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Merge tag 'armsoc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[mirror_ubuntu-eoan-kernel.git] / drivers / net / ipvlan / ipvlan_main.c
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 skb_queue_head_init(&port->backlog);
58 INIT_WORK(&port->wq, ipvlan_process_multicast);
59
60 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
61 if (err)
62 goto err;
63
64 dev->priv_flags |= IFF_IPVLAN_MASTER;
65 return 0;
66
67 err:
68 kfree_rcu(port, rcu);
69 return err;
70 }
71
72 static void ipvlan_port_destroy(struct net_device *dev)
73 {
74 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
75
76 dev->priv_flags &= ~IFF_IPVLAN_MASTER;
77 netdev_rx_handler_unregister(dev);
78 cancel_work_sync(&port->wq);
79 __skb_queue_purge(&port->backlog);
80 kfree_rcu(port, rcu);
81 }
82
83 /* ipvlan network devices have devices nesting below it and are a special
84 * "super class" of normal network devices; split their locks off into a
85 * separate class since they always nest.
86 */
87 static struct lock_class_key ipvlan_netdev_xmit_lock_key;
88 static struct lock_class_key ipvlan_netdev_addr_lock_key;
89
90 #define IPVLAN_FEATURES \
91 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
92 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
93 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
94 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
95
96 #define IPVLAN_STATE_MASK \
97 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
98
99 static void ipvlan_set_lockdep_class_one(struct net_device *dev,
100 struct netdev_queue *txq,
101 void *_unused)
102 {
103 lockdep_set_class(&txq->_xmit_lock, &ipvlan_netdev_xmit_lock_key);
104 }
105
106 static void ipvlan_set_lockdep_class(struct net_device *dev)
107 {
108 lockdep_set_class(&dev->addr_list_lock, &ipvlan_netdev_addr_lock_key);
109 netdev_for_each_tx_queue(dev, ipvlan_set_lockdep_class_one, NULL);
110 }
111
112 static int ipvlan_init(struct net_device *dev)
113 {
114 struct ipvl_dev *ipvlan = netdev_priv(dev);
115 const struct net_device *phy_dev = ipvlan->phy_dev;
116
117 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
118 (phy_dev->state & IPVLAN_STATE_MASK);
119 dev->features = phy_dev->features & IPVLAN_FEATURES;
120 dev->features |= NETIF_F_LLTX;
121 dev->gso_max_size = phy_dev->gso_max_size;
122 dev->hard_header_len = phy_dev->hard_header_len;
123
124 ipvlan_set_lockdep_class(dev);
125
126 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats);
127 if (!ipvlan->pcpu_stats)
128 return -ENOMEM;
129
130 return 0;
131 }
132
133 static void ipvlan_uninit(struct net_device *dev)
134 {
135 struct ipvl_dev *ipvlan = netdev_priv(dev);
136 struct ipvl_port *port = ipvlan->port;
137
138 free_percpu(ipvlan->pcpu_stats);
139
140 port->count -= 1;
141 if (!port->count)
142 ipvlan_port_destroy(port->dev);
143 }
144
145 static int ipvlan_open(struct net_device *dev)
146 {
147 struct ipvl_dev *ipvlan = netdev_priv(dev);
148 struct net_device *phy_dev = ipvlan->phy_dev;
149 struct ipvl_addr *addr;
150
151 if (ipvlan->port->mode == IPVLAN_MODE_L3)
152 dev->flags |= IFF_NOARP;
153 else
154 dev->flags &= ~IFF_NOARP;
155
156 list_for_each_entry(addr, &ipvlan->addrs, anode)
157 ipvlan_ht_addr_add(ipvlan, addr);
158
159 return dev_uc_add(phy_dev, phy_dev->dev_addr);
160 }
161
162 static int ipvlan_stop(struct net_device *dev)
163 {
164 struct ipvl_dev *ipvlan = netdev_priv(dev);
165 struct net_device *phy_dev = ipvlan->phy_dev;
166 struct ipvl_addr *addr;
167
168 dev_uc_unsync(phy_dev, dev);
169 dev_mc_unsync(phy_dev, dev);
170
171 dev_uc_del(phy_dev, phy_dev->dev_addr);
172
173 list_for_each_entry(addr, &ipvlan->addrs, anode)
174 ipvlan_ht_addr_del(addr);
175
176 return 0;
177 }
178
179 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
180 struct net_device *dev)
181 {
182 const struct ipvl_dev *ipvlan = netdev_priv(dev);
183 int skblen = skb->len;
184 int ret;
185
186 ret = ipvlan_queue_xmit(skb, dev);
187 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
188 struct ipvl_pcpu_stats *pcptr;
189
190 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
191
192 u64_stats_update_begin(&pcptr->syncp);
193 pcptr->tx_pkts++;
194 pcptr->tx_bytes += skblen;
195 u64_stats_update_end(&pcptr->syncp);
196 } else {
197 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
198 }
199 return ret;
200 }
201
202 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
203 netdev_features_t features)
204 {
205 struct ipvl_dev *ipvlan = netdev_priv(dev);
206
207 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
208 }
209
210 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
211 {
212 struct ipvl_dev *ipvlan = netdev_priv(dev);
213 struct net_device *phy_dev = ipvlan->phy_dev;
214
215 if (change & IFF_ALLMULTI)
216 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
217 }
218
219 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
220 {
221 struct ipvl_dev *ipvlan = netdev_priv(dev);
222
223 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
224 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
225 } else {
226 struct netdev_hw_addr *ha;
227 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
228
229 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
230 netdev_for_each_mc_addr(ha, dev)
231 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
232
233 /* Turn-on broadcast bit irrespective of address family,
234 * since broadcast is deferred to a work-queue, hence no
235 * impact on fast-path processing.
236 */
237 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
238
239 bitmap_copy(ipvlan->mac_filters, mc_filters,
240 IPVLAN_MAC_FILTER_SIZE);
241 }
242 dev_uc_sync(ipvlan->phy_dev, dev);
243 dev_mc_sync(ipvlan->phy_dev, dev);
244 }
245
246 static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev,
247 struct rtnl_link_stats64 *s)
248 {
249 struct ipvl_dev *ipvlan = netdev_priv(dev);
250
251 if (ipvlan->pcpu_stats) {
252 struct ipvl_pcpu_stats *pcptr;
253 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
254 u32 rx_errs = 0, tx_drps = 0;
255 u32 strt;
256 int idx;
257
258 for_each_possible_cpu(idx) {
259 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
260 do {
261 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
262 rx_pkts = pcptr->rx_pkts;
263 rx_bytes = pcptr->rx_bytes;
264 rx_mcast = pcptr->rx_mcast;
265 tx_pkts = pcptr->tx_pkts;
266 tx_bytes = pcptr->tx_bytes;
267 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
268 strt));
269
270 s->rx_packets += rx_pkts;
271 s->rx_bytes += rx_bytes;
272 s->multicast += rx_mcast;
273 s->tx_packets += tx_pkts;
274 s->tx_bytes += tx_bytes;
275
276 /* u32 values are updated without syncp protection. */
277 rx_errs += pcptr->rx_errs;
278 tx_drps += pcptr->tx_drps;
279 }
280 s->rx_errors = rx_errs;
281 s->rx_dropped = rx_errs;
282 s->tx_dropped = tx_drps;
283 }
284 return s;
285 }
286
287 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
288 {
289 struct ipvl_dev *ipvlan = netdev_priv(dev);
290 struct net_device *phy_dev = ipvlan->phy_dev;
291
292 return vlan_vid_add(phy_dev, proto, vid);
293 }
294
295 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
296 u16 vid)
297 {
298 struct ipvl_dev *ipvlan = netdev_priv(dev);
299 struct net_device *phy_dev = ipvlan->phy_dev;
300
301 vlan_vid_del(phy_dev, proto, vid);
302 return 0;
303 }
304
305 static int ipvlan_get_iflink(const struct net_device *dev)
306 {
307 struct ipvl_dev *ipvlan = netdev_priv(dev);
308
309 return ipvlan->phy_dev->ifindex;
310 }
311
312 static const struct net_device_ops ipvlan_netdev_ops = {
313 .ndo_init = ipvlan_init,
314 .ndo_uninit = ipvlan_uninit,
315 .ndo_open = ipvlan_open,
316 .ndo_stop = ipvlan_stop,
317 .ndo_start_xmit = ipvlan_start_xmit,
318 .ndo_fix_features = ipvlan_fix_features,
319 .ndo_change_rx_flags = ipvlan_change_rx_flags,
320 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
321 .ndo_get_stats64 = ipvlan_get_stats64,
322 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
323 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
324 .ndo_get_iflink = ipvlan_get_iflink,
325 };
326
327 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
328 unsigned short type, const void *daddr,
329 const void *saddr, unsigned len)
330 {
331 const struct ipvl_dev *ipvlan = netdev_priv(dev);
332 struct net_device *phy_dev = ipvlan->phy_dev;
333
334 /* TODO Probably use a different field than dev_addr so that the
335 * mac-address on the virtual device is portable and can be carried
336 * while the packets use the mac-addr on the physical device.
337 */
338 return dev_hard_header(skb, phy_dev, type, daddr,
339 saddr ? : dev->dev_addr, len);
340 }
341
342 static const struct header_ops ipvlan_header_ops = {
343 .create = ipvlan_hard_header,
344 .parse = eth_header_parse,
345 .cache = eth_header_cache,
346 .cache_update = eth_header_cache_update,
347 };
348
349 static int ipvlan_ethtool_get_settings(struct net_device *dev,
350 struct ethtool_cmd *cmd)
351 {
352 const struct ipvl_dev *ipvlan = netdev_priv(dev);
353
354 return __ethtool_get_settings(ipvlan->phy_dev, cmd);
355 }
356
357 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
358 struct ethtool_drvinfo *drvinfo)
359 {
360 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
361 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
362 }
363
364 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
365 {
366 const struct ipvl_dev *ipvlan = netdev_priv(dev);
367
368 return ipvlan->msg_enable;
369 }
370
371 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
372 {
373 struct ipvl_dev *ipvlan = netdev_priv(dev);
374
375 ipvlan->msg_enable = value;
376 }
377
378 static const struct ethtool_ops ipvlan_ethtool_ops = {
379 .get_link = ethtool_op_get_link,
380 .get_settings = ipvlan_ethtool_get_settings,
381 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
382 .get_msglevel = ipvlan_ethtool_get_msglevel,
383 .set_msglevel = ipvlan_ethtool_set_msglevel,
384 };
385
386 static int ipvlan_nl_changelink(struct net_device *dev,
387 struct nlattr *tb[], struct nlattr *data[])
388 {
389 struct ipvl_dev *ipvlan = netdev_priv(dev);
390 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
391
392 if (data && data[IFLA_IPVLAN_MODE]) {
393 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
394
395 ipvlan_set_port_mode(port, nmode);
396 }
397 return 0;
398 }
399
400 static size_t ipvlan_nl_getsize(const struct net_device *dev)
401 {
402 return (0
403 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
404 );
405 }
406
407 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[])
408 {
409 if (data && data[IFLA_IPVLAN_MODE]) {
410 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
411
412 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
413 return -EINVAL;
414 }
415 return 0;
416 }
417
418 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
419 const struct net_device *dev)
420 {
421 struct ipvl_dev *ipvlan = netdev_priv(dev);
422 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
423 int ret = -EINVAL;
424
425 if (!port)
426 goto err;
427
428 ret = -EMSGSIZE;
429 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
430 goto err;
431
432 return 0;
433
434 err:
435 return ret;
436 }
437
438 static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
439 struct nlattr *tb[], struct nlattr *data[])
440 {
441 struct ipvl_dev *ipvlan = netdev_priv(dev);
442 struct ipvl_port *port;
443 struct net_device *phy_dev;
444 int err;
445
446 if (!tb[IFLA_LINK])
447 return -EINVAL;
448
449 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
450 if (!phy_dev)
451 return -ENODEV;
452
453 if (netif_is_ipvlan(phy_dev)) {
454 struct ipvl_dev *tmp = netdev_priv(phy_dev);
455
456 phy_dev = tmp->phy_dev;
457 } else if (!netif_is_ipvlan_port(phy_dev)) {
458 err = ipvlan_port_create(phy_dev);
459 if (err < 0)
460 return err;
461 }
462
463 port = ipvlan_port_get_rtnl(phy_dev);
464 if (data && data[IFLA_IPVLAN_MODE])
465 port->mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
466
467 ipvlan->phy_dev = phy_dev;
468 ipvlan->dev = dev;
469 ipvlan->port = port;
470 ipvlan->sfeatures = IPVLAN_FEATURES;
471 INIT_LIST_HEAD(&ipvlan->addrs);
472
473 /* TODO Probably put random address here to be presented to the
474 * world but keep using the physical-dev address for the outgoing
475 * packets.
476 */
477 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
478
479 dev->priv_flags |= IFF_IPVLAN_SLAVE;
480
481 port->count += 1;
482 err = register_netdevice(dev);
483 if (err < 0)
484 goto ipvlan_destroy_port;
485
486 err = netdev_upper_dev_link(phy_dev, dev);
487 if (err)
488 goto ipvlan_destroy_port;
489
490 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
491 netif_stacked_transfer_operstate(phy_dev, dev);
492 return 0;
493
494 ipvlan_destroy_port:
495 port->count -= 1;
496 if (!port->count)
497 ipvlan_port_destroy(phy_dev);
498
499 return err;
500 }
501
502 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
503 {
504 struct ipvl_dev *ipvlan = netdev_priv(dev);
505 struct ipvl_addr *addr, *next;
506
507 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
508 ipvlan_ht_addr_del(addr);
509 list_del(&addr->anode);
510 kfree_rcu(addr, rcu);
511 }
512
513 list_del_rcu(&ipvlan->pnode);
514 unregister_netdevice_queue(dev, head);
515 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
516 }
517
518 static void ipvlan_link_setup(struct net_device *dev)
519 {
520 ether_setup(dev);
521
522 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
523 dev->priv_flags |= IFF_UNICAST_FLT;
524 dev->netdev_ops = &ipvlan_netdev_ops;
525 dev->destructor = free_netdev;
526 dev->header_ops = &ipvlan_header_ops;
527 dev->ethtool_ops = &ipvlan_ethtool_ops;
528 dev->tx_queue_len = 0;
529 }
530
531 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
532 {
533 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
534 };
535
536 static struct rtnl_link_ops ipvlan_link_ops = {
537 .kind = "ipvlan",
538 .priv_size = sizeof(struct ipvl_dev),
539
540 .get_size = ipvlan_nl_getsize,
541 .policy = ipvlan_nl_policy,
542 .validate = ipvlan_nl_validate,
543 .fill_info = ipvlan_nl_fillinfo,
544 .changelink = ipvlan_nl_changelink,
545 .maxtype = IFLA_IPVLAN_MAX,
546
547 .setup = ipvlan_link_setup,
548 .newlink = ipvlan_link_new,
549 .dellink = ipvlan_link_delete,
550 };
551
552 static int ipvlan_link_register(struct rtnl_link_ops *ops)
553 {
554 return rtnl_link_register(ops);
555 }
556
557 static int ipvlan_device_event(struct notifier_block *unused,
558 unsigned long event, void *ptr)
559 {
560 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
561 struct ipvl_dev *ipvlan, *next;
562 struct ipvl_port *port;
563 LIST_HEAD(lst_kill);
564
565 if (!netif_is_ipvlan_port(dev))
566 return NOTIFY_DONE;
567
568 port = ipvlan_port_get_rtnl(dev);
569
570 switch (event) {
571 case NETDEV_CHANGE:
572 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
573 netif_stacked_transfer_operstate(ipvlan->phy_dev,
574 ipvlan->dev);
575 break;
576
577 case NETDEV_UNREGISTER:
578 if (dev->reg_state != NETREG_UNREGISTERING)
579 break;
580
581 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
582 pnode)
583 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
584 &lst_kill);
585 unregister_netdevice_many(&lst_kill);
586 break;
587
588 case NETDEV_FEAT_CHANGE:
589 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
590 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
591 ipvlan->dev->gso_max_size = dev->gso_max_size;
592 netdev_features_change(ipvlan->dev);
593 }
594 break;
595
596 case NETDEV_CHANGEMTU:
597 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
598 ipvlan_adjust_mtu(ipvlan, dev);
599 break;
600
601 case NETDEV_PRE_TYPE_CHANGE:
602 /* Forbid underlying device to change its type. */
603 return NOTIFY_BAD;
604 }
605 return NOTIFY_DONE;
606 }
607
608 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
609 {
610 struct ipvl_addr *addr;
611
612 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
613 netif_err(ipvlan, ifup, ipvlan->dev,
614 "Failed to add IPv6=%pI6c addr for %s intf\n",
615 ip6_addr, ipvlan->dev->name);
616 return -EINVAL;
617 }
618 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
619 if (!addr)
620 return -ENOMEM;
621
622 addr->master = ipvlan;
623 memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr));
624 addr->atype = IPVL_IPV6;
625 list_add_tail(&addr->anode, &ipvlan->addrs);
626
627 /* If the interface is not up, the address will be added to the hash
628 * list by ipvlan_open.
629 */
630 if (netif_running(ipvlan->dev))
631 ipvlan_ht_addr_add(ipvlan, addr);
632
633 return 0;
634 }
635
636 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
637 {
638 struct ipvl_addr *addr;
639
640 addr = ipvlan_find_addr(ipvlan, ip6_addr, true);
641 if (!addr)
642 return;
643
644 ipvlan_ht_addr_del(addr);
645 list_del(&addr->anode);
646 kfree_rcu(addr, rcu);
647
648 return;
649 }
650
651 static int ipvlan_addr6_event(struct notifier_block *unused,
652 unsigned long event, void *ptr)
653 {
654 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
655 struct net_device *dev = (struct net_device *)if6->idev->dev;
656 struct ipvl_dev *ipvlan = netdev_priv(dev);
657
658 /* FIXME IPv6 autoconf calls us from bh without RTNL */
659 if (in_softirq())
660 return NOTIFY_DONE;
661
662 if (!netif_is_ipvlan(dev))
663 return NOTIFY_DONE;
664
665 if (!ipvlan || !ipvlan->port)
666 return NOTIFY_DONE;
667
668 switch (event) {
669 case NETDEV_UP:
670 if (ipvlan_add_addr6(ipvlan, &if6->addr))
671 return NOTIFY_BAD;
672 break;
673
674 case NETDEV_DOWN:
675 ipvlan_del_addr6(ipvlan, &if6->addr);
676 break;
677 }
678
679 return NOTIFY_OK;
680 }
681
682 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
683 {
684 struct ipvl_addr *addr;
685
686 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
687 netif_err(ipvlan, ifup, ipvlan->dev,
688 "Failed to add IPv4=%pI4 on %s intf.\n",
689 ip4_addr, ipvlan->dev->name);
690 return -EINVAL;
691 }
692 addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL);
693 if (!addr)
694 return -ENOMEM;
695
696 addr->master = ipvlan;
697 memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr));
698 addr->atype = IPVL_IPV4;
699 list_add_tail(&addr->anode, &ipvlan->addrs);
700
701 /* If the interface is not up, the address will be added to the hash
702 * list by ipvlan_open.
703 */
704 if (netif_running(ipvlan->dev))
705 ipvlan_ht_addr_add(ipvlan, addr);
706
707 return 0;
708 }
709
710 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
711 {
712 struct ipvl_addr *addr;
713
714 addr = ipvlan_find_addr(ipvlan, ip4_addr, false);
715 if (!addr)
716 return;
717
718 ipvlan_ht_addr_del(addr);
719 list_del(&addr->anode);
720 kfree_rcu(addr, rcu);
721
722 return;
723 }
724
725 static int ipvlan_addr4_event(struct notifier_block *unused,
726 unsigned long event, void *ptr)
727 {
728 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
729 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
730 struct ipvl_dev *ipvlan = netdev_priv(dev);
731 struct in_addr ip4_addr;
732
733 if (!netif_is_ipvlan(dev))
734 return NOTIFY_DONE;
735
736 if (!ipvlan || !ipvlan->port)
737 return NOTIFY_DONE;
738
739 switch (event) {
740 case NETDEV_UP:
741 ip4_addr.s_addr = if4->ifa_address;
742 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
743 return NOTIFY_BAD;
744 break;
745
746 case NETDEV_DOWN:
747 ip4_addr.s_addr = if4->ifa_address;
748 ipvlan_del_addr4(ipvlan, &ip4_addr);
749 break;
750 }
751
752 return NOTIFY_OK;
753 }
754
755 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
756 .notifier_call = ipvlan_addr4_event,
757 };
758
759 static struct notifier_block ipvlan_notifier_block __read_mostly = {
760 .notifier_call = ipvlan_device_event,
761 };
762
763 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
764 .notifier_call = ipvlan_addr6_event,
765 };
766
767 static int __init ipvlan_init_module(void)
768 {
769 int err;
770
771 ipvlan_init_secret();
772 register_netdevice_notifier(&ipvlan_notifier_block);
773 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
774 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
775
776 err = ipvlan_link_register(&ipvlan_link_ops);
777 if (err < 0)
778 goto error;
779
780 return 0;
781 error:
782 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
783 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
784 unregister_netdevice_notifier(&ipvlan_notifier_block);
785 return err;
786 }
787
788 static void __exit ipvlan_cleanup_module(void)
789 {
790 rtnl_link_unregister(&ipvlan_link_ops);
791 unregister_netdevice_notifier(&ipvlan_notifier_block);
792 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
793 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
794 }
795
796 module_init(ipvlan_init_module);
797 module_exit(ipvlan_cleanup_module);
798
799 MODULE_LICENSE("GPL");
800 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
801 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
802 MODULE_ALIAS_RTNL_LINK("ipvlan");