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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
3 */
4
5#include <linux/ethtool.h>
6
7#include "ipvlan.h"
8
9static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
10 struct netlink_ext_ack *extack)
11{
12 struct ipvl_dev *ipvlan;
13 unsigned int flags;
14 int err;
15
16 ASSERT_RTNL();
17 if (port->mode != nval) {
18 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
19 flags = ipvlan->dev->flags;
20 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
21 err = dev_change_flags(ipvlan->dev,
22 flags | IFF_NOARP,
23 extack);
24 } else {
25 err = dev_change_flags(ipvlan->dev,
26 flags & ~IFF_NOARP,
27 extack);
28 }
29 if (unlikely(err))
30 goto fail;
31 }
32 if (nval == IPVLAN_MODE_L3S) {
33 /* New mode is L3S */
34 err = ipvlan_l3s_register(port);
35 if (err)
36 goto fail;
37 } else if (port->mode == IPVLAN_MODE_L3S) {
38 /* Old mode was L3S */
39 ipvlan_l3s_unregister(port);
40 }
41 port->mode = nval;
42 }
43 return 0;
44
45fail:
46 /* Undo the flags changes that have been done so far. */
47 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
48 flags = ipvlan->dev->flags;
49 if (port->mode == IPVLAN_MODE_L3 ||
50 port->mode == IPVLAN_MODE_L3S)
51 dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
52 NULL);
53 else
54 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
55 NULL);
56 }
57
58 return err;
59}
60
61static int ipvlan_port_create(struct net_device *dev)
62{
63 struct ipvl_port *port;
64 int err, idx;
65
66 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
67 if (!port)
68 return -ENOMEM;
69
70 write_pnet(&port->pnet, dev_net(dev));
71 port->dev = dev;
72 port->mode = IPVLAN_MODE_L3;
73 INIT_LIST_HEAD(&port->ipvlans);
74 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
75 INIT_HLIST_HEAD(&port->hlhead[idx]);
76
77 skb_queue_head_init(&port->backlog);
78 INIT_WORK(&port->wq, ipvlan_process_multicast);
79 ida_init(&port->ida);
80 port->dev_id_start = 1;
81
82 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
83 if (err)
84 goto err;
85
86 netdev_hold(dev, &port->dev_tracker, GFP_KERNEL);
87 return 0;
88
89err:
90 kfree(port);
91 return err;
92}
93
94static void ipvlan_port_destroy(struct net_device *dev)
95{
96 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
97 struct sk_buff *skb;
98
99 netdev_put(dev, &port->dev_tracker);
100 if (port->mode == IPVLAN_MODE_L3S)
101 ipvlan_l3s_unregister(port);
102 netdev_rx_handler_unregister(dev);
103 cancel_work_sync(&port->wq);
104 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
105 dev_put(skb->dev);
106 kfree_skb(skb);
107 }
108 ida_destroy(&port->ida);
109 kfree(port);
110}
111
112#define IPVLAN_ALWAYS_ON_OFLOADS \
113 (NETIF_F_SG | NETIF_F_HW_CSUM | \
114 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
115
116#define IPVLAN_ALWAYS_ON \
117 (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_VLAN_CHALLENGED)
118
119#define IPVLAN_FEATURES \
120 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
121 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
122 NETIF_F_GRO | NETIF_F_RXCSUM | \
123 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
124
125 /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
126
127#define IPVLAN_STATE_MASK \
128 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
129
130static int ipvlan_init(struct net_device *dev)
131{
132 struct ipvl_dev *ipvlan = netdev_priv(dev);
133 struct net_device *phy_dev = ipvlan->phy_dev;
134 struct ipvl_port *port;
135 int err;
136
137 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
138 (phy_dev->state & IPVLAN_STATE_MASK);
139 dev->features = phy_dev->features & IPVLAN_FEATURES;
140 dev->features |= IPVLAN_ALWAYS_ON;
141 dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
142 dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
143 dev->hw_enc_features |= dev->features;
144 dev->lltx = true;
145 netif_inherit_tso_max(dev, phy_dev);
146 dev->hard_header_len = phy_dev->hard_header_len;
147
148 netdev_lockdep_set_classes(dev);
149
150 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
151 if (!ipvlan->pcpu_stats)
152 return -ENOMEM;
153
154 if (!netif_is_ipvlan_port(phy_dev)) {
155 err = ipvlan_port_create(phy_dev);
156 if (err < 0) {
157 free_percpu(ipvlan->pcpu_stats);
158 return err;
159 }
160 }
161 port = ipvlan_port_get_rtnl(phy_dev);
162 port->count += 1;
163 return 0;
164}
165
166static void ipvlan_uninit(struct net_device *dev)
167{
168 struct ipvl_dev *ipvlan = netdev_priv(dev);
169 struct net_device *phy_dev = ipvlan->phy_dev;
170 struct ipvl_port *port;
171
172 free_percpu(ipvlan->pcpu_stats);
173
174 port = ipvlan_port_get_rtnl(phy_dev);
175 port->count -= 1;
176 if (!port->count)
177 ipvlan_port_destroy(port->dev);
178}
179
180static int ipvlan_open(struct net_device *dev)
181{
182 struct ipvl_dev *ipvlan = netdev_priv(dev);
183 struct ipvl_addr *addr;
184
185 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
186 ipvlan->port->mode == IPVLAN_MODE_L3S)
187 dev->flags |= IFF_NOARP;
188 else
189 dev->flags &= ~IFF_NOARP;
190
191 rcu_read_lock();
192 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
193 ipvlan_ht_addr_add(ipvlan, addr);
194 rcu_read_unlock();
195
196 return 0;
197}
198
199static int ipvlan_stop(struct net_device *dev)
200{
201 struct ipvl_dev *ipvlan = netdev_priv(dev);
202 struct net_device *phy_dev = ipvlan->phy_dev;
203 struct ipvl_addr *addr;
204
205 dev_uc_unsync(phy_dev, dev);
206 dev_mc_unsync(phy_dev, dev);
207
208 rcu_read_lock();
209 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
210 ipvlan_ht_addr_del(addr);
211 rcu_read_unlock();
212
213 return 0;
214}
215
216static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
217 struct net_device *dev)
218{
219 const struct ipvl_dev *ipvlan = netdev_priv(dev);
220 int skblen = skb->len;
221 int ret;
222
223 ret = ipvlan_queue_xmit(skb, dev);
224 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
225 struct ipvl_pcpu_stats *pcptr;
226
227 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
228
229 u64_stats_update_begin(&pcptr->syncp);
230 u64_stats_inc(&pcptr->tx_pkts);
231 u64_stats_add(&pcptr->tx_bytes, skblen);
232 u64_stats_update_end(&pcptr->syncp);
233 } else {
234 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
235 }
236 return ret;
237}
238
239static netdev_features_t ipvlan_fix_features(struct net_device *dev,
240 netdev_features_t features)
241{
242 struct ipvl_dev *ipvlan = netdev_priv(dev);
243
244 features |= NETIF_F_ALL_FOR_ALL;
245 features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES);
246 features = netdev_increment_features(ipvlan->phy_dev->features,
247 features, features);
248 features |= IPVLAN_ALWAYS_ON;
249 features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON);
250
251 return features;
252}
253
254static void ipvlan_change_rx_flags(struct net_device *dev, int change)
255{
256 struct ipvl_dev *ipvlan = netdev_priv(dev);
257 struct net_device *phy_dev = ipvlan->phy_dev;
258
259 if (change & IFF_ALLMULTI)
260 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
261}
262
263static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
264{
265 struct ipvl_dev *ipvlan = netdev_priv(dev);
266
267 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
268 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
269 } else {
270 struct netdev_hw_addr *ha;
271 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
272
273 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
274 netdev_for_each_mc_addr(ha, dev)
275 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
276
277 /* Turn-on broadcast bit irrespective of address family,
278 * since broadcast is deferred to a work-queue, hence no
279 * impact on fast-path processing.
280 */
281 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
282
283 bitmap_copy(ipvlan->mac_filters, mc_filters,
284 IPVLAN_MAC_FILTER_SIZE);
285 }
286 dev_uc_sync(ipvlan->phy_dev, dev);
287 dev_mc_sync(ipvlan->phy_dev, dev);
288}
289
290static void ipvlan_get_stats64(struct net_device *dev,
291 struct rtnl_link_stats64 *s)
292{
293 struct ipvl_dev *ipvlan = netdev_priv(dev);
294
295 if (ipvlan->pcpu_stats) {
296 struct ipvl_pcpu_stats *pcptr;
297 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
298 u32 rx_errs = 0, tx_drps = 0;
299 u32 strt;
300 int idx;
301
302 for_each_possible_cpu(idx) {
303 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
304 do {
305 strt = u64_stats_fetch_begin(&pcptr->syncp);
306 rx_pkts = u64_stats_read(&pcptr->rx_pkts);
307 rx_bytes = u64_stats_read(&pcptr->rx_bytes);
308 rx_mcast = u64_stats_read(&pcptr->rx_mcast);
309 tx_pkts = u64_stats_read(&pcptr->tx_pkts);
310 tx_bytes = u64_stats_read(&pcptr->tx_bytes);
311 } while (u64_stats_fetch_retry(&pcptr->syncp,
312 strt));
313
314 s->rx_packets += rx_pkts;
315 s->rx_bytes += rx_bytes;
316 s->multicast += rx_mcast;
317 s->tx_packets += tx_pkts;
318 s->tx_bytes += tx_bytes;
319
320 /* u32 values are updated without syncp protection. */
321 rx_errs += READ_ONCE(pcptr->rx_errs);
322 tx_drps += READ_ONCE(pcptr->tx_drps);
323 }
324 s->rx_errors = rx_errs;
325 s->rx_dropped = rx_errs;
326 s->tx_dropped = tx_drps;
327 }
328 s->tx_errors = DEV_STATS_READ(dev, tx_errors);
329}
330
331static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
332{
333 struct ipvl_dev *ipvlan = netdev_priv(dev);
334 struct net_device *phy_dev = ipvlan->phy_dev;
335
336 return vlan_vid_add(phy_dev, proto, vid);
337}
338
339static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
340 u16 vid)
341{
342 struct ipvl_dev *ipvlan = netdev_priv(dev);
343 struct net_device *phy_dev = ipvlan->phy_dev;
344
345 vlan_vid_del(phy_dev, proto, vid);
346 return 0;
347}
348
349static int ipvlan_get_iflink(const struct net_device *dev)
350{
351 struct ipvl_dev *ipvlan = netdev_priv(dev);
352
353 return READ_ONCE(ipvlan->phy_dev->ifindex);
354}
355
356static const struct net_device_ops ipvlan_netdev_ops = {
357 .ndo_init = ipvlan_init,
358 .ndo_uninit = ipvlan_uninit,
359 .ndo_open = ipvlan_open,
360 .ndo_stop = ipvlan_stop,
361 .ndo_start_xmit = ipvlan_start_xmit,
362 .ndo_fix_features = ipvlan_fix_features,
363 .ndo_change_rx_flags = ipvlan_change_rx_flags,
364 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
365 .ndo_get_stats64 = ipvlan_get_stats64,
366 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
367 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
368 .ndo_get_iflink = ipvlan_get_iflink,
369};
370
371static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
372 unsigned short type, const void *daddr,
373 const void *saddr, unsigned len)
374{
375 const struct ipvl_dev *ipvlan = netdev_priv(dev);
376 struct net_device *phy_dev = ipvlan->phy_dev;
377
378 /* TODO Probably use a different field than dev_addr so that the
379 * mac-address on the virtual device is portable and can be carried
380 * while the packets use the mac-addr on the physical device.
381 */
382 return dev_hard_header(skb, phy_dev, type, daddr,
383 saddr ? : phy_dev->dev_addr, len);
384}
385
386static const struct header_ops ipvlan_header_ops = {
387 .create = ipvlan_hard_header,
388 .parse = eth_header_parse,
389 .cache = eth_header_cache,
390 .cache_update = eth_header_cache_update,
391 .parse_protocol = eth_header_parse_protocol,
392};
393
394static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
395{
396 ipvlan->dev->mtu = dev->mtu;
397}
398
399static bool netif_is_ipvlan(const struct net_device *dev)
400{
401 /* both ipvlan and ipvtap devices use the same netdev_ops */
402 return dev->netdev_ops == &ipvlan_netdev_ops;
403}
404
405static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
406 struct ethtool_link_ksettings *cmd)
407{
408 const struct ipvl_dev *ipvlan = netdev_priv(dev);
409
410 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
411}
412
413static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
414 struct ethtool_drvinfo *drvinfo)
415{
416 strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
417 strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
418}
419
420static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
421{
422 const struct ipvl_dev *ipvlan = netdev_priv(dev);
423
424 return ipvlan->msg_enable;
425}
426
427static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
428{
429 struct ipvl_dev *ipvlan = netdev_priv(dev);
430
431 ipvlan->msg_enable = value;
432}
433
434static const struct ethtool_ops ipvlan_ethtool_ops = {
435 .get_link = ethtool_op_get_link,
436 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
437 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
438 .get_msglevel = ipvlan_ethtool_get_msglevel,
439 .set_msglevel = ipvlan_ethtool_set_msglevel,
440};
441
442static int ipvlan_nl_changelink(struct net_device *dev,
443 struct nlattr *tb[], struct nlattr *data[],
444 struct netlink_ext_ack *extack)
445{
446 struct ipvl_dev *ipvlan = netdev_priv(dev);
447 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
448 int err = 0;
449
450 if (!data)
451 return 0;
452 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
453 return -EPERM;
454
455 if (data[IFLA_IPVLAN_MODE]) {
456 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
457
458 err = ipvlan_set_port_mode(port, nmode, extack);
459 }
460
461 if (!err && data[IFLA_IPVLAN_FLAGS]) {
462 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
463
464 if (flags & IPVLAN_F_PRIVATE)
465 ipvlan_mark_private(port);
466 else
467 ipvlan_clear_private(port);
468
469 if (flags & IPVLAN_F_VEPA)
470 ipvlan_mark_vepa(port);
471 else
472 ipvlan_clear_vepa(port);
473 }
474
475 return err;
476}
477
478static size_t ipvlan_nl_getsize(const struct net_device *dev)
479{
480 return (0
481 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
482 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
483 );
484}
485
486static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
487 struct netlink_ext_ack *extack)
488{
489 if (!data)
490 return 0;
491
492 if (data[IFLA_IPVLAN_MODE]) {
493 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
494
495 if (mode >= IPVLAN_MODE_MAX)
496 return -EINVAL;
497 }
498 if (data[IFLA_IPVLAN_FLAGS]) {
499 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
500
501 /* Only two bits are used at this moment. */
502 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
503 return -EINVAL;
504 /* Also both flags can't be active at the same time. */
505 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
506 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
507 return -EINVAL;
508 }
509
510 return 0;
511}
512
513static int ipvlan_nl_fillinfo(struct sk_buff *skb,
514 const struct net_device *dev)
515{
516 struct ipvl_dev *ipvlan = netdev_priv(dev);
517 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
518 int ret = -EINVAL;
519
520 if (!port)
521 goto err;
522
523 ret = -EMSGSIZE;
524 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
525 goto err;
526 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
527 goto err;
528
529 return 0;
530
531err:
532 return ret;
533}
534
535int ipvlan_link_new(struct net *src_net, struct net_device *dev,
536 struct nlattr *tb[], struct nlattr *data[],
537 struct netlink_ext_ack *extack)
538{
539 struct ipvl_dev *ipvlan = netdev_priv(dev);
540 struct ipvl_port *port;
541 struct net_device *phy_dev;
542 int err;
543 u16 mode = IPVLAN_MODE_L3;
544
545 if (!tb[IFLA_LINK])
546 return -EINVAL;
547
548 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
549 if (!phy_dev)
550 return -ENODEV;
551
552 if (netif_is_ipvlan(phy_dev)) {
553 struct ipvl_dev *tmp = netdev_priv(phy_dev);
554
555 phy_dev = tmp->phy_dev;
556 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
557 return -EPERM;
558 } else if (!netif_is_ipvlan_port(phy_dev)) {
559 /* Exit early if the underlying link is invalid or busy */
560 if (phy_dev->type != ARPHRD_ETHER ||
561 phy_dev->flags & IFF_LOOPBACK) {
562 netdev_err(phy_dev,
563 "Master is either lo or non-ether device\n");
564 return -EINVAL;
565 }
566
567 if (netdev_is_rx_handler_busy(phy_dev)) {
568 netdev_err(phy_dev, "Device is already in use.\n");
569 return -EBUSY;
570 }
571 }
572
573 ipvlan->phy_dev = phy_dev;
574 ipvlan->dev = dev;
575 ipvlan->sfeatures = IPVLAN_FEATURES;
576 if (!tb[IFLA_MTU])
577 ipvlan_adjust_mtu(ipvlan, phy_dev);
578 INIT_LIST_HEAD(&ipvlan->addrs);
579 spin_lock_init(&ipvlan->addrs_lock);
580
581 /* TODO Probably put random address here to be presented to the
582 * world but keep using the physical-dev address for the outgoing
583 * packets.
584 */
585 eth_hw_addr_set(dev, phy_dev->dev_addr);
586
587 dev->priv_flags |= IFF_NO_RX_HANDLER;
588
589 err = register_netdevice(dev);
590 if (err < 0)
591 return err;
592
593 /* ipvlan_init() would have created the port, if required */
594 port = ipvlan_port_get_rtnl(phy_dev);
595 ipvlan->port = port;
596
597 /* If the port-id base is at the MAX value, then wrap it around and
598 * begin from 0x1 again. This may be due to a busy system where lots
599 * of slaves are getting created and deleted.
600 */
601 if (port->dev_id_start == 0xFFFE)
602 port->dev_id_start = 0x1;
603
604 /* Since L2 address is shared among all IPvlan slaves including
605 * master, use unique 16 bit dev-ids to differentiate among them.
606 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
607 * slave link [see addrconf_ifid_eui48()].
608 */
609 err = ida_alloc_range(&port->ida, port->dev_id_start, 0xFFFD,
610 GFP_KERNEL);
611 if (err < 0)
612 err = ida_alloc_range(&port->ida, 0x1, port->dev_id_start - 1,
613 GFP_KERNEL);
614 if (err < 0)
615 goto unregister_netdev;
616 dev->dev_id = err;
617
618 /* Increment id-base to the next slot for the future assignment */
619 port->dev_id_start = err + 1;
620
621 err = netdev_upper_dev_link(phy_dev, dev, extack);
622 if (err)
623 goto remove_ida;
624
625 /* Flags are per port and latest update overrides. User has
626 * to be consistent in setting it just like the mode attribute.
627 */
628 if (data && data[IFLA_IPVLAN_FLAGS])
629 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
630
631 if (data && data[IFLA_IPVLAN_MODE])
632 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
633
634 err = ipvlan_set_port_mode(port, mode, extack);
635 if (err)
636 goto unlink_netdev;
637
638 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
639 netif_stacked_transfer_operstate(phy_dev, dev);
640 return 0;
641
642unlink_netdev:
643 netdev_upper_dev_unlink(phy_dev, dev);
644remove_ida:
645 ida_free(&port->ida, dev->dev_id);
646unregister_netdev:
647 unregister_netdevice(dev);
648 return err;
649}
650EXPORT_SYMBOL_GPL(ipvlan_link_new);
651
652void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
653{
654 struct ipvl_dev *ipvlan = netdev_priv(dev);
655 struct ipvl_addr *addr, *next;
656
657 spin_lock_bh(&ipvlan->addrs_lock);
658 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
659 ipvlan_ht_addr_del(addr);
660 list_del_rcu(&addr->anode);
661 kfree_rcu(addr, rcu);
662 }
663 spin_unlock_bh(&ipvlan->addrs_lock);
664
665 ida_free(&ipvlan->port->ida, dev->dev_id);
666 list_del_rcu(&ipvlan->pnode);
667 unregister_netdevice_queue(dev, head);
668 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
669}
670EXPORT_SYMBOL_GPL(ipvlan_link_delete);
671
672void ipvlan_link_setup(struct net_device *dev)
673{
674 ether_setup(dev);
675
676 dev->max_mtu = ETH_MAX_MTU;
677 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
678 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
679 dev->netdev_ops = &ipvlan_netdev_ops;
680 dev->needs_free_netdev = true;
681 dev->header_ops = &ipvlan_header_ops;
682 dev->ethtool_ops = &ipvlan_ethtool_ops;
683}
684EXPORT_SYMBOL_GPL(ipvlan_link_setup);
685
686static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
687{
688 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
689 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
690};
691
692static struct net *ipvlan_get_link_net(const struct net_device *dev)
693{
694 struct ipvl_dev *ipvlan = netdev_priv(dev);
695
696 return dev_net(ipvlan->phy_dev);
697}
698
699static struct rtnl_link_ops ipvlan_link_ops = {
700 .kind = "ipvlan",
701 .priv_size = sizeof(struct ipvl_dev),
702
703 .setup = ipvlan_link_setup,
704 .newlink = ipvlan_link_new,
705 .dellink = ipvlan_link_delete,
706 .get_link_net = ipvlan_get_link_net,
707};
708
709int ipvlan_link_register(struct rtnl_link_ops *ops)
710{
711 ops->get_size = ipvlan_nl_getsize;
712 ops->policy = ipvlan_nl_policy;
713 ops->validate = ipvlan_nl_validate;
714 ops->fill_info = ipvlan_nl_fillinfo;
715 ops->changelink = ipvlan_nl_changelink;
716 ops->maxtype = IFLA_IPVLAN_MAX;
717 return rtnl_link_register(ops);
718}
719EXPORT_SYMBOL_GPL(ipvlan_link_register);
720
721static int ipvlan_device_event(struct notifier_block *unused,
722 unsigned long event, void *ptr)
723{
724 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
725 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
726 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
727 struct ipvl_dev *ipvlan, *next;
728 struct ipvl_port *port;
729 LIST_HEAD(lst_kill);
730 int err;
731
732 if (!netif_is_ipvlan_port(dev))
733 return NOTIFY_DONE;
734
735 port = ipvlan_port_get_rtnl(dev);
736
737 switch (event) {
738 case NETDEV_UP:
739 case NETDEV_DOWN:
740 case NETDEV_CHANGE:
741 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
742 netif_stacked_transfer_operstate(ipvlan->phy_dev,
743 ipvlan->dev);
744 break;
745
746 case NETDEV_REGISTER: {
747 struct net *oldnet, *newnet = dev_net(dev);
748
749 oldnet = read_pnet(&port->pnet);
750 if (net_eq(newnet, oldnet))
751 break;
752
753 write_pnet(&port->pnet, newnet);
754
755 if (port->mode == IPVLAN_MODE_L3S)
756 ipvlan_migrate_l3s_hook(oldnet, newnet);
757 break;
758 }
759 case NETDEV_UNREGISTER:
760 if (dev->reg_state != NETREG_UNREGISTERING)
761 break;
762
763 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
764 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
765 &lst_kill);
766 unregister_netdevice_many(&lst_kill);
767 break;
768
769 case NETDEV_FEAT_CHANGE:
770 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
771 netif_inherit_tso_max(ipvlan->dev, dev);
772 netdev_update_features(ipvlan->dev);
773 }
774 break;
775
776 case NETDEV_CHANGEMTU:
777 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
778 ipvlan_adjust_mtu(ipvlan, dev);
779 break;
780
781 case NETDEV_PRE_CHANGEADDR:
782 prechaddr_info = ptr;
783 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
784 err = dev_pre_changeaddr_notify(ipvlan->dev,
785 prechaddr_info->dev_addr,
786 extack);
787 if (err)
788 return notifier_from_errno(err);
789 }
790 break;
791
792 case NETDEV_CHANGEADDR:
793 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
794 eth_hw_addr_set(ipvlan->dev, dev->dev_addr);
795 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
796 }
797 break;
798
799 case NETDEV_PRE_TYPE_CHANGE:
800 /* Forbid underlying device to change its type. */
801 return NOTIFY_BAD;
802 }
803 return NOTIFY_DONE;
804}
805
806/* the caller must held the addrs lock */
807static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
808{
809 struct ipvl_addr *addr;
810
811 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
812 if (!addr)
813 return -ENOMEM;
814
815 addr->master = ipvlan;
816 if (!is_v6) {
817 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
818 addr->atype = IPVL_IPV4;
819#if IS_ENABLED(CONFIG_IPV6)
820 } else {
821 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
822 addr->atype = IPVL_IPV6;
823#endif
824 }
825
826 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
827
828 /* If the interface is not up, the address will be added to the hash
829 * list by ipvlan_open.
830 */
831 if (netif_running(ipvlan->dev))
832 ipvlan_ht_addr_add(ipvlan, addr);
833
834 return 0;
835}
836
837static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
838{
839 struct ipvl_addr *addr;
840
841 spin_lock_bh(&ipvlan->addrs_lock);
842 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
843 if (!addr) {
844 spin_unlock_bh(&ipvlan->addrs_lock);
845 return;
846 }
847
848 ipvlan_ht_addr_del(addr);
849 list_del_rcu(&addr->anode);
850 spin_unlock_bh(&ipvlan->addrs_lock);
851 kfree_rcu(addr, rcu);
852}
853
854static bool ipvlan_is_valid_dev(const struct net_device *dev)
855{
856 struct ipvl_dev *ipvlan = netdev_priv(dev);
857
858 if (!netif_is_ipvlan(dev))
859 return false;
860
861 if (!ipvlan || !ipvlan->port)
862 return false;
863
864 return true;
865}
866
867#if IS_ENABLED(CONFIG_IPV6)
868static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
869{
870 int ret = -EINVAL;
871
872 spin_lock_bh(&ipvlan->addrs_lock);
873 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
874 netif_err(ipvlan, ifup, ipvlan->dev,
875 "Failed to add IPv6=%pI6c addr for %s intf\n",
876 ip6_addr, ipvlan->dev->name);
877 else
878 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
879 spin_unlock_bh(&ipvlan->addrs_lock);
880 return ret;
881}
882
883static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
884{
885 return ipvlan_del_addr(ipvlan, ip6_addr, true);
886}
887
888static int ipvlan_addr6_event(struct notifier_block *unused,
889 unsigned long event, void *ptr)
890{
891 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
892 struct net_device *dev = (struct net_device *)if6->idev->dev;
893 struct ipvl_dev *ipvlan = netdev_priv(dev);
894
895 if (!ipvlan_is_valid_dev(dev))
896 return NOTIFY_DONE;
897
898 switch (event) {
899 case NETDEV_UP:
900 if (ipvlan_add_addr6(ipvlan, &if6->addr))
901 return NOTIFY_BAD;
902 break;
903
904 case NETDEV_DOWN:
905 ipvlan_del_addr6(ipvlan, &if6->addr);
906 break;
907 }
908
909 return NOTIFY_OK;
910}
911
912static int ipvlan_addr6_validator_event(struct notifier_block *unused,
913 unsigned long event, void *ptr)
914{
915 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
916 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
917 struct ipvl_dev *ipvlan = netdev_priv(dev);
918
919 if (!ipvlan_is_valid_dev(dev))
920 return NOTIFY_DONE;
921
922 switch (event) {
923 case NETDEV_UP:
924 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
925 NL_SET_ERR_MSG(i6vi->extack,
926 "Address already assigned to an ipvlan device");
927 return notifier_from_errno(-EADDRINUSE);
928 }
929 break;
930 }
931
932 return NOTIFY_OK;
933}
934#endif
935
936static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
937{
938 int ret = -EINVAL;
939
940 spin_lock_bh(&ipvlan->addrs_lock);
941 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
942 netif_err(ipvlan, ifup, ipvlan->dev,
943 "Failed to add IPv4=%pI4 on %s intf.\n",
944 ip4_addr, ipvlan->dev->name);
945 else
946 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
947 spin_unlock_bh(&ipvlan->addrs_lock);
948 return ret;
949}
950
951static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
952{
953 return ipvlan_del_addr(ipvlan, ip4_addr, false);
954}
955
956static int ipvlan_addr4_event(struct notifier_block *unused,
957 unsigned long event, void *ptr)
958{
959 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
960 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
961 struct ipvl_dev *ipvlan = netdev_priv(dev);
962 struct in_addr ip4_addr;
963
964 if (!ipvlan_is_valid_dev(dev))
965 return NOTIFY_DONE;
966
967 switch (event) {
968 case NETDEV_UP:
969 ip4_addr.s_addr = if4->ifa_address;
970 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
971 return NOTIFY_BAD;
972 break;
973
974 case NETDEV_DOWN:
975 ip4_addr.s_addr = if4->ifa_address;
976 ipvlan_del_addr4(ipvlan, &ip4_addr);
977 break;
978 }
979
980 return NOTIFY_OK;
981}
982
983static int ipvlan_addr4_validator_event(struct notifier_block *unused,
984 unsigned long event, void *ptr)
985{
986 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
987 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
988 struct ipvl_dev *ipvlan = netdev_priv(dev);
989
990 if (!ipvlan_is_valid_dev(dev))
991 return NOTIFY_DONE;
992
993 switch (event) {
994 case NETDEV_UP:
995 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
996 NL_SET_ERR_MSG(ivi->extack,
997 "Address already assigned to an ipvlan device");
998 return notifier_from_errno(-EADDRINUSE);
999 }
1000 break;
1001 }
1002
1003 return NOTIFY_OK;
1004}
1005
1006static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1007 .notifier_call = ipvlan_addr4_event,
1008};
1009
1010static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1011 .notifier_call = ipvlan_addr4_validator_event,
1012};
1013
1014static struct notifier_block ipvlan_notifier_block __read_mostly = {
1015 .notifier_call = ipvlan_device_event,
1016};
1017
1018#if IS_ENABLED(CONFIG_IPV6)
1019static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1020 .notifier_call = ipvlan_addr6_event,
1021};
1022
1023static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1024 .notifier_call = ipvlan_addr6_validator_event,
1025};
1026#endif
1027
1028static int __init ipvlan_init_module(void)
1029{
1030 int err;
1031
1032 ipvlan_init_secret();
1033 register_netdevice_notifier(&ipvlan_notifier_block);
1034#if IS_ENABLED(CONFIG_IPV6)
1035 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1036 register_inet6addr_validator_notifier(
1037 &ipvlan_addr6_vtor_notifier_block);
1038#endif
1039 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1040 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1041
1042 err = ipvlan_l3s_init();
1043 if (err < 0)
1044 goto error;
1045
1046 err = ipvlan_link_register(&ipvlan_link_ops);
1047 if (err < 0) {
1048 ipvlan_l3s_cleanup();
1049 goto error;
1050 }
1051
1052 return 0;
1053error:
1054 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1055 unregister_inetaddr_validator_notifier(
1056 &ipvlan_addr4_vtor_notifier_block);
1057#if IS_ENABLED(CONFIG_IPV6)
1058 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1059 unregister_inet6addr_validator_notifier(
1060 &ipvlan_addr6_vtor_notifier_block);
1061#endif
1062 unregister_netdevice_notifier(&ipvlan_notifier_block);
1063 return err;
1064}
1065
1066static void __exit ipvlan_cleanup_module(void)
1067{
1068 rtnl_link_unregister(&ipvlan_link_ops);
1069 ipvlan_l3s_cleanup();
1070 unregister_netdevice_notifier(&ipvlan_notifier_block);
1071 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1072 unregister_inetaddr_validator_notifier(
1073 &ipvlan_addr4_vtor_notifier_block);
1074#if IS_ENABLED(CONFIG_IPV6)
1075 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1076 unregister_inet6addr_validator_notifier(
1077 &ipvlan_addr6_vtor_notifier_block);
1078#endif
1079}
1080
1081module_init(ipvlan_init_module);
1082module_exit(ipvlan_cleanup_module);
1083
1084MODULE_LICENSE("GPL");
1085MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1086MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1087MODULE_ALIAS_RTNL_LINK("ipvlan");
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 u32 ipvl_nf_hook_refcnt = 0;
13
14static 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
29static const struct l3mdev_ops ipvl_l3mdev_ops = {
30 .l3mdev_l3_rcv = ipvlan_l3_rcv,
31};
32
33static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
34{
35 ipvlan->dev->mtu = dev->mtu;
36}
37
38static 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
53static 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
62static 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
95static 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
130err:
131 kfree(port);
132 return err;
133}
134
135static void ipvlan_port_destroy(struct net_device *dev)
136{
137 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
138 struct sk_buff *skb;
139
140 dev->priv_flags &= ~IFF_IPVLAN_MASTER;
141 if (port->mode == IPVLAN_MODE_L3S) {
142 dev->priv_flags &= ~IFF_L3MDEV_MASTER;
143 ipvlan_unregister_nf_hook();
144 dev->l3mdev_ops = NULL;
145 }
146 netdev_rx_handler_unregister(dev);
147 cancel_work_sync(&port->wq);
148 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
149 if (skb->dev)
150 dev_put(skb->dev);
151 kfree_skb(skb);
152 }
153 kfree(port);
154}
155
156#define IPVLAN_FEATURES \
157 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
158 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
159 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
160 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
161
162#define IPVLAN_STATE_MASK \
163 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
164
165static int ipvlan_init(struct net_device *dev)
166{
167 struct ipvl_dev *ipvlan = netdev_priv(dev);
168 const struct net_device *phy_dev = ipvlan->phy_dev;
169 struct ipvl_port *port = ipvlan->port;
170
171 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
172 (phy_dev->state & IPVLAN_STATE_MASK);
173 dev->features = phy_dev->features & IPVLAN_FEATURES;
174 dev->features |= NETIF_F_LLTX;
175 dev->gso_max_size = phy_dev->gso_max_size;
176 dev->gso_max_segs = phy_dev->gso_max_segs;
177 dev->hard_header_len = phy_dev->hard_header_len;
178
179 netdev_lockdep_set_classes(dev);
180
181 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats);
182 if (!ipvlan->pcpu_stats)
183 return -ENOMEM;
184
185 port->count += 1;
186
187 return 0;
188}
189
190static void ipvlan_uninit(struct net_device *dev)
191{
192 struct ipvl_dev *ipvlan = netdev_priv(dev);
193 struct ipvl_port *port = ipvlan->port;
194
195 free_percpu(ipvlan->pcpu_stats);
196
197 port->count -= 1;
198 if (!port->count)
199 ipvlan_port_destroy(port->dev);
200}
201
202static int ipvlan_open(struct net_device *dev)
203{
204 struct ipvl_dev *ipvlan = netdev_priv(dev);
205 struct net_device *phy_dev = ipvlan->phy_dev;
206 struct ipvl_addr *addr;
207
208 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
209 ipvlan->port->mode == IPVLAN_MODE_L3S)
210 dev->flags |= IFF_NOARP;
211 else
212 dev->flags &= ~IFF_NOARP;
213
214 list_for_each_entry(addr, &ipvlan->addrs, anode)
215 ipvlan_ht_addr_add(ipvlan, addr);
216
217 return dev_uc_add(phy_dev, phy_dev->dev_addr);
218}
219
220static int ipvlan_stop(struct net_device *dev)
221{
222 struct ipvl_dev *ipvlan = netdev_priv(dev);
223 struct net_device *phy_dev = ipvlan->phy_dev;
224 struct ipvl_addr *addr;
225
226 dev_uc_unsync(phy_dev, dev);
227 dev_mc_unsync(phy_dev, dev);
228
229 dev_uc_del(phy_dev, phy_dev->dev_addr);
230
231 list_for_each_entry(addr, &ipvlan->addrs, anode)
232 ipvlan_ht_addr_del(addr);
233
234 return 0;
235}
236
237static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
238 struct net_device *dev)
239{
240 const struct ipvl_dev *ipvlan = netdev_priv(dev);
241 int skblen = skb->len;
242 int ret;
243
244 ret = ipvlan_queue_xmit(skb, dev);
245 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
246 struct ipvl_pcpu_stats *pcptr;
247
248 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
249
250 u64_stats_update_begin(&pcptr->syncp);
251 pcptr->tx_pkts++;
252 pcptr->tx_bytes += skblen;
253 u64_stats_update_end(&pcptr->syncp);
254 } else {
255 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
256 }
257 return ret;
258}
259
260static netdev_features_t ipvlan_fix_features(struct net_device *dev,
261 netdev_features_t features)
262{
263 struct ipvl_dev *ipvlan = netdev_priv(dev);
264
265 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
266}
267
268static void ipvlan_change_rx_flags(struct net_device *dev, int change)
269{
270 struct ipvl_dev *ipvlan = netdev_priv(dev);
271 struct net_device *phy_dev = ipvlan->phy_dev;
272
273 if (change & IFF_ALLMULTI)
274 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
275}
276
277static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
278{
279 struct ipvl_dev *ipvlan = netdev_priv(dev);
280
281 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
282 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
283 } else {
284 struct netdev_hw_addr *ha;
285 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
286
287 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
288 netdev_for_each_mc_addr(ha, dev)
289 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
290
291 /* Turn-on broadcast bit irrespective of address family,
292 * since broadcast is deferred to a work-queue, hence no
293 * impact on fast-path processing.
294 */
295 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
296
297 bitmap_copy(ipvlan->mac_filters, mc_filters,
298 IPVLAN_MAC_FILTER_SIZE);
299 }
300 dev_uc_sync(ipvlan->phy_dev, dev);
301 dev_mc_sync(ipvlan->phy_dev, dev);
302}
303
304static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev,
305 struct rtnl_link_stats64 *s)
306{
307 struct ipvl_dev *ipvlan = netdev_priv(dev);
308
309 if (ipvlan->pcpu_stats) {
310 struct ipvl_pcpu_stats *pcptr;
311 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
312 u32 rx_errs = 0, tx_drps = 0;
313 u32 strt;
314 int idx;
315
316 for_each_possible_cpu(idx) {
317 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
318 do {
319 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
320 rx_pkts = pcptr->rx_pkts;
321 rx_bytes = pcptr->rx_bytes;
322 rx_mcast = pcptr->rx_mcast;
323 tx_pkts = pcptr->tx_pkts;
324 tx_bytes = pcptr->tx_bytes;
325 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
326 strt));
327
328 s->rx_packets += rx_pkts;
329 s->rx_bytes += rx_bytes;
330 s->multicast += rx_mcast;
331 s->tx_packets += tx_pkts;
332 s->tx_bytes += tx_bytes;
333
334 /* u32 values are updated without syncp protection. */
335 rx_errs += pcptr->rx_errs;
336 tx_drps += pcptr->tx_drps;
337 }
338 s->rx_errors = rx_errs;
339 s->rx_dropped = rx_errs;
340 s->tx_dropped = tx_drps;
341 }
342 return s;
343}
344
345static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
346{
347 struct ipvl_dev *ipvlan = netdev_priv(dev);
348 struct net_device *phy_dev = ipvlan->phy_dev;
349
350 return vlan_vid_add(phy_dev, proto, vid);
351}
352
353static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
354 u16 vid)
355{
356 struct ipvl_dev *ipvlan = netdev_priv(dev);
357 struct net_device *phy_dev = ipvlan->phy_dev;
358
359 vlan_vid_del(phy_dev, proto, vid);
360 return 0;
361}
362
363static int ipvlan_get_iflink(const struct net_device *dev)
364{
365 struct ipvl_dev *ipvlan = netdev_priv(dev);
366
367 return ipvlan->phy_dev->ifindex;
368}
369
370static const struct net_device_ops ipvlan_netdev_ops = {
371 .ndo_init = ipvlan_init,
372 .ndo_uninit = ipvlan_uninit,
373 .ndo_open = ipvlan_open,
374 .ndo_stop = ipvlan_stop,
375 .ndo_start_xmit = ipvlan_start_xmit,
376 .ndo_fix_features = ipvlan_fix_features,
377 .ndo_change_rx_flags = ipvlan_change_rx_flags,
378 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
379 .ndo_get_stats64 = ipvlan_get_stats64,
380 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
381 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
382 .ndo_get_iflink = ipvlan_get_iflink,
383};
384
385static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
386 unsigned short type, const void *daddr,
387 const void *saddr, unsigned len)
388{
389 const struct ipvl_dev *ipvlan = netdev_priv(dev);
390 struct net_device *phy_dev = ipvlan->phy_dev;
391
392 /* TODO Probably use a different field than dev_addr so that the
393 * mac-address on the virtual device is portable and can be carried
394 * while the packets use the mac-addr on the physical device.
395 */
396 return dev_hard_header(skb, phy_dev, type, daddr,
397 saddr ? : dev->dev_addr, len);
398}
399
400static const struct header_ops ipvlan_header_ops = {
401 .create = ipvlan_hard_header,
402 .parse = eth_header_parse,
403 .cache = eth_header_cache,
404 .cache_update = eth_header_cache_update,
405};
406
407static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
408 struct ethtool_link_ksettings *cmd)
409{
410 const struct ipvl_dev *ipvlan = netdev_priv(dev);
411
412 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
413}
414
415static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
416 struct ethtool_drvinfo *drvinfo)
417{
418 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
419 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
420}
421
422static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
423{
424 const struct ipvl_dev *ipvlan = netdev_priv(dev);
425
426 return ipvlan->msg_enable;
427}
428
429static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
430{
431 struct ipvl_dev *ipvlan = netdev_priv(dev);
432
433 ipvlan->msg_enable = value;
434}
435
436static const struct ethtool_ops ipvlan_ethtool_ops = {
437 .get_link = ethtool_op_get_link,
438 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
439 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
440 .get_msglevel = ipvlan_ethtool_get_msglevel,
441 .set_msglevel = ipvlan_ethtool_set_msglevel,
442};
443
444static int ipvlan_nl_changelink(struct net_device *dev,
445 struct nlattr *tb[], struct nlattr *data[])
446{
447 struct ipvl_dev *ipvlan = netdev_priv(dev);
448 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
449 int err = 0;
450
451 if (data && data[IFLA_IPVLAN_MODE]) {
452 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
453
454 err = ipvlan_set_port_mode(port, nmode);
455 }
456 return err;
457}
458
459static size_t ipvlan_nl_getsize(const struct net_device *dev)
460{
461 return (0
462 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
463 );
464}
465
466static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[])
467{
468 if (data && data[IFLA_IPVLAN_MODE]) {
469 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
470
471 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
472 return -EINVAL;
473 }
474 return 0;
475}
476
477static int ipvlan_nl_fillinfo(struct sk_buff *skb,
478 const struct net_device *dev)
479{
480 struct ipvl_dev *ipvlan = netdev_priv(dev);
481 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
482 int ret = -EINVAL;
483
484 if (!port)
485 goto err;
486
487 ret = -EMSGSIZE;
488 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
489 goto err;
490
491 return 0;
492
493err:
494 return ret;
495}
496
497static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
498 struct nlattr *tb[], struct nlattr *data[])
499{
500 struct ipvl_dev *ipvlan = netdev_priv(dev);
501 struct ipvl_port *port;
502 struct net_device *phy_dev;
503 int err;
504 u16 mode = IPVLAN_MODE_L3;
505 bool create = false;
506
507 if (!tb[IFLA_LINK])
508 return -EINVAL;
509
510 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
511 if (!phy_dev)
512 return -ENODEV;
513
514 if (netif_is_ipvlan(phy_dev)) {
515 struct ipvl_dev *tmp = netdev_priv(phy_dev);
516
517 phy_dev = tmp->phy_dev;
518 } else if (!netif_is_ipvlan_port(phy_dev)) {
519 err = ipvlan_port_create(phy_dev);
520 if (err < 0)
521 return err;
522 create = true;
523 }
524
525 if (data && data[IFLA_IPVLAN_MODE])
526 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
527
528 port = ipvlan_port_get_rtnl(phy_dev);
529 ipvlan->phy_dev = phy_dev;
530 ipvlan->dev = dev;
531 ipvlan->port = port;
532 ipvlan->sfeatures = IPVLAN_FEATURES;
533 ipvlan_adjust_mtu(ipvlan, phy_dev);
534 INIT_LIST_HEAD(&ipvlan->addrs);
535
536 /* TODO Probably put random address here to be presented to the
537 * world but keep using the physical-dev address for the outgoing
538 * packets.
539 */
540 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
541
542 dev->priv_flags |= IFF_IPVLAN_SLAVE;
543
544 err = register_netdevice(dev);
545 if (err < 0)
546 goto destroy_ipvlan_port;
547
548 err = netdev_upper_dev_link(phy_dev, dev);
549 if (err) {
550 goto unregister_netdev;
551 }
552 err = ipvlan_set_port_mode(port, mode);
553 if (err) {
554 goto unlink_netdev;
555 }
556
557 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
558 netif_stacked_transfer_operstate(phy_dev, dev);
559 return 0;
560
561unlink_netdev:
562 netdev_upper_dev_unlink(phy_dev, dev);
563unregister_netdev:
564 unregister_netdevice(dev);
565destroy_ipvlan_port:
566 if (create)
567 ipvlan_port_destroy(phy_dev);
568 return err;
569}
570
571static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
572{
573 struct ipvl_dev *ipvlan = netdev_priv(dev);
574 struct ipvl_addr *addr, *next;
575
576 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
577 ipvlan_ht_addr_del(addr);
578 list_del(&addr->anode);
579 kfree_rcu(addr, rcu);
580 }
581
582 list_del_rcu(&ipvlan->pnode);
583 unregister_netdevice_queue(dev, head);
584 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
585}
586
587static void ipvlan_link_setup(struct net_device *dev)
588{
589 ether_setup(dev);
590
591 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
592 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
593 dev->netdev_ops = &ipvlan_netdev_ops;
594 dev->destructor = free_netdev;
595 dev->header_ops = &ipvlan_header_ops;
596 dev->ethtool_ops = &ipvlan_ethtool_ops;
597}
598
599static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
600{
601 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
602};
603
604static struct rtnl_link_ops ipvlan_link_ops = {
605 .kind = "ipvlan",
606 .priv_size = sizeof(struct ipvl_dev),
607
608 .get_size = ipvlan_nl_getsize,
609 .policy = ipvlan_nl_policy,
610 .validate = ipvlan_nl_validate,
611 .fill_info = ipvlan_nl_fillinfo,
612 .changelink = ipvlan_nl_changelink,
613 .maxtype = IFLA_IPVLAN_MAX,
614
615 .setup = ipvlan_link_setup,
616 .newlink = ipvlan_link_new,
617 .dellink = ipvlan_link_delete,
618};
619
620static int ipvlan_link_register(struct rtnl_link_ops *ops)
621{
622 return rtnl_link_register(ops);
623}
624
625static int ipvlan_device_event(struct notifier_block *unused,
626 unsigned long event, void *ptr)
627{
628 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
629 struct ipvl_dev *ipvlan, *next;
630 struct ipvl_port *port;
631 LIST_HEAD(lst_kill);
632
633 if (!netif_is_ipvlan_port(dev))
634 return NOTIFY_DONE;
635
636 port = ipvlan_port_get_rtnl(dev);
637
638 switch (event) {
639 case NETDEV_CHANGE:
640 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
641 netif_stacked_transfer_operstate(ipvlan->phy_dev,
642 ipvlan->dev);
643 break;
644
645 case NETDEV_UNREGISTER:
646 if (dev->reg_state != NETREG_UNREGISTERING)
647 break;
648
649 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
650 pnode)
651 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
652 &lst_kill);
653 unregister_netdevice_many(&lst_kill);
654 break;
655
656 case NETDEV_FEAT_CHANGE:
657 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
658 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
659 ipvlan->dev->gso_max_size = dev->gso_max_size;
660 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
661 netdev_features_change(ipvlan->dev);
662 }
663 break;
664
665 case NETDEV_CHANGEMTU:
666 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
667 ipvlan_adjust_mtu(ipvlan, dev);
668 break;
669
670 case NETDEV_PRE_TYPE_CHANGE:
671 /* Forbid underlying device to change its type. */
672 return NOTIFY_BAD;
673 }
674 return NOTIFY_DONE;
675}
676
677static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
678{
679 struct ipvl_addr *addr;
680
681 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
682 netif_err(ipvlan, ifup, ipvlan->dev,
683 "Failed to add IPv6=%pI6c addr for %s intf\n",
684 ip6_addr, ipvlan->dev->name);
685 return -EINVAL;
686 }
687 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
688 if (!addr)
689 return -ENOMEM;
690
691 addr->master = ipvlan;
692 memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr));
693 addr->atype = IPVL_IPV6;
694 list_add_tail(&addr->anode, &ipvlan->addrs);
695
696 /* If the interface is not up, the address will be added to the hash
697 * list by ipvlan_open.
698 */
699 if (netif_running(ipvlan->dev))
700 ipvlan_ht_addr_add(ipvlan, addr);
701
702 return 0;
703}
704
705static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
706{
707 struct ipvl_addr *addr;
708
709 addr = ipvlan_find_addr(ipvlan, ip6_addr, true);
710 if (!addr)
711 return;
712
713 ipvlan_ht_addr_del(addr);
714 list_del(&addr->anode);
715 kfree_rcu(addr, rcu);
716
717 return;
718}
719
720static int ipvlan_addr6_event(struct notifier_block *unused,
721 unsigned long event, void *ptr)
722{
723 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
724 struct net_device *dev = (struct net_device *)if6->idev->dev;
725 struct ipvl_dev *ipvlan = netdev_priv(dev);
726
727 /* FIXME IPv6 autoconf calls us from bh without RTNL */
728 if (in_softirq())
729 return NOTIFY_DONE;
730
731 if (!netif_is_ipvlan(dev))
732 return NOTIFY_DONE;
733
734 if (!ipvlan || !ipvlan->port)
735 return NOTIFY_DONE;
736
737 switch (event) {
738 case NETDEV_UP:
739 if (ipvlan_add_addr6(ipvlan, &if6->addr))
740 return NOTIFY_BAD;
741 break;
742
743 case NETDEV_DOWN:
744 ipvlan_del_addr6(ipvlan, &if6->addr);
745 break;
746 }
747
748 return NOTIFY_OK;
749}
750
751static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
752{
753 struct ipvl_addr *addr;
754
755 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
756 netif_err(ipvlan, ifup, ipvlan->dev,
757 "Failed to add IPv4=%pI4 on %s intf.\n",
758 ip4_addr, ipvlan->dev->name);
759 return -EINVAL;
760 }
761 addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL);
762 if (!addr)
763 return -ENOMEM;
764
765 addr->master = ipvlan;
766 memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr));
767 addr->atype = IPVL_IPV4;
768 list_add_tail(&addr->anode, &ipvlan->addrs);
769
770 /* If the interface is not up, the address will be added to the hash
771 * list by ipvlan_open.
772 */
773 if (netif_running(ipvlan->dev))
774 ipvlan_ht_addr_add(ipvlan, addr);
775
776 return 0;
777}
778
779static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
780{
781 struct ipvl_addr *addr;
782
783 addr = ipvlan_find_addr(ipvlan, ip4_addr, false);
784 if (!addr)
785 return;
786
787 ipvlan_ht_addr_del(addr);
788 list_del(&addr->anode);
789 kfree_rcu(addr, rcu);
790
791 return;
792}
793
794static int ipvlan_addr4_event(struct notifier_block *unused,
795 unsigned long event, void *ptr)
796{
797 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
798 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
799 struct ipvl_dev *ipvlan = netdev_priv(dev);
800 struct in_addr ip4_addr;
801
802 if (!netif_is_ipvlan(dev))
803 return NOTIFY_DONE;
804
805 if (!ipvlan || !ipvlan->port)
806 return NOTIFY_DONE;
807
808 switch (event) {
809 case NETDEV_UP:
810 ip4_addr.s_addr = if4->ifa_address;
811 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
812 return NOTIFY_BAD;
813 break;
814
815 case NETDEV_DOWN:
816 ip4_addr.s_addr = if4->ifa_address;
817 ipvlan_del_addr4(ipvlan, &ip4_addr);
818 break;
819 }
820
821 return NOTIFY_OK;
822}
823
824static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
825 .notifier_call = ipvlan_addr4_event,
826};
827
828static struct notifier_block ipvlan_notifier_block __read_mostly = {
829 .notifier_call = ipvlan_device_event,
830};
831
832static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
833 .notifier_call = ipvlan_addr6_event,
834};
835
836static int __init ipvlan_init_module(void)
837{
838 int err;
839
840 ipvlan_init_secret();
841 register_netdevice_notifier(&ipvlan_notifier_block);
842 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
843 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
844
845 err = ipvlan_link_register(&ipvlan_link_ops);
846 if (err < 0)
847 goto error;
848
849 return 0;
850error:
851 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
852 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
853 unregister_netdevice_notifier(&ipvlan_notifier_block);
854 return err;
855}
856
857static void __exit ipvlan_cleanup_module(void)
858{
859 rtnl_link_unregister(&ipvlan_link_ops);
860 unregister_netdevice_notifier(&ipvlan_notifier_block);
861 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
862 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
863}
864
865module_init(ipvlan_init_module);
866module_exit(ipvlan_cleanup_module);
867
868MODULE_LICENSE("GPL");
869MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
870MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
871MODULE_ALIAS_RTNL_LINK("ipvlan");