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ipvlan: play well with macvlan device
[linux-2.6-block.git] / drivers / net / ipvlan / ipvlan_main.c
CommitLineData
2ad7bf36
MB		 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
12void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
13{
14 ipvlan->dev->mtu = dev->mtu - ipvlan->mtu_adj;
15}
16
17void 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
32static 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 }
764e433b
MB		 41
42 if (netif_is_macvlan_port(dev)) {
43 netdev_err(dev, "Master is a macvlan port.\n");
44 return -EBUSY;
45 }
46
2ad7bf36
MB		 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
64err:
65 kfree_rcu(port, rcu);
66 return err;
67}
68
69static 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 */
82static struct lock_class_key ipvlan_netdev_xmit_lock_key;
83static 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
94static 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
101static 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
107static 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
129static void ipvlan_uninit(struct net_device *dev)
130{
131 struct ipvl_dev *ipvlan = netdev_priv(dev);
132 struct ipvl_port *port = ipvlan->port;
133
04901cea 134 free_percpu(ipvlan->pcpu_stats);
2ad7bf36
MB		 135
136 port->count -= 1;
137 if (!port->count)
138 ipvlan_port_destroy(port->dev);
139}
140
141static 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
159static 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
92c7b0de
MB		 177static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
178 struct net_device *dev)
2ad7bf36
MB		 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
200static 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
208static 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
217static 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
228static 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
249static 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
290static 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
298static 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
308static 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
322static 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
337static 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
345static 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
353static 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
360static 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
367static 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
374static 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
382static 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
396static 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
403static 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
414static 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
430err:
431 return ret;
432}
433
434static 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 (ipvlan_dev_slave(phy_dev)) {
450 struct ipvl_dev *tmp = netdev_priv(phy_dev);
451
452 phy_dev = tmp->phy_dev;
453 } else if (!ipvlan_dev_master(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
492ipvlan_destroy_port:
493 port->count -= 1;
494 if (!port->count)
495 ipvlan_port_destroy(phy_dev);
496
497 return err;
498}
499
500static 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
516static 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
529static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
530{
531 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
532};
533
534static 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
92c7b0de 550static int ipvlan_link_register(struct rtnl_link_ops *ops)
2ad7bf36
MB		 551{
552 return rtnl_link_register(ops);
553}
554
555static 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 (!ipvlan_dev_master(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
606static 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
630static 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
647static 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 (!ipvlan_dev_slave(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
674static 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
699static 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
718static 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 (!ipvlan_dev_slave(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
748static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
749 .notifier_call = ipvlan_addr4_event,
750};
751
752static struct notifier_block ipvlan_notifier_block __read_mostly = {
753 .notifier_call = ipvlan_device_event,
754};
755
756static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
757 .notifier_call = ipvlan_addr6_event,
758};
759
760static 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;
774error:
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
781static 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
789module_init(ipvlan_init_module);
790module_exit(ipvlan_cleanup_module);
791
792MODULE_LICENSE("GPL");
793MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
794MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
795MODULE_ALIAS_RTNL_LINK("ipvlan");
Linux 6.x block layer and io_uring tree(s)