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[mirror_ubuntu-jammy-kernel.git] / drivers / net / ipvlan / ipvlan_main.c
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
7 static 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
43 fail:
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
59 static 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
86 err:
87 kfree(port);
88 return err;
89 }
90
91 static 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
127 static 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
163 static 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
177 static 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
196 static 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
213 static 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
236 static 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
251 static 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
260 static 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
287 static 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
327 static 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
335 static 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
345 static 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
352 static 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
367 static 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
382 static 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
389 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
390 {
391 ipvlan->dev->mtu = dev->mtu;
392 }
393
394 static 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
400 static 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
408 static 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
415 static 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
422 static 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
429 static 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
437 static 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
473 static size_t ipvlan_nl_getsize(const struct net_device *dev)
474 {
475 return (0
476 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
477 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
478 );
479 }
480
481 static 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
508 static 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
526 err:
527 return ret;
528 }
529
530 int 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
637 unlink_netdev:
638 netdev_upper_dev_unlink(phy_dev, dev);
639 remove_ida:
640 ida_simple_remove(&port->ida, dev->dev_id);
641 unregister_netdev:
642 unregister_netdevice(dev);
643 return err;
644 }
645 EXPORT_SYMBOL_GPL(ipvlan_link_new);
646
647 void 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 }
665 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
666
667 void 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 }
679 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
680
681 static 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
687 static 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
696 int 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 }
706 EXPORT_SYMBOL_GPL(ipvlan_link_register);
707
708 static 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 */
792 static 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
822 static 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
839 static 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)
853 static 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
868 static 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
873 static 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
897 static 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
921 static 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
936 static 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
941 static 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
968 static 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
991 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
992 .notifier_call = ipvlan_addr4_event,
993 };
994
995 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
996 .notifier_call = ipvlan_addr4_validator_event,
997 };
998
999 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1000 .notifier_call = ipvlan_device_event,
1001 };
1002
1003 #if IS_ENABLED(CONFIG_IPV6)
1004 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1005 .notifier_call = ipvlan_addr6_event,
1006 };
1007
1008 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1009 .notifier_call = ipvlan_addr6_validator_event,
1010 };
1011 #endif
1012
1013 static 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;
1038 error:
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
1051 static 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
1066 module_init(ipvlan_init_module);
1067 module_exit(ipvlan_cleanup_module);
1068
1069 MODULE_LICENSE("GPL");
1070 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1071 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1072 MODULE_ALIAS_RTNL_LINK("ipvlan");
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