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kernel/printk: Convert to hotplug state machine
[linux/fpc-iii.git] / drivers / net / ipvlan / ipvlan_main.c
blobf442eb366863e034055c8cf773c9b4b0e287ae87
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 static u32 ipvl_nf_hook_refcnt = 0;
13
14 static struct nf_hook_ops ipvl_nfops[] __read_mostly = {
15 {
16 .hook = ipvlan_nf_input,
17 .pf = NFPROTO_IPV4,
18 .hooknum = NF_INET_LOCAL_IN,
19 .priority = INT_MAX,
20 },
21 {
22 .hook = ipvlan_nf_input,
23 .pf = NFPROTO_IPV6,
24 .hooknum = NF_INET_LOCAL_IN,
25 .priority = INT_MAX,
26 },
27 };
28
29 static struct l3mdev_ops ipvl_l3mdev_ops __read_mostly = {
30 .l3mdev_l3_rcv = ipvlan_l3_rcv,
31 };
32
33 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
34 {
35 ipvlan->dev->mtu = dev->mtu - ipvlan->mtu_adj;
36 }
37
38 static int ipvlan_register_nf_hook(void)
39 {
40 int err = 0;
41
42 if (!ipvl_nf_hook_refcnt) {
43 err = _nf_register_hooks(ipvl_nfops, ARRAY_SIZE(ipvl_nfops));
44 if (!err)
45 ipvl_nf_hook_refcnt = 1;
46 } else {
47 ipvl_nf_hook_refcnt++;
48 }
49
50 return err;
51 }
52
53 static void ipvlan_unregister_nf_hook(void)
54 {
55 WARN_ON(!ipvl_nf_hook_refcnt);
56
57 ipvl_nf_hook_refcnt--;
58 if (!ipvl_nf_hook_refcnt)
59 _nf_unregister_hooks(ipvl_nfops, ARRAY_SIZE(ipvl_nfops));
60 }
61
62 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval)
63 {
64 struct ipvl_dev *ipvlan;
65 struct net_device *mdev = port->dev;
66 int err = 0;
67
68 ASSERT_RTNL();
69 if (port->mode != nval) {
70 if (nval == IPVLAN_MODE_L3S) {
71 /* New mode is L3S */
72 err = ipvlan_register_nf_hook();
73 if (!err) {
74 mdev->l3mdev_ops = &ipvl_l3mdev_ops;
75 mdev->priv_flags |= IFF_L3MDEV_MASTER;
76 } else
77 return err;
78 } else if (port->mode == IPVLAN_MODE_L3S) {
79 /* Old mode was L3S */
80 mdev->priv_flags &= ~IFF_L3MDEV_MASTER;
81 ipvlan_unregister_nf_hook();
82 mdev->l3mdev_ops = NULL;
83 }
84 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
85 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S)
86 ipvlan->dev->flags |= IFF_NOARP;
87 else
88 ipvlan->dev->flags &= ~IFF_NOARP;
89 }
90 port->mode = nval;
91 }
92 return err;
93 }
94
95 static int ipvlan_port_create(struct net_device *dev)
96 {
97 struct ipvl_port *port;
98 int err, idx;
99
100 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) {
101 netdev_err(dev, "Master is either lo or non-ether device\n");
102 return -EINVAL;
103 }
104
105 if (netif_is_macvlan_port(dev)) {
106 netdev_err(dev, "Master is a macvlan port.\n");
107 return -EBUSY;
108 }
109
110 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
111 if (!port)
112 return -ENOMEM;
113
114 port->dev = dev;
115 port->mode = IPVLAN_MODE_L3;
116 INIT_LIST_HEAD(&port->ipvlans);
117 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
118 INIT_HLIST_HEAD(&port->hlhead[idx]);
119
120 skb_queue_head_init(&port->backlog);
121 INIT_WORK(&port->wq, ipvlan_process_multicast);
122
123 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
124 if (err)
125 goto err;
126
127 dev->priv_flags |= IFF_IPVLAN_MASTER;
128 return 0;
129
130 err:
131 kfree_rcu(port, rcu);
132 return err;
133 }
134
135 static void ipvlan_port_destroy(struct net_device *dev)
136 {
137 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
138
139 dev->priv_flags &= ~IFF_IPVLAN_MASTER;
140 if (port->mode == IPVLAN_MODE_L3S) {
141 dev->priv_flags &= ~IFF_L3MDEV_MASTER;
142 ipvlan_unregister_nf_hook();
143 dev->l3mdev_ops = NULL;
144 }
145 netdev_rx_handler_unregister(dev);
146 cancel_work_sync(&port->wq);
147 __skb_queue_purge(&port->backlog);
148 kfree_rcu(port, rcu);
149 }
150
151 #define IPVLAN_FEATURES \
152 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
153 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
154 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
155 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
156
157 #define IPVLAN_STATE_MASK \
158 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
159
160 static int ipvlan_init(struct net_device *dev)
161 {
162 struct ipvl_dev *ipvlan = netdev_priv(dev);
163 const struct net_device *phy_dev = ipvlan->phy_dev;
164 struct ipvl_port *port = ipvlan->port;
165
166 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
167 (phy_dev->state & IPVLAN_STATE_MASK);
168 dev->features = phy_dev->features & IPVLAN_FEATURES;
169 dev->features |= NETIF_F_LLTX;
170 dev->gso_max_size = phy_dev->gso_max_size;
171 dev->gso_max_segs = phy_dev->gso_max_segs;
172 dev->hard_header_len = phy_dev->hard_header_len;
173
174 netdev_lockdep_set_classes(dev);
175
176 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats);
177 if (!ipvlan->pcpu_stats)
178 return -ENOMEM;
179
180 port->count += 1;
181
182 return 0;
183 }
184
185 static void ipvlan_uninit(struct net_device *dev)
186 {
187 struct ipvl_dev *ipvlan = netdev_priv(dev);
188 struct ipvl_port *port = ipvlan->port;
189
190 free_percpu(ipvlan->pcpu_stats);
191
192 port->count -= 1;
193 if (!port->count)
194 ipvlan_port_destroy(port->dev);
195 }
196
197 static int ipvlan_open(struct net_device *dev)
198 {
199 struct ipvl_dev *ipvlan = netdev_priv(dev);
200 struct net_device *phy_dev = ipvlan->phy_dev;
201 struct ipvl_addr *addr;
202
203 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
204 ipvlan->port->mode == IPVLAN_MODE_L3S)
205 dev->flags |= IFF_NOARP;
206 else
207 dev->flags &= ~IFF_NOARP;
208
209 list_for_each_entry(addr, &ipvlan->addrs, anode)
210 ipvlan_ht_addr_add(ipvlan, addr);
211
212 return dev_uc_add(phy_dev, phy_dev->dev_addr);
213 }
214
215 static int ipvlan_stop(struct net_device *dev)
216 {
217 struct ipvl_dev *ipvlan = netdev_priv(dev);
218 struct net_device *phy_dev = ipvlan->phy_dev;
219 struct ipvl_addr *addr;
220
221 dev_uc_unsync(phy_dev, dev);
222 dev_mc_unsync(phy_dev, dev);
223
224 dev_uc_del(phy_dev, phy_dev->dev_addr);
225
226 list_for_each_entry(addr, &ipvlan->addrs, anode)
227 ipvlan_ht_addr_del(addr);
228
229 return 0;
230 }
231
232 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
233 struct net_device *dev)
234 {
235 const struct ipvl_dev *ipvlan = netdev_priv(dev);
236 int skblen = skb->len;
237 int ret;
238
239 ret = ipvlan_queue_xmit(skb, dev);
240 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
241 struct ipvl_pcpu_stats *pcptr;
242
243 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
244
245 u64_stats_update_begin(&pcptr->syncp);
246 pcptr->tx_pkts++;
247 pcptr->tx_bytes += skblen;
248 u64_stats_update_end(&pcptr->syncp);
249 } else {
250 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
251 }
252 return ret;
253 }
254
255 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
256 netdev_features_t features)
257 {
258 struct ipvl_dev *ipvlan = netdev_priv(dev);
259
260 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
261 }
262
263 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
264 {
265 struct ipvl_dev *ipvlan = netdev_priv(dev);
266 struct net_device *phy_dev = ipvlan->phy_dev;
267
268 if (change & IFF_ALLMULTI)
269 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
270 }
271
272 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
273 {
274 struct ipvl_dev *ipvlan = netdev_priv(dev);
275
276 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
277 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
278 } else {
279 struct netdev_hw_addr *ha;
280 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
281
282 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
283 netdev_for_each_mc_addr(ha, dev)
284 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
285
286 /* Turn-on broadcast bit irrespective of address family,
287 * since broadcast is deferred to a work-queue, hence no
288 * impact on fast-path processing.
289 */
290 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
291
292 bitmap_copy(ipvlan->mac_filters, mc_filters,
293 IPVLAN_MAC_FILTER_SIZE);
294 }
295 dev_uc_sync(ipvlan->phy_dev, dev);
296 dev_mc_sync(ipvlan->phy_dev, dev);
297 }
298
299 static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev,
300 struct rtnl_link_stats64 *s)
301 {
302 struct ipvl_dev *ipvlan = netdev_priv(dev);
303
304 if (ipvlan->pcpu_stats) {
305 struct ipvl_pcpu_stats *pcptr;
306 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
307 u32 rx_errs = 0, tx_drps = 0;
308 u32 strt;
309 int idx;
310
311 for_each_possible_cpu(idx) {
312 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
313 do {
314 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
315 rx_pkts = pcptr->rx_pkts;
316 rx_bytes = pcptr->rx_bytes;
317 rx_mcast = pcptr->rx_mcast;
318 tx_pkts = pcptr->tx_pkts;
319 tx_bytes = pcptr->tx_bytes;
320 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
321 strt));
322
323 s->rx_packets += rx_pkts;
324 s->rx_bytes += rx_bytes;
325 s->multicast += rx_mcast;
326 s->tx_packets += tx_pkts;
327 s->tx_bytes += tx_bytes;
328
329 /* u32 values are updated without syncp protection. */
330 rx_errs += pcptr->rx_errs;
331 tx_drps += pcptr->tx_drps;
332 }
333 s->rx_errors = rx_errs;
334 s->rx_dropped = rx_errs;
335 s->tx_dropped = tx_drps;
336 }
337 return s;
338 }
339
340 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
341 {
342 struct ipvl_dev *ipvlan = netdev_priv(dev);
343 struct net_device *phy_dev = ipvlan->phy_dev;
344
345 return vlan_vid_add(phy_dev, proto, vid);
346 }
347
348 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
349 u16 vid)
350 {
351 struct ipvl_dev *ipvlan = netdev_priv(dev);
352 struct net_device *phy_dev = ipvlan->phy_dev;
353
354 vlan_vid_del(phy_dev, proto, vid);
355 return 0;
356 }
357
358 static int ipvlan_get_iflink(const struct net_device *dev)
359 {
360 struct ipvl_dev *ipvlan = netdev_priv(dev);
361
362 return ipvlan->phy_dev->ifindex;
363 }
364
365 static const struct net_device_ops ipvlan_netdev_ops = {
366 .ndo_init = ipvlan_init,
367 .ndo_uninit = ipvlan_uninit,
368 .ndo_open = ipvlan_open,
369 .ndo_stop = ipvlan_stop,
370 .ndo_start_xmit = ipvlan_start_xmit,
371 .ndo_fix_features = ipvlan_fix_features,
372 .ndo_change_rx_flags = ipvlan_change_rx_flags,
373 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
374 .ndo_get_stats64 = ipvlan_get_stats64,
375 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
376 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
377 .ndo_get_iflink = ipvlan_get_iflink,
378 };
379
380 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
381 unsigned short type, const void *daddr,
382 const void *saddr, unsigned len)
383 {
384 const struct ipvl_dev *ipvlan = netdev_priv(dev);
385 struct net_device *phy_dev = ipvlan->phy_dev;
386
387 /* TODO Probably use a different field than dev_addr so that the
388 * mac-address on the virtual device is portable and can be carried
389 * while the packets use the mac-addr on the physical device.
390 */
391 return dev_hard_header(skb, phy_dev, type, daddr,
392 saddr ? : dev->dev_addr, len);
393 }
394
395 static const struct header_ops ipvlan_header_ops = {
396 .create = ipvlan_hard_header,
397 .parse = eth_header_parse,
398 .cache = eth_header_cache,
399 .cache_update = eth_header_cache_update,
400 };
401
402 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
403 struct ethtool_link_ksettings *cmd)
404 {
405 const struct ipvl_dev *ipvlan = netdev_priv(dev);
406
407 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
408 }
409
410 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
411 struct ethtool_drvinfo *drvinfo)
412 {
413 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
414 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
415 }
416
417 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
418 {
419 const struct ipvl_dev *ipvlan = netdev_priv(dev);
420
421 return ipvlan->msg_enable;
422 }
423
424 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
425 {
426 struct ipvl_dev *ipvlan = netdev_priv(dev);
427
428 ipvlan->msg_enable = value;
429 }
430
431 static const struct ethtool_ops ipvlan_ethtool_ops = {
432 .get_link = ethtool_op_get_link,
433 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
434 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
435 .get_msglevel = ipvlan_ethtool_get_msglevel,
436 .set_msglevel = ipvlan_ethtool_set_msglevel,
437 };
438
439 static int ipvlan_nl_changelink(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 = ipvlan_port_get_rtnl(ipvlan->phy_dev);
444 int err = 0;
445
446 if (data && data[IFLA_IPVLAN_MODE]) {
447 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
448
449 err = ipvlan_set_port_mode(port, nmode);
450 }
451 return err;
452 }
453
454 static size_t ipvlan_nl_getsize(const struct net_device *dev)
455 {
456 return (0
457 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
458 );
459 }
460
461 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[])
462 {
463 if (data && data[IFLA_IPVLAN_MODE]) {
464 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
465
466 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
467 return -EINVAL;
468 }
469 return 0;
470 }
471
472 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
473 const struct net_device *dev)
474 {
475 struct ipvl_dev *ipvlan = netdev_priv(dev);
476 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
477 int ret = -EINVAL;
478
479 if (!port)
480 goto err;
481
482 ret = -EMSGSIZE;
483 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
484 goto err;
485
486 return 0;
487
488 err:
489 return ret;
490 }
491
492 static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
493 struct nlattr *tb[], struct nlattr *data[])
494 {
495 struct ipvl_dev *ipvlan = netdev_priv(dev);
496 struct ipvl_port *port;
497 struct net_device *phy_dev;
498 int err;
499 u16 mode = IPVLAN_MODE_L3;
500
501 if (!tb[IFLA_LINK])
502 return -EINVAL;
503
504 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
505 if (!phy_dev)
506 return -ENODEV;
507
508 if (netif_is_ipvlan(phy_dev)) {
509 struct ipvl_dev *tmp = netdev_priv(phy_dev);
510
511 phy_dev = tmp->phy_dev;
512 } else if (!netif_is_ipvlan_port(phy_dev)) {
513 err = ipvlan_port_create(phy_dev);
514 if (err < 0)
515 return err;
516 }
517
518 if (data && data[IFLA_IPVLAN_MODE])
519 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
520
521 port = ipvlan_port_get_rtnl(phy_dev);
522 ipvlan->phy_dev = phy_dev;
523 ipvlan->dev = dev;
524 ipvlan->port = port;
525 ipvlan->sfeatures = IPVLAN_FEATURES;
526 ipvlan_adjust_mtu(ipvlan, phy_dev);
527 INIT_LIST_HEAD(&ipvlan->addrs);
528
529 /* TODO Probably put random address here to be presented to the
530 * world but keep using the physical-dev address for the outgoing
531 * packets.
532 */
533 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
534
535 dev->priv_flags |= IFF_IPVLAN_SLAVE;
536
537 err = register_netdevice(dev);
538 if (err < 0)
539 return err;
540
541 err = netdev_upper_dev_link(phy_dev, dev);
542 if (err) {
543 unregister_netdevice(dev);
544 return err;
545 }
546 err = ipvlan_set_port_mode(port, mode);
547 if (err) {
548 unregister_netdevice(dev);
549 return err;
550 }
551
552 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
553 netif_stacked_transfer_operstate(phy_dev, dev);
554 return 0;
555 }
556
557 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
558 {
559 struct ipvl_dev *ipvlan = netdev_priv(dev);
560 struct ipvl_addr *addr, *next;
561
562 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
563 ipvlan_ht_addr_del(addr);
564 list_del(&addr->anode);
565 kfree_rcu(addr, rcu);
566 }
567
568 list_del_rcu(&ipvlan->pnode);
569 unregister_netdevice_queue(dev, head);
570 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
571 }
572
573 static void ipvlan_link_setup(struct net_device *dev)
574 {
575 ether_setup(dev);
576
577 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
578 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
579 dev->netdev_ops = &ipvlan_netdev_ops;
580 dev->destructor = free_netdev;
581 dev->header_ops = &ipvlan_header_ops;
582 dev->ethtool_ops = &ipvlan_ethtool_ops;
583 }
584
585 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
586 {
587 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
588 };
589
590 static struct rtnl_link_ops ipvlan_link_ops = {
591 .kind = "ipvlan",
592 .priv_size = sizeof(struct ipvl_dev),
593
594 .get_size = ipvlan_nl_getsize,
595 .policy = ipvlan_nl_policy,
596 .validate = ipvlan_nl_validate,
597 .fill_info = ipvlan_nl_fillinfo,
598 .changelink = ipvlan_nl_changelink,
599 .maxtype = IFLA_IPVLAN_MAX,
600
601 .setup = ipvlan_link_setup,
602 .newlink = ipvlan_link_new,
603 .dellink = ipvlan_link_delete,
604 };
605
606 static int ipvlan_link_register(struct rtnl_link_ops *ops)
607 {
608 return rtnl_link_register(ops);
609 }
610
611 static int ipvlan_device_event(struct notifier_block *unused,
612 unsigned long event, void *ptr)
613 {
614 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
615 struct ipvl_dev *ipvlan, *next;
616 struct ipvl_port *port;
617 LIST_HEAD(lst_kill);
618
619 if (!netif_is_ipvlan_port(dev))
620 return NOTIFY_DONE;
621
622 port = ipvlan_port_get_rtnl(dev);
623
624 switch (event) {
625 case NETDEV_CHANGE:
626 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
627 netif_stacked_transfer_operstate(ipvlan->phy_dev,
628 ipvlan->dev);
629 break;
630
631 case NETDEV_UNREGISTER:
632 if (dev->reg_state != NETREG_UNREGISTERING)
633 break;
634
635 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
636 pnode)
637 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
638 &lst_kill);
639 unregister_netdevice_many(&lst_kill);
640 break;
641
642 case NETDEV_FEAT_CHANGE:
643 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
644 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
645 ipvlan->dev->gso_max_size = dev->gso_max_size;
646 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
647 netdev_features_change(ipvlan->dev);
648 }
649 break;
650
651 case NETDEV_CHANGEMTU:
652 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
653 ipvlan_adjust_mtu(ipvlan, dev);
654 break;
655
656 case NETDEV_PRE_TYPE_CHANGE:
657 /* Forbid underlying device to change its type. */
658 return NOTIFY_BAD;
659 }
660 return NOTIFY_DONE;
661 }
662
663 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
664 {
665 struct ipvl_addr *addr;
666
667 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
668 netif_err(ipvlan, ifup, ipvlan->dev,
669 "Failed to add IPv6=%pI6c addr for %s intf\n",
670 ip6_addr, ipvlan->dev->name);
671 return -EINVAL;
672 }
673 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
674 if (!addr)
675 return -ENOMEM;
676
677 addr->master = ipvlan;
678 memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr));
679 addr->atype = IPVL_IPV6;
680 list_add_tail(&addr->anode, &ipvlan->addrs);
681
682 /* If the interface is not up, the address will be added to the hash
683 * list by ipvlan_open.
684 */
685 if (netif_running(ipvlan->dev))
686 ipvlan_ht_addr_add(ipvlan, addr);
687
688 return 0;
689 }
690
691 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
692 {
693 struct ipvl_addr *addr;
694
695 addr = ipvlan_find_addr(ipvlan, ip6_addr, true);
696 if (!addr)
697 return;
698
699 ipvlan_ht_addr_del(addr);
700 list_del(&addr->anode);
701 kfree_rcu(addr, rcu);
702
703 return;
704 }
705
706 static int ipvlan_addr6_event(struct notifier_block *unused,
707 unsigned long event, void *ptr)
708 {
709 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
710 struct net_device *dev = (struct net_device *)if6->idev->dev;
711 struct ipvl_dev *ipvlan = netdev_priv(dev);
712
713 /* FIXME IPv6 autoconf calls us from bh without RTNL */
714 if (in_softirq())
715 return NOTIFY_DONE;
716
717 if (!netif_is_ipvlan(dev))
718 return NOTIFY_DONE;
719
720 if (!ipvlan || !ipvlan->port)
721 return NOTIFY_DONE;
722
723 switch (event) {
724 case NETDEV_UP:
725 if (ipvlan_add_addr6(ipvlan, &if6->addr))
726 return NOTIFY_BAD;
727 break;
728
729 case NETDEV_DOWN:
730 ipvlan_del_addr6(ipvlan, &if6->addr);
731 break;
732 }
733
734 return NOTIFY_OK;
735 }
736
737 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
738 {
739 struct ipvl_addr *addr;
740
741 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
742 netif_err(ipvlan, ifup, ipvlan->dev,
743 "Failed to add IPv4=%pI4 on %s intf.\n",
744 ip4_addr, ipvlan->dev->name);
745 return -EINVAL;
746 }
747 addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL);
748 if (!addr)
749 return -ENOMEM;
750
751 addr->master = ipvlan;
752 memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr));
753 addr->atype = IPVL_IPV4;
754 list_add_tail(&addr->anode, &ipvlan->addrs);
755
756 /* If the interface is not up, the address will be added to the hash
757 * list by ipvlan_open.
758 */
759 if (netif_running(ipvlan->dev))
760 ipvlan_ht_addr_add(ipvlan, addr);
761
762 return 0;
763 }
764
765 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
766 {
767 struct ipvl_addr *addr;
768
769 addr = ipvlan_find_addr(ipvlan, ip4_addr, false);
770 if (!addr)
771 return;
772
773 ipvlan_ht_addr_del(addr);
774 list_del(&addr->anode);
775 kfree_rcu(addr, rcu);
776
777 return;
778 }
779
780 static int ipvlan_addr4_event(struct notifier_block *unused,
781 unsigned long event, void *ptr)
782 {
783 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
784 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
785 struct ipvl_dev *ipvlan = netdev_priv(dev);
786 struct in_addr ip4_addr;
787
788 if (!netif_is_ipvlan(dev))
789 return NOTIFY_DONE;
790
791 if (!ipvlan || !ipvlan->port)
792 return NOTIFY_DONE;
793
794 switch (event) {
795 case NETDEV_UP:
796 ip4_addr.s_addr = if4->ifa_address;
797 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
798 return NOTIFY_BAD;
799 break;
800
801 case NETDEV_DOWN:
802 ip4_addr.s_addr = if4->ifa_address;
803 ipvlan_del_addr4(ipvlan, &ip4_addr);
804 break;
805 }
806
807 return NOTIFY_OK;
808 }
809
810 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
811 .notifier_call = ipvlan_addr4_event,
812 };
813
814 static struct notifier_block ipvlan_notifier_block __read_mostly = {
815 .notifier_call = ipvlan_device_event,
816 };
817
818 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
819 .notifier_call = ipvlan_addr6_event,
820 };
821
822 static int __init ipvlan_init_module(void)
823 {
824 int err;
825
826 ipvlan_init_secret();
827 register_netdevice_notifier(&ipvlan_notifier_block);
828 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
829 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
830
831 err = ipvlan_link_register(&ipvlan_link_ops);
832 if (err < 0)
833 goto error;
834
835 return 0;
836 error:
837 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
838 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
839 unregister_netdevice_notifier(&ipvlan_notifier_block);
840 return err;
841 }
842
843 static void __exit ipvlan_cleanup_module(void)
844 {
845 rtnl_link_unregister(&ipvlan_link_ops);
846 unregister_netdevice_notifier(&ipvlan_notifier_block);
847 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
848 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
849 }
850
851 module_init(ipvlan_init_module);
852 module_exit(ipvlan_cleanup_module);
853
854 MODULE_LICENSE("GPL");
855 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
856 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
857 MODULE_ALIAS_RTNL_LINK("ipvlan");
Linux with added FPC-III support