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10#include "ipvlan.h"
11
12static unsigned int ipvlan_netid __read_mostly;
13
14struct ipvlan_netns {
15 unsigned int ipvl_nf_hook_refcnt;
16};
17
18static const struct nf_hook_ops ipvl_nfops[] = {
19 {
20 .hook = ipvlan_nf_input,
21 .pf = NFPROTO_IPV4,
22 .hooknum = NF_INET_LOCAL_IN,
23 .priority = INT_MAX,
24 },
25#if IS_ENABLED(CONFIG_IPV6)
26 {
27 .hook = ipvlan_nf_input,
28 .pf = NFPROTO_IPV6,
29 .hooknum = NF_INET_LOCAL_IN,
30 .priority = INT_MAX,
31 },
32#endif
33};
34
35static const struct l3mdev_ops ipvl_l3mdev_ops = {
36 .l3mdev_l3_rcv = ipvlan_l3_rcv,
37};
38
39static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
40{
41 ipvlan->dev->mtu = dev->mtu;
42}
43
44static int ipvlan_register_nf_hook(struct net *net)
45{
46 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
47 int err = 0;
48
49 if (!vnet->ipvl_nf_hook_refcnt) {
50 err = nf_register_net_hooks(net, ipvl_nfops,
51 ARRAY_SIZE(ipvl_nfops));
52 if (!err)
53 vnet->ipvl_nf_hook_refcnt = 1;
54 } else {
55 vnet->ipvl_nf_hook_refcnt++;
56 }
57
58 return err;
59}
60
61static void ipvlan_unregister_nf_hook(struct net *net)
62{
63 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
64
65 if (WARN_ON(!vnet->ipvl_nf_hook_refcnt))
66 return;
67
68 vnet->ipvl_nf_hook_refcnt--;
69 if (!vnet->ipvl_nf_hook_refcnt)
70 nf_unregister_net_hooks(net, ipvl_nfops,
71 ARRAY_SIZE(ipvl_nfops));
72}
73
74static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
75 struct netlink_ext_ack *extack)
76{
77 struct ipvl_dev *ipvlan;
78 struct net_device *mdev = port->dev;
79 unsigned int flags;
80 int err;
81
82 ASSERT_RTNL();
83 if (port->mode != nval) {
84 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
85 flags = ipvlan->dev->flags;
86 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
87 err = dev_change_flags(ipvlan->dev,
88 flags | IFF_NOARP,
89 extack);
90 } else {
91 err = dev_change_flags(ipvlan->dev,
92 flags & ~IFF_NOARP,
93 extack);
94 }
95 if (unlikely(err))
96 goto fail;
97 }
98 if (nval == IPVLAN_MODE_L3S) {
99
100 err = ipvlan_register_nf_hook(read_pnet(&port->pnet));
101 if (!err) {
102 mdev->l3mdev_ops = &ipvl_l3mdev_ops;
103 mdev->priv_flags |= IFF_L3MDEV_RX_HANDLER;
104 } else
105 goto fail;
106 } else if (port->mode == IPVLAN_MODE_L3S) {
107
108 mdev->priv_flags &= ~IFF_L3MDEV_RX_HANDLER;
109 ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
110 mdev->l3mdev_ops = NULL;
111 }
112 port->mode = nval;
113 }
114 return 0;
115
116fail:
117
118 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
119 flags = ipvlan->dev->flags;
120 if (port->mode == IPVLAN_MODE_L3 ||
121 port->mode == IPVLAN_MODE_L3S)
122 dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
123 NULL);
124 else
125 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
126 NULL);
127 }
128
129 return err;
130}
131
132static int ipvlan_port_create(struct net_device *dev)
133{
134 struct ipvl_port *port;
135 int err, idx;
136
137 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
138 if (!port)
139 return -ENOMEM;
140
141 write_pnet(&port->pnet, dev_net(dev));
142 port->dev = dev;
143 port->mode = IPVLAN_MODE_L3;
144 INIT_LIST_HEAD(&port->ipvlans);
145 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
146 INIT_HLIST_HEAD(&port->hlhead[idx]);
147
148 skb_queue_head_init(&port->backlog);
149 INIT_WORK(&port->wq, ipvlan_process_multicast);
150 ida_init(&port->ida);
151 port->dev_id_start = 1;
152
153 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
154 if (err)
155 goto err;
156
157 return 0;
158
159err:
160 kfree(port);
161 return err;
162}
163
164static void ipvlan_port_destroy(struct net_device *dev)
165{
166 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
167 struct sk_buff *skb;
168
169 if (port->mode == IPVLAN_MODE_L3S) {
170 dev->priv_flags &= ~IFF_L3MDEV_RX_HANDLER;
171 ipvlan_unregister_nf_hook(dev_net(dev));
172 dev->l3mdev_ops = NULL;
173 }
174 netdev_rx_handler_unregister(dev);
175 cancel_work_sync(&port->wq);
176 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
177 if (skb->dev)
178 dev_put(skb->dev);
179 kfree_skb(skb);
180 }
181 ida_destroy(&port->ida);
182 kfree(port);
183}
184
185#define IPVLAN_FEATURES \
186 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
187 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
188 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
189 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
190
191#define IPVLAN_STATE_MASK \
192 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
193
194static int ipvlan_init(struct net_device *dev)
195{
196 struct ipvl_dev *ipvlan = netdev_priv(dev);
197 struct net_device *phy_dev = ipvlan->phy_dev;
198 struct ipvl_port *port;
199 int err;
200
201 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
202 (phy_dev->state & IPVLAN_STATE_MASK);
203 dev->features = phy_dev->features & IPVLAN_FEATURES;
204 dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
205 dev->gso_max_size = phy_dev->gso_max_size;
206 dev->gso_max_segs = phy_dev->gso_max_segs;
207 dev->hard_header_len = phy_dev->hard_header_len;
208
209 netdev_lockdep_set_classes(dev);
210
211 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
212 if (!ipvlan->pcpu_stats)
213 return -ENOMEM;
214
215 if (!netif_is_ipvlan_port(phy_dev)) {
216 err = ipvlan_port_create(phy_dev);
217 if (err < 0) {
218 free_percpu(ipvlan->pcpu_stats);
219 return err;
220 }
221 }
222 port = ipvlan_port_get_rtnl(phy_dev);
223 port->count += 1;
224 return 0;
225}
226
227static void ipvlan_uninit(struct net_device *dev)
228{
229 struct ipvl_dev *ipvlan = netdev_priv(dev);
230 struct net_device *phy_dev = ipvlan->phy_dev;
231 struct ipvl_port *port;
232
233 free_percpu(ipvlan->pcpu_stats);
234
235 port = ipvlan_port_get_rtnl(phy_dev);
236 port->count -= 1;
237 if (!port->count)
238 ipvlan_port_destroy(port->dev);
239}
240
241static int ipvlan_open(struct net_device *dev)
242{
243 struct ipvl_dev *ipvlan = netdev_priv(dev);
244 struct net_device *phy_dev = ipvlan->phy_dev;
245 struct ipvl_addr *addr;
246
247 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
248 ipvlan->port->mode == IPVLAN_MODE_L3S)
249 dev->flags |= IFF_NOARP;
250 else
251 dev->flags &= ~IFF_NOARP;
252
253 rcu_read_lock();
254 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
255 ipvlan_ht_addr_add(ipvlan, addr);
256 rcu_read_unlock();
257
258 return dev_uc_add(phy_dev, phy_dev->dev_addr);
259}
260
261static int ipvlan_stop(struct net_device *dev)
262{
263 struct ipvl_dev *ipvlan = netdev_priv(dev);
264 struct net_device *phy_dev = ipvlan->phy_dev;
265 struct ipvl_addr *addr;
266
267 dev_uc_unsync(phy_dev, dev);
268 dev_mc_unsync(phy_dev, dev);
269
270 dev_uc_del(phy_dev, phy_dev->dev_addr);
271
272 rcu_read_lock();
273 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
274 ipvlan_ht_addr_del(addr);
275 rcu_read_unlock();
276
277 return 0;
278}
279
280static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
281 struct net_device *dev)
282{
283 const struct ipvl_dev *ipvlan = netdev_priv(dev);
284 int skblen = skb->len;
285 int ret;
286
287 ret = ipvlan_queue_xmit(skb, dev);
288 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
289 struct ipvl_pcpu_stats *pcptr;
290
291 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
292
293 u64_stats_update_begin(&pcptr->syncp);
294 pcptr->tx_pkts++;
295 pcptr->tx_bytes += skblen;
296 u64_stats_update_end(&pcptr->syncp);
297 } else {
298 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
299 }
300 return ret;
301}
302
303static netdev_features_t ipvlan_fix_features(struct net_device *dev,
304 netdev_features_t features)
305{
306 struct ipvl_dev *ipvlan = netdev_priv(dev);
307
308 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
309}
310
311static void ipvlan_change_rx_flags(struct net_device *dev, int change)
312{
313 struct ipvl_dev *ipvlan = netdev_priv(dev);
314 struct net_device *phy_dev = ipvlan->phy_dev;
315
316 if (change & IFF_ALLMULTI)
317 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
318}
319
320static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
321{
322 struct ipvl_dev *ipvlan = netdev_priv(dev);
323
324 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
325 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
326 } else {
327 struct netdev_hw_addr *ha;
328 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
329
330 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
331 netdev_for_each_mc_addr(ha, dev)
332 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
333
334
335
336
337
338 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
339
340 bitmap_copy(ipvlan->mac_filters, mc_filters,
341 IPVLAN_MAC_FILTER_SIZE);
342 }
343 dev_uc_sync(ipvlan->phy_dev, dev);
344 dev_mc_sync(ipvlan->phy_dev, dev);
345}
346
347static void ipvlan_get_stats64(struct net_device *dev,
348 struct rtnl_link_stats64 *s)
349{
350 struct ipvl_dev *ipvlan = netdev_priv(dev);
351
352 if (ipvlan->pcpu_stats) {
353 struct ipvl_pcpu_stats *pcptr;
354 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
355 u32 rx_errs = 0, tx_drps = 0;
356 u32 strt;
357 int idx;
358
359 for_each_possible_cpu(idx) {
360 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
361 do {
362 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
363 rx_pkts = pcptr->rx_pkts;
364 rx_bytes = pcptr->rx_bytes;
365 rx_mcast = pcptr->rx_mcast;
366 tx_pkts = pcptr->tx_pkts;
367 tx_bytes = pcptr->tx_bytes;
368 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
369 strt));
370
371 s->rx_packets += rx_pkts;
372 s->rx_bytes += rx_bytes;
373 s->multicast += rx_mcast;
374 s->tx_packets += tx_pkts;
375 s->tx_bytes += tx_bytes;
376
377
378 rx_errs += pcptr->rx_errs;
379 tx_drps += pcptr->tx_drps;
380 }
381 s->rx_errors = rx_errs;
382 s->rx_dropped = rx_errs;
383 s->tx_dropped = tx_drps;
384 }
385}
386
387static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
388{
389 struct ipvl_dev *ipvlan = netdev_priv(dev);
390 struct net_device *phy_dev = ipvlan->phy_dev;
391
392 return vlan_vid_add(phy_dev, proto, vid);
393}
394
395static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
396 u16 vid)
397{
398 struct ipvl_dev *ipvlan = netdev_priv(dev);
399 struct net_device *phy_dev = ipvlan->phy_dev;
400
401 vlan_vid_del(phy_dev, proto, vid);
402 return 0;
403}
404
405static int ipvlan_get_iflink(const struct net_device *dev)
406{
407 struct ipvl_dev *ipvlan = netdev_priv(dev);
408
409 return ipvlan->phy_dev->ifindex;
410}
411
412static const struct net_device_ops ipvlan_netdev_ops = {
413 .ndo_init = ipvlan_init,
414 .ndo_uninit = ipvlan_uninit,
415 .ndo_open = ipvlan_open,
416 .ndo_stop = ipvlan_stop,
417 .ndo_start_xmit = ipvlan_start_xmit,
418 .ndo_fix_features = ipvlan_fix_features,
419 .ndo_change_rx_flags = ipvlan_change_rx_flags,
420 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
421 .ndo_get_stats64 = ipvlan_get_stats64,
422 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
423 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
424 .ndo_get_iflink = ipvlan_get_iflink,
425};
426
427static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
428 unsigned short type, const void *daddr,
429 const void *saddr, unsigned len)
430{
431 const struct ipvl_dev *ipvlan = netdev_priv(dev);
432 struct net_device *phy_dev = ipvlan->phy_dev;
433
434
435
436
437
438 return dev_hard_header(skb, phy_dev, type, daddr,
439 saddr ? : phy_dev->dev_addr, len);
440}
441
442static const struct header_ops ipvlan_header_ops = {
443 .create = ipvlan_hard_header,
444 .parse = eth_header_parse,
445 .cache = eth_header_cache,
446 .cache_update = eth_header_cache_update,
447};
448
449static bool netif_is_ipvlan(const struct net_device *dev)
450{
451
452 return dev->netdev_ops == &ipvlan_netdev_ops;
453}
454
455static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
456 struct ethtool_link_ksettings *cmd)
457{
458 const struct ipvl_dev *ipvlan = netdev_priv(dev);
459
460 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
461}
462
463static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
464 struct ethtool_drvinfo *drvinfo)
465{
466 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
467 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
468}
469
470static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
471{
472 const struct ipvl_dev *ipvlan = netdev_priv(dev);
473
474 return ipvlan->msg_enable;
475}
476
477static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
478{
479 struct ipvl_dev *ipvlan = netdev_priv(dev);
480
481 ipvlan->msg_enable = value;
482}
483
484static const struct ethtool_ops ipvlan_ethtool_ops = {
485 .get_link = ethtool_op_get_link,
486 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
487 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
488 .get_msglevel = ipvlan_ethtool_get_msglevel,
489 .set_msglevel = ipvlan_ethtool_set_msglevel,
490};
491
492static int ipvlan_nl_changelink(struct net_device *dev,
493 struct nlattr *tb[], struct nlattr *data[],
494 struct netlink_ext_ack *extack)
495{
496 struct ipvl_dev *ipvlan = netdev_priv(dev);
497 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
498 int err = 0;
499
500 if (!data)
501 return 0;
502 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
503 return -EPERM;
504
505 if (data[IFLA_IPVLAN_MODE]) {
506 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
507
508 err = ipvlan_set_port_mode(port, nmode, extack);
509 }
510
511 if (!err && data[IFLA_IPVLAN_FLAGS]) {
512 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
513
514 if (flags & IPVLAN_F_PRIVATE)
515 ipvlan_mark_private(port);
516 else
517 ipvlan_clear_private(port);
518
519 if (flags & IPVLAN_F_VEPA)
520 ipvlan_mark_vepa(port);
521 else
522 ipvlan_clear_vepa(port);
523 }
524
525 return err;
526}
527
528static size_t ipvlan_nl_getsize(const struct net_device *dev)
529{
530 return (0
531 + nla_total_size(2)
532 + nla_total_size(2)
533 );
534}
535
536static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
537 struct netlink_ext_ack *extack)
538{
539 if (!data)
540 return 0;
541
542 if (data[IFLA_IPVLAN_MODE]) {
543 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
544
545 if (mode >= IPVLAN_MODE_MAX)
546 return -EINVAL;
547 }
548 if (data[IFLA_IPVLAN_FLAGS]) {
549 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
550
551
552 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
553 return -EINVAL;
554
555 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
556 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
557 return -EINVAL;
558 }
559
560 return 0;
561}
562
563static int ipvlan_nl_fillinfo(struct sk_buff *skb,
564 const struct net_device *dev)
565{
566 struct ipvl_dev *ipvlan = netdev_priv(dev);
567 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
568 int ret = -EINVAL;
569
570 if (!port)
571 goto err;
572
573 ret = -EMSGSIZE;
574 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
575 goto err;
576 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
577 goto err;
578
579 return 0;
580
581err:
582 return ret;
583}
584
585int ipvlan_link_new(struct net *src_net, struct net_device *dev,
586 struct nlattr *tb[], struct nlattr *data[],
587 struct netlink_ext_ack *extack)
588{
589 struct ipvl_dev *ipvlan = netdev_priv(dev);
590 struct ipvl_port *port;
591 struct net_device *phy_dev;
592 int err;
593 u16 mode = IPVLAN_MODE_L3;
594
595 if (!tb[IFLA_LINK])
596 return -EINVAL;
597
598 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
599 if (!phy_dev)
600 return -ENODEV;
601
602 if (netif_is_ipvlan(phy_dev)) {
603 struct ipvl_dev *tmp = netdev_priv(phy_dev);
604
605 phy_dev = tmp->phy_dev;
606 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
607 return -EPERM;
608 } else if (!netif_is_ipvlan_port(phy_dev)) {
609
610 if (phy_dev->type != ARPHRD_ETHER ||
611 phy_dev->flags & IFF_LOOPBACK) {
612 netdev_err(phy_dev,
613 "Master is either lo or non-ether device\n");
614 return -EINVAL;
615 }
616
617 if (netdev_is_rx_handler_busy(phy_dev)) {
618 netdev_err(phy_dev, "Device is already in use.\n");
619 return -EBUSY;
620 }
621 }
622
623 ipvlan->phy_dev = phy_dev;
624 ipvlan->dev = dev;
625 ipvlan->sfeatures = IPVLAN_FEATURES;
626 if (!tb[IFLA_MTU])
627 ipvlan_adjust_mtu(ipvlan, phy_dev);
628 INIT_LIST_HEAD(&ipvlan->addrs);
629 spin_lock_init(&ipvlan->addrs_lock);
630
631
632
633
634
635 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
636
637 dev->priv_flags |= IFF_NO_RX_HANDLER;
638
639 err = register_netdevice(dev);
640 if (err < 0)
641 return err;
642
643
644 port = ipvlan_port_get_rtnl(phy_dev);
645 ipvlan->port = port;
646
647
648
649
650
651 if (port->dev_id_start == 0xFFFE)
652 port->dev_id_start = 0x1;
653
654
655
656
657
658
659 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
660 GFP_KERNEL);
661 if (err < 0)
662 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
663 GFP_KERNEL);
664 if (err < 0)
665 goto unregister_netdev;
666 dev->dev_id = err;
667
668
669 port->dev_id_start = err + 1;
670
671 err = netdev_upper_dev_link(phy_dev, dev, extack);
672 if (err)
673 goto remove_ida;
674
675
676
677
678 if (data && data[IFLA_IPVLAN_FLAGS])
679 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
680
681 if (data && data[IFLA_IPVLAN_MODE])
682 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
683
684 err = ipvlan_set_port_mode(port, mode, extack);
685 if (err)
686 goto unlink_netdev;
687
688 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
689 netif_stacked_transfer_operstate(phy_dev, dev);
690 return 0;
691
692unlink_netdev:
693 netdev_upper_dev_unlink(phy_dev, dev);
694remove_ida:
695 ida_simple_remove(&port->ida, dev->dev_id);
696unregister_netdev:
697 unregister_netdevice(dev);
698 return err;
699}
700EXPORT_SYMBOL_GPL(ipvlan_link_new);
701
702void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
703{
704 struct ipvl_dev *ipvlan = netdev_priv(dev);
705 struct ipvl_addr *addr, *next;
706
707 spin_lock_bh(&ipvlan->addrs_lock);
708 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
709 ipvlan_ht_addr_del(addr);
710 list_del_rcu(&addr->anode);
711 kfree_rcu(addr, rcu);
712 }
713 spin_unlock_bh(&ipvlan->addrs_lock);
714
715 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
716 list_del_rcu(&ipvlan->pnode);
717 unregister_netdevice_queue(dev, head);
718 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
719}
720EXPORT_SYMBOL_GPL(ipvlan_link_delete);
721
722void ipvlan_link_setup(struct net_device *dev)
723{
724 ether_setup(dev);
725
726 dev->max_mtu = ETH_MAX_MTU;
727 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
728 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
729 dev->netdev_ops = &ipvlan_netdev_ops;
730 dev->needs_free_netdev = true;
731 dev->header_ops = &ipvlan_header_ops;
732 dev->ethtool_ops = &ipvlan_ethtool_ops;
733}
734EXPORT_SYMBOL_GPL(ipvlan_link_setup);
735
736static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
737{
738 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
739 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
740};
741
742static struct rtnl_link_ops ipvlan_link_ops = {
743 .kind = "ipvlan",
744 .priv_size = sizeof(struct ipvl_dev),
745
746 .setup = ipvlan_link_setup,
747 .newlink = ipvlan_link_new,
748 .dellink = ipvlan_link_delete,
749};
750
751int ipvlan_link_register(struct rtnl_link_ops *ops)
752{
753 ops->get_size = ipvlan_nl_getsize;
754 ops->policy = ipvlan_nl_policy;
755 ops->validate = ipvlan_nl_validate;
756 ops->fill_info = ipvlan_nl_fillinfo;
757 ops->changelink = ipvlan_nl_changelink;
758 ops->maxtype = IFLA_IPVLAN_MAX;
759 return rtnl_link_register(ops);
760}
761EXPORT_SYMBOL_GPL(ipvlan_link_register);
762
763static int ipvlan_device_event(struct notifier_block *unused,
764 unsigned long event, void *ptr)
765{
766 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
767 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
768 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
769 struct ipvl_dev *ipvlan, *next;
770 struct ipvl_port *port;
771 LIST_HEAD(lst_kill);
772 int err;
773
774 if (!netif_is_ipvlan_port(dev))
775 return NOTIFY_DONE;
776
777 port = ipvlan_port_get_rtnl(dev);
778
779 switch (event) {
780 case NETDEV_CHANGE:
781 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
782 netif_stacked_transfer_operstate(ipvlan->phy_dev,
783 ipvlan->dev);
784 break;
785
786 case NETDEV_REGISTER: {
787 struct net *oldnet, *newnet = dev_net(dev);
788 struct ipvlan_netns *old_vnet;
789
790 oldnet = read_pnet(&port->pnet);
791 if (net_eq(newnet, oldnet))
792 break;
793
794 write_pnet(&port->pnet, newnet);
795
796 old_vnet = net_generic(oldnet, ipvlan_netid);
797 if (!old_vnet->ipvl_nf_hook_refcnt)
798 break;
799
800 ipvlan_register_nf_hook(newnet);
801 ipvlan_unregister_nf_hook(oldnet);
802 break;
803 }
804 case NETDEV_UNREGISTER:
805 if (dev->reg_state != NETREG_UNREGISTERING)
806 break;
807
808 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
809 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
810 &lst_kill);
811 unregister_netdevice_many(&lst_kill);
812 break;
813
814 case NETDEV_FEAT_CHANGE:
815 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
816 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
817 ipvlan->dev->gso_max_size = dev->gso_max_size;
818 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
819 netdev_features_change(ipvlan->dev);
820 }
821 break;
822
823 case NETDEV_CHANGEMTU:
824 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
825 ipvlan_adjust_mtu(ipvlan, dev);
826 break;
827
828 case NETDEV_PRE_CHANGEADDR:
829 prechaddr_info = ptr;
830 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
831 err = dev_pre_changeaddr_notify(ipvlan->dev,
832 prechaddr_info->dev_addr,
833 extack);
834 if (err)
835 return notifier_from_errno(err);
836 }
837 break;
838
839 case NETDEV_CHANGEADDR:
840 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
841 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
842 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
843 }
844 break;
845
846 case NETDEV_PRE_TYPE_CHANGE:
847
848 return NOTIFY_BAD;
849 }
850 return NOTIFY_DONE;
851}
852
853
854static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
855{
856 struct ipvl_addr *addr;
857
858 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
859 if (!addr)
860 return -ENOMEM;
861
862 addr->master = ipvlan;
863 if (!is_v6) {
864 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
865 addr->atype = IPVL_IPV4;
866#if IS_ENABLED(CONFIG_IPV6)
867 } else {
868 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
869 addr->atype = IPVL_IPV6;
870#endif
871 }
872
873 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
874
875
876
877
878 if (netif_running(ipvlan->dev))
879 ipvlan_ht_addr_add(ipvlan, addr);
880
881 return 0;
882}
883
884static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
885{
886 struct ipvl_addr *addr;
887
888 spin_lock_bh(&ipvlan->addrs_lock);
889 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
890 if (!addr) {
891 spin_unlock_bh(&ipvlan->addrs_lock);
892 return;
893 }
894
895 ipvlan_ht_addr_del(addr);
896 list_del_rcu(&addr->anode);
897 spin_unlock_bh(&ipvlan->addrs_lock);
898 kfree_rcu(addr, rcu);
899}
900
901static bool ipvlan_is_valid_dev(const struct net_device *dev)
902{
903 struct ipvl_dev *ipvlan = netdev_priv(dev);
904
905 if (!netif_is_ipvlan(dev))
906 return false;
907
908 if (!ipvlan || !ipvlan->port)
909 return false;
910
911 return true;
912}
913
914#if IS_ENABLED(CONFIG_IPV6)
915static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
916{
917 int ret = -EINVAL;
918
919 spin_lock_bh(&ipvlan->addrs_lock);
920 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
921 netif_err(ipvlan, ifup, ipvlan->dev,
922 "Failed to add IPv6=%pI6c addr for %s intf\n",
923 ip6_addr, ipvlan->dev->name);
924 else
925 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
926 spin_unlock_bh(&ipvlan->addrs_lock);
927 return ret;
928}
929
930static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
931{
932 return ipvlan_del_addr(ipvlan, ip6_addr, true);
933}
934
935static int ipvlan_addr6_event(struct notifier_block *unused,
936 unsigned long event, void *ptr)
937{
938 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
939 struct net_device *dev = (struct net_device *)if6->idev->dev;
940 struct ipvl_dev *ipvlan = netdev_priv(dev);
941
942 if (!ipvlan_is_valid_dev(dev))
943 return NOTIFY_DONE;
944
945 switch (event) {
946 case NETDEV_UP:
947 if (ipvlan_add_addr6(ipvlan, &if6->addr))
948 return NOTIFY_BAD;
949 break;
950
951 case NETDEV_DOWN:
952 ipvlan_del_addr6(ipvlan, &if6->addr);
953 break;
954 }
955
956 return NOTIFY_OK;
957}
958
959static int ipvlan_addr6_validator_event(struct notifier_block *unused,
960 unsigned long event, void *ptr)
961{
962 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
963 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
964 struct ipvl_dev *ipvlan = netdev_priv(dev);
965
966 if (!ipvlan_is_valid_dev(dev))
967 return NOTIFY_DONE;
968
969 switch (event) {
970 case NETDEV_UP:
971 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
972 NL_SET_ERR_MSG(i6vi->extack,
973 "Address already assigned to an ipvlan device");
974 return notifier_from_errno(-EADDRINUSE);
975 }
976 break;
977 }
978
979 return NOTIFY_OK;
980}
981#endif
982
983static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
984{
985 int ret = -EINVAL;
986
987 spin_lock_bh(&ipvlan->addrs_lock);
988 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
989 netif_err(ipvlan, ifup, ipvlan->dev,
990 "Failed to add IPv4=%pI4 on %s intf.\n",
991 ip4_addr, ipvlan->dev->name);
992 else
993 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
994 spin_unlock_bh(&ipvlan->addrs_lock);
995 return ret;
996}
997
998static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
999{
1000 return ipvlan_del_addr(ipvlan, ip4_addr, false);
1001}
1002
1003static int ipvlan_addr4_event(struct notifier_block *unused,
1004 unsigned long event, void *ptr)
1005{
1006 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
1007 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
1008 struct ipvl_dev *ipvlan = netdev_priv(dev);
1009 struct in_addr ip4_addr;
1010
1011 if (!ipvlan_is_valid_dev(dev))
1012 return NOTIFY_DONE;
1013
1014 switch (event) {
1015 case NETDEV_UP:
1016 ip4_addr.s_addr = if4->ifa_address;
1017 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
1018 return NOTIFY_BAD;
1019 break;
1020
1021 case NETDEV_DOWN:
1022 ip4_addr.s_addr = if4->ifa_address;
1023 ipvlan_del_addr4(ipvlan, &ip4_addr);
1024 break;
1025 }
1026
1027 return NOTIFY_OK;
1028}
1029
1030static int ipvlan_addr4_validator_event(struct notifier_block *unused,
1031 unsigned long event, void *ptr)
1032{
1033 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
1034 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
1035 struct ipvl_dev *ipvlan = netdev_priv(dev);
1036
1037 if (!ipvlan_is_valid_dev(dev))
1038 return NOTIFY_DONE;
1039
1040 switch (event) {
1041 case NETDEV_UP:
1042 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
1043 NL_SET_ERR_MSG(ivi->extack,
1044 "Address already assigned to an ipvlan device");
1045 return notifier_from_errno(-EADDRINUSE);
1046 }
1047 break;
1048 }
1049
1050 return NOTIFY_OK;
1051}
1052
1053static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1054 .notifier_call = ipvlan_addr4_event,
1055};
1056
1057static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1058 .notifier_call = ipvlan_addr4_validator_event,
1059};
1060
1061static struct notifier_block ipvlan_notifier_block __read_mostly = {
1062 .notifier_call = ipvlan_device_event,
1063};
1064
1065#if IS_ENABLED(CONFIG_IPV6)
1066static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1067 .notifier_call = ipvlan_addr6_event,
1068};
1069
1070static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1071 .notifier_call = ipvlan_addr6_validator_event,
1072};
1073#endif
1074
1075static void ipvlan_ns_exit(struct net *net)
1076{
1077 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
1078
1079 if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
1080 vnet->ipvl_nf_hook_refcnt = 0;
1081 nf_unregister_net_hooks(net, ipvl_nfops,
1082 ARRAY_SIZE(ipvl_nfops));
1083 }
1084}
1085
1086static struct pernet_operations ipvlan_net_ops = {
1087 .id = &ipvlan_netid,
1088 .size = sizeof(struct ipvlan_netns),
1089 .exit = ipvlan_ns_exit,
1090};
1091
1092static int __init ipvlan_init_module(void)
1093{
1094 int err;
1095
1096 ipvlan_init_secret();
1097 register_netdevice_notifier(&ipvlan_notifier_block);
1098#if IS_ENABLED(CONFIG_IPV6)
1099 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1100 register_inet6addr_validator_notifier(
1101 &ipvlan_addr6_vtor_notifier_block);
1102#endif
1103 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1104 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1105
1106 err = register_pernet_subsys(&ipvlan_net_ops);
1107 if (err < 0)
1108 goto error;
1109
1110 err = ipvlan_link_register(&ipvlan_link_ops);
1111 if (err < 0) {
1112 unregister_pernet_subsys(&ipvlan_net_ops);
1113 goto error;
1114 }
1115
1116 return 0;
1117error:
1118 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1119 unregister_inetaddr_validator_notifier(
1120 &ipvlan_addr4_vtor_notifier_block);
1121#if IS_ENABLED(CONFIG_IPV6)
1122 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1123 unregister_inet6addr_validator_notifier(
1124 &ipvlan_addr6_vtor_notifier_block);
1125#endif
1126 unregister_netdevice_notifier(&ipvlan_notifier_block);
1127 return err;
1128}
1129
1130static void __exit ipvlan_cleanup_module(void)
1131{
1132 rtnl_link_unregister(&ipvlan_link_ops);
1133 unregister_pernet_subsys(&ipvlan_net_ops);
1134 unregister_netdevice_notifier(&ipvlan_notifier_block);
1135 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1136 unregister_inetaddr_validator_notifier(
1137 &ipvlan_addr4_vtor_notifier_block);
1138#if IS_ENABLED(CONFIG_IPV6)
1139 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1140 unregister_inet6addr_validator_notifier(
1141 &ipvlan_addr6_vtor_notifier_block);
1142#endif
1143}
1144
1145module_init(ipvlan_init_module);
1146module_exit(ipvlan_cleanup_module);
1147
1148MODULE_LICENSE("GPL");
1149MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1150MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1151MODULE_ALIAS_RTNL_LINK("ipvlan");
1152
