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