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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / drivers / net / ipvlan / ipvlan_main.c
blob4a949569ec4c51668fe7b795caef7ece5d61854b
1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License as
5 * published by the Free Software Foundation; either version 2 of
6 * the License, or (at your option) any later version.
7 *
8 */
9
10 #include "ipvlan.h"
11
12 static unsigned int ipvlan_netid __read_mostly;
13
14 struct ipvlan_netns {
15 unsigned int ipvl_nf_hook_refcnt;
16 };
17
18 static const struct nf_hook_ops ipvl_nfops[] = {
19 {
20 .hook = ipvlan_nf_input,
21 .pf = NFPROTO_IPV4,
22 .hooknum = NF_INET_LOCAL_IN,
23 .priority = INT_MAX,
24 },
25 #if IS_ENABLED(CONFIG_IPV6)
26 {
27 .hook = ipvlan_nf_input,
28 .pf = NFPROTO_IPV6,
29 .hooknum = NF_INET_LOCAL_IN,
30 .priority = INT_MAX,
31 },
32 #endif
33 };
34
35 static const struct l3mdev_ops ipvl_l3mdev_ops = {
36 .l3mdev_l3_rcv = ipvlan_l3_rcv,
37 };
38
39 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
40 {
41 ipvlan->dev->mtu = dev->mtu;
42 }
43
44 static int ipvlan_register_nf_hook(struct net *net)
45 {
46 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
47 int err = 0;
48
49 if (!vnet->ipvl_nf_hook_refcnt) {
50 err = nf_register_net_hooks(net, ipvl_nfops,
51 ARRAY_SIZE(ipvl_nfops));
52 if (!err)
53 vnet->ipvl_nf_hook_refcnt = 1;
54 } else {
55 vnet->ipvl_nf_hook_refcnt++;
56 }
57
58 return err;
59 }
60
61 static void ipvlan_unregister_nf_hook(struct net *net)
62 {
63 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
64
65 if (WARN_ON(!vnet->ipvl_nf_hook_refcnt))
66 return;
67
68 vnet->ipvl_nf_hook_refcnt--;
69 if (!vnet->ipvl_nf_hook_refcnt)
70 nf_unregister_net_hooks(net, ipvl_nfops,
71 ARRAY_SIZE(ipvl_nfops));
72 }
73
74 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval)
75 {
76 struct ipvl_dev *ipvlan;
77 struct net_device *mdev = port->dev;
78 unsigned int flags;
79 int err;
80
81 ASSERT_RTNL();
82 if (port->mode != nval) {
83 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
84 flags = ipvlan->dev->flags;
85 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
86 err = dev_change_flags(ipvlan->dev,
87 flags | IFF_NOARP);
88 } else {
89 err = dev_change_flags(ipvlan->dev,
90 flags & ~IFF_NOARP);
91 }
92 if (unlikely(err))
93 goto fail;
94 }
95 if (nval == IPVLAN_MODE_L3S) {
96 /* New mode is L3S */
97 err = ipvlan_register_nf_hook(read_pnet(&port->pnet));
98 if (!err) {
99 mdev->l3mdev_ops = &ipvl_l3mdev_ops;
100 mdev->priv_flags |= IFF_L3MDEV_MASTER;
101 } else
102 goto fail;
103 } else if (port->mode == IPVLAN_MODE_L3S) {
104 /* Old mode was L3S */
105 mdev->priv_flags &= ~IFF_L3MDEV_MASTER;
106 ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
107 mdev->l3mdev_ops = NULL;
108 }
109 port->mode = nval;
110 }
111 return 0;
112
113 fail:
114 /* Undo the flags changes that have been done so far. */
115 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
116 flags = ipvlan->dev->flags;
117 if (port->mode == IPVLAN_MODE_L3 ||
118 port->mode == IPVLAN_MODE_L3S)
119 dev_change_flags(ipvlan->dev, flags | IFF_NOARP);
120 else
121 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP);
122 }
123
124 return err;
125 }
126
127 static int ipvlan_port_create(struct net_device *dev)
128 {
129 struct ipvl_port *port;
130 int err, idx;
131
132 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
133 if (!port)
134 return -ENOMEM;
135
136 write_pnet(&port->pnet, dev_net(dev));
137 port->dev = dev;
138 port->mode = IPVLAN_MODE_L3;
139 INIT_LIST_HEAD(&port->ipvlans);
140 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
141 INIT_HLIST_HEAD(&port->hlhead[idx]);
142
143 skb_queue_head_init(&port->backlog);
144 INIT_WORK(&port->wq, ipvlan_process_multicast);
145 ida_init(&port->ida);
146 port->dev_id_start = 1;
147
148 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
149 if (err)
150 goto err;
151
152 return 0;
153
154 err:
155 kfree(port);
156 return err;
157 }
158
159 static void ipvlan_port_destroy(struct net_device *dev)
160 {
161 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
162 struct sk_buff *skb;
163
164 if (port->mode == IPVLAN_MODE_L3S) {
165 dev->priv_flags &= ~IFF_L3MDEV_MASTER;
166 ipvlan_unregister_nf_hook(dev_net(dev));
167 dev->l3mdev_ops = NULL;
168 }
169 netdev_rx_handler_unregister(dev);
170 cancel_work_sync(&port->wq);
171 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
172 if (skb->dev)
173 dev_put(skb->dev);
174 kfree_skb(skb);
175 }
176 ida_destroy(&port->ida);
177 kfree(port);
178 }
179
180 #define IPVLAN_FEATURES \
181 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
182 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
183 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
184 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
185
186 #define IPVLAN_STATE_MASK \
187 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
188
189 static int ipvlan_init(struct net_device *dev)
190 {
191 struct ipvl_dev *ipvlan = netdev_priv(dev);
192 struct net_device *phy_dev = ipvlan->phy_dev;
193 struct ipvl_port *port;
194 int err;
195
196 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
197 (phy_dev->state & IPVLAN_STATE_MASK);
198 dev->features = phy_dev->features & IPVLAN_FEATURES;
199 dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
200 dev->gso_max_size = phy_dev->gso_max_size;
201 dev->gso_max_segs = phy_dev->gso_max_segs;
202 dev->hard_header_len = phy_dev->hard_header_len;
203
204 netdev_lockdep_set_classes(dev);
205
206 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
207 if (!ipvlan->pcpu_stats)
208 return -ENOMEM;
209
210 if (!netif_is_ipvlan_port(phy_dev)) {
211 err = ipvlan_port_create(phy_dev);
212 if (err < 0) {
213 free_percpu(ipvlan->pcpu_stats);
214 return err;
215 }
216 }
217 port = ipvlan_port_get_rtnl(phy_dev);
218 port->count += 1;
219 return 0;
220 }
221
222 static void ipvlan_uninit(struct net_device *dev)
223 {
224 struct ipvl_dev *ipvlan = netdev_priv(dev);
225 struct net_device *phy_dev = ipvlan->phy_dev;
226 struct ipvl_port *port;
227
228 free_percpu(ipvlan->pcpu_stats);
229
230 port = ipvlan_port_get_rtnl(phy_dev);
231 port->count -= 1;
232 if (!port->count)
233 ipvlan_port_destroy(port->dev);
234 }
235
236 static int ipvlan_open(struct net_device *dev)
237 {
238 struct ipvl_dev *ipvlan = netdev_priv(dev);
239 struct net_device *phy_dev = ipvlan->phy_dev;
240 struct ipvl_addr *addr;
241
242 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
243 ipvlan->port->mode == IPVLAN_MODE_L3S)
244 dev->flags |= IFF_NOARP;
245 else
246 dev->flags &= ~IFF_NOARP;
247
248 rcu_read_lock();
249 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
250 ipvlan_ht_addr_add(ipvlan, addr);
251 rcu_read_unlock();
252
253 return dev_uc_add(phy_dev, phy_dev->dev_addr);
254 }
255
256 static int ipvlan_stop(struct net_device *dev)
257 {
258 struct ipvl_dev *ipvlan = netdev_priv(dev);
259 struct net_device *phy_dev = ipvlan->phy_dev;
260 struct ipvl_addr *addr;
261
262 dev_uc_unsync(phy_dev, dev);
263 dev_mc_unsync(phy_dev, dev);
264
265 dev_uc_del(phy_dev, phy_dev->dev_addr);
266
267 rcu_read_lock();
268 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
269 ipvlan_ht_addr_del(addr);
270 rcu_read_unlock();
271
272 return 0;
273 }
274
275 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
276 struct net_device *dev)
277 {
278 const struct ipvl_dev *ipvlan = netdev_priv(dev);
279 int skblen = skb->len;
280 int ret;
281
282 ret = ipvlan_queue_xmit(skb, dev);
283 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
284 struct ipvl_pcpu_stats *pcptr;
285
286 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
287
288 u64_stats_update_begin(&pcptr->syncp);
289 pcptr->tx_pkts++;
290 pcptr->tx_bytes += skblen;
291 u64_stats_update_end(&pcptr->syncp);
292 } else {
293 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
294 }
295 return ret;
296 }
297
298 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
299 netdev_features_t features)
300 {
301 struct ipvl_dev *ipvlan = netdev_priv(dev);
302
303 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
304 }
305
306 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
307 {
308 struct ipvl_dev *ipvlan = netdev_priv(dev);
309 struct net_device *phy_dev = ipvlan->phy_dev;
310
311 if (change & IFF_ALLMULTI)
312 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
313 }
314
315 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
316 {
317 struct ipvl_dev *ipvlan = netdev_priv(dev);
318
319 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
320 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
321 } else {
322 struct netdev_hw_addr *ha;
323 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
324
325 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
326 netdev_for_each_mc_addr(ha, dev)
327 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
328
329 /* Turn-on broadcast bit irrespective of address family,
330 * since broadcast is deferred to a work-queue, hence no
331 * impact on fast-path processing.
332 */
333 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
334
335 bitmap_copy(ipvlan->mac_filters, mc_filters,
336 IPVLAN_MAC_FILTER_SIZE);
337 }
338 dev_uc_sync(ipvlan->phy_dev, dev);
339 dev_mc_sync(ipvlan->phy_dev, dev);
340 }
341
342 static void ipvlan_get_stats64(struct net_device *dev,
343 struct rtnl_link_stats64 *s)
344 {
345 struct ipvl_dev *ipvlan = netdev_priv(dev);
346
347 if (ipvlan->pcpu_stats) {
348 struct ipvl_pcpu_stats *pcptr;
349 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
350 u32 rx_errs = 0, tx_drps = 0;
351 u32 strt;
352 int idx;
353
354 for_each_possible_cpu(idx) {
355 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
356 do {
357 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
358 rx_pkts = pcptr->rx_pkts;
359 rx_bytes = pcptr->rx_bytes;
360 rx_mcast = pcptr->rx_mcast;
361 tx_pkts = pcptr->tx_pkts;
362 tx_bytes = pcptr->tx_bytes;
363 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
364 strt));
365
366 s->rx_packets += rx_pkts;
367 s->rx_bytes += rx_bytes;
368 s->multicast += rx_mcast;
369 s->tx_packets += tx_pkts;
370 s->tx_bytes += tx_bytes;
371
372 /* u32 values are updated without syncp protection. */
373 rx_errs += pcptr->rx_errs;
374 tx_drps += pcptr->tx_drps;
375 }
376 s->rx_errors = rx_errs;
377 s->rx_dropped = rx_errs;
378 s->tx_dropped = tx_drps;
379 }
380 }
381
382 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
383 {
384 struct ipvl_dev *ipvlan = netdev_priv(dev);
385 struct net_device *phy_dev = ipvlan->phy_dev;
386
387 return vlan_vid_add(phy_dev, proto, vid);
388 }
389
390 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
391 u16 vid)
392 {
393 struct ipvl_dev *ipvlan = netdev_priv(dev);
394 struct net_device *phy_dev = ipvlan->phy_dev;
395
396 vlan_vid_del(phy_dev, proto, vid);
397 return 0;
398 }
399
400 static int ipvlan_get_iflink(const struct net_device *dev)
401 {
402 struct ipvl_dev *ipvlan = netdev_priv(dev);
403
404 return ipvlan->phy_dev->ifindex;
405 }
406
407 static const struct net_device_ops ipvlan_netdev_ops = {
408 .ndo_init = ipvlan_init,
409 .ndo_uninit = ipvlan_uninit,
410 .ndo_open = ipvlan_open,
411 .ndo_stop = ipvlan_stop,
412 .ndo_start_xmit = ipvlan_start_xmit,
413 .ndo_fix_features = ipvlan_fix_features,
414 .ndo_change_rx_flags = ipvlan_change_rx_flags,
415 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
416 .ndo_get_stats64 = ipvlan_get_stats64,
417 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
418 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
419 .ndo_get_iflink = ipvlan_get_iflink,
420 };
421
422 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
423 unsigned short type, const void *daddr,
424 const void *saddr, unsigned len)
425 {
426 const struct ipvl_dev *ipvlan = netdev_priv(dev);
427 struct net_device *phy_dev = ipvlan->phy_dev;
428
429 /* TODO Probably use a different field than dev_addr so that the
430 * mac-address on the virtual device is portable and can be carried
431 * while the packets use the mac-addr on the physical device.
432 */
433 return dev_hard_header(skb, phy_dev, type, daddr,
434 saddr ? : phy_dev->dev_addr, len);
435 }
436
437 static const struct header_ops ipvlan_header_ops = {
438 .create = ipvlan_hard_header,
439 .parse = eth_header_parse,
440 .cache = eth_header_cache,
441 .cache_update = eth_header_cache_update,
442 };
443
444 static bool netif_is_ipvlan(const struct net_device *dev)
445 {
446 /* both ipvlan and ipvtap devices use the same netdev_ops */
447 return dev->netdev_ops == &ipvlan_netdev_ops;
448 }
449
450 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
451 struct ethtool_link_ksettings *cmd)
452 {
453 const struct ipvl_dev *ipvlan = netdev_priv(dev);
454
455 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
456 }
457
458 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
459 struct ethtool_drvinfo *drvinfo)
460 {
461 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
462 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
463 }
464
465 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
466 {
467 const struct ipvl_dev *ipvlan = netdev_priv(dev);
468
469 return ipvlan->msg_enable;
470 }
471
472 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
473 {
474 struct ipvl_dev *ipvlan = netdev_priv(dev);
475
476 ipvlan->msg_enable = value;
477 }
478
479 static const struct ethtool_ops ipvlan_ethtool_ops = {
480 .get_link = ethtool_op_get_link,
481 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
482 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
483 .get_msglevel = ipvlan_ethtool_get_msglevel,
484 .set_msglevel = ipvlan_ethtool_set_msglevel,
485 };
486
487 static int ipvlan_nl_changelink(struct net_device *dev,
488 struct nlattr *tb[], struct nlattr *data[],
489 struct netlink_ext_ack *extack)
490 {
491 struct ipvl_dev *ipvlan = netdev_priv(dev);
492 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
493 int err = 0;
494
495 if (!data)
496 return 0;
497
498 if (data[IFLA_IPVLAN_MODE]) {
499 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
500
501 err = ipvlan_set_port_mode(port, nmode);
502 }
503
504 if (!err && data[IFLA_IPVLAN_FLAGS]) {
505 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
506
507 if (flags & IPVLAN_F_PRIVATE)
508 ipvlan_mark_private(port);
509 else
510 ipvlan_clear_private(port);
511
512 if (flags & IPVLAN_F_VEPA)
513 ipvlan_mark_vepa(port);
514 else
515 ipvlan_clear_vepa(port);
516 }
517
518 return err;
519 }
520
521 static size_t ipvlan_nl_getsize(const struct net_device *dev)
522 {
523 return (0
524 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
525 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
526 );
527 }
528
529 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
530 struct netlink_ext_ack *extack)
531 {
532 if (!data)
533 return 0;
534
535 if (data[IFLA_IPVLAN_MODE]) {
536 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
537
538 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
539 return -EINVAL;
540 }
541 if (data[IFLA_IPVLAN_FLAGS]) {
542 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
543
544 /* Only two bits are used at this moment. */
545 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
546 return -EINVAL;
547 /* Also both flags can't be active at the same time. */
548 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
549 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
550 return -EINVAL;
551 }
552
553 return 0;
554 }
555
556 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
557 const struct net_device *dev)
558 {
559 struct ipvl_dev *ipvlan = netdev_priv(dev);
560 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
561 int ret = -EINVAL;
562
563 if (!port)
564 goto err;
565
566 ret = -EMSGSIZE;
567 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
568 goto err;
569 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
570 goto err;
571
572 return 0;
573
574 err:
575 return ret;
576 }
577
578 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
579 struct nlattr *tb[], struct nlattr *data[],
580 struct netlink_ext_ack *extack)
581 {
582 struct ipvl_dev *ipvlan = netdev_priv(dev);
583 struct ipvl_port *port;
584 struct net_device *phy_dev;
585 int err;
586 u16 mode = IPVLAN_MODE_L3;
587
588 if (!tb[IFLA_LINK])
589 return -EINVAL;
590
591 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
592 if (!phy_dev)
593 return -ENODEV;
594
595 if (netif_is_ipvlan(phy_dev)) {
596 struct ipvl_dev *tmp = netdev_priv(phy_dev);
597
598 phy_dev = tmp->phy_dev;
599 } else if (!netif_is_ipvlan_port(phy_dev)) {
600 /* Exit early if the underlying link is invalid or busy */
601 if (phy_dev->type != ARPHRD_ETHER ||
602 phy_dev->flags & IFF_LOOPBACK) {
603 netdev_err(phy_dev,
604 "Master is either lo or non-ether device\n");
605 return -EINVAL;
606 }
607
608 if (netdev_is_rx_handler_busy(phy_dev)) {
609 netdev_err(phy_dev, "Device is already in use.\n");
610 return -EBUSY;
611 }
612 }
613
614 ipvlan->phy_dev = phy_dev;
615 ipvlan->dev = dev;
616 ipvlan->sfeatures = IPVLAN_FEATURES;
617 if (!tb[IFLA_MTU])
618 ipvlan_adjust_mtu(ipvlan, phy_dev);
619 INIT_LIST_HEAD(&ipvlan->addrs);
620 spin_lock_init(&ipvlan->addrs_lock);
621
622 /* TODO Probably put random address here to be presented to the
623 * world but keep using the physical-dev address for the outgoing
624 * packets.
625 */
626 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
627
628 dev->priv_flags |= IFF_NO_RX_HANDLER;
629
630 err = register_netdevice(dev);
631 if (err < 0)
632 return err;
633
634 /* ipvlan_init() would have created the port, if required */
635 port = ipvlan_port_get_rtnl(phy_dev);
636 ipvlan->port = port;
637
638 /* If the port-id base is at the MAX value, then wrap it around and
639 * begin from 0x1 again. This may be due to a busy system where lots
640 * of slaves are getting created and deleted.
641 */
642 if (port->dev_id_start == 0xFFFE)
643 port->dev_id_start = 0x1;
644
645 /* Since L2 address is shared among all IPvlan slaves including
646 * master, use unique 16 bit dev-ids to diffentiate among them.
647 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
648 * slave link [see addrconf_ifid_eui48()].
649 */
650 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
651 GFP_KERNEL);
652 if (err < 0)
653 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
654 GFP_KERNEL);
655 if (err < 0)
656 goto unregister_netdev;
657 dev->dev_id = err;
658
659 /* Increment id-base to the next slot for the future assignment */
660 port->dev_id_start = err + 1;
661
662 err = netdev_upper_dev_link(phy_dev, dev, extack);
663 if (err)
664 goto remove_ida;
665
666 /* Flags are per port and latest update overrides. User has
667 * to be consistent in setting it just like the mode attribute.
668 */
669 if (data && data[IFLA_IPVLAN_FLAGS])
670 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
671
672 if (data && data[IFLA_IPVLAN_MODE])
673 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
674
675 err = ipvlan_set_port_mode(port, mode);
676 if (err)
677 goto unlink_netdev;
678
679 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
680 netif_stacked_transfer_operstate(phy_dev, dev);
681 return 0;
682
683 unlink_netdev:
684 netdev_upper_dev_unlink(phy_dev, dev);
685 remove_ida:
686 ida_simple_remove(&port->ida, dev->dev_id);
687 unregister_netdev:
688 unregister_netdevice(dev);
689 return err;
690 }
691 EXPORT_SYMBOL_GPL(ipvlan_link_new);
692
693 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
694 {
695 struct ipvl_dev *ipvlan = netdev_priv(dev);
696 struct ipvl_addr *addr, *next;
697
698 spin_lock_bh(&ipvlan->addrs_lock);
699 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
700 ipvlan_ht_addr_del(addr);
701 list_del_rcu(&addr->anode);
702 kfree_rcu(addr, rcu);
703 }
704 spin_unlock_bh(&ipvlan->addrs_lock);
705
706 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
707 list_del_rcu(&ipvlan->pnode);
708 unregister_netdevice_queue(dev, head);
709 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
710 }
711 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
712
713 void ipvlan_link_setup(struct net_device *dev)
714 {
715 ether_setup(dev);
716
717 dev->max_mtu = ETH_MAX_MTU;
718 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
719 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
720 dev->netdev_ops = &ipvlan_netdev_ops;
721 dev->needs_free_netdev = true;
722 dev->header_ops = &ipvlan_header_ops;
723 dev->ethtool_ops = &ipvlan_ethtool_ops;
724 }
725 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
726
727 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
728 {
729 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
730 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
731 };
732
733 static struct rtnl_link_ops ipvlan_link_ops = {
734 .kind = "ipvlan",
735 .priv_size = sizeof(struct ipvl_dev),
736
737 .setup = ipvlan_link_setup,
738 .newlink = ipvlan_link_new,
739 .dellink = ipvlan_link_delete,
740 };
741
742 int ipvlan_link_register(struct rtnl_link_ops *ops)
743 {
744 ops->get_size = ipvlan_nl_getsize;
745 ops->policy = ipvlan_nl_policy;
746 ops->validate = ipvlan_nl_validate;
747 ops->fill_info = ipvlan_nl_fillinfo;
748 ops->changelink = ipvlan_nl_changelink;
749 ops->maxtype = IFLA_IPVLAN_MAX;
750 return rtnl_link_register(ops);
751 }
752 EXPORT_SYMBOL_GPL(ipvlan_link_register);
753
754 static int ipvlan_device_event(struct notifier_block *unused,
755 unsigned long event, void *ptr)
756 {
757 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
758 struct ipvl_dev *ipvlan, *next;
759 struct ipvl_port *port;
760 LIST_HEAD(lst_kill);
761
762 if (!netif_is_ipvlan_port(dev))
763 return NOTIFY_DONE;
764
765 port = ipvlan_port_get_rtnl(dev);
766
767 switch (event) {
768 case NETDEV_CHANGE:
769 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
770 netif_stacked_transfer_operstate(ipvlan->phy_dev,
771 ipvlan->dev);
772 break;
773
774 case NETDEV_REGISTER: {
775 struct net *oldnet, *newnet = dev_net(dev);
776 struct ipvlan_netns *old_vnet;
777
778 oldnet = read_pnet(&port->pnet);
779 if (net_eq(newnet, oldnet))
780 break;
781
782 write_pnet(&port->pnet, newnet);
783
784 old_vnet = net_generic(oldnet, ipvlan_netid);
785 if (!old_vnet->ipvl_nf_hook_refcnt)
786 break;
787
788 ipvlan_register_nf_hook(newnet);
789 ipvlan_unregister_nf_hook(oldnet);
790 break;
791 }
792 case NETDEV_UNREGISTER:
793 if (dev->reg_state != NETREG_UNREGISTERING)
794 break;
795
796 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
797 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
798 &lst_kill);
799 unregister_netdevice_many(&lst_kill);
800 break;
801
802 case NETDEV_FEAT_CHANGE:
803 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
804 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
805 ipvlan->dev->gso_max_size = dev->gso_max_size;
806 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
807 netdev_features_change(ipvlan->dev);
808 }
809 break;
810
811 case NETDEV_CHANGEMTU:
812 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
813 ipvlan_adjust_mtu(ipvlan, dev);
814 break;
815
816 case NETDEV_CHANGEADDR:
817 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
818 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
819 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
820 }
821 break;
822
823 case NETDEV_PRE_TYPE_CHANGE:
824 /* Forbid underlying device to change its type. */
825 return NOTIFY_BAD;
826 }
827 return NOTIFY_DONE;
828 }
829
830 /* the caller must held the addrs lock */
831 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
832 {
833 struct ipvl_addr *addr;
834
835 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
836 if (!addr)
837 return -ENOMEM;
838
839 addr->master = ipvlan;
840 if (!is_v6) {
841 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
842 addr->atype = IPVL_IPV4;
843 #if IS_ENABLED(CONFIG_IPV6)
844 } else {
845 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
846 addr->atype = IPVL_IPV6;
847 #endif
848 }
849
850 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
851
852 /* If the interface is not up, the address will be added to the hash
853 * list by ipvlan_open.
854 */
855 if (netif_running(ipvlan->dev))
856 ipvlan_ht_addr_add(ipvlan, addr);
857
858 return 0;
859 }
860
861 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
862 {
863 struct ipvl_addr *addr;
864
865 spin_lock_bh(&ipvlan->addrs_lock);
866 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
867 if (!addr) {
868 spin_unlock_bh(&ipvlan->addrs_lock);
869 return;
870 }
871
872 ipvlan_ht_addr_del(addr);
873 list_del_rcu(&addr->anode);
874 spin_unlock_bh(&ipvlan->addrs_lock);
875 kfree_rcu(addr, rcu);
876 }
877
878 static bool ipvlan_is_valid_dev(const struct net_device *dev)
879 {
880 struct ipvl_dev *ipvlan = netdev_priv(dev);
881
882 if (!netif_is_ipvlan(dev))
883 return false;
884
885 if (!ipvlan || !ipvlan->port)
886 return false;
887
888 return true;
889 }
890
891 #if IS_ENABLED(CONFIG_IPV6)
892 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
893 {
894 int ret = -EINVAL;
895
896 spin_lock_bh(&ipvlan->addrs_lock);
897 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
898 netif_err(ipvlan, ifup, ipvlan->dev,
899 "Failed to add IPv6=%pI6c addr for %s intf\n",
900 ip6_addr, ipvlan->dev->name);
901 else
902 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
903 spin_unlock_bh(&ipvlan->addrs_lock);
904 return ret;
905 }
906
907 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
908 {
909 return ipvlan_del_addr(ipvlan, ip6_addr, true);
910 }
911
912 static int ipvlan_addr6_event(struct notifier_block *unused,
913 unsigned long event, void *ptr)
914 {
915 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
916 struct net_device *dev = (struct net_device *)if6->idev->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_add_addr6(ipvlan, &if6->addr))
925 return NOTIFY_BAD;
926 break;
927
928 case NETDEV_DOWN:
929 ipvlan_del_addr6(ipvlan, &if6->addr);
930 break;
931 }
932
933 return NOTIFY_OK;
934 }
935
936 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
937 unsigned long event, void *ptr)
938 {
939 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
940 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
941 struct ipvl_dev *ipvlan = netdev_priv(dev);
942
943 if (!ipvlan_is_valid_dev(dev))
944 return NOTIFY_DONE;
945
946 switch (event) {
947 case NETDEV_UP:
948 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
949 NL_SET_ERR_MSG(i6vi->extack,
950 "Address already assigned to an ipvlan device");
951 return notifier_from_errno(-EADDRINUSE);
952 }
953 break;
954 }
955
956 return NOTIFY_OK;
957 }
958 #endif
959
960 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
961 {
962 int ret = -EINVAL;
963
964 spin_lock_bh(&ipvlan->addrs_lock);
965 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
966 netif_err(ipvlan, ifup, ipvlan->dev,
967 "Failed to add IPv4=%pI4 on %s intf.\n",
968 ip4_addr, ipvlan->dev->name);
969 else
970 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
971 spin_unlock_bh(&ipvlan->addrs_lock);
972 return ret;
973 }
974
975 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
976 {
977 return ipvlan_del_addr(ipvlan, ip4_addr, false);
978 }
979
980 static int ipvlan_addr4_event(struct notifier_block *unused,
981 unsigned long event, void *ptr)
982 {
983 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
984 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
985 struct ipvl_dev *ipvlan = netdev_priv(dev);
986 struct in_addr ip4_addr;
987
988 if (!ipvlan_is_valid_dev(dev))
989 return NOTIFY_DONE;
990
991 switch (event) {
992 case NETDEV_UP:
993 ip4_addr.s_addr = if4->ifa_address;
994 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
995 return NOTIFY_BAD;
996 break;
997
998 case NETDEV_DOWN:
999 ip4_addr.s_addr = if4->ifa_address;
1000 ipvlan_del_addr4(ipvlan, &ip4_addr);
1001 break;
1002 }
1003
1004 return NOTIFY_OK;
1005 }
1006
1007 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
1008 unsigned long event, void *ptr)
1009 {
1010 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
1011 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
1012 struct ipvl_dev *ipvlan = netdev_priv(dev);
1013
1014 if (!ipvlan_is_valid_dev(dev))
1015 return NOTIFY_DONE;
1016
1017 switch (event) {
1018 case NETDEV_UP:
1019 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
1020 NL_SET_ERR_MSG(ivi->extack,
1021 "Address already assigned to an ipvlan device");
1022 return notifier_from_errno(-EADDRINUSE);
1023 }
1024 break;
1025 }
1026
1027 return NOTIFY_OK;
1028 }
1029
1030 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1031 .notifier_call = ipvlan_addr4_event,
1032 };
1033
1034 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1035 .notifier_call = ipvlan_addr4_validator_event,
1036 };
1037
1038 static struct notifier_block ipvlan_notifier_block __read_mostly = {
1039 .notifier_call = ipvlan_device_event,
1040 };
1041
1042 #if IS_ENABLED(CONFIG_IPV6)
1043 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1044 .notifier_call = ipvlan_addr6_event,
1045 };
1046
1047 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1048 .notifier_call = ipvlan_addr6_validator_event,
1049 };
1050 #endif
1051
1052 static void ipvlan_ns_exit(struct net *net)
1053 {
1054 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
1055
1056 if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
1057 vnet->ipvl_nf_hook_refcnt = 0;
1058 nf_unregister_net_hooks(net, ipvl_nfops,
1059 ARRAY_SIZE(ipvl_nfops));
1060 }
1061 }
1062
1063 static struct pernet_operations ipvlan_net_ops = {
1064 .id = &ipvlan_netid,
1065 .size = sizeof(struct ipvlan_netns),
1066 .exit = ipvlan_ns_exit,
1067 };
1068
1069 static int __init ipvlan_init_module(void)
1070 {
1071 int err;
1072
1073 ipvlan_init_secret();
1074 register_netdevice_notifier(&ipvlan_notifier_block);
1075 #if IS_ENABLED(CONFIG_IPV6)
1076 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1077 register_inet6addr_validator_notifier(
1078 &ipvlan_addr6_vtor_notifier_block);
1079 #endif
1080 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1081 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1082
1083 err = register_pernet_subsys(&ipvlan_net_ops);
1084 if (err < 0)
1085 goto error;
1086
1087 err = ipvlan_link_register(&ipvlan_link_ops);
1088 if (err < 0) {
1089 unregister_pernet_subsys(&ipvlan_net_ops);
1090 goto error;
1091 }
1092
1093 return 0;
1094 error:
1095 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1096 unregister_inetaddr_validator_notifier(
1097 &ipvlan_addr4_vtor_notifier_block);
1098 #if IS_ENABLED(CONFIG_IPV6)
1099 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1100 unregister_inet6addr_validator_notifier(
1101 &ipvlan_addr6_vtor_notifier_block);
1102 #endif
1103 unregister_netdevice_notifier(&ipvlan_notifier_block);
1104 return err;
1105 }
1106
1107 static void __exit ipvlan_cleanup_module(void)
1108 {
1109 rtnl_link_unregister(&ipvlan_link_ops);
1110 unregister_pernet_subsys(&ipvlan_net_ops);
1111 unregister_netdevice_notifier(&ipvlan_notifier_block);
1112 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1113 unregister_inetaddr_validator_notifier(
1114 &ipvlan_addr4_vtor_notifier_block);
1115 #if IS_ENABLED(CONFIG_IPV6)
1116 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1117 unregister_inet6addr_validator_notifier(
1118 &ipvlan_addr6_vtor_notifier_block);
1119 #endif
1120 }
1121
1122 module_init(ipvlan_init_module);
1123 module_exit(ipvlan_cleanup_module);
1124
1125 MODULE_LICENSE("GPL");
1126 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1127 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1128 MODULE_ALIAS_RTNL_LINK("ipvlan");
Linux with added FPC-III support