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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / net / ipvlan / ipvlan_main.c
blob2469df118fbfa925025249780153e23916adb9f7
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 {
26 .hook = ipvlan_nf_input,
27 .pf = NFPROTO_IPV6,
28 .hooknum = NF_INET_LOCAL_IN,
29 .priority = INT_MAX,
30 },
31 };
32
33 static const struct l3mdev_ops ipvl_l3mdev_ops = {
34 .l3mdev_l3_rcv = ipvlan_l3_rcv,
35 };
36
37 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
38 {
39 ipvlan->dev->mtu = dev->mtu;
40 }
41
42 static int ipvlan_register_nf_hook(struct net *net)
43 {
44 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
45 int err = 0;
46
47 if (!vnet->ipvl_nf_hook_refcnt) {
48 err = nf_register_net_hooks(net, ipvl_nfops,
49 ARRAY_SIZE(ipvl_nfops));
50 if (!err)
51 vnet->ipvl_nf_hook_refcnt = 1;
52 } else {
53 vnet->ipvl_nf_hook_refcnt++;
54 }
55
56 return err;
57 }
58
59 static void ipvlan_unregister_nf_hook(struct net *net)
60 {
61 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
62
63 if (WARN_ON(!vnet->ipvl_nf_hook_refcnt))
64 return;
65
66 vnet->ipvl_nf_hook_refcnt--;
67 if (!vnet->ipvl_nf_hook_refcnt)
68 nf_unregister_net_hooks(net, ipvl_nfops,
69 ARRAY_SIZE(ipvl_nfops));
70 }
71
72 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval)
73 {
74 struct ipvl_dev *ipvlan;
75 struct net_device *mdev = port->dev;
76 int err = 0;
77
78 ASSERT_RTNL();
79 if (port->mode != nval) {
80 if (nval == IPVLAN_MODE_L3S) {
81 /* New mode is L3S */
82 err = ipvlan_register_nf_hook(read_pnet(&port->pnet));
83 if (!err) {
84 mdev->l3mdev_ops = &ipvl_l3mdev_ops;
85 mdev->priv_flags |= IFF_L3MDEV_MASTER;
86 } else
87 return err;
88 } else if (port->mode == IPVLAN_MODE_L3S) {
89 /* Old mode was L3S */
90 mdev->priv_flags &= ~IFF_L3MDEV_MASTER;
91 ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
92 mdev->l3mdev_ops = NULL;
93 }
94 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
95 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S)
96 ipvlan->dev->flags |= IFF_NOARP;
97 else
98 ipvlan->dev->flags &= ~IFF_NOARP;
99 }
100 port->mode = nval;
101 }
102 return err;
103 }
104
105 static int ipvlan_port_create(struct net_device *dev)
106 {
107 struct ipvl_port *port;
108 int err, idx;
109
110 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
111 if (!port)
112 return -ENOMEM;
113
114 write_pnet(&port->pnet, dev_net(dev));
115 port->dev = dev;
116 port->mode = IPVLAN_MODE_L3;
117 INIT_LIST_HEAD(&port->ipvlans);
118 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
119 INIT_HLIST_HEAD(&port->hlhead[idx]);
120
121 skb_queue_head_init(&port->backlog);
122 INIT_WORK(&port->wq, ipvlan_process_multicast);
123 ida_init(&port->ida);
124 port->dev_id_start = 1;
125
126 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
127 if (err)
128 goto err;
129
130 dev->priv_flags |= IFF_IPVLAN_MASTER;
131 return 0;
132
133 err:
134 kfree(port);
135 return err;
136 }
137
138 static void ipvlan_port_destroy(struct net_device *dev)
139 {
140 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
141 struct sk_buff *skb;
142
143 dev->priv_flags &= ~IFF_IPVLAN_MASTER;
144 if (port->mode == IPVLAN_MODE_L3S) {
145 dev->priv_flags &= ~IFF_L3MDEV_MASTER;
146 ipvlan_unregister_nf_hook(dev_net(dev));
147 dev->l3mdev_ops = NULL;
148 }
149 netdev_rx_handler_unregister(dev);
150 cancel_work_sync(&port->wq);
151 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
152 if (skb->dev)
153 dev_put(skb->dev);
154 kfree_skb(skb);
155 }
156 ida_destroy(&port->ida);
157 kfree(port);
158 }
159
160 #define IPVLAN_FEATURES \
161 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
162 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
163 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
164 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
165
166 #define IPVLAN_STATE_MASK \
167 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
168
169 static int ipvlan_init(struct net_device *dev)
170 {
171 struct ipvl_dev *ipvlan = netdev_priv(dev);
172 struct net_device *phy_dev = ipvlan->phy_dev;
173 struct ipvl_port *port;
174 int err;
175
176 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
177 (phy_dev->state & IPVLAN_STATE_MASK);
178 dev->features = phy_dev->features & IPVLAN_FEATURES;
179 dev->features |= NETIF_F_LLTX;
180 dev->gso_max_size = phy_dev->gso_max_size;
181 dev->gso_max_segs = phy_dev->gso_max_segs;
182 dev->hard_header_len = phy_dev->hard_header_len;
183
184 netdev_lockdep_set_classes(dev);
185
186 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
187 if (!ipvlan->pcpu_stats)
188 return -ENOMEM;
189
190 if (!netif_is_ipvlan_port(phy_dev)) {
191 err = ipvlan_port_create(phy_dev);
192 if (err < 0) {
193 free_percpu(ipvlan->pcpu_stats);
194 return err;
195 }
196 }
197 port = ipvlan_port_get_rtnl(phy_dev);
198 port->count += 1;
199 return 0;
200 }
201
202 static void ipvlan_uninit(struct net_device *dev)
203 {
204 struct ipvl_dev *ipvlan = netdev_priv(dev);
205 struct net_device *phy_dev = ipvlan->phy_dev;
206 struct ipvl_port *port;
207
208 free_percpu(ipvlan->pcpu_stats);
209
210 port = ipvlan_port_get_rtnl(phy_dev);
211 port->count -= 1;
212 if (!port->count)
213 ipvlan_port_destroy(port->dev);
214 }
215
216 static int ipvlan_open(struct net_device *dev)
217 {
218 struct ipvl_dev *ipvlan = netdev_priv(dev);
219 struct net_device *phy_dev = ipvlan->phy_dev;
220 struct ipvl_addr *addr;
221
222 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
223 ipvlan->port->mode == IPVLAN_MODE_L3S)
224 dev->flags |= IFF_NOARP;
225 else
226 dev->flags &= ~IFF_NOARP;
227
228 list_for_each_entry(addr, &ipvlan->addrs, anode)
229 ipvlan_ht_addr_add(ipvlan, addr);
230
231 return dev_uc_add(phy_dev, phy_dev->dev_addr);
232 }
233
234 static int ipvlan_stop(struct net_device *dev)
235 {
236 struct ipvl_dev *ipvlan = netdev_priv(dev);
237 struct net_device *phy_dev = ipvlan->phy_dev;
238 struct ipvl_addr *addr;
239
240 dev_uc_unsync(phy_dev, dev);
241 dev_mc_unsync(phy_dev, dev);
242
243 dev_uc_del(phy_dev, phy_dev->dev_addr);
244
245 list_for_each_entry(addr, &ipvlan->addrs, anode)
246 ipvlan_ht_addr_del(addr);
247
248 return 0;
249 }
250
251 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
252 struct net_device *dev)
253 {
254 const struct ipvl_dev *ipvlan = netdev_priv(dev);
255 int skblen = skb->len;
256 int ret;
257
258 ret = ipvlan_queue_xmit(skb, dev);
259 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
260 struct ipvl_pcpu_stats *pcptr;
261
262 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
263
264 u64_stats_update_begin(&pcptr->syncp);
265 pcptr->tx_pkts++;
266 pcptr->tx_bytes += skblen;
267 u64_stats_update_end(&pcptr->syncp);
268 } else {
269 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
270 }
271 return ret;
272 }
273
274 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
275 netdev_features_t features)
276 {
277 struct ipvl_dev *ipvlan = netdev_priv(dev);
278
279 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
280 }
281
282 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
283 {
284 struct ipvl_dev *ipvlan = netdev_priv(dev);
285 struct net_device *phy_dev = ipvlan->phy_dev;
286
287 if (change & IFF_ALLMULTI)
288 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
289 }
290
291 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
292 {
293 struct ipvl_dev *ipvlan = netdev_priv(dev);
294
295 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
296 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
297 } else {
298 struct netdev_hw_addr *ha;
299 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
300
301 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
302 netdev_for_each_mc_addr(ha, dev)
303 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
304
305 /* Turn-on broadcast bit irrespective of address family,
306 * since broadcast is deferred to a work-queue, hence no
307 * impact on fast-path processing.
308 */
309 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
310
311 bitmap_copy(ipvlan->mac_filters, mc_filters,
312 IPVLAN_MAC_FILTER_SIZE);
313 }
314 dev_uc_sync(ipvlan->phy_dev, dev);
315 dev_mc_sync(ipvlan->phy_dev, dev);
316 }
317
318 static void ipvlan_get_stats64(struct net_device *dev,
319 struct rtnl_link_stats64 *s)
320 {
321 struct ipvl_dev *ipvlan = netdev_priv(dev);
322
323 if (ipvlan->pcpu_stats) {
324 struct ipvl_pcpu_stats *pcptr;
325 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
326 u32 rx_errs = 0, tx_drps = 0;
327 u32 strt;
328 int idx;
329
330 for_each_possible_cpu(idx) {
331 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
332 do {
333 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
334 rx_pkts = pcptr->rx_pkts;
335 rx_bytes = pcptr->rx_bytes;
336 rx_mcast = pcptr->rx_mcast;
337 tx_pkts = pcptr->tx_pkts;
338 tx_bytes = pcptr->tx_bytes;
339 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
340 strt));
341
342 s->rx_packets += rx_pkts;
343 s->rx_bytes += rx_bytes;
344 s->multicast += rx_mcast;
345 s->tx_packets += tx_pkts;
346 s->tx_bytes += tx_bytes;
347
348 /* u32 values are updated without syncp protection. */
349 rx_errs += pcptr->rx_errs;
350 tx_drps += pcptr->tx_drps;
351 }
352 s->rx_errors = rx_errs;
353 s->rx_dropped = rx_errs;
354 s->tx_dropped = tx_drps;
355 }
356 }
357
358 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
359 {
360 struct ipvl_dev *ipvlan = netdev_priv(dev);
361 struct net_device *phy_dev = ipvlan->phy_dev;
362
363 return vlan_vid_add(phy_dev, proto, vid);
364 }
365
366 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
367 u16 vid)
368 {
369 struct ipvl_dev *ipvlan = netdev_priv(dev);
370 struct net_device *phy_dev = ipvlan->phy_dev;
371
372 vlan_vid_del(phy_dev, proto, vid);
373 return 0;
374 }
375
376 static int ipvlan_get_iflink(const struct net_device *dev)
377 {
378 struct ipvl_dev *ipvlan = netdev_priv(dev);
379
380 return ipvlan->phy_dev->ifindex;
381 }
382
383 static const struct net_device_ops ipvlan_netdev_ops = {
384 .ndo_init = ipvlan_init,
385 .ndo_uninit = ipvlan_uninit,
386 .ndo_open = ipvlan_open,
387 .ndo_stop = ipvlan_stop,
388 .ndo_start_xmit = ipvlan_start_xmit,
389 .ndo_fix_features = ipvlan_fix_features,
390 .ndo_change_rx_flags = ipvlan_change_rx_flags,
391 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
392 .ndo_get_stats64 = ipvlan_get_stats64,
393 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
394 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
395 .ndo_get_iflink = ipvlan_get_iflink,
396 };
397
398 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
399 unsigned short type, const void *daddr,
400 const void *saddr, unsigned len)
401 {
402 const struct ipvl_dev *ipvlan = netdev_priv(dev);
403 struct net_device *phy_dev = ipvlan->phy_dev;
404
405 /* TODO Probably use a different field than dev_addr so that the
406 * mac-address on the virtual device is portable and can be carried
407 * while the packets use the mac-addr on the physical device.
408 */
409 return dev_hard_header(skb, phy_dev, type, daddr,
410 saddr ? : phy_dev->dev_addr, len);
411 }
412
413 static const struct header_ops ipvlan_header_ops = {
414 .create = ipvlan_hard_header,
415 .parse = eth_header_parse,
416 .cache = eth_header_cache,
417 .cache_update = eth_header_cache_update,
418 };
419
420 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
421 struct ethtool_link_ksettings *cmd)
422 {
423 const struct ipvl_dev *ipvlan = netdev_priv(dev);
424
425 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
426 }
427
428 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
429 struct ethtool_drvinfo *drvinfo)
430 {
431 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
432 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
433 }
434
435 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
436 {
437 const struct ipvl_dev *ipvlan = netdev_priv(dev);
438
439 return ipvlan->msg_enable;
440 }
441
442 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
443 {
444 struct ipvl_dev *ipvlan = netdev_priv(dev);
445
446 ipvlan->msg_enable = value;
447 }
448
449 static const struct ethtool_ops ipvlan_ethtool_ops = {
450 .get_link = ethtool_op_get_link,
451 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
452 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
453 .get_msglevel = ipvlan_ethtool_get_msglevel,
454 .set_msglevel = ipvlan_ethtool_set_msglevel,
455 };
456
457 static int ipvlan_nl_changelink(struct net_device *dev,
458 struct nlattr *tb[], struct nlattr *data[],
459 struct netlink_ext_ack *extack)
460 {
461 struct ipvl_dev *ipvlan = netdev_priv(dev);
462 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
463 int err = 0;
464
465 if (!data)
466 return 0;
467
468 if (data[IFLA_IPVLAN_MODE]) {
469 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
470
471 err = ipvlan_set_port_mode(port, nmode);
472 }
473
474 if (!err && data[IFLA_IPVLAN_FLAGS]) {
475 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
476
477 if (flags & IPVLAN_F_PRIVATE)
478 ipvlan_mark_private(port);
479 else
480 ipvlan_clear_private(port);
481
482 if (flags & IPVLAN_F_VEPA)
483 ipvlan_mark_vepa(port);
484 else
485 ipvlan_clear_vepa(port);
486 }
487
488 return err;
489 }
490
491 static size_t ipvlan_nl_getsize(const struct net_device *dev)
492 {
493 return (0
494 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
495 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
496 );
497 }
498
499 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
500 struct netlink_ext_ack *extack)
501 {
502 if (!data)
503 return 0;
504
505 if (data[IFLA_IPVLAN_MODE]) {
506 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
507
508 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX)
509 return -EINVAL;
510 }
511 if (data[IFLA_IPVLAN_FLAGS]) {
512 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
513
514 /* Only two bits are used at this moment. */
515 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
516 return -EINVAL;
517 /* Also both flags can't be active at the same time. */
518 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
519 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
520 return -EINVAL;
521 }
522
523 return 0;
524 }
525
526 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
527 const struct net_device *dev)
528 {
529 struct ipvl_dev *ipvlan = netdev_priv(dev);
530 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
531 int ret = -EINVAL;
532
533 if (!port)
534 goto err;
535
536 ret = -EMSGSIZE;
537 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
538 goto err;
539 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
540 goto err;
541
542 return 0;
543
544 err:
545 return ret;
546 }
547
548 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
549 struct nlattr *tb[], struct nlattr *data[],
550 struct netlink_ext_ack *extack)
551 {
552 struct ipvl_dev *ipvlan = netdev_priv(dev);
553 struct ipvl_port *port;
554 struct net_device *phy_dev;
555 int err;
556 u16 mode = IPVLAN_MODE_L3;
557
558 if (!tb[IFLA_LINK])
559 return -EINVAL;
560
561 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
562 if (!phy_dev)
563 return -ENODEV;
564
565 if (netif_is_ipvlan(phy_dev)) {
566 struct ipvl_dev *tmp = netdev_priv(phy_dev);
567
568 phy_dev = tmp->phy_dev;
569 } else if (!netif_is_ipvlan_port(phy_dev)) {
570 /* Exit early if the underlying link is invalid or busy */
571 if (phy_dev->type != ARPHRD_ETHER ||
572 phy_dev->flags & IFF_LOOPBACK) {
573 netdev_err(phy_dev,
574 "Master is either lo or non-ether device\n");
575 return -EINVAL;
576 }
577
578 if (netdev_is_rx_handler_busy(phy_dev)) {
579 netdev_err(phy_dev, "Device is already in use.\n");
580 return -EBUSY;
581 }
582 }
583
584 ipvlan->phy_dev = phy_dev;
585 ipvlan->dev = dev;
586 ipvlan->sfeatures = IPVLAN_FEATURES;
587 ipvlan_adjust_mtu(ipvlan, phy_dev);
588 INIT_LIST_HEAD(&ipvlan->addrs);
589
590 /* TODO Probably put random address here to be presented to the
591 * world but keep using the physical-dev address for the outgoing
592 * packets.
593 */
594 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
595
596 dev->priv_flags |= IFF_IPVLAN_SLAVE;
597
598 err = register_netdevice(dev);
599 if (err < 0)
600 return err;
601
602 /* ipvlan_init() would have created the port, if required */
603 port = ipvlan_port_get_rtnl(phy_dev);
604 ipvlan->port = port;
605
606 /* If the port-id base is at the MAX value, then wrap it around and
607 * begin from 0x1 again. This may be due to a busy system where lots
608 * of slaves are getting created and deleted.
609 */
610 if (port->dev_id_start == 0xFFFE)
611 port->dev_id_start = 0x1;
612
613 /* Since L2 address is shared among all IPvlan slaves including
614 * master, use unique 16 bit dev-ids to diffentiate among them.
615 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
616 * slave link [see addrconf_ifid_eui48()].
617 */
618 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
619 GFP_KERNEL);
620 if (err < 0)
621 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
622 GFP_KERNEL);
623 if (err < 0)
624 goto unregister_netdev;
625 dev->dev_id = err;
626
627 /* Increment id-base to the next slot for the future assignment */
628 port->dev_id_start = err + 1;
629
630 err = netdev_upper_dev_link(phy_dev, dev, extack);
631 if (err)
632 goto remove_ida;
633
634 /* Flags are per port and latest update overrides. User has
635 * to be consistent in setting it just like the mode attribute.
636 */
637 if (data && data[IFLA_IPVLAN_FLAGS])
638 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
639
640 if (data && data[IFLA_IPVLAN_MODE])
641 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
642
643 err = ipvlan_set_port_mode(port, mode);
644 if (err)
645 goto unlink_netdev;
646
647 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
648 netif_stacked_transfer_operstate(phy_dev, dev);
649 return 0;
650
651 unlink_netdev:
652 netdev_upper_dev_unlink(phy_dev, dev);
653 remove_ida:
654 ida_simple_remove(&port->ida, dev->dev_id);
655 unregister_netdev:
656 unregister_netdevice(dev);
657 return err;
658 }
659 EXPORT_SYMBOL_GPL(ipvlan_link_new);
660
661 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
662 {
663 struct ipvl_dev *ipvlan = netdev_priv(dev);
664 struct ipvl_addr *addr, *next;
665
666 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
667 ipvlan_ht_addr_del(addr);
668 list_del(&addr->anode);
669 kfree_rcu(addr, rcu);
670 }
671
672 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
673 list_del_rcu(&ipvlan->pnode);
674 unregister_netdevice_queue(dev, head);
675 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
676 }
677 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
678
679 void ipvlan_link_setup(struct net_device *dev)
680 {
681 ether_setup(dev);
682
683 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
684 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
685 dev->netdev_ops = &ipvlan_netdev_ops;
686 dev->needs_free_netdev = true;
687 dev->header_ops = &ipvlan_header_ops;
688 dev->ethtool_ops = &ipvlan_ethtool_ops;
689 }
690 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
691
692 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
693 {
694 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
695 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
696 };
697
698 static struct rtnl_link_ops ipvlan_link_ops = {
699 .kind = "ipvlan",
700 .priv_size = sizeof(struct ipvl_dev),
701
702 .setup = ipvlan_link_setup,
703 .newlink = ipvlan_link_new,
704 .dellink = ipvlan_link_delete,
705 };
706
707 int ipvlan_link_register(struct rtnl_link_ops *ops)
708 {
709 ops->get_size = ipvlan_nl_getsize;
710 ops->policy = ipvlan_nl_policy;
711 ops->validate = ipvlan_nl_validate;
712 ops->fill_info = ipvlan_nl_fillinfo;
713 ops->changelink = ipvlan_nl_changelink;
714 ops->maxtype = IFLA_IPVLAN_MAX;
715 return rtnl_link_register(ops);
716 }
717 EXPORT_SYMBOL_GPL(ipvlan_link_register);
718
719 static int ipvlan_device_event(struct notifier_block *unused,
720 unsigned long event, void *ptr)
721 {
722 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
723 struct ipvl_dev *ipvlan, *next;
724 struct ipvl_port *port;
725 LIST_HEAD(lst_kill);
726
727 if (!netif_is_ipvlan_port(dev))
728 return NOTIFY_DONE;
729
730 port = ipvlan_port_get_rtnl(dev);
731
732 switch (event) {
733 case NETDEV_CHANGE:
734 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
735 netif_stacked_transfer_operstate(ipvlan->phy_dev,
736 ipvlan->dev);
737 break;
738
739 case NETDEV_REGISTER: {
740 struct net *oldnet, *newnet = dev_net(dev);
741 struct ipvlan_netns *old_vnet;
742
743 oldnet = read_pnet(&port->pnet);
744 if (net_eq(newnet, oldnet))
745 break;
746
747 write_pnet(&port->pnet, newnet);
748
749 old_vnet = net_generic(oldnet, ipvlan_netid);
750 if (!old_vnet->ipvl_nf_hook_refcnt)
751 break;
752
753 ipvlan_register_nf_hook(newnet);
754 ipvlan_unregister_nf_hook(oldnet);
755 break;
756 }
757 case NETDEV_UNREGISTER:
758 if (dev->reg_state != NETREG_UNREGISTERING)
759 break;
760
761 list_for_each_entry_safe(ipvlan, next, &port->ipvlans,
762 pnode)
763 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
764 &lst_kill);
765 unregister_netdevice_many(&lst_kill);
766 break;
767
768 case NETDEV_FEAT_CHANGE:
769 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
770 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
771 ipvlan->dev->gso_max_size = dev->gso_max_size;
772 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
773 netdev_features_change(ipvlan->dev);
774 }
775 break;
776
777 case NETDEV_CHANGEMTU:
778 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
779 ipvlan_adjust_mtu(ipvlan, dev);
780 break;
781
782 case NETDEV_CHANGEADDR:
783 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
784 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
785 break;
786
787 case NETDEV_PRE_TYPE_CHANGE:
788 /* Forbid underlying device to change its type. */
789 return NOTIFY_BAD;
790 }
791 return NOTIFY_DONE;
792 }
793
794 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
795 {
796 struct ipvl_addr *addr;
797
798 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
799 if (!addr)
800 return -ENOMEM;
801
802 addr->master = ipvlan;
803 if (is_v6) {
804 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
805 addr->atype = IPVL_IPV6;
806 } else {
807 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
808 addr->atype = IPVL_IPV4;
809 }
810 list_add_tail(&addr->anode, &ipvlan->addrs);
811
812 /* If the interface is not up, the address will be added to the hash
813 * list by ipvlan_open.
814 */
815 if (netif_running(ipvlan->dev))
816 ipvlan_ht_addr_add(ipvlan, addr);
817
818 return 0;
819 }
820
821 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
822 {
823 struct ipvl_addr *addr;
824
825 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
826 if (!addr)
827 return;
828
829 ipvlan_ht_addr_del(addr);
830 list_del(&addr->anode);
831 kfree_rcu(addr, rcu);
832
833 return;
834 }
835
836 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
837 {
838 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) {
839 netif_err(ipvlan, ifup, ipvlan->dev,
840 "Failed to add IPv6=%pI6c addr for %s intf\n",
841 ip6_addr, ipvlan->dev->name);
842 return -EINVAL;
843 }
844
845 return ipvlan_add_addr(ipvlan, ip6_addr, true);
846 }
847
848 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
849 {
850 return ipvlan_del_addr(ipvlan, ip6_addr, true);
851 }
852
853 static bool ipvlan_is_valid_dev(const struct net_device *dev)
854 {
855 struct ipvl_dev *ipvlan = netdev_priv(dev);
856
857 if (!netif_is_ipvlan(dev))
858 return false;
859
860 if (!ipvlan || !ipvlan->port)
861 return false;
862
863 return true;
864 }
865
866 static int ipvlan_addr6_event(struct notifier_block *unused,
867 unsigned long event, void *ptr)
868 {
869 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
870 struct net_device *dev = (struct net_device *)if6->idev->dev;
871 struct ipvl_dev *ipvlan = netdev_priv(dev);
872
873 if (!ipvlan_is_valid_dev(dev))
874 return NOTIFY_DONE;
875
876 switch (event) {
877 case NETDEV_UP:
878 if (ipvlan_add_addr6(ipvlan, &if6->addr))
879 return NOTIFY_BAD;
880 break;
881
882 case NETDEV_DOWN:
883 ipvlan_del_addr6(ipvlan, &if6->addr);
884 break;
885 }
886
887 return NOTIFY_OK;
888 }
889
890 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
891 unsigned long event, void *ptr)
892 {
893 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
894 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
895 struct ipvl_dev *ipvlan = netdev_priv(dev);
896
897 /* FIXME IPv6 autoconf calls us from bh without RTNL */
898 if (in_softirq())
899 return NOTIFY_DONE;
900
901 if (!ipvlan_is_valid_dev(dev))
902 return NOTIFY_DONE;
903
904 switch (event) {
905 case NETDEV_UP:
906 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
907 NL_SET_ERR_MSG(i6vi->extack,
908 "Address already assigned to an ipvlan device");
909 return notifier_from_errno(-EADDRINUSE);
910 }
911 break;
912 }
913
914 return NOTIFY_OK;
915 }
916
917 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
918 {
919 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) {
920 netif_err(ipvlan, ifup, ipvlan->dev,
921 "Failed to add IPv4=%pI4 on %s intf.\n",
922 ip4_addr, ipvlan->dev->name);
923 return -EINVAL;
924 }
925
926 return ipvlan_add_addr(ipvlan, ip4_addr, false);
927 }
928
929 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
930 {
931 return ipvlan_del_addr(ipvlan, ip4_addr, false);
932 }
933
934 static int ipvlan_addr4_event(struct notifier_block *unused,
935 unsigned long event, void *ptr)
936 {
937 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
938 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
939 struct ipvl_dev *ipvlan = netdev_priv(dev);
940 struct in_addr ip4_addr;
941
942 if (!ipvlan_is_valid_dev(dev))
943 return NOTIFY_DONE;
944
945 switch (event) {
946 case NETDEV_UP:
947 ip4_addr.s_addr = if4->ifa_address;
948 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
949 return NOTIFY_BAD;
950 break;
951
952 case NETDEV_DOWN:
953 ip4_addr.s_addr = if4->ifa_address;
954 ipvlan_del_addr4(ipvlan, &ip4_addr);
955 break;
956 }
957
958 return NOTIFY_OK;
959 }
960
961 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
962 unsigned long event, void *ptr)
963 {
964 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
965 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
966 struct ipvl_dev *ipvlan = netdev_priv(dev);
967
968 if (!ipvlan_is_valid_dev(dev))
969 return NOTIFY_DONE;
970
971 switch (event) {
972 case NETDEV_UP:
973 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
974 NL_SET_ERR_MSG(ivi->extack,
975 "Address already assigned to an ipvlan device");
976 return notifier_from_errno(-EADDRINUSE);
977 }
978 break;
979 }
980
981 return NOTIFY_OK;
982 }
983
984 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
985 .notifier_call = ipvlan_addr4_event,
986 };
987
988 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
989 .notifier_call = ipvlan_addr4_validator_event,
990 };
991
992 static struct notifier_block ipvlan_notifier_block __read_mostly = {
993 .notifier_call = ipvlan_device_event,
994 };
995
996 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
997 .notifier_call = ipvlan_addr6_event,
998 };
999
1000 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1001 .notifier_call = ipvlan_addr6_validator_event,
1002 };
1003
1004 static void ipvlan_ns_exit(struct net *net)
1005 {
1006 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
1007
1008 if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
1009 vnet->ipvl_nf_hook_refcnt = 0;
1010 nf_unregister_net_hooks(net, ipvl_nfops,
1011 ARRAY_SIZE(ipvl_nfops));
1012 }
1013 }
1014
1015 static struct pernet_operations ipvlan_net_ops = {
1016 .id = &ipvlan_netid,
1017 .size = sizeof(struct ipvlan_netns),
1018 .exit = ipvlan_ns_exit,
1019 };
1020
1021 static int __init ipvlan_init_module(void)
1022 {
1023 int err;
1024
1025 ipvlan_init_secret();
1026 register_netdevice_notifier(&ipvlan_notifier_block);
1027 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1028 register_inet6addr_validator_notifier(
1029 &ipvlan_addr6_vtor_notifier_block);
1030 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1031 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1032
1033 err = register_pernet_subsys(&ipvlan_net_ops);
1034 if (err < 0)
1035 goto error;
1036
1037 err = ipvlan_link_register(&ipvlan_link_ops);
1038 if (err < 0) {
1039 unregister_pernet_subsys(&ipvlan_net_ops);
1040 goto error;
1041 }
1042
1043 return 0;
1044 error:
1045 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1046 unregister_inetaddr_validator_notifier(
1047 &ipvlan_addr4_vtor_notifier_block);
1048 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1049 unregister_inet6addr_validator_notifier(
1050 &ipvlan_addr6_vtor_notifier_block);
1051 unregister_netdevice_notifier(&ipvlan_notifier_block);
1052 return err;
1053 }
1054
1055 static void __exit ipvlan_cleanup_module(void)
1056 {
1057 rtnl_link_unregister(&ipvlan_link_ops);
1058 unregister_pernet_subsys(&ipvlan_net_ops);
1059 unregister_netdevice_notifier(&ipvlan_notifier_block);
1060 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1061 unregister_inetaddr_validator_notifier(
1062 &ipvlan_addr4_vtor_notifier_block);
1063 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1064 unregister_inet6addr_validator_notifier(
1065 &ipvlan_addr6_vtor_notifier_block);
1066 }
1067
1068 module_init(ipvlan_init_module);
1069 module_exit(ipvlan_cleanup_module);
1070
1071 MODULE_LICENSE("GPL");
1072 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1073 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1074 MODULE_ALIAS_RTNL_LINK("ipvlan");
CRIS linux kernel tree