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_ALL_TSO | NETIF_F_GSO_ROBUST | \
112 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 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
135 if (!ipvlan->pcpu_stats)
138 if (!netif_is_ipvlan_port(phy_dev)) {
139 err = ipvlan_port_create(phy_dev);
141 free_percpu(ipvlan->pcpu_stats);
145 port = ipvlan_port_get_rtnl(phy_dev);
150 static void ipvlan_uninit(struct net_device *dev)
152 struct ipvl_dev *ipvlan = netdev_priv(dev);
153 struct net_device *phy_dev = ipvlan->phy_dev;
154 struct ipvl_port *port;
156 free_percpu(ipvlan->pcpu_stats);
158 port = ipvlan_port_get_rtnl(phy_dev);
161 ipvlan_port_destroy(port->dev);
164 static int ipvlan_open(struct net_device *dev)
166 struct ipvl_dev *ipvlan = netdev_priv(dev);
167 struct net_device *phy_dev = ipvlan->phy_dev;
168 struct ipvl_addr *addr;
170 if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
171 ipvlan->port->mode == IPVLAN_MODE_L3S)
172 dev->flags |= IFF_NOARP;
174 dev->flags &= ~IFF_NOARP;
177 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
178 ipvlan_ht_addr_add(ipvlan, addr);
181 return dev_uc_add(phy_dev, phy_dev->dev_addr);
184 static int ipvlan_stop(struct net_device *dev)
186 struct ipvl_dev *ipvlan = netdev_priv(dev);
187 struct net_device *phy_dev = ipvlan->phy_dev;
188 struct ipvl_addr *addr;
190 dev_uc_unsync(phy_dev, dev);
191 dev_mc_unsync(phy_dev, dev);
193 dev_uc_del(phy_dev, phy_dev->dev_addr);
196 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
197 ipvlan_ht_addr_del(addr);
203 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
204 struct net_device *dev)
206 const struct ipvl_dev *ipvlan = netdev_priv(dev);
207 int skblen = skb->len;
210 ret = ipvlan_queue_xmit(skb, dev);
211 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
212 struct ipvl_pcpu_stats *pcptr;
214 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
216 u64_stats_update_begin(&pcptr->syncp);
218 pcptr->tx_bytes += skblen;
219 u64_stats_update_end(&pcptr->syncp);
221 this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
226 static netdev_features_t ipvlan_fix_features(struct net_device *dev,
227 netdev_features_t features)
229 struct ipvl_dev *ipvlan = netdev_priv(dev);
231 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES);
234 static void ipvlan_change_rx_flags(struct net_device *dev, int change)
236 struct ipvl_dev *ipvlan = netdev_priv(dev);
237 struct net_device *phy_dev = ipvlan->phy_dev;
239 if (change & IFF_ALLMULTI)
240 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
243 static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
245 struct ipvl_dev *ipvlan = netdev_priv(dev);
247 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
248 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
250 struct netdev_hw_addr *ha;
251 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
253 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
254 netdev_for_each_mc_addr(ha, dev)
255 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
257 /* Turn-on broadcast bit irrespective of address family,
258 * since broadcast is deferred to a work-queue, hence no
259 * impact on fast-path processing.
261 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
263 bitmap_copy(ipvlan->mac_filters, mc_filters,
264 IPVLAN_MAC_FILTER_SIZE);
266 dev_uc_sync(ipvlan->phy_dev, dev);
267 dev_mc_sync(ipvlan->phy_dev, dev);
270 static void ipvlan_get_stats64(struct net_device *dev,
271 struct rtnl_link_stats64 *s)
273 struct ipvl_dev *ipvlan = netdev_priv(dev);
275 if (ipvlan->pcpu_stats) {
276 struct ipvl_pcpu_stats *pcptr;
277 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
278 u32 rx_errs = 0, tx_drps = 0;
282 for_each_possible_cpu(idx) {
283 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
285 strt= u64_stats_fetch_begin_irq(&pcptr->syncp);
286 rx_pkts = pcptr->rx_pkts;
287 rx_bytes = pcptr->rx_bytes;
288 rx_mcast = pcptr->rx_mcast;
289 tx_pkts = pcptr->tx_pkts;
290 tx_bytes = pcptr->tx_bytes;
291 } while (u64_stats_fetch_retry_irq(&pcptr->syncp,
294 s->rx_packets += rx_pkts;
295 s->rx_bytes += rx_bytes;
296 s->multicast += rx_mcast;
297 s->tx_packets += tx_pkts;
298 s->tx_bytes += tx_bytes;
300 /* u32 values are updated without syncp protection. */
301 rx_errs += pcptr->rx_errs;
302 tx_drps += pcptr->tx_drps;
304 s->rx_errors = rx_errs;
305 s->rx_dropped = rx_errs;
306 s->tx_dropped = tx_drps;
310 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
312 struct ipvl_dev *ipvlan = netdev_priv(dev);
313 struct net_device *phy_dev = ipvlan->phy_dev;
315 return vlan_vid_add(phy_dev, proto, vid);
318 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
321 struct ipvl_dev *ipvlan = netdev_priv(dev);
322 struct net_device *phy_dev = ipvlan->phy_dev;
324 vlan_vid_del(phy_dev, proto, vid);
328 static int ipvlan_get_iflink(const struct net_device *dev)
330 struct ipvl_dev *ipvlan = netdev_priv(dev);
332 return ipvlan->phy_dev->ifindex;
335 static const struct net_device_ops ipvlan_netdev_ops = {
336 .ndo_init = ipvlan_init,
337 .ndo_uninit = ipvlan_uninit,
338 .ndo_open = ipvlan_open,
339 .ndo_stop = ipvlan_stop,
340 .ndo_start_xmit = ipvlan_start_xmit,
341 .ndo_fix_features = ipvlan_fix_features,
342 .ndo_change_rx_flags = ipvlan_change_rx_flags,
343 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
344 .ndo_get_stats64 = ipvlan_get_stats64,
345 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
346 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
347 .ndo_get_iflink = ipvlan_get_iflink,
350 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
351 unsigned short type, const void *daddr,
352 const void *saddr, unsigned len)
354 const struct ipvl_dev *ipvlan = netdev_priv(dev);
355 struct net_device *phy_dev = ipvlan->phy_dev;
357 /* TODO Probably use a different field than dev_addr so that the
358 * mac-address on the virtual device is portable and can be carried
359 * while the packets use the mac-addr on the physical device.
361 return dev_hard_header(skb, phy_dev, type, daddr,
362 saddr ? : phy_dev->dev_addr, len);
365 static const struct header_ops ipvlan_header_ops = {
366 .create = ipvlan_hard_header,
367 .parse = eth_header_parse,
368 .cache = eth_header_cache,
369 .cache_update = eth_header_cache_update,
372 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
374 ipvlan->dev->mtu = dev->mtu;
377 static bool netif_is_ipvlan(const struct net_device *dev)
379 /* both ipvlan and ipvtap devices use the same netdev_ops */
380 return dev->netdev_ops == &ipvlan_netdev_ops;
383 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
384 struct ethtool_link_ksettings *cmd)
386 const struct ipvl_dev *ipvlan = netdev_priv(dev);
388 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
391 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
392 struct ethtool_drvinfo *drvinfo)
394 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
395 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
398 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
400 const struct ipvl_dev *ipvlan = netdev_priv(dev);
402 return ipvlan->msg_enable;
405 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
407 struct ipvl_dev *ipvlan = netdev_priv(dev);
409 ipvlan->msg_enable = value;
412 static const struct ethtool_ops ipvlan_ethtool_ops = {
413 .get_link = ethtool_op_get_link,
414 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings,
415 .get_drvinfo = ipvlan_ethtool_get_drvinfo,
416 .get_msglevel = ipvlan_ethtool_get_msglevel,
417 .set_msglevel = ipvlan_ethtool_set_msglevel,
420 static int ipvlan_nl_changelink(struct net_device *dev,
421 struct nlattr *tb[], struct nlattr *data[],
422 struct netlink_ext_ack *extack)
424 struct ipvl_dev *ipvlan = netdev_priv(dev);
425 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
430 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
433 if (data[IFLA_IPVLAN_MODE]) {
434 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
436 err = ipvlan_set_port_mode(port, nmode, extack);
439 if (!err && data[IFLA_IPVLAN_FLAGS]) {
440 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
442 if (flags & IPVLAN_F_PRIVATE)
443 ipvlan_mark_private(port);
445 ipvlan_clear_private(port);
447 if (flags & IPVLAN_F_VEPA)
448 ipvlan_mark_vepa(port);
450 ipvlan_clear_vepa(port);
456 static size_t ipvlan_nl_getsize(const struct net_device *dev)
459 + nla_total_size(2) /* IFLA_IPVLAN_MODE */
460 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
464 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
465 struct netlink_ext_ack *extack)
470 if (data[IFLA_IPVLAN_MODE]) {
471 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
473 if (mode >= IPVLAN_MODE_MAX)
476 if (data[IFLA_IPVLAN_FLAGS]) {
477 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
479 /* Only two bits are used at this moment. */
480 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
482 /* Also both flags can't be active at the same time. */
483 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
484 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
491 static int ipvlan_nl_fillinfo(struct sk_buff *skb,
492 const struct net_device *dev)
494 struct ipvl_dev *ipvlan = netdev_priv(dev);
495 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
502 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
504 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
513 int ipvlan_link_new(struct net *src_net, struct net_device *dev,
514 struct nlattr *tb[], struct nlattr *data[],
515 struct netlink_ext_ack *extack)
517 struct ipvl_dev *ipvlan = netdev_priv(dev);
518 struct ipvl_port *port;
519 struct net_device *phy_dev;
521 u16 mode = IPVLAN_MODE_L3;
526 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
530 if (netif_is_ipvlan(phy_dev)) {
531 struct ipvl_dev *tmp = netdev_priv(phy_dev);
533 phy_dev = tmp->phy_dev;
534 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
536 } else if (!netif_is_ipvlan_port(phy_dev)) {
537 /* Exit early if the underlying link is invalid or busy */
538 if (phy_dev->type != ARPHRD_ETHER ||
539 phy_dev->flags & IFF_LOOPBACK) {
541 "Master is either lo or non-ether device\n");
545 if (netdev_is_rx_handler_busy(phy_dev)) {
546 netdev_err(phy_dev, "Device is already in use.\n");
551 ipvlan->phy_dev = phy_dev;
553 ipvlan->sfeatures = IPVLAN_FEATURES;
555 ipvlan_adjust_mtu(ipvlan, phy_dev);
556 INIT_LIST_HEAD(&ipvlan->addrs);
557 spin_lock_init(&ipvlan->addrs_lock);
559 /* TODO Probably put random address here to be presented to the
560 * world but keep using the physical-dev address for the outgoing
563 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
565 dev->priv_flags |= IFF_NO_RX_HANDLER;
567 err = register_netdevice(dev);
571 /* ipvlan_init() would have created the port, if required */
572 port = ipvlan_port_get_rtnl(phy_dev);
575 /* If the port-id base is at the MAX value, then wrap it around and
576 * begin from 0x1 again. This may be due to a busy system where lots
577 * of slaves are getting created and deleted.
579 if (port->dev_id_start == 0xFFFE)
580 port->dev_id_start = 0x1;
582 /* Since L2 address is shared among all IPvlan slaves including
583 * master, use unique 16 bit dev-ids to diffentiate among them.
584 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
585 * slave link [see addrconf_ifid_eui48()].
587 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
590 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
593 goto unregister_netdev;
596 /* Increment id-base to the next slot for the future assignment */
597 port->dev_id_start = err + 1;
599 err = netdev_upper_dev_link(phy_dev, dev, extack);
603 /* Flags are per port and latest update overrides. User has
604 * to be consistent in setting it just like the mode attribute.
606 if (data && data[IFLA_IPVLAN_FLAGS])
607 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
609 if (data && data[IFLA_IPVLAN_MODE])
610 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
612 err = ipvlan_set_port_mode(port, mode, extack);
616 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
617 netif_stacked_transfer_operstate(phy_dev, dev);
621 netdev_upper_dev_unlink(phy_dev, dev);
623 ida_simple_remove(&port->ida, dev->dev_id);
625 unregister_netdevice(dev);
628 EXPORT_SYMBOL_GPL(ipvlan_link_new);
630 void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
632 struct ipvl_dev *ipvlan = netdev_priv(dev);
633 struct ipvl_addr *addr, *next;
635 spin_lock_bh(&ipvlan->addrs_lock);
636 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
637 ipvlan_ht_addr_del(addr);
638 list_del_rcu(&addr->anode);
639 kfree_rcu(addr, rcu);
641 spin_unlock_bh(&ipvlan->addrs_lock);
643 ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
644 list_del_rcu(&ipvlan->pnode);
645 unregister_netdevice_queue(dev, head);
646 netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
648 EXPORT_SYMBOL_GPL(ipvlan_link_delete);
650 void ipvlan_link_setup(struct net_device *dev)
654 dev->max_mtu = ETH_MAX_MTU;
655 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
656 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
657 dev->netdev_ops = &ipvlan_netdev_ops;
658 dev->needs_free_netdev = true;
659 dev->header_ops = &ipvlan_header_ops;
660 dev->ethtool_ops = &ipvlan_ethtool_ops;
662 EXPORT_SYMBOL_GPL(ipvlan_link_setup);
664 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
666 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
667 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
670 static struct rtnl_link_ops ipvlan_link_ops = {
672 .priv_size = sizeof(struct ipvl_dev),
674 .setup = ipvlan_link_setup,
675 .newlink = ipvlan_link_new,
676 .dellink = ipvlan_link_delete,
679 int ipvlan_link_register(struct rtnl_link_ops *ops)
681 ops->get_size = ipvlan_nl_getsize;
682 ops->policy = ipvlan_nl_policy;
683 ops->validate = ipvlan_nl_validate;
684 ops->fill_info = ipvlan_nl_fillinfo;
685 ops->changelink = ipvlan_nl_changelink;
686 ops->maxtype = IFLA_IPVLAN_MAX;
687 return rtnl_link_register(ops);
689 EXPORT_SYMBOL_GPL(ipvlan_link_register);
691 static int ipvlan_device_event(struct notifier_block *unused,
692 unsigned long event, void *ptr)
694 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
695 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
696 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
697 struct ipvl_dev *ipvlan, *next;
698 struct ipvl_port *port;
702 if (!netif_is_ipvlan_port(dev))
705 port = ipvlan_port_get_rtnl(dev);
709 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
710 netif_stacked_transfer_operstate(ipvlan->phy_dev,
714 case NETDEV_REGISTER: {
715 struct net *oldnet, *newnet = dev_net(dev);
717 oldnet = read_pnet(&port->pnet);
718 if (net_eq(newnet, oldnet))
721 write_pnet(&port->pnet, newnet);
723 ipvlan_migrate_l3s_hook(oldnet, newnet);
726 case NETDEV_UNREGISTER:
727 if (dev->reg_state != NETREG_UNREGISTERING)
730 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
731 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
733 unregister_netdevice_many(&lst_kill);
736 case NETDEV_FEAT_CHANGE:
737 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
738 ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
739 ipvlan->dev->gso_max_size = dev->gso_max_size;
740 ipvlan->dev->gso_max_segs = dev->gso_max_segs;
741 netdev_features_change(ipvlan->dev);
745 case NETDEV_CHANGEMTU:
746 list_for_each_entry(ipvlan, &port->ipvlans, pnode)
747 ipvlan_adjust_mtu(ipvlan, dev);
750 case NETDEV_PRE_CHANGEADDR:
751 prechaddr_info = ptr;
752 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
753 err = dev_pre_changeaddr_notify(ipvlan->dev,
754 prechaddr_info->dev_addr,
757 return notifier_from_errno(err);
761 case NETDEV_CHANGEADDR:
762 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
763 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr);
764 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
768 case NETDEV_PRE_TYPE_CHANGE:
769 /* Forbid underlying device to change its type. */
775 /* the caller must held the addrs lock */
776 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
778 struct ipvl_addr *addr;
780 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
784 addr->master = ipvlan;
786 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
787 addr->atype = IPVL_IPV4;
788 #if IS_ENABLED(CONFIG_IPV6)
790 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
791 addr->atype = IPVL_IPV6;
795 list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
797 /* If the interface is not up, the address will be added to the hash
798 * list by ipvlan_open.
800 if (netif_running(ipvlan->dev))
801 ipvlan_ht_addr_add(ipvlan, addr);
806 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
808 struct ipvl_addr *addr;
810 spin_lock_bh(&ipvlan->addrs_lock);
811 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
813 spin_unlock_bh(&ipvlan->addrs_lock);
817 ipvlan_ht_addr_del(addr);
818 list_del_rcu(&addr->anode);
819 spin_unlock_bh(&ipvlan->addrs_lock);
820 kfree_rcu(addr, rcu);
823 static bool ipvlan_is_valid_dev(const struct net_device *dev)
825 struct ipvl_dev *ipvlan = netdev_priv(dev);
827 if (!netif_is_ipvlan(dev))
830 if (!ipvlan || !ipvlan->port)
836 #if IS_ENABLED(CONFIG_IPV6)
837 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
841 spin_lock_bh(&ipvlan->addrs_lock);
842 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
843 netif_err(ipvlan, ifup, ipvlan->dev,
844 "Failed to add IPv6=%pI6c addr for %s intf\n",
845 ip6_addr, ipvlan->dev->name);
847 ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
848 spin_unlock_bh(&ipvlan->addrs_lock);
852 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
854 return ipvlan_del_addr(ipvlan, ip6_addr, true);
857 static int ipvlan_addr6_event(struct notifier_block *unused,
858 unsigned long event, void *ptr)
860 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
861 struct net_device *dev = (struct net_device *)if6->idev->dev;
862 struct ipvl_dev *ipvlan = netdev_priv(dev);
864 if (!ipvlan_is_valid_dev(dev))
869 if (ipvlan_add_addr6(ipvlan, &if6->addr))
874 ipvlan_del_addr6(ipvlan, &if6->addr);
881 static int ipvlan_addr6_validator_event(struct notifier_block *unused,
882 unsigned long event, void *ptr)
884 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
885 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
886 struct ipvl_dev *ipvlan = netdev_priv(dev);
888 if (!ipvlan_is_valid_dev(dev))
893 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
894 NL_SET_ERR_MSG(i6vi->extack,
895 "Address already assigned to an ipvlan device");
896 return notifier_from_errno(-EADDRINUSE);
905 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
909 spin_lock_bh(&ipvlan->addrs_lock);
910 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
911 netif_err(ipvlan, ifup, ipvlan->dev,
912 "Failed to add IPv4=%pI4 on %s intf.\n",
913 ip4_addr, ipvlan->dev->name);
915 ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
916 spin_unlock_bh(&ipvlan->addrs_lock);
920 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
922 return ipvlan_del_addr(ipvlan, ip4_addr, false);
925 static int ipvlan_addr4_event(struct notifier_block *unused,
926 unsigned long event, void *ptr)
928 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
929 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
930 struct ipvl_dev *ipvlan = netdev_priv(dev);
931 struct in_addr ip4_addr;
933 if (!ipvlan_is_valid_dev(dev))
938 ip4_addr.s_addr = if4->ifa_address;
939 if (ipvlan_add_addr4(ipvlan, &ip4_addr))
944 ip4_addr.s_addr = if4->ifa_address;
945 ipvlan_del_addr4(ipvlan, &ip4_addr);
952 static int ipvlan_addr4_validator_event(struct notifier_block *unused,
953 unsigned long event, void *ptr)
955 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
956 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
957 struct ipvl_dev *ipvlan = netdev_priv(dev);
959 if (!ipvlan_is_valid_dev(dev))
964 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
965 NL_SET_ERR_MSG(ivi->extack,
966 "Address already assigned to an ipvlan device");
967 return notifier_from_errno(-EADDRINUSE);
975 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
976 .notifier_call = ipvlan_addr4_event,
979 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
980 .notifier_call = ipvlan_addr4_validator_event,
983 static struct notifier_block ipvlan_notifier_block __read_mostly = {
984 .notifier_call = ipvlan_device_event,
987 #if IS_ENABLED(CONFIG_IPV6)
988 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
989 .notifier_call = ipvlan_addr6_event,
992 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
993 .notifier_call = ipvlan_addr6_validator_event,
997 static int __init ipvlan_init_module(void)
1001 ipvlan_init_secret();
1002 register_netdevice_notifier(&ipvlan_notifier_block);
1003 #if IS_ENABLED(CONFIG_IPV6)
1004 register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1005 register_inet6addr_validator_notifier(
1006 &ipvlan_addr6_vtor_notifier_block);
1008 register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1009 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
1011 err = ipvlan_l3s_init();
1015 err = ipvlan_link_register(&ipvlan_link_ops);
1017 ipvlan_l3s_cleanup();
1023 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1024 unregister_inetaddr_validator_notifier(
1025 &ipvlan_addr4_vtor_notifier_block);
1026 #if IS_ENABLED(CONFIG_IPV6)
1027 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1028 unregister_inet6addr_validator_notifier(
1029 &ipvlan_addr6_vtor_notifier_block);
1031 unregister_netdevice_notifier(&ipvlan_notifier_block);
1035 static void __exit ipvlan_cleanup_module(void)
1037 rtnl_link_unregister(&ipvlan_link_ops);
1038 ipvlan_l3s_cleanup();
1039 unregister_netdevice_notifier(&ipvlan_notifier_block);
1040 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
1041 unregister_inetaddr_validator_notifier(
1042 &ipvlan_addr4_vtor_notifier_block);
1043 #if IS_ENABLED(CONFIG_IPV6)
1044 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
1045 unregister_inet6addr_validator_notifier(
1046 &ipvlan_addr6_vtor_notifier_block);
1050 module_init(ipvlan_init_module);
1051 module_exit(ipvlan_cleanup_module);
1053 MODULE_LICENSE("GPL");
1054 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
1055 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
1056 MODULE_ALIAS_RTNL_LINK("ipvlan");