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drm/tidss: Fix typos
[drm/drm-misc.git] / drivers / net / ipvlan / ipvlan_main.c
blobee2c3cf4df365eb3d4e476d421a7ec42f30016d1
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
3 */
4
5 #include <linux/ethtool.h>
6
7 #include "ipvlan.h"
8
9 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
10 struct netlink_ext_ack *extack)
11 {
12 struct ipvl_dev *ipvlan;
13 unsigned int flags;
14 int err;
15
16 ASSERT_RTNL();
17 if (port->mode != nval) {
18 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
19 flags = ipvlan->dev->flags;
20 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
21 err = dev_change_flags(ipvlan->dev,
22 flags | IFF_NOARP,
23 extack);
24 } else {
25 err = dev_change_flags(ipvlan->dev,
26 flags & ~IFF_NOARP,
27 extack);
28 }
29 if (unlikely(err))
30 goto fail;
31 }
32 if (nval == IPVLAN_MODE_L3S) {
33 /* New mode is L3S */
34 err = ipvlan_l3s_register(port);
35 if (err)
36 goto fail;
37 } else if (port->mode == IPVLAN_MODE_L3S) {
38 /* Old mode was L3S */
39 ipvlan_l3s_unregister(port);
40 }
41 port->mode = nval;
42 }
43 return 0;
44
45 fail:
46 /* Undo the flags changes that have been done so far. */
47 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
48 flags = ipvlan->dev->flags;
49 if (port->mode == IPVLAN_MODE_L3 ||
50 port->mode == IPVLAN_MODE_L3S)
51 dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
52 NULL);
53 else
54 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
55 NULL);
56 }
57
58 return err;
59 }
60
61 static int ipvlan_port_create(struct net_device *dev)
62 {
63 struct ipvl_port *port;
64 int err, idx;
65
66 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
67 if (!port)
68 return -ENOMEM;
69
70 write_pnet(&port->pnet, dev_net(dev));
71 port->dev = dev;
72 port->mode = IPVLAN_MODE_L3;
73 INIT_LIST_HEAD(&port->ipvlans);
74 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
75 INIT_HLIST_HEAD(&port->hlhead[idx]);
76
77 skb_queue_head_init(&port->backlog);
78 INIT_WORK(&port->wq, ipvlan_process_multicast);
79 ida_init(&port->ida);
80 port->dev_id_start = 1;
81
82 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
83 if (err)
84 goto err;
85
86 netdev_hold(dev, &port->dev_tracker, GFP_KERNEL);
87 return 0;
88
89 err:
90 kfree(port);
91 return err;
92 }
93
94 static void ipvlan_port_destroy(struct net_device *dev)
95 {
96 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
97 struct sk_buff *skb;
98
99 netdev_put(dev, &port->dev_tracker);
100 if (port->mode == IPVLAN_MODE_L3S)
101 ipvlan_l3s_unregister(port);
102 netdev_rx_handler_unregister(dev);
103 cancel_work_sync(&port->wq);
104 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
105 dev_put(skb->dev);
106 kfree_skb(skb);
107 }
108 ida_destroy(&port->ida);
109 kfree(port);
110 }
111
112 #define IPVLAN_ALWAYS_ON_OFLOADS \
113 (NETIF_F_SG | NETIF_F_HW_CSUM | \
114 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
115
116 #define IPVLAN_ALWAYS_ON \
117 (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_VLAN_CHALLENGED)
118
119 #define IPVLAN_FEATURES \
120 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
121 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
122 NETIF_F_GRO | NETIF_F_RXCSUM | \
123 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
124
125 /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
126
127 #define IPVLAN_STATE_MASK \
128 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
129
130 static int ipvlan_init(struct net_device *dev)
131 {
132 struct ipvl_dev *ipvlan = netdev_priv(dev);
133 struct net_device *phy_dev = ipvlan->phy_dev;
134 struct ipvl_port *port;
135 int err;
136
137 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
138 (phy_dev->state & IPVLAN_STATE_MASK);
139 dev->features = phy_dev->features & IPVLAN_FEATURES;
140 dev->features |= IPVLAN_ALWAYS_ON;
141 dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
142 dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
143 dev->hw_enc_features |= dev->features;
144 dev->lltx = true;
145 netif_inherit_tso_max(dev, phy_dev);
146 dev->hard_header_len = phy_dev->hard_header_len;
147
148 netdev_lockdep_set_classes(dev);
149
150 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
151 if (!ipvlan->pcpu_stats)
152 return -ENOMEM;
153
154 if (!netif_is_ipvlan_port(phy_dev)) {
155 err = ipvlan_port_create(phy_dev);
156 if (err < 0) {
157 free_percpu(ipvlan->pcpu_stats);
158 return err;
159 }
160 }
161 port = ipvlan_port_get_rtnl(phy_dev);
162 port->count += 1;
163 return 0;
164 }
165
166 static void ipvlan_uninit(struct net_device *dev)
167 {
168 struct ipvl_dev *ipvlan = netdev_priv(dev);
169 struct net_device *phy_dev = ipvlan->phy_dev;
170 struct ipvl_port *port;
171
172 free_percpu(ipvlan->pcpu_stats);
173
174 port = ipvlan_port_get_rtnl(phy_dev);
175 port->count -= 1;
176 if (!port->count)
177 ipvlan_port_destroy(port->dev);
178 }
179
180 static int ipvlan_open(struct net_device *dev)
181 {
182 struct ipvl_dev *ipvlan = netdev_priv(dev);
183 struct ipvl_addr *addr;
184
185 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
186 ipvlan->port->mode == IPVLAN_MODE_L3S)
187 dev->flags |= IFF_NOARP;
188 else
189 dev->flags &= ~IFF_NOARP;
190
191 rcu_read_lock();
192 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
193 ipvlan_ht_addr_add(ipvlan, addr);
194 rcu_read_unlock();
195
196 return 0;
197 }
198
199 static int ipvlan_stop(struct net_device *dev)
200 {
201 struct ipvl_dev *ipvlan = netdev_priv(dev);
202 struct net_device *phy_dev = ipvlan->phy_dev;
203 struct ipvl_addr *addr;
204
205 dev_uc_unsync(phy_dev, dev);
206 dev_mc_unsync(phy_dev, dev);
207
208 rcu_read_lock();
209 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
210 ipvlan_ht_addr_del(addr);
211 rcu_read_unlock();
212
213 return 0;
214 }
215
216 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
217 struct net_device *dev)
218 {
219 const struct ipvl_dev *ipvlan = netdev_priv(dev);
220 int skblen = skb->len;
221 int ret;
222
223 ret = ipvlan_queue_xmit(skb, dev);
224 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
225 struct ipvl_pcpu_stats *pcptr;
226
227 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
228
229 u64_stats_update_begin(&pcptr->syncp);
230 u64_stats_inc(&pcptr->tx_pkts);
231 u64_stats_add(&pcptr->tx_bytes, skblen);
232 u64_stats_update_end(&pcptr->syncp);
233 } else {
234 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
235 }
236 return ret;
237 }
238
239 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
240 netdev_features_t features)
241 {
242 struct ipvl_dev *ipvlan = netdev_priv(dev);
243
244 features |= NETIF_F_ALL_FOR_ALL;
245 features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES);
246 features = netdev_increment_features(ipvlan->phy_dev->features,
247 features, features);
248 features |= IPVLAN_ALWAYS_ON;
249 features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON);
250
251 return features;
252 }
253
254 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
255 {
256 struct ipvl_dev *ipvlan = netdev_priv(dev);
257 struct net_device *phy_dev = ipvlan->phy_dev;
258
259 if (change & IFF_ALLMULTI)
260 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
261 }
262
263 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
264 {
265 struct ipvl_dev *ipvlan = netdev_priv(dev);
266
267 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
268 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
269 } else {
270 struct netdev_hw_addr *ha;
271 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
272
273 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
274 netdev_for_each_mc_addr(ha, dev)
275 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
276
277 /* Turn-on broadcast bit irrespective of address family,
278 * since broadcast is deferred to a work-queue, hence no
279 * impact on fast-path processing.
280 */
281 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
282
283 bitmap_copy(ipvlan->mac_filters, mc_filters,
284 IPVLAN_MAC_FILTER_SIZE);
285 }
286 dev_uc_sync(ipvlan->phy_dev, dev);
287 dev_mc_sync(ipvlan->phy_dev, dev);
288 }
289
290 static void ipvlan_get_stats64(struct net_device *dev,
291 struct rtnl_link_stats64 *s)
292 {
293 struct ipvl_dev *ipvlan = netdev_priv(dev);
294
295 if (ipvlan->pcpu_stats) {
296 struct ipvl_pcpu_stats *pcptr;
297 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
298 u32 rx_errs = 0, tx_drps = 0;
299 u32 strt;
300 int idx;
301
302 for_each_possible_cpu(idx) {
303 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
304 do {
305 strt = u64_stats_fetch_begin(&pcptr->syncp);
306 rx_pkts = u64_stats_read(&pcptr->rx_pkts);
307 rx_bytes = u64_stats_read(&pcptr->rx_bytes);
308 rx_mcast = u64_stats_read(&pcptr->rx_mcast);
309 tx_pkts = u64_stats_read(&pcptr->tx_pkts);
310 tx_bytes = u64_stats_read(&pcptr->tx_bytes);
311 } while (u64_stats_fetch_retry(&pcptr->syncp,
312 strt));
313
314 s->rx_packets += rx_pkts;
315 s->rx_bytes += rx_bytes;
316 s->multicast += rx_mcast;
317 s->tx_packets += tx_pkts;
318 s->tx_bytes += tx_bytes;
319
320 /* u32 values are updated without syncp protection. */
321 rx_errs += READ_ONCE(pcptr->rx_errs);
322 tx_drps += READ_ONCE(pcptr->tx_drps);
323 }
324 s->rx_errors = rx_errs;
325 s->rx_dropped = rx_errs;
326 s->tx_dropped = tx_drps;
327 }
328 s->tx_errors = DEV_STATS_READ(dev, tx_errors);
329 }
330
331 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
332 {
333 struct ipvl_dev *ipvlan = netdev_priv(dev);
334 struct net_device *phy_dev = ipvlan->phy_dev;
335
336 return vlan_vid_add(phy_dev, proto, vid);
337 }
338
339 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
340 u16 vid)
341 {
342 struct ipvl_dev *ipvlan = netdev_priv(dev);
343 struct net_device *phy_dev = ipvlan->phy_dev;
344
345 vlan_vid_del(phy_dev, proto, vid);
346 return 0;
347 }
348
349 static int ipvlan_get_iflink(const struct net_device *dev)
350 {
351 struct ipvl_dev *ipvlan = netdev_priv(dev);
352
353 return READ_ONCE(ipvlan->phy_dev->ifindex);
354 }
355
356 static const struct net_device_ops ipvlan_netdev_ops = {
357 .ndo_init = ipvlan_init,
358 .ndo_uninit = ipvlan_uninit,
359 .ndo_open = ipvlan_open,
360 .ndo_stop = ipvlan_stop,
361 .ndo_start_xmit = ipvlan_start_xmit,
362 .ndo_fix_features = ipvlan_fix_features,
363 .ndo_change_rx_flags = ipvlan_change_rx_flags,
364 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
365 .ndo_get_stats64 = ipvlan_get_stats64,
366 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
367 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
368 .ndo_get_iflink = ipvlan_get_iflink,
369 };
370
371 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
372 unsigned short type, const void *daddr,
373 const void *saddr, unsigned len)
374 {
375 const struct ipvl_dev *ipvlan = netdev_priv(dev);
376 struct net_device *phy_dev = ipvlan->phy_dev;
377
378 /* TODO Probably use a different field than dev_addr so that the
379 * mac-address on the virtual device is portable and can be carried
380 * while the packets use the mac-addr on the physical device.
381 */
382 return dev_hard_header(skb, phy_dev, type, daddr,
383 saddr ? : phy_dev->dev_addr, len);
384 }
385
386 static const struct header_ops ipvlan_header_ops = {
387 .create = ipvlan_hard_header,
388 .parse = eth_header_parse,
389 .cache = eth_header_cache,
390 .cache_update = eth_header_cache_update,
391 .parse_protocol = eth_header_parse_protocol,
392 };
393
394 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
395 {
396 ipvlan->dev->mtu = dev->mtu;
397 }
398
399 static bool netif_is_ipvlan(const struct net_device *dev)
400 {
401 /* both ipvlan and ipvtap devices use the same netdev_ops */
402 return dev->netdev_ops == &ipvlan_netdev_ops;
403 }
404
405 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
406 struct ethtool_link_ksettings *cmd)
407 {
408 const struct ipvl_dev *ipvlan = netdev_priv(dev);
409
410 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
411 }
412
413 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
414 struct ethtool_drvinfo *drvinfo)
415 {
416 strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
417 strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
418 }
419
420 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
421 {
422 const struct ipvl_dev *ipvlan = netdev_priv(dev);
423
424 return ipvlan->msg_enable;
425 }
426
427 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
428 {
429 struct ipvl_dev *ipvlan = netdev_priv(dev);
430
431 ipvlan->msg_enable = value;
432 }
433
434 static const struct ethtool_ops ipvlan_ethtool_ops = {
435 .get_link = ethtool_op_get_link,
436 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
437 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
438 .get_msglevel = ipvlan_ethtool_get_msglevel,
439 .set_msglevel = ipvlan_ethtool_set_msglevel,
440 };
441
442 static int ipvlan_nl_changelink(struct net_device *dev,
443 struct nlattr *tb[], struct nlattr *data[],
444 struct netlink_ext_ack *extack)
445 {
446 struct ipvl_dev *ipvlan = netdev_priv(dev);
447 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
448 int err = 0;
449
450 if (!data)
451 return 0;
452 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
453 return -EPERM;
454
455 if (data[IFLA_IPVLAN_MODE]) {
456 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
457
458 err = ipvlan_set_port_mode(port, nmode, extack);
459 }
460
461 if (!err && data[IFLA_IPVLAN_FLAGS]) {
462 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
463
464 if (flags & IPVLAN_F_PRIVATE)
465 ipvlan_mark_private(port);
466 else
467 ipvlan_clear_private(port);
468
469 if (flags & IPVLAN_F_VEPA)
470 ipvlan_mark_vepa(port);
471 else
472 ipvlan_clear_vepa(port);
473 }
474
475 return err;
476 }
477
478 static size_t ipvlan_nl_getsize(const struct net_device *dev)
479 {
480 return (0
481 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
482 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
483 );
484 }
485
486 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
487 struct netlink_ext_ack *extack)
488 {
489 if (!data)
490 return 0;
491
492 if (data[IFLA_IPVLAN_MODE]) {
493 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
494
495 if (mode >= IPVLAN_MODE_MAX)
496 return -EINVAL;
497 }
498 if (data[IFLA_IPVLAN_FLAGS]) {
499 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
500
501 /* Only two bits are used at this moment. */
502 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
503 return -EINVAL;
504 /* Also both flags can't be active at the same time. */
505 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
506 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
507 return -EINVAL;
508 }
509
510 return 0;
511 }
512
513 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
514 const struct net_device *dev)
515 {
516 struct ipvl_dev *ipvlan = netdev_priv(dev);
517 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
518 int ret = -EINVAL;
519
520 if (!port)
521 goto err;
522
523 ret = -EMSGSIZE;
524 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
525 goto err;
526 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
527 goto err;
528
529 return 0;
530
531 err:
532 return ret;
533 }
534
535 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
536 struct nlattr *tb[], struct nlattr *data[],
537 struct netlink_ext_ack *extack)
538 {
539 struct ipvl_dev *ipvlan = netdev_priv(dev);
540 struct ipvl_port *port;
541 struct net_device *phy_dev;
542 int err;
543 u16 mode = IPVLAN_MODE_L3;
544
545 if (!tb[IFLA_LINK])
546 return -EINVAL;
547
548 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
549 if (!phy_dev)
550 return -ENODEV;
551
552 if (netif_is_ipvlan(phy_dev)) {
553 struct ipvl_dev *tmp = netdev_priv(phy_dev);
554
555 phy_dev = tmp->phy_dev;
556 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
557 return -EPERM;
558 } else if (!netif_is_ipvlan_port(phy_dev)) {
559 /* Exit early if the underlying link is invalid or busy */
560 if (phy_dev->type != ARPHRD_ETHER ||
561 phy_dev->flags & IFF_LOOPBACK) {
562 netdev_err(phy_dev,
563 "Master is either lo or non-ether device\n");
564 return -EINVAL;
565 }
566
567 if (netdev_is_rx_handler_busy(phy_dev)) {
568 netdev_err(phy_dev, "Device is already in use.\n");
569 return -EBUSY;
570 }
571 }
572
573 ipvlan->phy_dev = phy_dev;
574 ipvlan->dev = dev;
575 ipvlan->sfeatures = IPVLAN_FEATURES;
576 if (!tb[IFLA_MTU])
577 ipvlan_adjust_mtu(ipvlan, phy_dev);
578 INIT_LIST_HEAD(&ipvlan->addrs);
579 spin_lock_init(&ipvlan->addrs_lock);
580
581 /* TODO Probably put random address here to be presented to the
582 * world but keep using the physical-dev address for the outgoing
583 * packets.
584 */
585 eth_hw_addr_set(dev, phy_dev->dev_addr);
586
587 dev->priv_flags |= IFF_NO_RX_HANDLER;
588
589 err = register_netdevice(dev);
590 if (err < 0)
591 return err;
592
593 /* ipvlan_init() would have created the port, if required */
594 port = ipvlan_port_get_rtnl(phy_dev);
595 ipvlan->port = port;
596
597 /* If the port-id base is at the MAX value, then wrap it around and
598 * begin from 0x1 again. This may be due to a busy system where lots
599 * of slaves are getting created and deleted.
600 */
601 if (port->dev_id_start == 0xFFFE)
602 port->dev_id_start = 0x1;
603
604 /* Since L2 address is shared among all IPvlan slaves including
605 * master, use unique 16 bit dev-ids to differentiate among them.
606 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
607 * slave link [see addrconf_ifid_eui48()].
608 */
609 err = ida_alloc_range(&port->ida, port->dev_id_start, 0xFFFD,
610 GFP_KERNEL);
611 if (err < 0)
612 err = ida_alloc_range(&port->ida, 0x1, port->dev_id_start - 1,
613 GFP_KERNEL);
614 if (err < 0)
615 goto unregister_netdev;
616 dev->dev_id = err;
617
618 /* Increment id-base to the next slot for the future assignment */
619 port->dev_id_start = err + 1;
620
621 err = netdev_upper_dev_link(phy_dev, dev, extack);
622 if (err)
623 goto remove_ida;
624
625 /* Flags are per port and latest update overrides. User has
626 * to be consistent in setting it just like the mode attribute.
627 */
628 if (data && data[IFLA_IPVLAN_FLAGS])
629 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
630
631 if (data && data[IFLA_IPVLAN_MODE])
632 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
633
634 err = ipvlan_set_port_mode(port, mode, extack);
635 if (err)
636 goto unlink_netdev;
637
638 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
639 netif_stacked_transfer_operstate(phy_dev, dev);
640 return 0;
641
642 unlink_netdev:
643 netdev_upper_dev_unlink(phy_dev, dev);
644 remove_ida:
645 ida_free(&port->ida, dev->dev_id);
646 unregister_netdev:
647 unregister_netdevice(dev);
648 return err;
649 }
650 EXPORT_SYMBOL_GPL(ipvlan_link_new);
651
652 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
653 {
654 struct ipvl_dev *ipvlan = netdev_priv(dev);
655 struct ipvl_addr *addr, *next;
656
657 spin_lock_bh(&ipvlan->addrs_lock);
658 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
659 ipvlan_ht_addr_del(addr);
660 list_del_rcu(&addr->anode);
661 kfree_rcu(addr, rcu);
662 }
663 spin_unlock_bh(&ipvlan->addrs_lock);
664
665 ida_free(&ipvlan->port->ida, dev->dev_id);
666 list_del_rcu(&ipvlan->pnode);
667 unregister_netdevice_queue(dev, head);
668 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
669 }
670 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
671
672 void ipvlan_link_setup(struct net_device *dev)
673 {
674 ether_setup(dev);
675
676 dev->max_mtu = ETH_MAX_MTU;
677 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
678 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
679 dev->netdev_ops = &ipvlan_netdev_ops;
680 dev->needs_free_netdev = true;
681 dev->header_ops = &ipvlan_header_ops;
682 dev->ethtool_ops = &ipvlan_ethtool_ops;
683 }
684 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
685
686 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
687 {
688 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
689 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
690 };
691
692 static struct net *ipvlan_get_link_net(const struct net_device *dev)
693 {
694 struct ipvl_dev *ipvlan = netdev_priv(dev);
695
696 return dev_net(ipvlan->phy_dev);
697 }
698
699 static struct rtnl_link_ops ipvlan_link_ops = {
700 .kind = "ipvlan",
701 .priv_size = sizeof(struct ipvl_dev),
702
703 .setup = ipvlan_link_setup,
704 .newlink = ipvlan_link_new,
705 .dellink = ipvlan_link_delete,
706 .get_link_net = ipvlan_get_link_net,
707 };
708
709 int ipvlan_link_register(struct rtnl_link_ops *ops)
710 {
711 ops->get_size = ipvlan_nl_getsize;
712 ops->policy = ipvlan_nl_policy;
713 ops->validate = ipvlan_nl_validate;
714 ops->fill_info = ipvlan_nl_fillinfo;
715 ops->changelink = ipvlan_nl_changelink;
716 ops->maxtype = IFLA_IPVLAN_MAX;
717 return rtnl_link_register(ops);
718 }
719 EXPORT_SYMBOL_GPL(ipvlan_link_register);
720
721 static int ipvlan_device_event(struct notifier_block *unused,
722 unsigned long event, void *ptr)
723 {
724 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
725 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
726 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
727 struct ipvl_dev *ipvlan, *next;
728 struct ipvl_port *port;
729 LIST_HEAD(lst_kill);
730 int err;
731
732 if (!netif_is_ipvlan_port(dev))
733 return NOTIFY_DONE;
734
735 port = ipvlan_port_get_rtnl(dev);
736
737 switch (event) {
738 case NETDEV_UP:
739 case NETDEV_DOWN:
740 case NETDEV_CHANGE:
741 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
742 netif_stacked_transfer_operstate(ipvlan->phy_dev,
743 ipvlan->dev);
744 break;
745
746 case NETDEV_REGISTER: {
747 struct net *oldnet, *newnet = dev_net(dev);
748
749 oldnet = read_pnet(&port->pnet);
750 if (net_eq(newnet, oldnet))
751 break;
752
753 write_pnet(&port->pnet, newnet);
754
755 if (port->mode == IPVLAN_MODE_L3S)
756 ipvlan_migrate_l3s_hook(oldnet, newnet);
757 break;
758 }
759 case NETDEV_UNREGISTER:
760 if (dev->reg_state != NETREG_UNREGISTERING)
761 break;
762
763 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
764 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
765 &lst_kill);
766 unregister_netdevice_many(&lst_kill);
767 break;
768
769 case NETDEV_FEAT_CHANGE:
770 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
771 netif_inherit_tso_max(ipvlan->dev, dev);
772 netdev_update_features(ipvlan->dev);
773 }
774 break;
775
776 case NETDEV_CHANGEMTU:
777 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
778 ipvlan_adjust_mtu(ipvlan, dev);
779 break;
780
781 case NETDEV_PRE_CHANGEADDR:
782 prechaddr_info = ptr;
783 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
784 err = dev_pre_changeaddr_notify(ipvlan->dev,
785 prechaddr_info->dev_addr,
786 extack);
787 if (err)
788 return notifier_from_errno(err);
789 }
790 break;
791
792 case NETDEV_CHANGEADDR:
793 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
794 eth_hw_addr_set(ipvlan->dev, dev->dev_addr);
795 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
796 }
797 break;
798
799 case NETDEV_PRE_TYPE_CHANGE:
800 /* Forbid underlying device to change its type. */
801 return NOTIFY_BAD;
802 }
803 return NOTIFY_DONE;
804 }
805
806 /* the caller must held the addrs lock */
807 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
808 {
809 struct ipvl_addr *addr;
810
811 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
812 if (!addr)
813 return -ENOMEM;
814
815 addr->master = ipvlan;
816 if (!is_v6) {
817 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
818 addr->atype = IPVL_IPV4;
819 #if IS_ENABLED(CONFIG_IPV6)
820 } else {
821 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
822 addr->atype = IPVL_IPV6;
823 #endif
824 }
825
826 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
827
828 /* If the interface is not up, the address will be added to the hash
829 * list by ipvlan_open.
830 */
831 if (netif_running(ipvlan->dev))
832 ipvlan_ht_addr_add(ipvlan, addr);
833
834 return 0;
835 }
836
837 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
838 {
839 struct ipvl_addr *addr;
840
841 spin_lock_bh(&ipvlan->addrs_lock);
842 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
843 if (!addr) {
844 spin_unlock_bh(&ipvlan->addrs_lock);
845 return;
846 }
847
848 ipvlan_ht_addr_del(addr);
849 list_del_rcu(&addr->anode);
850 spin_unlock_bh(&ipvlan->addrs_lock);
851 kfree_rcu(addr, rcu);
852 }
853
854 static bool ipvlan_is_valid_dev(const struct net_device *dev)
855 {
856 struct ipvl_dev *ipvlan = netdev_priv(dev);
857
858 if (!netif_is_ipvlan(dev))
859 return false;
860
861 if (!ipvlan || !ipvlan->port)
862 return false;
863
864 return true;
865 }
866
867 #if IS_ENABLED(CONFIG_IPV6)
868 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
869 {
870 int ret = -EINVAL;
871
872 spin_lock_bh(&ipvlan->addrs_lock);
873 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
874 netif_err(ipvlan, ifup, ipvlan->dev,
875 "Failed to add IPv6=%pI6c addr for %s intf\n",
876 ip6_addr, ipvlan->dev->name);
877 else
878 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
879 spin_unlock_bh(&ipvlan->addrs_lock);
880 return ret;
881 }
882
883 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
884 {
885 return ipvlan_del_addr(ipvlan, ip6_addr, true);
886 }
887
888 static int ipvlan_addr6_event(struct notifier_block *unused,
889 unsigned long event, void *ptr)
890 {
891 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
892 struct net_device *dev = (struct net_device *)if6->idev->dev;
893 struct ipvl_dev *ipvlan = netdev_priv(dev);
894
895 if (!ipvlan_is_valid_dev(dev))
896 return NOTIFY_DONE;
897
898 switch (event) {
899 case NETDEV_UP:
900 if (ipvlan_add_addr6(ipvlan, &if6->addr))
901 return NOTIFY_BAD;
902 break;
903
904 case NETDEV_DOWN:
905 ipvlan_del_addr6(ipvlan, &if6->addr);
906 break;
907 }
908
909 return NOTIFY_OK;
910 }
911
912 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
913 unsigned long event, void *ptr)
914 {
915 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
916 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
917 struct ipvl_dev *ipvlan = netdev_priv(dev);
918
919 if (!ipvlan_is_valid_dev(dev))
920 return NOTIFY_DONE;
921
922 switch (event) {
923 case NETDEV_UP:
924 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
925 NL_SET_ERR_MSG(i6vi->extack,
926 "Address already assigned to an ipvlan device");
927 return notifier_from_errno(-EADDRINUSE);
928 }
929 break;
930 }
931
932 return NOTIFY_OK;
933 }
934 #endif
935
936 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
937 {
938 int ret = -EINVAL;
939
940 spin_lock_bh(&ipvlan->addrs_lock);
941 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
942 netif_err(ipvlan, ifup, ipvlan->dev,
943 "Failed to add IPv4=%pI4 on %s intf.\n",
944 ip4_addr, ipvlan->dev->name);
945 else
946 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
947 spin_unlock_bh(&ipvlan->addrs_lock);
948 return ret;
949 }
950
951 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
952 {
953 return ipvlan_del_addr(ipvlan, ip4_addr, false);
954 }
955
956 static int ipvlan_addr4_event(struct notifier_block *unused,
957 unsigned long event, void *ptr)
958 {
959 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
960 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
961 struct ipvl_dev *ipvlan = netdev_priv(dev);
962 struct in_addr ip4_addr;
963
964 if (!ipvlan_is_valid_dev(dev))
965 return NOTIFY_DONE;
966
967 switch (event) {
968 case NETDEV_UP:
969 ip4_addr.s_addr = if4->ifa_address;
970 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
971 return NOTIFY_BAD;
972 break;
973
974 case NETDEV_DOWN:
975 ip4_addr.s_addr = if4->ifa_address;
976 ipvlan_del_addr4(ipvlan, &ip4_addr);
977 break;
978 }
979
980 return NOTIFY_OK;
981 }
982
983 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
984 unsigned long event, void *ptr)
985 {
986 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
987 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
988 struct ipvl_dev *ipvlan = netdev_priv(dev);
989
990 if (!ipvlan_is_valid_dev(dev))
991 return NOTIFY_DONE;
992
993 switch (event) {
994 case NETDEV_UP:
995 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
996 NL_SET_ERR_MSG(ivi->extack,
997 "Address already assigned to an ipvlan device");
998 return notifier_from_errno(-EADDRINUSE);
999 }
1000 break;
1001 }
1002
1003 return NOTIFY_OK;
1004 }
1005
1006 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1007 .notifier_call = ipvlan_addr4_event,
1008 };
1009
1010 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1011 .notifier_call = ipvlan_addr4_validator_event,
1012 };
1013
1014 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1015 .notifier_call = ipvlan_device_event,
1016 };
1017
1018 #if IS_ENABLED(CONFIG_IPV6)
1019 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1020 .notifier_call = ipvlan_addr6_event,
1021 };
1022
1023 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1024 .notifier_call = ipvlan_addr6_validator_event,
1025 };
1026 #endif
1027
1028 static int __init ipvlan_init_module(void)
1029 {
1030 int err;
1031
1032 ipvlan_init_secret();
1033 register_netdevice_notifier(&ipvlan_notifier_block);
1034 #if IS_ENABLED(CONFIG_IPV6)
1035 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1036 register_inet6addr_validator_notifier(
1037 &ipvlan_addr6_vtor_notifier_block);
1038 #endif
1039 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1040 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1041
1042 err = ipvlan_l3s_init();
1043 if (err < 0)
1044 goto error;
1045
1046 err = ipvlan_link_register(&ipvlan_link_ops);
1047 if (err < 0) {
1048 ipvlan_l3s_cleanup();
1049 goto error;
1050 }
1051
1052 return 0;
1053 error:
1054 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1055 unregister_inetaddr_validator_notifier(
1056 &ipvlan_addr4_vtor_notifier_block);
1057 #if IS_ENABLED(CONFIG_IPV6)
1058 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1059 unregister_inet6addr_validator_notifier(
1060 &ipvlan_addr6_vtor_notifier_block);
1061 #endif
1062 unregister_netdevice_notifier(&ipvlan_notifier_block);
1063 return err;
1064 }
1065
1066 static void __exit ipvlan_cleanup_module(void)
1067 {
1068 rtnl_link_unregister(&ipvlan_link_ops);
1069 ipvlan_l3s_cleanup();
1070 unregister_netdevice_notifier(&ipvlan_notifier_block);
1071 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1072 unregister_inetaddr_validator_notifier(
1073 &ipvlan_addr4_vtor_notifier_block);
1074 #if IS_ENABLED(CONFIG_IPV6)
1075 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1076 unregister_inet6addr_validator_notifier(
1077 &ipvlan_addr6_vtor_notifier_block);
1078 #endif
1079 }
1080
1081 module_init(ipvlan_init_module);
1082 module_exit(ipvlan_cleanup_module);
1083
1084 MODULE_LICENSE("GPL");
1085 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1086 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1087 MODULE_ALIAS_RTNL_LINK("ipvlan");
Kernel DRM miscellaneous fixes and cross-tree changes