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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
12static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
13{
14 ipvlan->dev->mtu = dev->mtu - ipvlan->mtu_adj;
15}
16
17static void ipvlan_set_port_mode(struct ipvl_port *port, u16 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 }
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
67err:
68 kfree_rcu(port, rcu);
69 return err;
70}
71
72static 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 */
87static struct lock_class_key ipvlan_netdev_xmit_lock_key;
88static struct lock_class_key ipvlan_netdev_addr_lock_key;
89
90#define IPVLAN_FEATURES \
91 (NETIF_F_SG | NETIF_F_HW_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
99static 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
106static 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
112static 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->gso_max_segs = phy_dev->gso_max_segs;
123 dev->hard_header_len = phy_dev->hard_header_len;
124
125 ipvlan_set_lockdep_class(dev);
126
127 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats);
128 if (!ipvlan->pcpu_stats)
129 return -ENOMEM;
130
131 return 0;
132}
133
134static void ipvlan_uninit(struct net_device *dev)
135{
136 struct ipvl_dev *ipvlan = netdev_priv(dev);
137 struct ipvl_port *port = ipvlan->port;
138
139 free_percpu(ipvlan->pcpu_stats);
140
141 port->count -= 1;
142 if (!port->count)
143 ipvlan_port_destroy(port->dev);
144}
145
146static int ipvlan_open(struct net_device *dev)
147{
148 struct ipvl_dev *ipvlan = netdev_priv(dev);
149 struct net_device *phy_dev = ipvlan->phy_dev;
150 struct ipvl_addr *addr;
151
152 if (ipvlan->port->mode == IPVLAN_MODE_L3)
153 dev->flags |= IFF_NOARP;
154 else
155 dev->flags &= ~IFF_NOARP;
156
157 list_for_each_entry(addr, &ipvlan->addrs, anode)
158 ipvlan_ht_addr_add(ipvlan, addr);
159
160 return dev_uc_add(phy_dev, phy_dev->dev_addr);
161}
162
163static int ipvlan_stop(struct net_device *dev)
164{
165 struct ipvl_dev *ipvlan = netdev_priv(dev);
166 struct net_device *phy_dev = ipvlan->phy_dev;
167 struct ipvl_addr *addr;
168
169 dev_uc_unsync(phy_dev, dev);
170 dev_mc_unsync(phy_dev, dev);
171
172 dev_uc_del(phy_dev, phy_dev->dev_addr);
173
174 list_for_each_entry(addr, &ipvlan->addrs, anode)
175 ipvlan_ht_addr_del(addr);
176
177 return 0;
178}
179
180static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
181 struct net_device *dev)
182{
183 const struct ipvl_dev *ipvlan = netdev_priv(dev);
184 int skblen = skb->len;
185 int ret;
186
187 ret = ipvlan_queue_xmit(skb, dev);
188 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
189 struct ipvl_pcpu_stats *pcptr;
190
191 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
192
193 u64_stats_update_begin(&pcptr->syncp);
194 pcptr->tx_pkts++;
195 pcptr->tx_bytes += skblen;
196 u64_stats_update_end(&pcptr->syncp);
197 } else {
198 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
199 }
200 return ret;
201}
202
203static netdev_features_t ipvlan_fix_features(struct net_device *dev,
204 netdev_features_t features)
205{
206 struct ipvl_dev *ipvlan = netdev_priv(dev);
207
208 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
209}
210
211static void ipvlan_change_rx_flags(struct net_device *dev, int change)
212{
213 struct ipvl_dev *ipvlan = netdev_priv(dev);
214 struct net_device *phy_dev = ipvlan->phy_dev;
215
216 if (change & IFF_ALLMULTI)
217 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
218}
219
220static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
221{
222 struct ipvl_dev *ipvlan = netdev_priv(dev);
223
224 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
225 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
226 } else {
227 struct netdev_hw_addr *ha;
228 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
229
230 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
231 netdev_for_each_mc_addr(ha, dev)
232 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
233
234 /* Turn-on broadcast bit irrespective of address family,
235 * since broadcast is deferred to a work-queue, hence no
236 * impact on fast-path processing.
237 */
238 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
239
240 bitmap_copy(ipvlan->mac_filters, mc_filters,
241 IPVLAN_MAC_FILTER_SIZE);
242 }
243 dev_uc_sync(ipvlan->phy_dev, dev);
244 dev_mc_sync(ipvlan->phy_dev, dev);
245}
246
247static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev,
248 struct rtnl_link_stats64 *s)
249{
250 struct ipvl_dev *ipvlan = netdev_priv(dev);
251
252 if (ipvlan->pcpu_stats) {
253 struct ipvl_pcpu_stats *pcptr;
254 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
255 u32 rx_errs = 0, tx_drps = 0;
256 u32 strt;
257 int idx;
258
259 for_each_possible_cpu(idx) {
260 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
261 do {
262 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
263 rx_pkts = pcptr->rx_pkts;
264 rx_bytes = pcptr->rx_bytes;
265 rx_mcast = pcptr->rx_mcast;
266 tx_pkts = pcptr->tx_pkts;
267 tx_bytes = pcptr->tx_bytes;
268 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
269 strt));
270
271 s->rx_packets += rx_pkts;
272 s->rx_bytes += rx_bytes;
273 s->multicast += rx_mcast;
274 s->tx_packets += tx_pkts;
275 s->tx_bytes += tx_bytes;
276
277 /* u32 values are updated without syncp protection. */
278 rx_errs += pcptr->rx_errs;
279 tx_drps += pcptr->tx_drps;
280 }
281 s->rx_errors = rx_errs;
282 s->rx_dropped = rx_errs;
283 s->tx_dropped = tx_drps;
284 }
285 return s;
286}
287
288static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
289{
290 struct ipvl_dev *ipvlan = netdev_priv(dev);
291 struct net_device *phy_dev = ipvlan->phy_dev;
292
293 return vlan_vid_add(phy_dev, proto, vid);
294}
295
296static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
297 u16 vid)
298{
299 struct ipvl_dev *ipvlan = netdev_priv(dev);
300 struct net_device *phy_dev = ipvlan->phy_dev;
301
302 vlan_vid_del(phy_dev, proto, vid);
303 return 0;
304}
305
306static int ipvlan_get_iflink(const struct net_device *dev)
307{
308 struct ipvl_dev *ipvlan = netdev_priv(dev);
309
310 return ipvlan->phy_dev->ifindex;
311}
312
313static const struct net_device_ops ipvlan_netdev_ops = {
314 .ndo_init = ipvlan_init,
315 .ndo_uninit = ipvlan_uninit,
316 .ndo_open = ipvlan_open,
317 .ndo_stop = ipvlan_stop,
318 .ndo_start_xmit = ipvlan_start_xmit,
319 .ndo_fix_features = ipvlan_fix_features,
320 .ndo_change_rx_flags = ipvlan_change_rx_flags,
321 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
322 .ndo_get_stats64 = ipvlan_get_stats64,
323 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
324 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
325 .ndo_get_iflink = ipvlan_get_iflink,
326};
327
328static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
329 unsigned short type, const void *daddr,
330 const void *saddr, unsigned len)
331{
332 const struct ipvl_dev *ipvlan = netdev_priv(dev);
333 struct net_device *phy_dev = ipvlan->phy_dev;
334
335 /* TODO Probably use a different field than dev_addr so that the
336 * mac-address on the virtual device is portable and can be carried
337 * while the packets use the mac-addr on the physical device.
338 */
339 return dev_hard_header(skb, phy_dev, type, daddr,
340 saddr ? : dev->dev_addr, len);
341}
342
343static const struct header_ops ipvlan_header_ops = {
344 .create = ipvlan_hard_header,
345 .parse = eth_header_parse,
346 .cache = eth_header_cache,
347 .cache_update = eth_header_cache_update,
348};
349
350static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
351 struct ethtool_link_ksettings *cmd)
352{
353 const struct ipvl_dev *ipvlan = netdev_priv(dev);
354
355 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
356}
357
358static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
359 struct ethtool_drvinfo *drvinfo)
360{
361 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
362 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
363}
364
365static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
366{
367 const struct ipvl_dev *ipvlan = netdev_priv(dev);
368
369 return ipvlan->msg_enable;
370}
371
372static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
373{
374 struct ipvl_dev *ipvlan = netdev_priv(dev);
375
376 ipvlan->msg_enable = value;
377}
378
379static const struct ethtool_ops ipvlan_ethtool_ops = {
380 .get_link = ethtool_op_get_link,
381 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
382 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
383 .get_msglevel = ipvlan_ethtool_get_msglevel,
384 .set_msglevel = ipvlan_ethtool_set_msglevel,
385};
386
387static int ipvlan_nl_changelink(struct net_device *dev,
388 struct nlattr *tb[], struct nlattr *data[])
389{
390 struct ipvl_dev *ipvlan = netdev_priv(dev);
391 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
392
393 if (data && data[IFLA_IPVLAN_MODE]) {
394 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
395
396 ipvlan_set_port_mode(port, nmode);
397 }
398 return 0;
399}
400
401static size_t ipvlan_nl_getsize(const struct net_device *dev)
402{
403 return (0
404 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
405 );
406}
407
408static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[])
409{
410 if (data && data[IFLA_IPVLAN_MODE]) {
411 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
412
413 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
414 return -EINVAL;
415 }
416 return 0;
417}
418
419static int ipvlan_nl_fillinfo(struct sk_buff *skb,
420 const struct net_device *dev)
421{
422 struct ipvl_dev *ipvlan = netdev_priv(dev);
423 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
424 int ret = -EINVAL;
425
426 if (!port)
427 goto err;
428
429 ret = -EMSGSIZE;
430 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
431 goto err;
432
433 return 0;
434
435err:
436 return ret;
437}
438
439static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
440 struct nlattr *tb[], struct nlattr *data[])
441{
442 struct ipvl_dev *ipvlan = netdev_priv(dev);
443 struct ipvl_port *port;
444 struct net_device *phy_dev;
445 int err;
446 u16 mode = IPVLAN_MODE_L3;
447
448 if (!tb[IFLA_LINK])
449 return -EINVAL;
450
451 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
452 if (!phy_dev)
453 return -ENODEV;
454
455 if (netif_is_ipvlan(phy_dev)) {
456 struct ipvl_dev *tmp = netdev_priv(phy_dev);
457
458 phy_dev = tmp->phy_dev;
459 } else if (!netif_is_ipvlan_port(phy_dev)) {
460 err = ipvlan_port_create(phy_dev);
461 if (err < 0)
462 return err;
463 }
464
465 if (data && data[IFLA_IPVLAN_MODE])
466 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
467
468 port = ipvlan_port_get_rtnl(phy_dev);
469 ipvlan->phy_dev = phy_dev;
470 ipvlan->dev = dev;
471 ipvlan->port = port;
472 ipvlan->sfeatures = IPVLAN_FEATURES;
473 ipvlan_adjust_mtu(ipvlan, phy_dev);
474 INIT_LIST_HEAD(&ipvlan->addrs);
475
476 /* TODO Probably put random address here to be presented to the
477 * world but keep using the physical-dev address for the outgoing
478 * packets.
479 */
480 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
481
482 dev->priv_flags |= IFF_IPVLAN_SLAVE;
483
484 port->count += 1;
485 err = register_netdevice(dev);
486 if (err < 0)
487 goto ipvlan_destroy_port;
488
489 err = netdev_upper_dev_link(phy_dev, dev);
490 if (err)
491 goto ipvlan_destroy_port;
492
493 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
494 ipvlan_set_port_mode(port, mode);
495
496 netif_stacked_transfer_operstate(phy_dev, dev);
497 return 0;
498
499ipvlan_destroy_port:
500 port->count -= 1;
501 if (!port->count)
502 ipvlan_port_destroy(phy_dev);
503
504 return err;
505}
506
507static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
508{
509 struct ipvl_dev *ipvlan = netdev_priv(dev);
510 struct ipvl_addr *addr, *next;
511
512 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
513 ipvlan_ht_addr_del(addr);
514 list_del(&addr->anode);
515 kfree_rcu(addr, rcu);
516 }
517
518 list_del_rcu(&ipvlan->pnode);
519 unregister_netdevice_queue(dev, head);
520 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
521}
522
523static void ipvlan_link_setup(struct net_device *dev)
524{
525 ether_setup(dev);
526
527 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
528 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
529 dev->netdev_ops = &ipvlan_netdev_ops;
530 dev->destructor = free_netdev;
531 dev->header_ops = &ipvlan_header_ops;
532 dev->ethtool_ops = &ipvlan_ethtool_ops;
533}
534
535static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
536{
537 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
538};
539
540static struct rtnl_link_ops ipvlan_link_ops = {
541 .kind = "ipvlan",
542 .priv_size = sizeof(struct ipvl_dev),
543
544 .get_size = ipvlan_nl_getsize,
545 .policy = ipvlan_nl_policy,
546 .validate = ipvlan_nl_validate,
547 .fill_info = ipvlan_nl_fillinfo,
548 .changelink = ipvlan_nl_changelink,
549 .maxtype = IFLA_IPVLAN_MAX,
550
551 .setup = ipvlan_link_setup,
552 .newlink = ipvlan_link_new,
553 .dellink = ipvlan_link_delete,
554};
555
556static int ipvlan_link_register(struct rtnl_link_ops *ops)
557{
558 return rtnl_link_register(ops);
559}
560
561static int ipvlan_device_event(struct notifier_block *unused,
562 unsigned long event, void *ptr)
563{
564 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
565 struct ipvl_dev *ipvlan, *next;
566 struct ipvl_port *port;
567 LIST_HEAD(lst_kill);
568
569 if (!netif_is_ipvlan_port(dev))
570 return NOTIFY_DONE;
571
572 port = ipvlan_port_get_rtnl(dev);
573
574 switch (event) {
575 case NETDEV_CHANGE:
576 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
577 netif_stacked_transfer_operstate(ipvlan->phy_dev,
578 ipvlan->dev);
579 break;
580
581 case NETDEV_UNREGISTER:
582 if (dev->reg_state != NETREG_UNREGISTERING)
583 break;
584
585 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
586 pnode)
587 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
588 &lst_kill);
589 unregister_netdevice_many(&lst_kill);
590 break;
591
592 case NETDEV_FEAT_CHANGE:
593 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
594 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
595 ipvlan->dev->gso_max_size = dev->gso_max_size;
596 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
597 netdev_features_change(ipvlan->dev);
598 }
599 break;
600
601 case NETDEV_CHANGEMTU:
602 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
603 ipvlan_adjust_mtu(ipvlan, dev);
604 break;
605
606 case NETDEV_PRE_TYPE_CHANGE:
607 /* Forbid underlying device to change its type. */
608 return NOTIFY_BAD;
609 }
610 return NOTIFY_DONE;
611}
612
613static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
614{
615 struct ipvl_addr *addr;
616
617 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
618 netif_err(ipvlan, ifup, ipvlan->dev,
619 "Failed to add IPv6=%pI6c addr for %s intf\n",
620 ip6_addr, ipvlan->dev->name);
621 return -EINVAL;
622 }
623 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
624 if (!addr)
625 return -ENOMEM;
626
627 addr->master = ipvlan;
628 memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr));
629 addr->atype = IPVL_IPV6;
630 list_add_tail(&addr->anode, &ipvlan->addrs);
631
632 /* If the interface is not up, the address will be added to the hash
633 * list by ipvlan_open.
634 */
635 if (netif_running(ipvlan->dev))
636 ipvlan_ht_addr_add(ipvlan, addr);
637
638 return 0;
639}
640
641static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
642{
643 struct ipvl_addr *addr;
644
645 addr = ipvlan_find_addr(ipvlan, ip6_addr, true);
646 if (!addr)
647 return;
648
649 ipvlan_ht_addr_del(addr);
650 list_del(&addr->anode);
651 kfree_rcu(addr, rcu);
652
653 return;
654}
655
656static int ipvlan_addr6_event(struct notifier_block *unused,
657 unsigned long event, void *ptr)
658{
659 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
660 struct net_device *dev = (struct net_device *)if6->idev->dev;
661 struct ipvl_dev *ipvlan = netdev_priv(dev);
662
663 /* FIXME IPv6 autoconf calls us from bh without RTNL */
664 if (in_softirq())
665 return NOTIFY_DONE;
666
667 if (!netif_is_ipvlan(dev))
668 return NOTIFY_DONE;
669
670 if (!ipvlan || !ipvlan->port)
671 return NOTIFY_DONE;
672
673 switch (event) {
674 case NETDEV_UP:
675 if (ipvlan_add_addr6(ipvlan, &if6->addr))
676 return NOTIFY_BAD;
677 break;
678
679 case NETDEV_DOWN:
680 ipvlan_del_addr6(ipvlan, &if6->addr);
681 break;
682 }
683
684 return NOTIFY_OK;
685}
686
687static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
688{
689 struct ipvl_addr *addr;
690
691 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
692 netif_err(ipvlan, ifup, ipvlan->dev,
693 "Failed to add IPv4=%pI4 on %s intf.\n",
694 ip4_addr, ipvlan->dev->name);
695 return -EINVAL;
696 }
697 addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL);
698 if (!addr)
699 return -ENOMEM;
700
701 addr->master = ipvlan;
702 memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr));
703 addr->atype = IPVL_IPV4;
704 list_add_tail(&addr->anode, &ipvlan->addrs);
705
706 /* If the interface is not up, the address will be added to the hash
707 * list by ipvlan_open.
708 */
709 if (netif_running(ipvlan->dev))
710 ipvlan_ht_addr_add(ipvlan, addr);
711
712 return 0;
713}
714
715static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
716{
717 struct ipvl_addr *addr;
718
719 addr = ipvlan_find_addr(ipvlan, ip4_addr, false);
720 if (!addr)
721 return;
722
723 ipvlan_ht_addr_del(addr);
724 list_del(&addr->anode);
725 kfree_rcu(addr, rcu);
726
727 return;
728}
729
730static int ipvlan_addr4_event(struct notifier_block *unused,
731 unsigned long event, void *ptr)
732{
733 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
734 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
735 struct ipvl_dev *ipvlan = netdev_priv(dev);
736 struct in_addr ip4_addr;
737
738 if (!netif_is_ipvlan(dev))
739 return NOTIFY_DONE;
740
741 if (!ipvlan || !ipvlan->port)
742 return NOTIFY_DONE;
743
744 switch (event) {
745 case NETDEV_UP:
746 ip4_addr.s_addr = if4->ifa_address;
747 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
748 return NOTIFY_BAD;
749 break;
750
751 case NETDEV_DOWN:
752 ip4_addr.s_addr = if4->ifa_address;
753 ipvlan_del_addr4(ipvlan, &ip4_addr);
754 break;
755 }
756
757 return NOTIFY_OK;
758}
759
760static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
761 .notifier_call = ipvlan_addr4_event,
762};
763
764static struct notifier_block ipvlan_notifier_block __read_mostly = {
765 .notifier_call = ipvlan_device_event,
766};
767
768static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
769 .notifier_call = ipvlan_addr6_event,
770};
771
772static int __init ipvlan_init_module(void)
773{
774 int err;
775
776 ipvlan_init_secret();
777 register_netdevice_notifier(&ipvlan_notifier_block);
778 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
779 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
780
781 err = ipvlan_link_register(&ipvlan_link_ops);
782 if (err < 0)
783 goto error;
784
785 return 0;
786error:
787 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
788 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
789 unregister_netdevice_notifier(&ipvlan_notifier_block);
790 return err;
791}
792
793static void __exit ipvlan_cleanup_module(void)
794{
795 rtnl_link_unregister(&ipvlan_link_ops);
796 unregister_netdevice_notifier(&ipvlan_notifier_block);
797 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
798 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
799}
800
801module_init(ipvlan_init_module);
802module_exit(ipvlan_cleanup_module);
803
804MODULE_LICENSE("GPL");
805MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
806MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
807MODULE_ALIAS_RTNL_LINK("ipvlan");