if (port->count)
1271 return -EINVAL;
1272 port->passthru = true;
1273 eth_hw_addr_inherit(dev, lowerdev);
1274 }
1275
1276 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1277 if (vlan->mode != MACVLAN_MODE_SOURCE)
1278 return -EINVAL;
1279 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1280 err = macvlan_changelink_sources(vlan, macmode, data);
1281 if (err)
1282 return err;
1283 }
1284
1285 port->count += 1;
1286 err = register_netdevice(dev);
1287 if (err < 0)
1288 goto destroy_port;
1289
1290 dev->priv_flags |= IFF_MACVLAN;
1291 err = netdev_upper_dev_link(lowerdev, dev);
1292 if (err)
1293 goto unregister_netdev;
1294
1295 list_add_tail_rcu(&vlan->list, &port->vlans);
1296 netif_stacked_transfer_operstate(lowerdev, dev);
1297
1298 return 0;
1299
1300 unregister_netdev:
1301 unregister_netdevice(dev);
1302 destroy_port:
1303 port->count -= 1;
1304 if (!port->count)
1305 macvlan_port_destroy(lowerdev);
1306
1307 return err;
1308 }
1309 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1310
1311 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1312 struct nlattr *tb[], struct nlattr *data[])
1313 {
1314 return macvlan_common_newlink(src_net, dev, tb, data);
1315 }
1316
1317 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1318 {
1319 struct macvlan_dev *vlan = netdev_priv(dev);
1320
1321 if (vlan->mode == MACVLAN_MODE_SOURCE)
1322 macvlan_flush_sources(vlan->port, vlan);
1323 list_del_rcu(&vlan->list);
1324 unregister_netdevice_queue(dev, head);
1325 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1326 }
1327 EXPORT_SYMBOL_GPL(macvlan_dellink);
1328
1329 static int macvlan_changelink(struct net_device *dev,
1330 struct nlattr *tb[], struct nlattr *data[])
1331 {
1332 struct macvlan_dev *vlan = netdev_priv(dev);
1333 enum macvlan_mode mode;
1334 bool set_mode = false;
1335 enum macvlan_macaddr_mode macmode;
1336 int ret;
1337
1338 /* Validate mode, but don't set yet: setting flags may fail. */
1339 if (data && data[IFLA_MACVLAN_MODE]) {
1340 set_mode = true;
1341 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1342 /* Passthrough mode can't be set or cleared dynamically */
1343 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1344 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1345 return -EINVAL;
1346 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1347 vlan->mode != mode)
1348 macvlan_flush_sources(vlan->port, vlan);
1349 }
1350
1351 if (data && data[IFLA_MACVLAN_FLAGS]) {
1352 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1353 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1354 if (vlan->port->passthru && promisc) {
1355 int err;
1356
1357 if (flags & MACVLAN_FLAG_NOPROMISC)
1358 err = dev_set_promiscuity(vlan->lowerdev, -1);
1359 else
1360 err = dev_set_promiscuity(vlan->lowerdev, 1);
1361 if (err < 0)
1362 return err;
1363 }
1364 vlan->flags = flags;
1365 }
1366 if (set_mode)
1367 vlan->mode = mode;
1368 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1369 if (vlan->mode != MACVLAN_MODE_SOURCE)
1370 return -EINVAL;
1371 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1372 ret = macvlan_changelink_sources(vlan, macmode, data);
1373 if (ret)
1374 return ret;
1375 }
1376 return 0;
1377 }
1378
1379 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1380 {
1381 if (vlan->macaddr_count == 0)
1382 return 0;
1383 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1384 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1385 }
1386
1387 static size_t macvlan_get_size(const struct net_device *dev)
1388 {
1389 struct macvlan_dev *vlan = netdev_priv(dev);
1390
1391 return (0
1392 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1393 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1394 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1395 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1396 );
1397 }
1398
1399 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1400 const struct macvlan_dev *vlan,
1401 const int i)
1402 {
1403 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1404 struct macvlan_source_entry *entry;
1405
1406 hlist_for_each_entry_rcu(entry, h, hlist) {
1407 if (entry->vlan != vlan)
1408 continue;
1409 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1410 return 1;
1411 }
1412 return 0;
1413 }
1414
1415 static int macvlan_fill_info(struct sk_buff *skb,
1416 const struct net_device *dev)
1417 {
1418 struct macvlan_dev *vlan = netdev_priv(dev);
1419 int i;
1420 struct nlattr *nest;
1421
1422 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1423 goto nla_put_failure;
1424 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1425 goto nla_put_failure;
1426 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1427 goto nla_put_failure;
1428 if (vlan->macaddr_count > 0) {
1429 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1430 if (nest == NULL)
1431 goto nla_put_failure;
1432
1433 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1434 if (macvlan_fill_info_macaddr(skb, vlan, i))
1435 goto nla_put_failure;
1436 }
1437 nla_nest_end(skb, nest);
1438 }
1439 return 0;
1440
1441 nla_put_failure:
1442 return -EMSGSIZE;
1443 }
1444
1445 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1446 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1447 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1448 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1449 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1450 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1451 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1452 };
1453
1454 int macvlan_link_register(struct rtnl_link_ops *ops)
1455 {
1456 /* common fields */
1457 ops->priv_size = sizeof(struct macvlan_dev);
1458 ops->validate = macvlan_validate;
1459 ops->maxtype = IFLA_MACVLAN_MAX;
1460 ops->policy = macvlan_policy;
1461 ops->changelink = macvlan_changelink;
1462 ops->get_size = macvlan_get_size;
1463 ops->fill_info = macvlan_fill_info;
1464
1465 return rtnl_link_register(ops);
1466 };
1467 EXPORT_SYMBOL_GPL(macvlan_link_register);
1468
1469 static struct rtnl_link_ops macvlan_link_ops = {
1470 .kind = "macvlan",
1471 .setup = macvlan_setup,
1472 .newlink = macvlan_newlink,
1473 .dellink = macvlan_dellink,
1474 };
1475
1476 static int macvlan_device_event(struct notifier_block *unused,
1477 unsigned long event, void *ptr)
1478 {
1479 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1480 struct macvlan_dev *vlan, *next;
1481 struct macvlan_port *port;
1482 LIST_HEAD(list_kill);
1483
1484 if (!macvlan_port_exists(dev))
1485 return NOTIFY_DONE;
1486
1487 port = macvlan_port_get_rtnl(dev);
1488
1489 switch (event) {
1490 case NETDEV_CHANGE:
1491 list_for_each_entry(vlan, &port->vlans, list)
1492 netif_stacked_transfer_operstate(vlan->lowerdev,
1493 vlan->dev);
1494 break;
1495 case NETDEV_FEAT_CHANGE:
1496 list_for_each_entry(vlan, &port->vlans, list) {
1497 vlan->dev->gso_max_size = dev->gso_max_size;
1498 netdev_update_features(vlan->dev);
1499 }
1500 break;
1501 case NETDEV_CHANGEMTU:
1502 list_for_each_entry(vlan, &port->vlans, list) {
1503 if (vlan->dev->mtu <= dev->mtu)
1504 continue;
1505 dev_set_mtu(vlan->dev, dev->mtu);
1506 }
1507 break;
1508 case NETDEV_CHANGEADDR:
1509 if (!port->passthru)
1510 return NOTIFY_DONE;
1511
1512 vlan = list_first_entry_or_null(&port->vlans,
1513 struct macvlan_dev,
1514 list);
1515
1516 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1517 return NOTIFY_BAD;
1518
1519 break;
1520 case NETDEV_UNREGISTER:
1521 /* twiddle thumbs on netns device moves */
1522 if (dev->reg_state != NETREG_UNREGISTERING)
1523 break;
1524
1525 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1526 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1527 unregister_netdevice_many(&list_kill);
1528 break;
1529 case NETDEV_PRE_TYPE_CHANGE:
1530 /* Forbid underlaying device to change its type. */
1531 return NOTIFY_BAD;
1532
1533 case NETDEV_NOTIFY_PEERS:
1534 case NETDEV_BONDING_FAILOVER:
1535 case NETDEV_RESEND_IGMP:
1536 /* Propagate to all vlans */
1537 list_for_each_entry(vlan, &port->vlans, list)
1538 call_netdevice_notifiers(event, vlan->dev);
1539 }
1540 return NOTIFY_DONE;
1541 }
1542
1543 static struct notifier_block macvlan_notifier_block __read_mostly = {
1544 .notifier_call = macvlan_device_event,
1545 };
1546
1547 static int __init macvlan_init_module(void)
1548 {
1549 int err;
1550
1551 register_netdevice_notifier(&macvlan_notifier_block);
1552
1553 err = macvlan_link_register(&macvlan_link_ops);
1554 if (err < 0)
1555 goto err1;
1556 return 0;
1557 err1:
1558 unregister_netdevice_notifier(&macvlan_notifier_block);
1559 return err;
1560 }
1561
1562 static void __exit macvlan_cleanup_module(void)
1563 {
1564 rtnl_link_unregister(&macvlan_link_ops);
1565 unregister_netdevice_notifier(&macvlan_notifier_block);
1566 }
1567
1568 module_init(macvlan_init_module);
1569 module_exit(macvlan_cleanup_module);
1570
1571 MODULE_LICENSE("GPL");
1572 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1573 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1574 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux kernel - Deliverables
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