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_link.h>
 30#include <linux/if_macvlan.h>
 
 
 31#include <net/rtnetlink.h>
 32#include <net/xfrm.h>
 
 33
 34#define MACVLAN_HASH_SIZE	(1 << BITS_PER_BYTE)
 
 
 35
 36struct macvlan_port {
 37	struct net_device	*dev;
 38	struct hlist_head	vlan_hash[MACVLAN_HASH_SIZE];
 39	struct list_head	vlans;
 40	struct rcu_head		rcu;
 
 
 41	bool 			passthru;
 42	int			count;
 
 43};
 44
 
 
 
 
 
 
 
 
 
 
 
 
 
 45static void macvlan_port_destroy(struct net_device *dev);
 46
 47#define macvlan_port_get_rcu(dev) \
 48	((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
 49#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 50#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
 51
 52static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 53					       const unsigned char *addr)
 54{
 55	struct macvlan_dev *vlan;
 56	struct hlist_node *n;
 57
 58	hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
 59		if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
 60			return vlan;
 61	}
 62	return NULL;
 63}
 64
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 65static void macvlan_hash_add(struct macvlan_dev *vlan)
 66{
 67	struct macvlan_port *port = vlan->port;
 68	const unsigned char *addr = vlan->dev->dev_addr;
 
 69
 70	hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
 
 
 
 
 
 
 71}
 72
 73static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 74{
 75	hlist_del_rcu(&vlan->hlist);
 76	if (sync)
 77		synchronize_rcu();
 78}
 79
 80static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 81					const unsigned char *addr)
 82{
 83	macvlan_hash_del(vlan, true);
 84	/* Now that we are unhashed it is safe to change the device
 85	 * address without confusing packet delivery.
 86	 */
 87	memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
 88	macvlan_hash_add(vlan);
 89}
 90
 91static int macvlan_addr_busy(const struct macvlan_port *port,
 92				const unsigned char *addr)
 93{
 94	/* Test to see if the specified multicast address is
 95	 * currently in use by the underlying device or
 96	 * another macvlan.
 97	 */
 98	if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
 99		return 1;
100
101	if (macvlan_hash_lookup(port, addr))
102		return 1;
103
104	return 0;
105}
106
107
108static int macvlan_broadcast_one(struct sk_buff *skb,
109				 const struct macvlan_dev *vlan,
110				 const struct ethhdr *eth, bool local)
111{
112	struct net_device *dev = vlan->dev;
113	if (!skb)
114		return NET_RX_DROP;
115
116	if (local)
117		return vlan->forward(dev, skb);
118
119	skb->dev = dev;
120	if (!compare_ether_addr_64bits(eth->h_dest,
121				       dev->broadcast))
122		skb->pkt_type = PACKET_BROADCAST;
123	else
124		skb->pkt_type = PACKET_MULTICAST;
125
126	return vlan->receive(skb);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
127}
128
129static void macvlan_broadcast(struct sk_buff *skb,
130			      const struct macvlan_port *port,
131			      struct net_device *src,
132			      enum macvlan_mode mode)
133{
134	const struct ethhdr *eth = eth_hdr(skb);
135	const struct macvlan_dev *vlan;
136	struct hlist_node *n;
137	struct sk_buff *nskb;
138	unsigned int i;
139	int err;
 
140
141	if (skb->protocol == htons(ETH_P_PAUSE))
142		return;
143
144	for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
145		hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
146			if (vlan->dev == src || !(vlan->mode & mode))
147				continue;
148
 
 
 
 
 
149			nskb = skb_clone(skb, GFP_ATOMIC);
150			err = macvlan_broadcast_one(nskb, vlan, eth,
151					 mode == MACVLAN_MODE_BRIDGE);
 
 
 
152			macvlan_count_rx(vlan, skb->len + ETH_HLEN,
153					 err == NET_RX_SUCCESS, 1);
154		}
155	}
156}
157
158/* called under rcu_read_lock() from netif_receive_skb */
159static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
160{
161	struct macvlan_port *port;
162	struct sk_buff *skb = *pskb;
163	const struct ethhdr *eth = eth_hdr(skb);
164	const struct macvlan_dev *vlan;
165	const struct macvlan_dev *src;
166	struct net_device *dev;
167	unsigned int len = 0;
168	int ret = NET_RX_DROP;
 
 
 
 
 
 
 
169
170	port = macvlan_port_get_rcu(skb->dev);
171	if (is_multicast_ether_addr(eth->h_dest)) {
172		src = macvlan_hash_lookup(port, eth->h_source);
173		if (!src)
174			/* frame comes from an external address */
175			macvlan_broadcast(skb, port, NULL,
176					  MACVLAN_MODE_PRIVATE |
177					  MACVLAN_MODE_VEPA    |
178					  MACVLAN_MODE_PASSTHRU|
179					  MACVLAN_MODE_BRIDGE);
180		else if (src->mode == MACVLAN_MODE_VEPA)
181			/* flood to everyone except source */
182			macvlan_broadcast(skb, port, src->dev,
183					  MACVLAN_MODE_VEPA |
184					  MACVLAN_MODE_BRIDGE);
185		else if (src->mode == MACVLAN_MODE_BRIDGE)
186			/*
187			 * flood only to VEPA ports, bridge ports
188			 * already saw the frame on the way out.
189			 */
190			macvlan_broadcast(skb, port, src->dev,
191					  MACVLAN_MODE_VEPA);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
192		return RX_HANDLER_PASS;
193	}
194
 
195	if (port->passthru)
196		vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
 
197	else
198		vlan = macvlan_hash_lookup(port, eth->h_dest);
199	if (vlan == NULL)
200		return RX_HANDLER_PASS;
201
202	dev = vlan->dev;
203	if (unlikely(!(dev->flags & IFF_UP))) {
204		kfree_skb(skb);
205		return RX_HANDLER_CONSUMED;
206	}
207	len = skb->len + ETH_HLEN;
208	skb = skb_share_check(skb, GFP_ATOMIC);
209	if (!skb)
 
 
210		goto out;
 
211
 
212	skb->dev = dev;
213	skb->pkt_type = PACKET_HOST;
214
215	ret = vlan->receive(skb);
216
217out:
218	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
219	return RX_HANDLER_CONSUMED;
220}
221
222static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
223{
224	const struct macvlan_dev *vlan = netdev_priv(dev);
225	const struct macvlan_port *port = vlan->port;
226	const struct macvlan_dev *dest;
227	__u8 ip_summed = skb->ip_summed;
228
229	if (vlan->mode == MACVLAN_MODE_BRIDGE) {
230		const struct ethhdr *eth = (void *)skb->data;
231		skb->ip_summed = CHECKSUM_UNNECESSARY;
232
233		/* send to other bridge ports directly */
234		if (is_multicast_ether_addr(eth->h_dest)) {
235			macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
236			goto xmit_world;
237		}
238
239		dest = macvlan_hash_lookup(port, eth->h_dest);
240		if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
241			/* send to lowerdev first for its network taps */
242			dev_forward_skb(vlan->lowerdev, skb);
243
244			return NET_XMIT_SUCCESS;
245		}
246	}
247
248xmit_world:
249	skb->ip_summed = ip_summed;
250	skb_set_dev(skb, vlan->lowerdev);
251	return dev_queue_xmit(skb);
252}
253
254netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
255			       struct net_device *dev)
 
 
 
 
 
 
 
 
 
 
 
256{
257	unsigned int len = skb->len;
258	int ret;
259	const struct macvlan_dev *vlan = netdev_priv(dev);
 
 
 
 
 
 
 
 
 
 
260
261	ret = macvlan_queue_xmit(skb, dev);
262	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
263		struct macvlan_pcpu_stats *pcpu_stats;
264
265		pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
266		u64_stats_update_begin(&pcpu_stats->syncp);
267		pcpu_stats->tx_packets++;
268		pcpu_stats->tx_bytes += len;
269		u64_stats_update_end(&pcpu_stats->syncp);
270	} else {
271		this_cpu_inc(vlan->pcpu_stats->tx_dropped);
272	}
273	return ret;
274}
275EXPORT_SYMBOL_GPL(macvlan_start_xmit);
276
277static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
278			       unsigned short type, const void *daddr,
279			       const void *saddr, unsigned len)
280{
281	const struct macvlan_dev *vlan = netdev_priv(dev);
282	struct net_device *lowerdev = vlan->lowerdev;
283
284	return dev_hard_header(skb, lowerdev, type, daddr,
285			       saddr ? : dev->dev_addr, len);
286}
287
288static const struct header_ops macvlan_hard_header_ops = {
289	.create  	= macvlan_hard_header,
290	.rebuild	= eth_rebuild_header,
291	.parse		= eth_header_parse,
292	.cache		= eth_header_cache,
293	.cache_update	= eth_header_cache_update,
294};
295
 
 
296static int macvlan_open(struct net_device *dev)
297{
298	struct macvlan_dev *vlan = netdev_priv(dev);
299	struct net_device *lowerdev = vlan->lowerdev;
300	int err;
301
302	if (vlan->port->passthru) {
303		dev_set_promiscuity(lowerdev, 1);
 
 
 
 
304		goto hash_add;
305	}
306
 
 
 
 
 
 
 
 
 
 
 
 
 
 
307	err = -EBUSY;
308	if (macvlan_addr_busy(vlan->port, dev->dev_addr))
309		goto out;
310
311	err = dev_uc_add(lowerdev, dev->dev_addr);
312	if (err < 0)
313		goto out;
314	if (dev->flags & IFF_ALLMULTI) {
315		err = dev_set_allmulti(lowerdev, 1);
316		if (err < 0)
317			goto del_unicast;
318	}
319
 
 
 
 
 
 
320hash_add:
321	macvlan_hash_add(vlan);
322	return 0;
323
 
 
324del_unicast:
325	dev_uc_del(lowerdev, dev->dev_addr);
326out:
 
 
 
 
 
327	return err;
328}
329
330static int macvlan_stop(struct net_device *dev)
331{
332	struct macvlan_dev *vlan = netdev_priv(dev);
333	struct net_device *lowerdev = vlan->lowerdev;
334
 
 
 
 
 
 
 
 
 
 
335	if (vlan->port->passthru) {
336		dev_set_promiscuity(lowerdev, -1);
 
337		goto hash_del;
338	}
339
340	dev_mc_unsync(lowerdev, dev);
341	if (dev->flags & IFF_ALLMULTI)
342		dev_set_allmulti(lowerdev, -1);
343
 
 
 
344	dev_uc_del(lowerdev, dev->dev_addr);
345
346hash_del:
347	macvlan_hash_del(vlan, !dev->dismantle);
348	return 0;
349}
350
351static int macvlan_set_mac_address(struct net_device *dev, void *p)
352{
353	struct macvlan_dev *vlan = netdev_priv(dev);
354	struct net_device *lowerdev = vlan->lowerdev;
355	struct sockaddr *addr = p;
356	int err;
357
358	if (!is_valid_ether_addr(addr->sa_data))
359		return -EADDRNOTAVAIL;
360
361	if (!(dev->flags & IFF_UP)) {
362		/* Just copy in the new address */
363		memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
364	} else {
365		/* Rehash and update the device filters */
366		if (macvlan_addr_busy(vlan->port, addr->sa_data))
367			return -EBUSY;
368
369		err = dev_uc_add(lowerdev, addr->sa_data);
370		if (err)
371			return err;
 
372
373		dev_uc_del(lowerdev, dev->dev_addr);
 
374
375		macvlan_hash_change_addr(vlan, addr->sa_data);
376	}
377	return 0;
378}
379
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
380static void macvlan_change_rx_flags(struct net_device *dev, int change)
381{
382	struct macvlan_dev *vlan = netdev_priv(dev);
383	struct net_device *lowerdev = vlan->lowerdev;
384
385	if (change & IFF_ALLMULTI)
386		dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 
 
 
 
 
 
387}
388
389static void macvlan_set_multicast_list(struct net_device *dev)
390{
391	struct macvlan_dev *vlan = netdev_priv(dev);
392
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
393	dev_mc_sync(vlan->lowerdev, dev);
394}
395
396static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
397{
398	struct macvlan_dev *vlan = netdev_priv(dev);
399
400	if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
401		return -EINVAL;
402	dev->mtu = new_mtu;
403	return 0;
404}
405
406/*
407 * macvlan network devices have devices nesting below it and are a special
408 * "super class" of normal network devices; split their locks off into a
409 * separate class since they always nest.
410 */
411static struct lock_class_key macvlan_netdev_xmit_lock_key;
412static struct lock_class_key macvlan_netdev_addr_lock_key;
413
 
 
 
 
414#define MACVLAN_FEATURES \
415	(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
416	 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
417	 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
418	 NETIF_F_HW_VLAN_FILTER)
419
420#define MACVLAN_STATE_MASK \
421	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
422
 
 
 
 
 
423static void macvlan_set_lockdep_class_one(struct net_device *dev,
424					  struct netdev_queue *txq,
425					  void *_unused)
426{
427	lockdep_set_class(&txq->_xmit_lock,
428			  &macvlan_netdev_xmit_lock_key);
429}
430
431static void macvlan_set_lockdep_class(struct net_device *dev)
432{
433	lockdep_set_class(&dev->addr_list_lock,
434			  &macvlan_netdev_addr_lock_key);
 
435	netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
436}
437
438static int macvlan_init(struct net_device *dev)
439{
440	struct macvlan_dev *vlan = netdev_priv(dev);
441	const struct net_device *lowerdev = vlan->lowerdev;
442
443	dev->state		= (dev->state & ~MACVLAN_STATE_MASK) |
444				  (lowerdev->state & MACVLAN_STATE_MASK);
445	dev->features 		= lowerdev->features & MACVLAN_FEATURES;
446	dev->features		|= NETIF_F_LLTX;
 
 
447	dev->gso_max_size	= lowerdev->gso_max_size;
448	dev->iflink		= lowerdev->ifindex;
449	dev->hard_header_len	= lowerdev->hard_header_len;
450
451	macvlan_set_lockdep_class(dev);
452
453	vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
454	if (!vlan->pcpu_stats)
455		return -ENOMEM;
456
457	return 0;
458}
459
460static void macvlan_uninit(struct net_device *dev)
461{
462	struct macvlan_dev *vlan = netdev_priv(dev);
463	struct macvlan_port *port = vlan->port;
464
465	free_percpu(vlan->pcpu_stats);
466
 
467	port->count -= 1;
468	if (!port->count)
469		macvlan_port_destroy(port->dev);
470}
471
472static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
473							 struct rtnl_link_stats64 *stats)
474{
475	struct macvlan_dev *vlan = netdev_priv(dev);
476
477	if (vlan->pcpu_stats) {
478		struct macvlan_pcpu_stats *p;
479		u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
480		u32 rx_errors = 0, tx_dropped = 0;
481		unsigned int start;
482		int i;
483
484		for_each_possible_cpu(i) {
485			p = per_cpu_ptr(vlan->pcpu_stats, i);
486			do {
487				start = u64_stats_fetch_begin_bh(&p->syncp);
488				rx_packets	= p->rx_packets;
489				rx_bytes	= p->rx_bytes;
490				rx_multicast	= p->rx_multicast;
491				tx_packets	= p->tx_packets;
492				tx_bytes	= p->tx_bytes;
493			} while (u64_stats_fetch_retry_bh(&p->syncp, start));
494
495			stats->rx_packets	+= rx_packets;
496			stats->rx_bytes		+= rx_bytes;
497			stats->multicast	+= rx_multicast;
498			stats->tx_packets	+= tx_packets;
499			stats->tx_bytes		+= tx_bytes;
500			/* rx_errors & tx_dropped are u32, updated
501			 * without syncp protection.
502			 */
503			rx_errors	+= p->rx_errors;
504			tx_dropped	+= p->tx_dropped;
505		}
506		stats->rx_errors	= rx_errors;
507		stats->rx_dropped	= rx_errors;
508		stats->tx_dropped	= tx_dropped;
509	}
510	return stats;
511}
512
513static void macvlan_vlan_rx_add_vid(struct net_device *dev,
514				    unsigned short vid)
515{
516	struct macvlan_dev *vlan = netdev_priv(dev);
517	struct net_device *lowerdev = vlan->lowerdev;
518	const struct net_device_ops *ops = lowerdev->netdev_ops;
519
520	if (ops->ndo_vlan_rx_add_vid)
521		ops->ndo_vlan_rx_add_vid(lowerdev, vid);
522}
523
524static void macvlan_vlan_rx_kill_vid(struct net_device *dev,
525				     unsigned short vid)
526{
527	struct macvlan_dev *vlan = netdev_priv(dev);
528	struct net_device *lowerdev = vlan->lowerdev;
529	const struct net_device_ops *ops = lowerdev->netdev_ops;
530
531	if (ops->ndo_vlan_rx_kill_vid)
532		ops->ndo_vlan_rx_kill_vid(lowerdev, vid);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
533}
534
535static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
536					struct ethtool_drvinfo *drvinfo)
537{
538	snprintf(drvinfo->driver, 32, "macvlan");
539	snprintf(drvinfo->version, 32, "0.1");
540}
541
542static int macvlan_ethtool_get_settings(struct net_device *dev,
543					struct ethtool_cmd *cmd)
544{
545	const struct macvlan_dev *vlan = netdev_priv(dev);
546	return dev_ethtool_get_settings(vlan->lowerdev, cmd);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
547}
548
549static const struct ethtool_ops macvlan_ethtool_ops = {
550	.get_link		= ethtool_op_get_link,
551	.get_settings		= macvlan_ethtool_get_settings,
552	.get_drvinfo		= macvlan_ethtool_get_drvinfo,
553};
554
555static const struct net_device_ops macvlan_netdev_ops = {
556	.ndo_init		= macvlan_init,
557	.ndo_uninit		= macvlan_uninit,
558	.ndo_open		= macvlan_open,
559	.ndo_stop		= macvlan_stop,
560	.ndo_start_xmit		= macvlan_start_xmit,
561	.ndo_change_mtu		= macvlan_change_mtu,
 
562	.ndo_change_rx_flags	= macvlan_change_rx_flags,
563	.ndo_set_mac_address	= macvlan_set_mac_address,
564	.ndo_set_multicast_list	= macvlan_set_multicast_list,
565	.ndo_get_stats64	= macvlan_dev_get_stats64,
566	.ndo_validate_addr	= eth_validate_addr,
567	.ndo_vlan_rx_add_vid	= macvlan_vlan_rx_add_vid,
568	.ndo_vlan_rx_kill_vid	= macvlan_vlan_rx_kill_vid,
 
 
 
 
 
 
 
 
 
 
 
569};
570
571void macvlan_common_setup(struct net_device *dev)
572{
573	ether_setup(dev);
574
575	dev->priv_flags	       &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 
 
576	dev->netdev_ops		= &macvlan_netdev_ops;
577	dev->destructor		= free_netdev;
578	dev->header_ops		= &macvlan_hard_header_ops,
579	dev->ethtool_ops	= &macvlan_ethtool_ops;
580}
581EXPORT_SYMBOL_GPL(macvlan_common_setup);
582
583static void macvlan_setup(struct net_device *dev)
584{
585	macvlan_common_setup(dev);
586	dev->tx_queue_len	= 0;
587}
588
589static int macvlan_port_create(struct net_device *dev)
590{
591	struct macvlan_port *port;
592	unsigned int i;
593	int err;
594
595	if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
596		return -EINVAL;
597
 
 
 
598	port = kzalloc(sizeof(*port), GFP_KERNEL);
599	if (port == NULL)
600		return -ENOMEM;
601
602	port->passthru = false;
603	port->dev = dev;
604	INIT_LIST_HEAD(&port->vlans);
605	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
606		INIT_HLIST_HEAD(&port->vlan_hash[i]);
 
 
 
 
 
607
608	err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
609	if (err)
610		kfree(port);
611	else
612		dev->priv_flags |= IFF_MACVLAN_PORT;
613	return err;
614}
615
616static void macvlan_port_destroy(struct net_device *dev)
617{
618	struct macvlan_port *port = macvlan_port_get(dev);
619
620	dev->priv_flags &= ~IFF_MACVLAN_PORT;
621	netdev_rx_handler_unregister(dev);
 
 
 
 
 
 
 
622	kfree_rcu(port, rcu);
623}
624
625static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
626{
627	if (tb[IFLA_ADDRESS]) {
628		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
629			return -EINVAL;
630		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
631			return -EADDRNOTAVAIL;
632	}
633
 
 
 
 
634	if (data && data[IFLA_MACVLAN_MODE]) {
635		switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
636		case MACVLAN_MODE_PRIVATE:
637		case MACVLAN_MODE_VEPA:
638		case MACVLAN_MODE_BRIDGE:
639		case MACVLAN_MODE_PASSTHRU:
 
640			break;
641		default:
642			return -EINVAL;
643		}
644	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
645	return 0;
646}
647
648int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
649			   struct nlattr *tb[], struct nlattr *data[],
650			   int (*receive)(struct sk_buff *skb),
651			   int (*forward)(struct net_device *dev,
652					  struct sk_buff *skb))
653{
654	struct macvlan_dev *vlan = netdev_priv(dev);
655	struct macvlan_port *port;
656	struct net_device *lowerdev;
657	int err;
 
658
659	if (!tb[IFLA_LINK])
660		return -EINVAL;
661
662	lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
663	if (lowerdev == NULL)
664		return -ENODEV;
665
666	/* When creating macvlans on top of other macvlans - use
667	 * the real device as the lowerdev.
668	 */
669	if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
670		struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
671		lowerdev = lowervlan->lowerdev;
672	}
673
674	if (!tb[IFLA_MTU])
675		dev->mtu = lowerdev->mtu;
676	else if (dev->mtu > lowerdev->mtu)
677		return -EINVAL;
678
679	if (!tb[IFLA_ADDRESS])
680		random_ether_addr(dev->dev_addr);
681
682	if (!macvlan_port_exists(lowerdev)) {
683		err = macvlan_port_create(lowerdev);
684		if (err < 0)
685			return err;
686	}
687	port = macvlan_port_get(lowerdev);
688
689	/* Only 1 macvlan device can be created in passthru mode */
690	if (port->passthru)
691		return -EINVAL;
692
693	vlan->lowerdev = lowerdev;
694	vlan->dev      = dev;
695	vlan->port     = port;
696	vlan->receive  = receive;
697	vlan->forward  = forward;
698
699	vlan->mode     = MACVLAN_MODE_VEPA;
700	if (data && data[IFLA_MACVLAN_MODE])
701		vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
702
 
 
 
703	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
704		if (port->count)
705			return -EINVAL;
706		port->passthru = true;
707		memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
 
 
 
 
 
 
 
 
 
708	}
709
710	port->count += 1;
711	err = register_netdevice(dev);
712	if (err < 0)
713		goto destroy_port;
714
715	list_add_tail(&vlan->list, &port->vlans);
 
 
 
 
 
716	netif_stacked_transfer_operstate(lowerdev, dev);
 
717
718	return 0;
719
 
 
720destroy_port:
721	port->count -= 1;
722	if (!port->count)
723		macvlan_port_destroy(lowerdev);
724
725	return err;
726}
727EXPORT_SYMBOL_GPL(macvlan_common_newlink);
728
729static int macvlan_newlink(struct net *src_net, struct net_device *dev,
730			   struct nlattr *tb[], struct nlattr *data[])
731{
732	return macvlan_common_newlink(src_net, dev, tb, data,
733				      netif_rx,
734				      dev_forward_skb);
735}
736
737void macvlan_dellink(struct net_device *dev, struct list_head *head)
738{
739	struct macvlan_dev *vlan = netdev_priv(dev);
740
741	list_del(&vlan->list);
 
 
742	unregister_netdevice_queue(dev, head);
 
743}
744EXPORT_SYMBOL_GPL(macvlan_dellink);
745
746static int macvlan_changelink(struct net_device *dev,
747		struct nlattr *tb[], struct nlattr *data[])
748{
749	struct macvlan_dev *vlan = netdev_priv(dev);
750	if (data && data[IFLA_MACVLAN_MODE])
751		vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
752	return 0;
753}
754
 
 
 
 
 
 
 
 
755static size_t macvlan_get_size(const struct net_device *dev)
756{
757	return nla_total_size(4);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
758}
759
760static int macvlan_fill_info(struct sk_buff *skb,
761				const struct net_device *dev)
762{
763	struct macvlan_dev *vlan = netdev_priv(dev);
 
 
764
765	NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
766	return 0;
767
768nla_put_failure:
769	return -EMSGSIZE;
770}
771
772static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
773	[IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
 
 
 
 
 
774};
775
776int macvlan_link_register(struct rtnl_link_ops *ops)
777{
778	/* common fields */
779	ops->priv_size		= sizeof(struct macvlan_dev);
780	ops->validate		= macvlan_validate;
781	ops->maxtype		= IFLA_MACVLAN_MAX;
782	ops->policy		= macvlan_policy;
783	ops->changelink		= macvlan_changelink;
784	ops->get_size		= macvlan_get_size;
785	ops->fill_info		= macvlan_fill_info;
786
787	return rtnl_link_register(ops);
788};
789EXPORT_SYMBOL_GPL(macvlan_link_register);
790
 
 
 
 
 
791static struct rtnl_link_ops macvlan_link_ops = {
792	.kind		= "macvlan",
793	.setup		= macvlan_setup,
794	.newlink	= macvlan_newlink,
795	.dellink	= macvlan_dellink,
 
796};
797
798static int macvlan_device_event(struct notifier_block *unused,
799				unsigned long event, void *ptr)
800{
801	struct net_device *dev = ptr;
802	struct macvlan_dev *vlan, *next;
803	struct macvlan_port *port;
804	LIST_HEAD(list_kill);
805
806	if (!macvlan_port_exists(dev))
807		return NOTIFY_DONE;
808
809	port = macvlan_port_get(dev);
810
811	switch (event) {
 
812	case NETDEV_CHANGE:
813		list_for_each_entry(vlan, &port->vlans, list)
814			netif_stacked_transfer_operstate(vlan->lowerdev,
815							 vlan->dev);
816		break;
817	case NETDEV_FEAT_CHANGE:
818		list_for_each_entry(vlan, &port->vlans, list) {
819			vlan->dev->features = dev->features & MACVLAN_FEATURES;
820			vlan->dev->gso_max_size = dev->gso_max_size;
821			netdev_features_change(vlan->dev);
 
 
 
 
 
 
 
 
822		}
823		break;
 
 
 
 
 
 
 
 
 
 
 
 
824	case NETDEV_UNREGISTER:
825		/* twiddle thumbs on netns device moves */
826		if (dev->reg_state != NETREG_UNREGISTERING)
827			break;
828
829		list_for_each_entry_safe(vlan, next, &port->vlans, list)
830			vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
831		unregister_netdevice_many(&list_kill);
832		list_del(&list_kill);
833		break;
834	case NETDEV_PRE_TYPE_CHANGE:
835		/* Forbid underlaying device to change its type. */
836		return NOTIFY_BAD;
 
 
 
 
 
 
 
837	}
838	return NOTIFY_DONE;
839}
840
841static struct notifier_block macvlan_notifier_block __read_mostly = {
842	.notifier_call	= macvlan_device_event,
843};
844
845static int __init macvlan_init_module(void)
846{
847	int err;
848
849	register_netdevice_notifier(&macvlan_notifier_block);
850
851	err = macvlan_link_register(&macvlan_link_ops);
852	if (err < 0)
853		goto err1;
854	return 0;
855err1:
856	unregister_netdevice_notifier(&macvlan_notifier_block);
857	return err;
858}
859
860static void __exit macvlan_cleanup_module(void)
861{
862	rtnl_link_unregister(&macvlan_link_ops);
863	unregister_netdevice_notifier(&macvlan_notifier_block);
864}
865
866module_init(macvlan_init_module);
867module_exit(macvlan_cleanup_module);
868
869MODULE_LICENSE("GPL");
870MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
871MODULE_DESCRIPTION("Driver for MAC address based VLANs");
872MODULE_ALIAS_RTNL_LINK("macvlan");