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[mirror_ubuntu-artful-kernel.git] / drivers / net / ipvlan / ipvlan_main.c
1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License as
5 * published by the Free Software Foundation; either version 2 of
6 * the License, or (at your option) any later version.
7 *
8 */
9
10 #include "ipvlan.h"
11
12 static unsigned int ipvlan_netid __read_mostly;
13
14 struct ipvlan_netns {
15 unsigned int ipvl_nf_hook_refcnt;
16 };
17
18 static struct nf_hook_ops ipvl_nfops[] __read_mostly = {
19 {
20 .hook = ipvlan_nf_input,
21 .pf = NFPROTO_IPV4,
22 .hooknum = NF_INET_LOCAL_IN,
23 .priority = INT_MAX,
24 },
25 {
26 .hook = ipvlan_nf_input,
27 .pf = NFPROTO_IPV6,
28 .hooknum = NF_INET_LOCAL_IN,
29 .priority = INT_MAX,
30 },
31 };
32
33 static const struct l3mdev_ops ipvl_l3mdev_ops = {
34 .l3mdev_l3_rcv = ipvlan_l3_rcv,
35 };
36
37 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
38 {
39 ipvlan->dev->mtu = dev->mtu;
40 }
41
42 static int ipvlan_register_nf_hook(struct net *net)
43 {
44 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
45 int err = 0;
46
47 if (!vnet->ipvl_nf_hook_refcnt) {
48 err = nf_register_net_hooks(net, ipvl_nfops,
49 ARRAY_SIZE(ipvl_nfops));
50 if (!err)
51 vnet->ipvl_nf_hook_refcnt = 1;
52 } else {
53 vnet->ipvl_nf_hook_refcnt++;
54 }
55
56 return err;
57 }
58
59 static void ipvlan_unregister_nf_hook(struct net *net)
60 {
61 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
62
63 if (WARN_ON(!vnet->ipvl_nf_hook_refcnt))
64 return;
65
66 vnet->ipvl_nf_hook_refcnt--;
67 if (!vnet->ipvl_nf_hook_refcnt)
68 nf_unregister_net_hooks(net, ipvl_nfops,
69 ARRAY_SIZE(ipvl_nfops));
70 }
71
72 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval)
73 {
74 struct ipvl_dev *ipvlan;
75 struct net_device *mdev = port->dev;
76 int err = 0;
77
78 ASSERT_RTNL();
79 if (port->mode != nval) {
80 if (nval == IPVLAN_MODE_L3S) {
81 /* New mode is L3S */
82 err = ipvlan_register_nf_hook(read_pnet(&port->pnet));
83 if (!err) {
84 mdev->l3mdev_ops = &ipvl_l3mdev_ops;
85 mdev->priv_flags |= IFF_L3MDEV_MASTER;
86 } else
87 return err;
88 } else if (port->mode == IPVLAN_MODE_L3S) {
89 /* Old mode was L3S */
90 mdev->priv_flags &= ~IFF_L3MDEV_MASTER;
91 ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
92 mdev->l3mdev_ops = NULL;
93 }
94 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
95 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S)
96 ipvlan->dev->flags |= IFF_NOARP;
97 else
98 ipvlan->dev->flags &= ~IFF_NOARP;
99 }
100 port->mode = nval;
101 }
102 return err;
103 }
104
105 static int ipvlan_port_create(struct net_device *dev)
106 {
107 struct ipvl_port *port;
108 int err, idx;
109
110 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) {
111 netdev_err(dev, "Master is either lo or non-ether device\n");
112 return -EINVAL;
113 }
114
115 if (netdev_is_rx_handler_busy(dev)) {
116 netdev_err(dev, "Device is already in use.\n");
117 return -EBUSY;
118 }
119
120 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
121 if (!port)
122 return -ENOMEM;
123
124 write_pnet(&port->pnet, dev_net(dev));
125 port->dev = dev;
126 port->mode = IPVLAN_MODE_L3;
127 INIT_LIST_HEAD(&port->ipvlans);
128 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
129 INIT_HLIST_HEAD(&port->hlhead[idx]);
130
131 skb_queue_head_init(&port->backlog);
132 INIT_WORK(&port->wq, ipvlan_process_multicast);
133 ida_init(&port->ida);
134 port->dev_id_start = 1;
135
136 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
137 if (err)
138 goto err;
139
140 dev->priv_flags |= IFF_IPVLAN_MASTER;
141 return 0;
142
143 err:
144 kfree(port);
145 return err;
146 }
147
148 static void ipvlan_port_destroy(struct net_device *dev)
149 {
150 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
151 struct sk_buff *skb;
152
153 dev->priv_flags &= ~IFF_IPVLAN_MASTER;
154 if (port->mode == IPVLAN_MODE_L3S) {
155 dev->priv_flags &= ~IFF_L3MDEV_MASTER;
156 ipvlan_unregister_nf_hook(dev_net(dev));
157 dev->l3mdev_ops = NULL;
158 }
159 netdev_rx_handler_unregister(dev);
160 cancel_work_sync(&port->wq);
161 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
162 if (skb->dev)
163 dev_put(skb->dev);
164 kfree_skb(skb);
165 }
166 ida_destroy(&port->ida);
167 kfree(port);
168 }
169
170 #define IPVLAN_FEATURES \
171 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
172 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
173 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
174 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
175
176 #define IPVLAN_STATE_MASK \
177 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
178
179 static int ipvlan_init(struct net_device *dev)
180 {
181 struct ipvl_dev *ipvlan = netdev_priv(dev);
182 const struct net_device *phy_dev = ipvlan->phy_dev;
183 struct ipvl_port *port = ipvlan->port;
184
185 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
186 (phy_dev->state & IPVLAN_STATE_MASK);
187 dev->features = phy_dev->features & IPVLAN_FEATURES;
188 dev->features |= NETIF_F_LLTX;
189 dev->gso_max_size = phy_dev->gso_max_size;
190 dev->gso_max_segs = phy_dev->gso_max_segs;
191 dev->hard_header_len = phy_dev->hard_header_len;
192
193 netdev_lockdep_set_classes(dev);
194
195 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats);
196 if (!ipvlan->pcpu_stats)
197 return -ENOMEM;
198
199 port->count += 1;
200
201 return 0;
202 }
203
204 static void ipvlan_uninit(struct net_device *dev)
205 {
206 struct ipvl_dev *ipvlan = netdev_priv(dev);
207 struct ipvl_port *port = ipvlan->port;
208
209 free_percpu(ipvlan->pcpu_stats);
210
211 port->count -= 1;
212 if (!port->count)
213 ipvlan_port_destroy(port->dev);
214 }
215
216 static int ipvlan_open(struct net_device *dev)
217 {
218 struct ipvl_dev *ipvlan = netdev_priv(dev);
219 struct net_device *phy_dev = ipvlan->phy_dev;
220 struct ipvl_addr *addr;
221
222 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
223 ipvlan->port->mode == IPVLAN_MODE_L3S)
224 dev->flags |= IFF_NOARP;
225 else
226 dev->flags &= ~IFF_NOARP;
227
228 list_for_each_entry(addr, &ipvlan->addrs, anode)
229 ipvlan_ht_addr_add(ipvlan, addr);
230
231 return dev_uc_add(phy_dev, phy_dev->dev_addr);
232 }
233
234 static int ipvlan_stop(struct net_device *dev)
235 {
236 struct ipvl_dev *ipvlan = netdev_priv(dev);
237 struct net_device *phy_dev = ipvlan->phy_dev;
238 struct ipvl_addr *addr;
239
240 dev_uc_unsync(phy_dev, dev);
241 dev_mc_unsync(phy_dev, dev);
242
243 dev_uc_del(phy_dev, phy_dev->dev_addr);
244
245 list_for_each_entry(addr, &ipvlan->addrs, anode)
246 ipvlan_ht_addr_del(addr);
247
248 return 0;
249 }
250
251 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
252 struct net_device *dev)
253 {
254 const struct ipvl_dev *ipvlan = netdev_priv(dev);
255 int skblen = skb->len;
256 int ret;
257
258 ret = ipvlan_queue_xmit(skb, dev);
259 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
260 struct ipvl_pcpu_stats *pcptr;
261
262 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
263
264 u64_stats_update_begin(&pcptr->syncp);
265 pcptr->tx_pkts++;
266 pcptr->tx_bytes += skblen;
267 u64_stats_update_end(&pcptr->syncp);
268 } else {
269 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
270 }
271 return ret;
272 }
273
274 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
275 netdev_features_t features)
276 {
277 struct ipvl_dev *ipvlan = netdev_priv(dev);
278
279 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
280 }
281
282 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
283 {
284 struct ipvl_dev *ipvlan = netdev_priv(dev);
285 struct net_device *phy_dev = ipvlan->phy_dev;
286
287 if (change & IFF_ALLMULTI)
288 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
289 }
290
291 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
292 {
293 struct ipvl_dev *ipvlan = netdev_priv(dev);
294
295 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
296 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
297 } else {
298 struct netdev_hw_addr *ha;
299 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
300
301 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
302 netdev_for_each_mc_addr(ha, dev)
303 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
304
305 /* Turn-on broadcast bit irrespective of address family,
306 * since broadcast is deferred to a work-queue, hence no
307 * impact on fast-path processing.
308 */
309 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
310
311 bitmap_copy(ipvlan->mac_filters, mc_filters,
312 IPVLAN_MAC_FILTER_SIZE);
313 }
314 dev_uc_sync(ipvlan->phy_dev, dev);
315 dev_mc_sync(ipvlan->phy_dev, dev);
316 }
317
318 static void ipvlan_get_stats64(struct net_device *dev,
319 struct rtnl_link_stats64 *s)
320 {
321 struct ipvl_dev *ipvlan = netdev_priv(dev);
322
323 if (ipvlan->pcpu_stats) {
324 struct ipvl_pcpu_stats *pcptr;
325 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
326 u32 rx_errs = 0, tx_drps = 0;
327 u32 strt;
328 int idx;
329
330 for_each_possible_cpu(idx) {
331 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
332 do {
333 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
334 rx_pkts = pcptr->rx_pkts;
335 rx_bytes = pcptr->rx_bytes;
336 rx_mcast = pcptr->rx_mcast;
337 tx_pkts = pcptr->tx_pkts;
338 tx_bytes = pcptr->tx_bytes;
339 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
340 strt));
341
342 s->rx_packets += rx_pkts;
343 s->rx_bytes += rx_bytes;
344 s->multicast += rx_mcast;
345 s->tx_packets += tx_pkts;
346 s->tx_bytes += tx_bytes;
347
348 /* u32 values are updated without syncp protection. */
349 rx_errs += pcptr->rx_errs;
350 tx_drps += pcptr->tx_drps;
351 }
352 s->rx_errors = rx_errs;
353 s->rx_dropped = rx_errs;
354 s->tx_dropped = tx_drps;
355 }
356 }
357
358 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
359 {
360 struct ipvl_dev *ipvlan = netdev_priv(dev);
361 struct net_device *phy_dev = ipvlan->phy_dev;
362
363 return vlan_vid_add(phy_dev, proto, vid);
364 }
365
366 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
367 u16 vid)
368 {
369 struct ipvl_dev *ipvlan = netdev_priv(dev);
370 struct net_device *phy_dev = ipvlan->phy_dev;
371
372 vlan_vid_del(phy_dev, proto, vid);
373 return 0;
374 }
375
376 static int ipvlan_get_iflink(const struct net_device *dev)
377 {
378 struct ipvl_dev *ipvlan = netdev_priv(dev);
379
380 return ipvlan->phy_dev->ifindex;
381 }
382
383 static const struct net_device_ops ipvlan_netdev_ops = {
384 .ndo_init = ipvlan_init,
385 .ndo_uninit = ipvlan_uninit,
386 .ndo_open = ipvlan_open,
387 .ndo_stop = ipvlan_stop,
388 .ndo_start_xmit = ipvlan_start_xmit,
389 .ndo_fix_features = ipvlan_fix_features,
390 .ndo_change_rx_flags = ipvlan_change_rx_flags,
391 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
392 .ndo_get_stats64 = ipvlan_get_stats64,
393 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
394 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
395 .ndo_get_iflink = ipvlan_get_iflink,
396 };
397
398 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
399 unsigned short type, const void *daddr,
400 const void *saddr, unsigned len)
401 {
402 const struct ipvl_dev *ipvlan = netdev_priv(dev);
403 struct net_device *phy_dev = ipvlan->phy_dev;
404
405 /* TODO Probably use a different field than dev_addr so that the
406 * mac-address on the virtual device is portable and can be carried
407 * while the packets use the mac-addr on the physical device.
408 */
409 return dev_hard_header(skb, phy_dev, type, daddr,
410 saddr ? : dev->dev_addr, len);
411 }
412
413 static const struct header_ops ipvlan_header_ops = {
414 .create = ipvlan_hard_header,
415 .parse = eth_header_parse,
416 .cache = eth_header_cache,
417 .cache_update = eth_header_cache_update,
418 };
419
420 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
421 struct ethtool_link_ksettings *cmd)
422 {
423 const struct ipvl_dev *ipvlan = netdev_priv(dev);
424
425 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
426 }
427
428 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
429 struct ethtool_drvinfo *drvinfo)
430 {
431 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
432 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
433 }
434
435 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
436 {
437 const struct ipvl_dev *ipvlan = netdev_priv(dev);
438
439 return ipvlan->msg_enable;
440 }
441
442 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
443 {
444 struct ipvl_dev *ipvlan = netdev_priv(dev);
445
446 ipvlan->msg_enable = value;
447 }
448
449 static const struct ethtool_ops ipvlan_ethtool_ops = {
450 .get_link = ethtool_op_get_link,
451 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
452 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
453 .get_msglevel = ipvlan_ethtool_get_msglevel,
454 .set_msglevel = ipvlan_ethtool_set_msglevel,
455 };
456
457 static int ipvlan_nl_changelink(struct net_device *dev,
458 struct nlattr *tb[], struct nlattr *data[],
459 struct netlink_ext_ack *extack)
460 {
461 struct ipvl_dev *ipvlan = netdev_priv(dev);
462 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
463 int err = 0;
464
465 if (data && data[IFLA_IPVLAN_MODE]) {
466 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
467
468 err = ipvlan_set_port_mode(port, nmode);
469 }
470 return err;
471 }
472
473 static size_t ipvlan_nl_getsize(const struct net_device *dev)
474 {
475 return (0
476 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
477 );
478 }
479
480 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
481 struct netlink_ext_ack *extack)
482 {
483 if (data && data[IFLA_IPVLAN_MODE]) {
484 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
485
486 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
487 return -EINVAL;
488 }
489 return 0;
490 }
491
492 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
493 const struct net_device *dev)
494 {
495 struct ipvl_dev *ipvlan = netdev_priv(dev);
496 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
497 int ret = -EINVAL;
498
499 if (!port)
500 goto err;
501
502 ret = -EMSGSIZE;
503 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
504 goto err;
505
506 return 0;
507
508 err:
509 return ret;
510 }
511
512 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
513 struct nlattr *tb[], struct nlattr *data[],
514 struct netlink_ext_ack *extack)
515 {
516 struct ipvl_dev *ipvlan = netdev_priv(dev);
517 struct ipvl_port *port;
518 struct net_device *phy_dev;
519 int err;
520 u16 mode = IPVLAN_MODE_L3;
521 bool create = false;
522
523 if (!tb[IFLA_LINK])
524 return -EINVAL;
525
526 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
527 if (!phy_dev)
528 return -ENODEV;
529
530 if (netif_is_ipvlan(phy_dev)) {
531 struct ipvl_dev *tmp = netdev_priv(phy_dev);
532
533 phy_dev = tmp->phy_dev;
534 } else if (!netif_is_ipvlan_port(phy_dev)) {
535 err = ipvlan_port_create(phy_dev);
536 if (err < 0)
537 return err;
538 create = true;
539 }
540
541 if (data && data[IFLA_IPVLAN_MODE])
542 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
543
544 port = ipvlan_port_get_rtnl(phy_dev);
545 ipvlan->phy_dev = phy_dev;
546 ipvlan->dev = dev;
547 ipvlan->port = port;
548 ipvlan->sfeatures = IPVLAN_FEATURES;
549 ipvlan_adjust_mtu(ipvlan, phy_dev);
550 INIT_LIST_HEAD(&ipvlan->addrs);
551
552 /* If the port-id base is at the MAX value, then wrap it around and
553 * begin from 0x1 again. This may be due to a busy system where lots
554 * of slaves are getting created and deleted.
555 */
556 if (port->dev_id_start == 0xFFFE)
557 port->dev_id_start = 0x1;
558
559 /* Since L2 address is shared among all IPvlan slaves including
560 * master, use unique 16 bit dev-ids to diffentiate among them.
561 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
562 * slave link [see addrconf_ifid_eui48()].
563 */
564 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
565 GFP_KERNEL);
566 if (err < 0)
567 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
568 GFP_KERNEL);
569 if (err < 0)
570 goto destroy_ipvlan_port;
571 dev->dev_id = err;
572 /* Increment id-base to the next slot for the future assignment */
573 port->dev_id_start = err + 1;
574
575 /* TODO Probably put random address here to be presented to the
576 * world but keep using the physical-dev address for the outgoing
577 * packets.
578 */
579 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
580
581 dev->priv_flags |= IFF_IPVLAN_SLAVE;
582
583 err = register_netdevice(dev);
584 if (err < 0)
585 goto remove_ida;
586
587 err = netdev_upper_dev_link(phy_dev, dev);
588 if (err) {
589 goto unregister_netdev;
590 }
591 err = ipvlan_set_port_mode(port, mode);
592 if (err) {
593 goto unlink_netdev;
594 }
595
596 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
597 netif_stacked_transfer_operstate(phy_dev, dev);
598 return 0;
599
600 unlink_netdev:
601 netdev_upper_dev_unlink(phy_dev, dev);
602 unregister_netdev:
603 unregister_netdevice(dev);
604 remove_ida:
605 ida_simple_remove(&port->ida, dev->dev_id);
606 destroy_ipvlan_port:
607 if (create)
608 ipvlan_port_destroy(phy_dev);
609 return err;
610 }
611 EXPORT_SYMBOL_GPL(ipvlan_link_new);
612
613 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
614 {
615 struct ipvl_dev *ipvlan = netdev_priv(dev);
616 struct ipvl_addr *addr, *next;
617
618 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
619 ipvlan_ht_addr_del(addr);
620 list_del(&addr->anode);
621 kfree_rcu(addr, rcu);
622 }
623
624 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
625 list_del_rcu(&ipvlan->pnode);
626 unregister_netdevice_queue(dev, head);
627 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
628 }
629 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
630
631 void ipvlan_link_setup(struct net_device *dev)
632 {
633 ether_setup(dev);
634
635 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
636 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
637 dev->netdev_ops = &ipvlan_netdev_ops;
638 dev->needs_free_netdev = true;
639 dev->header_ops = &ipvlan_header_ops;
640 dev->ethtool_ops = &ipvlan_ethtool_ops;
641 }
642 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
643
644 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
645 {
646 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
647 };
648
649 static struct rtnl_link_ops ipvlan_link_ops = {
650 .kind = "ipvlan",
651 .priv_size = sizeof(struct ipvl_dev),
652
653 .setup = ipvlan_link_setup,
654 .newlink = ipvlan_link_new,
655 .dellink = ipvlan_link_delete,
656 };
657
658 int ipvlan_link_register(struct rtnl_link_ops *ops)
659 {
660 ops->get_size = ipvlan_nl_getsize;
661 ops->policy = ipvlan_nl_policy;
662 ops->validate = ipvlan_nl_validate;
663 ops->fill_info = ipvlan_nl_fillinfo;
664 ops->changelink = ipvlan_nl_changelink;
665 ops->maxtype = IFLA_IPVLAN_MAX;
666 return rtnl_link_register(ops);
667 }
668 EXPORT_SYMBOL_GPL(ipvlan_link_register);
669
670 static int ipvlan_device_event(struct notifier_block *unused,
671 unsigned long event, void *ptr)
672 {
673 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
674 struct ipvl_dev *ipvlan, *next;
675 struct ipvl_port *port;
676 LIST_HEAD(lst_kill);
677
678 if (!netif_is_ipvlan_port(dev))
679 return NOTIFY_DONE;
680
681 port = ipvlan_port_get_rtnl(dev);
682
683 switch (event) {
684 case NETDEV_CHANGE:
685 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
686 netif_stacked_transfer_operstate(ipvlan->phy_dev,
687 ipvlan->dev);
688 break;
689
690 case NETDEV_REGISTER: {
691 struct net *oldnet, *newnet = dev_net(dev);
692 struct ipvlan_netns *old_vnet;
693
694 oldnet = read_pnet(&port->pnet);
695 if (net_eq(newnet, oldnet))
696 break;
697
698 write_pnet(&port->pnet, newnet);
699
700 old_vnet = net_generic(oldnet, ipvlan_netid);
701 if (!old_vnet->ipvl_nf_hook_refcnt)
702 break;
703
704 ipvlan_register_nf_hook(newnet);
705 ipvlan_unregister_nf_hook(oldnet);
706 break;
707 }
708 case NETDEV_UNREGISTER:
709 if (dev->reg_state != NETREG_UNREGISTERING)
710 break;
711
712 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
713 pnode)
714 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
715 &lst_kill);
716 unregister_netdevice_many(&lst_kill);
717 break;
718
719 case NETDEV_FEAT_CHANGE:
720 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
721 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
722 ipvlan->dev->gso_max_size = dev->gso_max_size;
723 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
724 netdev_features_change(ipvlan->dev);
725 }
726 break;
727
728 case NETDEV_CHANGEMTU:
729 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
730 ipvlan_adjust_mtu(ipvlan, dev);
731 break;
732
733 case NETDEV_PRE_TYPE_CHANGE:
734 /* Forbid underlying device to change its type. */
735 return NOTIFY_BAD;
736 }
737 return NOTIFY_DONE;
738 }
739
740 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
741 {
742 struct ipvl_addr *addr;
743
744 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
745 if (!addr)
746 return -ENOMEM;
747
748 addr->master = ipvlan;
749 if (is_v6) {
750 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
751 addr->atype = IPVL_IPV6;
752 } else {
753 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
754 addr->atype = IPVL_IPV4;
755 }
756 list_add_tail(&addr->anode, &ipvlan->addrs);
757
758 /* If the interface is not up, the address will be added to the hash
759 * list by ipvlan_open.
760 */
761 if (netif_running(ipvlan->dev))
762 ipvlan_ht_addr_add(ipvlan, addr);
763
764 return 0;
765 }
766
767 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
768 {
769 struct ipvl_addr *addr;
770
771 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
772 if (!addr)
773 return;
774
775 ipvlan_ht_addr_del(addr);
776 list_del(&addr->anode);
777 kfree_rcu(addr, rcu);
778
779 return;
780 }
781
782 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
783 {
784 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
785 netif_err(ipvlan, ifup, ipvlan->dev,
786 "Failed to add IPv6=%pI6c addr for %s intf\n",
787 ip6_addr, ipvlan->dev->name);
788 return -EINVAL;
789 }
790
791 return ipvlan_add_addr(ipvlan, ip6_addr, true);
792 }
793
794 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
795 {
796 return ipvlan_del_addr(ipvlan, ip6_addr, true);
797 }
798
799 static int ipvlan_addr6_event(struct notifier_block *unused,
800 unsigned long event, void *ptr)
801 {
802 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
803 struct net_device *dev = (struct net_device *)if6->idev->dev;
804 struct ipvl_dev *ipvlan = netdev_priv(dev);
805
806 /* FIXME IPv6 autoconf calls us from bh without RTNL */
807 if (in_softirq())
808 return NOTIFY_DONE;
809
810 if (!netif_is_ipvlan(dev))
811 return NOTIFY_DONE;
812
813 if (!ipvlan || !ipvlan->port)
814 return NOTIFY_DONE;
815
816 switch (event) {
817 case NETDEV_UP:
818 if (ipvlan_add_addr6(ipvlan, &if6->addr))
819 return NOTIFY_BAD;
820 break;
821
822 case NETDEV_DOWN:
823 ipvlan_del_addr6(ipvlan, &if6->addr);
824 break;
825 }
826
827 return NOTIFY_OK;
828 }
829
830 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
831 unsigned long event, void *ptr)
832 {
833 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
834 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
835 struct ipvl_dev *ipvlan = netdev_priv(dev);
836
837 /* FIXME IPv6 autoconf calls us from bh without RTNL */
838 if (in_softirq())
839 return NOTIFY_DONE;
840
841 if (!netif_is_ipvlan(dev))
842 return NOTIFY_DONE;
843
844 if (!ipvlan || !ipvlan->port)
845 return NOTIFY_DONE;
846
847 switch (event) {
848 case NETDEV_UP:
849 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true))
850 return notifier_from_errno(-EADDRINUSE);
851 break;
852 }
853
854 return NOTIFY_OK;
855 }
856
857 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
858 {
859 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
860 netif_err(ipvlan, ifup, ipvlan->dev,
861 "Failed to add IPv4=%pI4 on %s intf.\n",
862 ip4_addr, ipvlan->dev->name);
863 return -EINVAL;
864 }
865
866 return ipvlan_add_addr(ipvlan, ip4_addr, false);
867 }
868
869 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
870 {
871 return ipvlan_del_addr(ipvlan, ip4_addr, false);
872 }
873
874 static int ipvlan_addr4_event(struct notifier_block *unused,
875 unsigned long event, void *ptr)
876 {
877 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
878 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
879 struct ipvl_dev *ipvlan = netdev_priv(dev);
880 struct in_addr ip4_addr;
881
882 if (!netif_is_ipvlan(dev))
883 return NOTIFY_DONE;
884
885 if (!ipvlan || !ipvlan->port)
886 return NOTIFY_DONE;
887
888 switch (event) {
889 case NETDEV_UP:
890 ip4_addr.s_addr = if4->ifa_address;
891 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
892 return NOTIFY_BAD;
893 break;
894
895 case NETDEV_DOWN:
896 ip4_addr.s_addr = if4->ifa_address;
897 ipvlan_del_addr4(ipvlan, &ip4_addr);
898 break;
899 }
900
901 return NOTIFY_OK;
902 }
903
904 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
905 unsigned long event, void *ptr)
906 {
907 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
908 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
909 struct ipvl_dev *ipvlan = netdev_priv(dev);
910
911 if (!netif_is_ipvlan(dev))
912 return NOTIFY_DONE;
913
914 if (!ipvlan || !ipvlan->port)
915 return NOTIFY_DONE;
916
917 switch (event) {
918 case NETDEV_UP:
919 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false))
920 return notifier_from_errno(-EADDRINUSE);
921 break;
922 }
923
924 return NOTIFY_OK;
925 }
926
927 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
928 .notifier_call = ipvlan_addr4_event,
929 };
930
931 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
932 .notifier_call = ipvlan_addr4_validator_event,
933 };
934
935 static struct notifier_block ipvlan_notifier_block __read_mostly = {
936 .notifier_call = ipvlan_device_event,
937 };
938
939 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
940 .notifier_call = ipvlan_addr6_event,
941 };
942
943 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
944 .notifier_call = ipvlan_addr6_validator_event,
945 };
946
947 static void ipvlan_ns_exit(struct net *net)
948 {
949 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
950
951 if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
952 vnet->ipvl_nf_hook_refcnt = 0;
953 nf_unregister_net_hooks(net, ipvl_nfops,
954 ARRAY_SIZE(ipvl_nfops));
955 }
956 }
957
958 static struct pernet_operations ipvlan_net_ops = {
959 .id = &ipvlan_netid,
960 .size = sizeof(struct ipvlan_netns),
961 .exit = ipvlan_ns_exit,
962 };
963
964 static int __init ipvlan_init_module(void)
965 {
966 int err;
967
968 ipvlan_init_secret();
969 register_netdevice_notifier(&ipvlan_notifier_block);
970 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
971 register_inet6addr_validator_notifier(
972 &ipvlan_addr6_vtor_notifier_block);
973 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
974 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
975
976 err = register_pernet_subsys(&ipvlan_net_ops);
977 if (err < 0)
978 goto error;
979
980 err = ipvlan_link_register(&ipvlan_link_ops);
981 if (err < 0) {
982 unregister_pernet_subsys(&ipvlan_net_ops);
983 goto error;
984 }
985
986 return 0;
987 error:
988 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
989 unregister_inetaddr_validator_notifier(
990 &ipvlan_addr4_vtor_notifier_block);
991 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
992 unregister_inet6addr_validator_notifier(
993 &ipvlan_addr6_vtor_notifier_block);
994 unregister_netdevice_notifier(&ipvlan_notifier_block);
995 return err;
996 }
997
998 static void __exit ipvlan_cleanup_module(void)
999 {
1000 rtnl_link_unregister(&ipvlan_link_ops);
1001 unregister_pernet_subsys(&ipvlan_net_ops);
1002 unregister_netdevice_notifier(&ipvlan_notifier_block);
1003 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1004 unregister_inetaddr_validator_notifier(
1005 &ipvlan_addr4_vtor_notifier_block);
1006 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1007 unregister_inet6addr_validator_notifier(
1008 &ipvlan_addr6_vtor_notifier_block);
1009 }
1010
1011 module_init(ipvlan_init_module);
1012 module_exit(ipvlan_cleanup_module);
1013
1014 MODULE_LICENSE("GPL");
1015 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1016 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1017 MODULE_ALIAS_RTNL_LINK("ipvlan");
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