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 /* ipvlan network devices have devices nesting below it and are a special 84 * "super class" of normal network devices; split their locks off into a 85 * separate class since they always nest. 86 */ 87 static struct lock_class_key ipvlan_netdev_xmit_lock_key; 88 static struct lock_class_key ipvlan_netdev_addr_lock_key; 89 90 #define IPVLAN_FEATURES \ 91 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 92 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 93 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 94 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 95 96 #define IPVLAN_STATE_MASK \ 97 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 98 99 static void ipvlan_set_lockdep_class_one(struct net_device *dev, 100 struct netdev_queue *txq, 101 void *_unused) 102 { 103 lockdep_set_class(&txq->_xmit_lock, &ipvlan_netdev_xmit_lock_key); 104 } 105 106 static void ipvlan_set_lockdep_class(struct net_device *dev) 107 { 108 lockdep_set_class(&dev->addr_list_lock, &ipvlan_netdev_addr_lock_key); 109 netdev_for_each_tx_queue(dev, ipvlan_set_lockdep_class_one, NULL); 110 } 111 112 static int ipvlan_init(struct net_device *dev) 113 { 114 struct ipvl_dev *ipvlan = netdev_priv(dev); 115 const struct net_device *phy_dev = ipvlan->phy_dev; 116 117 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 118 (phy_dev->state & IPVLAN_STATE_MASK); 119 dev->features = phy_dev->features & IPVLAN_FEATURES; 120 dev->features |= NETIF_F_LLTX; 121 dev->gso_max_size = phy_dev->gso_max_size; 122 dev->hard_header_len = phy_dev->hard_header_len; 123 124 ipvlan_set_lockdep_class(dev); 125 126 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats); 127 if (!ipvlan->pcpu_stats) 128 return -ENOMEM; 129 130 return 0; 131 } 132 133 static void ipvlan_uninit(struct net_device *dev) 134 { 135 struct ipvl_dev *ipvlan = netdev_priv(dev); 136 struct ipvl_port *port = ipvlan->port; 137 138 free_percpu(ipvlan->pcpu_stats); 139 140 port->count -= 1; 141 if (!port->count) 142 ipvlan_port_destroy(port->dev); 143 } 144 145 static int ipvlan_open(struct net_device *dev) 146 { 147 struct ipvl_dev *ipvlan = netdev_priv(dev); 148 struct net_device *phy_dev = ipvlan->phy_dev; 149 struct ipvl_addr *addr; 150 151 if (ipvlan->port->mode == IPVLAN_MODE_L3) 152 dev->flags |= IFF_NOARP; 153 else 154 dev->flags &= ~IFF_NOARP; 155 156 list_for_each_entry(addr, &ipvlan->addrs, anode) 157 ipvlan_ht_addr_add(ipvlan, addr); 158 159 return dev_uc_add(phy_dev, phy_dev->dev_addr); 160 } 161 162 static int ipvlan_stop(struct net_device *dev) 163 { 164 struct ipvl_dev *ipvlan = netdev_priv(dev); 165 struct net_device *phy_dev = ipvlan->phy_dev; 166 struct ipvl_addr *addr; 167 168 dev_uc_unsync(phy_dev, dev); 169 dev_mc_unsync(phy_dev, dev); 170 171 dev_uc_del(phy_dev, phy_dev->dev_addr); 172 173 list_for_each_entry(addr, &ipvlan->addrs, anode) 174 ipvlan_ht_addr_del(addr); 175 176 return 0; 177 } 178 179 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 180 struct net_device *dev) 181 { 182 const struct ipvl_dev *ipvlan = netdev_priv(dev); 183 int skblen = skb->len; 184 int ret; 185 186 ret = ipvlan_queue_xmit(skb, dev); 187 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 188 struct ipvl_pcpu_stats *pcptr; 189 190 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 191 192 u64_stats_update_begin(&pcptr->syncp); 193 pcptr->tx_pkts++; 194 pcptr->tx_bytes += skblen; 195 u64_stats_update_end(&pcptr->syncp); 196 } else { 197 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 198 } 199 return ret; 200 } 201 202 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 203 netdev_features_t features) 204 { 205 struct ipvl_dev *ipvlan = netdev_priv(dev); 206 207 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 208 } 209 210 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 211 { 212 struct ipvl_dev *ipvlan = netdev_priv(dev); 213 struct net_device *phy_dev = ipvlan->phy_dev; 214 215 if (change & IFF_ALLMULTI) 216 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 217 } 218 219 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 220 { 221 struct ipvl_dev *ipvlan = netdev_priv(dev); 222 223 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 224 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 225 } else { 226 struct netdev_hw_addr *ha; 227 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 228 229 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 230 netdev_for_each_mc_addr(ha, dev) 231 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 232 233 /* Turn-on broadcast bit irrespective of address family, 234 * since broadcast is deferred to a work-queue, hence no 235 * impact on fast-path processing. 236 */ 237 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 238 239 bitmap_copy(ipvlan->mac_filters, mc_filters, 240 IPVLAN_MAC_FILTER_SIZE); 241 } 242 dev_uc_sync(ipvlan->phy_dev, dev); 243 dev_mc_sync(ipvlan->phy_dev, dev); 244 } 245 246 static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev, 247 struct rtnl_link_stats64 *s) 248 { 249 struct ipvl_dev *ipvlan = netdev_priv(dev); 250 251 if (ipvlan->pcpu_stats) { 252 struct ipvl_pcpu_stats *pcptr; 253 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 254 u32 rx_errs = 0, tx_drps = 0; 255 u32 strt; 256 int idx; 257 258 for_each_possible_cpu(idx) { 259 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 260 do { 261 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 262 rx_pkts = pcptr->rx_pkts; 263 rx_bytes = pcptr->rx_bytes; 264 rx_mcast = pcptr->rx_mcast; 265 tx_pkts = pcptr->tx_pkts; 266 tx_bytes = pcptr->tx_bytes; 267 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 268 strt)); 269 270 s->rx_packets += rx_pkts; 271 s->rx_bytes += rx_bytes; 272 s->multicast += rx_mcast; 273 s->tx_packets += tx_pkts; 274 s->tx_bytes += tx_bytes; 275 276 /* u32 values are updated without syncp protection. */ 277 rx_errs += pcptr->rx_errs; 278 tx_drps += pcptr->tx_drps; 279 } 280 s->rx_errors = rx_errs; 281 s->rx_dropped = rx_errs; 282 s->tx_dropped = tx_drps; 283 } 284 return s; 285 } 286 287 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 288 { 289 struct ipvl_dev *ipvlan = netdev_priv(dev); 290 struct net_device *phy_dev = ipvlan->phy_dev; 291 292 return vlan_vid_add(phy_dev, proto, vid); 293 } 294 295 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 296 u16 vid) 297 { 298 struct ipvl_dev *ipvlan = netdev_priv(dev); 299 struct net_device *phy_dev = ipvlan->phy_dev; 300 301 vlan_vid_del(phy_dev, proto, vid); 302 return 0; 303 } 304 305 static int ipvlan_get_iflink(const struct net_device *dev) 306 { 307 struct ipvl_dev *ipvlan = netdev_priv(dev); 308 309 return ipvlan->phy_dev->ifindex; 310 } 311 312 static const struct net_device_ops ipvlan_netdev_ops = { 313 .ndo_init = ipvlan_init, 314 .ndo_uninit = ipvlan_uninit, 315 .ndo_open = ipvlan_open, 316 .ndo_stop = ipvlan_stop, 317 .ndo_start_xmit = ipvlan_start_xmit, 318 .ndo_fix_features = ipvlan_fix_features, 319 .ndo_change_rx_flags = ipvlan_change_rx_flags, 320 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 321 .ndo_get_stats64 = ipvlan_get_stats64, 322 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 323 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 324 .ndo_get_iflink = ipvlan_get_iflink, 325 }; 326 327 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 328 unsigned short type, const void *daddr, 329 const void *saddr, unsigned len) 330 { 331 const struct ipvl_dev *ipvlan = netdev_priv(dev); 332 struct net_device *phy_dev = ipvlan->phy_dev; 333 334 /* TODO Probably use a different field than dev_addr so that the 335 * mac-address on the virtual device is portable and can be carried 336 * while the packets use the mac-addr on the physical device. 337 */ 338 return dev_hard_header(skb, phy_dev, type, daddr, 339 saddr ? : dev->dev_addr, len); 340 } 341 342 static const struct header_ops ipvlan_header_ops = { 343 .create = ipvlan_hard_header, 344 .parse = eth_header_parse, 345 .cache = eth_header_cache, 346 .cache_update = eth_header_cache_update, 347 }; 348 349 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 350 struct ethtool_link_ksettings *cmd) 351 { 352 const struct ipvl_dev *ipvlan = netdev_priv(dev); 353 354 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 355 } 356 357 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 358 struct ethtool_drvinfo *drvinfo) 359 { 360 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 361 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 362 } 363 364 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 365 { 366 const struct ipvl_dev *ipvlan = netdev_priv(dev); 367 368 return ipvlan->msg_enable; 369 } 370 371 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 372 { 373 struct ipvl_dev *ipvlan = netdev_priv(dev); 374 375 ipvlan->msg_enable = value; 376 } 377 378 static const struct ethtool_ops ipvlan_ethtool_ops = { 379 .get_link = ethtool_op_get_link, 380 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 381 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 382 .get_msglevel = ipvlan_ethtool_get_msglevel, 383 .set_msglevel = ipvlan_ethtool_set_msglevel, 384 }; 385 386 static int ipvlan_nl_changelink(struct net_device *dev, 387 struct nlattr *tb[], struct nlattr *data[]) 388 { 389 struct ipvl_dev *ipvlan = netdev_priv(dev); 390 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 391 392 if (data && data[IFLA_IPVLAN_MODE]) { 393 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 394 395 ipvlan_set_port_mode(port, nmode); 396 } 397 return 0; 398 } 399 400 static size_t ipvlan_nl_getsize(const struct net_device *dev) 401 { 402 return (0 403 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 404 ); 405 } 406 407 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[]) 408 { 409 if (data && data[IFLA_IPVLAN_MODE]) { 410 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 411 412 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX) 413 return -EINVAL; 414 } 415 return 0; 416 } 417 418 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 419 const struct net_device *dev) 420 { 421 struct ipvl_dev *ipvlan = netdev_priv(dev); 422 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 423 int ret = -EINVAL; 424 425 if (!port) 426 goto err; 427 428 ret = -EMSGSIZE; 429 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 430 goto err; 431 432 return 0; 433 434 err: 435 return ret; 436 } 437 438 static int ipvlan_link_new(struct net *src_net, struct net_device *dev, 439 struct nlattr *tb[], struct nlattr *data[]) 440 { 441 struct ipvl_dev *ipvlan = netdev_priv(dev); 442 struct ipvl_port *port; 443 struct net_device *phy_dev; 444 int err; 445 u16 mode = IPVLAN_MODE_L3; 446 447 if (!tb[IFLA_LINK]) 448 return -EINVAL; 449 450 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 451 if (!phy_dev) 452 return -ENODEV; 453 454 if (netif_is_ipvlan(phy_dev)) { 455 struct ipvl_dev *tmp = netdev_priv(phy_dev); 456 457 phy_dev = tmp->phy_dev; 458 } else if (!netif_is_ipvlan_port(phy_dev)) { 459 err = ipvlan_port_create(phy_dev); 460 if (err < 0) 461 return err; 462 } 463 464 if (data && data[IFLA_IPVLAN_MODE]) 465 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 466 467 port = ipvlan_port_get_rtnl(phy_dev); 468 ipvlan->phy_dev = phy_dev; 469 ipvlan->dev = dev; 470 ipvlan->port = port; 471 ipvlan->sfeatures = IPVLAN_FEATURES; 472 ipvlan_adjust_mtu(ipvlan, phy_dev); 473 INIT_LIST_HEAD(&ipvlan->addrs); 474 475 /* TODO Probably put random address here to be presented to the 476 * world but keep using the physical-dev address for the outgoing 477 * packets. 478 */ 479 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 480 481 dev->priv_flags |= IFF_IPVLAN_SLAVE; 482 483 port->count += 1; 484 err = register_netdevice(dev); 485 if (err < 0) 486 goto ipvlan_destroy_port; 487 488 err = netdev_upper_dev_link(phy_dev, dev); 489 if (err) 490 goto ipvlan_destroy_port; 491 492 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 493 ipvlan_set_port_mode(port, mode); 494 495 netif_stacked_transfer_operstate(phy_dev, dev); 496 return 0; 497 498 ipvlan_destroy_port: 499 port->count -= 1; 500 if (!port->count) 501 ipvlan_port_destroy(phy_dev); 502 503 return err; 504 } 505 506 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 507 { 508 struct ipvl_dev *ipvlan = netdev_priv(dev); 509 struct ipvl_addr *addr, *next; 510 511 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 512 ipvlan_ht_addr_del(addr); 513 list_del(&addr->anode); 514 kfree_rcu(addr, rcu); 515 } 516 517 list_del_rcu(&ipvlan->pnode); 518 unregister_netdevice_queue(dev, head); 519 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 520 } 521 522 static void ipvlan_link_setup(struct net_device *dev) 523 { 524 ether_setup(dev); 525 526 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 527 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 528 dev->netdev_ops = &ipvlan_netdev_ops; 529 dev->destructor = free_netdev; 530 dev->header_ops = &ipvlan_header_ops; 531 dev->ethtool_ops = &ipvlan_ethtool_ops; 532 } 533 534 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 535 { 536 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 537 }; 538 539 static struct rtnl_link_ops ipvlan_link_ops = { 540 .kind = "ipvlan", 541 .priv_size = sizeof(struct ipvl_dev), 542 543 .get_size = ipvlan_nl_getsize, 544 .policy = ipvlan_nl_policy, 545 .validate = ipvlan_nl_validate, 546 .fill_info = ipvlan_nl_fillinfo, 547 .changelink = ipvlan_nl_changelink, 548 .maxtype = IFLA_IPVLAN_MAX, 549 550 .setup = ipvlan_link_setup, 551 .newlink = ipvlan_link_new, 552 .dellink = ipvlan_link_delete, 553 }; 554 555 static int ipvlan_link_register(struct rtnl_link_ops *ops) 556 { 557 return rtnl_link_register(ops); 558 } 559 560 static int ipvlan_device_event(struct notifier_block *unused, 561 unsigned long event, void *ptr) 562 { 563 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 564 struct ipvl_dev *ipvlan, *next; 565 struct ipvl_port *port; 566 LIST_HEAD(lst_kill); 567 568 if (!netif_is_ipvlan_port(dev)) 569 return NOTIFY_DONE; 570 571 port = ipvlan_port_get_rtnl(dev); 572 573 switch (event) { 574 case NETDEV_CHANGE: 575 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 576 netif_stacked_transfer_operstate(ipvlan->phy_dev, 577 ipvlan->dev); 578 break; 579 580 case NETDEV_UNREGISTER: 581 if (dev->reg_state != NETREG_UNREGISTERING) 582 break; 583 584 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, 585 pnode) 586 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 587 &lst_kill); 588 unregister_netdevice_many(&lst_kill); 589 break; 590 591 case NETDEV_FEAT_CHANGE: 592 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 593 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 594 ipvlan->dev->gso_max_size = dev->gso_max_size; 595 netdev_features_change(ipvlan->dev); 596 } 597 break; 598 599 case NETDEV_CHANGEMTU: 600 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 601 ipvlan_adjust_mtu(ipvlan, dev); 602 break; 603 604 case NETDEV_PRE_TYPE_CHANGE: 605 /* Forbid underlying device to change its type. */ 606 return NOTIFY_BAD; 607 } 608 return NOTIFY_DONE; 609 } 610 611 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 612 { 613 struct ipvl_addr *addr; 614 615 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) { 616 netif_err(ipvlan, ifup, ipvlan->dev, 617 "Failed to add IPv6=%pI6c addr for %s intf\n", 618 ip6_addr, ipvlan->dev->name); 619 return -EINVAL; 620 } 621 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 622 if (!addr) 623 return -ENOMEM; 624 625 addr->master = ipvlan; 626 memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr)); 627 addr->atype = IPVL_IPV6; 628 list_add_tail(&addr->anode, &ipvlan->addrs); 629 630 /* If the interface is not up, the address will be added to the hash 631 * list by ipvlan_open. 632 */ 633 if (netif_running(ipvlan->dev)) 634 ipvlan_ht_addr_add(ipvlan, addr); 635 636 return 0; 637 } 638 639 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 640 { 641 struct ipvl_addr *addr; 642 643 addr = ipvlan_find_addr(ipvlan, ip6_addr, true); 644 if (!addr) 645 return; 646 647 ipvlan_ht_addr_del(addr); 648 list_del(&addr->anode); 649 kfree_rcu(addr, rcu); 650 651 return; 652 } 653 654 static int ipvlan_addr6_event(struct notifier_block *unused, 655 unsigned long event, void *ptr) 656 { 657 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 658 struct net_device *dev = (struct net_device *)if6->idev->dev; 659 struct ipvl_dev *ipvlan = netdev_priv(dev); 660 661 /* FIXME IPv6 autoconf calls us from bh without RTNL */ 662 if (in_softirq()) 663 return NOTIFY_DONE; 664 665 if (!netif_is_ipvlan(dev)) 666 return NOTIFY_DONE; 667 668 if (!ipvlan || !ipvlan->port) 669 return NOTIFY_DONE; 670 671 switch (event) { 672 case NETDEV_UP: 673 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 674 return NOTIFY_BAD; 675 break; 676 677 case NETDEV_DOWN: 678 ipvlan_del_addr6(ipvlan, &if6->addr); 679 break; 680 } 681 682 return NOTIFY_OK; 683 } 684 685 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 686 { 687 struct ipvl_addr *addr; 688 689 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) { 690 netif_err(ipvlan, ifup, ipvlan->dev, 691 "Failed to add IPv4=%pI4 on %s intf.\n", 692 ip4_addr, ipvlan->dev->name); 693 return -EINVAL; 694 } 695 addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL); 696 if (!addr) 697 return -ENOMEM; 698 699 addr->master = ipvlan; 700 memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr)); 701 addr->atype = IPVL_IPV4; 702 list_add_tail(&addr->anode, &ipvlan->addrs); 703 704 /* If the interface is not up, the address will be added to the hash 705 * list by ipvlan_open. 706 */ 707 if (netif_running(ipvlan->dev)) 708 ipvlan_ht_addr_add(ipvlan, addr); 709 710 return 0; 711 } 712 713 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 714 { 715 struct ipvl_addr *addr; 716 717 addr = ipvlan_find_addr(ipvlan, ip4_addr, false); 718 if (!addr) 719 return; 720 721 ipvlan_ht_addr_del(addr); 722 list_del(&addr->anode); 723 kfree_rcu(addr, rcu); 724 725 return; 726 } 727 728 static int ipvlan_addr4_event(struct notifier_block *unused, 729 unsigned long event, void *ptr) 730 { 731 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 732 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 733 struct ipvl_dev *ipvlan = netdev_priv(dev); 734 struct in_addr ip4_addr; 735 736 if (!netif_is_ipvlan(dev)) 737 return NOTIFY_DONE; 738 739 if (!ipvlan || !ipvlan->port) 740 return NOTIFY_DONE; 741 742 switch (event) { 743 case NETDEV_UP: 744 ip4_addr.s_addr = if4->ifa_address; 745 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 746 return NOTIFY_BAD; 747 break; 748 749 case NETDEV_DOWN: 750 ip4_addr.s_addr = if4->ifa_address; 751 ipvlan_del_addr4(ipvlan, &ip4_addr); 752 break; 753 } 754 755 return NOTIFY_OK; 756 } 757 758 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 759 .notifier_call = ipvlan_addr4_event, 760 }; 761 762 static struct notifier_block ipvlan_notifier_block __read_mostly = { 763 .notifier_call = ipvlan_device_event, 764 }; 765 766 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 767 .notifier_call = ipvlan_addr6_event, 768 }; 769 770 static int __init ipvlan_init_module(void) 771 { 772 int err; 773 774 ipvlan_init_secret(); 775 register_netdevice_notifier(&ipvlan_notifier_block); 776 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 777 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 778 779 err = ipvlan_link_register(&ipvlan_link_ops); 780 if (err < 0) 781 goto error; 782 783 return 0; 784 error: 785 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 786 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 787 unregister_netdevice_notifier(&ipvlan_notifier_block); 788 return err; 789 } 790 791 static void __exit ipvlan_cleanup_module(void) 792 { 793 rtnl_link_unregister(&ipvlan_link_ops); 794 unregister_netdevice_notifier(&ipvlan_notifier_block); 795 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 796 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 797 } 798 799 module_init(ipvlan_init_module); 800 module_exit(ipvlan_cleanup_module); 801 802 MODULE_LICENSE("GPL"); 803 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 804 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 805 MODULE_ALIAS_RTNL_LINK("ipvlan"); 806