Loading...
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 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{
76 struct ipvl_dev *ipvlan;
77 struct net_device *mdev = port->dev;
78 int err = 0;
79
80 ASSERT_RTNL();
81 if (port->mode != nval) {
82 if (nval == IPVLAN_MODE_L3S) {
83 /* New mode is L3S */
84 err = ipvlan_register_nf_hook(read_pnet(&port->pnet));
85 if (!err) {
86 mdev->l3mdev_ops = &ipvl_l3mdev_ops;
87 mdev->priv_flags |= IFF_L3MDEV_MASTER;
88 } else
89 return err;
90 } else if (port->mode == IPVLAN_MODE_L3S) {
91 /* Old mode was L3S */
92 mdev->priv_flags &= ~IFF_L3MDEV_MASTER;
93 ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
94 mdev->l3mdev_ops = NULL;
95 }
96 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
97 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S)
98 ipvlan->dev->flags |= IFF_NOARP;
99 else
100 ipvlan->dev->flags &= ~IFF_NOARP;
101 }
102 port->mode = nval;
103 }
104 return err;
105}
106
107static int ipvlan_port_create(struct net_device *dev)
108{
109 struct ipvl_port *port;
110 int err, idx;
111
112 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
113 if (!port)
114 return -ENOMEM;
115
116 write_pnet(&port->pnet, dev_net(dev));
117 port->dev = dev;
118 port->mode = IPVLAN_MODE_L3;
119 INIT_LIST_HEAD(&port->ipvlans);
120 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
121 INIT_HLIST_HEAD(&port->hlhead[idx]);
122
123 skb_queue_head_init(&port->backlog);
124 INIT_WORK(&port->wq, ipvlan_process_multicast);
125 ida_init(&port->ida);
126 port->dev_id_start = 1;
127
128 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
129 if (err)
130 goto err;
131
132 return 0;
133
134err:
135 kfree(port);
136 return err;
137}
138
139static void ipvlan_port_destroy(struct net_device *dev)
140{
141 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
142 struct sk_buff *skb;
143
144 if (port->mode == IPVLAN_MODE_L3S) {
145 dev->priv_flags &= ~IFF_L3MDEV_MASTER;
146 ipvlan_unregister_nf_hook(dev_net(dev));
147 dev->l3mdev_ops = NULL;
148 }
149 netdev_rx_handler_unregister(dev);
150 cancel_work_sync(&port->wq);
151 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
152 if (skb->dev)
153 dev_put(skb->dev);
154 kfree_skb(skb);
155 }
156 ida_destroy(&port->ida);
157 kfree(port);
158}
159
160#define IPVLAN_FEATURES \
161 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
162 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
163 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
164 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
165
166#define IPVLAN_STATE_MASK \
167 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
168
169static int ipvlan_init(struct net_device *dev)
170{
171 struct ipvl_dev *ipvlan = netdev_priv(dev);
172 struct net_device *phy_dev = ipvlan->phy_dev;
173 struct ipvl_port *port;
174 int err;
175
176 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
177 (phy_dev->state & IPVLAN_STATE_MASK);
178 dev->features = phy_dev->features & IPVLAN_FEATURES;
179 dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
180 dev->gso_max_size = phy_dev->gso_max_size;
181 dev->gso_max_segs = phy_dev->gso_max_segs;
182 dev->hard_header_len = phy_dev->hard_header_len;
183
184 netdev_lockdep_set_classes(dev);
185
186 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
187 if (!ipvlan->pcpu_stats)
188 return -ENOMEM;
189
190 if (!netif_is_ipvlan_port(phy_dev)) {
191 err = ipvlan_port_create(phy_dev);
192 if (err < 0) {
193 free_percpu(ipvlan->pcpu_stats);
194 return err;
195 }
196 }
197 port = ipvlan_port_get_rtnl(phy_dev);
198 port->count += 1;
199 return 0;
200}
201
202static void ipvlan_uninit(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_port *port;
207
208 free_percpu(ipvlan->pcpu_stats);
209
210 port = ipvlan_port_get_rtnl(phy_dev);
211 port->count -= 1;
212 if (!port->count)
213 ipvlan_port_destroy(port->dev);
214}
215
216static 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 rcu_read_lock();
229 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
230 ipvlan_ht_addr_add(ipvlan, addr);
231 rcu_read_unlock();
232
233 return dev_uc_add(phy_dev, phy_dev->dev_addr);
234}
235
236static int ipvlan_stop(struct net_device *dev)
237{
238 struct ipvl_dev *ipvlan = netdev_priv(dev);
239 struct net_device *phy_dev = ipvlan->phy_dev;
240 struct ipvl_addr *addr;
241
242 dev_uc_unsync(phy_dev, dev);
243 dev_mc_unsync(phy_dev, dev);
244
245 dev_uc_del(phy_dev, phy_dev->dev_addr);
246
247 rcu_read_lock();
248 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
249 ipvlan_ht_addr_del(addr);
250 rcu_read_unlock();
251
252 return 0;
253}
254
255static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
256 struct net_device *dev)
257{
258 const struct ipvl_dev *ipvlan = netdev_priv(dev);
259 int skblen = skb->len;
260 int ret;
261
262 ret = ipvlan_queue_xmit(skb, dev);
263 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
264 struct ipvl_pcpu_stats *pcptr;
265
266 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
267
268 u64_stats_update_begin(&pcptr->syncp);
269 pcptr->tx_pkts++;
270 pcptr->tx_bytes += skblen;
271 u64_stats_update_end(&pcptr->syncp);
272 } else {
273 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
274 }
275 return ret;
276}
277
278static netdev_features_t ipvlan_fix_features(struct net_device *dev,
279 netdev_features_t features)
280{
281 struct ipvl_dev *ipvlan = netdev_priv(dev);
282
283 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
284}
285
286static void ipvlan_change_rx_flags(struct net_device *dev, int change)
287{
288 struct ipvl_dev *ipvlan = netdev_priv(dev);
289 struct net_device *phy_dev = ipvlan->phy_dev;
290
291 if (change & IFF_ALLMULTI)
292 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
293}
294
295static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
296{
297 struct ipvl_dev *ipvlan = netdev_priv(dev);
298
299 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
300 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
301 } else {
302 struct netdev_hw_addr *ha;
303 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
304
305 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
306 netdev_for_each_mc_addr(ha, dev)
307 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
308
309 /* Turn-on broadcast bit irrespective of address family,
310 * since broadcast is deferred to a work-queue, hence no
311 * impact on fast-path processing.
312 */
313 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
314
315 bitmap_copy(ipvlan->mac_filters, mc_filters,
316 IPVLAN_MAC_FILTER_SIZE);
317 }
318 dev_uc_sync(ipvlan->phy_dev, dev);
319 dev_mc_sync(ipvlan->phy_dev, dev);
320}
321
322static void ipvlan_get_stats64(struct net_device *dev,
323 struct rtnl_link_stats64 *s)
324{
325 struct ipvl_dev *ipvlan = netdev_priv(dev);
326
327 if (ipvlan->pcpu_stats) {
328 struct ipvl_pcpu_stats *pcptr;
329 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
330 u32 rx_errs = 0, tx_drps = 0;
331 u32 strt;
332 int idx;
333
334 for_each_possible_cpu(idx) {
335 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
336 do {
337 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
338 rx_pkts = pcptr->rx_pkts;
339 rx_bytes = pcptr->rx_bytes;
340 rx_mcast = pcptr->rx_mcast;
341 tx_pkts = pcptr->tx_pkts;
342 tx_bytes = pcptr->tx_bytes;
343 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
344 strt));
345
346 s->rx_packets += rx_pkts;
347 s->rx_bytes += rx_bytes;
348 s->multicast += rx_mcast;
349 s->tx_packets += tx_pkts;
350 s->tx_bytes += tx_bytes;
351
352 /* u32 values are updated without syncp protection. */
353 rx_errs += pcptr->rx_errs;
354 tx_drps += pcptr->tx_drps;
355 }
356 s->rx_errors = rx_errs;
357 s->rx_dropped = rx_errs;
358 s->tx_dropped = tx_drps;
359 }
360}
361
362static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
363{
364 struct ipvl_dev *ipvlan = netdev_priv(dev);
365 struct net_device *phy_dev = ipvlan->phy_dev;
366
367 return vlan_vid_add(phy_dev, proto, vid);
368}
369
370static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
371 u16 vid)
372{
373 struct ipvl_dev *ipvlan = netdev_priv(dev);
374 struct net_device *phy_dev = ipvlan->phy_dev;
375
376 vlan_vid_del(phy_dev, proto, vid);
377 return 0;
378}
379
380static int ipvlan_get_iflink(const struct net_device *dev)
381{
382 struct ipvl_dev *ipvlan = netdev_priv(dev);
383
384 return ipvlan->phy_dev->ifindex;
385}
386
387static const struct net_device_ops ipvlan_netdev_ops = {
388 .ndo_init = ipvlan_init,
389 .ndo_uninit = ipvlan_uninit,
390 .ndo_open = ipvlan_open,
391 .ndo_stop = ipvlan_stop,
392 .ndo_start_xmit = ipvlan_start_xmit,
393 .ndo_fix_features = ipvlan_fix_features,
394 .ndo_change_rx_flags = ipvlan_change_rx_flags,
395 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
396 .ndo_get_stats64 = ipvlan_get_stats64,
397 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
398 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
399 .ndo_get_iflink = ipvlan_get_iflink,
400};
401
402static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
403 unsigned short type, const void *daddr,
404 const void *saddr, unsigned len)
405{
406 const struct ipvl_dev *ipvlan = netdev_priv(dev);
407 struct net_device *phy_dev = ipvlan->phy_dev;
408
409 /* TODO Probably use a different field than dev_addr so that the
410 * mac-address on the virtual device is portable and can be carried
411 * while the packets use the mac-addr on the physical device.
412 */
413 return dev_hard_header(skb, phy_dev, type, daddr,
414 saddr ? : phy_dev->dev_addr, len);
415}
416
417static const struct header_ops ipvlan_header_ops = {
418 .create = ipvlan_hard_header,
419 .parse = eth_header_parse,
420 .cache = eth_header_cache,
421 .cache_update = eth_header_cache_update,
422};
423
424static bool netif_is_ipvlan(const struct net_device *dev)
425{
426 /* both ipvlan and ipvtap devices use the same netdev_ops */
427 return dev->netdev_ops == &ipvlan_netdev_ops;
428}
429
430static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
431 struct ethtool_link_ksettings *cmd)
432{
433 const struct ipvl_dev *ipvlan = netdev_priv(dev);
434
435 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
436}
437
438static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
439 struct ethtool_drvinfo *drvinfo)
440{
441 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
442 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
443}
444
445static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
446{
447 const struct ipvl_dev *ipvlan = netdev_priv(dev);
448
449 return ipvlan->msg_enable;
450}
451
452static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
453{
454 struct ipvl_dev *ipvlan = netdev_priv(dev);
455
456 ipvlan->msg_enable = value;
457}
458
459static const struct ethtool_ops ipvlan_ethtool_ops = {
460 .get_link = ethtool_op_get_link,
461 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
462 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
463 .get_msglevel = ipvlan_ethtool_get_msglevel,
464 .set_msglevel = ipvlan_ethtool_set_msglevel,
465};
466
467static int ipvlan_nl_changelink(struct net_device *dev,
468 struct nlattr *tb[], struct nlattr *data[],
469 struct netlink_ext_ack *extack)
470{
471 struct ipvl_dev *ipvlan = netdev_priv(dev);
472 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
473 int err = 0;
474
475 if (!data)
476 return 0;
477
478 if (data[IFLA_IPVLAN_MODE]) {
479 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
480
481 err = ipvlan_set_port_mode(port, nmode);
482 }
483
484 if (!err && data[IFLA_IPVLAN_FLAGS]) {
485 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
486
487 if (flags & IPVLAN_F_PRIVATE)
488 ipvlan_mark_private(port);
489 else
490 ipvlan_clear_private(port);
491
492 if (flags & IPVLAN_F_VEPA)
493 ipvlan_mark_vepa(port);
494 else
495 ipvlan_clear_vepa(port);
496 }
497
498 return err;
499}
500
501static size_t ipvlan_nl_getsize(const struct net_device *dev)
502{
503 return (0
504 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
505 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
506 );
507}
508
509static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
510 struct netlink_ext_ack *extack)
511{
512 if (!data)
513 return 0;
514
515 if (data[IFLA_IPVLAN_MODE]) {
516 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
517
518 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
519 return -EINVAL;
520 }
521 if (data[IFLA_IPVLAN_FLAGS]) {
522 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
523
524 /* Only two bits are used at this moment. */
525 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
526 return -EINVAL;
527 /* Also both flags can't be active at the same time. */
528 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
529 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
530 return -EINVAL;
531 }
532
533 return 0;
534}
535
536static int ipvlan_nl_fillinfo(struct sk_buff *skb,
537 const struct net_device *dev)
538{
539 struct ipvl_dev *ipvlan = netdev_priv(dev);
540 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
541 int ret = -EINVAL;
542
543 if (!port)
544 goto err;
545
546 ret = -EMSGSIZE;
547 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
548 goto err;
549 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
550 goto err;
551
552 return 0;
553
554err:
555 return ret;
556}
557
558int ipvlan_link_new(struct net *src_net, struct net_device *dev,
559 struct nlattr *tb[], struct nlattr *data[],
560 struct netlink_ext_ack *extack)
561{
562 struct ipvl_dev *ipvlan = netdev_priv(dev);
563 struct ipvl_port *port;
564 struct net_device *phy_dev;
565 int err;
566 u16 mode = IPVLAN_MODE_L3;
567
568 if (!tb[IFLA_LINK])
569 return -EINVAL;
570
571 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
572 if (!phy_dev)
573 return -ENODEV;
574
575 if (netif_is_ipvlan(phy_dev)) {
576 struct ipvl_dev *tmp = netdev_priv(phy_dev);
577
578 phy_dev = tmp->phy_dev;
579 } else if (!netif_is_ipvlan_port(phy_dev)) {
580 /* Exit early if the underlying link is invalid or busy */
581 if (phy_dev->type != ARPHRD_ETHER ||
582 phy_dev->flags & IFF_LOOPBACK) {
583 netdev_err(phy_dev,
584 "Master is either lo or non-ether device\n");
585 return -EINVAL;
586 }
587
588 if (netdev_is_rx_handler_busy(phy_dev)) {
589 netdev_err(phy_dev, "Device is already in use.\n");
590 return -EBUSY;
591 }
592 }
593
594 ipvlan->phy_dev = phy_dev;
595 ipvlan->dev = dev;
596 ipvlan->sfeatures = IPVLAN_FEATURES;
597 ipvlan_adjust_mtu(ipvlan, phy_dev);
598 INIT_LIST_HEAD(&ipvlan->addrs);
599 spin_lock_init(&ipvlan->addrs_lock);
600
601 /* TODO Probably put random address here to be presented to the
602 * world but keep using the physical-dev address for the outgoing
603 * packets.
604 */
605 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
606
607 dev->priv_flags |= IFF_NO_RX_HANDLER;
608
609 err = register_netdevice(dev);
610 if (err < 0)
611 return err;
612
613 /* ipvlan_init() would have created the port, if required */
614 port = ipvlan_port_get_rtnl(phy_dev);
615 ipvlan->port = port;
616
617 /* If the port-id base is at the MAX value, then wrap it around and
618 * begin from 0x1 again. This may be due to a busy system where lots
619 * of slaves are getting created and deleted.
620 */
621 if (port->dev_id_start == 0xFFFE)
622 port->dev_id_start = 0x1;
623
624 /* Since L2 address is shared among all IPvlan slaves including
625 * master, use unique 16 bit dev-ids to diffentiate among them.
626 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
627 * slave link [see addrconf_ifid_eui48()].
628 */
629 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
630 GFP_KERNEL);
631 if (err < 0)
632 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
633 GFP_KERNEL);
634 if (err < 0)
635 goto unregister_netdev;
636 dev->dev_id = err;
637
638 /* Increment id-base to the next slot for the future assignment */
639 port->dev_id_start = err + 1;
640
641 err = netdev_upper_dev_link(phy_dev, dev, extack);
642 if (err)
643 goto remove_ida;
644
645 /* Flags are per port and latest update overrides. User has
646 * to be consistent in setting it just like the mode attribute.
647 */
648 if (data && data[IFLA_IPVLAN_FLAGS])
649 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
650
651 if (data && data[IFLA_IPVLAN_MODE])
652 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
653
654 err = ipvlan_set_port_mode(port, mode);
655 if (err)
656 goto unlink_netdev;
657
658 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
659 netif_stacked_transfer_operstate(phy_dev, dev);
660 return 0;
661
662unlink_netdev:
663 netdev_upper_dev_unlink(phy_dev, dev);
664remove_ida:
665 ida_simple_remove(&port->ida, dev->dev_id);
666unregister_netdev:
667 unregister_netdevice(dev);
668 return err;
669}
670EXPORT_SYMBOL_GPL(ipvlan_link_new);
671
672void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
673{
674 struct ipvl_dev *ipvlan = netdev_priv(dev);
675 struct ipvl_addr *addr, *next;
676
677 spin_lock_bh(&ipvlan->addrs_lock);
678 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
679 ipvlan_ht_addr_del(addr);
680 list_del_rcu(&addr->anode);
681 kfree_rcu(addr, rcu);
682 }
683 spin_unlock_bh(&ipvlan->addrs_lock);
684
685 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
686 list_del_rcu(&ipvlan->pnode);
687 unregister_netdevice_queue(dev, head);
688 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
689}
690EXPORT_SYMBOL_GPL(ipvlan_link_delete);
691
692void ipvlan_link_setup(struct net_device *dev)
693{
694 ether_setup(dev);
695
696 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
697 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
698 dev->netdev_ops = &ipvlan_netdev_ops;
699 dev->needs_free_netdev = true;
700 dev->header_ops = &ipvlan_header_ops;
701 dev->ethtool_ops = &ipvlan_ethtool_ops;
702}
703EXPORT_SYMBOL_GPL(ipvlan_link_setup);
704
705static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
706{
707 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
708 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
709};
710
711static struct rtnl_link_ops ipvlan_link_ops = {
712 .kind = "ipvlan",
713 .priv_size = sizeof(struct ipvl_dev),
714
715 .setup = ipvlan_link_setup,
716 .newlink = ipvlan_link_new,
717 .dellink = ipvlan_link_delete,
718};
719
720int ipvlan_link_register(struct rtnl_link_ops *ops)
721{
722 ops->get_size = ipvlan_nl_getsize;
723 ops->policy = ipvlan_nl_policy;
724 ops->validate = ipvlan_nl_validate;
725 ops->fill_info = ipvlan_nl_fillinfo;
726 ops->changelink = ipvlan_nl_changelink;
727 ops->maxtype = IFLA_IPVLAN_MAX;
728 return rtnl_link_register(ops);
729}
730EXPORT_SYMBOL_GPL(ipvlan_link_register);
731
732static int ipvlan_device_event(struct notifier_block *unused,
733 unsigned long event, void *ptr)
734{
735 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
736 struct ipvl_dev *ipvlan, *next;
737 struct ipvl_port *port;
738 LIST_HEAD(lst_kill);
739
740 if (!netif_is_ipvlan_port(dev))
741 return NOTIFY_DONE;
742
743 port = ipvlan_port_get_rtnl(dev);
744
745 switch (event) {
746 case NETDEV_CHANGE:
747 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
748 netif_stacked_transfer_operstate(ipvlan->phy_dev,
749 ipvlan->dev);
750 break;
751
752 case NETDEV_REGISTER: {
753 struct net *oldnet, *newnet = dev_net(dev);
754 struct ipvlan_netns *old_vnet;
755
756 oldnet = read_pnet(&port->pnet);
757 if (net_eq(newnet, oldnet))
758 break;
759
760 write_pnet(&port->pnet, newnet);
761
762 old_vnet = net_generic(oldnet, ipvlan_netid);
763 if (!old_vnet->ipvl_nf_hook_refcnt)
764 break;
765
766 ipvlan_register_nf_hook(newnet);
767 ipvlan_unregister_nf_hook(oldnet);
768 break;
769 }
770 case NETDEV_UNREGISTER:
771 if (dev->reg_state != NETREG_UNREGISTERING)
772 break;
773
774 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
775 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
776 &lst_kill);
777 unregister_netdevice_many(&lst_kill);
778 break;
779
780 case NETDEV_FEAT_CHANGE:
781 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
782 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
783 ipvlan->dev->gso_max_size = dev->gso_max_size;
784 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
785 netdev_features_change(ipvlan->dev);
786 }
787 break;
788
789 case NETDEV_CHANGEMTU:
790 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
791 ipvlan_adjust_mtu(ipvlan, dev);
792 break;
793
794 case NETDEV_CHANGEADDR:
795 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
796 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
797 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
798 }
799 break;
800
801 case NETDEV_PRE_TYPE_CHANGE:
802 /* Forbid underlying device to change its type. */
803 return NOTIFY_BAD;
804 }
805 return NOTIFY_DONE;
806}
807
808/* the caller must held the addrs lock */
809static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
810{
811 struct ipvl_addr *addr;
812
813 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
814 if (!addr)
815 return -ENOMEM;
816
817 addr->master = ipvlan;
818 if (!is_v6) {
819 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
820 addr->atype = IPVL_IPV4;
821#if IS_ENABLED(CONFIG_IPV6)
822 } else {
823 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
824 addr->atype = IPVL_IPV6;
825#endif
826 }
827
828 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
829
830 /* If the interface is not up, the address will be added to the hash
831 * list by ipvlan_open.
832 */
833 if (netif_running(ipvlan->dev))
834 ipvlan_ht_addr_add(ipvlan, addr);
835
836 return 0;
837}
838
839static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
840{
841 struct ipvl_addr *addr;
842
843 spin_lock_bh(&ipvlan->addrs_lock);
844 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
845 if (!addr) {
846 spin_unlock_bh(&ipvlan->addrs_lock);
847 return;
848 }
849
850 ipvlan_ht_addr_del(addr);
851 list_del_rcu(&addr->anode);
852 spin_unlock_bh(&ipvlan->addrs_lock);
853 kfree_rcu(addr, rcu);
854}
855
856static bool ipvlan_is_valid_dev(const struct net_device *dev)
857{
858 struct ipvl_dev *ipvlan = netdev_priv(dev);
859
860 if (!netif_is_ipvlan(dev))
861 return false;
862
863 if (!ipvlan || !ipvlan->port)
864 return false;
865
866 return true;
867}
868
869#if IS_ENABLED(CONFIG_IPV6)
870static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
871{
872 int ret = -EINVAL;
873
874 spin_lock_bh(&ipvlan->addrs_lock);
875 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
876 netif_err(ipvlan, ifup, ipvlan->dev,
877 "Failed to add IPv6=%pI6c addr for %s intf\n",
878 ip6_addr, ipvlan->dev->name);
879 else
880 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
881 spin_unlock_bh(&ipvlan->addrs_lock);
882 return ret;
883}
884
885static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
886{
887 return ipvlan_del_addr(ipvlan, ip6_addr, true);
888}
889
890static int ipvlan_addr6_event(struct notifier_block *unused,
891 unsigned long event, void *ptr)
892{
893 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
894 struct net_device *dev = (struct net_device *)if6->idev->dev;
895 struct ipvl_dev *ipvlan = netdev_priv(dev);
896
897 if (!ipvlan_is_valid_dev(dev))
898 return NOTIFY_DONE;
899
900 switch (event) {
901 case NETDEV_UP:
902 if (ipvlan_add_addr6(ipvlan, &if6->addr))
903 return NOTIFY_BAD;
904 break;
905
906 case NETDEV_DOWN:
907 ipvlan_del_addr6(ipvlan, &if6->addr);
908 break;
909 }
910
911 return NOTIFY_OK;
912}
913
914static int ipvlan_addr6_validator_event(struct notifier_block *unused,
915 unsigned long event, void *ptr)
916{
917 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
918 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
919 struct ipvl_dev *ipvlan = netdev_priv(dev);
920
921 if (!ipvlan_is_valid_dev(dev))
922 return NOTIFY_DONE;
923
924 switch (event) {
925 case NETDEV_UP:
926 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
927 NL_SET_ERR_MSG(i6vi->extack,
928 "Address already assigned to an ipvlan device");
929 return notifier_from_errno(-EADDRINUSE);
930 }
931 break;
932 }
933
934 return NOTIFY_OK;
935}
936#endif
937
938static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
939{
940 int ret = -EINVAL;
941
942 spin_lock_bh(&ipvlan->addrs_lock);
943 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
944 netif_err(ipvlan, ifup, ipvlan->dev,
945 "Failed to add IPv4=%pI4 on %s intf.\n",
946 ip4_addr, ipvlan->dev->name);
947 else
948 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
949 spin_unlock_bh(&ipvlan->addrs_lock);
950 return ret;
951}
952
953static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
954{
955 return ipvlan_del_addr(ipvlan, ip4_addr, false);
956}
957
958static int ipvlan_addr4_event(struct notifier_block *unused,
959 unsigned long event, void *ptr)
960{
961 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
962 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
963 struct ipvl_dev *ipvlan = netdev_priv(dev);
964 struct in_addr ip4_addr;
965
966 if (!ipvlan_is_valid_dev(dev))
967 return NOTIFY_DONE;
968
969 switch (event) {
970 case NETDEV_UP:
971 ip4_addr.s_addr = if4->ifa_address;
972 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
973 return NOTIFY_BAD;
974 break;
975
976 case NETDEV_DOWN:
977 ip4_addr.s_addr = if4->ifa_address;
978 ipvlan_del_addr4(ipvlan, &ip4_addr);
979 break;
980 }
981
982 return NOTIFY_OK;
983}
984
985static int ipvlan_addr4_validator_event(struct notifier_block *unused,
986 unsigned long event, void *ptr)
987{
988 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
989 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
990 struct ipvl_dev *ipvlan = netdev_priv(dev);
991
992 if (!ipvlan_is_valid_dev(dev))
993 return NOTIFY_DONE;
994
995 switch (event) {
996 case NETDEV_UP:
997 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
998 NL_SET_ERR_MSG(ivi->extack,
999 "Address already assigned to an ipvlan device");
1000 return notifier_from_errno(-EADDRINUSE);
1001 }
1002 break;
1003 }
1004
1005 return NOTIFY_OK;
1006}
1007
1008static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1009 .notifier_call = ipvlan_addr4_event,
1010};
1011
1012static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1013 .notifier_call = ipvlan_addr4_validator_event,
1014};
1015
1016static struct notifier_block ipvlan_notifier_block __read_mostly = {
1017 .notifier_call = ipvlan_device_event,
1018};
1019
1020#if IS_ENABLED(CONFIG_IPV6)
1021static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1022 .notifier_call = ipvlan_addr6_event,
1023};
1024
1025static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1026 .notifier_call = ipvlan_addr6_validator_event,
1027};
1028#endif
1029
1030static void ipvlan_ns_exit(struct net *net)
1031{
1032 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
1033
1034 if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
1035 vnet->ipvl_nf_hook_refcnt = 0;
1036 nf_unregister_net_hooks(net, ipvl_nfops,
1037 ARRAY_SIZE(ipvl_nfops));
1038 }
1039}
1040
1041static struct pernet_operations ipvlan_net_ops = {
1042 .id = &ipvlan_netid,
1043 .size = sizeof(struct ipvlan_netns),
1044 .exit = ipvlan_ns_exit,
1045};
1046
1047static int __init ipvlan_init_module(void)
1048{
1049 int err;
1050
1051 ipvlan_init_secret();
1052 register_netdevice_notifier(&ipvlan_notifier_block);
1053#if IS_ENABLED(CONFIG_IPV6)
1054 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1055 register_inet6addr_validator_notifier(
1056 &ipvlan_addr6_vtor_notifier_block);
1057#endif
1058 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1059 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1060
1061 err = register_pernet_subsys(&ipvlan_net_ops);
1062 if (err < 0)
1063 goto error;
1064
1065 err = ipvlan_link_register(&ipvlan_link_ops);
1066 if (err < 0) {
1067 unregister_pernet_subsys(&ipvlan_net_ops);
1068 goto error;
1069 }
1070
1071 return 0;
1072error:
1073 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1074 unregister_inetaddr_validator_notifier(
1075 &ipvlan_addr4_vtor_notifier_block);
1076#if IS_ENABLED(CONFIG_IPV6)
1077 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1078 unregister_inet6addr_validator_notifier(
1079 &ipvlan_addr6_vtor_notifier_block);
1080#endif
1081 unregister_netdevice_notifier(&ipvlan_notifier_block);
1082 return err;
1083}
1084
1085static void __exit ipvlan_cleanup_module(void)
1086{
1087 rtnl_link_unregister(&ipvlan_link_ops);
1088 unregister_pernet_subsys(&ipvlan_net_ops);
1089 unregister_netdevice_notifier(&ipvlan_notifier_block);
1090 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1091 unregister_inetaddr_validator_notifier(
1092 &ipvlan_addr4_vtor_notifier_block);
1093#if IS_ENABLED(CONFIG_IPV6)
1094 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1095 unregister_inet6addr_validator_notifier(
1096 &ipvlan_addr6_vtor_notifier_block);
1097#endif
1098}
1099
1100module_init(ipvlan_init_module);
1101module_exit(ipvlan_cleanup_module);
1102
1103MODULE_LICENSE("GPL");
1104MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1105MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1106MODULE_ALIAS_RTNL_LINK("ipvlan");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
3 */
4
5#include "ipvlan.h"
6
7static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
8 struct netlink_ext_ack *extack)
9{
10 struct ipvl_dev *ipvlan;
11 unsigned int flags;
12 int err;
13
14 ASSERT_RTNL();
15 if (port->mode != nval) {
16 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
17 flags = ipvlan->dev->flags;
18 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
19 err = dev_change_flags(ipvlan->dev,
20 flags | IFF_NOARP,
21 extack);
22 } else {
23 err = dev_change_flags(ipvlan->dev,
24 flags & ~IFF_NOARP,
25 extack);
26 }
27 if (unlikely(err))
28 goto fail;
29 }
30 if (nval == IPVLAN_MODE_L3S) {
31 /* New mode is L3S */
32 err = ipvlan_l3s_register(port);
33 if (err)
34 goto fail;
35 } else if (port->mode == IPVLAN_MODE_L3S) {
36 /* Old mode was L3S */
37 ipvlan_l3s_unregister(port);
38 }
39 port->mode = nval;
40 }
41 return 0;
42
43fail:
44 /* Undo the flags changes that have been done so far. */
45 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
46 flags = ipvlan->dev->flags;
47 if (port->mode == IPVLAN_MODE_L3 ||
48 port->mode == IPVLAN_MODE_L3S)
49 dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
50 NULL);
51 else
52 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
53 NULL);
54 }
55
56 return err;
57}
58
59static int ipvlan_port_create(struct net_device *dev)
60{
61 struct ipvl_port *port;
62 int err, idx;
63
64 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
65 if (!port)
66 return -ENOMEM;
67
68 write_pnet(&port->pnet, dev_net(dev));
69 port->dev = dev;
70 port->mode = IPVLAN_MODE_L3;
71 INIT_LIST_HEAD(&port->ipvlans);
72 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
73 INIT_HLIST_HEAD(&port->hlhead[idx]);
74
75 skb_queue_head_init(&port->backlog);
76 INIT_WORK(&port->wq, ipvlan_process_multicast);
77 ida_init(&port->ida);
78 port->dev_id_start = 1;
79
80 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
81 if (err)
82 goto err;
83
84 return 0;
85
86err:
87 kfree(port);
88 return err;
89}
90
91static void ipvlan_port_destroy(struct net_device *dev)
92{
93 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
94 struct sk_buff *skb;
95
96 if (port->mode == IPVLAN_MODE_L3S)
97 ipvlan_l3s_unregister(port);
98 netdev_rx_handler_unregister(dev);
99 cancel_work_sync(&port->wq);
100 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
101 if (skb->dev)
102 dev_put(skb->dev);
103 kfree_skb(skb);
104 }
105 ida_destroy(&port->ida);
106 kfree(port);
107}
108
109#define IPVLAN_ALWAYS_ON_OFLOADS \
110 (NETIF_F_SG | NETIF_F_HW_CSUM | \
111 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
112
113#define IPVLAN_ALWAYS_ON \
114 (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED)
115
116#define IPVLAN_FEATURES \
117 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
118 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
119 NETIF_F_GRO | NETIF_F_RXCSUM | \
120 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
121
122 /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
123
124#define IPVLAN_STATE_MASK \
125 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
126
127static int ipvlan_init(struct net_device *dev)
128{
129 struct ipvl_dev *ipvlan = netdev_priv(dev);
130 struct net_device *phy_dev = ipvlan->phy_dev;
131 struct ipvl_port *port;
132 int err;
133
134 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
135 (phy_dev->state & IPVLAN_STATE_MASK);
136 dev->features = phy_dev->features & IPVLAN_FEATURES;
137 dev->features |= IPVLAN_ALWAYS_ON;
138 dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
139 dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
140 dev->hw_enc_features |= dev->features;
141 dev->gso_max_size = phy_dev->gso_max_size;
142 dev->gso_max_segs = phy_dev->gso_max_segs;
143 dev->hard_header_len = phy_dev->hard_header_len;
144
145 netdev_lockdep_set_classes(dev);
146
147 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
148 if (!ipvlan->pcpu_stats)
149 return -ENOMEM;
150
151 if (!netif_is_ipvlan_port(phy_dev)) {
152 err = ipvlan_port_create(phy_dev);
153 if (err < 0) {
154 free_percpu(ipvlan->pcpu_stats);
155 return err;
156 }
157 }
158 port = ipvlan_port_get_rtnl(phy_dev);
159 port->count += 1;
160 return 0;
161}
162
163static void ipvlan_uninit(struct net_device *dev)
164{
165 struct ipvl_dev *ipvlan = netdev_priv(dev);
166 struct net_device *phy_dev = ipvlan->phy_dev;
167 struct ipvl_port *port;
168
169 free_percpu(ipvlan->pcpu_stats);
170
171 port = ipvlan_port_get_rtnl(phy_dev);
172 port->count -= 1;
173 if (!port->count)
174 ipvlan_port_destroy(port->dev);
175}
176
177static int ipvlan_open(struct net_device *dev)
178{
179 struct ipvl_dev *ipvlan = netdev_priv(dev);
180 struct ipvl_addr *addr;
181
182 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
183 ipvlan->port->mode == IPVLAN_MODE_L3S)
184 dev->flags |= IFF_NOARP;
185 else
186 dev->flags &= ~IFF_NOARP;
187
188 rcu_read_lock();
189 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
190 ipvlan_ht_addr_add(ipvlan, addr);
191 rcu_read_unlock();
192
193 return 0;
194}
195
196static int ipvlan_stop(struct net_device *dev)
197{
198 struct ipvl_dev *ipvlan = netdev_priv(dev);
199 struct net_device *phy_dev = ipvlan->phy_dev;
200 struct ipvl_addr *addr;
201
202 dev_uc_unsync(phy_dev, dev);
203 dev_mc_unsync(phy_dev, dev);
204
205 rcu_read_lock();
206 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
207 ipvlan_ht_addr_del(addr);
208 rcu_read_unlock();
209
210 return 0;
211}
212
213static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
214 struct net_device *dev)
215{
216 const struct ipvl_dev *ipvlan = netdev_priv(dev);
217 int skblen = skb->len;
218 int ret;
219
220 ret = ipvlan_queue_xmit(skb, dev);
221 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
222 struct ipvl_pcpu_stats *pcptr;
223
224 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
225
226 u64_stats_update_begin(&pcptr->syncp);
227 pcptr->tx_pkts++;
228 pcptr->tx_bytes += skblen;
229 u64_stats_update_end(&pcptr->syncp);
230 } else {
231 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
232 }
233 return ret;
234}
235
236static netdev_features_t ipvlan_fix_features(struct net_device *dev,
237 netdev_features_t features)
238{
239 struct ipvl_dev *ipvlan = netdev_priv(dev);
240
241 features |= NETIF_F_ALL_FOR_ALL;
242 features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES);
243 features = netdev_increment_features(ipvlan->phy_dev->features,
244 features, features);
245 features |= IPVLAN_ALWAYS_ON;
246 features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON);
247
248 return features;
249}
250
251static void ipvlan_change_rx_flags(struct net_device *dev, int change)
252{
253 struct ipvl_dev *ipvlan = netdev_priv(dev);
254 struct net_device *phy_dev = ipvlan->phy_dev;
255
256 if (change & IFF_ALLMULTI)
257 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
258}
259
260static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
261{
262 struct ipvl_dev *ipvlan = netdev_priv(dev);
263
264 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
265 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
266 } else {
267 struct netdev_hw_addr *ha;
268 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
269
270 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
271 netdev_for_each_mc_addr(ha, dev)
272 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
273
274 /* Turn-on broadcast bit irrespective of address family,
275 * since broadcast is deferred to a work-queue, hence no
276 * impact on fast-path processing.
277 */
278 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
279
280 bitmap_copy(ipvlan->mac_filters, mc_filters,
281 IPVLAN_MAC_FILTER_SIZE);
282 }
283 dev_uc_sync(ipvlan->phy_dev, dev);
284 dev_mc_sync(ipvlan->phy_dev, dev);
285}
286
287static void ipvlan_get_stats64(struct net_device *dev,
288 struct rtnl_link_stats64 *s)
289{
290 struct ipvl_dev *ipvlan = netdev_priv(dev);
291
292 if (ipvlan->pcpu_stats) {
293 struct ipvl_pcpu_stats *pcptr;
294 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
295 u32 rx_errs = 0, tx_drps = 0;
296 u32 strt;
297 int idx;
298
299 for_each_possible_cpu(idx) {
300 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
301 do {
302 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
303 rx_pkts = pcptr->rx_pkts;
304 rx_bytes = pcptr->rx_bytes;
305 rx_mcast = pcptr->rx_mcast;
306 tx_pkts = pcptr->tx_pkts;
307 tx_bytes = pcptr->tx_bytes;
308 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
309 strt));
310
311 s->rx_packets += rx_pkts;
312 s->rx_bytes += rx_bytes;
313 s->multicast += rx_mcast;
314 s->tx_packets += tx_pkts;
315 s->tx_bytes += tx_bytes;
316
317 /* u32 values are updated without syncp protection. */
318 rx_errs += pcptr->rx_errs;
319 tx_drps += pcptr->tx_drps;
320 }
321 s->rx_errors = rx_errs;
322 s->rx_dropped = rx_errs;
323 s->tx_dropped = tx_drps;
324 }
325}
326
327static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
328{
329 struct ipvl_dev *ipvlan = netdev_priv(dev);
330 struct net_device *phy_dev = ipvlan->phy_dev;
331
332 return vlan_vid_add(phy_dev, proto, vid);
333}
334
335static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
336 u16 vid)
337{
338 struct ipvl_dev *ipvlan = netdev_priv(dev);
339 struct net_device *phy_dev = ipvlan->phy_dev;
340
341 vlan_vid_del(phy_dev, proto, vid);
342 return 0;
343}
344
345static int ipvlan_get_iflink(const struct net_device *dev)
346{
347 struct ipvl_dev *ipvlan = netdev_priv(dev);
348
349 return ipvlan->phy_dev->ifindex;
350}
351
352static const struct net_device_ops ipvlan_netdev_ops = {
353 .ndo_init = ipvlan_init,
354 .ndo_uninit = ipvlan_uninit,
355 .ndo_open = ipvlan_open,
356 .ndo_stop = ipvlan_stop,
357 .ndo_start_xmit = ipvlan_start_xmit,
358 .ndo_fix_features = ipvlan_fix_features,
359 .ndo_change_rx_flags = ipvlan_change_rx_flags,
360 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
361 .ndo_get_stats64 = ipvlan_get_stats64,
362 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
363 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
364 .ndo_get_iflink = ipvlan_get_iflink,
365};
366
367static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
368 unsigned short type, const void *daddr,
369 const void *saddr, unsigned len)
370{
371 const struct ipvl_dev *ipvlan = netdev_priv(dev);
372 struct net_device *phy_dev = ipvlan->phy_dev;
373
374 /* TODO Probably use a different field than dev_addr so that the
375 * mac-address on the virtual device is portable and can be carried
376 * while the packets use the mac-addr on the physical device.
377 */
378 return dev_hard_header(skb, phy_dev, type, daddr,
379 saddr ? : phy_dev->dev_addr, len);
380}
381
382static const struct header_ops ipvlan_header_ops = {
383 .create = ipvlan_hard_header,
384 .parse = eth_header_parse,
385 .cache = eth_header_cache,
386 .cache_update = eth_header_cache_update,
387};
388
389static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
390{
391 ipvlan->dev->mtu = dev->mtu;
392}
393
394static bool netif_is_ipvlan(const struct net_device *dev)
395{
396 /* both ipvlan and ipvtap devices use the same netdev_ops */
397 return dev->netdev_ops == &ipvlan_netdev_ops;
398}
399
400static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
401 struct ethtool_link_ksettings *cmd)
402{
403 const struct ipvl_dev *ipvlan = netdev_priv(dev);
404
405 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
406}
407
408static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
409 struct ethtool_drvinfo *drvinfo)
410{
411 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
412 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
413}
414
415static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
416{
417 const struct ipvl_dev *ipvlan = netdev_priv(dev);
418
419 return ipvlan->msg_enable;
420}
421
422static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
423{
424 struct ipvl_dev *ipvlan = netdev_priv(dev);
425
426 ipvlan->msg_enable = value;
427}
428
429static const struct ethtool_ops ipvlan_ethtool_ops = {
430 .get_link = ethtool_op_get_link,
431 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
432 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
433 .get_msglevel = ipvlan_ethtool_get_msglevel,
434 .set_msglevel = ipvlan_ethtool_set_msglevel,
435};
436
437static int ipvlan_nl_changelink(struct net_device *dev,
438 struct nlattr *tb[], struct nlattr *data[],
439 struct netlink_ext_ack *extack)
440{
441 struct ipvl_dev *ipvlan = netdev_priv(dev);
442 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
443 int err = 0;
444
445 if (!data)
446 return 0;
447 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
448 return -EPERM;
449
450 if (data[IFLA_IPVLAN_MODE]) {
451 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
452
453 err = ipvlan_set_port_mode(port, nmode, extack);
454 }
455
456 if (!err && data[IFLA_IPVLAN_FLAGS]) {
457 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
458
459 if (flags & IPVLAN_F_PRIVATE)
460 ipvlan_mark_private(port);
461 else
462 ipvlan_clear_private(port);
463
464 if (flags & IPVLAN_F_VEPA)
465 ipvlan_mark_vepa(port);
466 else
467 ipvlan_clear_vepa(port);
468 }
469
470 return err;
471}
472
473static size_t ipvlan_nl_getsize(const struct net_device *dev)
474{
475 return (0
476 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
477 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
478 );
479}
480
481static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
482 struct netlink_ext_ack *extack)
483{
484 if (!data)
485 return 0;
486
487 if (data[IFLA_IPVLAN_MODE]) {
488 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
489
490 if (mode >= IPVLAN_MODE_MAX)
491 return -EINVAL;
492 }
493 if (data[IFLA_IPVLAN_FLAGS]) {
494 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
495
496 /* Only two bits are used at this moment. */
497 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
498 return -EINVAL;
499 /* Also both flags can't be active at the same time. */
500 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
501 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
502 return -EINVAL;
503 }
504
505 return 0;
506}
507
508static int ipvlan_nl_fillinfo(struct sk_buff *skb,
509 const struct net_device *dev)
510{
511 struct ipvl_dev *ipvlan = netdev_priv(dev);
512 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
513 int ret = -EINVAL;
514
515 if (!port)
516 goto err;
517
518 ret = -EMSGSIZE;
519 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
520 goto err;
521 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
522 goto err;
523
524 return 0;
525
526err:
527 return ret;
528}
529
530int ipvlan_link_new(struct net *src_net, struct net_device *dev,
531 struct nlattr *tb[], struct nlattr *data[],
532 struct netlink_ext_ack *extack)
533{
534 struct ipvl_dev *ipvlan = netdev_priv(dev);
535 struct ipvl_port *port;
536 struct net_device *phy_dev;
537 int err;
538 u16 mode = IPVLAN_MODE_L3;
539
540 if (!tb[IFLA_LINK])
541 return -EINVAL;
542
543 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
544 if (!phy_dev)
545 return -ENODEV;
546
547 if (netif_is_ipvlan(phy_dev)) {
548 struct ipvl_dev *tmp = netdev_priv(phy_dev);
549
550 phy_dev = tmp->phy_dev;
551 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
552 return -EPERM;
553 } else if (!netif_is_ipvlan_port(phy_dev)) {
554 /* Exit early if the underlying link is invalid or busy */
555 if (phy_dev->type != ARPHRD_ETHER ||
556 phy_dev->flags & IFF_LOOPBACK) {
557 netdev_err(phy_dev,
558 "Master is either lo or non-ether device\n");
559 return -EINVAL;
560 }
561
562 if (netdev_is_rx_handler_busy(phy_dev)) {
563 netdev_err(phy_dev, "Device is already in use.\n");
564 return -EBUSY;
565 }
566 }
567
568 ipvlan->phy_dev = phy_dev;
569 ipvlan->dev = dev;
570 ipvlan->sfeatures = IPVLAN_FEATURES;
571 if (!tb[IFLA_MTU])
572 ipvlan_adjust_mtu(ipvlan, phy_dev);
573 INIT_LIST_HEAD(&ipvlan->addrs);
574 spin_lock_init(&ipvlan->addrs_lock);
575
576 /* TODO Probably put random address here to be presented to the
577 * world but keep using the physical-dev address for the outgoing
578 * packets.
579 */
580 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
581
582 dev->priv_flags |= IFF_NO_RX_HANDLER;
583
584 err = register_netdevice(dev);
585 if (err < 0)
586 return err;
587
588 /* ipvlan_init() would have created the port, if required */
589 port = ipvlan_port_get_rtnl(phy_dev);
590 ipvlan->port = port;
591
592 /* If the port-id base is at the MAX value, then wrap it around and
593 * begin from 0x1 again. This may be due to a busy system where lots
594 * of slaves are getting created and deleted.
595 */
596 if (port->dev_id_start == 0xFFFE)
597 port->dev_id_start = 0x1;
598
599 /* Since L2 address is shared among all IPvlan slaves including
600 * master, use unique 16 bit dev-ids to diffentiate among them.
601 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
602 * slave link [see addrconf_ifid_eui48()].
603 */
604 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
605 GFP_KERNEL);
606 if (err < 0)
607 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
608 GFP_KERNEL);
609 if (err < 0)
610 goto unregister_netdev;
611 dev->dev_id = err;
612
613 /* Increment id-base to the next slot for the future assignment */
614 port->dev_id_start = err + 1;
615
616 err = netdev_upper_dev_link(phy_dev, dev, extack);
617 if (err)
618 goto remove_ida;
619
620 /* Flags are per port and latest update overrides. User has
621 * to be consistent in setting it just like the mode attribute.
622 */
623 if (data && data[IFLA_IPVLAN_FLAGS])
624 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
625
626 if (data && data[IFLA_IPVLAN_MODE])
627 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
628
629 err = ipvlan_set_port_mode(port, mode, extack);
630 if (err)
631 goto unlink_netdev;
632
633 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
634 netif_stacked_transfer_operstate(phy_dev, dev);
635 return 0;
636
637unlink_netdev:
638 netdev_upper_dev_unlink(phy_dev, dev);
639remove_ida:
640 ida_simple_remove(&port->ida, dev->dev_id);
641unregister_netdev:
642 unregister_netdevice(dev);
643 return err;
644}
645EXPORT_SYMBOL_GPL(ipvlan_link_new);
646
647void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
648{
649 struct ipvl_dev *ipvlan = netdev_priv(dev);
650 struct ipvl_addr *addr, *next;
651
652 spin_lock_bh(&ipvlan->addrs_lock);
653 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
654 ipvlan_ht_addr_del(addr);
655 list_del_rcu(&addr->anode);
656 kfree_rcu(addr, rcu);
657 }
658 spin_unlock_bh(&ipvlan->addrs_lock);
659
660 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
661 list_del_rcu(&ipvlan->pnode);
662 unregister_netdevice_queue(dev, head);
663 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
664}
665EXPORT_SYMBOL_GPL(ipvlan_link_delete);
666
667void ipvlan_link_setup(struct net_device *dev)
668{
669 ether_setup(dev);
670
671 dev->max_mtu = ETH_MAX_MTU;
672 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
673 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
674 dev->netdev_ops = &ipvlan_netdev_ops;
675 dev->needs_free_netdev = true;
676 dev->header_ops = &ipvlan_header_ops;
677 dev->ethtool_ops = &ipvlan_ethtool_ops;
678}
679EXPORT_SYMBOL_GPL(ipvlan_link_setup);
680
681static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
682{
683 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
684 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
685};
686
687static struct rtnl_link_ops ipvlan_link_ops = {
688 .kind = "ipvlan",
689 .priv_size = sizeof(struct ipvl_dev),
690
691 .setup = ipvlan_link_setup,
692 .newlink = ipvlan_link_new,
693 .dellink = ipvlan_link_delete,
694};
695
696int ipvlan_link_register(struct rtnl_link_ops *ops)
697{
698 ops->get_size = ipvlan_nl_getsize;
699 ops->policy = ipvlan_nl_policy;
700 ops->validate = ipvlan_nl_validate;
701 ops->fill_info = ipvlan_nl_fillinfo;
702 ops->changelink = ipvlan_nl_changelink;
703 ops->maxtype = IFLA_IPVLAN_MAX;
704 return rtnl_link_register(ops);
705}
706EXPORT_SYMBOL_GPL(ipvlan_link_register);
707
708static int ipvlan_device_event(struct notifier_block *unused,
709 unsigned long event, void *ptr)
710{
711 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
712 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
713 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
714 struct ipvl_dev *ipvlan, *next;
715 struct ipvl_port *port;
716 LIST_HEAD(lst_kill);
717 int err;
718
719 if (!netif_is_ipvlan_port(dev))
720 return NOTIFY_DONE;
721
722 port = ipvlan_port_get_rtnl(dev);
723
724 switch (event) {
725 case NETDEV_CHANGE:
726 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
727 netif_stacked_transfer_operstate(ipvlan->phy_dev,
728 ipvlan->dev);
729 break;
730
731 case NETDEV_REGISTER: {
732 struct net *oldnet, *newnet = dev_net(dev);
733
734 oldnet = read_pnet(&port->pnet);
735 if (net_eq(newnet, oldnet))
736 break;
737
738 write_pnet(&port->pnet, newnet);
739
740 ipvlan_migrate_l3s_hook(oldnet, newnet);
741 break;
742 }
743 case NETDEV_UNREGISTER:
744 if (dev->reg_state != NETREG_UNREGISTERING)
745 break;
746
747 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
748 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
749 &lst_kill);
750 unregister_netdevice_many(&lst_kill);
751 break;
752
753 case NETDEV_FEAT_CHANGE:
754 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
755 ipvlan->dev->gso_max_size = dev->gso_max_size;
756 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
757 netdev_update_features(ipvlan->dev);
758 }
759 break;
760
761 case NETDEV_CHANGEMTU:
762 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
763 ipvlan_adjust_mtu(ipvlan, dev);
764 break;
765
766 case NETDEV_PRE_CHANGEADDR:
767 prechaddr_info = ptr;
768 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
769 err = dev_pre_changeaddr_notify(ipvlan->dev,
770 prechaddr_info->dev_addr,
771 extack);
772 if (err)
773 return notifier_from_errno(err);
774 }
775 break;
776
777 case NETDEV_CHANGEADDR:
778 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
779 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
780 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
781 }
782 break;
783
784 case NETDEV_PRE_TYPE_CHANGE:
785 /* Forbid underlying device to change its type. */
786 return NOTIFY_BAD;
787 }
788 return NOTIFY_DONE;
789}
790
791/* the caller must held the addrs lock */
792static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
793{
794 struct ipvl_addr *addr;
795
796 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
797 if (!addr)
798 return -ENOMEM;
799
800 addr->master = ipvlan;
801 if (!is_v6) {
802 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
803 addr->atype = IPVL_IPV4;
804#if IS_ENABLED(CONFIG_IPV6)
805 } else {
806 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
807 addr->atype = IPVL_IPV6;
808#endif
809 }
810
811 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
812
813 /* If the interface is not up, the address will be added to the hash
814 * list by ipvlan_open.
815 */
816 if (netif_running(ipvlan->dev))
817 ipvlan_ht_addr_add(ipvlan, addr);
818
819 return 0;
820}
821
822static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
823{
824 struct ipvl_addr *addr;
825
826 spin_lock_bh(&ipvlan->addrs_lock);
827 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
828 if (!addr) {
829 spin_unlock_bh(&ipvlan->addrs_lock);
830 return;
831 }
832
833 ipvlan_ht_addr_del(addr);
834 list_del_rcu(&addr->anode);
835 spin_unlock_bh(&ipvlan->addrs_lock);
836 kfree_rcu(addr, rcu);
837}
838
839static bool ipvlan_is_valid_dev(const struct net_device *dev)
840{
841 struct ipvl_dev *ipvlan = netdev_priv(dev);
842
843 if (!netif_is_ipvlan(dev))
844 return false;
845
846 if (!ipvlan || !ipvlan->port)
847 return false;
848
849 return true;
850}
851
852#if IS_ENABLED(CONFIG_IPV6)
853static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
854{
855 int ret = -EINVAL;
856
857 spin_lock_bh(&ipvlan->addrs_lock);
858 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
859 netif_err(ipvlan, ifup, ipvlan->dev,
860 "Failed to add IPv6=%pI6c addr for %s intf\n",
861 ip6_addr, ipvlan->dev->name);
862 else
863 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
864 spin_unlock_bh(&ipvlan->addrs_lock);
865 return ret;
866}
867
868static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
869{
870 return ipvlan_del_addr(ipvlan, ip6_addr, true);
871}
872
873static int ipvlan_addr6_event(struct notifier_block *unused,
874 unsigned long event, void *ptr)
875{
876 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
877 struct net_device *dev = (struct net_device *)if6->idev->dev;
878 struct ipvl_dev *ipvlan = netdev_priv(dev);
879
880 if (!ipvlan_is_valid_dev(dev))
881 return NOTIFY_DONE;
882
883 switch (event) {
884 case NETDEV_UP:
885 if (ipvlan_add_addr6(ipvlan, &if6->addr))
886 return NOTIFY_BAD;
887 break;
888
889 case NETDEV_DOWN:
890 ipvlan_del_addr6(ipvlan, &if6->addr);
891 break;
892 }
893
894 return NOTIFY_OK;
895}
896
897static int ipvlan_addr6_validator_event(struct notifier_block *unused,
898 unsigned long event, void *ptr)
899{
900 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
901 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
902 struct ipvl_dev *ipvlan = netdev_priv(dev);
903
904 if (!ipvlan_is_valid_dev(dev))
905 return NOTIFY_DONE;
906
907 switch (event) {
908 case NETDEV_UP:
909 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
910 NL_SET_ERR_MSG(i6vi->extack,
911 "Address already assigned to an ipvlan device");
912 return notifier_from_errno(-EADDRINUSE);
913 }
914 break;
915 }
916
917 return NOTIFY_OK;
918}
919#endif
920
921static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
922{
923 int ret = -EINVAL;
924
925 spin_lock_bh(&ipvlan->addrs_lock);
926 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
927 netif_err(ipvlan, ifup, ipvlan->dev,
928 "Failed to add IPv4=%pI4 on %s intf.\n",
929 ip4_addr, ipvlan->dev->name);
930 else
931 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
932 spin_unlock_bh(&ipvlan->addrs_lock);
933 return ret;
934}
935
936static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
937{
938 return ipvlan_del_addr(ipvlan, ip4_addr, false);
939}
940
941static int ipvlan_addr4_event(struct notifier_block *unused,
942 unsigned long event, void *ptr)
943{
944 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
945 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
946 struct ipvl_dev *ipvlan = netdev_priv(dev);
947 struct in_addr ip4_addr;
948
949 if (!ipvlan_is_valid_dev(dev))
950 return NOTIFY_DONE;
951
952 switch (event) {
953 case NETDEV_UP:
954 ip4_addr.s_addr = if4->ifa_address;
955 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
956 return NOTIFY_BAD;
957 break;
958
959 case NETDEV_DOWN:
960 ip4_addr.s_addr = if4->ifa_address;
961 ipvlan_del_addr4(ipvlan, &ip4_addr);
962 break;
963 }
964
965 return NOTIFY_OK;
966}
967
968static int ipvlan_addr4_validator_event(struct notifier_block *unused,
969 unsigned long event, void *ptr)
970{
971 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
972 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
973 struct ipvl_dev *ipvlan = netdev_priv(dev);
974
975 if (!ipvlan_is_valid_dev(dev))
976 return NOTIFY_DONE;
977
978 switch (event) {
979 case NETDEV_UP:
980 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
981 NL_SET_ERR_MSG(ivi->extack,
982 "Address already assigned to an ipvlan device");
983 return notifier_from_errno(-EADDRINUSE);
984 }
985 break;
986 }
987
988 return NOTIFY_OK;
989}
990
991static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
992 .notifier_call = ipvlan_addr4_event,
993};
994
995static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
996 .notifier_call = ipvlan_addr4_validator_event,
997};
998
999static struct notifier_block ipvlan_notifier_block __read_mostly = {
1000 .notifier_call = ipvlan_device_event,
1001};
1002
1003#if IS_ENABLED(CONFIG_IPV6)
1004static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1005 .notifier_call = ipvlan_addr6_event,
1006};
1007
1008static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1009 .notifier_call = ipvlan_addr6_validator_event,
1010};
1011#endif
1012
1013static int __init ipvlan_init_module(void)
1014{
1015 int err;
1016
1017 ipvlan_init_secret();
1018 register_netdevice_notifier(&ipvlan_notifier_block);
1019#if IS_ENABLED(CONFIG_IPV6)
1020 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1021 register_inet6addr_validator_notifier(
1022 &ipvlan_addr6_vtor_notifier_block);
1023#endif
1024 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1025 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1026
1027 err = ipvlan_l3s_init();
1028 if (err < 0)
1029 goto error;
1030
1031 err = ipvlan_link_register(&ipvlan_link_ops);
1032 if (err < 0) {
1033 ipvlan_l3s_cleanup();
1034 goto error;
1035 }
1036
1037 return 0;
1038error:
1039 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1040 unregister_inetaddr_validator_notifier(
1041 &ipvlan_addr4_vtor_notifier_block);
1042#if IS_ENABLED(CONFIG_IPV6)
1043 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1044 unregister_inet6addr_validator_notifier(
1045 &ipvlan_addr6_vtor_notifier_block);
1046#endif
1047 unregister_netdevice_notifier(&ipvlan_notifier_block);
1048 return err;
1049}
1050
1051static void __exit ipvlan_cleanup_module(void)
1052{
1053 rtnl_link_unregister(&ipvlan_link_ops);
1054 ipvlan_l3s_cleanup();
1055 unregister_netdevice_notifier(&ipvlan_notifier_block);
1056 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1057 unregister_inetaddr_validator_notifier(
1058 &ipvlan_addr4_vtor_notifier_block);
1059#if IS_ENABLED(CONFIG_IPV6)
1060 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1061 unregister_inet6addr_validator_notifier(
1062 &ipvlan_addr6_vtor_notifier_block);
1063#endif
1064}
1065
1066module_init(ipvlan_init_module);
1067module_exit(ipvlan_cleanup_module);
1068
1069MODULE_LICENSE("GPL");
1070MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1071MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1072MODULE_ALIAS_RTNL_LINK("ipvlan");