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Merge branch 'neigh_cleanups'
[deliverable/linux.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,
2ad7bf36
MB		 339 .parse = eth_header_parse,
340 .cache = eth_header_cache,
341 .cache_update = eth_header_cache_update,
342};
343
344static int ipvlan_ethtool_get_settings(struct net_device *dev,
345 struct ethtool_cmd *cmd)
346{
347 const struct ipvl_dev *ipvlan = netdev_priv(dev);
348
349 return __ethtool_get_settings(ipvlan->phy_dev, cmd);
350}
351
352static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
353 struct ethtool_drvinfo *drvinfo)
354{
355 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
356 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
357}
358
359static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
360{
361 const struct ipvl_dev *ipvlan = netdev_priv(dev);
362
363 return ipvlan->msg_enable;
364}
365
366static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
367{
368 struct ipvl_dev *ipvlan = netdev_priv(dev);
369
370 ipvlan->msg_enable = value;
371}
372
373static const struct ethtool_ops ipvlan_ethtool_ops = {
374 .get_link = ethtool_op_get_link,
375 .get_settings = ipvlan_ethtool_get_settings,
376 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
377 .get_msglevel = ipvlan_ethtool_get_msglevel,
378 .set_msglevel = ipvlan_ethtool_set_msglevel,
379};
380
381static int ipvlan_nl_changelink(struct net_device *dev,
382 struct nlattr *tb[], struct nlattr *data[])
383{
384 struct ipvl_dev *ipvlan = netdev_priv(dev);
385 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
386
387 if (data && data[IFLA_IPVLAN_MODE]) {
388 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
389
390 ipvlan_set_port_mode(port, nmode);
391 }
392 return 0;
393}
394
395static size_t ipvlan_nl_getsize(const struct net_device *dev)
396{
397 return (0
398 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
399 );
400}
401
402static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[])
403{
404 if (data && data[IFLA_IPVLAN_MODE]) {
405 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
406
407 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
408 return -EINVAL;
409 }
410 return 0;
411}
412
413static int ipvlan_nl_fillinfo(struct sk_buff *skb,
414 const struct net_device *dev)
415{
416 struct ipvl_dev *ipvlan = netdev_priv(dev);
417 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
418 int ret = -EINVAL;
419
420 if (!port)
421 goto err;
422
423 ret = -EMSGSIZE;
424 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
425 goto err;
426
427 return 0;
428
429err:
430 return ret;
431}
432
433static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
434 struct nlattr *tb[], struct nlattr *data[])
435{
436 struct ipvl_dev *ipvlan = netdev_priv(dev);
437 struct ipvl_port *port;
438 struct net_device *phy_dev;
439 int err;
440
441 if (!tb[IFLA_LINK])
442 return -EINVAL;
443
444 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
445 if (!phy_dev)
446 return -ENODEV;
447
5933fea7 448 if (netif_is_ipvlan(phy_dev)) {
2ad7bf36
MB		 449 struct ipvl_dev *tmp = netdev_priv(phy_dev);
450
451 phy_dev = tmp->phy_dev;
5933fea7 452 } else if (!netif_is_ipvlan_port(phy_dev)) {
2ad7bf36
MB		 453 err = ipvlan_port_create(phy_dev);
454 if (err < 0)
455 return err;
456 }
457
458 port = ipvlan_port_get_rtnl(phy_dev);
459 if (data && data[IFLA_IPVLAN_MODE])
460 port->mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
461
462 ipvlan->phy_dev = phy_dev;
463 ipvlan->dev = dev;
464 ipvlan->port = port;
465 ipvlan->sfeatures = IPVLAN_FEATURES;
466 INIT_LIST_HEAD(&ipvlan->addrs);
467 ipvlan->ipv4cnt = 0;
468 ipvlan->ipv6cnt = 0;
469
470 /* TODO Probably put random address here to be presented to the
471 * world but keep using the physical-dev address for the outgoing
472 * packets.
473 */
474 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
475
476 dev->priv_flags |= IFF_IPVLAN_SLAVE;
477
478 port->count += 1;
479 err = register_netdevice(dev);
480 if (err < 0)
481 goto ipvlan_destroy_port;
482
483 err = netdev_upper_dev_link(phy_dev, dev);
484 if (err)
485 goto ipvlan_destroy_port;
486
487 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
488 netif_stacked_transfer_operstate(phy_dev, dev);
489 return 0;
490
491ipvlan_destroy_port:
492 port->count -= 1;
493 if (!port->count)
494 ipvlan_port_destroy(phy_dev);
495
496 return err;
497}
498
499static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
500{
501 struct ipvl_dev *ipvlan = netdev_priv(dev);
502 struct ipvl_addr *addr, *next;
503
504 if (ipvlan->ipv6cnt > 0 || ipvlan->ipv4cnt > 0) {
505 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
506 ipvlan_ht_addr_del(addr, !dev->dismantle);
507 list_del_rcu(&addr->anode);
508 }
509 }
510 list_del_rcu(&ipvlan->pnode);
511 unregister_netdevice_queue(dev, head);
512 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
513}
514
515static void ipvlan_link_setup(struct net_device *dev)
516{
517 ether_setup(dev);
518
519 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
520 dev->priv_flags |= IFF_UNICAST_FLT;
521 dev->netdev_ops = &ipvlan_netdev_ops;
522 dev->destructor = free_netdev;
523 dev->header_ops = &ipvlan_header_ops;
524 dev->ethtool_ops = &ipvlan_ethtool_ops;
525 dev->tx_queue_len = 0;
526}
527
528static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
529{
530 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
531};
532
533static struct rtnl_link_ops ipvlan_link_ops = {
534 .kind = "ipvlan",
535 .priv_size = sizeof(struct ipvl_dev),
536
537 .get_size = ipvlan_nl_getsize,
538 .policy = ipvlan_nl_policy,
539 .validate = ipvlan_nl_validate,
540 .fill_info = ipvlan_nl_fillinfo,
541 .changelink = ipvlan_nl_changelink,
542 .maxtype = IFLA_IPVLAN_MAX,
543
544 .setup = ipvlan_link_setup,
545 .newlink = ipvlan_link_new,
546 .dellink = ipvlan_link_delete,
547};
548
92c7b0de 549static int ipvlan_link_register(struct rtnl_link_ops *ops)
2ad7bf36
MB		 550{
551 return rtnl_link_register(ops);
552}
553
554static int ipvlan_device_event(struct notifier_block *unused,
555 unsigned long event, void *ptr)
556{
557 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
558 struct ipvl_dev *ipvlan, *next;
559 struct ipvl_port *port;
560 LIST_HEAD(lst_kill);
561
5933fea7 562 if (!netif_is_ipvlan_port(dev))
2ad7bf36
MB		 563 return NOTIFY_DONE;
564
565 port = ipvlan_port_get_rtnl(dev);
566
567 switch (event) {
568 case NETDEV_CHANGE:
569 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
570 netif_stacked_transfer_operstate(ipvlan->phy_dev,
571 ipvlan->dev);
572 break;
573
574 case NETDEV_UNREGISTER:
575 if (dev->reg_state != NETREG_UNREGISTERING)
576 break;
577
578 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
579 pnode)
580 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
581 &lst_kill);
582 unregister_netdevice_many(&lst_kill);
583 break;
584
585 case NETDEV_FEAT_CHANGE:
586 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
587 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
588 ipvlan->dev->gso_max_size = dev->gso_max_size;
589 netdev_features_change(ipvlan->dev);
590 }
591 break;
592
593 case NETDEV_CHANGEMTU:
594 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
595 ipvlan_adjust_mtu(ipvlan, dev);
596 break;
597
598 case NETDEV_PRE_TYPE_CHANGE:
599 /* Forbid underlying device to change its type. */
600 return NOTIFY_BAD;
601 }
602 return NOTIFY_DONE;
603}
604
605static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
606{
607 struct ipvl_addr *addr;
608
609 if (ipvlan_addr_busy(ipvlan, ip6_addr, true)) {
610 netif_err(ipvlan, ifup, ipvlan->dev,
611 "Failed to add IPv6=%pI6c addr for %s intf\n",
612 ip6_addr, ipvlan->dev->name);
613 return -EINVAL;
614 }
615 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
616 if (!addr)
617 return -ENOMEM;
618
619 addr->master = ipvlan;
620 memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr));
621 addr->atype = IPVL_IPV6;
622 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
623 ipvlan->ipv6cnt++;
624 ipvlan_ht_addr_add(ipvlan, addr);
625
626 return 0;
627}
628
629static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
630{
631 struct ipvl_addr *addr;
632
633 addr = ipvlan_ht_addr_lookup(ipvlan->port, ip6_addr, true);
634 if (!addr)
635 return;
636
637 ipvlan_ht_addr_del(addr, true);
638 list_del_rcu(&addr->anode);
639 ipvlan->ipv6cnt--;
640 WARN_ON(ipvlan->ipv6cnt < 0);
641 kfree_rcu(addr, rcu);
642
643 return;
644}
645
646static int ipvlan_addr6_event(struct notifier_block *unused,
647 unsigned long event, void *ptr)
648{
649 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
650 struct net_device *dev = (struct net_device *)if6->idev->dev;
651 struct ipvl_dev *ipvlan = netdev_priv(dev);
652
5933fea7 653 if (!netif_is_ipvlan(dev))
2ad7bf36
MB		 654 return NOTIFY_DONE;
655
656 if (!ipvlan || !ipvlan->port)
657 return NOTIFY_DONE;
658
659 switch (event) {
660 case NETDEV_UP:
661 if (ipvlan_add_addr6(ipvlan, &if6->addr))
662 return NOTIFY_BAD;
663 break;
664
665 case NETDEV_DOWN:
666 ipvlan_del_addr6(ipvlan, &if6->addr);
667 break;
668 }
669
670 return NOTIFY_OK;
671}
672
673static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
674{
675 struct ipvl_addr *addr;
676
677 if (ipvlan_addr_busy(ipvlan, ip4_addr, false)) {
678 netif_err(ipvlan, ifup, ipvlan->dev,
679 "Failed to add IPv4=%pI4 on %s intf.\n",
680 ip4_addr, ipvlan->dev->name);
681 return -EINVAL;
682 }
683 addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL);
684 if (!addr)
685 return -ENOMEM;
686
687 addr->master = ipvlan;
688 memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr));
689 addr->atype = IPVL_IPV4;
690 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
691 ipvlan->ipv4cnt++;
692 ipvlan_ht_addr_add(ipvlan, addr);
693 ipvlan_set_broadcast_mac_filter(ipvlan, true);
694
695 return 0;
696}
697
698static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
699{
700 struct ipvl_addr *addr;
701
702 addr = ipvlan_ht_addr_lookup(ipvlan->port, ip4_addr, false);
703 if (!addr)
704 return;
705
706 ipvlan_ht_addr_del(addr, true);
707 list_del_rcu(&addr->anode);
708 ipvlan->ipv4cnt--;
709 WARN_ON(ipvlan->ipv4cnt < 0);
710 if (!ipvlan->ipv4cnt)
711 ipvlan_set_broadcast_mac_filter(ipvlan, false);
712 kfree_rcu(addr, rcu);
713
714 return;
715}
716
717static int ipvlan_addr4_event(struct notifier_block *unused,
718 unsigned long event, void *ptr)
719{
720 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
721 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
722 struct ipvl_dev *ipvlan = netdev_priv(dev);
723 struct in_addr ip4_addr;
724
5933fea7 725 if (!netif_is_ipvlan(dev))
2ad7bf36
MB		 726 return NOTIFY_DONE;
727
728 if (!ipvlan || !ipvlan->port)
729 return NOTIFY_DONE;
730
731 switch (event) {
732 case NETDEV_UP:
733 ip4_addr.s_addr = if4->ifa_address;
734 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
735 return NOTIFY_BAD;
736 break;
737
738 case NETDEV_DOWN:
739 ip4_addr.s_addr = if4->ifa_address;
740 ipvlan_del_addr4(ipvlan, &ip4_addr);
741 break;
742 }
743
744 return NOTIFY_OK;
745}
746
747static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
748 .notifier_call = ipvlan_addr4_event,
749};
750
751static struct notifier_block ipvlan_notifier_block __read_mostly = {
752 .notifier_call = ipvlan_device_event,
753};
754
755static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
756 .notifier_call = ipvlan_addr6_event,
757};
758
759static int __init ipvlan_init_module(void)
760{
761 int err;
762
763 ipvlan_init_secret();
764 register_netdevice_notifier(&ipvlan_notifier_block);
765 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
766 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
767
768 err = ipvlan_link_register(&ipvlan_link_ops);
769 if (err < 0)
770 goto error;
771
772 return 0;
773error:
774 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
775 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
776 unregister_netdevice_notifier(&ipvlan_notifier_block);
777 return err;
778}
779
780static void __exit ipvlan_cleanup_module(void)
781{
782 rtnl_link_unregister(&ipvlan_link_ops);
783 unregister_netdevice_notifier(&ipvlan_notifier_block);
784 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
785 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
786}
787
788module_init(ipvlan_init_module);
789module_exit(ipvlan_cleanup_module);
790
791MODULE_LICENSE("GPL");
792MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
793MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
794MODULE_ALIAS_RTNL_LINK("ipvlan");
Linux kernel - Deliverables
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