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WIP FPC-III support
[linux/fpc-iii.git] / drivers / net / ipvlan / ipvlan_main.c
bloba707502a0c0f4aecfaaff6d80b35f29d9b6de5fd
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 return 0;
87
88 err:
89 kfree(port);
90 return err;
91 }
92
93 static void ipvlan_port_destroy(struct net_device *dev)
94 {
95 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
96 struct sk_buff *skb;
97
98 if (port->mode == IPVLAN_MODE_L3S)
99 ipvlan_l3s_unregister(port);
100 netdev_rx_handler_unregister(dev);
101 cancel_work_sync(&port->wq);
102 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
103 if (skb->dev)
104 dev_put(skb->dev);
105 kfree_skb(skb);
106 }
107 ida_destroy(&port->ida);
108 kfree(port);
109 }
110
111 #define IPVLAN_ALWAYS_ON_OFLOADS \
112 (NETIF_F_SG | NETIF_F_HW_CSUM | \
113 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
114
115 #define IPVLAN_ALWAYS_ON \
116 (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED)
117
118 #define IPVLAN_FEATURES \
119 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
120 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
121 NETIF_F_GRO | NETIF_F_RXCSUM | \
122 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
123
124 /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
125
126 #define IPVLAN_STATE_MASK \
127 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
128
129 static int ipvlan_init(struct net_device *dev)
130 {
131 struct ipvl_dev *ipvlan = netdev_priv(dev);
132 struct net_device *phy_dev = ipvlan->phy_dev;
133 struct ipvl_port *port;
134 int err;
135
136 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
137 (phy_dev->state & IPVLAN_STATE_MASK);
138 dev->features = phy_dev->features & IPVLAN_FEATURES;
139 dev->features |= IPVLAN_ALWAYS_ON;
140 dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
141 dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
142 dev->hw_enc_features |= dev->features;
143 dev->gso_max_size = phy_dev->gso_max_size;
144 dev->gso_max_segs = phy_dev->gso_max_segs;
145 dev->hard_header_len = phy_dev->hard_header_len;
146
147 netdev_lockdep_set_classes(dev);
148
149 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
150 if (!ipvlan->pcpu_stats)
151 return -ENOMEM;
152
153 if (!netif_is_ipvlan_port(phy_dev)) {
154 err = ipvlan_port_create(phy_dev);
155 if (err < 0) {
156 free_percpu(ipvlan->pcpu_stats);
157 return err;
158 }
159 }
160 port = ipvlan_port_get_rtnl(phy_dev);
161 port->count += 1;
162 return 0;
163 }
164
165 static void ipvlan_uninit(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_port *port;
170
171 free_percpu(ipvlan->pcpu_stats);
172
173 port = ipvlan_port_get_rtnl(phy_dev);
174 port->count -= 1;
175 if (!port->count)
176 ipvlan_port_destroy(port->dev);
177 }
178
179 static int ipvlan_open(struct net_device *dev)
180 {
181 struct ipvl_dev *ipvlan = netdev_priv(dev);
182 struct ipvl_addr *addr;
183
184 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
185 ipvlan->port->mode == IPVLAN_MODE_L3S)
186 dev->flags |= IFF_NOARP;
187 else
188 dev->flags &= ~IFF_NOARP;
189
190 rcu_read_lock();
191 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
192 ipvlan_ht_addr_add(ipvlan, addr);
193 rcu_read_unlock();
194
195 return 0;
196 }
197
198 static int ipvlan_stop(struct net_device *dev)
199 {
200 struct ipvl_dev *ipvlan = netdev_priv(dev);
201 struct net_device *phy_dev = ipvlan->phy_dev;
202 struct ipvl_addr *addr;
203
204 dev_uc_unsync(phy_dev, dev);
205 dev_mc_unsync(phy_dev, dev);
206
207 rcu_read_lock();
208 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
209 ipvlan_ht_addr_del(addr);
210 rcu_read_unlock();
211
212 return 0;
213 }
214
215 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
216 struct net_device *dev)
217 {
218 const struct ipvl_dev *ipvlan = netdev_priv(dev);
219 int skblen = skb->len;
220 int ret;
221
222 ret = ipvlan_queue_xmit(skb, dev);
223 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
224 struct ipvl_pcpu_stats *pcptr;
225
226 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
227
228 u64_stats_update_begin(&pcptr->syncp);
229 pcptr->tx_pkts++;
230 pcptr->tx_bytes += skblen;
231 u64_stats_update_end(&pcptr->syncp);
232 } else {
233 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
234 }
235 return ret;
236 }
237
238 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
239 netdev_features_t features)
240 {
241 struct ipvl_dev *ipvlan = netdev_priv(dev);
242
243 features |= NETIF_F_ALL_FOR_ALL;
244 features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES);
245 features = netdev_increment_features(ipvlan->phy_dev->features,
246 features, features);
247 features |= IPVLAN_ALWAYS_ON;
248 features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON);
249
250 return features;
251 }
252
253 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
254 {
255 struct ipvl_dev *ipvlan = netdev_priv(dev);
256 struct net_device *phy_dev = ipvlan->phy_dev;
257
258 if (change & IFF_ALLMULTI)
259 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
260 }
261
262 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
263 {
264 struct ipvl_dev *ipvlan = netdev_priv(dev);
265
266 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
267 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
268 } else {
269 struct netdev_hw_addr *ha;
270 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
271
272 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
273 netdev_for_each_mc_addr(ha, dev)
274 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
275
276 /* Turn-on broadcast bit irrespective of address family,
277 * since broadcast is deferred to a work-queue, hence no
278 * impact on fast-path processing.
279 */
280 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
281
282 bitmap_copy(ipvlan->mac_filters, mc_filters,
283 IPVLAN_MAC_FILTER_SIZE);
284 }
285 dev_uc_sync(ipvlan->phy_dev, dev);
286 dev_mc_sync(ipvlan->phy_dev, dev);
287 }
288
289 static void ipvlan_get_stats64(struct net_device *dev,
290 struct rtnl_link_stats64 *s)
291 {
292 struct ipvl_dev *ipvlan = netdev_priv(dev);
293
294 if (ipvlan->pcpu_stats) {
295 struct ipvl_pcpu_stats *pcptr;
296 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
297 u32 rx_errs = 0, tx_drps = 0;
298 u32 strt;
299 int idx;
300
301 for_each_possible_cpu(idx) {
302 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
303 do {
304 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
305 rx_pkts = pcptr->rx_pkts;
306 rx_bytes = pcptr->rx_bytes;
307 rx_mcast = pcptr->rx_mcast;
308 tx_pkts = pcptr->tx_pkts;
309 tx_bytes = pcptr->tx_bytes;
310 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
311 strt));
312
313 s->rx_packets += rx_pkts;
314 s->rx_bytes += rx_bytes;
315 s->multicast += rx_mcast;
316 s->tx_packets += tx_pkts;
317 s->tx_bytes += tx_bytes;
318
319 /* u32 values are updated without syncp protection. */
320 rx_errs += pcptr->rx_errs;
321 tx_drps += pcptr->tx_drps;
322 }
323 s->rx_errors = rx_errs;
324 s->rx_dropped = rx_errs;
325 s->tx_dropped = tx_drps;
326 }
327 }
328
329 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
330 {
331 struct ipvl_dev *ipvlan = netdev_priv(dev);
332 struct net_device *phy_dev = ipvlan->phy_dev;
333
334 return vlan_vid_add(phy_dev, proto, vid);
335 }
336
337 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
338 u16 vid)
339 {
340 struct ipvl_dev *ipvlan = netdev_priv(dev);
341 struct net_device *phy_dev = ipvlan->phy_dev;
342
343 vlan_vid_del(phy_dev, proto, vid);
344 return 0;
345 }
346
347 static int ipvlan_get_iflink(const struct net_device *dev)
348 {
349 struct ipvl_dev *ipvlan = netdev_priv(dev);
350
351 return ipvlan->phy_dev->ifindex;
352 }
353
354 static const struct net_device_ops ipvlan_netdev_ops = {
355 .ndo_init = ipvlan_init,
356 .ndo_uninit = ipvlan_uninit,
357 .ndo_open = ipvlan_open,
358 .ndo_stop = ipvlan_stop,
359 .ndo_start_xmit = ipvlan_start_xmit,
360 .ndo_fix_features = ipvlan_fix_features,
361 .ndo_change_rx_flags = ipvlan_change_rx_flags,
362 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
363 .ndo_get_stats64 = ipvlan_get_stats64,
364 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
365 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
366 .ndo_get_iflink = ipvlan_get_iflink,
367 };
368
369 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
370 unsigned short type, const void *daddr,
371 const void *saddr, unsigned len)
372 {
373 const struct ipvl_dev *ipvlan = netdev_priv(dev);
374 struct net_device *phy_dev = ipvlan->phy_dev;
375
376 /* TODO Probably use a different field than dev_addr so that the
377 * mac-address on the virtual device is portable and can be carried
378 * while the packets use the mac-addr on the physical device.
379 */
380 return dev_hard_header(skb, phy_dev, type, daddr,
381 saddr ? : phy_dev->dev_addr, len);
382 }
383
384 static const struct header_ops ipvlan_header_ops = {
385 .create = ipvlan_hard_header,
386 .parse = eth_header_parse,
387 .cache = eth_header_cache,
388 .cache_update = eth_header_cache_update,
389 };
390
391 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
392 {
393 ipvlan->dev->mtu = dev->mtu;
394 }
395
396 static bool netif_is_ipvlan(const struct net_device *dev)
397 {
398 /* both ipvlan and ipvtap devices use the same netdev_ops */
399 return dev->netdev_ops == &ipvlan_netdev_ops;
400 }
401
402 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
403 struct ethtool_link_ksettings *cmd)
404 {
405 const struct ipvl_dev *ipvlan = netdev_priv(dev);
406
407 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
408 }
409
410 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
411 struct ethtool_drvinfo *drvinfo)
412 {
413 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
414 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
415 }
416
417 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
418 {
419 const struct ipvl_dev *ipvlan = netdev_priv(dev);
420
421 return ipvlan->msg_enable;
422 }
423
424 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
425 {
426 struct ipvl_dev *ipvlan = netdev_priv(dev);
427
428 ipvlan->msg_enable = value;
429 }
430
431 static const struct ethtool_ops ipvlan_ethtool_ops = {
432 .get_link = ethtool_op_get_link,
433 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
434 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
435 .get_msglevel = ipvlan_ethtool_get_msglevel,
436 .set_msglevel = ipvlan_ethtool_set_msglevel,
437 };
438
439 static int ipvlan_nl_changelink(struct net_device *dev,
440 struct nlattr *tb[], struct nlattr *data[],
441 struct netlink_ext_ack *extack)
442 {
443 struct ipvl_dev *ipvlan = netdev_priv(dev);
444 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
445 int err = 0;
446
447 if (!data)
448 return 0;
449 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
450 return -EPERM;
451
452 if (data[IFLA_IPVLAN_MODE]) {
453 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
454
455 err = ipvlan_set_port_mode(port, nmode, extack);
456 }
457
458 if (!err && data[IFLA_IPVLAN_FLAGS]) {
459 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
460
461 if (flags & IPVLAN_F_PRIVATE)
462 ipvlan_mark_private(port);
463 else
464 ipvlan_clear_private(port);
465
466 if (flags & IPVLAN_F_VEPA)
467 ipvlan_mark_vepa(port);
468 else
469 ipvlan_clear_vepa(port);
470 }
471
472 return err;
473 }
474
475 static size_t ipvlan_nl_getsize(const struct net_device *dev)
476 {
477 return (0
478 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
479 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
480 );
481 }
482
483 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
484 struct netlink_ext_ack *extack)
485 {
486 if (!data)
487 return 0;
488
489 if (data[IFLA_IPVLAN_MODE]) {
490 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
491
492 if (mode >= IPVLAN_MODE_MAX)
493 return -EINVAL;
494 }
495 if (data[IFLA_IPVLAN_FLAGS]) {
496 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
497
498 /* Only two bits are used at this moment. */
499 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
500 return -EINVAL;
501 /* Also both flags can't be active at the same time. */
502 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
503 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
504 return -EINVAL;
505 }
506
507 return 0;
508 }
509
510 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
511 const struct net_device *dev)
512 {
513 struct ipvl_dev *ipvlan = netdev_priv(dev);
514 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
515 int ret = -EINVAL;
516
517 if (!port)
518 goto err;
519
520 ret = -EMSGSIZE;
521 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
522 goto err;
523 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
524 goto err;
525
526 return 0;
527
528 err:
529 return ret;
530 }
531
532 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
533 struct nlattr *tb[], struct nlattr *data[],
534 struct netlink_ext_ack *extack)
535 {
536 struct ipvl_dev *ipvlan = netdev_priv(dev);
537 struct ipvl_port *port;
538 struct net_device *phy_dev;
539 int err;
540 u16 mode = IPVLAN_MODE_L3;
541
542 if (!tb[IFLA_LINK])
543 return -EINVAL;
544
545 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
546 if (!phy_dev)
547 return -ENODEV;
548
549 if (netif_is_ipvlan(phy_dev)) {
550 struct ipvl_dev *tmp = netdev_priv(phy_dev);
551
552 phy_dev = tmp->phy_dev;
553 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
554 return -EPERM;
555 } else if (!netif_is_ipvlan_port(phy_dev)) {
556 /* Exit early if the underlying link is invalid or busy */
557 if (phy_dev->type != ARPHRD_ETHER ||
558 phy_dev->flags & IFF_LOOPBACK) {
559 netdev_err(phy_dev,
560 "Master is either lo or non-ether device\n");
561 return -EINVAL;
562 }
563
564 if (netdev_is_rx_handler_busy(phy_dev)) {
565 netdev_err(phy_dev, "Device is already in use.\n");
566 return -EBUSY;
567 }
568 }
569
570 ipvlan->phy_dev = phy_dev;
571 ipvlan->dev = dev;
572 ipvlan->sfeatures = IPVLAN_FEATURES;
573 if (!tb[IFLA_MTU])
574 ipvlan_adjust_mtu(ipvlan, phy_dev);
575 INIT_LIST_HEAD(&ipvlan->addrs);
576 spin_lock_init(&ipvlan->addrs_lock);
577
578 /* TODO Probably put random address here to be presented to the
579 * world but keep using the physical-dev address for the outgoing
580 * packets.
581 */
582 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
583
584 dev->priv_flags |= IFF_NO_RX_HANDLER;
585
586 err = register_netdevice(dev);
587 if (err < 0)
588 return err;
589
590 /* ipvlan_init() would have created the port, if required */
591 port = ipvlan_port_get_rtnl(phy_dev);
592 ipvlan->port = port;
593
594 /* If the port-id base is at the MAX value, then wrap it around and
595 * begin from 0x1 again. This may be due to a busy system where lots
596 * of slaves are getting created and deleted.
597 */
598 if (port->dev_id_start == 0xFFFE)
599 port->dev_id_start = 0x1;
600
601 /* Since L2 address is shared among all IPvlan slaves including
602 * master, use unique 16 bit dev-ids to diffentiate among them.
603 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
604 * slave link [see addrconf_ifid_eui48()].
605 */
606 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
607 GFP_KERNEL);
608 if (err < 0)
609 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
610 GFP_KERNEL);
611 if (err < 0)
612 goto unregister_netdev;
613 dev->dev_id = err;
614
615 /* Increment id-base to the next slot for the future assignment */
616 port->dev_id_start = err + 1;
617
618 err = netdev_upper_dev_link(phy_dev, dev, extack);
619 if (err)
620 goto remove_ida;
621
622 /* Flags are per port and latest update overrides. User has
623 * to be consistent in setting it just like the mode attribute.
624 */
625 if (data && data[IFLA_IPVLAN_FLAGS])
626 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
627
628 if (data && data[IFLA_IPVLAN_MODE])
629 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
630
631 err = ipvlan_set_port_mode(port, mode, extack);
632 if (err)
633 goto unlink_netdev;
634
635 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
636 netif_stacked_transfer_operstate(phy_dev, dev);
637 return 0;
638
639 unlink_netdev:
640 netdev_upper_dev_unlink(phy_dev, dev);
641 remove_ida:
642 ida_simple_remove(&port->ida, dev->dev_id);
643 unregister_netdev:
644 unregister_netdevice(dev);
645 return err;
646 }
647 EXPORT_SYMBOL_GPL(ipvlan_link_new);
648
649 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
650 {
651 struct ipvl_dev *ipvlan = netdev_priv(dev);
652 struct ipvl_addr *addr, *next;
653
654 spin_lock_bh(&ipvlan->addrs_lock);
655 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
656 ipvlan_ht_addr_del(addr);
657 list_del_rcu(&addr->anode);
658 kfree_rcu(addr, rcu);
659 }
660 spin_unlock_bh(&ipvlan->addrs_lock);
661
662 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
663 list_del_rcu(&ipvlan->pnode);
664 unregister_netdevice_queue(dev, head);
665 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
666 }
667 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
668
669 void ipvlan_link_setup(struct net_device *dev)
670 {
671 ether_setup(dev);
672
673 dev->max_mtu = ETH_MAX_MTU;
674 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
675 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
676 dev->netdev_ops = &ipvlan_netdev_ops;
677 dev->needs_free_netdev = true;
678 dev->header_ops = &ipvlan_header_ops;
679 dev->ethtool_ops = &ipvlan_ethtool_ops;
680 }
681 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
682
683 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
684 {
685 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
686 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
687 };
688
689 static struct net *ipvlan_get_link_net(const struct net_device *dev)
690 {
691 struct ipvl_dev *ipvlan = netdev_priv(dev);
692
693 return dev_net(ipvlan->phy_dev);
694 }
695
696 static struct rtnl_link_ops ipvlan_link_ops = {
697 .kind = "ipvlan",
698 .priv_size = sizeof(struct ipvl_dev),
699
700 .setup = ipvlan_link_setup,
701 .newlink = ipvlan_link_new,
702 .dellink = ipvlan_link_delete,
703 .get_link_net = ipvlan_get_link_net,
704 };
705
706 int ipvlan_link_register(struct rtnl_link_ops *ops)
707 {
708 ops->get_size = ipvlan_nl_getsize;
709 ops->policy = ipvlan_nl_policy;
710 ops->validate = ipvlan_nl_validate;
711 ops->fill_info = ipvlan_nl_fillinfo;
712 ops->changelink = ipvlan_nl_changelink;
713 ops->maxtype = IFLA_IPVLAN_MAX;
714 return rtnl_link_register(ops);
715 }
716 EXPORT_SYMBOL_GPL(ipvlan_link_register);
717
718 static int ipvlan_device_event(struct notifier_block *unused,
719 unsigned long event, void *ptr)
720 {
721 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
722 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
723 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
724 struct ipvl_dev *ipvlan, *next;
725 struct ipvl_port *port;
726 LIST_HEAD(lst_kill);
727 int err;
728
729 if (!netif_is_ipvlan_port(dev))
730 return NOTIFY_DONE;
731
732 port = ipvlan_port_get_rtnl(dev);
733
734 switch (event) {
735 case NETDEV_CHANGE:
736 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
737 netif_stacked_transfer_operstate(ipvlan->phy_dev,
738 ipvlan->dev);
739 break;
740
741 case NETDEV_REGISTER: {
742 struct net *oldnet, *newnet = dev_net(dev);
743
744 oldnet = read_pnet(&port->pnet);
745 if (net_eq(newnet, oldnet))
746 break;
747
748 write_pnet(&port->pnet, newnet);
749
750 ipvlan_migrate_l3s_hook(oldnet, newnet);
751 break;
752 }
753 case NETDEV_UNREGISTER:
754 if (dev->reg_state != NETREG_UNREGISTERING)
755 break;
756
757 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
758 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
759 &lst_kill);
760 unregister_netdevice_many(&lst_kill);
761 break;
762
763 case NETDEV_FEAT_CHANGE:
764 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
765 ipvlan->dev->gso_max_size = dev->gso_max_size;
766 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
767 netdev_update_features(ipvlan->dev);
768 }
769 break;
770
771 case NETDEV_CHANGEMTU:
772 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
773 ipvlan_adjust_mtu(ipvlan, dev);
774 break;
775
776 case NETDEV_PRE_CHANGEADDR:
777 prechaddr_info = ptr;
778 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
779 err = dev_pre_changeaddr_notify(ipvlan->dev,
780 prechaddr_info->dev_addr,
781 extack);
782 if (err)
783 return notifier_from_errno(err);
784 }
785 break;
786
787 case NETDEV_CHANGEADDR:
788 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
789 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
790 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
791 }
792 break;
793
794 case NETDEV_PRE_TYPE_CHANGE:
795 /* Forbid underlying device to change its type. */
796 return NOTIFY_BAD;
797 }
798 return NOTIFY_DONE;
799 }
800
801 /* the caller must held the addrs lock */
802 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
803 {
804 struct ipvl_addr *addr;
805
806 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
807 if (!addr)
808 return -ENOMEM;
809
810 addr->master = ipvlan;
811 if (!is_v6) {
812 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
813 addr->atype = IPVL_IPV4;
814 #if IS_ENABLED(CONFIG_IPV6)
815 } else {
816 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
817 addr->atype = IPVL_IPV6;
818 #endif
819 }
820
821 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
822
823 /* If the interface is not up, the address will be added to the hash
824 * list by ipvlan_open.
825 */
826 if (netif_running(ipvlan->dev))
827 ipvlan_ht_addr_add(ipvlan, addr);
828
829 return 0;
830 }
831
832 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
833 {
834 struct ipvl_addr *addr;
835
836 spin_lock_bh(&ipvlan->addrs_lock);
837 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
838 if (!addr) {
839 spin_unlock_bh(&ipvlan->addrs_lock);
840 return;
841 }
842
843 ipvlan_ht_addr_del(addr);
844 list_del_rcu(&addr->anode);
845 spin_unlock_bh(&ipvlan->addrs_lock);
846 kfree_rcu(addr, rcu);
847 }
848
849 static bool ipvlan_is_valid_dev(const struct net_device *dev)
850 {
851 struct ipvl_dev *ipvlan = netdev_priv(dev);
852
853 if (!netif_is_ipvlan(dev))
854 return false;
855
856 if (!ipvlan || !ipvlan->port)
857 return false;
858
859 return true;
860 }
861
862 #if IS_ENABLED(CONFIG_IPV6)
863 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
864 {
865 int ret = -EINVAL;
866
867 spin_lock_bh(&ipvlan->addrs_lock);
868 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
869 netif_err(ipvlan, ifup, ipvlan->dev,
870 "Failed to add IPv6=%pI6c addr for %s intf\n",
871 ip6_addr, ipvlan->dev->name);
872 else
873 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
874 spin_unlock_bh(&ipvlan->addrs_lock);
875 return ret;
876 }
877
878 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
879 {
880 return ipvlan_del_addr(ipvlan, ip6_addr, true);
881 }
882
883 static int ipvlan_addr6_event(struct notifier_block *unused,
884 unsigned long event, void *ptr)
885 {
886 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
887 struct net_device *dev = (struct net_device *)if6->idev->dev;
888 struct ipvl_dev *ipvlan = netdev_priv(dev);
889
890 if (!ipvlan_is_valid_dev(dev))
891 return NOTIFY_DONE;
892
893 switch (event) {
894 case NETDEV_UP:
895 if (ipvlan_add_addr6(ipvlan, &if6->addr))
896 return NOTIFY_BAD;
897 break;
898
899 case NETDEV_DOWN:
900 ipvlan_del_addr6(ipvlan, &if6->addr);
901 break;
902 }
903
904 return NOTIFY_OK;
905 }
906
907 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
908 unsigned long event, void *ptr)
909 {
910 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
911 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
912 struct ipvl_dev *ipvlan = netdev_priv(dev);
913
914 if (!ipvlan_is_valid_dev(dev))
915 return NOTIFY_DONE;
916
917 switch (event) {
918 case NETDEV_UP:
919 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
920 NL_SET_ERR_MSG(i6vi->extack,
921 "Address already assigned to an ipvlan device");
922 return notifier_from_errno(-EADDRINUSE);
923 }
924 break;
925 }
926
927 return NOTIFY_OK;
928 }
929 #endif
930
931 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
932 {
933 int ret = -EINVAL;
934
935 spin_lock_bh(&ipvlan->addrs_lock);
936 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
937 netif_err(ipvlan, ifup, ipvlan->dev,
938 "Failed to add IPv4=%pI4 on %s intf.\n",
939 ip4_addr, ipvlan->dev->name);
940 else
941 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
942 spin_unlock_bh(&ipvlan->addrs_lock);
943 return ret;
944 }
945
946 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
947 {
948 return ipvlan_del_addr(ipvlan, ip4_addr, false);
949 }
950
951 static int ipvlan_addr4_event(struct notifier_block *unused,
952 unsigned long event, void *ptr)
953 {
954 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
955 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
956 struct ipvl_dev *ipvlan = netdev_priv(dev);
957 struct in_addr ip4_addr;
958
959 if (!ipvlan_is_valid_dev(dev))
960 return NOTIFY_DONE;
961
962 switch (event) {
963 case NETDEV_UP:
964 ip4_addr.s_addr = if4->ifa_address;
965 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
966 return NOTIFY_BAD;
967 break;
968
969 case NETDEV_DOWN:
970 ip4_addr.s_addr = if4->ifa_address;
971 ipvlan_del_addr4(ipvlan, &ip4_addr);
972 break;
973 }
974
975 return NOTIFY_OK;
976 }
977
978 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
979 unsigned long event, void *ptr)
980 {
981 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
982 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
983 struct ipvl_dev *ipvlan = netdev_priv(dev);
984
985 if (!ipvlan_is_valid_dev(dev))
986 return NOTIFY_DONE;
987
988 switch (event) {
989 case NETDEV_UP:
990 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
991 NL_SET_ERR_MSG(ivi->extack,
992 "Address already assigned to an ipvlan device");
993 return notifier_from_errno(-EADDRINUSE);
994 }
995 break;
996 }
997
998 return NOTIFY_OK;
999 }
1000
1001 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1002 .notifier_call = ipvlan_addr4_event,
1003 };
1004
1005 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1006 .notifier_call = ipvlan_addr4_validator_event,
1007 };
1008
1009 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1010 .notifier_call = ipvlan_device_event,
1011 };
1012
1013 #if IS_ENABLED(CONFIG_IPV6)
1014 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1015 .notifier_call = ipvlan_addr6_event,
1016 };
1017
1018 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1019 .notifier_call = ipvlan_addr6_validator_event,
1020 };
1021 #endif
1022
1023 static int __init ipvlan_init_module(void)
1024 {
1025 int err;
1026
1027 ipvlan_init_secret();
1028 register_netdevice_notifier(&ipvlan_notifier_block);
1029 #if IS_ENABLED(CONFIG_IPV6)
1030 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1031 register_inet6addr_validator_notifier(
1032 &ipvlan_addr6_vtor_notifier_block);
1033 #endif
1034 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1035 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1036
1037 err = ipvlan_l3s_init();
1038 if (err < 0)
1039 goto error;
1040
1041 err = ipvlan_link_register(&ipvlan_link_ops);
1042 if (err < 0) {
1043 ipvlan_l3s_cleanup();
1044 goto error;
1045 }
1046
1047 return 0;
1048 error:
1049 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1050 unregister_inetaddr_validator_notifier(
1051 &ipvlan_addr4_vtor_notifier_block);
1052 #if IS_ENABLED(CONFIG_IPV6)
1053 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1054 unregister_inet6addr_validator_notifier(
1055 &ipvlan_addr6_vtor_notifier_block);
1056 #endif
1057 unregister_netdevice_notifier(&ipvlan_notifier_block);
1058 return err;
1059 }
1060
1061 static void __exit ipvlan_cleanup_module(void)
1062 {
1063 rtnl_link_unregister(&ipvlan_link_ops);
1064 ipvlan_l3s_cleanup();
1065 unregister_netdevice_notifier(&ipvlan_notifier_block);
1066 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1067 unregister_inetaddr_validator_notifier(
1068 &ipvlan_addr4_vtor_notifier_block);
1069 #if IS_ENABLED(CONFIG_IPV6)
1070 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1071 unregister_inet6addr_validator_notifier(
1072 &ipvlan_addr6_vtor_notifier_block);
1073 #endif
1074 }
1075
1076 module_init(ipvlan_init_module);
1077 module_exit(ipvlan_cleanup_module);
1078
1079 MODULE_LICENSE("GPL");
1080 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1081 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1082 MODULE_ALIAS_RTNL_LINK("ipvlan");
Linux with added FPC-III support