1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
7 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
8 struct netlink_ext_ack *extack)
10 struct ipvl_dev *ipvlan;
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,
23 err = dev_change_flags(ipvlan->dev,
30 if (nval == IPVLAN_MODE_L3S) {
32 err = ipvlan_l3s_register(port);
35 } else if (port->mode == IPVLAN_MODE_L3S) {
36 /* Old mode was L3S */
37 ipvlan_l3s_unregister(port);
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,
52 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
59 static int ipvlan_port_create(struct net_device *dev)
61 struct ipvl_port *port;
64 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
68 write_pnet(&port->pnet, dev_net(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]);
75 skb_queue_head_init(&port->backlog);
76 INIT_WORK(&port->wq, ipvlan_process_multicast);
78 port->dev_id_start = 1;
80 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
91 static void ipvlan_port_destroy(struct net_device *dev)
93 struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
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) {
105 ida_destroy(&port->ida);
109 #define IPVLAN_FEATURES \
110 (NETIF_F_SG | NETIF_F_CSUM_MASK | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
111 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
112 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
113 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
115 #define IPVLAN_STATE_MASK \
116 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
118 static int ipvlan_init(struct net_device *dev)
120 struct ipvl_dev *ipvlan = netdev_priv(dev);
121 struct net_device *phy_dev = ipvlan->phy_dev;
122 struct ipvl_port *port;
125 dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
126 (phy_dev->state & IPVLAN_STATE_MASK);
127 dev->features = phy_dev->features & IPVLAN_FEATURES;
128 dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
129 dev->hw_enc_features |= dev->features;
130 dev->gso_max_size = phy_dev->gso_max_size;
131 dev->gso_max_segs = phy_dev->gso_max_segs;
132 dev->hard_header_len = phy_dev->hard_header_len;
134 netdev_lockdep_set_classes(dev);
136 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
137 if (!ipvlan->pcpu_stats)
140 if (!netif_is_ipvlan_port(phy_dev)) {
141 err = ipvlan_port_create(phy_dev);
143 free_percpu(ipvlan->pcpu_stats);
147 port = ipvlan_port_get_rtnl(phy_dev);
152 static void ipvlan_uninit(struct net_device *dev)
154 struct ipvl_dev *ipvlan = netdev_priv(dev);
155 struct net_device *phy_dev = ipvlan->phy_dev;
156 struct ipvl_port *port;
158 free_percpu(ipvlan->pcpu_stats);
160 port = ipvlan_port_get_rtnl(phy_dev);
163 ipvlan_port_destroy(port->dev);
166 static int ipvlan_open(struct net_device *dev)
168 struct ipvl_dev *ipvlan = netdev_priv(dev);
169 struct net_device *phy_dev = ipvlan->phy_dev;
170 struct ipvl_addr *addr;
172 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
173 ipvlan->port->mode == IPVLAN_MODE_L3S)
174 dev->flags |= IFF_NOARP;
176 dev->flags &= ~IFF_NOARP;
179 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
180 ipvlan_ht_addr_add(ipvlan, addr);
183 return dev_uc_add(phy_dev, phy_dev->dev_addr);
186 static int ipvlan_stop(struct net_device *dev)
188 struct ipvl_dev *ipvlan = netdev_priv(dev);
189 struct net_device *phy_dev = ipvlan->phy_dev;
190 struct ipvl_addr *addr;
192 dev_uc_unsync(phy_dev, dev);
193 dev_mc_unsync(phy_dev, dev);
195 dev_uc_del(phy_dev, phy_dev->dev_addr);
198 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
199 ipvlan_ht_addr_del(addr);
205 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
206 struct net_device *dev)
208 const struct ipvl_dev *ipvlan = netdev_priv(dev);
209 int skblen = skb->len;
212 ret = ipvlan_queue_xmit(skb, dev);
213 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
214 struct ipvl_pcpu_stats *pcptr;
216 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
218 u64_stats_update_begin(&pcptr->syncp);
220 pcptr->tx_bytes += skblen;
221 u64_stats_update_end(&pcptr->syncp);
223 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
228 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
229 netdev_features_t features)
231 struct ipvl_dev *ipvlan = netdev_priv(dev);
233 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
236 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
238 struct ipvl_dev *ipvlan = netdev_priv(dev);
239 struct net_device *phy_dev = ipvlan->phy_dev;
241 if (change & IFF_ALLMULTI)
242 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
245 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
247 struct ipvl_dev *ipvlan = netdev_priv(dev);
249 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
250 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
252 struct netdev_hw_addr *ha;
253 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
255 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
256 netdev_for_each_mc_addr(ha, dev)
257 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
259 /* Turn-on broadcast bit irrespective of address family,
260 * since broadcast is deferred to a work-queue, hence no
261 * impact on fast-path processing.
263 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
265 bitmap_copy(ipvlan->mac_filters, mc_filters,
266 IPVLAN_MAC_FILTER_SIZE);
268 dev_uc_sync(ipvlan->phy_dev, dev);
269 dev_mc_sync(ipvlan->phy_dev, dev);
272 static void ipvlan_get_stats64(struct net_device *dev,
273 struct rtnl_link_stats64 *s)
275 struct ipvl_dev *ipvlan = netdev_priv(dev);
277 if (ipvlan->pcpu_stats) {
278 struct ipvl_pcpu_stats *pcptr;
279 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
280 u32 rx_errs = 0, tx_drps = 0;
284 for_each_possible_cpu(idx) {
285 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
287 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
288 rx_pkts = pcptr->rx_pkts;
289 rx_bytes = pcptr->rx_bytes;
290 rx_mcast = pcptr->rx_mcast;
291 tx_pkts = pcptr->tx_pkts;
292 tx_bytes = pcptr->tx_bytes;
293 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
296 s->rx_packets += rx_pkts;
297 s->rx_bytes += rx_bytes;
298 s->multicast += rx_mcast;
299 s->tx_packets += tx_pkts;
300 s->tx_bytes += tx_bytes;
302 /* u32 values are updated without syncp protection. */
303 rx_errs += pcptr->rx_errs;
304 tx_drps += pcptr->tx_drps;
306 s->rx_errors = rx_errs;
307 s->rx_dropped = rx_errs;
308 s->tx_dropped = tx_drps;
312 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
314 struct ipvl_dev *ipvlan = netdev_priv(dev);
315 struct net_device *phy_dev = ipvlan->phy_dev;
317 return vlan_vid_add(phy_dev, proto, vid);
320 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
323 struct ipvl_dev *ipvlan = netdev_priv(dev);
324 struct net_device *phy_dev = ipvlan->phy_dev;
326 vlan_vid_del(phy_dev, proto, vid);
330 static int ipvlan_get_iflink(const struct net_device *dev)
332 struct ipvl_dev *ipvlan = netdev_priv(dev);
334 return ipvlan->phy_dev->ifindex;
337 static const struct net_device_ops ipvlan_netdev_ops = {
338 .ndo_init = ipvlan_init,
339 .ndo_uninit = ipvlan_uninit,
340 .ndo_open = ipvlan_open,
341 .ndo_stop = ipvlan_stop,
342 .ndo_start_xmit = ipvlan_start_xmit,
343 .ndo_fix_features = ipvlan_fix_features,
344 .ndo_change_rx_flags = ipvlan_change_rx_flags,
345 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
346 .ndo_get_stats64 = ipvlan_get_stats64,
347 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
348 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
349 .ndo_get_iflink = ipvlan_get_iflink,
352 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
353 unsigned short type, const void *daddr,
354 const void *saddr, unsigned len)
356 const struct ipvl_dev *ipvlan = netdev_priv(dev);
357 struct net_device *phy_dev = ipvlan->phy_dev;
359 /* TODO Probably use a different field than dev_addr so that the
360 * mac-address on the virtual device is portable and can be carried
361 * while the packets use the mac-addr on the physical device.
363 return dev_hard_header(skb, phy_dev, type, daddr,
364 saddr ? : phy_dev->dev_addr, len);
367 static const struct header_ops ipvlan_header_ops = {
368 .create = ipvlan_hard_header,
369 .parse = eth_header_parse,
370 .cache = eth_header_cache,
371 .cache_update = eth_header_cache_update,
374 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
376 ipvlan->dev->mtu = dev->mtu;
379 static bool netif_is_ipvlan(const struct net_device *dev)
381 /* both ipvlan and ipvtap devices use the same netdev_ops */
382 return dev->netdev_ops == &ipvlan_netdev_ops;
385 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
386 struct ethtool_link_ksettings *cmd)
388 const struct ipvl_dev *ipvlan = netdev_priv(dev);
390 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
393 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
394 struct ethtool_drvinfo *drvinfo)
396 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
397 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
400 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
402 const struct ipvl_dev *ipvlan = netdev_priv(dev);
404 return ipvlan->msg_enable;
407 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
409 struct ipvl_dev *ipvlan = netdev_priv(dev);
411 ipvlan->msg_enable = value;
414 static const struct ethtool_ops ipvlan_ethtool_ops = {
415 .get_link = ethtool_op_get_link,
416 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
417 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
418 .get_msglevel = ipvlan_ethtool_get_msglevel,
419 .set_msglevel = ipvlan_ethtool_set_msglevel,
422 static int ipvlan_nl_changelink(struct net_device *dev,
423 struct nlattr *tb[], struct nlattr *data[],
424 struct netlink_ext_ack *extack)
426 struct ipvl_dev *ipvlan = netdev_priv(dev);
427 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
432 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
435 if (data[IFLA_IPVLAN_MODE]) {
436 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
438 err = ipvlan_set_port_mode(port, nmode, extack);
441 if (!err && data[IFLA_IPVLAN_FLAGS]) {
442 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
444 if (flags & IPVLAN_F_PRIVATE)
445 ipvlan_mark_private(port);
447 ipvlan_clear_private(port);
449 if (flags & IPVLAN_F_VEPA)
450 ipvlan_mark_vepa(port);
452 ipvlan_clear_vepa(port);
458 static size_t ipvlan_nl_getsize(const struct net_device *dev)
461 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
462 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
466 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
467 struct netlink_ext_ack *extack)
472 if (data[IFLA_IPVLAN_MODE]) {
473 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
475 if (mode >= IPVLAN_MODE_MAX)
478 if (data[IFLA_IPVLAN_FLAGS]) {
479 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
481 /* Only two bits are used at this moment. */
482 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
484 /* Also both flags can't be active at the same time. */
485 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
486 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
493 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
494 const struct net_device *dev)
496 struct ipvl_dev *ipvlan = netdev_priv(dev);
497 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
504 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
506 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
515 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
516 struct nlattr *tb[], struct nlattr *data[],
517 struct netlink_ext_ack *extack)
519 struct ipvl_dev *ipvlan = netdev_priv(dev);
520 struct ipvl_port *port;
521 struct net_device *phy_dev;
523 u16 mode = IPVLAN_MODE_L3;
528 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
532 if (netif_is_ipvlan(phy_dev)) {
533 struct ipvl_dev *tmp = netdev_priv(phy_dev);
535 phy_dev = tmp->phy_dev;
536 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
538 } else if (!netif_is_ipvlan_port(phy_dev)) {
539 /* Exit early if the underlying link is invalid or busy */
540 if (phy_dev->type != ARPHRD_ETHER ||
541 phy_dev->flags & IFF_LOOPBACK) {
543 "Master is either lo or non-ether device\n");
547 if (netdev_is_rx_handler_busy(phy_dev)) {
548 netdev_err(phy_dev, "Device is already in use.\n");
553 ipvlan->phy_dev = phy_dev;
555 ipvlan->sfeatures = IPVLAN_FEATURES;
557 ipvlan_adjust_mtu(ipvlan, phy_dev);
558 INIT_LIST_HEAD(&ipvlan->addrs);
559 spin_lock_init(&ipvlan->addrs_lock);
561 /* TODO Probably put random address here to be presented to the
562 * world but keep using the physical-dev address for the outgoing
565 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
567 dev->priv_flags |= IFF_NO_RX_HANDLER;
569 err = register_netdevice(dev);
573 /* ipvlan_init() would have created the port, if required */
574 port = ipvlan_port_get_rtnl(phy_dev);
577 /* If the port-id base is at the MAX value, then wrap it around and
578 * begin from 0x1 again. This may be due to a busy system where lots
579 * of slaves are getting created and deleted.
581 if (port->dev_id_start == 0xFFFE)
582 port->dev_id_start = 0x1;
584 /* Since L2 address is shared among all IPvlan slaves including
585 * master, use unique 16 bit dev-ids to diffentiate among them.
586 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
587 * slave link [see addrconf_ifid_eui48()].
589 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
592 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
595 goto unregister_netdev;
598 /* Increment id-base to the next slot for the future assignment */
599 port->dev_id_start = err + 1;
601 err = netdev_upper_dev_link(phy_dev, dev, extack);
605 /* Flags are per port and latest update overrides. User has
606 * to be consistent in setting it just like the mode attribute.
608 if (data && data[IFLA_IPVLAN_FLAGS])
609 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
611 if (data && data[IFLA_IPVLAN_MODE])
612 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
614 err = ipvlan_set_port_mode(port, mode, extack);
618 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
619 netif_stacked_transfer_operstate(phy_dev, dev);
623 netdev_upper_dev_unlink(phy_dev, dev);
625 ida_simple_remove(&port->ida, dev->dev_id);
627 unregister_netdevice(dev);
630 EXPORT_SYMBOL_GPL(ipvlan_link_new);
632 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
634 struct ipvl_dev *ipvlan = netdev_priv(dev);
635 struct ipvl_addr *addr, *next;
637 spin_lock_bh(&ipvlan->addrs_lock);
638 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
639 ipvlan_ht_addr_del(addr);
640 list_del_rcu(&addr->anode);
641 kfree_rcu(addr, rcu);
643 spin_unlock_bh(&ipvlan->addrs_lock);
645 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
646 list_del_rcu(&ipvlan->pnode);
647 unregister_netdevice_queue(dev, head);
648 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
650 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
652 void ipvlan_link_setup(struct net_device *dev)
656 dev->max_mtu = ETH_MAX_MTU;
657 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
658 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
659 dev->netdev_ops = &ipvlan_netdev_ops;
660 dev->needs_free_netdev = true;
661 dev->header_ops = &ipvlan_header_ops;
662 dev->ethtool_ops = &ipvlan_ethtool_ops;
664 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
666 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
668 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
669 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
672 static struct rtnl_link_ops ipvlan_link_ops = {
674 .priv_size = sizeof(struct ipvl_dev),
676 .setup = ipvlan_link_setup,
677 .newlink = ipvlan_link_new,
678 .dellink = ipvlan_link_delete,
681 int ipvlan_link_register(struct rtnl_link_ops *ops)
683 ops->get_size = ipvlan_nl_getsize;
684 ops->policy = ipvlan_nl_policy;
685 ops->validate = ipvlan_nl_validate;
686 ops->fill_info = ipvlan_nl_fillinfo;
687 ops->changelink = ipvlan_nl_changelink;
688 ops->maxtype = IFLA_IPVLAN_MAX;
689 return rtnl_link_register(ops);
691 EXPORT_SYMBOL_GPL(ipvlan_link_register);
693 static int ipvlan_device_event(struct notifier_block *unused,
694 unsigned long event, void *ptr)
696 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
697 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
698 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
699 struct ipvl_dev *ipvlan, *next;
700 struct ipvl_port *port;
704 if (!netif_is_ipvlan_port(dev))
707 port = ipvlan_port_get_rtnl(dev);
711 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
712 netif_stacked_transfer_operstate(ipvlan->phy_dev,
716 case NETDEV_REGISTER: {
717 struct net *oldnet, *newnet = dev_net(dev);
719 oldnet = read_pnet(&port->pnet);
720 if (net_eq(newnet, oldnet))
723 write_pnet(&port->pnet, newnet);
725 ipvlan_migrate_l3s_hook(oldnet, newnet);
728 case NETDEV_UNREGISTER:
729 if (dev->reg_state != NETREG_UNREGISTERING)
732 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
733 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
735 unregister_netdevice_many(&lst_kill);
738 case NETDEV_FEAT_CHANGE:
739 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
740 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
741 ipvlan->dev->gso_max_size = dev->gso_max_size;
742 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
743 netdev_features_change(ipvlan->dev);
747 case NETDEV_CHANGEMTU:
748 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
749 ipvlan_adjust_mtu(ipvlan, dev);
752 case NETDEV_PRE_CHANGEADDR:
753 prechaddr_info = ptr;
754 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
755 err = dev_pre_changeaddr_notify(ipvlan->dev,
756 prechaddr_info->dev_addr,
759 return notifier_from_errno(err);
763 case NETDEV_CHANGEADDR:
764 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
765 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
766 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
770 case NETDEV_PRE_TYPE_CHANGE:
771 /* Forbid underlying device to change its type. */
777 /* the caller must held the addrs lock */
778 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
780 struct ipvl_addr *addr;
782 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
786 addr->master = ipvlan;
788 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
789 addr->atype = IPVL_IPV4;
790 #if IS_ENABLED(CONFIG_IPV6)
792 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
793 addr->atype = IPVL_IPV6;
797 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
799 /* If the interface is not up, the address will be added to the hash
800 * list by ipvlan_open.
802 if (netif_running(ipvlan->dev))
803 ipvlan_ht_addr_add(ipvlan, addr);
808 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
810 struct ipvl_addr *addr;
812 spin_lock_bh(&ipvlan->addrs_lock);
813 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
815 spin_unlock_bh(&ipvlan->addrs_lock);
819 ipvlan_ht_addr_del(addr);
820 list_del_rcu(&addr->anode);
821 spin_unlock_bh(&ipvlan->addrs_lock);
822 kfree_rcu(addr, rcu);
825 static bool ipvlan_is_valid_dev(const struct net_device *dev)
827 struct ipvl_dev *ipvlan = netdev_priv(dev);
829 if (!netif_is_ipvlan(dev))
832 if (!ipvlan || !ipvlan->port)
838 #if IS_ENABLED(CONFIG_IPV6)
839 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
843 spin_lock_bh(&ipvlan->addrs_lock);
844 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
845 netif_err(ipvlan, ifup, ipvlan->dev,
846 "Failed to add IPv6=%pI6c addr for %s intf\n",
847 ip6_addr, ipvlan->dev->name);
849 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
850 spin_unlock_bh(&ipvlan->addrs_lock);
854 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
856 return ipvlan_del_addr(ipvlan, ip6_addr, true);
859 static int ipvlan_addr6_event(struct notifier_block *unused,
860 unsigned long event, void *ptr)
862 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
863 struct net_device *dev = (struct net_device *)if6->idev->dev;
864 struct ipvl_dev *ipvlan = netdev_priv(dev);
866 if (!ipvlan_is_valid_dev(dev))
871 if (ipvlan_add_addr6(ipvlan, &if6->addr))
876 ipvlan_del_addr6(ipvlan, &if6->addr);
883 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
884 unsigned long event, void *ptr)
886 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
887 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
888 struct ipvl_dev *ipvlan = netdev_priv(dev);
890 if (!ipvlan_is_valid_dev(dev))
895 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
896 NL_SET_ERR_MSG(i6vi->extack,
897 "Address already assigned to an ipvlan device");
898 return notifier_from_errno(-EADDRINUSE);
907 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
911 spin_lock_bh(&ipvlan->addrs_lock);
912 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
913 netif_err(ipvlan, ifup, ipvlan->dev,
914 "Failed to add IPv4=%pI4 on %s intf.\n",
915 ip4_addr, ipvlan->dev->name);
917 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
918 spin_unlock_bh(&ipvlan->addrs_lock);
922 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
924 return ipvlan_del_addr(ipvlan, ip4_addr, false);
927 static int ipvlan_addr4_event(struct notifier_block *unused,
928 unsigned long event, void *ptr)
930 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
931 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
932 struct ipvl_dev *ipvlan = netdev_priv(dev);
933 struct in_addr ip4_addr;
935 if (!ipvlan_is_valid_dev(dev))
940 ip4_addr.s_addr = if4->ifa_address;
941 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
946 ip4_addr.s_addr = if4->ifa_address;
947 ipvlan_del_addr4(ipvlan, &ip4_addr);
954 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
955 unsigned long event, void *ptr)
957 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
958 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
959 struct ipvl_dev *ipvlan = netdev_priv(dev);
961 if (!ipvlan_is_valid_dev(dev))
966 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
967 NL_SET_ERR_MSG(ivi->extack,
968 "Address already assigned to an ipvlan device");
969 return notifier_from_errno(-EADDRINUSE);
977 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
978 .notifier_call = ipvlan_addr4_event,
981 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
982 .notifier_call = ipvlan_addr4_validator_event,
985 static struct notifier_block ipvlan_notifier_block __read_mostly = {
986 .notifier_call = ipvlan_device_event,
989 #if IS_ENABLED(CONFIG_IPV6)
990 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
991 .notifier_call = ipvlan_addr6_event,
994 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
995 .notifier_call = ipvlan_addr6_validator_event,
999 static int __init ipvlan_init_module(void)
1003 ipvlan_init_secret();
1004 register_netdevice_notifier(&ipvlan_notifier_block);
1005 #if IS_ENABLED(CONFIG_IPV6)
1006 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1007 register_inet6addr_validator_notifier(
1008 &ipvlan_addr6_vtor_notifier_block);
1010 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1011 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1013 err = ipvlan_l3s_init();
1017 err = ipvlan_link_register(&ipvlan_link_ops);
1019 ipvlan_l3s_cleanup();
1025 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1026 unregister_inetaddr_validator_notifier(
1027 &ipvlan_addr4_vtor_notifier_block);
1028 #if IS_ENABLED(CONFIG_IPV6)
1029 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1030 unregister_inet6addr_validator_notifier(
1031 &ipvlan_addr6_vtor_notifier_block);
1033 unregister_netdevice_notifier(&ipvlan_notifier_block);
1037 static void __exit ipvlan_cleanup_module(void)
1039 rtnl_link_unregister(&ipvlan_link_ops);
1040 ipvlan_l3s_cleanup();
1041 unregister_netdevice_notifier(&ipvlan_notifier_block);
1042 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1043 unregister_inetaddr_validator_notifier(
1044 &ipvlan_addr4_vtor_notifier_block);
1045 #if IS_ENABLED(CONFIG_IPV6)
1046 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1047 unregister_inet6addr_validator_notifier(
1048 &ipvlan_addr6_vtor_notifier_block);
1052 module_init(ipvlan_init_module);
1053 module_exit(ipvlan_cleanup_module);
1055 MODULE_LICENSE("GPL");
1056 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1057 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1058 MODULE_ALIAS_RTNL_LINK("ipvlan");