xref: /openbmc/linux/drivers/net/ipvlan/ipvlan_main.c (revision c819e2cf)
1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
2  *
3  * This program is free software; you can redistribute it and/or
4  * modify it under the terms of the GNU General Public License as
5  * published by the Free Software Foundation; either version 2 of
6  * the License, or (at your option) any later version.
7  *
8  */
9 
10 #include "ipvlan.h"
11 
12 void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
13 {
14 	ipvlan->dev->mtu = dev->mtu - ipvlan->mtu_adj;
15 }
16 
17 void ipvlan_set_port_mode(struct ipvl_port *port, u32 nval)
18 {
19 	struct ipvl_dev *ipvlan;
20 
21 	if (port->mode != nval) {
22 		list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
23 			if (nval == IPVLAN_MODE_L3)
24 				ipvlan->dev->flags |= IFF_NOARP;
25 			else
26 				ipvlan->dev->flags &= ~IFF_NOARP;
27 		}
28 		port->mode = nval;
29 	}
30 }
31 
32 static int ipvlan_port_create(struct net_device *dev)
33 {
34 	struct ipvl_port *port;
35 	int err, idx;
36 
37 	if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) {
38 		netdev_err(dev, "Master is either lo or non-ether device\n");
39 		return -EINVAL;
40 	}
41 
42 	if (netif_is_macvlan_port(dev)) {
43 		netdev_err(dev, "Master is a macvlan port.\n");
44 		return -EBUSY;
45 	}
46 
47 	port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
48 	if (!port)
49 		return -ENOMEM;
50 
51 	port->dev = dev;
52 	port->mode = IPVLAN_MODE_L3;
53 	INIT_LIST_HEAD(&port->ipvlans);
54 	for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
55 		INIT_HLIST_HEAD(&port->hlhead[idx]);
56 
57 	err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
58 	if (err)
59 		goto err;
60 
61 	dev->priv_flags |= IFF_IPVLAN_MASTER;
62 	return 0;
63 
64 err:
65 	kfree_rcu(port, rcu);
66 	return err;
67 }
68 
69 static void ipvlan_port_destroy(struct net_device *dev)
70 {
71 	struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
72 
73 	dev->priv_flags &= ~IFF_IPVLAN_MASTER;
74 	netdev_rx_handler_unregister(dev);
75 	kfree_rcu(port, rcu);
76 }
77 
78 /* ipvlan network devices have devices nesting below it and are a special
79  * "super class" of normal network devices; split their locks off into a
80  * separate class since they always nest.
81  */
82 static struct lock_class_key ipvlan_netdev_xmit_lock_key;
83 static struct lock_class_key ipvlan_netdev_addr_lock_key;
84 
85 #define IPVLAN_FEATURES \
86 	(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
87 	 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
88 	 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
89 	 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
90 
91 #define IPVLAN_STATE_MASK \
92 	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
93 
94 static void ipvlan_set_lockdep_class_one(struct net_device *dev,
95 					 struct netdev_queue *txq,
96 					 void *_unused)
97 {
98 	lockdep_set_class(&txq->_xmit_lock, &ipvlan_netdev_xmit_lock_key);
99 }
100 
101 static void ipvlan_set_lockdep_class(struct net_device *dev)
102 {
103 	lockdep_set_class(&dev->addr_list_lock, &ipvlan_netdev_addr_lock_key);
104 	netdev_for_each_tx_queue(dev, ipvlan_set_lockdep_class_one, NULL);
105 }
106 
107 static int ipvlan_init(struct net_device *dev)
108 {
109 	struct ipvl_dev *ipvlan = netdev_priv(dev);
110 	const struct net_device *phy_dev = ipvlan->phy_dev;
111 
112 	dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
113 		     (phy_dev->state & IPVLAN_STATE_MASK);
114 	dev->features = phy_dev->features & IPVLAN_FEATURES;
115 	dev->features |= NETIF_F_LLTX;
116 	dev->gso_max_size = phy_dev->gso_max_size;
117 	dev->iflink = phy_dev->ifindex;
118 	dev->hard_header_len = phy_dev->hard_header_len;
119 
120 	ipvlan_set_lockdep_class(dev);
121 
122 	ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats);
123 	if (!ipvlan->pcpu_stats)
124 		return -ENOMEM;
125 
126 	return 0;
127 }
128 
129 static void ipvlan_uninit(struct net_device *dev)
130 {
131 	struct ipvl_dev *ipvlan = netdev_priv(dev);
132 	struct ipvl_port *port = ipvlan->port;
133 
134 	free_percpu(ipvlan->pcpu_stats);
135 
136 	port->count -= 1;
137 	if (!port->count)
138 		ipvlan_port_destroy(port->dev);
139 }
140 
141 static int ipvlan_open(struct net_device *dev)
142 {
143 	struct ipvl_dev *ipvlan = netdev_priv(dev);
144 	struct net_device *phy_dev = ipvlan->phy_dev;
145 	struct ipvl_addr *addr;
146 
147 	if (ipvlan->port->mode == IPVLAN_MODE_L3)
148 		dev->flags |= IFF_NOARP;
149 	else
150 		dev->flags &= ~IFF_NOARP;
151 
152 	if (ipvlan->ipv6cnt > 0 || ipvlan->ipv4cnt > 0) {
153 		list_for_each_entry(addr, &ipvlan->addrs, anode)
154 			ipvlan_ht_addr_add(ipvlan, addr);
155 	}
156 	return dev_uc_add(phy_dev, phy_dev->dev_addr);
157 }
158 
159 static int ipvlan_stop(struct net_device *dev)
160 {
161 	struct ipvl_dev *ipvlan = netdev_priv(dev);
162 	struct net_device *phy_dev = ipvlan->phy_dev;
163 	struct ipvl_addr *addr;
164 
165 	dev_uc_unsync(phy_dev, dev);
166 	dev_mc_unsync(phy_dev, dev);
167 
168 	dev_uc_del(phy_dev, phy_dev->dev_addr);
169 
170 	if (ipvlan->ipv6cnt > 0 || ipvlan->ipv4cnt > 0) {
171 		list_for_each_entry(addr, &ipvlan->addrs, anode)
172 			ipvlan_ht_addr_del(addr, !dev->dismantle);
173 	}
174 	return 0;
175 }
176 
177 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
178 				     struct net_device *dev)
179 {
180 	const struct ipvl_dev *ipvlan = netdev_priv(dev);
181 	int skblen = skb->len;
182 	int ret;
183 
184 	ret = ipvlan_queue_xmit(skb, dev);
185 	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
186 		struct ipvl_pcpu_stats *pcptr;
187 
188 		pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
189 
190 		u64_stats_update_begin(&pcptr->syncp);
191 		pcptr->tx_pkts++;
192 		pcptr->tx_bytes += skblen;
193 		u64_stats_update_end(&pcptr->syncp);
194 	} else {
195 		this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
196 	}
197 	return ret;
198 }
199 
200 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
201 					     netdev_features_t features)
202 {
203 	struct ipvl_dev *ipvlan = netdev_priv(dev);
204 
205 	return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
206 }
207 
208 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
209 {
210 	struct ipvl_dev *ipvlan = netdev_priv(dev);
211 	struct net_device *phy_dev = ipvlan->phy_dev;
212 
213 	if (change & IFF_ALLMULTI)
214 		dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
215 }
216 
217 static void ipvlan_set_broadcast_mac_filter(struct ipvl_dev *ipvlan, bool set)
218 {
219 	struct net_device *dev = ipvlan->dev;
220 	unsigned int hashbit = ipvlan_mac_hash(dev->broadcast);
221 
222 	if (set && !test_bit(hashbit, ipvlan->mac_filters))
223 		__set_bit(hashbit, ipvlan->mac_filters);
224 	else if (!set && test_bit(hashbit, ipvlan->mac_filters))
225 		__clear_bit(hashbit, ipvlan->mac_filters);
226 }
227 
228 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
229 {
230 	struct ipvl_dev *ipvlan = netdev_priv(dev);
231 
232 	if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
233 		bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
234 	} else {
235 		struct netdev_hw_addr *ha;
236 		DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
237 
238 		bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
239 		netdev_for_each_mc_addr(ha, dev)
240 			__set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
241 
242 		bitmap_copy(ipvlan->mac_filters, mc_filters,
243 			    IPVLAN_MAC_FILTER_SIZE);
244 	}
245 	dev_uc_sync(ipvlan->phy_dev, dev);
246 	dev_mc_sync(ipvlan->phy_dev, dev);
247 }
248 
249 static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev,
250 						    struct rtnl_link_stats64 *s)
251 {
252 	struct ipvl_dev *ipvlan = netdev_priv(dev);
253 
254 	if (ipvlan->pcpu_stats) {
255 		struct ipvl_pcpu_stats *pcptr;
256 		u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
257 		u32 rx_errs = 0, tx_drps = 0;
258 		u32 strt;
259 		int idx;
260 
261 		for_each_possible_cpu(idx) {
262 			pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
263 			do {
264 				strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
265 				rx_pkts = pcptr->rx_pkts;
266 				rx_bytes = pcptr->rx_bytes;
267 				rx_mcast = pcptr->rx_mcast;
268 				tx_pkts = pcptr->tx_pkts;
269 				tx_bytes = pcptr->tx_bytes;
270 			} while (u64_stats_fetch_retry_irq(&pcptr->syncp,
271 							   strt));
272 
273 			s->rx_packets += rx_pkts;
274 			s->rx_bytes += rx_bytes;
275 			s->multicast += rx_mcast;
276 			s->tx_packets += tx_pkts;
277 			s->tx_bytes += tx_bytes;
278 
279 			/* u32 values are updated without syncp protection. */
280 			rx_errs += pcptr->rx_errs;
281 			tx_drps += pcptr->tx_drps;
282 		}
283 		s->rx_errors = rx_errs;
284 		s->rx_dropped = rx_errs;
285 		s->tx_dropped = tx_drps;
286 	}
287 	return s;
288 }
289 
290 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
291 {
292 	struct ipvl_dev *ipvlan = netdev_priv(dev);
293 	struct net_device *phy_dev = ipvlan->phy_dev;
294 
295 	return vlan_vid_add(phy_dev, proto, vid);
296 }
297 
298 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
299 				   u16 vid)
300 {
301 	struct ipvl_dev *ipvlan = netdev_priv(dev);
302 	struct net_device *phy_dev = ipvlan->phy_dev;
303 
304 	vlan_vid_del(phy_dev, proto, vid);
305 	return 0;
306 }
307 
308 static const struct net_device_ops ipvlan_netdev_ops = {
309 	.ndo_init		= ipvlan_init,
310 	.ndo_uninit		= ipvlan_uninit,
311 	.ndo_open		= ipvlan_open,
312 	.ndo_stop		= ipvlan_stop,
313 	.ndo_start_xmit		= ipvlan_start_xmit,
314 	.ndo_fix_features	= ipvlan_fix_features,
315 	.ndo_change_rx_flags	= ipvlan_change_rx_flags,
316 	.ndo_set_rx_mode	= ipvlan_set_multicast_mac_filter,
317 	.ndo_get_stats64	= ipvlan_get_stats64,
318 	.ndo_vlan_rx_add_vid	= ipvlan_vlan_rx_add_vid,
319 	.ndo_vlan_rx_kill_vid	= ipvlan_vlan_rx_kill_vid,
320 };
321 
322 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
323 			      unsigned short type, const void *daddr,
324 			      const void *saddr, unsigned len)
325 {
326 	const struct ipvl_dev *ipvlan = netdev_priv(dev);
327 	struct net_device *phy_dev = ipvlan->phy_dev;
328 
329 	/* TODO Probably use a different field than dev_addr so that the
330 	 * mac-address on the virtual device is portable and can be carried
331 	 * while the packets use the mac-addr on the physical device.
332 	 */
333 	return dev_hard_header(skb, phy_dev, type, daddr,
334 			       saddr ? : dev->dev_addr, len);
335 }
336 
337 static const struct header_ops ipvlan_header_ops = {
338 	.create  	= ipvlan_hard_header,
339 	.rebuild	= eth_rebuild_header,
340 	.parse		= eth_header_parse,
341 	.cache		= eth_header_cache,
342 	.cache_update	= eth_header_cache_update,
343 };
344 
345 static int ipvlan_ethtool_get_settings(struct net_device *dev,
346 				       struct ethtool_cmd *cmd)
347 {
348 	const struct ipvl_dev *ipvlan = netdev_priv(dev);
349 
350 	return __ethtool_get_settings(ipvlan->phy_dev, cmd);
351 }
352 
353 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
354 				       struct ethtool_drvinfo *drvinfo)
355 {
356 	strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
357 	strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
358 }
359 
360 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
361 {
362 	const struct ipvl_dev *ipvlan = netdev_priv(dev);
363 
364 	return ipvlan->msg_enable;
365 }
366 
367 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
368 {
369 	struct ipvl_dev *ipvlan = netdev_priv(dev);
370 
371 	ipvlan->msg_enable = value;
372 }
373 
374 static const struct ethtool_ops ipvlan_ethtool_ops = {
375 	.get_link	= ethtool_op_get_link,
376 	.get_settings	= ipvlan_ethtool_get_settings,
377 	.get_drvinfo	= ipvlan_ethtool_get_drvinfo,
378 	.get_msglevel	= ipvlan_ethtool_get_msglevel,
379 	.set_msglevel	= ipvlan_ethtool_set_msglevel,
380 };
381 
382 static int ipvlan_nl_changelink(struct net_device *dev,
383 				struct nlattr *tb[], struct nlattr *data[])
384 {
385 	struct ipvl_dev *ipvlan = netdev_priv(dev);
386 	struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
387 
388 	if (data && data[IFLA_IPVLAN_MODE]) {
389 		u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
390 
391 		ipvlan_set_port_mode(port, nmode);
392 	}
393 	return 0;
394 }
395 
396 static size_t ipvlan_nl_getsize(const struct net_device *dev)
397 {
398 	return (0
399 		+ nla_total_size(2) /* IFLA_IPVLAN_MODE */
400 		);
401 }
402 
403 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[])
404 {
405 	if (data && data[IFLA_IPVLAN_MODE]) {
406 		u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
407 
408 		if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
409 			return -EINVAL;
410 	}
411 	return 0;
412 }
413 
414 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
415 			      const struct net_device *dev)
416 {
417 	struct ipvl_dev *ipvlan = netdev_priv(dev);
418 	struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
419 	int ret = -EINVAL;
420 
421 	if (!port)
422 		goto err;
423 
424 	ret = -EMSGSIZE;
425 	if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
426 		goto err;
427 
428 	return 0;
429 
430 err:
431 	return ret;
432 }
433 
434 static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
435 			   struct nlattr *tb[], struct nlattr *data[])
436 {
437 	struct ipvl_dev *ipvlan = netdev_priv(dev);
438 	struct ipvl_port *port;
439 	struct net_device *phy_dev;
440 	int err;
441 
442 	if (!tb[IFLA_LINK])
443 		return -EINVAL;
444 
445 	phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
446 	if (!phy_dev)
447 		return -ENODEV;
448 
449 	if (netif_is_ipvlan(phy_dev)) {
450 		struct ipvl_dev *tmp = netdev_priv(phy_dev);
451 
452 		phy_dev = tmp->phy_dev;
453 	} else if (!netif_is_ipvlan_port(phy_dev)) {
454 		err = ipvlan_port_create(phy_dev);
455 		if (err < 0)
456 			return err;
457 	}
458 
459 	port = ipvlan_port_get_rtnl(phy_dev);
460 	if (data && data[IFLA_IPVLAN_MODE])
461 		port->mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
462 
463 	ipvlan->phy_dev = phy_dev;
464 	ipvlan->dev = dev;
465 	ipvlan->port = port;
466 	ipvlan->sfeatures = IPVLAN_FEATURES;
467 	INIT_LIST_HEAD(&ipvlan->addrs);
468 	ipvlan->ipv4cnt = 0;
469 	ipvlan->ipv6cnt = 0;
470 
471 	/* TODO Probably put random address here to be presented to the
472 	 * world but keep using the physical-dev address for the outgoing
473 	 * packets.
474 	 */
475 	memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
476 
477 	dev->priv_flags |= IFF_IPVLAN_SLAVE;
478 
479 	port->count += 1;
480 	err = register_netdevice(dev);
481 	if (err < 0)
482 		goto ipvlan_destroy_port;
483 
484 	err = netdev_upper_dev_link(phy_dev, dev);
485 	if (err)
486 		goto ipvlan_destroy_port;
487 
488 	list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
489 	netif_stacked_transfer_operstate(phy_dev, dev);
490 	return 0;
491 
492 ipvlan_destroy_port:
493 	port->count -= 1;
494 	if (!port->count)
495 		ipvlan_port_destroy(phy_dev);
496 
497 	return err;
498 }
499 
500 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
501 {
502 	struct ipvl_dev *ipvlan = netdev_priv(dev);
503 	struct ipvl_addr *addr, *next;
504 
505 	if (ipvlan->ipv6cnt > 0 || ipvlan->ipv4cnt > 0) {
506 		list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
507 			ipvlan_ht_addr_del(addr, !dev->dismantle);
508 			list_del_rcu(&addr->anode);
509 		}
510 	}
511 	list_del_rcu(&ipvlan->pnode);
512 	unregister_netdevice_queue(dev, head);
513 	netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
514 }
515 
516 static void ipvlan_link_setup(struct net_device *dev)
517 {
518 	ether_setup(dev);
519 
520 	dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
521 	dev->priv_flags |= IFF_UNICAST_FLT;
522 	dev->netdev_ops = &ipvlan_netdev_ops;
523 	dev->destructor = free_netdev;
524 	dev->header_ops = &ipvlan_header_ops;
525 	dev->ethtool_ops = &ipvlan_ethtool_ops;
526 	dev->tx_queue_len = 0;
527 }
528 
529 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
530 {
531 	[IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
532 };
533 
534 static struct rtnl_link_ops ipvlan_link_ops = {
535 	.kind		= "ipvlan",
536 	.priv_size	= sizeof(struct ipvl_dev),
537 
538 	.get_size	= ipvlan_nl_getsize,
539 	.policy		= ipvlan_nl_policy,
540 	.validate	= ipvlan_nl_validate,
541 	.fill_info	= ipvlan_nl_fillinfo,
542 	.changelink	= ipvlan_nl_changelink,
543 	.maxtype	= IFLA_IPVLAN_MAX,
544 
545 	.setup		= ipvlan_link_setup,
546 	.newlink	= ipvlan_link_new,
547 	.dellink	= ipvlan_link_delete,
548 };
549 
550 static int ipvlan_link_register(struct rtnl_link_ops *ops)
551 {
552 	return rtnl_link_register(ops);
553 }
554 
555 static int ipvlan_device_event(struct notifier_block *unused,
556 			       unsigned long event, void *ptr)
557 {
558 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
559 	struct ipvl_dev *ipvlan, *next;
560 	struct ipvl_port *port;
561 	LIST_HEAD(lst_kill);
562 
563 	if (!netif_is_ipvlan_port(dev))
564 		return NOTIFY_DONE;
565 
566 	port = ipvlan_port_get_rtnl(dev);
567 
568 	switch (event) {
569 	case NETDEV_CHANGE:
570 		list_for_each_entry(ipvlan, &port->ipvlans, pnode)
571 			netif_stacked_transfer_operstate(ipvlan->phy_dev,
572 							 ipvlan->dev);
573 		break;
574 
575 	case NETDEV_UNREGISTER:
576 		if (dev->reg_state != NETREG_UNREGISTERING)
577 			break;
578 
579 		list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
580 					 pnode)
581 			ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
582 							    &lst_kill);
583 		unregister_netdevice_many(&lst_kill);
584 		break;
585 
586 	case NETDEV_FEAT_CHANGE:
587 		list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
588 			ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
589 			ipvlan->dev->gso_max_size = dev->gso_max_size;
590 			netdev_features_change(ipvlan->dev);
591 		}
592 		break;
593 
594 	case NETDEV_CHANGEMTU:
595 		list_for_each_entry(ipvlan, &port->ipvlans, pnode)
596 			ipvlan_adjust_mtu(ipvlan, dev);
597 		break;
598 
599 	case NETDEV_PRE_TYPE_CHANGE:
600 		/* Forbid underlying device to change its type. */
601 		return NOTIFY_BAD;
602 	}
603 	return NOTIFY_DONE;
604 }
605 
606 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
607 {
608 	struct ipvl_addr *addr;
609 
610 	if (ipvlan_addr_busy(ipvlan, ip6_addr, true)) {
611 		netif_err(ipvlan, ifup, ipvlan->dev,
612 			  "Failed to add IPv6=%pI6c addr for %s intf\n",
613 			  ip6_addr, ipvlan->dev->name);
614 		return -EINVAL;
615 	}
616 	addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
617 	if (!addr)
618 		return -ENOMEM;
619 
620 	addr->master = ipvlan;
621 	memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr));
622 	addr->atype = IPVL_IPV6;
623 	list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
624 	ipvlan->ipv6cnt++;
625 	ipvlan_ht_addr_add(ipvlan, addr);
626 
627 	return 0;
628 }
629 
630 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
631 {
632 	struct ipvl_addr *addr;
633 
634 	addr = ipvlan_ht_addr_lookup(ipvlan->port, ip6_addr, true);
635 	if (!addr)
636 		return;
637 
638 	ipvlan_ht_addr_del(addr, true);
639 	list_del_rcu(&addr->anode);
640 	ipvlan->ipv6cnt--;
641 	WARN_ON(ipvlan->ipv6cnt < 0);
642 	kfree_rcu(addr, rcu);
643 
644 	return;
645 }
646 
647 static int ipvlan_addr6_event(struct notifier_block *unused,
648 			      unsigned long event, void *ptr)
649 {
650 	struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
651 	struct net_device *dev = (struct net_device *)if6->idev->dev;
652 	struct ipvl_dev *ipvlan = netdev_priv(dev);
653 
654 	if (!netif_is_ipvlan(dev))
655 		return NOTIFY_DONE;
656 
657 	if (!ipvlan || !ipvlan->port)
658 		return NOTIFY_DONE;
659 
660 	switch (event) {
661 	case NETDEV_UP:
662 		if (ipvlan_add_addr6(ipvlan, &if6->addr))
663 			return NOTIFY_BAD;
664 		break;
665 
666 	case NETDEV_DOWN:
667 		ipvlan_del_addr6(ipvlan, &if6->addr);
668 		break;
669 	}
670 
671 	return NOTIFY_OK;
672 }
673 
674 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
675 {
676 	struct ipvl_addr *addr;
677 
678 	if (ipvlan_addr_busy(ipvlan, ip4_addr, false)) {
679 		netif_err(ipvlan, ifup, ipvlan->dev,
680 			  "Failed to add IPv4=%pI4 on %s intf.\n",
681 			  ip4_addr, ipvlan->dev->name);
682 		return -EINVAL;
683 	}
684 	addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL);
685 	if (!addr)
686 		return -ENOMEM;
687 
688 	addr->master = ipvlan;
689 	memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr));
690 	addr->atype = IPVL_IPV4;
691 	list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
692 	ipvlan->ipv4cnt++;
693 	ipvlan_ht_addr_add(ipvlan, addr);
694 	ipvlan_set_broadcast_mac_filter(ipvlan, true);
695 
696 	return 0;
697 }
698 
699 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
700 {
701 	struct ipvl_addr *addr;
702 
703 	addr = ipvlan_ht_addr_lookup(ipvlan->port, ip4_addr, false);
704 	if (!addr)
705 		return;
706 
707 	ipvlan_ht_addr_del(addr, true);
708 	list_del_rcu(&addr->anode);
709 	ipvlan->ipv4cnt--;
710 	WARN_ON(ipvlan->ipv4cnt < 0);
711 	if (!ipvlan->ipv4cnt)
712 	    ipvlan_set_broadcast_mac_filter(ipvlan, false);
713 	kfree_rcu(addr, rcu);
714 
715 	return;
716 }
717 
718 static int ipvlan_addr4_event(struct notifier_block *unused,
719 			      unsigned long event, void *ptr)
720 {
721 	struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
722 	struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
723 	struct ipvl_dev *ipvlan = netdev_priv(dev);
724 	struct in_addr ip4_addr;
725 
726 	if (!netif_is_ipvlan(dev))
727 		return NOTIFY_DONE;
728 
729 	if (!ipvlan || !ipvlan->port)
730 		return NOTIFY_DONE;
731 
732 	switch (event) {
733 	case NETDEV_UP:
734 		ip4_addr.s_addr = if4->ifa_address;
735 		if (ipvlan_add_addr4(ipvlan, &ip4_addr))
736 			return NOTIFY_BAD;
737 		break;
738 
739 	case NETDEV_DOWN:
740 		ip4_addr.s_addr = if4->ifa_address;
741 		ipvlan_del_addr4(ipvlan, &ip4_addr);
742 		break;
743 	}
744 
745 	return NOTIFY_OK;
746 }
747 
748 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
749 	.notifier_call = ipvlan_addr4_event,
750 };
751 
752 static struct notifier_block ipvlan_notifier_block __read_mostly = {
753 	.notifier_call = ipvlan_device_event,
754 };
755 
756 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
757 	.notifier_call = ipvlan_addr6_event,
758 };
759 
760 static int __init ipvlan_init_module(void)
761 {
762 	int err;
763 
764 	ipvlan_init_secret();
765 	register_netdevice_notifier(&ipvlan_notifier_block);
766 	register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
767 	register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
768 
769 	err = ipvlan_link_register(&ipvlan_link_ops);
770 	if (err < 0)
771 		goto error;
772 
773 	return 0;
774 error:
775 	unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
776 	unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
777 	unregister_netdevice_notifier(&ipvlan_notifier_block);
778 	return err;
779 }
780 
781 static void __exit ipvlan_cleanup_module(void)
782 {
783 	rtnl_link_unregister(&ipvlan_link_ops);
784 	unregister_netdevice_notifier(&ipvlan_notifier_block);
785 	unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
786 	unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
787 }
788 
789 module_init(ipvlan_init_module);
790 module_exit(ipvlan_cleanup_module);
791 
792 MODULE_LICENSE("GPL");
793 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
794 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
795 MODULE_ALIAS_RTNL_LINK("ipvlan");
796