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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
[mirror_ubuntu-eoan-kernel.git] / drivers / net / ipvlan / ipvlan_main.c
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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
3 */
4
5#include "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_FEATURES \
110 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
111 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
112 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
113 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
114
115#define IPVLAN_STATE_MASK \
116 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
117
118static int ipvlan_init(struct net_device *dev)
119{
120 struct ipvl_dev *ipvlan = netdev_priv(dev);
121 struct net_device *phy_dev = ipvlan->phy_dev;
122 struct ipvl_port *port;
123 int err;
124
125 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
126 (phy_dev->state & IPVLAN_STATE_MASK);
127 dev->features = phy_dev->features & IPVLAN_FEATURES;
128 dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
129 dev->gso_max_size = phy_dev->gso_max_size;
130 dev->gso_max_segs = phy_dev->gso_max_segs;
131 dev->hard_header_len = phy_dev->hard_header_len;
132
133 netdev_lockdep_set_classes(dev);
134
135 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
136 if (!ipvlan->pcpu_stats)
137 return -ENOMEM;
138
139 if (!netif_is_ipvlan_port(phy_dev)) {
140 err = ipvlan_port_create(phy_dev);
141 if (err < 0) {
142 free_percpu(ipvlan->pcpu_stats);
143 return err;
144 }
145 }
146 port = ipvlan_port_get_rtnl(phy_dev);
147 port->count += 1;
148 return 0;
149}
150
151static void ipvlan_uninit(struct net_device *dev)
152{
153 struct ipvl_dev *ipvlan = netdev_priv(dev);
154 struct net_device *phy_dev = ipvlan->phy_dev;
155 struct ipvl_port *port;
156
157 free_percpu(ipvlan->pcpu_stats);
158
159 port = ipvlan_port_get_rtnl(phy_dev);
160 port->count -= 1;
161 if (!port->count)
162 ipvlan_port_destroy(port->dev);
163}
164
165static int ipvlan_open(struct net_device *dev)
166{
167 struct ipvl_dev *ipvlan = netdev_priv(dev);
168 struct net_device *phy_dev = ipvlan->phy_dev;
169 struct ipvl_addr *addr;
170
171 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
172 ipvlan->port->mode == IPVLAN_MODE_L3S)
173 dev->flags |= IFF_NOARP;
174 else
175 dev->flags &= ~IFF_NOARP;
176
177 rcu_read_lock();
178 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
179 ipvlan_ht_addr_add(ipvlan, addr);
180 rcu_read_unlock();
181
182 return dev_uc_add(phy_dev, phy_dev->dev_addr);
183}
184
185static int ipvlan_stop(struct net_device *dev)
186{
187 struct ipvl_dev *ipvlan = netdev_priv(dev);
188 struct net_device *phy_dev = ipvlan->phy_dev;
189 struct ipvl_addr *addr;
190
191 dev_uc_unsync(phy_dev, dev);
192 dev_mc_unsync(phy_dev, dev);
193
194 dev_uc_del(phy_dev, phy_dev->dev_addr);
195
196 rcu_read_lock();
197 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
198 ipvlan_ht_addr_del(addr);
199 rcu_read_unlock();
200
201 return 0;
202}
203
204static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
205 struct net_device *dev)
206{
207 const struct ipvl_dev *ipvlan = netdev_priv(dev);
208 int skblen = skb->len;
209 int ret;
210
211 ret = ipvlan_queue_xmit(skb, dev);
212 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
213 struct ipvl_pcpu_stats *pcptr;
214
215 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
216
217 u64_stats_update_begin(&pcptr->syncp);
218 pcptr->tx_pkts++;
219 pcptr->tx_bytes += skblen;
220 u64_stats_update_end(&pcptr->syncp);
221 } else {
222 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
223 }
224 return ret;
225}
226
227static netdev_features_t ipvlan_fix_features(struct net_device *dev,
228 netdev_features_t features)
229{
230 struct ipvl_dev *ipvlan = netdev_priv(dev);
231
232 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
233}
234
235static void ipvlan_change_rx_flags(struct net_device *dev, int change)
236{
237 struct ipvl_dev *ipvlan = netdev_priv(dev);
238 struct net_device *phy_dev = ipvlan->phy_dev;
239
240 if (change & IFF_ALLMULTI)
241 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
242}
243
244static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
245{
246 struct ipvl_dev *ipvlan = netdev_priv(dev);
247
248 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
249 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
250 } else {
251 struct netdev_hw_addr *ha;
252 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
253
254 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
255 netdev_for_each_mc_addr(ha, dev)
256 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
257
258 /* Turn-on broadcast bit irrespective of address family,
259 * since broadcast is deferred to a work-queue, hence no
260 * impact on fast-path processing.
261 */
262 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
263
264 bitmap_copy(ipvlan->mac_filters, mc_filters,
265 IPVLAN_MAC_FILTER_SIZE);
266 }
267 dev_uc_sync(ipvlan->phy_dev, dev);
268 dev_mc_sync(ipvlan->phy_dev, dev);
269}
270
271static void ipvlan_get_stats64(struct net_device *dev,
272 struct rtnl_link_stats64 *s)
273{
274 struct ipvl_dev *ipvlan = netdev_priv(dev);
275
276 if (ipvlan->pcpu_stats) {
277 struct ipvl_pcpu_stats *pcptr;
278 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
279 u32 rx_errs = 0, tx_drps = 0;
280 u32 strt;
281 int idx;
282
283 for_each_possible_cpu(idx) {
284 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
285 do {
286 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
287 rx_pkts = pcptr->rx_pkts;
288 rx_bytes = pcptr->rx_bytes;
289 rx_mcast = pcptr->rx_mcast;
290 tx_pkts = pcptr->tx_pkts;
291 tx_bytes = pcptr->tx_bytes;
292 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
293 strt));
294
295 s->rx_packets += rx_pkts;
296 s->rx_bytes += rx_bytes;
297 s->multicast += rx_mcast;
298 s->tx_packets += tx_pkts;
299 s->tx_bytes += tx_bytes;
300
301 /* u32 values are updated without syncp protection. */
302 rx_errs += pcptr->rx_errs;
303 tx_drps += pcptr->tx_drps;
304 }
305 s->rx_errors = rx_errs;
306 s->rx_dropped = rx_errs;
307 s->tx_dropped = tx_drps;
308 }
309}
310
311static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
312{
313 struct ipvl_dev *ipvlan = netdev_priv(dev);
314 struct net_device *phy_dev = ipvlan->phy_dev;
315
316 return vlan_vid_add(phy_dev, proto, vid);
317}
318
319static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
320 u16 vid)
321{
322 struct ipvl_dev *ipvlan = netdev_priv(dev);
323 struct net_device *phy_dev = ipvlan->phy_dev;
324
325 vlan_vid_del(phy_dev, proto, vid);
326 return 0;
327}
328
329static int ipvlan_get_iflink(const struct net_device *dev)
330{
331 struct ipvl_dev *ipvlan = netdev_priv(dev);
332
333 return ipvlan->phy_dev->ifindex;
334}
335
336static const struct net_device_ops ipvlan_netdev_ops = {
337 .ndo_init = ipvlan_init,
338 .ndo_uninit = ipvlan_uninit,
339 .ndo_open = ipvlan_open,
340 .ndo_stop = ipvlan_stop,
341 .ndo_start_xmit = ipvlan_start_xmit,
342 .ndo_fix_features = ipvlan_fix_features,
343 .ndo_change_rx_flags = ipvlan_change_rx_flags,
344 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
345 .ndo_get_stats64 = ipvlan_get_stats64,
346 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
347 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
348 .ndo_get_iflink = ipvlan_get_iflink,
349};
350
351static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
352 unsigned short type, const void *daddr,
353 const void *saddr, unsigned len)
354{
355 const struct ipvl_dev *ipvlan = netdev_priv(dev);
356 struct net_device *phy_dev = ipvlan->phy_dev;
357
358 /* TODO Probably use a different field than dev_addr so that the
359 * mac-address on the virtual device is portable and can be carried
360 * while the packets use the mac-addr on the physical device.
361 */
362 return dev_hard_header(skb, phy_dev, type, daddr,
363 saddr ? : phy_dev->dev_addr, len);
364}
365
366static const struct header_ops ipvlan_header_ops = {
367 .create = ipvlan_hard_header,
368 .parse = eth_header_parse,
369 .cache = eth_header_cache,
370 .cache_update = eth_header_cache_update,
371};
372
373static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
374{
375 ipvlan->dev->mtu = dev->mtu;
376}
377
378static bool netif_is_ipvlan(const struct net_device *dev)
379{
380 /* both ipvlan and ipvtap devices use the same netdev_ops */
381 return dev->netdev_ops == &ipvlan_netdev_ops;
382}
383
384static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
385 struct ethtool_link_ksettings *cmd)
386{
387 const struct ipvl_dev *ipvlan = netdev_priv(dev);
388
389 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
390}
391
392static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
393 struct ethtool_drvinfo *drvinfo)
394{
395 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
396 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
397}
398
399static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
400{
401 const struct ipvl_dev *ipvlan = netdev_priv(dev);
402
403 return ipvlan->msg_enable;
404}
405
406static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
407{
408 struct ipvl_dev *ipvlan = netdev_priv(dev);
409
410 ipvlan->msg_enable = value;
411}
412
413static const struct ethtool_ops ipvlan_ethtool_ops = {
414 .get_link = ethtool_op_get_link,
415 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
416 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
417 .get_msglevel = ipvlan_ethtool_get_msglevel,
418 .set_msglevel = ipvlan_ethtool_set_msglevel,
419};
420
421static int ipvlan_nl_changelink(struct net_device *dev,
422 struct nlattr *tb[], struct nlattr *data[],
423 struct netlink_ext_ack *extack)
424{
425 struct ipvl_dev *ipvlan = netdev_priv(dev);
426 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
427 int err = 0;
428
429 if (!data)
430 return 0;
431 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
432 return -EPERM;
433
434 if (data[IFLA_IPVLAN_MODE]) {
435 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
436
437 err = ipvlan_set_port_mode(port, nmode, extack);
438 }
439
440 if (!err && data[IFLA_IPVLAN_FLAGS]) {
441 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
442
443 if (flags & IPVLAN_F_PRIVATE)
444 ipvlan_mark_private(port);
445 else
446 ipvlan_clear_private(port);
447
448 if (flags & IPVLAN_F_VEPA)
449 ipvlan_mark_vepa(port);
450 else
451 ipvlan_clear_vepa(port);
452 }
453
454 return err;
455}
456
457static size_t ipvlan_nl_getsize(const struct net_device *dev)
458{
459 return (0
460 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
461 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
462 );
463}
464
465static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
466 struct netlink_ext_ack *extack)
467{
468 if (!data)
469 return 0;
470
471 if (data[IFLA_IPVLAN_MODE]) {
472 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
473
474 if (mode >= IPVLAN_MODE_MAX)
475 return -EINVAL;
476 }
477 if (data[IFLA_IPVLAN_FLAGS]) {
478 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
479
480 /* Only two bits are used at this moment. */
481 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
482 return -EINVAL;
483 /* Also both flags can't be active at the same time. */
484 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
485 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
486 return -EINVAL;
487 }
488
489 return 0;
490}
491
492static int ipvlan_nl_fillinfo(struct sk_buff *skb,
493 const struct net_device *dev)
494{
495 struct ipvl_dev *ipvlan = netdev_priv(dev);
496 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
497 int ret = -EINVAL;
498
499 if (!port)
500 goto err;
501
502 ret = -EMSGSIZE;
503 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
504 goto err;
505 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
506 goto err;
507
508 return 0;
509
510err:
511 return ret;
512}
513
514int ipvlan_link_new(struct net *src_net, struct net_device *dev,
515 struct nlattr *tb[], struct nlattr *data[],
516 struct netlink_ext_ack *extack)
517{
518 struct ipvl_dev *ipvlan = netdev_priv(dev);
519 struct ipvl_port *port;
520 struct net_device *phy_dev;
521 int err;
522 u16 mode = IPVLAN_MODE_L3;
523
524 if (!tb[IFLA_LINK])
525 return -EINVAL;
526
527 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
528 if (!phy_dev)
529 return -ENODEV;
530
531 if (netif_is_ipvlan(phy_dev)) {
532 struct ipvl_dev *tmp = netdev_priv(phy_dev);
533
534 phy_dev = tmp->phy_dev;
535 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
536 return -EPERM;
537 } else if (!netif_is_ipvlan_port(phy_dev)) {
538 /* Exit early if the underlying link is invalid or busy */
539 if (phy_dev->type != ARPHRD_ETHER ||
540 phy_dev->flags & IFF_LOOPBACK) {
541 netdev_err(phy_dev,
542 "Master is either lo or non-ether device\n");
543 return -EINVAL;
544 }
545
546 if (netdev_is_rx_handler_busy(phy_dev)) {
547 netdev_err(phy_dev, "Device is already in use.\n");
548 return -EBUSY;
549 }
550 }
551
552 ipvlan->phy_dev = phy_dev;
553 ipvlan->dev = dev;
554 ipvlan->sfeatures = IPVLAN_FEATURES;
555 if (!tb[IFLA_MTU])
556 ipvlan_adjust_mtu(ipvlan, phy_dev);
557 INIT_LIST_HEAD(&ipvlan->addrs);
558 spin_lock_init(&ipvlan->addrs_lock);
559
560 /* TODO Probably put random address here to be presented to the
561 * world but keep using the physical-dev address for the outgoing
562 * packets.
563 */
564 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
565
566 dev->priv_flags |= IFF_NO_RX_HANDLER;
567
568 err = register_netdevice(dev);
569 if (err < 0)
570 return err;
571
572 /* ipvlan_init() would have created the port, if required */
573 port = ipvlan_port_get_rtnl(phy_dev);
574 ipvlan->port = port;
575
576 /* If the port-id base is at the MAX value, then wrap it around and
577 * begin from 0x1 again. This may be due to a busy system where lots
578 * of slaves are getting created and deleted.
579 */
580 if (port->dev_id_start == 0xFFFE)
581 port->dev_id_start = 0x1;
582
583 /* Since L2 address is shared among all IPvlan slaves including
584 * master, use unique 16 bit dev-ids to diffentiate among them.
585 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
586 * slave link [see addrconf_ifid_eui48()].
587 */
588 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
589 GFP_KERNEL);
590 if (err < 0)
591 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
592 GFP_KERNEL);
593 if (err < 0)
594 goto unregister_netdev;
595 dev->dev_id = err;
596
597 /* Increment id-base to the next slot for the future assignment */
598 port->dev_id_start = err + 1;
599
600 err = netdev_upper_dev_link(phy_dev, dev, extack);
601 if (err)
602 goto remove_ida;
603
604 /* Flags are per port and latest update overrides. User has
605 * to be consistent in setting it just like the mode attribute.
606 */
607 if (data && data[IFLA_IPVLAN_FLAGS])
608 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
609
610 if (data && data[IFLA_IPVLAN_MODE])
611 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
612
613 err = ipvlan_set_port_mode(port, mode, extack);
614 if (err)
615 goto unlink_netdev;
616
617 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
618 netif_stacked_transfer_operstate(phy_dev, dev);
619 return 0;
620
621unlink_netdev:
622 netdev_upper_dev_unlink(phy_dev, dev);
623remove_ida:
624 ida_simple_remove(&port->ida, dev->dev_id);
625unregister_netdev:
626 unregister_netdevice(dev);
627 return err;
628}
629EXPORT_SYMBOL_GPL(ipvlan_link_new);
630
631void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
632{
633 struct ipvl_dev *ipvlan = netdev_priv(dev);
634 struct ipvl_addr *addr, *next;
635
636 spin_lock_bh(&ipvlan->addrs_lock);
637 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
638 ipvlan_ht_addr_del(addr);
639 list_del_rcu(&addr->anode);
640 kfree_rcu(addr, rcu);
641 }
642 spin_unlock_bh(&ipvlan->addrs_lock);
643
644 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
645 list_del_rcu(&ipvlan->pnode);
646 unregister_netdevice_queue(dev, head);
647 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
648}
649EXPORT_SYMBOL_GPL(ipvlan_link_delete);
650
651void ipvlan_link_setup(struct net_device *dev)
652{
653 ether_setup(dev);
654
655 dev->max_mtu = ETH_MAX_MTU;
656 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
657 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
658 dev->netdev_ops = &ipvlan_netdev_ops;
659 dev->needs_free_netdev = true;
660 dev->header_ops = &ipvlan_header_ops;
661 dev->ethtool_ops = &ipvlan_ethtool_ops;
662}
663EXPORT_SYMBOL_GPL(ipvlan_link_setup);
664
665static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
666{
667 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
668 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
669};
670
671static struct rtnl_link_ops ipvlan_link_ops = {
672 .kind = "ipvlan",
673 .priv_size = sizeof(struct ipvl_dev),
674
675 .setup = ipvlan_link_setup,
676 .newlink = ipvlan_link_new,
677 .dellink = ipvlan_link_delete,
678};
679
680int ipvlan_link_register(struct rtnl_link_ops *ops)
681{
682 ops->get_size = ipvlan_nl_getsize;
683 ops->policy = ipvlan_nl_policy;
684 ops->validate = ipvlan_nl_validate;
685 ops->fill_info = ipvlan_nl_fillinfo;
686 ops->changelink = ipvlan_nl_changelink;
687 ops->maxtype = IFLA_IPVLAN_MAX;
688 return rtnl_link_register(ops);
689}
690EXPORT_SYMBOL_GPL(ipvlan_link_register);
691
692static int ipvlan_device_event(struct notifier_block *unused,
693 unsigned long event, void *ptr)
694{
695 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
696 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
697 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
698 struct ipvl_dev *ipvlan, *next;
699 struct ipvl_port *port;
700 LIST_HEAD(lst_kill);
701 int err;
702
703 if (!netif_is_ipvlan_port(dev))
704 return NOTIFY_DONE;
705
706 port = ipvlan_port_get_rtnl(dev);
707
708 switch (event) {
709 case NETDEV_CHANGE:
710 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
711 netif_stacked_transfer_operstate(ipvlan->phy_dev,
712 ipvlan->dev);
713 break;
714
715 case NETDEV_REGISTER: {
716 struct net *oldnet, *newnet = dev_net(dev);
717
718 oldnet = read_pnet(&port->pnet);
719 if (net_eq(newnet, oldnet))
720 break;
721
722 write_pnet(&port->pnet, newnet);
723
724 ipvlan_migrate_l3s_hook(oldnet, newnet);
725 break;
726 }
727 case NETDEV_UNREGISTER:
728 if (dev->reg_state != NETREG_UNREGISTERING)
729 break;
730
731 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
732 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
733 &lst_kill);
734 unregister_netdevice_many(&lst_kill);
735 break;
736
737 case NETDEV_FEAT_CHANGE:
738 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
739 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
740 ipvlan->dev->gso_max_size = dev->gso_max_size;
741 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
742 netdev_features_change(ipvlan->dev);
743 }
744 break;
745
746 case NETDEV_CHANGEMTU:
747 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
748 ipvlan_adjust_mtu(ipvlan, dev);
749 break;
750
751 case NETDEV_PRE_CHANGEADDR:
752 prechaddr_info = ptr;
753 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
754 err = dev_pre_changeaddr_notify(ipvlan->dev,
755 prechaddr_info->dev_addr,
756 extack);
757 if (err)
758 return notifier_from_errno(err);
759 }
760 break;
761
762 case NETDEV_CHANGEADDR:
763 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
764 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
765 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
766 }
767 break;
768
769 case NETDEV_PRE_TYPE_CHANGE:
770 /* Forbid underlying device to change its type. */
771 return NOTIFY_BAD;
772 }
773 return NOTIFY_DONE;
774}
775
776/* the caller must held the addrs lock */
777static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
778{
779 struct ipvl_addr *addr;
780
781 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
782 if (!addr)
783 return -ENOMEM;
784
785 addr->master = ipvlan;
786 if (!is_v6) {
787 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
788 addr->atype = IPVL_IPV4;
789#if IS_ENABLED(CONFIG_IPV6)
790 } else {
791 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
792 addr->atype = IPVL_IPV6;
793#endif
794 }
795
796 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
797
798 /* If the interface is not up, the address will be added to the hash
799 * list by ipvlan_open.
800 */
801 if (netif_running(ipvlan->dev))
802 ipvlan_ht_addr_add(ipvlan, addr);
803
804 return 0;
805}
806
807static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
808{
809 struct ipvl_addr *addr;
810
811 spin_lock_bh(&ipvlan->addrs_lock);
812 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
813 if (!addr) {
814 spin_unlock_bh(&ipvlan->addrs_lock);
815 return;
816 }
817
818 ipvlan_ht_addr_del(addr);
819 list_del_rcu(&addr->anode);
820 spin_unlock_bh(&ipvlan->addrs_lock);
821 kfree_rcu(addr, rcu);
822}
823
824static bool ipvlan_is_valid_dev(const struct net_device *dev)
825{
826 struct ipvl_dev *ipvlan = netdev_priv(dev);
827
828 if (!netif_is_ipvlan(dev))
829 return false;
830
831 if (!ipvlan || !ipvlan->port)
832 return false;
833
834 return true;
835}
836
837#if IS_ENABLED(CONFIG_IPV6)
838static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
839{
840 int ret = -EINVAL;
841
842 spin_lock_bh(&ipvlan->addrs_lock);
843 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
844 netif_err(ipvlan, ifup, ipvlan->dev,
845 "Failed to add IPv6=%pI6c addr for %s intf\n",
846 ip6_addr, ipvlan->dev->name);
847 else
848 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
849 spin_unlock_bh(&ipvlan->addrs_lock);
850 return ret;
851}
852
853static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
854{
855 return ipvlan_del_addr(ipvlan, ip6_addr, true);
856}
857
858static int ipvlan_addr6_event(struct notifier_block *unused,
859 unsigned long event, void *ptr)
860{
861 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
862 struct net_device *dev = (struct net_device *)if6->idev->dev;
863 struct ipvl_dev *ipvlan = netdev_priv(dev);
864
865 if (!ipvlan_is_valid_dev(dev))
866 return NOTIFY_DONE;
867
868 switch (event) {
869 case NETDEV_UP:
870 if (ipvlan_add_addr6(ipvlan, &if6->addr))
871 return NOTIFY_BAD;
872 break;
873
874 case NETDEV_DOWN:
875 ipvlan_del_addr6(ipvlan, &if6->addr);
876 break;
877 }
878
879 return NOTIFY_OK;
880}
881
882static int ipvlan_addr6_validator_event(struct notifier_block *unused,
883 unsigned long event, void *ptr)
884{
885 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
886 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
887 struct ipvl_dev *ipvlan = netdev_priv(dev);
888
889 if (!ipvlan_is_valid_dev(dev))
890 return NOTIFY_DONE;
891
892 switch (event) {
893 case NETDEV_UP:
894 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
895 NL_SET_ERR_MSG(i6vi->extack,
896 "Address already assigned to an ipvlan device");
897 return notifier_from_errno(-EADDRINUSE);
898 }
899 break;
900 }
901
902 return NOTIFY_OK;
903}
904#endif
905
906static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
907{
908 int ret = -EINVAL;
909
910 spin_lock_bh(&ipvlan->addrs_lock);
911 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
912 netif_err(ipvlan, ifup, ipvlan->dev,
913 "Failed to add IPv4=%pI4 on %s intf.\n",
914 ip4_addr, ipvlan->dev->name);
915 else
916 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
917 spin_unlock_bh(&ipvlan->addrs_lock);
918 return ret;
919}
920
921static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
922{
923 return ipvlan_del_addr(ipvlan, ip4_addr, false);
924}
925
926static int ipvlan_addr4_event(struct notifier_block *unused,
927 unsigned long event, void *ptr)
928{
929 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
930 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
931 struct ipvl_dev *ipvlan = netdev_priv(dev);
932 struct in_addr ip4_addr;
933
934 if (!ipvlan_is_valid_dev(dev))
935 return NOTIFY_DONE;
936
937 switch (event) {
938 case NETDEV_UP:
939 ip4_addr.s_addr = if4->ifa_address;
940 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
941 return NOTIFY_BAD;
942 break;
943
944 case NETDEV_DOWN:
945 ip4_addr.s_addr = if4->ifa_address;
946 ipvlan_del_addr4(ipvlan, &ip4_addr);
947 break;
948 }
949
950 return NOTIFY_OK;
951}
952
953static int ipvlan_addr4_validator_event(struct notifier_block *unused,
954 unsigned long event, void *ptr)
955{
956 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
957 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
958 struct ipvl_dev *ipvlan = netdev_priv(dev);
959
960 if (!ipvlan_is_valid_dev(dev))
961 return NOTIFY_DONE;
962
963 switch (event) {
964 case NETDEV_UP:
965 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
966 NL_SET_ERR_MSG(ivi->extack,
967 "Address already assigned to an ipvlan device");
968 return notifier_from_errno(-EADDRINUSE);
969 }
970 break;
971 }
972
973 return NOTIFY_OK;
974}
975
976static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
977 .notifier_call = ipvlan_addr4_event,
978};
979
980static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
981 .notifier_call = ipvlan_addr4_validator_event,
982};
983
984static struct notifier_block ipvlan_notifier_block __read_mostly = {
985 .notifier_call = ipvlan_device_event,
986};
987
988#if IS_ENABLED(CONFIG_IPV6)
989static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
990 .notifier_call = ipvlan_addr6_event,
991};
992
993static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
994 .notifier_call = ipvlan_addr6_validator_event,
995};
996#endif
997
998static int __init ipvlan_init_module(void)
999{
1000 int err;
1001
1002 ipvlan_init_secret();
1003 register_netdevice_notifier(&ipvlan_notifier_block);
1004#if IS_ENABLED(CONFIG_IPV6)
1005 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1006 register_inet6addr_validator_notifier(
1007 &ipvlan_addr6_vtor_notifier_block);
1008#endif
1009 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1010 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1011
1012 err = ipvlan_l3s_init();
1013 if (err < 0)
1014 goto error;
1015
1016 err = ipvlan_link_register(&ipvlan_link_ops);
1017 if (err < 0) {
1018 ipvlan_l3s_cleanup();
1019 goto error;
1020 }
1021
1022 return 0;
1023error:
1024 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1025 unregister_inetaddr_validator_notifier(
1026 &ipvlan_addr4_vtor_notifier_block);
1027#if IS_ENABLED(CONFIG_IPV6)
1028 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1029 unregister_inet6addr_validator_notifier(
1030 &ipvlan_addr6_vtor_notifier_block);
1031#endif
1032 unregister_netdevice_notifier(&ipvlan_notifier_block);
1033 return err;
1034}
1035
1036static void __exit ipvlan_cleanup_module(void)
1037{
1038 rtnl_link_unregister(&ipvlan_link_ops);
1039 ipvlan_l3s_cleanup();
1040 unregister_netdevice_notifier(&ipvlan_notifier_block);
1041 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1042 unregister_inetaddr_validator_notifier(
1043 &ipvlan_addr4_vtor_notifier_block);
1044#if IS_ENABLED(CONFIG_IPV6)
1045 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1046 unregister_inet6addr_validator_notifier(
1047 &ipvlan_addr6_vtor_notifier_block);
1048#endif
1049}
1050
1051module_init(ipvlan_init_module);
1052module_exit(ipvlan_cleanup_module);
1053
1054MODULE_LICENSE("GPL");
1055MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1056MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1057MODULE_ALIAS_RTNL_LINK("ipvlan");
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