1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com> 2 * 3 * This program is free software; you can redistribute it and/or 4 * modify it under the terms of the GNU General Public License as 5 * published by the Free Software Foundation; either version 2 of 6 * the License, or (at your option) any later version. 7 * 8 */ 9 10 #include "ipvlan.h" 11 12 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 13 { 14 ipvlan->dev->mtu = dev->mtu - ipvlan->mtu_adj; 15 } 16 17 static void ipvlan_set_port_mode(struct ipvl_port *port, u16 nval) 18 { 19 struct ipvl_dev *ipvlan; 20 21 if (port->mode != nval) { 22 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 23 if (nval == IPVLAN_MODE_L3) 24 ipvlan->dev->flags |= IFF_NOARP; 25 else 26 ipvlan->dev->flags &= ~IFF_NOARP; 27 } 28 port->mode = nval; 29 } 30 } 31 32 static int ipvlan_port_create(struct net_device *dev) 33 { 34 struct ipvl_port *port; 35 int err, idx; 36 37 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) { 38 netdev_err(dev, "Master is either lo or non-ether device\n"); 39 return -EINVAL; 40 } 41 42 if (netif_is_macvlan_port(dev)) { 43 netdev_err(dev, "Master is a macvlan port.\n"); 44 return -EBUSY; 45 } 46 47 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL); 48 if (!port) 49 return -ENOMEM; 50 51 port->dev = dev; 52 port->mode = IPVLAN_MODE_L3; 53 INIT_LIST_HEAD(&port->ipvlans); 54 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++) 55 INIT_HLIST_HEAD(&port->hlhead[idx]); 56 57 skb_queue_head_init(&port->backlog); 58 INIT_WORK(&port->wq, ipvlan_process_multicast); 59 60 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 61 if (err) 62 goto err; 63 64 dev->priv_flags |= IFF_IPVLAN_MASTER; 65 return 0; 66 67 err: 68 kfree_rcu(port, rcu); 69 return err; 70 } 71 72 static void ipvlan_port_destroy(struct net_device *dev) 73 { 74 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 75 76 dev->priv_flags &= ~IFF_IPVLAN_MASTER; 77 netdev_rx_handler_unregister(dev); 78 cancel_work_sync(&port->wq); 79 __skb_queue_purge(&port->backlog); 80 kfree_rcu(port, rcu); 81 } 82 83 #define IPVLAN_FEATURES \ 84 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 85 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 86 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 87 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 88 89 #define IPVLAN_STATE_MASK \ 90 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 91 92 static int ipvlan_init(struct net_device *dev) 93 { 94 struct ipvl_dev *ipvlan = netdev_priv(dev); 95 const struct net_device *phy_dev = ipvlan->phy_dev; 96 struct ipvl_port *port = ipvlan->port; 97 98 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 99 (phy_dev->state & IPVLAN_STATE_MASK); 100 dev->features = phy_dev->features & IPVLAN_FEATURES; 101 dev->features |= NETIF_F_LLTX; 102 dev->gso_max_size = phy_dev->gso_max_size; 103 dev->gso_max_segs = phy_dev->gso_max_segs; 104 dev->hard_header_len = phy_dev->hard_header_len; 105 106 netdev_lockdep_set_classes(dev); 107 108 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats); 109 if (!ipvlan->pcpu_stats) 110 return -ENOMEM; 111 112 port->count += 1; 113 114 return 0; 115 } 116 117 static void ipvlan_uninit(struct net_device *dev) 118 { 119 struct ipvl_dev *ipvlan = netdev_priv(dev); 120 struct ipvl_port *port = ipvlan->port; 121 122 free_percpu(ipvlan->pcpu_stats); 123 124 port->count -= 1; 125 if (!port->count) 126 ipvlan_port_destroy(port->dev); 127 } 128 129 static int ipvlan_open(struct net_device *dev) 130 { 131 struct ipvl_dev *ipvlan = netdev_priv(dev); 132 struct net_device *phy_dev = ipvlan->phy_dev; 133 struct ipvl_addr *addr; 134 135 if (ipvlan->port->mode == IPVLAN_MODE_L3) 136 dev->flags |= IFF_NOARP; 137 else 138 dev->flags &= ~IFF_NOARP; 139 140 list_for_each_entry(addr, &ipvlan->addrs, anode) 141 ipvlan_ht_addr_add(ipvlan, addr); 142 143 return dev_uc_add(phy_dev, phy_dev->dev_addr); 144 } 145 146 static int ipvlan_stop(struct net_device *dev) 147 { 148 struct ipvl_dev *ipvlan = netdev_priv(dev); 149 struct net_device *phy_dev = ipvlan->phy_dev; 150 struct ipvl_addr *addr; 151 152 dev_uc_unsync(phy_dev, dev); 153 dev_mc_unsync(phy_dev, dev); 154 155 dev_uc_del(phy_dev, phy_dev->dev_addr); 156 157 list_for_each_entry(addr, &ipvlan->addrs, anode) 158 ipvlan_ht_addr_del(addr); 159 160 return 0; 161 } 162 163 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 164 struct net_device *dev) 165 { 166 const struct ipvl_dev *ipvlan = netdev_priv(dev); 167 int skblen = skb->len; 168 int ret; 169 170 ret = ipvlan_queue_xmit(skb, dev); 171 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 172 struct ipvl_pcpu_stats *pcptr; 173 174 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 175 176 u64_stats_update_begin(&pcptr->syncp); 177 pcptr->tx_pkts++; 178 pcptr->tx_bytes += skblen; 179 u64_stats_update_end(&pcptr->syncp); 180 } else { 181 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 182 } 183 return ret; 184 } 185 186 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 187 netdev_features_t features) 188 { 189 struct ipvl_dev *ipvlan = netdev_priv(dev); 190 191 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 192 } 193 194 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 195 { 196 struct ipvl_dev *ipvlan = netdev_priv(dev); 197 struct net_device *phy_dev = ipvlan->phy_dev; 198 199 if (change & IFF_ALLMULTI) 200 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 201 } 202 203 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 204 { 205 struct ipvl_dev *ipvlan = netdev_priv(dev); 206 207 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 208 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 209 } else { 210 struct netdev_hw_addr *ha; 211 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 212 213 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 214 netdev_for_each_mc_addr(ha, dev) 215 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 216 217 /* Turn-on broadcast bit irrespective of address family, 218 * since broadcast is deferred to a work-queue, hence no 219 * impact on fast-path processing. 220 */ 221 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 222 223 bitmap_copy(ipvlan->mac_filters, mc_filters, 224 IPVLAN_MAC_FILTER_SIZE); 225 } 226 dev_uc_sync(ipvlan->phy_dev, dev); 227 dev_mc_sync(ipvlan->phy_dev, dev); 228 } 229 230 static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev, 231 struct rtnl_link_stats64 *s) 232 { 233 struct ipvl_dev *ipvlan = netdev_priv(dev); 234 235 if (ipvlan->pcpu_stats) { 236 struct ipvl_pcpu_stats *pcptr; 237 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 238 u32 rx_errs = 0, tx_drps = 0; 239 u32 strt; 240 int idx; 241 242 for_each_possible_cpu(idx) { 243 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 244 do { 245 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 246 rx_pkts = pcptr->rx_pkts; 247 rx_bytes = pcptr->rx_bytes; 248 rx_mcast = pcptr->rx_mcast; 249 tx_pkts = pcptr->tx_pkts; 250 tx_bytes = pcptr->tx_bytes; 251 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 252 strt)); 253 254 s->rx_packets += rx_pkts; 255 s->rx_bytes += rx_bytes; 256 s->multicast += rx_mcast; 257 s->tx_packets += tx_pkts; 258 s->tx_bytes += tx_bytes; 259 260 /* u32 values are updated without syncp protection. */ 261 rx_errs += pcptr->rx_errs; 262 tx_drps += pcptr->tx_drps; 263 } 264 s->rx_errors = rx_errs; 265 s->rx_dropped = rx_errs; 266 s->tx_dropped = tx_drps; 267 } 268 return s; 269 } 270 271 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 272 { 273 struct ipvl_dev *ipvlan = netdev_priv(dev); 274 struct net_device *phy_dev = ipvlan->phy_dev; 275 276 return vlan_vid_add(phy_dev, proto, vid); 277 } 278 279 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 280 u16 vid) 281 { 282 struct ipvl_dev *ipvlan = netdev_priv(dev); 283 struct net_device *phy_dev = ipvlan->phy_dev; 284 285 vlan_vid_del(phy_dev, proto, vid); 286 return 0; 287 } 288 289 static int ipvlan_get_iflink(const struct net_device *dev) 290 { 291 struct ipvl_dev *ipvlan = netdev_priv(dev); 292 293 return ipvlan->phy_dev->ifindex; 294 } 295 296 static const struct net_device_ops ipvlan_netdev_ops = { 297 .ndo_init = ipvlan_init, 298 .ndo_uninit = ipvlan_uninit, 299 .ndo_open = ipvlan_open, 300 .ndo_stop = ipvlan_stop, 301 .ndo_start_xmit = ipvlan_start_xmit, 302 .ndo_fix_features = ipvlan_fix_features, 303 .ndo_change_rx_flags = ipvlan_change_rx_flags, 304 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 305 .ndo_get_stats64 = ipvlan_get_stats64, 306 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 307 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 308 .ndo_get_iflink = ipvlan_get_iflink, 309 }; 310 311 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 312 unsigned short type, const void *daddr, 313 const void *saddr, unsigned len) 314 { 315 const struct ipvl_dev *ipvlan = netdev_priv(dev); 316 struct net_device *phy_dev = ipvlan->phy_dev; 317 318 /* TODO Probably use a different field than dev_addr so that the 319 * mac-address on the virtual device is portable and can be carried 320 * while the packets use the mac-addr on the physical device. 321 */ 322 return dev_hard_header(skb, phy_dev, type, daddr, 323 saddr ? : dev->dev_addr, len); 324 } 325 326 static const struct header_ops ipvlan_header_ops = { 327 .create = ipvlan_hard_header, 328 .parse = eth_header_parse, 329 .cache = eth_header_cache, 330 .cache_update = eth_header_cache_update, 331 }; 332 333 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 334 struct ethtool_link_ksettings *cmd) 335 { 336 const struct ipvl_dev *ipvlan = netdev_priv(dev); 337 338 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 339 } 340 341 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 342 struct ethtool_drvinfo *drvinfo) 343 { 344 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 345 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 346 } 347 348 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 349 { 350 const struct ipvl_dev *ipvlan = netdev_priv(dev); 351 352 return ipvlan->msg_enable; 353 } 354 355 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 356 { 357 struct ipvl_dev *ipvlan = netdev_priv(dev); 358 359 ipvlan->msg_enable = value; 360 } 361 362 static const struct ethtool_ops ipvlan_ethtool_ops = { 363 .get_link = ethtool_op_get_link, 364 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 365 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 366 .get_msglevel = ipvlan_ethtool_get_msglevel, 367 .set_msglevel = ipvlan_ethtool_set_msglevel, 368 }; 369 370 static int ipvlan_nl_changelink(struct net_device *dev, 371 struct nlattr *tb[], struct nlattr *data[]) 372 { 373 struct ipvl_dev *ipvlan = netdev_priv(dev); 374 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 375 376 if (data && data[IFLA_IPVLAN_MODE]) { 377 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 378 379 ipvlan_set_port_mode(port, nmode); 380 } 381 return 0; 382 } 383 384 static size_t ipvlan_nl_getsize(const struct net_device *dev) 385 { 386 return (0 387 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 388 ); 389 } 390 391 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[]) 392 { 393 if (data && data[IFLA_IPVLAN_MODE]) { 394 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 395 396 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX) 397 return -EINVAL; 398 } 399 return 0; 400 } 401 402 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 403 const struct net_device *dev) 404 { 405 struct ipvl_dev *ipvlan = netdev_priv(dev); 406 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 407 int ret = -EINVAL; 408 409 if (!port) 410 goto err; 411 412 ret = -EMSGSIZE; 413 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 414 goto err; 415 416 return 0; 417 418 err: 419 return ret; 420 } 421 422 static int ipvlan_link_new(struct net *src_net, struct net_device *dev, 423 struct nlattr *tb[], struct nlattr *data[]) 424 { 425 struct ipvl_dev *ipvlan = netdev_priv(dev); 426 struct ipvl_port *port; 427 struct net_device *phy_dev; 428 int err; 429 u16 mode = IPVLAN_MODE_L3; 430 431 if (!tb[IFLA_LINK]) 432 return -EINVAL; 433 434 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 435 if (!phy_dev) 436 return -ENODEV; 437 438 if (netif_is_ipvlan(phy_dev)) { 439 struct ipvl_dev *tmp = netdev_priv(phy_dev); 440 441 phy_dev = tmp->phy_dev; 442 } else if (!netif_is_ipvlan_port(phy_dev)) { 443 err = ipvlan_port_create(phy_dev); 444 if (err < 0) 445 return err; 446 } 447 448 if (data && data[IFLA_IPVLAN_MODE]) 449 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 450 451 port = ipvlan_port_get_rtnl(phy_dev); 452 ipvlan->phy_dev = phy_dev; 453 ipvlan->dev = dev; 454 ipvlan->port = port; 455 ipvlan->sfeatures = IPVLAN_FEATURES; 456 ipvlan_adjust_mtu(ipvlan, phy_dev); 457 INIT_LIST_HEAD(&ipvlan->addrs); 458 459 /* TODO Probably put random address here to be presented to the 460 * world but keep using the physical-dev address for the outgoing 461 * packets. 462 */ 463 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 464 465 dev->priv_flags |= IFF_IPVLAN_SLAVE; 466 467 err = register_netdevice(dev); 468 if (err < 0) 469 return err; 470 471 err = netdev_upper_dev_link(phy_dev, dev); 472 if (err) { 473 unregister_netdevice(dev); 474 return err; 475 } 476 477 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 478 ipvlan_set_port_mode(port, mode); 479 480 netif_stacked_transfer_operstate(phy_dev, dev); 481 return 0; 482 } 483 484 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 485 { 486 struct ipvl_dev *ipvlan = netdev_priv(dev); 487 struct ipvl_addr *addr, *next; 488 489 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 490 ipvlan_ht_addr_del(addr); 491 list_del(&addr->anode); 492 kfree_rcu(addr, rcu); 493 } 494 495 list_del_rcu(&ipvlan->pnode); 496 unregister_netdevice_queue(dev, head); 497 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 498 } 499 500 static void ipvlan_link_setup(struct net_device *dev) 501 { 502 ether_setup(dev); 503 504 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 505 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 506 dev->netdev_ops = &ipvlan_netdev_ops; 507 dev->destructor = free_netdev; 508 dev->header_ops = &ipvlan_header_ops; 509 dev->ethtool_ops = &ipvlan_ethtool_ops; 510 } 511 512 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 513 { 514 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 515 }; 516 517 static struct rtnl_link_ops ipvlan_link_ops = { 518 .kind = "ipvlan", 519 .priv_size = sizeof(struct ipvl_dev), 520 521 .get_size = ipvlan_nl_getsize, 522 .policy = ipvlan_nl_policy, 523 .validate = ipvlan_nl_validate, 524 .fill_info = ipvlan_nl_fillinfo, 525 .changelink = ipvlan_nl_changelink, 526 .maxtype = IFLA_IPVLAN_MAX, 527 528 .setup = ipvlan_link_setup, 529 .newlink = ipvlan_link_new, 530 .dellink = ipvlan_link_delete, 531 }; 532 533 static int ipvlan_link_register(struct rtnl_link_ops *ops) 534 { 535 return rtnl_link_register(ops); 536 } 537 538 static int ipvlan_device_event(struct notifier_block *unused, 539 unsigned long event, void *ptr) 540 { 541 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 542 struct ipvl_dev *ipvlan, *next; 543 struct ipvl_port *port; 544 LIST_HEAD(lst_kill); 545 546 if (!netif_is_ipvlan_port(dev)) 547 return NOTIFY_DONE; 548 549 port = ipvlan_port_get_rtnl(dev); 550 551 switch (event) { 552 case NETDEV_CHANGE: 553 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 554 netif_stacked_transfer_operstate(ipvlan->phy_dev, 555 ipvlan->dev); 556 break; 557 558 case NETDEV_UNREGISTER: 559 if (dev->reg_state != NETREG_UNREGISTERING) 560 break; 561 562 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, 563 pnode) 564 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 565 &lst_kill); 566 unregister_netdevice_many(&lst_kill); 567 break; 568 569 case NETDEV_FEAT_CHANGE: 570 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 571 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 572 ipvlan->dev->gso_max_size = dev->gso_max_size; 573 ipvlan->dev->gso_max_segs = dev->gso_max_segs; 574 netdev_features_change(ipvlan->dev); 575 } 576 break; 577 578 case NETDEV_CHANGEMTU: 579 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 580 ipvlan_adjust_mtu(ipvlan, dev); 581 break; 582 583 case NETDEV_PRE_TYPE_CHANGE: 584 /* Forbid underlying device to change its type. */ 585 return NOTIFY_BAD; 586 } 587 return NOTIFY_DONE; 588 } 589 590 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 591 { 592 struct ipvl_addr *addr; 593 594 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) { 595 netif_err(ipvlan, ifup, ipvlan->dev, 596 "Failed to add IPv6=%pI6c addr for %s intf\n", 597 ip6_addr, ipvlan->dev->name); 598 return -EINVAL; 599 } 600 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 601 if (!addr) 602 return -ENOMEM; 603 604 addr->master = ipvlan; 605 memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr)); 606 addr->atype = IPVL_IPV6; 607 list_add_tail(&addr->anode, &ipvlan->addrs); 608 609 /* If the interface is not up, the address will be added to the hash 610 * list by ipvlan_open. 611 */ 612 if (netif_running(ipvlan->dev)) 613 ipvlan_ht_addr_add(ipvlan, addr); 614 615 return 0; 616 } 617 618 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 619 { 620 struct ipvl_addr *addr; 621 622 addr = ipvlan_find_addr(ipvlan, ip6_addr, true); 623 if (!addr) 624 return; 625 626 ipvlan_ht_addr_del(addr); 627 list_del(&addr->anode); 628 kfree_rcu(addr, rcu); 629 630 return; 631 } 632 633 static int ipvlan_addr6_event(struct notifier_block *unused, 634 unsigned long event, void *ptr) 635 { 636 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 637 struct net_device *dev = (struct net_device *)if6->idev->dev; 638 struct ipvl_dev *ipvlan = netdev_priv(dev); 639 640 /* FIXME IPv6 autoconf calls us from bh without RTNL */ 641 if (in_softirq()) 642 return NOTIFY_DONE; 643 644 if (!netif_is_ipvlan(dev)) 645 return NOTIFY_DONE; 646 647 if (!ipvlan || !ipvlan->port) 648 return NOTIFY_DONE; 649 650 switch (event) { 651 case NETDEV_UP: 652 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 653 return NOTIFY_BAD; 654 break; 655 656 case NETDEV_DOWN: 657 ipvlan_del_addr6(ipvlan, &if6->addr); 658 break; 659 } 660 661 return NOTIFY_OK; 662 } 663 664 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 665 { 666 struct ipvl_addr *addr; 667 668 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) { 669 netif_err(ipvlan, ifup, ipvlan->dev, 670 "Failed to add IPv4=%pI4 on %s intf.\n", 671 ip4_addr, ipvlan->dev->name); 672 return -EINVAL; 673 } 674 addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL); 675 if (!addr) 676 return -ENOMEM; 677 678 addr->master = ipvlan; 679 memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr)); 680 addr->atype = IPVL_IPV4; 681 list_add_tail(&addr->anode, &ipvlan->addrs); 682 683 /* If the interface is not up, the address will be added to the hash 684 * list by ipvlan_open. 685 */ 686 if (netif_running(ipvlan->dev)) 687 ipvlan_ht_addr_add(ipvlan, addr); 688 689 return 0; 690 } 691 692 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 693 { 694 struct ipvl_addr *addr; 695 696 addr = ipvlan_find_addr(ipvlan, ip4_addr, false); 697 if (!addr) 698 return; 699 700 ipvlan_ht_addr_del(addr); 701 list_del(&addr->anode); 702 kfree_rcu(addr, rcu); 703 704 return; 705 } 706 707 static int ipvlan_addr4_event(struct notifier_block *unused, 708 unsigned long event, void *ptr) 709 { 710 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 711 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 712 struct ipvl_dev *ipvlan = netdev_priv(dev); 713 struct in_addr ip4_addr; 714 715 if (!netif_is_ipvlan(dev)) 716 return NOTIFY_DONE; 717 718 if (!ipvlan || !ipvlan->port) 719 return NOTIFY_DONE; 720 721 switch (event) { 722 case NETDEV_UP: 723 ip4_addr.s_addr = if4->ifa_address; 724 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 725 return NOTIFY_BAD; 726 break; 727 728 case NETDEV_DOWN: 729 ip4_addr.s_addr = if4->ifa_address; 730 ipvlan_del_addr4(ipvlan, &ip4_addr); 731 break; 732 } 733 734 return NOTIFY_OK; 735 } 736 737 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 738 .notifier_call = ipvlan_addr4_event, 739 }; 740 741 static struct notifier_block ipvlan_notifier_block __read_mostly = { 742 .notifier_call = ipvlan_device_event, 743 }; 744 745 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 746 .notifier_call = ipvlan_addr6_event, 747 }; 748 749 static int __init ipvlan_init_module(void) 750 { 751 int err; 752 753 ipvlan_init_secret(); 754 register_netdevice_notifier(&ipvlan_notifier_block); 755 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 756 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 757 758 err = ipvlan_link_register(&ipvlan_link_ops); 759 if (err < 0) 760 goto error; 761 762 return 0; 763 error: 764 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 765 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 766 unregister_netdevice_notifier(&ipvlan_notifier_block); 767 return err; 768 } 769 770 static void __exit ipvlan_cleanup_module(void) 771 { 772 rtnl_link_unregister(&ipvlan_link_ops); 773 unregister_netdevice_notifier(&ipvlan_notifier_block); 774 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 775 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 776 } 777 778 module_init(ipvlan_init_module); 779 module_exit(ipvlan_cleanup_module); 780 781 MODULE_LICENSE("GPL"); 782 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 783 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 784 MODULE_ALIAS_RTNL_LINK("ipvlan"); 785