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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
3 */
4
5#include <linux/ethtool.h>
6
7#include "ipvlan.h"
8
9static 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
45fail:
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
61static int ipvlan_port_create(struct net_device *dev)
62{
63 struct ipvl_port *port;
64 int err, idx;
65
66 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
67 if (!port)
68 return -ENOMEM;
69
70 write_pnet(&port->pnet, dev_net(dev));
71 port->dev = dev;
72 port->mode = IPVLAN_MODE_L3;
73 INIT_LIST_HEAD(&port->ipvlans);
74 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
75 INIT_HLIST_HEAD(&port->hlhead[idx]);
76
77 skb_queue_head_init(&port->backlog);
78 INIT_WORK(&port->wq, ipvlan_process_multicast);
79 ida_init(&port->ida);
80 port->dev_id_start = 1;
81
82 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
83 if (err)
84 goto err;
85
86 netdev_hold(dev, &port->dev_tracker, GFP_KERNEL);
87 return 0;
88
89err:
90 kfree(port);
91 return err;
92}
93
94static void ipvlan_port_destroy(struct net_device *dev)
95{
96 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
97 struct sk_buff *skb;
98
99 netdev_put(dev, &port->dev_tracker);
100 if (port->mode == IPVLAN_MODE_L3S)
101 ipvlan_l3s_unregister(port);
102 netdev_rx_handler_unregister(dev);
103 cancel_work_sync(&port->wq);
104 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
105 dev_put(skb->dev);
106 kfree_skb(skb);
107 }
108 ida_destroy(&port->ida);
109 kfree(port);
110}
111
112#define IPVLAN_ALWAYS_ON_OFLOADS \
113 (NETIF_F_SG | NETIF_F_HW_CSUM | \
114 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
115
116#define IPVLAN_ALWAYS_ON \
117 (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED)
118
119#define IPVLAN_FEATURES \
120 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
121 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
122 NETIF_F_GRO | NETIF_F_RXCSUM | \
123 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
124
125 /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
126
127#define IPVLAN_STATE_MASK \
128 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
129
130static int ipvlan_init(struct net_device *dev)
131{
132 struct ipvl_dev *ipvlan = netdev_priv(dev);
133 struct net_device *phy_dev = ipvlan->phy_dev;
134 struct ipvl_port *port;
135 int err;
136
137 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
138 (phy_dev->state & IPVLAN_STATE_MASK);
139 dev->features = phy_dev->features & IPVLAN_FEATURES;
140 dev->features |= IPVLAN_ALWAYS_ON;
141 dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
142 dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
143 dev->hw_enc_features |= dev->features;
144 netif_inherit_tso_max(dev, phy_dev);
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
165static 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
179static 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
198static 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
215static 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 u64_stats_inc(&pcptr->tx_pkts);
230 u64_stats_add(&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
238static 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
253static 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
262static 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
289static 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(&pcptr->syncp);
305 rx_pkts = u64_stats_read(&pcptr->rx_pkts);
306 rx_bytes = u64_stats_read(&pcptr->rx_bytes);
307 rx_mcast = u64_stats_read(&pcptr->rx_mcast);
308 tx_pkts = u64_stats_read(&pcptr->tx_pkts);
309 tx_bytes = u64_stats_read(&pcptr->tx_bytes);
310 } while (u64_stats_fetch_retry(&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 += READ_ONCE(pcptr->rx_errs);
321 tx_drps += READ_ONCE(pcptr->tx_drps);
322 }
323 s->rx_errors = rx_errs;
324 s->rx_dropped = rx_errs;
325 s->tx_dropped = tx_drps;
326 }
327 s->tx_errors = DEV_STATS_READ(dev, tx_errors);
328}
329
330static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
331{
332 struct ipvl_dev *ipvlan = netdev_priv(dev);
333 struct net_device *phy_dev = ipvlan->phy_dev;
334
335 return vlan_vid_add(phy_dev, proto, vid);
336}
337
338static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
339 u16 vid)
340{
341 struct ipvl_dev *ipvlan = netdev_priv(dev);
342 struct net_device *phy_dev = ipvlan->phy_dev;
343
344 vlan_vid_del(phy_dev, proto, vid);
345 return 0;
346}
347
348static int ipvlan_get_iflink(const struct net_device *dev)
349{
350 struct ipvl_dev *ipvlan = netdev_priv(dev);
351
352 return ipvlan->phy_dev->ifindex;
353}
354
355static const struct net_device_ops ipvlan_netdev_ops = {
356 .ndo_init = ipvlan_init,
357 .ndo_uninit = ipvlan_uninit,
358 .ndo_open = ipvlan_open,
359 .ndo_stop = ipvlan_stop,
360 .ndo_start_xmit = ipvlan_start_xmit,
361 .ndo_fix_features = ipvlan_fix_features,
362 .ndo_change_rx_flags = ipvlan_change_rx_flags,
363 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
364 .ndo_get_stats64 = ipvlan_get_stats64,
365 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
366 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
367 .ndo_get_iflink = ipvlan_get_iflink,
368};
369
370static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
371 unsigned short type, const void *daddr,
372 const void *saddr, unsigned len)
373{
374 const struct ipvl_dev *ipvlan = netdev_priv(dev);
375 struct net_device *phy_dev = ipvlan->phy_dev;
376
377 /* TODO Probably use a different field than dev_addr so that the
378 * mac-address on the virtual device is portable and can be carried
379 * while the packets use the mac-addr on the physical device.
380 */
381 return dev_hard_header(skb, phy_dev, type, daddr,
382 saddr ? : phy_dev->dev_addr, len);
383}
384
385static const struct header_ops ipvlan_header_ops = {
386 .create = ipvlan_hard_header,
387 .parse = eth_header_parse,
388 .cache = eth_header_cache,
389 .cache_update = eth_header_cache_update,
390 .parse_protocol = eth_header_parse_protocol,
391};
392
393static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
394{
395 ipvlan->dev->mtu = dev->mtu;
396}
397
398static bool netif_is_ipvlan(const struct net_device *dev)
399{
400 /* both ipvlan and ipvtap devices use the same netdev_ops */
401 return dev->netdev_ops == &ipvlan_netdev_ops;
402}
403
404static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
405 struct ethtool_link_ksettings *cmd)
406{
407 const struct ipvl_dev *ipvlan = netdev_priv(dev);
408
409 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
410}
411
412static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
413 struct ethtool_drvinfo *drvinfo)
414{
415 strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
416 strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
417}
418
419static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
420{
421 const struct ipvl_dev *ipvlan = netdev_priv(dev);
422
423 return ipvlan->msg_enable;
424}
425
426static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
427{
428 struct ipvl_dev *ipvlan = netdev_priv(dev);
429
430 ipvlan->msg_enable = value;
431}
432
433static const struct ethtool_ops ipvlan_ethtool_ops = {
434 .get_link = ethtool_op_get_link,
435 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
436 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
437 .get_msglevel = ipvlan_ethtool_get_msglevel,
438 .set_msglevel = ipvlan_ethtool_set_msglevel,
439};
440
441static int ipvlan_nl_changelink(struct net_device *dev,
442 struct nlattr *tb[], struct nlattr *data[],
443 struct netlink_ext_ack *extack)
444{
445 struct ipvl_dev *ipvlan = netdev_priv(dev);
446 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
447 int err = 0;
448
449 if (!data)
450 return 0;
451 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
452 return -EPERM;
453
454 if (data[IFLA_IPVLAN_MODE]) {
455 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
456
457 err = ipvlan_set_port_mode(port, nmode, extack);
458 }
459
460 if (!err && data[IFLA_IPVLAN_FLAGS]) {
461 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
462
463 if (flags & IPVLAN_F_PRIVATE)
464 ipvlan_mark_private(port);
465 else
466 ipvlan_clear_private(port);
467
468 if (flags & IPVLAN_F_VEPA)
469 ipvlan_mark_vepa(port);
470 else
471 ipvlan_clear_vepa(port);
472 }
473
474 return err;
475}
476
477static size_t ipvlan_nl_getsize(const struct net_device *dev)
478{
479 return (0
480 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
481 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
482 );
483}
484
485static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
486 struct netlink_ext_ack *extack)
487{
488 if (!data)
489 return 0;
490
491 if (data[IFLA_IPVLAN_MODE]) {
492 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
493
494 if (mode >= IPVLAN_MODE_MAX)
495 return -EINVAL;
496 }
497 if (data[IFLA_IPVLAN_FLAGS]) {
498 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
499
500 /* Only two bits are used at this moment. */
501 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
502 return -EINVAL;
503 /* Also both flags can't be active at the same time. */
504 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
505 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
506 return -EINVAL;
507 }
508
509 return 0;
510}
511
512static int ipvlan_nl_fillinfo(struct sk_buff *skb,
513 const struct net_device *dev)
514{
515 struct ipvl_dev *ipvlan = netdev_priv(dev);
516 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
517 int ret = -EINVAL;
518
519 if (!port)
520 goto err;
521
522 ret = -EMSGSIZE;
523 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
524 goto err;
525 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
526 goto err;
527
528 return 0;
529
530err:
531 return ret;
532}
533
534int ipvlan_link_new(struct net *src_net, struct net_device *dev,
535 struct nlattr *tb[], struct nlattr *data[],
536 struct netlink_ext_ack *extack)
537{
538 struct ipvl_dev *ipvlan = netdev_priv(dev);
539 struct ipvl_port *port;
540 struct net_device *phy_dev;
541 int err;
542 u16 mode = IPVLAN_MODE_L3;
543
544 if (!tb[IFLA_LINK])
545 return -EINVAL;
546
547 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
548 if (!phy_dev)
549 return -ENODEV;
550
551 if (netif_is_ipvlan(phy_dev)) {
552 struct ipvl_dev *tmp = netdev_priv(phy_dev);
553
554 phy_dev = tmp->phy_dev;
555 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
556 return -EPERM;
557 } else if (!netif_is_ipvlan_port(phy_dev)) {
558 /* Exit early if the underlying link is invalid or busy */
559 if (phy_dev->type != ARPHRD_ETHER ||
560 phy_dev->flags & IFF_LOOPBACK) {
561 netdev_err(phy_dev,
562 "Master is either lo or non-ether device\n");
563 return -EINVAL;
564 }
565
566 if (netdev_is_rx_handler_busy(phy_dev)) {
567 netdev_err(phy_dev, "Device is already in use.\n");
568 return -EBUSY;
569 }
570 }
571
572 ipvlan->phy_dev = phy_dev;
573 ipvlan->dev = dev;
574 ipvlan->sfeatures = IPVLAN_FEATURES;
575 if (!tb[IFLA_MTU])
576 ipvlan_adjust_mtu(ipvlan, phy_dev);
577 INIT_LIST_HEAD(&ipvlan->addrs);
578 spin_lock_init(&ipvlan->addrs_lock);
579
580 /* TODO Probably put random address here to be presented to the
581 * world but keep using the physical-dev address for the outgoing
582 * packets.
583 */
584 eth_hw_addr_set(dev, phy_dev->dev_addr);
585
586 dev->priv_flags |= IFF_NO_RX_HANDLER;
587
588 err = register_netdevice(dev);
589 if (err < 0)
590 return err;
591
592 /* ipvlan_init() would have created the port, if required */
593 port = ipvlan_port_get_rtnl(phy_dev);
594 ipvlan->port = port;
595
596 /* If the port-id base is at the MAX value, then wrap it around and
597 * begin from 0x1 again. This may be due to a busy system where lots
598 * of slaves are getting created and deleted.
599 */
600 if (port->dev_id_start == 0xFFFE)
601 port->dev_id_start = 0x1;
602
603 /* Since L2 address is shared among all IPvlan slaves including
604 * master, use unique 16 bit dev-ids to differentiate among them.
605 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
606 * slave link [see addrconf_ifid_eui48()].
607 */
608 err = ida_alloc_range(&port->ida, port->dev_id_start, 0xFFFD,
609 GFP_KERNEL);
610 if (err < 0)
611 err = ida_alloc_range(&port->ida, 0x1, port->dev_id_start - 1,
612 GFP_KERNEL);
613 if (err < 0)
614 goto unregister_netdev;
615 dev->dev_id = err;
616
617 /* Increment id-base to the next slot for the future assignment */
618 port->dev_id_start = err + 1;
619
620 err = netdev_upper_dev_link(phy_dev, dev, extack);
621 if (err)
622 goto remove_ida;
623
624 /* Flags are per port and latest update overrides. User has
625 * to be consistent in setting it just like the mode attribute.
626 */
627 if (data && data[IFLA_IPVLAN_FLAGS])
628 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
629
630 if (data && data[IFLA_IPVLAN_MODE])
631 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
632
633 err = ipvlan_set_port_mode(port, mode, extack);
634 if (err)
635 goto unlink_netdev;
636
637 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
638 netif_stacked_transfer_operstate(phy_dev, dev);
639 return 0;
640
641unlink_netdev:
642 netdev_upper_dev_unlink(phy_dev, dev);
643remove_ida:
644 ida_free(&port->ida, dev->dev_id);
645unregister_netdev:
646 unregister_netdevice(dev);
647 return err;
648}
649EXPORT_SYMBOL_GPL(ipvlan_link_new);
650
651void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
652{
653 struct ipvl_dev *ipvlan = netdev_priv(dev);
654 struct ipvl_addr *addr, *next;
655
656 spin_lock_bh(&ipvlan->addrs_lock);
657 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
658 ipvlan_ht_addr_del(addr);
659 list_del_rcu(&addr->anode);
660 kfree_rcu(addr, rcu);
661 }
662 spin_unlock_bh(&ipvlan->addrs_lock);
663
664 ida_free(&ipvlan->port->ida, dev->dev_id);
665 list_del_rcu(&ipvlan->pnode);
666 unregister_netdevice_queue(dev, head);
667 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
668}
669EXPORT_SYMBOL_GPL(ipvlan_link_delete);
670
671void ipvlan_link_setup(struct net_device *dev)
672{
673 ether_setup(dev);
674
675 dev->max_mtu = ETH_MAX_MTU;
676 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
677 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
678 dev->netdev_ops = &ipvlan_netdev_ops;
679 dev->needs_free_netdev = true;
680 dev->header_ops = &ipvlan_header_ops;
681 dev->ethtool_ops = &ipvlan_ethtool_ops;
682}
683EXPORT_SYMBOL_GPL(ipvlan_link_setup);
684
685static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
686{
687 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
688 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
689};
690
691static struct net *ipvlan_get_link_net(const struct net_device *dev)
692{
693 struct ipvl_dev *ipvlan = netdev_priv(dev);
694
695 return dev_net(ipvlan->phy_dev);
696}
697
698static 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 .get_link_net = ipvlan_get_link_net,
706};
707
708int ipvlan_link_register(struct rtnl_link_ops *ops)
709{
710 ops->get_size = ipvlan_nl_getsize;
711 ops->policy = ipvlan_nl_policy;
712 ops->validate = ipvlan_nl_validate;
713 ops->fill_info = ipvlan_nl_fillinfo;
714 ops->changelink = ipvlan_nl_changelink;
715 ops->maxtype = IFLA_IPVLAN_MAX;
716 return rtnl_link_register(ops);
717}
718EXPORT_SYMBOL_GPL(ipvlan_link_register);
719
720static int ipvlan_device_event(struct notifier_block *unused,
721 unsigned long event, void *ptr)
722{
723 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
724 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
725 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
726 struct ipvl_dev *ipvlan, *next;
727 struct ipvl_port *port;
728 LIST_HEAD(lst_kill);
729 int err;
730
731 if (!netif_is_ipvlan_port(dev))
732 return NOTIFY_DONE;
733
734 port = ipvlan_port_get_rtnl(dev);
735
736 switch (event) {
737 case NETDEV_UP:
738 case NETDEV_CHANGE:
739 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
740 netif_stacked_transfer_operstate(ipvlan->phy_dev,
741 ipvlan->dev);
742 break;
743
744 case NETDEV_REGISTER: {
745 struct net *oldnet, *newnet = dev_net(dev);
746
747 oldnet = read_pnet(&port->pnet);
748 if (net_eq(newnet, oldnet))
749 break;
750
751 write_pnet(&port->pnet, newnet);
752
753 if (port->mode == IPVLAN_MODE_L3S)
754 ipvlan_migrate_l3s_hook(oldnet, newnet);
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, pnode)
762 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
763 &lst_kill);
764 unregister_netdevice_many(&lst_kill);
765 break;
766
767 case NETDEV_FEAT_CHANGE:
768 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
769 netif_inherit_tso_max(ipvlan->dev, dev);
770 netdev_update_features(ipvlan->dev);
771 }
772 break;
773
774 case NETDEV_CHANGEMTU:
775 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
776 ipvlan_adjust_mtu(ipvlan, dev);
777 break;
778
779 case NETDEV_PRE_CHANGEADDR:
780 prechaddr_info = ptr;
781 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
782 err = dev_pre_changeaddr_notify(ipvlan->dev,
783 prechaddr_info->dev_addr,
784 extack);
785 if (err)
786 return notifier_from_errno(err);
787 }
788 break;
789
790 case NETDEV_CHANGEADDR:
791 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
792 eth_hw_addr_set(ipvlan->dev, dev->dev_addr);
793 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
794 }
795 break;
796
797 case NETDEV_PRE_TYPE_CHANGE:
798 /* Forbid underlying device to change its type. */
799 return NOTIFY_BAD;
800 }
801 return NOTIFY_DONE;
802}
803
804/* the caller must held the addrs lock */
805static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
806{
807 struct ipvl_addr *addr;
808
809 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
810 if (!addr)
811 return -ENOMEM;
812
813 addr->master = ipvlan;
814 if (!is_v6) {
815 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
816 addr->atype = IPVL_IPV4;
817#if IS_ENABLED(CONFIG_IPV6)
818 } else {
819 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
820 addr->atype = IPVL_IPV6;
821#endif
822 }
823
824 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
825
826 /* If the interface is not up, the address will be added to the hash
827 * list by ipvlan_open.
828 */
829 if (netif_running(ipvlan->dev))
830 ipvlan_ht_addr_add(ipvlan, addr);
831
832 return 0;
833}
834
835static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
836{
837 struct ipvl_addr *addr;
838
839 spin_lock_bh(&ipvlan->addrs_lock);
840 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
841 if (!addr) {
842 spin_unlock_bh(&ipvlan->addrs_lock);
843 return;
844 }
845
846 ipvlan_ht_addr_del(addr);
847 list_del_rcu(&addr->anode);
848 spin_unlock_bh(&ipvlan->addrs_lock);
849 kfree_rcu(addr, rcu);
850}
851
852static bool ipvlan_is_valid_dev(const struct net_device *dev)
853{
854 struct ipvl_dev *ipvlan = netdev_priv(dev);
855
856 if (!netif_is_ipvlan(dev))
857 return false;
858
859 if (!ipvlan || !ipvlan->port)
860 return false;
861
862 return true;
863}
864
865#if IS_ENABLED(CONFIG_IPV6)
866static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
867{
868 int ret = -EINVAL;
869
870 spin_lock_bh(&ipvlan->addrs_lock);
871 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
872 netif_err(ipvlan, ifup, ipvlan->dev,
873 "Failed to add IPv6=%pI6c addr for %s intf\n",
874 ip6_addr, ipvlan->dev->name);
875 else
876 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
877 spin_unlock_bh(&ipvlan->addrs_lock);
878 return ret;
879}
880
881static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
882{
883 return ipvlan_del_addr(ipvlan, ip6_addr, true);
884}
885
886static int ipvlan_addr6_event(struct notifier_block *unused,
887 unsigned long event, void *ptr)
888{
889 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
890 struct net_device *dev = (struct net_device *)if6->idev->dev;
891 struct ipvl_dev *ipvlan = netdev_priv(dev);
892
893 if (!ipvlan_is_valid_dev(dev))
894 return NOTIFY_DONE;
895
896 switch (event) {
897 case NETDEV_UP:
898 if (ipvlan_add_addr6(ipvlan, &if6->addr))
899 return NOTIFY_BAD;
900 break;
901
902 case NETDEV_DOWN:
903 ipvlan_del_addr6(ipvlan, &if6->addr);
904 break;
905 }
906
907 return NOTIFY_OK;
908}
909
910static int ipvlan_addr6_validator_event(struct notifier_block *unused,
911 unsigned long event, void *ptr)
912{
913 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
914 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
915 struct ipvl_dev *ipvlan = netdev_priv(dev);
916
917 if (!ipvlan_is_valid_dev(dev))
918 return NOTIFY_DONE;
919
920 switch (event) {
921 case NETDEV_UP:
922 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
923 NL_SET_ERR_MSG(i6vi->extack,
924 "Address already assigned to an ipvlan device");
925 return notifier_from_errno(-EADDRINUSE);
926 }
927 break;
928 }
929
930 return NOTIFY_OK;
931}
932#endif
933
934static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
935{
936 int ret = -EINVAL;
937
938 spin_lock_bh(&ipvlan->addrs_lock);
939 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
940 netif_err(ipvlan, ifup, ipvlan->dev,
941 "Failed to add IPv4=%pI4 on %s intf.\n",
942 ip4_addr, ipvlan->dev->name);
943 else
944 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
945 spin_unlock_bh(&ipvlan->addrs_lock);
946 return ret;
947}
948
949static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
950{
951 return ipvlan_del_addr(ipvlan, ip4_addr, false);
952}
953
954static int ipvlan_addr4_event(struct notifier_block *unused,
955 unsigned long event, void *ptr)
956{
957 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
958 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
959 struct ipvl_dev *ipvlan = netdev_priv(dev);
960 struct in_addr ip4_addr;
961
962 if (!ipvlan_is_valid_dev(dev))
963 return NOTIFY_DONE;
964
965 switch (event) {
966 case NETDEV_UP:
967 ip4_addr.s_addr = if4->ifa_address;
968 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
969 return NOTIFY_BAD;
970 break;
971
972 case NETDEV_DOWN:
973 ip4_addr.s_addr = if4->ifa_address;
974 ipvlan_del_addr4(ipvlan, &ip4_addr);
975 break;
976 }
977
978 return NOTIFY_OK;
979}
980
981static int ipvlan_addr4_validator_event(struct notifier_block *unused,
982 unsigned long event, void *ptr)
983{
984 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
985 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
986 struct ipvl_dev *ipvlan = netdev_priv(dev);
987
988 if (!ipvlan_is_valid_dev(dev))
989 return NOTIFY_DONE;
990
991 switch (event) {
992 case NETDEV_UP:
993 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
994 NL_SET_ERR_MSG(ivi->extack,
995 "Address already assigned to an ipvlan device");
996 return notifier_from_errno(-EADDRINUSE);
997 }
998 break;
999 }
1000
1001 return NOTIFY_OK;
1002}
1003
1004static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
1005 .notifier_call = ipvlan_addr4_event,
1006};
1007
1008static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
1009 .notifier_call = ipvlan_addr4_validator_event,
1010};
1011
1012static struct notifier_block ipvlan_notifier_block __read_mostly = {
1013 .notifier_call = ipvlan_device_event,
1014};
1015
1016#if IS_ENABLED(CONFIG_IPV6)
1017static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1018 .notifier_call = ipvlan_addr6_event,
1019};
1020
1021static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1022 .notifier_call = ipvlan_addr6_validator_event,
1023};
1024#endif
1025
1026static int __init ipvlan_init_module(void)
1027{
1028 int err;
1029
1030 ipvlan_init_secret();
1031 register_netdevice_notifier(&ipvlan_notifier_block);
1032#if IS_ENABLED(CONFIG_IPV6)
1033 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1034 register_inet6addr_validator_notifier(
1035 &ipvlan_addr6_vtor_notifier_block);
1036#endif
1037 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1038 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1039
1040 err = ipvlan_l3s_init();
1041 if (err < 0)
1042 goto error;
1043
1044 err = ipvlan_link_register(&ipvlan_link_ops);
1045 if (err < 0) {
1046 ipvlan_l3s_cleanup();
1047 goto error;
1048 }
1049
1050 return 0;
1051error:
1052 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1053 unregister_inetaddr_validator_notifier(
1054 &ipvlan_addr4_vtor_notifier_block);
1055#if IS_ENABLED(CONFIG_IPV6)
1056 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1057 unregister_inet6addr_validator_notifier(
1058 &ipvlan_addr6_vtor_notifier_block);
1059#endif
1060 unregister_netdevice_notifier(&ipvlan_notifier_block);
1061 return err;
1062}
1063
1064static void __exit ipvlan_cleanup_module(void)
1065{
1066 rtnl_link_unregister(&ipvlan_link_ops);
1067 ipvlan_l3s_cleanup();
1068 unregister_netdevice_notifier(&ipvlan_notifier_block);
1069 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1070 unregister_inetaddr_validator_notifier(
1071 &ipvlan_addr4_vtor_notifier_block);
1072#if IS_ENABLED(CONFIG_IPV6)
1073 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1074 unregister_inet6addr_validator_notifier(
1075 &ipvlan_addr6_vtor_notifier_block);
1076#endif
1077}
1078
1079module_init(ipvlan_init_module);
1080module_exit(ipvlan_cleanup_module);
1081
1082MODULE_LICENSE("GPL");
1083MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1084MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1085MODULE_ALIAS_RTNL_LINK("ipvlan");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
3 */
4
5#include "ipvlan.h"
6
7static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
8 struct netlink_ext_ack *extack)
9{
10 struct ipvl_dev *ipvlan;
11 unsigned int flags;
12 int err;
13
14 ASSERT_RTNL();
15 if (port->mode != nval) {
16 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
17 flags = ipvlan->dev->flags;
18 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
19 err = dev_change_flags(ipvlan->dev,
20 flags | IFF_NOARP,
21 extack);
22 } else {
23 err = dev_change_flags(ipvlan->dev,
24 flags & ~IFF_NOARP,
25 extack);
26 }
27 if (unlikely(err))
28 goto fail;
29 }
30 if (nval == IPVLAN_MODE_L3S) {
31 /* New mode is L3S */
32 err = ipvlan_l3s_register(port);
33 if (err)
34 goto fail;
35 } else if (port->mode == IPVLAN_MODE_L3S) {
36 /* Old mode was L3S */
37 ipvlan_l3s_unregister(port);
38 }
39 port->mode = nval;
40 }
41 return 0;
42
43fail:
44 /* Undo the flags changes that have been done so far. */
45 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
46 flags = ipvlan->dev->flags;
47 if (port->mode == IPVLAN_MODE_L3 ||
48 port->mode == IPVLAN_MODE_L3S)
49 dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
50 NULL);
51 else
52 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
53 NULL);
54 }
55
56 return err;
57}
58
59static int ipvlan_port_create(struct net_device *dev)
60{
61 struct ipvl_port *port;
62 int err, idx;
63
64 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
65 if (!port)
66 return -ENOMEM;
67
68 write_pnet(&port->pnet, dev_net(dev));
69 port->dev = dev;
70 port->mode = IPVLAN_MODE_L3;
71 INIT_LIST_HEAD(&port->ipvlans);
72 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
73 INIT_HLIST_HEAD(&port->hlhead[idx]);
74
75 skb_queue_head_init(&port->backlog);
76 INIT_WORK(&port->wq, ipvlan_process_multicast);
77 ida_init(&port->ida);
78 port->dev_id_start = 1;
79
80 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
81 if (err)
82 goto err;
83
84 return 0;
85
86err:
87 kfree(port);
88 return err;
89}
90
91static void ipvlan_port_destroy(struct net_device *dev)
92{
93 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
94 struct sk_buff *skb;
95
96 if (port->mode == IPVLAN_MODE_L3S)
97 ipvlan_l3s_unregister(port);
98 netdev_rx_handler_unregister(dev);
99 cancel_work_sync(&port->wq);
100 while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
101 if (skb->dev)
102 dev_put(skb->dev);
103 kfree_skb(skb);
104 }
105 ida_destroy(&port->ida);
106 kfree(port);
107}
108
109#define IPVLAN_ALWAYS_ON_OFLOADS \
110 (NETIF_F_SG | NETIF_F_HW_CSUM | \
111 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
112
113#define IPVLAN_ALWAYS_ON \
114 (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED)
115
116#define IPVLAN_FEATURES \
117 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
118 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
119 NETIF_F_GRO | NETIF_F_RXCSUM | \
120 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
121
122 /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
123
124#define IPVLAN_STATE_MASK \
125 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
126
127static int ipvlan_init(struct net_device *dev)
128{
129 struct ipvl_dev *ipvlan = netdev_priv(dev);
130 struct net_device *phy_dev = ipvlan->phy_dev;
131 struct ipvl_port *port;
132 int err;
133
134 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
135 (phy_dev->state & IPVLAN_STATE_MASK);
136 dev->features = phy_dev->features & IPVLAN_FEATURES;
137 dev->features |= IPVLAN_ALWAYS_ON;
138 dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
139 dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
140 dev->hw_enc_features |= dev->features;
141 dev->gso_max_size = phy_dev->gso_max_size;
142 dev->gso_max_segs = phy_dev->gso_max_segs;
143 dev->hard_header_len = phy_dev->hard_header_len;
144
145 netdev_lockdep_set_classes(dev);
146
147 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
148 if (!ipvlan->pcpu_stats)
149 return -ENOMEM;
150
151 if (!netif_is_ipvlan_port(phy_dev)) {
152 err = ipvlan_port_create(phy_dev);
153 if (err < 0) {
154 free_percpu(ipvlan->pcpu_stats);
155 return err;
156 }
157 }
158 port = ipvlan_port_get_rtnl(phy_dev);
159 port->count += 1;
160 return 0;
161}
162
163static void ipvlan_uninit(struct net_device *dev)
164{
165 struct ipvl_dev *ipvlan = netdev_priv(dev);
166 struct net_device *phy_dev = ipvlan->phy_dev;
167 struct ipvl_port *port;
168
169 free_percpu(ipvlan->pcpu_stats);
170
171 port = ipvlan_port_get_rtnl(phy_dev);
172 port->count -= 1;
173 if (!port->count)
174 ipvlan_port_destroy(port->dev);
175}
176
177static int ipvlan_open(struct net_device *dev)
178{
179 struct ipvl_dev *ipvlan = netdev_priv(dev);
180 struct ipvl_addr *addr;
181
182 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
183 ipvlan->port->mode == IPVLAN_MODE_L3S)
184 dev->flags |= IFF_NOARP;
185 else
186 dev->flags &= ~IFF_NOARP;
187
188 rcu_read_lock();
189 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
190 ipvlan_ht_addr_add(ipvlan, addr);
191 rcu_read_unlock();
192
193 return 0;
194}
195
196static int ipvlan_stop(struct net_device *dev)
197{
198 struct ipvl_dev *ipvlan = netdev_priv(dev);
199 struct net_device *phy_dev = ipvlan->phy_dev;
200 struct ipvl_addr *addr;
201
202 dev_uc_unsync(phy_dev, dev);
203 dev_mc_unsync(phy_dev, dev);
204
205 rcu_read_lock();
206 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
207 ipvlan_ht_addr_del(addr);
208 rcu_read_unlock();
209
210 return 0;
211}
212
213static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
214 struct net_device *dev)
215{
216 const struct ipvl_dev *ipvlan = netdev_priv(dev);
217 int skblen = skb->len;
218 int ret;
219
220 ret = ipvlan_queue_xmit(skb, dev);
221 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
222 struct ipvl_pcpu_stats *pcptr;
223
224 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
225
226 u64_stats_update_begin(&pcptr->syncp);
227 pcptr->tx_pkts++;
228 pcptr->tx_bytes += skblen;
229 u64_stats_update_end(&pcptr->syncp);
230 } else {
231 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
232 }
233 return ret;
234}
235
236static netdev_features_t ipvlan_fix_features(struct net_device *dev,
237 netdev_features_t features)
238{
239 struct ipvl_dev *ipvlan = netdev_priv(dev);
240
241 features |= NETIF_F_ALL_FOR_ALL;
242 features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES);
243 features = netdev_increment_features(ipvlan->phy_dev->features,
244 features, features);
245 features |= IPVLAN_ALWAYS_ON;
246 features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON);
247
248 return features;
249}
250
251static void ipvlan_change_rx_flags(struct net_device *dev, int change)
252{
253 struct ipvl_dev *ipvlan = netdev_priv(dev);
254 struct net_device *phy_dev = ipvlan->phy_dev;
255
256 if (change & IFF_ALLMULTI)
257 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
258}
259
260static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
261{
262 struct ipvl_dev *ipvlan = netdev_priv(dev);
263
264 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
265 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
266 } else {
267 struct netdev_hw_addr *ha;
268 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
269
270 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
271 netdev_for_each_mc_addr(ha, dev)
272 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
273
274 /* Turn-on broadcast bit irrespective of address family,
275 * since broadcast is deferred to a work-queue, hence no
276 * impact on fast-path processing.
277 */
278 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
279
280 bitmap_copy(ipvlan->mac_filters, mc_filters,
281 IPVLAN_MAC_FILTER_SIZE);
282 }
283 dev_uc_sync(ipvlan->phy_dev, dev);
284 dev_mc_sync(ipvlan->phy_dev, dev);
285}
286
287static void ipvlan_get_stats64(struct net_device *dev,
288 struct rtnl_link_stats64 *s)
289{
290 struct ipvl_dev *ipvlan = netdev_priv(dev);
291
292 if (ipvlan->pcpu_stats) {
293 struct ipvl_pcpu_stats *pcptr;
294 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
295 u32 rx_errs = 0, tx_drps = 0;
296 u32 strt;
297 int idx;
298
299 for_each_possible_cpu(idx) {
300 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
301 do {
302 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
303 rx_pkts = pcptr->rx_pkts;
304 rx_bytes = pcptr->rx_bytes;
305 rx_mcast = pcptr->rx_mcast;
306 tx_pkts = pcptr->tx_pkts;
307 tx_bytes = pcptr->tx_bytes;
308 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
309 strt));
310
311 s->rx_packets += rx_pkts;
312 s->rx_bytes += rx_bytes;
313 s->multicast += rx_mcast;
314 s->tx_packets += tx_pkts;
315 s->tx_bytes += tx_bytes;
316
317 /* u32 values are updated without syncp protection. */
318 rx_errs += pcptr->rx_errs;
319 tx_drps += pcptr->tx_drps;
320 }
321 s->rx_errors = rx_errs;
322 s->rx_dropped = rx_errs;
323 s->tx_dropped = tx_drps;
324 }
325}
326
327static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
328{
329 struct ipvl_dev *ipvlan = netdev_priv(dev);
330 struct net_device *phy_dev = ipvlan->phy_dev;
331
332 return vlan_vid_add(phy_dev, proto, vid);
333}
334
335static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
336 u16 vid)
337{
338 struct ipvl_dev *ipvlan = netdev_priv(dev);
339 struct net_device *phy_dev = ipvlan->phy_dev;
340
341 vlan_vid_del(phy_dev, proto, vid);
342 return 0;
343}
344
345static int ipvlan_get_iflink(const struct net_device *dev)
346{
347 struct ipvl_dev *ipvlan = netdev_priv(dev);
348
349 return ipvlan->phy_dev->ifindex;
350}
351
352static const struct net_device_ops ipvlan_netdev_ops = {
353 .ndo_init = ipvlan_init,
354 .ndo_uninit = ipvlan_uninit,
355 .ndo_open = ipvlan_open,
356 .ndo_stop = ipvlan_stop,
357 .ndo_start_xmit = ipvlan_start_xmit,
358 .ndo_fix_features = ipvlan_fix_features,
359 .ndo_change_rx_flags = ipvlan_change_rx_flags,
360 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
361 .ndo_get_stats64 = ipvlan_get_stats64,
362 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
363 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
364 .ndo_get_iflink = ipvlan_get_iflink,
365};
366
367static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
368 unsigned short type, const void *daddr,
369 const void *saddr, unsigned len)
370{
371 const struct ipvl_dev *ipvlan = netdev_priv(dev);
372 struct net_device *phy_dev = ipvlan->phy_dev;
373
374 /* TODO Probably use a different field than dev_addr so that the
375 * mac-address on the virtual device is portable and can be carried
376 * while the packets use the mac-addr on the physical device.
377 */
378 return dev_hard_header(skb, phy_dev, type, daddr,
379 saddr ? : phy_dev->dev_addr, len);
380}
381
382static const struct header_ops ipvlan_header_ops = {
383 .create = ipvlan_hard_header,
384 .parse = eth_header_parse,
385 .cache = eth_header_cache,
386 .cache_update = eth_header_cache_update,
387};
388
389static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
390{
391 ipvlan->dev->mtu = dev->mtu;
392}
393
394static bool netif_is_ipvlan(const struct net_device *dev)
395{
396 /* both ipvlan and ipvtap devices use the same netdev_ops */
397 return dev->netdev_ops == &ipvlan_netdev_ops;
398}
399
400static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
401 struct ethtool_link_ksettings *cmd)
402{
403 const struct ipvl_dev *ipvlan = netdev_priv(dev);
404
405 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
406}
407
408static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
409 struct ethtool_drvinfo *drvinfo)
410{
411 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
412 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
413}
414
415static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
416{
417 const struct ipvl_dev *ipvlan = netdev_priv(dev);
418
419 return ipvlan->msg_enable;
420}
421
422static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
423{
424 struct ipvl_dev *ipvlan = netdev_priv(dev);
425
426 ipvlan->msg_enable = value;
427}
428
429static const struct ethtool_ops ipvlan_ethtool_ops = {
430 .get_link = ethtool_op_get_link,
431 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
432 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
433 .get_msglevel = ipvlan_ethtool_get_msglevel,
434 .set_msglevel = ipvlan_ethtool_set_msglevel,
435};
436
437static int ipvlan_nl_changelink(struct net_device *dev,
438 struct nlattr *tb[], struct nlattr *data[],
439 struct netlink_ext_ack *extack)
440{
441 struct ipvl_dev *ipvlan = netdev_priv(dev);
442 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
443 int err = 0;
444
445 if (!data)
446 return 0;
447 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
448 return -EPERM;
449
450 if (data[IFLA_IPVLAN_MODE]) {
451 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
452
453 err = ipvlan_set_port_mode(port, nmode, extack);
454 }
455
456 if (!err && data[IFLA_IPVLAN_FLAGS]) {
457 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
458
459 if (flags & IPVLAN_F_PRIVATE)
460 ipvlan_mark_private(port);
461 else
462 ipvlan_clear_private(port);
463
464 if (flags & IPVLAN_F_VEPA)
465 ipvlan_mark_vepa(port);
466 else
467 ipvlan_clear_vepa(port);
468 }
469
470 return err;
471}
472
473static size_t ipvlan_nl_getsize(const struct net_device *dev)
474{
475 return (0
476 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
477 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
478 );
479}
480
481static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
482 struct netlink_ext_ack *extack)
483{
484 if (!data)
485 return 0;
486
487 if (data[IFLA_IPVLAN_MODE]) {
488 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
489
490 if (mode >= IPVLAN_MODE_MAX)
491 return -EINVAL;
492 }
493 if (data[IFLA_IPVLAN_FLAGS]) {
494 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
495
496 /* Only two bits are used at this moment. */
497 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
498 return -EINVAL;
499 /* Also both flags can't be active at the same time. */
500 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
501 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
502 return -EINVAL;
503 }
504
505 return 0;
506}
507
508static int ipvlan_nl_fillinfo(struct sk_buff *skb,
509 const struct net_device *dev)
510{
511 struct ipvl_dev *ipvlan = netdev_priv(dev);
512 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
513 int ret = -EINVAL;
514
515 if (!port)
516 goto err;
517
518 ret = -EMSGSIZE;
519 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
520 goto err;
521 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
522 goto err;
523
524 return 0;
525
526err:
527 return ret;
528}
529
530int ipvlan_link_new(struct net *src_net, struct net_device *dev,
531 struct nlattr *tb[], struct nlattr *data[],
532 struct netlink_ext_ack *extack)
533{
534 struct ipvl_dev *ipvlan = netdev_priv(dev);
535 struct ipvl_port *port;
536 struct net_device *phy_dev;
537 int err;
538 u16 mode = IPVLAN_MODE_L3;
539
540 if (!tb[IFLA_LINK])
541 return -EINVAL;
542
543 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
544 if (!phy_dev)
545 return -ENODEV;
546
547 if (netif_is_ipvlan(phy_dev)) {
548 struct ipvl_dev *tmp = netdev_priv(phy_dev);
549
550 phy_dev = tmp->phy_dev;
551 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
552 return -EPERM;
553 } else if (!netif_is_ipvlan_port(phy_dev)) {
554 /* Exit early if the underlying link is invalid or busy */
555 if (phy_dev->type != ARPHRD_ETHER ||
556 phy_dev->flags & IFF_LOOPBACK) {
557 netdev_err(phy_dev,
558 "Master is either lo or non-ether device\n");
559 return -EINVAL;
560 }
561
562 if (netdev_is_rx_handler_busy(phy_dev)) {
563 netdev_err(phy_dev, "Device is already in use.\n");
564 return -EBUSY;
565 }
566 }
567
568 ipvlan->phy_dev = phy_dev;
569 ipvlan->dev = dev;
570 ipvlan->sfeatures = IPVLAN_FEATURES;
571 if (!tb[IFLA_MTU])
572 ipvlan_adjust_mtu(ipvlan, phy_dev);
573 INIT_LIST_HEAD(&ipvlan->addrs);
574 spin_lock_init(&ipvlan->addrs_lock);
575
576 /* TODO Probably put random address here to be presented to the
577 * world but keep using the physical-dev address for the outgoing
578 * packets.
579 */
580 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
581
582 dev->priv_flags |= IFF_NO_RX_HANDLER;
583
584 err = register_netdevice(dev);
585 if (err < 0)
586 return err;
587
588 /* ipvlan_init() would have created the port, if required */
589 port = ipvlan_port_get_rtnl(phy_dev);
590 ipvlan->port = port;
591
592 /* If the port-id base is at the MAX value, then wrap it around and
593 * begin from 0x1 again. This may be due to a busy system where lots
594 * of slaves are getting created and deleted.
595 */
596 if (port->dev_id_start == 0xFFFE)
597 port->dev_id_start = 0x1;
598
599 /* Since L2 address is shared among all IPvlan slaves including
600 * master, use unique 16 bit dev-ids to diffentiate among them.
601 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
602 * slave link [see addrconf_ifid_eui48()].
603 */
604 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
605 GFP_KERNEL);
606 if (err < 0)
607 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
608 GFP_KERNEL);
609 if (err < 0)
610 goto unregister_netdev;
611 dev->dev_id = err;
612
613 /* Increment id-base to the next slot for the future assignment */
614 port->dev_id_start = err + 1;
615
616 err = netdev_upper_dev_link(phy_dev, dev, extack);
617 if (err)
618 goto remove_ida;
619
620 /* Flags are per port and latest update overrides. User has
621 * to be consistent in setting it just like the mode attribute.
622 */
623 if (data && data[IFLA_IPVLAN_FLAGS])
624 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
625
626 if (data && data[IFLA_IPVLAN_MODE])
627 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
628
629 err = ipvlan_set_port_mode(port, mode, extack);
630 if (err)
631 goto unlink_netdev;
632
633 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
634 netif_stacked_transfer_operstate(phy_dev, dev);
635 return 0;
636
637unlink_netdev:
638 netdev_upper_dev_unlink(phy_dev, dev);
639remove_ida:
640 ida_simple_remove(&port->ida, dev->dev_id);
641unregister_netdev:
642 unregister_netdevice(dev);
643 return err;
644}
645EXPORT_SYMBOL_GPL(ipvlan_link_new);
646
647void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
648{
649 struct ipvl_dev *ipvlan = netdev_priv(dev);
650 struct ipvl_addr *addr, *next;
651
652 spin_lock_bh(&ipvlan->addrs_lock);
653 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
654 ipvlan_ht_addr_del(addr);
655 list_del_rcu(&addr->anode);
656 kfree_rcu(addr, rcu);
657 }
658 spin_unlock_bh(&ipvlan->addrs_lock);
659
660 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
661 list_del_rcu(&ipvlan->pnode);
662 unregister_netdevice_queue(dev, head);
663 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
664}
665EXPORT_SYMBOL_GPL(ipvlan_link_delete);
666
667void ipvlan_link_setup(struct net_device *dev)
668{
669 ether_setup(dev);
670
671 dev->max_mtu = ETH_MAX_MTU;
672 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
673 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
674 dev->netdev_ops = &ipvlan_netdev_ops;
675 dev->needs_free_netdev = true;
676 dev->header_ops = &ipvlan_header_ops;
677 dev->ethtool_ops = &ipvlan_ethtool_ops;
678}
679EXPORT_SYMBOL_GPL(ipvlan_link_setup);
680
681static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
682{
683 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
684 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
685};
686
687static struct rtnl_link_ops ipvlan_link_ops = {
688 .kind = "ipvlan",
689 .priv_size = sizeof(struct ipvl_dev),
690
691 .setup = ipvlan_link_setup,
692 .newlink = ipvlan_link_new,
693 .dellink = ipvlan_link_delete,
694};
695
696int ipvlan_link_register(struct rtnl_link_ops *ops)
697{
698 ops->get_size = ipvlan_nl_getsize;
699 ops->policy = ipvlan_nl_policy;
700 ops->validate = ipvlan_nl_validate;
701 ops->fill_info = ipvlan_nl_fillinfo;
702 ops->changelink = ipvlan_nl_changelink;
703 ops->maxtype = IFLA_IPVLAN_MAX;
704 return rtnl_link_register(ops);
705}
706EXPORT_SYMBOL_GPL(ipvlan_link_register);
707
708static int ipvlan_device_event(struct notifier_block *unused,
709 unsigned long event, void *ptr)
710{
711 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
712 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
713 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
714 struct ipvl_dev *ipvlan, *next;
715 struct ipvl_port *port;
716 LIST_HEAD(lst_kill);
717 int err;
718
719 if (!netif_is_ipvlan_port(dev))
720 return NOTIFY_DONE;
721
722 port = ipvlan_port_get_rtnl(dev);
723
724 switch (event) {
725 case NETDEV_CHANGE:
726 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
727 netif_stacked_transfer_operstate(ipvlan->phy_dev,
728 ipvlan->dev);
729 break;
730
731 case NETDEV_REGISTER: {
732 struct net *oldnet, *newnet = dev_net(dev);
733
734 oldnet = read_pnet(&port->pnet);
735 if (net_eq(newnet, oldnet))
736 break;
737
738 write_pnet(&port->pnet, newnet);
739
740 ipvlan_migrate_l3s_hook(oldnet, newnet);
741 break;
742 }
743 case NETDEV_UNREGISTER:
744 if (dev->reg_state != NETREG_UNREGISTERING)
745 break;
746
747 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
748 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
749 &lst_kill);
750 unregister_netdevice_many(&lst_kill);
751 break;
752
753 case NETDEV_FEAT_CHANGE:
754 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
755 ipvlan->dev->gso_max_size = dev->gso_max_size;
756 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
757 netdev_update_features(ipvlan->dev);
758 }
759 break;
760
761 case NETDEV_CHANGEMTU:
762 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
763 ipvlan_adjust_mtu(ipvlan, dev);
764 break;
765
766 case NETDEV_PRE_CHANGEADDR:
767 prechaddr_info = ptr;
768 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
769 err = dev_pre_changeaddr_notify(ipvlan->dev,
770 prechaddr_info->dev_addr,
771 extack);
772 if (err)
773 return notifier_from_errno(err);
774 }
775 break;
776
777 case NETDEV_CHANGEADDR:
778 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
779 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
780 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
781 }
782 break;
783
784 case NETDEV_PRE_TYPE_CHANGE:
785 /* Forbid underlying device to change its type. */
786 return NOTIFY_BAD;
787 }
788 return NOTIFY_DONE;
789}
790
791/* the caller must held the addrs lock */
792static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
793{
794 struct ipvl_addr *addr;
795
796 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
797 if (!addr)
798 return -ENOMEM;
799
800 addr->master = ipvlan;
801 if (!is_v6) {
802 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
803 addr->atype = IPVL_IPV4;
804#if IS_ENABLED(CONFIG_IPV6)
805 } else {
806 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
807 addr->atype = IPVL_IPV6;
808#endif
809 }
810
811 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
812
813 /* If the interface is not up, the address will be added to the hash
814 * list by ipvlan_open.
815 */
816 if (netif_running(ipvlan->dev))
817 ipvlan_ht_addr_add(ipvlan, addr);
818
819 return 0;
820}
821
822static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
823{
824 struct ipvl_addr *addr;
825
826 spin_lock_bh(&ipvlan->addrs_lock);
827 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
828 if (!addr) {
829 spin_unlock_bh(&ipvlan->addrs_lock);
830 return;
831 }
832
833 ipvlan_ht_addr_del(addr);
834 list_del_rcu(&addr->anode);
835 spin_unlock_bh(&ipvlan->addrs_lock);
836 kfree_rcu(addr, rcu);
837}
838
839static bool ipvlan_is_valid_dev(const struct net_device *dev)
840{
841 struct ipvl_dev *ipvlan = netdev_priv(dev);
842
843 if (!netif_is_ipvlan(dev))
844 return false;
845
846 if (!ipvlan || !ipvlan->port)
847 return false;
848
849 return true;
850}
851
852#if IS_ENABLED(CONFIG_IPV6)
853static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
854{
855 int ret = -EINVAL;
856
857 spin_lock_bh(&ipvlan->addrs_lock);
858 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
859 netif_err(ipvlan, ifup, ipvlan->dev,
860 "Failed to add IPv6=%pI6c addr for %s intf\n",
861 ip6_addr, ipvlan->dev->name);
862 else
863 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
864 spin_unlock_bh(&ipvlan->addrs_lock);
865 return ret;
866}
867
868static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
869{
870 return ipvlan_del_addr(ipvlan, ip6_addr, true);
871}
872
873static int ipvlan_addr6_event(struct notifier_block *unused,
874 unsigned long event, void *ptr)
875{
876 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
877 struct net_device *dev = (struct net_device *)if6->idev->dev;
878 struct ipvl_dev *ipvlan = netdev_priv(dev);
879
880 if (!ipvlan_is_valid_dev(dev))
881 return NOTIFY_DONE;
882
883 switch (event) {
884 case NETDEV_UP:
885 if (ipvlan_add_addr6(ipvlan, &if6->addr))
886 return NOTIFY_BAD;
887 break;
888
889 case NETDEV_DOWN:
890 ipvlan_del_addr6(ipvlan, &if6->addr);
891 break;
892 }
893
894 return NOTIFY_OK;
895}
896
897static int ipvlan_addr6_validator_event(struct notifier_block *unused,
898 unsigned long event, void *ptr)
899{
900 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
901 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
902 struct ipvl_dev *ipvlan = netdev_priv(dev);
903
904 if (!ipvlan_is_valid_dev(dev))
905 return NOTIFY_DONE;
906
907 switch (event) {
908 case NETDEV_UP:
909 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
910 NL_SET_ERR_MSG(i6vi->extack,
911 "Address already assigned to an ipvlan device");
912 return notifier_from_errno(-EADDRINUSE);
913 }
914 break;
915 }
916
917 return NOTIFY_OK;
918}
919#endif
920
921static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
922{
923 int ret = -EINVAL;
924
925 spin_lock_bh(&ipvlan->addrs_lock);
926 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
927 netif_err(ipvlan, ifup, ipvlan->dev,
928 "Failed to add IPv4=%pI4 on %s intf.\n",
929 ip4_addr, ipvlan->dev->name);
930 else
931 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
932 spin_unlock_bh(&ipvlan->addrs_lock);
933 return ret;
934}
935
936static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
937{
938 return ipvlan_del_addr(ipvlan, ip4_addr, false);
939}
940
941static int ipvlan_addr4_event(struct notifier_block *unused,
942 unsigned long event, void *ptr)
943{
944 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
945 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
946 struct ipvl_dev *ipvlan = netdev_priv(dev);
947 struct in_addr ip4_addr;
948
949 if (!ipvlan_is_valid_dev(dev))
950 return NOTIFY_DONE;
951
952 switch (event) {
953 case NETDEV_UP:
954 ip4_addr.s_addr = if4->ifa_address;
955 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
956 return NOTIFY_BAD;
957 break;
958
959 case NETDEV_DOWN:
960 ip4_addr.s_addr = if4->ifa_address;
961 ipvlan_del_addr4(ipvlan, &ip4_addr);
962 break;
963 }
964
965 return NOTIFY_OK;
966}
967
968static int ipvlan_addr4_validator_event(struct notifier_block *unused,
969 unsigned long event, void *ptr)
970{
971 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
972 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
973 struct ipvl_dev *ipvlan = netdev_priv(dev);
974
975 if (!ipvlan_is_valid_dev(dev))
976 return NOTIFY_DONE;
977
978 switch (event) {
979 case NETDEV_UP:
980 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
981 NL_SET_ERR_MSG(ivi->extack,
982 "Address already assigned to an ipvlan device");
983 return notifier_from_errno(-EADDRINUSE);
984 }
985 break;
986 }
987
988 return NOTIFY_OK;
989}
990
991static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
992 .notifier_call = ipvlan_addr4_event,
993};
994
995static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
996 .notifier_call = ipvlan_addr4_validator_event,
997};
998
999static struct notifier_block ipvlan_notifier_block __read_mostly = {
1000 .notifier_call = ipvlan_device_event,
1001};
1002
1003#if IS_ENABLED(CONFIG_IPV6)
1004static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
1005 .notifier_call = ipvlan_addr6_event,
1006};
1007
1008static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
1009 .notifier_call = ipvlan_addr6_validator_event,
1010};
1011#endif
1012
1013static int __init ipvlan_init_module(void)
1014{
1015 int err;
1016
1017 ipvlan_init_secret();
1018 register_netdevice_notifier(&ipvlan_notifier_block);
1019#if IS_ENABLED(CONFIG_IPV6)
1020 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1021 register_inet6addr_validator_notifier(
1022 &ipvlan_addr6_vtor_notifier_block);
1023#endif
1024 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1025 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1026
1027 err = ipvlan_l3s_init();
1028 if (err < 0)
1029 goto error;
1030
1031 err = ipvlan_link_register(&ipvlan_link_ops);
1032 if (err < 0) {
1033 ipvlan_l3s_cleanup();
1034 goto error;
1035 }
1036
1037 return 0;
1038error:
1039 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1040 unregister_inetaddr_validator_notifier(
1041 &ipvlan_addr4_vtor_notifier_block);
1042#if IS_ENABLED(CONFIG_IPV6)
1043 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1044 unregister_inet6addr_validator_notifier(
1045 &ipvlan_addr6_vtor_notifier_block);
1046#endif
1047 unregister_netdevice_notifier(&ipvlan_notifier_block);
1048 return err;
1049}
1050
1051static void __exit ipvlan_cleanup_module(void)
1052{
1053 rtnl_link_unregister(&ipvlan_link_ops);
1054 ipvlan_l3s_cleanup();
1055 unregister_netdevice_notifier(&ipvlan_notifier_block);
1056 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1057 unregister_inetaddr_validator_notifier(
1058 &ipvlan_addr4_vtor_notifier_block);
1059#if IS_ENABLED(CONFIG_IPV6)
1060 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1061 unregister_inet6addr_validator_notifier(
1062 &ipvlan_addr6_vtor_notifier_block);
1063#endif
1064}
1065
1066module_init(ipvlan_init_module);
1067module_exit(ipvlan_cleanup_module);
1068
1069MODULE_LICENSE("GPL");
1070MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1071MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1072MODULE_ALIAS_RTNL_LINK("ipvlan");