xref: /openbmc/linux/drivers/net/macvlan.c (revision ae3473231e77a3f1909d48cd144cebe5e1d049b3)
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 sk_buff_head	bc_queue;
47 	struct work_struct	bc_work;
48 	bool 			passthru;
49 	int			count;
50 	struct hlist_head	vlan_source_hash[MACVLAN_HASH_SIZE];
51 	DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
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 bool 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 true;
190 
191 	if (macvlan_hash_lookup(port, addr))
192 		return true;
193 
194 	return false;
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 		if (src)
309 			dev_put(src->dev);
310 		kfree_skb(skb);
311 	}
312 }
313 
314 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
315 				      const struct macvlan_dev *src,
316 				      struct sk_buff *skb)
317 {
318 	struct sk_buff *nskb;
319 	int err = -ENOMEM;
320 
321 	nskb = skb_clone(skb, GFP_ATOMIC);
322 	if (!nskb)
323 		goto err;
324 
325 	MACVLAN_SKB_CB(nskb)->src = src;
326 
327 	spin_lock(&port->bc_queue.lock);
328 	if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
329 		if (src)
330 			dev_hold(src->dev);
331 		__skb_queue_tail(&port->bc_queue, nskb);
332 		err = 0;
333 	}
334 	spin_unlock(&port->bc_queue.lock);
335 
336 	if (err)
337 		goto free_nskb;
338 
339 	schedule_work(&port->bc_work);
340 	return;
341 
342 free_nskb:
343 	kfree_skb(nskb);
344 err:
345 	atomic_long_inc(&skb->dev->rx_dropped);
346 }
347 
348 static void macvlan_flush_sources(struct macvlan_port *port,
349 				  struct macvlan_dev *vlan)
350 {
351 	int i;
352 
353 	for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
354 		struct hlist_node *h, *n;
355 
356 		hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
357 			struct macvlan_source_entry *entry;
358 
359 			entry = hlist_entry(h, struct macvlan_source_entry,
360 					    hlist);
361 			if (entry->vlan == vlan)
362 				macvlan_hash_del_source(entry);
363 		}
364 	}
365 	vlan->macaddr_count = 0;
366 }
367 
368 static void macvlan_forward_source_one(struct sk_buff *skb,
369 				       struct macvlan_dev *vlan)
370 {
371 	struct sk_buff *nskb;
372 	struct net_device *dev;
373 	int len;
374 	int ret;
375 
376 	dev = vlan->dev;
377 	if (unlikely(!(dev->flags & IFF_UP)))
378 		return;
379 
380 	nskb = skb_clone(skb, GFP_ATOMIC);
381 	if (!nskb)
382 		return;
383 
384 	len = nskb->len + ETH_HLEN;
385 	nskb->dev = dev;
386 	nskb->pkt_type = PACKET_HOST;
387 
388 	ret = netif_rx(nskb);
389 	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
390 }
391 
392 static void macvlan_forward_source(struct sk_buff *skb,
393 				   struct macvlan_port *port,
394 				   const unsigned char *addr)
395 {
396 	struct macvlan_source_entry *entry;
397 	u32 idx = macvlan_eth_hash(addr);
398 	struct hlist_head *h = &port->vlan_source_hash[idx];
399 
400 	hlist_for_each_entry_rcu(entry, h, hlist) {
401 		if (ether_addr_equal_64bits(entry->addr, addr))
402 			macvlan_forward_source_one(skb, entry->vlan);
403 	}
404 }
405 
406 /* called under rcu_read_lock() from netif_receive_skb */
407 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
408 {
409 	struct macvlan_port *port;
410 	struct sk_buff *skb = *pskb;
411 	const struct ethhdr *eth = eth_hdr(skb);
412 	const struct macvlan_dev *vlan;
413 	const struct macvlan_dev *src;
414 	struct net_device *dev;
415 	unsigned int len = 0;
416 	int ret;
417 	rx_handler_result_t handle_res;
418 
419 	port = macvlan_port_get_rcu(skb->dev);
420 	if (is_multicast_ether_addr(eth->h_dest)) {
421 		unsigned int hash;
422 
423 		skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
424 		if (!skb)
425 			return RX_HANDLER_CONSUMED;
426 		*pskb = skb;
427 		eth = eth_hdr(skb);
428 		macvlan_forward_source(skb, port, eth->h_source);
429 		src = macvlan_hash_lookup(port, eth->h_source);
430 		if (src && src->mode != MACVLAN_MODE_VEPA &&
431 		    src->mode != MACVLAN_MODE_BRIDGE) {
432 			/* forward to original port. */
433 			vlan = src;
434 			ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
435 			      netif_rx(skb);
436 			handle_res = RX_HANDLER_CONSUMED;
437 			goto out;
438 		}
439 
440 		hash = mc_hash(NULL, eth->h_dest);
441 		if (test_bit(hash, port->mc_filter))
442 			macvlan_broadcast_enqueue(port, src, skb);
443 
444 		return RX_HANDLER_PASS;
445 	}
446 
447 	macvlan_forward_source(skb, port, eth->h_source);
448 	if (port->passthru)
449 		vlan = list_first_or_null_rcu(&port->vlans,
450 					      struct macvlan_dev, list);
451 	else
452 		vlan = macvlan_hash_lookup(port, eth->h_dest);
453 	if (vlan == NULL)
454 		return RX_HANDLER_PASS;
455 
456 	dev = vlan->dev;
457 	if (unlikely(!(dev->flags & IFF_UP))) {
458 		kfree_skb(skb);
459 		return RX_HANDLER_CONSUMED;
460 	}
461 	len = skb->len + ETH_HLEN;
462 	skb = skb_share_check(skb, GFP_ATOMIC);
463 	if (!skb) {
464 		ret = NET_RX_DROP;
465 		handle_res = RX_HANDLER_CONSUMED;
466 		goto out;
467 	}
468 
469 	*pskb = skb;
470 	skb->dev = dev;
471 	skb->pkt_type = PACKET_HOST;
472 
473 	ret = NET_RX_SUCCESS;
474 	handle_res = RX_HANDLER_ANOTHER;
475 out:
476 	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
477 	return handle_res;
478 }
479 
480 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
481 {
482 	const struct macvlan_dev *vlan = netdev_priv(dev);
483 	const struct macvlan_port *port = vlan->port;
484 	const struct macvlan_dev *dest;
485 
486 	if (vlan->mode == MACVLAN_MODE_BRIDGE) {
487 		const struct ethhdr *eth = (void *)skb->data;
488 
489 		/* send to other bridge ports directly */
490 		if (is_multicast_ether_addr(eth->h_dest)) {
491 			macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
492 			goto xmit_world;
493 		}
494 
495 		dest = macvlan_hash_lookup(port, eth->h_dest);
496 		if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
497 			/* send to lowerdev first for its network taps */
498 			dev_forward_skb(vlan->lowerdev, skb);
499 
500 			return NET_XMIT_SUCCESS;
501 		}
502 	}
503 
504 xmit_world:
505 	skb->dev = vlan->lowerdev;
506 	return dev_queue_xmit(skb);
507 }
508 
509 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
510 {
511 #ifdef CONFIG_NET_POLL_CONTROLLER
512 	if (vlan->netpoll)
513 		netpoll_send_skb(vlan->netpoll, skb);
514 #else
515 	BUG();
516 #endif
517 	return NETDEV_TX_OK;
518 }
519 
520 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
521 				      struct net_device *dev)
522 {
523 	unsigned int len = skb->len;
524 	int ret;
525 	struct macvlan_dev *vlan = netdev_priv(dev);
526 
527 	if (unlikely(netpoll_tx_running(dev)))
528 		return macvlan_netpoll_send_skb(vlan, skb);
529 
530 	if (vlan->fwd_priv) {
531 		skb->dev = vlan->lowerdev;
532 		ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
533 	} else {
534 		ret = macvlan_queue_xmit(skb, dev);
535 	}
536 
537 	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
538 		struct vlan_pcpu_stats *pcpu_stats;
539 
540 		pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
541 		u64_stats_update_begin(&pcpu_stats->syncp);
542 		pcpu_stats->tx_packets++;
543 		pcpu_stats->tx_bytes += len;
544 		u64_stats_update_end(&pcpu_stats->syncp);
545 	} else {
546 		this_cpu_inc(vlan->pcpu_stats->tx_dropped);
547 	}
548 	return ret;
549 }
550 
551 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
552 			       unsigned short type, const void *daddr,
553 			       const void *saddr, unsigned len)
554 {
555 	const struct macvlan_dev *vlan = netdev_priv(dev);
556 	struct net_device *lowerdev = vlan->lowerdev;
557 
558 	return dev_hard_header(skb, lowerdev, type, daddr,
559 			       saddr ? : dev->dev_addr, len);
560 }
561 
562 static const struct header_ops macvlan_hard_header_ops = {
563 	.create  	= macvlan_hard_header,
564 	.parse		= eth_header_parse,
565 	.cache		= eth_header_cache,
566 	.cache_update	= eth_header_cache_update,
567 };
568 
569 static struct rtnl_link_ops macvlan_link_ops;
570 
571 static int macvlan_open(struct net_device *dev)
572 {
573 	struct macvlan_dev *vlan = netdev_priv(dev);
574 	struct net_device *lowerdev = vlan->lowerdev;
575 	int err;
576 
577 	if (vlan->port->passthru) {
578 		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
579 			err = dev_set_promiscuity(lowerdev, 1);
580 			if (err < 0)
581 				goto out;
582 		}
583 		goto hash_add;
584 	}
585 
586 	if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
587 	    dev->rtnl_link_ops == &macvlan_link_ops) {
588 		vlan->fwd_priv =
589 		      lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
590 
591 		/* If we get a NULL pointer back, or if we get an error
592 		 * then we should just fall through to the non accelerated path
593 		 */
594 		if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
595 			vlan->fwd_priv = NULL;
596 		} else
597 			return 0;
598 	}
599 
600 	err = -EBUSY;
601 	if (macvlan_addr_busy(vlan->port, dev->dev_addr))
602 		goto out;
603 
604 	err = dev_uc_add(lowerdev, dev->dev_addr);
605 	if (err < 0)
606 		goto out;
607 	if (dev->flags & IFF_ALLMULTI) {
608 		err = dev_set_allmulti(lowerdev, 1);
609 		if (err < 0)
610 			goto del_unicast;
611 	}
612 
613 	if (dev->flags & IFF_PROMISC) {
614 		err = dev_set_promiscuity(lowerdev, 1);
615 		if (err < 0)
616 			goto clear_multi;
617 	}
618 
619 hash_add:
620 	macvlan_hash_add(vlan);
621 	return 0;
622 
623 clear_multi:
624 	if (dev->flags & IFF_ALLMULTI)
625 		dev_set_allmulti(lowerdev, -1);
626 del_unicast:
627 	dev_uc_del(lowerdev, dev->dev_addr);
628 out:
629 	if (vlan->fwd_priv) {
630 		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
631 							   vlan->fwd_priv);
632 		vlan->fwd_priv = NULL;
633 	}
634 	return err;
635 }
636 
637 static int macvlan_stop(struct net_device *dev)
638 {
639 	struct macvlan_dev *vlan = netdev_priv(dev);
640 	struct net_device *lowerdev = vlan->lowerdev;
641 
642 	if (vlan->fwd_priv) {
643 		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
644 							   vlan->fwd_priv);
645 		vlan->fwd_priv = NULL;
646 		return 0;
647 	}
648 
649 	dev_uc_unsync(lowerdev, dev);
650 	dev_mc_unsync(lowerdev, dev);
651 
652 	if (vlan->port->passthru) {
653 		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
654 			dev_set_promiscuity(lowerdev, -1);
655 		goto hash_del;
656 	}
657 
658 	if (dev->flags & IFF_ALLMULTI)
659 		dev_set_allmulti(lowerdev, -1);
660 
661 	if (dev->flags & IFF_PROMISC)
662 		dev_set_promiscuity(lowerdev, -1);
663 
664 	dev_uc_del(lowerdev, dev->dev_addr);
665 
666 hash_del:
667 	macvlan_hash_del(vlan, !dev->dismantle);
668 	return 0;
669 }
670 
671 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
672 {
673 	struct macvlan_dev *vlan = netdev_priv(dev);
674 	struct net_device *lowerdev = vlan->lowerdev;
675 	int err;
676 
677 	if (!(dev->flags & IFF_UP)) {
678 		/* Just copy in the new address */
679 		ether_addr_copy(dev->dev_addr, addr);
680 	} else {
681 		/* Rehash and update the device filters */
682 		if (macvlan_addr_busy(vlan->port, addr))
683 			return -EBUSY;
684 
685 		if (!vlan->port->passthru) {
686 			err = dev_uc_add(lowerdev, addr);
687 			if (err)
688 				return err;
689 
690 			dev_uc_del(lowerdev, dev->dev_addr);
691 		}
692 
693 		macvlan_hash_change_addr(vlan, addr);
694 	}
695 	return 0;
696 }
697 
698 static int macvlan_set_mac_address(struct net_device *dev, void *p)
699 {
700 	struct macvlan_dev *vlan = netdev_priv(dev);
701 	struct sockaddr *addr = p;
702 
703 	if (!is_valid_ether_addr(addr->sa_data))
704 		return -EADDRNOTAVAIL;
705 
706 	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
707 		dev_set_mac_address(vlan->lowerdev, addr);
708 		return 0;
709 	}
710 
711 	return macvlan_sync_address(dev, addr->sa_data);
712 }
713 
714 static void macvlan_change_rx_flags(struct net_device *dev, int change)
715 {
716 	struct macvlan_dev *vlan = netdev_priv(dev);
717 	struct net_device *lowerdev = vlan->lowerdev;
718 
719 	if (dev->flags & IFF_UP) {
720 		if (change & IFF_ALLMULTI)
721 			dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
722 		if (change & IFF_PROMISC)
723 			dev_set_promiscuity(lowerdev,
724 					    dev->flags & IFF_PROMISC ? 1 : -1);
725 
726 	}
727 }
728 
729 static void macvlan_compute_filter(unsigned long *mc_filter,
730 				   struct net_device *dev,
731 				   struct macvlan_dev *vlan)
732 {
733 	if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
734 		bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
735 	} else {
736 		struct netdev_hw_addr *ha;
737 		DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
738 
739 		bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
740 		netdev_for_each_mc_addr(ha, dev) {
741 			__set_bit(mc_hash(vlan, ha->addr), filter);
742 		}
743 
744 		__set_bit(mc_hash(vlan, dev->broadcast), filter);
745 
746 		bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
747 	}
748 }
749 
750 static void macvlan_set_mac_lists(struct net_device *dev)
751 {
752 	struct macvlan_dev *vlan = netdev_priv(dev);
753 
754 	macvlan_compute_filter(vlan->mc_filter, dev, vlan);
755 
756 	dev_uc_sync(vlan->lowerdev, dev);
757 	dev_mc_sync(vlan->lowerdev, dev);
758 
759 	/* This is slightly inaccurate as we're including the subscription
760 	 * list of vlan->lowerdev too.
761 	 *
762 	 * Bug alert: This only works if everyone has the same broadcast
763 	 * address as lowerdev.  As soon as someone changes theirs this
764 	 * will break.
765 	 *
766 	 * However, this is already broken as when you change your broadcast
767 	 * address we don't get called.
768 	 *
769 	 * The solution is to maintain a list of broadcast addresses like
770 	 * we do for uc/mc, if you care.
771 	 */
772 	macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
773 }
774 
775 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
776 {
777 	struct macvlan_dev *vlan = netdev_priv(dev);
778 
779 	if (vlan->lowerdev->mtu < new_mtu)
780 		return -EINVAL;
781 	dev->mtu = new_mtu;
782 	return 0;
783 }
784 
785 /*
786  * macvlan network devices have devices nesting below it and are a special
787  * "super class" of normal network devices; split their locks off into a
788  * separate class since they always nest.
789  */
790 static struct lock_class_key macvlan_netdev_addr_lock_key;
791 
792 #define ALWAYS_ON_FEATURES \
793 	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
794 	 NETIF_F_GSO_ROBUST)
795 
796 #define MACVLAN_FEATURES \
797 	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
798 	 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
799 	 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
800 	 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
801 
802 #define MACVLAN_STATE_MASK \
803 	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
804 
805 static int macvlan_get_nest_level(struct net_device *dev)
806 {
807 	return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
808 }
809 
810 static void macvlan_set_lockdep_class(struct net_device *dev)
811 {
812 	netdev_lockdep_set_classes(dev);
813 	lockdep_set_class_and_subclass(&dev->addr_list_lock,
814 				       &macvlan_netdev_addr_lock_key,
815 				       macvlan_get_nest_level(dev));
816 }
817 
818 static int macvlan_init(struct net_device *dev)
819 {
820 	struct macvlan_dev *vlan = netdev_priv(dev);
821 	const struct net_device *lowerdev = vlan->lowerdev;
822 	struct macvlan_port *port = vlan->port;
823 
824 	dev->state		= (dev->state & ~MACVLAN_STATE_MASK) |
825 				  (lowerdev->state & MACVLAN_STATE_MASK);
826 	dev->features 		= lowerdev->features & MACVLAN_FEATURES;
827 	dev->features		|= ALWAYS_ON_FEATURES;
828 	dev->hw_features	|= NETIF_F_LRO;
829 	dev->vlan_features	= lowerdev->vlan_features & MACVLAN_FEATURES;
830 	dev->gso_max_size	= lowerdev->gso_max_size;
831 	dev->gso_max_segs	= lowerdev->gso_max_segs;
832 	dev->hard_header_len	= lowerdev->hard_header_len;
833 
834 	macvlan_set_lockdep_class(dev);
835 
836 	vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
837 	if (!vlan->pcpu_stats)
838 		return -ENOMEM;
839 
840 	port->count += 1;
841 
842 	return 0;
843 }
844 
845 static void macvlan_uninit(struct net_device *dev)
846 {
847 	struct macvlan_dev *vlan = netdev_priv(dev);
848 	struct macvlan_port *port = vlan->port;
849 
850 	free_percpu(vlan->pcpu_stats);
851 
852 	macvlan_flush_sources(port, vlan);
853 	port->count -= 1;
854 	if (!port->count)
855 		macvlan_port_destroy(port->dev);
856 }
857 
858 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
859 							 struct rtnl_link_stats64 *stats)
860 {
861 	struct macvlan_dev *vlan = netdev_priv(dev);
862 
863 	if (vlan->pcpu_stats) {
864 		struct vlan_pcpu_stats *p;
865 		u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
866 		u32 rx_errors = 0, tx_dropped = 0;
867 		unsigned int start;
868 		int i;
869 
870 		for_each_possible_cpu(i) {
871 			p = per_cpu_ptr(vlan->pcpu_stats, i);
872 			do {
873 				start = u64_stats_fetch_begin_irq(&p->syncp);
874 				rx_packets	= p->rx_packets;
875 				rx_bytes	= p->rx_bytes;
876 				rx_multicast	= p->rx_multicast;
877 				tx_packets	= p->tx_packets;
878 				tx_bytes	= p->tx_bytes;
879 			} while (u64_stats_fetch_retry_irq(&p->syncp, start));
880 
881 			stats->rx_packets	+= rx_packets;
882 			stats->rx_bytes		+= rx_bytes;
883 			stats->multicast	+= rx_multicast;
884 			stats->tx_packets	+= tx_packets;
885 			stats->tx_bytes		+= tx_bytes;
886 			/* rx_errors & tx_dropped are u32, updated
887 			 * without syncp protection.
888 			 */
889 			rx_errors	+= p->rx_errors;
890 			tx_dropped	+= p->tx_dropped;
891 		}
892 		stats->rx_errors	= rx_errors;
893 		stats->rx_dropped	= rx_errors;
894 		stats->tx_dropped	= tx_dropped;
895 	}
896 	return stats;
897 }
898 
899 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
900 				   __be16 proto, u16 vid)
901 {
902 	struct macvlan_dev *vlan = netdev_priv(dev);
903 	struct net_device *lowerdev = vlan->lowerdev;
904 
905 	return vlan_vid_add(lowerdev, proto, vid);
906 }
907 
908 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
909 				    __be16 proto, u16 vid)
910 {
911 	struct macvlan_dev *vlan = netdev_priv(dev);
912 	struct net_device *lowerdev = vlan->lowerdev;
913 
914 	vlan_vid_del(lowerdev, proto, vid);
915 	return 0;
916 }
917 
918 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
919 			   struct net_device *dev,
920 			   const unsigned char *addr, u16 vid,
921 			   u16 flags)
922 {
923 	struct macvlan_dev *vlan = netdev_priv(dev);
924 	int err = -EINVAL;
925 
926 	/* Support unicast filter only on passthru devices.
927 	 * Multicast filter should be allowed on all devices.
928 	 */
929 	if (!vlan->port->passthru && is_unicast_ether_addr(addr))
930 		return -EOPNOTSUPP;
931 
932 	if (flags & NLM_F_REPLACE)
933 		return -EOPNOTSUPP;
934 
935 	if (is_unicast_ether_addr(addr))
936 		err = dev_uc_add_excl(dev, addr);
937 	else if (is_multicast_ether_addr(addr))
938 		err = dev_mc_add_excl(dev, addr);
939 
940 	return err;
941 }
942 
943 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
944 			   struct net_device *dev,
945 			   const unsigned char *addr, u16 vid)
946 {
947 	struct macvlan_dev *vlan = netdev_priv(dev);
948 	int err = -EINVAL;
949 
950 	/* Support unicast filter only on passthru devices.
951 	 * Multicast filter should be allowed on all devices.
952 	 */
953 	if (!vlan->port->passthru && is_unicast_ether_addr(addr))
954 		return -EOPNOTSUPP;
955 
956 	if (is_unicast_ether_addr(addr))
957 		err = dev_uc_del(dev, addr);
958 	else if (is_multicast_ether_addr(addr))
959 		err = dev_mc_del(dev, addr);
960 
961 	return err;
962 }
963 
964 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
965 					struct ethtool_drvinfo *drvinfo)
966 {
967 	strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
968 	strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
969 }
970 
971 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
972 					      struct ethtool_link_ksettings *cmd)
973 {
974 	const struct macvlan_dev *vlan = netdev_priv(dev);
975 
976 	return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
977 }
978 
979 static netdev_features_t macvlan_fix_features(struct net_device *dev,
980 					      netdev_features_t features)
981 {
982 	struct macvlan_dev *vlan = netdev_priv(dev);
983 	netdev_features_t lowerdev_features = vlan->lowerdev->features;
984 	netdev_features_t mask;
985 
986 	features |= NETIF_F_ALL_FOR_ALL;
987 	features &= (vlan->set_features | ~MACVLAN_FEATURES);
988 	mask = features;
989 
990 	lowerdev_features &= (features | ~NETIF_F_LRO);
991 	features = netdev_increment_features(lowerdev_features, features, mask);
992 	features |= ALWAYS_ON_FEATURES;
993 	features &= ~NETIF_F_NETNS_LOCAL;
994 
995 	return features;
996 }
997 
998 #ifdef CONFIG_NET_POLL_CONTROLLER
999 static void macvlan_dev_poll_controller(struct net_device *dev)
1000 {
1001 	return;
1002 }
1003 
1004 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1005 {
1006 	struct macvlan_dev *vlan = netdev_priv(dev);
1007 	struct net_device *real_dev = vlan->lowerdev;
1008 	struct netpoll *netpoll;
1009 	int err = 0;
1010 
1011 	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1012 	err = -ENOMEM;
1013 	if (!netpoll)
1014 		goto out;
1015 
1016 	err = __netpoll_setup(netpoll, real_dev);
1017 	if (err) {
1018 		kfree(netpoll);
1019 		goto out;
1020 	}
1021 
1022 	vlan->netpoll = netpoll;
1023 
1024 out:
1025 	return err;
1026 }
1027 
1028 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1029 {
1030 	struct macvlan_dev *vlan = netdev_priv(dev);
1031 	struct netpoll *netpoll = vlan->netpoll;
1032 
1033 	if (!netpoll)
1034 		return;
1035 
1036 	vlan->netpoll = NULL;
1037 
1038 	__netpoll_free_async(netpoll);
1039 }
1040 #endif	/* CONFIG_NET_POLL_CONTROLLER */
1041 
1042 static int macvlan_dev_get_iflink(const struct net_device *dev)
1043 {
1044 	struct macvlan_dev *vlan = netdev_priv(dev);
1045 
1046 	return vlan->lowerdev->ifindex;
1047 }
1048 
1049 static const struct ethtool_ops macvlan_ethtool_ops = {
1050 	.get_link		= ethtool_op_get_link,
1051 	.get_link_ksettings	= macvlan_ethtool_get_link_ksettings,
1052 	.get_drvinfo		= macvlan_ethtool_get_drvinfo,
1053 };
1054 
1055 static const struct net_device_ops macvlan_netdev_ops = {
1056 	.ndo_init		= macvlan_init,
1057 	.ndo_uninit		= macvlan_uninit,
1058 	.ndo_open		= macvlan_open,
1059 	.ndo_stop		= macvlan_stop,
1060 	.ndo_start_xmit		= macvlan_start_xmit,
1061 	.ndo_change_mtu		= macvlan_change_mtu,
1062 	.ndo_fix_features	= macvlan_fix_features,
1063 	.ndo_change_rx_flags	= macvlan_change_rx_flags,
1064 	.ndo_set_mac_address	= macvlan_set_mac_address,
1065 	.ndo_set_rx_mode	= macvlan_set_mac_lists,
1066 	.ndo_get_stats64	= macvlan_dev_get_stats64,
1067 	.ndo_validate_addr	= eth_validate_addr,
1068 	.ndo_vlan_rx_add_vid	= macvlan_vlan_rx_add_vid,
1069 	.ndo_vlan_rx_kill_vid	= macvlan_vlan_rx_kill_vid,
1070 	.ndo_fdb_add		= macvlan_fdb_add,
1071 	.ndo_fdb_del		= macvlan_fdb_del,
1072 	.ndo_fdb_dump		= ndo_dflt_fdb_dump,
1073 	.ndo_get_lock_subclass  = macvlan_get_nest_level,
1074 #ifdef CONFIG_NET_POLL_CONTROLLER
1075 	.ndo_poll_controller	= macvlan_dev_poll_controller,
1076 	.ndo_netpoll_setup	= macvlan_dev_netpoll_setup,
1077 	.ndo_netpoll_cleanup	= macvlan_dev_netpoll_cleanup,
1078 #endif
1079 	.ndo_get_iflink		= macvlan_dev_get_iflink,
1080 	.ndo_features_check	= passthru_features_check,
1081 };
1082 
1083 void macvlan_common_setup(struct net_device *dev)
1084 {
1085 	ether_setup(dev);
1086 
1087 	dev->min_mtu		= 0;
1088 	dev->max_mtu		= ETH_MAX_MTU;
1089 	dev->priv_flags	       &= ~IFF_TX_SKB_SHARING;
1090 	netif_keep_dst(dev);
1091 	dev->priv_flags	       |= IFF_UNICAST_FLT;
1092 	dev->netdev_ops		= &macvlan_netdev_ops;
1093 	dev->destructor		= free_netdev;
1094 	dev->header_ops		= &macvlan_hard_header_ops;
1095 	dev->ethtool_ops	= &macvlan_ethtool_ops;
1096 }
1097 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1098 
1099 static void macvlan_setup(struct net_device *dev)
1100 {
1101 	macvlan_common_setup(dev);
1102 	dev->priv_flags |= IFF_NO_QUEUE;
1103 }
1104 
1105 static int macvlan_port_create(struct net_device *dev)
1106 {
1107 	struct macvlan_port *port;
1108 	unsigned int i;
1109 	int err;
1110 
1111 	if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1112 		return -EINVAL;
1113 
1114 	if (netif_is_ipvlan_port(dev))
1115 		return -EBUSY;
1116 
1117 	port = kzalloc(sizeof(*port), GFP_KERNEL);
1118 	if (port == NULL)
1119 		return -ENOMEM;
1120 
1121 	port->passthru = false;
1122 	port->dev = dev;
1123 	INIT_LIST_HEAD(&port->vlans);
1124 	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1125 		INIT_HLIST_HEAD(&port->vlan_hash[i]);
1126 	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1127 		INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1128 
1129 	skb_queue_head_init(&port->bc_queue);
1130 	INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1131 
1132 	err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1133 	if (err)
1134 		kfree(port);
1135 	else
1136 		dev->priv_flags |= IFF_MACVLAN_PORT;
1137 	return err;
1138 }
1139 
1140 static void macvlan_port_destroy(struct net_device *dev)
1141 {
1142 	struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1143 
1144 	dev->priv_flags &= ~IFF_MACVLAN_PORT;
1145 	netdev_rx_handler_unregister(dev);
1146 
1147 	/* After this point, no packet can schedule bc_work anymore,
1148 	 * but we need to cancel it and purge left skbs if any.
1149 	 */
1150 	cancel_work_sync(&port->bc_work);
1151 	__skb_queue_purge(&port->bc_queue);
1152 
1153 	kfree(port);
1154 }
1155 
1156 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1157 {
1158 	if (tb[IFLA_ADDRESS]) {
1159 		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1160 			return -EINVAL;
1161 		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1162 			return -EADDRNOTAVAIL;
1163 	}
1164 
1165 	if (data && data[IFLA_MACVLAN_FLAGS] &&
1166 	    nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1167 		return -EINVAL;
1168 
1169 	if (data && data[IFLA_MACVLAN_MODE]) {
1170 		switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1171 		case MACVLAN_MODE_PRIVATE:
1172 		case MACVLAN_MODE_VEPA:
1173 		case MACVLAN_MODE_BRIDGE:
1174 		case MACVLAN_MODE_PASSTHRU:
1175 		case MACVLAN_MODE_SOURCE:
1176 			break;
1177 		default:
1178 			return -EINVAL;
1179 		}
1180 	}
1181 
1182 	if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1183 		switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1184 		case MACVLAN_MACADDR_ADD:
1185 		case MACVLAN_MACADDR_DEL:
1186 		case MACVLAN_MACADDR_FLUSH:
1187 		case MACVLAN_MACADDR_SET:
1188 			break;
1189 		default:
1190 			return -EINVAL;
1191 		}
1192 	}
1193 
1194 	if (data && data[IFLA_MACVLAN_MACADDR]) {
1195 		if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1196 			return -EINVAL;
1197 
1198 		if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1199 			return -EADDRNOTAVAIL;
1200 	}
1201 
1202 	if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1203 		return -EINVAL;
1204 
1205 	return 0;
1206 }
1207 
1208 /**
1209  * reconfigure list of remote source mac address
1210  * (only for macvlan devices in source mode)
1211  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1212  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1213  */
1214 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1215 				      struct nlattr *data[])
1216 {
1217 	char *addr = NULL;
1218 	int ret, rem, len;
1219 	struct nlattr *nla, *head;
1220 	struct macvlan_source_entry *entry;
1221 
1222 	if (data[IFLA_MACVLAN_MACADDR])
1223 		addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1224 
1225 	if (mode == MACVLAN_MACADDR_ADD) {
1226 		if (!addr)
1227 			return -EINVAL;
1228 
1229 		return macvlan_hash_add_source(vlan, addr);
1230 
1231 	} else if (mode == MACVLAN_MACADDR_DEL) {
1232 		if (!addr)
1233 			return -EINVAL;
1234 
1235 		entry = macvlan_hash_lookup_source(vlan, addr);
1236 		if (entry) {
1237 			macvlan_hash_del_source(entry);
1238 			vlan->macaddr_count--;
1239 		}
1240 	} else if (mode == MACVLAN_MACADDR_FLUSH) {
1241 		macvlan_flush_sources(vlan->port, vlan);
1242 	} else if (mode == MACVLAN_MACADDR_SET) {
1243 		macvlan_flush_sources(vlan->port, vlan);
1244 
1245 		if (addr) {
1246 			ret = macvlan_hash_add_source(vlan, addr);
1247 			if (ret)
1248 				return ret;
1249 		}
1250 
1251 		if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1252 			return 0;
1253 
1254 		head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1255 		len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1256 
1257 		nla_for_each_attr(nla, head, len, rem) {
1258 			if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1259 			    nla_len(nla) != ETH_ALEN)
1260 				continue;
1261 
1262 			addr = nla_data(nla);
1263 			ret = macvlan_hash_add_source(vlan, addr);
1264 			if (ret)
1265 				return ret;
1266 		}
1267 	} else {
1268 		return -EINVAL;
1269 	}
1270 
1271 	return 0;
1272 }
1273 
1274 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1275 			   struct nlattr *tb[], struct nlattr *data[])
1276 {
1277 	struct macvlan_dev *vlan = netdev_priv(dev);
1278 	struct macvlan_port *port;
1279 	struct net_device *lowerdev;
1280 	int err;
1281 	int macmode;
1282 	bool create = false;
1283 
1284 	if (!tb[IFLA_LINK])
1285 		return -EINVAL;
1286 
1287 	lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1288 	if (lowerdev == NULL)
1289 		return -ENODEV;
1290 
1291 	/* When creating macvlans or macvtaps on top of other macvlans - use
1292 	 * the real device as the lowerdev.
1293 	 */
1294 	if (netif_is_macvlan(lowerdev))
1295 		lowerdev = macvlan_dev_real_dev(lowerdev);
1296 
1297 	if (!tb[IFLA_MTU])
1298 		dev->mtu = lowerdev->mtu;
1299 	else if (dev->mtu > lowerdev->mtu)
1300 		return -EINVAL;
1301 
1302 	/* MTU range: 68 - lowerdev->max_mtu */
1303 	dev->min_mtu = ETH_MIN_MTU;
1304 	dev->max_mtu = lowerdev->max_mtu;
1305 
1306 	if (!tb[IFLA_ADDRESS])
1307 		eth_hw_addr_random(dev);
1308 
1309 	if (!macvlan_port_exists(lowerdev)) {
1310 		err = macvlan_port_create(lowerdev);
1311 		if (err < 0)
1312 			return err;
1313 		create = true;
1314 	}
1315 	port = macvlan_port_get_rtnl(lowerdev);
1316 
1317 	/* Only 1 macvlan device can be created in passthru mode */
1318 	if (port->passthru) {
1319 		/* The macvlan port must be not created this time,
1320 		 * still goto destroy_macvlan_port for readability.
1321 		 */
1322 		err = -EINVAL;
1323 		goto destroy_macvlan_port;
1324 	}
1325 
1326 	vlan->lowerdev = lowerdev;
1327 	vlan->dev      = dev;
1328 	vlan->port     = port;
1329 	vlan->set_features = MACVLAN_FEATURES;
1330 	vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1331 
1332 	vlan->mode     = MACVLAN_MODE_VEPA;
1333 	if (data && data[IFLA_MACVLAN_MODE])
1334 		vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1335 
1336 	if (data && data[IFLA_MACVLAN_FLAGS])
1337 		vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1338 
1339 	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1340 		if (port->count) {
1341 			err = -EINVAL;
1342 			goto destroy_macvlan_port;
1343 		}
1344 		port->passthru = true;
1345 		eth_hw_addr_inherit(dev, lowerdev);
1346 	}
1347 
1348 	if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1349 		if (vlan->mode != MACVLAN_MODE_SOURCE) {
1350 			err = -EINVAL;
1351 			goto destroy_macvlan_port;
1352 		}
1353 		macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1354 		err = macvlan_changelink_sources(vlan, macmode, data);
1355 		if (err)
1356 			goto destroy_macvlan_port;
1357 	}
1358 
1359 	err = register_netdevice(dev);
1360 	if (err < 0)
1361 		goto destroy_macvlan_port;
1362 
1363 	dev->priv_flags |= IFF_MACVLAN;
1364 	err = netdev_upper_dev_link(lowerdev, dev);
1365 	if (err)
1366 		goto unregister_netdev;
1367 
1368 	list_add_tail_rcu(&vlan->list, &port->vlans);
1369 	netif_stacked_transfer_operstate(lowerdev, dev);
1370 	linkwatch_fire_event(dev);
1371 
1372 	return 0;
1373 
1374 unregister_netdev:
1375 	unregister_netdevice(dev);
1376 destroy_macvlan_port:
1377 	if (create)
1378 		macvlan_port_destroy(port->dev);
1379 	return err;
1380 }
1381 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1382 
1383 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1384 			   struct nlattr *tb[], struct nlattr *data[])
1385 {
1386 	return macvlan_common_newlink(src_net, dev, tb, data);
1387 }
1388 
1389 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1390 {
1391 	struct macvlan_dev *vlan = netdev_priv(dev);
1392 
1393 	if (vlan->mode == MACVLAN_MODE_SOURCE)
1394 		macvlan_flush_sources(vlan->port, vlan);
1395 	list_del_rcu(&vlan->list);
1396 	unregister_netdevice_queue(dev, head);
1397 	netdev_upper_dev_unlink(vlan->lowerdev, dev);
1398 }
1399 EXPORT_SYMBOL_GPL(macvlan_dellink);
1400 
1401 static int macvlan_changelink(struct net_device *dev,
1402 		struct nlattr *tb[], struct nlattr *data[])
1403 {
1404 	struct macvlan_dev *vlan = netdev_priv(dev);
1405 	enum macvlan_mode mode;
1406 	bool set_mode = false;
1407 	enum macvlan_macaddr_mode macmode;
1408 	int ret;
1409 
1410 	/* Validate mode, but don't set yet: setting flags may fail. */
1411 	if (data && data[IFLA_MACVLAN_MODE]) {
1412 		set_mode = true;
1413 		mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1414 		/* Passthrough mode can't be set or cleared dynamically */
1415 		if ((mode == MACVLAN_MODE_PASSTHRU) !=
1416 		    (vlan->mode == MACVLAN_MODE_PASSTHRU))
1417 			return -EINVAL;
1418 		if (vlan->mode == MACVLAN_MODE_SOURCE &&
1419 		    vlan->mode != mode)
1420 			macvlan_flush_sources(vlan->port, vlan);
1421 	}
1422 
1423 	if (data && data[IFLA_MACVLAN_FLAGS]) {
1424 		__u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1425 		bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1426 		if (vlan->port->passthru && promisc) {
1427 			int err;
1428 
1429 			if (flags & MACVLAN_FLAG_NOPROMISC)
1430 				err = dev_set_promiscuity(vlan->lowerdev, -1);
1431 			else
1432 				err = dev_set_promiscuity(vlan->lowerdev, 1);
1433 			if (err < 0)
1434 				return err;
1435 		}
1436 		vlan->flags = flags;
1437 	}
1438 	if (set_mode)
1439 		vlan->mode = mode;
1440 	if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1441 		if (vlan->mode != MACVLAN_MODE_SOURCE)
1442 			return -EINVAL;
1443 		macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1444 		ret = macvlan_changelink_sources(vlan, macmode, data);
1445 		if (ret)
1446 			return ret;
1447 	}
1448 	return 0;
1449 }
1450 
1451 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1452 {
1453 	if (vlan->macaddr_count == 0)
1454 		return 0;
1455 	return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1456 		+ vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1457 }
1458 
1459 static size_t macvlan_get_size(const struct net_device *dev)
1460 {
1461 	struct macvlan_dev *vlan = netdev_priv(dev);
1462 
1463 	return (0
1464 		+ nla_total_size(4) /* IFLA_MACVLAN_MODE */
1465 		+ nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1466 		+ nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1467 		+ macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1468 		);
1469 }
1470 
1471 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1472 				     const struct macvlan_dev *vlan,
1473 				     const int i)
1474 {
1475 	struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1476 	struct macvlan_source_entry *entry;
1477 
1478 	hlist_for_each_entry_rcu(entry, h, hlist) {
1479 		if (entry->vlan != vlan)
1480 			continue;
1481 		if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1482 			return 1;
1483 	}
1484 	return 0;
1485 }
1486 
1487 static int macvlan_fill_info(struct sk_buff *skb,
1488 				const struct net_device *dev)
1489 {
1490 	struct macvlan_dev *vlan = netdev_priv(dev);
1491 	int i;
1492 	struct nlattr *nest;
1493 
1494 	if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1495 		goto nla_put_failure;
1496 	if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1497 		goto nla_put_failure;
1498 	if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1499 		goto nla_put_failure;
1500 	if (vlan->macaddr_count > 0) {
1501 		nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1502 		if (nest == NULL)
1503 			goto nla_put_failure;
1504 
1505 		for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1506 			if (macvlan_fill_info_macaddr(skb, vlan, i))
1507 				goto nla_put_failure;
1508 		}
1509 		nla_nest_end(skb, nest);
1510 	}
1511 	return 0;
1512 
1513 nla_put_failure:
1514 	return -EMSGSIZE;
1515 }
1516 
1517 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1518 	[IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1519 	[IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1520 	[IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1521 	[IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1522 	[IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1523 	[IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1524 };
1525 
1526 int macvlan_link_register(struct rtnl_link_ops *ops)
1527 {
1528 	/* common fields */
1529 	ops->priv_size		= sizeof(struct macvlan_dev);
1530 	ops->validate		= macvlan_validate;
1531 	ops->maxtype		= IFLA_MACVLAN_MAX;
1532 	ops->policy		= macvlan_policy;
1533 	ops->changelink		= macvlan_changelink;
1534 	ops->get_size		= macvlan_get_size;
1535 	ops->fill_info		= macvlan_fill_info;
1536 
1537 	return rtnl_link_register(ops);
1538 };
1539 EXPORT_SYMBOL_GPL(macvlan_link_register);
1540 
1541 static struct net *macvlan_get_link_net(const struct net_device *dev)
1542 {
1543 	return dev_net(macvlan_dev_real_dev(dev));
1544 }
1545 
1546 static struct rtnl_link_ops macvlan_link_ops = {
1547 	.kind		= "macvlan",
1548 	.setup		= macvlan_setup,
1549 	.newlink	= macvlan_newlink,
1550 	.dellink	= macvlan_dellink,
1551 	.get_link_net	= macvlan_get_link_net,
1552 };
1553 
1554 static int macvlan_device_event(struct notifier_block *unused,
1555 				unsigned long event, void *ptr)
1556 {
1557 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1558 	struct macvlan_dev *vlan, *next;
1559 	struct macvlan_port *port;
1560 	LIST_HEAD(list_kill);
1561 
1562 	if (!macvlan_port_exists(dev))
1563 		return NOTIFY_DONE;
1564 
1565 	port = macvlan_port_get_rtnl(dev);
1566 
1567 	switch (event) {
1568 	case NETDEV_UP:
1569 	case NETDEV_CHANGE:
1570 		list_for_each_entry(vlan, &port->vlans, list)
1571 			netif_stacked_transfer_operstate(vlan->lowerdev,
1572 							 vlan->dev);
1573 		break;
1574 	case NETDEV_FEAT_CHANGE:
1575 		list_for_each_entry(vlan, &port->vlans, list) {
1576 			vlan->dev->gso_max_size = dev->gso_max_size;
1577 			vlan->dev->gso_max_segs = dev->gso_max_segs;
1578 			netdev_update_features(vlan->dev);
1579 		}
1580 		break;
1581 	case NETDEV_CHANGEMTU:
1582 		list_for_each_entry(vlan, &port->vlans, list) {
1583 			if (vlan->dev->mtu <= dev->mtu)
1584 				continue;
1585 			dev_set_mtu(vlan->dev, dev->mtu);
1586 		}
1587 		break;
1588 	case NETDEV_CHANGEADDR:
1589 		if (!port->passthru)
1590 			return NOTIFY_DONE;
1591 
1592 		vlan = list_first_entry_or_null(&port->vlans,
1593 						struct macvlan_dev,
1594 						list);
1595 
1596 		if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1597 			return NOTIFY_BAD;
1598 
1599 		break;
1600 	case NETDEV_UNREGISTER:
1601 		/* twiddle thumbs on netns device moves */
1602 		if (dev->reg_state != NETREG_UNREGISTERING)
1603 			break;
1604 
1605 		list_for_each_entry_safe(vlan, next, &port->vlans, list)
1606 			vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1607 		unregister_netdevice_many(&list_kill);
1608 		break;
1609 	case NETDEV_PRE_TYPE_CHANGE:
1610 		/* Forbid underlaying device to change its type. */
1611 		return NOTIFY_BAD;
1612 
1613 	case NETDEV_NOTIFY_PEERS:
1614 	case NETDEV_BONDING_FAILOVER:
1615 	case NETDEV_RESEND_IGMP:
1616 		/* Propagate to all vlans */
1617 		list_for_each_entry(vlan, &port->vlans, list)
1618 			call_netdevice_notifiers(event, vlan->dev);
1619 	}
1620 	return NOTIFY_DONE;
1621 }
1622 
1623 static struct notifier_block macvlan_notifier_block __read_mostly = {
1624 	.notifier_call	= macvlan_device_event,
1625 };
1626 
1627 static int __init macvlan_init_module(void)
1628 {
1629 	int err;
1630 
1631 	register_netdevice_notifier(&macvlan_notifier_block);
1632 
1633 	err = macvlan_link_register(&macvlan_link_ops);
1634 	if (err < 0)
1635 		goto err1;
1636 	return 0;
1637 err1:
1638 	unregister_netdevice_notifier(&macvlan_notifier_block);
1639 	return err;
1640 }
1641 
1642 static void __exit macvlan_cleanup_module(void)
1643 {
1644 	rtnl_link_unregister(&macvlan_link_ops);
1645 	unregister_netdevice_notifier(&macvlan_notifier_block);
1646 }
1647 
1648 module_init(macvlan_init_module);
1649 module_exit(macvlan_cleanup_module);
1650 
1651 MODULE_LICENSE("GPL");
1652 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1653 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1654 MODULE_ALIAS_RTNL_LINK("macvlan");
1655